Patent US2291150A successfully refreshed from Google Patents.
Patent US3570498A successfully refreshed from Google Patents.
US3570498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trocar and cannula for veterinary use
Assignee: Individual
•
Filing: 1970-03-09
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Granted: 1971-03-16
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Expires: 1990-03-09
Abstract
Abstract A veterinary instrument having a trocar with a curved end and a cannula with its end curved to lie within the trocar during insertion, the cannula being rotatable with respect to the trocar to open out the curved ends after insertion and thereby lock the instrument in position. The parts are held in the closed and open conditions by a pin and slot connection and a biassing spring. A disc can be adjusted to bear against the animal''s skin and thus secure the instrument more firmly.
Inventors
- 👤 Charles Weighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3415
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A veterinary instrument comprising: a cannula having a tubular straight portion and a tubular curved end portion; a trocar having a tubular portion within which the tubular straight portion of said cannula is rotatably received and a curved end portion having a concave inner surface adapted to fit over one side of the curved end portion of said cannula, said end portion having a pointed tip; means for rotating said cannula between a first position in which its curved end portion is fitted within the curved end portion of said trocar and a second position in which its curved end portion is outside of and at an angle to the curved end portion of said trocar whereby said instrument may be anchored in position after insertion; and an opening in the sidewall of said cannula substantially in alignment with the straight portion of said cannula.
Claim 2
Dependent Claim
145 words
A veterinary instrument comprising: a cannula having a tubular straight portion and a tubular curved end portion; a trocar having a tubular portion within which the tubular straight portion of said cannula is rotatably received and a curved end portion having a concave inner surface adapted to fit over one side of the curved end portion of said cannula, said end portion having a pointed tip; means for rotating said cannula between a first position in which its curved end portion is fitted within the curved end portion of said trocar and a second position in which its curved end portion is outside of and at an angle to the curved end portion of said trocar whereby said instrument may be anchored in position after insertion; and an opening in the sidewall of said cannula substantially in alignment with the straight portion of said cannula.
Claim 3
Dependent Claim
24 words
An instrument as claimed in claim 1 including means for locking said cannula and trocar against relative rotation in either of said two positions.
Claim 4
Dependent Claim
20 words
An instrument as claimed in claim 2 comprising spring means for holding said cannula and trocar in the locked positions.
Claim 5
Dependent Claim
26 words
An instrument as claimed in claim 3 including a pin and slot connection between said cannula and said trocar, said slot having angularly spaced locking portions.
Claim 6
Dependent Claim
21 words
An instrument as claimed in claim 1 including a disc displaceable along said trocar to assist the anchorage of the instrument.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |