Sheath manufacturing method

Abstract

This invention provides a medical device and a sheath manufacturing method that enable the strength of the operating wire to be ensured while reducing the thickness of the sheath. [Solution] The medical device (stent delivery device) comprises a sheath 3 and an operating wire 4 whose distal end is attached to the tip of the sheath 3 (outer sheath 31), and which bends the sheath 3 when pulled. The sheath 3 has a main lumen 6a through which a guide wire passes and a sub-lumen 7a through which the operating wire 4 passes, both extending parallel to the axial direction (axis A1 direction). Two operating wires 4 are provided separately within one sub-lumen 7a. The two operating wires 4 are arranged side by side in the circumferential direction of the sheath 3.

Claims

1. Sheath and, The sheath is equipped with an operating wire attached to the tip of the sheath, which bends the sheath when pulled, The sheath has a main lumen through which the guide wire passes, and a sub-lumen through which the operating wire passes, both extending parallel to the axial direction. Multiple operating lines are provided separately within one of the sub-brumens. A medical device characterized in that the multiple control wires are arranged in parallel in the circumferential direction of the sheath.

2. The medical device according to claim 1, wherein the sub-blumen is formed in a flattened cross-section, and the longitudinal direction of its cross-section is aligned with the circumferential direction of the sheath.

3. The sub-blumen is defined by the inner wall of the sub-blumen tube, The inner wall of the sub-blumen tube has a constricted shape due to a projection arranged parallel to the axial direction. The medical device according to claim 1 or 2, wherein the aforementioned protrusion is disposed between a plurality of the aforementioned operating lines.

4. The medical device according to claim 3, wherein the distance between the portion of the inner wall of the sub-blumen tube facing the protrusion and the protrusion is greater than the diameter of the operating wire.

5. The medical device according to claim 3, wherein the distance between the portion of the inner wall of the sub-blumen tube facing the protrusion and the protrusion is smaller than the diameter of the operating wire.

6. The tip of the sheath is provided with a radiopaque ring-shaped marker. An engaging portion is formed on the outer surface of the marker, which engages with the operating line. The medical device according to any one of claims 1 to 5, wherein the engaging portion extends in the circumferential direction of the marker.

7. An operating part is provided at the base end of the sheath, The medical device according to any one of claims 1 to 6, wherein the plurality of operating wires arranged in parallel in the circumferential direction of the sheath without being twisted together are twisted together between the sheath at the base end and the operating part.

8. Sheath and, A method for manufacturing a sheath for a medical device, comprising: an operating wire attached to the tip of the sheath and used to bend the sheath when pulled; The sheath has a main lumen through which the guide wire passes, and a sub-lumen through which the operating wire passes, both extending parallel to the axial direction. A sheath manufacturing method characterized by comprising a step of arranging a plurality of operating wires separately within one sub-flumen so as to be arranged in parallel in the circumferential direction of the sheath.

9. Prior to the operation wire arrangement step, the molding step includes forming a main lumen tube defining at least a portion of the main lumen with a first core wire, and forming a sub-lumen tube defining at least a portion of the sub-lumen with a second core wire having a flattened cross-section. In the molding process, The sheath manufacturing method according to claim 8, wherein the second core wire is arranged around the first core wire with the longitudinal direction of its cross-section facing the circumferential direction of the first core wire, thereby forming the main lumen and the sub-lumen.

10. Prior to the operation wire arrangement step, the process includes a molding step in which a main lumen tube defining at least a portion of the main lumen is formed by a first core wire, and a sub-lumen tube defining at least a portion of the sub-lumen is formed by a second core wire. The sheath manufacturing method according to claim 8, wherein in the molding step, a resin film that will become the sub-blumen tube is formed on the outside of a plurality of second core wires, the plurality of second core wires are arranged in parallel around the first core wire, the arranged second core wires are removed, and the portion sandwiched between the arranged second core wires in the sub-blumen tube is removed to form the sub-blumen with a flattened cross-section that communicates.

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