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Medical substituting element for hard tissues and artificial joint

  • US 5,879,389 A
  • Filed: 04/01/1996
  • Issued: 03/09/1999
  • Est. Priority Date: 04/07/1995
  • Status: Expired due to Term
First Claim
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1. A medical substituting element for hard tissues comprising;

  • one or a plurality of through hole units into which fixation screws are inserted;

    a screw stopper for stopping said fixation screw inserted into said through hole unit at a position where a head of said fixation screw becomes lower than an upper end of said through hole unit;

    a female thread portion formed in an inner wall of said through hole unit at a position higher than said screw stopper; and

    a screw adapted for threaded engagement with said female thread;

    wherein after said fixation screw inserted into said through hole unit is threaded into hard tissues, said screw is threaded into said female thread portion to ensure a slip-off prevention of said fixation screw;

    and further wherein said has a threading direction opposite to that of said fixation screw.

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