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Catheter

A catheter and main body technology, applied in the field of outer catheters, can solve problems such as peeling, cracking, unbalance, etc., and achieve the effect of reducing stress concentration

Inactive Publication Date: 2014-08-20
ASAHI INTECC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the stress 300a that stretches the first outer layer 280a toward the rear end and the stress 300b that pulls the second outer layer 280b toward the front end are unbalanced, and the stress concentrates on the first outer layer 280a and the second outer layer 280a having different rigidities. The boundary of the layer 280b has the problem of cracks or the peeling of the second outer layer 280b from the inner layer 240

Method used

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Embodiment Construction

[0039] refer to Figure 1 to Figure 8 , the catheter 1 of this embodiment will be described. exist Figure 1 ~ Figure 3 , Image 6 , Figure 7 In the figure, the left side of the illustration is the front end side (distal side) inserted into the body, and the right side is the rear end side (proximal side, base end side) operated by the operator such as a doctor.

[0040] figure 1 The shown catheter 1 is a tubular medical device with a total length of about 1200 mm. The catheter 1 mainly includes: a flexible catheter shaft 10 ; a front end top 12 bonded to the front end of the catheter shaft 10 ; and a connector 14 fixed to the rear end of the catheter shaft 10 .

[0041] like figure 2 , image 3 As shown, the catheter shaft 10 includes an inner layer 24 , a braided layer 26 as a reinforcing body, a middle layer 29 , and an outer layer 28 sequentially from the inner side in the radial direction.

[0042] Inner layer 24 is formed of resin and forms lumen 18 for insert...

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Abstract

In a catheter (1), since the thickness of an intermediate layer (29) is constant from a body (10a) to a distal end portion (10b), the adhesive strength (adhesiveness) between the intermediate layer (29) and an inner layer (24) is uniform from the body (10a) to the distal end portion (10b) of a catheter shaft (10). Therefore, when the catheter (1) is curved, the movement of a braid (26) caused by the curving of the catheter (1) can be uniformly suppressed from the body (10a) to the distal end portion (10b) that is adjacent thereto. Even if, when the catheter (1) is curved, a tensile stress (30a) towards a proximal end acts upon a first outer layer (28a) at the body (10a) and a tensile stress (30b) towards a distal end acts upon a second outer layer (28b) at the distal end portion (10b) adjacent to the body (10a), the first and second outer layers (28a, 28b) are caught by an uneven contour of the intermediate layer (29) by an anchor effect, so that it is possible to prevent peeling of the first and second outer layers (28a, 28b) from an intermediate layer (29).

Description

technical field [0001] The present invention relates to a catheter to be inserted into a blood vessel, and more particularly to a catheter having an outer layer of different rigidity. Background technique [0002] A catheter inserted into a blood vessel is a medical device having an elongated and flexible structure. Catheters are used for inspections to diagnose diseases (for example, to identify the site of a stenosis requiring treatment, or to grasp the progress of a stenosis), or for treatment to treat a disease (for example, to dilate a stenosis in a stenosis, or It is used to introduce medicine into the stenosis). [0003] Catheters for inspection and treatment generally include an inner layer made of resin, an outer layer made of resin covering the outer periphery of the inner layer, and a wire made of metal interwoven between the inner layer and the outer layer. The braided layer as reinforcement. The performance required for a catheter includes various performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M25/00B32B1/08
CPCA61M25/0045A61M2025/0059A61M25/0053A61M25/005
Inventor 宫田尚彦大岛史义
Owner ASAHI INTECC CO LTD
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