EP0093542A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for producing pulses in liquid
Assignee: Kuraray Co Ltd
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Filing: 1983-04-20
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Granted: —
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Expires: 2003-04-20
Abstract
Abstract An apparatus for supplying liquid in pulses by means of a roller pump (1) into a membrane unit (30) having membranes provided therein in such a way that liquid is introduced in a pulsed state into the membrane unit (30) by periodically opening and closing a flow path by means of a valve (2) disposed in the flow path (11) on the inlet side or outlet side of the membrane unit (30). The resistance of the membranes to material transfer is reduced and liquid chanelling into the membrane unit is reasonably avoided, so that the effective are of each membrane may be increased. The apparatus can be advantageously employed to improve the performance of various blood treating and body cavity fluid treating apparatuses incorporating membranes.
Inventors
- 👤 Kenji Kubota
- 👤 Kouji Fukunaga
- 👤 Yasuzo Kirita
- 👤 Hidemune Naito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 04:19
CPC Classifications
B; B01; B01D; B01D65/00; B01D65/08; A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M60/00; A61M60/10; A61M60/104; A61M60/109; A61M60/113; A61M60/20; A61M60/247; A61M60/253; A61M60/268; A61M60/279; A61M60/30; A61M60/36; A61M60/37; A61M60/50; A61M60/508; A61M60/538; A61M60/554; A61M60/80; A61M60/845; A61M60/851; A61M60/853; B01D2313/00; B01D2313/08; B01D2313/18; B01D2313/24; B01D2313/243; B01D2313/90; B01D2313/903; B01D2321/00; B01D2321/20; B01D2321/2066
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
An apparatus for producing pulses in liquid, comprising a roller pump (1), a membrane unit (30) incorporating membranes, a valve (2) for opening and closing a flow path (11) of the liquid being transferred by the pump, start-pressure signalling means (3) for intermittently producing a close-valve signal to said valve (2), a synchronous monitor circuit (5) for converting the period of such signal into a voltage value or pulse number, a pressure-period setting circuit (8) for setting a pressure period correlated to the period of said start-pressure signal, and a comparator circuit (9) for continually transmitting the close-valve signal until an integrated voltage or pulse number since the start of pressure application concurs with the monitored value at said monitor circuit (5).
Claim 2
Independent Claim
122 words
An apparatus for producing pulses in liquid, comprising a roller pump (1), a membrane unit (30) incorporating membranes, a valve (2) for opening and closing a flow path (11) of the liquid being transferred by the pump, start-pressure signalling means (3) for intermittently producing a close-valve signal to said valve (2), a synchronous monitor circuit (5) for converting the period of such signal into a voltage value or pulse number, a pressure-period setting circuit (8) for setting a pressure period correlated to the period of said start-pressure signal, and a comparator circuit (9) for continually transmitting the close-valve signal until an integrated voltage or pulse number since the start of pressure application concurs with the monitored value at said monitor circuit (5).
Claim 3
Dependent Claim
59 words
An apparatus for producing pulses in liquid as claimed in claim 1, which said start-pressure signalling means (3) comprise a rotatable plate 14 mounted on a rotatable shaft of the roller pump (1) and having magnets (16') provided thereon, and a proximity switch (16) provided on a plate 15 removably attached to a rotary guide of the pump (1).
Claim 4
Dependent Claim
32 words
An apparatus for producing pulses in liquid as claimed in claim 1 or claim 2, in which said valve (2) for opening and closing said flow path (11) is a pinch valve.
Claim 5
Independent Claim
57 words
An apparatus for producing pulses in liquid as claimed in any preceding claim, in which said synchronous monitor circuit (5) comprises a circuit (6) for converting the period of said start-pressure input signal into a voltage value or pulse number, and a memory circuit (7) for storing a maximal value of those converted at said circuit (6).
References Cited (Backward Citations)
No citation records indexed.
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