Patent US3799702A successfully refreshed from Google Patents.
US3799702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for draining blood from a surgical wound and transmission to a heart-lung machine
Assignee: Individual
•
Filing: 1972-11-15
•
Granted: 1974-03-26
•
Expires: 1992-11-15
Abstract
Abstract A pressure sensor is connected to the suction tube of an apparatus for draining blood from a wound and supplying it to a heart-lung machine. Means, which may be either a separate pump or the pump connected to the tube for pumping blood, forms an underpressure generator. The pressure sensor is responsive to a first underpressure in the tube for increasing the pumping action of the suction pump motor, and to ambient pressure for decreasing the pumping action of the pump motor. The sensor may also be responsive to a greater underpressure for stopping or reversing the motor.
Inventors
- 👤 E Weishaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:08
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/12; F04B43/1253; F04B43/1292; A; A61; A61M; A61M1/00; A61M1/71; A61M1/74; F04B49/00; F04B49/02; F04B49/022; F04B49/08; A61M1/75
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
155 words
An apparatus for draining blood from a surgical wound and transporting this blood to a heart-lung machine by means of a suction tube connected to a suction pump; said apparatus comprising weakly acting underpressure generator means, a pressure sensor, means for connecting said suction tube to said underpressure generator means and to said pressure sensor, means for connecting said pressure sensor to said pump for controlling the latter, said pressure sensor being further responsive to a predetermined first underpressure threshold value due to a rise of the blood level above the mouth of the tube for gradually starting up the suction pump, said pressure sensor being responsive to a second higher underpressure value for turning off the suction pump and transmitting atmospheric pressure to the suction tube, said pressure sensor being further responsive to the disappearance of the underpressure due to the blood level dropping below the suction tube mouth for shutting the pump off.
Claim 2
Independent Claim
155 words
An apparatus for draining blood from a surgical wound and transporting this blood to a heart-lung machine by means of a suction tube connected to a suction pump; said apparatus comprising weakly acting underpressure generator means, a pressure sensor, means for connecting said suction tube to said underpressure generator means and to said pressure sensor, means for connecting said pressure sensor to said pump for controlling the latter, said pressure sensor being further responsive to a predetermined first underpressure threshold value due to a rise of the blood level above the mouth of the tube for gradually starting up the suction pump, said pressure sensor being responsive to a second higher underpressure value for turning off the suction pump and transmitting atmospheric pressure to the suction tube, said pressure sensor being further responsive to the disappearance of the underpressure due to the blood level dropping below the suction tube mouth for shutting the pump off.
Claim 3
Dependent Claim
24 words
The apparatus according to claim 1, wherein said underpressure generator means comprises said suction pump, being automatically set to low operating mode of operation.
Claim 4
Dependent Claim
45 words
The apparatus according to claim 1, comprising a valve for connecting said suction tube to ambient, atmospheric pressure and means for connecting said valve to said pressure sensor for opening the valve in response to the occurence in said tube of a second underpressure value.
Claim 5
Dependent Claim
35 words
The apparatus according to claim 1, comprising means for reversing said suction pump whereby it starts gradually to produce temporarily positive instead of negative pressure and whereby atmospheric pressure is supplied to said suction tube.
Claim 6
Dependent Claim
106 words
In an apparatus for draining blood from a wound and supplying it to a heart-lung machine, wherein the apparatus includes a suction tube, a pump connected to the suction tube, and a motor connected to operate the pump, the improvement comprising pressure sensing means connected to sense pressure in said tube for controlling said motor, said pressure sensor being responsive to a first underpressure for controlling said motor to increase the pumping action of said pump, said pressure sensor further being responsive to ambient pressure for controlling said motor to decrease the pumping action of said pump, and means for producing an underpressure in said tube.
Claim 7
Dependent Claim
106 words
In an apparatus for draining blood from a wound and supplying it to a heart-lung machine, wherein the apparatus includes a suction tube, a pump connected to the suction tube, and a motor connected to operate the pump, the improvement comprising pressure sensing means connected to sense pressure in said tube for controlling said motor, said pressure sensor being responsive to a first underpressure for controlling said motor to increase the pumping action of said pump, said pressure sensor further being responsive to ambient pressure for controlling said motor to decrease the pumping action of said pump, and means for producing an underpressure in said tube.
Claim 8
Dependent Claim
16 words
The apparatus according to claim 5, wherein said means for producing an underpressure comprises said pump.
Claim 9
Dependent Claim
21 words
The apparatus according to claim 5, wherein said means for producing an underpressure comprises a second pump connected to said tube.
Claim 10
Dependent Claim
94 words
An automatic system for draining fluids comprising a suction tube, a pump connected to said tube, a motor connected to opeRate said pump, a pressure sensor connected to control said motor in response to the pressure in said tube, and underpressure generating means for reducing pressure in said tube, said pressure sensor being responsive to a first underpressure for controlling said motor to increase the pumping action of said pump, said pressure sensor being further responsive to ambient pressure in said tube for controlling said motor to decrease the pumping action of said pump.
Claim 11
Dependent Claim
94 words
An automatic system for draining fluids comprising a suction tube, a pump connected to said tube, a motor connected to opeRate said pump, a pressure sensor connected to control said motor in response to the pressure in said tube, and underpressure generating means for reducing pressure in said tube, said pressure sensor being responsive to a first underpressure for controlling said motor to increase the pumping action of said pump, said pressure sensor being further responsive to ambient pressure in said tube for controlling said motor to decrease the pumping action of said pump.
Claim 12
Dependent Claim
36 words
The system according to claim 8, wherein said pressure sensor is responsive to an underpressure in said tube greater then said first mentioned underpressure for controlling said motor to reverse the pumping action of said pump.
References Cited (Backward Citations)
US3457865A
Cited
US3565076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |