Tibial secondary osteotomy adjuster

Abstract

The present application relates to the technical field of medical devices, and in particular to a tibial secondary osteotomy adjuster. The adjuster comprises a fixing mechanism and a swing mechanism. The fixing mechanism comprises a platform, a connecting block, a neck and an indication scale. The swing mechanism comprises a swing block and a pointer. The swing block is hinged with the connecting block. Two groups of nail holes are symmetrically formed on the swing block. The connecting block is located between the two groups of nail holes. The swing block is connected with the pointer. The pointer points to the indication scale. The platform can be placed on the tibial platform surface which has been cut. After the platform is placed, the swing block of the swing mechanism swings. The pointer points to the indication scale to show the varus / valgus angle. According to the measurement result, the tibial bone mass and the varus / valgus angle which need to be thickened or thinned are selected. The fixing nail is punched into the bone from the target nail hole of the two groups of nail holes. Then the osteotomy adjuster is taken out. The osteotomy block is sleeved on the fixing nail to perform osteotomy. Thus, the secondary accurate osteotomy of the tibia can be realized.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a tibial secondary osteotomy adjuster. Background Technology

[0002] For patients with advanced knee joint disease, total knee arthroplasty is a widely used and highly effective treatment method. The degree of lower limb alignment restoration is related to the long-term stability of the prosthesis and the patient's surgical satisfaction. Therefore, choosing the appropriate prosthesis placement angle and position is crucial. The placement of the tibial prosthesis determines the placement angle and position of the entire knee joint prosthesis. Existing tibial osteotomy tools still have some shortcomings in practical use, such as the inability to perform precise osteotomy based on the patient's own lower limb alignment. Summary of the Invention

[0003] The purpose of this invention is to provide a tibial secondary osteotomy adjuster that overcomes the shortcomings of the prior art. It performs secondary adjustments after the initial tibial structure and can perform precise osteotomy according to the patient's own lower limb force line, restoring the patient's preoperative force line state to the greatest extent.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A tibial secondary osteotomy adjuster includes a fixation mechanism and a swinging mechanism, wherein:

[0006] The fixing mechanism includes a platform, a connecting block, a neck, and an indicator scale. The connecting block is provided on one end face of the two end faces of the platform, and the neck is provided on the other end face. The indicator scale is provided on the neck.

[0007] The swing mechanism includes a swing block and a pointer. The swing block is hinged to the connecting block. Two sets of nail holes are symmetrically opened on the swing block. The connecting block is located between the two sets of nail holes. A pointer is connected to the swing block and points to the indicator scale.

[0008] The platform can be placed on the pre-cut tibial plateau surface. The swing block of the rear swing mechanism swings, and the inversion / valgus angle is displayed by the pointer pointing to the indicator scale. Based on the measurement results, the amount of tibial bone to be cut with or without thickness and the inversion / valgus angle are selected. The fixation pin is driven into the bone through the target pin holes of the two sets of pin holes. Then, the osteotomy adjuster is taken out, and the osteotomy block is put into the fixation pin for osteotomy. This can achieve a second precise osteotomy of the tibia.

[0009] Furthermore, the connecting block is located below the platform, and the neck is located above the platform. A wide plate is provided at the top of the neck, and the wide plate displays an angle indicator scale. A protruding arc-shaped guide plate is provided at the upper end of the wide plate, and one-way teeth are spaced apart on the lower end face of the arc-shaped guide plate. The pointer includes a fixed rod, a movable rod, and a spring. The fixed rod is located above the swing block and has a through hole. The movable rod is inserted into the through hole of the fixed rod. An elongated groove is opened on the movable rod, and a pin is fixed in the through hole. The pin passes through the elongated groove. One end of the spring is fixed in the through hole, and the other end is fixed to the movable rod. A tip is provided at the top of the movable rod. Under the action of the spring, the tip is locked between two adjacent one-way teeth. Under the action of gravity, when the swing block swings, the tip is displaced between the one-way teeth. After reaching the accurate position, it can quickly stabilize under the action of the spring and stop swinging, so as to facilitate the rapid determination of the inward and outward turning angles.

[0010] Furthermore, each group of nail holes includes zero-degree nail holes, added-thickness nail holes, and reduced-thickness nail holes. Added-thickness nail holes are nail holes for adding a certain thickness for bone resection, and reduced-thickness nail holes are nail holes for removing a certain thickness for bone resection.

[0011] Furthermore, the swing block is equipped with a counterweight to facilitate the swinging effect under the action of gravity.

[0012] Furthermore, the platform is equipped with clearance slots.

[0013] The beneficial effects of the present invention are as follows: Compared with the prior art, the tibial secondary osteotomy adjuster of the present invention has the following advantages: It can perform secondary osteotomy of the tibia according to the patient's own lower limb alignment, and can adjust the varus and valgus angles, as well as perform osteotomy with or without increasing or decreasing bone thickness, assisting doctors in completing precise osteotomy, restoring the lower limb alignment to the greatest extent, and reducing the patient's discomfort. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0016] Figure 3 This is an exploded view of the structure of the present invention;

[0017] The components include: 1. Platform; 2. Connecting block; 3. Neck; 4. Indicator scale; 5. Swing block; 6. Pointer; 7. Wide plate; 8. Arc-shaped guide plate; 9. One-way tooth; 10. Spring; 11. Long strip groove; 12. Pin shaft; 13. Zero-degree nail hole; 14. Added nail hole; 15. Reduced nail hole; and 16. Clearance groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0019] like Figure 1-3 In the illustrated embodiment, a tibial secondary osteotomy adjuster includes a fixation mechanism and a swinging mechanism, wherein:

[0020] The fixing mechanism includes a platform 1, a connecting block 2, a neck 3, and an indicator scale 4. The connecting block 2 is provided on one end face of the two end faces of the platform 1, and the neck 3 is provided on the other end face. The indicator scale 4 is provided on the neck 3.

[0021] The swing mechanism includes a swing block 5 and a pointer 6. The swing block 5 is hinged to the connecting block 2. Two sets of nail holes are symmetrically opened on the swing block 5. The connecting block 2 is located between the two sets of nail holes. The pointer 6 is connected to the swing block 5 and points to the scale 4.

[0022] The platform 1 can be placed on the already cut tibial platform 1. The swing block 5 with the rear swing mechanism swings, and the pointer 6 points to the indicator scale 4 to display the inversion and valgus angle. According to the measurement results, the amount of tibial bone to be cut with increased or decreased thickness and the inversion and valgus angle are selected. The fixation nail is driven into the bone from the target nail holes of the two sets of nail holes. Then, the osteotomy adjuster is taken out, and the osteotomy block is put into the fixation nail for osteotomy. This can achieve a second precise osteotomy of the tibia.

[0023] In this embodiment, the connecting block 2 is located below the platform 1, and the neck 3 is located above the platform 1. A wide plate 7 is provided on the top of the neck 3, and the wide plate 7 displays angle indicator scales 4. A protruding arc-shaped guide plate 8 is provided at the upper end of the wide plate 7, and one-way teeth 9 are provided at intervals on the lower end face of the arc-shaped guide plate 8. The pointer 6 includes a fixed rod, a movable rod, and a spring 10. The fixed rod is located above the swing block 5, and a through hole is provided on the fixed rod. The movable rod is inserted into the through hole of the fixed rod, and an opening is provided on the movable rod. A long strip groove 11 is provided, and a pin 12 is fixed in the through hole. The pin 12 passes through the long strip groove 11. One end of the spring 10 is fixed in the through hole, and the other end is fixed to the movable rod. The top of the movable rod is provided with a tip. Under the action of the spring 10, the tip is stuck between two adjacent one-way teeth 9. Under the action of gravity, when the swing block 5 swings, the tip is displaced between the one-way teeth 9. After the position reaches the accurate position, it can quickly maintain stability under the action of the spring 10 and stop swinging, so as to facilitate the quick determination of the inward and outward turning angles.

[0024] In this embodiment, each group of nail holes includes a zero-degree nail hole 13, a nail hole for adding a certain thickness for fixation, and a nail hole for removing a certain thickness for osteotomy.

[0025] In this embodiment, a counterweight is provided on the swing block 5 to facilitate the smooth swinging effect under the action of gravity.

[0026] In this embodiment, the platform 1 is provided with a clearance groove 16.

[0027] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product form and style of the above-described specific embodiments. Any appropriate changes or modifications made by a person skilled in the art that conform to the claims of the present invention should fall within the patent protection scope of the present invention.

Claims

1. A tibial secondary osteotomy adjuster, characterized in that: It includes a fixed mechanism and a swinging mechanism, wherein: The fixing mechanism includes a platform, a connecting block, a neck, and an indicator scale. The platform is provided with a clearance groove, one end face of the platform is provided with a connecting block, the other end face is provided with a neck, and the neck is provided with an indicator scale. The swing mechanism includes a swing block and a pointer. A counterweight is provided on the swing block. The swing block is hinged to the connecting block. Two sets of nail holes are symmetrically opened on the swing block. Each set of nail holes includes a zero-degree nail hole, a cutting nail hole, and a cutting nail. The connecting block is located between the two sets of nail holes. A pointer is connected to the swing block and points to the indicating scale. The platform can be placed on the already cut tibial plateau surface; The connecting block is located below the platform, and the neck is located above the platform. A wide plate is provided on the top of the neck, and the wide plate displays an angle indicator scale. The upper end of the wide plate is provided with a protruding arc-shaped guide plate, and the lower end surface of the arc-shaped guide plate is provided with unidirectional teeth at intervals. The pointer includes a fixed rod, a movable rod, and a spring. The fixed rod is positioned above the swing block and has a through hole. The movable rod is inserted into the through hole of the fixed rod and has an elongated groove. A pin is fixed in the through hole and passes through the elongated groove. One end of the spring is fixed in the through hole, and the other end is fixed to the movable rod. The top of the movable rod has a pointed tip, which is engaged between two adjacent one-way teeth under the action of the spring.

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