US5507760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter device
Assignee: Abbott Cardiovascular Systems Inc
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Filing: 1993-11-09
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Granted: 1996-04-16
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Expires: 2013-11-09
Abstract
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.
Inventors
- 👤 Robert L. Wynne
- 👤 David W. Snow
- 👤 Larry B. Rogers
- 👤 Ferolyn Powell
- 👤 Jeffrey W. Krier
- 👤 Ron Hundertmark
- 👤 Earl R. Hill, III
- 👤 Randolph E. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:10
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3205; A61B17/3207; A61B17/320783; A61B17/320016; A61B17/32002; A61B2017/00831; A61B2017/320004
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
86 words
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.
Claim 2
Dependent Claim
86 words
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.
Claim 3
Dependent Claim
11 words
The cutter of claims 1, wherein the cutting edge is sharpened.
Claim 4
Dependent Claim
14 words
The cutter of claims 1, wherein the cutting edge is hardened by heat treating.
Claim 5
Dependent Claim
17 words
The cutter of claims 1, wherein the cutting edge is hardened by heat treating and is sharpened.
Claim 6
Dependent Claim
54 words
The cutter of claim 1, wherein the body is cylindrical, has a proximal end and a distal end, has an axis extending between the ends, and wherein the distal end includes a cup shaped recess, the recess being generally symmetrical about the axis, and wherein the body defines a surface having an outer wall.
Claim 7
Dependent Claim
54 words
The cutter of claim 1, wherein the body is cylindrical, has a proximal end and a distal end, has an axis extending between the ends, and wherein the distal end includes a cup shaped recess, the recess being generally symmetrical about the axis, and wherein the body defines a surface having an outer wall.
Claim 8
Dependent Claim
51 words
The cutter of claim 1, wherein the body is cylindrical, has a proximal end and a distal end, has an axis extending between the ends, and wherein the distal end includes a cup shaped recess, the recess being generally symmetrical about the axis, and wherein the surface includes an outer wall.
Claim 9
Dependent Claim
18 words
The cutter of claims 5, 6 or 7, wherein the cylindrical body includes an axial bore extending therethrough.
Claim 10
Dependent Claim
35 words
The cutter of claims 5, 6 or 7, wherein the cup shaped recess intersects the outer wall and wherein the cutting edge is further defined by the intersection of the recess with the outer wall.
Claim 11
Dependent Claim
14 words
The cutter of claim 9, wherein the cutting edge is a single arcuate edge.
Claim 12
Dependent Claim
48 words
The cutter of claim 6, wherein the cup shaped recess has an abrasive coating and wherein the cutting edge has a lubricating and hardening coating selected from the group consisting of diamond-like carbon, alumina, titanium nitride, titanium carbonitride, zirconium nitride, boron nitride, cubic boron nitride and high chromium-composites.
Claim 13
Dependent Claim
22 words
The cutter of claim 11, wherein the abrasive coating is polycrystalline diamond and wherein the cutting edge is coated with titanium nitride.
Claim 14
Dependent Claim
36 words
The cutter of claim 12, further including the outer wall having a coating selected from the group consisting of diamond-like carbon, alumina, titanium nitride, titanium carbonitride, zirconium nitride, boron nitride, cubic boron nitride and high chromium-composites.
Claim 15
Dependent Claim
148 words
A carbide cutter used with a catheter device for cutting calcified and soft tissue, the cutter comprising: 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.
Claim 16
Dependent Claim
148 words
A carbide cutter used with a catheter device for cutting calcified and soft tissue, the cutter comprising: 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.
Claim 17
Dependent Claim
23 words
The carbide cutter of claim 14, further including a predetermined portion of the surface, including the cutting edge, being ion implanted with nitrogen.
Claim 18
Dependent Claim
25 words
The carbide cutter of claim 14, further including means for increasing the hardness of the cutting edge to improve removal of calcified and non-calcified tissue.
Claim 19
Dependent Claim
28 words
The carbide cutter of claim 16, wherein the the cutting edge has a coating with a material selected from the group consisting of titanium carbonitride and titanium nitride.
Claim 20
Dependent Claim
14 words
The carbide cutter of claim 17, wherein the coated cutting edge implanted with nitrogen.
Claim 21
Dependent Claim
32 words
The carbide cutter of claim 14, further including means for increasing the durability of the cutting edge to minimize the potential for fragmentation of the cutting edge during removal of calcified tissue.
Claim 22
Dependent Claim
31 words
The carbide cutter of claim 19, wherein the means for increasing durability includes coating the cutting edge with a material selected from the group consisting of titanium carbonitride and titanium nitride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-16 | 1999-10-16 | 2000-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-16 | 2003-10-16 | 2004-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-16 | 2007-10-16 | 2008-04-16 | $7700.00 | Window Closed / Lapsed |