Multi stage type flow rate switching device

Details Multi stage type flow rate switching device Multi stage type flow rate switching device

1997-07-14

1999-07-27

Hepperle, Stephen M.

Fluid handling

Systems

Dividing into parallel flow paths with recombining

137599, A61M 114

Patent

active

059273267

ABSTRACT:
A multi-stage type flow rate switching device is provided which simplifies switching of flow paths and which rarely causes erroneous operation. The multi-stage type flow rate switching device includes a constant flow rate path 2 and a variable flow rate path 3 arranged in parallel between a liquid medicine flow inlet port 1 and a liquid medicine flow outlet port 4 where the variable flow rate path 3 can change the flow rate by means of a three-way stopcock 33. Although the flow rate can be switched in four stages when one variable flow rate path 3 is arranged as shown by FIG. 1, the flow rate can be switched in further multi-stages by providing two or more of the variable flow rate paths 3.

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patent: 4643224 (1987-02-01), Rung et al.
patent: 5356379 (1994-10-01), Vaillancourt

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