Abstract: A medical fastening device for noninvasively fastening a medical marking device comprising two or more marking elements to a body part of a patient is provided. The fastening device has a support body which extends over a surface in two directions of extent aligned at an angle to each other and is adaptable in its shape to the contour of the body part, to which the marking device is fixed or fixable. The support body is elastically stretchable in the surface of its extent and comprises a first stretch area and at least one second stretch area, the stretchability of which in at least one direction in the surface of the extent of the support body is less than that of the first stretch area. A medical referencing device and a medical instrumentation comprising such a fastening device are also provided.

Abstract: A medical fastening device for noninvasively fastening a medical marking device comprising two or more marking elements to a body part of a patient is provided. The fastening device has a support body which extends over a surface in two directions of extent aligned at an angle to each other and is adaptable in its shape to the contour of the body part, to which the marking device is fixed or fixable. The support body is elastically stretchable in the surface of its extent and comprises a first stretch area and at least one second stretch area, the stretchability of which in at least one direction in the surface of the extent of the support body is less than that of the first stretch area. A medical referencing device and a medical instrumentation comprising such a fastening device are also provided.

Abstract: A medical referencing device for a medical navigation system is provided, with which a movement of a body part, with the referencing device attached thereto, is trackable in space. The referencing device has a fastening device for fastening the referencing device to the body part and a referencing body which extends over a surface and is elastically stretchable in at least one direction. The referencing body is adaptable in shape to a contour of the body part and has a marking area with a pattern. The referencing body being configured such that during movement of the body part at least a section of the pattern is undeformed or substantially undeformed, and at least a section of the pattern is usable by the navigation system as reference for tracking the body part. A medical navigation system and a method for tracking a medical referencing device in space are also provided.