OCCLUSION DETECTION TECHNIQUES FOR A FLUID INFUSION DEVICE HAVING A ROTARY PUMP MECHANISM AND ROTOR POSITION SENSORS

摘要

An embodiment of a fluid infusion device includes a fluid pump mechanism having a rotor and a stator. The rotor includes a reference surface and a cam element rising from the reference surface, and the stator includes a cam element having a stator cam surface. The cam elements cooperate to axially displace the rotor as a function of angular position of the rotor. A biasing element provides force to urge the cam elements together. A drive motor actuates the rotor to pump medication fluid from a fluid cartridge module to a body, via a subcutaneous conduit. A detection circuit processes axial and angular position data of the rotor, and determines that an upstream occlusion has occurred based on detectable characteristics of the axial and angular position data.

主权项

1. A fluid pump mechanism comprising:
a stator comprising a stator cam element having a stator cam surface; a rotor comprising a reference surface and a rotor cam element having a variable height rising from the reference surface, the rotor cam element cooperating with the stator cam element to axially displace the rotor, relative to the stator, as a function of angular position of the rotor; a biasing element that provides a biasing force to urge the rotor cam element toward the stator cam element and toward the reference surface; and a detection circuit to process axial and angular position data of the rotor, and to determine that an upstream occlusion has occurred based on detectable characteristics of the axial and angular position data.