Pump mechanism having a drive motor with an external rotor
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United States of America Patent
Stats
-
Aug 30, 1994
Grant Date -
N/A
app pub date -
Nov 17, 1992
filing date -
Nov 17, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump mechanism using a drive motor having an external rotor. In one case, cams are mounted on the external surface of the rotor. Cam followers or peristaltic fingers engage the cams and move linearly in response to the rotational cam motion. The cam surfaces are rotated from adjacent cam surfaces to achieve a peristaltic effect through the peristaltic fingers sequentially pressing against the fluid tubing. In another case, the external surface of the rotor is threaded and elongated. A nut is mounted on the rotor and confined to travel in only a linear direction. A coupling arm is connected between the nut and a syringe plunger to force the plunger into the syringe barrel and thereby move the fluid.
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