Cutting balloon catheter with improved pushability
First Claim
1. A rapid exchange catheter comprising:
- an elongated shaft having proximal and distal ends, the elongated shaft including;
a hypotube having a proximal end and a distal end;
a first midshaft portion including a braided member having a proximal end and a distal end, the first midshaft portion being attached near its proximal end to a location near the distal end of the hypotube;
a second midshaft portion having a proximal end, a distal end, and a guidewire entry port, the second midshaft portion being attached near its proximal end to a location near the distal end of the first midshaft portion; and
a distal portion defining a short guidewire lumen and an inflation lumen, the distal portion being attached to the second midshaft portion and extending distally therefrom; and
a balloon disposed near the distal end of the elongated shaft, the balloon including one or more cutting blades adapted for cutting an occlusion.
2 Assignments
0 Petitions
Accused Products
Abstract
Rapid exchange angioplasty catheters and methods of constructing rapid exchange angioplasty catheters including features that provide good pushability and kink resistance. In an illustrative embodiment, a catheter is provided, the illustrative catheter including a proximal hypotube section, which connects to a more distal braided catheter section. The braided catheter section connects to a midshaft portion that includes a guidewire entry port. Distal of the midshaft portion is a distal section having a cutting balloon disposed thereon. An inflation lumen extends the length of the catheter, while a guidewire lumen extends only from the guidewire entry port to the distal end of the catheter. Optionally, a core wire may extend across the joint from the hypotube, to the braided catheter section, and past the guidewire entry port.
147 Citations
20 Claims
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1. A rapid exchange catheter comprising:
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an elongated shaft having proximal and distal ends, the elongated shaft including;
a hypotube having a proximal end and a distal end;
a first midshaft portion including a braided member having a proximal end and a distal end, the first midshaft portion being attached near its proximal end to a location near the distal end of the hypotube;
a second midshaft portion having a proximal end, a distal end, and a guidewire entry port, the second midshaft portion being attached near its proximal end to a location near the distal end of the first midshaft portion; and
a distal portion defining a short guidewire lumen and an inflation lumen, the distal portion being attached to the second midshaft portion and extending distally therefrom; and
a balloon disposed near the distal end of the elongated shaft, the balloon including one or more cutting blades adapted for cutting an occlusion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A rapid exchange catheter comprising:
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an elongated shaft having proximal and distal ends, the elongated shaft including;
a hypotube having a proximal end and a distal end;
a first midshaft member having a braided construction with a proximal end and a distal end, the first midshaft member being attached near its proximal end to a location near the distal end of the hypotube, the first midshaft member including a lubricious inner layer, a braided member disposed about the lubricious inner layer, and a polymeric outer layer placed over the braided member;
a second midshaft portion having a proximal end, a distal end, and a guidewire entry port, the second midshaft portion being attached near its proximal end to a location near the distal end of the first midshaft portion;
a distal portion defining a short guidewire lumen and an inflation lumen, the distal portion being attached to the second midshaft portion and extending distally therefrom; and
a tapered core wire attached to the hypotube and extending distally of the distal end of the hypotube, across the location at which the proximal end of the first midshaft portion is attached to the distal end of the hypotube, and past the guidewire entry port; and
a balloon disposed near the distal end of the elongated shaft, the balloon including one or more cutting blades adapted for cutting an occlusion. - View Dependent Claims (17, 18)
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19. A method of manufacturing a rapid exchange catheter having a proximal end and a distal end, a proximal hypotube section, and a distal guidewire port a substantial distance from the proximal end of the catheter, the method comprising:
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providing a core wire inside the catheter and crossing the distal guidewire port for providing support across the distal guidewire port; and
attaching a braided catheter section having a proximal end and a distal end to the distal end of the hypotube to provide kink resistance and pushability distal of the hypotube;
wherein the braided catheter section is provided proximally of the distal guidewire port. - View Dependent Claims (20)
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Specification