US3841327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anesthesia ventilator apparatus
Assignee: Airco Inc
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Filing: 1973-07-02
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Granted: 1974-10-15
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Expires: 1993-07-02
Abstract
Abstract An improvement is disclosed for anesthesia ventilating apparatus of the type including a patient breathing circuit, a bellows in the breathing circuit which by its expansion and contraction regulates the volume of gas cycled to the patient, a chamber surrounding the bellows, a pneumatic powering system for cyclically pressurizing and depressurizing the chamber to effect expansion and contraction of the bellows, and a highly flexible diaphragm which serves to separate, fluidly, the patient circuit from the pneumatic powering system, yet which transmits a negative pressure signal from the patient upon an attempt to inhale to trigger cycling of the pneumatic system. In the improvement, the highly flexible diaphragm, called a pucker plate, is mounted in an enclosed chamber located exterior of the bellows chamber, preferably above the chamber, and which has only its under surface in communication with the patient circuit, thus precluding moisture from accumulating on the upper surface of the flexible diaphragm, thereby assuring indefinite service without response changes due to the accumulation of such moisture on the flexible diaphragm.
Inventors
- 👤 W Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:29
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0057; A61M16/0081; A61M16/10; A61M16/104; A61M16/0075
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
In anesthesia ventilating apparatus of the type including a patient breathing circuit; a bellows in said breathing circuit adapted to expand and contract to cycle gas to the patient circuit, a bellows chamber surrounding said bellows; a pneumatic powering system for cyclically pressurizing said chamber to cause the expansion and contraction of said bellows; and a highly flexible diaphragm mounted intermediate the said patient circuit and said pneumatic powering system and adapted to be displaced by a negative pressure signal from said patient circuit to effect a negative pressure signal to said pneumatic powering system for triggering cycling of said pneumatic system; the improvement comprising a diaphragm chamber containing said flexible diaphragm, said diaphragm separating said chamber into first and second separate gas spaces, said first gas space being located above said flexible diaphragm and communicating with said pneumatic powering system, and said second chamber being located below said flexible diaphragm and communicating with said patient circuit whereby moisture within said patient circuit collects on the bottom of said flexible diaphragm and drains downwardly therefrom.
Claim 2
Dependent Claim
175 words
In anesthesia ventilating apparatus of the type including a patient breathing circuit; a bellows in said breathing circuit adapted to expand and contract to cycle gas to the patient circuit, a bellows chamber surrounding said bellows; a pneumatic powering system for cyclically pressurizing said chamber to cause the expansion and contraction of said bellows; and a highly flexible diaphragm mounted intermediate the said patient circuit and said pneumatic powering system and adapted to be displaced by a negative pressure signal from said patient circuit to effect a negative pressure signal to said pneumatic powering system for triggering cycling of said pneumatic system; the improvement comprising a diaphragm chamber containing said flexible diaphragm, said diaphragm separating said chamber into first and second separate gas spaces, said first gas space being located above said flexible diaphragm and communicating with said pneumatic powering system, and said second chamber being located below said flexible diaphragm and communicating with said patient circuit whereby moisture within said patient circuit collects on the bottom of said flexible diaphragm and drains downwardly therefrom.
Claim 3
Dependent Claim
19 words
Apparatus in accordance with claim 1 wherein said diaphragm chamber is mounted above and exterior of said bellows chamber.
Claim 4
Dependent Claim
24 words
Apparatus in accordance with claim 1 wherein said flexible diaphragm is circular and has its periphery sealed to the interior of said enclosed chamber.
Claim 5
Dependent Claim
186 words
An anesthesia ventilator for delivering gas to a patient comprising: a patient circuit; a head; a cylindrical bellows chamber depending from said head, having its upper peripheral rim sealed to said head and being closed at its lower end; a collapsible bellows suspended within said chamber for delivering fluid to said patient circuit and having its upper open end sealed to said head; a flexible diaphragm mounted on top of said head, having its bottom surface in communication with said patient circuit, and its top surface in communication with said bellows chamber, said flexible diaphragm adapted to flex upon sensing a negative pressure in the patient circuit to transmit the negative pressure to said bellows chamber; a pneumatic powering system communicating with said bellows chamber and adapted to respond to a negative pressure in said bellows chamber to pressurize said bellows chamber and thereby force said bellows to collapse whereby gas within said bellows is forced into the patient circuit; normally open valve means venting the patient circuit, said valve means adapted to sense the increased pressure in said bellows chamber to close said valve means.
Claim 6
Dependent Claim
186 words
An anesthesia ventilator for delivering gas to a patient comprising: a patient circuit; a head; a cylindrical bellows chamber depending from said head, having its upper peripheral rim sealed to said head and being closed at its lower end; a collapsible bellows suspended within said chamber for delivering fluid to said patient circuit and having its upper open end sealed to said head; a flexible diaphragm mounted on top of said head, having its bottom surface in communication with said patient circuit, and its top surface in communication with said bellows chamber, said flexible diaphragm adapted to flex upon sensing a negative pressure in the patient circuit to transmit the negative pressure to said bellows chamber; a pneumatic powering system communicating with said bellows chamber and adapted to respond to a negative pressure in said bellows chamber to pressurize said bellows chamber and thereby force said bellows to collapse whereby gas within said bellows is forced into the patient circuit; normally open valve means venting the patient circuit, said valve means adapted to sense the increased pressure in said bellows chamber to close said valve means.
Claim 7
Dependent Claim
139 words
In anesthesia ventilating apparatus of the type including a patient breathing circuit; a bellows in said breathing circuit adapted to expand and contract to cycle gas to the patient circuit; a bellows chamber surrounding said bellows; a pneumatic powering system communicating with said bellows chamber for cyclically pressurizing said chamber to cause the expansion and contraction of said bellows; the improvement comprising: a diaphragm chamber, a flexible diaphragm separating said chamber into an upper gas space and a lower gas space, the upper gas space communicating with the pneumatic powering system and the lower gas space communicating with the patient breathing circuit wherein moisture from said patient circuit collects on the lowermost side of said flexible diaphragm, said diaphragm being responsive to a negative pressure signal in said patient circuit to transmit said signal to said pneumatic powering system.
Claim 8
Dependent Claim
139 words
In anesthesia ventilating apparatus of the type including a patient breathing circuit; a bellows in said breathing circuit adapted to expand and contract to cycle gas to the patient circuit; a bellows chamber surrounding said bellows; a pneumatic powering system communicating with said bellows chamber for cyclically pressurizing said chamber to cause the expansion and contraction of said bellows; the improvement comprising: a diaphragm chamber, a flexible diaphragm separating said chamber into an upper gas space and a lower gas space, the upper gas space communicating with the pneumatic powering system and the lower gas space communicating with the patient breathing circuit wherein moisture from said patient circuit collects on the lowermost side of said flexible diaphragm, said diaphragm being responsive to a negative pressure signal in said patient circuit to transmit said signal to said pneumatic powering system.
References Cited (Backward Citations)
US3046979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |