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JP-2026075726-A - Expansion devices

JP2026075726AJP 2026075726 AJP2026075726 AJP 2026075726AJP-2026075726-A

Abstract

[Challenge] The objective is to provide an expansion device that ensures blood flow and is highly versatile. [Solution] The expansion device 1 comprises a hollow outer shaft 11 having a slot 11a that penetrates radially and extends along the long axis, an inner shaft 21 positioned in the lumen 11h of the outer shaft 11 and rotatable relative to the outer shaft 11, and an expansion member 31 positioned to pass through the slot 11a, with one end joined to the outer shaft 11 and the other end opposite to the one end joined to the inner shaft 21. By rotating the inner shaft 21 relative to the outer shaft 11 so that the expansion member 31 expands radially outward, the expansion member 31 is pushed out of the slot 11a. [Selection Diagram] Figure 6

Inventors

  • ナッタナン カッドプール
  • アンシサー ソンクラームスック

Assignees

  • 朝日インテック株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (7)

  1. A hollow outer shaft (11, 13) having slots (11a, 13a) that penetrate radially and extend along the longitudinal axis, An inner shaft (21, 23) is positioned in the lumen (11h, 13h) of the outer shaft (11, 13) and is rotatable relative to the outer shaft (11, 13), The system includes expansion members (31, 32, 34) arranged to pass through the slots (11a, 13a), with one end joined to the outer shafts (11, 13) and the other end opposite to the one end joined to the inner shafts (21, 23), Expansion devices (1, 2, 3) in which the expansion members (31, 32, 34) are pushed out of the slots (11a, 13a) by rotating the inner shafts (21, 23) relative to the outer shafts (11, 13) so that the expansion members (31, 32, 34) expand radially outward.
  2. By rotating the inner shafts (21, 23) relative to the outer shafts (11, 13) in a first direction, the expansion members (31, 32, 34) expand radially outward. The expansion device (1, 2, 3) according to claim 1, wherein the expansion members (31, 32, 34) contract radially inward by rotating the inner shafts (21, 23) relative to the outer shafts (11, 13) in a second direction opposite to the first direction.
  3. The expansion device (1, 2, 3) according to claim 1 or 2, wherein when the expansion members (31, 32, 34) are expanded, the inner circumference of the expansion members (31, 32, 34) and the outer circumference of the outer shafts (11, 13) are partially separated.
  4. The expansion device (1, 2, 3) according to any one of claims 1 to 3, wherein the maximum distance (Lmax) between the major axis (Z) and the expansion members (31, 32, 34) varies depending on the circumferential position of the outer shafts (11, 13).
  5. The expansion device (1, 3) according to any one of claims 1 to 4, wherein the expansion members (31, 34) are formed of wire.
  6. The expansion member (32) is formed of a sheet, as described in any one of claims 1 to 4.
  7. The outer shaft (13) is formed from an outer coil body (13) in which strands (w1) are wound in a spiral shape. The expansion device (3) according to any one of claims 1 to 6, wherein the inner shaft (23) is formed of an inner coil body (23) in which strands (w2) are wound in a spiral shape.

Description

This disclosure relates to an expansion device. One known medical device is the balloon catheter. Balloon catheters are used, for example, to widen narrowed areas in blood vessels or to remove blood clots. As a balloon catheter, for example, one has been proposed in which a balloon is placed in the middle of the shaft and the balloon is expanded by injecting an expansion fluid (see, for example, Patent Document 1). Japanese Patent Publication No. 2007-252895 This is a schematic longitudinal cross-sectional view showing the first embodiment.This is a schematic perspective view showing an enlarged portion of Figure 1.This is a schematic cross-sectional view taken along the line III-III in Figure 1, showing the expansion member in its unexpanded state.Figure 3 is a schematic cross-sectional view showing the expanded member in its expanded state.This is a schematic perspective view showing an enlarged portion of the second embodiment.This is a schematic perspective view showing an enlarged portion of the third embodiment.This is a schematic perspective view showing an enlarged portion of another embodiment. (1) The expansion device of the present disclosure comprises a hollow outer shaft having a slot that penetrates radially and extends along the longitudinal axis; an inner shaft disposed within the lumen of the outer shaft and rotatable relative to the outer shaft; and an expansion member disposed to pass through the slot, with one end joined to the outer shaft and the other end opposite to the one end joined to the inner shaft, wherein the expansion member is pushed out of the slot by rotating the inner shaft relative to the outer shaft so that the expansion member expands radially outward. This configuration allows for adjustment of the degree to which the expansion member expands. As a result, it eliminates the need to prepare balloon catheters of specific sizes, thus improving versatility. In addition, it helps to suppress blood flow obstruction even when the expansion member is expanding. (2) In the expansion device described in (1) above, the expansion member may expand radially outward by rotating the inner shaft in a first direction relative to the outer shaft, and the expansion member may contract radially inward by rotating the inner shaft in a second direction opposite to the first direction relative to the outer shaft. With this configuration, the expansion member can be easily and repeatedly expanded and contracted. (3) In the expansion devices of (1) and (2) above, when the expansion member is expanded, the inner circumference of the expansion member and the outer circumference of the outer shaft may be partially separated. This configuration allows the expansion member to be extended radially outward. (4) In the expansion devices described in (1) to (3) above, the maximum distance between the long axis and the expansion member may vary depending on the circumferential position of the outer shaft. This configuration allows the extension member to be extended asymmetrically with respect to its long axis. (5) In the expansion devices described in (1) to (4) above, the expansion member may be made of wire. This configuration allows for applying significant localized pressure to the lesion, enabling, for example, the creation of an incision in the lesion. (6) In the expansion devices described in (1) to (4) above, the expansion member may be made of a sheet. This configuration allows for the expansion of the lesion without applying significant local pressure to the lesion. (7) In the expansion devices of (1) to (6) above, the outer shaft may be formed of an outer coil body in which strands of wire are wound in a spiral shape, and the inner shaft may be formed of an inner coil body in which strands of wire are wound in a spiral shape. This configuration enhances the flexibility and body cavity conformability of the expansion device, while also improving torque transmission. In this specification, "tip side" refers to the direction along the long axis of the expansion device (long axis direction) in which the expansion device advances toward a predetermined site within the body cavity (distal side). "Proximal side" refers to the direction along the long axis of the expansion device (long axis direction) in the opposite direction to the tip side (proximal side). "Tip" refers to the tip end of any member. "Proximal end" refers to the proximal end of any member. "Radial direction" refers to the radial direction perpendicular to the long axis of the expansion device. The first to third embodiments of this disclosure will be described with reference to the drawings. This disclosure is not limited to the embodiments shown in the drawings. The dimensions of the parts shown in the drawings are for illustrative purposes only and do not necessarily correspond to actual dimensions. In Figures 1, 2, and 5-7, the left side of the diagram represents the distal end (the tip side) inserted deeper into the body, while