Ankle joint prosthesis talus assembly

Abstract

The invention provides an ankle joint prosthesis talus assembly, and belongs to the field of medical equipment. Comprising a talus, a tibia piece, a talus prosthesis and a pulley module, a connecting mechanism for fixing the talus prosthesis is arranged on the surface of the talus; a fixing mechanism used for fixing the tackle module to the tibia piece or the tibia of the human body is arranged in the limiting sleeve. The fixing mechanism is arranged, the limiting groove is formed in the bottom of the tibia, the pulley module is inserted into the limiting groove through the limiting sleeve, the threaded rod is screwed, when the threaded rod moves forwards, the threaded rod can push the push block to move forwards, meanwhile, the push block drives the inclined block to move outwards, and the inclined block partially protrudes out of the peripheral wall of the limiting sleeve and is embedded into the tibia; meanwhile, one end of the rotating rod is in threaded connection with the tibia, so that the tackle module is more stably fixed in the tibia through the limiting sleeve, and then the phenomenon that the tackle module is loosened after being implanted is reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly to a talar component of an ankle prosthesis. Background Art

[0002] The talus, distal tibia, and lower end of the fibula together form the ankle joint, which 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 arthritis can cause loss of ankle function and ankle deformity, seriously affecting the patient's daily life and work. With the deepening of understanding of ankle anatomy and biomechanics, and the improvement of materials and manufacturing technology, ankle prosthesis replacement has shown good clinical effects and safety, and is increasingly accepted by patients. Artificial ankle replacement is an effective clinical treatment for ankle injuries caused by trauma or disease, and the artificial ankle joint consists of a tibial component, a talar component, and a liner. Common liner materials are polymers or metals, and the talar component material is metal, ceramic, or polymer material. The talar component contacts the liner to form a pair of friction pairs;

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

[0004] Aiming at the problem that the blanking device in the prior art cannot be adjusted according to the blanking needs of steel bars of different length specifications and can only blank steel bars of fixed length, the purpose of the present invention is to provide an ankle prosthesis talus component.

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

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

[0007] The interior of the limiting sleeve is provided with a fixing mechanism for fixing the pulley module on the tibial component or the human tibia, and the fixing mechanism includes a slide groove, a slider, an inclined block and a push block. The pulley module is avoided by opening two groups of slide grooves, and the inner walls of the two groups of the slide grooves are slidably connected with sliders, and the tops of the two groups of the sliders are fixedly connected with inclined blocks, and a push block is provided on one side surface of the inclined block.

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

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

[0010] Optionally, the inner wall of the limiting sleeve is threadedly connected to a threaded rod, one end of the threaded rod is fixedly connected to a rotating rod, the interior of the push block is slidably connected to the rotating rod, one end of the rotating rod cooperates with the tibial component, and one end of the rotating rod is pointed.

[0011] Optionally, the inner wall size of the sliding groove matches the outer wall size of the sliding block.

[0012] Optionally, the connecting mechanism includes a convex groove, a protrusion, a first bolt hole, a first screw, a second bolt hole, and a second screw. Two groups of convex grooves are opened on the surface of the talus. The inner wall of the convex groove is slidably connected with a protrusion, and the surface of the protrusion is fixedly connected to the talar prosthesis.

[0013] Optionally, a first bolt hole is provided on one side of the surface of the talar 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 cooperates 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 cooperates with the talus.

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

[0015] Optionally, a third bolt hole is provided on the surface of the tibial component, a third screw is connected to the internal thread of the third bolt hole, one end of the third screw cooperates with the block and the tibial component, and a connecting groove is provided on the top of the tibial prosthesis.

[0016] Optionally, the top of the talar prosthesis is provided with an arc-shaped convex surface, and the bottom of the pulley module is provided with a sliding pad, and the arc-shaped convex surface is adapted to the lower surface of the sliding pad to form a smooth motion joint.

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

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

[0019] In the above scheme, by setting up a connecting mechanism, two sets of grooves are opened on the surface of the talus, and bone cement is applied to the bottom of the talar prosthesis, so that the talar prosthesis is inserted into the groove opened on the talus through the protrusion. By using bone cement, the connection strength between the talar prosthesis and the talus can be enhanced, so that the talar prosthesis can be stuck on the talus. By screwing the first screw and the second screw and the talus, the talar prosthesis is stably fixed on the talus, thereby reducing the loosening of the talar prosthesis after implantation.

[0020] By setting a fixing mechanism, a limiting groove is opened at the bottom of the tibia, the pulley module is inserted into the limiting groove through the limiting sleeve, and the threaded rod is twisted, 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 again, the push block can be pushed forward by the threaded rod, and at the same time, the push block drives the oblique block to move outward, so that the oblique block part protrudes from the peripheral wall of the limiting sleeve and is embedded in the tibia, thereby increasing the pull-out resistance of the limiting sleeve. At the same time, one end of the rotating rod is threadedly connected to the tibia, so that the pulley module is more stably fixed in the tibia through the limiting sleeve, thereby reducing the loosening phenomenon after the pulley module is implanted.

[0021] By setting up an adjustment mechanism, when necrosis occurs in the tibia, the necrosis needs to be removed, and the tibial component is extended according to the length of the resected tibia. The tibial prosthesis is inserted into the slot provided in the tibial component through the clamping block so that the tibial prosthesis can be stuck on the tibial component, and then the tibial prosthesis is fixed by the third screw so that the tibial component can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make 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 talar prosthesis in cooperation with each other according to the present invention;

[0025] Figure 3 It is a structural schematic diagram of the connecting mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the convex groove and the convex block matching the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the limiting groove and the limiting sleeve in cooperation with each other in the present invention;

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

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

[0030] Figure 8 This is a schematic diagram of the structure of the matching between the limit sleeve and the pulley module of the present invention;

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

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

[0033] [Reference Signs]

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

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

[0036] 5. Limit groove; 6. Limit sleeve; 7. Pulley module;

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

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

[0039] 10. Arc-shaped convex surface; 11. Sliding pad.

[0040] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative methods for implementing certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0042] It should be noted that references to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes such specific features, structures, or characteristics. In addition, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not such features, structures, or characteristics are explicitly described).

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

[0044] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0045] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0046] like Figures 1 to 10 As shown, an embodiment of the present invention provides an ankle joint prosthesis talar assembly, comprising a talus 1, a tibial component 2, a talar prosthesis 3, and a pulley module 7. A limiting groove 5 is provided at the bottom of the tibial component 2, and a limiting sleeve 6 is slidably connected to the inner wall of the limiting groove 5. The bottom of the limiting sleeve 6 is fixedly connected to the pulley module 7, so that the pulley module 7 can be inserted into the limiting groove 5 through the limiting sleeve 6. It is characterized in that a connecting mechanism 4 for fixing the talar prosthesis 3 is provided on the surface of the talus 1, so that the fixation between the talus 1 and the talar prosthesis 3 is more stable.

[0047] The interior of the limiting sleeve 6 is provided with a fixing mechanism 8 for fixing the pulley module to the tibial component 2 or the human tibia. The fixing mechanism 8 includes a slide groove 801, a slider 802, an inclined block 803 and a push block 804. The surface of the pulley module 7 is provided with two groups of slide grooves 801. The inner walls of the two groups of slide grooves 801 are slidably connected to the sliders 802 so that the sliders 802 can slide in the slide grooves 801. The tops of the two groups of sliders 802 are fixedly connected to the inclined blocks 803. A push block 804 is provided on one side surface of the inclined block 803.

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

[0049] It also includes that one side of the two groups of inclined blocks 803 is provided with an inclined surface, and both sides of the push block 804 are provided with an inclined surface. The inclined surfaces of the push block 804 cooperate with the inclined surfaces 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 threadedly connected with a threaded rod 805, one end of the threaded rod 805 is fixedly connected with a rotating rod 806, the interior of the push block 804 is slidably connected with the rotating rod 806, one end of the rotating rod 806 cooperates with the tibial component 2, and one end of the rotating rod 806 is pointed, which is convenient for the rotating rod 806 to be threadedly connected to the tibial component 2. By twisting the threaded rod 805, the threaded rod 805 passes through the limiting sleeve 6, so that one end of the rotating rod 806 is threadedly connected to the tibial component 2, so that the pulley module 7 is fixed to the tibial component 2 through the limiting sleeve 6.

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

[0052] like Figure 3 and Figure 4 As shown, the connecting mechanism 4 includes a convex 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 groups of convex grooves 401 are provided on the surface of the talus 1. The inner wall of the convex groove 401 is slidably connected with a protrusion 402. The surface of the protrusion 402 is fixedly connected with the talar prosthesis 3. The talar prosthesis 3 is inserted into the convex groove 401 provided on the talus 1 through the protrusion 402, so that the talar prosthesis 3 can be stuck on the talus 1.

[0053] A first bolt hole 403 is formed on one side of the surface of the talar prosthesis 3, and a second bolt hole 405 is formed 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 is matched 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 is matched with the talus 1. When the talar prosthesis 3 is connected to the talus 1, the first screw 404 and the second screw 406 are screwed, and 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 talar prosthesis 3 is fixed to the talus 1;

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

[0055] A third bolt hole 905 is provided on the surface of the tibial component 2, and a third screw 906 is connected to the internal thread of the third bolt hole 905. One end of the third screw 906 cooperates with the block 903 and the tibial component 2. A connecting groove 907 is provided on the top of the tibial prosthesis 904. When the tibial prosthesis 904 is connected to the tibial component 2, the third screw 906 is screwed, and the third screw 906 passes through the third bolt hole 905 and is threadedly connected to the block 903 and the tibial component 2, so that the tibial prosthesis 904 can be fixed on the tibial component 2 through the block 903.

[0056] like Figure 2 、 Figure 5 As shown, the top of the talar prosthesis 3 is provided with an arc-shaped convex surface 10, and the bottom of the pulley 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 motion 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, talar prosthesis 3, pulley 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 the present invention is as follows:

[0059] When the present invention is used, first, an appropriate osteotomy is performed on the talus 1 to match the shape of the talar prosthesis 3 with the anatomical shape of the patient's individual talar surface. Then, two sets of convex grooves 401 are opened on the surface of the talus 1, and bone cement is applied to the bottom of the talar prosthesis 3 so that the talar prosthesis 3 is inserted into the convex grooves 401 opened on the talus 1 through the convex blocks 402. By using bone cement, the connection strength between the talar prosthesis 3 and the talus 1 can be enhanced so that the talar prosthesis 3 can be stuck on the talus 1. After the talar prosthesis 3 and the talus 1 are connected together, the first screw 404 and the second screw 406 are screwed. The first screw 404 passes through the first bolt hole 403 and is threadedly connected to the talus 1, and the second screw 406 is screwed. The 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 to the talus 1. According to the necrosis of the tibia, when there is no necrosis at the tibia, a limiting groove 5 is opened at the bottom of the tibial component 2, and the pulley module 7 is inserted into the limiting groove 5 through the limiting sleeve 6. The threaded rod 805 is twisted, and the threaded rod 805 passes 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 again, the push block 804 can be pushed forward by the threaded rod 805, and at the same time The push block 804 drives the inclined block 803 to move outward, so that the inclined block 803 partially protrudes from the peripheral wall of the limiting sleeve 6 and is embedded in the tibia, thereby increasing the pull-out resistance of the limiting sleeve 6. At the same time, one end of the rotating rod 806 is connected to the tibia thread, so that the pulley module 7 is more stably fixed in the tibia through the limiting sleeve 6. When necrosis occurs at the tibia, the necrosis needs to be removed. According to the length of the resected tibia, the tibial component 2 is extended, and the tibial prosthesis 904 is inserted into the slot 901 provided in the tibial component 2 through the clamping block 903, so that the tibial prosthesis 904 can be clamped on the tibial component 2, and the third screw 906 is turned. The third screw 906 passes through the third bolt hole 905 and the clamping block 903 is threadedly connected to the tibial component 2, so that the tibial prosthesis 904 can be fixed to the tibial component 2 through the block 903, and then an appropriate osteotomy operation is performed on the bottom of the tibia so that the bottom of the tibia can be inserted into the connecting groove 907, and then the third screw 906 is screwed. The third screw 906 passes through the third bolt hole 905 and is threadedly connected 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 on the bottom of the tibia, and the arc-shaped convex surface 10 and the sliding pad 11 are used to form a larger articular surface. The larger surface can reduce the wear of the articular surface and ensure the range of motion of the articular surface.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A talar assembly of an ankle prosthesis, comprising a talus, a tibial component, a talar prosthesis, and a pulley module, wherein a limiting groove is defined at the bottom of the tibial component, a limiting sleeve is slidably connected to the inner wall of the limiting groove, and the pulley module is fixedly connected to the bottom of the limiting sleeve; characterized in that: The surface of the talus is provided with a connection mechanism for fixing the talar prosthesis; The interior of the limiting sleeve is provided with a fixing mechanism for fixing the pulley module to the tibial component, the fixing mechanism includes a slide groove, a slider, an inclined block and a push block, the surface of the pulley module is provided with two groups of slide grooves, the inner walls of the two groups of slide grooves are slidably connected to the sliders, the tops of the two groups of sliders are fixedly connected to the inclined blocks, and one side surface of the inclined block is provided with a push block; The top of the tibia is provided with an adjustment mechanism that can extend the tibia.

2. The ankle prosthesis talus component according to claim 1, wherein: One side of the two groups of inclined blocks is provided with an inclined surface, and both sides of the push block are provided with inclined surfaces, and the inclined surfaces of the push block match the inclined surfaces of the inclined block.

3. The talar component of the ankle prosthesis according to claim 1, wherein: The inner wall of the limiting sleeve is threadedly connected to a threaded rod, one end of the threaded rod is fixedly connected to a rotating rod, the interior of the push block is slidably connected to the rotating rod, one end of the rotating rod cooperates with the tibial component, and one end of the rotating rod is pointed.

4. The talar component of the ankle prosthesis according to claim 1, wherein: The inner wall size of the sliding groove is consistent with the outer wall size of the sliding block.

5. The talar component of the ankle prosthesis according to claim 1, wherein: The connecting mechanism includes a convex groove, a convex block, a first bolt hole, a first screw, a second bolt hole, and a second screw. Two groups of convex grooves are opened on the surface of the talus. The inner wall of the convex groove is slidably connected with a convex block, and the surface of the convex block is fixedly connected to the talar prosthesis.

6. The talar component of the ankle prosthesis according to claim 1, wherein: A first bolt hole is provided on one side of the surface of the talar 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 cooperates 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 cooperates with the talus.

7. The talar component of the ankle prosthesis according to claim 1, wherein: The adjustment mechanism includes a slot, a friction block, a block, a tibial prosthesis, a third bolt hole, a third screw and a connecting slot. A slot is provided on the top of the tibial component, a block is slidably connected to the inside of the slot, a friction block is fixedly connected to the inner wall of the slot and the outer wall of the block, and the top of the block is fixedly connected to the tibial prosthesis.

8. The talar component of the ankle prosthesis according to claim 1, wherein: A third bolt hole is provided on the surface of the tibial component. A third screw is connected to the inner thread of the third bolt hole. One end of the third screw cooperates with the clamping block and the tibial component. A connecting groove is provided on the top of the tibial prosthesis.

9. The talar component of the ankle prosthesis according to claim 1, wherein: The top of the talar prosthesis is provided with an arc-shaped convex surface, and the bottom of the pulley module is provided with a sliding pad. The arc-shaped convex surface is adapted to the lower surface of the sliding pad to form a smooth motion joint.

10. The talar component of the ankle prosthesis according to claim 1, wherein: The tibial component, talar prosthesis, pulley module and tibial prosthesis are made of titanium alloy.

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