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Non-Homogenous Stent Crimping System

IP.com Disclosure Number: IPCOM000145877D
Publication Date: 2007-Jan-30
Document File: 2 page(s) / 38K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure relates to a system and method of securing a bifurcated stent onto the distal end of a balloon catheter. With bifurcation stent delivery systems, portions have cross sectional profiles that are non-symmetrical. This is due to the inclusion of a secondary lumen to access the side branch that is incorporated under a portion of the crimped stent.

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Title:

Non-Homogenous Stent Crimping System

Background:

This disclosure relates to a system and method of securing a bifurcated stent onto the distal end of a balloon catheter. With bifurcation stent delivery systems, portions have cross sectional profiles that are non-symmetrical. This is due to the inclusion of a secondary lumen to access the side branch that is incorporated under a portion of the crimped stent.

Stents are implanted devices used to repair damaged blood vessels. The general concept of a stent is a small hollow cylinder, flexible mesh or slotted tube, that once deployed provides support for vessel walls without obstructing blood flow.

A bifurcated region is where branching occurs. A main blood vessel is segmented into side branch vessels. Here the design of the stent delivery system has been challenging due to achieving proper alignment, adequate access and delivery of secondary devices post-stent deployment.

Description:

It is an objective of this disclosure to provide a method and apparatus for loading a bifurcated stent onto a balloon expandable stent delivery system wherein the delivery system comprises a crossing profile and flexibility suitable for use in tortuous and narrowed anatomy.

The delivery system consists of a crimped stent mounted onto a balloon, multiple wires to access the main lumen and the side branch lumen and inflation / deflation lumen to control expansion and withdrawal of the balloon.

The flexible stent is disposed on the balloon of a delivery catheter, and the balloon and stent are placed within an elastic crimping tube or sleeve. This assembly is then placed in a crimping tool. The crimping tool is actuated to compress the stent on the outside of the folded balloon and to cause the profile of the non-uniform delivery system to decrease.

This disclosure discusses the design of the force distribution sleeve with a two distinctions. One being a varying cross section profile and the second providing a sleeve with multiple materials to create varying material properties on one sleeve. Once the stent is secured to the balloon, the catheter can satisfactorily advance through the vascular system of the patient.

Bifurcation stent delivery systems are generally asymmetrical. In addition, the cross sectional profiles vary along the delivery system. One challenge of interest is crimping the non-uniform bifurcated stent onto the folded balloon of this delivery catheter.

In the past, un...