US4887613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter for atherectomy device
Assignee: InterVentional Technologies Inc
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Filing: 1988-06-30
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Granted: 1989-12-19
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Expires: 2008-06-30
Abstract
Abstract A cutter penetrates at its forward end into, and excises, obstructive tissue in a lumen in a living being by providing two spaced external segments of a conical generally hollow portion with cutting surfaces at their edges. The cutter may have a forward portion of restricted dimensions to facilitate the penetration of the cutter into the obstructive tissue. A progressively expanding portion such as a truncated cone extends rearwardly from the portion of restricted dimensions. In this way, the cutter expands the area of excision of the obstructive tissue from the lumen wall at progressive positions rearwardly from the forward end. The obstructive tissue in the lumen at the progressively expanding positions may be excised at the positions of penetration of the obstructive tissue by rotating the cutter manually or by a motor. The cutter may then be moved forwardly to penetrate the obstructive tissue through an additional distance in the lumen. The cutter may also have a hollow portion of substantially constant dimensions, such as a hollow cylinder, at the laterally expanded end. This hollow cylinder is coupled to a torque tube which has strong and resilient properties to follow the contour of the lumen and to communicate a penetrating force to the forward end of the cutter and a torque to the cutter to rotate the cutter. A vacuum may be applied to the cutter through the torque tube to remove fragments of obstructive tissue excised from the lumen.
Inventors
- 👤 Andrew F. Farr
- 👤 Herbert R. Radisch, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:58
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3205; A61B17/3207; A61B17/320758
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
193 words
A rotatable cutter for excising obstructive tissue from a lumen of a blood vessel which comprises: a hollow cylindrical base; a hollow cylindrical tip coaxially distanced from said base and having a diameter less than that of said base; a hollow frustum coaxially aligned intermediate and respectively attached to said base and said tip, said frustum formed with a first opening and a second opening to establish a rigid first blade and a rigid second blade, said first and second blades respectively having a first cutting edge and a second cutting edge substantially diametrically opposed to said first cutting edge and wherein said first opening is larger than said second opening to establish said first edge longer than said second edge; a guide wire insertable through said base and said tip for guiding said cutter along a predetermined path; and means fixedly attached to said base for rotating said cutting edges of said cutter in the same rotational direction to alternately engage said first and second edges with obstructive tissue and establish a differential cutting action between said edges to incline the axis of rotation of said cutter relative to said guide wire.
Claim 2
Dependent Claim
193 words
A rotatable cutter for excising obstructive tissue from a lumen of a blood vessel which comprises: a hollow cylindrical base; a hollow cylindrical tip coaxially distanced from said base and having a diameter less than that of said base; a hollow frustum coaxially aligned intermediate and respectively attached to said base and said tip, said frustum formed with a first opening and a second opening to establish a rigid first blade and a rigid second blade, said first and second blades respectively having a first cutting edge and a second cutting edge substantially diametrically opposed to said first cutting edge and wherein said first opening is larger than said second opening to establish said first edge longer than said second edge; a guide wire insertable through said base and said tip for guiding said cutter along a predetermined path; and means fixedly attached to said base for rotating said cutting edges of said cutter in the same rotational direction to alternately engage said first and second edges with obstructive tissue and establish a differential cutting action between said edges to incline the axis of rotation of said cutter relative to said guide wire.
Claim 3
Dependent Claim
17 words
A rotatable cutter as recited in claim 1 wherein said first and second cutting edges are straight.
Claim 4
Dependent Claim
36 words
A rotatable cutter as cited in claim 2 wherein said first blade and said second blade are inclined to the longitudinal axis of said cutter at an angle in the range between forty and seventy degrees.
Claim 5
Dependent Claim
16 words
A rotatable cutter as cited in claim 3 wherein said cutter is made of stainless steel.
Claim 6
Dependent Claim
160 words
A rotatable cutter for excising obstructive tissue from a lumen of a blood vessel which comprises: a hollow cylindrical-shaped base; a hollow cylindrical-shaped tip coaxially distanced from said base and having a diameter less than that of said base; a first rigid blade connecting said base to said tip to establish a first leading cutting edge therebetween; a second rigid blade connecting said base to said tip to establish a second leading cutting edge therebetween, said second leading cutting edge being longer than said first leading cutting edge; a guide wire insertable through said base and said tip for guiding said cutter along a predetermined path; and means fixedly attached to said base for rotating said cutting edges of said cutter in the same rotational direction to alternately engage said first and second edges with obstructive tissue and establish a differential cutting action between said edges to incline the axis of rotation of said cutter relative to said guide wire.
Claim 7
Dependent Claim
160 words
A rotatable cutter for excising obstructive tissue from a lumen of a blood vessel which comprises: a hollow cylindrical-shaped base; a hollow cylindrical-shaped tip coaxially distanced from said base and having a diameter less than that of said base; a first rigid blade connecting said base to said tip to establish a first leading cutting edge therebetween; a second rigid blade connecting said base to said tip to establish a second leading cutting edge therebetween, said second leading cutting edge being longer than said first leading cutting edge; a guide wire insertable through said base and said tip for guiding said cutter along a predetermined path; and means fixedly attached to said base for rotating said cutting edges of said cutter in the same rotational direction to alternately engage said first and second edges with obstructive tissue and establish a differential cutting action between said edges to incline the axis of rotation of said cutter relative to said guide wire.
Claim 8
Dependent Claim
19 words
A rotatable cutter as cited in claim 5 wherein said first blade and said second blade are substantially straight.
Claim 9
Dependent Claim
40 words
A rotatable cutter as cited in claim 6 wherein said first blade and said second blade are each inclined to the common axis of said tip and said base at an angle in the range between forty and seventy degrees.
Claim 10
Dependent Claim
16 words
A rotatable cutter as cited in claim 7 wherein said base and said tip are hollow.
Claim 11
Dependent Claim
16 words
A rotatable cutter as cited in claim 8 wherein said cutter is made of stainless steel.
Claim 12
Dependent Claim
39 words
A rotatable cutter as recited in claim 5 further comprising a motor, and wherein said rotating means is a torque tube having a first end attached to said base and having a second end operatively engaged with said motor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |