Dosing unit for an infusion pump device

摘要

A dosing unit for an ambulatory infusion pump device is presented. The dosing unit comprises a cylinder pump with a cylinder and a piston arranged in the cylinder. The piston has a shaft with a first threaded segment interacting with a threaded portion of the cylinder and can be displaced along a longitudinal axis of the cylinder by rotating the piston in regard to the cylinder around the axis. Furthermore, the piston allows for the relative or absolute determination of the longitudinal and/or rotational displacement of the piston in regard to the cylinder. In one embodiment, the piston shaft comprises a second segment provided with optically detectable markings that allow the monitoring of the longitudinal and/or rotational displacement of the piston in regard to the cylinder.

主权项

1. A dosing unit for an ambulatory infusion pump device, the dosing unit comprises:
a cylinder pump comprising,
a cylinder; anda piston displaceable along a longitudinal axis of the cylinder, wherein the piston has a piston head and a piston shaft, wherein the piston shaft has a shaft segment provided with markings that can be detected, and wherein the markings are a plurality of stripes arranged on the shaft segment in the form of at least two stripes arranged on the shaft segment along the circumference of the shaft and parallel to the longitudinal axis; a valve that can be in two operational states; and a window provided on the cylinder for providing optical access to the plurality of stripes, wherein the window provides optical access to the plurality of stripes when the valve is in one of the two operational states and does not provide optical access to the plurality of stripes when the valve is between the two operational states.