Patent Publication Number: US-2021186651-A1

Title: Indwelling device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This is a Continuation of International Application No. PCT/JP2018/033572 filed Sep. 11, 2018. The disclosure of the prior application is hereby incorporated by reference herein in its entirety. 
    
    
     TECHNICAL FIELD 
     The disclosed embodiments relate to an indwelling device that is placed in a patient&#39;s body lumen, such as a bronchus of a lung and a blood vessel in a patient. 
     BACKGROUND 
     In conventional surgery or the like, a technique, so-called RFID (radio frequency identifier) has been used, in which a wireless marker is embedded in or near a patient&#39;s lesion, and a position of the patient&#39;s lesion is specified by wireless communication between the wireless marker and a device outside of the patient&#39;s body. 
     For example, Japanese Unexamined Patent Application Publication No. 2013-543401 describes that a wireless marker is embedded in a lesion in a bronchus of a patient&#39;s lung, and, during surgery or the like, a position of a lesion is informed to an operator in real time by wireless communication between a position-specifying system outside of the patient&#39;s body and the wireless marker (see  FIG. 8  and the like). 
     In addition, the wireless marker used for this position-specifying system includes a leg (hereinafter referred to as “engagement part”) as a mechanism for the wireless marker to be fixed inside the patient&#39;s body (see  FIG. 13  and the like). [0006] However, the conventional wireless marker has had a problem that a hook-shaped proximal end part of an engaging part is likely to damage a patient&#39;s bodily wall. 
     In addition, the conventional wireless marker has had a problem that, due to a relationship between a shape of a wireless marker body and a shape of the engaging part, the wireless marker is likely to occlude a patient&#39;s body lumen when disposing the wireless marker in the patient&#39;s body lumen. 
     Also, the conventional wireless marker has had a problem that the wireless marker is difficult to insert into a catheter lumen and also difficult to carry thereafter because the engaging part is disposed so as to project from a proximal end of the wireless marker toward the proximal end side. 
     Furthermore, the conventional wireless marker has had a problem that, since the engaging part is disposed on the proximal end part of the wireless marker, it is not until the whole wireless marker leaves from a distal end of a catheter for conveying the wireless marker that the wireless marker engages with the patient&#39;s body lumen, and therefore the wireless marker cannot be swiftly disposed in the patient&#39;s body lumen. 
     The disclosed embodiments have been made in response to the aforementioned problems, and objects of the disclosed embodiments are to provide an indwelling device that does not occlude an inside of a body and does not damage a patient&#39;s bodily wall, and to provide an indwelling device that can be easily accommodated in a lumen such as a catheter and improves deliverability of the indwelling device, and further to provide an indwelling device that has an engaging part capable of swiftly abutting on the bodily wall and consequently can be swiftly placed in the body. 
     SUMMARY 
     In order to solve the aforementioned problems, the first aspect of the disclosed embodiments is characterized in that, in an indwelling device including a device body and an engaging part connected to the device body and capable of abutting on a bodily wall, the engaging part can abut on the bodily wall in a state that a region of the engaging part, excluding end parts, is expanded radially outward from an outer peripheral surface of the device body. 
     In addition, the second aspect of the disclosed embodiments is characterized in that, in the indwelling device according to the first aspect, the device body has a small-diameter part having an outer diameter smaller than of other regions, and the engaging part can be stored on the small-diameter part. 
     In addition, the third aspect of the disclosed embodiments is characterized in that, in the indwelling device according to the first or second aspect, the engaging part is constructed by spirally winding one or more wires. 
     Furthermore, the fourth aspect of the disclosed embodiments is characterized in that, in the indwelling device according to the third aspect, an end part of the wire on a side not connected to the device body is located on a distal end side in an advancing direction of the indwelling device while being placed in a body. 
     Effect of the Disclosed Embodiments 
     According to the first aspect of the disclosed embodiments, in the indwelling device including the device body and the engaging part connected to the device body and capable of abutting on the bodily wall, the engaging part can abut on the bodily wall in a state that the region of the engaging part excluding the end parts is expanded radially outward from an outer peripheral surface of the device body, and therefore the indwelling device can be securely placed in the body without occluding the inside of the body and damaging the patient&#39;s bodily wall. 
     In addition, according to the second aspect of the disclosed embodiments, in the indwelling device according to the first aspect, the device body has the small-diameter part having the outer diameter smaller than of other regions, and the engaging part can be stored on the small-diameter part, so that not only is the effect of the indwelling device according to the first aspect obtained but the indwelling device also becomes easier to accommodate in a lumen such as a catheter, and deliverability of the indwelling device can be improved. 
     In addition, according to the third aspect of the disclosed embodiments, in the indwelling device according to the first or second aspect, the engaging part is constructed by spirally winding one or more wires, and therefore not only is the effect of the indwelling device according to the first or second aspect obtained but an engaging part that exhibits such an effect can also be easily constructed. 
     Furthermore, according to the fourth aspect of the disclosed embodiments, in the indwelling device according to the third aspect, the end part of the wire on the side not connected to the device body is located on the distal end side in the advancing direction of the indwelling device while being placed in a body, and therefore not only is the effect of the indwelling device according to the third aspect obtained but the engaging part can also be swiftly abutted on the bodily wall, and consequently the indwelling device can be swiftly placed in the body. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic overall view of a medical appliance for placing an indwelling device—according to the first embodiment of the disclosed embodiments—in a body. 
         FIG. 2  is a longitudinal sectional view of  FIG. 1 . 
         FIG. 3  is a longitudinal sectional view of the medical appliance, illustrating a state that the indwelling device according to the first embodiment is pushed out from the medical appliance. 
         FIG. 4  is an enlarged sectional view of a part A in  FIG. 2 . 
         FIG. 5  is an enlarged sectional view of a part B in  FIG. 3 . 
         FIG. 6  is an enlarged sectional view corresponding to  FIG. 4  in a case that an indwelling device according to the second embodiment is disposed. 
         FIG. 7  is an enlarged sectional view corresponding to  FIG. 5  in a case that an indwelling device according to the second embodiment is disposed. 
         FIG. 8  is an overall view of an indwelling device according to the third embodiment. 
         FIG. 9  is an overall view of an indwelling device according to the fourth embodiment. 
         FIG. 10  is an overall view of an indwelling device according to the fifth embodiment. 
         FIG. 11  is an overall view of an indwelling device according to the sixth embodiment. 
         FIG. 12  is an overall view of an indwelling device according to the seventh embodiment. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present invention will be explained with reference to the drawings. 
     First Embodiment 
     First, a first embodiment will be explained. 
       FIG. 1  is a schematic overall view of a medical appliance for placing an indwelling device—according to the first embodiment—in a body.  FIG. 2  is a longitudinal sectional view of  FIG. 1 . 
       FIG. 3  is a longitudinal sectional view of the medical appliance, illustrating a state that the indwelling device according to the first embodiment is pushed out from the medical appliance.  FIG. 4  is an enlarged sectional view of a part A in  FIG. 2 .  FIG. 5  is an enlarged sectional view of a part B in  FIG. 3 . 
     As illustrated in  FIG. 1  to  FIG. 3 , a medical appliance  100  for placing an indwelling device  1  (see  FIG. 2  to  FIG. 5 ) according to the first embodiment described below in a patient&#39;s body is composed of a catheter body  102 , a connector  104  connected to a proximal end of the catheter body  102 , a pusher member  103  slidably inserted into a catheter lumen  105  of the catheter body  102  as well as a distal end-side lumen  101   a  and an intermediate lumen  101   b  of the connector  104 , and a grip part  106  abutting a proximal end of the pusher member  103 . 
     The catheter body  102  is a hollow cylindrical flexible long member and has the catheter lumen  105  inside thereof and an opening  102   a  on the distal end thereof. 
     A material for the catheter body  102  is a resin material made of a biocompatible material. Various synthetic resin materials, for example, a polyolefin resin (such as a polyethylene, a polypropylene, and an ethylene-propylene copolymer), a polyamide resin (such as a polyamide elastomer), a polyester, a polyurethane, a polyvinyl chloride resin, a fluororesin such as Teflon (registered trademark), an ethylene-vinyl acetate copolymer can be used. In the first embodiment, a polyamide elastomer is preferably used. 
     The pusher member  103  is composed of a solid cylindrical flexible long member  103   a  and an abutting part  103   b  connected to the proximal end of the long member  103   a . The pusher member  103  is slidably inserted into the catheter lumen  105  of the catheter body  102 , a distal end of the pusher member  103  is located in the vicinity of a distal end of the catheter body  102 , and the proximal end of the pusher member  103  is located inside of the connector  104 . 
     Incidentally, a material for the flexible long member  103   a  of the pusher member  103  is a metal material made of a biocompatible material, and for example, various metal materials such as a stainless steel, an NiTi shape-memory alloy, and a cobalt-chromium alloy can be used, and in the first embodiment, a stainless steel is preferably used. 
     In addition, a material for the abutting part  103   b  of the pusher member  103  is not particularly limited, and an ordinary resin material such as polyacetal and polycarbonate can be used. 
     In the grip part  106 , a screw part  106   a  located on the distal end and a grip part body  106   b  connected to a proximal end of the screw part  106   a  and having an outer diameter larger than that of the screw part  106   a  are integrally formed. 
     A material for the grip part  106  is not particularly limited as long as the material has a higher rigidity than the material of the catheter body  102 . For example, a polyethylene, a polypropylene, a polycarbonate, a polyacetal, a polyvinyl chloride (PVC), a polybutadiene (PBD), an ABS resin, or the like can be used, and in the first embodiment, a polyvinyl chloride (PVC) is preferably used. 
     The connector  104  is a hollow member having a tapered distal end side and a hollow cylindrical proximal end side, and the distal end is connected to the proximal end of the catheter body  102 . The connector  104  has the distal end-side lumen  101 a that communicates with the catheter lumen  105  of the catheter body  102  through a circular opening  101   d  located on the distal end of the connector  104 , the intermediate lumen  101   b  located on a middle part of the connector  104 , and a proximal end-side lumen  101   c  located on the proximal end side of the connector  104 . 
     In addition, the connector  104  has an intermediate wall  104   a  between the distal end-side lumen  101   a  and the intermediate lumen  101   b , and a circular opening  101   e  is formed in the center of the intermediate wall  104   a . In addition, a spiral screw groove  104   b  is formed on an inner surface of the connector  104 , where the proximal end-side lumen  101   c  of the connector  104  is formed. 
     The screw part  106   a  of the grip part  106  is screwed into the screw groove  104   b  of the connector  104 . Thus, when the grip part body  106   b  is turned in a R 1  direction (clockwise direction toward the distal direction) with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104 . 
     A proximal end of the flexible long member  103   a  of the pusher member  103  is inserted through the opening  101   d  and the opening  101   e  of the connector  104  to the intermediate lumen  101   b  of the connector  104 , and the abutting part  103   b  located on the proximal end of the pusher member  103  is disposed inside of the intermediate lumen  101   b  of the connector  104 . 
     Herein, in the intermediate lumen  101   b  of the connector  104 , a compression spring  109  is disposed between the intermediate wall  104   a  and the abutting part  103   b  of the pusher member  103 , and the compression spring  109  always acts so as to energize the abutting part  103   b  toward the right side of the figure. 
     Thus, when the grip part body  106   b  is turned in the R 1  direction with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104  against an energizing force of the compression spring  109  for energizing the abutting part  103   b  toward the right side of the figure, and at the same time, the pusher member  103  also moves to the left side of the figure. 
     On the other hand, when the grip part body  106   b  is turned in an inverse R 1  direction with respect to the connector  104 , the abutting part  103   b  is energized toward the right side of the figure by the compression spring  109 , so that the grip part  106  moves to the right side of the figure with respect to the connector  104 , and at the same time, the pusher member  103  also moves to the right side of the figure. 
     Also, a material for the connector  104  is not particularly limited as long as the material has a higher rigidity than the material of the catheter body  102 . For example, a polyethylene, a polypropylene, a polycarbonate, a polyacetal, a polyvinyl chloride (PVC), a polybutadiene (PBD), an ABS resin, or the like can be used, and in the first embodiment, a polyvinyl chloride (PVC) is preferably used. 
     Herein, the indwelling device  1  according to the first embodiment will be explained. The indwelling device  1  is explained in such a way that the advancing direction of the medical appliance  100  (i.e., a direction toward a patient&#39;s lesion) is a distal end side and an opposite side thereto is a proximal end side. 
     As illustrated in  FIG. 4 , the indwelling device  1  includes an IC tag  9  that stores various information in an inside thereof. The indwelling device  1  is composed of the device body  3 , and the engaging part  5  connected to the proximal end side of the device body  3 . 
     The device body  3  according to the first embodiment is a hollow cylindrical member having a diameter of several millimeters. As a material for the device body  3 , a resin material made of a biocompatible material, e.g. various synthetic resin materials including a polyolefin resin (such as a polyethylene, a polypropylene and an ethylene-propylene copolymer), a polyamide resin (such as a polyamide elastomer), a polyester, a polyurethane, a polyvinyl chloride resin, a fluororesin such as Teflon (registered trademark), an ethylene-vinyl acetate copolymer, and the like; as well as a metal material made of a biocompatible material can be used. 
     The engaging part  5  according to the first embodiment is composed of a coil constructed by winding one NiTi shape-memory alloy wire in a hollow shape, and the engaging part  5  is wound around a proximal outer periphery of the device body  3  in a state that the coil is contracted (with respect to a radially unconstrained state of the coil in which the coil is not radially compressed). Incidentally, in the engaging part  5  according to the first embodiment, a distal end part  5 a of the coil is fixed to the device body, and a proximal end part  5   b  of the coil is a free end (i.e., is not fixed). 
     Incidentally, since the engaging part  5  according to the first embodiment is simply constructed by winding one NiTi shape-memory alloy wire in a hollow shape, the engaging part that exerts an effect described below in the first embodiment can be easily constructed. 
     The indwelling device  1  explained above is inserted into the catheter lumen  105  on the distal end of the catheter body  102 , and the distal end of the pusher member  103  is abutted on the proximal end of the indwelling device  1 . Then, the catheter body  102  in that state is inserted into the patient&#39;s body and advanced to the vicinity of the patient&#39;s lesion.  FIG. 2  and  FIG. 4  illustrate that state. 
     In addition to  FIG. 2  and  FIG. 3 ,  FIG. 4  and  FIG. 5  illustrate the bodily wall  99  in the patient&#39;s lesion for the purpose of explaining an engaging state of the indwelling device. 
     Then, when the grip part body  106 b is turned in the R 1  direction with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104 , and at the same time, the pusher member  103  also moves to the left side of the figure, the indwelling device  1  is pushed out from the catheter body  102  as illustrated in  FIG. 3  and  FIG. 5 , and the engaging part  5  composed of the coil is expanded, so that the engaging part  5  abuts on and engages with the bodily wall  99  in a state that a region of the engaging part  5 —excluding the end parts  5   a  and  5   b  of the engaging part—is expanded radially outward from an outer peripheral surface of the device body  3 . That is, at least this central region is expanded radially outward. Herein, the “end parts” of the engaging part refers to the ends of the wire(s) used to form the engaging part. 
     The indwelling device  1  according to the first embodiment includes the device body  3  and the engaging part  5  that is connected to the device body  3  and capable of abutting on the bodily wall  99 . Since the engaging part  5  can abut on the bodily wall  99  in a state that the region of the engaging part  15  excluding the end parts  5   a  and  5   b  is expanded radially outward from an outer peripheral surface of the device body  3 , the indwelling device  1  can be securely placed in the body without occluding the inside of the body and damaging the patient&#39;s bodily wall. 
     Second Embodiment 
     Next, a second embodiment will be explained.  FIG. 6  is an enlarged sectional view corresponding to  FIG. 4  in a case that an indwelling device according to the second embodiment is disposed.  FIG. 7  is an enlarged sectional view corresponding to  FIG. 5  in a case that the indwelling device according to the second embodiment is disposed. 
     In the second embodiment, the same members as in the first embodiment are given the same reference numerals as in the first embodiment, and the explanation of the same members is omitted. In addition, a medical appliance for inserting an indwelling device  10  according to the second embodiment into a patient&#39;s body is the same as the medical appliance  100 . 
     Also in the second embodiment, the indwelling device  10  is explained in such a way that the advancing direction of the medical appliance  100  (i.e., a direction toward a patient&#39;s lesion) is a distal end side and an opposite side thereto is a proximal end side. 
     As illustrated in  FIG. 6 , the indwelling device  10  includes the IC tag  9  that stores various information in the inside thereof. The indwelling device  10  is composed of a device body  13 , and an engaging part  15  connected to the proximal end side of the device body  13 . 
     Like the device body  3  according to the first embodiment, the device body  13  according to the second embodiment is also a hollow cylindrical member having a diameter of several millimeters. As a material for the device body  13 , a resin material made of a biocompatible material, e.g. various synthetic resin materials including a polyolefin resin (such as a polyethylene, a polypropylene and an ethylene-propylene copolymer), a polyamide resin (such as a polyamide elastomer), a polyester, a polyurethane, a polyvinyl chloride resin, a fluororesin such as Teflon (registered trademark), an ethylene-vinyl acetate copolymer, and the like; as well as a metal material made of a biocompatible material can be used. 
     The engaging part  15  according to the second embodiment is composed of a braid obtained by braiding a plurality of wires  15 a wound in one direction and a plurality of wires  15 b wound in a direction intersecting with the winding direction of the plurality of wires  15 a. The engaging part  15  is wound around a proximal outer periphery of the device body  13  in a state that the braid is contracted (with respect to an radially unconstrained state of the braid in which the braid is not radially compressed). The plurality of the wires  15   a  and the plurality of the wires  15   b  are made of e.g. an NiTi shape-memory alloy. 
     Incidentally, the device body  13  according to the second embodiment is composed of a distal end part  13   a , a small-diameter part  13   b  having an outer diameter smaller than that of the distal end part  13   a , a tapered part  13   c  located on the proximal end side of the small-diameter part  13   b  and having a diameter gradually increasing toward the proximal direction, and a proximal end part  13 d located on the proximal end side of the tapered part  13   c  and having an outer diameter larger than that of the small-diameter part  13   b . In addition, the engaging part  15  composed of the braid is stored on the small-diameter part  13   b.    
     The indwelling device  10  explained above is inserted into the catheter lumen  105  on the distal end of the catheter body  102 , and the distal end of the pusher member  103  is abutted on the proximal end of the indwelling device  10 . Then, the catheter body  102  in that state is inserted into the patient&#39;s body and advanced to the vicinity of the patient&#39;s lesion.  FIG. 6  illustrates that state. 
     Then, when the grip part body  106   b  is turned in the R 1  direction with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104 , and at the same time, the pusher member  103  also moves to the left side of the figure, the indwelling device  10  is pushed out from the catheter body  102  as illustrated in  FIG. 7 , and the engaging part  15  composed of the braid is expanded, so that the engaging part  15  abuts on and engages with the bodily wall  99  in a state that a region of the engaging part  15  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  13 . 
     The indwelling device  10  according to the second embodiment includes the device body  13  and the engaging part  15  connected to the device body  13  and capable of abutting on the bodily wall  99 . Since the engaging part  15  can abut on the bodily wall  99  in a state that the region of the engaging part  15  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  13 , the indwelling device  10  can be securely placed in the body without occluding the inside of the body and damaging the patient&#39;s bodily wall  99 . 
     Additionally, according to the indwelling device  10  of the second embodiment, the device body  13  includes a small-diameter part  13   b  having an outer diameter smaller than of other regions, and the engaging part  15  is stored on the small-diameter part  13   b , so that the indwelling device  10  becomes easier to accommodate in the catheter lumen  105  of the catheter body  102 , and deliverability of the indwelling device  10  can be improved. 
     Third Embodiment 
     Next, a third embodiment will be explained.  FIG. 8  is an overall view of an indwelling device according to the third embodiment. 
     Incidentally, a medical appliance for inserting an indwelling device  20  according to the third embodiment into a patient&#39;s body is the same as the medical appliance  100 . Also in the third embodiment, the indwelling device  20  is explained in such a way that an advancing direction of the medical appliance  100  (i.e., a direction toward a patient&#39;s lesion) is a distal end side and an opposite side thereto is a proximal end side. 
     As illustrated in  FIG. 8 , the indwelling device  20  includes the IC tag  9  that stores various information in the inside thereof. The indwelling device  20  is composed of a device body  23 , and an engaging part  25  connected to the proximal end side of the device body  23 . 
     The device body  23  according to the third embodiment is composed of a distal end part  23   a , a small-diameter part  23   b  having an outer diameter smaller than that of the distal end part  23   a , a tapered part  23   c  located on the proximal end side of the small-diameter part  23   b  and having a diameter gradually increasing toward the proximal direction, and a proximal end part  23   d  located on the proximal end side of the tapered part  23   c  and having an outer diameter larger than that of the small-diameter part  23   b.    
     Incidentally, like the device body  3  according to the first embodiment, the device body  23  is also a hollow cylindrical member having a diameter of several millimeters. As a material for the device body  23 , a resin material made of a biocompatible material, e.g. various synthetic resin materials including a polyolefin resin (such as a polyethylene, a polypropylene and an ethylene-propylene copolymer), a polyamide resin (such as a polyamide elastomer), a polyester, a polyurethane, a polyvinyl chloride resin, a fluororesin such as Teflon (registered trademark), an ethylene-vinyl acetate copolymer, and the like; as well as a metal material made of a biocompatible material can be used. 
     The engaging part  25  according to the third embodiment is composed of a coil constructed by winding one NiTi shape-memory alloy wire in a hollow shape, and the engaging part  25  is wound around a proximal outer periphery of the device body  23  in a state that the coil is contracted. Incidentally, in the engaging part  25  according to the third embodiment, a distal end part  25   a  of the coil is fixed to the device body, a proximal end part  25   b  of the coil is a free end, and the engaging part  25  is stored on the small-diameter part  23   b  of the device body  23 . 
     Incidentally, since the engaging part  25  according to the third embodiment is simply constructed by winding one NiTi shape-memory alloy wire in a hollow shape, the engaging part that exerts an effect described below in the third embodiment can be easily constructed. 
     The indwelling device  20  explained above is inserted into the catheter lumen  105  on the distal end of the catheter body  102 , and the distal end of the pusher member  103  is abutted on the proximal end of the indwelling device  20 . Then, the catheter body  102  in that state is inserted into the patient&#39;s body and advanced to the vicinity of the patient&#39;s lesion. 
     Incidentally, as the indwelling device  20  according to the third embodiment, the whole indwelling device is not inserted into the catheter lumen  105  unlike the indwelling device  1  according to the first embodiment and the indwelling device  10  according to the second embodiment, and only the small-diameter part  23   b , the tapered part  23   c  and the proximal end part  23   d , as well as the engaging part  25  stored on the small-diameter part  23   b  are inserted into the catheter lumen  105 . 
     Thus, a pushed length of the indwelling device  20  pushed out from the catheter body  102  is shortened, the engaging part  25  can be swiftly abutted on the bodily wall  99 , and consequently the indwelling device  20  can be swiftly placed in the patient&#39;s body. 
     Then, when the grip part body  106   b  is turned in the R 1  direction with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104 , and at the same time, the pusher member  103  also moves to the left side of the figure, the indwelling device  20  is pushed out from the catheter body  102 , and the engaging part  25  composed of the coil is expanded, so that the engaging part  25  abuts on and engages with the bodily wall  99  in a state that a region of the engaging part  25  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  23 . 
     The indwelling device  20  according to the third embodiment includes the device body  23  and the engaging part  25  connected to the device body  23  and capable of abutting on the bodily wall  99 . Since the engaging part  25  can abut on the bodily wall  99  in a state that the region of the engaging part  25  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  23 , the indwelling device  20  can be securely placed in the body without occluding the inside of the body and damaging the patient&#39;s bodily wall  99 . 
     Additionally, according to the indwelling device  20  of the third embodiment, the device body  23  includes the small-diameter part  23   b  having the outer diameter smaller than of other regions, and the engaging part  25  is stored on the small-diameter part  23   b , so that the indwelling device  20  becomes easier to accommodate in the catheter lumen  105  of the catheter body  102 , and deliverability of the indwelling device  20  can be improved. 
     Fourth Embodiment 
     Next, a fourth embodiment of the will be explained.  FIG. 9  is an overall view of an indwelling device according to the fourth embodiment. 
     Incidentally, a medical appliance for inserting an indwelling device  30  according to the fourth embodiment into a patient&#39;s body is the same as the medical appliance  100 . Also in the fourth embodiment, the indwelling device  30  is explained in such a way that the advancing direction of the medical appliance  100  (i.e., a direction toward a patient&#39;s lesion) is a distal end side and an opposite side thereto is a proximal end side. 
     As illustrated in  FIG. 9 , the indwelling device  30  includes the IC tag  9  that stores various information in the inside thereof. The indwelling device  30  is composed of a device body  33 , and an engaging part  35  connected to the proximal end side of the device body  33 . 
     The device body  33  according to the fourth embodiment is composed of a distal end part  33   a , a small-diameter part  33   b  having an outer diameter smaller than that of the distal end part  33   a , a tapered part  33   c  located on the proximal end side of the small-diameter part  33   b  and having a diameter gradually increasing toward the proximal direction, and a proximal end part  33   d  located on the proximal end side of the tapered part  33   c  and having an outer diameter larger than that of the small-diameter part  33   b.    
     Incidentally, like the device body  3  according to the first embodiment, the device body  33  is also a hollow cylindrical member having a diameter of several millimeters. As a material for the device body  33 , a resin material made of a biocompatible material, e.g. various synthetic resin materials including a polyolefin resin (such as a polyethylene, a polypropylene and an ethylene-propylene copolymer), a polyamide resin (such as a polyamide elastomer), a polyester, a polyurethane, a polyvinyl chloride resin, a fluororesin such as Teflon (registered trademark), an ethylene-vinyl acetate copolymer, and the like; as well as a metal material made of a biocompatible material can be used. 
     The engaging part  35  according to the fourth embodiment is composed of a coil constructed by winding one NiTi shape-memory alloy wire in a hollow shape, and the engaging part  35  is wound around a proximal outer periphery of the device body  33  in a state that the coil is contracted. Incidentally, unlike the engaging part  25  according to the third embodiment, in the engaging part  35  according to the fourth embodiment, a proximal end part  35   a  of the coil is fixed to the device body  33 , a distal end part  35   b  of the coil is a free end, and the engaging part  35  is stored on the small-diameter part  33   b  of the device body  33 . 
     That means, in the engaging part  35  according to the fourth embodiment, since the end part  35   b  on the side not connected to the device body  33  is located on the distal end side in an advancing direction of the indwelling device  30  while being placed in the body, the engaging part  35  can be swiftly abutted on the bodily wall  99 , and consequently the indwelling device  30  can be swiftly placed in the patient&#39;s body. 
     In addition, since the engaging part  35  according to the fourth embodiment is simply constructed by winding one NiTi shape-memory alloy wire in a hollow shape, the engaging part that exerts an effect described below in the fourth embodiment can be easily constructed. 
     The indwelling device  30  explained above is inserted into the catheter lumen  105  on the distal end of the catheter body  102 , and the distal end of the pusher member  103  is abutted on the proximal end of the indwelling device  30 . Then, the catheter body  102  in that state is inserted into the patient&#39;s body and advanced to the vicinity of the patient&#39;s lesion. 
     Then, when the grip part body  106 b is turned in the R 1  direction with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104 , and at the same time, the pusher member  103  also moves to the left side of the figure, the indwelling device  30  is pushed out from the catheter body  102 , and the engaging part  35  composed of the coil is expanded, so that the engaging part  35  abuts on and engages with the bodily wall  99  in a state that a region of the engaging part  35  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  33 . 
     The indwelling device  30  according to the fourth embodiment includes the device body  33  and the engaging part  35  connected to the device body  33  and capable of abutting on the bodily wall  99 . Since the engaging part  35  can abut on the bodily wall  99  in a state that the region of the engaging part  35  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  33 , the indwelling device  30  can be securely placed in the body without occluding the inside of the body and damaging the patient&#39;s bodily wall  99 . 
     Additionally, according to the indwelling device  30  of the fourth embodiment, the device body  33  includes the small-diameter part  33 b having the outer diameter smaller than of other regions, and the engaging part  35  is stored on the small-diameter part  33 b, so that the indwelling device  30  becomes easier to accommodate in the catheter lumen  105  of the catheter body  102 , and deliverability of the indwelling device  30  can be improved. 
     Furthermore, according to the indwelling device  30  of the fourth embodiment, in the coil of the engaging part  35 , the end part  35 b on the side not connected to the device body  33  is located closer to a distal end side in an advancing direction of the indwelling device  30  while being placed in the body than the end part  35 a on the side connected to the device body  33 , so that the engaging part  35  can be swiftly abutted on the bodily wall  99 , and consequently the indwelling device  30  can be swiftly placed in the body. 
     Fifth Embodiment 
     Next, a fifth embodiment of the disclosed embodiments will be explained.  FIG. 10  is an overall view of an indwelling device according to the fourth embodiment. 
     Incidentally, a medical appliance for inserting an indwelling device  40  according to the fifth embodiment into a patient&#39;s body is the same as the medical appliance  100 . Also in the fifth embodiment, the indwelling device  40  is explained in such a way that the advancing direction of the medical appliance  100  (i.e., a direction toward a patient&#39;s lesion) is a distal end side and an opposite side thereto is a proximal end side. 
     As illustrated in  FIG. 10 , the indwelling device  40  includes the IC tag  9  that stores various information in the inside thereof. The indwelling device  40  is composed of a device body  43 , and an engaging part  45  connected to the proximal end side of the device body  43 . 
     The device body  43  according to the fifth embodiment is composed of a distal end part  43   a , a small-diameter part  43   b  having an outer diameter smaller than that of the distal end part  43   a , a tapered part  43   c  located on the proximal end side of the small-diameter part  43   b  and having a diameter gradually increasing toward the proximal direction, and a proximal end part  43   d  located on the proximal end side of the tapered part  43   c  and having an outer diameter larger than that of the small-diameter part  43   b.    
     Incidentally, like the device body  3  according to the first embodiment, the device body  43  is also a hollow cylindrical member having a diameter of several millimeters. As a material for the device body  43 , a resin material made of a biocompatible material, e.g. various synthetic resin materials including a polyolefin resin (such as a polyethylene, a polypropylene and an ethylene-propylene copolymer), a polyamide resin (such as a polyamide elastomer, a polyester, a polyurethane, a polyvinyl chloride resin, a fluororesin such as Teflon (registered trademark), an ethylene-vinyl acetate copolymer, and the like; as well as a metal material made of a biocompatible material can be used. 
     Unlike the engaging part  35  according to the fourth embodiment, the engaging part  45  according to the fifth embodiment is composed of a coil constructed by winding two NiTi shape-memory alloy wires in a hollow shape, and the engaging part  45  is wound around a proximal outer periphery of the device body  43  in a state that the coil is contracted. Incidentally, like the engaging part  35  according to the fourth embodiment, also in the engaging part  45  according to the fifth embodiment, a proximal end part  45 a and a proximal end part  45 c of the coil are fixed to the device body  43 , a distal end part  45 b and a distal end part  45 d of the coil are free ends, and the engaging part  45  is stored on the small-diameter part  43 b of the device body  43 . 
     Incidentally, since the engaging part  45  according to the fifth embodiment is simply constructed by winding two NiTi shape-memory alloy wires in a hollow shape, the engaging part that exerts an effect described below in the fifth embodiment can be easily constructed. 
     The indwelling device  40  explained above is inserted into the catheter lumen  105  on the distal end of the catheter body  102 , and the distal end of the pusher member  103  is abutted on the proximal end of the indwelling device  40 . Then, the catheter body  102  in that state is inserted into the patient&#39;s body and advanced to the vicinity of the patient&#39;s lesion. 
     Then, when the grip part body  106   b  is turned in the R 1  direction with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104 , and at the same time, the pusher member  103  also moves to the left side of the figure, the indwelling device  40  is pushed out from the catheter body  102 , and the engaging part  45  composed of the coil is expanded, so that the engaging part  45  abuts on and engages with the bodily wall  99  in a state that a region of the engaging part  45  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  43 . 
     The indwelling device  40  according to the fifth embodiment includes the device body  43  and the engaging part  45  connected to the device body  43  and capable of abutting on the bodily wall  99 . Since the engaging part  45  can abut on the bodily wall  99  in a state that the region of the engaging part  45  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  43 , the indwelling device  40  can be securely placed in the body without occluding the inside of the body and damaging the patient&#39;s bodily wall  99 . 
     Additionally, according to the indwelling device  40  of the fifth embodiment, the device body  43  includes the small-diameter part  43   b  having the outer diameter smaller than of other regions, and the engaging part  45  is stored on the small-diameter part  43   b , so that the indwelling device  30  becomes easier to accommodate in the catheter lumen  105  of the catheter body  102 , and deliverability of the indwelling device  40  can be improved. 
     Additionally, according to the indwelling device  40  of the fifth embodiment, in the coil of the engaging part  45 , the end parts  45   b  and  45   d  on the side not connected to the device body  43  are located closer to a distal end side in an advancing direction of the indwelling device  40  while being placed in the body than the end parts  45 a and  45 c on the side connected to the device body  43 , so that the engaging part  45  can be swiftly abutted on the bodily wall  99 , and consequently the indwelling device  40  can be swiftly placed in the body. 
     Furthermore, according to the indwelling device  40  of the fifth embodiment, since the coil as the engaging part  45  is composed of two wires, the indwelling device  40  can be more firmly placed in the bodily wall  99 . 
     Incidentally, in the fifth embodiment, although the engaging part  45  is formed as the coil composed of two NiTi shape-memory alloy wires, the coil may be composed of two or more NiTi shape-memory alloy wires, and the coil as the engaging part  45  may be composed of a wire made of a biocompatible shape-memory alloy other than the NiTi shape-memory alloy. 
     Sixth Embodiment 
     Next, a sixth embodiment will be explained.  FIG. 11  is an overall view of an indwelling device according to the sixth embodiment. 
     Incidentally, a medical appliance for inserting an indwelling device  50  according to the sixth embodiment into a patient&#39;s body is the same as the medical appliance  100 . Also in the sixth embodiment, the indwelling device  50  is explained in such a way that the advancing direction of the medical appliance  100  (i.e., a direction toward a patient&#39;s lesion) is a distal end side and an opposite side thereto is a proximal end side. 
     As illustrated in  FIG. 11 , the indwelling device  50  includes the IC tag  9  that stores various information in the inside thereof, and the indwelling device  50  is composed of a device body  53  and an engaging part  55  connected to the distal end side of the device body  53 . That means, unlike the device bodies according to the first to fifth embodiments, the device body  53  according to the sixth embodiment has a configuration in which the engaging part  55  is disposed on the distal end side of the device body  53 . 
     In addition, the device body  53  is composed of a small-diameter part  53   b  on the distal end side and a proximal end part  53   a  having an outer diameter larger than of the small-diameter part  53   b.    
     Incidentally, like the device body  3  according to the first embodiment, the device body  53  is also a hollow cylindrical member having a diameter of several millimeters. As a material for the device body  53 , a resin material made of a biocompatible material, e.g. various synthetic resin materials including a polyolefin resin (such as a polyethylene, a polypropylene and an ethylene-propylene copolymer), a polyamide resin (such as a polyamide elastomer), a polyester, a polyurethane, a polyvinyl chloride resin, a fluororesin such as Teflon (registered trademark), an ethylene-vinyl acetate copolymer, and the like; as well as a metal material made of a biocompatible material can be used. 
     Like the engaging part  15  according to the second embodiment, the engaging part  55  according to the sixth embodiment is composed of a braid obtained by braiding a plurality of wires  55   a  wound in one direction and a plurality of wires  55   b  wound in a direction intersecting with the winding direction of the plurality of wires  55   a . The engaging part  55  is stored on the small-diameter part  53   b  of the device body  53  in a state that the braid is contracted. The plurality of the wires  55   a  and the plurality of the wires  55   b  are made of e.g. an NiTi shape-memory alloy. 
     The indwelling device  50  explained above is inserted into the catheter lumen  105  on the distal end of the catheter body  102 , and the distal end of the pusher member  103  is abutted on the proximal end of the indwelling device  50 . Then, the catheter body  102  in that state is inserted into the patient&#39;s body and advanced to the vicinity of the patient&#39;s lesion. 
     Then, when the grip part body  106 b is turned in the R 1  direction with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104 , and at the same time, the pusher member  103  also moves to the left side of the figure, the indwelling device  50  is pushed out from the catheter body  102 , and the engaging part  55  composed of the coil is expanded, so that the engaging part  55  abuts on and engages with the bodily wall  99  in a state that a region of the engaging part  55  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  53 . 
     The indwelling device  50  according to the sixth embodiment includes the device body  53  and the engaging part  55  connected to the device body  53  and capable of abutting on the bodily wall  99 . Since the engaging part  55  can abut on the bodily wall  99  in a state that the region of the engaging part  55  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  53 , the indwelling device  50  can be securely placed in the body without occluding the inside of the body and damaging the patient&#39;s bodily wall  99 . 
     Additionally, according to the indwelling device  50  of the sixth embodiment, the device body  53  includes the small-diameter part  53   b  having the outer diameter smaller than of other regions, and the engaging part  55  is wound around the small-diameter part  53   b , so that the indwelling device  50  becomes easier to accommodate in the catheter lumen  105  of the catheter body  102 , and deliverability of the indwelling device  50  can be improved. 
     Furthermore, according to the indwelling device  50  of the sixth embodiment, since the engaging part  55  is disposed on the distal end side of the device body  53 , the engaging part  55  can be swiftly abutted on the bodily wall  99  before the whole indwelling device  50  is pushed out from the catheter body  102 , and consequently the indwelling device  50  can be swiftly placed in the body. 
     Seventh Embodiment 
     Finally, a seventh embodiment will be explained.  FIG. 12  is an overall view of an indwelling device according to the seventh embodiment. 
     Incidentally, a medical appliance for inserting an indwelling device  60  according to the seventh embodiment into a patient&#39;s body is the same as the medical appliance  100 . Also in the seventh embodiment, the indwelling device  60  is explained in such a way that the advancing direction of the medical appliance  100  (i.e., a direction toward a patient&#39;s lesion) is a distal end side and an opposite side thereto is a proximal end side. 
     As illustrated in  FIG. 12 , the indwelling device  60  includes the IC tag  9  that stores various information in the inside thereof. Like the indwelling device  50  according to the sixth embodiment, the indwelling device  60  is composed of a device body  63 , and an engaging part  65  connected to the distal end side of the device body  63 . 
     In addition, the device body  63  is composed of a small-diameter part  63   b  on the distal end side and a proximal end part  63   a  having an outer diameter larger than of the small-diameter part  63   b.    
     Incidentally, like the device body  3  according to the first embodiment, the device body  63  is also a hollow cylindrical member having a diameter of several millimeters. As a material for the device body  63 , a resin material made of a biocompatible material, e.g. various synthetic resin materials including a polyolefin resin (such as a polyethylene, a polypropylene and an ethylene-propylene copolymer), a polyamide resin (such as a polyamide elastomer), a polyester, a polyurethane, a polyvinyl chloride resin, a fluororesin such as Teflon (registered trademark), an ethylene-vinyl acetate copolymer, and the like; as well as a metal material made of a biocompatible material can be used. 
     The engaging part  65  according to the seventh embodiment is composed of a coil constructed by winding one NiTi shape-memory alloy wire in a hollow shape, and the engaging part  65  is wound around an outer periphery of the small-diameter part  63 b of the device body  63  in a state that the coil is contracted. Incidentally, in the engaging part  65  according to the seventh embodiment, a proximal end part  65   a  of the coil is fixed to the device body, and a distal end part  65   b  of the coil is a free end. 
     That means, in the engaging part  65  according to the seventh embodiment, since the end part  65   b  on the side not connected to the device body  63  is located on the distal end side in an advancing direction of the indwelling device  60  while being placed in the body, the engaging part  65  can be swiftly abutted on the bodily wall  99 , and consequently the indwelling device  30  can be swiftly placed in the patient&#39;s body. 
     In addition, since the engaging part  65  according to the seventh embodiment is simply constructed by winding one NiTi shape-memory alloy wire in a hollow shape, the engaging part that exerts an effect described below in the seventh embodiment can be easily constructed. 
     The indwelling device  60  explained above is inserted into the catheter lumen  105  on the distal end of the catheter body  102 , and the distal end of the pusher member  103  is abutted on the proximal end of the indwelling device  60 . Then, the catheter body  102  in that state is inserted into the patient&#39;s body and advanced to the vicinity of the patient&#39;s lesion. 
     Then, when the grip part body  106 b is turned in the R 1  direction with respect to the connector  104 , the grip part  106  moves to the left side of the figure with respect to the connector  104 , and at the same time, the pusher member  103  also moves to the left side of the figure, the indwelling device  60  is pushed out from the catheter body  102 , and the engaging part  65  composed of the coil is expanded, so that the engaging part  65  abuts on and engages with the bodily wall  99  in a state that a region of the engaging part  36  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  63 . 
     The indwelling device  60  according to the seventh embodiment includes the device body  63  and the engaging part  65  connected to the device body  63  and capable of abutting on the bodily wall  99 . Since the engaging part  65  can abut on the bodily wall  99  in a state that the region of the engaging part  65  excluding the end parts is expanded radially outward from an outer peripheral surface of the device body  63 , the indwelling device  60  can be securely placed in the body without occluding the inside of the body and damaging the patient&#39;s bodily wall  99 . 
     Additionally, according to the indwelling device  60  of the seventh embodiment, the device body  63  includes the small-diameter part  63   b  having the outer diameter smaller than of other regions, and the engaging part  65  is wound around the small-diameter part  63   b , so that the indwelling device  60  becomes easier to accommodate in the catheter lumen  105  of the catheter body  102 , and deliverability of the indwelling device  60  can be improved. 
     Furthermore, according to the indwelling device  60  of the seventh embodiment, the engaging part  65  is disposed on the distal end side of the device body  63 , and in the coil of the engaging part  65 , the end part  65   b  on the side not connected to the device body  63  is located closer to a distal end side in an advancing direction of the indwelling device  60  while being placed in the body than the end part  65   a  on the side connected to the device body  63 , so that the engaging part  65  can be more swiftly abutted on the bodily wall  99 , and consequently the indwelling device  60  can be more swiftly placed in the body. 
     Indwelling devices according to various embodiments of the present invention have been explained above, however, the present invention is not limited to the above embodiments, and can be variously modified and executed without departing from the gist of the invention. 
     For example, the engaging part  5  according to the first embodiment and the engaging part  45  according to the fifth embodiment may be connected to the small-diameter part  63 b of the device body  63  according to the seventh embodiment. Thereby, the engaging part  5  and the engaging part  45  can be swiftly abutted on the bodily wall  99 , and consequently the indwelling device can be swiftly placed in the body. 
     On the other hand, the engaging part  15  according to the second embodiment, the engaging part  35  according to the fourth embodiment, and the engaging part  45  according to the fifth embodiment can also be connected to the proximal end side of the device body  3  according to the first embodiment. 
     DESCRIPTION OF REFERENCE NUMERALS 
       1 ,  10 ,  20 ,  30 ,  40 ,  50 ,  60  Indwelling device 
       3 ,  13 ,  23 ,  33 ,  43 ,  53 ,  63  Device body 
       5 ,  15 ,  25 ,  35 ,  45 ,  55 ,  65  Engaging part 
       9  IC tag 
       13   b ,  23   b ,  33   b ,  43   b ,  53   b ,  63   b  Small-diameter part 
       99  Bodily wall 
       100  Medical appliance 
       102  Catheter body 
       103  Pusher member 
       104  Connector 
       105  Catheter lumen 
       106  Grip part