CN216702728U

CN216702728U - Talus fusion surface type artificial ankle joint prosthesis

Info

Publication number: CN216702728U
Application number: CN202122429594.6U
Authority: CN
Inventors: 郭卫
Original assignee: Peking University Peoples Hospital
Current assignee: Peking University Peoples Hospital
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-06-10
Anticipated expiration: 2031-10-09

Abstract

The utility model relates to an artificial ankle joint prosthesis with a talus fusion surface, which comprises: the upper end of the tibia marrow cavity internal fixation prosthesis handle is used for being fixedly connected with a tibia marrow cavity; a prosthesis segment conically connected to the lower end of the shank bone marrow cavity fixing prosthesis stem; the joint gasket is embedded at the lower end of the prosthesis segment, and the lower surface of the joint gasket is of a concave cambered surface structure; the upper surface of the talus surface prosthesis is a polished convex cambered surface structure and is matched with the lower surface of the joint gasket in a form fit manner to form a smooth motion joint. The utility model can be widely applied to the bone defect reconstruction of limb continuous interruption after the resection of the distal tibia tumor, can realize the aim of limb structure recovery, and simultaneously realizes the perfect combination of instant stability and long-term stability of the tibialis distance joint, thereby obviously improving the function of the long-term ankle joint of a patient.

Description

Talus fusion surface type artificial ankle joint prosthesis

Technical Field

The utility model relates to an artificial prosthesis, in particular to an artificial talus fusion surface ankle joint prosthesis based on a 3D printing technology, and belongs to the technical field of medical instruments.

Background

The tibia is the second best site for osteosarcoma of the femur alone, accounting for about 19% of total osteosarcoma, with 20% occurring in the distal tibia. The distal tibia has difficulty in obtaining a good tumor boundary due to the presence of more tendons, blood vessels, and nerves. Therefore, the scholars recommend the amputation of the knee as the first surgical mode for the distal tibial osteosarcoma. However, with the advancement of chemotherapy and surgical techniques, the limb protection treatment of distal tibial osteosarcoma has also achieved good survival rates and is recognized and recommended by the vast majority of bone oncologists.

The reconstruction mode after the resection of the distal malignant tumor section of the tibia is various, and mainly comprises the reconstruction of allogeneic bones, the inactivation and replantation of autologous bones, the transplantation of autologous fibulas with vascular pedicles, the transplantation of autologous fibulas without vascular pedicles, the replacement of ankle joint prostheses and the like. The reconstruction of the allogeneic bone has the problems of high infection risk, allogeneic bone absorption, rejection reaction and the like, thereby increasing the risk of complications such as wound infection and the like. The autologous bone inactivation replanting method is various, the three most commonly used inactivation methods at home and abroad are an alcohol method, a liquid nitrogen method and a high-temperature method, and different inactivation methods have various advantages and disadvantages in the aspect of complications. The ankle joint bears the weight of the whole body, and the normal movement of the ankle joint can complete the daily walking movement, so that the ankle joint functional reconstruction method has important significance for reconstructing the functionality of the ankle joint of a patient with distal tibial malignant tumor and having postoperative curative effect. Ankle fusion has the advantages of restoring continuity of bony structures, providing good ankle stability, and reducing pain during weight bearing. But rely on steel plate screw system to realize the fixed patient with ankle joint fusion of shin bone distal end, along with the absorption of grafting back autogenous body bone, the fracture incidence of multiplicable postoperative deactivation autogenous bone and major segment xenogenesis bone. Although the reconstruction modes after resection of the distal malignant tumor section of the tibia are numerous at present, most reconstruction modes are at the cost of ankle joint mobility, and the normal ankle joint mobility is still difficult to accept for most patients, especially young patients. But a reconstruction mode capable of realizing perfect combination of ankle joint stability and good mobility after resection of a large tumor bone of a distal malignant tumor of a tibia remains a significant challenge for bone oncologists.

Ankle replacements are not as widely popularized as hip replacements, due primarily to the high incidence of mechanical failure of the long term prosthesis and the complications of incisions. Meanwhile, the postoperative function of the patient is seriously affected by the loosening failure of the prosthesis after the ankle joint replacement and the pain and swelling around the ankle. Studies have shown that the mechanical failure of artificial ankle joints is largely due to prosthetic talar bone collapse and prosthetic osteoarticular bone resorption at the bone interface.

At present, the 3D printing technology is widely applied to the field of orthopedics, and a large number of researches show that the porous structure metal not only has good histocompatibility and an ideal biomechanical structure, the 3D printing technology is adopted to individually copy the trabecular bone structure and density of a patient, the ideal porosity and pore diameter are ensured, the growth of host bones can be facilitated, and the fusion rate of prosthesis and the host bones is provided. The artificial joint prosthesis has the advantages that the mechanical strength of metal is far superior to that of a variant bone and a deactivated bone, the early stabilization can be realized, and a movable ankle joint can be reconstructed. But the disadvantage is also apparent that it is difficult to achieve an effective fusion between the autologous bone and the metal prosthesis. With the rapid development of digital orthopedics, the 3D printing technology can solve the puzzlement. In recent years, the additive manufacturing technology brings technical progress for processing of individual and customized artificial prostheses, and the technical advantages of 3D printing artificial prostheses are mainly reflected in two aspects, namely, shape matching and osseointegration. For the restoration and reconstruction of the far tibia, the 3D printing technology provides a more ideal strategy. Can produce the defective artificial prosthesis of shin bone hypomere that size, shape match through 3D printing, can produce the metal bone trabecula structure that supplies the bone to grow into on the contact interface of talus surface prosthesis and talus, can realize talus surface prosthesis and autologous talus formation bony fusion.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, an object of the present invention is to provide a talus fusion surface type artificial ankle prosthesis based on a 3D printing technique.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a talus fusion surface type artificial ankle joint prosthesis in a first aspect, which is mainly suitable for bone defect reconstruction of limb continuity interruption after tibia distal tumor resection, and comprises: the upper end of the tibia marrow cavity internal fixation prosthesis handle is used for being fixedly connected with a tibia marrow cavity; a prosthesis segment conically connected to the lower end of the shank bone marrow cavity fixing prosthesis stem; the joint gasket is embedded at the lower end of the prosthesis segment, and the lower surface of the joint gasket is of a concave cambered surface structure; the upper surface of the talus surface prosthesis is a polished convex cambered surface structure and is matched with the lower surface of the joint gasket in a form fit manner to form a smooth motion joint.

The utility model provides an artificial ankle joint prosthesis of talus fusion surface type in the second aspect, which is mainly suitable for ankle joint injury and rheumatoid arthritis cases, and comprises: the upper end of the tibia marrow cavity internal fixation prosthesis handle is used for being fixedly connected with a tibia marrow cavity; the joint gasket is embedded at the lower end of the tibia marrow cavity fixed prosthesis handle, and the lower surface of the joint gasket is of a concave cambered surface structure; the upper surface of the talus surface prosthesis is a polished convex cambered surface structure and is matched with the lower surface of the joint gasket in a form fit manner to form a smooth motion joint.

The talus fusion surface type artificial ankle joint prosthesis preferably freely selects the prosthesis segments with different lengths according to the resection range of the distal tibial tumor segment of a patient, the skin defect condition and the soft tissue tension.

The talus fusion surface type artificial ankle joint prosthesis is preferably characterized in that the joint liner is made of a high-molecular polyethylene material.

The talus fusion surface type artificial ankle joint prosthesis preferably adopts two types of cement fixation or titanium slurry spraying biological fixation for the tibia marrow cavity and the tibia marrow cavity fixing prosthesis handle.

Talus fuses artificial ankle joint prosthesis of surface type, preferably, talus surface prosthesis is formed by Ti6Al4V alloy powder through electron beam melting 3D printing technique production, talus surface prosthesis leave 3 nail holes of radiating direction be used for with the talus is fixed through the screw pressurization.

The artificial ankle joint prosthesis of the talus fusion surface type is characterized in that the contact surface of the talus surface prosthesis and the talus is preferably prepared into a porous metal bone trabecular structure with the pore size of 200-800 mu m and complete communication, and the porosity is 50-80%.

Due to the adoption of the technical scheme, the utility model has the following advantages:

1. the tumor type talus fusion surface type artificial ankle joint prosthesis provided by the utility model adopts a combined design, and the length of a tibial side component of the ankle joint prosthesis can be freely adjusted according to the resection range of a distal tibial tumor section of a patient, the skin defect condition and the soft tissue tension, so that the distal tibial defect section is individually reconstructed.

2. The utility model can rebuild the plantarflexion and dorsal extension functions of the tibialis-distal joint and rebuild the normal activity function of the ankle joint.

3. According to the utility model, the fusion rate between the prosthetic talus base and the host bone interface is improved through the pore structure designed by the 3D printing technology, so that an important basis is provided for good bone ingrowth and prosthetic stability.

Drawings

Fig. 1 is a schematic structural view of a tumor type talus fusion surface type artificial ankle joint prosthesis according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a surface replacement talus fusion surface type artificial ankle prosthesis according to an embodiment of the present invention.

The various reference numbers in the figures:

1-fixing a prosthesis handle in a medullary cavity of a tibia; 2-a prosthetic segment; 3-joint spacer; 4-talar surface prosthesis; 5-tibial medullary cavity; 6-talus.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated have no special meaning and are not to be construed as indicating or implying any relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model provides a talus fusion surface type artificial ankle joint prosthesis, which comprises: the upper end of the stem of the prosthesis is fixed in the medullary cavity of the tibia and is used for being fixedly connected with the medullary cavity of the tibia; the prosthesis segment is connected with the lower end of the fixed prosthesis handle in the marrow cavity of the tibia in a conical mode; the joint gasket is embedded at the lower end of the prosthesis segment, and the lower surface of the joint gasket is of a concave cambered surface structure; the upper surface of the talus surface prosthesis is of a polished convex cambered surface structure and is matched with the lower surface of the joint gasket in a form fit manner to form a smooth motion joint. The utility model can be widely applied to the bone defect reconstruction of limb continuous interruption after the resection of the distal tibia tumor, can realize the aim of limb structure recovery, and simultaneously realizes the perfect combination of instant stability and long-term stability of the tibialis distance joint, thereby obviously improving the function of the long-term ankle joint of a patient.

Hereinafter, a talar fusion surface type artificial ankle prosthesis according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The first embodiment is as follows:

fig. 1 shows a tumor type talus fusion surface type artificial ankle joint prosthesis, which is mainly suitable for bone defect reconstruction of limb continuity interruption after tibia distal end tumor resection, and comprises: the prosthesis handle 1 is fixed in the tibia medullary cavity, and the upper end of the prosthesis handle 1 is fixed in the tibia medullary cavity and is used for being fixedly connected with the tibia medullary cavity 5; the prosthesis segment 2 is connected with the lower end of the fixed prosthesis handle 1 in the marrow cavity of the tibia in a conical mode; the joint gasket 3 is embedded at the lower end of the prosthesis segment 2, and the lower surface of the joint gasket 3 is of a concave cambered surface structure; the talus surface prosthesis 4 is fixedly connected with the talus 6 at the lower part of the talus surface prosthesis 4, the upper surface of the talus surface prosthesis 4 is of a polished convex cambered surface structure and is matched with the lower surface of the joint liner 3 in a conformal manner to form a smooth motion joint, so that the plantar flexion and the dorsal extension functions of the tibialis-talus joint can be reconstructed, and the good recovery of the motion function of the ankle joint is realized.

In the above embodiment, preferably, the prosthesis segments 2 with different lengths can be freely selected according to the resection range of the patient tibia distal tumor segment, the skin defect condition and the soft tissue tension, so as to individually reconstruct the tibia distal defect segment.

In the above embodiment, the joint spacer 3 is preferably made of a high molecular polyethylene material.

In the above embodiment, the tibia intramedullary canal internal fixation prosthesis handle 1 and the tibia intramedullary canal 5 can be fixed by two types of cement fixation or titanium slurry spraying biological fixation.

In the above embodiment, preferably, the talus surface prosthesis 4 is produced by an Electron Beam Melting (EBM)3D printing technology from Ti6Al4V alloy powder, and the talus surface prosthesis 4 is provided with 3 radially-oriented nail holes for performing pressure fixation with the talus 6 through screws, so that the talus 6 bone can grow in conveniently, and long-term stability of the prosthesis can be realized.

In the above embodiment, preferably, the contact surface of the talus surface prosthesis 4 and the talus 6 is prepared with a porous metal bone trabecular structure with a pore size of 200-.

The second embodiment:

fig. 2 shows a surface replacement type artificial ankle joint prosthesis fused with a talus, which is mainly applicable to cases such as ankle injury and rheumatoid arthritis, and comprises: the prosthesis handle 1 is fixed in the tibia medullary cavity, and the upper end of the prosthesis handle 1 is fixed in the tibia medullary cavity and is used for being fixedly connected with the tibia medullary cavity 5; the joint gasket 3 is embedded at the lower end of the tibia bone marrow cavity fixed prosthesis handle 1, and the lower surface of the joint gasket 3 is of a concave cambered surface structure; the talus surface prosthesis 4 is fixedly connected with the talus 6 at the lower part of the talus surface prosthesis 4, the upper surface of the talus surface prosthesis 4 is of a polished convex cambered surface structure and is matched with the lower surface of the joint liner 3 in a conformal manner to form a smooth motion joint, so that the plantar flexion and the dorsal extension functions of the tibialis-talus joint can be reconstructed, and the good recovery of the motion function of the ankle joint is realized.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an artificial ankle joint prosthesis of talus fusion surface type, the bone defect that mainly is applicable to the limbs continuity and breaks down after the distal tumor of shin bone excision is rebuild, its characterized in that, this artificial ankle joint prosthesis includes:

the tibia marrow cavity internal fixation prosthesis comprises a tibia marrow cavity internal fixation prosthesis handle (1), wherein the upper end of the tibia marrow cavity internal fixation prosthesis handle (1) is used for being fixedly connected with a tibia marrow cavity (5);

the prosthesis segment (2) is connected with the lower end of the tibia marrow cavity fixed prosthesis handle (1) in a tapering mode;

the joint gasket (3) is embedded at the lower end of the prosthesis segment (2), and the lower surface of the joint gasket (3) is of a concave cambered surface structure;

the talus surface prosthesis comprises a talus surface prosthesis (4), wherein the lower part of the talus surface prosthesis (4) is fixedly connected with a talus (6), the upper surface of the talus surface prosthesis (4) is of a polished convex cambered surface structure and is matched with the lower surface of the joint liner (3) in a form fit mode to form a smooth motion joint.

2. The utility model provides an artificial ankle joint prosthesis of talus fusion surface type, mainly is applicable to ankle joint damage, rheumatoid arthritis's case, its characterized in that, this artificial ankle joint prosthesis includes:

the joint gasket (3) is embedded at the lower end of the tibia bone marrow cavity fixed prosthesis handle (1), and the lower surface of the joint gasket (3) is of a concave cambered surface structure;

the talus surface prosthesis comprises a talus surface prosthesis (4), wherein the lower part of the talus surface prosthesis (4) is fixedly connected with a talus (6), the upper surface of the talus surface prosthesis (4) is of a polished convex arc surface structure and is matched with the lower surface of the joint liner (3) in a shape fitting mode to form a smooth motion joint.

3. Talar fusion surface type artificial ankle prosthesis according to claim 1, characterized in that the prosthesis segments (2) of different lengths are freely chosen according to the resection scope of the patient's distal tibial tubercle segment, the condition of skin defects and the tension of the soft tissues.

4. The talus fusion surface type artificial ankle prosthesis according to claim 1 or 2, characterized in that the joint spacer (3) is made of a high molecular polyethylene material.

5. Talar fusion surface type artificial ankle prosthesis according to claim 1 or 2, characterized in that the shank intramedullary canal fixation prosthesis stem (1) and the shank intramedullary canal (5) are of the two types cement fixation or titanium slurry spray biological fixation.

6. Talar fusion surface type artificial ankle prosthesis according to claim 1 or 2, characterized in that said talar surface prosthesis (4) is produced from Ti6Al4V alloy powder by electron beam fusion 3D printing technique, said talar surface prosthesis (4) leaving 3 radial nail holes for the compression fixation with the talar (6) by means of screws.

7. The talus fusion surface type artificial ankle prosthesis according to claim 6, characterized in that the contact surface of the talus surface prosthesis (4) with the talus (6) is made of a porous metal bone trabecular structure having a pore size of 200-800 μm and being fully connected, and a porosity of 50-80%.