Patent ID: 8845587
Filing Date: 2014-09-30
Classification: A61M,Y10T

Abstract:
1. A delivery device for delivering an infusion medium to a user, the device comprising: first and second housing portions adapted to be carried by a user and configured to be selectively engaged together for operation and selectively separated from each other; a reservoir supported by the first housing portion, the reservoir including a reservoir housing having an interior volume, a plunger head moveable within the reservoir interior to selectively change the volume of the reservoir interior and a plunger rod extending from the plunger head to a position outside of the reservoir housing, wherein the plunger rod comprises a threaded portion for at least a portion of the rod's length; a nut member being supported in a fixed relation with the plunger rod of the reservoir, the nut member having a structure for engaging the threaded portion of the plunger rod in any one of a plurality of positions in a first dimension relative to the nut member, and wherein the nut member includes a detectable feature; a rotatable lead shaft supported by the second housing portion for rotation about a rotary axis; and a sensor arranged to detect the detectable feature to provide a signal corresponding to the position of the detectable feature, wherein the position of the detectable feature corresponds to a fill state of the reservoir.