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External fixator with controllable damping

  • US 5,207,676 A
  • Filed: 04/23/1991
  • Issued: 05/04/1993
  • Est. Priority Date: 02/27/1989
  • Status: Expired due to Term
First Claim
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1. An external fixator for correcting and reducing fragments of a bone comprising in operable communication:

  • a bar (1, 100,

         200) to be disposed substantially parallel to the bone and having a longitudinal axis therethrough;

    a casing operatively connected to said bar for longitudinal movement with respect thereto;

    at least a first support (3) coupled to said casing and a second support (2) coupled to said bar for orienting pins to be inserted into said bone fragments;

    a displacement member (6,

         201) acting between said bar and said second support for adjusting the distance between said first support and said second support and for preventing rotation between said first support and said second support;

    said casing is adapted to move relative to a sliding block (70,

         270) fixed to said bar so as to obtain a longitudinal reciprocating movement of said casing with respect to said bar and so as to avoid angular displacement of said casing with respect to said bar;

    a damping member (90,

         290) acting between said bar and said casing for damping the longitudinal displacement of said first and second supports;

    an adjustable stop mounted between said bar and said casing to limit the longitudinal movement of said first and second supports towards one another;

    said second support (2) is displaceable longitudinally relative to said first support by means of said displacement member (6,

         201); and

    means for adjusting the damping action of said damping member.

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