Patent ID: 9446185
Filing Date: 2016-09-20
CPC Classification: A61M,F04B

Claim Text:
1. An ambulatory infusion pump for delivering a desired volume of a therapeutic fluid to a patient's body, the pump including a dispensing unit comprising: a reservoir to retain therapeutic fluid; a driving mechanism for delivering therapeutic fluid from the reservoir into a patient's body, the driving mechanism including a movable member that moves when therapeutic fluid is being delivered; at least one sensor configured to sense a relative radial position of the movable member from an initial position, and generates position sensor signals representing the relative position of the movable member from the initial position, the sensor sensing in the direction from a circumference inward along a radius of the movable member, the at least one sensor comprising a light-emitting source and a light detector, with equally spaced protrusions on the moveable member therebetween intermittently blocking the light emitted by the light-emitting source, and the at least one sensor detects when the protrusions block the light emitted by the light-emitting source and generates the position sensor signals as on-off signals transmitted to a processor; and the processor in electrical communication with the at least one sensor and configured with instructions to control the driving mechanism,