US3762408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilators
Assignee: BOC Group Ltd
•
Filing: 1971-11-11
•
Granted: 1973-10-02
•
Expires: 1991-11-11
Abstract
Abstract A lung ventilator which can control the flow rate of gas supplied to a patient so as to produce an increasing flow pattern, a constant flow pattern, or a decreasing flow pattern. The change from one flow pattern to another is effected solely by switching appropriate valves in the gas flow circuit of the ventilator.
Inventors
- 👤 L Cox
- 👤 D Dell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:07
CPC Classifications
A; A61; A61M; A61M16/00; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/87338; Y10T137/87539
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A lung ventilator including a path for the flow of gas to a patient; a first gas reservoir in the path, the path having therein upstream of the said reservoir an orifice of reduced cross-sectional area, a valved bypass path extending from upstream of the said orifice to immediately downstream of the reservoir, said bypass path having having an orifice therein downstream of said first reservoir and said bypass path, the downstream orifice being of larger cross-sectional area then the upstream orifice; a valve in the path between the bypass path and the downstream orifice; and a second gas reservoir, conduit means connecting said second reservoir to said bypass path, valve means in said conduit selectively connectable with the atmosphere or the path between the said valve and the downstream orifice.
Claim 2
Dependent Claim
131 words
A lung ventilator including a path for the flow of gas to a patient; a first gas reservoir in the path, the path having therein upstream of the said reservoir an orifice of reduced cross-sectional area, a valved bypass path extending from upstream of the said orifice to immediately downstream of the reservoir, said bypass path having having an orifice therein downstream of said first reservoir and said bypass path, the downstream orifice being of larger cross-sectional area then the upstream orifice; a valve in the path between the bypass path and the downstream orifice; and a second gas reservoir, conduit means connecting said second reservoir to said bypass path, valve means in said conduit selectively connectable with the atmosphere or the path between the said valve and the downstream orifice.
Claim 3
Dependent Claim
30 words
A lung ventilator as claimed in claim 1 including a valved diversion path extending from the second reservoir to the flow path between the said valve and the downstream orifice.
Claim 4
Dependent Claim
18 words
A lung ventilator as claimed in claim 2 including a two-position, three-port valve located in the diversion path.
Claim 5
Dependent Claim
22 words
A lung ventilator as claimed in claim 1 in which the cross-sectional area of at least one of the orifices is adjustable.
Claim 6
Dependent Claim
22 words
A lung ventilator as claimed in claim one in which the internal volume of at least one of the reservoirs is adjustable.
Claim 7
Dependent Claim
27 words
A lung ventilator as claimed in claim 1 including a plurality of orifices in which each orifice is able to be switched selectively into its operational position.
Claim 8
Dependent Claim
27 words
A lung ventilator as claimed in claim 1 including a plurality of reservoirs in which each reservoir is able to be switched selectively into its operational position.
References Cited (Backward Citations)
US3471674A
Cited
US3672366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |