Ankle joint prosthesis talus component

Abstract

This invention provides a talus component for an ankle joint prosthesis, belonging to the field of medical devices. It includes a talus, a tibia, a talus prosthesis, and a trochlear module. The surface of the talus is provided with a connecting mechanism for fixing the talus prosthesis. The interior of the limiting sleeve is provided with a fixing mechanism for fixing the trochlear module to the tibia or the human tibia. This invention, by setting a fixing mechanism, creates a limiting groove at the bottom of the tibia. The trochlear module is inserted into the limiting groove through the limiting sleeve. Tightening the threaded rod moves it forward, pushing a pusher forward, which in turn moves a wedge outward, causing the wedge to protrude from the peripheral wall of the limiting sleeve and embed itself in the tibia. This increases the pull-out resistance of the limiting sleeve. Simultaneously, one end of the rotating rod is threadedly connected to the tibia, allowing the trochlear module to be more stably fixed in the tibia through the limiting sleeve, thereby reducing the likelihood of loosening after implantation.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to a talus component of an ankle joint prosthesis. Background Art

[0002] The ankle joint, composed of the talus, distal tibia, and distal fibula, is divided into three parts: head, neck, and body. It is the joint that bears the most weight in the human body. Ankle osteoarthritis is a progressive degenerative disease of the ankle joint. Severe ankle osteoarthritis can cause loss of ankle joint function and deformity, seriously affecting patients' daily life and work. With a deeper understanding of ankle joint anatomy and biomechanics, and improvements in materials and manufacturing technology, ankle joint prosthesis replacement has shown good clinical efficacy and safety, and is increasingly accepted by patients. Artificial ankle joint replacement surgery is an effective clinical treatment for ankle injuries caused by trauma or disease. The artificial ankle joint consists of a tibial component, a talus component, and a liner. Common liner materials are polymers or metals, while the talus component is made of metal, ceramic, or polymer materials. The talus component and the liner form a friction pair.

[0003] However, most artificial ankle joint fixation devices use an elliptical medullary nail connected to the talus or tibia. This method has a single fixation point, which can easily lead to loosening of the talus or tibia prosthesis, thus affecting the movement of the artificial ankle joint. Summary of the Invention

[0004] In view of the problem that the existing cutting devices cannot be adjusted according to the cutting needs of steel bars of different lengths and specifications, and can only cut steel bars of fixed lengths, the purpose of this invention is to provide a talus component for an ankle joint prosthesis.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] An ankle joint prosthesis talus assembly includes a talus, a tibial component, a talus prosthesis, and a trochlear module. The bottom of the tibial component has a limiting groove, and the inner wall of the limiting groove is slidably connected to a limiting sleeve. The bottom of the limiting sleeve is fixedly connected to the trochlear module. The surface of the talus is provided with a connecting mechanism for fixing the talus prosthesis.

[0007] The limiting sleeve has a fixing mechanism inside for fixing the trolley module to the tibia or human tibia. The fixing mechanism includes a sliding groove, a slider, an inclined block and a push block. The trolley module has two sets of sliding grooves. The inner walls of the two sets of sliding grooves are slidably connected to sliders. The tops of the two sets of sliders are fixedly connected to inclined blocks. One side surface of the inclined block is provided with a push block.

[0008] The top of the tibia member is provided with an adjustment mechanism that can lengthen the tibia.

[0009] Optionally, one side of each of the two sets of inclined blocks is provided with an inclined surface, and both sides of the push block are provided with inclined surfaces, and the inclined surface of the push block cooperates with the inclined surface of the inclined block.

[0010] Optionally, the inner wall of the limiting sleeve is threaded with a threaded rod, one end of which is fixedly connected to a rotating rod, and the inside of the push block is slidably connected to a rotating rod, one end of which cooperates with the tibia piece, and one end of the rotating rod is pointed.

[0011] Optionally, the inner wall dimensions of the groove match the outer wall dimensions of the slider.

[0012] Optionally, the connecting mechanism includes a groove, a protrusion, a first bolt hole, a first screw, a second bolt hole, and a second screw. Two sets of grooves are provided on the surface of the talus. A protrusion is slidably connected to the inner wall of the groove, and a talus prosthesis is fixedly connected to the surface of the protrusion.

[0013] Optionally, a first bolt hole is provided on one side of the surface of the talus prosthesis, and a second bolt hole is provided on the other side. A first screw is slidably connected to the inner wall of the first bolt hole, and one end of the first screw engages with the talus. A second screw is slidably connected to the inner wall of the second bolt hole, and one end of the second screw engages with the talus.

[0014] Optionally, the adjustment mechanism includes a slot, a friction block, a locking block, a tibial prosthesis, a third bolt hole, a third screw, and a connecting groove. The top of the tibial component has a slot, and a locking block is slidably connected inside the slot. A friction block is fixedly connected to the inner wall of the slot and the outer wall of the locking block, and the top of the locking block is fixedly connected to the tibial prosthesis.

[0015] Optionally, a third bolt hole is provided on the surface of the tibia component, and a third screw is threaded into the internal part of the third bolt hole. One end of the third screw cooperates with the locking block and the tibia component, and a connecting groove is provided on the top of the tibia prosthesis.

[0016] Optionally, the top of the talus prosthesis is provided with an arcuate convex surface, and the bottom of the trochlear module is provided with a sliding pad. The arcuate convex surface is adapted to the lower surface of the sliding pad to form a smooth motion joint.

[0017] Optionally, the tibial component, talus prosthesis, trochlear module, and tibial prosthesis are made of titanium alloy.

[0018] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects:

[0019] In the above solution, by setting a connecting mechanism, two sets of grooves are opened on the surface of the talus. Bone cement is applied to the bottom of the talus prosthesis, so that the talus prosthesis is inserted into the grooves opened on the talus through the protrusions. The use of bone cement can enhance the connection strength between the talus prosthesis and the talus, so that the talus prosthesis can be locked on the talus. By tightening the first screw and the second screw to the talus, the talus prosthesis is stably fixed on the talus, thereby reducing the loosening of the talus prosthesis after implantation.

[0020] By setting up a fixation mechanism, a limiting groove is opened at the bottom of the tibia. The trochlear module is inserted into the limiting groove through a limiting sleeve. The threaded rod is turned, and the threaded rod passes through the limiting sleeve. When the threaded rod moves to a certain position in the limiting sleeve, one end of the threaded rod contacts the rear end of the push block, and the rotating rod is inserted into the push block. When the threaded rod moves forward, it can push the push block forward. At the same time, the push block drives the inclined block to move outward, so that the inclined block protrudes from the peripheral wall of the limiting sleeve and embeds into the tibia. This can increase the pull-out resistance of the limiting sleeve. Meanwhile, one end of the rotating rod is threaded to the tibia, so that the trochlear module is more stably fixed in the tibia through the limiting sleeve, thereby reducing the loosening of the trochlear module after implantation.

[0021] By setting an adjustment mechanism, when necrosis occurs in the tibia, the necrotic tissue needs to be removed. Based on the length of the removed tibia, the tibial component is extended. The tibial prosthesis is inserted into the slot opened in the tibial component through a locking block, so that the tibial prosthesis can be locked onto the tibial component. Then, the tibial prosthesis is fixed with a third screw, so that the tibial component can be extended. Attached Figure Description

[0022] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the talus and the talus prosthesis of the present invention.

[0025] Figure 3 This is a schematic diagram of the connection mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the mating structure of the groove and the protrusion of the present invention;

[0027] Figure 5 This is a schematic diagram of the matching structure of the limiting groove and the limiting sleeve of the present invention;

[0028] Figure 6 This is a schematic diagram of the mating structure of the threaded rod and the rotating rod of the present invention;

[0029] Figure 7 This is a schematic diagram of the fixing mechanism of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the limiting sleeve and the trolley module of the present invention.

[0031] Figure 9 This is a schematic diagram of the groove and slider mating structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the adjustment mechanism of the present invention.

[0033] [Figure Labels]

[0034] 1. Talus; 2. Tibial component; 3. Talus prosthesis;

[0035] 4. Connecting mechanism; 401. Groove; 402. Protrusion; 403. First bolt hole; 404. First screw; 405. Second bolt hole; 406. Second screw;

[0036] 5. Limiting groove; 6. Limiting sleeve; 7. Trolley module;

[0037] 8. Fixing mechanism; 801. Slide groove; 802. Sliding block; 803. Inclined block; 804. Push block; 805. Threaded rod; 806. Rotating rod;

[0038] 9. Adjustment mechanism; 901. Slot; 902. Friction block; 903. Locking block; 904. Tibial prosthesis; 905. Third bolt hole; 906. Third screw; 907. Connecting groove;

[0039] 10. Curved convex surface; 11. Sliding pad.

[0040] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0042] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when describing a specific feature, structure, or characteristic in conjunction with embodiments, the implementation of such feature, structure, or characteristic should be within the knowledge of those skilled in the art, regardless of whether it is explicitly described.

[0043] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0044] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0045] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0046] like Figures 1 to 10 As shown, this embodiment of the invention provides a talus component for an ankle joint prosthesis, including a talus 1, a tibia 2, a talus prosthesis 3, and a trochlear module 7. A limiting groove 5 is formed at the bottom of the tibia 2, and a limiting sleeve 6 is slidably connected to the inner wall of the limiting groove 5. The trochlear module 7 is fixedly connected to the bottom of the limiting sleeve 6, allowing the trochlear module 7 to be inserted into the limiting groove 5 via the limiting sleeve 6. The invention is characterized in that the surface of the talus 1 is provided with a connecting mechanism 4 for fixing the talus prosthesis 3, making the fixation between the talus 1 and the talus prosthesis 3 more stable.

[0047] The limiting sleeve 6 has a fixing mechanism 8 inside for fixing the trolley module to the tibia part 2 or the human tibia. The fixing mechanism 8 includes a groove 801, a slider 802, an inclined block 803 and a push block 804. The surface of the trolley module 7 has two sets of grooves 801. The inner walls of the two sets of grooves 801 are slidably connected to the slider 802, so that the slider 802 can slide in the grooves 801. The top of the two sets of sliders 802 is fixedly connected to the inclined block 803. One side surface of the inclined block 803 is provided with a push block 804.

[0048] The top of the tibia component 2 is provided with an adjustment mechanism 9 that can extend the tibia, which can extend the tibial prosthesis 904 according to the tibia resection requirements;

[0049] It also includes that one side of each of the two sets of inclined blocks 803 is provided with an inclined surface, and both sides of the push block 804 are provided with inclined surfaces. The inclined surface of the push block 804 cooperates with the inclined surface of the inclined block 803, so that when the push block 804 moves forward, the inclined block 803 can move outward.

[0050] The inner wall of the limiting sleeve 6 is threaded with a threaded rod 805. One end of the threaded rod 805 is fixedly connected to a rotating rod 806. The rotating rod 806 is slidably connected inside the push block 804. One end of the rotating rod 806 cooperates with the tibia part 2. One end of the rotating rod 806 is pointed to facilitate the threaded connection between the rotating rod 806 and the tibia part 2. When the threaded rod 805 is turned, the threaded rod 805 passes through the limiting sleeve 6, so that one end of the rotating rod 806 is threadedly connected to the tibia part 2, and the trolley module 7 is fixed together with the tibia part 2 through the limiting sleeve 6.

[0051] The inner wall size of the groove 801 matches the outer wall size of the slider 802. When the slider 802 slides inside the groove 801, the groove 801 can limit the sliding of the slider 802 and prevent the slider 802 from shaking inside the groove 801.

[0052] like Figure 3 and Figure 4 As shown, the connecting mechanism 4 includes a groove 401, a protrusion 402, a first bolt hole 403, a first screw 404, a second bolt hole 405, and a second screw 406. Two sets of grooves 401 are provided on the surface of the talus 1. The inner wall of the groove 401 is slidably connected to the protrusion 402. The surface of the protrusion 402 is fixedly connected to the talus prosthesis 3. The talus prosthesis 3 is inserted into the groove 401 of the talus 1 through the protrusion 402, so that the talus prosthesis 3 can be locked on the talus 1.

[0053] The talus prosthesis 3 has a first bolt hole 403 on one side and a second bolt hole 405 on the other side. A first screw 404 is slidably connected to the inner wall of the first bolt hole 403, and one end of the first screw 404 engages with the talus 1. A second screw 406 is slidably connected to the inner wall of the second bolt hole 405, and one end of the second screw 406 engages with the talus 1. When the talus prosthesis 3 is connected to the talus 1, the first screw 404 and the second screw 406 are turned. The first screw 404 passes through the first bolt hole 403 and is threadedly connected to the talus 1. The second screw 406 then passes through the second bolt hole 405 and is threadedly connected to the talus 1, so that the talus prosthesis 3 is fixed on the talus 1.

[0054] like Figure 10 As shown, the adjustment mechanism 9 includes a slot 901, a friction block 902, a locking block 903, a tibial prosthesis 904, a third bolt hole 905, a third screw 906, and a connecting groove 907. The top of the tibial component 2 has a slot 901. The locking block 903 is slidably connected inside the slot 901. The friction block 902 is fixedly connected to the inner wall of the slot 901 and the outer wall of the locking block 903. The top of the locking block 903 is fixedly connected to the tibial prosthesis 904. When necrosis occurs in the tibia, the necrosis needs to be removed. According to the length of the removed tibia, the tibial component 2 is extended. The tibial prosthesis 904 is inserted into the slot 901 of the tibial component 2 through the locking block 903, so that the tibial prosthesis 904 can be locked on the tibial component 2. The setting of the friction block 902 makes it difficult for the locking block 903 locked in the slot 901 to fall off.

[0055] The surface of the tibia component 2 is provided with a third bolt hole 905, and a third screw 906 is threaded into the third bolt hole 905. One end of the third screw 906 is engaged with the locking block 903 and the tibia component 2. The top of the tibia prosthesis 904 is provided with a connecting groove 907. When the tibia prosthesis 904 is connected to the tibia component 2, the third screw 906 is turned. The third screw 906 passes through the third bolt hole 905 and is threaded into the locking block 903 and the tibia component 2, so that the tibia prosthesis 904 can be fixed to the tibia component 2 by the locking block 903.

[0056] like Figure 2 , Figure 5 As shown, the top of the talus prosthesis 3 is provided with an arc-shaped convex surface 10, and the bottom of the trochlear module 7 is provided with a sliding pad 11. The arc-shaped convex surface 10 is adapted to the lower surface of the sliding pad 11 to form a smooth joint. The arc-shaped convex surface 10 is used to cooperate with the sliding pad 11 to form a joint surface with a larger area. The larger surface can reduce the wear of the joint surface and ensure the range of motion of the joint surface.

[0057] like Figure 1As shown, the tibial component 2, talus prosthesis 3, trochlear module 7 and tibial prosthesis 904 are made of titanium alloy, which can effectively reduce the risk of metal allergy.

[0058] The working process of the technical solution provided by this invention is as follows:

[0059] In use, this invention first involves an appropriate osteotomy on the talus 1 to match the shape of the talus prosthesis 3 to the individual anatomical shape of the talus surface of the patient. Then, two sets of grooves 401 are made on the surface of the talus 1. Bone cement is applied to the bottom of the talus prosthesis 3, allowing it to be inserted into the grooves 401 of the talus 1 via protrusions 402. The use of bone cement enhances the connection strength between the talus prosthesis 3 and the talus 1, ensuring the talus prosthesis 3 is securely attached to the talus 1. After the talus prosthesis 3 is connected to the talus 1, the first screw 404 and the second screw 406 are tightened. The first screw 404 passes through the first bolt hole 403 and is threaded into the talus 1. The second screw... Screw 406 then passes through the second bolt hole 405 and is threaded into the talus 1, fixing the talus prosthesis 3 onto the talus 1. Depending on the necrosis status of the tibia, if there is no necrosis, a limiting groove 5 is opened at the bottom of the tibia component 2. The trolley module 7 is inserted into the limiting groove 5 through the limiting sleeve 6. The threaded rod 805 is turned, passing through the limiting sleeve 6. When the threaded rod 805 moves to a certain position in the limiting sleeve 6, one end of the threaded rod 805 contacts the rear end of the push block 804, and the rotating rod 806 is inserted into the push block 804. When the threaded rod 805 moves forward, it can push the push block 804 forward. Push block 804 drives inclined block 803 to move outward, causing part of inclined block 803 to protrude from the peripheral wall of limiting sleeve 6 and embed into the tibia, thereby increasing the pull-out resistance of limiting sleeve 6. At the same time, one end of rotating rod 806 is threadedly connected to the tibia, so that trochlear module 7 is more stably fixed in the tibia through limiting sleeve 6. When necrosis occurs in the tibia, the necrosis needs to be removed. According to the length of the removed tibia, the tibia part 2 is extended, and the tibia prosthesis 904 is inserted into the slot 901 opened in the tibia part 2 through locking block 903, so that the tibia prosthesis 904 can be locked on the tibia part 2. Tighten the third screw 906, the third screw 906 passes through the third bolt hole 905 and the locking block. The tibial prosthesis 904 is fixed to the tibial prosthesis 2 by the locking block 903 and the threaded connection between the tibial prosthesis 903 and the tibial component 2. Then, the bottom of the tibia is appropriately osteotomized so that the bottom of the tibia can be inserted into the connecting groove 907. Then, the third screw 906 is turned, and the third screw 906 passes through the third bolt hole 905 and is threaded to the tibia, so that the tibial prosthesis 904 can be fixed to the tibial component 2. At the same time, when the tibial prosthesis 904 is not needed, the tibial component 2 is directly installed at the bottom of the tibia. The arc-shaped convex surface 10 and the sliding pad 11 are used to form a large joint surface. The large surface can reduce the wear of the joint surface and ensure the range of motion of the joint surface.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A talus component for an ankle joint prosthesis, comprising a talus, a tibial component, a talus prosthesis, and a trochlear module, wherein a limiting groove is formed at the bottom of the tibial component, a limiting sleeve is slidably connected to the inner wall of the limiting groove, and a trochlear module is fixedly connected to the bottom of the limiting sleeve; characterized in that, The surface of the talus is provided with a connecting mechanism for fixing the talus prosthesis; The limiting sleeve has a fixing mechanism inside for fixing the trolley module to the tibia part. The fixing mechanism includes a groove, a slider, an inclined block and a push block. The surface of the trolley module has two sets of grooves. The inner walls of the two sets of grooves are slidably connected to sliders. The tops of the two sets of sliders are fixedly connected to inclined blocks. One side surface of the inclined block is provided with a push block. The top of the tibia member is provided with an adjustment mechanism that can lengthen the tibia; The connecting mechanism includes a groove, a protrusion, a first bolt hole, a first screw, a second bolt hole, and a second screw. Two sets of grooves are provided on the surface of the talus. The inner wall of the groove is slidably connected to the protrusion, and the surface of the protrusion is fixedly connected to the talus prosthesis. The adjustment mechanism includes a slot, a friction block, a locking block, a tibial prosthesis, a third bolt hole, a third screw, and a connecting groove. The top of the tibial component has a slot, and a locking block is slidably connected inside the slot. A friction block is fixedly connected to the inner wall of the slot and the outer wall of the locking block, and the top of the locking block is fixedly connected to the tibial prosthesis.

2. The ankle joint prosthesis talus component according to claim 1, characterized in that, One side of each of the two sets of inclined blocks is provided with an inclined surface, and both sides of the push block are provided with inclined surfaces, and the inclined surface of the push block cooperates with the inclined surface of the inclined block.

3. The ankle joint prosthesis talus component according to claim 1, characterized in that, The inner wall of the limiting sleeve is threaded with a threaded rod, one end of which is fixedly connected to a rotating rod. The inside of the push block is slidably connected to a rotating rod, one end of which engages with the tibia piece, and one end of the rotating rod is pointed.

4. The ankle joint prosthesis talus component according to claim 1, characterized in that, The inner wall dimensions of the groove match the outer wall dimensions of the slider.

5. The ankle joint prosthesis talus component according to claim 1, characterized in that, The talus prosthesis has a first bolt hole on one side and a second bolt hole on the other side. A first screw is slidably connected to the inner wall of the first bolt hole, and one end of the first screw engages with the talus. A second screw is slidably connected to the inner wall of the second bolt hole, and one end of the second screw engages with the talus.

6. The ankle joint prosthesis talus component according to claim 1, characterized in that, The surface of the tibia component has a third bolt hole, and the internal thread of the third bolt hole is connected to a third screw. One end of the third screw cooperates with the locking block and the tibia component. The top of the tibia prosthesis has a connecting groove.

7. The ankle joint prosthesis talus component according to claim 1, characterized in that, The top of the talus prosthesis has an arc-shaped convex surface, and the bottom of the trochlear module has a sliding pad. The arc-shaped convex surface and the lower surface of the sliding pad are adapted to form a smooth motion joint.

8. The ankle joint prosthesis talus component according to claim 1, characterized in that, The tibial component, talus prosthesis, trochlear module, and tibial prosthesis are made of titanium alloy.

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