Title:
VARIABLE FLOW RESISTANCE ELEMENT
Document Type and Number:
WIPO Patent Application WO/2004/046563
Kind Code:
A1
Abstract:
The invention relates to a variable flow resistance element comprising a fluid inlet (20), a fluid outlet (22) and a closed fluid conduit (16) of a fixed length, which connects the fluid inlet (20) to the fluid outlet (22), allowing the passage of said fluid. Said element also comprises a unit for varying the flow cross-section of the fluid conduit (16) over a predetermined length of said conduit, in order to adjust the flow resistance that is defined by the fluid conduit. The ratio of the predetermined length of the fluid conduit (16) to the characteristic diameter of said conduit is > 500 and the unit for varying the flow cross-section is configured to exert an external pressure on wall sections of the fluid conduit, said pressure being independent of the pressure of a medium in the fluid conduit.
Inventors:
GOETTSCHE THORSTEN (DE)
KOHNLE JOERG (DE)
ERNST HERBERT (DE)
KOHNLE JOERG (DE)
ERNST HERBERT (DE)
Application Number:
PCT/EP2003/013120
Publication Date:
June 03, 2004
Filing Date:
November 21, 2003
Export Citation:
Assignee:
HAHN SCHICKARD GES (DE)
GOETTSCHE THORSTEN (DE)
KOHNLE JOERG (DE)
ERNST HERBERT (DE)
GOETTSCHE THORSTEN (DE)
KOHNLE JOERG (DE)
ERNST HERBERT (DE)
International Classes:
F15C5/00; F16K99/00; (IPC1-7): F15C3/04; F16K7/04
Foreign References:
| US5660728A | 1997-08-26 | |||
| US20020166585A1 | 2002-11-14 | |||
| DE179538C | ||||
| EP1215426A2 | 2002-06-19 | |||
| DE60000109T2 | 2002-11-07 | |||
| EP1215426A2 | 2002-06-19 | |||
| DE69415683T2 | 1999-09-09 |
Other References:
COUSSEAU P ET AL: "Improved micro-flow regulator for drug delivery systems", PROCEEDINGS OF THE IEEE 14TH. ANNUAL INTERNATIONAL CONFERENCE ON MICROELECTRO MECHANICAL SYSTEMS. MEMS 2001. INTERLAKEN, SWITZERLAND, JAN. 21 - 25, 2001, IEEE INTERNATIONAL MICRO ELECTRO MECHANICAL SYSTEMS CONFERENCE, NEW YORK, NY: IEEE, US, vol. CONF. 14, 21 January 2001 (2001-01-21), pages 527 - 530, XP010534664, ISBN: 0-7803-5998-4
Attorney, Agent or Firm:
Stöckeler, Ferdinand (Zimmermann Stöckeler & Zinkle, Postfach 246 Pullach bei München, DE)
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