Magnetic positioner arrangement for locking screws for orthopedi

Details Magnetic positioner arrangement for locking screws for orthopedi Magnetic positioner arrangement for locking screws for orthopedi

1989-12-20

1991-09-17

Hafer, Robert A.

Surgery

Instruments

Orthopedic instrumentation

606 96, A61B 1756

Patent

active

050491512

ABSTRACT:
A method and apparatus are provided for rapidly and precisely positioning locking screws or pins into corresponding screw holes in a orthopedic aid such as an intramedullary interlocking rod implanted in a long bone of the limb of a patient, so as to lock the rod in place in the bone. A first magnet is positioned at the location of a screw hole in the rod and an aiming device, comprising a second magnet pivotably mounted so as to be able to be brought in alignment with the first magnet, is used to locate the first magnet and hence enable a screw or pin to be guided into place through the bone into the screw hole in the rod to lock the rod in position. In one embodiment, an elongate insertion member which carries the first magnet at the distal end thereof is used to position the first magnet at the level of the hole in the rod while in a second embodiment, a solid rod is used and the magnet is removably disposed within the hole in the rod prior to implantation of the rod.

REFERENCES:
patent: 4621628 (1986-11-01), Bruderman
patent: 4803976 (1989-02-01), Frigg et al.
patent: 4850344 (1989-07-01), Olerud et al.
patent: 4865025 (1989-09-01), Buzzi et al.
patent: 4877019 (1989-10-01), Vives
patent: 4881535 (1989-11-01), Sohngen
patent: 4901711 (1990-02-01), Goble et al.
patent: 4917111 (1990-04-01), Pennig et al.

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