JP6018965B2 - Foreign body capture device in body cavity - Google Patents

Description

  The present invention relates to a foreign body capturing tool in a body cavity for capturing a foreign body generated in a body cavity of a human body such as a tubular organ.

  Foreign bodies such as gallstones, pancreatic stones, and blood clots may be generated in tubular organs such as bile ducts, pancreatic ducts, ureters, blood vessels, and other body cavities. For this reason, such foreign substances are captured and removed from the body cavity.

  For example, in Patent Document 1 below, a tube, a wire inserted into the tube, and a metal wire are braided to form a cylindrical shape, and its proximal end is bundled and connected to the distal end of the tube. A tubular organ comprising a basket that is bound to the distal end portion of the wire by bundling the distal end portion, and a handle portion that holds the proximal end portion of the tube and that holds the proximal end portion of the wire relative to the tube. The treatment tool is described.

  The basket has a mesh shape with a plurality of metal wires on the tip side, and a plurality of metal wires are bundled on the base end side to form a plurality of converging portions. Joined to the tip of the tube, an opening is formed between the converging parts.

  In actual use of the treatment device, the basket is stored in the distal end of the catheter with a reduced diameter, and the treatment device is inserted into a body cavity such as a bile duct via the catheter, and is inserted from the distal end of the catheter at a predetermined position. By projecting the basket and transferring the basket to a position beyond the foreign body in the body cavity, operating the handle at that position and pulling the wire toward the proximal side expands the diameter of the basket. The foreign matter is received from the opening of the first and the foreign matter is captured by the mesh portion on the tip side.

  After that, by pulling the treatment tool toward the hand side, the basket is moved to the large diameter part of the tubular organ such as the duodenum, and the handle part is operated at that part, and the diameter expansion / contraction operation of the basket is repeated as appropriate. Foreign matter is discharged from the opening on the base end side of the basket.

International Publication WO2009 / 150920 Specification

  In the case of the above-mentioned patent document 1, a plurality of metal wires are braided on the tip end side of the basket to form a mesh shape. However, the metal wire forming the mesh is bundled by a plurality on the base end side of the basket to form a converging portion, and further, the base end portions of the plurality of converging portions are joined to the tube distal end portion. When the basket was expanded in diameter, there was a demerit that the opening width between the converging parts was narrow.

  Therefore, when the basket is enlarged in diameter and foreign matter is captured through the opening on the base end side, there is a problem that it is difficult to capture large foreign matter and it is difficult to discharge the foreign matter from the opening. Furthermore, since the basket is formed from a plurality of metal wires, the trapped foreign matter is clogged and cannot be discharged, or the basket is relatively rigid and difficult to deform. In some cases, the outer periphery of the basket is difficult to adhere, and foreign matter passes between the outer periphery of the basket and the inner periphery of the body cavity, and the foreign matter cannot be completely captured by the basket.

  Accordingly, an object of the present invention is to make it easier to closely attach a basket to the inner periphery of a body cavity such as a tubular organ, thereby enhancing the trapping ability of foreign matter, and also capable of catching large foreign matter. An object of the present invention is to provide a foreign body capturing device in a body cavity that can be discharged.

  In order to achieve the above object, a foreign body capturing tool in a body cavity of the present invention comprises a tube, an operation wire inserted into the tube, a proximal end portion connected to the distal end portion of the tube, and a distal end of the operation wire. When the operation wire is in a predetermined operation position, the outer periphery is fixed to the plurality of skeleton wires and the outer periphery is fixed to the plurality of skeleton wires, and the operation wire is inserted into the center portion. In a state where the plurality of skeletal wire rods are radially spread, the base end side is open and a resin cover having a basket shape capable of catching foreign matters, and the plurality of skeleton wire rods are radially spread, A concave curved portion adjacent to the outer surface on the distal end side of the cover is provided on the distal end side of the portion of the skeleton wire rod to which the cover is fixed, and the operation wire is further connected to the tube. Base Pulling on the side, a concave curvature of the backbone wire, characterized in that it is configured to press the outer surface of the distal end portion side of the cover.

  In the foreign body capturing tool in the body cavity according to the present invention, in a state where the plurality of skeletal wires spread radially, the distal end side protrudes toward the distal end side from the portion where the cover of each skeletal wire is fixed. It is preferable that a convex curved portion that returns to the proximal end portion side and a concave curved portion that returns to the proximal end portion side and protrudes toward the distal end portion side again are provided, and is curved in an S shape as a whole.

  In the foreign body capturing tool in a body cavity according to the present invention, the cover is preferably made of polyurethane and has a thickness of 2 to 200 μm.

  According to the present invention, when the operation wire is in a predetermined operation position, the plurality of skeletal wires spread radially and the resin cover spreads to form a basket shape, so that the peripheral edge of the relatively soft cover is the body cavity. It is possible to improve the trapping property of the foreign matter by closely adhering to the inner periphery of the material. Moreover, the opening when the cover is expanded can be enlarged so that foreign objects such as large gallstones can be easily captured.

  Further, when the operation wire is further pulled toward the proximal end side with respect to the tube in this state, the concave curved portion of the skeletal wire is configured to push the outer surface on the distal end side of the cover. The trapped foreign matter such as gallstones can be pushed out from the opening on the base end side of the cover, and the trapped foreign matter can be easily discharged.

It is a perspective view which shows one Embodiment of the foreign material trap in the body cavity which concerns on this invention. It is a principal part enlarged front view of the foreign material capturing tool. The operation | movement of the foreign material capture tool is shown, (a) is explanatory drawing of the state which accommodated the skeleton wire and cover in the sheath, (b) is explanatory drawing of the state which protruded the skeleton wire and cover from the sheath front-end | tip. . The operation | movement of the foreign material capture tool is shown, (a) is explanatory drawing of the state which expanded the skeleton wire and the cover, (b) is the state which expanded the skeleton wire and the cover further than (a). It is explanatory drawing. 3A is a partially enlarged explanatory view of FIG. 3A, and FIG. 3B is a partially enlarged explanatory view of FIG. 4A is a partially enlarged explanatory view of FIG. 4A, and FIG. 4B is a partially enlarged explanatory view of FIG. It is explanatory drawing which shows the 1st use condition of the foreign material capture tool. It is explanatory drawing which shows the 2nd use condition of the foreign material capture tool. It is explanatory drawing which shows the 3rd use condition of the foreign material capture tool. It is explanatory drawing which shows the 4th use condition of the foreign material capture tool. It is explanatory drawing which shows the 5th use condition of the foreign material capture tool. The other embodiment of the foreign body capture | acquisition tool in the body cavity which concerns on this invention is shown, (a) is principal part expansion explanatory drawing, (b) is a principal part enlarged front view.

  Hereinafter, with reference to FIGS. 1-11, one Embodiment of the foreign material trap in the body cavity which concerns on this invention is described.

  As shown in FIG. 1, a foreign body capturing tool 10 (hereinafter referred to as “foreign body capturing tool 10”) in a body cavity in this embodiment includes a tube 15, an operation wire 20 inserted into the tube 15, and a tube 15. When the operation wire 20 is in a predetermined operation position, the base end portion 31 is connected to the distal end portion of the operation wire 20, and the plurality of skeletal wire rods 30 that spread radially when the operation wire 20 is in a predetermined operation position, The outer periphery is fixed to the skeletal wire 30, the operation wire 20 is inserted in the center, and the plurality of skeleton wires 30 spread radially, the base end side is opened and the foreign matter G (see FIG. 8) can be captured. A basket-shaped resin cover 40, a cylindrical sheath 45 that accommodates the tube 15, and an operation tool 50 that is attached to the base end portion of the sheath 45 and pushes and pulls the operation wire 20. To have.

  In this embodiment, the tube 15 has a cylindrical shape. The operation wire 20 inserted into the tube 15 extends longer than the tube 15 and protrudes a predetermined length from the distal end of the tube 15 while being inserted into the tube 15 and also has a predetermined length from the proximal end. Protruding. Therefore, by pushing and pulling the proximal end portion of the operation wire 20, the protruding length of the distal end portion of the operation wire 20 from the distal end of the tube 15 can be changed.

  The tube 15 or the operation wire 20 includes, for example, stainless steel, Ta, Ti, Pt, Au, W, Ni—Ti alloy, Co—Cr alloy, Co—Cr—Ni alloy, Cu—Zn. It is formed from a shape memory alloy such as a -X (X = Al, Fe, etc.) alloy, a Ni-Ti-X (X = Fe, Cu, V, Co, etc.) alloy, or the like. As the tube 15, for example, a synthetic resin tube such as a polyolefin resin, a polyamide resin such as nylon, a polyurethane, a fluorine resin, a polyether ether ketone, or a polyimide resin can be used.

  As shown in FIGS. 1 and 2, a plurality of the skeleton wire rods 30 (three in this embodiment) are arranged on the outer periphery of the tube 15 and the operation wire 20 protruding from the tip thereof with an equal interval. Has been. The number of skeleton wires 30 is preferably 2 to 8, and more preferably 3 to 5.

  Each base end portion 31 of each of the plurality of skeleton wires 30 is disposed on the outer periphery of the distal end portion of the tube 15, and the cylindrical connecting member 18 disposed on the outer periphery thereof is caulked to thereby form an outer periphery of the distal end portion of the tube 15. Each is connected. On the other hand, each distal end portion 32 of the plurality of skeleton wires 30 is disposed on the outer periphery of the distal end portion of the operation wire 20, and the outer peripheral portion of the distal end portion of the operation wire 20 is caulked by the cylindrical connecting member 21 disposed on the outer periphery thereof. Respectively.

  The base end portion 31 and the distal end portion 32 of each skeleton wire rod 30 may be connected to the distal end portion of the tube 15 or the distal end portion of the operation wire 20 by an adhesive, brazing, soldering, string-like body, or the like. Well, not particularly limited.

  As shown in FIGS. 3 to 6, the plurality of skeleton wires 30 are radially expanded from a state where the skeleton wire rods 30 are stretched and reduced in diameter depending on the operation position of the operation wire 20 (see FIGS. 3 and 5). (See FIG. 6). In addition, a resin cover 40 is fixed to a portion corresponding to the outermost periphery of each skeleton wire 30 in a state where the plurality of skeleton wires 30 spread radially. The skeleton wire 30 and the cover 40 are fixed by, for example, bonding the skeleton wire 30 to the cover 40 when an adhesive, brazing, soldering, sewing with a string-like body, or when the cover 40 is injection-molded. Or the like.

  Further, in a state where the plurality of skeleton wires 30 spread radially, the distal end side of the portion 33 (hereinafter, “fixed portion 33”) of each skeleton wire 30 to which the cover 40 is fixed is connected to the distal end portion from the fixed portion 33. A convex curved portion 34 that returns to the proximal end 31 side after projecting to the 32 end side, and returns to the proximal end portion 31 side from the convex curved portion 34 and then projects again to the distal end portion 32 side, and the distal end of the cover 40 A concave curved portion 35 that is close to the outer surface on the part side is provided, and has a shape that is curved in an S shape as a whole.

  Each skeletal wire 30 includes, for example, a Ni—Ti alloy, a Co—Cr alloy, a Co—Cr—Ni alloy, a Cu—Zn—X (X = Al, Fe, etc.) alloy, Ni—Ti—X (X = Fe, Cu, V, Co, etc.) formed from a shape memory alloy such as an alloy, stainless steel, Ta, Ti, Pt, Au, W, etc. Among them, it is preferable to be formed from a shape memory alloy. .

  Each skeleton wire 30 is preferably preliminarily shaped into a S-shaped shape having a convex curved portion 34 and a concave curved portion 35 as well as radially spreading as described above. Moreover, it is more preferable to use a shape memory alloy as each skeleton wire 30 and to perform shape memory processing to the above shape.

  As shown in FIGS. 1 and 6 (a), the resin cover 40 is fixed at the outer periphery by the fixing portions 33 of the plurality of skeleton wires 30, and the plurality of skeleton wires 30 spread radially. The base end side opens to form a basket shape that can catch foreign matter G (see FIG. 8). In the case of this embodiment, it has a curved surface shape in which the distal end side is closed, and gradually expands while gradually curving toward the proximal end side, and has a substantially dome shape with the proximal end side opened.

  Further, an insertion hole (not shown) is formed at the center of the front end portion of the cover 40, and the operation wire 20 is inserted into the insertion hole and a pair of fixings disposed on the outer periphery of the operation wire 20. The members 41, 41 are arranged on the front side periphery and the back side periphery of an insertion hole (not shown) so as to sandwich the tip of the cover 40 and are fixed by caulking, adhesive, brazing, soldering, or the like. .

  In addition, when the plurality of skeletal wires 30 are radially expanded and expanded by the operation of the operation wire 20, the cover 40 expands and expands in a basket shape accordingly, and the proximal end side opening is greatly opened. (Refer to FIG. 4 and FIG. 6) When the plurality of skeletal wire rods 30 are stretched to reduce the diameter, the diameter is reduced accordingly and the proximal end side opening is closed (see FIG. 3 and FIG. 5). .

  Further, the cover 40 has a basket shape when the plurality of skeleton wires 30 spread radially, and the outer periphery thereof is partially fixed to the fixing portion 33 in the middle of the plurality of skeleton wires 30 in the axial direction. The central portion of the distal end portion is fixed to the operation wire 20 by fixing members 41 and 41. Therefore, only the plurality of skeleton wires 30 are disposed on the opening side of the cover 40, and a large opening through which foreign matter G and fluid can pass is formed.

  Examples of the material of the cover 40 include polyurethane such as polyether polyurethane, polyester polyurethane, polycarbonate polyurethane, and polycabrolactone polyurethane, olefin elastomer such as polyurethane elastomer, nylon, nylon elastomer, and polybutadiene, and styrene. Elastomers, silicones, polyimide resins, polyether ketones, polyether ether ketones and the like can be employed, and among them, polyurethane is preferably employed.

  Moreover, it is preferable that the thickness of the cover 40 is 2-200 micrometers, and it is more preferable that it is 5-100 micrometers. If the thickness of the cover 40 is less than 2 μm, the cover 40 is easily broken when the diameter of the cover 40 is expanded or reduced, and if it exceeds 200 μm, the flexibility is poor and it is difficult to closely contact the inner periphery of the body cavity (see FIG. 9). The trapping performance of the foreign matter G is lowered.

The cover 40 is, for example, casted with a polymer solution in a state where a plurality of skeleton wires 30 are set in advance in a mold, or set a plurality of skeleton wires 30 in a mold and dipped into the polymer solution. Etc. can be formed.
Further, the cover 40 in this embodiment has a substantially dome shape, but is not limited to this shape. For example, the cover 40 may have a conical shape, a pyramid shape, a bowl shape, etc. Any basket may be used as long as the proximal end is open and the foreign matter G can be captured. Further, the cover 40 may be provided with a plurality of minute holes for fluid circulation through which foreign matter does not pass.

  In the case of this embodiment, a sheath 45 is further arranged on the outer periphery of the tube 15. As shown in FIGS. 5 and 6, the sheath 45 has a first lumen 46 and a second lumen 47, and the tube 15 is inserted through the first lumen 46, while the sheath 45 has a proximal end outer periphery. The guide wire 1 (see FIG. 7) can be inserted into the second lumen 47 through the formed guide wire insertion portion 48 (see FIG. 1).

  As shown in FIGS. 1, 3, and 4, the operation tool 50 that pushes and pulls the operation wire 20 includes a cylindrical main body 51 to which the proximal end portion of the tube 15 is connected, and a distal end of the main body 51. A sheath operating portion 52 slidably mounted on the outer periphery of the unit and connected to the base end of the main body 51 and a sheath operating unit 52 connected to the base end of the sheath 45 and connected to the base end of the operation wire 20 The wire operation unit 53 is mainly configured.

  As shown in FIG. 3A, in a state where the sheath operation portion 52 is slid toward the distal end side with respect to the main body 51, the tube 15, the operation wire 20 protruding from the distal end, and the cover 40 are reduced in diameter. In such a state, it is accommodated in the sheath 45.

  As shown in FIG. 3B, when the sheath operating portion 52 is slid to the proximal end side with respect to the main body 51, the tube 15, the operation wire 20 protruding from the distal end, and the cover 40 are sheathed. It protrudes from the tip of 45.

  In addition, as shown in FIGS. 3A and 3B, in a state where the wire operation portion 53 is slid to the distal end side with respect to the main body 51, the operation wire 20 is pushed out with respect to the tube 15, and each skeleton The wire 30 is stretched and contracted, and the cover 40 is contracted and folded.

  Then, as shown in FIG. 4A, when the wire operation portion 53 is slid slightly toward the base side with respect to the main body 51, the operation wire 20 is pulled, and as shown in FIG. The skeletal wire 30 spreads radially, and the cover 40 spreads in a basket shape.

  Further, as shown in FIG. 4B, when the wire operation portion 53 is further slid toward the base side with respect to the main body 51, the operation wire 20 is further pulled, and as shown in FIG. The concave curved portion 35 of each skeleton wire rod 30 is configured to push the outer surface on the tip side of the cover 40 so that the cover 40 is flattened.

  As described above, the operation wire 20 is further slid to the base side with respect to the main body 51 from the state in which the cover 40 is flattened (see FIG. 6B). Is further pulled, and the outer curved surface side of the cover 40 is further pressed by the concave curved portion 35 of each skeleton wire rod 30 so that the cover 40 is turned over to the opposite side. It becomes the dome shape which the part side opened.

  Next, an example of a method for using the foreign material capturing tool 10 of the present invention having the above-described configuration will be described.

  As shown in FIG. 7, a foreign body capturing device 10 of this embodiment is a tubular organ such as a body cavity of a human body, for example, a bile duct, a pancreatic duct, a ureter, a trachea, a blood vessel in a brain, a blood vessel such as a thoracic aorta or an abdominal aorta. It is used for capturing foreign matter G such as gallstones generated in V2, moving it to a tubular organ V1 such as a duodenum having a relatively large inner diameter, and discharging it. Moreover, although the application location of this foreign material capture | acquisition tool 10 is not specifically limited, It can use suitably, especially when discharging | emitting a gallstone in a bile duct and a pancreatic stone in a pancreatic duct. .

  When using the foreign object capturing tool 10, first, as shown in FIGS. 3B and 5B, the wire operating portion 53 of the operating tool 50 is slid toward the distal end side with respect to the main body 51, and the tube The plurality of skeleton wires 30 and the cover 40 are reduced in diameter by extruding the operation wire 20 with respect to 15.

  In this state, as shown in FIGS. 3A and 5A, the sheath operating portion 52 is slid toward the distal end side with respect to the main body 51, and a plurality of skeletal wire rods are placed in the first lumen 46 of the sheath 45. 30 and the cover 40 are accommodated. In addition, the guide wire 1 is inserted into the second lumen 47 of the sheath 45 from the guide wire insertion portion 48.

  Then, as shown in FIG. 7, the endoscope 5 is moved from the oral cavity through the stomach or the like to a large-diameter tubular organ V1 such as the duodenum by a known method, and the distal end portion of the endoscope 5 is moved to the tubular organ. It arrange | positions in the vicinity of the branch part N (nipple) of V2 and V3.

  Thereafter, the foreign object capturing tool 10 is inserted into a lumen (not shown) of the endoscope 5 and from the distal end opening of the lumen of the endoscope 5 through the distal end opening of the second lumen 47 of the sheath 45 of the foreign object capturing tool 10. The guide wire 1 is inserted, the guide wire 1 is inserted into the bile duct V2, and the F in which a plurality of foreign matters G are present (hereinafter referred to as “foreign matter existing portion F”) is allowed to pass, and the tip portion is made to be a foreign matter. A position that passes through the existence part F is reached. Thereafter, the sheath 45 is moved while visually recognizing with the endoscope 5 along the guide wire 1, and the tip portion thereof reaches the front of the foreign substance existing portion F (see FIG. 7).

  In this state, as shown in FIGS. 3 (b) and 5 (b), when the sheath operating portion 52 of the operating tool 50 is slid to the proximal end side with respect to the main body 51, the first lumen 46 of the sheath 45. The plurality of skeleton wires 30 and the cover 40 protrude from the front end opening.

  Then, as shown in FIG. 8, the entire foreign material capturing tool 10 is pushed in, and the plurality of skeleton wires 30 and the cover 40 are moved to a position where the foreign material existing portion F has passed.

  In the above state, as shown in FIGS. 4 (a) and 6 (a), when the wire operation portion 53 of the operation tool 50 is slid toward the base end side with respect to the main body 51, the plurality of skeleton wires 30 are radially formed. As the cover 40 spreads, the cover 40 spreads in a basket shape, and its proximal end opening opens.

  When the entire foreign matter catching tool 10 is pulled in this state, the foreign matter G can be received into the cover 40 from the proximal end opening of the cover 40 and captured as shown in FIG.

  At this time, since the plurality of skeleton wires 30 spread radially and the resin cover 40 spreads to form a basket shape, the peripheral edge of the relatively soft cover 40 is in close contact with the inner periphery of the tubular organ V2. The trapping property of the foreign matter G can be improved.

  In addition, the cover 40 has a basket shape in which the base end portion side is greatly opened in a state where the skeleton wire 30 is spread radially, and a gap between the plurality of skeleton wires 30 is widely open. Even foreign matter G such as can be smoothly captured in the cover 40.

  When the cover 40 is made of polyurethane and has a thickness of 2 to 200 μm, when the cover 40 is expanded or contracted by pushing and pulling the operation wire 20, the cover 40 Can be made difficult to tear, and the cover 40 can be flexibly deformed to make it more intimately contacted with the inner periphery of the tubular organ V2.

  As described above, after the foreign matter G is captured by the cover 40, the entire foreign matter capturing tool 10 is further pulled back to the proximal side, and a plurality of skeletal wire rods up to the tubular organ V1 having a larger diameter than the tubular organ V2 (for example, the duodenum). 30 and the cover 40 are moved (see FIG. 10).

  Then, at that position, as shown in FIGS. 4B and 6B, when the wire operation portion 53 of the operation tool 50 is further slid toward the base end side with respect to the main body 51, a plurality of skeleton wires 30 are obtained. The diameter of the axially intermediate portion of the cover 40 is further increased, and the concave curved portion 35 presses the outer surface between the outer periphery and the center portion of the front end portion of the cover 40, thereby squeezing the cover 40 into a flat state. As a result, the foreign matter G captured in the cover 40 is smoothly pushed out from the proximal end opening of the cover 40 and can be discharged into the tubular organ V1 as shown in FIG. If the foreign matter G cannot be sufficiently discharged by the above operation, the cover 40 is opened and closed by repeatedly reciprocatingly sliding the wire operation portion 53 with respect to the main body 51 in the axial direction, so that the foreign matter G is placed inside the cover 40. Can be effectively discharged.

  Further, in this embodiment, since the plurality of skeleton wires 30 are radially spread, the convex curved portion 34 and the concave curved portion 35 are provided, and the entire curved shape is curved in an S shape. As described above, when the wire operation portion 53 is slid to the proximal side in the axial direction, the concave curved portion 35 of each skeleton wire 30 pushes the outer surface between the outer periphery and the center portion of the distal end portion of the cover 40. As shown in FIGS. 4B and 6B, the cover 40 has a flat shape, and the foreign matter G trapped inside can be more easily discharged.

  As shown in FIGS. 6B and 11, when the wire operating portion 53 is further slid toward the base side with respect to the main body 51 from the state in which the cover 40 is crushed into a flat shape, the cover 40 Since the outer surface side is deformed so that it is turned over to the opposite side, the foreign matter G captured in the cover 40 can be discharged more effectively.

  FIG. 12 shows another embodiment of the foreign body capturing tool in a body cavity according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 12A and 12B, the foreign body capturing tool 10a in the body cavity in this embodiment (hereinafter referred to as “foreign body capturing tool 10a”) is configured such that the skeletal wire 30 extends from the tube 15 and the tip thereof. Four are arranged at equal intervals on the outer periphery of the protruding operation wire 20, and a basket-like cover 40 is fixed to these skeleton wire rods 30 via fixing portions 33.

  In this embodiment, since the four skeleton wire rods 30 are arranged at equal intervals on the outer periphery of the basket-like cover 40, the cover 40 can be stably spread into a basket shape. Further, when the operation wire 20 is operated to push the outer surface of the front end side of the cover 40 with the concave curved portion 35, the four circumferential positions of the cover 40 can be pushed with an equal pressing force. The captured foreign matter G can be discharged more smoothly.

10, 10a Foreign body capturing device in a body cavity (foreign material capturing device)
15 Tube 20 Operation wire 30 Skeletal wire 31 Base end portion 32 Tip portion 34 Convex curved portion 35 Concave curved portion 40 Cover 45 Sheath 50 Operating tool

Claims (3)

Tubes,
An operation wire inserted through the tube;
A plurality of skeletal wires extending radially when the proximal end is coupled to the distal end of the tube, the distal end is coupled to the distal end of the operation wire, and the operation wire is in a predetermined operation position;
The outer periphery is fixed to the plurality of skeleton wires, the operation wire is inserted in the center, and the plurality of skeleton wires are radially spread, and the base end side opens to form a basket shape capable of catching foreign matters. With a resin cover,
In a state where the plurality of skeleton wires are radially spread, a concave curved portion that is close to the outer surface of the cover on the tip side is provided on the tip side of the portion of the skeleton wire that is fixed to the cover. And
When the operation wire is further pulled toward the proximal end side with respect to the tube, the concave curved portion of the skeletal wire is configured to push the outer surface on the distal end side of the cover. Inside foreign material capture tool.   In a state where the plurality of skeleton wires are radially expanded, a convex curved portion that protrudes toward the distal end side and returns to the proximal end side from the portion where the cover of each skeleton wire is fixed, and a base The foreign body capturing tool in a body cavity according to claim 1, wherein a concave curved portion that returns to the end portion side and protrudes toward the distal end portion side is provided, and is curved in an S shape as a whole.   The foreign body capturing tool in a body cavity according to claim 1 or 2, wherein the cover is made of polyurethane and has a thickness of 2 to 200 µm.