A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
128/41
A61F 1/00 (1980.01)
Patent
CA 1111603
ABSTRACT OF THE DISCLOSURE The present invention relates to a bone screw driving device for tightening a bone screw into bone material during orthopedic or traumatologic surgery to a torque value M0 which is less, by a predetermined fixed factor, than the torque value at which the bone material irreversibly deforms. A device is disclosed which is adapted for use in orthopedic and tramatologic surgery for tightening a bone screw into bone material to a defined torque value which is less than the torque value at which the bone material irreversibly deforms, which device comprises screw driving means for engaging the bone screw to rotate and apply tightening torque to it, means for measuring the amount of tightening torque applied to the bone screw by the screw driving means, means for measuring the angle of rotation of the bone screw, and control means for relating the tightening torque applied to the bone screw commencing with the contact of the screwhead with the underlying material, such as bone material or an implant, and the angle of rotation of the bone screw commencing with said contact and specifying a torque value M0 which is less, by a predetermined fixed factor, than the torque value at which the bone material irreversibly deforms. The control means specifies M0 on the basis that M0 is proportional to the quotient M/.alpha. where .alpha. is the increase in the angle of rotation of the bone screw commencing with the contact of the screw head with said underlying material and where M is the tightening torque applied to the screw as the screw is rotated through .alpha..
327910
Borden Ladner Gervais Llp
Synthes Ag Chur
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