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Pen-type injector

  • US 7,905,867 B2
  • Filed: 03/02/2004
  • Issued: 03/15/2011
  • Est. Priority Date: 03/03/2003
  • Status: Active Grant
First Claim
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1. A pen-type injector, comprising:

  • a housing;

    a piston rod having a screw thread and rotatable in only one direction relative to the housing;

    an insert located in the housing threadedly engaged with the piston rod;

    a ratchet associated with the insert configured to allow the piston rod to rotate only in a single direction through the insert;

    a dose dial sleeve rotatable with respect to the housing and the insert;

    a drive sleeve which is axially displaceable but not rotatable with respect to the piston rod;

    a button located on the drive sleeve and rotatable with respect to the drive sleeve; and

    clutch means which upon depression of the button prevents rotation between the dose dial sleeve and the drive sleeve.

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