Occlusion detection for a fluid infusion device

摘要

A device for delivering fluid to a user includes a housing, a drive motor assembly in the housing, a force sensor, and an electronics module. The drive motor assembly regulates delivery of fluid by actuating a piston of a fluid reservoir, and the force sensor generates output levels in response to force imparted thereto during, for example, fluid delivery operations. The electronics module processes the output levels of the force sensor to assess the operating health of the force sensor, to check for occlusions in the fluid delivery path, and to monitor the seating status of the fluid reservoir.

主权项

1. A method of detecting occlusions in a fluid path of a fluid infusion device having a drive motor assembly that actuates a piston of a fluid reservoir to deliver fluid from the fluid reservoir, the method comprising:
initiating a fluid delivery action to deliver an amount of fluid from the fluid reservoir; determining, for each of a plurality of measurement points associated with the fluid delivery action, a respective measurement of a quantity that is indicative of pressure in the fluid path, along with a respective delivered volume measurement relative to a reference volume measurement; calculating a first slope based upon a current measurement of the quantity, a previous measurement of the quantity, a current delivered volume measurement corresponding to the current measurement of the quantity, and a previous delivered volume measurement corresponding to the previous measurement of the quantity; calculating a second slope based upon the current measurement of the quantity, an intervening measurement of the quantity that is determined after determining the previous measurement of the quantity, the current delivered volume measurement, and an intervening delivered volume measurement corresponding to the intervening measurement of the quantity; and indicating whether an occlusion has occurred by using the first slope and the second slope.