Stent implantation system
First Claim
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1. Apparatus for implanting a radially expandable stent comprising:
- a catheter having a longitudinal axis and a lumen for conducting a fluid therethrough;
an axially disposed transaxially expandable balloon attached to said catheter in fluid flow communication with said lumen for inflation of said balloon, said balloon having two end sections and a waist section therebetween;
said balloon being formed of a shape memory material having memory so that two axially separated end sections of the balloon are expanded to a first diameter while the waist section, located between the two end sections, is inflated to a smaller diameter when the balloon is inflated to a first pressure and all sections of the balloon being expanded to a larger diameter when the balloon is inflated to a second higher pressure;
a radially expandable stent mounted in an unexpanded state over the waist section of said balloon between said end sections; and
inflation means connected to said lumen for inflating the balloon made from the shape memory material to said first pressure to capture the stent between the two expanded end sections of the balloon to prevent axial movement thereof prior to inflating said balloon to said second higher pressure to inflate the balloon to the larger diameter wherein the stent is expanded radially.
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Abstract
A device for implanting a radially expandable stent that includes a balloon catheter having a balloon formed of a material having a memory so that when inflated to a first pressure the two end sections of the balloon expand to a first diameter as the waist therebetween expands to a lesser diameter. The stent is mounted over the waist section of the balloon and is thus locked between the two end sections during initial inflation to the first pressure. Once locked in place, the pressure inside the balloon is raised to a second higher level whereby the entire balloon expands to a larger diameter thus radially expanding the stent.
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Citations
9 Claims
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1. Apparatus for implanting a radially expandable stent comprising:
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a catheter having a longitudinal axis and a lumen for conducting a fluid therethrough; an axially disposed transaxially expandable balloon attached to said catheter in fluid flow communication with said lumen for inflation of said balloon, said balloon having two end sections and a waist section therebetween; said balloon being formed of a shape memory material having memory so that two axially separated end sections of the balloon are expanded to a first diameter while the waist section, located between the two end sections, is inflated to a smaller diameter when the balloon is inflated to a first pressure and all sections of the balloon being expanded to a larger diameter when the balloon is inflated to a second higher pressure; a radially expandable stent mounted in an unexpanded state over the waist section of said balloon between said end sections; and inflation means connected to said lumen for inflating the balloon made from the shape memory material to said first pressure to capture the stent between the two expanded end sections of the balloon to prevent axial movement thereof prior to inflating said balloon to said second higher pressure to inflate the balloon to the larger diameter wherein the stent is expanded radially. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification