US3776239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aspirator needle
Assignee: Sherwood Medical Co
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Filing: 1972-05-17
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Granted: 1973-12-04
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Expires: 1992-05-17
Abstract
Abstract An aspirator needle for use in open-heart surgery during cardiopulmonary bypass to reduce the risk of air entrapment in the aorta. The needle consists of a cannula provided with a pointed end and an axial slot in the wall thereof extending substantially the length of the cannula, and a hub configured to connect to a source of suction via a connecting tube.
Inventors
- 👤 D Cooley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:11
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3417; A61M; A61M25/00; A61M25/01; A61M25/0105; A61M25/0108
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
233 words
An aspirator needle for insertion into a body vessel comprising a needle cannula having a pointed distal end, and a hub connected to a proximal portion of said cannula and having a distal end face, said cannula having a free portion extending axially from said end face for a distance less than the diameter of the body vessel to prevent penetration of the opposed wall of the body vessel when the aspirator needle is inserted with said end face substantially engaging the exterior of the body vessel, said free portion having an axially elongate slot extending through the wall of said cannula with the proximal end of said slot spaced from said end face to define therebetween an unslotted portion and to define a slotted portion between tbe proximal end of said slot and the distal end of said cannula, said unslotted portion being substantially smaller in axial length than said slotted portion so that when the aspirator needle is inserted into the body vessel substantially up to said end face, the proximal end of said slot is closely adjacent the interior of the body vessel wall so that air bubbles within the body vessel adjacent the interior of the body vessel wall can enter said slot, said hub having a bore therein in fluid communication with said cannula and means thereon for receiving a flexible tube in fluid communication with said bore.
Claim 2
Dependent Claim
233 words
An aspirator needle for insertion into a body vessel comprising a needle cannula having a pointed distal end, and a hub connected to a proximal portion of said cannula and having a distal end face, said cannula having a free portion extending axially from said end face for a distance less than the diameter of the body vessel to prevent penetration of the opposed wall of the body vessel when the aspirator needle is inserted with said end face substantially engaging the exterior of the body vessel, said free portion having an axially elongate slot extending through the wall of said cannula with the proximal end of said slot spaced from said end face to define therebetween an unslotted portion and to define a slotted portion between tbe proximal end of said slot and the distal end of said cannula, said unslotted portion being substantially smaller in axial length than said slotted portion so that when the aspirator needle is inserted into the body vessel substantially up to said end face, the proximal end of said slot is closely adjacent the interior of the body vessel wall so that air bubbles within the body vessel adjacent the interior of the body vessel wall can enter said slot, said hub having a bore therein in fluid communication with said cannula and means thereon for receiving a flexible tube in fluid communication with said bore.
Claim 3
Dependent Claim
27 words
The aspirator needle set forth in claim 1 wherein said slot extends continuously from the proximal end of said slot to the distal end of said cannula.
Claim 4
Dependent Claim
30 words
The aspirator needle set forth in claim 1 wherein said unslotted portion is cylindrical and has an axial length approximately equal to the average thickness of the body vessel wall.
Claim 5
Dependent Claim
27 words
The aspirator needle set forth in claim 3 wherein said slot extends continuously from the proximal end of said slot to the distal end of said cannula.
Claim 6
Dependent Claim
32 words
The aspirator needle set forth in claim 1 wherein the axial length of said unslotted portion is approximately .078 inch and the axial length of said slotted portion iS approximately .422 inch.
Claim 7
Dependent Claim
27 words
The aspirator needle set forth in claim 5 wherein said slot extends continuously from the proximal end of said slot to the distal end of said cannula.
Claim 8
Dependent Claim
29 words
The aspirator needle set forth in claim 1 wherein the axial length of said hub is at least two times the length of said free portion of said cannula.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |