Medical guiding device

A medical guide device for working on a bone, comprising:

• a holding arrangement, which is holdable firmly against a bone, for holding the guide device firmly against the bone, and
• a saw template with a guide slot for a saw blade,
• the holding arrangement and the saw template engaging with one another and being arranged to be movable in relation to one another in an adjustment position,
• the holding arrangement and the saw template being movable from the adjustment position into a sawing position in which they are held firmly and immovably in relation to one another,
• the guide device comprising a coupling arrangement for coupling the holding arrangement and the saw template in the adjustment position and in the sawing position,
• the coupling arrangement comprising first and second coupling elements which are arranged or constructed on the holding arrangement and on the saw template respectively, which are in engagement with one another in the adjustment position, and which are held against one another with at least one of force locking and positive locking in the sawing position,
• wherein:
• the first coupling element is constructed in a form of a joint ball, and
• the second coupling element is constructed in a form of a joint ball receptacle, the joint ball receptacle forming a hollow cylindrical or substantially hollow cylindrical internal contour.