Patent US3557785A successfully refreshed from Google Patents.
US3557785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas administration apparatus
Assignee: Dow Chemical Co
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Filing: 1968-02-28
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Granted: 1971-01-26
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Expires: 1988-02-28
Abstract
Abstract The invention provides an apparatus for administration of gases to animals for purposes such as anesthesia, the administration apparatus comprising a first constant-volume subchamber and a second variable-volume subchamber, the volume of the second subchamber varying in response to changes in the constant-volume subchamber pressure, with means for varying the volume of the second subchamber in response to gas pressure changes in the first subchamber and means for placing an animal in respiratory communication with the first subchamber. The device is adapted to be connected to a closed system intermittent gas source device of a conventional type. The chamber is adapted for administration of gases to animals independently of their tidal volume or respiration rate.
Inventors
- 👤 William D Mcqueen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
A; A61; A61M; A61M16/00; A61M2250/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
An apparatus for administration of gases to animals independently of their tidal volume or respiration rate, the apparatus comprising: a constant-volume subchamber of animal receiving dimensions; a variable-volume subcHamber communicably coupled thereto; an intermittent gas supply system communicably coupled to the constant-volume subchamber and adapted for cyclic operation between a high pressure phase and a low pressure phase; means for placing an animal within the constant-volume subchamber to provide respiratory communication between the animal and the constant-volume subchamber, said means comprising a removable wall of the constant-volume subchamber; actuator means in operative engagement with the variable-volume subchamber for urging said subchamber between a minimum and maximum volume in response to the high and low pressure phases of the intermittent gas supply system; and the expansion volume of the variable-volume subchamber being at least as great as the volume of gas breathed by an animal during the low pressure phase of the intermittent gas supply system.
Claim 2
Independent Claim
155 words
An apparatus for administration of gases to animals independently of their tidal volume or respiration rate, the apparatus comprising: a constant-volume subchamber of animal receiving dimensions; a variable-volume subcHamber communicably coupled thereto; an intermittent gas supply system communicably coupled to the constant-volume subchamber and adapted for cyclic operation between a high pressure phase and a low pressure phase; means for placing an animal within the constant-volume subchamber to provide respiratory communication between the animal and the constant-volume subchamber, said means comprising a removable wall of the constant-volume subchamber; actuator means in operative engagement with the variable-volume subchamber for urging said subchamber between a minimum and maximum volume in response to the high and low pressure phases of the intermittent gas supply system; and the expansion volume of the variable-volume subchamber being at least as great as the volume of gas breathed by an animal during the low pressure phase of the intermittent gas supply system.
Claim 3
Dependent Claim
30 words
The apparatus of Claim 1 wherein the ratio of the expansion volume of the variable-volume subchamber to the volume of the constant-volume subchamber is at least about 1 to 40.
Claim 4
Dependent Claim
53 words
The apparatus of claim 1 wherein the variable-volume subchamber is disposed upstream of the constant-volume subchamber with respect to the gas flow therethrough and the actuator means is adapted to permit expansion of the variable-volume subchamber to a maximum volume when the gas pressure in the apparatus is at a predetermined high pressure.
Claim 5
Dependent Claim
180 words
A gas administration apparatus comprising: a constant-volume subchamber having first and second ends; access means on said subchamber for providing respiratory communication between an animal and the constant-volume subchamber; connecting means for providing communication between the variable-volume subchamber and the first end of the constant-volume subchamber; actuator means in operative engagement with the variable-volume subchamber for urging said subchamber between maximum and minimum volumes in response to changes in gas pressure in the apparatus, the expansion volume of the variable-volume subchamber being at least about one-fortieth the volume of the constant-volume subchamber; first coupling means in the connecting means; second coupling means in the second end of the constant-volume subchamber; and an intermittent gas supply system having an input line and an exhaust line the input line being coupled to the first coupling means and the exhaust line being coupled to the second coupling means to provide gas flow through the constant-volume subchamber. the connecting means and the second coupling means being movable with respect to each other to provide a plurality of gas flow paths through the constant-volume subchamber.
Claim 6
Dependent Claim
180 words
A gas administration apparatus comprising: a constant-volume subchamber having first and second ends; access means on said subchamber for providing respiratory communication between an animal and the constant-volume subchamber; connecting means for providing communication between the variable-volume subchamber and the first end of the constant-volume subchamber; actuator means in operative engagement with the variable-volume subchamber for urging said subchamber between maximum and minimum volumes in response to changes in gas pressure in the apparatus, the expansion volume of the variable-volume subchamber being at least about one-fortieth the volume of the constant-volume subchamber; first coupling means in the connecting means; second coupling means in the second end of the constant-volume subchamber; and an intermittent gas supply system having an input line and an exhaust line the input line being coupled to the first coupling means and the exhaust line being coupled to the second coupling means to provide gas flow through the constant-volume subchamber. the connecting means and the second coupling means being movable with respect to each other to provide a plurality of gas flow paths through the constant-volume subchamber.
Claim 7
Dependent Claim
47 words
The apparatus of claim 4 wherein the variable-volume subchamber and actuator means comprise a bellows adapted to expand in response to an increase in gas pressure and a weight disposed against the bellows and adapted to compress the bellows in response to a decrease in gas pressure.
Claim 8
Independent Claim
143 words
An apparatus for administration of gases to animals adapted for use with an intermittent gas supply system, the apparatus comprising; a constant-volume subchamber of animal receiving dimensions, said constant-volume subchamber having a removable wall to permit introduction of an animal into said subchamber; means comprising the removable wall of the constant-volume subchamber for providing respiratory communication between an animal and said subchamber; a variable-volume subchamber in communication with the constant-volume subchamber; actuator means in operative engagement with the variable-volume subchamber for urging said subchamber between a minimum and a maximum volume in response to changes in gas pressure in the apparatus, the expansion volume of the variable-volume subchamber being at least one-fortieth the volume of the constant-volume subchamber; and first and second coupling means for communicably coupling the apparatus to the intermittent gas supply system to provide gaS flow through the constant-volume subchamber.
Claim 9
Independent Claim
143 words
An apparatus for administration of gases to animals adapted for use with an intermittent gas supply system, the apparatus comprising; a constant-volume subchamber of animal receiving dimensions, said constant-volume subchamber having a removable wall to permit introduction of an animal into said subchamber; means comprising the removable wall of the constant-volume subchamber for providing respiratory communication between an animal and said subchamber; a variable-volume subchamber in communication with the constant-volume subchamber; actuator means in operative engagement with the variable-volume subchamber for urging said subchamber between a minimum and a maximum volume in response to changes in gas pressure in the apparatus, the expansion volume of the variable-volume subchamber being at least one-fortieth the volume of the constant-volume subchamber; and first and second coupling means for communicably coupling the apparatus to the intermittent gas supply system to provide gaS flow through the constant-volume subchamber.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |