US3850170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen powered volume cycled respirator with oxygen air mix
Assignee: United States Department of the Army
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Filing: 1972-07-26
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Granted: 1974-11-26
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Expires: 1992-07-26
Abstract
Abstract A solely oxygen-powered respirator using oxygen-powered controls and an oxygen-powered driving mechanism, the flueric controls cyclically controlling the driving mechanism through a four-way, two position interface valve. The flueric controls include overpressure and inspiratory sensing at the patient to interrupt the basic volume cycle.
Inventors
- 👤 L Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:37
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0057; A61M16/0075; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/212; Y10T137/2125
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
342 words
An oxygen-powered respirator utilizing only pressurized oxygen as its power source, said respirator comprising: a. means for supplying oxygen to power said respirator and mixing a predetermined percentage of said oxygen with air to form breathing gas; b. delivery means having a delivery stroke and a refill stroke for supplying a predetermined amount of said breathing gas to a patient; and c. control means operatively associated with said pressurized oxygen power source and said delivery means and adapted to cyclically and reciprocally stroke said delivery means to provide said breathing gas to a patient during alternate predetermined periods of an inspiratory cycle, said control means comprising: 1. fluid amplifier means and interface valve means, said fluid amplifier means being operatively associated with and controlled in whole or in part by said delivery means and adapted to activate said interface valve means to reciprocally stroke said delivery means; 2. first Schmitt trigger means adapted to control said fluid amplifier means together with said delivery means, said first Schmitt trigger means including means for receiving a predetermined allowable overpressure setting, means for sensing the pressure of said breathing gas at the patient, and means for providing a first output signal whenever said sensed pressure at the patient exceeds said predetermined allowable pressure setting, said first output signal causing said fluid amplifier means to activate said interface valve means to interrupt the delivery stroke and to commence the refill stroke of said delivery means; and 3. second Schmitt trigger means adapted to control said fluid amplifier means together with said delivery means and said first Schmitt trigger means, said second Schmitt trigger meAns including means for receiving a predetermined inspiratory pressure setting, means for sensing the inspiratory pressure of said breathing gas at the patient and means for providing a second output signal whenever said sensed inspiratory pressure drops below said predetermined inspiratory pressure setting, said second output signal causing said fluid amplifier means to activate said interface valve means to interrupt the refill stroke and to commence the delivery stroke of said delivery means.
Claim 2
Dependent Claim
342 words
An oxygen-powered respirator utilizing only pressurized oxygen as its power source, said respirator comprising: a. means for supplying oxygen to power said respirator and mixing a predetermined percentage of said oxygen with air to form breathing gas; b. delivery means having a delivery stroke and a refill stroke for supplying a predetermined amount of said breathing gas to a patient; and c. control means operatively associated with said pressurized oxygen power source and said delivery means and adapted to cyclically and reciprocally stroke said delivery means to provide said breathing gas to a patient during alternate predetermined periods of an inspiratory cycle, said control means comprising: 1. fluid amplifier means and interface valve means, said fluid amplifier means being operatively associated with and controlled in whole or in part by said delivery means and adapted to activate said interface valve means to reciprocally stroke said delivery means; 2. first Schmitt trigger means adapted to control said fluid amplifier means together with said delivery means, said first Schmitt trigger means including means for receiving a predetermined allowable overpressure setting, means for sensing the pressure of said breathing gas at the patient, and means for providing a first output signal whenever said sensed pressure at the patient exceeds said predetermined allowable pressure setting, said first output signal causing said fluid amplifier means to activate said interface valve means to interrupt the delivery stroke and to commence the refill stroke of said delivery means; and 3. second Schmitt trigger means adapted to control said fluid amplifier means together with said delivery means and said first Schmitt trigger means, said second Schmitt trigger meAns including means for receiving a predetermined inspiratory pressure setting, means for sensing the inspiratory pressure of said breathing gas at the patient and means for providing a second output signal whenever said sensed inspiratory pressure drops below said predetermined inspiratory pressure setting, said second output signal causing said fluid amplifier means to activate said interface valve means to interrupt the refill stroke and to commence the delivery stroke of said delivery means.
Claim 3
Dependent Claim
94 words
first Schmitt trigger means adapted to control said fluid amplifier means together with said delivery means, said first Schmitt trigger means including means for receiving a predetermined allowable overpressure setting, means for sensing the pressure of said breathing gas at the patient, and means for providing a first output signal whenever said sensed pressure at the patient exceeds said predetermined allowable pressure setting, said first output signal causing said fluid amplifier means to activate said interface valve means to interrupt the delivery stroke and to commence the refill stroke of said delivery means; and
Claim 4
Dependent Claim
94 words
first Schmitt trigger means adapted to control said fluid amplifier means together with said delivery means, said first Schmitt trigger means including means for receiving a predetermined allowable overpressure setting, means for sensing the pressure of said breathing gas at the patient, and means for providing a first output signal whenever said sensed pressure at the patient exceeds said predetermined allowable pressure setting, said first output signal causing said fluid amplifier means to activate said interface valve means to interrupt the delivery stroke and to commence the refill stroke of said delivery means; and
Claim 5
Dependent Claim
17 words
A respirator as in claim 1 wherein said interface valve means is a four-way, two position valve.
Claim 6
Dependent Claim
61 words
A respirator as in claim 1 wherein said control means additionally includes a time delay means which causes said fluid amplifier to pause a predetermined amount of time before activating said interface valve means to cause a delivery stroke at the conclusion of said refill stroke, said second trigger means adapted to override said delay upon sensing inspiration at the patient.
Claim 7
Dependent Claim
99 words
second Schmitt trigger means adapted to control said fluid amplifier means together with said delivery means and said first Schmitt trigger means, said second Schmitt trigger meAns including means for receiving a predetermined inspiratory pressure setting, means for sensing the inspiratory pressure of said breathing gas at the patient and means for providing a second output signal whenever said sensed inspiratory pressure drops below said predetermined inspiratory pressure setting, said second output signal causing said fluid amplifier means to activate said interface valve means to interrupt the refill stroke and to commence the delivery stroke of said delivery means.
Claim 8
Dependent Claim
99 words
second Schmitt trigger means adapted to control said fluid amplifier means together with said delivery means and said first Schmitt trigger means, said second Schmitt trigger meAns including means for receiving a predetermined inspiratory pressure setting, means for sensing the inspiratory pressure of said breathing gas at the patient and means for providing a second output signal whenever said sensed inspiratory pressure drops below said predetermined inspiratory pressure setting, said second output signal causing said fluid amplifier means to activate said interface valve means to interrupt the refill stroke and to commence the delivery stroke of said delivery means.
Claim 9
Dependent Claim
28 words
A respirator as in claim 1 including a relief valve means associated with said oxygen supply means and adapted to prevent a pressure build-up beyond a predetermined amount.
Claim 10
Dependent Claim
17 words
A respirator as in claim 4 and including a bladder means for the temporary storage of oxygen.
Claim 11
Dependent Claim
46 words
A respirator as in claim 1 wherein said delivery means includes a bellows in communication with said mixing means, check valve means adapted to admit said breathing gas mixture into said bellows upon said refill stroke and deliver it to a patient during said delivery stroke.
Claim 12
Dependent Claim
57 words
A respirator as in claim 6 wherein said delivery means additionally includes a double acting cylinder and piston means, said piston means being operatively connected to said bellows, said interface valve means adapted to provide pressurized oxygen to said double acting cylinder means to power said piston means and said bellows in alternative delivery and refill strokes.
Claim 13
Dependent Claim
50 words
A respirator as in claim 1 and including a pair of excursion trigger means associated with said delivery means and adapted to cause said control means to cause said delivery means to change from a refill stroke to a delivery stroke at the end of said refill stroke and vice-versa.
Claim 14
Dependent Claim
52 words
A respirator as in claim 1 wherein said fluid amplifier means has four input signal receiving means for receiving said first and second output signals from said first and second Schmitt trigger means and for receiving two signals from said delivery means indicative of the commencement and termination of the delivery stroke.
Claim 15
Dependent Claim
35 words
A respirator as in claim 1 wherein said first and second Schmitt triggers are directly connected to said fluid amplifier so that said first and second output signals are delivered directly to said fluid amplifier.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |