External drug pump

  • US 9,861,759 B2
  • Filed: 08/12/2013
  • Issued: 01/09/2018
  • Est. Priority Date: 10/02/2007
  • Status: Active Grant
First Claim
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1. An activation mechanism for a drug delivery device wearable by a patient, the activation mechanism comprising:

  • a base having a patient contact surface;

    a hollow sleeve disposed on the base, the hollow sleeve having first and second ends and extending along a longitudinal axis between the first and second ends, the hollow sleeve having a holding portion, the holding portion extending generally longitudinally from the first end of the sleeve, the holding portion having a retaining surface arranged opposite to the first end of the sleeve, the retaining surface facing the patient contact surface of the base and extending generally perpendicularly with respect to the longitudinal axis, the retaining surface being positioned between the first end of the sleeve and the patient contact surface of the base;

    a longitudinally extending needle having a sharp end and an opposed end;

    a needle holder coupled to the opposed end of the needle and being movable along the longitudinal axis with respect to the sleeve between a withdrawn position, wherein the sharp end of the needle is disposed within the base, and an injection position, wherein the sharp end of the needle extends beyond the patient contact surface of the base;

    a spring coupled to the needle holder and biasing the needle holder to the withdrawn position;

    a longitudinally extending cannula having a free end and being sized to coaxially receive the needle therein;

    a cannula holder coupled to the cannula opposite the free end thereof and movable along the longitudinal axis between a retracted position, wherein the free end of the cannula is disposed within the base and at least a portion of the cannula holder is disposed between the first and second ends of the sleeve, and an extended position, wherein the free end of the cannula extends beyond the patient contact surface of the base, andwherein the retaining surface of the holding portion abuts a generally radially extending ledge of the cannula holder when the needle holder is in the withdrawn position and the cannula holder is in the extended position to prevent relative movement of the cannula holder to the retracted position.

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