US3807401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticoagulating blood suction device
Assignee: DEPARTMENT OF HEALTH EDUCATION
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Filing: 1972-06-21
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Granted: 1974-04-30
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Expires: 1992-06-21
Abstract
Abstract An anticoagulating blood suction device for use in intraoperative autotransfusion operations which removes pools of blood and simultaneously draws a controlled amount of anticoagulant into the stream of blood by means of a metering orifice designed on the Venturi principle. The prescribed amount of anticoagulant is mixed with the volume of blood removed from the wound regardless of blood volume variations per unit of time.
Inventors
- 👤 S Bennett
- 👤 G Riggle
- 👤 R Hoye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:44
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3672; A61M1/84; A61M1/85; A61M1/71; A61M1/74; A61M1/741; A61M1/7411; A61M2202/00; A61M2202/04; A61M2202/0413; Y; Y10; Y10S; Y10S604/00; Y10S604/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
An anticoagulating blood suction device comprising: a tube; a suction tip at one end of said tube; vacuum means for creating a partial vacuum in said tube connected thereto at the end remote from said suction tip; and metering means within said tube for drawing anticoagulant into said tube at a rate proportionate to the flow rate of blood passing said metering means, wherein said metering means comprises a venturi element with a passageway therein narrowing to a neck and then widening again to the inner diameter of said tube; and a chamber connected to said tube in the area of said venturi element for maintaining anticoagulant therein; said venturi having an orifice therethroUgh in the area of said neck communicating with said chamber whereby the pressure decrease caused by the passage of blood past said neck in said venturi element will draw anticoagulant through said orifice in an amount proportionate to the flow rate of the bood.
Claim 2
Dependent Claim
158 words
An anticoagulating blood suction device comprising: a tube; a suction tip at one end of said tube; vacuum means for creating a partial vacuum in said tube connected thereto at the end remote from said suction tip; and metering means within said tube for drawing anticoagulant into said tube at a rate proportionate to the flow rate of blood passing said metering means, wherein said metering means comprises a venturi element with a passageway therein narrowing to a neck and then widening again to the inner diameter of said tube; and a chamber connected to said tube in the area of said venturi element for maintaining anticoagulant therein; said venturi having an orifice therethroUgh in the area of said neck communicating with said chamber whereby the pressure decrease caused by the passage of blood past said neck in said venturi element will draw anticoagulant through said orifice in an amount proportionate to the flow rate of the bood.
Claim 3
Dependent Claim
68 words
An anticoagulating blood suction device in accordance with claim 1, further including: a second tube surrounding said first mentioned tube and coaxial therewith, said chamber for anticoagulant being defined by the annular space between said first mentioned tube and said second tube; and a metering hole in said tube in the area of said orifice for permitting the flow of anticoagulant from said chamber to said venturi element.
Claim 4
Dependent Claim
30 words
An anticoagulating blood suction device in accordance with claim 1 further including: a housing means connected to said suction tip for preventing pieces of solid material from entering said tube.
Claim 5
Dependent Claim
20 words
An anticoagulating blood suction device in accordance with claim 3 wherein: said housing means includes a screen of perforated metal.
Claim 6
Dependent Claim
28 words
An anticoagulating blood suction device in accordance with claim 1 wherein: all of the surfaces of the device which come in contact with blood are silicon resin coated.
Claim 7
Dependent Claim
44 words
An anticoagulating blood suction device in accordance with claim 1, further including: air vent means comprising a vent through said tube located between said metering means and said suction tip for preventing aspiration from said suction tip when open and permitting aspiration when closed.
References Cited (Backward Citations)
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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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |