TRANSOSSEOUS APPARATUS, TELESCOPIC STAND FOR TRANSOSSEOUS APPARATUS, COMPUTER SYSTEM AND METHOD FOR MODELING BONE FRAGMENT DISPLACEMENT USING TRANSOSSEOUS APPARATUS Russian patent published in 2021 - IPC A61B17/66 A61B17/60 G09B23/28 

FIELD: medicine.

SUBSTANCE: invention relates to medicine. Telescopic stand for the transosseous apparatus includes a threaded rod, an inner sleeve, an axial element on which X-ray-positive markers are fixed, a repositioning unit, which is rotatably placed on the inner sleeve and consisting of a locking bracket, an outer sleeve that can be rotated to change the length of the telescopic rack, two half-sleeves placed inside the outer sleeve to provide threaded interaction with the threaded rod and allow limited axial movement of the outer sleeve with respect to the said half-sleeves, a threaded rod connected by means of half-sleeves to the inner and an outer sleeve so that it passes inside said sleeves. Threaded rod is marked with a scale corresponding to the telescopic arm length marking. On the end surfaces of the half-bushings, at least two projections of different sizes are made. When the outer sleeve is rotated, it is possible to rotate the said half-sleeves relative to the inner sleeve, ensuring their rotation and movement relative to the threaded rod, which leads to alternate alignment of the end surfaces of the different-sized protrusions with one of the grooves of the threaded rod scale. When the locking bracket is removed from the repositioning unit, the outer sleeve gains the possibility of limited axial movement relative to the threaded half-sleeves. The axial element is located in the inner cavity formed by the axial hole of the threaded rod and the axial hole of the inner sleeve. The threaded rod and the inner sleeve are made of X-ray transparent material. The transosseous apparatus contains a main support, a movable support and the above-mentioned telescopic racks connecting said supports to each other. Method for modeling the movement of a bone fragment is performed on a processing device, while the specified method includes the following steps: obtaining at least two scalable digital radiographs of at least two bone fragments previously fixed in the initial position by means of the above transosseous apparatus. At least two scalable digital radiographs are made in at least two projections. Further, obtaining the parameters of the position of the elements of the transosseous apparatus relative to the indicated at least two bone fragments, plotting the axes of the indicated at least two bone fragments on the obtained at least two radiographs, marking the telescopic struts of the transosseous apparatus by indicating X-ray-positive markers on the obtained at least two radiographs with the provision of building a three-dimensional model of the said transosseous apparatus; setting a first target position of at least one of said at least two bone fragments relative to the other bone fragment; modeling sequential changes of the said obtained parameters of the position of the elements of the transosseous apparatus for moving the specified at least one bone fragment from the initial position to a given first target position; setting at least one additional target position of at least one of said at least two bone fragments; and modeling a sequential change in the parameters of the elements of the transosseous apparatus to move the specified at least one bone fragment from the initial position or the first target position to a given at least one additional target position or from the initial position to an additional target position and from an additional target position to the first target position. The computer system for modeling the movement of the bone fragment contains a processing device configured to perform the operations of the above method for modeling the movement of the bone fragment.

EFFECT: provides lightening and simplification of the structure of the apparatus and racks; simplified visualization of bone fragments on radiographs and more accurate deformity correction; prevention of errors for the patient when using the scale during deformity correction; reduction of time when preparing the rack for the rapid deformation correction mode and with the subsequent fixation of the rack.

16 cl, 14 dwg