C - arc - system for the free hand locking of an intramedullary nail

摘要

C - arc - a system (1) for the computer-assisted free hand locking of an intramedullary nail (15), comprising at least one cylindrical hole (15.1) with a hole axis (15.2), into which a locking element along the axis of the hole (15.2) is to be used, with:1.1. a c - sheet (1) by means of a radiator (3) and a detector (2) for receiving a first projection on the receiving means (pa₁),1.2. of a drilling device (14) with an axis of rotation for the administration of a locking nail than the locking element, wherein the drilling device (14) with a 3 - two-axis neutral position with a display device and an at least two-dimensional positioning aid is provided which acts in a translatory manner,1.3. a position of alignment in front of the direction, on which the spatial position of the drilling device (14) is adjustable unambiguously,1.4. at least one computer system (10), each with a memory (10.1) for program code which, in order to control the c - arc - system (1), for the evaluation of image data and to assist positioning on doses serve,1.5. wherein the memory (10.1) of the at least one rake system (10) program code (prg₁–prg_n) is stored, and which carries out in the operation of the following process steps:1.5.1. it is on the basis of the first projection on the receiving means (pa₁) of the c - arc - system (1) and a detected contour of at least one edge of the spatial position and position of the hole axis (15.2) of the at least one cylindrical hole (15.1) in the intramedullary nail (15) is determined,it is recognized as 1.5.2. touchdown point (a) for the boring device (14) of the point of intersection of tissue surface and hole axis (15.2) of the at least one cylindrical hole (15.1) in the intramedullary nail (15) is determined,1.5.3. it is the translation and rotation of the drilling device (14) is calculated, which for the transfer of the axis of rotation of the drilling device (14) into the hole axis (15.2) of the at least one cylindrical hole (15.1) is necessary, and1.5.4. it is the manual alignment of the drilling device (14) by means of optical displays of the drilling device (14) supported by automatic.