Tighening instrument for orthopaedic surgery of the spine
AssigneeSofamor S.N.C.
InventorsRemi Cavagna, Denis Huten, Hugues Malandain
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Abstract
The tightening instrument is made up of two parts (2,4) joined to each other by means which are designed to automatically uncouple the said two parts (2,4) by shearing rupture of a pin (8) when a predetermined tightening torque is reached, a first (2) of the two parts being provided with a means (3) permitting driving, characterized in that the second (4) of the two parts is a rod whose end (5) opposite its tighteing end (6) is adapted to be introduced into a complementary recess (7) formed in the first part (2), and in that the said end (5) includes an axial reservoir (15) for receiving the broken end section (18) of the pin (8).
Claims12
An instrument for tightening bone screws into a patient during orthopedic surgery, comprising:
- a first body and a second body, said first and second bodies being connected by mutually engageable male and female contacts, said first and second bodies sharing a common axis of rotation;
- said first body having a proximal end and a distal end;
- said second body having a reservoir therein, said second body having a proximal end and a distal end, said distal end having a profile to engage a bone screw;
- and
- a shear pin with an end section, said shear pin being inserted through said first and second bodies with said end section positioned inside the reservoir of said second body, whereby the reservoir can receive said end section when said shear pin breaks.
Dependencies are inferred from the claim text.