Gastrostomy catheter kit and connecting tube

Abstract

To provide a gastrostomy catheter kit and connecting tube capable of further reliably maintaining a state where a gastrostomy catheter is placed in the stomach.SOLUTION: A gastrostomy catheter kit 300 comprises a gastrostomy catheter 100 and a connecting tube (a tube 200) being detachably connected to the gastrostomy catheter 100. The gastrostomy catheter kit 300 is so configured that the gastrostomy catheter 100 includes a shaft 10 in which a lumen 11 is formed, and a body surface contact part 20 provided at one end of the shaft 10, and the connecting tube includes a long tube body 260, and a connector 210 provided at one end of the tube body 260 and detachably attached to the body surface contact part 20, where the tube body 260 has an extension part 270 that can extend when being pulled.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a gastrostomy catheter kit and a connecting tube. [Background technology]

[0002] An example of a gastrostomy catheter kit is described in Patent Document 1. The gastrostomy catheter in Patent Document 1 has a shaft with a lumen formed therein and a body surface contact part (referred to as a body surface part in the document) provided at one end of the shaft, and the tube has a long tube main body and a connector provided at one end of the tube main body and detachably attached to the body surface contact part, and the outer diameter and inner diameter of the tube are constant regardless of its position in the axial direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-188846 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the investigations of the present inventors, the gastrostomy catheter kit of Patent Document 1 still has room for improvement in terms of the structure for more reliably maintaining the gastrostomy catheter indwelled in the stomach.

[0005] The present invention has been made in view of the above-mentioned problems, and provides a gastrostomy catheter kit and a connection tube that are structured to more reliably maintain the state in which a gastrostomy catheter is placed in the stomach. [Means for solving the problem]

[0006] According to the present invention, there is provided a gastrostomy catheter kit comprising a gastrostomy catheter and a connection tube detachably connected to the gastrostomy catheter, The gastrostomy catheter has a shaft having a lumen formed therein and a body surface abutment portion provided at one end of the shaft, the connection tube has a long tube body and a connector provided at one end of the tube body and detachably attached to the body surface contact portion, The gastrostomy catheter kit is provided in which the tube body has an extension portion that can be extended when pulled.

[0007] According to the present invention, there is also provided a connection tube that is detachably connected to a body surface abutment portion of a gastrostomy catheter having a shaft with a lumen formed therein and a body surface abutment portion provided at one end of the shaft, the connection tube comprising: A long tube body, a connector provided at one end of the tube body and detachably attached to the body surface contact portion; and The tube body is provided with a connecting tube having an extension that is extendable when pulled. [Effects of the Invention]

[0008] According to the present invention, the gastrostomy catheter can be more reliably maintained in the stomach. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a longitudinal cross-sectional view of the gastrostomy catheter kit according to the first embodiment, showing a state in which the connector is connected to the body surface contact part. [Figure 2] FIG. 2 is a longitudinal cross-sectional view of the gastrostomy catheter kit according to the first embodiment, showing the state before the connector is connected to the body surface contact part. [Figure 3] 3(a) and 3(b) are views showing the engaged portion of the gastrostomy catheter and its surrounding structure in the first embodiment, with FIG. 3(a) being a perspective view and FIG. 3(b) being a plan view. [Figure 4]Figures 4(a), 4(b), and 4(c) are diagrams showing the connector in the first embodiment, where Figure 4(a) is a perspective view, Figure 4(b) is a bottom view, and Figure 4(c) is a side view. [Figure 5] 5(a) and 5(b) are side views showing the connector and the engaged portion of the gastrostomy catheter in the first embodiment and their surrounding structure. Of these, FIG. 5(a) shows the state before the connector is connected to the body surface contact portion, and FIG. 5(b) shows the state after the connector has been connected to the body surface contact portion from the state shown in FIG. 5(a). [Figure 6] FIG. 6(a) is a vertical cross-sectional view showing one of the claws and its surrounding structure in the first embodiment, and FIG. 6(b) is a vertical cross-sectional view showing the other of the claws and its surrounding structure. [Figure 7] Figure 7(a) shows the state in the first embodiment where the body surface contact portion is placed against the body surface and the connector is attached to the body surface contact portion, and Figure 7(b) shows the state in which, from the state shown in Figure 7(a), the part of the connector that is offset from the axial center of the shaft is pulled in a direction that is a combination of the offset direction and the axial direction of the shaft. [Figure 8] Figure 8(a) is a side view showing the state in which the body surface contact portion in the first embodiment is placed on the body surface and the connector is attached to the body surface contact portion, and Figure 8(b) is a side view showing the state in which the tube is pulled horizontally from the state shown in Figure 8(a) and the extension portion is extended. [Figure 9] Figure 9(a) is a side view showing a state in which the body surface contact portion in a modified example of the first embodiment is placed against the body surface and the connector is attached to the body surface contact portion, and Figure 9(b) is a side view showing a state in which the tube is pulled horizontally from the state shown in Figure 9(a) and the extension portion is extended. [Figure 10] Figure 10(a) is a plan view showing the state in which the body surface contact portion in the second embodiment is placed against the body surface and the connector is attached to the body surface contact portion, and Figure 10(b) is a plan view showing the state in which the tube is pulled horizontally from the state shown in Figure 10(a) and the extension portion is extended. [Figure 11]Figure 11(a) is a plan view showing the state in which the body surface contact portion in the third embodiment is placed on the body surface and the connector is attached to the body surface contact portion, and Figure 11(b) is a plan view showing the state in which the tube is pulled horizontally from the state shown in Figure 11(a) and the extension portion is extended. [Figure 12] Figure 12(a) is a plan view showing the state in which the body surface contact portion in the fourth embodiment is placed against the body surface and the connector is attached to the body surface contact portion, Figure 12(b) is a plan view showing the state in which the tube is pulled horizontally from the state shown in Figure 12(a) and the first extension portion is extended, and Figure 12(c) is a plan view showing the state in which the tube is further pulled horizontally from the state shown in Figure 12(b) and the second extension portion is extended. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0011] [First embodiment] First, the first embodiment will be described with reference to Figures 1 to 8(b), where Figure 1 is a cross-sectional view taken along line AA shown in Figure 3(b). The various components of the gastrostomy catheter kit 300 of the present invention do not need to be independent entities. It is acceptable for multiple components to be formed as a single member, for one component to be formed from multiple members, for one component to be part of another component, or for part of one component to overlap with part of another component, etc. 1 will be referred to as "downward" and "upward" in the following description. The axial direction of the shaft 10 will sometimes be referred to simply as the "axial direction," and the radial direction of the shaft 10 will sometimes be referred to simply as the "radial direction." The circumferential direction of the shaft 10 will sometimes be referred to simply as the "circumferential direction."

[0012] A gastrostomy catheter kit 300 according to this embodiment includes a gastrostomy catheter 100 and a connection tube (tube 200) that is detachably connected to the gastrostomy catheter 100. As shown in FIG. 1, the gastrostomy catheter 100 has a shaft 10 in which a lumen 11 is formed, and a body surface contact portion 20 provided at one end of the shaft 10. The connection tube (tube 200) has a long tube main body 260 and a connector 210 that is provided at one end of the tube main body 260 and is detachably attached to the body surface contact portion 20. As shown in Figures 8(a) and 8(b), the tube body 260 has an extension 270 that is extendable when pulled.

[0013] 7(a) and 7(b), the gastrostomy catheter 100 is placed in the stomach while being inserted through a fistula 430 formed by penetrating an abdominal wall 410 and a stomach wall (not shown). In this state, the gastrostomy catheter 100 communicates between the inside of the stomach and the outside of the living body, and liquids such as nutrients are injected into the stomach via the tube 200 and the gastrostomy catheter 100.

[0014] With this configuration, even if the tube 200 is pulled in its extension direction, the pulling force can be absorbed by the extension of the extension section 270. Therefore, it is possible to more reliably prevent the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430.

[0015] Furthermore, as shown in Figure 7(a), when the connector 210 is attached to the body surface contact portion 20, when a portion 211 of the connector 210 located on the axial center AX of the shaft 10 (see Figures 7(a) and 7(b), etc.) is pulled in the axial direction of the shaft 10 (for example, in the direction of arrow A), the connector 210 is prevented from being detached from the body surface contact portion 20. Also, as shown in Figure 7(b), when a portion 212 of the connector 210 that is offset from the axial center AX of the shaft 10 (see Figures 7(a) and 7(b), etc.) is pulled in a direction that is a combination of the offset direction and the axial direction of the shaft 10 (for example, the direction of arrow B), the connector 210 detaches from the body surface abutment portion 20. In other words, the force required to pull and separate the portion 211 on the axial center AX of the shaft 10 in the axial direction of the shaft 10 in the connector 210 is greater than the force required to pull and separate the portion 212 offset from the axial center AX of the shaft 10 in the connector 210 in the combined direction of the offset direction and the axial direction.

[0016] According to this embodiment, when a portion of the connector 210 that is offset from the axial center AX of the shaft 10 is pulled in a direction that is a combination of the offset direction and the axial direction, the connector 210 detaches from the body surface abutment portion 20. Therefore, for example, when the connector 210 is pulled in a direction that is a combination of the offset direction and the axial direction, the connector 210 can be quickly detached from the body surface abutment portion 20. Therefore, even if the connector 210 is pulled as described above, it is possible to prevent the gastrostomy catheter 100 from being pulled by the connector 210 and being unintentionally removed from the fistula 430. In other words, the gastrostomy catheter 100 can be more reliably maintained in a state in which it is placed in the stomach. On the other hand, when the portion of the connector 210 on the axial center AX of the shaft 10 is pulled in the axial direction of the shaft 10, the connector 210 is effectively prevented from detaching from the body surface abutment portion 20. For this reason, for example, when a liquid such as a nutrient is injected into the lumen 11 along the axial direction of the shaft 10, the connector 210 can be prevented from unintentionally detaching from the body surface abutment portion 20 and ultimately from the gastrostomy catheter 100 due to the pressure generated when the liquid is injected.

[0017] More specifically, in this embodiment, the tube body 260 of the tube 200 extends from the connector 210 in a direction intersecting the axial center AX of the shaft 10 (described in detail later), and the offset portion 212 described above is a portion of the connector 210 that is offset in the extension direction of the tube body 260. In other words, the offset direction is the extension direction of the tube body 260 from the connector 210. When the tube main body 260 is pulled in a direction that is a combination of the offset direction and the axial direction, the connector 210 of the tube 200 can be quickly detached from the body surface contact portion 20. Therefore, even if the tube main body 260 is pulled as described above, it is possible to prevent the gastrostomy catheter 100 from being pulled by the tube main body 260 and, ultimately, the connector 210, and being unintentionally removed from the fistula 430. In other words, it is possible to more reliably maintain the state in which the gastrostomy catheter 100 is placed in the stomach.

[0018] In this embodiment, the connector 210 has, for example, a connector body 220 and a pair of claw portions 250 that respectively protrude from the connector body 220 and engage with the body surface contact portion 20 . The body surface contact portion 20 has, for example, a pair of engaged portions 32 that are arranged spaced apart from each other around the axis of the shaft 10 and with which the pair of claw portions 250 engage one by one. The engagement force between one of the pair of claw portions 250 (hereinafter simply referred to as one claw portion 250a) and the engaged portion 32 is smaller than the engagement force between the other of the pair of claw portions 250 (hereinafter simply referred to as the other claw portion 250b) and the engaged portion 32. With this configuration, the engagement force between the pair of claws 250 and the engaged parts 32 allows the connector 210 to remain attached to the body surface contact part 20 during the injection of the nutrient solution. Furthermore, when the tube 200 is pulled in a direction that combines the offset direction and the axial direction, the engagement between the pair of claws 250 and the engaged parts 32 is released, starting from one of the claws 250a, allowing the connector 210 to quickly detach from the body surface contact part 20. This prevents the gastrostomy catheter 100 from being pulled by the tube 200 and being removed from the fistula 430. However, in the present invention, the engagement force between one claw portion 250a and the engaged portion 32 may be equal to the engagement force between the other claw portion 250b of the pair of claw portions 250 and the engaged portion 32.

[0019] As shown in FIG. 1, the gastrostomy catheter 100 includes, for example, the shaft 10, lumen 11, body surface contact portion 20, and engaged portion 32 described above, as well as a connected member 30 on which the engaged portion 32 is formed, a bumper 50 provided at the lower end of the shaft 10, and a capsule cover (not shown) that maintains the bumper 50 in a contracted state. In this embodiment, the bumper 50 can be expanded by detaching the capsule cover from the bumper 50. This causes the bumper 50 to be anchored to the stomach wall, and the gastrostomy catheter 100 is placed in place. In this state, the gastrostomy catheter 100 communicates between the inside of the stomach and the outside of the living body, and liquids such as nutrients can be injected into the stomach through the gastrostomy catheter 100. In addition, FIG. 1 shows the bumper 50 in an expanded state.

[0020] In this embodiment, the inner cavity of the shaft 10 forms a lumen 11 . As shown in Figure 1, the shaft 10 is formed in a cylindrical shape with its axial direction extending vertically. The outer diameter of the lower end of the shaft 10 tapers downward in two stages, for example. The outer diameter of the upper end of the shaft 10 is relatively larger than the outer diameter of the other parts of the shaft 10. A coupled member 30 is attached to the upper end of the shaft 10. The body surface contact portion 20 is the portion exposed to the body surface of the user when the gastrostomy catheter 100 is indwelling, and the lower surface of the body surface contact portion 20 faces the outer surface of the abdominal wall 410. The body surface contact portion 20 protrudes laterally from the outer peripheral surface of the upper end of the shaft 10, for example. The lower surface of the body surface contact portion 20 is formed flat. In this embodiment, the body surface contact portion 20 includes a connected member 30 , and the connector 210 of the tube 200 is connected to the body surface contact portion 20 via the connected member 30 . 1 is formed on the body surface contact portion 20. The plug member 82 can be inserted into the upper end of the check valve 40 to close the opening 31 on the upper end side of the connected member 30.

[0021] The shaft 10 and the body surface contact portion 20 are integrally molded from, for example, a resin material. The resin material is not particularly limited, but examples thereof include polyvinylidene fluoride resin, polytetrafluoroethylene resin, polyethylene resin, polypropylene resin, silicone rubber, and other rubber materials. Similarly, the connected member 30 is integrally molded from, for example, a resin material. The resin material is not particularly limited, but examples thereof include polyvinylidene fluoride resin, polytetrafluoroethylene resin, polyethylene resin, polypropylene resin, silicone rubber, and other rubber materials.

[0022] The capsule cover is formed, for example, in a cylindrical shape with a bottom and an axial direction extending in the vertical direction. The capsule cover is attached to the lower end of the shaft 10, and before the gastrostomy catheter 100 is placed, the bumper 50 is housed in a contracted state inside the capsule cover. The material constituting the capsule cover is not particularly limited, but examples thereof include edible cellulose-based or gelatin-based materials, and materials that decompose in the body, such as polylactic acid.

[0023] The bumper 50 is flexible and can expand radially. A portion of a wire (not shown) is arranged in a coiled manner inside the bumper 50. One end of the wire is introduced into the bumper 50 through an introduction hole 12 (see FIG. 2, etc.) formed in the shaft 10, and the other portion is led to the outside of the bumper 50 via the introduction hole 12. When the capsule cover is detached from the bumper 50, the bumper 50 expands radially due to the elastic restoring force of the wire and is locked to the stomach wall. Then, from this state, when the wire inside the bumper 50 is removed from the bumper 50, the bumper 50 contracts radially and is released from the locking of the bumper 50 to the stomach wall. The gastrostomy catheter 100 may include, for example, a balloon (not shown) instead of the bumper 50. In this case, saline, distilled water, or the like is injected into the balloon, causing the balloon to expand and become anchored to the stomach wall. Then, by expelling the saline, distilled water, or the like from the balloon, the balloon contracts and is released from the engagement of the balloon with the stomach wall.

[0024] Furthermore, the gastrostomy catheter 100 is equipped with, for example, a check valve 40 (see FIG. 1), which allows nutrients to pass from outside the body into the stomach while preventing stomach contents from flowing back out of the body. In the present embodiment, the check valve 40 is a duckbill valve, for example. More specifically, the check valve 40 is made of a material such as silicone rubber and is configured to be compressively deformable (elastically deformable). The check valve 40 is fitted into the inner cavity of the upper end of the lumen 11, for example. The check valve 40 normally closes the opening at the upper end of the lumen 11, and when nutrients or the like are injected into the stomach via the gastrostomy catheter 100, it connects the lumen 11 to the outside of the body.

[0025] 1, the connected member 30 is formed, for example, in the shape of a flat tube whose axial dimension is smaller than its radial dimension. The connected member 30 includes a cylindrical main body 30b and an inner flange 30a that protrudes radially inward from the upper end of the main body 30b. The inner peripheral edge of the inner flange 30a defines an opening 31 at the upper end of the connected member 30. The outer diameter of the opening 31 is set to be larger than that of a tubular portion 240 of the connector 210, which will be described later. As shown in FIGS. 7( a ) and 7 ( b ), when the connector 210 is attached to the body surface contact portion 20 , the connectable member 30 is disposed between the pair of claw portions 250 .

[0026] When injecting a liquid such as a nutrient into the stomach via the gastrostomy catheter 100, the plug member 82 is removed from the opening 31 and the connector 210 is connected to the body surface contact portion 20. The tube 200 connects the lumen 11 of the gastrostomy catheter 100 to the outside of the living body, and a liquid such as a nutrient is injected into the lumen 11 and ultimately into the stomach via the tube 200. As described above, the connection tube (tube 200) is a connection tube that is used by being detachably connected to the body surface contact portion 20 of the gastrostomy catheter 100, which has a shaft 10 in which a lumen 11 is formed and a body surface contact portion 20 provided at one end of the shaft 10. The tube 200 has a long tube body 260 and a connector 210 provided at one end of the tube body 260 and detachably attached to the body surface contact portion 20 . The tube body 260 has an extension 270 that is expandable when pulled. With this configuration, even if the tube 200 is pulled in its extension direction, the pulling force can be absorbed by the extension of the extension section 270. Therefore, it is possible to more reliably prevent the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430. Furthermore, when the connector 210 is attached to the body surface contact portion 20, and a portion 211 of the connector 210 located on the axial center AX of the shaft 10 is pulled in the axial direction of the shaft 10, the connector 210 is prevented from coming off the body surface contact portion 20. When a portion 212 of the connector 210 that is offset from the axial center AX of the shaft 10 is pulled in a direction that is a combination of the offset direction and the axial direction of the shaft 10, the connector 210 detaches from the body surface contact portion 20. With this configuration, as described above, when the portion 211 of the connector 210 on the axial center AX of the shaft 10 is pulled in the axial direction of the shaft 10, the connector 210 is effectively prevented from detaching from the body surface contact portion 20. On the other hand, when the portion 212 of the connector 210 offset from the axial center AX of the shaft 10 is pulled in a direction that is a combination of the offset direction and the axial direction, the connector 210 of the tube 200 can be quickly detached from the body surface contact portion 20. This prevents the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430, and more reliably maintains the gastrostomy catheter 100 indwelling in the stomach.

[0027] The tube main body 260 is formed, for example, in the shape of a tube that is long in one direction. 1, the outer diameter of one end of tube body 260 in the longitudinal direction is set to be approximately equal to the outer diameter of engagement hole 223 of connector 210. One end of tube body 260 engages with engagement hole 223, whereby tube body 260 is connected to connector 210. The inner cavity of the tube main body 260 communicates with a communication hole 221 (described in detail later) of the connector 210. When the connector 210 is connected to the body surface contact part 20, the inner cavity of the tube main body 260 communicates with the lumen 11 of the gastrostomy catheter 100 via the communication hole 221. The tube main body 260 connected to the connector 210 is pulled out in a direction intersecting (more specifically, perpendicular to) the axis of the shaft 10.

[0028] The connector 210 is integrally molded from, for example, a resin material. The resin material is not particularly limited, but examples thereof include polyvinylidene fluoride resin, polytetrafluoroethylene resin, polyethylene resin, polypropylene resin, silicone rubber, or other rubber materials.

[0029] As shown in Figures 4(a), 4(b), and 4(c), the connector 210 has, for example, a connector body 220, a tubular portion 240 protruding from the connector body 220, and a pair of claw portions 250 protruding from the connector body 220. The connector main body 220 is formed, for example, in the shape of a substantially rectangular parallelepiped that is elongated in the radial direction. However, the connector main body 220 has a shape that gradually tapers from the center in the longitudinal direction of the connector main body 220 toward one side (one side in the longitudinal direction). More specifically, in a plan view, the width dimension of the connector main body 220 gradually narrows from the center in the longitudinal direction toward one side. Furthermore, in a side view, for example, the upper surface of the connector main body 220 slopes downward in an arc shape from the center in the longitudinal direction of the connector main body 220 toward one side. When the connector 210 is attached to the body surface contact portion 20 , the tubular portion 240 is inserted into the inner cavity of the check valve 40 of the connected member 30 . The tubular portion 240 is formed, for example, in a cylindrical shape that protrudes downward from the lower surface of the connector body 220 . Tubular portion 240 is disposed, for example, in the central portion in the longitudinal direction of connector main body 220. In other words, both ends in the longitudinal direction of connector main body 220 each protrude radially outward beyond tubular portion 240. The outer diameter of the tubular portion 240 is set to be, for example, approximately equal to the inner diameter of the check valve 40, so that when inserted into the lumen of the check valve 40, the outer peripheral surface of the tubular portion 240 comes into surface contact with the inner peripheral surface of the check valve 40. This makes it possible to easily engage the tubular portion 240 with the check valve 40. When the tubular portion 240 is inserted into the lumen of the check valve 40, the tubular portion 240 is disposed coaxially with the check valve 40 and, ultimately, with the shaft 10. Here, in the case of this embodiment, when the portion 212 of the connector 210 that is offset from the axial center AX of the shaft 10 is pulled in a direction that is a combination of the offset direction (the extension direction of the tube main body 260) and the axial direction of the shaft 10, the tubular portion 240 is able to move relative to the offset side of the axial center AX of the shaft 10. More specifically, as described above, the check valve 40 is made of a material such as silicone rubber and is capable of undergoing compressive deformation (elastic deformation). Therefore, when the portion 212 of the connector 210 that is offset from the axial center AX of the shaft 10 is pulled in a direction that is a combination of the offset direction and the axial direction of the shaft 10, the check valve 40 is compressed and deformed in the radial direction between the outer surface of the tubular portion 240 and the inner surface of the shaft, allowing the tubular portion 240 to move relative to the offset side of the axial center AX of the shaft 10.

[0030] 1, the connector body 220 has a communication hole 221 formed therein that communicates with the lumen of the tubular portion 240. The shaft 10 of the gastrostomy catheter 100 communicates with the lumen of the tube 200 via the communication hole 221. The communicating hole 221 has, for example, a shape obtained by turning a substantial L upside down in a side view, and includes a first portion extending vertically and a second portion extending radially from the upper end of the first portion. The lower end of the lumen of the first portion of the communicating hole 221 is continuous with the upper side of the lumen of the tubular portion 240. The inner diameter of the first portion of the communicating hole 221 is set to, for example, a dimension equivalent to the inner diameter of the tubular portion 240. Furthermore, the outer diameter of the end of the second portion of the communicating hole 221 opposite to the side connected to the first portion is formed to be relatively larger than the other portions, for example, and this end serves as an engagement hole 223 with which the tip end of the tube main body 260 engages. The axial direction of the engagement hole 223 is perpendicular to the axial direction of the shaft 10. Therefore, the tip end of the tube main body 260 is also perpendicular to the axial direction of the shaft 10.

[0031] In this embodiment, in the connector main body 220, the portion that protrudes to one side in the radial direction based on the axis of the tubular portion 240 and the portion that protrudes to the other side in the radial direction are collectively referred to as a pair of protruding portions 231. The engagement hole 223 with which the tube main body 260 engages is opened at the tip of one of the pair of overhanging portions 231 , and the tube main body 260 extends from that one overhanging portion 231 . Of the pair of protrusions 231, one claw portion 250a protrudes downward from the tip of the protrusion 231 on the tube main body 260 side, and the other claw portion 250b protrudes downward from the tip of the protrusion 231 on the opposite side from the tube main body 260 side. As shown in Figures 4(a), 4(b) and 4(c), each of the pair of claw portions 250 has a base portion 252 that protrudes from the connector main body 220 toward the body surface side in the axial direction of the shaft 10 (more specifically, the direction in which the shaft 10 extends from the body surface abutment portion 20 (downward in Figures 1 and 2)), and a tip portion 254 that protrudes from the base portion 252 toward the axial center AX of the shaft 10. More specifically, each of the pair of claw portions 250 has a base portion 252 that protrudes from the connector body 220 in the same direction as the protruding direction of the tubular portion 240, and a tip portion 254 that protrudes from the base portion 252 toward the tubular portion 240. In the present embodiment, the pair of overhanging portions 231 are disposed at positions different from each other around the axis of the tubular portion 240, for example. More specifically, for example, they are disposed at positions rotationally symmetrical by 180 degrees with respect to each other, with the axis of the tubular portion 240 as the reference. Similarly, the pair of base portions 252 are disposed at positions rotationally symmetrical by 180 degrees with respect to each other, with the axis of the tubular portion 240 as the reference, and the pair of claw portions 250 are also disposed at positions rotationally symmetrical by 180 degrees with respect to each other, with the axis of the tubular portion 240 as the reference. The lower surface of each of the pair of overhanging portions 231 is formed flat except for the portion where the corresponding base portion 252 is formed. In addition, the lower surface of each of the pair of overhanging portions 231 is perpendicular to the axial direction. In this embodiment, a base portion 252 protrudes downward from each tip portion (tip in the protruding direction) of the pair of protruding portions 231. The upper portion of the base portion 252 gradually widens toward the protruding portion 231. The lower portion of the base portion 252 is approximately constant regardless of its position in the up-down direction. This makes it possible to suppress stress concentration at the boundary between the protruding portion 231 and the base portion 252. Furthermore, each of the tip portions 254 protrudes radially inward from the lower end of the base portion 252. The tip surface (the tip in the protruding direction) of each tip portion 254 is, for example, a flat surface perpendicular to the radial direction. Similarly, the upper end surface of each of the claw portions 250 is a flat surface perpendicular to the axial direction.

[0032] As described above, in this embodiment, the pair of claw portions 250 are inserted into and locked into the pair of engaged portions 32 (more specifically, the connected members 30) of the body surface contact portion 20, for example. 3(a) and 3(b), each of the pair of engaged portions 32 is, for example, a groove recessed radially inward and extending circumferentially. The other circumferential end of each engaged portion 32 reaches the upper end of the body surface contact portion 20 (more specifically, the connected member 30) and opens upward. That is, an opening 32a is formed at the upper end of each engaged portion 32. The pair of engaged portions 32 are arranged at positions rotationally symmetrical to each other by 180 degrees with respect to the axis of the shaft 10 as the reference, and are rotationally symmetrical to each other. Each of the pair of engaged portions 32 is formed, for example, in an arc shape with the axis of the shaft 10 as its center. The central angle of each of the pair of engaged portions 32 is not particularly limited, but is preferably, for example, 90 degrees or more and 180 degrees or less, and more preferably 120 degrees or more and 180 degrees or less.

[0033] At the upper end of the body surface abutment portion 20 (more specifically, the connected member 30), the portions that define the engaged portions 32 and that are regions where the openings 32a are not formed serve as falling-off prevention portions 34 against which the corresponding claw portions 250 come into contact. The lower surfaces of the falling-off prevention portions 34 form the top surfaces of the engaged portions 32. The lower surfaces of the falling-off prevention portions 34 (top surfaces of the engaged portions 32) are formed flat. Further, at the other end 32c of the engaged portion 32, for example, a locking projection 33 is formed, which protrudes radially outward from the outer surface 32d of the engaged portion 32. The protruding length (diametric dimension) of the locking projection 33 is set to a dimension smaller than the formation depth of the engaged portion 32, for example.

[0034] As shown in Figures 5(a) and 5(b), for example, by inserting a pair of claw portions 250 into the body surface contact portion 20 from above and rotating the tubular portion 240 in one direction around the axis, the connector 210 is hooked onto the connected member 30 and ultimately the body surface contact portion 20 in a state where the pair of claw portions 250 are prevented from falling off upward from the corresponding engaged portion 32.

[0035] More specifically, to hook the connector 210 to the body surface contact portion 20, first, the pair of claw portions 250 are inserted into the body surface contact portion 20 from above, and the tubular portion 240 of the connector 210 is inserted into the lumen of the check valve 40 through the opening 31 of the connected member 30. At this time, each claw portion 250 is inserted into the corresponding engaged portion 32 from the opening 32a of the engaged portion 32 and is positioned at the other end 32c of the engaged portion 32. In this state, the tip surface of each claw portion 250 abuts against the outer surface 32d of the corresponding engaged portion 32. Next, the connector 210 and the body surface contact portion 20 are rotated relative to each other around the axis. For example, when the connector 210 is rotated in the direction of the arrow shown in FIG. 5( b ) (for example, clockwise), each of the claws 250 is guided by the outer surface 32 d and moves from the other end 32 c of the engaged portion 32 toward the one end 32 b. This rotation is continued until each of the claws 250 moves over the corresponding locking projection 33. In this state, the upper end surface of the tip end 254 of each of the claws 250 faces the lower surface of the corresponding drop-off prevention portion 34. When the portion of the connector 210 on the axial center AX of the shaft 10 is pulled upward, the upper end surface of the tip end 254 of each of the claws 250 comes into contact with the lower surface of the corresponding drop-off prevention portion 34, thereby preventing the claws 250 from dropping upward from the corresponding engaged portion 32. In this way, the connector 210 is hooked onto the connected member 30 and ultimately onto the body surface contact portion 20, and the tube 200 is attached to the gastrostomy catheter 100.

[0036] When removing the tube 200 from the gastrostomy catheter 100, the connector 210 is rotated around its axis in the opposite direction to one direction, and the pair of claws 250 are pulled upward through the openings 32a from the engaged portion 32. This separates the connector 210 from the connected member 30 and, ultimately, the body surface contact portion 20. More specifically, from a state in which the pair of claws 250 are restricted from falling off upward relative to the corresponding engaged portions 32 (the state shown in FIG. 5(b)), by rotating the connector 210 in the direction opposite to the arrow shown in FIG. 5(b) (for example, counterclockwise), each claw 250 is guided by the outer surface 32d and moves in an arc from one end 32b toward the other end 32c of the corresponding engaged portion 32. This rotation is continued until each claw 250 moves to a position corresponding to the opening 232a. From this state, by pulling the pair of claws 250 upward from the engaged portions 32, the connector 210 is separated from the body surface abutment portion 20, and the tube 200 can be removed from the gastrostomy catheter 100 at the intended timing.

[0037] In this embodiment, the rotation angle of the tubular portion 240 from when the claw portion 250 is inserted into the engaged portion 32 until when it is locked by the locking projection 33 is less than 45 degrees. This makes it possible to quickly prevent the pair of claw portions 250 from falling off the engaged portion 32 by rotating the tubular portion 240. More specifically, in the engaged portion 32, the central angle of the portion from the other end (the end on the other end 32c side) in the circumferential direction of the engaged portion 32 to the end on the one end 32b side of the locking projection 33 is set to, for example, less than 45 degrees. As a result, the rotation angle of the tubular portion 240 from when the claw portion 250 is inserted into the engaged portion 32 to when the claw portion 250 is locked by the locking projection 33) is less than 45 degrees. In the case of this embodiment, as an example, the rotation angle of the tubular portion 240 from when the claw portion 250 is inserted into the engaged portion 32 until when it is locked by the locking projection 33 is approximately 35 degrees. Furthermore, in this embodiment, the rotation angle of the tubular portion 240 from when the claw portion 250 is locked by the locking projection 33 until it reaches one end of the engaged portion 32 (the end on the one end portion 32b side) is 90 degrees or more. More specifically, in the engaged portion 32, the central angle of the portion from the end of the locking protrusion 33 on the one end 32b side to one end of the engaged portion 32 in the circumferential direction (the end on the one end 32b side) is set to, for example, greater than or equal to 90 degrees and less than or equal to 180 degrees. This allows the tubular section 240, and therefore the connector 210, to be rotated around the axis relative to the body surface contact section 20 within an angle range of 90 degrees or more to 180 degrees or less while maintaining the connector 210 connected to the gastrostomy catheter 100. In other words, by adjusting the rotation phase of the connector 210 around the axis, the radial extension direction of the tube 200 can be adjusted appropriately. In the present embodiment, for example, the rotational phase of the connector 210 around the axis can be adjusted within an angular range of approximately 120 degrees.

[0038] Here, in this embodiment, as shown in Figures 4(c), 6(a) and 6(b), the protruding length L1 of the tip 254 from the base 252 of one claw portion 250a is smaller than the protruding length L2 of the tip 254 from the base 252 of the other claw portion 250b. As a result, the engagement force between the pair of claws 250 and the engaged parts 32 allows the connector 210 to remain attached to the body surface contact part 20 during the injection of the nutrient solution. Furthermore, when the tube 200 is unintentionally pulled in its extension direction, the engagement between the pair of claws 250 and the engaged parts 32 is released, starting from one of the claws 250a, allowing the connector 210 to quickly detach from the body surface contact part 20. This prevents the gastrostomy catheter 100 from being pulled by the tube 200 and being removed from the fistula 430. 4(a) to 4(c), of the pair of overhanging portions 231, the protruding length L1 of the claw portion 250a protruding from the overhanging portion 231 on the tube main body 260 side is smaller than the protruding length L2 of the claw portion 250b protruding from the overhanging portion 231 on the opposite side from the tube main body 260 side. In other words, the engagement force between the claw portion 250a protruding from the overhanging portion 231 on the tube main body 260 side and the engaged portion 32 is smaller than the engagement force between the claw portion 250b protruding from the overhanging portion 231 on the opposite side from the tube main body 260 side and the engaged portion 32. The "engaging force" referred to here is the depth of engagement of the claw portion 250 with the engaged portion 32. 7(b), when the tube 200 is pulled in a direction that combines the offset direction and the axial direction, one of the claws 250a (on the tube main body 260 side) first disengages from the engaged portion 32. This more reliably prevents the gastrostomy catheter 100 from being pulled by the tube 200 and being removed from the fistula 430. In this embodiment, the protruding length L1 of one claw portion 250a is preferably 1 / 10 to 1 / 2 of the protruding length L2 of the other claw portion 250b, and more preferably 1 / 5 to 1 / 3 of the protruding length L2. The depth (diametric dimension) of each engaged portion 32 is set to, for example, approximately the same as the protruding length L2 of the other claw portion 250b. That is, the depth (diametric dimension) of each engaged portion 32 is, for example, greater than the protruding length L1 of one claw portion 250a. The width (axial dimension) of each engaged portion 32 is set to, for example, approximately the same as the thickness (axial dimension) of the pair of claw portions 250. However, the present invention is not limited to this example, and the protruding length L1 of one claw portion 250a and the protruding length L2 of the other claw portion 250b may be the same dimension, for example.

[0039] As shown in Figures 6(a) and 6(b), the first surface 251a, which is the surface of the base 252 facing the axial center of the shaft 10, and the second surface 251b, which is the surface of the tip 254 facing the connector body 220, are perpendicular to each other and intersect in a broken line. According to this configuration, a right-angled corner 251c is formed by the first surface 251a and the second surface 251b in the claw portion 250. When a portion of the connector 210 on the center of the axis AX of the shaft 10 is pulled in the axial direction of the shaft 10, the corner 251c between the first surface 251a and the second surface 251b can be securely locked to the engaged portion 32 (more specifically, the disengagement prevention portion 34). Therefore, disengagement of the connector 210 from the body surface contact portion 20 is securely prevented. More specifically, the radius of curvature of corner 251c between first surface 251a and second surface 251b is smaller than the radius of curvature of lower end 254a of tip portion 254. In addition, the radius of curvature of corner 251c between first surface 251a and second surface 251b is smaller than the radius of curvature of lower end 254b of the boundary between base portion 252 and tip portion 254. Furthermore, the radius of curvature of the lower end 254a of the tip 254 of one claw portion 250a is smaller than the radius of curvature of the lower end 254a of the tip 254 of the other claw portion 250b.

[0040] As described above, when the portion 211 of the connector 210 on the axial center AX of the shaft 10 is pulled in the axial direction of the shaft 10 (e.g., upward), removal of the connector 210 from the body surface contact portion 20 is effectively restricted. More specifically, as shown in FIG. 7( a), when the portion 211 of the connector 210 on the axial center AX of the shaft 10 is pulled upward, the upper end surface of each of the tip portions 254 of the pair of claw portions 250 abuts against the lower surface of the corresponding removal prevention portion 34. Furthermore, the connectable member 30 of the body surface contact portion 20 is clamped between the corner portions 251 c of the pair of claw portions 250. This prevents the claw portions 250 from removing upward from the corresponding engaged portion 32. Therefore, removal of the connector 210 from the body surface contact portion 20 is restricted. On the other hand, as described above, when a portion 212 of the connector 210 offset from the axial center AX of the shaft 10 (for example, the protruding portion 231 on the tube main body 260 side of the pair of protruding portions 231) is pulled in a direction obtained by combining the offset direction (for example, the direction of arrow C shown in FIG. 7(a)) and the axial direction of the shaft 10 (for example, the direction of arrow B), the connector 210 disengages from the body surface abutment portion 20. More specifically, when the portion 212 of the connector 210 offset from the axial center AX of the shaft 10 is pulled in a direction obtained by combining the offset direction and the axial direction of the shaft 10 (for example, diagonally upward on the offset side (the direction of arrow B shown in FIG. 7(a))), one of the claw portions 250a (on the tube main body 260 side) first disengages from the corresponding engaged portion 32 (see FIG. 7(b)). More specifically, when the offset portion 212 is pulled in a direction obtained by combining the offset direction and the axial direction of the shaft 10, the check valve 40 is compressed and deformed in the radial direction between the outer circumferential surface of the tubular portion 240 and the inner circumferential surface of the shaft, allowing the tubular portion 240 to move relatively in the offset direction with respect to the axial center AX of the shaft 10. As a result, one of the claw portions 250a also moves relatively in the offset direction with respect to the axial center AX of the shaft 10, and the one of the claw portions 250a disengages from the corresponding engaged portion 32 to the side (to the radially outer side of the tubular portion 240). Therefore, as shown in FIG. 7(b), the offset portion 212 is lifted upward from the body surface abutment portion 20, and the connector 210 assumes a posture in which it is tilted upward with the other claw portion 250b as the swing axis in a direction obtained by combining the offset direction and the axial direction of the shaft 10. Then, when the inclination angle of the connector 210 with respect to the body surface abutment portion 20 increases, the other claw portion 250b also comes off laterally (toward the radial outside of the tubular portion 240) from the corresponding engaged portion 32. This causes the connector 210 to detach from the body surface abutment portion 20. In this way, the connector 210 is detached from the body surface contact portion 20, so that the gastrostomy catheter 100 is prevented from being pulled by the tube 200 and being unintentionally removed from the fistula 430. Furthermore, when one of the claw portions 250a disengages from the corresponding engaged portion 32, in addition to the check valve 40, the tubular portion 240 may also elastically deform, the engaged portion 32 (connected member 30) may also elastically deform, the claw portion 250a side may also elastically deform, or the tubular portion 240, the engaged portion 32 (connected member 30) and the claw portion 250 may each elastically deform. As described above, the protruding length L1 of the claw portion 250a is smaller than the protruding length L2 of the other claw portion 250b. That is, the portion of the claw portion 250a inserted into the engaged portion 32 is smaller than the portion of the claw portion 250b inserted into the engaged portion 32. Therefore, when one claw portion 250a moves in the offset direction relative to the axial center AX of the shaft 10, even if the amount of movement of the one claw portion 250a in the offset direction is small, the tip portion 254 of the claw portion 250a can easily come off the engaged portion 32.

[0041] Furthermore, as described above, in this embodiment, the tube body 260 of the tube 200 has an extension portion 270 (FIGS. 8(a) and 8(b)) that can be extended when pulled. Note that in FIGS. 8(a) and 8(b), the tube body 260 is illustrated in cross section along its axial direction. With this configuration, even if the tube main body 260 is pulled in a direction away from the connector 210, the extension section 270 can extend and absorb the pulling force that occurs at that time. Therefore, it is possible to more reliably prevent the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430. More specifically, as described above, the tube body 260 extends in a direction perpendicular to the axis of the shaft 10. When the tube body 260 is pulled in the extending direction, the extension section 270 extends in the axial direction and can absorb the pulling force that occurs at that time. This prevents the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430. Furthermore, as described above, in this embodiment, when the portion 212 of the connector 210 that is offset from the axial center AX of the shaft 10 is pulled in a direction that is a combination of the offset direction and the axial direction of the shaft 10, the claw portion 250 disengages from the engaged portion 32, thereby preventing the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430. Thus, according to this embodiment, when the connector 210 and therefore the tube 200 are pulled in a direction other than the axial direction of the shaft 10, the gastrostomy catheter 100 can be more reliably prevented from being pulled by the tube 200 and being unintentionally removed from the fistula 430. In this embodiment, the extension portion 270 is provided in a portion (a partial section) in the axial direction. More specifically, the extension portion 270 is provided locally on the tip side (connector 210 side) of the tube main body 260, for example. However, the present invention is not limited to this example, and the extensions 270 may be provided at multiple locations (multiple sections) in the axial direction, or may be provided over the entire tube body 260.

[0042] 1, 8(a) and 8(b), in this embodiment, the extension section 270 is formed to be thinner than the other sections of the tube body 260. This allows the extension section 270 to be more easily extendable in the axial direction than the other sections of the tube body 260. More specifically, in the tube main body 260, a portion (a partial section) in the axial direction that constitutes the extension section 270 is formed to be thinner than the other portions (other sections) in the axial direction. The outer diameter of the tube body 260 is constant regardless of the position in the axial direction, whereas the inner diameter of the tube body 260 is smaller at the extension portion 270 than at other portions of the tube body 260. In the present embodiment, for example, the thickness of the extension portion 270 is preferably 10% to 80% and more preferably 15% to 50% of the thickness of the remaining portions of the tube body 260. With this configuration, the extension portion 270 can be made to extend satisfactorily in its axial direction, and the structural strength of the tube body 260 can be adequately ensured. Moreover, the length dimension of extension portion 270 (the dimension in the axial direction of tube main body 260) is, for example, preferably 1 / 10 to 2 / 1 (twice) the length dimension of the other portion of tube main body 260, and more preferably 1 / 5 to 1 / 2 the length dimension of the other portion of tube main body 260. With this configuration, extension portion 270 can effectively absorb the tensile force when tube 200 is pulled in a direction other than the axial direction of shaft 10.

[0043] 9(a) and 9(b), the extension section 270 may be formed of a material that is more easily stretchable than the other sections of the tube body 260. Even with this configuration, the extension section 270 can be more easily stretched in the axial direction than the other sections of the tube body 260. More specifically, the material of the extension portion 270 is not particularly limited, but may be, for example, polyurethane resin, polyvinyl chloride resin, silicone rubber, or other rubber materials. On the other hand, the material of the other parts of the tube body 260 is not particularly limited, but examples thereof include polyvinylidene fluoride resin, polytetrafluoroethylene resin, polyethylene resin, polypropylene resin, silicone rubber, or other rubber materials. In such a configuration, the length dimension of the extension portion 270 (the dimension in the axial direction of the tube main body 260) is, for example, preferably 1 / 10 to 2 / 1 (twice) the length dimension of the other portion of the tube main body 260, and more preferably 1 / 5 to 1 / 2 of the length dimension of the other portion of the tube main body 260.

[0044] In the present invention, the tube body 260 may have, for example, a two-layer structure. In this case, the section of the tube body 260 that constitutes the extension section 270 may be configured as a single layer, and the section that constitutes the other part of the tube body 260 may be configured as a two-layer structure. This allows the extension section 270 to be thinner than the other parts of the tube body 260. Furthermore, in the tube body 260, one layer of the section that constitutes the extension section 270 may be formed from a material that is more easily stretchable than the other layer. This allows the extension section 270 to be configured from a material that is more easily stretchable than the other parts of the tube body 260.

[0045] Second Embodiment Next, a second embodiment will be described with reference to FIGS. 10(a) and 10(b). The gastrostomy catheter kit 300 according to this embodiment differs from the gastrostomy catheter kit 300 according to the first embodiment in the points described below, but is otherwise configured similarly to the gastrostomy catheter kit 300 according to the first embodiment.

[0046] As shown in Figures 10(a) and 10(b), in this embodiment, at least a portion of the tube main body 260 is looped in a circular shape, and a connecting portion 280 is provided to connect both ends of the loop portion 265. When the tube body 260 is pulled, the connection by the connecting portion 280 is released and the tube body 260 extends. With this configuration, even if the tube 200 is pulled in its extension direction, the tube body 260 is extended and the connection by the connecting portion 280 is released, thereby absorbing the pulling force. Therefore, it is possible to more reliably prevent the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430.

[0047] More specifically, as shown in FIG. 10(a), the loop portion 265 and the connecting portion 280 are provided, for example, on the tip side of the tube main body 260 (on the connector 210 side). The loop portion 265 is formed, for example, in a ring shape in a plan view, and is arranged so as to be convex in a direction intersecting the direction in which the tube main body 260 extends from the connector 210. In the tube main body 260, the length dimension (dimension in the axial direction of the tube main body 260) of the portion constituting the loop portion 265 is, as an example, preferably 1 / 10 or more and 2 / 1 or less (twice) of the length dimension of the other portion of the tube main body 260, and more preferably 1 / 5 or more and 1 / 2 or less of the length dimension of the other portion of the tube main body 260. Note that Figure 10(a) illustrates an example in which one location on the tube body 260 is looped in a circular shape and one loop portion 265 is provided, but the present invention is not limited to this example, and multiple locations on the tube body 260 may be looped in a circular shape and multiple loop portions 265 may be provided.

[0048] In the case of this embodiment, as an example, the connecting portion 280 is a pair of magnets, which detachably connect parts of the tube main body 260 together to form the loop portion 265 . As shown in FIGS. 10(a) and 10(b), when the tube 200 is pulled in its extension direction (for example, in the direction of arrow C (horizontal direction) shown in FIG. 10(a)), the connection of the connecting portion 280 (the attraction between the magnets) is released. As a result, as shown in FIG. 10(b), the portion of the tube main body 260 that constituted the loop portion 265 can be stretched linearly from its annular looped state. Therefore, the tube 200 stretches in its axial direction, and the gastrostomy catheter 100 is prevented from being pulled by the tube 200 and being unintentionally removed from the fistula 430. In this embodiment, since the connecting portion 280 is a pair of magnets, even after the connection by the connecting portion 280 is released, the magnets can be attracted to each other to loop the tube main body 260 into a ring shape, and the loop portion 265 can be established again. In the present invention, the connecting portion 280 is not limited to a pair of magnets, but may also be a pair of hook portions configured to be able to engage with each other, a sealing material configured to be easily peelable, or a tape material that can be easily torn.

[0049] Third Embodiment Next, a third embodiment will be described with reference to FIGS. 11(a) and 11(b). The gastrostomy catheter kit 300 according to this embodiment differs from the gastrostomy catheter kits 300 according to the first and second embodiments in the points described below, but is otherwise configured similarly to the gastrostomy catheter kits 300 according to the first and second embodiments.

[0050] As shown in FIGS. 11(a) and 11(b), in this embodiment, at least a portion of the tube main body 260 is formed in the shape of an expandable curled cord to form an extension portion 270. With this configuration, even if the tube 200 is pulled in its extension direction, the pulling force can be absorbed by the extension of the extension section 270. Therefore, it is possible to more reliably prevent the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430.

[0051] More specifically, for example, as shown in Figures 11(a) and 11(b), when the tube 200 is pulled in its extension direction (for example, in the direction of arrow C (horizontal direction) shown in Figure 11(a)), the extension section 270 extends particularly well in its axial direction, preventing the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430.

[0052] As shown in FIG. 11(a), the extension portion 270 (curl cord-like portion) is, for example, wound multiple times in a circular shape when viewed in a plane, and is arranged so as to be convex in a direction intersecting the extension direction of the tube main body 260 from the connector 210. Although Figure 11(a) illustrates an example in which a portion of the tube body 260 is formed in a curled cord shape, the present invention is not limited to this example, and multiple portions of the tube body 260 may be formed in a curled cord shape, or the entire tube body 260 may be formed in a curled cord shape.

[0053] [Fourth embodiment] Next, a fourth embodiment will be described with reference to FIGS. 12(a), 12(b), and 12(c). The gastrostomy catheter kit 300 according to this embodiment differs from the gastrostomy catheter kits 300 according to the first to third embodiments in the points described below, but is otherwise configured similarly to the gastrostomy catheter kits 300 according to the first to third embodiments.

[0054] In this embodiment, the tube main body 260 has a first extension portion 272 and a second extension portion 274 as the extension portion 270, and the first extension portion 272 and the second extension portion 274 differ from each other in, for example, the tensile force required to extend by a unit length. In other words, the first extension portion 272 and the second extension portion 274 differ from each other in their ease of extension. Note that the "tensile force required to extend by a unit length" here refers to the spring constant of the curled cord or bellows when the extension portion 270 is formed in a curled cord or bellows shape, and refers to the strength of the magnetic attraction when the extension portion 270 is formed in a curled cord or bellows shape. With this configuration, the pulling force when the tube 200 is pulled can be absorbed in two stages, which more reliably prevents the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430.

[0055] More specifically, as shown in Figures 12(a), 12(b) and 12(c), in this embodiment, the tube main body 260 has, as the extension portion 270, a first extension portion 272 and a second extension portion 274 that begins to extend after the first extension portion 272 begins to extend. More specifically, as an example, the first extension portion 272 is a portion formed in a curled cord shape like the extension portion 270 in the third embodiment. Also, as an example, the second extension portion 274 is the loop portion 265 in the second embodiment, and extends in its axial direction when the connection by the connecting portion 280 is released. In the case of the present embodiment, as an example, the first extension portion 272 is arranged closer to the tip end (connector 210 side) than the second extension portion 274. 12(a), 12(b), and 12(c), for example, when the tube 200 is pulled in its extension direction (for example, the direction of arrow C (horizontal direction) shown in FIG. 12(a)), the first extension portion 272 begins to extend first. Subsequently, when the tube 200 is pulled further, the connection by the connecting portion 280 in the second extension portion 274 is released, and the second extension portion 274 extends in its axial direction. According to this configuration, when the pulling force on tube 200 is less than a certain level, first extension portion 272, which is in the form of a curled cord, stretches first and can absorb the pulling force before second extension portion 274, which is loop portion 265, is released from connection. This eliminates the need to reconnect stretched second extension portion 274 into a loop shape. On the other hand, when the force pulling the tube 200 is equal to or greater than a certain level, the pulling force can be absorbed not only by the first extension portion 272 but also by the second extension portion 274. In this way, in the case of this embodiment, the pulling force when the tube 200 is pulled can be absorbed in two stages, which more reliably prevents the gastrostomy catheter 100 from being pulled by the tube 200 and being unintentionally removed from the fistula 430.

[0056] However, the present invention is not limited to this example, and the first extension portion 272 may be configured to be thinner than other portions of the tube body 260, as in the first embodiment, or may be configured to be made of a material that is easier to extend than other portions of the tube body 260. Furthermore, the first extension portion 272 and the second extension portion 274 may each be formed in a bellows shape, and the magnitude of the force required for the bellows to begin to extend (the stiffness of the bellows) may be different between the first extension portion 272 and the second extension portion 274. Furthermore, the timing at which the first extending portion 272 and the second extending portion 274 start to extend may be the same.

[0057] The present invention is not limited to the above-described embodiments, but includes various modifications and improvements as long as the object of the present invention is achieved.

[0058] The present embodiment encompasses the following technical ideas. (1) A gastrostomy catheter kit comprising a gastrostomy catheter and a connection tube detachably connected to the gastrostomy catheter, The gastrostomy catheter has a shaft having a lumen formed therein and a body surface abutment portion provided at one end of the shaft, the connection tube has a long tube body and a connector provided at one end of the tube body and detachably attached to the body surface contact portion, A gastrostomy catheter kit in which the tube body has an extension portion that can be extended when pulled. (2) The gastrostomy catheter kit according to (1), wherein the extension portion is formed to be thinner than the other portions of the tube body. (3) The gastrostomy catheter kit according to (1), wherein the extension portion is formed of a material that is more easily extendable than other portions of the tube body. (4) At least a portion of the tube body is looped in an annular shape, and a connecting portion is provided to connect both ends of the loop portion, The gastrostomy catheter kit according to (1), wherein when the tube body is pulled, the connection by the connecting portion is released and the tube body extends. (5) The gastrostomy catheter kit according to (1), wherein at least a portion of the tube body is formed in the shape of an expandable curled cord to form the extension portion. (6) The gastrostomy catheter kit according to any one of (1) to (5), wherein the tube body has, as the extension portion, a first extension portion and a second extension portion that begins to extend after the first extension portion begins to extend. (7) The tube body has a first extension portion and a second extension portion as the extension portion, The gastrostomy catheter kit according to any one of (1) to (5), wherein the first extension section and the second extension section require different pulling forces for extension per unit length. (8) A connection tube used by being detachably connected to a body surface contact portion of a gastrostomy catheter having a shaft with a lumen formed therein and a body surface contact portion provided at one end of the shaft, A long tube body, a connector provided at one end of the tube body and detachably attached to the body surface contact portion; and The tube body has an extension portion that can be extended when pulled. [Explanation of symbols]

[0059] 10 shaft 11 lumens 12 Inlet hole 20 Body surface contact part 30 Connected members 30a Inner flange 30b Main body 31 Aperture 32 Pair of engaged parts 32a opening 32b One end 32c Other end 32d outer surface 33 Locking protrusion 34 Fall-off prevention part 40 Check valve 50 Bumper 82 Plug member 100 Gastrostomy catheter 200 tubes 210 Connector 211 The part of the connector located on the axial center of the shaft 212 A portion of a connector offset from the axial center of the shaft 220 Connector body 221 Communication hole 223 Engagement hole 231 Overhang 240 Tubular part 250 Claw 250a One of the claws 250b Other claw 251a 1st page 251b 2nd page 251c Corner 252 Base 254 Tip 254a Lower end 254b Boundary 260 Tube body 265 Loop section 270 Extension part 272 1st extension part 274 2nd extension part 280 Connection section 300 Gastrostomy Catheter Kit 410 Abdominal wall 430 Fistula

Claims

1. A gastrostomy catheter kit comprising a gastrostomy catheter and a connection tube detachably connected to the gastrostomy catheter, The gastrostomy catheter has a shaft having a lumen formed therein and a body surface abutment portion provided at one end of the shaft, the connection tube has a long tube body and a connector provided at one end of the tube body and detachably attached to the body surface contact portion, A gastrostomy catheter kit in which the tube body has an extension portion that can be extended when pulled.

2. The gastrostomy catheter kit according to claim 1 , wherein the extension portion is formed to be thinner than the other portions of the tube body.

3. The gastrostomy catheter kit according to claim 1 , wherein the extension portion is formed of a material that is more easily extendable than other portions of the tube body.

4. At least a portion of the tube body is looped in an annular shape, and a connecting portion is provided to connect both ends of the loop portion, The gastrostomy catheter kit according to claim 1, wherein when the tube body is pulled, the connection by the connecting portion is released and the tube body extends.

5. 2. The gastrostomy catheter kit according to claim 1, wherein at least a portion of the tube body is formed into an expandable curl cord shape to form the extension portion.

6. 6. The gastrostomy catheter kit according to claim 1, wherein the tube body has, as the extension portion, a first extension portion and a second extension portion that begins to extend after the first extension portion begins to extend.

7. The tube body has a first extension portion and a second extension portion as the extension portion, The gastrostomy catheter kit according to any one of claims 1 to 5, wherein the first extension section and the second extension section have different pulling forces required for extension per unit length.

8. A gastrostomy catheter has a shaft having a lumen and a body surface abutment portion provided at one end of the shaft. A connection tube is used by being detachably connected to the body surface abutment portion, A long tube body and a connector provided at one end of the tube body and detachably attached to the body surface contact portion; and The tube body has an extension portion that can be extended when pulled.

Images