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
CN1561240AInactive Publication Date: 2005-01-05KANEKA CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KANEKA CORP
Publication Date
2005-01-05
Estimated Expiration
Not applicable · inactive patent

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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.
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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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