Medical inner bone fracture plate for avulsion fracture of proximal tibia posterior cruciate ligament

Abstract

The utility model discloses a medical inner bone fracture plate for avulsion fracture of a proximal tibia posterior cruciate ligament. The device comprises a straight part and a hook part, the straight part is an arc-shaped plate formed by cutting a tubular plate, the radian of the straight part is smaller than 90 degrees, and the straight part is bent with the radian adaptive to the shape of the rear wall of the upper end of the tibia; the joint of the straight part and the hook part is in arc transition; the bent hook part and the straight part are integrally arranged, the bent hook part is bent towards the inner arc surface of the straight part in an arc shape adaptive to the rear edge of the upper end of the tibia, the bent hook part comprises two claw parts, the tail ends of the two claw parts are sharp, the joint of the two claw parts is an arc transition surface, and the radian of the arc transition surface is 180-250 degrees; and a plurality of screw holes are formed in the straight part. According to the internal bone fracture plate, stress concentration can be reduced, a stable structure is formed, and the internal bone fracture plate can be rapidly and accurately positioned when placed.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to an internal bone plate for avulsion fractures of the proximal posterior cruciate ligament of the tibia. Background Technology

[0002] The posterior cruciate ligament (PCL) is a vital structure in the knee joint, its primary function being to prevent posterior tibial slippage. Avulsion fractures of the proximal posterior cruciate ligament insertion are a common sports injury, particularly following high-energy impacts or torsional events. This type of fracture requires precise surgical treatment to ensure optimal recovery and function.

[0003] In existing technical solutions, such as the internal fixation device for avulsion fractures of the proximal posterior cruciate ligament of the tibia with application announcement number CN 116269708 A, the straight part, the curved part, and the notch part are an integral plate structure. A V-shaped notch is provided on the curved part, and the notch extends forward to insert into the attachment area of ​​the posterior cruciate ligament. However, in this structure, there will be stress concentration at the V-shaped notch, the structure is unstable, and the position cannot be accurately and quickly determined when placing the internal fixation device. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and propose an internal bone plate for avulsion fractures of the proximal posterior cruciate ligament of the tibia, which can reduce stress concentration, form a stable structure, and enable rapid and accurate positioning when placing the internal bone plate.

[0005] To achieve the above objectives, the present invention proposes the following technical solution:

[0006] An internal bone plate for avulsion fracture of the proximal posterior cruciate ligament of the tibia includes a straight portion and a hook portion. The straight portion is an arc-shaped plate cut from a tubular plate, with an arc angle of less than 90°, and the straight portion is curved to conform to the shape of the posterior wall of the upper end of the tibia. The junction of the straight portion and the hook portion is a rounded transition. The hook portion is integrally formed with the straight portion, and the hook portion is curved inward toward the inner arc surface of the straight portion to conform to the posterior edge of the upper end of the tibia. The hook portion includes two claw portions, the ends of which are pointed, and the junction of the two claw portions is a rounded transition surface with an arc angle of 180~250°. The straight portion is provided with multiple screw holes.

[0007] Preferably, the central axis of each screw hole is on the plane of symmetry of the straight portion.

[0008] Preferably, the central axis of the arc transition surface is on the symmetry plane of the straight portion, and the claw portion is symmetrically arranged with respect to the symmetry plane of the straight portion.

[0009] Preferably, the hook portion and the inner arc surface of the straight portion are provided with an annular rough surface around the arc transition surface on the same side to increase the friction between the hook portion and the fracture site and optimize the positioning effect of the fracture site.

[0010] Preferably, the straight portion is provided with a plurality of waist-shaped screw holes as sliding holes. After the screw is screwed into the bone through the sliding holes, it generates appropriate pressure to promote close contact and healing of the fracture ends.

[0011] Preferably, the waist-shaped screw holes are symmetrically arranged on both sides of the straight symmetrical plane, with two or more rows of waist-shaped screw holes, and screws are staggered at both ends of the waist-shaped screw holes to form a cross-type fixing structure.

[0012] Preferably, three positioning marks are provided on the same side of the hook portion and the outer arc surface of the straight portion, around the arc transition surface. The positioning marks are pen-tip-shaped protrusions, with the tips of the positioning marks pointing towards the center of the arc transition surface, and the extension lines of the axes of the positioning marks passing through the central axis of the arc transition surface. The positioning marks are the first positioning mark, the second positioning mark, and the third positioning mark. The axes of the first positioning mark and the second positioning mark are collinear, and the extension lines of the axes of the first positioning mark and the second positioning mark are perpendicular to the plane of symmetry of the straight portion. The axis of the third positioning mark is on the plane of symmetry of the straight portion. When positioning the fracture plate, positioning can be achieved simply by aligning the center position of the fractured part with the three positioning marks, thus further optimizing the positioning effect.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention features two claws on the hook portion, which allow the bone plate to better fit the fracture site, resulting in better fixation.

[0015] This invention, by setting an arc transition surface at the junction of the two claws, can disperse stress, avoid the risk of stress concentration, and reduce postoperative complications such as infection, bleeding, bone plate loosening or fracture. At the same time, it improves the comfort and structural stability of the internal bone plate, enhances the durability and reliability of the internal bone plate, and makes the bone less prone to displacement during the healing process, thereby helping to accelerate the healing process, reduce postoperative discomfort and pain for patients, help reduce the risk of fracture recurrence, and improve the quality of life for patients.

[0016] The invention, through the design of the two claws and the arc transition surface, helps doctors to accurately place the internal bone plate at the fracture site, facilitating surgical operation and improving surgical efficiency.

[0017] This invention uses a circular arc transition surface with an arc angle of 180-250°. When placing the internal bone plate, the doctor only needs to align the center of the circular arc transition surface with the fracture site to prepare and position the internal bone plate, which improves the doctor's operating efficiency and reduces the operation time.

[0018] By adopting the above solution, this utility model can reduce stress concentration, improve the structural stability and comfort of the internal bone plate, and enable quick and accurate positioning when placing the internal bone plate, thereby improving the durability and reliability of the internal bone plate, helping to accelerate the healing process, reduce postoperative discomfort and pain for patients, reduce the risk of fracture recurrence, and improve the quality of life for patients. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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 from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the first embodiment.

[0021] Figure 2 This is a schematic diagram of the inner structure of the second embodiment.

[0022] Figure 3 This is a structural schematic diagram of the third embodiment.

[0023] Figure 4 This is a structural schematic diagram of the fourth embodiment.

[0024] Figure 5 This is a schematic diagram of the inner arc surface structure of the fourth embodiment.

[0025] Figure 6 This is a diagram showing the fourth embodiment and its use with screws.

[0026] Figure 7 This is a side view of the fourth embodiment used in conjunction with a screw.

[0027] Figure 8 This is a structural schematic diagram of the fifth embodiment.

[0028] In the figure, 1-straight part, 2-screw hole, 3-arc transition surface, 4-hook part, 5-annular rough surface, 6-screw, 31-first positioning mark, 32-second positioning mark, 33-third positioning mark. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] First embodiment:

[0034] like Figure 1 As shown, an internal bone plate for avulsion fracture of the proximal posterior cruciate ligament of the tibia includes a straight portion 1 and a hook portion 4. The straight portion 1 is an arc-shaped plate cut from a tubular plate, with an arc angle of less than 90°. The straight portion 1 is curved to adapt to the shape of the posterior wall of the upper end of the tibia. The junction of the straight portion 1 and the hook portion 4 is a rounded transition. The hook portion 4 is integrally formed with the straight portion 1. The hook portion 4 is curved in an arc shape towards the inner arc surface of the straight portion 1 to adapt to the posterior edge of the upper end of the tibia. The hook portion 4 includes two claw portions with pointed ends. The junction of the two claw portions is a rounded transition surface 3 with an arc angle of 180~250°. The straight portion 1 is provided with multiple screw holes 2.

[0035] The central axis of each screw hole 2 is on the plane of symmetry of the straight part 1.

[0036] The central axis of the arc transition surface 3 lies on the symmetry plane of the straight part 1, and the claw part is symmetrically arranged with respect to the symmetry plane of the straight part 1.

[0037] Second embodiment:

[0038] like Figure 1As shown, an internal bone plate for avulsion fracture of the proximal posterior cruciate ligament of the tibia includes a straight portion 1 and a hook portion 4. The straight portion 1 is an arc-shaped plate cut from a tubular plate, with an arc angle of less than 90°. The straight portion 1 is curved to adapt to the shape of the posterior wall of the upper end of the tibia. The junction of the straight portion 1 and the hook portion 4 is a rounded transition. The hook portion 4 is integrally formed with the straight portion 1. The hook portion 4 is curved in an arc shape towards the inner arc surface of the straight portion 1 to adapt to the posterior edge of the upper end of the tibia. The hook portion 4 includes two claw portions with pointed ends. The junction of the two claw portions is a rounded transition surface 3 with an arc angle of 180~250°. The straight portion 1 is provided with multiple screw holes 2.

[0039] like Figure 2 As shown, the hook portion 4 and the inner arc surface of the straight portion 1 are provided with an annular rough surface 5 around the arc transition surface 3 on the same side.

[0040] Third embodiment:

[0041] like Figure 3 As shown, an internal bone plate for avulsion fracture of the proximal posterior cruciate ligament of the tibia includes a straight portion 1 and a hook portion 4. The straight portion 1 is an arc-shaped plate cut from a tubular plate, with an arc angle of less than 90°. The straight portion 1 is curved to adapt to the shape of the posterior wall of the upper end of the tibia. The junction of the straight portion 1 and the hook portion 4 is a rounded transition. The hook portion 4 is integrally formed with the straight portion 1. The hook portion 4 is curved in an arc shape towards the inner arc surface of the straight portion 1 to adapt to the posterior edge of the upper end of the tibia. The hook portion 4 includes two claw portions with pointed ends. The junction of the two claw portions is a rounded transition surface 3 with an arc angle of 180~250°. The straight portion 1 is provided with multiple screw holes 2.

[0042] like Figure 3 As shown, the straight part 1 is provided with a plurality of waist-shaped screw holes 7, which serve as sliding holes. After the screw is screwed into the bone through the sliding holes, it generates appropriate pressure to promote close contact and healing of the fracture ends.

[0043] Fourth embodiment:

[0044] like Figure 4 As shown, an internal bone plate for avulsion fracture of the proximal posterior cruciate ligament of the tibia includes a straight portion 1 and a hook portion 4. The straight portion 1 is an arc-shaped plate cut from a tubular plate, with an arc angle of less than 90°. The straight portion 1 is curved to adapt to the shape of the posterior wall of the upper end of the tibia. The junction of the straight portion 1 and the hook portion 4 is a rounded transition. The hook portion 4 is integrally formed with the straight portion 1. The hook portion 4 is curved in an arc shape towards the inner arc surface of the straight portion 1 to adapt to the posterior edge of the upper end of the tibia. The hook portion 4 includes two claw portions with pointed ends. The junction of the two claw portions is a rounded transition surface 3 with an arc angle of 180~250°. The straight portion 1 is provided with multiple screw holes 2.

[0045] The straight part 1 is provided with a plurality of waist-shaped screw holes 7, which serve as sliding holes. After the screw 6 is screwed into the bone through the sliding holes, it generates appropriate pressure to promote close contact and healing of the fracture ends.

[0046] like Figures 6-7 As shown, the waist-shaped screw holes 7 are symmetrically arranged on both sides of the symmetrical plane of the straight part 1. There are two or more rows of waist-shaped screw holes 7, and the screws 6 are staggered at both ends of the waist-shaped screw holes 7 to form a cross-type fixing structure.

[0047] Fifth embodiment:

[0048] like Figure 8 As shown, an internal bone plate for avulsion fracture of the proximal posterior cruciate ligament of the tibia includes a straight portion 1 and a hook portion 4. The straight portion 1 is an arc-shaped plate cut from a tubular plate, with an arc angle of less than 90°. The straight portion 1 is curved to adapt to the shape of the posterior wall of the upper end of the tibia. The junction of the straight portion 1 and the hook portion 4 is a rounded transition. The hook portion 4 is integrally formed with the straight portion 1. The hook portion 4 is curved in an arc shape towards the inner arc surface of the straight portion 1 to adapt to the posterior edge of the upper end of the tibia. The hook portion 4 includes two claw portions with pointed ends. The junction of the two claw portions is a rounded transition surface 3 with an arc angle of 180~250°. The straight portion 1 is provided with multiple screw holes 2.

[0049] Three positioning marks are set on the same side of the outer arc surface of the hook part 4 and the straight part 1 around the arc transition surface 3. The positioning marks are pen-tip-shaped protrusions, with the tips of the positioning marks pointing towards the center of the arc transition surface 3. The extension line of the axis of the positioning mark passes through the central axis of the arc transition surface 3. The positioning marks are the first positioning mark 31, the second positioning mark 32 and the third positioning mark 33. The axes of the first positioning mark 31 and the second positioning mark 32 are collinear, and the extension lines of the axes of the first positioning mark 31 and the second positioning mark 32 are perpendicular to the symmetry plane of the straight part 1. The axis of the third positioning mark 33 is on the symmetry plane of the straight part 1. When positioning the fracture plate, it is only necessary to align the center position of the fracture part with the three positioning marks to achieve positioning, and the positioning effect is further optimized.

[0050] 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, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A medical tibial proximal posterior cruciate ligament avulsion fracture internal bone plate comprising a straight portion and a bent hook portion, characterized in that: The straight part is a circular arc plate cut from a tubular plate, the arc is less than 90 degrees, and the straight part is curved in an arc shape that is adapted to the shape of the posterior wall of the upper end of the tibia; the straight part and the hook part are connected by a circular arc transition; the hook part is integrally arranged with the straight part, the hook part is curved in an arc shape that is adapted to the posterior edge of the upper end of the tibia, and the hook part includes two claw parts, the ends of the two claw parts are pointed, the intersection of the two claw parts is a circular arc transition surface, and the arc of the circular arc transition surface is 180-250 degrees; a plurality of screw holes are arranged on the straight part.

2. The medical proximal tibial posterior cruciate ligament avulsion fracture internal bone plate according to claim 1, characterized in that: The central axes of the screw holes are on the symmetry plane of the straight part.

3. The medical proximal tibial posterior cruciate ligament avulsion fracture internal bone plate according to claim 1, characterized in that: The central axis of the circular arc transition surface is on the symmetry plane of the straight part, and the claw parts are symmetrically arranged relative to the symmetry plane of the straight part.

4. The medical proximal tibial posterior cruciate ligament avulsion fracture internal bone plate according to claim 1, characterized in that: An annular rough surface is arranged around the circular arc transition surface on the same side of the inner arc surface of the straight part and the hook part.

5. The medical proximal tibial posterior cruciate ligament avulsion fracture internal bone plate according to claim 1, characterized in that: A plurality of waist-shaped screw holes are arranged on the straight part.

6. The medical proximal tibial posterior cruciate ligament avulsion fracture internal bone plate according to claim 1, characterized in that: Three positioning marks are arranged around the circular arc transition surface on the same side of the outer arc surface of the straight part and the hook part, the positioning marks are pen-shaped protrusions, the tips of the positioning marks are directed to the center of the circular arc transition surface, the extension of the axis of the positioning mark passes through the central axis of the circular arc transition surface; the positioning marks are a first positioning mark, a second positioning mark and a third positioning mark, the axes of the first positioning mark and the second positioning mark are collinear, and the extension of the axes of the first positioning mark and the second positioning mark is perpendicular to the symmetry plane of the straight part; the axis of the third positioning mark is on the symmetry plane of the straight part.

7. The medical proximal tibial posterior cruciate ligament avulsion fracture inner bone plate according to claim 5, characterized in that: The waist-shaped screw holes are symmetrically arranged on both sides of the symmetry plane of the straight part, and the waist-shaped screw holes are arranged in two or more rows.

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