Angioplasty catheter assembly
First Claim
1. A PTCA catheter comprising:
- (a) an elongated, flexible plastic, outer tubular member, said outer tubular member having three integrally formed segments, the first of said segments being of a first outer diameter, the second of said segments being of a second outer diameter less than said first outer diameter and the third segment being a transition zone between said first and said second segments, said second segment leading to the distal tip of said catheter, there being an aperture through the wall of said outer tubular member in said transition zone;
(b) an elongated, flexible plastic, inner tubular member having an outer diameter permitting said inner tubular member to be slidingly received within the lumen of said outer tubular member within said first segment, but not within said second segment, the distal end of said inner tubular member being shaped to seat in a sealing relation with the inner side wall of said outer tubular member within said transition zone; and
(c) an expander member surrounding said outer tubular member and extending from said transition zone to the distal end of said catheter, said expander member being circumferentially bonded to said outer tubular member at two spaced apart locations on either side of said aperture.
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Accused Products
Abstract
An angioplasty catheter having an outer tubular member and a coaxially aligned inner tubular member. The outer tube is of a first predetermined diameter over a majority of its length, but then tapers down, in a transition zone, to a second predetermined diameter less than the first and which extends to the catheter'"'"'s distal tip. The inner tube has a distal end shaped to mate with the inside surface of the outer tube in the transition zone to form a seal when the inner tube is advanced in the distal direction. An expander is secured to the outer tube and inflatable by perfusing a fluid in the zone between the outer and inner tubes and through ports formed through the wall of the outer tube in the transition zone. By manipulating the proximal end of the inner tube, blood or other fluids may be perfused or exasperated and made to inflate or deflate the expander, the distal end of the inner tube acting as a valve, seating with the inner surface of the outer tube in the transition zone. The inner tube may be removed completely for maximum perfusion or for replacement with a guide wire or an optical fiber when performing laser angioplasty. The hub on the proximal end of the catheter body facilitates the manipulation of the aforementioned valve and the introduction of a perfusant along the length of the catheter body.
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Citations
9 Claims
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1. A PTCA catheter comprising:
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(a) an elongated, flexible plastic, outer tubular member, said outer tubular member having three integrally formed segments, the first of said segments being of a first outer diameter, the second of said segments being of a second outer diameter less than said first outer diameter and the third segment being a transition zone between said first and said second segments, said second segment leading to the distal tip of said catheter, there being an aperture through the wall of said outer tubular member in said transition zone; (b) an elongated, flexible plastic, inner tubular member having an outer diameter permitting said inner tubular member to be slidingly received within the lumen of said outer tubular member within said first segment, but not within said second segment, the distal end of said inner tubular member being shaped to seat in a sealing relation with the inner side wall of said outer tubular member within said transition zone; and (c) an expander member surrounding said outer tubular member and extending from said transition zone to the distal end of said catheter, said expander member being circumferentially bonded to said outer tubular member at two spaced apart locations on either side of said aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification