Apparatus and method to position a stent
First Claim
1. A stent placement device comprising:
- a guiding catheter having a hollow bore and proximal and distal ends and at least one stabilizing wire threaded through the hollow bore having proximal and distal ends;
a stent, with proximal and distal ends, inflation expandable from a delivery diameter to a deployment diameter, such that the delivery diameter is reduced from the deployment diameter to allow passage through the guiding catheter, such that the stent, in its delivery diameter, is coaxially mounted within the guiding catheter near the catheter distal end and attached to a balloon catheter;
the balloon catheter coaxially positioned within the guiding catheter for expansion of the stent at a deployment site from the delivery diameter to the deployment diameter upon application of deployment pressure to a balloon catheter expandable inflation means;
the balloon catheter comprising a shaft and the expandable inflation means being positioned at a distal part of the shaft, a releasably mounting and retaining means being positioned for receiving the stent on the expandable inflation means for radial expansion and release of the stent upon expansion of the expandable inflation means;
a deployment site regulator, comprising a means to attach the balloon catheter and the distal end of the stabilizing wire and an expandable positioning means to allow the stent to be positioned at the deployment site by frictionally engaging adjacent structures near the deployment site, the expandable positioning means having a pre-deployment diameter to allow passage through the guiding catheter, and the deployment diameter to provide support to engage the adjacent deployment site structures after passage through the guiding catheter.
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Accused Products
Abstract
A stent designed with an attachable positioning apparatus to effectively place the stent at the precise deployment site within a narrowed vascular region such as an artery. In the preferred embodiment, the present invention comprises a stabilizing wire. The positional apparatus is, for example, frictionally engaged to the stent balloon and adjacent wire loops for frictional engagement with the walls to position the stent at the deployment site. Other means to engage the positional apparatus and stent balloon and adjacent wire loops can include: elastic bands, adhesion, or polymer bonding. The stent is maneuvered through the vessel by a balloon catheter that is guided by a guiding catheter up the vessel to where the narrowing is located. Upon exiting the guiding catheter and approaching the deployment site within the coronary artery, the wire loops expand and frictionally engage the artery walls and, thereby, effectively position the stent at the deployment site within the narrowed vessel. This apparatus and method is particularly useful for stent placement at an ostium (origin) of a vascular region.
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Citations
26 Claims
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1. A stent placement device comprising:
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a guiding catheter having a hollow bore and proximal and distal ends and at least one stabilizing wire threaded through the hollow bore having proximal and distal ends;
a stent, with proximal and distal ends, inflation expandable from a delivery diameter to a deployment diameter, such that the delivery diameter is reduced from the deployment diameter to allow passage through the guiding catheter, such that the stent, in its delivery diameter, is coaxially mounted within the guiding catheter near the catheter distal end and attached to a balloon catheter;
the balloon catheter coaxially positioned within the guiding catheter for expansion of the stent at a deployment site from the delivery diameter to the deployment diameter upon application of deployment pressure to a balloon catheter expandable inflation means;
the balloon catheter comprising a shaft and the expandable inflation means being positioned at a distal part of the shaft, a releasably mounting and retaining means being positioned for receiving the stent on the expandable inflation means for radial expansion and release of the stent upon expansion of the expandable inflation means;
a deployment site regulator, comprising a means to attach the balloon catheter and the distal end of the stabilizing wire and an expandable positioning means to allow the stent to be positioned at the deployment site by frictionally engaging adjacent structures near the deployment site, the expandable positioning means having a pre-deployment diameter to allow passage through the guiding catheter, and the deployment diameter to provide support to engage the adjacent deployment site structures after passage through the guiding catheter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification