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Fixation device and method for installing same

  • US 5,843,127 A
  • Filed: 04/21/1995
  • Issued: 12/01/1998
  • Est. Priority Date: 08/22/1994
  • Status: Expired due to Term
First Claim
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1. Apparatus including a fixation device and a device for inserting the fixation device securely into a bore in an element, the apparatus comprising:

  • a hand held device having an actuating mechanism;

    a longitudinally extending member coupled to the hand held device adapted to hold the fixation device at a distal end;

    a fixation device having a plurality of longitudinally extending engaging members adapted to be moved outwardly when the fixation device is inserted into the bore to secure the fixation device in the bore;

    the extending member having an operating member adapted to be coupled to the fixation device for exerting a force on the fixation device tending to cause the engaging members to extend outwardly to engage the wall of the bore;

    the operating member being releasably coupled to the fixation device;

    the extending member comprising a cylinder and the operating member comprising a shaft disposed concentrically in the cylinder, the operating member being coupled to the fixation device for exerting an axial force on the fixation device without rotation of the operating member to cause the engaging members of the fixation device to extend outwardly;

    the fixation device further comprising two parts, each having engaging members extending in one of two opposite directions, one of said parts being in engagement with an abutment surface of the cylinder to prevent movement of the part, the engaging members of the two parts being interdigitated but not necessarily on a one-to-one ratio of interdigitated engaging members and the other part being acted on by said operating member, each part having cam surfaces thereon for causing opposed engaging members of the other part to extend outwardly in response to the force applied by the operating member.

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