Taxonavicular joint prosthesis

Abstract

The utility model provides a talar-navicular joint prosthesis, which belongs to the technical field of joint prostheses and comprises a talar bone prosthesis, a navicular bone prosthesis and a liner. The talus prosthesis is used for making contact with the talus and provided with a plurality of first positioning columns used for penetrating into the talus. The scaphoid bone prosthesis is used for making contact with the scaphoid bone and provided with a plurality of second positioning columns used for penetrating into the scaphoid bone. The liner is located between the talus prosthesis and the scaphoid prosthesis, and the liner is connected with the scaphoid prosthesis and used for bearing the talus prosthesis. The talonavicular joint prosthesis provided by the utility model can solve the problem that a medical instrument for treating diseases such as rheumatoid arthritis is lacked in the market.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of joint prosthesis, more specifically, relate to a tarsal navicular joint prosthesis. BACKGROUND

[0002] The foot and ankle system is crucial to maintaining the human upright walking state, and the tarsal navicular joint is the highest point of the medial longitudinal arch of the foot, which plays an important role in maintaining the arch of the foot. The destruction of the tarsal navicular joint can cause rheumatoid arthritis, which can cause persistent pain in patients. At present, the treatment of rheumatoid arthritis and other diseases of the tarsal navicular joint adopts tarsal navicular fusion. This treatment method mainly sacrifices the activity of the tarsal navicular joint, which can easily cause the patient to limp after surgery. At present, there is a lack of medical devices for treating rheumatoid arthritis and other diseases on the market to solve the above problems. SUMMARY

[0003] The utility model aims at providing a tarsal navicular joint prosthesis, which aims to solve the problem of the lack of medical devices for treating rheumatoid arthritis and other diseases on the market.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a tarsal navicular joint prosthesis, which comprises a talus prosthesis, a scaphoid prosthesis and a gasket. The talus prosthesis is used for contacting the talus, and the talus prosthesis has a plurality of first positioning columns for penetrating into the talus. The scaphoid prosthesis is used for contacting the scaphoid, and the scaphoid prosthesis has a plurality of second positioning columns for penetrating into the scaphoid. The gasket is located between the talus prosthesis and the scaphoid prosthesis, and the gasket is connected with the scaphoid prosthesis and used for supporting the talus prosthesis.

[0005] In one possible implementation, the tarsal navicular joint prosthesis further comprises locking screws. The locking screws are a plurality of locking screws, which are arranged in the talus prosthesis, and the screw rods of the locking screws are used for threaded connection in the talus.

[0006] In one possible implementation, the talus prosthesis is provided with a stepped hole for the locking screw to pass through at each of the locking screws, and the end of the stepped hole with a larger cross-sectional area is used for accommodating the head of the locking screw.

[0007] In one possible implementation, the gasket is made of polyethylene material.

[0008] In one possible implementation, the side wall of the scaphoid prosthesis is provided with a T-shaped slide, one end of the T-shaped slide is an open end, and the gasket has a T-shaped part which is slidably arranged in the T-shaped slide.

[0009] In a possible implementation, the bottom wall of the T-shaped slide is provided with a first clamping groove, and the gasket is provided with a first clamping portion clamped in the first clamping groove.

[0010] In a possible implementation, the gasket is provided with a second clamping portion slidably arranged in the tarsal bone prosthesis, and the second clamping portion is provided with a clamping head protruding to the side, and the clamping head is clamped in the tarsal bone prosthesis.

[0011] In a possible implementation, the tarsal bone prosthesis is provided with a positioning groove towards the surface of the talus prosthesis, and the gasket is provided with a positioning portion slidably arranged in the positioning groove.

[0012] In a possible implementation, the positioning groove is in a quadrangular prism structure.

[0013] In a possible implementation, the talus prosthesis and the tarsal bone prosthesis are both made of metal.

[0014] In the embodiment of the application, during the operation, the talus and the tarsal bone of the patient are cut, and then the assembly is arranged between the retained talus and tarsal bone of the patient. The talus prosthesis is in contact with the talus, and the first positioning column penetrates into the talus. The tarsal bone prosthesis is in contact with the tarsal bone, and the second positioning column penetrates into the tarsal bone, so that the talus prosthesis and the talus are connected together, and the tarsal bone prosthesis and the tarsal bone are connected together. The gasket supports the talus prosthesis to move, so as to retain the activity of the subtalar joint and the tarsometatarsal joint, and reduce the occurrence of lameness of the patient after the operation. Therefore, the assembly avoids the problem that there is no medical instrument for treating rheumatoid arthritis and other diseases in the market. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0016] Figure 1 A structure schematic view of a talotarsal joint prosthesis provided by the first embodiment of the present application is shown in the figure.

[0017] Figure 2 A structure schematic view of a talotarsal joint prosthesis provided by the first embodiment of the present application is shown in the figure.

[0018] Figure 3 A structure schematic view of a talotarsal joint prosthesis provided by the first embodiment of the present application is shown in the figure. Figure 2

[0019] Figure 4 ​The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0020] Figure 5 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0021] Figure 6 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0022] Figure 7 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0023] Figure 8 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0024] Figure 9 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0025] Figure 10 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0026] Figure 11 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0027] Figure 12 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0028] Figure 13 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model, Figure 12 The utility model provides a structure schematic view of talar prosthesis in a talonavicular joint prosthesis of first embodiment of the utility model,

[0029] Figure: 1, talar prosthesis;11, first positioning column;12, ladder hole;2, talar prosthesis;21, second positioning column;22, T type slide;23, first clamping groove;24, positioning groove;25, second clamping groove;251, recess;3, gasket;31, T type department;32, first clamping part;321, wedge surface;33, second clamping part;331, clamping head;34, positioning part;4, locking screw. Specific implementation

[0030] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer, the utility model will be described in further detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0031] It should be further explained that the drawings and embodiments of the utility model mainly describe and explain the concept of the utility model, and on the basis of the concept, the specific forms and settings of some connection relationships and position relationships may not be completely described, but those skilled in the art can realize the specific forms and settings described above in a well-known manner on the premise of understanding the concept of the utility model.

[0032] The terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0033] The terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, and the meaning of "several" is one or more than one, unless otherwise explicitly specified.

[0034] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 8 , a tarsal joint prosthesis provided by the utility model will be described. The tarsal joint prosthesis comprises a talus prosthesis 1, a scaphoid prosthesis 2 and a gasket 3. The talus prosthesis 1 is used for contacting the talus, and the talus prosthesis 1 has a plurality of first positioning columns 11 for penetrating into the talus. The scaphoid prosthesis 2 is used for contacting the scaphoid, and the scaphoid prosthesis 2 has a plurality of second positioning columns 21 for penetrating into the scaphoid. The gasket 3 is located between the talus prosthesis 1 and the scaphoid prosthesis 2, the gasket 3 is connected with the scaphoid prosthesis 2 and is used for supporting the talus prosthesis 1.

[0035] The utility model provides a kind of talar-cruising joint prosthesis, compared with prior art, during operation, the talus and scaphoid of patient are cut, then the present component is placed between the talus and scaphoid of patient reserved.And talus prosthesis 1 is contacted with talus, and first positioning column 11 is inserted into talus;Scaphoid prosthesis 2 is contacted with scaphoid, and second positioning column 21 is inserted into scaphoid, so that talus prosthesis 1 is connected together with talus, and scaphoid prosthesis 2 is connected together with scaphoid.Liner 3 supports talus prosthesis 1 movement, so as to retain subtalar joint and tarsal articulation activity degree, reduce the occurrence of patient postoperative claudication.So the present component avoids the problem of lack of a kind of medical instrument for treating rheumatoid arthritis and other diseases in market.

[0036] In some embodiments, referring to Figure 1 and Figure 8 , the talar-cruising joint prosthesis further comprises locking screws 4.The locking screws 4 are several, and the locking screws 4 are threaded in the talus prosthesis 1, and the screw rod of the locking screw 4 is used for being screwed in the talus.The connection of the locking screw 4 and the talus guarantees the reliability of the connection of the talus prosthesis 1 and the talus.

[0037] In some embodiments, referring to Figure 1 and Figure 4 , the talus prosthesis 1 is provided with a stepped hole 12 for the locking screw 4 to pass through at each locking screw 4, and the end with larger cross-sectional area of the stepped hole 12 is used for accommodating the head of the locking screw 4.In this way, the head of the locking screw 4 can be prevented from protruding out of the talus prosthesis 1.

[0038] In some embodiments, the liner 3 is made of polyethylene material.Polyethylene belongs to alkane inert polymer, and has good chemical stability.

[0039] In some embodiments, referring to Figure 1 , Figure 6 and Figure 7 , the side wall of the scaphoid prosthesis 2 is provided with a T-shaped slide 22, and the T-shaped slide 22 has an open end, and the liner 3 has a T-shaped part 31 slidingly threaded in the T-shaped slide 22.The T-shaped part 31 and the T-shaped slide 22 are matched to slidingly connect the liner 3 and the scaphoid prosthesis 2 together.

[0040] In some embodiments, referring to Figures 5 to 7, the bottom wall of the T-shaped slide 22 is provided with a first clamping groove 23, and the spacer 3 is provided with a first clamping portion 32 clamped in the first clamping groove 23. When the spacer 3 is connected with the talus prosthesis 2, the T-shaped portion 31 is slid into the T-shaped slide 22 until the first clamping portion 32 is clamped in the first clamping groove 23, and the first clamping groove 23 can limit the sliding of the T-shaped portion 31 out of the T-shaped slide 22. At this time, the T-shaped portion 31 abuts against the closed end of the T-shaped slide 22 to fully limit the sliding of the T-shaped portion 31. In this embodiment, when the T-shaped portion 31 is slid into the T-shaped slide 22, the first clamping portion 32 is clamped in the first clamping groove 23 by the elastic deformation of the spacer 3. The T-shaped portion 31 is provided with a wedge surface 321, and when the T-shaped portion 31 is slid into the T-shaped slide 22, the spacer 3 is gradually deformed by the contact between the wedge surface 321 and the talus prosthesis 2, and the spacer 3 returns to the original shape after the first clamping portion 32 is clamped in the first clamping groove 23.

[0041] In some embodiments, referring to Figures 8 to 13 , the spacer 3 is provided with a second clamping portion 33 clamped in the talus prosthesis 2, and the second clamping portion 33 is provided with a clamping head 331 protruding to the side, and the clamping head 331 is clamped in the talus prosthesis 2 to clamp the spacer 3 and the talus prosthesis 2 together. In this embodiment, the talus prosthesis 2 is provided with a second clamping groove 25 on the surface facing the talus prosthesis 1, and the bottom of the second clamping groove 25 is provided with a recessed portion 251 recessed to the side, and the clamping head 331 is clamped in the recessed portion 251.

[0042] Further, in order to ensure the reliability of the connection between the spacer 3 and the talus prosthesis 2, the second clamping portion 33 and the second clamping groove 25 are provided with at least two groups.

[0043] In some embodiments, referring to Figure 8 , Figure 9 , Figure 10 and Figure 12 , the talus prosthesis 2 is provided with a positioning groove 24 on the surface facing the talus prosthesis 1, and the spacer 3 is provided with a positioning portion 34 slidably clamped in the positioning groove 24. After the assembly is applied in the patient's body, the transverse stress of the second clamping portion 33 can be reduced by the cooperation between the positioning groove 24 and the positioning portion 34, so as to avoid the breakage of the second clamping portion 33.

[0044] In some embodiments, referring to Figure 10 , the positioning groove 24 is in a quadrangular prism structure. In this way, the rotation between the spacer 3 and the talus prosthesis 2 can be limited, and the second clamping portion 33 can be prevented from being twisted and broken.

[0045] In some embodiments, the talus prosthesis 1 and the talus prosthesis 2 are both made of metal, so as to ensure the strength of the talus prosthesis 1 and the talus prosthesis 2.

[0046] Further, the contact surface of the talus prosthesis 1 with the talus and the contact surface of the scaphoid prosthesis 2 with the scaphoid can be provided with a titanium spray treatment.

[0047] The contact surface of the talus prosthesis 1 with the talus can be provided with a trabecular structure, thereby enhancing the stability of the talus prosthesis 1.

[0048] The above merely provides the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall fall within the protection scope of the present application.

Claims

1. A talonavicular joint prosthesis, characterized in that: include: a talar prosthesis, configured to contact the talus, the talar prosthesis comprising a plurality of first positioning posts configured to penetrate into the talus; A scaphoid prosthesis is used to contact the scaphoid bone, and the scaphoid prosthesis has a plurality of second positioning posts for penetrating into the scaphoid bone; as well as A liner is located between the talar prosthesis and the scaphoid prosthesis. The liner is connected to the scaphoid prosthesis and is used to support the talar prosthesis.

2. The talonavicular joint prosthesis according to claim 1, characterized in that: Also includes: There are a plurality of locking screws, each of which is passed through the talar prosthesis, and the screw rod of the locking screw is used for being threadedly connected in the talus.

3. The talonavicular joint prosthesis according to claim 2, characterized in that: The talar prosthesis is provided with a stepped hole for the locking screw to pass through at a position corresponding to each locking screw, and the end of the stepped hole with a larger cross-sectional area is used to accommodate the head of the locking screw.

4. The talonavicular joint prosthesis according to claim 1, characterized in that: The liner is made of polyethylene.

5. The talonavicular joint prosthesis according to claim 4, characterized in that: A T-shaped slide is provided on the side wall of the navicular prosthesis. One end of the T-shaped slide is open. The liner has a T-shaped portion that is slidably arranged in the T-shaped slide.

6. The talonavicular joint prosthesis according to claim 5, characterized in that: The bottom wall of the T-shaped slideway is provided with a first clamping groove, and the liner has a first clamping portion clamped in the first clamping groove.

7. The talonavicular joint prosthesis according to claim 6, characterized in that: The liner has a second clamping portion which is inserted into the scaphoid prosthesis. The second clamping portion has a clamping joint which protrudes to the side. The clamping joint is clamped into the scaphoid prosthesis.

8. The talonavicular joint prosthesis according to claim 7, characterized in that: A positioning groove is provided on the surface of the navicular prosthesis facing the talar prosthesis, and the liner has a positioning portion that is slidably arranged in the positioning groove.

9. The talonavicular joint prosthesis according to claim 8, characterized in that: The positioning groove is in a quadrangular prism structure.

10. The talonavicular joint prosthesis according to claim 1, characterized in that: The talar prosthesis and the scaphoid prosthesis are both made of metal.

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