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Dosing unit for an infusion pump device

  • US 9,446,193 B2
  • Filed: 10/09/2013
  • Issued: 09/20/2016
  • Est. Priority Date: 04/12/2011
  • Status: Active Grant
First Claim
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1. A dosing unit for an ambulatory infusion pump device, the dosing unit comprises:

  • a cylinder pump comprising,a cylinder; and

    a 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.

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