US3672366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve and circuit for intermittent positive pressure breathing apparatus
Assignee: Individual
•
Filing: 1967-09-29
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Granted: 1972-06-27
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Expires: 1987-09-29
Abstract
Abstract An apparatus for producing intermittent positive pressure comprises a high-pressure nutrient gas supply, a valve device connected to the supply and operable by the gas, and a conduit connected downstream of the valve device to lead gas under low pressure towards a patient or a space between a breathing bag and a surrounding casing. The valve device controls gas flow through the conduit and opens and closes with relatively sudden pressure change. The valve device can include a housing having a tubular, high-pressure gas inlet and a low-pressure gas outlet, a member in the housing co-axial with the inlet and longitudinally movable thereon with clearance, a valve closure at one end of said member movable therewith between a first position closing the outlet end of the inlet and leaving open the inlet end of the outlet and a second position closing that inlet end and leaving open that outlet end, a compression spring urging the valve closure into the first position, and a duct communicating with the housing interior and the clearance, and with the open outlet, and leading to outside the housing.
Inventors
- 👤 Geoffrey Barnett Burchell
- 👤 Richard William Victor Morel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:47
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/20; A61M16/208; A61M16/201; A61M16/207; A61M16/209; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
109 words
Respiratory apparatus, comprising supply means for supplying gas under high positive pressure, circuit means connected downstream of said supply means and adapted to emit intermittently said gas under high positive pressure, a valve device connected tO said circuit means to receive intermittently therefrom said gas under high positive pressure, said valve device being adapted to be operated by said gas from said circuit means and being adapted to reduce the pressure of the intermittent gas pulses received from said circuit means from high positive pressure to low positive pressure, and conduit means connected downstream of said valve device for leading said gas under low positive pressure towards a patient.
Claim 2
Dependent Claim
109 words
Respiratory apparatus, comprising supply means for supplying gas under high positive pressure, circuit means connected downstream of said supply means and adapted to emit intermittently said gas under high positive pressure, a valve device connected tO said circuit means to receive intermittently therefrom said gas under high positive pressure, said valve device being adapted to be operated by said gas from said circuit means and being adapted to reduce the pressure of the intermittent gas pulses received from said circuit means from high positive pressure to low positive pressure, and conduit means connected downstream of said valve device for leading said gas under low positive pressure towards a patient.
Claim 3
Dependent Claim
76 words
Apparatus according to claim 1, wherein said valve device includes a gas inlet connected to said circuit means, valve closure means serving to close said inlet, and biassing means strongly urging said closure means to close said inlet, the minimum throughflow area for gas flowing from said inlet to said conduit means, when said closure means is fully open with respect to said inlet, being small compared to the minimum internal cross-sectional area of said inlet.
Claim 4
Dependent Claim
108 words
Apparatus according to claim 1, wherein said circuit means comprises a throttle connected downstream of said supply means, reservoir means connected downstream of said throttle, a single-acting relay valve adapted to alternate between a state in which it prevents and a state in which it allows the flow of said gas under high positive pressure to said valve device, and a control chamber of said relay valve connected downstream of said reservoir means, an increase of the pressure in said chamber beyond a pre-determined value and a decrease of the pressure in said chamber beyond a pre-determined value producing the respective changes of state of said relay valve.
Claim 5
Dependent Claim
21 words
Apparatus according to claim 3, and further comprising a throttle via which said control chamber is connected to an exhaust means.
Claim 6
Dependent Claim
147 words
Apparatus according to claim 1, wherein said valve device comprises a housing, a high-pressure gas inlet part of said housing of tubular form, a low-pressure gas outlet part of said housing, valve closure means in said housing movable between a first position in which said valve closure means closes the outlet end of said inlet part and the inlet end of said outlet part is open, and a second position in which said valve closure means closes said inlet end and said outlet end is open, a member of said valve closure means co-axial with said inlet part, portions of said member and said inlet part defining radial clearance therebetween, and biassing means urging said valve closure means into said first position, said conduit means communicating with the interior of said housing and thus with said clearance, and with said outlet part when the latter is open.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 5, wherein said member is a sleeve encircling said inlet part and closed at one end.
Claim 8
Dependent Claim
26 words
Apparatus according to claim 5, wherein said inlet part and said outlet part are disposed at respective opposite sides of said housing and are substantially co-axial.
Claim 9
Dependent Claim
17 words
Apparatus according to claim 5 and further comprising a pressure-relief valve in communication with said conduit means.
Claim 10
Dependent Claim
57 words
Apparatus according to claim 5, wherein said housing comprises a tubular portion encircling said member, said valve closure means being movable in said tubular portion with clearance and bounding an intermediate-pressure chamber in said housing which chamber is also bounded by said tubular portion and communicates directly with the clearance between said member and said inlet part.
Claim 11
Dependent Claim
98 words
Apparatus according to claim 5, wherein said circuit means comprises throttle means connected downstream of said supply means, and reservoir means connected downstream of said throttle means, said valve device being connected downstream of said reservoir means, the arrangement being such that, when the apparatus is in use, the rate of flow of said gas through said valve device during the time period that said valve device is open is greater than the rate of flow of said gas through said throttle means, and the consequent pressure variations in said reservoir are utilized to operate said valve deVice.
Claim 12
Dependent Claim
184 words
Apparatus according to claim 1, wherein said circuit means comprises first conduit means leading to said valve device, second conduit means, first, second and third supply members of said supply means, a double-acting piston valve interposed between said supply means and said valve device for connecting said first conduit means to the ambient atmosphere and said second conduit means to said first supply member, branch conduit means leading from said first conduit means, portions of said double-acting piston valve defining first and second control chambers thereof for connection to said second and third supply members, respectively, first and second relay valves, portions of said first and second relay valves defining third and fourth control chambers thereof, first and second reservoir means, and first and second throttle means, said second conduit means and said branch conduit means leading via said first and second throttle means, respectively, to said first and second reservoir means and thence to said third and fourth control chambers, said relay valves operatively connecting said first control chamber to its associated supply member and said second control chamber to the ambient atmosphere.
Claim 13
Dependent Claim
29 words
Apparatus as claimed in claim 11, wherein said first conduit means is connected to the first supply member and the second conduit means is connected to the ambient atmosphere.
Claim 14
Dependent Claim
29 words
Apparatus as claimed in claim 11, wherein the first control chamber is connected to the ambient atmosphere and the second control chamber is connected to its associated supply member.
Claim 15
Dependent Claim
50 words
Apparatus as claimed in claim 11, wherein said first conduit means is connected to the first supply member, the second conduit means is connected to the ambient atmosphere, the first control chamber is connected to the ambient atmosphere and the second control chamber is connected to its associated supply member.
Claim 16
Dependent Claim
77 words
Apparatus according to claim 1, wherein said circuit means comprises another conduit means leading to said valve device, a single-acting relay valve interposed between said supply means and said valve device for connecting said other conduit means periodically to said supply means, portions of said relay valve defining a control chamber thereof, and reservoir means which is connected to an exhaust means, said supply means being connected to said control chamber by way of said reservoir means.
Claim 17
Dependent Claim
31 words
Apparatus according to claim 15, wherein said circuit means further comprises throttle means interposed between said supply means and said reservoir means and between said reservoir means and said exhaust means.
Claim 18
Dependent Claim
15 words
Apparatus according to claim 16, wherein said reservoir means exhausts to said other conduit means.
Claim 19
Dependent Claim
37 words
Apparatus according to claim 17, wherein said circuit means further comprises a conduit connecting said supply means to said relay valve, and a branch conduit leading from said conduit to said reservoir and containing said throttle means.
Claim 20
Dependent Claim
12 words
Apparatus according to claim 15, wherein said reservoir means exhausts to atmosphere.
Claim 21
Dependent Claim
39 words
Apparatus according to claim 16, wherein said throttle means comprises a first throttle controlling gas flow from said supply means to said reservoir means and a second throttle controlling gas flow from said reservoir means to said exhaust means.
Claim 22
Dependent Claim
100 words
Apparatus according to claim 20, wherein said circuit means further comprises second reservoir means, a second relay valve, and portions of said second relay valve defining a second control chamber thereof, said first throttle being connectable via said second reservoir means, said second relay valve, said second throttle and the first-mentioned reservoir means to said second control chamber, said first-mentioned reservoir means being connectable via said second throttle and said second relay valve to the ambient atmosphere, and said second relay valve being operable to connect said first-mentioned reservoir means to said second reservoir means and the ambient atmosphere, alterNately.
Claim 23
Dependent Claim
102 words
Apparatus according to claim 20, wherein said circuit means further comprises a second relay valve, a branch conduit, and portions of said second relay valve defining a second control chamber thereof, said supply means being connectable via said second relay valve and said first throttle to said reservoir means, said reservoir means being connectable via said second relay valve and the first and second throttles to the ambient atmosphere, and said second control chamber being connected via said branch conduit to said other conduit means and being operable to connect said reservoir means to said supply means and to ambient atmosphere, alternately.
Claim 24
Dependent Claim
11 words
Apparatus according to claim 16, wherein the throttle means is adjustable.
Claim 25
Dependent Claim
113 words
Apparatus according to claim 1, wherein said circuit means comprises a conduit connected downstream of said supply means and leading to said valve device, a first single-acting relay valve interposed between said supply means and said conduit and connecting said conduit periodically to said supply means, portions of said valve defining a first control chamber thereof, reservoir means connected to said first control chamber, a second single-acting relay valve interposed between said supply means and said reservoir means and periodically connecting said reservoir means to said supply means, portions of the second relay valve defining a second control chamber thereof, and a branch conduit connecting said second control chamber to the first-mentioned conduit.
Claim 26
Dependent Claim
42 words
Apparatus according to claim 24, wherein said circuit means further comprises throttle means interposed between said supply means and said reservoir means, said second relay valve communicating said reservoir means with exhaust, and with said supply means via said throttle means, alternately.
Claim 27
Dependent Claim
27 words
Apparatus according to claim 15, wherein said circuit means further comprises continuously open leak means by way of which said reservoir means is continuously connected to atmosphere.
Claim 28
Dependent Claim
195 words
Apparatus according to claim 26, wherein said circuit means further comprises a branch conduit containing said reservoir means and leading to said control chamber from a location downstream of said supply means and upstream of said relay valve, another single-acting relay valve connected in the branch conduit between said location, on the one hand, and said reservoir means and said leak means, on the other hand, a check valve connected in the branch conduit between said other single-acting relay valve on the one hand, and said reservoir means and said leak means, on the other hand, and permitting nutrient gas flow towards said reservoir means and said leak means, portions of said other single-acting relay valve defining a control chamber thereof, another branch conduit leading from said other conduit means to the latter control chamber, another reservoir means contained by said other branch conduit, another continuously open leak means by way of which said other reservoir means is continuously connected to atmosphere, and another check valve connected in said other branch conduit between said other conduit means, on the one hand, and said other reservoir means and the other leak means, on the other hand.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |