An ankle osteotomy guide assembly

Abstract

The present invention relates to an ankle osteotomy guide plate assembly capable of providing stable support during surgery, including a tibial guide plate and a talar guide plate. The tibial guide plate has a medial side facing the medial malleolus of the tibia, a lateral side opposite to the medial side, a superior side facing the knee joint, an inferior side opposite to the superior side, a first lateral side close to the fibula, and a second lateral side opposite to the first lateral side. A first supporting foot and a second supporting foot are provided on the inferior side of the tibial guide plate. The first supporting foot is arranged close to the fibula, and the second supporting foot is arranged away from the fibula. Both the first supporting foot and the second supporting foot can abut against the tibia, and the distance that the first supporting foot extends towards the talus is greater than the distance that the second supporting foot extends towards the talus.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an ankle osteotomy guide plate assembly. Background Art

[0002] Total ankle arthroplasty has currently become the main treatment method for end-stage joint diseases. It restores joint movement by means of osteotomy and then installing artificial joint implants, greatly improving the quality of life of patients. The success of total ankle arthroplasty depends on the positioning of the ankle joint, the gap, and soft tissue balance, and all three rely on whether the position of the implanted prosthesis is accurate.

[0003] During ankle arthroplasty, the doctor needs to rely on his own experience to set the proximal tibia osteotome on the proximal tibia of the patient and then set the tibia alignment inspection device on the proximal tibia osteotome to verify the tibial mechanical axis to confirm whether the installation position of the proximal tibia osteotome is appropriate, and then adjust the proximal tibia osteotome to a suitable position to guide the doctor to complete the proximal tibia osteotomy operation, ensuring that the lower limb after the proximal tibia osteotomy operation can restore normal joint movement of the ankle joint after being assembled with the artificial joint prosthesis. To improve the accuracy of the osteotomy operation, in the prior art, there are osteotomy guide plates designed based on medical imaging data and manufactured using 3D printing technology. These osteotomy guide plates manufactured by 3D printing can be customized according to patients, thereby achieving precise osteotomy. These osteotomy guide plates in the prior art are fixed by Kirschner wires during the operation. However, in severe cases such as comminuted fractures, it is difficult for the osteotomy guide plate to form a stable support at the ankle joint, which will affect the positioning accuracy of the osteotomy plate. Therefore, it is necessary to improve the existing osteotomy guide plate to achieve stable support of the osteotomy guide plate during the operation. Summary of the Invention

[0004] The purpose of the present invention is to provide an ankle osteotomy guide plate assembly that can provide stable support during the operation.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] An ankle osteotomy guide plate assembly includes a tibia guide plate and a talus guide plate, and is characterized in that: the tibia guide plate has an inner side facing the medial malleolus of the tibia, an outer side opposite to the inner side, an upper side facing the knee joint, a lower side opposite to the upper side, a first side close to the fibula, and a second side opposite to the first side; a first support foot and a second support foot are arranged on the lower side of the tibia guide plate, the first support foot is arranged close to the fibula, the second support foot is arranged away from the fibula, both the first support foot and the second support foot can abut against the tibia, and the distance that the first support foot extends towards the talus is greater than the distance that the second support foot extends towards the talus.

[0007] In one embodiment, the inner sides of the first support foot and the second support foot are both first curved surfaces that conform to the corresponding tibial bone surfaces.

[0008] In one embodiment, the bottom of the first support foot has a first hook portion that is partially inserted into the joint space between the tibia and the talus, and the bottom of the second support foot has a second hook portion that is partially inserted into the joint space between the tibia and the talus.

[0009] In one embodiment, the inner side of the tibial guide plate is a second curved surface that conforms to the surface of the medial malleolus of the tibia.

[0010] In one embodiment, two first locking holes are provided on the tibial guide plate, and the two first locking holes are distributed on both sides of the upper part of the tibial guide plate near the first and second sides. The two first locking holes both penetrate the tibial guide plate from the outside to the inside and are inclined holes that are inclined from the corresponding two sides towards the middle.

[0011] In one embodiment, two second locking holes are further provided in the middle of the tibial guide plate, and the two second locking holes are straight holes that vertically penetrate the tibial guide plate from the outside to the inside.

[0012] In one embodiment, a convex platform is provided on the outer side of the tibial guide plate, and a plurality of imaging holes are provided on the convex platform in the up and down direction. The imaging holes include two first imaging holes on one end side near the connection between the convex platform and the tibial guide plate, and a second imaging hole on one end side of the convex platform away from the tibial guide plate. The two first imaging holes are symmetrically distributed on both sides of the central axis in the inside and outside direction of the convex platform, and the second imaging hole is located on the central axis in the inside and outside direction of the convex platform.

[0013] In one embodiment, a number of first grooves are provided on both the first and second sides of the left side of the tibial guide plate.

[0014] In one embodiment, the talar guide plate has an inner side facing the medial malleolus of the tibia, an outer side opposite to the medial side, an upper side facing the knee joint, a lower side opposite to the upper side, a third side near the fibula, and a fourth side opposite to the third side. A concave surface that is recessed towards the knee joint is provided on the lower side of the talar guide plate, and the concave surface is matched with the protrusion on the neck of the talus. When the talar guide plate is attached to the talus, the protrusion on the neck of the talus can extend into the concave surface.

[0015] In one embodiment, the inner side of the talar guide plate is a third curved surface that conforms to the surface of the medial malleolus of the talus.

[0016] In one embodiment, a second convex portion is provided on the third curved surface at the position corresponding to the talar sulcus on the talus, and the second convex portion can extend into the talar sulcus of the talus.

[0017] In one embodiment, the third curved surface of the talus guide plate corresponds to the distal end of the talus and is located on the side away from the fibula.

[0018] In one embodiment, two third locking holes and one fourth locking hole are provided on the talus guide plate; the two third locking holes are distributed on both sides of the talus guide plate close to the third and fourth sides, and are straight holes that penetrate the talus guide plate from the outside to the inside; the fourth locking hole is an inclined hole that penetrates the talus guide plate obliquely from the side to the inside of the talus guide plate.

[0019] In one embodiment, a plurality of second grooves are provided on the left third and fourth sides of the tibia guide plate.

[0020] Adopting the above technical solution, the beneficial effect of the present invention is that the ankle osteotomy guide plate assembly provided by the present invention is provided with a supporting foot on the tibia guide plate, so that the tibia guide plate can be designed according to the bone shape characteristics, so that it can better abut on the tibia of the patient, play a role in stably supporting the tibia guide plate, and enable the tibia guide plate to better adhere and position on the tibia of the patient, and further enable the tibia guide plate to be fixed more conveniently and firmly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shows a perspective view of the tibia guide plate from one perspective.

[0022] Figure 2 Shows a perspective view of the tibia guide plate from another perspective.

[0023] Figure 3 Shows the front view of the tibia guide plate.

[0024] Figure 4 Shows a perspective view of the tibia guide plate from yet another perspective.

[0025] Figure 5 Shows the top view of the tibia guide plate.

[0026] Figure 6 Shows a perspective view of the talus guide plate from one perspective.

[0027] Figure 7 Shows a perspective view of the talus guide plate from another perspective.

[0028] Figure 8 Shows the front view of the talus guide plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so as to more clearly understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only to illustrate the essential spirit of the technical solution of the present invention.

[0030] In the following description, for the purpose of explaining various disclosed embodiments, certain specific details are set forth to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures and techniques associated with the present application may not be shown or described in detail so as not to unnecessarily obscure the description of the embodiments.

[0031] Unless the context requires otherwise, throughout the specification and claims, the words "comprise" and its variants, such as "comprising" and "having", should be understood in an open, inclusive sense, i.e., construed to mean "including, but not limited to".

[0032] References throughout the specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" throughout the specification do not necessarily all refer to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0033] As used in this specification and the appended claims, the singular forms "a" and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally used in its inclusive sense of "and / or" unless the context clearly dictates otherwise.

[0034] In the following description, in order to clearly show the structure and working mode of the present invention, many directional terms will be used for description. However, words such as "front", "rear", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as limiting terms.

[0035] Furthermore, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0036] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0037] The ankle osteotomy guide plate assembly provided in this embodiment includes a tibial guide plate 1 and a talar guide plate 2. As Figures 1 to 3 shown, the tibial guide plate 1 shown in this embodiment is in the shape of a left ankle. If it is a right ankle, the shape of the tibial guide plate is a mirror image of the left ankle.

[0038] For the convenience of description, the direction of the tibial guide plate 1 is defined by the usage orientation of the tibial guide plate 1 during the operation. Among them, the side that fits the medial malleolus of the tibia is defined as the medial side, the side opposite to the medial side is the lateral side, the side facing the knee joint is the upper side, the side opposite to the upper side is the lower side, the side close to the fibula side is the right side, and the other side opposite to the right side is the left side.

[0039] A first support foot 11 and a second support foot 12 are provided on the lower side of the tibial guide plate 1. Among them, the first support foot 11 is arranged close to the fibula, and the second support foot 12 is arranged away from the fibula. That is, the first support foot 11 is located on the right side of the lower side of the tibial guide plate 1, and the second support foot 12 is located on the left side of the lower side of the tibial guide plate 1. Moreover, the distance that the first support foot 11 extends toward the talus is greater than the distance that the second support foot 12 extends toward the talus, so that both the first support foot 11 and the second support foot 12 can be designed according to the bone shape characteristics, enabling them to better abut against the patient's tibia, playing a role in stably supporting the tibial guide plate 1, allowing the tibial guide plate 1 to better adhere and position on the patient's tibia, and further enabling the tibial guide plate 1 to be fixed more conveniently and stably.

[0040] In one embodiment, referring to Figure 4 , the inner surfaces of the first support foot 11 and the second support foot 12 are the first curved surfaces 111 that fit the surface of the talar bone, so that both the first and second support feet of the tibial guide plate 1 can support and position on the patient's talus, enabling more accurate positioning during the operation and not easily sliding, which is beneficial to the accurate positioning and fixation of the tibial guide plate 1 during the operation. At the same time, the bottoms of the first support foot 11 and the second support foot 12 have first hooks 111 and second hooks 121 that are partially inserted into the joint space between the tibia and the talus, allowing the first support foot 11 and the second support foot 12 to directly hook the most distal end of the tibia, controlling the degree of freedom in the tibial axial direction.

[0041] In one embodiment, the inner side surface of the tibial guide plate 1 is a second curved surface 13 that conforms to the surface of the medial malleolus of the tibia. The second curved surface 13 can be customized based on the patient's medical imaging data and realized by 3D printing technology to conform to the bone surface at the medial malleolus of the patient's tibia, providing a basis for more accurate osteotomy. As Figure 4 described, based on the patient's medical imaging data, it is found that there is a concave portion on the tibial bone shape of the patient. Therefore, in the customized design, a first convex portion 131 is provided at the position of the second curved surface 13 corresponding to the concave portion of the patient's tibia, so that the second curved surface can better adhere to the tibia, and thus the tibial guide plate 1 can be more easily and accurately positioned and fixed on the ankle joint.

[0042] See Figures 1 - 3 , two first locking holes 14 are provided on the tibial guide plate 1, and the two first locking holes 14 are distributed on the left and right sides of the upper part of the tibial guide plate 1. Both of the two first locking holes 14 are inclined holes. The first locking hole 14 penetrates the tibial guide plate 1 from the outside to the inside direction and is inclined from the left and right sides towards the middle direction. By setting the first locking hole 14 as an inclined hole, compared with the locking hole with a straight hole design in the prior art, during the operation, the fixing screw located in the locking hole 14 of this embodiment is also inclined and driven into the patient's body, so that more bone mass can be fixed, which is beneficial to better fixing the tibial guide plate 1.

[0043] Preferably, two second locking holes 15 are further provided in the middle of the tibial guide plate 1. Both of the two second locking holes 15 are straight holes, and the second locking hole 15 vertically penetrates the tibial guide plate 1 from the outside to the inside direction. The positions of the two second locking holes 15 are correspondingly arranged with the two hole positions of the osteotomy plate corresponding to the tibia. The function of the first locking hole 14 is to stabilize the tibial guide plate 1 so that the tibial guide plate 1 does not move or shake on the tibia. During the operation, first drive a Kirschner wire along the first locking hole 14, and then drive a Kirschner wire along the second locking hole 15 to fix the guide plate. Then take out the Kirschner wire in the first locking hole 14, remove the tibial guide plate 1, and leave the two Kirschner wires in the second locking hole 15. At this time, insert the osteotomy plate along the two remaining Kirschner wires, so as to position the osteotomy plate on the patient's tibia.

[0044] See Figure 1 、 Figure 2 and Figure 5, the tibial guide plate 1 in this embodiment also has a function of radiographic alignment, including a boss 16 provided on the outer side surface of the tibial guide plate 1. A plurality of radiographic holes are provided on the boss 16 along the up-down direction, and each radiographic hole is used to accommodate a Kirschner wire. During the operation, the Kirschner wire can be inserted into the corresponding radiographic hole for external radiographic imaging to confirm that the osteotomy position is aligned with the anatomical axis. In this embodiment, the boss 16 is provided with two first radiographic holes 161 and one second radiographic hole 162. Among them, the two first radiographic holes 161 are blind holes, which are provided on one end of the connection between the boss 16 and the tibial guide plate 1, and are symmetrically distributed on both sides of the central axis in the inner-outer direction of the boss. The second radiographic hole 162 is a through hole, which is provided on one end of the boss 16 away from the tibial guide plate 1 and is located on the central axis in the inner-outer direction of the boss. During the operation, slightly adjust the position of the tibial guide plate 1 on the patient's ankle joint, so that the two Kirschner wires inserted into the two first radiographic holes 161 respectively correspond to the left and right sides of the tibia, and at the same time, make the Kirschner wire inserted into the second radiographic hole 162 aligned with the anatomical axis, thereby accurately determining the osteotomy position.

[0045] Preferably, referring to Figure 1 and Figure 2 , a plurality of first grooves 17 are provided on the left and right sides of the boss 16 and the tibial guide plate 1. The first grooves 17 not only facilitate grasping the tibial guide plate 1 during the operation, but also can increase the friction during grasping, playing an anti-slip role, so that the tibial guide plate 1 is not easily dropped during the operation.

[0046] As Figures 6 to 8 shown, the talar guide plate 2 shown in this embodiment is also in the shape of a left ankle. If it is a right ankle, the shape of the talar guide plate is a mirror image of the left ankle.

[0047] For the convenience of description, the direction of the talar guide plate 2 is defined by the use orientation of the talar guide plate 2 during the operation. Among them, the side direction in contact with the medial malleolus of the tibia is the medial side, the side opposite to the medial side is the lateral side, the side direction facing the knee joint is the upper side, the side opposite to the upper side is the lower side, the side close to the fibula side is the right side, and the other side opposite to the right side is the left side.

[0048] A concave surface 21 that is recessed in the direction of the knee joint is provided on the lower side of the talar guide plate 2. The concave surface 21 is provided in cooperation with the protrusion on the talar neck. When the talar guide plate 2 is attached to the talus, the protrusion on the talar neck can extend into the concave surface 21, so that the talar guide plate 2 can straddle the bone neck. This can not only make the talar guide plate 2 better attach and position on the patient's talus, but also make the talar guide plate 2 more convenient and stable to be fixed.

[0049] In one embodiment, the inner side of the talus guide plate 2 is the third curved surface 23 that fits the surface of the medial malleolus of the talus. The third curved surface 23 can be personalized based on the patient's medical imaging data and is realized by 3D printing technology to fit the bone surface at the medial malleolus of the patient's talus, providing a basis for more accurate osteotomy. Preferably, the talus guide plate 2 is disposed corresponding to the distal end of the talus and on the side away from the fibula, that is, the talus guide plate 2 is disposed towards the medial side of the body. Correspondingly, the third curved surface 23 also fits the bone surface of the distal end of the talus on the side away from the fibula, allowing the third curved surface 23 to have more bone contact and enabling the fitting position of the talus guide plate 2 and the talus to be confirmed faster and better. More preferably, a part of the third curved surface 23 extends towards the joint surface and adheres to the joint surface, and the amount of extension to the joint surface is determined according to the bone type characteristics of the patient, thereby allowing the third curved surface 23 to have more bone contact and enabling the talus guide plate 2 to better adhere to the talus.

[0050] Another preferably, a second convex portion 231 is provided on the third curved surface 23 corresponding to the talar sulcus on the talus. During the operation, the second convex portion 231 can extend into the talar sulcus of the talus, making it easier and more accurate to position and fix the talus guide plate 2 on the ankle joint.

[0051] See Figures 6 - 8 As shown, two third locking holes 24 and a fourth locking hole 25 are provided on the talus guide plate 2. The two third locking holes 24 are distributed on the left and right sides of the talus guide plate 2. Both of the two third locking holes 24 are straight holes that penetrate the talus guide plate 2 from the outside to the inside. The fourth locking hole 25 is an inclined hole that penetrates the talus guide plate 2 obliquely from the upper part of the talus guide plate 2 towards the medial direction.

[0052] The positions of the two third locking holes 24 are correspondingly set with the two hole positions of the osteotomy plate corresponding to the talus. The function of the fourth locking hole 25 is to stabilize the talus guide plate 2 so that the talus guide plate 2 does not move or shake on the talus. During the operation, first insert a Kirschner wire along the fourth locking hole 25, and then insert a Kirschner wire along the third locking hole 24 to fix the guide plate. Then remove the Kirschner wire in the fourth locking hole 25 and remove the talus guide plate 2, leaving the two Kirschner wires in the third locking holes 24. At this time, insert the two hole positions of the osteotomy plate corresponding to the talus part along the remaining two Kirschner wires, and cooperate with the two Kirschner wires on the tibia to realize the positioning of the four hole positions, ensuring the precise positioning of the osteotomy plate.

[0053] Refer to Figure 6 and Figure 7 As shown, a plurality of second grooves 26 are provided on the left and right sides of the talus guide plate 2. The second grooves 26 not only facilitate grasping the talus guide plate 2 during the operation, but also increase the friction during grasping, playing an anti-slip role and making the talus guide plate 2 not easy to fall during the operation.

[0054] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. An ankle osteotomy guide assembly, comprising a tibial guide and a talus guide, characterized in that: The tibial guide has a medial side facing the medial malleolus of the tibia, a lateral side opposite to the medial side, a superior side facing the knee joint, an inferior side opposite to the superior side, a first lateral side close to the fibula, and a second lateral side opposite to the first lateral side; a first supporting foot and a second supporting foot are provided on the inferior side of the tibial guide, the first supporting foot is arranged close to the fibula, the second supporting foot is arranged away from the fibula, both the first supporting foot and the second supporting foot can abut against the tibia, and the distance that the first supporting foot extends towards the talus is greater than the distance that the second supporting foot extends towards the talus; The inner surfaces of the first supporting foot and the second supporting foot are both first curved surfaces that conform to the corresponding tibial bone surfaces; The bottom of the first supporting foot has a first hook portion partially inserted into the joint space between the tibia and the talus, and the bottom of the second supporting foot has a second hook portion partially inserted into the joint space between the tibia and the talus.

2. The ankle osteotomy guide plate assembly according to claim 1, wherein: The inner surface of the tibial guide is a second curved surface that conforms to the surface of the medial malleolus of the tibia.

3. The ankle osteotomy guide plate assembly according to claim 1, wherein: Two first locking holes are provided on the tibial guide, and the two first locking holes are distributed on both sides of the upper part of the tibial guide close to the first and second lateral sides. The two first locking holes are inclined holes that penetrate the tibial guide from the outside to the inside and are inclined towards the middle from the corresponding two sides respectively.

4. The ankle osteotomy guide plate assembly according to claim 1, wherein: Two second locking holes are further provided in the middle of the tibial guide, and the two second locking holes are straight holes that vertically penetrate the tibial guide from the outside to the inside.

5. The ankle osteotomy guide plate assembly according to claim 1, characterized in that: A boss is provided on the outer surface of the tibial guide, and a plurality of imaging holes are provided on the boss along the up-down direction. The imaging holes include two first imaging holes on one end side close to the connection between the boss and the tibial guide, and a second imaging hole on the end side of the boss away from the tibial guide. The two first imaging holes are symmetrically distributed on both sides of the central axis of the boss in the inner-outer direction, and the second imaging hole is located on the central axis of the boss in the inner-outer direction.

6. The ankle osteotomy guide plate assembly according to claim 1, characterized in that: A number of first grooves are provided on both the first and second sides on the left of the tibial guide.

7. The ankle osteotomy guide plate assembly according to claim 1, wherein: The talar guide has a medial side facing the medial malleolus of the tibia, a lateral side opposite to the medial side, a superior side facing the knee joint, an inferior side opposite to the superior side, a third lateral side close to the fibula, and a fourth lateral side opposite to the third lateral side. A concave surface recessed towards the knee joint is provided on the inferior side of the talar guide, and the concave surface is matched with the protrusion on the neck of the talus. When the talar guide is attached to the talus, the protrusion on the neck of the talus can extend into the concave surface.

8. The ankle osteotomy guide plate assembly according to claim 7, characterized in that: The inner surface of the talar guide is a third curved surface that conforms to the surface of the medial malleolus of the talus.

9. The ankle osteotomy guide plate assembly according to claim 8, wherein: A second convex portion is provided on the third curved surface at the position corresponding to the talar sulcus on the talus, and the second convex portion can extend into the talar sulcus of the talus.

10. The ankle osteotomy guide plate assembly according to claim 7, characterized in that: The third curved surface of the talar guide corresponds to the distal end of the talus and is located on the side away from the fibula.

11. The ankle osteotomy guide plate assembly according to claim 7, characterized in that: There are two third locking holes and one fourth locking hole provided on the talus guide plate; the two third locking holes are distributed on the two sides of the talus guide plate close to the third and fourth sides, and are straight holes that penetrate the talus guide plate from the outside to the inside; the fourth locking hole is an inclined hole that penetrates the talus guide plate obliquely from the side to the inner side of the talus guide plate.

12. The ankle osteotomy guide plate assembly according to claim 7, wherein: A plurality of second grooves are provided on the third and fourth sides of the tibia guide plate.

Images