Patent ID: 8303303

Claim:
An arrangement for determining position and fixation of an element in a vertical direction and a transverse direction in relation to a part in or on a bone or a model of a bone, the arrangement comprising: a sleeve comprising an inner surface; an expansion spacer extending through the sleeve and comprising an outer sleeve engaging surface and an inner conical expansion surface, the expansion spacer comprising a first flange at a first end of the expansion spacer extending in a radial direction relative to a longitudinal axis of the expansion spacer and configured to engage a first end of the sleeve, the expansion spacer further comprising a second flange at a second end of the expansion spacer extending in the radial direction relative to the longitudinal axis of the expansion spacer and configured to engage a second end of the sleeve when the expansion spacer is expanded to vertically fix the expansion spacer with respect to the sleeve; an expansion screw extending through the expansion spacer and comprising an outer conical expansion surface configured to cooperate with the inner conical expansion surface on the expansion spacer to radially expand the expansion spacer causing the outer sleeve engaging surface on the expansion spacer to engage the inner surface of the sleeve, thereby determining the position of the sleeve relative to the part and fixing the sleeve, wherein radial expansion of the expansion spacer causes an outer surface of the expansion spacer to be positioned substantially parallel to the inner surface of the sleeve; and an assembly template configured to be arranged on soft tissue over the bone, the assembly template comprising a through hole extending therethrough, wherein the sleeve is arranged in the through hole, wherein when the expansion spacer is not expanded, the first flange has a first maximum diameter and the second flange has a second maximum diameter, the first maximum diameter being larger than the second maximum diameter and larger than a minimum diameter of the sleeve, the second flange being smaller than the minimum diameter of the sleeve, and when the expansion spacer is expanded, the second flange has a diameter being larger than the minimum diameter of the sleeve.