Ratchet lock for an intramedullary nail locking bolt

Details Ratchet lock for an intramedullary nail locking bolt Ratchet lock for an intramedullary nail locking bolt

1991-12-23

1995-12-26

Brown, Michael A.

Surgery

Instruments

Orthopedic instrumentation

606 96, 606 97, A61B 1756, A61B 1758

Patent

active

054783410

ABSTRACT:
This invention includes a ratchet wheel carried by the locking bolt and engaged by a pin carried by the targeting guide. The pin and ratchet wheel permit the locking bolt to rotate in a tightening direction and prevent the bolt from rotating in a direction to cause the bolt to loosen. Therefore, during impact, the bolt is prevented from loosening. After the IM rod is inserted and the surgeon wants to remove the targeting guide, the pin is shifted and locked into a disengaged position with the ratchet wheel to permit the locking bolt to rotate without obstruction. The ratchet pin may be locked in its retracted position.

REFERENCES:
patent: 4135505 (1979-01-01), Day
patent: 4488542 (1984-12-01), Helland
patent: 4615338 (1986-10-01), Ilizarov
patent: 4628922 (1986-12-01), Dewar
patent: 4786063 (1988-11-01), Engelhardt
patent: 4911179 (1990-03-01), Brown
patent: 4913137 (1990-04-01), Azer
patent: 4946459 (1990-08-01), Bradshaw
patent: 4957495 (1990-09-01), Kluger
patent: 4976713 (1990-12-01), Landanger
patent: 4987892 (1991-01-01), Krag

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