JP2014217703A - Insertion auxiliary tool for indwelling catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insertion auxiliary tool for an indwelling catheter that is suitable for an indwelling catheter having a slip-off stopping member, the end of which is fixed thereto.SOLUTION: An insertion auxiliary tool for a gastrostomy tube 11 serving as an insertion auxiliary tool for an indwelling catheter includes: an auxiliary tool body 12 including a guide part 14 and a finger hooking part 15; and a cover member 13 for covering the guide part 14. The guide part 14 is provided with an open part 20, and the cover member 13 is provided with a part 22 to be cut off along the open part 20. When the auxiliary tool body 12 is removed, the interference of the guide part and the cover member with a gastrostomy tube 1 is avoided by the open part 20 and the part 22 to be cut off which is cut out from the cover member.

Description

  The present invention relates to an indwelling catheter insertion aid for inserting an indwelling catheter having a retaining member having flexibility into a fistula.

  Conventionally, at the distal end portion of the gastrostomy tube placed in the fistula passing through the abdominal wall and the gastric wall which are in close contact with each other, a retaining member which expands in the stomach is provided to prevent the gastrostomy tube from coming off. When exchanging such a gastrostomy tube, a gastrostomy tube insertion aid for assisting the insertion of the gastrostomy tube into the fistula is used in order to reduce insertion resistance of the gastrostomy tube into the fistula.

  As such a gastrostomy tube insertion aid, Patent Document 1 describes a device configured by inserting a sheath insertion aid into a gastrostomy sheath. This gastrostomy tube insertion assisting tool is guided by a guide wire and inserted into the fistula after the old gastrostomy tube is removed from the fistula. Then, the sheath insertion aid is removed from the gastrostomy tube insertion aid, leaving the gastrostomy sheath in the fistula.

  Using the remaining gastrostoma sheath, a new gastrostomy tube is placed in the fistula. That is, a new gastrostomy tube is attached to the obturator for inserting the gastrostomy tube. The obturator extends the retaining member at the distal end of the gastrostomy tube, and the gastrostomy tube is inserted into the gastrostomy sheath from the distal end side. At this time, since the sheath for gastrostoma is torn by the retaining member, it can be removed from the fistula.

  When the distal end of the gastrostomy tube reaches the stomach, the gastrostomy sheath is removed, and the extension of the retaining member is released. As a result, the retaining member prevents the gastrostomy tube from coming out of the fistula. Thereafter, the obturator is removed from the gastrostomy tube, and the gastrostomy tube is closed with a cap, whereby the placement of the gastrostomy tube is completed.

  On the other hand, as a gastrostomy tube, a tube having a retaining member different from that described in Patent Document 1 is also known (see, for example, Patent Document 2). This gastrostomy tube retaining member is made up of a fixed portion fixed to the distal end portion of the tube main body, a sliding portion slidably provided on the tube main body, and a fixed portion and a sliding portion. And a bending member to be connected. That is, the rear end portion of the retaining member is slidable by the sliding portion, and the distal end portion is fixed to the distal end portion of the tube main body.

  When the gastrostomy tube having such a tip-fixed retaining member is inserted into the fistula, the bending member is contracted in the radial direction, so that the sliding portion slides in the rear end direction of the tube main body and is bent. The member is inserted into the fistula in a state where the member extends linearly and the radial dimension is reduced. In addition, since the sliding portion moves according to the thickness of the abdominal wall or stomach wall, it is possible to easily cope with fluctuations in the length of the fistula. Further, unlike the gastrostomy tube described in Patent Document 1, the retaining member does not extend forward when inserted into the fistula, and the length is constant, so that handling is easy.

JP 2009-148554 A JP 2008-178473 A

  In the gastrostomy tube insertion aid of Patent Document 1, the gastrostomy tube is inserted into the gastrostomy sheath placed in the fistula with the retaining member extended by the obturator when placed in the fistula. On the other hand, the gastrostomy tube having the tip-fixed retaining member of Patent Document 2 is not in a state where the retaining member is extended forward by the obturator when placed in the fistula.

  For this reason, the gastrostomy tube insertion assisting tool of Patent Document 1 cannot be applied to a gastrostomy tube provided with the distal end fixing type retaining member described in Patent Document 2 having the above-described advantages.

  An object of the present invention is to provide an indwelling catheter insertion assisting tool suitable for an indwelling catheter such as a gastrostomy tube having a tip-fixing type retaining member in view of the problems of the prior art.

  The indwelling catheter insertion aid of the present invention is an indwelling catheter insertion aid for inserting an indwelling catheter having a flexible retaining member into a fistula, the outer tube having flexibility, and the outer tube An inner cylinder arranged in the outer cylinder, and the inner cylinder has two cylindrical parts inserted into the fistula and two diagonal lines on the rear end edge of the cylindrical part. A pair of finger-hanging portions projecting rearward and outward at a location, and the cylindrical portion has a slit communicating between the pair of finger-hanging portions from the rear end to the tip end of the cylindrical portion, A cover portion covering the cylindrical portion of the inner cylinder, a cut-out portion provided from the rear end to the tip of the cover portion, and a tab portion provided at the rear end of the cut-out portion and protruding outward. The outer cylinder is to be cut along the slit of the inner cylinder It is characterized in.

  In the present invention, when the indwelling catheter is inserted into the fistula, first, the cylindrical portion of the inner cylinder disposed in the outer cylinder is inserted into the fistula. Thereafter, the indwelling catheter is inserted from the distal end side into the tubular portion from the rear end side. At the time of this insertion, the operator's finger is hung on the finger-holding portion of the inner cylinder, and the inner cylinder is maintained at a fixed position with respect to the fistula so that unnecessary force is not applied to the fistula.

  Therefore, at this time, the indwelling catheter includes a fixing portion fixed to the distal end portion of the catheter, a sliding portion that can slide on the catheter, and a flexible bending member that connects the fixing portion and the sliding portion. Even if the retaining member is inserted into the cylindrical portion of the inner cylinder in an expanded state, the retaining member does not burden the fistula. Without being put on, it is effectively shrunk and guided by the cylindrical part and reaches the inside of the fistula without any trouble.

  Then, the tab part of an outer cylinder is pinched | interposed with an operator's finger with an indwelling catheter, and is fixed to an indwelling catheter. In this state, the operator's finger is hung on the finger rest portion of the inner cylinder, and the inner cylinder is pulled out. This extraction is performed without interfering with the inner cylinder so that the indwelling catheter passes through the slit of the inner cylinder.

  At this time, as the inner cylinder is pulled out, the outer cylinder is also pulled out along with the inner cylinder. Thereby, the scheduled cut-out part of the cover part of the outer cylinder along the slit of the inner cylinder is sequentially separated from the other part of the cover part from the tab side fixed to the indwelling catheter. For this reason, an outer cylinder is also extracted from a fistula, without interfering with an indwelling catheter.

  Therefore, according to the present invention, it is possible to provide an indwelling catheter insertion assisting tool suitable for inserting an indwelling catheter having a fixed tip type retaining member into a fistula. In addition, the indwelling catheter insertion aid can be easily removed after the indwelling catheter is inserted.

  In the present invention, the rear end side of the cylindrical portion may gradually increase in diameter toward the rear end. According to this, the indwelling catheter can be easily inserted into the cylindrical portion, and the retaining member of the indwelling catheter can be more effectively contracted during the insertion.

  In the present invention, the cylindrical portion may be provided with a slit-shaped cut portion that facilitates a change in diameter at a position facing the slit.

  According to this, since the diameter of the cylindrical portion easily changes due to the pressure applied in accordance with the insertion of the cylindrical portion into the fistula or the insertion of the indwelling catheter into the cylindrical portion, the cylindrical portion into the fistula The insertion or insertion of the indwelling catheter into the cylindrical portion can be performed smoothly.

It is a perspective view which shows the gastrostomy tube insertion auxiliary tool which concerns on one Embodiment of this invention, (a) shows the whole gastrostomy tube insertion auxiliary tool, (b) is the assistance of a gastrostomy tube insertion auxiliary tool. The instrument main body is shown, (c) shows the cover member of a gastrostomy tube insertion auxiliary tool. It is a perspective view of the gastrostomy tube to which the gastrostomy tube insertion auxiliary tool of FIG. 1 is applied. (A)-(f) is a schematic diagram which shows the procedure which replaces | exchanges the gastrostomy tube of FIG. 2 using the gastrostomy tube insertion auxiliary tool of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The gastrostomy tube insertion aid of the embodiment is used to assist in inserting a new gastrostomy tube into the fistula when the gastrostomy tube placed in the fistula that penetrates the abdominal wall and the stomach wall that are in close contact with each other is replaced. It is done. In the present specification, “tip” for an element means an end on the side of the element in the insertion direction into the fistula, and “rear end” means an end on the opposite side.

  FIG. 2 is a perspective view of a gastrostomy tube to which the gastrostomy tube insertion aid of the present embodiment is applied. The gastrostomy tube 1 is used for administration of nutrients and the like into the stomach. As the material of the gastrostomy tube 1, for example, silicone rubber is used.

  As shown in FIG. 2, the gastrostomy tube 1 includes a tube body 2 through which nutrients and the like supplied into the stomach circulate, a bumper 3 provided at the distal end of the tube body 2, and a rear end of the tube body 2 A feeding port 4 provided in the body part, a body surface fixing part 5 provided around the feeding port 4, and a cap part 6 connected to the body surface fixing part 5.

  The tube main body 2 has flexibility and resilience by elasticity so that the vicinity of the feeding port 4 can be easily bent and returned.

  The bumper 3 is fixed to a fixed portion 7 fixed to the distal end side end portion of the tube main body 2, a sliding portion 8 slidable on the tube main body 2 by an inner peripheral surface facing the outer peripheral surface of the tube main body 2, A bending portion 9 that connects the portion 7 and the sliding portion 8 is provided.

  As a material constituting the bumper 3, for example, silicone rubber is used so that the bumper 3 has flexibility and resilience due to elasticity. Thereby, the bumper 3 is contracted toward the outer peripheral surface of the tube body 2 so that the insertion is easily performed when the gastrostomy tube 1 is inserted into the fistula, and is expanded in the stomach after the insertion. Thus, it functions as a retaining member that prevents the gastrostomy tube 1 from slipping out.

  The feeding port 4 has an outer diameter that is slightly larger than the outer diameter of the tube body 2. A tube for supplying nutrients and the like is connected to the feeding port 4.

  The body surface fixing part 5 has a width substantially the same as the diameter of the feeding port 4 and is formed of a plate-like member extending from the feeding port 4 in both directions radially away from each other. The feeding port 4 is located at the center of the plate-like member, and the plate-like member is perpendicular to the central axis of the feeding port 4. A backflow prevention valve 10 is provided inside the feeding port 4.

  The cap portion 6 is used to close the feeding port 4 when the gastrostomy tube 1 placed in the fistula is not used for supplying nutrients into the stomach.

  FIG. 1 is a perspective view showing a gastrostomy tube insertion aid of the present embodiment. As shown in FIG. 1A, the gastrostomy tube insertion assisting tool 11 includes an assisting instrument body 12 as an inner cylinder and a cover member 13 as an outer cylinder, and the cover member 13 is provided outside the assisting instrument body 12. Used in a fitted state. The cover member 13 has flexibility, and the auxiliary tool body 12 is harder than the cover member 13.

  Prior to insertion of the gastrostomy tube 1 into the fistula, the auxiliary tool body 12 is disposed in the fistula together with the cover member 13, assists the insertion, and is removed from the fistula after the insertion is completed. When assisting the insertion, the auxiliary tool body 12 has a function of guiding the distal end portion of the gastrostomy tube 1 into the stomach. The cover member 13 is fitted to the outside of the auxiliary tool body 12 so that the insertion of the auxiliary tool body 12 into the fistula, the auxiliary of the insertion, and the removal of the auxiliary tool main body 12 from the fistula are performed without hindrance. And has a function of covering the outside.

  As shown in FIG. 1B, the auxiliary tool body 12 is fixed to the guide portion 14 as a tubular portion having a funnel shape with a rear end portion having a diameter larger than that of the tip portion, and to the rear end portion of the guide portion 14. And a finger hook 15 used for removing the auxiliary tool body 12.

  The guide part 14 includes a cylindrical part 16 on the front end side that is inserted into the fistula for placement in the fistula of the auxiliary tool body 12, and a truncated cone part 17 on the rear end side that gradually increases in diameter toward the rear end part. With. In order to assist the insertion of the gastrostomy tube 1, the guide unit 14 contracts the bumper 3 of the gastrostomy tube 1 inserted into the guide unit 14 at the truncated cone portion 17, and the intragastric region via the cylindrical portion 16. To guide.

  A flange portion 18 is provided at the rear end edge of the truncated cone portion 17 so as to extend radially outward from the rear end edge. The flange 18 is provided with a finger hook 15 above the left and right sides.

  The finger hook portion 15 is composed of a pair of plate-like members 19a and 19b that are fixed to two diagonal positions on the rear end edge of the truncated cone portion 17 via flange portions 18 and project rearward and outward. The The finger hook 15 is used by an operator to hold the auxiliary tool body 12 by hooking a finger so that the patient is not burdened when inserting the gastrostomy tube 1 into the fistula.

  The plate-like members 19a and 19b rise from the two end edges 18a and 18b of the flange portion 18 in parallel with each other in the opposite direction to the tip of the auxiliary tool body 12, and further bend and extend at right angles in directions away from each other. To do. Thereby, the plate-shaped members 19a and 19b are symmetrical with respect to a plane including the central axis of the auxiliary tool body 12.

  The guide portion 14 is provided with an open portion 20 as a slit that communicates from the front end to the rear end of the guide portion 14. The open part 20 is located on a plane that includes the central axis of the guide part 14 and is perpendicular to the direction in which the plate-like members 19a and 19b of the finger hook part 15 are separated from each other. The opening part 20 has a function of avoiding interference between the gastrostomy tube 1 and the guide part 14 and leaving the gastrostomy tube 1 in the fistula when the auxiliary tool body 12 is removed.

  Further, the guide portion 14 allows the diameter of the cylindrical portion 16 to change in accordance with the insertion of the cylindrical portion 16 into the fistula or the insertion of the bumper 3 of the gastrostomy tube 1 into the cylindrical portion 16. The slit-shaped cut portion 14 a is provided in a range from the front end of the guide portion 14 to the vicinity of the rear end at a position facing the opening portion 20.

  As shown in FIG.1 (c), the cover member 13 is provided with the cover part 13a which covers the guide part 14 of the auxiliary tool main body 12, and the tab part 13b extended in the radial direction outward from the rear end edge. The tab portion 13b is sandwiched between the body surface fixing portion 5 or the feeding port 4 (see FIG. 2) in a state where the tube main body 2 is bent by an operator's finger when the auxiliary tool main body 12 is removed from the fistula. It is fixed to the gastrostomy tube 1.

  The cover portion 13a is provided with a scheduled cutting portion 22 from the rear end to the front end. The tab portion 13b is connected to the rear end of the scheduled cutting portion 22 and protrudes outward. A perforation 23 for facilitating the separation of these parts is provided at the boundary between the cut-out scheduled portion 22 of the cover member 13 and other portions. When the cover member 13 is pulled out along with the auxiliary tool body 12 when the auxiliary tool body 12 is removed, the cut-out scheduled portion 22 is separated from the other parts of the cover member 13 together with the tab portion 13b.

  The cut-out scheduled portion 22 is provided in a portion corresponding to the opening portion 20 of the auxiliary tool body 12. When the gastrostomy tube insertion assisting tool 11 is used, the cover member 13 is fitted to the outside of the assisting instrument main body 12 so that the cut-out scheduled part 22 extends along the opening part 20.

  FIG. 3 shows a procedure for exchanging the gastrostomy tube 1 using the gastrostomy tube insertion assisting tool 11. This procedure proceeds as follows. That is, first, the old gastrostomy tube 1 placed in the fistula 26 that penetrates the abdominal wall 24 and the gastric wall 25 that are in close contact with each other is removed. As a result, as shown in FIG. 3A, the guide wire 27 used for the removal is left.

  In this state, as shown in FIG. 3B, the gastrostomy tube insertion assisting tool 11 with the cover member 13 fitted to the assisting instrument body 12 is inserted into the fistula 26. At this time, the guide wire 27 is inserted into the gastrostomy tube insertion aid 11 from its distal end side. And the cylindrical part 16 (refer FIG.1 (b)) covered with the cover member 13 of the gastrostomy tube insertion auxiliary tool 11 is introduce | transduced into the fistula 26 by guide of the guide wire 27. FIG.

  Next, as shown in FIG. 3 (c), the new gastrostomy tube 1 attached to the tip of the gastrostomy tube insertion assisting tool 11 is inserted into the assisting instrument main body 12 by the obturator 28. At this time, the guide wire 27 is inserted into the gastrostomy tube 1 and obturator 28 from the distal end side. Then, the gastrostomy tube 1 is introduced from the distal end side to the guide portion 14 (see FIG. 1) of the auxiliary instrument main body 12 from the rear end side by the guide wire 27.

  At this time, the operator's finger is hung on the finger hook 15 of the auxiliary tool body 12, and the auxiliary tool body 12 is maintained at a fixed position with respect to the fistula 26 so that unnecessary force is not applied to the fistula 26. The

  Thereby, the bumper 3 of the gastrostomy tube 1 is introduced into the stomach through the truncated cone portion 17 and the cylindrical portion 16 (see FIG. 1) of the guide portion 14. This introduction is performed so that the longitudinal direction of the body surface fixing portion 5 of the gastrostomy tube 1 and the longitudinal direction of the finger hooking portion 15 of the auxiliary tool body 12 are substantially parallel.

  At this time, the bumper 3 is contracted by the frustoconical portion 17 and thus passes through the cylindrical portion 16 without any trouble. As a result, the bumper 3 introduced into the stomach expands due to its elasticity, as shown in FIG. As a result, the bumper 3 enters a state in which the gastrostomy tube 1 is prevented from coming out of the fistula 26.

  Next, as shown in FIG. 3 (d), the portion adjacent to the feeding port 4 in the tube main body 2 of the gastrostomy tube 1 includes the central axis of the tube main body 2 and extends in the longitudinal direction of the body surface fixing portion 5. The feeding port 4 or the body surface fixing portion 5 that is the rear end portion of the gastrostomy tube 1 and the tab portion 13b of the cover member 13 are sandwiched by the operator's fingers. At this time, for example, the operator can attach the thumb of the left hand to the rear end portion side of the gastrostomy tube 1 and the index finger to the tab portion 13b side to sandwich the rear end portion and the tab portion 13b.

  Next, the auxiliary tool main body 12 is pulled out from the fistula 26 by the operation of the operator's finger hooking portion 15 while maintaining the state and position where the rear end portion and the tab portion 13b are sandwiched between the fingers. The operator can perform this extraction by inserting, for example, the index finger and the middle finger of the right hand between the plate-like members 19a and 19b (see FIG. 1B) of the finger hook 15 and the abdominal wall 24, respectively.

  When this extraction is started, the tab portion 13b of the cover member 13 is fixed to the rear end portion of the gastrostomy tube 1 by the operator's finger, and the cover member 13 is a cylinder of the assisting device main body 12. It is in the state closely_contact | adhered to the shape-shaped part 16 and the truncated cone-shaped part 17 (refer FIG.1 (b)).

  For this reason, as the auxiliary tool body 12 is pulled out, the cover member 13 is also pulled out along with the auxiliary tool body 12. In parallel with this, the cut-out scheduled portion 22 is cut off from the other portion of the cover portion 13a along the perforation 23 (see FIG. 1C) from the tab portion 13b side. At this time, the opening part 20 (see FIG. 1 (b)) of the auxiliary instrument body 12 passes through the tube body 2 of the gastrostomy tube 1, and the planned cut-out part 22 corresponding to the opening part 20 is from the rear end side. Since it is separated, there will be no trouble in pulling out.

  When the assisting device main body 12 is completely pulled out, the tab portion 13b is completely separated in a state where the tab portion 13b is sandwiched between the operator's finger and the rear end portion of the gastrostomy tube 1 as shown in FIG. The cut-out scheduled portion 22 is left on the abdominal wall 24.

  Next, the remaining tab portion 13b and the planned cutting portion 22 are removed, the bending of the gastrostomy tube 1 is released, and the guide wire 27 is pulled out. Then, by rotating the gastrostomy tube 1 around its central axis, it is confirmed whether or not the gastrostomy tube 1 has been inserted into the fistula 26, while the body surface fixing portion 5 is attached to the abdominal wall 24. It pushes in to the stomach wall 25 side until it contacts. Thereby, the indwelling of the gastrostomy tube 1 is completed, and the state shown in FIG.

  According to this embodiment, since the funnel-shaped guide portion 14 is provided, the insertion of the gastrostomy tube 1 having the tip-fixed bumper 3 as shown in FIG. 2 into the fistula 26 can be assisted without hindrance. Further, the removal of the gastrostomy tube insertion assisting tool 11 after the insertion of the gastrostomy tube 1 is performed by the opening part 20 of the guide part 14 and the scheduled cutting part 22 of the cover member 13, and the guide part 14, the cover member 13 and the gastrostomy tube 1 can be easily performed while avoiding the interference with 1.

  Further, the finger hooking portion 15 is constituted by plate-like members 19 a and 19 b extending in a direction away from each other toward the radially outer side of the guide portion 14. Moreover, the opening part 20 of the auxiliary tool main body 12 is located on a plane that includes the central axis of the guide part 14 and that is perpendicular to the separating direction of the plate-like members 19a and 19b. For this reason, the assisting device main body 12 can be pulled out by making the opening portion 20 easily correspond to the gastrostomy tube 1.

  Further, when inserting the gastrostomy tube 1 into the fistula 26, the operator can hold the assisting device main body 12 by placing a finger on the finger-hanging portion 15, so that it is possible to prevent a burden on the patient.

  Further, when the assisting device main body 12 is removed, the tube main body 2 is bent together with the rear end portion of the gastrostomy tube 1 in a state that includes the central axis and is bent in a plane perpendicular to the longitudinal direction of the body surface fixing portion 5. The tab portion 13b of the cover member 13 can be fixed to the gastrostomy tube 1 by sandwiching the tab portion 13b of the cover member 13 with an operator's finger. Thereby, the assisting device main body 12 can be pulled out without the operator's finger fixing the tab portion 13b to the gastrostomy tube 1 or the body surface fixing portion 5 getting in the way.

  Further, since the slit-like cut portion 14a is provided in the guide portion 14, according to insertion of the cylindrical portion 16 of the guide portion 14 into the fistula 26 or insertion of the bumper 3 of the gastrostomy tube 1 into the cylindrical portion 16, The diameter of the cylindrical portion 16 of the guide portion 14 is easily changed. For this reason, the insertion of the cylindrical portion 16 into the stoma 26 or the insertion of the bumper 3 into the cylindrical portion 16 can be performed smoothly.

  In addition, this invention is not limited to the said embodiment. For example, in the above embodiment, the gastrostomy tube insertion assisting tool 11 used for insertion of the gastrostomy tube 1 into the fistula 26 has been described, but the present invention is also applicable to insertion of an indwelling catheter placed in another fistula. It can also be implemented as a more general indwelling catheter insertion aid.

  DESCRIPTION OF SYMBOLS 1 ... Gastrostomy tube, 2 ... Tube main body, 3 ... Bumper (detachment prevention member), 5 ... Body surface fixing | fixed part, 11 ... Gastrostomy tube insertion auxiliary tool (indwelling catheter insertion auxiliary tool), 12 ... Auxiliary tool main body (inside Cylinder), 13 ... cover member (outer cylinder), 13a ... cover part (cylindrical part), 13b ... tab part, 14 ... guide part, 14a ... notch part, 15 ... finger hook part (a pair of finger hook parts), 16 ... Cylindrical part, 17 ... frustoconical part, 19a, 19b ... plate-like member (two members), 20 ... open part (slit), 22 ... part to be cut, 24 ... abdominal wall, 25 ... stomach wall, 26 ... fistula.

Claims (3)

An indwelling catheter insertion aid for inserting an indwelling catheter provided with a flexible retaining member into a fistula,
A flexible outer cylinder, and an inner cylinder that is harder than the outer cylinder and disposed in the outer cylinder;
The inner cylinder has a cylindrical part to be inserted into the fistula and a pair of finger-hanging parts protruding rearward and outward at two locations on the diagonal line of the rear end edge of the cylindrical part, The part has a slit that communicates from the rear end to the front end of the cylindrical part between the pair of finger hanging parts,
The outer cylinder includes a cover portion that covers the cylindrical portion of the inner cylinder, a cut-out portion provided from the rear end to the front end of the cover portion, and a rear cut end provided at the rear end of the cut-out portion. With tabs,
The indwelling catheter insertion aid, wherein the cutout portion of the outer cylinder is provided along the slit of the inner cylinder.   The indwelling catheter insertion assisting device according to claim 1, wherein a diameter of the rear end side of the cylindrical portion gradually increases toward the rear end.   The indwelling catheter insertion aid according to claim 1 or 2, wherein the tubular portion is provided with a slit-shaped cut portion that facilitates a change in the diameter thereof at a position facing the slit. .

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