Patent US3788119A successfully refreshed from Google Patents.
US3788119A
Expired / Lapsed
US
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Method of forming spinal needle
Assignee: OMNIS SURGICAL Inc A DE CORP
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Filing: 1972-08-17
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Granted: 1974-01-29
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Expires: 1992-08-17
Abstract
Abstract The present application discloses a procedure for forming a beveled tip on a needle assembly including a cannula and an obturator. The assembly is subjected to a swaging or drawing operation for drawing the cannula inner wall into substantial contact with the obturator thereby to frictionally immobilize the latter. In this condition the assembly is provided with a tip. Tipping results in the reduction of gripping friction so that the obturator may be released. The procedure provides an assembly having no appreciable clearance or mismatch between cannula and obturator thereby to substantially reduce incidence of coring of tissue being punctured.
Inventors
- 👤 A Arrigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:41
CPC Classifications
B; B21; B21G; B21G1/00; B21G1/08; A; A61; A61B; A61B17/00; A61B17/34; A61B17/3401
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A method for forming a beveled tip on a needle assembly including at least a needle cannula and an obturator capable of receipt and positioning within as well as removal from the lumen of the cannula which comprises the steps of introducing and moving said obturator within said cannula to an operative position, drawing down, for a portion of the length of a tip end, the cannula wall into substantial contact with said obturator to thereby immobilize said obturator in said cannula, and then, while said obturator is immobilized in said cannula, forming a beveled tip on said cannula and said obturator simultaneously whereby after said forming operation both tips lie within a plane.
Claim 2
Independent Claim
114 words
A method for forming a beveled tip on a needle assembly including at least a needle cannula and an obturator capable of receipt and positioning within as well as removal from the lumen of the cannula which comprises the steps of introducing and moving said obturator within said cannula to an operative position, drawing down, for a portion of the length of a tip end, the cannula wall into substantial contact with said obturator to thereby immobilize said obturator in said cannula, and then, while said obturator is immobilized in said cannula, forming a beveled tip on said cannula and said obturator simultaneously whereby after said forming operation both tips lie within a plane.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said beveled tip is formed by grinding.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said cannula and obturator are passed within a die and said beveled tip is formed by shearing.
Claim 5
Dependent Claim
19 words
The method of claim 1 including the step of forming a second point throughout a portion of said tip.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein said portion of the length of said tip End is 3/16 inch or less.
References Cited (Backward Citations)
US1591021A
Cited
GB687597A
Cited
US2919692A
Cited
US3308822A
Cited
US3540447A
Cited
US3585986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |