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Dermally affixed injection device

  • US 5,931,814 A
  • Filed: 05/12/1997
  • Issued: 08/03/1999
  • Est. Priority Date: 10/28/1994
  • Status: Expired due to Term
First Claim
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1. An injection device for introducing an injection fluid into a patient through the patient'"'"'s skin, which comprises:

  • (a) a casing having an adhesive contact surface for contacting the patient'"'"'s skin and adhering the casing to the patient'"'"'s skin;

    (b) a cannula fixedly positioned relative to the casing, the cannula having a tip configured and dimensioned for piercing the patient'"'"'s skin and introducing the injection fluid into a patient, the tip projecting beyond the contact surface of the casing toward the patient'"'"'s skin;

    (c) a protective element movable from a first position to a second position, the first position being such that the protective element extends beyond the tip of the cannula thereby shielding the tip of the cannula from the patient'"'"'s skin and the second position being such that the protective element is retracted into the casing thereby exposing the tip of the cannula to the patient'"'"'s skin; and

    (d) a drive means for moving the protective element from the first position to the second position.

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