Patents Assigned to H. Weidmann AG Weidmann
  • Automatic cannula withdrawing device for injection syringes
    Patent number: 6015396
    Abstract: An automatic needle retraction device includes a housing and retraction device for completely retracting a needle back into the housing after use. A selector switch device includes an equalization part, which produces a negative pressure to accept the fluid compressed during the retraction of the hollow needle. Thus, during retraction of the needle, compressed injection solution is not sprayed outward from the needle.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: January 18, 2000
    Assignees: H. Weidmann AG Weidmann, Daniel Vuille
    Inventors: Heinz Buttgen, Konrad Burger, Tilo Callenbach, Karl Mazenauer, Daniel Riesen, Daniel Vuille