US3916889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Patient ventilator apparatus
Assignee: Sandoz AG
•
Filing: 1973-09-28
•
Granted: 1975-11-04
•
Expires: 1993-09-28
Abstract
Abstract Disclosed herein is a patient ventilator apparatus having a pneumatic control system operable in three different modes wherein the apparatus assists the breathing of the patient, controls the patient''s breathing in a timed manner, or operates in a combination assist/control mode according to certain predetermined conditions. Fluidic circuitry controls a valved bellows apparatus, which in turn supplies air to a patient subject to limitations of time, volume, and pressure, wherein the gas supplied to the bellows comprises an adjustable oxygen/air mixture. Fluidic timers are provided for use in the control mode of the circuitry, and identical fluidic circuitry combinations are provided for use in the assist mode to automatically trigger the ventilator apparatus into an inspiratory state according to the patient''s breathing requirements and to trigger such apparatus into an exhalation state when a predetermined inspiratory pressure is attained.
Inventors
- 👤 George K Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:51
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0003; A61M16/0009; A61M16/0012; A61M16/0057; A61M16/0081; A61M16/0075; A61M16/10; A61M16/105; A61M16/106; A61M16/107; A61M2205/00; A61M2205/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
451 words
A fluidically controlled patient ventilator apparatus comprising: a patient breathing hose; means for supplying a predetermined quantitiy of air to the patient breathing hose; a fluidic flip flop circuit switchable into first and second states, said flip flop circuit having opposed input ports for controlling said switching, and having at least one output port providing a pressure signal while said flip flop circuit is switched into said first stable state; means coupled between said flip flop circuit output port and said air supply means to actuate the latter to supply air to the breathing hose in reponse to said pressure signal, thereby defining an inspiratory period of operation; a first fluidic timing means actuable during said inspiratory period and a second fluidic timing means actuable during an exhalation period, said first And second timing means having respective output ports coupled to said opposed input ports of said flip flop for controlling said flip flop to switch between said stable states, wherein an output signal from said first timing means actuates said flip flop to switch from its first to its second stable state, nd an output from said second timing means actuates said flip flop to switch from its second to its first stable state; a fluidic trigger circuit having an input coupled to said patient breathing hose for providing a trigger signal at an output port thereof in reponse to a minimum pressure in said patient breathing hose corresponding to the termination of a patient exhalation cycle and means coupling said trigger signal to one of said input ports of said flip flop to control said flip flop to switch from its second to its first stable state to initiate said inspiratory period; a fluidic pressure limit circuit having an input port coupled to said patient breathing hose for providing a limit signal at an output port thereof in reponse to a predetermined maximum pressure in the patient breathing hose, and means coupling said limit signal to one of said input ports of said flip flop to control said flip flop to switch from its first to its second stable state to terminate said inspiratory period; a volume limit signal generating means coupled to said patient breathing hose for providing a trigger output signal in response to the sensing of a predetermined quantity of air supplied to the patient breathing hose by the air supply means, and means coupling said trigger signal to one of said input ports of said flip flop to control said flip-flop to switch from its first to its second stable state to terminate said inspiratory period; and mode selecting means for selectively deenergizing said trigger circuit and said first timing means, one at a time.
Claim 2
Dependent Claim
451 words
A fluidically controlled patient ventilator apparatus comprising: a patient breathing hose; means for supplying a predetermined quantitiy of air to the patient breathing hose; a fluidic flip flop circuit switchable into first and second states, said flip flop circuit having opposed input ports for controlling said switching, and having at least one output port providing a pressure signal while said flip flop circuit is switched into said first stable state; means coupled between said flip flop circuit output port and said air supply means to actuate the latter to supply air to the breathing hose in reponse to said pressure signal, thereby defining an inspiratory period of operation; a first fluidic timing means actuable during said inspiratory period and a second fluidic timing means actuable during an exhalation period, said first And second timing means having respective output ports coupled to said opposed input ports of said flip flop for controlling said flip flop to switch between said stable states, wherein an output signal from said first timing means actuates said flip flop to switch from its first to its second stable state, nd an output from said second timing means actuates said flip flop to switch from its second to its first stable state; a fluidic trigger circuit having an input coupled to said patient breathing hose for providing a trigger signal at an output port thereof in reponse to a minimum pressure in said patient breathing hose corresponding to the termination of a patient exhalation cycle and means coupling said trigger signal to one of said input ports of said flip flop to control said flip flop to switch from its second to its first stable state to initiate said inspiratory period; a fluidic pressure limit circuit having an input port coupled to said patient breathing hose for providing a limit signal at an output port thereof in reponse to a predetermined maximum pressure in the patient breathing hose, and means coupling said limit signal to one of said input ports of said flip flop to control said flip flop to switch from its first to its second stable state to terminate said inspiratory period; a volume limit signal generating means coupled to said patient breathing hose for providing a trigger output signal in response to the sensing of a predetermined quantity of air supplied to the patient breathing hose by the air supply means, and means coupling said trigger signal to one of said input ports of said flip flop to control said flip-flop to switch from its first to its second stable state to terminate said inspiratory period; and mode selecting means for selectively deenergizing said trigger circuit and said first timing means, one at a time.
Claim 3
Dependent Claim
70 words
A fluidically controlled patient ventilator apparatus as set forth in claim 1 further comprising an adjustable oxygen/air mixing valve means coupled between said inlet valve and said bellows element for selective positioning to control the oxygen content of the air within the bellows, element wherein said mixing valve means is coupled to a source of room air, and is coupled through said inlet valve means to a source of oxygen.
Claim 4
Dependent Claim
121 words
A fluidically controlled ventilator apparatus as set forth in claim 2 wherein said bellows chamber comprises a fixed volume surrounding said bellows element, and further comprising means responsive to said pressure signal from said one output port of said flip flop circuit for charging said bellows chamber with oxygen to collapse said bellows and discharge the air therein through said outlet valve means; said bellows element having a weight mounted therein for causing its expansion upon depressurization of said bellows chamber; and further comprising conduit means interconnecting said bellows chamber and said inlet valve means wherein said oxygen charged into said bellows chamber escapes through said inlet valve for selective coupling through said mixing valve means to said expanding bellows element.
Claim 5
Dependent Claim
205 words
A fluidically controlled patient ventilator apparatus as set forth in claim 1 wherein said flip flop circuit has a second output port for generating a pressure signal while said flip flop is switched into its second stable state defining an exhalation period of the apparatus, and wherein said first and second timing means comprise respective first and second fluidic logic switching circuits, first and second sealed cannisters, and first and second pressurized bellows members disposed within said sealed cannisters, said first switching circuit having output port means coupled for actuation by the pressure signal from said second output port of said flip flop circuit to charge a regulated quantity of air into said first cannister, and said second switching circuit having output port means coupled for actuation by the pressure signal of said first output port of said fLip flop circuit to charge said second cannister, wherein said charging of said cannisters causes the bellows members therein to collapse, and first and second sensing means for generating said timing means output signals in response to said collapse of said respective bellows after a predetermined air charging time of said cannisters, said sensing means being coupled to said opposed input ports of said flip flop circuits.
Claim 6
Dependent Claim
87 words
A fluidically controlled patient ventilator apparatus as set forth in claim 4 wherein said first and second sensing means are movably mounted, and wherein movement thereof changes said predetermined air charging times at which said output signals are generated, and further comprising a rotatable shaft having a pair of cams mounted thereon in a spaced relation for engaging said first and second sensing means, whereby rotation of said shaft and cams moves said sensing means and changes the timing periods of said first and second timing means.
Claim 7
Dependent Claim
39 words
A fluidically controlled patient ventilator apparatus as set forth in claim 5 further comprising an adjustable by-pass valve connected to change the charging time of said first cannister for independently adjusting the timing period of said first timing means.
Claim 8
Dependent Claim
54 words
A fluidically controlled patient ventilator apparatus as set forth in claim 6 further comprising first and second dump valve means mounted respectively on said first and second cannisters for depressurizing said cannisters in response to input signals received respectively from said second output port and said one output port of said flip flop circuit.
Claim 9
Dependent Claim
105 words
A fluidically controlled patient ventilator apparatus as set forth in claim 1 wherein said trigger circuit and said pressure limit circuit are constructed identically and comprise three proportional amplifiers connected in series, and three fluidic flip flops connected in series with each other and in series with an output of said three fluidic amplifiers, and wherein said trigger circuit further comprises means for connecting inputs of one of said three fluidic amplifiers to a pressure source for adjusting the sensitivity thereof, and for connecting inputs of another one of said fluidic amplifiers to a positive end expiratory pressure signal and to said patient breathing hose.
Claim 10
Dependent Claim
122 words
A fluidically controlled patient ventilator apparatus as set forth in claim 1 further comprising a positive end expiratory pressure circuit having an output coupled to an input port of said patient trigger circuit for providing a bias signal thereto, said end expiratory pressure circuit including a fluidic capacitance having an output port coupled as said input to said trigger circuit; an adjustable offset pressure valve having an output coupled as an input to said fluidic capacitance; a pressure actuated gate valve having an output coupled to the input of said offset valve, having an input coupled to a source of positive end expiratory pressure sinals, and having a gate input coupled for actuation by said flip flop circuit during said inspiratory period.
Claim 11
Dependent Claim
83 words
A fluidically controlled patient ventilator apparatus as set forth in claim 1 further comprising first and second manually operable pressure switches connected respectively to said opposed inputs of said flip flop for switching said flip flop from one of its stable states to its other stable state, and first, second and third indicator displaymeans coupled respectively to the outputs of said patient trigger circuit, said pressure limit circuit, and said first timing means for indicating the presence of signals at the outputs thereof.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |