Patent RU-2764832-C1 (RU)
Inventor: IVANOV EVGENIJ ALEKSANDROVICH
IPC: A61F5/00
Filed: 2021-08-16
Granted: 2022-01-21
Abstract: FIELD: medicine. 
     SUBSTANCE: invention relates to medicine, namely to traumatology and orthopedics, and can be used to determine the rotational position of the tibial component in knee arthroplasty. The device for determining the rotational position of the tibial component of the knee endoprosthesis contains a body, a scale, a position indicator, position fixators. The body (1) is made L-shaped, at an angle of 90°, the vertical part of the body (1) at the end contains a cylindrical cavity (2) and a threaded hole (3), on the bend of the body (1) there is a threaded hole (4), the horizontal part of the body (1) is narrowed towards the middle, at the end of the horizontal part there is a recess (5) in which a through hole (6) is located, the end of the horizontal part of the body (1) has an inclination of 71° relative to the horizontal plane, in the middle of the horizontal part of the body (1) there is a recess (7) at the top, a spherical recess (8) is located at the bottom, connected by a hole (9). The handle (10) is made in the form of a teardrop shape, at the end containing a threaded section (11). The protractor (12) is made in the form of a half-cylinder with a protrusion (13) in the center, a marking (14) is applied on the flat surface of the protractor (12), a threaded hole (15) is located on the protrusion (13) of the protractor (12). The guide (16) is L-shaped, at an angle of 90°, two through oval holes (17) are made in the vertical part of the guide (16), a slot (18) is made on the top of the horizontal part of the guide (16), at the end of the horizontal part of the guide (16) there are recesses (19) at the top and bottom, on which a through threaded hole (20) is located, the slot (18) extends from the recess (19) to the bend of the guide (16). The vertical retainer (21) consists of a base (22) with a threaded section (23) at the end of the base (22), a washer (24), a needle (25). The stem (26) is teardrop-shaped, in the lower part of the stem (26) there is a through threaded hole (27), in the upper part there are five recesses (28) in one line. Retainer (29), made in the form of a wing screw. Horizontal lock (30), made in the form of a wing screw. Washer (31) concave. Washer (32), made in the form of an ellipse, with an off-center position of the through hole. Screw (33). Screw (34). The device precisely determines the rotation of the tibial component of the knee joint endoprosthesis along the protractor by shifting the guide to the left or right, depending on the side of the knee joint. There is no need for a comparative study on the contralateral limb to determine rotation. The measurement accuracy is increased due to the stable fixation of the device in the wound relative to specific anatomical landmarks. Establishing the pin as a static rigidly fixed landmark allows you to orient the rotation of the tibial component during various manipulations of the limb during the operation. Wide area of ​​application, since the device can be used for bilateral lesions of the same segments on the limbs. The device does not require additional actions from the medical staff, it is mobile in use and is fixed directly in the operating wound. It is used for small operating accesses, and with a different position of the patient during the operation on the operating table, which leads to low trauma. The device for determining the rotational position of the tibial component of the knee endoprosthesis is made of high-strength, high-quality, modern materials on modern equipment, using modern technologies. 
     EFFECT: advantages of the proposed device are that the device determines the high accuracy of the rotational position of the tibial component due to the accuracy of determining the anatomical landmarks - the attachment point of the posterior cruciate ligament, the Akagi line and the middle of the tibial tuberosity, with the installation directly of the device in the operating wound, relative to these landmarks , with the determination of the zero position on the protractor relative to the Akagi line. 
     1 cl, 39 dwg