Dilatation catherter apparatus
First Claim
1. A dilatation catheter comprising a pair of concentrically disposed spaced apart inner and outer flexible tube members, a first annular inner inflatable bag attached to the distal end of said inner tube member and attached at its other end to a first tip member, a second annular outer inflatable bag in superposed relation to said first bag attached to the distal end of said outer tube member and attached at its other end to a second tip member, a wire extending through said inner tube member and said first bag and secured to said first tip member operable upon axial rotation thereof to axially twist said first bag and thereby decrease its diameter in its non-inflated condition, first means to inflate and deflate said first bag through said inner tube member, and second means operable independently of said first means to inflate and deflate said second bag through said outer tube member.
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Accused Products
Abstract
A dilatation catheter is provided with a double lumen tube and inner and outer inflatable and deflatable balloon elements, one within the other. The inner bag element is twisted for retraction while the outer bag element is inflated. Subsequent deflation of the outer bag element serves to further laterally compress the inner bag element and provide a smooth buffering surface for engagement with blood vessel walls as the catheter is moved past them.
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Citations
6 Claims
- 1. A dilatation catheter comprising a pair of concentrically disposed spaced apart inner and outer flexible tube members, a first annular inner inflatable bag attached to the distal end of said inner tube member and attached at its other end to a first tip member, a second annular outer inflatable bag in superposed relation to said first bag attached to the distal end of said outer tube member and attached at its other end to a second tip member, a wire extending through said inner tube member and said first bag and secured to said first tip member operable upon axial rotation thereof to axially twist said first bag and thereby decrease its diameter in its non-inflated condition, first means to inflate and deflate said first bag through said inner tube member, and second means operable independently of said first means to inflate and deflate said second bag through said outer tube member.
Specification