Anti-dislocation ankle tibial prosthetic assembly

Abstract

The application provides an anti-dislocation ankle joint tibial prosthesis assembly, and belongs to the technical field of orthopedic medical instruments. The anti-dislocation ankle joint tibial prosthesis assembly comprises an ankle joint tibial prosthesis assembly and an auxiliary positioning assembly used for assisting in installation of the ankle joint tibial prosthesis assembly. The ankle joint tibial prosthesis assembly comprises a tibial tray, an embedded part and a chamfered cutting talus part. The embedded part is located between the tibial tray and the chamfered cutting talus part. The tibial tray and the bottom side outer wall of the chamfered cutting talus part are symmetrically provided with installation columns used for installation of tibia and talus. Each installation column is internally provided with an anti-dislocation limiting part. The embedded part and the chamfered cutting talus part are provided with an anti-dislocation self-resetting structure near the outer edge. The hollow installation column cooperates with the innovative design of the expansion limiting part, and is combined with a nickel-titanium memory alloy material, so that the prosthesis fixing stability is significantly improved. The unique self-resetting structure can effectively prevent dislocation, reduce the need for secondary surgery, and improve the postoperative life quality of patients.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of orthopedic medical devices, more particularly to a dislocation-preventing ankle joint tibial prosthesis assembly. BACKGROUND

[0002] The ankle joint is composed of the lower end of the tibia, the lower end of the fibula and the talus. The medial malleolus on the medial side of the lower end of the tibia, the lateral malleolus on the lateral side of the lower end of the fibula and the posterior malleolus on the posterior side of the lower end of the tibia together form a forked structure, tightly sandwiching the talus in the middle, thus forming the bony structure of the ankle joint and providing basic stability for the joint.

[0003] When the ankle joint of the human body is damaged, diseased, hyperplastic, has a tumor or a congenital deformity, long-term pain and life activity disorders will occur, and the ankle joint needs to be replaced to improve the function and improve the quality of life by means of an ankle joint prosthesis.

[0004] The current ankle joint tibial prosthesis mainly includes a tibial tray, an embedded piece and a chamfered and cut talus assembly. During installation of the ankle joint tibial prosthesis, an auxiliary frame is first fixed to the tibia of the ankle joint under X-ray imaging, a fixing pin is installed under the assistance of the auxiliary frame, a cutting auxiliary frame is installed on the fixing pin, a cutting position pre-attached to the cutting auxiliary frame is cut by a cutting device (part of the tibia and part of the talus are cut), the cutting auxiliary frame is removed after cutting, a tibial auxiliary frame is installed inside the cutting groove and fixed pins are punched, a hole is opened in the tibial cutting groove, the embedded piece is installed and tested, the tibial auxiliary frame is removed, the talus surface is trimmed, holes are punched in the talus surface, finally, the tibial tray is installed in the tibial groove and the chamfered and cut talus assembly is installed in the talus groove, and the embedded piece is finally installed to complete the installation.

[0005] During installation of the ankle joint tibial prosthesis, holes are obliquely punched in the bone surface inside the tibial groove and the talus groove after cutting, and the fixing columns on the tibial tray and the talus assembly are respectively punched into the bone surface groove of the tibia and the talus. Since the fixing columns on the tibial tray and the talus assembly are respectively cylindrical structures, the ankle joint tibial prosthesis is prone to dislocation. Moreover, the embedded piece of the existing ankle joint tibial prosthesis and the parallelly cut talus assembly are smooth sliding contact surfaces. After the ankle joint tibial prosthesis is installed and used, the user will be prone to outwardly turning the ankle when walking on an irregular road surface. After the ankle is turned outwardly, the embedded piece is difficult to be reset to the initial position, which further reduces the stability of the joint, causes pain and limited activity, accelerates the wear of the prosthesis, and requires secondary surgery adjustment or replacement of the prosthesis, which brings more pain and economic burden to the patient. SUMMARY

[0006] In view of the problem that the existing ankle tibial prosthesis is prone to dislocation and the tibial tray is difficult to reset to the chamfered cutting talar piece when installed and used, the present application aims to provide an anti-dislocation ankle tibial prosthesis assembly.

[0007] To solve the above problems, the present application adopts the following technical solution.

[0008] The anti-dislocation ankle tibial prosthesis assembly comprises an ankle tibial prosthesis assembly and an auxiliary positioning assembly for assisting the installation of the ankle tibial prosthesis assembly, the ankle tibial prosthesis assembly comprises a tibial tray, an embedded piece and a chamfered cutting talar piece, the embedded piece is located between the tibial tray and the chamfered cutting talar piece, the tibial tray and the bottom side outer wall of the chamfered cutting talar piece are symmetrically provided with installation columns for installing the tibia and the talus, each installation column is internally provided with an anti-dislocation limiting piece, and the embedded piece and the chamfered cutting talar piece are provided with an anti-dislocation self-resetting structure on the outer edge close to each other.

[0009] The tibial tray is provided with an installation embedded groove on the side away from the installation column, and the embedded piece is provided with an embedded block on the outer wall of one side, which is matched and connected with the installation embedded groove.

[0010] Optionally, the installation column is provided in a hollow structure with two open sides, expansion structure grooves are symmetrically formed on the outer walls of both sides of one end of the installation column, an inner circumferential thread is arranged on the middle circumferential wall in the installation column, and the end of the installation column away from the expansion structure grooves is connected with the tibial tray and the chamfered cutting talar piece.

[0011] Optionally, the anti-dislocation limiting piece comprises an anti-dislocation column, an outer circumferential thread is arranged on the outer circumferential wall of the anti-dislocation column, which is threadedly connected with the inner circumferential thread of the inner wall of the installation column, an internal hexagonal groove is formed at one end of the anti-dislocation column, an expansion head is connected and arranged at the end of the anti-dislocation column away from the internal hexagonal groove, the expansion head is provided in a pear-shaped structure, and the diameter of the expansion head is less than or equal to the diameter of the installation column.

[0012] Optionally, the material of the installation column is a nickel-titanium-based memory alloy.

[0013] Optionally, the self-resetting structure comprises a self-resetting column and a reset guide groove, the self-resetting column is installed on the outer edge of one side of the embedded piece close to the chamfered cutting talar piece, the reset guide groove is provided in a T-shaped structure, the reset guide groove is formed on the outer edge of the chamfered cutting talar piece on one side of the embedded piece, the self-resetting column is movably located in the reset guide groove, and the structure of the reset guide groove is matched with the structure of the chamfered cutting talar piece.

[0014] Optionally, the auxiliary positioning assembly comprises a fixing member and a positioning member for fixing the lower limbs of the human body, the fixing member comprises a fixing ring for fixing and supporting the thighs and shanks of the human body, the fixing ring is in a semicircular structure, adjusting through holes are uniformly and through formed on the fixing ring, two fixing rings are connected through connecting rods, each connecting rod is provided with a rotating adjusting seat, a limiting rod for limiting the legs of the human body is movably and through arranged in each rotating adjusting seat, and limiting screws for fastening the limiting rods are threadedly arranged on the rotating adjusting seats.

[0015] Optionally, the positioning member comprises a positioning plate, the positioning plate is perpendicular to the connecting rod, one end of the positioning plate is slidably connected to the side of the connecting rod away from the fixing ring through a sliding seat, the sliding seat is connected with the connecting rod through a fastening bolt, a bone needle positioning hole for positioning a bone needle is through formed on the positioning plate, and a positioning bone needle is arranged in the bone needle positioning hole and matched with a mounting through hole on an external tibial cutting member.

[0016] Optionally, a fixing plate is arranged on the top of the side of the tibial tray close to the mounting column, and a fixing hole matched with the positioning bone needle is through formed on the fixing plate.

[0017] Optionally, biocompatible coating layers are arranged on the contact surfaces of the tibial tray, the embedding member and the chamfered cutting talus member.

[0018] Optionally, a pressure sensing layer is arranged on the inner circumferential wall of the fixing ring, and the pressure sensing layer is electrically connected with an external display device through a wire.

[0019] Compared with the prior art, the technical scheme provided by the application has at least the following beneficial effects:

[0020] In the above scheme, the mounting column adopts a hollow structure and is provided with an expansion structure groove, is internally provided with an anti-dislocation limiting member, and through rotating the anti-dislocation column, the pear-shaped expansion head can expand the end of the mounting column, tightly abuts the bone surface, effectively enhances the connection stability of the prosthesis and the bone, reduces the dislocation risk caused by the conventional cylindrical fixing column, the mounting column adopts a nickel-titanium based memory alloy, the nickel-titanium based memory alloy has a shape memory effect and super elasticity, can better adapt to the body temperature and bone mechanical environment of the human body after being implanted into the human body, further improves the fixing effect, and reduces loosening and dislocation caused by stress changes.

[0021] The outer edge of the embedded piece and the chamfered cutting talus piece is provided with a self-resetting structure composed of a self-resetting column and a T-shaped reset guide groove. When the ankle is sprained outwardly, the self-resetting column can move in the reset guide groove and reset, so that the embedded piece returns to the initial position, reduces the risk of dislocation, maintains the stability of the joint, and reduces the pain, limited activity and prosthesis wear caused by dislocation.

[0022] The auxiliary positioning assembly includes a fixing piece and a positioning piece. The fixing piece can firmly fix the lower limbs of the human body. The positioning plate of the positioning piece is connected with the connecting rod through the sliding seat, and can be flexibly adjusted in position. The positioning bone needle is matched with the fixing hole on the external tibial cutting piece and the tibial tray, which can ensure the accurate installation position of the prosthesis and improve the success rate of the operation. The bone needle positioning hole is formed through the positioning plate in the positioning piece. The positioning bone needle inside is matched with the mounting through hole on the external tibial cutting piece. The fixing plate on the tibial tray is provided with a fixing hole matched with the position of the positioning bone needle. This can more accurately position the tibial tray during installation, improve the installation precision, reduce the misplacement of the joint prosthesis, and reduce the wear problem.

[0023] The contact surfaces of the tibial tray, the embedded piece and the chamfered cutting talus piece are provided with a biocompatible coating. The biocompatible coating can not only promote the combination of bone tissue and the prosthesis, enhance the fixing effect, but also reduce friction, reduce wear and prolong the service life of the prosthesis.

[0024] The pressure sensing layer on the inner circumferential wall of the fixing ring is electrically connected with the external display device. Medical staff can monitor the pressure of the fixing ring on the leg of the human body in real time, and adjust the fixing force in time to avoid damage to the patient's leg due to improper pressure, and improve the comfort of the patient.

[0025] Various anti-dislocation and stability designs can effectively reduce the possibility of dislocation and loosening of the ankle joint tibial prosthesis, reduce the need for secondary surgery adjustment or replacement of the prosthesis due to joint problems, and reduce the pain of the patient. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the application and, together with the description, further serve to explain the principles of the application and to enable a person skilled in the relevant art to implement and use the application.

[0027] Figure 1 is a perspective view of the three-dimensional structure of the present application;

[0028] Figure 2 is a split view of the overall ankle joint tibial prosthesis assembly of the present application;

[0029] Figure 3 is a schematic view of the mounting column structure of the present application;

[0030] Figure 4 It is a schematic structural diagram of the anti-dislocation limiter of the present invention;

[0031] Figure 5 A schematic diagram of the self-resetting structure between the insert and the chamfered talar member of the present invention;

[0032] Figure 6 This is a schematic diagram of the self-resetting column of the present invention inside the reset guide groove;

[0033] Figure 7 A side view of the integral ankle-tibial prosthesis component of the present invention;

[0034] Figure 8 This is a schematic structural diagram of the overall auxiliary positioning assembly of the present invention;

[0035] Figure 9 This is a side view of a positioning plate with an external opening installed on the positioning bone pin of the present invention.

[0036] [Reference Signs]

[0037] 1. Ankle tibial prosthesis component;

[0038] 11. Tibial tray; 111. Mounting slot; 112. Fixing plate; 113. Fixing hole;

[0039] 12. Embedded piece; 121. Embedded block;

[0040] 13. Chamfer cutting of talus components;

[0041] 14. Mounting column; 141. Expansion structure groove; 142. Internal circumferential thread;

[0042] 15. Anti-dislocation limiter; 151. Anti-dislocation column; 152. External circumferential thread; 153. Internal hexagonal groove; 154. Expansion head;

[0043] 16. Self-resetting column; 161. Resetting guide groove;

[0044] 2. Auxiliary positioning components;

[0045] 21. Fixing member; 211. Fixing ring; 212. Adjustment hole; 213. Connecting rod; 214. Rotation adjustment seat; 215. Limit rod; 216. Limit screw;

[0046] 22. Positioning member; 221. Positioning plate; 222. Sliding seat; 223. Bone needle positioning hole; 224. Positioning bone needle.

[0047] 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

[0048] 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.

[0049] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, 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 explicitly described).

[0050] 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.

[0051] 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.

[0052] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0053] As Figures 1 to 9 The present application provides a dislocation prevention ankle tibial prosthesis assembly, which comprises an ankle tibial prosthesis assembly 1 and an auxiliary positioning assembly 2 for assisting the installation of the ankle tibial prosthesis assembly 1. The auxiliary positioning assembly 2 is used for positioning and fixing the limb, preventing the limb from moving during the operation, causing inaccurate cutting or damaging the surrounding tissue, thereby ensuring the accuracy and safety of the operation. The ankle tibial prosthesis assembly 1 comprises a tibial tray 11, an embedded part 12 and a chamfered cutting talus part 13. The embedded part 12 is located between the tibial tray 11 and the chamfered cutting talus part 13, and plays a connecting and stabilizing role. The bottom of the tibial tray 11 is provided with an installation embedded groove 111. The outer wall of one side of the embedded part 12 is provided with an embedded block 121 matched and connected with the installation embedded groove 111. The embedded block 121 is embedded into the installation embedded groove 111 through precise fitting, ensuring the stability of the overall structure of the prosthesis assembly, reducing the risk of postoperative loosening, improving the rehabilitation effect of patients, and the contact surfaces of the tibial tray 11, the embedded part 12 and the chamfered cutting talus part 13 are provided with a biocompatible coating, which not only promotes the combination of bone tissue and prosthesis, enhances the fixing effect, but also reduces friction, reduces wear and tear, and prolongs the service life of the prosthesis.

[0054] The tibial tray 11 and the chamfered cutout for the talus piece 13 are symmetrically provided with mounting columns 14 on the outer walls of the middle side for mounting with the tibia and talus, the mounting columns 14 are made of nickel-titanium-based memory alloy, effectively improving the stability and durability of the prosthesis assembly, suitable for complex surgical environment, the nickel-titanium-based memory alloy has shape memory characteristics, which can automatically restore the preset shape at body temperature, ensuring firm installation, each mounting column 14 is provided with an anti-dislocation limiting piece 15 inside, which limits the mounting column 14 to prevent it from sliding out of the installation groove on the bone surface, causing dislocation, the mounting column 14 is provided in a hollow structure with two open sides, which facilitates the installation and adjustment of the anti-dislocation limiting piece 15, the anti-dislocation limiting piece 15 is made of high-strength medical material and has excellent biocompatibility, which can effectively prevent prosthesis displacement and improve the success rate of surgery, the two outer walls of one end of the mounting column 14 are symmetrically provided with expansion structure grooves 141, and the inner circumferential wall of the mounting column 14 is provided with an inner circumferential thread 142, the end of the mounting column 14 away from the expansion structure groove 141 is connected with the tibial tray 11 and the chamfered cutout for the talus piece 13, the through connection facilitates fine adjustment of the anti-dislocation limiting piece 15 inside the mounting column 14, ensures its stability during the operation, further improves the fit of the prosthesis and the bone, reduces postoperative complications, the anti-dislocation limiting piece 15 comprises an anti-dislocation column 151, the outer circumferential wall of the anti-dislocation column 151 is provided with an outer circumferential thread 152 which is threadedly connected with the inner circumferential thread 142 of the inner wall of the mounting column 14, one end of the anti-dislocation column 151 is provided with an internal hexagonal groove 153, the end of the anti-dislocation column 151 away from the internal hexagonal groove 153 is connected with an expansion head 154, the expansion head 154 is provided in a pear-shaped structure, the diameter of the expansion head 154 is less than or equal to the diameter of the mounting column 14, the anti-dislocation column 151 is tightly matched with the inner circumferential thread 142 through the outer circumferential thread 152, when the anti-dislocation column 151 is rotated, the expansion head 154 is displaced, the expansion head 154 abuts against the mounting column 14 at the expansion structure groove 141, the mounting column 14 is expanded under pressure and tightly embedded in the bone groove, enhancing the fixing effect, preventing loosening and ensuring long-term stability, improving the quality of life of patients after surgery.

[0055] When it is necessary to install the anti-displacement limiting piece 15, the anti-displacement column 151 is screwed into the mounting column 14 from the end away from the expansion head 154, at which time the inner circumferential thread 142 of the mounting column 14 and the outer circumferential thread 152 of the anti-displacement column 151 are precisely engaged, after installation, the mounting column 14 on the tibial tray 11 is inserted into the bone groove, and from the opening on the side of the tibial tray 11 away from the bone groove, it is ensured that the mounting column 14 is accurately positioned with the bone groove, by inserting a hexagonal rod into the inner hexagonal groove 153 at the end of the anti-displacement column 151 in the mounting column 14, rotating the hexagonal rod to rotate the anti-displacement column 151, and gradually embedding the expansion head 154 into the expansion structure groove 141, the outer wall of the mounting column 14 is expanded to tightly fit the inner wall of the bone groove, forming a stable lock, effectively preventing the prosthesis from shifting, and ensuring that the surgical effect is durable and stable.

[0056] The diameter of the expansion head 154 is less than or equal to the diameter of the mounting column 14, which ensures that when the mounting column 14 drives the anti-displacement column 151 to be inserted into the bone groove, the expansion head 154 will not prematurely contact the inner wall of the bone groove, avoiding obstacles during installation, ensuring smooth installation, and ultimately achieving perfect fit of the anti-displacement column 151 with the bone groove, further improving the stability and safety of the prosthesis.

[0057] When the tibial tray 11 needs to be adjusted or replaced, the hexagonal rod is simply rotated in the opposite direction to cause the anti-displacement column 151 to exit the expansion structure groove 141, and the outer wall of the mounting column 14 to contract, allowing the prosthesis to be easily removed outward, which is simple to operate, reduces the pain of the patient, improves the efficiency of the operation, ensures that each adjustment or replacement can be quickly completed, does not affect the overall treatment effect, and ensures smooth postoperative recovery of the patient.

[0058] The mounting column 14 of the present application adopts a hollow structure and is provided with an expansion structure groove 141, and is internally equipped with an anti-displacement limiting piece 15, which, by rotating the anti-displacement column 151, can cause the pear-shaped expansion head 154 to expand the end of the mounting column 14 to tightly fit the bone surface, effectively enhancing the connection stability of the prosthesis and the bone, and reducing the risk of dislocation caused by conventional cylindrical fixed columns. The mounting column 14 is made of nickel-titanium-based memory alloy, which has shape memory effect and super elasticity, and after being implanted into the human body, it can better adapt to the body temperature and bone mechanical environment, further improving the fixing effect and reducing loosening and dislocation caused by stress changes.

[0059] Please refer to the accompanying drawings Figure 2 , Figure 5 , Figure 6 and Figure 7As shown, the insert 12 and the chamfered cutting talus piece 13 are provided with a self-resetting structure near the outer edge to prevent dislocation, the insert 12 and the chamfered cutting talus piece 13 realize the movement of the foot by sliding back and forth, the chamfered cutting talus piece 13 is provided with an arc structure near the outer edge of both sides, which can effectively disperse the pressure of the foot, reduce local wear and tear, and improve comfort, the insert 12 near the outer edge does not directly contact the chamfered cutting talus piece 13, leaving a small gap to ensure smooth movement of the foot, prevent excessive friction, and prolong the service life of the prosthesis, the self-resetting structure includes a self-resetting column 16 and a reset guide groove 161, the self-resetting column 16 is installed on the outer edge of the insert 12 near the chamfered cutting talus piece 13, the reset guide groove 161 is in a T-shaped structure, and the reset guide groove 161 is opened on the outer edge of the chamfered cutting talus piece 13 corresponding to the insert 12, the structure of the reset guide groove 161 is matched with the structure of the chamfered cutting talus piece 13, when the self-resetting column 16 moves inside the reset guide groove 161, it automatically displaces with the movement of the foot, at this time, the outer wall of the self-resetting column 16 does not generate friction with the inner wall of the reset guide groove 161, preventing the self-resetting column 16 from interfering with the normal movement of the foot, when the foot is outwardly turned, the self-resetting column 16 moves outwardly with the insert 12, at this time, the self-resetting column 16 generates friction with the reset guide groove 161, and displaces outwardly inside the structure groove of the reset guide groove 161, when the turning force disappears, the self-resetting column 16 resets and displaces with the insert 12, (after the turning force disappears, the person will automatically drive the ankle joint to reset, under the guidance of the T-shaped reset guide groove 161, the insert 12 drives the self-resetting column 16 to reset), due to the T-shaped structure of the reset guide groove 161, the person turns the foot outwardly due to the influence of the ankle joint structure, the self-resetting column 16 moves outwardly inside the T-shaped reset guide groove 161, and due to the structure limitation of the reset guide groove 161, the self-resetting column 16 will not be dislocated out of the reset guide groove 161. At this time, the self-resetting column 16 automatically resets under the guidance of the reset guide groove 161, effectively preventing dislocation, enhancing joint stability, improving patient walking safety, reducing postoperative complications, and ensuring long-term use effect.

[0060] The self-resetting structure of the present application is designed ingeniously, the reset process is smooth and unobstructed, significantly reducing wear and tear during the reset process, prolonging the service life of the prosthesis, reducing the patient's postoperative rehabilitation time, and improving the quality of life.

[0061] The outer edges of the insert 12 and the chamfered talar component 13 are equipped with a self-resetting structure consisting of a self-resetting post 16 and a T-shaped resetting guide groove 161. In the event of an outward sprain, the self-resetting post 16 moves within the resetting guide groove 161 and resets the insert 12 to its original position, reducing the risk of dislocation, maintaining joint stability, and alleviating the pain, limited mobility, and prosthesis wear associated with such a sprain or dislocation. The self-resetting post 16 is connected to the insert 12 and moves within the resetting guide groove 161 to reset the insert 12 when the insert 12 returns to its original position.

[0062] Please see the attached Figure 1 、 Figure 8 and Figure 9 As shown, the auxiliary positioning component 2 includes a fixing part 21 and a positioning part 22 for fixing the lower limbs of the human body. The fixing part 21 includes a fixing ring 211 for fixing and supporting the thigh and calf of the human body. The fixing ring 211 is arranged in a semicircular structure. A pressure sensing layer is arranged on the inner circumferential wall of the fixing ring 211. The pressure sensing layer is electrically connected to the external display device through a wire. By monitoring the pressure change in real time, the fixing effect is ensured, the secondary injury caused by improper fixation is avoided, and the safety of the operation and the efficiency of postoperative recovery are improved. Adjustment holes 212 are evenly opened on the fixing ring 211. The outer circumference of the fixing ring 211 is Several elastic straps are provided on the surrounding wall, one end of the elastic strap is fixedly connected to the fixing ring 211, and the other end is provided with a Velcro. Through the cooperation of the elastic strap and the Velcro, the fixing effect of the fixing ring 211 on the human leg can be further enhanced to prevent the fixing ring 211 from shifting during use. The two fixing rings 211 are connected by a connecting rod 213, and each connecting rod 213 is provided with a rotating adjustment seat 214. A limiting rod 215 for limiting the human leg is provided inside each rotating adjustment seat 214, and the extension direction of the limiting rod 215 is perpendicular to the extension direction of the connecting rod 213. (Used to fix and limit the human leg from the side) A breathable hollow rubber pad is set at the end of the limit rod 215, and the rubber pad is in contact with the human leg. The thread on the rotating adjustment seat 214 is provided with a limit screw 216 for tightening the limit rod 215. Through the adjustment of the limit screw 216, the limit rod 215 can be accurately positioned. The limit rod 215 replaces the built-in bone needle method during existing joint positioning, effectively avoiding the trauma and infection risks caused by the bone needle.

[0063] like Figures 7 to 9As shown, the positioning member 22 includes a positioning plate 221, the positioning plate 221 is perpendicular to the connecting rod 213, one end of the positioning plate 221 is slidably connected to the side of the connecting rod 213 away from the fixing ring 211 through a sliding seat 222, and a bone needle positioning hole 223 for positioning the bone needle is opened on the positioning plate 221, and a positioning bone needle 224 is arranged inside the bone needle positioning hole 223, and the positioning bone needle 224 matches the mounting through hole on the external tibial cutting member, and the tibial tray 11 is close to the mounting column 14. A fixing plate 112 is provided at the top of the side, and a fixing hole 113 matching the positioning bone pin 224 is opened through the fixing plate 112. Since the positioning bone pin 224 matches the mounting through-hole on the external tibial cutting piece, the fixing hole 113 on the tibial tray 11 is precisely docked with the positioning bone pin 224 to ensure that the tibial tray 11 can be firmly fixed in the predetermined position, preventing the tibial tray 11 from being displaced during the operation, thereby improving the surgical accuracy and stability, reducing postoperative complications, and accelerating the patient's recovery process.

[0064] One end of the positioning plate 221 is slidably connected to the side of the connecting rod 213 away from the fixing ring 211 through the sliding seat 222. The sliding seat 222 is provided with a locking device, which can adjust the position of the positioning plate 221 to ensure that the bone needle positioning hole 223 is accurately aligned with the front side of the tibial cut under X-ray imaging. After the leg is fixed by the fixing member 21, the positioning plate 221 is first fixed to the tibia of the ankle joint under X-ray imaging, and the locking device is adjusted to make the positioning plate 221 completely aligned with the front side of the tibial cut, and then the positioning bone needle 224 is inserted. To ensure that the tibial tray 11 fits tightly against the tibia and to avoid surgical errors, the external auxiliary cutting equipment uses the positioning bone pin 224 as the positioning point for precise cutting. After the cutting and bone surface processing are completed, the fixing hole 113 on the fixing plate 112 of the tibial tray 11 is precisely docked with the positioning bone pin 224, and the tibial tray 11 is inserted downward. At this time, the mounting column 14 on the tibial tray 11 is embedded in the bone surface groove to further stabilize the combination of the tibial tray 11 and the bone surface, ensure the accuracy of the surgical operation, effectively reduce the surgical risk, and improve the postoperative recovery effect.

[0065] The auxiliary positioning assembly 2 comprises a fixing part 21 and a positioning part 22, the fixing part 21 can stably fix the lower limbs of the human body, the positioning plate 221 of the positioning part 22 is connected with the connecting rod 213 through the sliding seat 222, the position can be flexibly adjusted, the positioning bone needle 224 is matched with the external tibial cutting part and the fixing hole 113 on the tibial tray 11, the installation position of the prosthesis can be ensured to be accurate, the success rate of the operation is improved, the bone needle positioning hole 223 is throughly arranged on the positioning plate 221 in the positioning part 22, the positioning bone needle 224 arranged inside is matched with the mounting through hole on the external tibial cutting part, and the fixing plate 112 on the tibial tray 11 is provided with the fixing hole 113 matched with the position of the positioning bone needle 224, so that the tibial tray 11 can be more accurately positioned during the installation process, the installation precision is improved, and the wear problem caused by the misplacement of the joint prosthesis is reduced.

[0066] The working process of the technical scheme provided by the application is as follows:

[0067] In use, the lower limbs of the patient are placed in the fixing ring 211, the non-invasive fastening is adjusted through the limiting rod 215 (the pressure sensing layer displays < 30kPa), the nerve compression is avoided, the elastic bandage is used for auxiliary fixing, under X-ray imaging, the sliding positioning plate 221 is slid to the tibial cutting position, the positioning bone needle 224 is inserted and aligned with the external cutting guide plate, the tibial / talar cutting is carried out by using the matched tool based on the positioning bone needle 224 as the reference, the bone groove (the groove for installing the overall ankle joint prosthesis) matched with the prosthesis is formed, the installation groove (the installation groove is divided into the tibial groove and the talar groove, and is used for fixing the installation column 14) is arranged on the bone surface, the auxiliary positioning assembly 2 is removed, the fixing hole 113 of the tibial tray 11 is aligned with the positioning bone needle 224 and is inserted, the installation column 14 is embedded into the tibial groove, the anti-dislocation column 151 is rotated by using the hexagonal tool, the expansion head 154 is used for expanding the installation column 14, the endosseous locking is completed, the embedded part 12 and the chamfered talar cutting part 13 are installed and tested, after the activity is flexible, the embedded part 12 and the chamfered talar cutting part 13 are removed, the installation column 14 on the chamfered talar cutting part 13 is embedded into the talar groove, the anti-dislocation column 151 is rotated by using the hexagonal tool, the expansion head 154 is used for expanding the installation column 14, the endotarsal locking is completed, the embedded part 12 is embedded into the tibial tray 11, the installation embedded groove 111 and the embedded block 121 are embedded into each other, the embedded part 12 is stably fixed, the postoperative loosening is prevented, the joint stability is improved, the perfect fit between the prosthesis and the bone is finally realized, and the patient can move freely after the operation.

[0068] The present application encompasses any alternatives, modifications, equivalent methods and solutions made to the essence and scope of the present application. In order to make the public have a thorough understanding of the present application, specific details are described in the following preferred embodiments of the present application, and the present application can also be fully understood without the description of these details to those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits, etc. are not described in detail.

[0069] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which should be considered as the protection scope of the present application.

Claims

1. An anti-dislocation ankle tibial prosthesis assembly, comprising an ankle tibial prosthesis assembly and an auxiliary positioning assembly for assisting the installation of the ankle tibial prosthesis assembly, characterized in that: The ankle joint tibial prosthesis assembly includes a tibial tray, an insert and a chamfered talar component, wherein the insert is located between the tibial tray and the chamfered talar component, and mounting posts for mounting with the tibia and talus are symmetrically provided on the upper side of the tibial tray and the outer wall on one side of the bottom side of the chamfered talar component, and an anti-dislocation limiter is provided inside each of the mounting posts, and an anti-dislocation self-resetting structure is provided near the outer edge of the insert and the chamfered talar component; The tibial tray is provided with a mounting insert groove on a side away from the mounting post, and an insert block is provided on an outer wall of one side of the insert to match and connect with the mounting insert groove; The anti-dislocation limiter includes an anti-dislocation column, an outer circumferential thread is provided on the outer circumferential wall of the anti-dislocation column and is threadedly connected to the inner circumferential thread on the inner wall of the mounting column, an inner hexagonal slot is provided at one end of the anti-dislocation column, and an expansion head is connected to the end of the anti-dislocation column away from the inner hexagonal slot, the expansion head is pear-shaped, and the diameter of the expansion head is less than or equal to the diameter of the mounting column; The self-resetting structure includes a self-resetting column and a reset guide groove, wherein the self-resetting column is mounted on the outer edge of the insert close to the chamfered talar component, and the reset guide groove is arranged in a T-shaped structure. The reset guide groove is correspondingly opened on the outer edge of the chamfered talar component located on one side of the insert, and the self-resetting column is movably located inside the reset guide groove, and the direction structure of the reset guide groove matches the structure of the chamfered talar component; The auxiliary positioning assembly includes a fixing member and a positioning member for fixing the lower limbs of the human body, the fixing member includes a fixing ring for fixing and supporting the thigh and calf of the human body, the fixing ring is arranged in a semicircular structure, and adjustment through holes are evenly opened on the fixing ring. The two fixing rings are connected by a connecting rod, and each of the connecting rods is provided with a rotation adjustment seat, and a limit rod for limiting the position of the human leg is movably provided inside each rotation adjustment seat, and a limit screw for fastening the limit rod is threaded on the rotation adjustment seat; The positioning member includes a positioning plate, which is perpendicular to the connecting rod. One end of the positioning plate is slidably connected to the connecting rod away from the fixing ring through a sliding seat. The sliding seat is connected to the connecting rod through a fastening bolt. A bone needle positioning hole for positioning the bone needle is opened through the positioning plate. A positioning bone needle is arranged inside the bone needle positioning hole. The positioning bone needle matches the mounting through hole on the external tibial cutting member.

2. The anti-dislocation ankle tibial prosthesis assembly according to claim 1, characterized in that: The mounting column is a hollow structure with openings on both sides, and expansion structure grooves are symmetrically provided on the outer walls on both sides of one end of the mounting column. An inner circumferential thread is provided on the central circumferential wall inside the mounting column, and the end of the mounting column away from the expansion structure groove is connected to the tibial tray and the chamfered talar component.

3. The anti-dislocation ankle tibial prosthesis assembly according to claim 1, characterized in that: The material of the mounting column is nickel-titanium based shape memory alloy.

4. The anti-dislocation ankle tibial prosthesis assembly according to claim 1, characterized in that: A fixing plate is provided on the top of the tibial tray close to the mounting column, and a fixing hole matching the positioning bone pin is provided through the fixing plate.

5. The anti-dislocation ankle tibial prosthesis component according to claim 1, characterized in that: The contact surfaces of the tibial tray, the insert and the chamfered talar component are all provided with a biocompatible coating.

6. The anti-dislocation ankle tibial prosthesis component according to claim 1, characterized in that: A pressure sensing layer is provided on the inner circumferential wall of the fixing ring, and the pressure sensing layer is electrically connected to an external display device through a wire.

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