Abstract: A spindle device for a piston, held in a reservoir containing a medicament fluid. The spindle device includes: a first displacement stage with a thread, a second displacement stage with a thread, a drive stage between the displacement stages and having two threads, with one thread engaging the thread of the first displacement stage forming a first spindle drive, and the second thread engaging the thread of the second displacement stage forming a second spindle drive. The first displacement stage and the drive stage move simultaneously in the direction of advance. The first and second displacement stages are connected in a rotationally fixed manner by an element axially surrounding the drive stage for the rotational securing, and the drive stage can be coupled in a rotationally fixed manner to an entrainment rod of a drive device, with the entrainment rod insertable into an axial hole on the drive stage.

Abstract: An ambulatory infusion device for infusion of a liquid drug into a patient's body over an extended period of time and methods thereof are disclosed. The device includes a sensor assembly, which produces a sensor assembly output based on an infusion characteristic of the ambulatory infusion device and based on a supply voltage/current, and a supply unit which is coupled to a sensor of the sensor assembly and generates the supply voltage/current. A sensor testing unit detects a failure of the sensor assembly, wherein the sensor testing unit is coupled to the sensor assembly and the supply unit, and the sensor testing unit carries out a sensor testing sequence. The sensor testing sequence includes controlling the supply unit so as to produce a variation of the supply voltage/current, and determining whether the variation of the supply voltage/current produces a corresponding variation of the sensor assembly output.

Abstract: An ambulatory infusion device for infusion of a liquid drug into a patient's body over an extended period of time and methods thereof are disclosed. The device includes a sensor assembly, which produces a sensor assembly output based on an infusion characteristic of the ambulatory infusion device and based on a supply voltage/current, and a supply unit which is coupled to a sensor of the sensor assembly and generates the supply voltage/current. A sensor testing unit detects a failure of the sensor assembly, wherein the sensor testing unit is coupled to the sensor assembly and the supply unit, and the sensor testing unit carries out a sensor testing sequence. The sensor testing sequence includes controlling the supply unit so as to produce a variation of the supply voltage/current, and determining whether the variation of the supply voltage/current produces a corresponding variation of the sensor assembly output.