Surgery – Instruments – Orthopedic instrumentation
Patent
1998-12-22
2000-01-25
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606102, A61B 1762
Patent
active
060173416
ABSTRACT:
The present invention relates to methods for measuring the strength of a healing bone fracture by rotating the bones about their axis at each side of the fracture relative to each other and measure the needed rotational moment as a function of the rotational angle obtained. The present invention also relates to apparatus comprising a first (5) and a second (8) ring shaped member, studs (15) connecting these members (5, 8) with an axial distance from each other, and fixing pins (6, 14) rigidly connecting the respective ring shaped members and the bone (1) at respective sides of the fracture. One ring member (8) comprises a first (10) and a second (9) element joined so that they can be rotated but not axially displaced relative to each other, the first element (10) carrying the studs (15) and the second element (9) carrying the fixing pins (14). The elements (9, 10) forming the second ring member (8) are engaged by respective jaws of a tong shaped tool provided with measuring devices (42, 47) to measure the length of the movement of the jaws and the force needed for this movement.
REFERENCES:
patent: 4576158 (1986-03-01), Boland
Raschke Michael J.
Windhagen Henning J.
Buiz Michael
Novo Nordisk A S
Reip David O.
Zelson Esq. Steve T.
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