A full-length locking plate for the medial side of the tibia

Abstract

This utility model discloses a full-length locking plate for the medial aspect of the tibia, solving the technical problem that existing locking plates cannot adequately meet user needs. The device includes a locking plate body with an arc-shaped cross-section. One surface of the locking plate body is adapted to the shape of the medial aspect of the tibia. The locking plate body is an integral structure composed of a proximal head, a body, and a distal head. The proximal head is connected to the first end of the body, and the distal head is connected to the second end of the body. Multiple universal holes are provided on both the proximal and distal heads. By setting one side of the locking plate body to conform to the shape of the medial aspect of the tibia, this application allows the locking plate body to fit snugly against the medial aspect of the tibia. Furthermore, when the locking plate body is fixed through the multiple universal holes on the proximal and distal heads, the installation direction of the bone screws can be determined according to the fracture condition, ensuring even force distribution on the locking plate body and improving user comfort.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a full-length locking plate for the medial side of the tibia. Background Technology

[0002] The tibia is located inside the lower leg. A severe impact to the lower leg or osteoporosis in the elderly can easily cause a tibial fracture or comminuted fracture. Tibial fractures are a common occurrence in trauma orthopedics, accounting for 23.0% of all fractures. During tibial surgical repair, a metal locking plate is implanted, spanning the fracture site. Bone screws are used to fix the locking plate to both ends of the fracture, effectively stabilizing the bone at the fracture ends and thus achieving tibial fixation.

[0003] Most existing locking plates are imitations of foreign products, and their geometry does not conform to the anatomical and physiological characteristics of fractures in Chinese patients. The fit between the locking plate and the human bone surface is not ideal, and the locking holes on the plate are usually designed according to a predetermined direction. When fixing the locking plate to the tibia, the bone screw can only be installed along the axis of the locking hole. However, in tibial surgical repair, the fracture location is unpredictable, and the fracture conditions are complex and diverse. Using the aforementioned locking plates for tibial surgical repair has certain limitations. The locking plate cannot be well fixed to the tibia, easily causing uneven stress on the plate, leading to breakage or loosening, thus increasing postoperative discomfort for the patient and affecting the surgical outcome.

[0004] In the process of developing this utility model, the applicant discovered at least the following problems in the prior art:

[0005] The existing locking plate cannot adequately meet the user's needs and may affect the effectiveness of tibial repair. Utility Model Content

[0006] The purpose of this invention is to provide a full-length locking plate for the medial side of the tibia, thereby solving the technical problem that existing locking plates in the prior art cannot adequately meet user needs and can easily affect the effectiveness of tibial repair. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This utility model provides a full-length locking plate for the medial side of the tibia, including a locking plate body. The cross-section of the locking plate body is an arc-shaped structure, and one surface of the locking plate body is adapted to the shape of the medial side of the tibia. The locking plate body is an integral structure composed of a proximal head, a body, and a distal head. The proximal head is connected to a first end of the body, and the distal head is connected to a second end of the body. Both the proximal head and the distal head are provided with multiple universal holes.

[0009] Optionally, the proximal head and the body have a first torsion angle, the first torsion angle being the angle between the surface of the proximal head extending to the body and the surface of the body.

[0010] Optionally, the distal head and the body have a second torsion angle, the second torsion angle being the angle between the surface of the distal head extending to the body and the surface of the body.

[0011] Optionally, the proximal head is adapted to the upper end of the tibia, the body is adapted to the shaft of the tibia, and the distal head is adapted to the lower end of the tibia.

[0012] Optionally, the width of the proximal head is greater than the width of the body and the width of the distal head; the two sides of the connection between the proximal head and the body are concave arc-shaped.

[0013] Optionally, the body is provided with a plurality of mounting holes, which are evenly arranged along the length of the body, and the mounting holes are gourd-shaped.

[0014] Optionally, the locking plate body is made of titanium alloy.

[0015] Optionally, the locking plate body has a cuttable structure.

[0016] Optionally, the locking plate body can be a large locking plate for men, a medium locking plate for men, a small locking plate for men, a large locking plate for women, a medium locking plate for women, or a small locking plate for women.

[0017] Optionally, the edge of the locking plate body is a smooth arc surface structure; both the proximal head and the distal head have arc-shaped ends.

[0018] Implementing one of the above-described technical solutions of this utility model has the following advantages or beneficial effects:

[0019] This invention features a locking plate body with one side designed to fit the shape of the medial tibial surface, allowing the locking plate body to fit snugly against the medial tibial surface. When the locking plate body is fixed by multiple universal holes on the proximal and distal heads, the installation direction of the bone screws can be determined according to the fracture condition, ensuring even force distribution on the locking plate body and improving user comfort. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0021] Figure 1 This is a front view of an embodiment of the present utility model;

[0022] Figure 2 This is a side view of an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram illustrating the measurement of the full length of the tibia according to an embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of the cross-sectional measurement of the anteroposterior diameter of the tibial plateau according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram illustrating the measurement of the maximum transverse diameter of the tibial plateau according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of measuring the inner curvature 1 according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of measuring the inner curvature 2 according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of measuring the medial side of the proximal tibia ∠1 and the medial side of the proximal tibia ∠2 according to an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram illustrating the measurement of the tibial tuberosity angle according to an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of measuring medial malleolus ∠1 and medial malleolus ∠2 according to an embodiment of the present invention.

[0031] In the diagram: 1. Proximal head; 2. Body; 3. Distal head; 4. Universal through hole; 5. Mounting hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, various exemplary embodiments described below will be referenced to the accompanying drawings, which form part of the exemplary embodiments, illustrating various exemplary embodiments that may be adopted to implement this utility model. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. It should be understood that they are merely examples of processes, methods, and apparatuses consistent with some aspects of this utility model disclosed as detailed in the appended claims, and other embodiments may be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and spirit of this utility model.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the referred element must have a specific orientation, or be constructed and operated in a specific orientation. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. The term "multiple" means two or more. The terms "connected" and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, communication connections, direct connections, indirect connections through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more of the related listed items. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] To illustrate the technical solution described in this utility model, specific embodiments are described below, showing only the parts related to the embodiments of this utility model.

[0035] Example 1:

[0036] like Figure 1As shown, this utility model provides a full-length locking plate for the medial side of the tibia, including a locking plate body with an arc-shaped cross-section. One surface of the locking plate body is adapted to the shape of the medial surface of the tibia. The locking plate body is an integral structure composed of a proximal head 1, a body 2, and a distal head 3. The proximal head 1 is connected to the first end of the body 2, and the distal head 3 is connected to the second end of the body 2. Both the proximal head 1 and the distal head 3 are provided with multiple universal holes 4. Specifically, the cross-section of the locking plate body is arc-shaped, and the curvature of the arc-shaped structure is adapted to the curvature of the medial surface of the tibia, so that the locking plate body can fit well on the tibia. The integral molding of the locking plate body can ensure the stability of the structure and facilitate processing and production. Both the proximal head 1 and the distal head 3 are provided with multiple universal holes 4. Through the interaction of the universal holes 4 and bone screws, the proximal head 1 can be nailed to the upper end of the tibia, and the distal head 3 can be nailed to the lower end of the tibia. When installing the locking plate body, the universal joint 4 utilizes a locking technology that allows the surgeon to adjust the screw placement angle based on the patient's tibial anatomy and fracture details, optimizing the fixation of specific fracture fragments. After placing the locking plate body, the screw placement direction can also be adjusted, resulting in more accurate screw placement and preventing the screw from penetrating the articular surface. The multiple universal joints 4 on the proximal head 1 can be arranged in two perpendicular rows to ensure that the wider sides of the proximal head 1 and its vertical direction (i.e., the length of the locking plate body) are well fixed to the upper end of the tibia, ensuring a tight fit between the proximal head 1 and the upper end of the tibia. The multiple universal joints 4 on the distal head 3 can be arranged in two parallel rows.

[0037] This invention sets one side of the locking plate body to fit the shape of the inner side of the tibia, so that the locking plate body can fit well on the inner side of the tibia. When the locking plate body is fixed by multiple universal holes 4 on the proximal head 1 and the distal head 3, the installation direction of the bone screw can be determined according to the fracture condition, so that the locking plate body is evenly stressed and the user's comfort is improved.

[0038] As an optional implementation, a first torsion angle is provided between the proximal head 1 and the body 2. The first torsion angle is the angle between the surface of the proximal head 1 extending to the body 2 and the surface of the body 2. Specifically, the first torsion angle between the proximal head 1 and the body 2 is used to adapt to the proximal medial angle of the tibia, so that the locking plate body can fit tightly against the upper end of the medial side of the tibia, improving the locking effect of the locking plate body on the tibia and the comfort of use, thereby meeting the user's needs.

[0039] As an optional implementation, a second torsion angle is provided between the distal head 3 and the body 2. The second torsion angle is the angle between the surface of the distal head 3 extending to the body 2 and the surface of the body 2. Specifically, the second torsion angle between the distal head 3 and the body 2 is used to adapt to the medial malleolus angle on the tibia, so that the locking plate body can fit tightly against the lower end of the medial side of the tibia, improving the locking effect of the locking plate body on the tibia and the comfort of use, thereby meeting the user's needs.

[0040] As an optional implementation, the proximal head 1 is adapted to the upper end of the tibia, the body 2 is adapted to the shaft of the tibia, and the distal head 3 is adapted to the lower end of the tibia. Specifically, the locking plate body has an anatomical structure designed according to the anatomy of the medial side of the tibia, which can adapt to the medial side of the human tibia. This ensures that when the locking plate body is fixed to the tibia, the proximal head 1 fits tightly to the upper end of the tibia, the body 2 fits tightly to the shaft of the tibia, and the distal head 3 fits tightly to the lower end of the tibia, thereby improving the locking support effect of the locking plate body on the tibia.

[0041] As an optional implementation, the width of the proximal head 1 is greater than the width of the body 2 and the width of the distal head 3, and the two sides of the connection between the proximal head 1 and the body 2 are concave arc-shaped. Specifically, since the upper end of the tibia is enlarged, forming a medial condyle and a lateral condyle, the width of the proximal head 1 is set to be greater than the width of the body 2 and the width of the distal head 3, so that the locking plate body can fit well against the medial side of the tibia, ensuring that the locking plate body is stably fixed to the tibia. The two sides of the connection between the proximal head 1 and the body 2 are concave arc-shaped, so that the proximal connector matches the tubercle angle of the tibia. When the locking plate body is installed on the tibia, the concave arc shape on both sides of the connection between the proximal head 1 and the body 2 can avoid the tubercle (i.e., tibial tuberosity) on the tibia, so that the proximal head 1 of the locking plate body fits tightly against the upper end of the tibia, without being supported by the tubercle on the tibia.

[0042] As an optional implementation, the body 2 is provided with multiple mounting holes 5, which are evenly arranged along the length of the body 2 and are gourd-shaped. Specifically, the gourd-shaped mounting holes 5 on the body 2 facilitate adjustment of the bone screw installation position according to the actual situation of the tibial fracture, so as to securely install the locking plate body on the tibia and have good mechanical properties. The multiple mounting holes 5 are arranged in a row along the length of the body 2, and can be arranged at equal intervals. The number of mounting holes 5 can be adaptively set according to actual needs. The mounting holes 5 can adopt universal locking technology, which allows doctors to adjust the screw placement angle according to the patient's tibial anatomy and tibial fracture, optimize the fixation of specific fracture fragments, and adjust the screw placement direction after the locking plate body is placed, and the screw placement position is more accurate, avoiding bone screw penetration into the joint surface.

[0043] As an optional implementation, the locking plate body is made of titanium alloy. Specifically, the locking plate body is a metal plate made of titanium. Titanium is very lightweight yet extremely tough and corrosion-resistant, and can maintain its original color at room temperature for life. The preferred material for the locking plate body is medical-grade titanium alloy, which has high specific strength, mechanical properties close to human bone, strength far superior to pure titanium, and also features excellent fatigue resistance, corrosion resistance, and biocompatibility. Alternatively, the locking plate body can also be made of polyetheretherketone (PEEK) or medical-grade stainless steel.

[0044] As an optional implementation, the locking plate body has a cuttable structure. Specifically, during tibial surgery repair, the locking plate body can be cut to fit different types of fractures on the medial side of the tibia to achieve full coverage of the tibial fracture, facilitating its application in clinical surgery and meeting the needs of different fracture types.

[0045] As an optional implementation, the locking plate body can be a large locking plate for men, a medium locking plate for men, a small locking plate for men, a large locking plate for women, a medium locking plate for women, or a small locking plate for women. Specifically, the large locking plate for men is suitable for men with a height of 176cm-185cm, the medium locking plate for men with a height of 166cm-175cm, and the small locking plate for men with a height of 155cm-165cm. The large locking plate for women is suitable for women with a height of 166cm-175cm, the medium locking plate for women with a height of 156cm-165cm, and the small locking plate for women with a height of 145cm-155cm. Different sizes of locking plate bodies are suitable for patients of different heights and genders, which can reduce postoperative discomfort after internal fixation surgery. Furthermore, the locking plates used on the patient's left and right legs are mirror-symmetrically designed. During tibial repair surgery, different locking plates must be selected for each leg to ensure a proper fit to the damaged tibia. The dimensions of different locking plate models are adapted to the specific tibia of the target population. For example, the specific data for the locking plate's thickness, length, maximum proximal head width, maximum distal head width, maximum body width, first knob angle, and second knob angle are as follows:

[0046] Table 1

[0047]

[0048] As an optional implementation, the locking plate body has a smooth, curved edge structure, with both the proximal head 1 and the distal head 3 having curved ends. Specifically, the smooth, curved edge structure of the locking plate body reduces friction damage to tendons, ligaments, and soft tissues, as well as the feeling of a foreign body, improving user comfort when using the locking plate body. The curved ends of both the proximal head 1 and the distal head 3 reduce irritation to the wound surface.

[0049] The data for the locking plate support body in this application was obtained by performing CT scans on the tibia and surrounding soft tissues of multiple subjects. The axial slice thickness of each CT image was 1.5 mm. The CT image data were imported into Mimics Medical 21.0 software, where a bone mask was set with a minimum value of 160 and a maximum value of 3000 to distinguish it from other tissues. Then, region growing was performed to differentiate the bilateral tibias from other bone tissues. The bilateral tibial regions were then modeled and saved. The established bilateral tibial models were imported into 3-maticMedical 13.0 (x64) software for separate measurements and recording. The measured data included the axial measurement of the total tibial length, the anteroposterior diameter of the tibial plateau measured in cross-section, the medial curvature measured in the frontal plane, the medial angle of the proximal tibia in lateral view, the tibial tuberosity angle, and the medial malleolus angle. Finally, the data from multiple bilateral tibial models were statistically analyzed to obtain the average values ​​of the axial length of the tibia, the average values ​​of the anteroposterior diameter of the tibial plateau measured in the transverse section, the average values ​​of the medial curvature measured in the frontal plane, the average values ​​of the medial angle of the proximal tibia in the lateral view, the average values ​​of the tibial tuberosity angle, and the average values ​​of the medial malleolar angle 1, providing anatomical data for the locking plate body.

[0050] During the measurement, the number of participants can be selected as 180, including 90 men and 90 women. The selected participants are grouped according to height and gender for measurement, including: Group 1: Women 145cm-155cm; Group 2: Women 156cm-165cm; Group 3: Women 166cm-175cm; Group 4: Men 155cm-165cm; Group 5: Men 166cm-175cm; Group 6: Men 176cm-185cm. Through grouped measurements, anatomical data of different models of locking plates (men's large, medium, and small sizes) and women's large, medium, and small sizes are obtained.

[0051] The anatomical data corresponding to different models of locking plates were obtained by measuring each group using the above method, as follows:

[0052] Table 2

[0053]

[0054] Table 3

[0055]

[0056] More specifically, the participants were selected as healthy adults excluding those with bone tumors, knee osteoarthritis, bone hyperplasia, congenital malformations, or a history of tibial fracture surgery.

[0057] The embodiment is merely a special case and does not indicate that this utility model is implemented in such a way.

[0058] The above description is merely a preferred embodiment of the present utility model. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present utility model. Furthermore, under the teachings of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present utility model.

Claims

1. A full-length locking plate on the medial side of the tibia, characterized in that, The device includes a locking plate body, the cross-section of which is an arc-shaped structure, and one surface of which is adapted to the shape of the medial surface of the tibia. The locking plate body is an integral structure consisting of a proximal head (1), a body (2), and a distal head (3). The proximal head (1) is connected to the first end of the body (2), and the distal head (3) is connected to the second end of the body (2). Both the proximal head (1) and the distal head (3) are provided with multiple universal through holes (4).

2. The tibial medial locking plate according to claim 1, characterized in that, There is a first torsion angle between the proximal head (1) and the body (2), the first torsion angle being the angle between the surface of the proximal head (1) extending to the body (2) and the surface of the body (2).

3. The tibial medial locking plate according to claim 2, characterized in that, There is a second torsion angle between the distal head (3) and the body (2), the second torsion angle being the angle between the surface of the distal head (3) extending to the body (2) and the surface of the body (2).

4. The tibial medial locking plate according to claim 3, characterized in that, The proximal head (1) is adapted to the upper end of the tibia, the body (2) is adapted to the shaft of the tibia, and the distal head (3) is adapted to the lower end of the tibia.

5. The tibial medial locking plate according to claim 1, characterized in that, The width of the proximal head (1) is greater than the width of the body (2) and the width of the distal head (3); the two sides of the connection between the proximal head (1) and the body (2) are concave arc-shaped.

6. The full-length locking plate on the medial side of the tibia according to claim 1, characterized in that, The body (2) is provided with a plurality of mounting holes (5), which are evenly arranged along the length of the body (2), and the mounting holes (5) are gourd-shaped.

7. The tibial medial locking plate according to claim 1, characterized in that, The locking plate body is made of titanium alloy.

8. The tibial medial locking plate according to claim 7, characterized in that, The locking plate body has a cuttable structure.

9. The full-length locking plate on the medial side of the tibia according to claim 1, characterized in that, The locking plate body is a large locking plate for men, a medium locking plate for men, a small locking plate for men, a large locking plate for women, a medium locking plate for women, or a small locking plate for women.

10. The full-length locking plate on the medial side of the tibia according to any one of claims 1-9, characterized in that, The edge of the locking plate body is a smooth arc surface structure; both the proximal head (1) and the distal head (3) have arc-shaped ends.

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