Catheter and balloon catheter

Patent metadata

Field	Value
Publication number	US-2018078743-A1
Application number	US-201715467696-A
Country	US
Kind code	A1
Filing date	Mar 23, 2017
Priority date	Sep 21, 2016
Publication date	Mar 22, 2018
Grant date	—

Abstract

A catheter includes an inner layer, a reinforcement layer at least partially inside the inner layer or on an outer periphery of the inner layer, and an outer layer covering the inner layer and the reinforcement layer. The reinforcement layer has a wire wound so that a gap is present between adjacent portions of the wire. The inner layer has an uneven outer peripheral surface on which a protruded portion is formed in a location of the wire, and in which a depressed portion is formed in a location of the gap. The outer layer has a protrusion part that extends into the depressed portion of the inner layer, the protrusion part entering deeper than the reinforcement layer through the gap and extending in an axial direction of the catheter. The outer layer is not easily detached from the inner layer.

First claim

What is claimed is:

1 . A catheter comprising:
a tubular inner layer; a reinforcement layer present at least partially inside the inner layer or on an outer periphery of the inner layer, the reinforcement layer having a wire wound so that a gap is present between adjacent portions of the wire; and an outer layer covering the inner layer and the reinforcement layer, wherein: the inner layer has an uneven outer peripheral surface on which a protruded portion is formed in a location of the wire, and in which a depressed portion is formed in a location of the gap, and the outer layer has a protrusion part that extends into the depressed portion of the inner layer, the protrusion part extending beyond the reinforcement layer through the gap in a radial direction of the catheter and having a lower base that extends in an axial direction of the catheter.

2 . The catheter according to claim 1 , wherein a length of the lower base of the protrusion part of the outer layer in the axial direction of the catheter is longer than a length of the gap of the reinforcement layer in the axial direction of the catheter.

3 . A balloon catheter comprising:
the catheter according to claim 1 ; and a balloon joined to the outer layer, wherein: the outer layer has an uneven outer peripheral surface on which a protruded portion is formed in the location of the wire, and in which a depressed portion is formed in the location of the gap, the uneven outer peripheral surface of the outer layer being arranged along the outer peripheral surface of the inner layer, and the balloon enters into the depressed portion of the outer layer.

4 . A balloon catheter comprising:
the catheter according to claim 2 ; and a balloon joined to the outer layer, wherein: the outer layer has an uneven outer peripheral surface on which a protruded portion is formed in the location of the wire, and in which a depressed portion is formed in the location of the gap, the uneven outer peripheral surface of the outer layer being arranged along the outer peripheral surface of the inner layer, and the balloon enters into the depressed portion of the outer layer.

5 . The catheter according to claim 1 , wherein the reinforcement layer is present entirely inside the inner layer.

6 . The catheter according to claim 1 , wherein an inner peripheral surface of the reinforcement layer is present inside the inner layer, and an outer peripheral surface of the reinforcement layer is exposed to the outer layer.

7 . The catheter according to claim 1 , wherein the reinforcement layer is present on the outer periphery of the inner layer.

8 . The catheter according to claim 1 , wherein the reinforcement layer is a coil body.

9 . The catheter according to claim 1 , wherein the reinforcement layer is a braid having first wires wound in a first direction and second wires wound in a second direction, the first wires and the second wires being wound so that the gap is present between adjacent portions of the first wires and the second wires.

Assignees

• Asahi Intecc Co Ltd

Inventors

• Kubo Yuta
• Ogido Moritaka
• Katsurada Takeharu

Classifications

• A61M25/0045

  multi-layered, e.g. coated (coating materials A61L29/08) · CPC title

• A61M25/0012

  with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils · CPC title

• A61M25/104

  used for angioplasty · CPC title

• A61M2025/1079

  having radio-opaque markers in the region of the balloon · CPC title

• A61M25/005 Primary

  with embedded materials for reinforcement, e.g. wires, coils, braids · CPC title