Overfill protection systems for implantable drug delivery device

Details Overfill protection systems for implantable drug delivery device Overfill protection systems for implantable drug delivery device

1999-04-30

2000-11-28

Coggins, Wynn Wood

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604132, 604247, A61M 1100

Patent

active

061528986

ABSTRACT:
A pressure-sensitive overfill protection system for a refillable drug delivery device includes a collapsible link which, in a preferred embodiment, comprises an aneroid having an internal volume of gas at a reference pressure. The collapsible link, in its expanded state, supports on inlet valve in an open position to permit the ingress of new drug fluid into a bellows reservoir. The external surface of the aneroid is exposed to the bellows pressure. When the bellows pressure exceeds the reference pressure, the aneroid collapses and permits the inlet valve to move to a closed position under a biasing force provided by a spring. Further flow of new drug fluid into the drug delivery device is thereby prevented. Moreover, the closure of the valve provides a large increase in pressure is experienced in the refill device and may therefore be sensed by a clinician. Because the overfill protection system is pressure sensitive, it may be used with different sized bellows without modification.

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