Volumetric pump with replaceable reservoir assembly
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 10, 1987
Grant Date -
N/A
app pub date -
Nov 15, 1983
filing date -
Nov 15, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An infusion pump has a removable reservoir including a piston and drive member. The drive member is an internally threaded elongated portion of the piston. A motor rotates a short drive screw, which engages the threads of the drive member to displace the piston in the reservoir. In one embodiment the piston is attached to the drive member by a severable central stem which breaks away to allow engagement with the drive screw. With the stem severed, the piston cannot be retracted, or the reservoir refilled. Other safety features are shown for locking the displaced piston in the reservoir. A digital metering system has a safety circuit to prevent dangerous failure modes of the rotation sensor and motor drive systems.
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