CN216702728U - Talus fusion surface type artificial ankle joint prosthesis - Google Patents

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 artificial ankle prosthesis

technical field

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

Background technique

The tibia is the second most common site of osteosarcoma after the femur. Tibial osteosarcoma accounts for about 19% of all osteosarcomas in the body, and 20% of tibial osteosarcomas occur in the distal tibia. The distal tibia is difficult to obtain a good tumor margin due to its many tendons, blood vessels, and nerves. Therefore, some scholars recommend below-knee amputation as the preferred surgical approach for distal tibial osteosarcoma. However, with the advancement of chemotherapy and surgical techniques, the limb salvage treatment of distal tibial osteosarcoma can also achieve a good survival rate, and is recognized and recommended by the majority of bone oncologists.

There are various reconstruction methods after resection of the distal tibial malignant tumor segment, including allogeneic bone reconstruction, autologous bone inactivation and replantation, vascularized fibula autograft, non-vascularized fibula autograft, and ankle prosthesis replacement. Allogeneic bone reconstruction has problems such as high risk of infection, allogeneic bone resorption and rejection, which increases the risk of complications such as wound infection. There are various methods of autologous bone inactivation and replantation. The three most commonly used inactivation methods at home and abroad are alcohol, liquid nitrogen and high temperature. Different inactivation methods have advantages and disadvantages in terms of complications. The ankle joint bears the whole body weight, and the normal activities of the ankle joint can complete the daily walking activities. Therefore, the reconstruction of the function of the ankle joint in patients with malignant tumors of the distal tibia is of great significance for the postoperative efficacy. The advantages of ankle fusion are that it can restore the continuity of the bony structure, provide good ankle stability, and reduce pain during weight bearing. However, in patients who rely on the plate-screw system to achieve distal tibia fixation and ankle joint fusion, along with the resorption of autologous bone after bone grafting, the incidence of postoperative inactivated autologous bone and large-segment allogeneic bone fractures can be increased. Although there are currently many reconstruction methods after resection of malignant tumor segments of the distal tibia, most of the reconstruction methods are at the expense of the ankle joint range of motion. For most patients, especially young patients, it is still difficult to sacrifice the normal ankle joint range of motion. accept. However, after resection of a large segment of distal tibial malignant tumor, a reconstruction method that can achieve a perfect combination of ankle joint stability and good range of motion is still a major challenge for bone oncologists.

Ankle arthroplasty is not as widely used as hip and knee arthroplasty, mainly due to long-term mechanical failure of the prosthesis and a high incidence of incisional complications. At the same time, the loosening and failure of the prosthesis after ankle replacement and the pain and swelling around the ankle seriously affect the postoperative function of patients. Studies have shown that the mechanical failure of the artificial ankle joint is largely caused by the collapse of the talus on the talus side of the prosthesis and bone resorption at the prosthesis-bone interface.

At present, 3D printing technology is widely used in the field of orthopedics. A large number of studies have shown that porous structure metals not only have good histocompatibility and ideal biomechanical structure, but also use 3D printing technology to individually replicate the structure and density of trabecular bone in patients to ensure ideal pores. The rate and pore diameter can facilitate the ingrowth of the host bone and provide the fusion rate of the prosthesis and the host bone. The advantage of artificial joint prosthesis for reconstruction of lower tibial bone defect is that the mechanical strength of metal is much better than that of allogeneic bone and inactivated bone, which can achieve early stabilization and reconstruct a movable ankle joint. But its disadvantage is also obvious, that is, it is difficult to achieve effective fusion between autologous bone and metal prosthesis. With the rapid development of digital orthopedics, 3D printing technology can solve this problem. In recent years, additive manufacturing technology has brought technological progress to the processing of individualized and customized artificial prostheses. The technical advantages of 3D printed artificial prostheses are mainly reflected in two aspects, one is conformal matching, and the other is bone integration function. For the repair and reconstruction of the distal tibia, 3D printing technology provides an ideal strategy. Through 3D printing, an artificial prosthesis for lower tibial defects with matching size and shape can be produced. On the contact interface between the talus surface prosthesis and the talus, a metal trabecular structure for bone ingrowth can be produced, which can realize the talus surface prosthesis and the talus. Bone fusion of autologous talus.

Utility model content

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

To achieve the above object, the utility model adopts the following technical solutions:

The first aspect of the present utility model provides an artificial ankle joint prosthesis of talus fusion surface type, which is mainly suitable for the reconstruction of bone defects in which the continuity of the limbs is interrupted after the tumor resection of the distal end of the tibia. The artificial ankle joint prosthesis includes: a fixed prosthesis handle, the upper end of the fixed prosthesis handle in the tibial intramedullary cavity is used for fast connection with the tibial intramedullary cavity; the prosthesis segment is conically connected to the lower end of the fixed prosthesis handle in the tibial intramedullary cavity; the joint lining A pad is embedded in the lower end of the prosthesis segment, and the lower surface of the joint pad is a concave arc structure; a talus surface prosthesis, the lower part of the talus surface prosthesis is fastened with the talus, and the talus The upper surface of the surface prosthesis is a polished convex arc structure and conformally matches with the lower surface of the joint pad to form a smooth kinematic joint.

The second aspect of the present utility model provides a talus fusion surface type artificial ankle joint prosthesis, which is mainly suitable for cases of ankle joint injury and rheumatoid arthritis. The artificial ankle joint prosthesis includes: a tibial intramedullary cavity fixation prosthesis A handle, the upper end of the tibial intramedullary canal fixation prosthesis handle is used for fast connection with the tibial intramedullary cavity; a joint pad is embedded in the lower end of the tibial intramedullary canal fixation prosthesis handle, and the joint pad is The lower surface is a concave arc structure; a talus surface prosthesis, the lower part of the talus surface prosthesis is tightly connected with the talus, and the upper surface of the talus surface prosthesis is a polished convex arc structure and is in contact with the joint pad. The lower surface is conformally matched to form a smooth kinematic joint.

For the talus fusion surface type artificial ankle joint prosthesis, preferably, the prosthesis segments of different lengths are freely selected according to the extent of resection of the distal tibia tumor segment of the patient, the condition of the skin defect and the tension of the soft tissue.

In the talus fusion surface type artificial ankle joint prosthesis, preferably, the joint pad is made of high molecular polyethylene material.

In the talus fusion surface type artificial ankle joint prosthesis, preferably, the tibial intramedullary canal fixation prosthesis handle and the tibial intramedullary canal are of two types: cement fixation or titanium slurry spraying biological fixation.

For the talus fusion surface type artificial ankle joint prosthesis, preferably, the talus surface prosthesis is produced from Ti6Al4V alloy powder by electron beam fusion 3D printing technology, and the talus surface prosthesis has three radial directions. The screw holes are used for compression fixation with the talus by screws.

In the talus fusion surface type artificial ankle joint prosthesis, preferably, the contact surface of the talus surface prosthesis and the talus is prepared with a porous metal trabecular structure with a pore size of 200-800 μm and complete communication, and the pores are The rate is 50%-80%.

The utility model has the following advantages due to the adoption of the above technical solutions:

1. The tumor-type talus fusion surface artificial ankle joint prosthesis provided by the utility model adopts a modular design, which can freely adjust the tibial side part of the ankle joint prosthesis according to the resection range of the distal tibia tumor segment of the patient, the skin defect and the soft tissue tension. length, so as to individualize the reconstruction of the distal tibial defect.

2. The utility model can reconstruct the plantar flexion and dorsiflexion functions of the tibiotalar joint, and reconstruct the normal activity function of the ankle joint.

3. The pore structure designed by the 3D printing technology of the present invention improves the fusion rate between the talus base of the prosthesis and the interface of the host bone, thereby providing an important foundation for good bone ingrowth and prosthesis stability.

Description of drawings

1 is a schematic structural diagram of a tumor-type talus fusion surface artificial ankle joint prosthesis provided in Embodiment 1 of the present utility model;

FIG. 2 is a schematic structural diagram of a surface replacement type talus fusion surface type artificial ankle joint prosthesis provided by Embodiment 1 of the present invention.

Each reference number in the figure:

1- Tibial intramedullary canal fixation prosthesis stem; 2- Prosthesis segment; 3- Joint pad; 4- Talus surface prosthesis; 5- Tibial medullary cavity; 6- Talus.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second" and other terms are used to define components, which are only for the convenience of distinguishing the above components. Unless otherwise stated, the above words have no special meaning and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installation", "arrangement" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The talus fusion surface type artificial ankle joint prosthesis provided by the utility model comprises: a tibial intramedullary fixation prosthesis handle, the upper end of the tibial intramedullary fixation prosthesis handle is used for fast connection with the tibia medullary cavity; a prosthesis segment , the taper is connected to the lower end of the fixed prosthesis stem in the tibia medullary cavity; the joint liner is embedded in the lower end of the prosthesis segment, and the lower surface of the joint liner is a concave arc structure; the talus surface prosthesis, the talus surface prosthesis The lower part of the talus is tightly connected with the talus, and the upper surface of the talus surface prosthesis is a polished convex arc structure and is conformally matched with the lower surface of the joint pad to form a smooth motion joint. The utility model can be widely used in the reconstruction of the bone defect in which the continuity of the limb is interrupted after the tumor resection of the distal end of the tibia. It can achieve the purpose of restoring the structure of the limb, and at the same time realize the perfect combination of immediate stability and long-term stability of the tibiotalar joint, so that the long-term stability of the patient can be achieved. Ankle function was significantly improved.

Below, the talus fusion surface type artificial ankle joint prosthesis provided by the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1:

Figure 1 shows a tumor-type talus fusion surface artificial ankle joint prosthesis, which is mainly suitable for the reconstruction of bone defects with interrupted limb continuity after tumor resection of the distal tibia. The tumor-type talus fusion surface artificial ankle joint prosthesis includes: Tibial intramedullary fixation prosthesis stem 1, the upper end of tibia intramedullary fixation prosthesis stem 1 is used to fasten connection with tibia medullary cavity 5; prosthesis segment 2, taper connected in tibia medullary cavity to fix prosthesis stem 1 The lower end of the joint pad 3 is embedded in the lower end of the prosthesis segment 2, and the lower surface of the joint pad 3 is a concave arc structure; Connection, the upper surface of the talus surface prosthesis 4 is a polished convex curved surface structure and conformally matches with the lower surface of the joint pad 3 to form a smooth kinematic joint, so that the plantar flexion and dorsiflexion functions of the tibiotalar joint can be reconstructed, and the ankle joint can be reconstructed. Good recovery of joint mobility.

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

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

In the above embodiment, preferably, the tibial intramedullary canal fixation prosthesis handle 1 and the tibial intramedullary cavity 5 can adopt two types of cement fixation or titanium slurry spraying biological fixation.

In the above embodiment, preferably, the talus surface prosthesis 4 is produced from Ti6Al4V alloy powder by electron beam melting (EBM) 3D printing technology, and the talus surface prosthesis 4 has three radially-directed nail holes for connecting with the talus 6 . Compression fixation is performed by screws to facilitate the ingrowth of the 6 talus and to achieve long-term stability of the prosthesis.

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 200-800 μm and complete communication, and the porosity is 50%-80%, so as to be The new bone tissue provides an ingrowth space, so that the new bone tissue can crawl into the pore structure, so that the talus surface prosthesis 4 can be bone-fused with the talus 6 .

Embodiment 2:

Figure 2 shows a surface replacement talus fusion surface artificial ankle joint prosthesis, which is mainly suitable for cases such as ankle joint injury and rheumatoid arthritis. The surface replacement talus fusion surface artificial ankle joint prosthesis includes: tibia Fixing the prosthesis handle 1 in the intramedullary cavity, the upper end of the tibial intramedullary fixation prosthesis handle 1 is used for fast connection with the tibial intramedullary cavity 5; the joint pad 3 is embedded in the lower end of the tibial intramedullary cavity fixing the prosthesis handle 1, And the lower surface of the joint pad 3 is a concave curved surface structure; the talus surface prosthesis 4, the lower part of the talus surface prosthesis 4 is tightly connected with the talus 6, and the upper surface of the talus surface prosthesis 4 is a polished convex curved surface structure and is connected with the talus 6. The lower surface of the joint pad 3 is conformally matched to form a smooth motion joint, so that the plantar flexion and dorsiflexion functions of the tibiotalar joint can be reconstructed, and a good recovery of the ankle joint motion function can be achieved.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit of the technical solutions of the embodiments of the present invention and range.

Claims (7)

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 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 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%.

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