59 results about "Tibial osteotomy" patented technology

The invention belongs to the technical field of instruments for knee arthroplasty, and particularly relates to a rotatable central positioning angle-adjustable tibia osteotomy template, which mainly comprises a fixed frame, an angle adjusting device, an angle adjusting device and an angle adjusting device, the guide frame is arranged in the mounting groove, an osteotomy groove is formed in the guide frame in a penetrating mode, the guide frame is provided with a first rotating track and a second rotating track relative to the fixed frame, and the axis of the first rotating track is perpendicular to the axis of the second rotating track; the first angle adjusting mechanism is connected with the fixed frame and the guide frame, and the first angle adjusting mechanism is constructed to be capable of driving the guide frame to rotate in the mounting groove along a first rotating track; the second angle adjusting mechanism is connected with the fixed frame and the guide frame, and the second angle adjusting mechanism is configured to drive the guide frame to rotate in the mounting groove along a second rotating track; and when the guide frame rotates along the first rotating track, the second angle adjusting mechanism synchronously moves along with the guide frame.

The present invention relates to a distal femoral osteotomy positioning device, comprising a positioning block, a spacer, and an osteotomy guide. The positioning block has a first positioning surface, the first positioning surface being used to contact the tibial osteotomy surface so that the positioning block is positioned on the tibia; the spacer has a second positioning surface opposite to the first positioning surface, the second positioning surface being used to contact the distal articular surface of the femur, and an angle is formed between the first positioning surface and the second positioning surface; the osteotomy guide has an osteotomy groove. The distal femoral osteotomy positioning device of the present invention can maintain a posterior tilt angle of 3° to 7° during tibial osteotomy so that the tibial plateau conforms to the physiological morphology of the knee joint, while reducing the situation in which the distal femoral osteotomy thickness varies due to inconsistent insertion depth of the positioning block into the knee joint, thereby maintaining the accuracy of osteotomy positioning.

The utility model belongs to the field of medical instruments, and provides a tibia osteotomy guide plate which comprises a tibia osteotomy guide part, a tibia first attaching part and a tibia second attaching part, and the tibia osteotomy guide part is provided with a tibia osteotomy groove; the tibia first attaching part is connected with the tibia osteotomy guide part, and the tibia first attaching part is provided with a tibia first attaching face used for being attached to a tibia articular face; the second tibia attaching part is connected with the tibia osteotomy guiding part, the second tibia attaching part is provided with a second tibia attaching face used for being attached to the side face of the near end of the tibia, and the second tibia attaching part is provided with a tibia positioning hole; wherein a tibia side anti-skid structure is formed on the tibia first binding surface and / or the tibia second binding surface. The tibia osteotomy guide plate can be stably and accurately attached to the proximal end of the tibia.

The present invention provides a tibial osteotomy block locking device, comprising: a locking body, the locking body having a mounting hole sleeved on the tibial osteotomy positioning tool along the axial direction, and the tibial osteotomy positioning tool can move along the mounting hole; and a locking member arranged on the locking body, the locking member having a locking hole for the tibial osteotomy positioning tool to pass through along the axial direction, the locking hole comprising a local threaded hole and a local light hole corresponding to the local threaded hole, the locking member can slide relative to the locking body, so that the local threaded hole and the threaded section of the tibial osteotomy positioning tool are screwed together or separated. Through the cooperation of the local threaded hole and the threaded section of the tibial osteotomy positioning tool, the tibial osteotomy block locking device can securely fix the tibial osteotomy block, prevent the tibial osteotomy block from falling due to vibration, and at the same time, the tibial osteotomy block locking device can be quickly assembled, disassembled and fine-tuned, with a simple structure and convenient operation.

The invention pertains to a bone plate (10) designed for tibial Osteotomy, offering enhanced correction capabilities for genu varus deformity of the knee joint. The bone plate comprises an upper portion (12), a middle portion (14), and a lower portion (16), each equipped with a plurality of holes for secure attachment to the tibia at various locations. The middle portion (14) is pivotal in achieving correction at the osteotomy site, utilizing blocks (22) with threaded holes for fixation via locking screws (24) to achieve a valgus overcorrection of 2 to 6 degrees. The bone plate features three locking holes (18) in the upper portion and locking holes (20) with diameters less than 5 mm in the middle portion.

The application relates to the technical field of orthopedic surgery navigation, and discloses a high-position tibial osteotomy navigation method, a system and a storage medium, and a communication method which comprises the following steps: generating a 3D bone model of a lower limb of a patient based on medical images and performing preoperative osteotomy planning; performing visual positioning system detection and spatial calibration of a surgical instrument; installing an optical marker array, collecting actual bone point cloud data, and realizing alignment of the model and the bone through a registration algorithm; in-surgery real-time calculation and display of deviation of an operation track and planning parameters; post-surgery reconstruction of a lower limb force line, and comparison and evaluation with preoperative planning and in-surgery navigation records. The system comprises a hardware execution unit and preoperative planning, calibration verification, in-surgery registration, real-time navigation and post-surgery evaluation modules. The application realizes full-process integration of preoperative accurate planning, in-surgery real-time closed-loop navigation and post-surgery quantitative evaluation, and significantly improves the precision, repeatability and predictability of clinical effects of surgery.

The invention relates to the technical field of tibia osteotomy three-dimensional model construction, in particular to a personalized tibia osteotomy three-dimensional model generation method based on CT scanning data. The method comprises the steps of obtaining tibia CT slices of a patient; obtaining the structural feature indexes of the angular points according to the occurrence and distribution of the angular points in the tibia CT slice in the different scale transformation images; according to the matching condition of the angular points in the tibia CT slices of the current patient and the historical patient, the stable distribution degree of the angular points is obtained; according to the structural characteristic indexes and the stable distribution degree, the type of each angular point in the tibia CT slice of the current patient is obtained, and a tibia osteotomy three-dimensional model of the current patient is constructed. According to the method, the tibia osteotomy three-dimensional model is constructed on the basis of obtaining the type of each angular point in the tibia CT slice of the current patient, each part of the tibia of the current patient can be accurately identified, damage to blood vessels in tissues in the tibia treatment process is avoided, and the tibia treatment effect is effectively improved.

The invention discloses a mounting assembly, a caster angle adjusting assembly, a distance adjusting assembly and a tibia osteotomy positioning device.The tibia osteotomy positioning device is connected with a tibia osteotomy block through the mounting assembly, fixed to a human body through a fixing assembly and then connected with the mounting assembly and the fixing assembly through the distance adjusting assembly; therefore, the distance between the tibia osteotomy block and the fixing assembly is adjusted. The distance adjusting assembly only needs to enable the moving part to be switched between the coupling state and the decoupling state, the two functions of rapid adjustment and micro adjustment of the distance between the tibia osteotomy block and the fixing assembly can be achieved, operation is very convenient, and the structure is simple.

The present invention relates to the technical field of constructing three-dimensional models of tibial osteotomy, and specifically relates to a method for generating a personalized three-dimensional model of tibial osteotomy based on CT scan data. This method obtains the tibial CT slices of a patient; according to the appearance and distribution of corner points in the tibial CT slices in images with different scale transformations, obtains the structural feature indexes of the corner points; according to the matching situation of corner points in the tibial CT slices of the current patient and historical patients, obtains the stable distribution degree of the corner points; according to the structural feature indexes and the stable distribution degree, obtains the type of each corner point in the tibial CT slices of the current patient, and constructs a three-dimensional model of tibial osteotomy for the current patient. The present invention constructs a three-dimensional model of tibial osteotomy on the basis of obtaining the type of each corner point in the tibial CT slices of the current patient, which is beneficial to accurately identify each part of the tibia of the current patient, avoid damaging the blood vessels in the tissue during tibial treatment, and effectively improve the effect of tibial treatment.

The application provides a tibial osteotomy measuring device, which comprises: a valgus angle measuring member and a base plate cooperatively showing a valgus angle; a first end of a first measuring member can be matched with the lowest part of the medial tibia, a second end of the first measuring member is movably arranged in a first sliding seat, and a middle part of the first measuring member is movably arranged in a first guide groove; a lateral osteotomy depth measuring mechanism and a medial osteotomy depth measuring mechanism are arranged at intervals, a first end of a second measuring member can be matched with the lowest part of the lateral tibia, a second end of the second measuring member is movably arranged in the first sliding seat, and a middle part of the second measuring member is movably arranged in the first guide groove; the medial osteotomy depth measuring mechanism and the lateral osteotomy depth measuring mechanism are driven and matched with the valgus angle measuring member. The technical scheme of the application effectively solves the problem that the osteotomy measuring scale in the related art cannot simultaneously indicate the valgus angle and the medial and lateral osteotomy depth.

The application discloses a tibial osteotomy positioning assembly, a gap measuring assembly, an osteotomy device and an osteotomy system. The tibial osteotomy positioning assembly comprises a mounting mechanism and at least one measuring piece. The mounting mechanism is used for connecting with a tibial osteotomy block. The at least one measuring piece is used for connecting with the mounting mechanism. The mounting mechanism can place the at least one measuring piece in a first measuring position and a second measuring position. The at least one measuring piece is located at different positions of the mounting mechanism when being placed in the first measuring position and the second measuring position. The measuring piece in the first measuring position is used for being inserted between an inner condyle of a femur and an articular surface of a tibia, so as to measure the distance between the inner condyle and the articular surface, and to position the relative positions of the tibial osteotomy block and the articular surface. The measuring piece in the second measuring position is used for being inserted between an outer condyle of the femur and the articular surface of the tibia, so as to measure the distance between the outer condyle and the articular surface, and to position the relative positions of the tibial osteotomy block and the articular surface.

Provided is a tibial augment block, including an insert. The insert is arc-shaped, a convex side of the insert is provided with a connecting plate for being connected to an outer wall of tibia, a connecting hole facing the tibia is formed in the connecting plate, a certain included angle is formed between an axis of the connecting hole and each of upper and lower end surfaces of a tibial osteotomy area, and a connector for connecting the tibia is arranged in the connecting hole. The connecting hole is provided to make the connector form a certain angle with each of the upper and lower end surfaces of the osteotomy area.

The invention relates to the technical field of medical instruments, in particular to a tibia osteotomy angle measuring device which comprises a positioning plate, a first connecting rod is arranged at the lower end of the positioning plate, a first rotating shaft is fixedly connected to the upper end of the first connecting rod, and the first connecting rod is rotationally connected with the positioning plate through the first rotating shaft; a locking assembly is arranged on the left side of the first rotating shaft, and a fixing assembly is arranged at the lower end of the first connecting rod. According to the invention, the locking assembly is arranged; after the device is fixed and an angle is measured, when a first connecting rod drives a first rotating shaft to rotate inwards, the tooth orientation of a ratchet wheel is consistent with that of a movable plate, so that the first rotating shaft pushes the movable plate to swing when driving the ratchet wheel to rotate; the teeth at the movable plate are inserted into the gaps of the ratchet wheel to lock the first connecting rod, so that the first connecting rod cannot rotate in the opposite direction, and the phenomenon that the accuracy is reduced due to the displacement phenomenon which is not recorded completely is avoided.

The utility model provides an adjustable unicompartmental tibia osteotomy guiding device. The adjustable unicompartmental tibia osteotomy guiding device comprises a guiding assembly, an adjusting assembly and a calibration rod. The adjusting assembly is provided with a bearing part, a rotary adjusting part and a vertical adjusting part; the guide assembly is fixedly connected with the first end of the vertical adjusting part, and when the second end of the vertical adjusting part is located at the first position of the rotary adjusting part, the guide assembly is provided with an initial osteotomy surface; when the rotating adjusting part is rotated, the second end of the vertical adjusting part can move in the second direction, so that the guiding assembly is provided with a calibrated osteotomy surface, and a first preset angle is formed between the calibrated osteotomy surface and the initial osteotomy surface. The second end of the vertical adjusting part can be driven to move in the second direction by rotating the rotating adjusting part, and when the second end of the vertical adjusting part moves in the second direction, the guide assembly can have a calibrated osteotomy surface forming a first preset angle with the initial osteotomy surface. Inversion type osteotomy can be finally realized according to osteotomy of the calibrated osteotomy surface, so that excessive osteotomy can be prevented, and the osteotomy effect is improved to a certain extent.

The present invention relates to a tibial osteotomy guide protection device based on 3DP technology and an assembly method thereof, belonging to the field of medical device technology, including a personalized customized tibial fixation sleeve, a bone debris recovery baffle plate slidingly arranged on the outer side of the tibial fixation sleeve, a tibial osteotomy guide surface on the front end surface of the tibial fixation sleeve, a bone trough osteotomy guide groove on the top of the tibial fixation sleeve, and a bone trough osteotomy depth guide arranged on the front end surface of the bone trough osteotomy guide groove. The present invention simultaneously arranges a baffle structure of a protective enclosure, a recovery structure curled to form a waste bone debris recovery groove, and a guide structure accurately guiding the osteotomy path on the osteotomy guide protection device, thereby facilitating the protection of adjacent tissues from being damaged during osteotomy, facilitating clear osteotomy operation guidance and easy operation, facilitating the rapid and effective collection and cleaning of bone debris during osteotomy, and facilitating the accurate osteotomy size to ensure subsequent bone grafting and fixation, thereby greatly improving the convenience and success rate of surgery.

This invention discloses an extramedullary tibial osteotomy device for knee replacement surgery, belonging to the field of medical device technology. The device includes a main connecting rod, with an ankle fixation module below it. The ankle fixation module includes an ankle connecting seat, and an angle adjustment module for adjusting varus / valgus and anteversion / anteroversion angles is located behind the ankle connecting seat. The lower end of the main connecting rod is fixed to the angle adjustment module. Above the main connecting rod are a tibial measurement module and a tibial osteotomy module. An upper navigation module and a lower navigation module are respectively located at the upper and lower ends of the main connecting rod. Both the upper and lower navigation modules contain remote sensing modules for acquiring the tibial varus / valgus and anteversion / anteroversion angles. This invention's extramedullary tibial osteotomy device for knee replacement surgery is simple to operate, has a short operation time, and is inexpensive.

The invention discloses a positioning method, system and tool used in movable plateau unicompartmental knee arthroplasty, and the method comprises the following steps: when a patient is in a lithotomy position, vertically and upwards extending the inward 1 / 3 position of a tibial tuberosity of the patient to the upper edge of patella and then extending to the body surface connecting line of anterior superior spine of iliac, and determining the ilioshin line of the patient; determining the inner side edge of the vertex of the tibial spine on the inner side of the patient as an osteotomy starting point; determining that the saw blade direction of osteotomy is parallel to the ilioshin line; the installation position of the thighbone drilling guider is located at the position with the distance of 5.25-7.25 mm from the vertical osteotomy face of the tibia through a quantification method; the rotating position of the femoral prosthesis is limited through geometric constraint, so that the connecting line of the center points of the two preset fixing nails on the femoral prosthesis is perpendicular to the tibia osteotomy surface. Good tibia prosthesis rotation is obtained by accurately guiding tibia vertical osteotomy through the body surface iliotibia line, good liner inner and outer side positions are obtained by quantifying the distance between the thighbone drilling guider and the tibia vertical osteotomy surface, and a good liner movement track can be provided.

The utility model discloses an ankle joint tibia support osteotomy guide plate which comprises a base body and an osteotomy groove arranged on the base body in a penetrating mode, a first base portion and a second base portion are formed on the upper side and the lower side of the osteotomy groove of the base body respectively, and a groove hole communicated with the osteotomy groove is formed in the second base portion. The direction perpendicular to the osteotomy guide plate is defined as the insertion direction of the osteotomy tool, and the osteotomy groove and the groove hole are obliquely formed in the insertion direction of the osteotomy tool. Compared with the prior art, the oblique osteotomy groove is formed so that the prosthesis can be obliquely implanted, on one hand, it can be guaranteed that the prosthesis is firmly fixed, on the other hand, the human body can be continuously stimulated through the oblique prosthesis, and the bone recovery speed is increased.

The invention provides a tibia osteotomy measuring device. The tibia osteotomy measuring device comprises an eversion angle measuring piece and a base plate, wherein the eversion angle measuring piece and the base plate jointly show an eversion angle; the first end of the first measuring piece can be matched with the lowest position of the inner side of the tibia in an attached mode, the second end of the first measuring piece is arranged in the first sliding seat in a reciprocating motion mode, and the middle of the first measuring piece is movably arranged in the first guide groove; the outer side osteotomy depth measuring mechanism and the inner side osteotomy depth measuring mechanism are arranged in a spaced mode, the first end of the second measuring piece can be matched with the lowest position of the outer side of the tibia in an attached mode, the second end of the second measuring piece is arranged in the first sliding base in a reciprocating motion mode, and the middle of the second measuring piece is movably arranged in the first guide groove; the inner side osteotomy depth measuring mechanism and the outer side osteotomy depth measuring mechanism are both in driving fit with the eversion angle measuring piece. According to the technical scheme, the problem that in the prior art, an osteotomy measuring scale cannot indicate the eversion angle and the osteotomy depth of the inner side and the outer side at the same time is effectively solved.

The utility model discloses a dog tibia horizontal osteotomy bone guide plate which comprises a first guide plate body and a second guide plate body, the inner wall of the first guide plate body and the inner wall of the second guide plate body are each of an arc-shaped structure, and the first guide plate body and the second guide plate body are used for attachment of dog tibia moving positions. Fixing rings are fixedly connected to the inner walls of the first guide plate and the second guide plate, wear-resisting rings are fixedly connected to the inner walls of the fixing rings, and positioning assemblies are inserted into inner cavities of the wear-resisting rings in a penetrating mode and used for multi-angle fixing of the first guide plate and the second guide plate. By means of the arrangement mode that the first guide plate and the second guide plate are matched, the positions of the first guide plate and the second guide plate which are arranged at different angles can be fixed through matching of the fixing ring and the positioning assembly, and the attaching stability of the first attaching plate and the second attaching plate on the outer wall of the tibia is improved; abrasion of the first attaching plate and the second attaching plate to the outer wall of the tibia is reduced, and the application performance of the bone guide plate to dog tibia fixation is improved.

This invention provides a knee joint flexion-extension gap measuring and balancing device, including a base, a pressure measuring mechanism, and a gap measuring mechanism. The base includes a lower support arm and a measuring part. The pressure measuring mechanism includes a pressure measuring block mounted on the measuring part, with two symmetrically arranged pressure measuring sections. A pressure scale is provided on the front surface of each pressure measuring section. The upper support arm is inserted into and movable within the pressure measuring section. The lower and upper support arms are respectively attached to the tibial osteotomy surface and the femoral osteotomy surface, allowing observation of the pressure values ​​on the inner and outer sides of the knee joint. A gap scale is provided on the front surface of each measuring section. An eccentric adjustment mechanism is inserted into the measuring part and the pressure measuring block from the front surface of the measuring section. Rotation of the eccentric adjustment mechanism causes the pressure measuring block to move up and down, allowing observation of the knee joint flexion-extension gap value. This device can directly read the pressure values ​​on both sides of the knee joint and the knee joint gap value, providing accurate values ​​for surgeons and simplifying surgical procedures.

The application relates to the technical field of medical devices and discloses a high-position tibial osteotomy osteotomy surface planning method and system and a storage medium. The method first reconstructs a three-dimensional model based on medical images, constructs a local anatomical coordinate system and an initial osteotomy plane; then constructs an osteotomy parameter geometric constraint model, processes parameter interaction by using a linear constraint equation, realizes linkage update of an osteotomy position, depth and lateral hinge retention amount and safety threshold boundary control; further establishes a virtual distraction model, performs a lower limb mechanical force line path pre-performance, and performs instrument interference detection based on a signed distance field; and finally generates a navigation protocol. The application effectively avoids the risk of lateral hinge fracture through a parameter linkage mechanism, realizes accurate prediction of force line correction effect and active avoidance of surgical risks by combining virtual kinematics simulation, and improves the accuracy and safety of preoperative planning.

Tibial plateau leveling osteotomy (TPLO) bone plates for use in four-legged animals including canines and felines are disclosed. The TPLO bone plates include multiple screw holes positioned on either side of where the bone plate is to overlie the osteotomy. In at least some instances, the bone plates lack an elongated segment to be positioned along the tibia, and therefore do not extend distally along the tibia underneath and beyond the semitendinosus tendon.

The utility model belongs to the technical field of medical instruments, and discloses a knee joint osteotomy guide plate which comprises a guide plate body, a thighbone fitting block and a tibia fitting block, the thighbone fitting block and the tibia fitting block are fixedly arranged at the two ends of the guide plate body respectively, and the thighbone fitting block is provided with a thighbone fitting curved surface fitted with the thighbone side bone surface. The tibia fitting block is provided with a tibia fitting curved surface fitted with the tibia side bone surface; a thighbone positioning hole and a tibia positioning hole are formed in the guide plate main body, and a thighbone osteotomy groove and a tibia osteotomy groove are further formed in the guide plate main body; the tibia osteotomy groove is obliquely formed in the thickness direction of the guide plate body, the two ends of the thighbone osteotomy groove communicate with the two sides of the guide plate body correspondingly, and one end of the tibia osteotomy groove communicates with one side of the guide plate body. The auxiliary osteotomy device is used for assisting osteotomy, the osteotomy accuracy is high, the operation success rate is increased, and the auxiliary osteotomy device is suitable for ankylosing knee osteotomy.

The utility model relates to a total knee arthroplasty tibia osteotomy guide plate and osteotomy assembly.The total knee arthroplasty tibia osteotomy guide plate comprises a guide plate body, a guide block and a positioning claw are arranged on the guide plate body, and the extension direction of the guide block corresponds to the direction of a connecting line of a tibia intercondylar ridge and a posterior cruciate ligament dead point; the positioning claw comprises a binding face, the binding face corresponds to a tibia platform, and a tibia front binding face is arranged on the guide plate body. An osteotomy groove used for performing osteotomy on the proximal tibia is formed in the guide plate main body, a fixing hole is formed in the lower part of the osteotomy groove, and the fixing hole is formed in the side wall of the guide plate main body in a penetrating manner. The osteotomy guide plate positioning device can ensure the accuracy and stability of osteotomy guide plate positioning, avoids the defects caused by one-time cutting in a traditional operation, reduces learning curves of doctors, and is simple and practical.

The present invention relates to the technical field of medical instruments. The purpose is to provide an osteotomy trial mold suitable for use with a guide in lateral unicondylar tibial osteotomy surgery and an osteotomy guide adapted thereto, which can improve the accuracy of surgical osteotomy as an auxiliary tool, greatly shorten the operation time, and reduce the possibility of intraoperative trauma to the patient. An osteotomy trial mold is used to assist in testing and determining the size of osteotomy, including an osteotomy trial mold A part and a B part, wherein the osteotomy trial mold A part includes four connected sections; the osteotomy trial mold B part includes four thin sheets with different widths, a thickness of 1mm, and a length of 5mm; the guide body of the osteotomy guide is provided with an osteotomy longitudinal groove that can be moved laterally on the guide body, the groove width is 2mm, and the groove body direction is the vertical direction, and the inner surface of the groove body matches at least a part of the outer surface of the second section of the osteotomy trial mold so that the second section can be placed in the groove body of the osteotomy longitudinal groove and can be detached from the groove body again.

The present invention discloses a unicompartmental replacement integrated femoral osteotomy guide plate, which belongs to the technical field of medical devices. It comprises an upper guide plate and a lower pad; the shape of the upper guide plate matches the tibial osteotomy platform, the upper surface of the upper guide plate is provided with a central axis in the front-to-back direction, and a plurality of horizontal lines perpendicular to the central axis, and the lower surface of the upper guide plate is provided with at least two positioning columns; the lower pad is provided with positioning holes matching the positioning columns, and the upper guide plate and the lower pad are fixed as a whole through the positioning columns and the positioning holes, and each upper guide plate is provided with a plurality of lower pads of different thicknesses. The central axis of the upper guide plate can be marked and determined, and then the osteotome can be guided by the horizontal line, and the oscillating saw of the osteotome is kept parallel to the horizontal line, so that the femoral prosthesis force line can be accurately controlled within a reasonable range, and accurate femoral side osteotomy can be guided during the operation, and the internal and external valgus or internal and external rotation deviation during the osteotomy process can be controlled within a reasonable range.

The application discloses a device and method for distraction and fixation of tibial osteotomy. The device for distraction and fixation of tibial osteotomy comprises a distraction assembly, which comprises left and right distraction devices arranged detachably. The left distraction device comprises a left turnover plate and a left fixed plate, and the front end of the left turnover plate is hinged to the front end of the left fixed plate. The right distraction device further comprises a right turnover plate and a right fixed plate, and the front end of the right turnover plate is hinged to the front end of the right fixed plate. Adjacent sides of the left and right turnover plates are provided with upper notches, and the rear end openings of the upper notches are used for switching sliding into the sliding entrances of a moving plate and a supporting wedge. The left and right turnover plates are linked through the moving plate. The device further comprises an angle adjusting assembly for controlling the distraction angle of the left and right distraction devices. The application realizes controllable distraction angle, and controls the distraction angle through the rotation angle control of a driving knob.

The invention belongs to the technical field of surgical auxiliary positioning, and discloses an auxiliary positioning device for a tibia longitudinal osteotomy position in unicompartmental knee arthroplasty, which comprises an operating bed, an auxiliary positioning part is arranged on the operating bed, and the auxiliary positioning part comprises an inclined plate support fixedly connected to the operating bed. A fixed clamping plate is hinged to the top end of the inclined plate support, and a rubber clamping plate is fixedly connected into the inner wall of the fixed clamping plate; under the driving of an electric cylinder, an arc-shaped top plate indirectly rotates and generates up-and-down offset motion, so that when an arc-shaped rubber abutting plate is driven to passively move upwards, the shanks of a patient are lifted to rotate inwards and the flexion and extension gap between the femur and the tibia is measured, two shank fixing frame plates can expand in advance, and the motion of the two shank fixing frame plates is prevented from generating interference; therefore, the problem that an assistant manually drives an unconscious patient to do leg flexion and extension movement is solved, and meanwhile, the auxiliary positioning effect of operation on thighs and shanks of the patient can be achieved.