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Catheter and its manufacturing method

A manufacturing method and catheter technology, applied in the direction of catheters, coatings, etc., can solve the problem of detachment of the front end of the catheter, achieve the effect of inhibiting performance changes and improving the bonding force

Active Publication Date: 2019-02-05
TERUMO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the distal end of the catheter has a curved shape, if the curved portion of the distal end is too soft, the distal end of the catheter can be inserted into a PTCA catheter after engaging the coronary artery orifice from the aorta, etc. operation, the tip of the catheter is easily detached from the coronary hole

Method used

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  • Catheter and its manufacturing method
  • Catheter and its manufacturing method
  • Catheter and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0083] Use Shore D68 polyester elastomer as the inner layer material, use Shore D52 polyester elastomer as the outer layer material, and extrude Shore D68 polyester elastomer as the inner layer material on the core wire Body, thus making the inner tube. Next, while heating the outer surface of the inner tube, stainless steel planar reinforcing wires (wires) with a width of 110 μm and a thickness of 35 μm were braided and wound at intervals of 0.2 mm (16 braided wires) to obtain an intermediate structure.

[0084] Thereafter, cover the outer layer tube made of Shore D52 as the material of the outer layer on the intermediate structure, and then cover the outer side of the heat shrinkable tube, use the heating source to heat from one end side, and make the heating source slowly toward The other end moves sideways, thereby joining the inner tube and the outer tube. Then, the core wire is pulled out to make a catheter body. Thus, a catheter body having an outer diameter of 2.06 m...

Embodiment 2

[0087] A polyester elastomer of Shore D78 was used as the material of the inner layer, a polyester elastomer of Shore D52 was used as the material of the outer layer, and other conditions were the same as in Example 1 to manufacture a catheter body. Thus, a catheter body having an outer diameter of 2.06 mm, an inner diameter of 1.80 mm, and a ratio of inner and outer diameters of 0.87 penetrating the lumen was obtained.

[0088] Thereafter, a part of the manufactured catheter body was cut in the axial direction, and the cross-section was observed. Figure 10 A photograph taken of a cut surface of the catheter body of the second embodiment is shown in . like Figure 10 As shown, it was confirmed that one protruding portion was formed to extend in the axial direction on the radially outer side of each reinforcing wire constituting the reinforcing member. It is presumed that since the material of the inner layer has a higher melting point and higher viscosity than that of the f...

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Abstract

There is provided a catheter which has at least a two-layered structure and can suppress decrease in function thereof by suppressing the disorder at an interface between layers during use, and a method for manufacturing the same. The catheter (1) has an inner layer (6) as a tube shaped body made of a thermoplastic resin and an outer layer (7), as a tube shaped body made of a thermoplastic resin, coming into contact with the outer surface of the inner layer (6), and has a reinforcement member (8) which is at least partially embedded in the inner layer (6) and includes a gap (81) leading the inner layer (6) toward the radial outside of the catheter 1. The inner layer (6) has a protrusion (61) which extends in an axial direction of the catheter (1) while protruding from the gap (81) to the radial outside, is positioned on the radial outside of the reinforcement member (8), and ingrows into the outer layer (7).

Description

technical field [0001] The present invention relates to a catheter inserted into a lumen of a living body and a manufacturing method thereof, and more particularly to a guide catheter for guiding a PTCA catheter or the like to a target site and a manufacturing method thereof. Background technique [0002] A guide catheter is a catheter for guiding when a PTCA catheter or the like used for treating a coronary artery of the heart is inserted into a target site. [0003] In order to reduce the burden on the patient (specifically, to reduce the incision of the blood vessel insertion part and reduce the friction with the blood vessel), the guide catheter is required to have a smaller outer diameter. On the other hand, the PTCA catheter used for treatment is required to be larger in order to exert sufficient effect on the treatment site. Therefore, a larger inner diameter of the guide catheter is required. [0004] As the outer diameter of the guide catheter, in recent years, fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M25/00A61M25/14
CPCA61M25/005A61M25/0012A61M25/0045A61M2025/006
Inventor 大岳裕八羽室皓太田代纮一郎上田真理子福冈彻也
Owner TERUMO KK
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