US3714941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical respirators
Assignee: Honeywell BV
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Filing: 1970-04-24
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Granted: 1973-02-06
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Expires: 1990-04-24
Abstract
Abstract A medical respirator in which gas is stored and passed to a patient in an adjustable predetermined time having switch means to control the flow of gas from a pressure source into a variable volume during the expiration period of the respirator and from the variable volume to the patient through restrictive means during inspiration period. The gas container is divided into two volumes separated by a movable member. Gas for the patient is expelled from the first volume, which is variable, by decrease of the first volume caused by movement of the movable member as a result of patient gas pressure in the second volume.
Inventors
- 👤 B Kipling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:55
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
367 words
A medical respirator comprising a patient gas container, a movable member within said container for dividing it into first and second volumes, said movable member being responsive to pressure acting thereon, said first volume arranged so as to be variable with the position of said movable member, first connection means connected to said first volume for passing patient gas therefrom to a patient during an inspiration period of the respirator, restrictive means within said first connection means for controlling the flow of gas to the patient, second connection means connected to said first volume and to a pressure source for providing patient gas to said first volume during an expiration period of said respirator, means within said second connection means for regulating the pressure of gas from said pressure source to said first volume, switching means arranged for connecting said first volume to the first or second connection means during inspiration or expiration periods of said respirator, automatic timing means connected to said switch means for causing switching operation thereof for cyclically changing the periods of the respirator between inspiratory and expiratory, third connection means connected with said switching means for connecting said pressure source to said second volume when said switching means is in one position during an inspiratory period, gas from the pressure source being supplied to said second volume during said inspiratory period so that said movable member will be displaced as a result of pressure of the gas in said second volume acting on said movable member so as to decrease said first volume, gas for the patient thereby being expelled from said first volume during at least part of the inspiration period as a result of the decrease of said first volume caused by movement of said moVable member, the ratio of the first volume to the second volume varying with the position of said movable member, said switching means being arranged for transferring gas which acted on said movable member for decreasing the capacity of said first volume, from the second volume, to the first volume when said switching means is in another position during the expiration period of the respirator said transferred gas to be expelled therefrom to a patient.
Claim 2
Dependent Claim
367 words
A medical respirator comprising a patient gas container, a movable member within said container for dividing it into first and second volumes, said movable member being responsive to pressure acting thereon, said first volume arranged so as to be variable with the position of said movable member, first connection means connected to said first volume for passing patient gas therefrom to a patient during an inspiration period of the respirator, restrictive means within said first connection means for controlling the flow of gas to the patient, second connection means connected to said first volume and to a pressure source for providing patient gas to said first volume during an expiration period of said respirator, means within said second connection means for regulating the pressure of gas from said pressure source to said first volume, switching means arranged for connecting said first volume to the first or second connection means during inspiration or expiration periods of said respirator, automatic timing means connected to said switch means for causing switching operation thereof for cyclically changing the periods of the respirator between inspiratory and expiratory, third connection means connected with said switching means for connecting said pressure source to said second volume when said switching means is in one position during an inspiratory period, gas from the pressure source being supplied to said second volume during said inspiratory period so that said movable member will be displaced as a result of pressure of the gas in said second volume acting on said movable member so as to decrease said first volume, gas for the patient thereby being expelled from said first volume during at least part of the inspiration period as a result of the decrease of said first volume caused by movement of said moVable member, the ratio of the first volume to the second volume varying with the position of said movable member, said switching means being arranged for transferring gas which acted on said movable member for decreasing the capacity of said first volume, from the second volume, to the first volume when said switching means is in another position during the expiration period of the respirator said transferred gas to be expelled therefrom to a patient.
Claim 3
Dependent Claim
367 words
A medical respirator comprising a patient gas container, a movable member within said container for dividing it into first and second volumes, said movable member being responsive to pressure acting thereon, said first volume arranged so as to be variable with the position of said movable member, first connection means connected to said first volume for passing patient gas therefrom to a patient during an inspiration period of the respirator, restrictive means within said first connection means for controlling the flow of gas to the patient, second connection means connected to said first volume and to a pressure source for providing patient gas to said first volume during an expiration period of said respirator, means within said second connection means for regulating the pressure of gas from said pressure source to said first volume, switching means arranged for connecting said first volume to the first or second connection means during inspiration or expiration periods of said respirator, automatic timing means connected to said switch means for causing switching operation thereof for cyclically changing the periods of the respirator between inspiratory and expiratory, third connection means connected with said switching means for connecting said pressure source to said second volume when said switching means is in one position during an inspiratory period, gas from the pressure source being supplied to said second volume during said inspiratory period so that said movable member will be displaced as a result of pressure of the gas in said second volume acting on said movable member so as to decrease said first volume, gas for the patient thereby being expelled from said first volume during at least part of the inspiration period as a result of the decrease of said first volume caused by movement of said moVable member, the ratio of the first volume to the second volume varying with the position of said movable member, said switching means being arranged for transferring gas which acted on said movable member for decreasing the capacity of said first volume, from the second volume, to the first volume when said switching means is in another position during the expiration period of the respirator said transferred gas to be expelled therefrom to a patient.
Claim 4
Dependent Claim
367 words
A medical respirator comprising a patient gas container, a movable member within said container for dividing it into first and second volumes, said movable member being responsive to pressure acting thereon, said first volume arranged so as to be variable with the position of said movable member, first connection means connected to said first volume for passing patient gas therefrom to a patient during an inspiration period of the respirator, restrictive means within said first connection means for controlling the flow of gas to the patient, second connection means connected to said first volume and to a pressure source for providing patient gas to said first volume during an expiration period of said respirator, means within said second connection means for regulating the pressure of gas from said pressure source to said first volume, switching means arranged for connecting said first volume to the first or second connection means during inspiration or expiration periods of said respirator, automatic timing means connected to said switch means for causing switching operation thereof for cyclically changing the periods of the respirator between inspiratory and expiratory, third connection means connected with said switching means for connecting said pressure source to said second volume when said switching means is in one position during an inspiratory period, gas from the pressure source being supplied to said second volume during said inspiratory period so that said movable member will be displaced as a result of pressure of the gas in said second volume acting on said movable member so as to decrease said first volume, gas for the patient thereby being expelled from said first volume during at least part of the inspiration period as a result of the decrease of said first volume caused by movement of said moVable member, the ratio of the first volume to the second volume varying with the position of said movable member, said switching means being arranged for transferring gas which acted on said movable member for decreasing the capacity of said first volume, from the second volume, to the first volume when said switching means is in another position during the expiration period of the respirator said transferred gas to be expelled therefrom to a patient.
Claim 5
Dependent Claim
41 words
The medical respirator according to claim 1 wherein said movable member comprises a piston movably mounted within said gas container for movement in one of two opposing directions to thereby vary the ratio of said first volume to said second volume.
Claim 6
Dependent Claim
79 words
The medical respirator according to claim 2 wherein said piston has two end faces, one of which forms a boundary of said first volume, and the other of which forms a boundary for said second volume, the surface areas of the two end faces being unequal so that said piston will be caused to move in the direction of the face having the smaller area when the pressures acting on the opposite end faces of said piston are equal.
Claim 7
Dependent Claim
53 words
The medical respirator according to claim 2 further comprising spring means attached to said piston for causing said piston to be displaced within said gas container when the force of pressure acting on one of said end faces is equal and opposite to the force of pressure acting on the other end face.
Claim 8
Dependent Claim
53 words
The medical respirator according to claim 1 wherein said restrictive means within said first connection comprises a variable restrictor to gas flow which is capable of adjustment so that the minimum pressure of the gas in said first volume during an inspiratory period is higher than the maximum pressure in the patient''s lungs.
Claim 9
Dependent Claim
71 words
The medical respirator according to claim 1 further comprising a pair of gas containers, each having a movable member therein defining first and second volumes, each of said first volumes being arranged to be variable, means for supplying patient gas to each of said variable volumes so that a mixture of patient gases is passed to the patient during each inspiration period, and means for controlling the proportions of said mixture.
Claim 10
Dependent Claim
37 words
The medical respirator according to claim 6 further comprising a pressure regulator connected to the first volume of each of said pair of gas containers for adjusting the respective proportions of the constituent gases in the mixture.
Claim 11
Dependent Claim
39 words
The medical respirator according to claim 7 further comprising means for adjusting the maximum volume of each gas in said variable volumes of each container, said maximum volume being dependent on the proportion of said gas in the mixture.
Claim 12
Dependent Claim
16 words
A medical respirator according to claim 1 wherein the movable member comprises at least one diaphragm.
Claim 13
Dependent Claim
28 words
A medical respirator according to claim 9 wherein the movable member comprises two parallel diaphragms arranged to move in unison at their centers and having different surface areas.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |