Cutter device
First Claim
1. A cutter for use with a catheter having a torque cable, the cutter comprising:
- a body defining a cutting edge, the body adapted for attachment to the torque cable;
the body being made of a steel selected from the group consisting of 440 FSe steel and 440 C steel; and
the body defining a surface, the surface, including the cutting edge being ion implanted with a material selected from the group consisting of nitrogen and boron,whereby the cutting edge is capable of cutting calcified tissue.
3 Assignments
0 Petitions
Accused Products
Abstract
Disclosed herein is a cutter capable of removing soft and hard tissue when used with an atherectomy catheter of the type having a cutter housing attached to the distal end of a catheter having a torque cable. A circular cutting blade is disposed within the housing and is secured to the distal end of a rotatable torque cable. An elongated aperture formed along one side of the hosing allows the intrusion of stenotic material which may then be severed by rotating and axially translating the cutting blade. The cutting blade may be made from a cemented tungsten carbide compound of 90 percent tungsten carbide (WC) and 10 percent cobalt (Co) which is heated, injection molded and sintered to produce a hard, durable cutting edge. The cutting edge is coated with titanium carbonitride using a physical vapor deposition process to further increase durability. Cutting edge hardness is further increased by application of an ion implantation of nitrogen using an ion-beam assisted deposition process. A variety of alternative cutter materials, coatings and geometries are defined which improve cutter performance in removing soft and hard lesions.
316 Citations
20 Claims
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1. A cutter for use with a catheter having a torque cable, the cutter comprising:
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a body defining a cutting edge, the body adapted for attachment to the torque cable; the body being made of a steel selected from the group consisting of 440 FSe steel and 440 C steel; and the body defining a surface, the surface, including the cutting edge being ion implanted with a material selected from the group consisting of nitrogen and boron, whereby the cutting edge is capable of cutting calcified tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A carbide cutter used with a catheter device for cutting calcified and soft tissue, the cutter comprising:
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a hollow cylindrical body having a proximal end, a distal end, and a central axis extending through the body from one end to the other, the cylindrical body having a surface including an outer wall; the proximal end of the body being adapted for attachment to a cutter torque cable; the distal end of the body having a cup shaped recess, the recess being generally symmetrical about the axis, the intersection of the recess with the outer wall defining a tissue cutting edge; the cutting edge being sharpened; and the body material comprising 90% tungsten carbide (WC) and 10% cobalt (CO) and including a biocompatible coating covering a pre-determined portion of the body including the cutting edge, the coating being selected from the group consisting of titanium carbonitride and titanium nitride. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification