Distal femoral rotational osteotomy correction fixation plate

Abstract

The utility model provides a kind of distal femur rotary osteotomy orthopedic fixed steel plate, including steel plate body and protruding part;The bottom of steel plate body has step surface, protruding part is set in the bottom of steel plate body, steel plate body and protruding part integrally connect, the protruding end of protruding part is towards the inside or outside of steel plate body, the bottom of steel plate body and protrusion are consistent with the surface arc of the bone cortex after current patient orthopedic, step surface can be contacted with the step of the contact surface of two fracture ends, the protruding end of protruding part is located at the edge of ligament attachment point, the bottom of protruding part and the side portion away from protruding end are located at the bone boundary after current patient orthopedic;Steel plate body is equipped with first screw hole structure, and protruding part is equipped with second screw hole structure.The utility model discloses a kind of distal femur rotary osteotomy orthopedic fixed steel plate, solve the problem that the steel plate in related art is not enough in the aspect of fixed stability, leading to distal femur outside steel plate cannot completely satisfy this high stress demand.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, and in particular relates to a distal femoral rotational osteotomy orthopedic fixation plate. Background Technology

[0002] The distal femoral rotational osteotomy lateral plate is a surgical instrument used to correct distal femoral deformities and provide stable fixation. It is interchangeable with distal femoral fracture plates and can be adjusted for fixation based on the patient's specific condition. Its main function is to provide stable support after osteotomy correction, facilitating faster patient recovery.

[0003] After distal femoral rotational osteotomy, the bone needs to withstand significant torsional stress. Due to the inadequacy of the fixation stability of the plates used in related techniques, the lateral distal femoral plates cannot fully meet this high stress requirement. Stress concentration may increase the risk of nonunion or delayed healing, thus affecting the final outcome of the surgery.

[0004] The distal femur has a complex anatomy, and its shape and angles change after rotational correction. Due to the limitations of the lateral plate in these techniques, there is often a lack of proper fit between the plate and the bone after rotational correction. The plate cannot fully adapt to these changes, resulting in insufficient contact area between the plate and the bone and suboptimal fixation. This lack of fit not only affects the stability of fixation but may also irritate or compress surrounding soft tissues, increasing the risk of postoperative complications.

[0005] Furthermore, lateral plate placement may also cause iliotibial band syndrome. The iliotibial band is an important structure located on the outer side of the thigh, and the lateral plate is placed adjacent to it. If the plate is not designed properly or the surgical procedure is not performed correctly, it may cause direct pressure or friction on the iliotibial band, leading to local inflammation, pain, or even functional impairment. Summary of the Invention

[0006] In view of this, the present invention aims to at least partially solve one of the related technical problems.

[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0008] A distal femoral rotational osteotomy fixation plate includes a plate body and a protrusion.

[0009] The bottom of the steel plate body has a stepped surface, and the protrusion is located at the bottom of the steel plate body. The steel plate body and the protrusion are integrally connected. The protruding end of the protrusion faces the inner or outer side of the steel plate body. The bottom of the steel plate body and the protrusion are consistent with the surface curvature of the bone cortex after the current patient's correction. The stepped surface can match the step that appears at the contact surface of the two fracture ends. The protruding end of the protrusion is located at the edge of the ligament attachment point. The bottom of the protrusion and the side away from the protruding end are both located at the bone boundary after the current patient's correction.

[0010] The steel plate body is provided with a first screw hole structure, the protrusion is provided with a second screw hole structure, and the fracture line is located between the first screw hole structure and the second screw hole structure.

[0011] Furthermore, the first screw hole structure includes a plurality of first threaded holes, which are evenly arranged at the centerline position of the steel plate body.

[0012] Furthermore, the number of the first threaded holes is 4-6.

[0013] Furthermore, the first threaded hole located at the top of the steel plate body is 3-5mm away from the top edge of the steel plate body.

[0014] Furthermore, the second threaded hole structure includes a plurality of second threaded holes, which are evenly distributed on the protrusion.

[0015] Furthermore, the second threaded hole at the protruding end of the protrusion is within 3mm of the outer edge of the protrusion.

[0016] Furthermore, the second threaded hole located at the bottom of the protrusion is 3-5 mm away from the side edge of the protrusion, and the second threaded hole located on the side of the protrusion away from the protrusion end is 3-5 mm away from the side edge of the protrusion.

[0017] Furthermore, the number of the second threaded holes is 4-5.

[0018] Furthermore, the thickness of both the steel plate body and the protrusion is 3-5mm.

[0019] Furthermore, the top and corners of the steel plate body and the protrusions are all rounded.

[0020] Compared with existing technologies, the distal femoral rotational osteotomy and fixation plate of this invention has the following advantages:

[0021] 1. The stepped surface allows for excellent alignment with the two fracture ends after osteotomy, ensuring tight postoperative fixation and promoting healing. Furthermore, the stepped surface helps to position and correct any step-like appearance at the contact surface between the fracture ends. Once the corrected bone is fully attached to the plate, the corrective outcome matches the preoperative design. The stepped structure effectively increases the contact area between the fracture ends, improving postoperative fixation stability and preventing slippage and displacement. It also effectively disperses force, reducing local stress concentration and minimizing the risk of plate breakage or loosening. Good contact between the fracture ends promotes postoperative bone healing and regeneration, shortening recovery time.

[0022] 2. The plate body and its protrusions are completely consistent with the curvature of the femoral surface after osteotomy and rotation correction, ensuring complete adhesion between the plate and the bone cortex, reducing friction with soft tissues, and enhancing screw stability. All edges and corners of the plate body are rounded to avoid irritating soft tissues after implantation, causing unnecessary damage, and affecting healing. Attached Figure Description

[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0024] Figure 1 This is a schematic diagram of a distal femoral rotational osteotomy and fixation plate according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the orthopedic fixing steel plate and screw combination structure described in an embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the orthopedic fixation steel plate used in an embodiment of this utility model.

[0027] Figure 4 This is a side view of the orthopedic fixation steel plate described in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the stepped structure that appears at the contact surface of the fracture ends of the two bones in an embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100, Steel plate body; 200, Protrusion; 310, First threaded hole; 311, First screw; 320, Second threaded hole; 321, Second screw; 400, Step. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, 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. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] A distal femoral rotational osteotomy fixation plate, such as Figure 1 As shown, it includes a steel plate body 100 and a protrusion 200; the bottom of the steel plate body 100 has a stepped surface, and the protrusion 200 is disposed at the bottom of the steel plate body 100. The steel plate body 100 and the protrusion 200 are integrally connected. The protruding end of the protrusion 200 faces the inner or outer side of the steel plate body 100. The bottom of the steel plate body 100 and the protrusion are consistent with the surface curvature of the bone cortex after the current patient's correction.

[0036] The bottom of the steel plate body 100 has a stepped surface. After distal femoral osteotomy and horizontal rotational correction along the fracture line, a step 400 appears at the contact surface of the two fracture ends. The stepped surface can match the step 400 at the contact surface of the two fracture ends. Figure 5As shown. The protruding end of the protrusion 200 is located at the edge of the ligament attachment point, and the bottom and the side of the protrusion 200 away from the protruding end are located at the current corrected bone boundary of the patient. The stepped surface can achieve good docking with the two fracture ends after osteotomy, ensuring that the fracture ends can fit tightly after surgery, thereby promoting healing. Through the stepped mating structure of the stepped surface, the contact area of ​​the fracture ends can be effectively increased, improving the stability of postoperative fixation and preventing the fracture ends from sliding and displacing. It can effectively disperse force distribution, reduce local stress concentration, and reduce the risk of plate breakage or loosening. Good contact of the fracture ends helps bone tissue to heal and regenerate after surgery, shortening the recovery time. Furthermore, the stepped surface can play a positioning and corrective role for the step that appears on the contact surface of the two fracture ends. As long as the corrected bone is completely attached to the plate, the corrective result consistent with the preoperative design will be achieved.

[0037] The steel plate body 100 has a first threaded hole structure, and the protrusion 200 has a second threaded hole structure. The fracture line is located between the first threaded hole structure and the second threaded hole structure. The first threaded hole structure includes multiple first threaded holes 310, which are evenly arranged at the centerline of the steel plate body 100. In this example, there are four first threaded holes 310. The first threaded holes 310 located at the top of the steel plate body 100 are 3-5 mm away from the top edge of the steel plate body 100.

[0038] The second threaded hole structure includes multiple second threaded holes 320, which are evenly distributed on the protrusion 200. The second threaded holes 320 at the protruding end of the protrusion 200 are within 3 mm of the outer edge of the protrusion 200. The second threaded holes 320 at the bottom of the protrusion 200 are 3-5 mm from the lateral edge of the protrusion 200, and the second threaded holes 320 on the side of the protrusion 200 away from the protruding end are also 3-5 mm from the lateral edge of the protrusion 200. There are five second threaded holes 320. The bottom of the plate is located anterior to the lateral femoral condyle, avoiding ligament attachment points. Four first screws 311 on the proximal end of the osteotomy surface are located at the center of the plate and pass through the center of the femur. Five second screws 321 on the distal end of the osteotomy surface are distributed on the protrusion 200, pointing obliquely downwards towards the medial aspect of the distal femur, avoiding the intercondylar fossa. In practical applications, steel plates serve an orthopedic function. Once the corrected bone is fully attached to the steel plate, the corrective result matches the preoperative design. The steel plate body 100 and its protrusions 200 perfectly match the curvature of the femoral surface after osteotomy and rotation correction, ensuring complete attachment between the plate and the bone cortex, reducing friction with soft tissues, and enhancing screw stability. All edges and corners of the steel plate body 100 are rounded to avoid irritating soft tissues after implantation, preventing unnecessary damage and affecting healing.

[0039] The thickness of both the steel plate body 100 and the protrusion 200 is 3-5mm. The top of the steel plate body 100 and the corners of the protrusion 200 are rounded.

[0040] How this example works

[0041] The patient's preoperative CT image data is imported into the computer three-dimensional reconstruction system. Based on the correction principle, a femoral rotational osteotomy correction plan is customized to obtain a femoral model after rotational osteotomy correction. Then, according to the patient's femoral length, changes and characteristics of the surface curvature of the bone cortex, a correction and fixation plate is customized and made that is completely consistent with the surface curvature of the current patient's bone cortex. The bottom of the plate should avoid ligament attachment points; the step surface and the protrusion 200 are consistent with the surface curvature direction of the current patient's corrected femoral bone cortex.

[0042] The obtained steel plate model is processed and shaped, for example, by using 3D printing equipment to print the steel plate, and then polishing and other subsequent operations to obtain the orthopedic and fixed steel plate.

[0043] In use, the position of the protrusion 200 is aligned with the step created by the rotational osteotomy to ensure perfect adhesion between the steel plate body 100 and the protrusion 200 and the bone cortex. Then, screws are inserted into the screw holes for fixation.

[0044] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A distal femoral rotational osteotomy fixation plate, characterized in that: Includes a steel plate body (100) and a protrusion (200); The bottom of the steel plate body (100) has a stepped surface, and the protrusion (200) is disposed at the bottom of the steel plate body (100). The steel plate body (100) and the protrusion (200) are integrally connected. The protruding end of the protrusion (200) faces the inner or outer side of the steel plate body (100). The bottom of the steel plate body (100) and the protrusion are consistent with the surface curvature of the bone cortex after the current patient's correction. The stepped surface can match the step (400) that appears on the contact surface of the two fracture ends. The protruding end of the protrusion (200) is located at the edge of the ligament attachment point. The bottom of the protrusion (200) and the side away from the protruding end are both located at the bone boundary after the current patient's correction. The steel plate body (100) is provided with a first screw hole structure, the protrusion (200) is provided with a second screw hole structure, and the fracture line is located between the first screw hole structure and the second screw hole structure.

2. The distal femoral rotational osteotomy fixation plate according to claim 1, characterized in that: The first screw hole structure includes a plurality of first threaded holes (310), which are evenly arranged at the centerline position of the steel plate body (100).

3. The distal femoral rotational osteotomy fixation plate according to claim 2, characterized in that: The number of the first threaded holes (310) is 4-6.

4. The distal femoral rotational osteotomy fixation plate according to claim 2, characterized in that: The first threaded hole (310) located at the top of the steel plate body (100) is 3-5 mm away from the top edge of the steel plate body (100).

5. A distal femoral rotational osteotomy fixation plate according to any one of claims 1-4, characterized in that: The second threaded hole structure includes a plurality of second threaded holes (320), which are evenly distributed on the protrusion (200).

6. The distal femoral rotational osteotomy fixation plate according to claim 5, characterized in that: The second threaded hole (320) at the protruding end of the protrusion (200) is within 3 mm from the outer edge of the protrusion (200).

7. The distal femoral rotational osteotomy fixation plate according to claim 5, characterized in that: The second threaded hole (320) located at the bottom of the protrusion (200) is 3-5 mm away from the side edge of the protrusion (200), and the second threaded hole (320) located on the side of the protrusion (200) away from the protrusion end is 3-5 mm away from the side edge of the protrusion (200).

8. The distal femoral rotational osteotomy fixation plate according to claim 5, characterized in that: The number of the second threaded holes (320) is 4-5.

9. The distal femoral rotational osteotomy fixation plate according to claim 5, characterized in that: The thickness of both the steel plate body (100) and the protrusion (200) is 3-5 mm.

10. The distal femoral rotational osteotomy fixation plate according to claim 5, characterized in that: The top of the steel plate body (100) and the corners of the protrusion (200) are all rounded.

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