Patent US3812878A successfully refreshed from Google Patents.
US3812878A
Expired / Lapsed
US
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Fail-safe breathing circuit and valve assembly for use therewith
Assignee: Bird Inc
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Filing: 1973-03-19
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Granted: 1974-05-28
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Expires: 1993-03-19
Abstract
Abstract Breathing circuit for use in supplying gas under pressure to the airway of a patient having a control with an inspiratory and expiratory phase for controlling the supply of gas. Means is provided for supplying the gas to the patient to ventilate the patient. An exhalation valve which is controlled by the controller controls the flow of expiratory gases from the patient. Manual means is provided for ventilating the patient in the event of failure of the controller. A first valve assembly having an inspiratory one-way valve and an expiratory one-way valve is provided for maintaining the inspiratory and expiratory gases separate. The first valve assembly is coupled to a second valve assembly which is coupled to the exhalation valve assembly. A resuscitation bulb is coupled to the second valve assembly and is utilized for supplying gas under pressure through the second valve assembly and through the inspiratory one-way check valve to the airway of the patient.
Inventors
- 👤 F Bird
- 👤 H Pohndorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:06
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/08; A61M16/0816; A61M16/0833; F; F16; F16K; F16K15/00; F16K15/14; F16K15/1401; F16K15/16; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7879; Y10T137/7888; Y10T137/7891
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
191 words
In a valve assembly for controlling the flow of a gas, a body having a chamber therein, said body being formed with first, second and third passages in communication with said chamber, a one-way check valve mounted in said first passage permitting gas to flow only into said chamber, an additional one-way check valve mounted in said third passage permitting gas to flow only out of said chamber, said one-way check valves each including first and second rings, a member formed of an elastomer disposed between said first and second rings, said member having a circumferential margin formed with an arcuate slit which subtends over 270* to provide a flapper valve member positioned centrally of said margin and connected therewith by a hinge portion of said member, one of said rings being provided with a valve seat, said first and second rings being provided with inclined surfaces engaging opposite sides of said margin and applying a bias to said flapper member so that the flapper valve member is yieldably urged into engagement with the valve seat, and means securing said first and second rings and said member into a unitary assembly.
Claim 2
Dependent Claim
191 words
In a valve assembly for controlling the flow of a gas, a body having a chamber therein, said body being formed with first, second and third passages in communication with said chamber, a one-way check valve mounted in said first passage permitting gas to flow only into said chamber, an additional one-way check valve mounted in said third passage permitting gas to flow only out of said chamber, said one-way check valves each including first and second rings, a member formed of an elastomer disposed between said first and second rings, said member having a circumferential margin formed with an arcuate slit which subtends over 270* to provide a flapper valve member positioned centrally of said margin and connected therewith by a hinge portion of said member, one of said rings being provided with a valve seat, said first and second rings being provided with inclined surfaces engaging opposite sides of said margin and applying a bias to said flapper member so that the flapper valve member is yieldably urged into engagement with the valve seat, and means securing said first and second rings and said member into a unitary assembly.
Claim 3
Dependent Claim
136 words
In a check valve assembly, a valve housing, first and second rings mounted in juxtaposed relationship in said housing, a member formed of elastomer and having an outer annular margin disposed between said first and second rings, said member being formed with an arcuate slit therein subtending over 270* of said margin to define an inner circular flapper-type valve member moveable in said rings and with the un-slit portion of said member between said flapper-type valve and the margin defining an integral hinge, one of said rings being provided with a valve seat, said first and second rings being provided at their facing sides with inclined surfaces engaging opposite sides of said margin and holding the same at an inclination with respect to said member tO yieldably bias the latter into engagement with said valve seat.
Claim 4
Dependent Claim
136 words
In a check valve assembly, a valve housing, first and second rings mounted in juxtaposed relationship in said housing, a member formed of elastomer and having an outer annular margin disposed between said first and second rings, said member being formed with an arcuate slit therein subtending over 270* of said margin to define an inner circular flapper-type valve member moveable in said rings and with the un-slit portion of said member between said flapper-type valve and the margin defining an integral hinge, one of said rings being provided with a valve seat, said first and second rings being provided at their facing sides with inclined surfaces engaging opposite sides of said margin and holding the same at an inclination with respect to said member tO yieldably bias the latter into engagement with said valve seat.
References Cited (Backward Citations)
US3119411A
Cited
US3572375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |