Knee joint inner side unicondylar replacement prosthesis center line measurer

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a knee joint inner side unicompartmental knee replacement prosthesis center line measurer. The utility model provides a knee joint inner side single condyle replacement prosthesis midline measurer, and aims to solve the problem that in the prior art, a femur inner side condyle midline is not provided with a measuring tool, so that the determination error of the femur condyle midline is large. A knee joint inner side unicondylar replacement prosthesis center line measurer comprises a main board and a positioning block arranged at one end of the main board, the main board is further provided with an auxiliary measuring board, and the auxiliary measuring board is arranged at the end, close to the positioning block, of the main board; according to the utility model, the positioning groove on the positioning block is contacted with the surface of the thighbone inner side condyle, and the center line auxiliary line is arranged in the positioning groove, so that a doctor can visually see and determine the position of the center line of the thighbone inner side condyle. By means of the design, errors caused by manual judgment or tool limitation in a traditional method are avoided, and the measurement accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a knee joint medial unicompartmental replacement prosthesis middle line measuring device. BACKGROUND

[0002] Knee unicompartmental replacement has developed rapidly in recent years and gradually popularized in hospitals, especially medial unicompartmental replacement surgery, which has a large amount and good treatment effect, but there is no specific measuring tool for the femoral medial condyle middle line in the operation, and the middle line is drawn by visual observation or the osteotomy guide plate is placed in the middle of the vertical tibial osteotomy surface by visual observation. There is deviation in the middle line drawn by visual observation or the osteotomy guide plate placed in the middle of the vertical tibial osteotomy surface. CONTENT OF UTILITY MODEL

[0003] The utility model provides a knee joint medial unicompartmental replacement prosthesis middle line measuring device, and aims to solve the problem of large error in determination of femoral condyle middle line caused by lack of measuring tool for femoral medial condyle middle line in the prior art.

[0004] In order to solve the above technical problems, the utility model adopts the technical scheme that:

[0005] A knee joint medial unicompartmental replacement prosthesis middle line measuring device, comprising a main plate and a positioning block arranged at one end of the main plate, and an auxiliary measuring plate arranged on the main plate and close to one end of the positioning block;

[0006] The positioning block is provided with a positioning groove, the bottom wall of the positioning groove is arc-shaped, and the bottom wall of the positioning groove is in surface contact with the unicompartment to be measured;

[0007] The auxiliary measuring plate is arranged on the main plate at a position corresponding to the middle part of the positioning groove, and a middle line auxiliary line is arranged in the positioning groove.

[0008] Further improved scheme: the thickness of the positioning block is greater than the thickness of the main plate, and the bottom surface of the positioning block is flush with the bottom surface of the main plate.

[0009] Based on the above technical scheme: the thickness of the positioning block is greater than the thickness of the main plate, and the bottom surface of the positioning block is flush with the bottom surface of the main plate, which helps to ensure that the measuring device can be stably and accurately attached to the femoral medial condyle when placed, thereby reducing the measurement error. The traditional measurement method may be affected by various human factors such as doctor's experience and visual angle, resulting in error in the measurement result, and the present scheme realizes accurate positioning through the positioning block, reduces the interference of human factors, and improves the objectivity and accuracy of the measurement.

[0010] Further improved scheme: the height of the lowest position of the positioning groove is higher than the height of the top surface of the main plate.

[0011] Based on the above technical scheme: the design of the positioning groove makes the measurer more accurately capture the position of the midline when contacting the medial femoral condyle. Because the lowest position of the positioning groove is higher than the top surface of the main plate, when the measurer is placed on the medial femoral condyle, the edge of the groove can more accurately fit on the surface of the femur, thereby reducing the measurement error. Traditional measurement methods may deviate due to uneven contact surface or improper placement of measurement tools. The positioning groove of the design can effectively avoid these problems and ensure the accuracy of the measurement results.

[0012] Further improved scheme: the main plate includes a first part and a second part arranged at one end of the first part, and the positioning block is arranged on the first part through the second part, and the second part extends to one side of the first part.

[0013] Based on the above technical scheme: the second part extends to one side of the first part, providing more stable support for the positioning block. This structural design helps to prevent the positioning block from shaking or shifting during measurement, thereby ensuring the accuracy of the measurement. By connecting the positioning block to the first part through the second part, the overall structural stability of the main plate is enhanced. This design makes the measurer more durable during use and can withstand greater external force and pressure. Since the positioning block is stably connected to the first part through the second part, it can more accurately locate the midline position of the medial femoral condyle. This design helps to reduce measurement error and improve measurement accuracy.

[0014] Further improved scheme: the positioning block and the second part are of an integrated structure, and the second part and the first part are of an integrated structure.

[0015] Based on the above technical scheme: the integrated structure design eliminates the gaps or interfaces that may exist in traditional connection methods, thereby avoiding the problem of unstable structure caused by loose or damaged connecting parts. This design makes the overall structure of the measurer more stable, which can withstand greater external force and pressure, improving the durability of the measurer. Since the connecting parts and interfaces are eliminated, the integrated structure design reduces the potential failure points. This means that the likelihood of failure of the measurer during use is greatly reduced, thereby improving the reliability and stability of the measurer. The integrated structure design avoids measurement errors caused by loose connecting parts or mismatched interfaces. The seamless connection between the positioning block and the second part, and the second part and the first part ensures the stability and accuracy of the measurer during measurement, thereby improving the measurement precision. Since the integrated structure design eliminates the influence of individual differences and manufacturing errors on measurement precision, the measurement results of different measurers are more consistent. This helps doctors make more accurate judgments and decisions during surgery.

[0016] Further improved scheme: the auxiliary measurement plate is arranged on the second part.

[0017] Based on the above technical scheme: the auxiliary measurement plate can provide an additional reference plane for the doctor, helping the doctor to more accurately locate the medial condyle of the femur. By combining the markings or scales on the main plate and the auxiliary measurement plate, the doctor can more accurately measure and record relevant data. Traditional measurement methods may be affected by various factors, such as the doctor's perspective, hand stability, etc., resulting in measurement errors. The setting of the auxiliary measurement plate can reduce the influence of these factors to some extent, improving the accuracy of measurement. The auxiliary measurement plate not only can be used as a measuring tool, but also can integrate other functions such as marking, guiding, etc. This multifunctional integrated design makes it more convenient for doctors to perform various operations during surgery, improving surgical efficiency.

[0018] Further improved scheme: the auxiliary measurement plate and the second part are of an integrated structure, and the upper end of the auxiliary measurement plate is further provided with a convex part for facilitating measurement, which protrudes from the auxiliary measurement plate towards the direction of the positioning block.

[0019] Based on the above technical scheme: the integrated structure design eliminates the connection gap between the auxiliary measurement plate and the second part, avoiding measurement errors and safety hazards caused by loose or damaged connecting parts. This design makes the overall structure of the measuring device more stable, capable of withstanding various challenges during surgery, improving durability. Since an integrated structure is adopted, potential failure points are reduced, reducing maintenance costs and time. At the same time, this design also helps to improve the reliability of the measuring device, ensuring the smooth progress of the surgery. The convex part makes the measurement process more intuitive and accurate. Doctors can quickly determine the position of the center line by observing the contact between the convex part and the medial condyle of the femur, without the need for additional auxiliary tools or complex calculation processes. The presence of the convex part simplifies the measurement steps, allowing doctors to complete the measurement work more quickly, thereby shortening the surgery time and improving the surgery efficiency.

[0020] Further improved scheme: the auxiliary measurement plate is installed on the second part through a connecting assembly, the second part is provided with a vertical plate, the lower end of the auxiliary measurement plate is rotationally connected to the auxiliary measurement plate through a rotating shaft, a positioning sleeve for positioning the auxiliary measurement plate is sleeved on the vertical plate, the auxiliary measurement plate includes a storage state and a working state, when the auxiliary measurement plate is in the working state, part of the auxiliary measurement plate and part of the vertical plate are located in the positioning sleeve, when the auxiliary measurement plate is in the storage state, the auxiliary measurement plate is separated from the positioning sleeve.

[0021] Based on the above technical scheme: the auxiliary measurement plate is rotatably connected to the vertical plate through the rotating shaft, realizing flexible conversion from the storage state to the working state. This design not only saves space, but also makes the measurer more compact when not in use, facilitating carrying and storage. The auxiliary measurement plate can provide accurate measurement function in the working state, while in the storage state, it does not occupy additional space. This design gives the measurer more use scenarios and flexibility. When the auxiliary measurement plate is in the working state, part of it and part of the vertical plate are located in the positioning sleeve. This design ensures the stability and accuracy of the auxiliary measurement plate during measurement. The presence of the positioning sleeve prevents the auxiliary measurement plate from shaking or deviating during measurement, thereby improving measurement accuracy. Through precise positioning of the positioning sleeve, the auxiliary measurement plate can closely adhere to the surface of the medial condyle of the femur, reducing measurement errors caused by the gap between the measurement plate and the femoral surface. Users can easily convert the auxiliary measurement plate from the storage state to the working state without the need for additional tools or complex steps. This design makes the measurement process smoother and more efficient. In the storage state, the auxiliary measurement plate is separated from the positioning sleeve, making the measurer more compact as a whole, facilitating carrying and storage. This is particularly important for doctors who need to perform surgery at different locations.

[0022] Further improved scheme: a spring is arranged between the second part and the positioning sleeve, one end of the spring is fixed on the second part, the other end of the spring is in contact with the positioning sleeve, and the spring is sleeved on the vertical plate.

[0023] Based on the above technical scheme: one end of the spring is fixed on the second part, and the other end is in contact with the positioning sleeve. When the auxiliary measurement plate is converted from the storage state to the working state, the spring force will push the positioning sleeve to move upward along the vertical plate until the part of the auxiliary measurement plate is tightly locked in the sleeve. This design realizes automatic positioning of the auxiliary measurement plate without manual adjustment, improving measurement efficiency. Once the auxiliary measurement plate is locked by the positioning sleeve, the spring force will keep the sleeve in close contact with the measurement plate, preventing the measurement plate from shaking or deviating during use. This stable locking mechanism ensures the accuracy and stability of the measurement. Users only need to perform simple operations to switch the auxiliary measurement plate from the storage state to the working state. The spring force automatically completes the movement and locking process of the positioning sleeve, without the need for additional adjustment or operation by the user. In the storage state, the spring force makes the positioning sleeve retract to the initial position and separate from the auxiliary measurement plate. This design not only saves space, but also makes the measurer more compact and convenient to carry and store.

[0024] Further improved scheme: the center line auxiliary line is recessed into the bottom wall of the positioning groove, and a paint layer is coated on the center line auxiliary line to facilitate observation of the center line auxiliary line.

[0025] Based on the above technical scheme: the middle line auxiliary line is directly concave into the bottom wall of the positioning groove, which provides a direct and accurate reference line for the doctor. This helps the doctor quickly locate the middle line of the medial condyle of the femur during the operation, reducing errors caused by human judgment. The paint layer makes the middle line auxiliary line more visible during the operation. Even in low light or limited surgical field, the doctor can easily identify the middle line position to ensure the accuracy of the operation. The presence of the middle line auxiliary line reduces the risk of misoperation during the operation. The doctor can accurately implant and position the prosthesis according to the middle line auxiliary line, avoiding complications caused by improper prosthesis position. By quickly locating the middle line, the doctor can save operation time and reduce the patient's exposure time on the operating table, thereby reducing the risk of operation.

[0026] The beneficial effects of the present utility model are:

[0027] The present utility model through the positioning groove on the positioning block and the face contact of the medial condyle of femur, and the middle line auxiliary line set in the positioning groove, the doctor can directly see and determine the middle line position of the medial condyle of femur. This design avoids the error caused by human judgment or tool limitation in traditional method, improves the accuracy of measurement. The bottom wall of the positioning groove is designed as an arc, which can better fit the medial condyle of femur of different patients, ensuring that the measurement accuracy is not affected by individual differences. Accurate middle line measurement helps the doctor implant the prosthesis more accurately during the operation, ensuring that the position and direction of the prosthesis match the natural anatomical structure of the patient. This not only improves the success rate of the operation, but also reduces the occurrence of postoperative complications. Since the prosthesis implantation is more accurate, the patient recovers faster and better after the operation, thereby improving the patient's satisfaction and quality of life.

[0028] The present utility model is simple and clear in design, and the doctor can quickly complete the middle line measurement without complex operation steps. This helps to shorten the operation time and improve the operation efficiency. By integrating the middle line auxiliary line into the positioning groove, the doctor does not need to use other measurement tools to determine the middle line position, thereby reducing the use and replacement frequency of auxiliary tools during the operation. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the embodiments of the present utility model, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and should not be regarded as a limitation on the scope. For ordinary skilled in the art, without creative labor, other related drawings can also be obtained from these drawings.

[0030] Fig. 1It is the main view of the knee joint medial single condyle replacement prosthesis center line measuring device.

[0031] Fig. 2 It is the left view of the knee joint medial single condyle replacement prosthesis center line measuring device.

[0032] Fig. 3 It is the schematic view of the knee joint medial single condyle replacement prosthesis center line measuring device.

[0033] Explanation of reference numerals in the drawing:

[0034] 1-main board;2-positioning block;3-assistant measuring plate;4-positioning groove;5-center line assistant line;6-first part;7-second part;8-convex part. Specific implementation

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0036] Reference Figs. 1 to 3 A knee joint medial single condyle replacement prosthesis center line measuring device, comprising a main board 1 and a positioning block 2 arranged at one end of the main board 1, and an assistant measuring plate 3 arranged on the main board 1, wherein the assistant measuring plate 3 is arranged at one end of the main board 1 close to the positioning block 2.

[0037] The positioning block 2 is provided with a positioning groove 4, the bottom wall of the positioning groove 4 is arc-shaped, and the bottom wall of the positioning groove 4 is in surface contact with the single condyle to be measured.

[0038] The assistant measuring plate 3 is arranged on the main board 1 at a position corresponding to the middle part of the positioning groove 4, and the positioning groove 4 is provided with a center line assistant line 5.

[0039] Specifically, the thickness of the positioning block 2 is greater than the thickness of the main plate 1, and the bottom surface of the positioning block 2 is flush with the bottom surface of the main plate 1. The lowest position of the positioning groove 4 is higher than the height of the top surface of the main plate 1. The main plate 1 comprises a first part 6 and a second part 7 arranged at one end of the first part 6, the positioning block 2 is arranged on the first part 6 through the second part 7, and the second part 7 extends to one side of the first part 6. The positioning block 2 and the second part 7 are of an integrated structure, and the second part 7 and the first part 6 are of an integrated structure. The auxiliary measurement plate 3 is arranged on the second part 7. The auxiliary measurement plate 3 can also be arranged on the first part 6. When the second part 7 has a relatively short length, the auxiliary measurement plate 3 can also be arranged on the first part 6.

[0040] Specifically, the auxiliary measurement plate 3 and the second part 7 are of an integrated structure, and the upper end of the auxiliary measurement plate 3 is further provided with a convex part 8 for facilitating measurement, and the convex part 8 protrudes the auxiliary measurement plate 3 in the direction close to the positioning block 2.

[0041] The auxiliary measurement plate 3 can also be arranged on the first part 6. When the second part 7 has a relatively short length, the auxiliary measurement plate 3 can also be arranged on the first part 6.

[0042] Specifically, the thickness of the positioning block 2 is greater than the thickness of the main plate 1, and the bottom surface of the positioning block 2 is flush with the bottom surface of the main plate 1. The lowest position of the positioning groove 4 is higher than the height of the top surface of the main plate 1. The main plate 1 comprises a first part 6 and a second part 7 arranged at one end of the first part 6, the positioning block 2 is arranged on the first part 6 through the second part 7, and the second part 7 extends to one side of the first part 6. The positioning block 2 and the second part 7 are of an integrated structure, and the second part 7 and the first part 6 are of an integrated structure. The auxiliary measurement plate 3 is arranged on the second part 7. The auxiliary measurement plate 3 can also be arranged on the first part 6. When the second part 7 has a relatively short length, the auxiliary measurement plate 3 can also be arranged on the first part 6.

[0043] Specifically, the thickness of the positioning block 2 is greater than the thickness of the main plate 1, and the bottom surface of the positioning block 2 is flush with the bottom surface of the main plate 1. The lowest position of the positioning groove 4 is higher than the height of the top surface of the main plate 1. The main plate 1 comprises a first part 6 and a second part 7 arranged at one end of the first part 6, the positioning block 2 is arranged on the first part 6 through the second part 7, and the second part 7 extends to one side of the first part 6. The positioning block 2 and the second part 7 are of an integrated structure, and the second part 7 and the first part 6 are of an integrated structure. The auxiliary measurement plate 3 is arranged on the second part 7. The auxiliary measurement plate 3 can also be arranged on the first part 6. When the second part 7 has a relatively short length, the auxiliary measurement plate 3 can also be arranged on the first part 6.

[0044] The working principle of the embodiment is as follows:

[0045] The surgeon first assesses the shape and size of the medial femoral condyle based on the patient's knee X-ray or CT scan results, and selects the appropriate measuring device. Place the main plate 1 of the measuring device smoothly on the operating table, and make sure that the positioning block 2 and the auxiliary measuring plate 3 are in the correct position.

[0046] The surgeon exposes the patient's knee joint and aligns the medial femoral condyle with the positioning groove 4 on the positioning block 2. Since the bottom wall of the positioning groove 4 is arc-shaped and forms a surface contact with the medial femoral condyle, it can ensure close fitting of the measuring device with the medial femoral condyle and reduce measurement errors. The surgeon observes the centerline auxiliary line 5 in the positioning groove 4, which indicates the centerline position of the medial femoral condyle. In combination with the shape of the auxiliary measuring plate 3 and the positioning groove 4, the surgeon can accurately determine the centerline of the medial femoral condyle and perform prosthesis implantation or other surgical operations accordingly. During the measurement process, the surgeon may need to fine-tune the measuring device according to the actual situation to ensure the accuracy of the measurement. Once the centerline position is determined, the surgeon can proceed with subsequent surgical operations such as prosthesis implantation, osteotomy, etc.

[0047] The utility model is not limited to the above-mentioned optional implementation, and the schemes can be combined arbitrarily under the premise of not contradicting each other; anyone can derive other various forms of products under the inspiration of the utility model, but regardless of any changes in shape or structure, any technical solution falling within the scope defined by the claims of the utility model falls within the protection scope of the utility model.

Claims

1. A midline measuring device for medial unicompartmental knee arthroplasty prosthesis, characterized in that: It includes a motherboard and a positioning block disposed at one end of the motherboard. An auxiliary measuring board is also disposed on the motherboard at one end near the positioning block. The positioning block is provided with a positioning groove, the bottom wall of the positioning groove is arc-shaped, and the bottom wall of the positioning groove is in surface contact with the single malleolus to be measured. The auxiliary measuring plate is positioned on the main board at the center of the positioning groove, and a centerline auxiliary line is provided in the positioning groove.

2. The midline measuring device for a medial unicompartmental knee arthroplasty prosthesis according to claim 1, characterized in that: The thickness of the positioning block is greater than the thickness of the motherboard, and the bottom surface of the positioning block is flush with the bottom surface of the motherboard.

3. The midline measuring device for a medial unicompartmental knee arthroplasty prosthesis according to claim 2, characterized in that: The lowest point of the positioning groove is higher than the top surface of the motherboard.

4. The midline measuring device for a medial unicompartmental knee arthroplasty prosthesis according to claim 3, characterized in that: The motherboard includes a first part and a second part disposed at one end of the first part. The positioning block is disposed on the first part through the second part, and the second part extends to one side of the first part.

5. The midline measuring device for a medial unicompartmental knee arthroplasty prosthesis according to claim 4, characterized in that: The positioning block and the second part are an integral structure, and the second part and the first part are an integral structure.

6. The midline measuring device for a medial unicompartmental knee arthroplasty prosthesis according to claim 5, characterized in that: The auxiliary measuring plate is disposed on the second part.

7. A midline measuring device for medial unicompartmental knee arthroplasty prosthesis according to claim 6, characterized in that: The auxiliary measuring plate and the second part are an integral structure. The upper end of the auxiliary measuring plate is also provided with a protrusion to facilitate measurement. The protrusion protrudes from the auxiliary measuring plate in the direction close to the positioning block.

8. A midline measuring device for medial unicompartmental knee arthroplasty prosthesis according to claim 6, characterized in that: The auxiliary measuring plate is mounted on the second part via a connecting assembly. The second part is provided with a vertical plate. The lower end of the auxiliary measuring plate is rotatably connected to the auxiliary measuring plate via a rotating shaft. A positioning sleeve for positioning the auxiliary measuring plate is sleeved on the vertical plate. The auxiliary measuring plate includes a storage state and a working state. When the auxiliary measuring plate is in the working state, a part of the auxiliary measuring plate and a part of the vertical plate are located inside the positioning sleeve. When the auxiliary measuring plate is in the storage state, the auxiliary measuring plate is disengaged from the positioning sleeve.

9. A midline measuring device for a medial unicompartmental knee arthroplasty prosthesis according to claim 8, characterized in that: A spring is provided between the second part and the positioning sleeve to push the positioning sleeve. One end of the spring is fixed to the second part, and the other end of the spring is in contact with the positioning sleeve. The spring is sleeved on the upright plate.

10. A midline measuring device for medial unicompartmental knee arthroplasty prosthesis according to claim 1, characterized in that: The centerline auxiliary line is recessed into the bottom wall of the positioning groove, and the centerline auxiliary line is also coated with a paint layer to facilitate observation of the centerline auxiliary line.

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