Patent US3820539A successfully refreshed from Google Patents.
US3820539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilator with compliance isolation switch
Assignee: Veriflo Corp
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Filing: 1973-10-01
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Granted: 1974-06-28
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Expires: 1993-10-01
Abstract
Abstract A ventilator apparatus having (1) a main outlet which supplies breathing gas during each inspiratory phase and supplies none during each expiratory phase, (2) a pressure switch that provides gas under pressure during each inspiratory phase and is cut off and bled to atmosphere during each expiratory phase, is connected to a patient''s breathing circle via a series of elements having a substantial volume and a substantial compliance. The present invention interposes a compliance isolation switch between these elements and the patient''s breathing circle. This switch has a control means connected by a control line to the pressure switch for opening the switch at the beginning of each inspiratory phase and for closing it at the beginning of each expiratory phase.
Inventors
- 👤 L Ollivier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:28
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/105; A61M16/1055; A61M16/106; A61M16/1065; A61M16/0003; A61M2016/0015; A61M2016/0018; A61M2016/0024
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
256 words
Ventilator apparatus comprising: a ventilator having means providing an inspiratory phase and an expiratory phase, a main outlet, means for opening said main outlet for supplying a preset volume of breathing gas through said main outlet during each inspiratory phase and for closing said outlet during each expiratory phase, and a pressure switch for generating a control signal having a positive pressure during each inspiratory phase and cut Off and bled to atmosphere during each expiratory phase, a patient''s breathing circle having in series an inlet tubing, a tee connection to the patient, a connection tubing, and an exhalation valve which during the patient''s exhalation opens said breathing circle to the atmosphere, a main tube connected to said main outlet, a series of elements connected to said main tube, said series of elements having a substantial volume and a substantial compliance, and a compliance isolation switch interposed between and connected to said series of elements and said inlet tubing of said patient''s breathing circle, said compliance isolation switch comprising control means connected to said pressure switch and applying said control signal for opening said compliance isolation switch at the beginning of each said inspiratory phase to provide communication for said breathing gas from said series of elements to said breathing circle and for closing it at the beginning of each said expiratory phase, thereby trapping breathing gas in said main tube and in said series of elements at a pressure equal to the pressure reached in the breathing circle at the end of the inspiratory phase.
Claim 2
Dependent Claim
256 words
Ventilator apparatus comprising: a ventilator having means providing an inspiratory phase and an expiratory phase, a main outlet, means for opening said main outlet for supplying a preset volume of breathing gas through said main outlet during each inspiratory phase and for closing said outlet during each expiratory phase, and a pressure switch for generating a control signal having a positive pressure during each inspiratory phase and cut Off and bled to atmosphere during each expiratory phase, a patient''s breathing circle having in series an inlet tubing, a tee connection to the patient, a connection tubing, and an exhalation valve which during the patient''s exhalation opens said breathing circle to the atmosphere, a main tube connected to said main outlet, a series of elements connected to said main tube, said series of elements having a substantial volume and a substantial compliance, and a compliance isolation switch interposed between and connected to said series of elements and said inlet tubing of said patient''s breathing circle, said compliance isolation switch comprising control means connected to said pressure switch and applying said control signal for opening said compliance isolation switch at the beginning of each said inspiratory phase to provide communication for said breathing gas from said series of elements to said breathing circle and for closing it at the beginning of each said expiratory phase, thereby trapping breathing gas in said main tube and in said series of elements at a pressure equal to the pressure reached in the breathing circle at the end of the inspiratory phase.
Claim 3
Dependent Claim
19 words
The ventilator apparatus of claim 1 wherein said series of elements comprises a bacteria filter, a humidifier, and conduits.
Claim 4
Dependent Claim
67 words
The ventilator apparatus of claim 1 having means for reducing the pressure of said control signal coming from said pressure switch before application to said control means of said compliance isolation switch, comprising a small inlet orifice connected to said pressure switch and a bleed orifice downstream of said inlet orifice, and passage means connecting said inlet orifice to said control means of said compliance isolation switch.
Claim 5
Dependent Claim
187 words
The ventilator apparatus of claim 1 wherein said compliance isolation switch comprises: a housing providing an inlet chamber having an inlet opening connected to said series of elements and an outlet chamber having an outlet opening connected to said breathing circle, with a throat between them, valve means for opening and closing said throat, spring means urging said valve toward its closed position, and a diaphragm in said housing in engagement with said valve means and providing a control chamber on the opposite side of said diaphragm from said valve means, said diaphragm and control chamber comprising said control means, said control chamber being connected to said pressure switch so that said control signal places increased pressure on said diaphragm during each inspiratory phase and causes said diaphragm to open said valve means and enable passage of gas between said inlet chamber and said outlet chamber, and removes the pressure from said control chamber during each expiratory phase, so that spring means then closes said valve means and isolates said inlet chamber from said outlet chamber and thereby isolates said series of elements from said breathing circle.
Claim 6
Dependent Claim
39 words
The ventilator of claim 4 having means presetting said valve means and said spring means to open said valve means even without application of said control signal if the pressure in said inlet chamber should exceed a predetermined value.
Claim 7
Dependent Claim
154 words
The ventilator apparatus of claim 1 wherein said compliance isolation switch comprises: a housing providing an inlet connected to said series of elements and therethrough to said main outlet and an outlet connected to said patient''s breathing circle, valve means for joining and separating said inlet and outlet, normally urged toward its separating position, and pressure-responsive means in said housing being in engagement with said valve means and providing a control chamber, said pressure-responsive means and said control chamber comprising said control means, said control chamber being connected to said pressure switch and having means for (1) placing pressure on said pressure-responsive means during each inspiratory phase and causing said pressure-responsive means to move Said valve to its joining position enabling passage of gas between said inlet and said outlet, and (2) removing pressure from said control chamber during each expiratory phase, so that the valve means then separates said inlet from said outlet.
Claim 8
Dependent Claim
46 words
The ventilator apparatus of claim 6 wherein said control chamber is connected to said pressure switch through a pressure-reducing network lying between said pressure switch and said control chamber, said pressure-reducing network including a small inlet orifice and a bleed orifice downstream of the inlet orifice.
Claim 9
Dependent Claim
23 words
The ventilator of claim 6 having means for opening said valve means also when pressure in said inlet exceeds a predetermined excess value.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |