Reservoir plunger position monitoring and medical device incorporating same

摘要

Apparatus are provided for infusion devices and related control systems and methods. An infusion device includes a voided portion adapted to receive a shaft portion that includes a shaft coupled to a plunger of a reservoir and a sensing arrangement proximate the voided portion to sense a detectable feature. A control module may determine a remaining amount of fluid in the reservoir or identify an anomalous condition based at least in part on the sensed position of the detectable feature.

主权项

1. An infusion device, comprising:
a housing including a voided region to receive a reservoir, the voided region including a voided portion to receive a shaft portion including a shaft coupled to a plunger of the reservoir, the shaft portion comprising a detectable feature; a sensing arrangement proximate the voided portion to sense the detectable feature when the reservoir is inserted in the voided region; a motor having a rotor coupled to the shaft, the shaft being displaced to deliver fluid from the reservoir in response to rotation of the rotor; a motor position sensor to measure an amount of rotation of the rotor; and a control module coupled to the sensing arrangement and the motor position sensor to obtain a measured position of the shaft using the sensing arrangement, determine an expected position of the shaft based on the amount of rotation, and identify an anomalous condition based on a difference between the expected position and the measured position.