US3867936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anaesthetic gas safety equipment
Assignee: Shirley Aldred and Co Ltd
•
Filing: 1974-01-11
•
Granted: 1975-02-25
•
Expires: 1994-01-11
Abstract
Abstract To provide a safe environment for operating theatre occupants whilst anaesthetic gas is administered to a patient, exhaled gas from the patient is passed through a replaceable, mantransportable absorber unit to absorb the anaesthetic gas employed. The absorber unit comprises a cylindrically walled hollow drum having radial end walls; a central inlet in one end wall, the other end wall being provided with a plurality of angularly spaced apertures; a perforated retainer spaced inwardly from each end wall; and a predetermined fixed quantity of absorber material retained by and between the two perforated retainer plates, said material comprising carbon activated to absorb anaesthetic gas exhaled by the patient. In use, the weight of the absorber unit increases as exhaled anaesthetic gas is absorbed therein, and when the absorber unit attains a predetermined increased weight it is replaced by a fresh unit.
Inventors
- 👤 Donald Walter Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:39
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0087; A61M16/009; A61B; A61B90/00; A61M16/0093; Y; Y10; Y10S; Y10S55/00; Y10S55/33
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
Anaesthetic gas safety equipment comprising i. delivery means to administer anaesthetic gas to a patient, said delivery means having a gas inlet and a gas outlet, ii. a first flexible conduit having one end connected to said gas inlet, iii. anaesthetic gas supply means connected to the other end of said first flexible conduit, iv. a second flexible conduit having one end connected to said gas outlet, and v. a man-portable anaesthetic gas absorber unit comprising: a. a cylindrically walled hollow drum having radial end walls, b. a central inlet in one end wall releasably coupled to the other end of said second flexible conduit, the other end wall being provided with a plurality of angularly spaced apertures, c. a first perforated retainer sheet spaced inwardly from said one end wall, d. a second perforated retainer sheet adjacent said other end walL and between it and the first perforated retainer sheet, and e. a predetermined fixed quantity of absorber material between said first and second perforated retainer sheet and retained thereby, said material comprising carbon activated to absorb anaesthetic gas exhaled by the patient.
Claim 2
Dependent Claim
184 words
Anaesthetic gas safety equipment comprising i. delivery means to administer anaesthetic gas to a patient, said delivery means having a gas inlet and a gas outlet, ii. a first flexible conduit having one end connected to said gas inlet, iii. anaesthetic gas supply means connected to the other end of said first flexible conduit, iv. a second flexible conduit having one end connected to said gas outlet, and v. a man-portable anaesthetic gas absorber unit comprising: a. a cylindrically walled hollow drum having radial end walls, b. a central inlet in one end wall releasably coupled to the other end of said second flexible conduit, the other end wall being provided with a plurality of angularly spaced apertures, c. a first perforated retainer sheet spaced inwardly from said one end wall, d. a second perforated retainer sheet adjacent said other end walL and between it and the first perforated retainer sheet, and e. a predetermined fixed quantity of absorber material between said first and second perforated retainer sheet and retained thereby, said material comprising carbon activated to absorb anaesthetic gas exhaled by the patient.
Claim 3
Dependent Claim
45 words
Anaesthetic gas safety equipment according to claim 1, comprising a cylindrical, drum-support-skirt extending axially away from said other end wall in line with the cylindrical wall of said drum, said drum-support-skirt being apertured to permit passage therethrough of patient-exhaled gas now substantially free of anaesthetic.
Claim 4
Dependent Claim
22 words
Anaesthetic gas safety equipment according to claim 1, wherein said second perforated retainer sheet is spaced inwardly from said other end wall.
References Cited (Backward Citations)
US2099954A
Cited
US3183906A
Cited
US3315672A
Cited
US3555787A
Cited
US3577988A
Cited
US3615233A
Cited
US3814091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |