Method for manufacturing medical long body

Patent metadata

Field	Value
Publication number	US-10485947-B2
Application number	US-201715416455-A
Country	US
Kind code	B2
Filing date	Jan 26, 2017
Priority date	Sep 29, 2014
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A method of manufacturing a medical elongated body including an inner layer, an outer layer covering the outside of the inner layer, and a reinforcement body provided between the inner layer and the outer layer. The method includes an inner layer forming step of forming the inner layer, a reinforcement body forming step of forming the reinforcement body on an outer peripheral surface of the inner layer after the inner layer forming step, a cooling step of cooling at least a predetermined spot of the inner layer after the reinforcement body forming step, and an annealing step of annealing the reinforcement body which overlaps the predetermined spot of the inner layer cooled by the cooling step.

First claim

What is claimed is:

1. A method of manufacturing a medical elongated body including an inner layer, an outer layer covering the outside of the inner layer, and a reinforcement body provided between the inner layer and the outer layer, the method comprising:
an inner layer forming step of forming the inner layer;
a reinforcement body forming step of forming the reinforcement body on an outer peripheral surface of the inner layer immediately after the inner layer forming step;
after forming the reinforcement body on the outer peripheral surface of the inner layer, a cooling step of cooling at least a predetermined spot of the inner layer; and
an annealing step of annealing the reinforcement body which overlaps the predetermined spot of the inner layer cooled by the cooling step;
wherein in the cooling step, the predetermined spot is cooled by a coolant having a temperature of −10° C. or lower; and
wherein in the cooling step, the predetermined spot is cooled by dipping the predetermined spot in liquid nitrogen before performing the annealing step.

2. The method of manufacturing the medical elongated body according to claim 1 , wherein the inner layer is formed of thermoplastic resin.

3. The method of manufacturing the medical elongated body according to claim 1 , wherein the inner layer is formed of resin having a thermal conductivity in a range of 0.05 W·m −1 ·K −1 to 1 W·m −1 ·K −1 , and the reinforcement body is formed of a reinforcement wire having a thermal conductivity in a range of 5 W·m −1 K −1 to 500 W·m −1 ·K −1 .

4. The method of manufacturing the medical elongated body according to claim 1 , further comprising an outer layer forming step of forming the outer layer such that the reinforcement body on the outer peripheral surface of the inner layer is covered by the outer layer.

5. The method of manufacturing the medical elongated body according to claim 4 , wherein the outer layer forming step is performed after the cooling and annealing steps.

6. A method of manufacturing a medical elongated body including an inner layer, an outer layer covering the outside of the inner layer, and a reinforcement body provided between the inner layer and the outer layer, the method comprising:
an inner layer forming step of forming the inner layer;
a reinforcement body forming step of forming the reinforcement body on an outer peripheral surface of the inner layer immediately after the inner layer forming step;
after forming the reinforcement body on the outer peripheral surface of the inner layer, a cooling step of cooling at least a predetermined spot of the inner layer;
an annealing step of annealing the reinforcement body which overlaps the predetermined spot of the inner layer cooled by the cooling step; and
further comprising an outer layer forming step of forming the outer layer such that the reinforcement body on the outer peripheral surface of the inner layer is covered by the outer layer;
wherein the outer layer forming step is performed before the cooling and annealing steps, and further comprising, an outer layer removing step of removing a portion of the outer layer and thereby defining the predetermined spot of the inner layer.

7. A method of manufacturing a medical elongated body, the method comprising:
forming an inner layer;
forming a reinforcement body on an outer peripheral surface of the inner layer;
cooling at least a predetermined portion of the inner layer; and
after cooling, annealing at least the reinforcement body which overlaps the predetermined portion of the inner layer;
wherein in the cooling step, the predetermined portion is cooled by dipping at least the predetermined portion in a coolant before performing the annealing step.

8. The method of manufacturing the medical elongated body according to claim 7 , wherein the inner layer is formed of a resin and the reinforcement body is formed of a reinforcement wire, the reinforcement body having a higher thermal conductivity than the inner layer.

9. The method of manufacturing the medical elongated body according to claim 8 , wherein the resin has a thermal conductivity in a range of 0.05 W·m −1 ·K −1 to 1 W·m −1 ·K −1 and the reinforcement body has a thermal conductivity in a range of 5 W·m −1 ·K −1 to 500 W·m −1 ·K −1 .

10. The method of manufacturing the medical elongated body according to claim 7 , further comprising forming an outer layer such that the reinforcement body on the outer peripheral surface of the inner layer is covered by the outer layer.

11. The method of manufacturing the medical elongated body according to claim 10 , wherein the outer layer forming step is performed before the cooling and annealing steps.

12. The method of manufacturing the medical elongated body according to claim 11 , further comprising an outer layer removing step of removing a portion of the outer layer and thereby defining the predetermined portion of the inner layer.

13. The method of manufacturing the medical elongated body according to claim 10 , wherein the outer layer forming step is performed after the cooling and annealing steps.

14. The method of manufacturing the medical elongated body according to claim 7 , wherein in the cooling step, the predetermined portion is cooled by a coolant having a temperature of −10° C. or lower.

15. A method of manufacturing a medical elongated body including an inner layer, an outer layer covering the outside of the inner layer, and a reinforcement body provided between the inner layer and the outer layer, the method comprising:
an inner layer forming step of forming the inner layer;
a reinforcement body forming step of forming the reinforcement body on an outer peripheral surface of the inner layer immediately after the inner layer forming step;
after forming the reinforcement body on the outer peripheral surface of the inner layer, a cooling step of cooling at least a predetermined spot of the inner layer; and
an annealing step of annealing the reinforcement body which overlaps the predetermined spot of the inner layer cooled by the cooling step;
wherein in the cooling step, the predetermined spot is cooled by dipping the predetermined spot in coolant before performing the annealing step.

Assignees

• Terumo Corp

Inventors

• Hamuro Kouta

Classifications

• B29C48/0022

  combined with cutting · CPC title

• B29C48/21

  the layers being joined at their surfaces · CPC title

• B29C48/00

  Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C49/04) · CPC title

• B29C48/09

  Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels · CPC title

• B29C2793/0027

  Cutting off · CPC title