US4128351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sternotomy surgical needle
Assignee: Deknatel Technology Corp
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Filing: 1977-04-15
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Granted: 1978-12-05
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Expires: 1997-04-15
Abstract
Abstract An improved surgical needle of the type having a simple main cutting edge extending across the needle and formed by the intersection of two planar surfaces for use in cutting through hard body tissue material. The forward end of the needle includes a relatively small third substantially planar surface having an acute angle of convergence with the axis of the needle and intersecting at substantially equal acute angles with the other two planar surfaces. The surgical needle is preferably curved in the reference plane defined by the main cutting edge and the axis of the needle. Such an improved surgical needle results in an extremely sharp needle with a high resistance to burring.
Inventors
- 👤 Leonard D. Kurtz
- 👤 Philip Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:23
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/04; A61B17/06; A61B17/06066
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A surgical instrument comprising a body portion and a cutting portion, a pair of intersecting first and second planar surfaces forming a single main cutting edge extending from one side of the cutting portion of the instrument to a point at the end of the instrument, a third planar surface having an acute angle of convergence with the longitudinal axis of the instrument and extending from the opposite side of the cutting portion of the instrument to the point thereof, secondary cutting edges formed by the intersection of the third planar surface with said pair of first and second planar surfaces, the point at the end of the instrument being on the single main cutting edge so that the end portions of both the main and secondary cutting edges extend to the end point of the instrument.
Claim 2
Dependent Claim
137 words
A surgical instrument comprising a body portion and a cutting portion, a pair of intersecting first and second planar surfaces forming a single main cutting edge extending from one side of the cutting portion of the instrument to a point at the end of the instrument, a third planar surface having an acute angle of convergence with the longitudinal axis of the instrument and extending from the opposite side of the cutting portion of the instrument to the point thereof, secondary cutting edges formed by the intersection of the third planar surface with said pair of first and second planar surfaces, the point at the end of the instrument being on the single main cutting edge so that the end portions of both the main and secondary cutting edges extend to the end point of the instrument.
Claim 3
Dependent Claim
27 words
A surgical insstrument as claimed in claim 1 wherein said surgical instrument is curved in the reference plane defined by said main cutting edge and said axis.
Claim 4
Dependent Claim
21 words
A surgical instrument as claimed in claim 1 wherein said main cutting edge forms an acute angle with said third surface.
Claim 5
Dependent Claim
30 words
A surgical instrument as claimed in claim 1 wherein the angle of convergence between said third planar surface and said axis is within the range of 20° to 35°, inclusive.
Claim 6
Dependent Claim
22 words
A surgical instrument as claimed in claim 4 wherein the angle of slope of said main cutting edge is less than 20°.
Claim 7
Dependent Claim
34 words
A surgical instrument as claimed in claim 5 wherein said first and second planar surfaces form at said main cutting edge a sharpness angle that is within the range of 40° to 50°, inclusive.
Claim 8
Dependent Claim
30 words
A surgical instrument as claimed in claim 6 wherein said angle of slope is approximately 18°, said sharpness angle is approximately 43° and said angle of convergence is approximately 30°.
Claim 9
Dependent Claim
22 words
A surgical instrument as claimed in claim 1 wherein said third surface forms corresponding acute angles with said first and second surfaces.
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) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |