Volumetric pump with replaceable reservoir assembly

Details Volumetric pump with replaceable reservoir assembly Volumetric pump with replaceable reservoir assembly

1986-09-25

1988-06-07

Pellegrino, Stephen C.

Dispensing

With discharge assistant

Motor operated

222 90, 604155, 604224, 128DIG12, A45D 4004, A61M 3500

Patent

active

047491094

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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patent: 4465475 (1984-08-01), Mardorf
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