Ankle joint tibial prosthesis, ankle joint prosthesis and navigation system

Abstract

The invention relates to an ankle joint tibia prosthesis, an ankle joint prosthesis and a navigation system.The ankle joint tibia side prosthesis comprises a prosthesis body and a sliding part, the sliding part is arranged on the rear side of the prosthesis body, the position of the sliding part relative to the prosthesis body in the front-back direction of the prosthesis body is adjustable, and the sliding part is arranged on the back side of the prosthesis body. And the prosthesis main body and the sliding piece are in contact with a tibia osteotomy surface. The ankle joint tibia prosthesis can adapt to tibia anatomical structure differences of different patients, the covering effect of the ankle joint tibia prosthesis and the tibia osteotomy surface is good, the stability of the ankle joint tibia prosthesis after implantation is improved, and adverse reactions of postoperative patients are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an ankle tibial prosthesis, an ankle prosthesis and a navigation system. BACKGROUND

[0002] Current artificial ankle tibial prostheses have limited specifications and are difficult to fully adapt to the tibial anatomical morphology of different patients. For some patients with special tibial morphology, such as too small tibial platform and too large tibial inclination, there may be no suitable prosthesis specification to adapt to, resulting in incomplete coverage of the tibial prosthesis. In addition, the commonly used ankle tibial prosthesis in clinical practice is a general prosthesis, which is designed according to the average anatomical data of the general population and cannot take into account individual differences. For patients with special tibial morphology, the prosthesis may not fit the tibia well, resulting in incomplete bone coverage. If the tibial prosthesis does not cover the tibial osteotomy surface, stress distribution may not be concentrated due to reduced contact area, the prosthesis may loosen, and the patient's ankle position may be painful. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, an embodiment of the present application proposes an ankle tibial prosthesis that can adapt to the anatomical differences of different patients' tibias, has a good coverage effect with the tibial osteotomy surface, and is beneficial to improve the stability of the ankle tibial prosthesis after implantation and reduce the adverse reactions of the patient after surgery.

[0005] An embodiment of the present application also proposes an ankle prosthesis.

[0006] An embodiment of the present application also proposes a navigation system.

[0007] The ankle tibial prosthesis of an embodiment of the present application comprises a prosthesis body and a sliding member, the sliding member is arranged on the rear side of the prosthesis body, the position of the sliding member relative to the prosthesis body in the front-rear direction of the prosthesis body is adjustable, and the prosthesis body and the sliding member are both in contact with the tibial osteotomy surface.

[0008] The ankle tibial prosthesis according to the embodiments of the present application can precisely cover the tibial bone resection surface, and avoid the problem of incomplete coverage of the tibial bone resection surface, because the position of the sliding member along the front-rear direction of the prosthesis body relative to the prosthesis body is adjustable, and the prosthesis body and the sliding member are both in contact with the tibial bone resection surface. Therefore, the ankle tibial prosthesis according to the embodiments of the present application can adapt to the anatomical structure differences of different patients, and has a good coverage effect on the tibial bone resection surface, which is beneficial to improve the stability of the ankle tibial prosthesis after implantation and reduce the adverse reactions of patients after surgery.

[0009] In some embodiments, one of the prosthesis body and the sliding member is provided with a sliding hole, and the other is provided with a guide rail part, the guide rail part is arranged in the sliding hole along the front-rear direction of the prosthesis body, and the distance that the guide rail part extends into the sliding hole is adjustable.

[0010] In some embodiments, the prosthesis body is provided with a guide rail part, the sliding member is provided with a sliding hole, and the ankle tibial prosthesis further comprises a locking member, the locking member is installed on the sliding member, and the locking member is movable between a locking position and a release position, in the locking position, the locking member extends into the sliding hole and abuts against the guide rail part, and in the release position, the locking member is spaced apart from the guide rail part, so that the guide rail part slides relative to the sliding hole.

[0011] In some embodiments, the locking member is a plurality of locking members, and the plurality of locking members are arranged in the left-right direction of the sliding member.

[0012] In some embodiments, the guide rail part is provided with a guide groove, the guide groove extends along the front-rear direction of the prosthesis body, in the release position, the locking member is in sliding fit with the guide groove, and in the locking position, the locking member abuts against the guide groove.

[0013] In some embodiments, the locking member is a threaded member, and the threaded member is in threaded fit with the sliding member.

[0014] In some embodiments, the rear side of the sliding member is provided with a first wall surface, the first wall surface is symmetrical about the median sagittal plane of the ankle tibial prosthesis, in the projection in the up-down direction perpendicular to the ankle tibial prosthesis, the profile line of the first wall surface is convex rearward, and the radius of curvature of the profile line of the first wall surface is R1, wherein 40mm≤R1≤100mm.

[0015] In some embodiments, the posterior side of the sliding member has a first wall surface, the first wall surface comprises a first surface and a second surface, the first surface and the second surface are respectively arranged on two sides of the medial sagittal plane of the ankle tibial prosthesis, and the first surface and the second surface satisfy at least one of the following conditions: The first surface is a plane, and extends backward in a direction toward the medial sagittal plane, and the included angle between the first surface and the medial sagittal plane is α, wherein 100°≤α≤160°. In a projection orthogonal to the up-down direction of the ankle tibial prosthesis, the profile of the second surface is convex backward, and the radius of curvature of the profile of the second surface is R2, wherein 30mm≤R2≤90mm.

[0016] In some embodiments, the anterior side of the prosthesis body has a second wall surface, the second wall surface is symmetrical about the medial sagittal plane of the ankle tibial prosthesis, and in a projection orthogonal to the up-down direction of the ankle tibial prosthesis, the profile of the second wall surface is convex forward, and the radius of curvature of the profile of the second wall surface is R3, wherein 20mm≤R3≤60mm.

[0017] In some embodiments, the outer wall surface of at least one of the prosthesis body and the sliding member has a texture or a coating for promoting bone ingrowth.

[0018] The ankle prosthesis of another embodiment of the present application comprises: an ankle tibial prosthesis, the ankle tibial prosthesis is any one of the ankle tibial prostheses described in the embodiments of the present application; an ankle talus prosthesis, the ankle talus prosthesis cooperates with the ankle talus prosthesis.

[0019] The ankle prosthesis according to the embodiments of the present application, since the position of the sliding member along the front-rear direction of the prosthesis body relative to the prosthesis body is adjustable, and the prosthesis body and the sliding member are both in contact with the tibial osteotomy surface, the doctor can adjust the front-rear position of the sliding member according to the size of the tibial osteotomy surface of the patient, so that the ankle tibial prosthesis can accurately cover the tibial osteotomy surface, and the problem of incomplete coverage of part of the tibial osteotomy surface is avoided. Therefore, the ankle tibial prosthesis of the embodiments of the present application can adapt to the differences in tibial anatomical structures of different patients, and has a good coverage effect on the tibial osteotomy surface, which is beneficial to improve the stability of the implanted ankle tibial prosthesis and reduce the adverse reactions of the patient after the operation.

[0020] The navigation system of another embodiment of the present application comprises: a tibial ankle prosthesis, which is the tibial ankle prosthesis of any one of the embodiments of the present application; a navigator and an identifier, which is arranged in the tibial ankle prosthesis, and the navigator is communicatively connected with the identifier, and the navigator can identify the position of the tibial ankle prosthesis through the identifier.

[0021] The navigation system according to the embodiment of the present application can detect the implantation position of the tibial ankle prosthesis through the navigator and the identifier, so that the doctor can adjust it to the correct area, which is beneficial to improve the covering effect of the tibial ankle prosthesis on the tibial bone resection surface, improve the stability of the tibial ankle prosthesis after implantation, and reduce the adverse reactions of the patient after the operation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a perspective view of the tibial ankle prosthesis according to an embodiment of the present application.

[0023] Figure 2 FIG. 2 is an exploded view of the tibial ankle prosthesis according to an embodiment of the present application.

[0024] Figure 3 FIG. 3 is an exploded view of the tibial ankle prosthesis according to another embodiment of the present application.

[0025] Figure 4 FIG. 4 is an exploded view of the tibial ankle prosthesis according to another embodiment of the present application.

[0026] Figure 5 FIG. 5 is a sectional view of the tibial ankle prosthesis according to an embodiment of the present application.

[0027] Figure 6 FIG. 6 is a front view of the sliding member of the tibial ankle prosthesis according to an embodiment of the present application.

[0028] Figure 7 FIG. 7 is a schematic view of the tibial ankle prosthesis according to a first embodiment of the present application.

[0029] Figure 8 FIG. 8 is a schematic view of the tibial ankle prosthesis cooperating with the tibial prosthesis according to the first embodiment of the present application.

[0030] Figure 9 FIG. 9 is a schematic view of the tibial ankle prosthesis according to a second embodiment of the present application.

[0031] Figure 10 FIG. 10 is a schematic view of the tibial ankle prosthesis cooperating with the tibial prosthesis according to the second embodiment of the present application.

[0032] Figure 11is a schematic view of a tibial component of an ankle joint prosthesis according to a third embodiment of the present application.

[0033] Figure 12 is a schematic view of a navigation system according to an embodiment of the present application.

[0034] Reference Signs: 1, prosthesis body; 11, guide rail part; 111, guide groove; 12, second wall surface; 2, sliding member; 21, sliding hole; 22, first wall surface; 221, first surface; 222, second surface; 3, locking member; 41, navigator; 411, display screen; 412, adjusting knob; 42, marker; 421, Bluetooth module; 422, battery; 43, transmission line; 5, tibia; 51, tibial bone resection surface; P1, median sagittal plane. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the embodiments described are examples of implementations and do not limit the scope of the application.

[0036] In the field of anatomy and medical devices, the directions and planes such as medial, lateral, anterior, posterior, distal, proximal, sagittal plane, coronal plane, transverse plane, etc. have specific meanings and are well known to those skilled in the art, and unless otherwise specified, these terms refer to the meanings recognized by those skilled in the art.

[0037] Generally, when describing a human body, a joint or a prosthesis, three types of sections are usually involved: sagittal plane, coronal plane and transverse plane. Among them, the sagittal plane refers to a longitudinal section that divides the human body or joint into left and right parts from front to back, wherein the sagittal plane passing through the median of the human body is the median sagittal plane, which divides the human body into two equal parts. The coronal plane refers to a longitudinal section that divides the human body or joint into front and back parts from left to right, and the coronal plane is perpendicular to the sagittal plane. The transverse plane is a plane that divides the human body or joint into upper and lower parts parallel to the ground plane, and the transverse plane is perpendicular to the coronal plane and the sagittal plane.

[0038] Generally, when describing a human body, a joint or a prosthesis, three types of different directions are involved: distal, proximal, medial and lateral. Among them, the distal end refers to the end of the human body or joint relatively far from the trunk. The proximal end refers to the inner side of the human body or joint relatively close to the trunk. The medial side refers to the side relatively close to the median sagittal plane of the human body. The lateral side refers to the side relatively far from the median sagittal plane of the human body. The anterior side refers to the end on the sagittal plane relatively close to the abdomen. The posterior side refers to the end on the sagittal plane relatively close to the back.

[0039] The embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.Figures 1 to 12 An ankle tibial prosthesis, an ankle prosthesis and a navigation system are described.

[0040] As shown in Figures 1 to 5 The ankle tibial prosthesis of the embodiment of the present application comprises a prosthesis body 1 and a sliding piece 2, the sliding piece 2 is arranged at the rear side of the prosthesis body 1, the position of the sliding piece 2 along the front-rear direction of the prosthesis body 1 is adjustable relative to the prosthesis body 1, and the prosthesis body 1 and the sliding piece 2 are both in contact with the tibial bone resection surface 51.

[0041] The ankle tibial prosthesis of the embodiment of the present application, since the position of the sliding piece 2 along the front-rear direction of the prosthesis body 1 is adjustable relative to the prosthesis body 1, and the prosthesis body 1 and the sliding piece 2 are both in contact with the tibial bone resection surface 51, the doctor can adjust the front-rear position of the sliding piece 2 according to the size of the tibial bone resection surface 51 of the patient, so that the ankle tibial prosthesis can accurately cover the tibial bone resection surface 51, and the problem of incomplete coverage of part of the tibial bone resection surface 51 is avoided.

[0042] Therefore, the ankle tibial prosthesis of the embodiment of the present application can adapt to the anatomical structure differences of different patients' tibias 5, and has a good coverage effect on the tibial bone resection surface 51, so that the stress is uniformly distributed on the tibial bone resection surface 51, the stress concentration problem caused by the poor fit of the prosthesis and the tibial bone resection surface 51 is reduced, and the stability of the implanted ankle tibial prosthesis is improved, and the adverse reactions of the patient after the operation are reduced.

[0043] In addition, the ankle tibial prosthesis of the embodiment of the present application can be applied to tibias 5 of various sizes, reducing the need for custom-made prostheses for special cases, reducing medical costs, and also reducing the number of revision surgeries caused by prosthesis fitting problems, further saving medical resources.

[0044] In the related art, the ankle tibial prosthesis is of a non-adjustable structure, when the tibial bone resection surface 51 is large, the ankle tibial prosthesis cannot adapt to the tibial bone resection surface 51, thereby causing the problem of incomplete coverage of the ankle tibial prosthesis. Incomplete bone coverage reduces the contact area between the prosthesis and the tibia 5, the stress is unevenly distributed, and the prosthesis is prone to micro-motion on the bone surface, thereby causing prosthesis wear, local bone resorption, pain and dysfunction, and infection and other problems.

[0045] The ankle tibial prosthesis of the embodiment of the present application can allow the sliding piece 2 to move freely within a certain range to realize the front-rear size adjustment function of the ankle tibial prosthesis, thereby forming a good coverage effect of the ankle tibial prosthesis on the tibia 5 after replacement. The ankle tibial prosthesis of the embodiment of the present application can be adjusted according to the specific size and shape of the tibia 5 of the patient, better adapt to the anatomical structure differences of different patients, and be conducive to improving the matching degree of the prosthesis and the tibia 5, and realizing precision medicine.

[0046] Optionally, as shown in Figures 2 to 6 One of the prosthesis body 1 and the sliding member 2 is provided with a sliding hole 21, and the other is provided with a guide rail part 11, the guide rail part 11 is arranged in the sliding hole 21 along the front-back direction of the prosthesis body 1, and the distance of the guide rail part 11 extending into the sliding hole 21 is adjustable. It can be understood that when the front-back size of the tibial side prosthesis of the ankle joint needs to be adjusted, the distance of the guide rail part 11 extending into the sliding hole 21 can be adjusted. The guide rail part 11 and the sliding hole 21 are in sliding fit, on the one hand, the movement direction of the sliding member 2 can be positionally constrained, so that the sliding member 2 can only move in the front-back direction, which is beneficial to improve the accuracy of the front-back adjustment of the sliding member 2, on the other hand, the matching form of the guide rail part 11 and the sliding hole 21 can improve the structural strength of the connection between the sliding member 2 and the prosthesis body 1.

[0047] In an example, as shown in Figures 2 to 6 The prosthesis body 1 is provided with a guide rail part 11, and the sliding member 2 is provided with a sliding hole 21, and the tibial side prosthesis of the ankle joint further comprises a locking member 3, the locking member 3 is installed on the sliding member 2, and the locking member 3 is movable between a locking position and a release position, in the locking position, the locking member 3 penetrates into the sliding hole 21, and abuts against the guide rail part 11, in the release position, the locking member 3 is spaced apart from the guide rail part 11, so that the guide rail part 11 slides relative to the sliding hole 21.

[0048] It can be understood that when the doctor needs to adjust the sliding member 2, the locking member 3 can be moved to the release position, at this time the sliding member 2 can move relative to the guide rail part 11 in the front-back direction, when the sliding member 2 is adjusted to the appropriate position, the doctor can switch the locking member 3 to the locking position to positionally constrain the sliding member 2. The tibial side prosthesis of the ankle joint of the embodiment of the present application fixes the sliding member 2 and the prosthesis body 1 in the above-mentioned manner, which can make the assembly and adjustment process of the tibial side prosthesis of the ankle joint simple and convenient for processing and manufacturing.

[0049] As shown in Figures 1 to 3 The locking member 3 is a plurality of, the plurality of locking members 3 are arranged in the left-right direction of the sliding member 2 (such as Figure 8 the medial-lateral direction of the tibia 5), thereby preventing the relative displacement between the sliding member 2 and the prosthesis body 1 after implantation, and improving the stability of the connection between the sliding member 2 and the prosthesis body 1.

[0050] Exemplarily, the locking member 3 is a threaded member, and the threaded member is in threaded fit with the sliding member 2, thereby facilitating the assembly and processing of the tibial side prosthesis of the ankle joint.

[0051] In other examples, the locking member 3 can also be a bayonet.

[0052] As shown in Figure 2 and Figure 3As shown, the guide rail part 11 has a guide groove 111 extending along the front-rear direction of the prosthesis body 1, and the locking member 3 is in sliding fit with the guide groove 111 in the release position and abuts against the guide groove 111 in the locking position. Since the locking member 3 can be in sliding fit with the guide groove 111 in the release position, the position accuracy of the sliding member 2 during movement is improved, and the problem of position deviation or tilting of the sliding member 2 in the left-right direction is avoided.

[0053] Exemplarily, the locking member 3 can be two, three or four. Among them, the number of guide grooves 111 is consistent with the number of locking members 3, and the plurality of locking members 3 correspond to the plurality of guide grooves 111 one by one.

[0054] In an example, as shown in Figure 7 and Figure 8 As shown, the rear side of the sliding member 2 has a first wall surface 22, which is symmetrical about the median sagittal plane PI of the tibial prosthesis of the ankle joint. It can be understood that the tibial prosthesis of the ankle joint is a symmetrical tibial prosthesis of the ankle joint. That is, the tibial prosthesis of the ankle joint is symmetrical about the median sagittal plane PI of the tibial prosthesis of the ankle joint.

[0055] It can be understood that the symmetrical tibial prosthesis of the ankle joint is applied to patients with normal development of the ankle joint without deformity. For the distal tibia 5 and the joint surface of the talus trochlea of the patient with normal development of the ankle joint without deformity, the joint surface is symmetrical arc-shaped contour, the tibia 5-talus force line is vertical (without varus / valgus or anteversion / posterior tilt), the joint space is uniform, and the stress can be uniformly transmitted to the lower extremity by the tibial prosthesis of the ankle joint.

[0056] The design of the symmetrical tibial prosthesis of the ankle joint completely fits the above characteristics. The symmetrical tibial prosthesis of the ankle joint has the following technical effects: (1) Since the joint surface of the normal ankle joint is symmetrical, the symmetrical tibial prosthesis of the ankle joint (the upper surface fits the distal tibia 5, and the lower surface is a standard arc), the talar prosthesis of the ankle joint (the upper surface completely adapts to the arc of the tibial prosthesis of the ankle joint) does not need to be adjusted in angle or thickness, and after implantation, it can directly restore the "arc-shaped joint motion trajectory" of the normal ankle joint. When the patient walks or stands on tiptoe after surgery, the contact area of the prosthesis and the bone is uniform, avoiding local stress concentration (such as not appearing the situation that the edge of a side prosthesis is stressed too much), which can reduce the risk of prosthesis loosening and wear, and prolong the service life of the prosthesis.

[0057] (2) The symmetrical tibial prosthesis of the ankle joint is a "standardized symmetrical design", and the doctor only needs to select the corresponding type according to the size of the patient's bone, without additional angle adjustment or filling, the operation time can be shortened by 30-60 minutes, the pulling of the surrounding soft tissues (such as ligaments and tendons) during surgery is less, and the incidence of postoperative complications such as bleeding and swelling is reduced by about 15%.

[0058] (3) Since the normal ankle joint movement is "arc rotation around the symmetry axis" (e.g., when dorsiflexion and plantar flexion, the talus slides along the symmetry track under the tibia 5), the articular surface of the symmetry type of tibial prosthesis of the ankle joint completely replicates this movement track, and the patient does not need to adapt to "non-self-habitual movement angle" after the operation, and can recover the normal ankle joint range of motion in the early stage.

[0059] In the projection in the up-down direction of the tibial prosthesis of the ankle joint, the profile line of the first wall surface 22 is convex to the back, and the radius of curvature of the profile line of the first wall surface 22 is R1, where 40mm≤R1≤100mm.

[0060] Exemplarily, R1 can be 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm. The tibial prosthesis of the ankle joint of the embodiment of the present application adopts the above parameters to design the radius of curvature R1 of the profile line of the first wall surface 22, which can improve the coverage effect of the rear side area of the sliding piece 2 on the natural tibia 5 of the human body, can meet the use requirements of most patients, and the stress is uniform, so that the tibial prosthesis of the ankle joint is more stable after implantation.

[0061] In another example, as shown in Figures 9 to 11 the rear side of the sliding piece 2 has the first wall surface 22, the first wall surface 22 includes a first surface 221 and a second surface 222, the first surface 221 and the second surface 222 are arranged on both sides of the median sagittal plane P1 of the tibial prosthesis of the ankle joint respectively, the first surface 221 is a plane, and the second surface 222 is a curved surface convex to the back. It can be understood that the tibial prosthesis of the ankle joint is an anatomical tibial prosthesis of the ankle joint.

[0062] It can be understood that the anatomical tibial prosthesis of the ankle joint is applied to patients with asymmetric ankle joint anatomical structure and abnormal force line caused by tibial plateau dysplasia and post-fracture deformity. So that the shape and function of the anatomical tibial prosthesis of the ankle joint are completely adapted to the anatomical structure and stress requirement of the patient's own ankle joint.

[0063] As shown in Figure 9 the first surface 221 extends backward in the direction toward the median sagittal plane P1, and the included angle between the first surface 221 and the median sagittal plane P1 is α, where 100°≤α≤160°. Exemplarily, α can be 100°, 110°, 120°, 130°, 140°, 150°, 160°.

[0064] The tibial prosthesis of the ankle joint of the embodiment of the present application adopts the above parameters to design the included angle α between the first surface 221 and the median sagittal plane P1, which can improve the coverage effect of the rear side area of the sliding piece 2 on the natural tibia 5 of the human body, can meet the use requirements of most patients, and the stress is uniform, so that the tibial prosthesis of the ankle joint is more stable after implantation.

[0065] In a projection in a vertical direction of the tibial prosthesis of the ankle joint, the profile line of the second surface 222 is convex to the back, and the radius of curvature of the profile line of the second surface 222 is R2, wherein 30mm≤R2≤90mm.

[0066] Exemplarily, R2 can be 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm.

[0067] The tibial prosthesis of the ankle joint of the embodiment of the present application adopts the above-mentioned parameter design for the radius of curvature R2 of the profile line of the second surface 222, which can improve the coverage effect of the rear side area of the sliding member 2 on the rear side edge of the natural tibia 5 of the human body, can meet the use requirements of most patients, and the stress is uniform, so that the tibial prosthesis of the ankle joint is more stable after implantation.

[0068] Optionally, as shown in Figure 7 and Figure 8 The front side of the prosthesis body 1 has a second wall surface 12, the second wall surface 12 is symmetrical about the median sagittal plane P1 of the tibial prosthesis of the ankle joint, in a projection in a vertical direction of the tibial prosthesis of the ankle joint, the profile line of the second wall surface 12 is convex to the front, and the radius of curvature of the profile line of the second wall surface 12 is R3, wherein 20mm≤R3≤60mm.

[0069] Exemplarily, R3 can be 20mm, 30mm, 40mm, 50mm, 60mm.

[0070] The tibial prosthesis of the ankle joint of the embodiment of the present application adopts the above-mentioned parameter design for the radius of curvature R3 of the profile line of the second wall surface 12, which can improve the coverage effect of the front side area of the sliding member 2 on the front side edge of the natural tibia 5 of the human body, can meet the use requirements of most patients, and the stress is uniform, so that the tibial prosthesis of the ankle joint is more stable after implantation.

[0071] Exemplarily, as shown in Figure 9 and Figure 10 When the anatomical tibial prosthesis of the ankle joint is applied to the tibia 5 of the right leg of the human body, the first surface 221 is located on the inner side of the median sagittal plane P1 of the tibia 5, and the second surface 222 is located on the outer side of the median sagittal plane P1 of the tibia 5.

[0072] Exemplarily, as shown in Figure 11 When the anatomical tibial prosthesis of the ankle joint is applied to the tibia 5 of the left leg of the human body, the first surface 221 is located on the inner side of the median sagittal plane P1 of the tibia 5, and the second surface 222 is located on the outer side of the median sagittal plane P1 of the tibia 5.

[0073] Optionally, the outer wall surface of at least one of the prosthesis body 1 and the sliding member 2 has a texture or a coating for promoting bone ingrowth to achieve biological fixation of the tibial ankle prosthesis and to enhance the stability of the tibial ankle prosthesis.

[0074] The ankle prosthesis of another embodiment of the present application comprises: a tibial ankle prosthesis and a talus ankle prosthesis, the tibial ankle prosthesis being the tibial ankle prosthesis of the present application, and the talus ankle prosthesis cooperating with the tibial ankle prosthesis.

[0075] The ankle prosthesis according to the embodiment of the present application can adjust the front and rear position of the sliding member 2 according to the size of the tibial bone resection surface 51 of the patient, so that the tibial ankle prosthesis can accurately cover the tibial bone resection surface 51, and the problem of incomplete coverage of the tibial bone resection surface 51 in some areas can be avoided. Therefore, the tibial ankle prosthesis of the embodiment of the present application can adapt to the anatomical structure differences of different patients, and has a good coverage effect on the tibial bone resection surface 51, which is beneficial to improve the stability of the tibial ankle prosthesis after implantation and reduce the adverse reactions of the patient after surgery.

[0076] As shown in Figure 12 The navigation system of another embodiment of the present application comprises: a tibial ankle prosthesis, a navigator 41 and a marker 42, the tibial ankle prosthesis being the tibial ankle prosthesis of the present application, the marker 42 being arranged in the tibial ankle prosthesis, and the navigator 41 being in communication connection with the marker 42, so that the navigator 41 can identify the position of the tibial ankle prosthesis through the marker 42.

[0077] The navigation system according to the embodiment of the present application can detect the implantation position of the tibial ankle prosthesis through the navigator 41 and the marker 42, so that the doctor can adjust it to the correct area, which is beneficial to improve the coverage effect of the tibial ankle prosthesis on the tibial bone resection surface 51, improve the stability of the tibial ankle prosthesis after implantation, and reduce the adverse reactions of the patient after surgery.

[0078] Exemplarily, as shown in Figure 12As shown, the navigator 41 and the identifier 42 are communicatively connected, which can be connected by wireless communication or wired connection through the transmission line 43. The navigator 41 has a display screen 411 and an adjusting knob 412, and the identifier 42 includes a Bluetooth module 421 and a battery 422. The transmission line 43 is electrically connected to the identifier 42 to identify the tibial cortex 5. The navigator 41 can identify the posterior or anterior cortical bone edge of the tibial side of the ankle joint prosthesis through the sensing signal transmitted by the transmission line 43. Thus, the doctor can adjust the tibial side of the ankle joint prosthesis on site according to the actual situation, without spending a lot of time finding the right size of the prosthesis or performing complex bone trimming, which helps to shorten the operation time and improve the operation efficiency.

[0079] Specifically, the navigation system further includes a motor drive mechanism (not shown), which is connected to the ankle joint tibial side prosthesis and is communicatively connected to the navigator 41. The doctor inputs relevant instructions and parameters on the navigator 41, and the computer control system drives the motor drive mechanism to act, so as to adjust the implantation position of the ankle joint tibial side prosthesis without manual pushing by the doctor using tools. Thus, more accurate and stable adjustment can be achieved, human operation error is reduced, and the effect and safety of the operation or treatment are improved.

[0080] Specifically, the motor drive mechanism can adopt a switched reluctance speed regulation motor or a servo motor, which is connected to a screw rod through a transmission mechanism, and the screw rod and a nut form a screw pair transmission. When the motor / motor rotates, the screw rod rotates, and the nut moves linearly on the screw rod. The nut is connected to the sliding piece 2 through a specific transmission mechanism (such as a four-column pin toggle mechanism, a five-column pin toggle mechanism, or direct connection), thereby driving the sliding piece 2 to move linearly along the guide rail part 11.

[0081] In other embodiments, the motor drive mechanism can also select an electric push rod, which includes a motor and a screw rod connected to each other. The motor drives the screw rod to rotate, so that the push rod moves linearly. One end of the push rod is connected to the sliding piece 2, thereby driving the sliding piece 2 to move along the guide rail part 11. In the case of using navigation technology, the doctor mainly inputs relevant instructions and parameters by operating the computer or the console, and the computer control system drives the movement of the sliding piece 2, without manual pushing by the doctor using tools. Thus, more accurate and stable adjustment can be achieved, human operation error is reduced, and the effect and safety of the operation or treatment are improved.

[0082] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0083] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0084] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0085] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0086] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising, but not limited to, any indicated features, integers, steps or components. It is also to be understood that the terminology "comprising" can be replaced by the terminology "consisting of" or "consisting essentially of" in some embodiments or examples.

[0087] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and should not be understood as limiting the present disclosure, and the changes, modifications, replacements and variations of the above-mentioned embodiments made by those skilled in the art are within the protection scope of the present disclosure.

Claims

1. A tibial component of a prosthetic ankle joint, characterized in that, include: Prosthetic body (1); The sliding member (2) is located on the rear side of the prosthesis body (1). The position of the sliding member (2) relative to the prosthesis body (1) is adjustable along the front-back direction of the prosthesis body (1). Both the prosthesis body (1) and the sliding member (2) are in contact with the tibial osteotomy surface (51).

2. The ankle tibial prosthesis of claim 1, wherein, One of the prosthesis body (1) and the slider (2) is provided with a sliding hole (21), and the other is provided with a guide rail (11). The guide rail (11) passes through the sliding hole (21) along the front-back direction of the prosthesis body (1), and the distance from which the guide rail (11) extends into the sliding hole (21) is adjustable.

3. The ankle tibial prosthesis of claim 2, wherein, The prosthesis body (1) has a guide rail (11), and the sliding member (2) has a sliding hole (21). The tibial prosthesis of the ankle joint also includes a locking member (3). The locking member (3) is installed on the sliding member (2). The locking member (3) is movable between a locked position and a released position. In the locked position, the locking member (3) is inserted into the sliding hole (21) and abuts against the guide rail (11). In the released position, the locking member (3) is spaced apart from the guide rail (11) so that the guide rail (11) slides relative to the sliding hole (21).

4. The ankle tibial prosthesis of claim 3, wherein, There are multiple locking elements (3), and the multiple locking elements (3) are arranged at intervals along the left and right directions of the sliding element (2).

5. The ankle tibial prosthesis of claim 3, wherein, The guide rail (11) has a guide groove (111) that extends along the front-rear direction of the prosthesis body (1). In the released position, the locking member (3) slides with the guide groove (111), and in the locked position, the locking member (3) abuts against the guide groove (111). And / or, the locking member (3) is a threaded member, which is threadedly engaged with the sliding member (2).

6. The ankle joint tibial prosthesis of any of claims 1-5, wherein, The rear side of the slider (2) has a first wall (22), which is symmetrical about the midsagittal plane (P1) of the tibial prosthesis of the ankle joint. In the projection orthogonal to the vertical direction of the tibial prosthesis of the ankle joint, the outline of the first wall (22) protrudes backward, and the radius of curvature of the outline of the first wall (22) is R1, wherein 40mm≤R1≤100mm.

7. The ankle joint tibial prosthesis of any of claims 1-5, wherein, The rear side of the slider (2) has a first wall surface (22), which includes a first surface (221) and a second surface (222). The first surface (221) and the second surface (222) are respectively arranged on both sides of the midsagittal plane (P1) of the tibial prosthesis of the ankle joint. The first surface (221) and the second surface (222) satisfy at least one of the following conditions: The first surface (221) is a plane and extends rearward in the direction toward the median sagittal plane (P1). The angle between the first surface (221) and the median sagittal plane (P1) is α, where 100°≤α≤160°. In a projection orthogonal to the superior-inferior direction of the tibial ankle prosthesis, the profile of the second face (222) is convex posteriorly and has a radius of curvature R2, wherein 30mm≤R2≤90mm.

8. The ankle joint tibial prosthesis of any of claims 1-5, wherein, The anterior side of the prosthesis body (1) has a second wall face (12) which is symmetrical about the median sagittal plane (P1) of the tibial ankle prosthesis, in a projection orthogonal to the superior-inferior direction of the tibial ankle prosthesis, the profile of the second wall face (12) is convex anteriorly and has a radius of curvature R3, wherein 20mm≤R3≤60mm; And / or, the outer wall face of at least one of the prosthesis body (1) and the sliding element (2) has a texture or a coating for promoting bone ingrowth.

9. An ankle prosthesis characterized in that, Comprising: A tibial ankle prosthesis according to any one of claims 1-8; A talus ankle prosthesis which cooperates with the tibial ankle prosthesis.

10. A navigation system characterized by comprising: Comprising: A tibial ankle prosthesis according to any one of claims 1-8; A navigator (41) and an identifier (42), the identifier (42) is arranged in the tibial ankle prosthesis, the navigator (41) is in communication connection with the identifier (42), the navigator (41) can identify the position of the tibial ankle prosthesis through the identifier (42).

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