Patent Publication Number: US-10765786-B2

Title: System and method for multiple direction flexible inline canister

Description:
RELATED APPLICATIONS 
     This application is a divisional of U.S. patent application Ser. No. 14/204,671 filed Mar. 11, 2014, which claims the benefit under 35 U.S.C. § 119(e), of U.S. Provisional Patent Application No. 61/802,888 filed Mar. 18, 2013, entitled “System and Method for Multiple Direction Flexible Inline Canister,” which are incorporated herein by reference for all purposes. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates generally to medical treatment systems for treating tissue sites and processing fluids. More particularly, but not by way of limitation, the present disclosure relates to inline storage pouches, systems, and methods for receiving and storing exudates from a tissue site. 
     BACKGROUND 
     Caring for wounds is important in the healing process. Wounds often produce considerable exudate. Medical dressings are often used in wound care to address the production of liquids from the wound. If not properly addressed, liquids at the wound can lead to infection or maceration at or near the wound. Wound dressings may be used alone or as an aspect of applying reduced pressure to a tissue site. 
     Clinical studies and practice have shown that reducing pressure in proximity to a tissue site can augment and accelerate growth of new tissue at the tissue site. The applications of this phenomenon are numerous, but it has proven particularly advantageous for treating wounds. Regardless of the etiology of a wound, whether trauma, surgery, or another cause, proper care of the wound is important to the outcome. Treatment of wounds or other tissue with reduced pressure may be commonly referred to as “negative-pressure therapy,” but is also known by other names, including “negative-pressure wound therapy,” “reduced-pressure therapy,” “vacuum therapy,” and “vacuum-assisted closure,” for example. Negative-pressure therapy may provide a number of benefits, including migration of epithelial and subcutaneous tissues, improved blood flow, and micro-deformation of tissue at a wound site. Together, these benefits can increase development of granulation tissue and reduce healing times. 
     While the clinical benefits of negative-pressure therapy are widely known, the cost and complexity of negative-pressure therapy can be a limiting factor in its application, and the development and operation of negative-pressure systems, components, and processes continues to present significant challenges to manufacturers, healthcare providers, and patients. 
     SUMMARY 
     According to some illustrative embodiments, a system for treating a tissue site with reduced pressure is described. The system may include a reduced-pressure source, a pouch in fluid communication with the reduced pressure source, and a dressing in fluid communication with the pouch. The pouch may include a first wall, a second wall having a periphery coupled to the first wall to form an interior, and a third wall extending through the interior to form a first chamber in fluid communication with the dressing and a second chamber in fluid communication with the reduced pressure source. A plurality of filters may be positioned in the third wall. The filters may permit fluid communication between the first chamber and the second chamber. 
     According to other illustrative embodiments, a pouch for use with fluids from a tissue site is described. The pouch may include a first wall and a second wall having a peripheral portion coupled to the first wall to form an interior. A third wall may extend through the interior to form a first chamber adapted to be in fluid communication with a dressing and a second chamber adapted to be in fluid communication with a reduced pressure source. A plurality of filters may be positioned in the third wall. The filters may permit fluid communication between the first chamber and the second chamber. Reduced pressure supplied to the second chamber may be supplied to the first chamber through the filters. 
     According to other illustrative embodiments, a method of manufacturing an inline storage pouch is described. A pouch may be formed having a first chamber and a second chamber, and an absorbent material may be disposed within the first chamber. A manifold may be disposed within the second chamber. A first port may be coupled to the pouch. The first port may be configured to fluidly couple the first chamber to a dressing for receiving fluids. A second port may also be coupled to the pouch. The second port may be configured to fluidly couple the second chamber to a therapy unit for supplying reduced pressure. A plurality of air bridges may be coupled between the first chamber and the second chamber to provide fluid communication between the first chamber and the second chamber. 
     According to other illustrative embodiments, a method for treating a tissue site with reduced pressure is described. A reduced-pressure source and a dressing proximate to the tissue site to receive liquids from the tissue site may be provided. A pouch may also be provided. The pouch may include a first wall, a second wall coupled to the first wall on peripheral portions of the first wall and the second wall to form an interior, and a third wall extending through the interior to form a first chamber adapted to be in fluid communication with the dressing and a second chamber adapted to be in fluid communication with the reduced pressure source. The pouch may further include a plurality of filter assemblies positioned in the third wall. The filter assemblies may permit fluid communication between the first chamber and the second chamber. Each filter assembly may be separated from adjacent filter assemblies. Reduced pressure supplied to the second chamber may be supplied to the first chamber through the filter assemblies. The reduced-pressure source may be fluidly coupled to the second chamber, and the dressing may be fluidly coupled to the first chamber. Reduced pressure may be supplied to the dressing through the second chamber, filter assemblies, and the first chamber. Liquids may be received and stored in the first chamber in response to the supply of reduced pressure. 
     According to other illustrative embodiments, an apparatus for storing fluid is described. The apparatus may include a first chamber and a second chamber. The apparatus may further include a first manifold disposed in the first chamber, and a second manifold disposed in the second chamber. At least two air bridges may couple the first manifold and the second manifold. An absorbent may be disposed in the second chamber proximate to the second manifold. 
     Other aspects, features, and advantages of the illustrative embodiments will become apparent with reference to the drawings and detailed description that follow. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of a reduced-pressure system for treating a tissue site in accordance with some embodiments; 
         FIG. 2  is a schematic diagram, with a portion shown in cross section and a portion in plan view, of the reduced-pressure system of  FIG. 1 ; 
         FIGS. 3A and 3B  are perspective views of an inline storage pouch that may be associated with the reduced-pressure system of  FIG. 1 ; 
         FIG. 4A  is a cross-sectional view of the inline storage pouch of  FIG. 3A  taken along line  4 - 4 ; 
         FIG. 4B  is a cross-sectional view of a portion of the inline storage pouch of  FIG. 4A  illustrating an alternative port of the inline storage pouch; 
         FIGS. 5A and 5B  are exploded perspective views of the inline storage pouch of  FIG. 3A ; 
         FIG. 6  is a schematic diagram of the inline storage pouch of  FIG. 3A ; 
         FIG. 7  is an elevation view of the inline storage pouch of  FIG. 3A ; 
         FIG. 8  is an elevation view of another embodiment of an inline storage pouch that may be associated with the reduced-pressure system of  FIG. 1 ; 
         FIG. 9  is an elevation view of another embodiment of an inline storage pouch having fluid stored therein; 
         FIG. 10  is an elevation view of the inline storage pouch of  FIG. 9  having fluid stored therein, in a second orientation; 
         FIG. 11  is an elevation view of the inline storage pouch of  FIG. 9  having fluid stored therein, in a third orientation; and 
         FIG. 12  is an elevation view of the inline storage pouch of  FIG. 9  having fluid stored therein, in a fourth orientation. 
     
    
    
     DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     New and useful systems, methods, and apparatuses for providing an inline storage pouch to receive and store exudates from a tissue site, the inline storage pouch to be used with a reduced-pressure system, are set forth in the appended claims. Objectives, advantages, and a preferred mode of making and using the systems, methods, and apparatuses may be understood best by reference to the following detailed description in conjunction with the accompanying drawings. The description provides information that enables a person skilled in the art to make and use the claimed subject matter, but may omit certain details already well-known in the art. Moreover, descriptions of various alternatives using terms such as “or” do not necessarily require mutual exclusivity unless clearly required by the context. The claimed subject matter may also encompass alternative embodiments, variations, and equivalents not specifically described in detail. The following detailed description should therefore be taken as illustrative and not limiting. 
     The example embodiments may also be described herein in the context of reduced-pressure therapy applications, but many of the features and advantages are readily applicable to other environments and industries. Spatial relationships between various elements or to the spatial orientation of various elements may be described as depicted in the attached drawings. In general, such relationships or orientations assume a frame of reference consistent with or relative to a patient in a position to receive reduced-pressure therapy. However, as should be recognized by those skilled in the art, this frame of reference is merely a descriptive expedient rather than a strict prescription. 
       FIG. 1  is a schematic view, illustrating details of an illustrative embodiment of a system  100  for treating a tissue site with reduced pressure. System  100  is shown applied to a human, but system  100  may be used on other types of subjects. System  100  may include an inline storage pouch, such as pouch  104 , a reduced-pressure dressing, such as a dressing  106  (or other fluid reception device), and a therapy unit, such as therapy unit  108 . In some embodiments, dressing  106  may be fluidly coupled to pouch  104  with a first conduit  128 , and pouch  104  may be fluidly coupled to therapy unit  108  with a second conduit  150 . Therapy unit  108  may provide reduced pressure, as described in more detail below, through second conduit  150 , pouch  104 , and first conduit  128  to dressing  106  to remove fluids from a tissue site. Fluids may be delivered to pouch  104  for storage and later removal. In other embodiments, the fluids may be from an ostomy bag or another source rather than dressing  106 . 
     Pouch  104  may include one or more straps  110  configured to mount pouch  104  to person  102 . Similarly, therapy unit  108  may also include one or more straps  114 , allowing therapy unit  108  to be mounted to person  102 . Straps  110  and straps  114  may be elastomeric members, belt-like members, or the like. In addition, straps  110  and straps  114  may be adjustable, permanently secured, or releasably coupled to pouch  104  and therapy unit  108 , respectively. In some embodiments, straps  110  and straps  114  may allow positioning of pouch  104  and therapy unit  108  at different locations on person  102  so that the weight of system  100  may be distributed at more than one location of person  102 . For example, pouch  104  may be strapped to a portion of person  102 , such as a leg  112 , using straps  110  or other attachment devices. Similarly, therapy unit  108  may be mounted to another portion of person  102 , such as a waist  113 , using straps  114 . Therapy unit  108  and pouch  104  may also be mounted at locations other than person  102 , for example, on a bed, pole, or the like. 
     Pouch  104  may be flexible, allowing pouch  104  to conform to a portion of the body of person  102 , thereby enhancing safety and comfort of person  102 . In addition, the flexible nature of pouch  104  may allow pouch  104  to be stored in a small space. Pouch  104  may be relatively easy to manufacture compared to rigid canisters that have been used to collect liquids. Moreover, if pouch  104  is used with animals, the flexible nature may help prevent injury, for example, if the animal bumps surfaces or rolls over. In addition, pouch  104  may be oriented as shown in  FIG. 1 , or pouch  104  may be oriented in other positions to improve fit to, and comfort of, person  102 . 
     The ability of a flexible canister, such as pouch  104 , to work efficiently can be dependent on its orientation during use. Flexible canisters often include filters or filter assemblies to prevent fluids collected from a tissue site from reaching and potentially damaging a reduced-pressure source. As the flexible canister fills with exudates and other fluids from the tissue site, the position of the filter in relationship to the fluid path may affect the performance of the flexible canister. For example, a vertically oriented flexible canister may have a port fluidly connected to the tissue site on an upper end of the flexible canister and a port fluidly connected to a reduced pressure source, such as a device connector, on a lower end of the flexible canister. Fluid may move down the flexible canister from the port fluidly connected to the tissue site to the device connector due to the force of the negative pressure and gravity. Once the fluid reaches the lower end of the flexible canister it may be pulled across the device connector by the negative pressure. The canister may fill from the bottom upwards, and if the filter is positioned proximate to and in the fluid path of the device connector, the filter may become blocked prior to the flexible canister being filled. Blockage of the filter may cause a pressure drop that triggers an alarm and causes the therapy to stop. 
     In addition, an absorbent may be disposed in the flexible canister to store the fluids from the tissue site. The lower parts of the absorbent proximate to the lower end of the flexible canister may be at full capacity, for example, completely saturated, if the pressure drop occurs. This may be the result of a pooling effect caused by the absorbent being unable to retain any more liquid, allowing the liquid to pool proximate to the device connector and block the filter. A large percentage of the absorbent may not be in proximity to the device connector and may not have been contacted by the liquid, consequently, the absorbent may not fully absorb liquid, leaving a portion of the flexible canister unfilled. 
     As disclosed herein, system  100  can overcome these shortcomings by providing a flexible canister that manifolds fluid and air to provide a low pressure drop and an increased spread of exudates and other fluids from the tissue site throughout the flexible canister, such as pouch  104 . In one particular embodiment, system  100  may provide a multi-directional canister which can be used in a range of different form factors or orientations as a multi-point pressure manifold solution. Multiple orientation use of the flexible canister may permit use of the canister in a wider variety of locations, and persons. In addition, multiple orientation use of the flexible canister may permit the flexible canister to be used in a mobile environment. In other embodiments, system  100  may provide a multi-point pressure manifold solution, such as the pouch  104 , having two chambers with a plurality of fluid transfer points, such as filter assemblies, that permit fluid communication between the two chambers. One of the two chambers can store fluids and exudates from the tissue site, and another of the two chambers can bridge a port fluidly coupled to a reduced-pressure source to the chamber, storing fluids at each fluid transfer point within the flexible canister. 
       FIG. 2  is a schematic diagram, illustrating additional details that may be associated with some embodiments of system  100 , with a portion shown in cross section and a portion in plan view. Dressing  106  may be positioned at a tissue site  116  on leg  112  that extends through epidermis  118  and into dermis  120 . The term “tissue site” in this context broadly refers to a wound or defect located on or within tissue of a human, animal, or other organism, including but not limited to, bone tissue, adipose tissue, muscle tissue, neural tissue, dermal tissue, vascular tissue, connective tissue, cartilage, tendons, or ligaments. A wound may include chronic, acute, traumatic, subacute, and dehisced wounds, partial-thickness burns, ulcers (such as diabetic, pressure, or venous insufficiency ulcers), flaps, grafts, and fistulas, for example. The term “tissue site” may also refer to areas of tissue that are not necessarily wounded or defective, but are instead areas in which it may be desired to add or promote the growth of additional tissue. For example, reduced pressure may be used in certain tissue areas to grow additional tissue that may be harvested and transplanted to another tissue location. The term “tissue site” may also include incisions, such as a surgical incision. Tissue site  116  may include epidermis  118 , subcutaneous tissue, or other muscle tissue. Tissue site  116  may be surrounded by healthy or undamaged tissue, for example a portion of epidermis  118  that may be undamaged. Treatment of the tissue site  116  may include removal of fluids, for example, exudates or ascites. 
     In some embodiments, dressing  106  may include a tissue interface, such as manifold  122 , a tissue site covering, such as a drape  124 , and a connector  126 . Manifold  122  may be positioned adjacent to, and in contact with, tissue site  116 . Manifold  122  may be positioned proximate to tissue site  116  such that manifold  122  has a first surface that faces tissue site  116  and a second surface that may be opposite the first surface. The term “manifold” as used herein generally refers to a substance or structure that may be provided to assist in applying reduced pressure to, delivering fluids to, or removing fluids from tissue site  116 . Manifold  122  may include a plurality of flow channels or pathways that can distribute or collect fluids from across the tissue site  116  around manifold  122 . In one illustrative embodiment, the flow channels or pathways may be interconnected to improve distribution of fluids provided to, or removed from, tissue site  116 . 
     The flow channels described herein may be created by voids and/or cells in the manifold  122  that are fluidly connected to, or in communication with, adjacent voids and/or cells. The flow channels may be uniform in shape and size, or may include patterned or random variations in shape and size. Variations in shape and size of the voids and/or cells of the manifold  122  may be selectively chosen and used to alter the flow characteristics of fluid and/or exudates through the manifold  122 . 
     The flow channels described herein allow distribution of reduced pressure and/or transportation of exudates and other fluids to and from a particular tissue site. The flow channels provided may be an inherent characteristic of the manifold  122 , provided by a porosity of the manifold  122 , for example, or the flow channels may be chemically, mechanically, or otherwise formed in the material prior to or after assembly of the manifold  122 . In some embodiments, the void, pore, or cell sizes of the manifold  122  described herein may be in the range of about 50 microns to about 600 microns. In other illustrative embodiments, the pore size of the manifold  122  may be from about 400 microns to about 600 microns. 
     Manifold  122  may be a biocompatible material adapted to be placed in contact with tissue site  116  and distribute reduced pressure across tissue site  116 . Examples of manifold  122  may include, without limitation, devices that have structural elements arranged to form flow channels, such as, for example, cellular foam, open-cell foam, porous tissue collections, liquids, gels, and foams that include, or cure to include, flow channels. Manifold  122  may be porous and may be made from foam, gauze, felted mat, or other material suited to a particular biological application. In one embodiment, manifold  122  may be a porous foam and may include a plurality of interconnected cells or pores that act as flow channels. The porous foam may be a polyurethane, open-cell, reticulated foam such as GranuFoam® material manufactured by Kinetic Concepts, Incorporated of San Antonio, Tex. In some embodiments, manifold  122  may also be used to distribute fluids such as medications, antibacterials, growth factors, and other solutions to tissue site  116 . Other layers may be included in or on manifold  122 , such as absorptive materials, wicking materials, hydrophobic materials, and hydrophilic materials. 
     In one illustrative embodiment, manifold  122  may be constructed from bioresorbable materials that do not have to be removed from tissue site  116  following use of the system  100 . Suitable bioresorbable materials may include, without limitation, a polymeric blend of polylactic acid (PLA) and polyglycolic acid (PGA). The polymeric blend may also include, without limitation, polycarbonates, polyfumarates, and capralactones. Manifold  122  may further serve as a scaffold for new cell-growth, or a scaffold material may be used in conjunction with manifold  122  to promote cell-growth. A scaffold may be a substance or structure used to enhance or promote the growth of cells or formation of tissue, such as a three-dimensional porous structure that may provide a template for cell growth. Illustrative examples of scaffold materials include calcium phosphate, collagen, PLA/PGA, coral hydroxy apatites, carbonates, or processed allograft materials. Scaffold materials may have pore sizes that are large enough to permit ingrowth of tissue into the scaffold. In some embodiments, the pore sizes may be in an upper end of the range of pore sizes of the manifold materials described above. 
     Drape  124  at least partially covers manifold  122  if positioned over tissue site  116 , and a drape aperture  125  extends through drape  124 . Drape  124  may provide a fluid seal adequate to maintain reduced pressure at a desired site given a particular reduced-pressure source or subsystem involved. Drape  124  may be, for example, an impermeable or semi-permeable, elastomeric material. An elastomeric material generally refers to a polymeric material that may have rubber-like properties. More specifically, most elastomers may have ultimate elongations greater than 100% and a significant amount of resilience. The resilience of a material refers to the material&#39;s ability to recover from an elastic deformation. Elastomers that are relatively less resilient may also be used as these elastomers are more likely to tear if faced with a cutting element. Examples of elastomers may include, but are not limited to, natural rubbers, polyisoprene, styrene butadiene rubber, chloroprene rubber, polybutadiene, nitrile rubber, butyl rubber, ethylene propylene rubber, ethylene propylene diene monomer, chlorosulfonated polyethylene, polysulfide rubber, polyurethane (PU), EVA film, co-polyester, and silicones. Additional, specific examples of materials of drape  124  may include a silicone drape, 3M Tegaderm® drape, and a polyurethane (PU) drape such as one available from Avery Dennison Corporation of Pasadena, Calif. An additional, specific non-limiting example of a material of drape  124  may include a 30 μm matte polyurethane film such as the Inspire™ 2317 manufactured by Exopack™ Advanced Coatings of Matthews, N.C. 
     A drape adhesive  123  may be positioned between drape  124  and a portion of epidermis  118  surrounding tissue site  116  that may be intact. Drape adhesive  123  may hold drape  124  in place and fluidly seal drape  124  to epidermis  118  surrounding tissue site  116 . Fluidly sealing drape  124  to epidermis  118  may refer to sealing of drape  124  to epidermis  118  so that fluid may be inhibited from passing between drape  124  and epidermis  118 . Drape adhesive  123  may include another layer such as, for example, a gasket or additional sealing member. Drape adhesive  123  may take numerous forms. For example, in some embodiments, drape adhesive  123  may be a medically acceptable adhesive, such as a pressure-sensitive adhesive, that extends about a portion of, a periphery of, or about all of drape  124 . In other embodiments, drape adhesive  123  may be a double-sided drape tape, a paste, a hydrocolloid, a hydro-gel, a silicone gel, an organogel, or other sealing devices or elements. Drape adhesive  123  may also be a sealing ring or other device. In still another example, drape adhesive  123  may be a releasable adhesive material capable of being removed from tissue site  116  and reapplied to tissue site  116 . Before use, drape adhesive  123  may be covered by a release liner (not shown) to protect the drape adhesive  123  before being applied to tissue site  116 . 
     Connector  126  may include a flange  130 , a primary connector lumen  132 , and a secondary connector lumen  134 . Flange  130  may be a base member or other suitable device configured to couple connector  126  to another body, such as manifold  122  or drape  124 . In some embodiments, connector  126  may be a disc-like member having a first side and a second side. In one illustrative embodiment, connector  126  may be a T.R.A.C.® Pad or Sensa T.R.A.C.® Pad available from KCl of San Antonio, Tex. Connector  126  may allow the reduced pressure to be delivered to the dressing  106 . In other exemplary embodiments, connector  126  may also be a conduit inserted through drape  124 . 
     Connector  126  may be used to fluidly couple first conduit  128  to tissue site  116 . In some embodiments, flange  130  may couple connector  126  to manifold  122  as shown. In other embodiments, flange  130  may include a flange adhesive applied to a surface of flange  130  so that flange  130  may couple connector  126  to drape  124 . Flange  130  may be disposed between drape  124  and manifold  122  as shown, or in another embodiment, flange  130  may be disposed on drape  124  opposite manifold  122 . In some embodiments, primary connector lumen  132  may receive reduced pressure through first conduit  128  and may supply reduced pressure to manifold  122 . In some embodiments, secondary connector lumen  134  may be a sensing lumen configured to communicate reduced pressure at manifold  122  to an instrumentation unit to determine the pressure at manifold  122 . In some embodiments, the instrumentation unit may be therapy unit  108 . 
     As used herein, the term “coupled” may include direct coupling or indirect coupling via a separate object. The term “coupled” also encompasses two or more components that are continuous with one another by virtue of each of the components being formed from the same piece of material. Also, the term “coupled” may include chemical, such as via a chemical bond, mechanical, thermal, or electrical coupling. Fluid coupling may include coupling that may permit fluid to be in communication between designated parts or locations. Pneumatic coupling may mean, in part, that gas or gas pressure may be in communication between the designated parts or locations. 
     Dressing  106  may be operable to receive fluids from, or supply fluids to, tissue site  116 . Dressing  106  may also be a device that collects liquids whether tissue site  116  may be involved or not. In some embodiments, dressing  106  may be a device for removing liquids from an ostomy bag. 
     First conduit  128  may include more than one lumen, such as a primary lumen  136 , and a secondary lumen  138 . First conduit  128  may have different shapes and include more or fewer primary lumens  136  and secondary lumens  138 . Primary lumen  136  may deliver reduced pressure, and secondary lumen  138  may function as a sensing lumen, for example. If first conduit  128  is coupled to connector  126 , primary lumen  136  may be in fluid communication with primary connector lumen  132 , and secondary lumen  138  may be in fluid communication with secondary connector lumen  134 . As primary lumen  136  may provide reduced pressure to the tissue site  116 , exudates and other fluids may be drawn through primary connector lumen  132  and into primary lumen  136 . Hence, secondary lumen  138  may be configured to be fluidly isolated from primary lumen  136  so as not to interfere with the process of sensing the pressure. 
     Pouch  104  may include a side  140  and a side  142  ( FIG. 4A ). Pouch  104  may also include a port  144 , a port  146 , and a bypass conduit  148  (shown in hidden lines). In some embodiments, port  144  may be coupled to side  140  of pouch  104 . In other embodiments, port  144  may be coupled to side  142  of pouch  104 . Similarly, port  146  may be coupled to side  140  of pouch  104 , as shown in  FIG. 2 . In other embodiments, port  146  may be coupled to side  142  of pouch  104 . Port  144  and port  146  may be formed on the same side of pouch  104  as shown or may be formed on opposite sides of pouch  104 . In some embodiments, port  144  and port  146  may be disposed adjacent to opposite ends of pouch  104 . In other embodiments, both port  144  and port  146  may be disposed adjacent the same end. In still further embodiments, port  144  and port  146  may be disposed at other locations of pouch  104 . Port  144  may be a device that allows for fluid communication with an interior of pouch  104 . Port  144  may provide fluid communication across an outer boundary of pouch  104 . In some embodiments, port  144  may include two flow channels that fluidly communicate across a wall of pouch  104 . First conduit  128  may be configured to couple to port  144  so that primary lumen  137  and secondary lumen  138  may maintain fluid isolation if coupled to port  144 . 
     In some embodiments, bypass conduit  148  may be a single lumen conduit configured to fluidly couple port  144  and port  146  through the interior of pouch  104 . In other embodiments, bypass conduit  148  may include multiple lumens each fluidly coupled to port  144  and port  146 . Bypass conduit  148  may be formed in the interior of pouch  104  and may be fluidly isolated from the interior of pouch  104 . In some embodiments, bypass conduit  148  may function as a sensing lumen to be fluidly coupled to secondary lumen  138  through port  144 . Bypass conduit  148  may also be formed from a portion of pouch  104  that may be fluidly isolated from adjacent portions of pouch  104 . 
     In some embodiments, first conduit  128  may fluidly couple to port  144 . Port  144  may be adapted to receive a single lumen or may be adapted to receive multiple lumens as shown. In some embodiments, port  144  may fluidly couple primary lumen  136  of first conduit  128  to the interior of pouch  104 . Port  144  may also fluidly couple secondary lumen  138  of first conduit  128  to bypass conduit  148 . 
     Second conduit  150  may include more than one lumen, such as a primary lumen  152  and a secondary lumen  154 . Primary lumen  152  may deliver reduced pressure, and secondary lumen  154  may function as a sensing lumen, for example. If second conduit  150  is coupled to port  146 , primary lumen  152  may be in fluid communication with the interior of pouch  104 , and secondary lumen  154  may be in fluid communication with bypass conduit  148 . As primary lumen  152  may provide reduced pressure to pouch  104 , exudates and other fluids may be drawn through primary lumen  152 . Secondary lumen  154  may be configured to be fluidly isolated from primary lumen  152  so as not to interfere with the process of sensing the pressure. 
     Port  146  may be a device that allows for fluid communication with the interior of pouch  104 . Port  146  may provide fluid communication across an exterior boundary of pouch  104 . In some embodiments, port  146  may include two flow channels that fluidly communicate across an exterior boundary of pouch  104 . Second conduit  150  may be configured to couple to port  146  so that primary lumen  152  and secondary lumen  154  may maintain fluid isolation from each other if coupled to port  146 . Port  146  may receive reduced pressure through primary lumen  152  of second conduit  150 , creating a pressure gradient within the interior of pouch  104 . The pressure gradient may move fluids from port  144  to port  146 . The fluid can be distributed throughout the interior of pouch  104  as the reduced pressure draws from port  146 . 
     Therapy unit  108  may include a reduced-pressure source  156 , a pressure sensing unit  158 , and one or more pressure sensors  160 . Reduced-pressure source  156  may be housed within or used in conjunction with the therapy unit  108 . In some embodiments, reduced-pressure source  156  may be an electrically-driven vacuum pump. In other illustrative embodiments, reduced-pressure source  156  may be a manually-actuated or manually-charged pump that does not require electrical power. Reduced-pressure source  156  may be other types of reduced pressure pumps, or may be a wall suction port such as those available in hospitals and other medical facilities. Pressure sensing unit  158  may be in fluid communication with reduced-pressure source  156 . Pressure sensing unit  158  may include a microprocessor adapted to process pressure signals, monitor pressure signals, and issue alerts according to a pre-determined pressure therapy for a patient. The pre-determined pressure therapy may include a pressure profile of desired target pressures to be provided to a patient over a time period. The pressure profile may include a set-up profile applying target pressures at the commencement of therapy treatments and a maintenance profile for applying target pressure during therapy. Pressure sensing unit  158  may include sensors, processing units, alarm indicators, memory, databases, software, display units, and user interfaces that further facilitate the application of reduced pressure treatment to the tissue site  116 . 
     In some illustrative embodiments, pressure sensors  160  located in therapy unit  108  may be disposed at or near reduced-pressure source  156 . In other illustrative embodiments, pressure sensors  160  may be one or more transducers located in connector  126 . Pressure sensors  160  may include an electrical interface (not shown) that can provide the pressure signal measured at or near reduced-pressure source  156 . The pressure signal may provide an indication of the pressure between the connector  126  and the manifold  122 . The pressure sensors  160  may communicate with pressure sensing unit  158  to monitor and control reduced-pressure source  156 . In some illustrative embodiments, pressure sensors  160  may communicate with pressure sensing unit  158  to monitor whether the pressure signal is following the pressure set-up profile. The pressure set-up profile may include an expected increase in the reduced pressure during a predetermined time period detected at the tissue site  116  following initial application of reduced pressure. If the pressure signal does not follow the pressure set-up profile, pressure sensing unit  158  may provide an indication that the pressure signal did not follow the pressure set-up profile. In some embodiments, the indication may be in the form of a visual or audible alert or alarm, for example. If the pressure signal is following the pressure set-up profile, pressure sensing unit  158  may provide an indication that the pressure signal followed the pressure set-up profile. The indication that the pressure set-up profile has been followed may be different than the indication that the pressure set-up profile has not been followed. 
       FIGS. 3A and 3B  are perspective views, illustrating additional details that may be associated with some embodiments of the pouch  104 .  FIG. 4A  is a cross-sectional view taken along line  4 A- 4 A of  FIG. 3A , illustrating additional details that may be associated with some embodiments of the pouch  104 , and  FIG. 4B  is a detail view, illustrating additional details of an alternative portion of the pouch  104  that may be associated with some embodiments. Pouch  104  may be formed with an outer wall  164 , an outer wall  162 , and a partition wall  166 . Outer wall  162  and outer wall  164  may be coupled, such as by welding or the like, on peripheral portions of outer wall  162  and outer wall  164  to form pouch  104  having aninterior. As shown in the cross sectional view of  FIG. 4A , partition wall  166  may extend from peripheral portions of outer wall  162  and outer wall  164  through the interior to separate the interior into a chamber  168  and a chamber  170 . Outer wall  162 , outer wall  164 , and partition wall  166  may be formed from a liquid impermeable material to prevent liquids within the chamber  168  and the chamber  170  from exiting pouch  104  or communicating through partition wall  166  except as described herein. In some embodiments, the liquid-impermeable material may be formed from the same material used to form the drape  124 . In addition, outer wall  164 , outer wall  162 , and partition wall  166  may be formed from a gas-impermeable material to prevent gas within the chamber  168  and the chamber  170  from exiting pouch  104  or communicating through partition wall  166  except as described herein. Chamber  168  and chamber  170  may generally be fluidly isolated from each other by partition wall  166  except as described in more detail below. 
     In some embodiments, side  140  may be formed by outer wall  164  so that chamber  170  may be proximate to side  140 . Similarly, side  142  may be formed by outer wall  162  so that chamber  168  may be proximate to side  142 . As shown in  FIG. 3A , port  144  and port  146  may be disposed on side  140 . As shown in  FIG. 4A , port  144  may be in fluid communication with chamber  168 , and port  146  may be in fluid communication with chamber  170 . Port  144  and port  146  may also both be located on side  142 , or port  144  and port  146  may be disposed on opposite sides of pouch  104 . In other embodiments, port  144  and port  146  may be located on pouch  104  in non-peripheral portions of pouch  104 , for example, as shown in  FIG. 3B . 
     In some embodiments, chamber  168  may form a fluid storage volume configured to receive and store fluid, for example, from tissue site  116 . Chamber  168  may be larger than chamber  170 . In some embodiments, a manifold  172  may be disposed within chamber  168 . In some embodiments, manifold  172  may be positioned adjacent to outer wall  162  and may span chamber  168 . In some embodiments, manifold  172  may be separated from outer wall  162 . In other embodiments, manifold  172  may be coupled to outer wall  162  so that manifold  172  may remain in position if pouch  104  is moved, folded, or otherwise disturbed from the orientation illustrated in  FIG. 4A . Manifold  172  may be configured to allow passage of, or to channel, fluid through manifold  172 . Manifold  172  may provide a flow passage across the interior of chamber  168 . In some illustrative embodiments, manifold  172  may be formed from Libeltex TDL2 having a material weight of 80 grams per square member (gsm). In other embodiments, manifold  172  may have a material weight between about 20 gsm and about 140 gsm. Larger material weights may be selected to increase the manifolding properties and the fluid capacity of the manifold  172 . Other materials may be used to form manifold  172 , such as, woven and non-woven materials, fibrous materials, non-woven Freudenberg M1545N or M1550, non-woven Texsus Multitex, and other similar materials. 
     An absorbent  174  may be disposed within chamber  168 . Absorbent  174  may be disposed proximate to a surface of manifold  172  opposite outer wall  162  so that absorbent  174  may be partially enclosed by manifold  172 . In some embodiments, absorbent  174  may be dimensioned to be coextensive with manifold  172 . In other embodiments, absorbent  174  may be dimensioned to be slightly smaller than manifold  172  so that manifold  172  may extend past absorbent  174 . Absorbent  174  may be coupled to manifold  172  so that absorbent  174  may remain in position in the event that pouch  104  is moved, folded, or otherwise disturbed from the orientation illustrated in  FIG. 4A . Absorbent  174  may be coupled by welding, bonding, or securing with an adhesive, for example. In an illustrative embodiment, absorbent  174  may be BASF Luquafleece  402 C. Other materials may be used to form absorbent  174 , for example, super absorbent polymers disposed on woven and non-woven substrates, fibrous materials, non-woven TAL superabsorbent fiber, non-woven Texsus Absortex, and the like. Absorbent  174  may be configured to absorb liquid, for example, from tissue site  116 . 
     In some embodiments, a manifold  176  may be disposed within chamber  168 . In some embodiments, manifold  176  may be positioned adjacent to partition wall  166  and may span chamber  168  between partition wall  166  and absorbent  174 . In some embodiments, manifold  176  may be separated from partition wall  166 . In some embodiments, manifold  176  may be coupled to partition wall  166  so that manifold  176  may remain in position in the event that pouch  104  is moved, folded, or otherwise disturbed from the orientation illustrated in  FIG. 4A . Similarly, manifold  176  may be coupled to absorbent  174 , for example, by bonding, welding, or securing with an adhesive. 
     Manifold  176  may be configured to channel fluid through or allow passage of fluid through manifold  176 . Manifold  176  may provide a flow passage within chamber  168  adjacent to partition wall  166 . In some illustrative embodiments, manifold  176  may be formed from Libeltex TDL2 having a material weight of 80 gsm. In other embodiments, manifold  176  may have a material weight between about 20 gsm and about 140 gsm. Larger material weights may be selected to increase the manifolding properties and the fluid capacity potential of the manifold  176 . Other materials may be used to form manifold  176 , for example, woven and non-woven materials, fibrous materials, non woven Freudenberg M1545N or M1550, non-woven Texsus Multitex, and other similar materials. 
     In some illustrative embodiments, manifold  172  may be coupled to manifold  176  at peripheral portions  178  of manifold  172  and manifold  176 . Coupling of manifold  172  and manifold  176  may enclose absorbent  174  within a cavity  180  formed by manifold  172  and manifold  176 . Enclosing absorbent  174  within manifold  172  and manifold  176  can provide flow channels or fluid passages around absorbent  174  so that fluid entering chamber  168  may flow freely if not absorbed by absorbent  174 . Fluid within chamber  168  may flow through manifold  172  and manifold  176  to interact with, be absorbed by, and be stored within absorbent  174 . In addition, reduced pressure supplied to chamber  168  may flow through manifold  172  and manifold  176  unhindered by absorbent  174 . In some embodiments, manifold  172 , manifold  176 , and absorbent  174  may substantially fill chamber  168 . In other embodiments, chamber  168  may include only one of manifold  172  and manifold  176 . 
     In some embodiments, chamber  170  may include a manifold  182  disposed therein. Chamber  170  may be smaller than chamber  168 . In some embodiments, manifold  182  may be positioned adjacent to outer wall  164  and may span chamber  170 . In some embodiments, manifold  182  may be separated from outer wall  164 . In some embodiments, manifold  182  may be coupled to outer wall  164  so that manifold  182  may remain in position in the event that pouch  104  is moved, folded, or otherwise disturbed from the orientation illustrated in  FIG. 4A . In other embodiments, manifold  182  may be coupled to both outer wall  164  and partition wall  166 . Manifold  182  may be configured to allow passage of or to channel fluid through manifold  182 . Manifold  182  may provide a flow passage through chamber  170 . In some illustrative embodiments, manifold  182  may be formed from Libeltex TDL2 having a material weight of 80 gsm, although other, similar, materials may be used to form manifold  182 . For example, woven and non-woven materials, fibrous materials, non-woven Freudenberg M1545N or M1550, non-woven Texsus Multitex, and other similar materials may be suitable for some embodiments of manifold  182 . In other embodiments, manifold  182  may have a material weight between about 20 gsm and about 140 gsm. Larger material weights may be selected to increase the manifolding properties and the fluid capacity of the manifold  182 . 
     Pouch  104  may include one or more air bridges, such as filter assemblies  184 . In some embodiments air bridges may be fluid passageways through the partition wall  166  that provide for fluid communication between the chamber  168  and the chamber  170 . An air bridge may include a liquid barrier, as described below with respect to filter assemblies  184 . Two filter assemblies  184  are shown in  FIG. 4A , although more or fewer filter assemblies  184  may be used. In some embodiments, a filter assembly  184  may be disposed at each end of pouch  104  proximate to port  144  and port  146 , respectively. A filter assembly  184  may be positioned between opposite ends of the pouch  104 , for example, near a middle portion of pouch  104 . Each filter assembly  184  may be coupled to partition wall  166  and configured to provide a fluid passage across partition wall  166  as described in more detail below. 
       FIG. 5A  and  FIG. 5B  are exploded views, illustrating additional details that may be associated with some embodiments of the pouch  104 .  FIG. 6  is a schematic diagram, illustrating additional details that may be associated with some embodiments of the pouch  104 . Referring to  FIG. 5A , pouch  104  may include five filter assemblies  184 . A first filter assembly  185  may be positioned in a corner of pouch  104  proximate to port  146 . A second filter assembly  186  may be positioned on a same end but in an adjacent corner of pouch  104 . A third filter assembly  189  may be positioned near a middle portion of pouch  104 . In some embodiments, third filter assembly  189  may be equidistantly spaced from each end of pouch  104  and each lateral edge of pouch  104 . In other embodiments, third filter assembly  189  may be positioned in other locations. A fourth filter assembly  191  may be positioned in a corner of pouch  104  proximate to port  144 . A fifth filter assembly  193  may be opposite fourth filter assembly  191 . As shown in  FIG. 5A , each filter assembly  185 ,  186 ,  189 ,  191 , and  193  may be a single filter disposed in the partition wall  166 . The filters may be hydrophobic filters so that fluid communication may be limited to communication of reduced pressure, preventing liquid from flowing across partition wall  166 . Generally, filters may inhibit liquids from crossing partition wall  166  between chamber  168  and chamber  170 . Each filter assembly  185 ,  186 ,  189 ,  191 , and  193  may be positioned adjacent to an aperture  196  in partition wall  166 . Aperture  196  may permit fluid communication across partition wall  166 . 
     As shown in  FIG. 5B , each filter assembly  185 ,  186 ,  189 ,  191 , and  193  can also include a first filter  188 , a filter manifold  190 , a second filter  192 , and a filter cap  194 . First filter  188  may be positioned between manifold  176  and partition wall  166 , proximate to aperture  196  in partition wall  166 . First filter  188  and second filter  192  may cover aperture  196  so that fluid passing between chamber  168  and chamber  170  through aperture  196  may flow through first filter  188  and second filter  192 . First filter  188  and second filter  192  may be primary filters and may be hydrophobic filters so that fluid communication may be limited to communication of reduced pressure, preventing liquid from flowing across partition wall  166 . Generally, first filter  188  and second filter  192  may inhibit liquids from crossing partition wall  166  between chamber  168  and chamber  170 . In some embodiments, filter manifold  190  may be a manifold having a size and shape to substantially fill aperture  196 . Filter manifold  190  may be formed of a material similar to the material of manifold  172 , manifold  176 , or manifold  182 . Filter manifold  190  may be used to separate first filter  188  and second filter  192  and provide flow channels across partition wall  166 . Some embodiments may not include the filter manifold  190 . Filter cap  194  may be a polyurethane cap having an aperture to allow fluid communication across filter cap  194 . Filter cap  194  may be used to secure second filter  192  and filter manifold  190  to partition wall  166 . A charcoal filter or other odor filter may be included in filter assembly  184 . 
     As shown in  FIGS. 5A and 5B , outer wall  164  may include an aperture  198  configured to allow a connector of port  146  to extend through outer wall  164  for coupling to second conduit  150  ( FIG. 2 ). Aperture  198  may be sized to be substantially similar to the dimensions of the connector of port  146  and may seal to the connector of port  146  to prevent leaks from pouch  104  around port  146 . Aperture  198  may include more than one apertures, for example, may include at least two apertures to accommodate a connector for primary lumen  152  of second conduit  150  and a connector for secondary lumen  154  of second conduit  150 . By coupling second conduit  150  to port  146 , reduced pressure supplied by reduced pressure source  156  ( FIG. 2 ) may be supplied to chamber  170 . Port  146  may be in direct fluid communication with chamber  170  so that primary lumen  152  of second conduit  150  terminates in chamber  170  to supply reduced pressure thereto. A secondary filter  207  may be positioned adjacent to port  146  and between outer wall  164  and manifold  182  so that fluid flowing from chamber  170  into port  146  passes through secondary filter  207 . Secondary filter  207  may also include a charcoal filter. 
     Similarly, outer wall  164  may include an aperture  200  configured to allow a connector of port  144  to extend through outer wall  164  for coupling with first conduit  128  ( FIG. 2 ). Aperture  200  may be sized to be substantially similar to the dimensions of the connector of port  144  and may seal to the connector of port  144  to prevent leaks from pouch  104  around port  144 . Aperture  200  may include more than one aperture, for example, aperture  200  may include at least two apertures to accommodate a connector for primary lumen  136  of first conduit  128  and a connector for secondary lumen  138  of first conduit  128 . In embodiments where port  144  is positioned on side  140  of pouch  104  adjacent to chamber  170 , port  144  may include a penetrating lumen  202  having a length such that penetrating lumen  202  may extend into chamber  168 . Manifold  182  may include an aperture  204 , and partition wall  166  may include an aperture  206  configured to accommodate and seal to penetrating lumen  202 . In some embodiments, penetrating lumen  202  may be fluidly isolated from chamber  170 . Penetrating lumen  202  may be configured to allow fluid communication between first conduit  128  and chamber  168  through port  144 . First conduit  128  may be coupled to port  144 , which may also be fluidly coupled to primary lumen  136  to chamber  168  and penetrating lumen  202 . Bypass conduit  148  ( FIG. 2 ), may couple to port  144  and port  146  while passing through chamber  170  to fluidly couple secondary lumen  138  of first conduit  128  to secondary lumen  154  of second conduit  150 . 
     As shown in  FIG. 4B , in an alternative embodiment, port  144  and port  146  may be a combined port  147  having a lumen  149  for fluidly connecting chamber  168  to tissue site  116 . Combined port  147  may also include a lumen  151  for fluidly connecting chamber  170  to therapy unit  108 . Combined port  147  may also include bypass conduit  148 . Both lumen  149  and lumen  151  may provide fluid communication into pouch  104 . Bypass conduit  148  may be disposed on a portion of combined port  147  exterior to pouch  104 , allowing pressure sensing functions of therapy unit  108  to bypass pouch  104 . Combined port  147  reduces the number of penetrations into pouch  104  reducing the risk of leak formation. 
       FIG. 6  is a schematic diagram of pouch  104  illustrating, among other things, fluid flow through pouch  104 . As shown schematically in  FIG. 6 , pouch  104  may include chamber  168  and chamber  170  separated by partition wall  166 , which may be common to chamber  168  and chamber  170 . Manifold  172  and manifold  176  may be disposed within chamber  168 , and manifold  182  may be disposed within chamber  170 . Absorbent  174  may be disposed between manifold  172  and manifold  176  in chamber  168 . In some embodiments, chamber  168  may not include manifold  172 , and absorbent  174  may be disposed proximate to manifold  176 . Air bridges  181  may fluidly couple manifold  176  and manifold  182  at extremities of manifold  176  and manifold  182 . In some embodiments, air bridges  181  may be gas permeable liquid barriers. Port  144  may fluidly couple to manifold  176 , and in some embodiments, port  144  may fluidly couple to manifold  176  and manifold  172  in chamber  168 . Port  144  may couple manifold  176  and manifold  172  to a dressing, such as dressing  106  of  FIG. 2 . Port  146  may fluidly couple manifold  182  in chamber  170  to a reduced-pressure source, such as reduced-pressure source  156  of  FIG. 2 . 
     Reduced pressure may be supplied to pouch  104  and manifold  182  through port  146 , drawing fluid through port  146  as indicated by flow arrow  208 . Reduced pressure may be supplied through manifold  182 , drawing fluid through manifold  182  as indicated by flow arrow  210 . Reduced pressure may be supplied to manifold  176  and manifold  172  of chamber  168  through air bridges  181 , drawing fluid through air bridges  181  as indicated by flow arrows  212 . Reduced pressure may be supplied to port  144  through manifold  176  and manifold  172  of chamber  168 , drawing fluid through port  144  as indicated by flow arrow  214 . As shown, air bridges  181  may provide for fluid communication at more than one location of partition wall  166 . Manifold  182  may provide flow channels within chamber  170  to allow the reduced pressure supplied through port  146  to flow to each air bridge  181 . Manifold  182  may also prevent collapse of chamber  170  if reduced pressure is supplied to chamber  170 . By maintaining a flow channel to each air bridge  181  with manifold  182 , manifold  182  may distribute reduced pressure from port  146  to multiple locations of chamber  168 . 
     Pouch  104  may include more than one filter assembly  184 . In the illustrative embodiment of  FIGS. 5A, 5B, and 7 , five filter assemblies  185 ,  186 ,  189 ,  191 , and  193  are shown. In some embodiments, a filter assembly  185 ,  186  may be placed on opposite corners proximate to port  146 . In some embodiments, a filter assembly  189  may be placed proximate to a center portion of pouch  104 , and a filter assembly  191 ,  193  may be placed on opposite corners proximate to port  144 . Generally, if reduced pressure is applied to pouch  104  through port  146 , the force of the reduced pressure may be strongest proximate port  146 , so that fluid flow may be greater through filter assemblies  185 ,  186  closer to port  146  than through filter assemblies  191 ,  193  closer to port  144 . If chamber  168  is empty, supply of reduced pressure through port  146  may draw liquid from tissue site  116  through port  144  and into chamber  168 . As the force of reduced pressure may be strongest proximate to port  146 , the liquid may be drawn to and stored in absorbent  174  proximate to filter assemblies  185 ,  186  closer to port  146 . Continued application of reduced pressure may draw more fluid into chamber  168  until the absorbent  174  proximate to port  146  may be saturated, which can cause liquid from tissue site  116  to begin to block flow of reduced pressure through filter assemblies  185 ,  186  proximate to port  146 . Each filter assembly  185 ,  186 ,  189 ,  191 , and  193  may prevent passage of liquid across partition wall  166  while permitting the flow of reduced pressure across partition wall  166 . 
     If flow is blocked through filter assemblies  185 ,  186  proximate to the port  146 , reduced pressure may be supplied through port  146  to manifold  182 . Manifold  182  may distribute reduced pressure to chamber  168  through filter assemblies  189 ,  191 , and  193  that may be unblocked by liquids in the absorbent  174 . Reduced pressure flowing through filter assemblies  189 ,  191 , and  193  may continue to draw liquid through port  144  into chamber  168 , continuing to fill chamber  168 . As chamber  168  continues to fill, filter assembly  189  may become blocked by liquid. Eventually, continued application of reduced pressure may draw sufficient fluid through port  144  to fill chamber  168 , blocking all filter assemblies  185 ,  186 ,  189 ,  191 , and  193  with liquid. At this stage, a new pouch  104  may be required for continued application of reduced pressure to tissue site  116 . 
       FIG. 8  illustrates another embodiment of pouch  104  having four filter assemblies  185 ,  186 ,  191 , and  193  positioned in extremities of the pouch  104 . For example, one filter assembly  185 ,  186 ,  191 , and  193  may be positioned in each corner of pouch  104 .  FIGS. 9-12  illustrate another embodiment of pouch  104  having three filter assemblies  220 ,  222 , and  224  placed in three extremities of pouch  104 . For example, the filter assemblies  220 ,  222 , and  224  may be positioned in three corners of pouch  104 . As shown by  FIGS. 8-12 , pouch  104  may be oriented so that filter assemblies  185 ,  186 ,  191 , and  193 , or filter assemblies  220 ,  222 , and  224  may be supplied with reduced pressure through chamber  170 . In some embodiments of  FIG. 8 , chamber  170  may not extend the entirety of pouch  104 . Chamber  170  extends from an outer periphery of the pouch  104  to a channel wall  218  so that fluid may be channeled from port  146  around a perimeter of pouch  104  to each filter assembly  185 ,  186 ,  191 , and  193 . In some embodiments, chamber  170  may be four adjoining cavities extending along a periphery of the pouch  104 , bounded by channel wall  218 . The adjoining cavities may form four extremities at each corner of pouch  104 , for example. In  FIGS. 9-12 , chamber  170  may have an L-shape formed by two adjoining cavities that extend orthogonally along two sides of pouch  104 , bounded by channel wall  218 . The two adjoining cavities form three extremities, an extremity at each corner of the L-shape formed by chamber  170 , for example. In each embodiment, chamber  170  may provide a flow passage to each filter assembly  220 ,  222 , and  224 , but chamber  170  may not be coextensive with chamber  168 . 
     Chamber  170  and filter assemblies  184  may permit orientation of pouch  104  in a variety of manners without inhibiting the ability of pouch  104  to substantially fill. Referring to  FIGS. 9-12 , each pouch  104  may include three filter assemblies  220 ,  222 , and  224 . In each of  FIGS. 9-10 , the ground, or a position of lower relative elevation may be oriented parallel to the bottom of the page. As shown in  FIG. 9 , pouch  104  may be oriented so that a lateral edge is parallel to the ground and port  144  may be proximate to the ground. As pouch  104  fills with liquid, chamber  168  may fill so that filter assembly  220  may be blocked prior to filter assemblies  222  and  224 . In the orientation of  FIG. 9 , reduced pressure may continue to be supplied to chamber  168  until a liquid level  216  reaches filter assemblies  222  and  224 , at which point chamber  168  may be substantially filled. As shown in  FIG. 10 , pouch  104  may be oriented so that a lateral edge is parallel to the ground and port  146  may be proximate to the ground. As pouch  104  fills with liquid, chamber  168  may fill so that filter assembly  222  and filter assembly  224  may be blocked prior to filter assembly  220 . In the orientation of  FIG. 10 , reduced pressure may continue to be supplied to chamber  168  until liquid level  216  reaches filter assembly  220 , at which point chamber  168  may be substantially filled. As shown in  FIG. 11 , pouch  104  may be oriented so that an end is parallel to the ground and second port  146  may be proximate to the ground. As pouch  104  fills with liquid, chamber  168  may fill so that filter assembly  220  and filter assembly  222  may be blocked prior to filter assembly  224 . In the orientation of  FIG. 11 , reduced pressure may continue to be supplied to chamber  168  until liquid level  216  reaches filter assembly  224 , at which point chamber  168  may be substantially filled. As shown in  FIG. 12 , pouch  104  may be oriented so that an end may be parallel to the ground and port  144  is proximate to the ground. As pouch  104  fills with liquid, chamber  168  may fill so that filter assembly  224  may be blocked prior to filter assembly  220  and filter assembly  222 . In the orientation of  FIG. 12 , reduced pressure may continue to be supplied to chamber  168  until liquid level  216  reaches filter assembly  220  and filter assembly  222 , at which point chamber  168  may be substantially filled. Pouch  104  may also be oriented so that an edge may be not parallel to the ground. In each orientation, a filter assembly  220 ,  222 , and  224  may be positioned to allow continued supply of reduced pressure to chamber  168  until chamber  168  may be substantially filled. 
     Although illustrated as a rectangular body herein, pouch  104  may have other suitable shapes, such as circular, triangular, square, or an amorphous shape. Other shaped pouches  104  may also include air bridges  181  disposed at desired locations to allow for substantial filling of the corresponding fluid storage volume, such as chamber  168 . 
     The systems and methods described herein may provide significant advantages, some of which have already been mentioned. For example, pouch  104  may provide a multi-orientation flexible canister. The flexible canister can manifold fluid from multiple points around the canister using air bridges. The air bridges may allow flow of fluid and air even if one or more of the air bridges is blocked, and application of reduced pressure can continue until all air bridges are blocked. In this manner, the flexible canister can fill to its full capacity in multiple orientations. Air bridges located in each corner of the pouch  104  and one positioned centrally may provide for more orientations of the pouch  104 , allowing a curved profile, such as a saddle profile of fluid filling. 
     Although certain illustrative, non-limiting embodiments have been presented, it should be understood that various changes, substitutions, permutations, and alterations can be made without departing from the scope the appended claims. It will be appreciated that any feature that is described in connection to any one embodiment may also be applicable to any other embodiment. 
     It will be understood that the benefits and advantages described above may relate to one embodiment or may relate to several embodiments. It will further be understood that reference to “an” item refers to one or more of those items. 
     The steps of the methods described herein may be carried out in any suitable order, or simultaneously where appropriate. 
     Where appropriate, features of any of the embodiments described above may be combined with features of any of the other embodiments described to form further examples having comparable or different properties and addressing the same or different problems. 
     It will be understood that the above description of preferred embodiments is given by way of example only and that various modifications may be made by those skilled in the art. The above specification, examples and data provide a complete description of the structure and use of exemplary embodiments of the invention. Although various embodiments of the invention have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of the claims.