DETECTING A FULL RESERVOIR OF AN IMPLANTABLE INFUSION DEVICE

摘要

An implantable infusion device (110) includes a housing (130) and a collapsible member (50) and an interference member (64) disposed within the housing. The collapsible member defines a reservoir for containing fluid and has an outer surface (56) that moves between an empty position and a full position in response to a change in volume of fluid contained in the reservoir. The interference member is configured to engage the outer surface of the collapsible member as the reservoir approaches the full position and to cause pressure in the reservoir to increase following engagement with the surface of the collapsible member and concomitant fluid introduction into the reservoir. The infusion device further includes a pressure sensor (14) in communication with the reservoir, which can be used to determine whether the reservoir is full by measuring characteristic pressures associated with the interference member engaging the outer surface of the collapsible member and concomitant fluid introduction into the reservoir.