Patent EP0117699A2 successfully refreshed from Google Patents.
EP0117699A2
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Gas mixing & flow smoothing apparatus
Assignee: Penlon Ltd
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Filing: 1984-02-20
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Granted: —
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Expires: 2004-02-20
Abstract
Abstract Gas mixing and flow smoothing apparatus for use in for example an anaesthesia system comprises a mixing chamber (8) which receives the flow of two or more gases via control valves (6, 7). The mixing chamber (8) is adapted to absorb fluctuations in the pressure of the gases therein through the provision of for example a spring-loaded piston (not shown) which forms one wall of the chamber, and the pressure at the outlet (30) from the chamber (8) is maintained at a substantially constant pressure by means of a valve (9). If desired, further attenuation of the gas flow may be achieved through the provision of a second series arrangement of surge damper (11) and back pressure valve (10) located downstream from the valve (9).
Inventors
- 👤 Clive Edward Winston Hahn
- 👤 Basil Raymond Sugg
- 👤 Eileen Palayiwa
- 👤 Paul John Tyrell
- 👤 David John Lindsay-Scott
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/12; A61M16/20; A61M16/201; A61M16/202; A61M16/208; A61M16/209; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87652; Y10T137/87676; Y10T137/87684
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
61 words
Apparatus for mixing and smoothing the flow of two or more gases, comprising a mixing chamber with at least two inlet ducts and an outlet duct, the mixing chamber being adapted to absorb fluctuations in the pressure of the gases therein, and a valve connected downstream of the chamber adapted to maintain a substantially constant pressure at said chamber outlet duct.
Claim 2
Dependent Claim
61 words
Apparatus for mixing and smoothing the flow of two or more gases, comprising a mixing chamber with at least two inlet ducts and an outlet duct, the mixing chamber being adapted to absorb fluctuations in the pressure of the gases therein, and a valve connected downstream of the chamber adapted to maintain a substantially constant pressure at said chamber outlet duct.
Claim 3
Dependent Claim
31 words
Apparatus as claimed in claim 1 wherein the mixing chamber is cylindrical in cross-section and said inlet ducts are arranged such that the gases enter the chamber tangentially in opposite directions.
Claim 4
Dependent Claim
36 words
Apparatus as claimed in claim 1 or 2 wherein said mixing chamber includes a spring loaded piston defining a wall thereof such piston being outwardly displaceable in response to increases in gas pressure within the chamber.
Claim 5
Dependent Claim
15 words
Apparatus as claimed in claim 3 comprising a flexible rolling diaphragm seal adjacent the piston.
Claim 6
Dependent Claim
26 words
Apparatus as claimed in any preceding claim wherein the value adapted to maintain a substantially constant pressure at the chamber outlet comprises a variable orifice value.
Claim 7
Dependent Claim
29 words
Apparatus as claimed in claim 5 wherein said valve includes a gravity loaded plunger or float slidably mounted in a vertically disposed, tapered passage through which the gases flow.
Claim 8
Dependent Claim
31 words
Apparatus as claimed in claim 6 wherein the float or plunger includes angled slots or channels around its periphery such that the flow of gas thereby produces a rotational torque thereon.
Claim 9
Dependent Claim
33 words
Apparatus as claimed in any of claims 5 to 7 wherein the value has associateed therewith means for measuring displacements of said float or plunger which are indicative of the gas flow rate.
Claim 10
Dependent Claim
49 words
Apparatus as claimed in claim 8 wherein the float or plunger mounts a ferromagnetic rod which extends to and is movable within an electrical coil means such that changes in inductance of said coil means are indicative of displacements of the rod and thus of the float or plunger.
Claim 11
Dependent Claim
35 words
Apparatus as claimed in any preceding claim further comprising a surge damper and back-pressure valve arranged in series downstream from said valve adapted to maintain a substantially constant pressure at the mixing chamber outlet duct.
Claim 12
Dependent Claim
49 words
ll. Apparatus as claimed in claim 10 wherein said surge damper comprises a chamber which is cylindrical in cross-section and a spring loaded piston defining a wall of the chamber, the surge damper and the mixing chamber being mounted in back-to-back relationship with a central connecting plate disposed therebetween.
Claim 13
Dependent Claim
22 words
Apparatus as claimed in claim 11 wherein gases are transmitted to and from the chambers via conduits formed in the connecting plate.
Claim 14
Dependent Claim
11 words
An anaesthesia system including apparatus as claimed in any preceding claim.
Claim 15
Independent Claim
64 words
A method of mixing and smoothing the flow of two or more gases comprising introducing the gases into an enclosed mixing chamber, the mixing chamber being adapted to absorb fluctuations in the pressure of the gases therein, and passing the mixed gases through a valve located downstream of the mixing chamber adapted to maintain a subtantially constant pressure at the outlet of said chamber.
Claim 16
Independent Claim
64 words
A method of mixing and smoothing the flow of two or more gases comprising introducing the gases into an enclosed mixing chamber, the mixing chamber being adapted to absorb fluctuations in the pressure of the gases therein, and passing the mixed gases through a valve located downstream of the mixing chamber adapted to maintain a subtantially constant pressure at the outlet of said chamber.
Claim 17
Dependent Claim
83 words
Gas supply apparatus for an anaesthesia system comprising two or more pulsed valves adapted to produce regulated flows of two or more gases, a mixing chamber downstream of the valves in which the gases are mixed, surge damper means and back pressure valve means for attenuating pulses in the mixed gas flow, means for directing a controlled proportion of the total gas flow to anaesthetic drug dosing means, and a second mixing chamber for remixing the dosed gases with the main gas flow.
Claim 18
Dependent Claim
83 words
Gas supply apparatus for an anaesthesia system comprising two or more pulsed valves adapted to produce regulated flows of two or more gases, a mixing chamber downstream of the valves in which the gases are mixed, surge damper means and back pressure valve means for attenuating pulses in the mixed gas flow, means for directing a controlled proportion of the total gas flow to anaesthetic drug dosing means, and a second mixing chamber for remixing the dosed gases with the main gas flow.
Claim 19
Dependent Claim
31 words
Gas supply apparatus as claimed in claim 15 wherein outlet orifices or jets of the respective pulsed values are mounted so as to be in good thermal communication with one another.
Claim 20
Dependent Claim
40 words
Apparatus as claimed in claim 16 wherein the mixing chamber and a surge damping chamber are mounted in back-to-back relationship with a connecting plate disposed therebetween, said outlet orifices or jets being located in orifices formed in said connecting plate.
Claim 21
Dependent Claim
22 words
Apparatus as claimed in any of claims 15 to 17 wherein the components are mounted on a common mounting plate or tray.
References Cited (Backward Citations)
No citation records indexed.
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