Patent Publication Number: US-2017360598-A1

Title: Configurable convective device

Description:
TECHNICAL FIELD 
     The present disclosure relates to convective devices having pneumatic structures and accessories to be used with the convective devices, and garments with convective devices. 
     SUMMARY 
     At least some aspects of the present disclosure feature a configurable convective device, comprising: a flexible first layer having air permeable surface; a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge, wherein the pneumatic structure comprises a first portion, a second portion, and an inflatable channel connecting the first portion and the second portion; at least one opening into the pneumatic structure; and an air-guide device disposed between the first portion and the second portion, The air-guide device is configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent. 
     At least some aspects of the present disclosure feature a configurable convective device, comprising: a flexible first layer having air permeable surface; a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge; at least one opening into the pneumatic structure; a separation device disposed proximate to the first edge and adapted to separate a part of the pneumatic structure to a first portion and a second portion, comprising: an enclosure seal extending from the first edge toward the second edge; and a separation element within the enclosure seal; and an air-guide device disposed proximate to the second edge and between the first portion and the second portion, the air-guide device configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent. 
     At least some aspects of the present disclosure feature an inflatable upper body blanket, comprising: a flexible first layer having air permeable surface; a flexible second layer joining the first layer by a periphery seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge, wherein the pneumatic structure comprises a first portion, a second portion, and an inflatable channel connecting the first portion and the second portion; at least one opening into the pneumatic structure; and an air-guide device disposed between the first portion and the second portion, the air-guide device configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, explain the advantages and principles of the invention. In the drawings, 
         FIG. 1A  is a top plane view of one embodiment of a convective device having separation device and optional air-guide device; 
         FIG. 1B  shows a top plane view of a reconfiguration of the embodiment illustrated in  FIG. 1A  after two portions are partially separated; 
         FIG. 1C  is a close-up view of the convective device illustrated in  FIG. 1A  when it is inflated and bent; 
         FIG. 2A  is a top plane view of one embodiment of a convective device having separation device and optional air-guiding element; 
         FIG. 2B  shows a top plane view of a reconfiguration of the embodiment illustrated in  FIG. 2A  after two portions are partially separated; 
         FIG. 2C  is a close-up view of a convective device similar to the one illustrated in  FIG. 2A  when it is inflated and bent; 
         FIGS. 3A-3L  illustrate various examples of configurable convective devices; 
         FIGS. 4A-4H  illustrate some examples of air-guide devices; 
         FIG. 5A  illustrates a perspective view of one embodiment of a hose clamp; 
         FIG. 5B  illustrates a side view of the hose clamp illustrated in  FIG. 5A ; 
         FIG. 5C  illustrates another example of a hose clamp; 
         FIG. 6A  is a flattened view of a hose clamp toward the inner surface of an encircling element; 
         FIG. 6B  is a perspective view of the hose clamp illustrated in  FIG. 6A ; 
         FIG. 6C  is a side view of the hose clamp illustrated in  FIG. 6A ; 
         FIGS. 6D-6G  illustrate some example configurations of engaging components; 
         FIG. 7  illustrates one embodiment of a system for controlling temperature using a convective device and a hose clamp to maintain hose connection; 
         FIG. 8  illustrates one embodiment of a gown with a convective device; and 
         FIG. 9  illustrates an example flow diagram of using a configurable convective device. 
     
    
    
     In the drawings, like reference numerals indicate like elements. While the above-identified drawing, which may not be drawn to scale, sets forth various embodiments of the present disclosure, other embodiments are also contemplated, as noted in the Detailed Description. In all cases, this disclosure describes the presently disclosed disclosure by way of representation of exemplary embodiments and not by express limitations. It should be understood that numerous other modifications and embodiments can be devised by those skilled in the art, which fall within the scope and spirit of this disclosure. 
     DETAILED DESCRIPTION 
     Unless otherwise indicated, all numbers expressing feature sizes, amounts, and physical properties used in the specification and claims are to be understood as being modified in all instances by the term “about.” Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by those skilled in the art utilizing the teachings disclosed herein. The use of numerical ranges by endpoints includes all numbers within that range (e.g. 1 to 5 includes 1, 1.5, 2, 2.75, 3, 3.80, 4, and 5) and any range within that range. 
     As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” encompass embodiments having plural referents, unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise. 
     Convective devices generally refer to a device distributing matter in gas state. For example, convective devices can receive a stream of pressurized, warmed air, inflate in response to the pressurized air, distribute the warmed air within a pneumatic structure, and emit the warmed air onto a body to accomplish such objectives as increasing comfort, reducing shivering, and treating or preventing hypothermia. In some embodiments, a convective device has a pneumatic structure that is formed by two layers, each layer including one or more sheets, and at least one of the layers is air permeable that allows air distribution. As used herein, “inflatable” refers to a structure which increases in volume when air or other gas is supplied at a pressure greater than atmospheric pressure to the interior of the structure. Typically these structures inflate at relatively low pressures such as pressures less than 100 mmHg, preferably at pressures less than 50 mmHg, more preferably at pressures less than 25 mmHg. In some cases, the volume of the inflatable section can increase by greater than 100%. 
     At least some embodiments of the present disclosure direct to a convective device with features facilitating reconfiguration and transformation, for example, a portion of the convective device is bent. Typically, the pneumatic structure in the convective device is kinked or pinched off proximate to the bending area when a portion is bent. In some embodiments, the convective device includes an air-guide device disposed in the pneumatic structure adapted to direct inflation medium to reduce pressure drop of the inflation medium at the bending area. As used herein, “in” is used to describe a spatial relationship of generally in the structure including at the edge of the structure. For example, the convective device can include the air-guide device to help form one or more crease(s) when it is inflated, proximate to the air-guide device. In some cases, the convective device includes a separation device adapted to separate the pneumatic structure into two portions, where the two portions can be arranged into a different relative position from the original relative position. For example, the two portions generally extend along the same line as the original configuration; and the two portions can be partially separated and each portion can be bent about 90 degree from its original position such that the two portions become generally parallel. 
     At least some embodiments of the present disclosure direct to a hose clamp designed to be used with a convective device and a hose to improve air-tight connection and prevent slipping. In some embodiments, the hose clamp includes an encircling element matching the diameter of the hose and a grabbing component to facilitate user operation. In some cases, the hose clamp includes an engaging component disposed on the inner surface of the encircling element to improve gripping power of the hose clamp. The engaging component can include, for example, a plurality of engaging elements, bumps, raise-ups, or the like. In some implementations, the engaging elements are disposed in a pattern on the inner surface of the encircling element. In some cases, at least some of the engaging elements are disposed proximate to one end or both ends of the encircling element. 
       FIG. 1A  is a top plane view of one embodiment of a convective device  100  having separation device and optional air-guiding element;  FIG. 1B  shows a top plane view of a reconfiguration of the embodiment illustrated in  FIG. 1A  after two portions are partially separated; and  FIG. 1C  is a close-up view of the convective device  100  illustrated in  FIG. 1A  when it is inflated and bent. In this embodiment, the convective device  100  has a flexible first layer  107 , a flexible second layer (not illustrated), an opening  130 , an optional separation device  110 , and an optional air-guide device  120 . In some cases, the flexible first layer  107  has air permeable surface. The flexible second layer joining the first layer by a periphery seal  106  around a common periphery to form a pneumatic structure  140 , where the pneumatic structure  140  has a first edge  141  and an opposing second edge  142 . The pneumatic structure  140  has a first portion  143 , a second portion  144 , and an inflatable channel  145  connecting the first portion  143  and the second portion  144 , where the first portion and the second portion are generally extending along a same line as illustrated in  FIG. 1A . In some cases, the convective device  100  can be used as an upper body blanket suitable to cover the upper body of a person with arms extending in a clinical position in its original configuration. In such cases, the convective device  100  can be rearranged to form a lower body blanket to cover the lower body of a person, for example. 
     In some embodiments, the convective device  100  includes at least one opening  130  into the pneumatic structure  140 . The opening  130  can be in any form that allows an inflation medium source (not illustrated) to connect and provide inflation medium to inflate the pneumatic structure  140 , for example, a sleeve opening at the edge as illustrated in  FIG. 1A . As other examples, the opening  130  can include one or more inlet ports, cuffs, ports with a rigid collar, sleeve openings at the edge, or the like. 
     In some embodiments, the separation device  110  is disposed proximate to the first edge  141  of the pneumatic structure  140 . In some cases, the separation device includes an enclosure seal  112  extending from the first edge  141  toward the second edge  142  and a separation element  114  within the enclosure seal  112 . The separation device  110  is adapted to separate the pneumatic structure into the first portion  143  and the second portion  144 , such that the two portions can be rearranged and bent. The first portion  143  has a longitudinal axis  103  along a direction  103 A and the second portion  144  has a longitudinal axis  105  along a direction  105 A when the two portions are attached. In some cases, at least a portion of the enclosure seal  112  is generally perpendicular to the first edge. The enclosure seal  112  can be in the shape of, for example, a line, a curve, a T shape, a continuous closed shape (e.g., a rectangular shape, an oval shape, etc.), or the like. In some cases, the separation element  114  comprises at least one of a line of weakness, perforation, slit, opening, hook and loop, adhesive strip, or the like. The separation element  114  can be in a shape of, for example, line, wedge, triangular, rectangle, elliptical, curved, or the like. In some cases, the separation element  114  is a connected element to be torn open when the convective device  110  is rearranged. In some cases, the separation element includes only slim opening(s), for example, the maximum width of the opening is smaller than 2 cm. In some cases, the pneumatic structure  140  has an average length L between the first edge  141  and the second edge  142  and the length of the separation device  110  is equal to or greater than one-half of the average length L of the pneumatic structure  140 . 
     In some cases, the air-guide device  120  is disposed proximate to the second edge  142  of the pneumatic structure  140  and between the first portion  143  and the second portion  144 , which is adapted to direct flow of inflation medium between the two portions, especially when the first portion  143  and/or the second portion  144  are bent. In some cases, the air-guide device  120  is disposed in the inflatable channel  145  connecting the first portion  143  and the second portion  144 . As used herein, “in an inflatable channel” or “within an inflatable channel” includes partially within the inflatable channel. In some cases, the air-guide device  120  is configured to facilitate forming creases at the edge of the air-guide device when the configurable convective device  100  is inflated and at least one of the first portion and the second portion are rearranged such that part of the convective device  100  is bent (e.g., as illustrated in  FIG. 1C ). The pneumatic structure  140  has a width W and the second edge  142  has a first end  142 A and a second end  142 B. 
     In some cases, the air-guide device  120  is disposed at a center portion of the pneumatic structure that has a starting point at a distance of ¼ of the width from the first end  142 A and an ending point at a distance of ¼ of the width from the second end  142 B. In some cases, the air-guide device  120  is disposed at a center portion of the pneumatic structure that has a starting point at a distance of ⅖ of the width from the first end  142 A and an ending point at a distance of ⅖ of the width from the second end  142 B. In some cases, the air-guide device  120  is disposed at the portion of the inflatable channel  145  that is closer to the second edge  142  and further away from the first edge  141 . In some embodiments, the air-guide device  120  comprises a guiding seal extending from the second edge  142  and toward the pneumatic structure  140 . In the embodiment as illustrated, the air-guide device  120  comprises two guiding seals  121  and  122 , each guiding seal extending from the second edge  142  and toward the pneumatic structure  140 . In some cases, the two guiding seals ( 121 ,  122 ) are directed to a different portion (the first portion  143  or the second portion  144 ) of the pneumatic structure  140 . In some cases, the two guiding seals ( 121 ,  122 ) are generally perpendicular with each other. 
       FIG. 1B  illustrates how the first portion  143  and the second portion  144  of the pneumatic structure  140  can be rearranged after they are partially separated. In some cases, the first portion  143  can be turned in an angle  13  between 0° and 90°, such that its longitudinal axis  103  is along a direction  103 B having the angle  13  from the direction  103 A. Similarly, the second portion  144  can be turned in an angle  15  between 0° and 90°, such that its longitudinal axis  105  is along a direction  105 B having the angle  15  from the direction  105 A. When both the first portion  143  and the second portion  144  are bent approximately 90°, the first portion  143  and the second portion  144  are arranged to be generally parallel with one another. 
       FIG. 1C  shows close-up view of the convective device  100  illustrated in  FIG. 1A  when it is inflated and bent. The first portion  143  and the second portion  144  are rearranged in a position that the two portions are close to each other and part of the convective device  100  is bent. In the embodiment illustrated, the air-guide device  120  facilitate the formation of one or more creases  121 C along the guiding seal  121  and one or more creases  122 C along the guiding seal  122  such that the flow rate of inflation medium is reduced in the bending region but not greatly reduced. In some cases, the air-guide device  120  facilitate forming one or more crease(s) where the convective device  100  is bent when the convective device  100  is inflated to reduce kinking effect and air pressure drop. 
     Each of the first layer  107  and the second layer may include one or more sheets, where each sheet may be formed from a different material. In some implementations, the first layer  107  and/or the second layer may include an underside sheet formed from a flexible, fibrous, preferably non-woven structure composed of polymeric materials capable of bonding to an upper side sheet of a heat-sealable polymeric material. For example, the underside sheet may be a non-woven, hydroentangled polyester material and the upper side layer may include a polyolefin such as a polypropylene film which is extrusion-coated, thermally laminated, or adhesively laminated onto the polyester layer. Alternatively, the underside sheet may comprise a non-woven, paper-based material to which the upper side layer, including either a polyethylene or polypropylene film, has been glue laminated. In one embodiment, the upper side and underside sheets can be made with a stratum of absorbent tissue paper prelaminated with a layer of heat-sealable plastic. In some cases, both the first layer and the second layer can include a same polymer material. 
     In some embodiments, the second layer includes the upper side sheet and the underside sheet, and the first layer  107  comprises the same material as the upper side sheet of the second layer. The first layer  107  thus may include a sheet of plastic bonded to the plastic upper side of the second layer. It is preferably attached by a continuously-running web process including stations that provide an interruptible heat-sealing process. This interruptible heat sealing process can be controlled to form elongated heat seals  108  that define the inflatable channels therebetween. The seals  108  can be formed as continuous air impervious seals or discontinuous air permeable seals. The interruptible heat sealing process can be used to form the continuous seams, one of which is the seam  106  at the peripheral of the second layer and the first layer  107 . In some cases, the interruptible heat sealing process can be used to form the discontinuous heat seals  108 . In some cases, absorbent material can be applied to the convective device  100 , for example, applied as a single material layer. The absorbent material can be bonded to the upper plastic layer by heat processing or by adhesive bonding. 
     In some embodiments, the convective device  100  is enabled to bathe a patient in the thermally controlled inflation medium introduced into the convective device  100 , when inflated, via an air permeable layer, the first layer and/or the second layer. A layer can be air permeable using various materials or mechanical structures, for example, air-permeable materials, apertures, interstices, slits, or the like. In some implementations of an air permeable sheet with apertures, the density of apertures can vary among areas and/or inflatable sections. 
     In some embodiments, the first layer  107  and/or the second layer are made from a polyolefin non-woven extrusion coated, each with a coating of polypropylene on one side. In some other embodiments, the first layer  107  and/or the second layer can be poly lactic acid spunbond with polyolefin based extrusion coat. One of the first layer  107  and second layer may have holes formed by punching, slitting, or cutting to permit the flow of pressurized inflation medium from the inflated section through the layer. In some cases, the holes can be opened through both layers. In some cases, when the convective device  100  is assembled, the polypropylene-coated side of the first layer  107  is sealed to the polypropylene-coated side of the second layer at the periphery  106 , and at the one or more locations  108  to form the construction. The sealing process can use various techniques, for example, ultrasonic welding, radio frequency welding, heat sealing, or the like. Alternatively, the first layer  107  and second layer may each include a laminate of polypropylene and polyolefin web with holes formed in at least one of the layers to support passage of pressurized air. In yet another embodiment, at least one of the layers can use air permeable material, for example, spunbond-meltblown-spunbond (SMS) nonwoven material, or the like. 
       FIG. 2A  is a top plane view of one embodiment of a convective device  200  having separation device and optional air-guiding element;  FIG. 2B  shows a top plane view of a reconfiguration of the embodiment illustrated in  FIG. 2A  after two portions are partially separated; and  FIG. 2C  is a close-up view of a convective device similar to the one illustrated in  FIG. 2A  when it is inflated and bent. In this embodiment, the convective device  200  has a first layer  207 , a flexible second layer (not illustrated), an opening  230 , an optional separation device  210 , and an optional air-guide device  220 . In some cases, the flexible first layer  207  has air permeable surface. The flexible second layer joining the first layer by a seal  206  around a common periphery to form a pneumatic structure  240 , where the pneumatic structure  240  has a first edge  241  and an opposing second edge  242 . The pneumatic structure  240  has a first portion  243 , a second portion  244 , and an inflatable channel  245  connecting the first portion  243  and the second portion  244 , where the first portion  243  and the second portion  244  are generally parallel with one another as illustrated in  FIG. 2A . In some cases, the convective device  200  is an inflatable lower body blanket, upper body blanket, or full body blanket. The components illustrated in  FIGS. 2A-2C  in can have the same or similar elements, compositions, configurations and features as the corresponding components illustrated in  FIGS. 1A-1C . 
     In some embodiments, the convective device  200  includes at least one opening  230  into the pneumatic structure  240 . The opening  230  can be in any form that allows an inflation medium source (not illustrated) to connect and provide inflation medium to inflate the pneumatic structure  240 , for example, an inlet port as illustrated in  FIG. 2A . As other examples, the opening  230  can include one or more inlet ports, cuffs, sleeve openings at the edge, or the like. 
     In some embodiments, the separation device  210  is disposed proximate to the first edge  241  of the pneumatic structure  240 . In some cases, the separation device includes an enclosure seal  212  extending from the first edge  241  toward the second edge  242  and a separation element  214  within the enclosure seal  212 . The separation device  210  is adapted to separate a part of the pneumatic structure into the two portion ( 243 ,  244 ) such that the relative position of two portions can be rearranged. The first portion  243  has a longitudinal axis  203  along a direction  203 A and the second portion  244  has a longitudinal axis  205  along a direction  205 A when the two portions are attached. In some cases, at least a portion of the enclosure seal  212  is generally perpendicular to the first edge. The enclosure seal  212  can be in, for example, a line, a curve, a continuous closed shape (e.g., a rectangular shape, an oval shape, etc.), or the like. The separation element  214  comprises at least one of a line of weakness, perforation, and slit. 
     In some cases, the air-guide device  220  is disposed proximate to the second edge  242  of the pneumatic structure  240  and between the first portion  243  and the second portion  244 , which is adapted to direct flow of inflation medium between the two portions, especially when one or both of the two portions are bent. In some cases, the air-guide device  220  is disposed between the first portion  243  and the second portion  244 . In some cases, the air-guide device  220  is configured to facilitate forming creases at the edge of the air-guide device when the configurable convective device  200  is inflated and at least one of the first portion and the second portion are rearranged such that part of the convective device  200  is bent (e.g., as illustrated in  FIG. 2C ). In some embodiments, the air-guide device  220  comprises a guiding seal extending from the second edge  242  and toward the pneumatic structure  240 . In the embodiment as illustrated, the air-guide device  220  comprises two guiding seals  221  and  222 , each guiding seal extending from the second edge  242  and toward the pneumatic structure  240 . In some cases, the two guiding seals ( 221 ,  222 ) are directed to a different portion (the first portion  243  or the second portion  244 ) of the pneumatic structure  240 . In some cases, the two guiding seals ( 221 ,  222 ) are generally perpendicular with each other. 
       FIG. 2B  illustrates how the first portion  243  and the second portion  244  of the pneumatic structure  240  can be rearranged after they are partially separated. In some cases. the first portion  243  can be turned in an angle  23  between 0° and 90°, such that its longitudinal axis  203  is along a direction  203 B having the angle  23  from the direction  203 A. Similarly, the second portion  244  can be turned in an angle  25  between 0° and 90°, such that its longitudinal axis  205  is along a direction  205 B having the angle  25  from the direction  205 A. When both the first portion  243  and the second portion  244  are turned in proximately 90° the first portion  243  and the second portion  244  are arranged to be generally extending along a same line. For example, the convective device  200  can be used as a lower body blanket to cover a person&#39;s legs and abdomen in its original configuration and be rearranged to be used as an upper body blanket to cover chest and extended arms. 
       FIG. 2C  is a close-up view of a convective device  200 C similar to the one illustrated in  FIG. 2A  when it is inflated and bent. The convective device  200 C includes a periphery seal  206 , seals  208  to create inflatable channels, a first portion  243  and a second portion originally arranged parallel, and an air-guide device  220 C that is a wavy seal. In the embodiment illustrated, the first portion  243  and the second portion  244  are rearranged to generally extending from each other and the pneumatic structure  240  has creases  222 C formed along the air-guide device  220 C, such that the flow rate of inflation medium is generally uniformed within the pneumatic structure, for example, the flow rate is reduced in the bending region but not greatly reduced. In some cases, the air-guide device  220 C facilitate forming one or more crease(s)  222 C where the convective device  200 C is bent when the convective device  200 C is inflated to reduce kinking effect and pressure drop. 
       FIGS. 3A-3L  illustrate various examples of configurable convective devices. The components in the examples illustrated in  FIGS. 3A-3L  can have the same or similar elements, compositions, configurations and features as the corresponding components illustrated in  FIGS. 1A-2C .  FIG. 3A  is a top plane view of one embodiment of a convective device  300 A having an optional separation device and optional air-guiding element; and  FIG. 3B  shows a top plane view of a reconfiguration of the embodiment illustrated in  FIG. 3A  after two portions are partially separated. In this embodiment, the convective device  300 A has a flexible first layer  307 A, a flexible second layer (not illustrated), an opening  330 A, an optional separation device  310 A, and an optional air-guide device  320 A. In some cases, the flexible first layer  307 A has air permeable surface. The flexible second layer joining the first layer by a seal  306 A around a common periphery to form a pneumatic structure  340 A and seals  308 A to form inflatable channels, where the pneumatic structure  340 A has a first edge  341 A and an opposing second edge  342 A. The pneumatic structure  340 A has a first portion  343 A, a second portion  344 A, and an inflatable channel  345 A connecting the first portion  343 A and the second portion  344 A. In some cases, the convective device  300 A can be used as an upper body blanket suitable to cover the upper body of a person with arms extending in a clinical position. 
     In some embodiments, the convective device  300 A includes at least one opening  330 A into the pneumatic structure  340 A. The opening  330 A can be in any form that allows an inflation medium source (not illustrated) to connect and provide inflation medium to inflate the pneumatic structure  340 A, for example, a sleeve opening at the edge as illustrated in  FIG. 3A . As other examples, the opening  330 A can include one or more inlet ports, cuffs, sleeve openings at the edge, or the like. 
     In some embodiments, the separation device  310 A is disposed proximate to the first edge  341 A of the pneumatic structure  340 A. In some cases, the separation device  310 A includes an enclosure seal  312 A and an enclosure seal  316 A extending from the first edge  341 A toward the second edge  342 A, where a separation element  314 A is within the enclosure seal  312 A and a separation element  318 A within the enclosure seal  316 A. The separation device  310 A is adapted to partially separate the pneumatic structure into the two portions ( 343 A,  344 A) such that the relative position of the two portions can be rearranged. The first portion  343 A has a longitudinal axis  302 A along a direction  303 A and the second portion  344 A has a longitudinal axis  304 A along a direction  305 A when the two portions are in the original position. In the example as illustrated, the enclosure seal  312 A and the enclosure seal  314 A are both in curve shapes. The enclosure seal  312 A and/or the enclosure seal  314 A can be in, for example, a line, a curve, a continuous closed shape (e.g., a rectangular shape, an oval shape, etc.), or the like. The separation element  314 A and/or the separation element  318 A comprises at least one of a line of weakness, perforation, and slit. In some cases, the length of the separation device  310 A is more than half of the length between the first edge  341 A and the second edge  342 A. 
     In some cases, the air-guide device  320 A is disposed proximate to the second edge  342 A of the pneumatic structure  340 A and adapted to direct flow of inflation medium. In some cases, the air-guide device  320 A is disposed between the first portion  343 A and the second portion  344 A. In its original configuration, the first portion  343 A is disposed along a direction  303 A and the second portion  344 A is disposed along a direction  305 A, where both  303 A and  305 B are along the convective device&#39;s longitudinal axis. In some embodiments, the air-guide device  320 A comprises a guiding seal extending from the second edge  342 A and toward the pneumatic structure  340 A. In the embodiment as illustrated, the air-guide device  320 A comprises two guiding seals  321 A and  322 A, each guiding seal extending from the second edge  342 A and toward the pneumatic structure  340 A. In some cases, the two guiding seals ( 321 A,  322 A) are directed to a different portion (the first portion  343 A or the second portion  344 A) of the pneumatic structure  340 A. In some cases, the two guiding seals ( 321 A,  322 A) are generally perpendicular with each other. 
       FIG. 3B  illustrates how the first portion  343 A and the second portion  344 A of the pneumatic structure  340 A can be rearranged after they are partially separated. In some cases, the first portion  343 A can be turned in an angle  33 A between 0° and 90°, such that the first portion  343 A is along a direction  303 B having the angle  33 A from the its original direction  303 A. Similarly, the second portion  344 A can be turned in an angle  35 A between 0° and 90°, such that the second portion  344 A is along a direction  305 B having the angle  35 A from its original direction  305 A. When both the first portion  343 A and the second portion  344 A are turned in proximately 90° the first portion  343 A and the second portion  344 A are arranged to be generally parallel with one another. 
       FIG. 3C  is a top plane view of one embodiment of a convective device  300 C having an optional separation device and optional air-guiding element; and  FIG. 3D  shows a top view of a reconfiguration of the example illustrated in  FIG. 3C  after two portions are partially separated. In this embodiment, the convective device  300 C has a flexible first layer  307 C, a flexible second layer (not illustrated), an opening  330 C, an optional separation device  310 C, and an optional air-guide device  320 C. In some cases, the flexible first layer  307 C has air permeable surface. The flexible second layer joining the first layer by a seal  306 C around a common periphery to form a pneumatic structure  340 C and seals  308 C to form inflatable channels, where the pneumatic structure  340 C has a first edge  341 C, a second edge  342 C oppose to the first edge  341 C, and two side edges ( 345 C,  346 C). The pneumatic structure  340 C has a first portion  343 C, a second portion  344 C, and an inflatable channel  345 C connecting the first portion  343 C and the second portion  344 C. In some cases, the convective device  300 C is an inflatable blanket generally in a generally rectangular shape. In some cases, the convective device  300 C can be used as a lower body blanket suitable to cover the lower body of a person. 
     In some embodiments, the convective device  300 C includes at least one opening  330 C into the pneumatic structure  340 C. The opening  330 C can be in any form that allows an inflation medium source (not illustrated) to connect and provide inflation medium to inflate the pneumatic structure  340 C, for example, an inlet port with a rigid collar around the port as illustrated in  FIG. 3C . As other examples, the opening  330 C can include one or more inlet ports, cuffs, sleeve openings at the edge, or the like. 
     In some embodiments, the separation device  310 C is disposed proximate to the first edge  341 C of the pneumatic structure  340 C. In some cases, the separation device includes an enclosure seal  312 C extending from the first edge  341 C toward the second edge  342 C, where a separation element  314 C is within the enclosure seal  312 C, where the separation element  314 C has two extensions ( 316 C,  318 C) toward the respective side edges ( 345 C,  346 C). In the example illustrated, the extensions ( 316 C,  318 C) can be a straight line, a curved line, a slit, or the like. The separation device  310 C is adapted to partially separate the pneumatic structure into the two portions ( 343 C,  344 C) such that the relative position of the two portions can be rearranged. In the example as illustrated, the enclosure seal  312 C is generally in a T shape. The enclosure seal  312 C can be in a shape of, for example, a line, a curve, a continuous closed shape (e.g., a rectangular shape, an oval shape, etc.), or the like. The separation element  314 C comprises at least one of a line of weakness, perforation, slit, hook and loop, adhesive strip, or the like. In some cases, the longitudinal length of the separation device  310 C is more than half of the length between the first edge  341 C and the second edge  342 C. 
     In some cases, the air-guide device  320 C is disposed proximate to the second edge  342 C of the pneumatic structure  340 C and adapted to direct flow of inflation medium. In some cases, the air-guide device  320 C is disposed within the inflatable channel  345 C connecting the first portion  343 C and the second portion  344 C. In some embodiments, the air-guide device  320 C comprises two guiding seals  321 C and  322 C, where each guiding seal ( 321 C,  322 C) is wavy connecting second edge  342 C to a respective side edge ( 345 C,  346 C). In the embodiment as illustrated, the air-guide device  320 C further comprises two wavy guiding seals  323 C and  324 C, opposing to the two guiding seals ( 321 C,  322 C) respectively. In this example, the guiding seals ( 321 C,  322 C) are integrated with the seal  306 C around the periphery. In some cases, each of the two guiding seals ( 321 C,  322 C) are proximate to a different portion (the first portion  343 C or the second portion  344 C) of the pneumatic structure  340 C. 
       FIG. 3D  illustrates how the first portion  343 C of the pneumatic structure  340 C can be rearranged after they are partially separated. In some cases, the first portion  343 C can be turned in an angle between 0° and 180°, or more. Similarly, while not illustrated, the second portion  344 C can be turned in an angle between 0° and 180°. When both the first portion  343 C and the second portion  344 C are turned in proximately 90°, the first portion  343 C and the second portion  344 C are arranged to be generally along a same line and can be used as an upper body blanket. 
       FIG. 3E  is a top plane view of one embodiment of a convective device  300 E having an optional separation device and optional air-guiding element; and  FIG. 3F  shows a top view of a reconfiguration of the example illustrated in  FIG. 3E  after two portions are partially separated. In this embodiment, the convective device  300 E has a flexible first layer  307 E, a flexible second layer (not illustrated), an opening  330 E, an optional separation device  310 E, and an optional air-guide device  320 E. In some cases, the flexible first layer  307 E has air permeable surface. The flexible second layer joining the first layer by a seal  306 E around a common periphery to form a pneumatic structure  340 E and seals  308 E to form inflatable channels, where the pneumatic structure  340 E has a first edge  341 E, a second edge  342 E opposing to the first edge  341 E, and two side edges ( 345 E,  346 E). In the example illustrated, the second edge  342 E includes two slanted edges ( 347 E,  348 E). The pneumatic structure  340 E has a first portion  343 E, a second portion  344 E, and an inflatable channel  345 E connecting the first portion  343 E and the second portion  344 E. In some cases, the convective device  300 E can be used as a lower body blanket suitable to cover the lower body of a person. 
     In some embodiments, the convective device  300 E includes at least one opening  330 E into the pneumatic structure  340 E. The opening  330 E can be in any form that allows an inflation medium source (not illustrated) to connect and provide inflation medium to inflate the pneumatic structure  340 E, for example, an inlet port with a rigid collar around the port as illustrated in  FIG. 3E . As other examples, the opening  330 E can include one or more inlet ports, cuffs, ports with rigid collars, sleeve openings at the edge, or the like. 
     In some embodiments, the separation device  310 E is disposed proximate to the first edge  341 E of the pneumatic structure  340 E. In some cases, the separation device includes an enclosure seal  312 E extending from the first edge  341 E toward the second edge  342 E, where the separation element  314 E has two extensions ( 316 E,  318 E) toward the respective side edges ( 346 E,  349 E), where the separation element  314 E with the two extensions ( 316 E,  318 E) is within the enclosure seal  312 E. In some cases, the extensions ( 316 E,  318 E) can be a straight line, a curved line, a slit, or the like. The separation device  310 E is adapted to partially separate the pneumatic structure into the two portions ( 343 E,  344 E) such that the relative position of the two portions can be rearranged. In the example as illustrated, the enclosure seal  312 E is generally in a T shape. The enclosure seal  312 E can be in, for example, a line, a curve, a continuous closed shape (e.g., a rectangular shape, an oval shape, etc.), or the like. The separation element  314 E comprises at least one of a line of weakness, perforation, slit, hook and loop, adhesive strip, or the like. In some cases, the longitudinal length of the separation device  310 E is more than half of the length between the first edge  341 E and the second edge  342 E. 
     In some cases, the air-guide device  320 E is disposed proximate to the second edge  342 E including the slanted portions ( 347 E,  348 E) of the pneumatic structure  340 E and adapted to direct flow of inflation medium. In some cases, the air-guide device  320 E is disposed between the first portion  343 E and the second portion  344 E. In some embodiments, the air-guide device  320 E comprises two sets of air-guide elements  321 E and  322 E, where each set of air-guide elements are disposed proximate to a respective slanted portion ( 347 E,  348 E) of the second edge  342 E. In some cases, an air-guide element can be in any closed shape, for example, such as a circle, an oval, a square, a rectangle, a polygon, or the like. In some cases, an air-guide element can be a small seal in any shape, for example, such as a line, a curve, or the like. As used herein, a small seal refers to a seal having a length or diameter relative small, for example, less than two inches (5.08 cm). In the example illustrated, the air-guide device  320 E further comprises two sets of air-guide elements  323 E and  324 E, opposing to the two sets of air-guide elements ( 321 E,  322 E) respectively and disposed proximately to the separation device  310 E. In some cases, the two sets of air-guide elements ( 321 E,  322 E) are directed to a different portion (the first portion  343 E or the second portion  344 E) of the pneumatic structure  340 E. In some embodiments, a set of air-guide elements can be disposed in a pattern. In some cases, a set of air-guide elements can be disposed with equal spacing. In some cases, a set of air-guide elements are disposed no more than one inch (2.54 cm) from the periphery seal  306 E. In some cases, a set of air-guide elements are disposed no more than two inches (5.08 cm) from the periphery seal  306 E. 
       FIG. 3F  illustrates how the first portion  343 E and the second portion  344 E of the pneumatic structure  340 E can be rearranged after they are partially separated. In some cases, the first portion  343 E can be turned in an angle between 0° and 180°. Similarly, the second portion  344 E can be turned in an angle between 0° and 180°. When both the first portion  343 E and the second portion  344 E are turned in proximately 90° the first portion  343 E and the second portion  344 E are arranged to be generally in a same line. 
       FIG. 3G  is a top plane view of one embodiment of a convective device  300 G having an optional separation device and optional air-guiding element; and  FIG. 3H  shows a top view of a reconfiguration of the example illustrated in  FIG. 3G  after two portions are partially separated. In this embodiment, the convective device  300 G has a flexible first layer  307 G, a flexible second layer (not illustrated), an opening  330 G, an optional separation device  310 G, and an optional air-guide device  320 G. In some cases, the flexible first layer  307 G has air permeable surface. The flexible second layer joining the first layer by a seal  306 G around a common periphery to form a pneumatic structure  340 G and seals  308 G to form inflatable channels, where the pneumatic structure  340 G has a first edge  341 G, a second edge  342 G opposing to the first edge  341 G, and two side edges ( 345 G,  346 G). The pneumatic structure  340 G has a first portion  343 G, a second portion  344 G, and an inflatable channel  345 G connecting the first portion  343 G and the second portion  344 G. In some cases, the convective device  300 G can be used as a lower body blanket suitable to cover the lower body of a person. 
     In some embodiments, the convective device  300 G includes at least one opening  330 G into the pneumatic structure  340 G. The opening  330 G can be in any form that allows an inflation medium source (not illustrated) to connect and provide inflation medium to inflate the pneumatic structure  340 G, for example, an inlet port as illustrated in  FIG. 3G . As other examples, the opening  330 G can include one or more inlet ports, cuffs, sleeve openings at the edge, or the like. 
     In some embodiments, the separation device  310 G is disposed proximate to the first edge  341 G of the pneumatic structure  340 G. In some cases, the separation device  310 G includes an enclosure seal  312 G extending from the first edge  341 G toward the second edge  342 G, where the separation element  314 G has two extensions ( 316 G,  318 G) toward the respective side edges ( 346 G,  349 G), and where the separation element  314 G is disposed within the enclosure seal  312 G. In the example illustrated, the extensions ( 316 G,  318 G) can be a straight line, a curved line, a slit, or the like. The separation device  310 G is adapted to partially separate the pneumatic structure into the two portions ( 343 G,  344 G) such that the relative position of the two portions can be rearranged. In the example as illustrated, the enclosure seal  312 G is generally in a T shape. The enclosure seal  312 G can be in, for example, a line, a curve, a continuous closed shape (e.g., a rectangular shape, an oval shape, etc.), or the like. The separation element  314 G comprises at least one of a line of weakness, perforation, slit, or the like. In some cases, the longitudinal length of the separation device  310 G is more than half of the length between the first edge  341 G and the second edge  342 G. 
     In some embodiments, the convective device  300 G may include a head warmer  360 G. The head warmer  360 G is configured to be disposed proximate to a person&#39;s neck or head. The head warmer  360 G includes two inflatable sections  361 G and  362 G. In the example as illustrated, the two parts ( 361 G,  362 G) can be partially separated from the convective device  300 G via the separation element  365 G. The separation element  365 G can include at least one of a line of weakness, a slit, a line of perforation, or the like. In some cases, the head warmer  360 G can have one or more wavy seal sections, which may for example, allow the head warmer to have conformity to the shape of head or neck. In some embodiments, the two parts  361 G and  362 G can be disposed by a person&#39;s neck when the convective device  300 G is re-arranged, for example, as illustrated in  FIG. 3H . 
     In some cases, the air-guide device  320 G is disposed proximate to the second edge  342 G of the pneumatic structure  340 G and adapted to direct flow of inflation medium. In some cases, the air-guide device  320 G is disposed within the inflatable channel  345 G connecting the first portion  343 G and the second portion  344 G. In some embodiments, the air-guide device  320 G comprises two guiding seals  321 G and  322 G, where each guiding seal ( 321 G,  322 G) is a wavy seal proximate to the second edge  342 G and connected to a respective side edge ( 346 G,  349 G). In the embodiment as illustrated, the air-guide device  320 G further comprises two wavy guiding seals  323 G and  324 G, opposing to the two guiding seals ( 321 G,  322 G) respectively and disposed proximate to the separation device  310 G. In this example, the guiding seals ( 321 G,  322 G) are integrated with the seal  306 G around the periphery. In some cases, the two wavy seals ( 321 G,  322 G) are directed to a different portion (the first portion  343 G or the second portion  344 G) of the pneumatic structure  340 G. 
       FIG. 3H  illustrates how the first portion  343 G and the second portion  344 G of the pneumatic structure  340 G can be rearranged after they are partially separated. In some cases, the first portion  343 G can be turned in an angle between 0° and 180°, or an angle greater than 180°. Similarly, the second portion  344 G can be turned in an angle between 0° and 180°, or an angle greater than 180°. When both the first portion  343 G and the second portion  344 G are turned in proximately 90°, the first portion  343 G and the second portion  344 G are arranged to be generally along a same line. In some embodiments that the convective device  300 G includes the head warmer  360 G having two parts, the two parts  361 G and  362 G can be disposed by a person&#39;s neck when the convective device  300 G is re-arranged, for example, as illustrated in  FIG. 3H . In such embodiments, when the convective device  300 G is inflated with heated air, the head warmer  360 G can provide heated air toward the person&#39;s head area. In some embodiments, the convective device  300 G may include one or more placement devices  335 G that can facilitate the placement and/or configuration of the convective device  300 G. The one or more placement devices  335 G may include, for example, buttons, snaps, hook and loop material, tape, and/or straps, or any equivalent thereof. As illustrated in  FIG. 3H , the placement device  335 G can be a tie strip integrally formed or defined in the convective device  300 G by a line of weakness. 
       FIG. 3I  is a top plane view of one embodiment of a convective device  300 I having an optional separation device and optional head warmer;  FIG. 3J  shows a top view of a reconfiguration of the example illustrated in  FIG. 3I  after head warmer is partially separated; and  FIG. 3K  illustrates how the head warmer can be used. In this embodiment, the convective device  300 I has a flexible first layer  307 I, a flexible second layer (not illustrated), an opening  330 I, an optional separation device  310 I, and an optional air-guide device  320 I. In some cases, the flexible first layer  307 I has air permeable surface. The flexible second layer joining the first layer by a seal  306 I around a common periphery to form a pneumatic structure  340 I and seals  308 I to form inflatable channels, where the pneumatic structure  340 I has a first edge  341 I, a second edge  342 I opposing to the first edge  341 I, and two side edges ( 345 I,  346 I). The pneumatic structure  340 I has a first portion  343 I, a second portion  344 I, and an inflatable channel  345 I connecting the first portion  343 I and the second portion  344 I. In some cases, the convective device  300 I can be used as a lower body blanket suitable to cover the lower body of a person. 
     In some embodiments, the convective device  300 I includes at least one opening  330 I into the pneumatic structure  340 I. The opening  330 I can be in any form that allows an inflation medium source (not illustrated) to connect and provide inflation medium to inflate the pneumatic structure  340 I, for example, an inlet port as illustrated in  FIG. 3I . As other examples, the opening  330 I can include one or more inlet ports, cuffs, ports having stiff collars, sleeve openings at the edge, or the like. 
     In some embodiments, the separation device  310 I is disposed proximate to the first edge  341 I of the pneumatic structure  340 I. In some cases, the separation device includes an enclosure seal  312 I extending from the first edge  341 I toward the second edge  342 I, where a separation element  314 I is within the enclosure seal  312 I. The separation device  310 I is adapted to partially separate the pneumatic structure into the two portions ( 343 I,  344 I) such that the relative position of the two portions can be rearranged. The enclosure seal  312 I can be in, for example, a line, a curve, a continuous closed shape (e.g., a rectangular shape, an oval shape, etc.), or the like. The separation element  314 I comprises at least one of a line of weakness, perforation, slit, or the like. In some cases, the longitudinal length of the separation device  310 I is more than half of the length between the first edge  341 I and the second edge  342 I. 
     In some cases, the air-guide device  320 I is disposed proximate to the second edge  342 I of the pneumatic structure  340 I and adapted to direct flow of inflation medium. In some cases, the air-guide device  320 I is disposed within the inflatable channel  345 I connecting the first portion  343 I and the second portion  344 I. In some embodiments, the air-guide device  320 I comprises two guiding seals  321 I and  322 I, where each guiding seal ( 321 I,  322 I) is a wavy guiding seal proximate to the second edge  342 I and connected to a respective side edge ( 346 I,  349 I). In the embodiment illustrated, the air-guide device  320 I further comprises two wavy guiding seals  323 I and  324 I, opposing to the two guiding seals ( 321 I,  322 I) respectively and disposed proximate to the separation device  310 I. In this example, the guiding seals ( 321 I,  322 I) are integrated with the seal  306 I around the periphery. In some cases, the two wavy seals ( 321 I,  322 I) are directed to a different portion (the first portion  343 I or the second portion  344 I) of the pneumatic structure  340 I. 
       FIG. 3J  illustrates how the first portion  343 I and the second portion  344 I of the pneumatic structure  340 I can be rearranged after they are partially separated. In some cases, the first portion  343 I can be turned in an angle between 0° and 180°, or an angle greater than 180°. Similarly, the second portion  344 I can be turned in an angle between 0° and 180°, or an angle greater than 180°. When both the first portion  343 I and the second portion  344 I are turned in proximately 90° the first portion  343 I and the second portion  344 I are arranged to be generally in a same line. 
     In some embodiments, the convective device  300 I includes a head warmer  360 I that is generally in a U shape. The head warmer  360 I can be partially separated from the convective device  300 I via a separation element  365 I. The separation element  365 I can include at least one of a line of weakness, a slit, a line of perforation, or the like. In some embodiments, the head warmer  360 I can be disposed by a person&#39;s neck or head when the convective device  300 I is re-arranged, for example, as illustrated in  FIG. 3K . In some cases, the head warmer  360 I can have one or more wavy seal sections, which may for example, allow the head warmer to have conformity to the shape of head or neck. In some cases, the head warmer  360 I may include a portion that can be completely separated from the convective device by the separation element  365 I. 
       FIG. 3L  is a top plane view of one embodiment of a convective device  300 L having an optional air-guiding element. In this embodiment, the convective device  300 L has a flexible first layer  307 L, a flexible second layer (not illustrated), an opening  330 L, and an optional air-guide device  320 L. In some cases, the flexible first layer  307 L has air permeable surface. The flexible second layer joining the first layer by a seal  306 L around a common periphery to form a pneumatic structure  340 L and seals  308 L to form inflatable channels, where the pneumatic structure  340 L has a first edge  341 L, a second edge  342 L opposing to the first edge  341 L. The pneumatic structure  340 L has a first portion  343 L, a second portion  344 L, and an inflatable channel  345 L connecting the first portion  343 L and the second portion  344 L. In some cases, the convective device  300 L can be used as an inflatable upper body blanket suitable to cover the upper body of a person. 
     In some embodiments, the convective device  300 L includes at least one opening  330 L into the pneumatic structure  340 L. The opening  330 L can be in any form that allows an inflation medium source (not illustrated) to connect and provide inflation medium to inflate the pneumatic structure  340 L, for example, an inlet port with a rigid collar around the port as illustrated in  FIG. 3L . As other examples, the opening  330 L can include one or more inlet ports, cuffs, ports with rigid collars, sleeve openings at the edge, or the like. 
     In some embodiments, the air-guide device  320 L includes two sets of air-guide elements  321 L and  322 L, where each set of air-guide elements are disposed proximate to a respective edge ( 341 L,  342 L). 
     In some cases, the air-guide device  320 L includes one or more sets of air-guide elements disposed in a pattern. In some cases, a set of air-guide elements can be disposed with equal spacing. In some cases, a set of air-guide elements are disposed no more than one inch (2.54 cm) from the periphery seal  306 L. In some cases, a set of air-guide elements are disposed no more than two inches (5.08 cm) from the periphery seal  306 L. In some cases, the air-guide device  320 L includes three sets of air-guide elements  321 L,  322 L, and  323 L disposed in a staggered pattern. 
     The first portion  343 L and the second portion  344 L of the pneumatic structure  340 L can be rearranged. In some cases, the first portion  343 L can be turned in an angle between 0° and 180°. Similarly, the second portion  344 L can be turned in an angle between 0° and 180°. When both the first portion  343 L and the second portion  344 L are turned in proximately 90° the first portion  343 L and the second portion  344 L are arranged to be generally in a same line. When the first portion  341 L and/or the second portion  342 L is rearranged, the air-guide device  320 L can facilitate forming one or more crease(s) where the convective device  300 L is bent when the convective device  300 L is inflated to reduce kinking effect and air pressure drop. 
     In some embodiments, the convective device  300 L may include one or more placement devices ( 335 L,  350 L) that can facilitate the placement and/or configuration of the convective device  300 L. The one or more placement devices may include, for example, adhesive patches or strips, buttons, snaps, hook and loop material, tape, and/or straps, or any equivalent thereof. As illustrated in  FIG. 3L , the placement device  335 L can be a tie strip integrally formed or defined in the convective device  300 L by a line of weakness. As another example, the placement device  340 L can be an adhesive strip disposed along an edge (e.g., edge  342 L) of the convective device  300 L. 
       FIGS. 4A-4H  illustrate some examples of air-guide devices/air-guide elements.  FIG. 4A  illustrates an air-guide device or air-guide element  400 A including two guiding seals  402 A and  404 A, where both seals are extending from a periphery seal  410 A.  FIG. 4B  illustrates an air-guide device or air-guide element  400 B including one guiding seal  402 B extending from a periphery seal  410 B.  FIG. 4C  illustrates an air-guide device or air-guide element  400 C including a continuous seal  402 C, in a curve shape, starting from a first position  411 C on a periphery seal  410 C and ending at a second position  412 C on the periphery seal  410 C different from the first position  411 C. When the convective device is inflated, the air-guide device  400 C can facilitate forming a number of creases proximate to the air-guide device  400 C in the convective device where the convective device is bent.  FIG. 4D  illustrates an air-guide device or air-guide element  400 D including a continuous seal  402 D starting from a first position  411 D on a periphery seal  410 D and ending at a second position  412 D on the periphery seal  410 D different from the first position  411 D. 
       FIG. 4E  illustrates an air-guide device or air-guide element  400 E including three guiding seals  402 E extending from a periphery seal  410 E.  FIG. 4F  illustrates an air-guide device or air-guide element  400 F including one seal  402 F disposed proximate to but not touching a periphery seal  410 F.  FIG. 4G  illustrates an air-guide device or air-guide element  400 G including one continuous seal  402 G in a closed shape or a closed shape seal  402 G disposed proximate to but not touching a periphery seal  410 G. The seal  402 G can be in any closed shapes, for example, such as circle, oval, square, rectangle, polygon, or the like. In some cases, the seal  402 G is no more than one inch (2.54 cm) from the periphery seal  410 G. In some cases, the seal  402 G is no more than two inches (5.08 cm) from the periphery seal  410 G. 
       FIG. 4H  illustrates an example of air-guide device  400 H that is an integrated part of or proximate to a periphery seal  410 H. The air-guide device  400 H includes a zigzag portion  402 H between first and second portions of the pneumatic structure as illustrated in  FIGS. 1A, 2A and 3A , for example, such that the zigzag portion  402 H is adapted to facilitate the generation of a number of distributed creases and direct inflation medium to reduce pressure drop of the inflation medium at the bending area when the configurable convective device is inflated and at least one of the first portion and the second portion are rearranged such that part of the convective device is bent. In some cases, the zigzag portion  402 H is integrated with the periphery seal  410 H. In some cases, the entire periphery seal can be zigzagged. In some cases, the zigzag portion  402 H is in a wavy shape. In some cases, the zigzag portion is a in a curve shape, square saw-tooth, triangular saw-tooth, or similar shape, or combination of shapes. 
     In some cases of using a convective device, a hose clamp may be used to maintain adequately air-tight connection between the hose and the convective device.  FIG. 5A  illustrates a perspective view of one embodiment of a hose clamp  500 ; and  FIG. 5B  illustrates a side view of the hose clamp  500 . In the embodiment illustrated, the hose clamp  500  includes an encircling element  510 , an optional grabbing component  520  extending from the encircling element, and an optional engaging component  530  disposed on or integrated with the encircling element. The encircling element  510  includes having an inner surface  512  and an opposing outer surface  514 . In some cases, the central angle  550  of the encircling element  510  is greater than 180 degree. In some cases, the central angle  550  of the encircling element  510  is smaller than 360 degree. 
     In some embodiments, the engaging component  530  includes a plurality of engaging elements  535 . In some implementations, the engaging component  530  includes a pattern of engaging elements  535 , for example, a pattern of a line, a pattern of a wave, a pattern of higher density proximate to the end, or the like. The encircling element  510  has a first end  541 , a second end  542 , and a middle portion  545 . In some cases, the encircling element  510  can be semi-rigid or rigid. The encircling element  510  can include materials, for example, polycarbonate, polyethylene, nylon, acrylonitrile butadiene styrene (ABS), polypropylene, polyvinyl chloride (PVC), and/or the like. In some cases, the grabbing component  520  and the engaging component  530  can include the same materials as the encircling element  510 . In some other cases, the grabbing component  520  and the engaging component  530  can include different materials as the encircling element  510 . In some cases, the engaging component can have a material the same as or different from the material used for the encircling element  510 . In some cases, the engaging component  530  can use soft materials, for example, urethane, thermoplastic materials, thermoplastic elastomers (TPE), or the like. The engaging elements  535  can have any shapes, for example, cylinder, half sphere, prism, hexagonal prism, trapezoidal prism, cube, cuboid, cone, pyramid, or the like. 
       FIG. 5C  illustrates a front view of another embodiment of a hose clamp  500 C. The hose clamp  500 C includes an encircling element  510 , an optional grabbing component  520 C extending from the encircling element, and an optional engaging component  530  disposed on or integrated with the encircling element. Components with same labels can have same or similar configurations, compositions, functionality and/or relationships as the corresponding components in  FIGS. 5A and 5B . In the embodiment illustrated, the grabbing component  520 C includes two elements  521  and  522 . 
       FIG. 6A  is a flattened view of a hose clamp  600  toward the inner surface of an encircling element;  FIG. 6B  is a perspective view of the hose clamp  600 ; and  FIG. 6C  is a side view of the hose clamp  600 . The hose clamp  600  includes an encircling element  610 , an optional grabbing component  630  and an optional engaging component  620 A. The encircling element  610  has a first end  612 , a second end  614 , and a middle portion  616 . The engaging component  620 A can include one or more sets of engaging elements  625 . In one embodiment, the engaging component  620 A includes a set of engaging elements  622  disposed proximate to the first end  612  of the encircling element  610 . In the example illustrated in  6 A, the set of engaging elements  622  includes multiple engaging elements  625  (with three illustrated) disposed in a line, where the engaging elements  625  are disposed in a line slanted from the first end  612 . In some embodiments, the engaging component  620 A includes a set of engaging elements  624  disposed proximate to the second end  614  of the encircling element  610 . In the example illustrated in  FIG. 6A , the set of engaging elements  624  includes multiple engaging elements  625  disposed in a line, where the engaging elements  625  are disposed in a line slanted from the second end  614 . In some embodiments, the engaging component  620 A includes a set of engaging elements  626  disposed in the middle portion  616 . In some cases, the set of engaging elements  626  includes at least three engaging elements  625  disposed in a line. 
       FIGS. 6D-6G  illustrate some example configurations of engaging components.  FIG. 6D  illustrates an engaging component  620 D includes three elongated engaging elements  622 D,  624 D, and  626 D that are generally parallel with each other and extend proximate the first end  612  to the second end  614 .  FIG. 6E  illustrates an engaging component  620 E includes three sets of engaging elements ( 622 E,  624 E, and  626 E). The set of engaging element  622 E is proximate to the first end  612  and is in a line. The set of engaging element  624 E is proximate to the second end  614  and is generally in a line. The set of engaging element  626 E is proximate to the center portion  616  and is generally parallel to either end. 
       FIG. 6F  illustrates an engaging component  620 F including three engaging elements ( 622 F,  624 F, and  626 F). The engaging element  622 F is disposed proximate to the first end  612 , the engaging element  624 F is disposed proximate to the second end  614 , and the engaging element  626 F is disposed at the center portion  616 . The three engaging elements  622 F,  624 F, and  626 F, as illustrated, may be disposed at locations with different distances to the edges of the encircling element  610 .  FIG. 6G  illustrates an engaging component  620 G including multiple engaging elements  625 . In one embodiment, the engaging elements  625  can be disposed discontinuously across the encircling element  610  from the first end  612  to the second end  614 . 
       FIG. 7  illustrates one embodiment of a system  700  for controlling temperature using a convective device and a hose clamp to maintain hose connection. The system  700  includes a hose  710  configured to connect to an inflation medium source (not illustrated), a hose clamp  720 , and a convective device  730 . The hose clamp  720  includes an encircling element  722  and an optional grabbing component  724  extending from the encircling element  722 . In some embodiments, the convective device  730  includes a flexible first layer  731 , a flexible second layer  732  joining the first layer  731  by a seal  734  around a common periphery to form a pneumatic structure  740 , and opening  735  into the pneumatic structure  740 . The first layer  731  and/or the second layer  732  have an air permeable surface. The hose clamp  720  is configured to maintain generally air-tight connection of the convective device  730  and the hose  710  when an end of the hose  710  is inserted into the opening  735 . 
     The hose clamp  720  can use any one of the hose clamp embodiments described in the present disclosure. In some cases, the encircling element  722  has an inner surface and an opposing outer surface, where the inner surface has a higher friction coefficient than the outer surface. In some cases, the outer surface of the hose  710  has relative high friction coefficient. 
     In some embodiments, the convective device  730  includes one or two slits  737  along one or both sides of the opening  735 , where one or both sides of the hose clamp  720  are configured to go through the slit  737  when the hose clamp  720  is in use. In some cases, the slit  737  is surrounded by a seal (not shown). In some configurations, the slit  737  is at the edge of the convective device  730 . In some other configurations, the slit  737  is not at the edge of the convective device  730 . In such configurations, the seal surrounding the slit  737  is an enclosed seal. The slit  737  can include, for example, an elongate opening, a line of weakness, perforation, or the like. 
     In some cases, one or more convective devices with any convective device embodiments described herein, can be attached to a gown and to be released from the gown.  FIG. 8  illustrates one embodiment of a gown  800  with a convective device  810  using any convective device embodiments described herein. In some cases, the convective device  810  can be folded and included in a sealed pouch or pocket of the gown  800 . In such cases, the convective device  810  can be taken out of the pouch or pocket when it is to be used. In some cases, the convective device  810  can be releasably attached to the gown  800  using an attachment device. An attachment device can use any releasable attachment means, for example, two-sided adhesive, perforated tear-away tabs, hook and loop, snaps, rivets, repositionable adhesives, mechanical reclosable fasteners, or the like. In some configurations, the convective device  810  can be folded separately from the gown  800 . For example, the convective device  810  can be stored in a pocket of the gown  800 . As another example, the convective device  810  and the gown  800  can dispose together in a kit. In the embodiment illustrated, the gown includes an additional convective device  805 . The convective device  810  includes two portions ( 843 ,  844 ) and an inflatable channel  845  connecting the two portions. 
     In some embodiments, the convective device  810  has two portions ( 843 ,  844 ). The convective device  810  is separated from the convective device  806  by a separation device  812 . The separation device  812  includes a seal  814  and a separation element  816 . In some cases, the convective device  810  includes an air-guide device  820  disposed in the inflatable channel  845 . The convective device  810  includes an opening  817  to connect to an inflation medium source. The convective device  805  includes an opening  807  to connect to an inflation medium source. The separation device  812  and air-guide device  820  can use any embodiments as disclosed herein. In some cases, the convective device  810  can be released from the gown and rearranged such that the two portions  843  and  844  are arranged to a different relative position (e.g., extended approximately along a same line). In such cases, the air-guide device  820  is configured to facilitate forming creases at the edge of the air-guide device when the configurable convective device  800  is inflated to reduce pressure drop of the inflation medium at the bending area. 
       FIG. 9  illustrates an example flow diagram of using a configurable convective device. The configurable convective device can use any one of the configurations described herein. First, inflate the configurable convective device (step  910 ). As an optional step, if the configurable convective device includes a separation device, use the separated device to partially separate the convective device into two portions. Place a first portion of the convective device in a first desirable position (step  920 ), for example, by bending the first portion to an angle. Optionally, place a second portion of the convective in a second desirable position (step  930 ), for example, by bending the first portion to an angle. Secure the convective device on a user(step  940 ), for example, using the placement device of the convective device such as tie strips or adhesive strips, using a sheet to affix the convective device, or by tucking in a portion of the convective device under a body part of the user. 
     Exemplary Embodiments 
     Item A1. A configurable convective device, comprising: 
     a flexible first layer having air permeable surface; 
     a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge; 
     at least one opening into the pneumatic structure; 
     a separation device disposed proximate to the first edge and adapted to separate a part of the pneumatic structure to a first portion and a second portion, comprising: 
     an enclosure seal extending from the first edge toward the second edge; and 
     a separation element within the enclosure seal; and 
     an air-guide device disposed proximate to the second edge and between the first portion and the second portion, the air-guide device configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent. 
     Item A2. The configurable convective device of Item A1, wherein at least a portion of the enclosure seal is generally perpendicular to the first edge. 
     Item A3. The configurable convective device of Item A1 or A2, wherein the separation element comprises at least one of a line of weakness, perforation, and slit. 
     Item A4. The configurable convective device of any one of Item A1-A3, the separation device further comprises: a second enclosure seal and a second separation element within the second enclosure seal. 
     Item A5. The configurable convective device of any one of Item A1-A4, wherein the air-guide device comprises a guiding seal extending from the second edge and toward the pneumatic structure. 
     Item A6. The configurable convective device of any one of Item A1-A5, wherein the first portion has a first longitudinal axis along a first direction, and wherein the first portion is adapted to be arranged such that the first longitudinal axis is along a second direction different from the first direction. 
     Item A7. The configurable convective device of Item A6, wherein the second direction is generally perpendicular to the first direction. 
     Item A8. The configurable convective device of Item A6, wherein the second portion has a second longitudinal axis along a third direction, and wherein second portion is adapted to be arranged such that the second longitudinal axis is along a fourth direction different from the third direction. 
     Item A9. The configurable convective device of Item A8, wherein the fourth direction is generally perpendicular to the third direction. 
     Item A10. The configurable convective device of any one of Item A1-A9, wherein the air-guide device comprises two guiding seals, each guiding seal extending from the second edge and toward the pneumatic structure. 
     Item A11. The configurable convective device of Item A10, wherein the two guiding seals are generally perpendicular with each other. 
     Item A12. The configurable convective device of any one of Item A1-A11, wherein the air-guide device comprises a continuous seal starting from a first position on the second edge and ending at a second position on the second edge, the first position being different from the second position. 
     Item A13. The configurable convective device of any one of Item A1-A12, wherein the pneumatic structure has an average length between the first edge and the second edge, wherein a length of the separation device is equal to or greater than one-half of the average length of the pneumatic structure. 
     Item A14. The configurable convective device of any one of Item A1-A12, wherein the pneumatic structure has a width and the second edge has a first end and a second end, and wherein the air-guide device is disposed at a center portion of the pneumatic structure that is in the area with a starting point at a distance of ⅖ of the width from the first end of the second edge and a ending point at a distance of ⅖ of the width from the second end of the second edge. 
     Item A15. The configurable convective device of any one of Item A1-A14, wherein the air-guide device comprises a wavy seal integrated with the seal around the common periphery. 
     Item A16. The configurable convective device of any one of Item A1-A15, wherein the air-guide device comprises a plurality of staked seals disposed proximate to the seal around the common periphery. 
     Item A17. The configurable convective device of any one of Item A1-A16, further comprising: a head warmer configured to be disposed proximate to a person&#39;s neck, wherein the head warmer comprises one or more inflatable sections partially separated from the configurable convective device. 
     Item A18. The configurable convective device of Item A17, wherein the head warmer comprises two adjacent inflatable sections. 
     Item A19. The configurable convective device of Item A17, wherein the head warmer comprises a U-shape inflatable section. 
     Item A20. An inflatable upper body blanket, comprising: 
     a flexible first layer having air permeable surface; 
     a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge; 
     at least one opening into the pneumatic structure; 
     a separation device disposed proximate to the first edge and adapted to separate a part of the pneumatic structure to a first portion and a second portion, comprising: 
     an enclosure seal extending from the first edge toward the second edge; 
     a separation element within the enclosure seal; and 
     an air-guide device disposed proximate to the second edge and configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent, 
     wherein the first portion of the pneumatic structure has a first longitudinal axis and the second portion of the pneumatic structure has a second longitudinal axis, and wherein the first longitudinal axis and the second longitudinal axis are generally extended along a same line. 
     Item A21. The inflatable upper body blanket of Item A20, wherein at least a portion of the enclosure seal is generally perpendicular to the first edge. 
     Item A22. The inflatable upper body blanket of Item A20 or A21, wherein the separation element comprises at least one of a line of weakness, perforation, and slit. 
     Item A23. The inflatable upper body blanket of any one of Item A20-A22, the separation device further comprises: a second enclosure seal and a second separation element within the second enclosure seal. 
     Item A24. The inflatable upper body blanket of any one of Item A20-A23, wherein the air-guide device comprises a guiding seal extending from the second edge and toward the pneumatic structure. 
     Item A25. The inflatable upper body blanket of any one of Item A20-A24, wherein the first longitudinal axis is along a first direction, and wherein the first portion is adapted to be arranged such that the first longitudinal axis is along a second direction different from the first direction. 
     Item A26. The inflatable upper body blanket of Item A25, wherein the second direction is generally perpendicular to the first direction. 
     Item A27. The inflatable upper body blanket of Item A25, wherein the second longitudinal axis is along a third direction, and wherein second portion is adapted to be arranged such that the second longitudinal axis is along a fourth direction different from the third direction. 
     Item A28. The inflatable upper body blanket of Item A27, wherein the fourth direction is generally perpendicular to the third direction. 
     Item A29. The inflatable upper body blanket of any one of Item A20-A28, wherein the air-guide device comprises two guiding seals, each guiding seal extending from the second edge and toward the pneumatic structure. 
     Item A30. The inflatable upper body blanket of Item A29, wherein the two guiding seals are generally perpendicular with each other. 
     Item A31. The inflatable upper body blanket of any one of Item A20-A30, wherein the air-guide device comprises a continuous seal starting from a first position on the second edge and ending at a second position on the second edge, the first position being different from the second position. 
     Item A32. The inflatable upper body blanket of any one of Item A20-A31, wherein the pneumatic structure has an average length between the first edge and the second edge, wherein a length of the separation device is equal to or greater than one-half of the average length of the pneumatic structure. 
     Item A33. An inflatable upper body blanket, comprising: 
     a flexible first layer having air permeable surface; 
     a flexible second layer joining the first layer by a periphery seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge, wherein the pneumatic structure comprises a first portion, a second portion, and an inflatable channel connecting to the first portion and the second portion; 
     at least one opening into the pneumatic structure; and 
     an air-guide device disposed between the first portion and the second portion, the air-guide device configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent. 
     Item A34. The inflatable upper body blanket of Item A33, wherein the air-guide device comprises a first set of air-guide seals disposed proximate to the periphery seal close to the first edge. 
     Item A35. The inflatable upper body blanket of Item A33 or A34, wherein the air-guide device comprises a second set of air-guide seals disposed proximate to the periphery seal close to the second edge. 
     Item B1. A configurable convective device, comprising: 
     a flexible first layer having air permeable surface; 
     a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge, wherein the pneumatic structure comprises a first portion, a second portion, and an inflatable channel connecting the first portion and the second portion; 
     at least one opening into the pneumatic structure; 
     a separation device disposed on the first edge and between the first portion and the second portion, comprising: 
     an enclosure seal extending from the first edge toward the second edge, 
     a separation element within the enclosure seal, and 
     an air-guide device disposed between the first portion and the second portion, the air-guide device configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent. 
     Item B2. The configurable convective device of Item B1, wherein the air-guide device is disposed proximate to the second edge. 
     Item B3. The configurable convective device of Item B1 or B2, wherein the air-guide device is configured to facilitate forming creases at the edge of the air-guide device when the configurable convective device is inflated and at least one of the first portion and the second portion are rearranged such that part of the convective device is bent. 
     Item B4. The configurable convective device of any one of Item B1-B3, wherein the pneumatic structure has a width and the second edge has a first end and a second end, and wherein the air-guide device is disposed at a center portion of the pneumatic structure that is in the area with a starting point at a distance of ⅖ of the width from the first end of the second edge and a ending point at a distance of ⅖ of the width from the second end of the second edge. 
     Item B5. The configurable convective device of any one of Item B1-B4, wherein the air-guide device is disposed at the half portion of inflatable channel that is closer to the second edge and further away from the first edge. 
     Item B6. The configurable convective device of any one of Item B1-B5, wherein at least a portion of the enclosure seal is generally perpendicular to the first edge. 
     Item B7. The configurable convective device of any one of Item B1-B6, wherein the separation element comprises at least one of a line of weakness, perforation, and slit. 
     Item B8. The configurable convective device of any one of Item B1-B7, the separation device further comprises: a second enclosure seal and a second separation element within the second enclosure seal. 
     Item B9. The configurable convective device of any one of Item B1-B8, wherein the air-guide device comprises a guiding seal extending from the second edge and toward the pneumatic structure. 
     Item B10. The configurable convective device of any one of Item B1-B9, wherein the first portion has a first longitudinal axis along a first direction, and wherein the first portion is adapted to be arranged such that the first longitudinal axis is along a second direction different from the first direction. 
     Item B11. The configurable convective device of Item B10, wherein the second direction is generally perpendicular to the first direction. 
     Item B12. The configurable convective device of Item B10, wherein the second portion has a second longitudinal axis along a third direction, and wherein second portion is adapted to be arranged such that the second longitudinal axis is along a fourth direction different from the third direction. 
     Item B13. The configurable convective device of Item B12, wherein the fourth direction is generally perpendicular to the third direction. 
     Item B14. The configurable convective device of any one of Item B1-B13, wherein the air-guide device comprises two guiding seals, each guiding seal extending from the second edge and toward the pneumatic structure. 
     Item B15. The configurable convective device of Item B14, wherein the two guiding seals are generally perpendicular with each other. 
     Item B16. The configurable convective device of any one of Item B1-B15, wherein the air-guide device comprises a continuous seal starting from a first position on the second edge and ending at a second position on the second edge, the first position being different from the second position. 
     Item B17. The configurable convective device of any one of Item B1-B16, wherein the pneumatic structure has an average length between the first edge and the second edge, wherein a length of the separation device is equal to or greater than one-half of the average length of the pneumatic structure. 
     Item B18. A configurable convective device, comprising: 
     a flexible first layer having air permeable surface; 
     a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge, wherein the pneumatic structure comprises a first portion, a second portion, and an inflatable channel connecting the first portion and the second portion; 
     at least one opening into the pneumatic structure; 
     a separation device disposed on the first edge and between the first portion and the second portion, comprising: 
     an enclosure seal extending from the first edge toward the second edge, 
     a separation element within the enclosure seal, and 
     wherein the second edge comprises a sinusoidal portion between the first and second portions of the pneumatic structure, such that the sinusoidal portion is adapted to direct inflation medium when the configurable convective device is inflated and at least one of the first portion and the second portion is bent. 
     Item B19. The configurable convective device of Item B18, wherein at least a portion of the second edge is sinusoidal. 
     Item B20. The configurable convective device of Item B18 or B19, wherein the sinusoidal portion is in a wavy shape. 
     Item B21. The configurable convective device of any one of Item B18-B20, wherein the sinusoidal portion is a in a curve shape. 
     Item C1. A hose clamp, comprising: 
     an encircling element having an inner surface and an opposing outer surface, and 
     a grabbing component extending from the encircling element, 
     an engaging component disposed on or integrated with the encircling element and comprising a plurality of engaging elements. 
     Item C2. The hose clamp of Item C1, wherein the encircling element has a first end and a second end, and wherein the engaging component comprises a first set of engaging elements disposed proximate to the first end. 
     Item C3. The hose clamp of Item C2, wherein the engaging component further comprises a second set of engaging elements disposed proximate to the second end. 
     Item C4. The hose clamp of Item C2, wherein the first set of engaging elements comprises at least three engaging elements disposed in a line. 
     Item C5. The hose clamp of Item C4, wherein the at least three engaging elements are disposed in a line slanted from the first end. 
     Item C6. The hose clamp of Item C3, wherein the second set of engaging elements comprises at least three engaging elements disposed in a line. 
     Item C7. The hose clamp of Item C6, wherein the at least three engaging elements are disposed in a line slanted from the second end. 
     Item C8. The hose clamp of any one of Item C1-C7, wherein the encircling element has a middle portion, and wherein the engaging component comprises a third set of engaging elements disposed in the middle portion. 
     Item C9. The hose clamp of Item C8, wherein the third set of engaging elements comprises at least three engaging elements disposed in a line. 
     Item D1. A system for controlling temperature using convective device, comprising: 
     a hose configured to connect to a inflation medium source; 
     a convective device, comprising:
         a flexible first layer having air permeable surface;   a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure; and   an opening into the pneumatic structure; and       

     a hose clamp, comprising:
         an encircling element, and   a grabbing component extending from the encircling element;       

     wherein the hose clamp is configured to maintain generally air-tight connection of the convective device and the hose when an end of the hose is inserted into the opening. 
     Item D2. The system of Item D1, wherein the encircling element having an inner surface and an opposing outer surface, wherein the inner surface having a higher friction coefficient than the outer surface. 
     Item D3. The system of Item D1 or D2, wherein the central angle of the encircling element is greater than 180 degree. 
     Item D4. The system of any one of Item D1 -D3, wherein the central angle of the encircling element is smaller than 360 degree. 
     Item D5. The system of any one of Item D1-D4, wherein the convective device further comprises: 
     an enclosed seal along a side of the opening; and 
     a slit in the enclosed seal, 
     wherein a side of the hose clamp is configured to go through the slit when the hose clamp is in use. 
     Item D6. The system of any one of Item DI1-D5, wherein the hose clamp further comprises: an engaging component disposed on or integrated with the encircling element and comprising a plurality of engaging elements. 
     Item D7. The system of Item D6, wherein the encircling element has a first end and a second end, and wherein the engaging component comprises a first set of engaging elements disposed proximate to the first end. 
     Item D8. The system of Item D7, wherein the engaging component further comprises a second set of engaging elements disposed proximate to the second end. 
     Item D9. The system of Item D7, wherein the first set of engaging elements comprises at least three engaging elements disposed in a line. 
     Item D10. The system of Item D9, wherein the at least three engaging elements are disposed in a line slanted from the first end. 
     Item D11. The system of Item D8, wherein the second set of engaging elements comprises at least three engaging elements disposed in a line. 
     Item D12. The system of Item D11, wherein the at least three engaging elements are disposed in a line slanted from the second end. 
     Item D13. The system of Item D6, wherein the encircling element has a middle portion, and wherein the engaging component comprises a third set of engaging elements disposed in the middle portion. 
     Item D14. The system of Item D13, wherein the third set of engaging elements comprises at least three engaging elements disposed in a line. 
     Item E1. A combination, comprising: 
     a garment, 
     a configurable convective device, comprising:
         a flexible first layer having air permeable surface;   a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge;   at least one opening into the pneumatic structure;   a separation device disposed proximate to the first edge and adapted to separate a part of the pneumatic structure to a first portion and a second portion, comprising:       

     an enclosure seal extending from the first edge toward the second edge; and 
     a separation element within the enclosure seal; and 
     an attachment device configured to attach the configuration convective device to the garment. 
     Item E2. The combination of Item E1, wherein the configurable convective device further comprises: 
     an air-guide device disposed proximate to the second edge and between the first portion and the second portion, the air-guide device configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent. 
     Item E3. The combination of Item E1 or E2, wherein at least a portion of the enclosure seal is generally perpendicular to the first edge. 
     Item E4. The combination of any one of Item E1-E3, wherein the separation element comprises at least one of a line of weakness, perforation, and slit. 
     Item E5. The combination of any one of Item E1-E4, the separation device further comprises: a second enclosure seal and a second separation element within the second enclosure seal. 
     Item E6. The combination of Item E2, wherein the air-guide device comprises a guiding seal extending from the second edge and toward the pneumatic structure. 
     Item E7. The combination of any one of Item E1-E6, wherein the first portion has a first longitudinal axis along a first direction, and wherein the first portion is adapted to be arranged such that the first longitudinal axis is along a second direction different from the first direction. 
     Item E8. The combination of Item E7, wherein the second direction is generally perpendicular to the first direction. 
     Item E9. The combination of Item E8, wherein the second portion has a second longitudinal axis along a third direction, and wherein second portion is adapted to be arranged such that the second longitudinal axis is along a fourth direction different from the third direction. 
     Item E10. The combination of Item E9, wherein the fourth direction is generally perpendicular to the third direction. 
     Item E11. The combination of Item E2, wherein the air-guide device comprises two guiding seals, each guiding seal extending from the second edge and toward the pneumatic structure. 
     Item E12. The combination of Item E11, wherein the two guiding seals are generally perpendicular with each other. 
     Item E13. The combination of Item E2, wherein the air-guide device comprises a continuous seal starting from a first position on the second edge and ending at a second position on the second edge, the first position being different from the second position. 
     Item E14. The combination of any one of Item E1-E13, wherein the pneumatic structure has an average length between the first edge and the second edge, wherein a length of the separation device is equal to or greater than one-half of the average length of the pneumatic structure. 
     Item E15. The combination of Item E2, wherein the pneumatic structure has a width and the second edge has a first end and a second end, and wherein the air-guide device is disposed at a center portion of the pneumatic structure that is in the area with a starting point at a distance of ⅖ of the width from the first end of the second edge and a ending point at a distance of ⅖ of the width from the second end of the second edge. 
     Item E16. The combination of Item E2, wherein the air-guide device comprises a wavy seal integrated with the seal around the common periphery. 
     Item E17. The combination of Item E2, wherein the air-guide device comprises a plurality of staked seals disposed proximate to the seal around the common periphery. 
     Item E18. The combination of any one of Item E1-E17, wherein the configurable convective device further comprises a head warmer configured to be disposed proximate to a person&#39;s neck, wherein the head warmer comprises one or more inflatable sections partially separated from the configurable convective device. 
     Item E19. The combination of Item E18, wherein the head warmer comprises two adjacent inflatable sections. 
     Item E20. The combination of Item E18, wherein the head warmer comprises a U-shape inflatable section. 
     Item E21. The combination of any one of Item E1-E20, wherein the attachment device comprises at least one of a two-sided adhesive strip, a perforated tear-away tab, hook and loop, a snap, a rivet, a repositionable adhesive strip, and a mechanical reclosable fastener. 
     Item F1. A combination, comprising: 
     a garment, 
     a configurable convective device, comprising:
         a flexible first layer having air permeable surface;   a flexible second layer joining the first layer by a seal around a common periphery to form a pneumatic structure, the pneumatic structure having a first edge and an opposing second edge;   at least one opening into the pneumatic structure;   an air-guide device disposed proximate to the second edge and between the first portion and the second portion, the air-guide device configured to direct flow of inflation medium at a bending area when at least one of the first and second portions is bent; and       

     an attachment device configured to attach the configuration convective device to the garment. 
     Item F2. The combination of Item F1, wherein the configurable convective device further comprises a separation device disposed proximate to the first edge and adapted to separate a part of the pneumatic structure to a first portion and a second portion, comprising: 
     an enclosure seal extending from the first edge toward the second edge; and 
     a separation element within the enclosure seal. 
     Item F3. The combination of Item F2, wherein at least a portion of the enclosure seal is generally perpendicular to the first edge. 
     Item F4. The combination of Item F2 or F3, wherein the separation element comprises at least one of a line of weakness, perforation, and slit. 
     Item F5. The combination of Item F2, the separation device further comprises: a second enclosure seal and a second separation element within the second enclosure seal. 
     Item F6. The combination of any one of Item F1-F5, wherein the air-guide device comprises a guiding seal extending from the second edge and toward the pneumatic structure. 
     Item F7. The combination of any one of Item F1-F6, wherein the first portion has a first longitudinal axis along a first direction, and wherein the first portion is adapted to be arranged such that the first longitudinal axis is along a second direction different from the first direction. 
     Item F8. The combination of Item F7, wherein the second direction is generally perpendicular to the first direction. 
     Item F9. The combination of Item F8, wherein the second portion has a second longitudinal axis along a third direction, and wherein second portion is adapted to be arranged such that the second longitudinal axis is along a fourth direction different from the third direction. 
     Item F10. The combination of Item F9, wherein the fourth direction is generally perpendicular to the third direction. 
     Item F11. The combination of any one of Item F1-F10, wherein the air-guide device comprises two guiding seals, each guiding seal extending from the second edge and toward the pneumatic structure. 
     Item F12. The combination of Item F11, wherein the two guiding seals are generally perpendicular with each other. 
     Item F13. The combination of any one of Item F1-F12, wherein the air-guide device comprises a continuous seal starting from a first position on the second edge and ending at a second position on the second edge, the first position being different from the second position. 
     Item F14. The combination of any one of Item F1-F13, wherein the pneumatic structure has an average length between the first edge and the second edge, wherein a length of the separation device is equal to or greater than one-half of the average length of the pneumatic structure. 
     Item F15. The combination of any one of Item F1-F14, wherein the pneumatic structure has a width and the second edge has a first end and a second end, and wherein the air-guide device is disposed at a center portion of the pneumatic structure that is in the area with a starting point at a distance of ⅖ of the width from the first end of the second edge and a ending point at a distance of ⅖ of the width from the second end of the second edge. 
     Item F16. The combination of any one of Item F1-F15, wherein the air-guide device comprises a wavy seal integrated with the seal around the common periphery. 
     Item F17. The combination of any one of Item F1-F16, wherein the air-guide device comprises a plurality of staked seals disposed proximate to the seal around the common periphery. 
     Item F18. The combination of any one of Item F1-F17, wherein the configurable convective device further comprises a head warmer configured to be disposed proximate to a person&#39;s neck, wherein the head warmer comprises one or more inflatable sections partially separated from the configurable convective device. 
     Item F19. The combination of Item F18, wherein the head warmer comprises two adjacent inflatable sections. 
     Item F20. The combination of Item F18, wherein the head warmer comprises a U-shape inflatable section. 
     Item F21. The combination of any one of Item F1-F20, wherein the attachment device comprises at least one of a two-sided adhesive strip, a perforated tear-away tab, hook and loop, a snap, a rivet, a repositionable adhesive strip, and a mechanical reclosable fastener. 
     The present invention should not be considered limited to the particular examples and embodiments described above, as such embodiments are described in detail to facilitate explanation of various aspects of the invention. Rather the present invention should be understood to cover all aspects of the invention, including various modifications, equivalent processes, and alternative devices falling within the spirit and scope of the invention as defined by the appended claims and their equivalents.