Patent ID: 8939995
Filing Date: 2015-01-27
Classification: A61B,A61L

Abstract:
1. A fastening device for fastening a reference device to a part of a body for use in computer-assisted operations, comprising: a component that is at least partly made from an: a first arm having a distal end and a second arm having a second distal end, the first and second arms movable relative to each other, wherein the combination of the first distal end and the second distal end define a clamping region, wherein the first arm and the second arm are mounted such that they can rotate about a pin that is respectively guided through the bearing portion, and a carrier region that includes a wedge-shaped transfer portion and a bearing portion, wherein the transfer portion symmetrically interacts with the first arm and the second arm simultaneously and thus causes a rotation of the arms about their rotational axes, of the same magnitude but in opposite rotational directions, such that the clamp can be attached to the bone with balanced tensions, and an activating portion comprising a turning wheel which, when turned, is translated along a main axis of the bearing portion and which moves the wedge-shaped transfer portion along the main axis of the bearing portion, wherein the bearing portion comprises a main axis and the fastening device is configured such that movement of the wedge-shaped transfer portion along the main axis of the bearing portion causes corresponding movement of at least one of the first arm and the second arm so as to alter a spacing between the first distal end and the second distal end, wherein the clamping region and the transfer portion contact each other, and wherein the clamping region is configured for fastening the clamp to a bone, and wherein during a clamping process, the interaction between the transfer portion and the clamping region is tension-balanced.