US3730180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatically operated ventilator
Assignee: MSA Safety Inc
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Filing: 1970-10-21
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Granted: 1973-05-01
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Expires: 1990-10-21
Abstract
Abstract A pneumatically operated pump is connected with a conduit for supplying a gas to a patient''s lungs. A first fluidic control element and a pneumatic timer control means for delivering air under pressure to the pump for operating it. The fluidic control element is controlled by a second fluidic control element, which in turn is controlled by a third fluidic control element. The latter is controlled by the movement of the pump during lung inflation to reverse the pump in order to allow exhalation. The second control element also controls an exhalation valve. Other elements provide for periodic longer inhalation periods, excess pressure release and sudden inhalation.
Inventors
- 👤 E Davison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:23
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0003; A61M16/0009; A61M16/0012; A61M16/0057; A61M16/0075; A61M16/10; A61M16/105; A61M16/106; A61M16/107; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/212; Y10T137/2125; Y10T137/2147
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
441 words
A ventilator comprising a conduit for supplying a gas to a patient''s s lungs, a pneumatically operated pump having a rapid suction stroke and a pressure stroke for alternately drawing in a charge of a gas and then forcing it out through said conduit, means for delivering air under pressure to the pump for operating it, pneumatically operated control means shiftable back and forth between two positions for controlling said delivery of air, means restricting flow of said air from said control means in only one Of said positions to admit operating air to the pump slowly to produce a slow pressure stroke, means for supplying control air to said control means for the shifting thereof, a first fluidic control element controlling the supply of control air to said control means, a pneumatically operated timer, a second fluidic control element having an outlet for delivering control air to the first fluidic control element to cause it to shift said control means to connect said air delivering means with the pump to produce the rapid suction stroke of the pump, a first air line for also delivering air from said outlet to the timer to start it operating, a second air line adapted to be opened by the timer when the timer times out, said second air line being connected to the first fluidic control element to cause said first element to shift said control means to connect said air delivering means with the pump to produce the slow pressure stroke of the pump, a normally inoperative third fluidic control element having a power outlet, means controlled by the movement of the pump at the end of its pressure stroke for rendering the third fluidic control element operative, a third air line for delivering control air from said power outlet to said second fluidic control element to cause air to issue from said outlet of said second element, an exhalation valve connected with said conduit and having a closed position and an open position and normally being in one of said positions, means operatively connecting said second fluidic control element with said valve for shifting the valve to its other position, a venturi in series with the exhalation valve and having an inlet for communication with the patient''s lungs, the venturi being provided with a power jet, a normally closed valve connected with said jet, means for supplYing air under pressure to the jet when said normally closed valve is opened to thereby withdraw gas from a patient''s lungs, and a fluidic control element controlled by said second control element for opening said normally closed valve while the exhalation valve is open.
Claim 2
Dependent Claim
441 words
A ventilator comprising a conduit for supplying a gas to a patient''s s lungs, a pneumatically operated pump having a rapid suction stroke and a pressure stroke for alternately drawing in a charge of a gas and then forcing it out through said conduit, means for delivering air under pressure to the pump for operating it, pneumatically operated control means shiftable back and forth between two positions for controlling said delivery of air, means restricting flow of said air from said control means in only one Of said positions to admit operating air to the pump slowly to produce a slow pressure stroke, means for supplying control air to said control means for the shifting thereof, a first fluidic control element controlling the supply of control air to said control means, a pneumatically operated timer, a second fluidic control element having an outlet for delivering control air to the first fluidic control element to cause it to shift said control means to connect said air delivering means with the pump to produce the rapid suction stroke of the pump, a first air line for also delivering air from said outlet to the timer to start it operating, a second air line adapted to be opened by the timer when the timer times out, said second air line being connected to the first fluidic control element to cause said first element to shift said control means to connect said air delivering means with the pump to produce the slow pressure stroke of the pump, a normally inoperative third fluidic control element having a power outlet, means controlled by the movement of the pump at the end of its pressure stroke for rendering the third fluidic control element operative, a third air line for delivering control air from said power outlet to said second fluidic control element to cause air to issue from said outlet of said second element, an exhalation valve connected with said conduit and having a closed position and an open position and normally being in one of said positions, means operatively connecting said second fluidic control element with said valve for shifting the valve to its other position, a venturi in series with the exhalation valve and having an inlet for communication with the patient''s lungs, the venturi being provided with a power jet, a normally closed valve connected with said jet, means for supplYing air under pressure to the jet when said normally closed valve is opened to thereby withdraw gas from a patient''s lungs, and a fluidic control element controlled by said second control element for opening said normally closed valve while the exhalation valve is open.
Claim 3
Dependent Claim
392 words
A ventilator comprising a conduit for supplying a gas to a patient''s lungs, a pneumatically operated pump having a rapid suction stroke and a pressure stroke for alternately drawing in a charge of a gas and then forcing it out through said conduit, means for delivering air under pressure to the pump for operating it, pneumatically operated control means shiftable back and forth between two positions for controlling said delivery of air, means restricting flow of said air from said control means in only one of said positions to admit operating air to the pump slowly to produce a slow pressure stroke, means for supplying control air to said control means for the shifting thereof, a first fluidic control element controlling the supply of control air to said control means, a pneumatically operated timer, a second fluidic control element having an outlet for delivering control air to the first fluidic control element to cause it to shift said control means to connect said air delivering means with the pump to produce the rapid suction stroke of the pump, a first air line for also delivering air from said outlet to the timer to start it operating, a second air line adapted to be opened by the timer when the timer times out, said second air line being connected to the first fluidic control element to cause said first element to shift said control means to connect said air delivering means with the pump to produce the slow pressure stroke of the pump, a normally inoperative third fluidic control element having a power outlet, means controlled by the movement of the pump at the end of its pressure stroke for rendering the third fluidic control element operative, a third air line for delivering control air from said power outlet to said second fluidic control element to cause air to issue from said outlet of said second element, a second pneumatic timer for periodically lengthening said pressure stroke to expel a larger charge of gas than normally, means controlled by the movement of the pump at the end of its pressure stroke during lung inflation for resetting the second timer, a conduit connecting said third fluidic control element to the second timer and normally closed by the second timer, the second timer periodically opening said last-mentioned conduit to render said third control element inoperative.
Claim 4
Dependent Claim
392 words
A ventilator comprising a conduit for supplying a gas to a patient''s lungs, a pneumatically operated pump having a rapid suction stroke and a pressure stroke for alternately drawing in a charge of a gas and then forcing it out through said conduit, means for delivering air under pressure to the pump for operating it, pneumatically operated control means shiftable back and forth between two positions for controlling said delivery of air, means restricting flow of said air from said control means in only one of said positions to admit operating air to the pump slowly to produce a slow pressure stroke, means for supplying control air to said control means for the shifting thereof, a first fluidic control element controlling the supply of control air to said control means, a pneumatically operated timer, a second fluidic control element having an outlet for delivering control air to the first fluidic control element to cause it to shift said control means to connect said air delivering means with the pump to produce the rapid suction stroke of the pump, a first air line for also delivering air from said outlet to the timer to start it operating, a second air line adapted to be opened by the timer when the timer times out, said second air line being connected to the first fluidic control element to cause said first element to shift said control means to connect said air delivering means with the pump to produce the slow pressure stroke of the pump, a normally inoperative third fluidic control element having a power outlet, means controlled by the movement of the pump at the end of its pressure stroke for rendering the third fluidic control element operative, a third air line for delivering control air from said power outlet to said second fluidic control element to cause air to issue from said outlet of said second element, a second pneumatic timer for periodically lengthening said pressure stroke to expel a larger charge of gas than normally, means controlled by the movement of the pump at the end of its pressure stroke during lung inflation for resetting the second timer, a conduit connecting said third fluidic control element to the second timer and normally closed by the second timer, the second timer periodically opening said last-mentioned conduit to render said third control element inoperative.
Claim 5
Dependent Claim
406 words
A ventilator comprising a conduit for supplying a gas to a patient''s lungs, a pump having an outlet connected with the conduit and having a fluid pressure cylinder and a piston movable back and forth therein for alternately drawing gas into the pump and forcing it out through said conduit, pneumatically operated valves connected with the opposite ends of the cylinder, means for supplying operating air under pressure through said valves to the cylinder, means for supplying control air to said valves for operating them, means restricting flow of operating air from one of said valves in one position to one end of the cylinder to cause the pump to force gas out through said conduit, said valves in another position by-passing said restricting means to admit operating air to the other end of the cylinder rapidly to cause the pump to draw in gas, a first bistable fluid amplifier controlling the control air supply to said valves, a pneumatically operated timer, a second bistable fluid amplifier having an outlet for delivering control air to said first fluid amplifier to cause it to operate the valves to connect said air supplying means to said other end of the cylinder,a first air line for delivering air from said outlet to the timer to start it operating, a second air line adapted to be opened by the timer when the timer times out, said second air line being connected to the first fluid amplifier to cause said first fluid amplifier to operate said valves to connect said air supplying means to said one end of the cylinder, a normally inoperative third fluid amplifier having a power outlet, means controlled by the movement of said piston during lung inflation for rendering the third fluid amplifier operative, and a third air line for delivering control air from said power outlet to said second fluid amplifier to cause air to issue from said outlet of said second fluid amplifier, said third fluid amplifier being a monostable element having an inlet passage, a normal outlet passage, a control passage for shifting a stream of air from the normal outlet to said power outlet, and a by-pass connecting said inlet passage to the control passage for normally directing a stream of air through the control passage away from said fluid amplifier, and said piston-controlled means including means for blocking said stream from the control passage to cause it to effect said stream shift.
Claim 6
Dependent Claim
406 words
A ventilator comprising a conduit for supplying a gas to a patient''s lungs, a pump having an outlet connected with the conduit and having a fluid pressure cylinder and a piston movable back and forth therein for alternately drawing gas into the pump and forcing it out through said conduit, pneumatically operated valves connected with the opposite ends of the cylinder, means for supplying operating air under pressure through said valves to the cylinder, means for supplying control air to said valves for operating them, means restricting flow of operating air from one of said valves in one position to one end of the cylinder to cause the pump to force gas out through said conduit, said valves in another position by-passing said restricting means to admit operating air to the other end of the cylinder rapidly to cause the pump to draw in gas, a first bistable fluid amplifier controlling the control air supply to said valves, a pneumatically operated timer, a second bistable fluid amplifier having an outlet for delivering control air to said first fluid amplifier to cause it to operate the valves to connect said air supplying means to said other end of the cylinder,a first air line for delivering air from said outlet to the timer to start it operating, a second air line adapted to be opened by the timer when the timer times out, said second air line being connected to the first fluid amplifier to cause said first fluid amplifier to operate said valves to connect said air supplying means to said one end of the cylinder, a normally inoperative third fluid amplifier having a power outlet, means controlled by the movement of said piston during lung inflation for rendering the third fluid amplifier operative, and a third air line for delivering control air from said power outlet to said second fluid amplifier to cause air to issue from said outlet of said second fluid amplifier, said third fluid amplifier being a monostable element having an inlet passage, a normal outlet passage, a control passage for shifting a stream of air from the normal outlet to said power outlet, and a by-pass connecting said inlet passage to the control passage for normally directing a stream of air through the control passage away from said fluid amplifier, and said piston-controlled means including means for blocking said stream from the control passage to cause it to effect said stream shift.
Claim 7
Dependent Claim
312 words
A ventilator comprising a conduit for supplying a gas to a patient''s lungs, a pump having an outlet connected with the conduit and having a fluid pressure cylinder and a piston movable back and forth therein for alternately drawing gas into the pump and forcing it out through said conduit, pneumatically operated valves connected with the opPosite ends of the cylinder, means for supplying operating air under pressure through said valves to the cylinder, means for supplying control air to said valves for operating them, means restricting flow of operating air from one of said valves in one position to one end of the cylinder to cause the pump to force gas out through said conduit, said valves in another position by-passing said restricting means to admit operating air to the other end of the cylinder rapidly to cause the pump to draw in gas, a first bistable fluid amplifier controlling the control air supply to said valves, a pneumatically operated timer, a second bistable fluid amplifier having an outlet for delivering control air to said first fluid amplifier to cause it to operate the valves to connect said air supplying means to said other end of the cylinder, a first air line for delivering air from said outlet to the tImer to start when the timer times out, said second air line being connected tO the first fluid amplifier to cause said first fluid amplifier to operate said valves to connect said air supplying means to said one end of the cylinder, a normally inoperative third Fluid amplifier having a power outlet, means controlled by the movement of said piston during lung inflation for rendering the third fluid amplifier operative, and a third air line for delivering control air from said power outlet to said second fluid amplifier to cause air to issue from said outlet of said second fluid amplifier.
Claim 8
Dependent Claim
312 words
A ventilator comprising a conduit for supplying a gas to a patient''s lungs, a pump having an outlet connected with the conduit and having a fluid pressure cylinder and a piston movable back and forth therein for alternately drawing gas into the pump and forcing it out through said conduit, pneumatically operated valves connected with the opPosite ends of the cylinder, means for supplying operating air under pressure through said valves to the cylinder, means for supplying control air to said valves for operating them, means restricting flow of operating air from one of said valves in one position to one end of the cylinder to cause the pump to force gas out through said conduit, said valves in another position by-passing said restricting means to admit operating air to the other end of the cylinder rapidly to cause the pump to draw in gas, a first bistable fluid amplifier controlling the control air supply to said valves, a pneumatically operated timer, a second bistable fluid amplifier having an outlet for delivering control air to said first fluid amplifier to cause it to operate the valves to connect said air supplying means to said other end of the cylinder, a first air line for delivering air from said outlet to the tImer to start when the timer times out, said second air line being connected tO the first fluid amplifier to cause said first fluid amplifier to operate said valves to connect said air supplying means to said one end of the cylinder, a normally inoperative third Fluid amplifier having a power outlet, means controlled by the movement of said piston during lung inflation for rendering the third fluid amplifier operative, and a third air line for delivering control air from said power outlet to said second fluid amplifier to cause air to issue from said outlet of said second fluid amplifier.
Claim 9
Dependent Claim
60 words
A ventilator according to claim 4, including a pneumatically operated normally open exhalation valve connected With said conduit, said second fluid amplifier having a second outlet, and said second air line also delivering control air from the timer to said second fluid amplifier to cause it to deliver air from its second outlet to the exhalation valve to close it.
Claim 10
Dependent Claim
49 words
A ventilator according tO claim 4, including an exhalation valve connected with said cOnduit having a closed position and an open position, the valve normally being in one of said positions, and said second fluid amplifier being operatively connected with the valve for shifting it to its other position.
Claim 11
Dependent Claim
42 words
A ventIlator according to claim 4, including normally inactive means responsive to excessive gas pressure in a patient''s lungs while the pump is forcing gas through saId conduit for reversing said first fluid amplifier, whereby to start the pump drawing in gas.
Claim 12
Dependent Claim
51 words
A ventilator according to claim 4, including a second pneumatic timer for periodically lengthening said pressure stroke to thereby expel a larger charge of gas than normally, and means controlled by the movement of the pump at the end of its pressure stroke durIng lung inflation for resetting the second timer.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |