Method and device for positioning or attaching a medical operating instrument, especially an incision block or a cutting block
The present invention relates to a device for positioning a jig at a structure using at least one fixing element comprising at least one adjusting element which can directly interact with or guide the at least one fixing element and which can interact with the jig, so that the relative position between the at least one fixing element and the jig can be adjusted by changing the position of the at least one adjusting element, as well as to a method for positioning a jig at a structure comprising two rotatable adjusting elements, wherein the resection plane of the jig can be moved along or in a first direction when the adjusting elements are moved in the same direction and wherein the resection plane is turned if the adjusting elements are moved in an opposite or different direction or only one adjusting element is moved.
1. A method for positioning and/or attaching a device to a patient, the device comprising first and second rotatable adjusting elements supported with respect to the jig for rotation about respective axes, the first and second adjusting elements each including an excentric bushing having a center axis offset from the respective axis of the respective adjusting element, and first and second fixing elements extending through the excentric bushings of the first and second adjusting elements respectively and attached to the body of the patient, the fixing elements being rotatably constrained within the respective excentric bushing, comprising the steps:
(a) providing a pre-calibrated device connected to or bearing a reference array;
(b) inserting a positioning tool into a joint space between a first bone and a second bone of the patient;
(c) rotatably attaching the device to the positioning tool;
(d) rotating the device around a second rotation axis determined by the positioning tool;
(e) fixing the device to the patient thereby defining a first rotation axis by inserting the first fixing element through a first one of the excentric bushings;
(f) rotating the device around the first rotation axis by rotating the device around the first fixing element;
(g) fixing the device to the patient via a fixing point which is not on the first rotation axis by inserting the second fixing element through a second one of the excentric bushings; and
(h) rotating the first and second adjusting elements uniformly to effect translating movement of a resection plane of the jig, and rotating at least one of the first or second adjusting elements non-uniformly with respect to the other to effect rotating movement of the resection plane of the jig.
2. The method according to claim 1 , wherein after step (e) and before step (f) the method comprises the step:
(e 1 ) loosening the connection between the device and the positioning tool.
3. The method according to claim 1 , wherein a fixing step is performed by inserting a pin.
4. The method according to claim 1 , wherein the positioning tool is removed after a connection to the device is loosened.
5. The method according to claim 1 , wherein a slope of the device is adjusted by turning a swivel joint of the positioning tool.
6. The method according to claim 1 , wherein a navigation system determines a rotation angle in step (e) and/or in step (g) and/or a slope of the device.
7. The method according to claim 1 , wherein the reference array is trackable by a medical navigation system.