Knee flexion deformity, distal femoral resection with guided osteotomy plate

Abstract

This invention belongs to the field of medical device technology and discloses a distal femoral osteotomy guide plate for treating knee flexion deformity. It includes a first osteotomy device and a second osteotomy device connected together. The first osteotomy device has a first positioning hole and a distal femoral osteotomy hole. The second osteotomy device has a fixation plate with an adjustment device. The adjustment device has symmetrically arranged guide devices one and two, which together position the distal femoral osteotomy. This invention uses the first osteotomy device to perform distal femoral osteotomy, and the second osteotomy device to perform osteotomy in the posterior condyle, posterior oblique, anterior femoral, and anterior oblique directions. This can meet the individualized needs of patients and solve the problem of traditional osteotomy instruments being singular and unadjustable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a femur distal end plus cutting guiding osteotomy plate for knee flexion deformity. BACKGROUND

[0002] The knee joint is one of the most complex joints in the human body and is also an important load-bearing joint of the lower limbs. Due to accidents, bad exercise habits, diseases and other reasons, many patients have different degrees of damage to the knee joint, and their lives are extremely inconvenient.

[0003] For end-stage diseases of the knee joint, such as osteoarthritis, rheumatoid arthritis, traumatic arthritis, and knee joint necrosis, total knee arthroplasty has become an effective treatment, which can effectively relieve pain, restore joint function, and significantly improve the quality of life of patients.

[0004] In knee replacement surgery, especially total knee replacement surgery, the distal femur needs to be cut multiple times to match the shape of the osteotomy surface to the shape of the prosthesis to be implanted. The traditional method usually needs to use multiple osteotomy plates to cut the femoral condyle, the posterior condyle, and the anterior and posterior bevel multiple times, which is extremely inconvenient to use, and multiple switching of the osteotomy plate also increases the osteotomy error, reduces the accuracy of the osteotomy positioning, and at the same time, in traditional surgery, the accuracy of osteotomy and the position of prosthesis implantation mainly depend on the accumulation of experience of the operator, and inexperienced physicians are difficult to implement precise surgical operation, and the most important problem at present is that the standard of intramedullary or extramedullary positioning instruments for conventional surgery is single, which makes it difficult to meet the individual needs of patients.

[0005] Therefore, the present application aims to provide a femur distal end plus cutting guiding osteotomy plate for knee flexion deformity to solve the above problems.

[0006] Through the above analysis, the problems and defects of the prior art are:

[0007] The traditional method usually needs to use multiple osteotomy plates to cut the femoral condyle, the posterior condyle, and the anterior and posterior bevel multiple times, which is extremely inconvenient to use, and multiple switching of the osteotomy plate also increases the osteotomy error, reduces the accuracy of the osteotomy positioning, and at the same time, in traditional surgery, the accuracy of osteotomy and the position of prosthesis implantation mainly depend on the accumulation of experience of the operator, and inexperienced physicians are difficult to implement precise surgical operation, and the most important problem at present is that the standard of intramedullary or extramedullary positioning instruments for conventional surgery is single, which makes it difficult to meet the individual needs of patients. SUMMARY

[0008] In view of the problems existing in the prior art, the present application provides a femur distal end plus cutting guiding osteotomy plate for knee flexion deformity.

[0009] The application is achieved as follows: a knee flexion deformity distal femur plus cutting guide cutting plate comprises:

[0010] The first and second cutting devices are connected, the first cutting device is provided with a first positioning hole and a distal femur cutting hole, the second cutting device is provided with a fixing plate, the fixing plate is provided with a second positioning hole and an adjusting device, the adjusting device is symmetrically provided with a first guide device and a second guide device, and the first and second guide devices together complete the cutting positioning of the front end of the femur.

[0011] Further, the first guide device comprises a front end cutting hole, a front oblique cutting hole and a first connecting rod, the front end cutting hole is located away from the fixing plate, the front oblique cutting hole is located close to the fixing plate, and the first connecting rod is located above the front oblique cutting hole and used for connecting the whole first guide device.

[0012] The second guide device comprises a rear oblique cutting hole, a rear condyle cutting hole and a second connecting rod, the rear condyle cutting hole is located away from the fixing plate, the rear oblique cutting hole is located close to the fixing plate, and the second connecting rod is located above the rear oblique cutting hole and used for connecting the whole second guide device.

[0013] Further, the first guide device is provided with a first guide through hole between the front oblique cutting hole and the front end cutting hole, and the second guide device is provided with a second guide through hole between the rear oblique cutting hole and the rear condyle cutting hole.

[0014] Further, the adjusting device comprises an adjusting knob, a transmission rod, a first conical gear, a second conical gear, a third conical gear, a first adjusting rod and a second adjusting rod, two ends of the transmission rod are fixedly connected with the adjusting knob and the third conical gear respectively, one end of the first adjusting rod is fixedly connected with the first conical gear, and the other end is movably connected with the first guide device, one end of the second adjusting rod is fixedly connected with the second conical gear, and the other end is movably connected with the second guide device, and the third conical gear is engaged with the first and second conical gears.

[0015] Further, the first end of the first guide device away from the fixing plate is provided with a plug, the end of the first cutting device close to the distal femur cutting hole is provided with a pin hole matched with the plug, and the first and second cutting devices are connected through the plug and the pin hole.

[0016] In combination with the above technical solutions and the technical problems solved, the technical solutions of the application have the following advantages and positive effects:

[0017] The application combines various osteotomy requirements into one osteotomy device through the connection design of the first osteotomy device and the second osteotomy device, avoids the error caused by the multiple switching of the osteotomy plate in the traditional method, and improves the stability in the osteotomy operation process;

[0018] The first osteotomy device and the second osteotomy device are respectively provided with accurate positioning holes and osteotomy holes, can accurately guide the osteotomy of a surgical knife, ensure that the osteotomy surface has higher matching degree with a prosthesis, and can effectively reduce the risk of femoral anterior notch injury and other surgical risks;

[0019] The application also comprises an adjusting device arranged on the fixing plate, which can conveniently adjust the positions of the guiding device one and the guiding device two, better adapt to the femur sizes of different patients, customize individual needs for different patients, make the device more suitable for the actual situation of the patients, and improve the operation effect.

[0020] The knee joint flexion deformity femoral distal osteotomy guiding device provided by the application solves the problems of complex structure, poor stability and poor adaptability of the guiding device in the prior art through the modular split structure design of the first osteotomy device and the second osteotomy device.

[0021] The guiding through holes on the guiding device one and the guiding device two can realize real-time observation of the bone quality of the osteotomy region during the operation, avoid the risk of mis-cutting or excessive osteotomy caused by the lack of visual monitoring during the osteotomy process in the prior art, and significantly reduce the overall weight of the guiding plate, reduce the tissue burden of the patient during the operation, improve the operation convenience and structural stability of the device, and effectively guarantee the safety and accuracy during the operation.

[0022] The application introduces a bevel gear linkage adjustment system, accurately controls the relative position and angle of the guiding device one and the guiding device two through the cooperation of the transmission rod, the adjusting knob, the bevel gear set and the adjusting rod. Compared with the single-direction adjusting mechanism in the prior art, the application can realize flexible adjustment of multi-dimensional osteotomy guiding, thereby being suitable for the differences of individual anatomical structures of different patients. The structure design significantly enhances the adaptability and wide applicability of the device, improves the accuracy of femoral osteotomy and the individual customization ability.

[0023] The application improves the stability and controllability of the connection between the first osteotomy device and the second osteotomy device during the osteotomy process through the detachable connection structure of the bolt and the pin hole. Unlike the existing technology which relies on simple screw fixation, the bolt connection structure of the application improves the connection strength while facilitating the quick assembly and disassembly of the components during the operation, significantly optimizing the process and efficiency of the operation. The overall design not only improves the practicality of the device in complex surgical environment, but also enhances the durability and reusability of the guide device. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a front structure schematic diagram of the second osteotomy device provided by the embodiment of the application;

[0025] Figure 2 is a side structure schematic diagram of the second osteotomy device provided by the embodiment of the application;

[0026] Figure 3 is a structure schematic diagram of the first osteotomy device provided by the embodiment of the application;

[0027] Figure 4 is a structure schematic diagram of the adjusting device provided by the embodiment of the application.

[0028] In the figure: 1, first osteotomy device; 11, first positioning hole; 12, distal femur osteotomy hole; 2, second osteotomy device; 21, guide device one; 211, front osteotomy hole; 212, front oblique osteotomy hole; 213, connecting rod one; 214, guide through hole one; 22, guide device two; 221, rear oblique osteotomy hole; 222, rear condyle osteotomy hole; 223, connecting rod two; 224, guide through hole two; 23, fixed plate; 231, second positioning hole; 3, adjusting device; 31, adjusting knob; 32, transmission rod; 33, conical gear three; 34, adjusting rod one; 35, conical gear one; 36, adjusting rod two; 37, conical gear two; 4, bolt; 5, pin hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the application clearer and more apparent, the application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0030] The degree of knee flexion deformity and distal femur osteotomy parameters are determined by X-ray or CT three-dimensional reconstruction technology before operation, and the direction, angle and thickness of osteotomy are determined. During the implementation of osteotomy, the first positioning hole of the first osteotomy device is fixed on the distal femur by means of Kirschner wire or orthopedic positioning screw, and the distal femur osteotomy is accurately implemented by means of swing saw or reciprocating saw, at this time the second osteotomy device is stably connected with the first osteotomy device through the pin connection structure, and provides rigid limiting support for the distal femur osteotomy position, prevents osteotomy deviation and ensures the accuracy of the osteotomy plane.

[0031] After the distal osteotomy is completed, the first osteotomy device is removed by releasing the pin connection structure, and the integrated bevel gear linkage adjustment system on the second osteotomy device is started, that is, the rotation adjustment knob is rotated, the power transmission is realized through the transmission rod and the bevel gear set (bevel gears one, two and three), and then the relative positions of the guide device one and the guide device two are adjusted, so that the osteotomy channel accurately matches the individual anatomic differences of the patient's femur, effectively meeting the individual needs of different patients' femoral condyle osteotomy angle and position.

[0032] After the second osteotomy device is accurately adjusted and fixed on the distal femur, it is stably fixed by means of orthopedic fixation screws or guide pins through the second positioning hole on the fixed plate. By means of swing saw or reciprocating saw, first, the distal femur osteotomy is implemented through the front end osteotomy hole, and a standardized osteotomy surface is established to accurately match the anatomy of the patient's femur.

[0033] Subsequently, further posterior oblique osteotomy and posterior condyle osteotomy are implemented along the osteotomy guide hole of the guide device two, the posterior oblique osteotomy is implemented through the posterior oblique osteotomy hole to accurately match the posterior condyle slope of the prosthesis, and the posterior condyle plane osteotomy is implemented through the posterior condyle osteotomy hole to perfect the anatomic configuration of the intercondylar fossa and the posterior condyle of the femur. This step is very important, and accurate posterior oblique and posterior condyle osteotomy together guarantee the biomechanical function of the femoral prosthesis and the symmetrical balance of the tibiofemoral joint.

[0034] During the osteotomy operation, the bone quality of the femoral osteotomy surface is monitored in real time through the guide through hole (guide through hole one and guide through hole two) on the guide device one and the guide device two, the osteotomy process and depth of the cortical bone and cancellous bone are judged in time, the consistency of the osteotomy thickness and anatomic parameters during operation is guaranteed, the mis-cut or excessive osteotomy is avoided, the weight of the guide plate is effectively reduced, the tissue burden and operation time of the patient during operation are reduced, and the stability of the guide plate during operation is further improved.

[0035] After the distal femur and the anterior and posterior oblique osteotomies are completed, the fixation screws and the osteotomy guide plate device are removed, the osteotomy interface is thoroughly irrigated during the operation, and the knee joint prosthesis that accurately matches the osteotomy surface formed during the operation is stably implanted and fixed by using the bone cement interface technology (polymethyl methacrylate, PMMA). This prosthesis fixation method can effectively enhance the biological stability of the implant and the osteotomy interface of the femur, optimize the stress distribution of the weight bearing, ultimately restore the normal biomechanical function of the knee joint of the patient, and achieve the long-term clinical success rate and functional reconstruction goal of the osteotomy.

[0036] As Figures 1-4 mentioned, the embodiment: the knee joint flexion deformity femoral distal plus cutting guide osteotomy plate, including first osteotomy device 1 and second osteotomy device 2, first osteotomy device 1 and second osteotomy device 2 are connected through the pin 4 and the insertion hole; The first positioning hole 11 is arranged on the first osteotomy device 1, and the femoral distal osteotomy hole 12 is arranged on the first osteotomy device 1, which is used for osteotomy operation on the direction of the distal femur; The second osteotomy device 2 is provided with a fixed plate 23, and the second positioning hole 231 is arranged on the fixed plate 23; The adjusting device 3 is arranged on the fixed plate 23, the symmetrically connected guiding device one 21 and guiding device two 22 are arranged on the adjusting device 3, the adjusting device 3 can adjust the position of the guiding device one 21 and the guiding device two 22, and can meet the individual needs of patients.

[0037] The guiding device one 21 in the embodiment includes a front end osteotomy hole 211, a front oblique osteotomy hole 212 and a connecting rod one 213; The front end osteotomy hole 211 is located away from the fixed plate 23, the front oblique osteotomy hole 212 is located close to the fixed plate 23, the front end osteotomy hole 211 can be used for osteotomy on the front end of the femur, and the front oblique osteotomy hole 212 is used for osteotomy on the front oblique direction of the femur, wherein the connecting rod one 213 is located on the upper surface of the front oblique osteotomy hole 212 and is used for connecting the whole guiding device one 21;

[0038] The guiding device two 22 includes a rear oblique osteotomy hole 221, a rear condyle osteotomy hole 222 and a connecting rod two 223; The rear condyle osteotomy hole 222 is located away from the fixed plate 23, the rear oblique osteotomy hole 221 is located close to the fixed plate 23, the rear oblique osteotomy hole 221 can be used for osteotomy on the rear oblique direction of the femur, the rear condyle osteotomy hole 222 is used for osteotomy on the rear condyle direction, and the connecting rod two 223 is located on the upper surface of the rear oblique osteotomy hole 221 and is used for connecting the whole guiding device two 22. Finally, the osteotomy positioning of the front end of the femur is completed by the cooperation of the guiding device one 21 and the guiding device two 22.

[0039] Preferably, the guiding device one 21 is provided with a guiding hole one 214, which is located between the front oblique osteotomy hole 212 and the front end osteotomy hole 211; the guiding device two 22 is provided with a guiding hole two 224, which is located between the rear oblique osteotomy hole 221 and the rear condyle osteotomy hole 222; the guiding hole one 214 and the guiding hole two 224 can facilitate the observation of the bone condition during the osteotomy process, thereby improving the accuracy of the operation; at the same time, the guiding hole one 214 and the guiding hole two 224 can reduce the weight of the overall device, reduce the burden of the patient during the operation, and better fix the patient's operation position, thereby improving the stability of the overall device.

[0040] The adjusting device 3 in the embodiment includes an adjusting knob 31, a transmission rod 32, a bevel gear one 35, a bevel gear two 37, a bevel gear three 33, an adjusting rod one 34, and an adjusting rod two 36; the two ends of the transmission rod 32 are fixedly connected with the adjusting knob 31 and the bevel gear three 33, respectively; one end of the adjusting rod one 34 is fixedly connected with the bevel gear one 35, and the other end is movably connected with the guiding device one 21; one end of the adjusting rod two 36 is fixedly connected with the bevel gear two 37, and the other end is movably connected with the guiding device two 22; the bevel gear three 33 is engaged with the bevel gear one 35 and the bevel gear two 37 at the same time, so that rotating the adjusting knob 31 can adjust the positions of the guiding device one 21 and the guiding device two 22, and better adapt to the femur sizes of different patients, and individual customization can be performed for different patients.

[0041] The guiding device one 21 in the embodiment is provided with a plug 4 at the end away from the fixed plate 23; the first osteotomy device 1 is provided with a pin hole 5 matched with the plug 4 at the end close to the femur distal osteotomy hole 12; the first osteotomy device 1 and the second osteotomy device 2 are connected through the plug 4 and the pin hole, so that the overall device has better stability, and the stability during the osteotomy process can also be ensured because the first osteotomy device 1 and the second osteotomy device 2 abut against the femur, thereby improving the accuracy of the osteotomy operation.

[0042] Working principle: In use, after measuring the femur, the first osteotomy device 1 is fixed on the femur by the positioning screw through the first positioning hole 11, and the distal femur is cut through the distal femur osteotomy hole 12 by using a conventional swing saw or reciprocating saw. At this time, the second osteotomy device 2 abuts against the distal femur osteotomy direction to maintain stability during the osteotomy process. When the distal femur osteotomy direction is cut, the fixing screw of the first positioning hole 11 is removed, the positions of the guide device one 21 and the guide device two 22 are adjusted by the adjusting device 3, which can be suitable for the size of the femur of different patients, and then the second osteotomy device 2 is stably fixed on the front end of the femur by the fixing screw through the second positioning hole 231. The front end of the femur is cut in the front end osteotomy direction by using a conventional swing saw or reciprocating saw, the front oblique osteotomy direction is cut by passing through the front oblique osteotomy hole 212, the rear oblique osteotomy direction is cut by passing through the rear oblique osteotomy hole 221, and the posterior condyle osteotomy direction is cut by passing through the posterior condyle osteotomy hole 222. After the osteotomy is completed, the fixing screw and the osteotomy plate are removed, the implant prosthesis matched with the shape of the osteotomy surface is fixed on the osteotomy surface by using bone cement, and the knee replacement surgery is completed.

[0043] Specific implementation of the present application:

[0044] First: preliminary fixation and measurement of the device

[0045] Before the operation starts, the surgeon first measures the distal femur of the patient using imaging methods to determine the precise position and angle of the osteotomy. Then, the first osteotomy device 11 is fixed on the distal femur by the positioning screw through the first positioning hole 11, ensuring that the device is stable and does not move during the operation. The distal femur osteotomy hole 12 is designed to provide a precise osteotomy reference position, so that the surgeon can use a swing saw or reciprocating saw to perform a standardized osteotomy operation, ensuring the symmetry and angle of the distal femur osteotomy meet the requirements of the operation.

[0046] Second: osteotomy operation of the first osteotomy device

[0047] When the first osteotomy device 11 is fixed on the distal femur, the surgeon uses a swing saw or reciprocating saw to cut along the distal femur osteotomy hole 1212. At this time, the second osteotomy device 22 is tightly connected with the first osteotomy device 11 through the pin 44 and the hole, and supports each other during the osteotomy process, so that the device remains stable during the operation, thereby preventing deviation during cutting. After the osteotomy is completed, the surgeon removes the fixing screw at the first positioning hole 1111 to adjust the second osteotomy device 22 for the next step of the operation.

[0048] Third: personalized adjustment and adaptation

[0049] According to the femoral size of different patients, the doctor uses the adjusting device 33 for personalized adjustment to ensure that the osteotomy direction and angle meet the patient's physiological anatomy. The adjusting device 33 is driven by the adjusting knob 31, and the conical gear three 33, the conical gear one 35, and the conical gear two 37 are meshed to drive the adjusting rod 34 and the adjusting rod 36 to adjust the relative position of the guide device one 21 and the guide device two 22. After adjustment, the doctor fixes the second osteotomy device 22 to the front end of the femur through the second positioning hole 231 by the fixing screw to ensure the stability during the osteotomy process.

[0050] Fourth: accurate osteotomy of the guide device

[0051] When the second osteotomy device 22 is fixed, the doctor uses a swing saw or a reciprocating saw to pass through each guide osteotomy hole in turn to perform accurate osteotomy. Specifically, the swing saw passes through the front osteotomy hole 211 to perform osteotomy on the front end of the femur, passes through the front oblique osteotomy hole 212 to perform osteotomy on the front oblique direction of the femur, passes through the rear oblique osteotomy hole 221 to perform osteotomy on the rear oblique direction of the femur, and passes through the posterior condyle osteotomy hole 222 to perform osteotomy on the posterior condyle direction of the femur. The guide through hole one 214 and the guide through hole two 224 provide an additional field of view, allowing the doctor to monitor the bone condition during the osteotomy process to ensure the accuracy of the osteotomy and optimize the convenience of the operation.

[0052] Fifth: removal of the osteotomy plate and implantation of the prosthesis

[0053] After completing all necessary osteotomy operations, the doctor first removes all fixing screws and carefully removes the first osteotomy device 11 and the second osteotomy device 22. Since the entire osteotomy process uses multi-point positioning and guiding design, the final osteotomy surface can closely match the prosthesis, thereby providing a stable prosthesis support foundation. The doctor then selects a prosthesis that matches the shape of the osteotomy surface and uses bone cement to fix it to ensure the long-term stability and resistance of the prosthesis, thereby improving the success rate of the operation and the postoperative rehabilitation effect.

[0054] Sixth: stability and optimization of the device

[0055] The device uses the connection method of the latch 44 and the pin hole 55 to provide additional mechanical support during the osteotomy process, thereby improving the overall stability. In addition, the guide device one 21 and the guide device two 22 are accurately adjusted by the adjusting device 33 to adapt to the individual needs of different patients and maintain high precision during the osteotomy process. The design of the guide through hole one 214 and the guide through hole two 224 not only reduces the weight of the device but also enhances the visualization capability of the operation, allowing the doctor to check the bone condition at any time to ensure the quality of the osteotomy. The design of the present invention provides a more efficient, safe, and stable solution for the correction of knee flexion deformity, which provides important support for clinical orthopedic surgery.

[0056] The following are four specific embodiments of the distal femoral guiding osteotomy plate for knee flexion deformity:

[0057] Example 1: Standardized knee flexion deformity correction surgery

[0058] Background:

[0059] A 65-year-old male patient suffered from long-term knee osteoarthritis leading to flexion deformity, unable to walk normally. Imaging examination showed that there was severe deformation in the distal femur, which needed to be corrected by osteotomy to restore the normal biomechanical structure of the knee joint.

[0060] Implementation process:

[0061] 1. Preliminary fixation: After determining the osteotomy angle of the distal femur using image navigation, the first osteotomy device 11 is fixed in the distal femur through the first positioning hole 11 with a positioning screw.

[0062] 2. Distal osteotomy: Standardized osteotomy is performed along the distal femoral osteotomy hole 12 using a swing saw, while maintaining stable support of the second osteotomy device 22 and the femur.

[0063] 3. Personalized adjustment: Adjust the guide device one 21 and the guide device two 22 to adapt to the patient's bone size by rotating the adjustment knob 31 using the adjustment device 33.

[0064] 4. Anterior and posterior osteotomy: Precise osteotomy is performed by using a swing saw or a reciprocating saw through the anterior osteotomy hole 211, the anterior oblique osteotomy hole 212, the posterior oblique osteotomy hole 221, and the posterior condyle osteotomy hole 222.

[0065] 5. Prosthesis implantation: Remove the fixation screws and osteotomy plate, install the knee prosthesis that matches the shape of the osteotomy surface, and complete the surgery after fixation.

[0066] Advantages:

[0067] Provides precise multi-angle osteotomy to ensure knee biomechanical alignment.

[0068] Uses a double-layer positioning structure to improve osteotomy stability and reduce intraoperative errors.

[0069] Example 2: Osteotomy correction for complex knee contracture cases

[0070] Background:

[0071] A 50-year-old female suffered from long-term contracture of the knee joint due to rheumatoid arthritis, with flexion deformity exceeding 40°, making it difficult for traditional correction methods to restore her normal gait.

[0072] Implementation process:

[0073] 1. Preoperative planning: Determine the distal femur osteotomy range with the help of CT and 3D modeling software, and simulate the postoperative angle recovery.

[0074] 2. Intraoperative adjustment: After fixing the distal femur with the first osteotomy device 11, adjust the second osteotomy device 22 to match the patient's anatomical characteristics.

[0075] 3. Precise osteotomy guidance: Rotate the adjustment knob 31, adjust the guide device one 21 and the guide device two 22 through the gear set, and complete the distal, anterior and posterior condyle osteotomy at different osteotomy hole positions.

[0076] 4. Postoperative recovery: Remove the fixation device and implant the custom prosthesis to adapt to the postoperative physiological curve of the knee joint.

[0077] Advantages:

[0078] Combining image navigation and personalized adjustment mechanism, precise correction of high-difficulty cases is realized.

[0079] The guide hole design makes the osteotomy more uniform and reduces the risk of postoperative complications.

[0080] Example 3: Traumatic knee deformity repair

[0081] Background:

[0082] A 40-year-old male had poor healing of the distal femur fracture after a traffic accident, resulting in knee flexion deformity and affecting gait, requiring osteotomy correction and implantation of joint prosthesis.

[0083] Implementation process:

[0084] 1. Preoperative evaluation: Preoperative CT is taken to evaluate the degree of deformity and develop a correction plan.

[0085] 2. Fixation device: Fix the first osteotomy device 11 to the distal femur, connect the second osteotomy device 22 through the pin hole 55, and provide stable support.

[0086] 3. Intraoperative osteotomy:

[0087] First, perform standard osteotomy along the distal femur osteotomy hole 12;

[0088] Adjust the guide device one 21 and the guide device two 22 in turn, and perform multi-angle osteotomy through the anterior osteotomy hole 211 and the posterior oblique osteotomy hole 221 to reshape the femur.

[0089] 4. Prosthesis replacement: Remove the fixation device, install the prosthesis, and use bone cement to fix it.

[0090] Advantages:

[0091] Multi-angle osteotomy is used to repair the asymmetric healing problem of post-traumatic fractures.

[0092] Provides osteotomy support with fixation device, reduces intraoperative fracture risk.

[0093] Example 4: Correction of congenital knee deformity

[0094] Background:

[0095] A 30-year-old male patient with congenital femoral deformity caused knee flexion deformity, long-term walking limited, need to be corrected by distal osteotomy.

[0096] Implementation process:

[0097] 1. Preoperative image analysis: CT scan shows that the patient's distal femur is abnormally short and the joint arrangement is abnormal.

[0098] 2. Intraoperative positioning: After fixing the distal femur with the first osteotomy device 11, adjust the adjustment device 33 to adapt to different osteotomy positions to meet the individual correction needs.

[0099] 3. Multi-level osteotomy:

[0100] First, use the distal osteotomy hole 12 for preliminary osteotomy;

[0101] Use the front oblique osteotomy hole 212 and the rear oblique osteotomy hole 221 in turn for additional correction to optimize joint alignment.

[0102] 4. Orthopedic implantation: After surgery, implant a customized prosthesis to restore normal knee joint mobility.

[0103] Advantages:

[0104] Suitable for patients with congenital abnormalities, providing highly personalized correction solutions.

[0105] Optimize osteotomy angle through adjustment device to improve postoperative knee joint stability.

[0106] The above four examples cover a variety of application scenarios, including standard osteotomy correction, complex joint deformity repair, post-traumatic deformity repair, and congenital abnormality correction.

[0107] The knee flexion deformity distal femur plus osteotomy guiding osteotomy plate of the present invention has:

[0108] 1. High stability: uses a double-layer fixation structure to reduce intraoperative errors.

[0109] 2. Individual adjustment: the guiding device can be adjusted according to patient needs to adapt to different femur sizes.

[0110] 3. Precise osteotomy: multi-level guiding hole design ensures osteotomy accuracy and optimizes prosthesis implantation effect.

[0111] The device provides a safe, stable and adjustable solution for knee arthrotomy correction surgery, improves the success rate of surgery and reduces the occurrence of postoperative complications.

[0112] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any modification, equivalent replacement and improvement within the technical range disclosed by the present application and within the spirit and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A knee flexion deformity distal femur plus cut guide cutting block, characterized by, The knee flexion deformity distal femur plus cutting guide cutting plate comprises: A first cutting device and a second cutting device, the first cutting device is provided with a first positioning hole and a distal femur cutting hole; the second cutting device comprises a fixing plate and an adjusting device, the fixing plate is provided with a second positioning hole, and the adjusting device is connected with a first guide device and a second guide device; the first guide device comprises a front end cutting hole, a front oblique cutting hole and a connecting rod one; the second guide device comprises a rear oblique cutting hole, a rear condyle cutting hole and a connecting rod two; the first cutting device and the second cutting device are detachably connected through a plug and a pin hole; The adjusting device comprises an adjusting knob, a transmission rod, a conical gear one, a conical gear two, a conical gear three, an adjusting rod one and an adjusting rod two; the two ends of the transmission rod are connected with the adjusting knob and the conical gear three respectively; the conical gear three is engaged with the conical gear one and the conical gear two at the same time; the conical gear one is connected with the adjusting rod one, and the conical gear two is connected with the adjusting rod two; The adjusting rod one is movably connected with the first guide device, and the adjusting rod two is movably connected with the second guide device.

2. The knee flexion deformity distal femoral cut guiding cut block of Claim 1, wherein, The first guide device is provided with a guide through hole one, and the guide through hole one is located between the front oblique cutting hole and the front end cutting hole.

3. The knee flexion deformity distal femoral cut guiding cut block of Claim 1, wherein, The second guide device is provided with a guide through hole two, and the guide through hole two is located between the rear oblique cutting hole and the rear condyle cutting hole.

4. The knee flexion distal femoral cut guide cut block of Claim 1, wherein, The plug is arranged at one end of the first guide device away from the fixing plate, and the pin hole is arranged at one end of the first cutting device close to the distal femur cutting hole.

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