Methods and devices for occlusion detection using actuator sensors

An infusion device comprising:

• an actuation arrangement coupled to a plunger to deliver fluid via a fluid path;
• a driver module coupled to the actuation arrangement to selectively provide input power to the actuation arrangement;
• a sensing arrangement to measure actuation of the actuation arrangement;
• and
• a control module coupled to the driver module and the sensing arrangement to operate the driver module to provide the input power to the actuation arrangement, identify an active amount of actuation of the actuation arrangement concurrent to the input power being provided to the actuation arrangement using the sensing arrangement, operate the driver module to disable the input power to the actuation arrangement, identify a passive amount of actuation of the actuation arrangement after disabling the input power to the actuation arrangement using the sensing arrangement, and detect an anomalous condition with respect to the fluid path based on a relationship between the active amount and the passive amount, wherein the control module detects the anomalous condition based on a ratio of the active amount of actuation to the passive amount of actuation.

A method of detecting an occlusion in a fluid path, the method comprising:

• operating, by a control module associated with an infusion device, a driver module to provide current flow to a motor to produce a first amount of rotation of a rotor of the motor, wherein the rotor is coupled to a plunger configured to deliver fluid via the fluid path;
• after disabling the current flow to the motor, identifying, by the control module, a second amount of rotation of the rotor using a rotor sensing arrangement;
• detecting, by the control module, an occlusion condition based on a relationship between the first amount and the second amount, wherein detecting the occlusion condition comprises detecting the occlusion condition based on a ratio of the first amount to the second amount;
• and
• generating, by the control module, a user notification in response to detecting the occlusion condition.