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US 5,319,979 AGranted
Load cell pressure sensor for pump cassette
AssigneeAbbott Laboratories
InventorKent D. Abrahamson
Life of this patent
Estimating the term…
Abstract
The present invention relates to a compression load cell used to monitor pressure in a diapragm cassette pumping system. A plunger is axially slidable in a linear bearing and has a first end in contact with the cassette and the second end in contact with the load cell. The force signals have a direct relationship with the pressure in the cassette.
Claims4
A pressure detection mechanism for use with a processor controlled pumping apparatus having a removable pumping cassette, the detection mechanism comprising:
- a mechanism housing mounted in the pumping apparatus;
- means for sensing force mounted in the housing;
- a plunger axially slidable in the housing having a first and second end, the first plunger end adapted for perpendicular abutting contact with the pumping cassette, the second plunger end adapted for abutting contact with the force sensing means;
- bearing means mounted in the housing for providing axial sliding for the plunger to axially contact the sensing means;
- biasing means mounted on the housing for biasing the sensing means axially into contact with the housing;
- and
- means for transmitting force signals from the sensing means to the processor of the pumping apparatus.
4 more elements
Dependencies are inferred from the claim text.