Push plate for knee joint soft tissue balance measuring device and balance measuring device

Abstract

The utility model relates to a push plate for a knee joint soft tissue balance measuring device and the balance measuring device, the push plate comprises an upper push plate and a lower push plate which can move relatively, the upper push plate comprises two upper cantilever sections, the two upper cantilever sections are arranged in parallel and at intervals to form an accommodating cavity, and the lower push plate comprises a lower cantilever section; in the relative movement process of the upper push plate and the lower push plate, when the lower cantilever section is completely embedded into the accommodating cavity, the push plate is in a closed state; when the lower cantilever section is separated from the interior of the containing cavity, the push plate is in a tension applying state, and the technical problems that in the prior art, due to the thickness of an upper push plate and a lower push plate, the upper push plate and the lower push plate need to be inserted between condyles after osteotomy, and therefore operation difficulty and operation time are increased are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to knee joint soft tissue balance measurement technical field, concretely relates to a kind of push plate and balance measuring device for knee joint soft tissue balance measuring device. BACKGROUND

[0002] Knee replacement surgery, also known as total knee arthroplasty, is a common and effective surgical procedure used to treat severe knee joint diseases and injuries, such as severe osteoarthritis, traumatic joint destruction or flexion deformity. The surgery aims to reduce or eliminate pain, restore knee joint function and improve the quality of life of patients.

[0003] In knee replacement surgery, damaged knee joint tissues will be replaced by artificial joint components. These artificial joint components are usually made of metal, plastic or ceramic materials, aiming to simulate the function and structure of natural joints. During the surgery, the surgeon will remove the damaged bones and soft tissues through bone cutting and tissue repair steps, and then implant appropriate artificial joint components into the knee joint.

[0004] In knee replacement surgery, ensuring the stability and function of artificial joints is crucial. Soft tissue balance plays a key role in the surgery, which involves adjusting the gap between femoral condyles and prostheses to ensure normal movement and stability of the knee joint. This process requires accurate assessment of the tension distribution of medial and lateral ligaments in the knee joint, as well as coordination of flexion gap (distance between prostheses when knee is bent) and extension gap (distance when knee is fully extended). Traditional methods rely on the experience of the surgeon to manually pull the ligaments with a traction device, combined with visual judgment using gap measuring blocks, which has strong subjectivity and lacks quantitative standards.

[0005] With the development of digital surgery technology, quantitative evaluation of gap balance has gradually received attention. Surgeons need to measure the gap distance between the distal femur and the proximal tibia in two body positions: 90° flexion and full extension. During this process, the tension applying device applies tension to the joint capsule and surrounding ligaments by simulating physiological load (usually set at 80-100N axial traction), so that the originally relaxed soft tissues recover to a physiological tension state. At this time, by measuring the pressure distribution of the push plate and the femoral condyle contact surface, the soft tissue balance state can be indirectly reflected. Ideally, the medial and lateral gaps should remain symmetrical in flexion and extension positions, with a difference of less than 1-2mm, which is crucial for long-term stability of the prosthesis and postoperative biomechanical properties of the knee joint. The currently used balance measuring devices, whether active or passive, measure through the planar push plate in contact with the femoral condyle. However, due to the structural rigidity of the upper and lower push plates, they cannot be too thin, and the combined thickness usually exceeds 4mm, so the tibial plateau needs to be cut off during the operation to insert between the condyles, increasing the operation difficulty and time. Utility model content

[0006] In view of various deficiencies of the prior art, the knee joint soft tissue balance measuring device push plate and balance measuring device are provided to solve the technical problem that the upper push plate and the lower push plate need to be inserted into the intercondylar first due to their thickness, thus increasing the difficulty of operation and the operation time.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] In the first aspect, the utility model provides a kind of push plate for knee joint soft tissue balance measuring device, including relatively movable upper push plate and lower push plate, the upper push plate includes 2 upper cantilever sections, 2 upper cantilever sections are parallel and interval arrangement, to form accommodating cavity, the lower push plate includes lower cantilever section;

[0009] In the process of the relative movement of the upper push plate and the lower push plate, when the lower cantilever section is fully embedded inside the accommodating cavity, the push plate is in closed state;When the lower cantilever section is separated from the inside of the accommodating cavity, the push plate is in tension state.

[0010] The technical scheme is further provided, and the first end of the two upper cantilever sections is connected with the upper transition section respectively, the second end of the two upper cantilever sections is separated to form fork structure, and the thickness of the upper cantilever section is less than the thickness of the upper transition section.

[0011] The technical scheme is further provided, and the second end outside corner of the upper cantilever section is provided as arc corner, and the outside corner is the corner of the upper cantilever section away from another upper cantilever section.

[0012] The technical scheme is further provided, and the upper push plate further includes upper mounting section, the upper transition section is connected with the upper mounting section and the upper cantilever section respectively, and the upper mounting section is provided with upper mounting hole and upper positioning hole.

[0013] Along the direction from the upper mounting section to the upper cantilever section, the thickness of the upper transition section gradually decreases.

[0014] The technical scheme is further provided, and the width of the lower cantilever section is not more than the width of the accommodating cavity, and the thickness of the lower cantilever section is not more than the thickness of the upper cantilever section.

[0015] The technical scheme is further provided, and the first end of the lower cantilever section is connected with the lower transition section, the thickness of the lower cantilever section is less than the thickness of the lower transition section, and the lower transition section is provided with weight-reducing hole.

[0016] The technical scheme is further provided, and the lower surface of the upper transition section is provided with accommodating groove.

[0017] When the push plate is in the closed state, the lower transition section is embedded inside the accommodating groove.

[0018] The push plate further comprises a lower mounting section, the lower transition section is connected with the lower mounting section and the lower cantilever section respectively, and the lower mounting section is provided with a lower mounting hole and a lower positioning hole.

[0019] The thickness of the lower transition section gradually decreases along the direction from the lower mounting section to the lower cantilever section.

[0020] In the second aspect, the utility model provides a balance measuring device, including push plate and drive element, drive element's output end with upper push plate transmission connection, to drive upper push plate relative to lower push plate moves.

[0021] The push plate further comprises a lower mounting section, the lower transition section is connected with the lower mounting section and the lower cantilever section respectively, and the lower mounting section is provided with a lower mounting hole and a lower positioning hole.

[0022] The push plate further comprises a lower mounting section, the lower transition section is connected with the lower mounting section and the lower cantilever section respectively, and the lower mounting section is provided with a lower mounting hole and a lower positioning hole.

[0023] By setting the parallel and interval 2 upper cantilever sections to form the accommodating cavity, when the push plate is in the closed state, the lower cantilever section is embedded inside the accommodating cavity, the thickness of the front part of the push plate is effectively reduced, unnecessary osteotomy is not needed in the actual operation, the intercondylar can be directly inserted, the operation time is shortened, and the pressure and risk of the doctor and the patient are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the schematic diagram of the push plate for the knee joint soft tissue balance measuring device in the embodiment of the utility model;

[0025] Figure 2 It is the top view of the push plate for the knee joint soft tissue balance measuring device in the embodiment of the utility model;

[0026] Figure 3 It is Figure 2 A-A sectional view in the embodiment of the utility model;

[0027] Figure 4 It is the schematic diagram of the push plate for the knee joint soft tissue balance measuring device in the embodiment of the utility model;

[0028] Figure 5 It is the schematic diagram of the push plate for the knee joint soft tissue balance measuring device in the embodiment of the utility model;

[0029] Figure 6 It is the schematic diagram of the push plate for the knee joint soft tissue balance measuring device in the embodiment of the utility model;

[0030] Figure 7is a schematic view of the lower push plate in the embodiment of the utility model;

[0031] Figure 8 is a schematic view of the balance measuring device in the embodiment of the utility model.

[0032] In the drawing: 100, upper push plate;101, upper cantilever section;1011, outer corner;102, upper transition section;1021, accommodating groove;103, upper mounting section;1031, upper mounting hole;1032, upper positioning hole;104, accommodating cavity;200, lower push plate;201, lower cantileve section;2011, edge corner;202, lower transition section;2021, weight-reducing hole;203, lower mounting section;2031, lower mounting hole;2032, lower positioning hole;2033, let-position gap;300, shell;400, corrugated sealing tube. DETAILED DESCRIPTION

[0033] In order to make the personnel in the art better understand the technical scheme of the utility model, the technical scheme of the utility model is described clearly and completely below in combination with the drawings of the utility model, based on the embodiment in the application, other similar embodiments obtained by the person skilled in the art without making creative labor should all belong to the protection scope of the application.In addition, the direction words mentioned in the following embodiments, for example, "up", "down", "left", "right" and the like are only the direction of the drawing, therefore, the direction words used are used to explain but not limit the present application.

[0034] The utility model is further described below in combination with the drawings and preferred embodiments.

[0035] According to the utility model embodiment, a kind of knee joint soft tissue balance measuring device push plate is provided, please refer to Figures 1 to 7 Including relatively movable upper push plate 100 and lower push plate 200, the upper push plate 100 includes 2 upper cantilever sections 101, 2 upper cantilever sections 101 are parallel and interval arrangement, to form accommodating cavity 104, the lower push plate 200 includes lower cantilever section 201;

[0036] In the relative movement of the upper push plate 100 and the lower push plate 200, when the lower cantilever section 201 is all embedded inside the accommodating cavity 104, push plate is in closed state;When the lower cantilever section 201 is separated from the inside of the accommodating cavity 104, push plate is in tension state.

[0037] Further, the structure of 2 upper cantilever sections 101 is same, and the two are parallel and interval arrangement in the same horizontal plane, and the accommodating cavity 104 is formed between the two, and the lower cantilever section 201 is correspondingly arranged in the accommodating cavity 104.

[0038] It should be noted that when the push plate is in the closed state, the lower cantilever section 201 can be fully embedded inside the accommodating cavity 104, at this time, the upper cantilever section 101 and the lower cantilever section 201 are completely coincident in the thickness direction, effectively reducing the front thickness of the push plate. In actual surgery, unnecessary osteotomy does not need to be done, and it can be directly inserted into the intercondylar, shortening the operation time, reducing the pressure and risk of doctors and patients; when the lower cantilever section 201 is separated from the inside of the accommodating cavity 104, the push plate is in a tension state, at this time, the distance between the upper push plate 100 and the lower push plate 200 is the gap value between the femur and the tibia in different extension and flexion states. This gap value helps to develop a more suitable surgical plan for patients to achieve good soft tissue balance.

[0039] In the push plate for the knee joint soft tissue balance measuring device of the embodiment, please refer to Figures 1 to 7 The first end of the two upper cantilever sections 101 is connected with the upper transition section 102, respectively, and the second end of the two upper cantilever sections 101 is separated from each other to form a fork structure, providing space for the lower cantilever section 201, and the thickness of the upper cantilever section 101 is less than the thickness of the upper transition section 102.

[0040] Further, the first end of the two upper cantilever sections 101 is connected by the upper transition section 102, and the two upper cantilever sections 101 can be driven to move synchronously by a single driving element, which can ensure that the two upper cantilever sections 101 move at the same speed, thereby improving the accuracy and consistency of the operation.

[0041] It should be noted that during the operation, the two upper cantilever sections 101 respectively abut the lateral femoral condyle and the medial femoral condyle. In order to further enhance the strength of the upper push plate 100 and reduce deformation, the thickness of the upper push plate 100 gradually increases along the direction from the upper cantilever section 101 to the upper transition section 102.

[0042] In the push plate for the knee joint soft tissue balance measuring device of the embodiment, please refer to Figures 1 to 6 In order to reduce the influence of sharp corners on surgical operation and the damage to human tissues, the second end outside corner 1011 of the upper cantilever section 101 is provided as an arc-shaped corner, and the outside corner 1011 is the corner of the upper cantilever section 101 away from the other upper cantilever section 101.

[0043] Further, the second end of each upper cantilever section 101 has one inner corner and one outer corner 1011, the inner corner is located at the opposite side of the two upper cantilever sections 101, and the outer corner 1011 is located at the side away from the two upper cantilever sections 101. Since the push plate is inserted into the intercondylar in a closed state, the inner corner does not directly contact the human tissue, so the inner corner can or can not adopt an arc-shaped corner, while the outer corner 1011 directly contacts the human tissue, so the outer corner 1011 adopts an arc-shaped corner to reduce its impact on the surgical operation and damage to the human tissue.

[0044] In the push plate for the knee joint soft tissue balance measuring device of the embodiment, as shown in Figures 1 to 6 , the upper push plate 100 further comprises an upper mounting section 103, the upper transition section 102 is connected with the upper mounting section 103 and the upper cantilever section 101 respectively, and the upper mounting section 103 is provided with an upper mounting hole 1031 and an upper positioning hole 1032.

[0045] Further, the two sides of the upper mounting hole 1031 are provided with the upper positioning hole 1032, and the upper mounting hole 1031 and the two upper positioning holes 1032 are located on the same straight line, which is parallel to the length direction of the upper push plate 100.

[0046] Further, a screw is arranged in the upper mounting hole 1031, and a positioning pin is arranged in the upper positioning hole 1032, and the installation mode of single screw and double positioning pins can solve the consistency and stability of repeated positioning and repeated disassembly and assembly.

[0047] In the push plate for the knee joint soft tissue balance measuring device of the embodiment, as shown in Figures 1 to 6 , along the direction from the upper mounting section 103 to the upper cantilever section 101, the width of the upper transition section 102 gradually increases, and the thickness of the upper transition section 102 gradually decreases.

[0048] Further, the cross section of the upper mounting section 103 adopts a circular shape, and the diameter is greater than the width of the part of the upper transition section 102 connected therewith, that is, the upper push plate 100 is provided with a structure of wide front and rear end and narrow middle part, for reducing the interference with the human tissue during the operation.

[0049] Further, the thickness of the upper mounting section 103 is equal to the thickness of the part of the upper transition section 102 connected therewith, that is, the upper push plate 100 is provided with a structure of thin front end and thick rear end, which can increase the structural rigidity and reduce the deformation. The part of the upper push plate 100 with changing thickness can adopt an arc-shaped surface transition. Preferably, the lower surface of the upper push plate 100 can be provided with a plane, and the thickness change is realized by the height change of the upper surface of the upper push plate 100, specifically, the height change of the upper surface of the upper transition section 102.

[0050] In the knee joint soft tissue balance measuring device push plate of the embodiment, please refer to Figures 1 to 7 In order to ensure that the lower cantilever section 201 is smoothly embedded in the receiving cavity 104, the width of the lower cantilever section 201 is not greater than the width of the receiving cavity 104, and the thickness of the lower cantilever section 201 is not greater than the thickness of the upper cantilever section 101.

[0051] Further, the thickness of the lower cantilever section 201 is the same as the thickness of the upper cantilever section 101, that is, when the push plate is in the closed state, the upper surface of the lower cantilever section 201 is flush with the upper surface of the upper cantilever section 101, and at the same time, the lower surface of the lower cantilever section 201 is flush with the lower surface of the upper cantilever section 101.

[0052] Further, when the upper push plate 100 moves relative to the lower push plate 200, causing the lower cantilever section 201 to separate from the receiving cavity 104, the lower cantilever section 201 will directly contact the human tissue. In order to reduce the influence on the operation and the harm to the human tissue, the edge corners 2011 of the lower cantilever section 201 are arc corners.

[0053] In the knee joint soft tissue balance measuring device push plate of the embodiment, please refer to Figures 1 to 7 The first end of the lower cantilever section 201 is connected with the lower transition section 202. In order to further enhance the strength of the lower push plate 200 and reduce deformation, the thickness of the lower cantilever section 201 is less than the thickness of the lower transition section 202. At the same time, in order to avoid interference with the upper push plate 100, the width of the lower cantilever section 201 is greater than the width of the lower transition section 202.

[0054] In the knee joint soft tissue balance measuring device push plate of the embodiment, please refer to Figures 1 to 7 The lower transition section 202 is provided with a weight-reducing hole 2021. The weight-reducing hole 2021 can reduce the loss of rigidity and strength while reducing the weight.

[0055] Further, the shape, arrangement and number of the weight-reducing hole 2021 can be increased or decreased according to actual conditions. In the embodiment, the weight-reducing hole 2021 is a circular weight-reducing hole, and there are three circular weight-reducing holes, which are arranged along the length direction of the lower push plate 200.

[0056] In the knee joint soft tissue balance measuring device push plate of the embodiment, please refer to Figures 1 to 7 The lower surface of the upper transition section 102 is provided with a receiving groove 1021, which is in communication with the receiving cavity 104. Since the width of the lower transition section 202 is less than the width of the lower cantilever section 201, correspondingly, the width of the receiving groove 1021 is less than the width of the receiving cavity 104.

[0057] When the push plate is in the closed state, the lower cantilever section 201 is fully embedded in the accommodating cavity 104, and since the thickness of the lower transition section 202 is greater than the thickness of the lower cantilever section 201, the lower transition section 202 is partially embedded in the accommodating groove 1021.

[0058] In the push plate for the knee joint soft tissue balance measuring device, Figures 1 to 7 The lower push plate 200 further comprises a lower mounting section 203, the lower transition section 202 is connected with the lower mounting section 203 and the lower cantilever section 201 respectively, and the lower mounting section 203 is provided with a lower mounting hole 2031 and a lower positioning hole 2032.

[0059] Further, the lower mounting hole 2031 is located at the end of the lower mounting section 203, the middle and the other end of the lower mounting section 203 are provided with the lower positioning hole 2032, the lower mounting hole 2031 and the two lower positioning holes 2032 are located on the same straight line, and the straight line is parallel to the width direction of the lower push plate 200.

[0060] Further, a screw is arranged in the lower mounting hole 2031, and a positioning pin is arranged in the lower positioning hole 2032, and the installation mode of the single screw and the double positioning pins can solve the consistency and stability of repeated positioning and repeated disassembly and assembly.

[0061] In the push plate for the knee joint soft tissue balance measuring device, Figures 1 to 7 Further, the thickness of the lower transition section 202 gradually decreases along the direction from the lower mounting section 203 to the lower cantilever section 201.

[0062] Further, the lower mounting section 203 and the lower cantilever section 201 are both provided in a straight plate shape, the width of the lower mounting section 203 is greater than the width of the part of the lower transition section 202 connected with the lower mounting section 203, that is, the lower push plate 200 is also provided in a structure that the front end and the rear end are wide and the middle part is narrow, so as to reduce the interference with human tissues in surgery.

[0063] Further, the thickness of the lower mounting section 203 is less than the thickness of the part of the lower transition section 202 connected with the lower mounting section 203, that is, the lower push plate 200 is provided in a structure that the front end and the rear end are thin and the middle part is thick, so as to increase the structural rigidity and reduce the deformation. The thickness change part of the lower transition section 202 can adopt an arc surface transition. Preferably, the thickness change of the lower transition section 202 is realized through the height change of the upper surface and the lower surface of the lower transition section 202, wherein the arc surface of the joint between the upper surface of the lower transition section 202 and the lower cantilever section 201 matches the arc surface of the joint between the upper surface of the upper transition section 102 and the upper cantilever section 101, and the radii of the two arc surfaces can be the same.

[0064] According to the embodiment of the utility model, a balance measuring device is provided, please refer to Figures 1 to 8The device includes the push plate and the drive element. The output end of the drive element is fitted with a corrugated sealing tube 400 to prevent blood or disinfectant from the knee joint from entering the balance measuring device. At the same time, the output end of the drive element is connected to the upper push plate 100 to drive the upper push plate 100 to move relative to the lower push plate 200.

[0065] Furthermore, the upper mounting hole 1031 is connected to the output end of the drive element by a screw, and a positioning pin is provided between the upper positioning hole 1032 and the output end of the drive element.

[0066] It should be noted that during the movement of the upper push plate 100 relative to the lower push plate 200 driven by the driving element, the distance between the upper push plate 100 and the lower push plate 200 is the gap value between the femur and tibia under different extension and flexion states. This gap value helps to formulate a surgical plan that is more suitable for the patient, so as to achieve good soft tissue balance, reduce unnecessary osteotomy, and shorten the operation time.

[0067] In the balance measuring device of this embodiment, please refer to Figures 1 to 8 It also includes a housing 300, and the push plate 200 is connected to the housing 300 through a lower mounting section 203. The lower mounting section 203 is provided with a clearance notch 2033 to avoid the output end of the drive element.

[0068] Furthermore, a fixing plate is provided on the outside of the housing 300, and the lower mounting hole 2031 is connected to the fixing plate by screws. At the same time, a positioning pin is provided between the lower positioning hole 2032 and the fixing plate.

[0069] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A push plate for a knee joint soft tissue balance measuring device, comprising an upper push plate and a lower push plate that are movable relative to each other, characterized in that, The upper push plate includes two upper cantilever sections, which are parallel and spaced apart to form a receiving cavity; the lower push plate includes a lower cantilever section. During the relative movement of the upper push plate and the lower push plate, when the lower cantilever section is fully embedded inside the receiving cavity, the push plate is in a closed state; when the lower cantilever section is disengaged from the receiving cavity, the push plate is in a state of applied tension.

2. The push plate for the knee joint soft tissue balance measuring device according to claim 1, characterized in that, The first ends of the two upper cantilever sections are respectively connected to the upper transition section, and the second ends of the two upper cantilever sections are separated to form a fork-shaped structure. The thickness of the upper cantilever section is less than the thickness of the upper transition section.

3. The push plate for the knee joint soft tissue balance measuring device according to claim 2, characterized in that, The outer corner of the second end of the upper cantilever segment is set as an arc corner, and the outer corner is the corner of the upper cantilever segment away from another upper cantilever segment.

4. The push plate for the knee joint soft tissue balance measuring device according to claim 2, characterized in that, The upper push plate also includes an upper mounting section, and the upper transition section is connected to the upper mounting section and the upper cantilever section respectively. The upper mounting section is provided with an upper mounting hole and an upper positioning hole. Along the direction from the upper mounting section to the upper cantilever section, the thickness of the upper transition section gradually decreases.

5. The push plate for the knee joint soft tissue balance measuring device according to claim 1, characterized in that, The width of the lower cantilever section is not greater than the width of the receiving cavity, and the thickness of the lower cantilever section is not greater than the thickness of the upper cantilever section.

6. The push plate for the knee joint soft tissue balance measuring device according to any one of claims 2-4, characterized in that, The first end of the lower cantilever section is connected to the lower transition section. The thickness of the lower cantilever section is less than the thickness of the lower transition section. The lower transition section is provided with weight reduction holes.

7. The push plate for the knee joint soft tissue balance measuring device according to claim 6, characterized in that, The lower surface of the upper transition section is provided with a receiving groove; When the push plate is in the closed state, the lower transition section is embedded inside the receiving groove.

8. The push plate for the knee joint soft tissue balance measuring device according to claim 6, characterized in that, The push plate also includes a lower mounting section, and the lower transition section is connected to the lower mounting section and the lower cantilever section respectively. The lower mounting section is provided with a lower mounting hole and a lower positioning hole. Along the direction from the lower mounting section to the lower cantilever section, the thickness of the lower transition section gradually decreases.

9. A balance measuring device, characterized in that, The device includes a push plate as described in any one of claims 1-8 and a driving element, wherein the output end of the driving element is connected to the upper push plate in a driving manner to drive the upper push plate to move relative to the lower push plate.

10. The balance measuring device according to claim 9, characterized in that, It also includes a housing, and the push plate is connected to the housing via a lower mounting section, the lower mounting section being provided with a clearance notch to avoid the output end of the drive element.

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