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Stent delivery catheter

A catheter and balloon catheter technology, applied in catheters, stents, balloon catheters, etc., can solve problems such as reducing the sensitivity of balloon inflation and contraction

Inactive Publication Date: 2005-01-05
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the base end of the stylet is designed to be located at the bushing element, which comprises the base portion of the catheter shaft, the stylet is essentially present in the entire gas-filled lumen, thereby Reduced sensitivity to balloon inflation and contraction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0103] A tubular billet (inner diameter 0.51 mm, outer diameter 1.02 mm) was produced from a polyamide elastomer for extrusion molding (manufactured by Elf Atochem, trade name PEBAX7033SA01). The blank is formed into an airbag by a biaxial stretch blow forming process. The outer diameter of the straight pipe section of the airbag is 3.0 millimeters, and the inner diameter of the connecting part with the anti-displacement device is 0.95 millimeters.

[0104] The inner tube (inner diameter 0.42 mm, outer diameter 0.56 mm) and outer tube (inner diameter 0.71 mm, outer diameter 0.88 mm) were made of extrusion polyamide elastomer (manufactured by Elf Atochem, product name PEBAX7233SA01).

[0105] Polyamide elastomer (manufactured by Elf Atochem, trade name PEBAX7033SA01) is used for extrusion molding as a material to make a tubular anti-displacement device (inner diameter 0.65 mm, outer diameter 0.79 mm) on the far side of the airbag.

[0106] Polyamide elastomer (manufactured by ...

example 2

[0111] The prepared sample is the same as Example 1 except that the outer tube is used as the anti-displacement device on the proximal side of the airbag.

example 3

[0113] A sample was prepared, wherein the outer diameter of the part that stretched into the cone section at the far end of the air bag as the anti-displacement device at the far end of the air bag increased to 1.20 millimeters, and the anti-displacement device was like the tubular element in example 1; The outer diameter of the portion of the end-side anti-displacement device that protrudes into the cone section at the proximal end of the airbag is also increased to 1.20 mm. This anti-displacement device is like the tubular element in Example 1. In addition, the inner diameter of the connection between the airbag and the two anti-displacement devices is adjusted to 1.25 mm. The rest are the same as the sample of Example 1.

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PUM

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Abstract

The present invention provides a stent delivery catheter that can place a stent in a tortuous narrowed area with good maneuverability while preventing falling or displacement of the stent. <??>The present invention provides a stent delivery catheter for delivering a stent for treating stenosis in a body to a narrowed area. A distal end of the catheter includes a collapsible balloon in a collapsed state and the stent in an undeployed state, the stent being mounted on the outer surface of the collapsed balloon, the balloon having frustoconical tapered segments and a cylindrical straight tubular segment. An inner tube for defining a guidewire lumen extends into the interior of the balloon, and displacement prevention mechanisms for preventing the stent from moving in the longitudinal direction of the stent delivery catheter are affixed to the inner surface of the balloon only. Another aspect of the present invention provides a stent delivery catheter that can prevent the stent from moving in the axis direction of the catheter without requiring additional components or additional steps that complicate the manufacturing process. In this catheter, the thickness T1 of a near-center portion of the distal-end tapered segment and the thickness T2 of a near-center portion of the straight tubular segment satisfy a predetermined relationship, and the thickness T3 of a near-center portion of the proximal-end tapered segment and the thickness T2 of the near-center portion of the straight tubular segment satisfy a predetermined relationship. In this manner, the distal-end and proximal-end tapered segments in the collapsed state prevent the movement of the stent. The present invention also provides a preferable RX balloon catheter, i.e., a stent delivery catheter, having improved maneuverability and enhanced responsiveness for expansion and contraction of the balloon without complicating the manufacturing process or increasing the cost.

Description

technical field [0001] The present invention generally relates to catheters for introducing and placing stents for dilating narrowed areas of blood vessels, esophagus, trachea, urethra, bile duct, and the like. In particular, the present invention relates to delivery catheters for introducing and deploying stents into coronary artery stenosis. Background technique [0002] A stent left in a narrow portion of a lumen such as a blood vessel, esophagus, trachea, urethra, and bile duct is a widely used device that is effective in maintaining the patency of the lumen. The stent is introduced into the tract in an unexpanded state and placed at the site of the stenosis, then expanded to a predetermined size and left in that position. [0003] Stents can be broadly classified into two types according to their mechanism of expansion to a predetermined size. One is self-expanding stents, which are composed of shape memory alloys and do not require mechanical expansion. The other is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/958A61M25/12
CPCA61M2025/0063A61M2025/0183A61F2/958A61F2002/9586A61M29/00
Inventor 西出拓司三木章伍
Owner KANEKA CORP
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