Isometry testing device

Details Isometry testing device Isometry testing device

1991-04-25

1991-12-10

Hafer, Robert A.

Surgery

Instruments

Orthopedic instrumentation

606102, 606104, A61B 1756

Patent

active

050714201

ABSTRACT:
A device for determining the isometric point of a knee cruciate ligament replacement in a femur after a tibial tunnel has been prepared by attaching a screw to an estimated placement point on the femur with a strand attached to the screw and extending away therefrom. The device comprises a holder, a driver disposed in the holder to engage and drive the screw into the femur, a fitting for positioning the holder to the mouth of the tunnel on the outer anterior tibial surface, a gauge calibrated to provide a selected tension on the strand, and means for attaching the gauge to the holder. The gauge comprises an excursion scale to indicate the movement of the strand when the knee is flexed, a spring for applying a selected tension to the strand, and a gripper for the strand. The holder and the gauge are configured to hold the strand as it extends away from the screw through the tibial tunnel to the gauge, whereby, when the strand is gripped to the spring to have the selected tension thereon and the knee is flexed, the excursion of the point at which the screw is attached will be represented on the excursion scale.

REFERENCES:
patent: 4312337 (1982-01-01), Donohue
patent: 4535768 (1985-08-01), Hourahane et al.
patent: 4632100 (1986-12-01), Somers et al.
patent: 4708139 (1987-11-01), Dunbar, IV
patent: 4772286 (1988-09-01), Goble et al.
patent: 4834080 (1989-04-01), Brown
patent: 4870957 (1989-10-01), Goble et al.
patent: 4911153 (1990-03-01), Border
patent: 4950271 (1990-08-01), Lewis et al.
patent: 4969895 (1990-11-01), McLeod et al.
"OSI Isometric ACL Reconstruction System", Orthopedic Systems, Inc., California.
L. Paulos, M.D., "Concept Precise ACL Guide System", Surgical Technique, pp. 71, 95, Salt Lake City, Utah.
Acufex Cruciate Reconstruction Accessories Brochure, Acufex Microsurgical, Inc., 1986.
J. L. Lewis et al., "Factors Affecting Graft Force in Surgical Reconstruction of the Anterior Cruciate Ligament", Journal of Orthopaedic Research, vol. 8, No. 4, pp. 514-521, 1990.
D. I. Bylski-Austrow et al., "Anterior Cruciate Ligament Replacements: A Mechanical Study of Femoral Attachment Location, Flexion Angle at Tensioning, and Initial Tension", Journal of Orthopaedic Research, vol. 8, No. 4, pp. 522-531, 1990.
B. Graf, M.D., "Isometric Placement of Substitutes for the Anterior Cruciate Ligament", reprinted from The Anterior Cruciate Deficient Knee, D. W. Jackson, M.D., Editor, Mosby (Publication Pending).
"Measure Cruciate Ligament Isometry", MEDmetric Corporation, San Diego, Calif., 1988.
"Surgical Techniques", Arthrex Arthroscopy Instruments, Inc., pp. 1-38, 1991.
Purnell et al., "Arthroscopic Anterior Cruciate Ligament Reconstruction", Johnson & Johnson Orthopaedics, pp. 1-24, 1988.
T. Rosenberg, M.D., "Arthroscopic Technique for Anterior Cruciate Reconstruction", Acufex Microsurgical, Inc., 1988.

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