Patent ID: 8197444
Filing Date: 2012-06-12
Classification: A61M

Abstract:
1. A device for delivering fluid to a user, the device comprising: a housing; a reservoir cavity within the housing to accommodate fluid reservoirs; a drive motor assembly in the housing to regulate delivery of fluid by actuating a piston of a fluid reservoir; a force sensor associated with the drive motor assembly to generate output levels in response to force imparted thereto; and an electronics module coupled to the force sensor to process the output levels to determine a seating status of the fluid reservoir in the reservoir cavity, wherein the electronics module: maintains a count that is indicative of the seating status; stores an adaptive reference force value that corresponds to a previously recorded measure of actuation force imparted to the force sensor during a previous fluid delivery pulse; obtains a current measure of actuation force imparted to the force sensor for a current fluid delivery pulse; changes the count when the current measure of actuation force is less than the difference between the adaptive reference force value and a threshold force value, resulting in an updated count; and generates a seating status alert when the updated count satisfies predetermined alert criteria.