Patent US3841560A successfully refreshed from Google Patents.
US3841560A
Expired / Lapsed
US
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Anesthetic vaporizer
Assignee: Airco Inc
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Filing: 1973-07-16
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Granted: 1974-10-15
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Expires: 1993-07-16
Abstract
Abstract An anesthetic vaporizer is disclosed having a linear flow system which insures precise predictability of the desired anesthetic composition. The total flow into the vaporizer is divided into two main gas streams, the first gas stream proceeds through precise linear flow restrictors and is then subdivided into two gas substreams by a concentration valve. One of the substreams is directed by the concentration valve through a vaporizing chamber where it becomes saturated with anesthetic and then to the vaporizer outlet. The other substream is channeled past the concentration valve directly to the vaporizer outlet where it is reunited with the one substream. By adjusting the concentration valve, the ratio of the substreams may be changed, thus affecting the eventual concentration of the anesthetic composition from the vaporizer outlet. The second main gas stream proceeds through a thermal compensation valve and is subdivided into two substreams, one of which is directed through fixed linear flow restrictors to the vaporizer outlet, and the other substream is directed through a variable thermal bypass also having linear flow restrictors. The flow through the variable thermal bypass to the vaporizer outlet is varied in accordance with the sensed temperature in the anesthetic vaporizing chamber. A feature of the vaporizer is the use of unique precise linear flow restrictors in every path of flow through the vaporizer so that a predictable anesthetic concentration is obtained and overall linear response is achieved despite variables occuring during operation of the vaporizer.
Inventors
- 👤 U Sielaff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:57
CPC Classifications
A; A61; A61M; A61M11/00; A61M11/02; A61M16/00; A61M16/10; A61M16/14; A61M16/18; Y; Y10; Y10S; Y10S261/00; Y10S261/65
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
An anesthetic vaporizer apparatus, comprising in combination: a vaporizer housing having a main gas inlet and a main gas-vapor outlet, a bypass passageway communicating between said gas inlet and said gas outlet, a vaporizing chamber in said housing for containing liquid anesthetic and adapted to saturate gas passing through said vaporizing chamber with anesthetic vapor, vaporizing passage means adapted to direct a portion of gas from said main inlet through said vaporizing chamber to said outlet, thermal bypass passageway communicating between said gas inlet and said gas outlet and adapted to control the flow of gas through said thermal bypass passageway in accordance with the temperature within said vaporizing chamber, linear flow restrictors in each of said vaporizing passage means and thermal bypass passageway, said linear flow restrictors comprising a plurality of minute capillary passages adapted to maintain a linear relationship between the gas flow and pressure drop across said flow restrictors.
Claim 2
Dependent Claim
152 words
An anesthetic vaporizer apparatus, comprising in combination: a vaporizer housing having a main gas inlet and a main gas-vapor outlet, a bypass passageway communicating between said gas inlet and said gas outlet, a vaporizing chamber in said housing for containing liquid anesthetic and adapted to saturate gas passing through said vaporizing chamber with anesthetic vapor, vaporizing passage means adapted to direct a portion of gas from said main inlet through said vaporizing chamber to said outlet, thermal bypass passageway communicating between said gas inlet and said gas outlet and adapted to control the flow of gas through said thermal bypass passageway in accordance with the temperature within said vaporizing chamber, linear flow restrictors in each of said vaporizing passage means and thermal bypass passageway, said linear flow restrictors comprising a plurality of minute capillary passages adapted to maintain a linear relationship between the gas flow and pressure drop across said flow restrictors.
Claim 3
Dependent Claim
73 words
An anesthetic vaporizing apparatus as defined in claim 1 whereiin said capillary passages further comprise inner and outer annular rings, an annular thin metallic ring of stock being compressed between said inner and outer rings, said metallic ring having narrow, parallel axially disposed slots, and inlet and outlet means for providing gas flow into one end and from the other end of said slots for providing a continual flow path through said slots.
Claim 4
Dependent Claim
154 words
An anesthetic vaporizer apparatus, comprising in combination: a vaporizer housing having a main gas inlet and a main gas-vapor outlet, a bypass passageway communicating between said gas inlet and said gas outlet, a vaporizing chamber in said housing for containing liquid anesthetic and adapted to saturate gas passing through said vaporizing chamber with anesthetic vapor, vaporizing passage means adapted to direct a portion of gas from said main inlet through said vaporizing chamber to said outlet, thermal bypass passageway communicating between said gas inlet and said gas outlet and adapted to control the flow of gas through said thermal bypass passageway in accordance with the temperature within said vaporizing chamber, linear flow restrictors in each of said bypass passageway, vaporizing passage means and thermal bypass passageway, said linear flow restrictors comprising a plurality of minute capillary passages adapted to maintain a linear relationship between the gas flow and pressure drop across said flow restrictors.
Claim 5
Dependent Claim
154 words
An anesthetic vaporizer apparatus, comprising in combination: a vaporizer housing having a main gas inlet and a main gas-vapor outlet, a bypass passageway communicating between said gas inlet and said gas outlet, a vaporizing chamber in said housing for containing liquid anesthetic and adapted to saturate gas passing through said vaporizing chamber with anesthetic vapor, vaporizing passage means adapted to direct a portion of gas from said main inlet through said vaporizing chamber to said outlet, thermal bypass passageway communicating between said gas inlet and said gas outlet and adapted to control the flow of gas through said thermal bypass passageway in accordance with the temperature within said vaporizing chamber, linear flow restrictors in each of said bypass passageway, vaporizing passage means and thermal bypass passageway, said linear flow restrictors comprising a plurality of minute capillary passages adapted to maintain a linear relationship between the gas flow and pressure drop across said flow restrictors.
Claim 6
Dependent Claim
73 words
An anesthetic vaporizing apparatus as defined in claim 3 wherein said capillary passages further comprise inner and outer annular rings, an annular thin metallic ring of stock being compressed between said inner and outer rings, said metallic ring having narrow, parallel axially disposed slots, and inlet and outlEt means for providing gas flow into one end and from the other end of said slots for providing a continual flow path through said slots.
Claim 7
Dependent Claim
34 words
An anesthetic vaporizer apparatus as defined in claim 3 further including a concentration valve means adapted to selectively vary the proportion of main gas directed through said bypass passageway and said vaporizing passage means.
Claim 8
Dependent Claim
44 words
An anesthetic vaporizing apparatus as defined in claim 3 wherein said thermal bypass passageway comprises a plurality of individual passages, each having a valve, each said valve means being individually operated to open or close in accordance with the temperature within said vaporizer chamber.
Claim 9
Dependent Claim
40 words
An anesthetic vaporizing apparatus as defined in claim 6 including temperature detecting means in said vaporizing chamber and actuating means connected to said detecting means for individually operating said valves in accordance with the temperature detected within said vaporizing chamber.
Claim 10
Dependent Claim
82 words
An anesthetic vaporizing apparatus as defined in claim 7 wherein each said valve comprises a ball normally closing each such individual passage and said actuating means comprises a plurality of valve stems of differing length, each of which is adapted to be raised to lift a corresponding individual ball to open each such individual passage, and a common operating member adapted to move said plurality of valve stems a predetermined distance in response to a change in temperature within said vaporizing chamber.
References Cited (Backward Citations)
US2886689A
Cited
US3559886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |