Medical instrument, catheter, and method for producing medical instrument

Patent metadata

Field	Value
Publication number	US-2016001040-A1
Application number	US-201414772237-A
Country	US
Kind code	A1
Filing date	Mar 7, 2014
Priority date	Mar 8, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A tubular body includes an elongated inner layer that demarcates a main lumen; a wire reinforcing layer that is formed by winding a reinforcing wire around the inner layer; a resinous elongated sub-tube that is arranged so as to extend along a longitudinal direction of the main lumen outside the wire reinforcing layer and demarcates a sub-lumen having a smaller diameter than the main lumen; a resinous outer layer that sheaths the wire reinforcing layer and the sub-tube; and a retaining wire. An operating wire is movably inserted through the sub-lumen, and has a tip connected to a distal portion of the tubular body. An operating part is operated to pull the operating wire to bend the distal portion of the tubular body. The retaining wire is sheathed by the outer layer, and winds together the sub-tube and the wire reinforcing layer. In a medical instrument (catheter), the retaining wire is in contact with a peripheral surface of the sub-tube on both an external diameter side and an outer surface of the wire reinforcing layer.

First claim

1 . A medical instrument comprising:
an elongated tubular body which comprises
an elongated inner layer which demarcates a main lumen,
a wire reinforcing layer which is formed by winding a reinforcing wire around the inner layer,
a resinous elongated sub-tube which is arranged so as to extend along a longitudinal direction of the main lumen outside the wire reinforcing layer and demarcates a sub-lumen having a smaller diameter than the main lumen, and
a resinous outer layer which sheaths the wire reinforcing layer and the sub-tube;
an operating wire which is movably inserted through the sub-lumen and has a tip connected to a distal portion of the tubular body; and an operating part which is operated to pull the operating wire to bend the distal portion of the tubular body, wherein the tubular body further includes a retaining wire which is sheathed by the outer layer and winds together the sub-tube and the wire reinforcing layer, and wherein the retaining wire is in contact with both a peripheral surface of the sub-tube on an external diameter side and an outer surface of the wire reinforcing layer.

2 . The medical instrument according to claim 1 ,
wherein the ductility of the retaining wire is higher than the ductility of the reinforcing wire.

3 . The medical instrument according to claim 1 ,
wherein two sub-tubes are arranged around the wire reinforcing layer to face each other at 180 degrees, and the operating wires are respectively inserted through the two sub-tubes, and wherein a retaining wire layer in which the retaining wire winds together the sub-tubes and the wire reinforcing layer has a shape selected from the group consisting of an elliptical shape, a lozenge shape, and a polygonal shape having a line obtained by connecting points, which are in contact with the two sub-tubes, as a major axis, in a horizontal sectional view of the tubular body.

4 . The medical instrument according to claim 3 ,
wherein the retaining wire layer is in contact with an outer surface of the wire reinforcing layer on both sides or one side in a radial direction orthogonal to the major axis.

5 . The medical instrument according to claim 1 ,
wherein multiple strands of the retaining wire layer are wound together to form a coil.

6 . The medical instrument according to claim 5 ,
wherein the wire diameter of the retaining wire is smaller than the wire diameter of the operating wire.

7 . The medical instrument according to claim 1 , further comprising:
a second reinforcing layer formed by winding a second reinforcing wire outside the retaining wire.

8 . The medical instrument according to claim 7 ,
wherein the ductility of the retaining wire is higher than the ductility of any one of the reinforcing wire and the second reinforcing wire.

9 . The medical instrument according to claim 7 ,
wherein the outer layer includes a first outer layer which sheathes the retaining wire and has an annular section, and a second outer layer which is provided around the first outer layer, sheathes the second reinforcing layer, and has an annular section.

10 . The medical instrument according to claim 9 ,
wherein the wire reinforcing layer is a braided layer formed by weaving together the reinforcing wire, wherein the mesh size of the braided layer in the circumferential direction is larger than the external diameter of the sub-tube, and wherein the first outer layer is impregnated between the wire reinforcing layer and the sub-tube.

11 . The medical instrument according to claim 9 ,
wherein the wire reinforcing layer is a braided layer formed by weaving together the reinforcing wire, and wherein the first outer layer is not substantially impregnated between the wire reinforcing layer and the sub-tube.

12 . A catheter which is the medical instrument according to claim 1 , further comprising:
a hub which is provided to communicate with the main lumen, wherein a syringe is mounted on the hub.

13 . A method for producing a medical instrument, comprising processes of:
winding a reinforcing wire around an elongated main core wire to form a wire reinforcing layer; arranging an elongated sub-core wire covered with a resinous sub-tube on an outer peripheral surface of the wire reinforcing layer along the main core wire, and winding together the arranged sub-core wire and the arranged wire reinforcing layer with a retaining wire; forming an outer layer so as to sheathe both the sub-core wire and the wire reinforcing layer wound together with the retaining wire, and the retaining wire, and forming a tubular body; elongating the sub-core wire to reduce the diameter of the sub-core wire to peel the sub-core-wire off from the sub-tube, and forming a sub-lumen; and extracting the main core wire from the tubular body to form a main lumen.

14 . The method for producing a medical instrument according to claim 13 , wherein, in the process of winding together the sub-core wire and the wire reinforcing layer with the retaining wire, two sub-tubes are arranged around an outer peripheral surface of the wire reinforcing layer to face each other at 180 degrees, and multiple strands of the retaining wire are coiled together such that points which are in contact with the sub-core wires of two retaining wires are arranged to face each other with the main core wire interposed therebetween.

Assignees

• Sumitomo Bakelite Co

Inventors

• Yamaguchi Kenjiro
• Kanemasa Kenichi

Classifications

• A61M25/005

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

• A61M25/0012 Primary

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

• A61M25/0147

  with movable mechanical means, e.g. pull wires · CPC title

• A61M25/0136

  Handles therefor · CPC title

• A61M25/0084

  being one or more injection needles · CPC title