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JP-2026075389-A - Gastrostomy catheter

JP2026075389AJP 2026075389 AJP2026075389 AJP 2026075389AJP-2026075389-A

Abstract

[Problem] To provide a gastrostomy catheter that can more reliably maintain its position in the stomach. [Solution] The gastrostomy catheter 100 has a shaft 10 having a lumen 11, a body surface contact portion 20, and a bumper 50 provided at the lower end of the shaft 10 that expands in the stomach. It also includes a wire 60 for deploying the bumper 50 and a wire lumen 12 communicating with the inside of the bumper 50. The bumper 50 has an expansion portion 55 which is the part that expands, and the wire 60 is arranged from the wire lumen 12 into the inside of the bumper 50. The gastrostomy catheter 100 further includes a retraction restriction structure 70, which restricts the portion of the wire 60 that is arranged inside the bumper 50 from being retracted into the wire lumen 12 when the wire is pulled toward the body surface contact portion 20 while the bumper 50 is expanded. [Selection Diagram] Figure 2

Inventors

  • 有川 清貴
  • 鈴木 稔
  • 岡田 和樹

Assignees

  • ＳＢカワスミ株式会社
  • 住友ベークライト株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (10)

  1. A gastrostomy catheter having a shaft with a lumen, a body surface contact portion provided at the upper end of the shaft, and a bumper provided at the lower end of the shaft that expands within the stomach, The wire for deploying the bumper, A wire lumen is formed inside the tube wall of the shaft and communicates with the inside of the bumper, Equipped with, The bumper has an expandable portion, which is an expanding part, and the expandable portion is not fixed to the outer surface of the shaft. The wire is routed from the wire lumen into the interior of the bumper. The gastrostomy catheter in question is, The extension further comprises a retraction restricting structure located in the internal space of the extension, The aforementioned retraction restriction structure restricts the portion of the wire located inside the bumper from being retracted into the wire lumen when the wire is pulled toward the body surface contact portion while the bumper is expanded.
  2. In the state in which the bumper is extended, The portion of the wire disposed inside the bumper includes a first portion extending in the axial direction of the shaft, a second portion wound around the circumferential direction of the shaft, and a third portion extending in a direction including the radial component of the shaft and connecting the first portion and the second portion to each other. The retraction restriction structure is located above the third portion and has a contact portion that contacts the boundary between the first portion and the third portion when the wire is pulled toward the body surface contact portion.
  3. In the state in which the bumper is extended, The gastrostomy catheter according to claim 2, wherein the contact portion is located near the boundary portion.
  4. The aforementioned retraction restriction structure is a cylindrical member that is externally attached to the lower end of the shaft, The cylindrical member has an insertion passage that connects the wire lumen and the inside of the bumper to each other. The gastrostomy catheter according to claim 2 or 3, wherein the wire is introduced into the bumper from the wire lumen through the insertion passage, and at least a portion of the first portion is inserted through the insertion passage.
  5. The gastrostomy catheter according to claim 4, wherein the tubular member has higher rigidity than the shaft.
  6. The aforementioned retraction restriction structure has a thin-walled portion and a thick-walled portion that is thicker than the thin-walled portion at one or more locations in the circumferential direction, The outer circumferential surface of the thickened portion is located radially inward from the outer circumferential surface of the lower end of the shaft, or is arranged flush with the outer circumferential surface of the lower end. The insertion passage is formed in the thickened portion, The gastrostomy catheter according to claim 4, wherein the lower end of the thickened portion constitutes the contact portion.
  7. The shaft has a pair of grooves or a pair of through holes formed at positions 180 degrees opposite to the central axis of the shaft in the circumferential direction, The gastrostomy catheter according to claim 4, wherein either one of the pair of grooves constitutes the insertion passage, or either one of the pair of through holes constitutes the insertion passage.
  8. A recessed groove extending radially outward is formed on the inner circumferential surface of the cylindrical member, from the upper end to the lower end of the cylindrical member. The gastrostomy catheter according to claim 4, wherein the groove constitutes the insertion passage.
  9. The lower end of the shaft includes a first small-diameter portion connected to the intermediate portion of the shaft and having a smaller diameter than the intermediate portion, and a second small-diameter portion connected to the first small-diameter portion and having a smaller diameter than the first small-diameter portion. The inner circumferential surface of the cylindrical member is joined directly or indirectly to the outer circumferential surface of the second small diameter portion. The gastrostomy catheter according to claim 4, wherein the upper end surface of the cylindrical member is directly or indirectly joined to a stepped surface formed by the difference between the outer diameter of the first small diameter portion and the outer diameter of the second small diameter portion.
  10. The lower end of the shaft includes a first small-diameter portion connected to the intermediate portion of the shaft and having a smaller diameter than the intermediate portion, and a second small-diameter portion connected to the first small-diameter portion and having a smaller diameter than the first small-diameter portion. The bumper comprises an outer bumper provided along the outer circumferential surface of the first small diameter portion and an inner bumper provided along the outer circumferential surface of the second small diameter portion. The inner bumper is formed in a cylindrical shape and includes a mounting portion that is externally mounted on the second small diameter portion. The gastrostomy catheter according to claim 4, wherein the attachment portion is the tubular member.

Description

This invention relates to a gastrostomy catheter. An example of a gastrostomy catheter is the one described in Patent Document 1. The gastrostomy catheter of Patent Document 1 comprises a shaft with a lumen, a bumper provided at the lower end of the shaft that expands within the stomach, and a body surface contact portion provided at the upper end of the shaft. The bumper has an expansion portion, which is the part that expands, and this expansion portion is not fixed to the outer surface of the shaft. The wire is arranged from the wire lumen into the interior of the bumper. Japanese Patent Publication No. 2019-98146 This is a perspective view of a gastrostomy catheter according to the first embodiment, showing the bumper in an expanded state.This is a longitudinal cross-sectional view of a gastrostomy catheter according to the first embodiment.Figure 3(a) is a longitudinal cross-sectional view of the bumper and its surrounding structure in the first embodiment, and Figure 3(b) is a partial enlarged view of part A shown in Figure 3(a).This is a cross-sectional view along the line A-A shown in Figure 2.Figure 5(a) is a perspective view of the cylindrical member in the first embodiment, and Figure 5(b) is a plan view of the cylindrical member.This is a longitudinal cross-sectional view of a gastrostomy catheter according to the first embodiment, showing it in a state where it is placed inside the stomach.Figures 7(a) and 7(b) are schematic diagrams showing a bent gastrostomy catheter according to the first embodiment. Figure 7(a) is a longitudinal cross-sectional view of the gastrostomy catheter, and Figure 7(b) is a longitudinal cross-sectional view of the retraction restriction structure and its surrounding structure.This is a longitudinal cross-sectional view of the bumper and its surrounding structure in the first embodiment, showing the state in which the gastrostomy catheter is pulled in a direction that includes a horizontal component.This is a longitudinal cross-sectional view of a gastrostomy catheter according to the second embodiment.Figure 10(a) is a longitudinal cross-sectional view of the bumper and its surrounding structure in the second embodiment, and Figure 10(b) is a partial enlarged view of part A shown in Figure 10(a).This is a longitudinal cross-sectional view of a gastrostomy catheter according to the third embodiment.Figure 12(a) is a longitudinal cross-sectional view of the bumper and its surrounding structure in the third embodiment, and Figure 12(b) is a partial enlarged view of part A shown in Figure 12(a).Figure 13(a) is a perspective view of the inner bumper in the third embodiment, and Figure 13(b) is a plan view of the inner bumper.This is a longitudinal cross-sectional view showing the bumper and its surrounding structure in a modified example.Figure 15(a) is a perspective view of the inner bumper in a modified example, and Figure 15(b) is a plan view of the inner bumper. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all drawings, similar components are denoted by the same reference numerals, and their descriptions are omitted as appropriate. Furthermore, the various components of the gastrostomy catheter 100 of the present invention do not need to be independent entities. It is permissible for multiple components to be formed as a single component, for one component to be formed from multiple components, for one component to be part of another component, for a part of one component to overlap with a part of another component, and so on. Furthermore, in the following explanation, the downward direction in Figure 2 is assumed to be downward, and the upward direction is assumed to be upward. Also, the axial direction of the shaft 10 may be simply referred to as the axial direction, and the radial direction of the shaft 10 may be simply referred to as the radial direction. In addition, the circumferential direction of the shaft 10 may be simply referred to as the circumferential direction. [First Embodiment] First, the first embodiment will be described using Figures 1 to 8. As shown in Figures 1 and 2, the gastrostomy catheter 100 according to this embodiment includes a shaft 10 having a lumen 11, a body surface contact portion 20 provided at the upper end of the shaft 10, and a bumper 50 provided at the lower end of the shaft 10 that expands within the stomach. The gastrostomy catheter 100 includes a wire 60 for deploying the bumper 50 and a wire lumen 12 formed inside the tube wall of the shaft 10 and communicating with the inside of the bumper 50. The bumper 50 has an expansion portion 55 which is an expanding part, and the expansion portion 55 is not fixed to the outer surface of the shaft 10, and the wire 60 is arranged from the wire lumen 12 to the inside of the bumper 50. Here, as shown in Figure 3(a), the gastrostomy catheter 100 further includes a retraction-restricting structure 70 located in the internal space o