CN215584480U

CN215584480U - 3D prints half ankle joint prosthesis of customization

Info

Publication number: CN215584480U
Application number: CN202121527769.0U
Authority: CN
Inventors: 闵理; 卢敏勋; 张瑀琦
Original assignee: West China Precision Medicine Industrial Technology Institute; West China Hospital of Sichuan University
Current assignee: West China Precision Medicine Industrial Technology Institute; West China Hospital of Sichuan University
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2022-01-21
Anticipated expiration: 2031-07-06

Abstract

The utility model discloses a 3D printing customized half ankle joint prosthesis, which comprises a tibia far-end prosthesis and a liner; the middle part of the tibia far-end prosthesis is a circular truncated cone, the lower part of the circular truncated cone is a supporting section, and a bone trabecula structure is arranged on the peripheral surface of the supporting section; the bottom of the supporting section is provided with a concave opening, and the two sides of the concave opening are respectively an outer ankle part and an inner ankle part; the pad is connected within a recessed opening in the bottom of the support section. The 3D printing customized semi-ankle joint prosthesis adopts a monopolar type, can retain the bone of a patient to the maximum extent, and has small prosthesis loosening and infection risk; the tibia far-end prosthesis with a solid structure guarantees the overall mechanical strength, the bone trabecula structure has good bone ingrowth and femoral crawling capabilities, the stability of the prosthesis is improved, the pad can buffer the impact of the prosthesis and the talus of a human body in the movement process, and the biomechanical requirements are met.

Description

3D prints half ankle joint prosthesis of customization

Technical Field

The utility model relates to the field of artificial prosthesis replacement, in particular to a 3D printing customized half ankle joint prosthesis.

Background

The distal tibia is one of the best sites for malignant bone tumors, and the ankle joint, which is the joint with the greatest weight bearing on the human body, is often also affected. After the distal tibiofibula is resected, conventional treatment methods include allogenic bone grafting, autologous fibula grafting, bone transportation, etc., but ankle fusion is not performed, i.e., ankle function is permanently lost, and only neutral position is maintained. The reconstruction of ankle prostheses is increasingly accepted by many people because they retain most of their ankle function. At present, common ankle joint prostheses are bipolar, namely a tibia far-end component and a talus component, the prostheses are complex to install, unnecessary bone loss of the talus is caused, and the risk of loosening and infection is high; the prior art prostheses are fixed using screw assemblies, with the risk of loosening of the prosthesis due to the backing-off of the screws. There is a need to develop a semi-ankle prosthesis that reconstructs the ankle joint while preserving its own talus, restores its function, and has high stability after implantation.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model aims to provide the 3D printed customized semi-ankle joint prosthesis which is designed in a single-pole manner, keeps the sclerotin of the prosthesis to the maximum extent and is stable after being implanted.

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

a 3D printed custom semi-ankle prosthesis comprising a distal tibial prosthesis, a liner; the middle part of the tibia far-end prosthesis is a circular truncated cone, the lower part of the circular truncated cone is a supporting section, and a bone trabecula structure is arranged on the peripheral surface of the supporting section; the bottom of the supporting section is provided with a concave opening, and the two sides of the concave opening are respectively an outer ankle part and an inner ankle part; the pad is connected within a recessed opening in the bottom of the support section.

Further, the center of supporting section spill mouth is provided with the recess, recess top a week is provided with the draw-in groove, the top of liner be provided with the boss of recess adaptation, boss top a week is provided with the buckle, connects in the draw-in groove through the buckle, connects the liner in the spill mouth of the support section bottom of shin bone distal end false body.

Preferably, the groove and the boss are in a runway shape.

Further, the tibia far-end prosthesis is of a solid structure, the trabecular bone structure is of a porous structure, and the trabecular bone structure is made of titanium alloy materials through 3D printing.

Preferably, the thickness of the trabecular bone structure is 2-4mm, and the porous gap is 0.2-0.6 mm.

Preferably, the material of the cushion is polyethylene, and the lower surface of the cushion is customized to match the talus of the patient.

Furthermore, a plurality of through holes are formed in the side walls of the external ankle part and the internal ankle part, and the through holes face the concave opening.

Furthermore, the upper part of the circular truncated cone of the tibia far-end prosthesis is an assembly section which is in a circular truncated cone shape.

Compared with the prior art, the utility model has the beneficial effects that:

1) the 3D printing customized half-ankle joint prosthesis device adopts a single-pole type, can reserve the bone of a patient to the maximum extent, and has small prosthesis loosening and infection risks;

2) the pad is firmly fixed with the tibia far-end prosthesis, the matching degree is good, and the through holes arranged on the lateral malleolus part and the medial malleolus part facilitate the fixation of ligaments and tendons in an operation and are beneficial to the postoperative recovery of a patient;

3) the tibia far-end prosthesis with a solid structure guarantees the overall mechanical strength, the bone trabecula structure has good bone ingrowth and femoral crawling capabilities, the stability of the prosthesis is improved, the pad can buffer the impact of the prosthesis and the talus of a human body in the movement process, and the biomechanical requirements are met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a left side view of the prosthesis depicted in FIG. 1;

FIG. 3 is a cross-sectional view A-A of the prosthesis shown in FIG. 2;

FIG. 4 is an enlarged partial view within the phantom outline of FIG. 3;

reference numerals: 1-tibial distal prosthesis, 2-trabecular bone structure, 3-spacer, 11-component segment, 12-support segment, 13-external ankle, 14-internal ankle, 15-through hole, 31-boss, 32-snap.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.

A 3D printed custom semi-ankle prosthesis comprising a distal tibial prosthesis 1, a liner 3; the middle part of the tibia far-end prosthesis 1 is a circular truncated cone, the upper part of the circular truncated cone is an assembly section 11, and the assembly section 11 is a circular truncated cone and is used for being arranged in a tibia marrow cavity of a human body; the lower part of the circular truncated cone is provided with a supporting section 12, and the outer peripheral surface of the supporting section 12 is provided with a bone trabecula structure 2; the bottom of the support section 12 is provided with a concave opening, and the two sides of the concave opening are respectively a lateral ankle part 13 and an internal ankle part 14; the pad 3 is attached in a recess in the bottom of the support section 12.

Specifically, the center of supporting section 12 spill mouth is provided with the recess, and recess top a week is provided with the draw-in groove, the top of liner 3 be provided with the boss 31 of recess adaptation, boss 31 top a week is provided with buckle 32, connects in the draw-in groove through buckle 32, connects liner 3 in the support section 12 bottoms of shin bone distal end prosthesis 1, and is preferred, recess and boss 31 are the runway type, and shape adaptation shin bone distal end prosthesis ensures joint strength on the one hand, and on the other hand can avoid liner 3 to rotate, and the matching degree is good.

Specifically, the tibia far-end prosthesis 1 is made of a titanium alloy material, the tibia far-end prosthesis 1 and the trabecular bone structure 2 are both made by 3D printing, the tibia far-end prosthesis is of a solid structure, the trabecular bone structure is of a porous structure, the thickness of the trabecular bone structure is 2-4mm, and the porous gap is 0.2-0.6 mm; the tibia far-end prosthesis with a solid structure can ensure the overall mechanical strength, and the bone trabecula structure with a porous structure has good bone ingrowth and bone crawling capabilities, so that the stability of the prosthesis can be improved; the lower surface of the pad 3 is customized according to the talus of a patient, and the matching degree is high; the liner 3 is made of polyethylene, and the high-density and wear-resistant characteristics of the polyethylene material with the buffer effect can relieve the impact of the prosthesis and the talus of a human body in the movement process, so that the liner meets the biomechanical requirement.

Further, a plurality of through holes 15 are formed in the side walls of the outer ankle part and the inner ankle part, the through holes face the concave openings, the through holes 15 are used for suturing and fixing ligaments or tendons to repair or rebuild joint capsules, operation is facilitated, and meanwhile postoperative recovery of a patient is facilitated.

The artificial body is suitable for ankle joint artificial body replacement of a patient with tibia far-end resection, the assembly section is implanted into a tibia medullary cavity, the single-pole structure is simple to install, the talus of the patient can be reserved to the greatest extent, and the risk of infection and artificial body loosening is reduced; the pad is firmly fixed with the tibia far-end prosthesis, the matching degree is good, and the through holes arranged on the lateral malleolus part and the medial malleolus part facilitate the ligament and tendon fixation in the operation and are beneficial to the postoperative recovery of a patient; the tibia far-end prosthesis of the solid structure guarantees the overall mechanical strength, the bone trabecula structure has good bone growth and femoral crawling capacity, the stability of the prosthesis is improved, the liner can buffer the impact of the prosthesis and a human talus in the motion process, and the biomechanical requirement is met.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model.

Claims

1. A 3D printed customized semi-ankle prosthesis comprising a distal tibial prosthesis (1), a pad (3); the method is characterized in that: the middle part of the tibia far-end prosthesis (1) is a circular truncated cone, the lower part of the circular truncated cone is a supporting section (12), and a bone trabecula structure (2) is arranged on the peripheral surface of the supporting section (12); a concave opening is formed in the bottom of the supporting section (12), and a lateral malleolus portion (13) and a medial malleolus portion (14) are respectively arranged on two sides of the concave opening; the pad (3) is connected in a recess in the bottom of the support section (12).

2. The 3D printed custom semi-ankle prosthesis of claim 1, wherein: the center of supporting section (12) spill mouth is provided with the recess, recess top a week is provided with the draw-in groove, the top of liner (3) be provided with boss (31) of recess adaptation, boss (31) top a week is provided with buckle (32), connects in the draw-in groove through buckle (32), connects liner (3) in the spill mouth of supporting section (12) bottom of shin bone distal end prosthesis (1).

3. The 3D printed custom semi-ankle prosthesis of claim 2, wherein: the groove and the boss (31) are in a runway shape.

4. The 3D printed custom semi-ankle prosthesis of claim 1, wherein: the tibia far-end prosthesis (1) is of a solid structure, the trabecular bone structure (2) is of a porous structure, and the trabecular bone structure is made of titanium alloy materials through 3D printing.

5. The 3D printed custom semi-ankle prosthesis of claim 4, wherein: the thickness of the bone trabecular structure (2) is 2-4mm, and the porous clearance is 0.2-0.6 mm.

6. The 3D printed custom semi-ankle prosthesis of claim 1, wherein: the material of the pad (3) is polyethylene, and the lower surface of the pad is customized according to the talus match of the patient.

7. The 3D printed custom semi-ankle prosthesis of claim 1, wherein: the lateral walls of the external ankle part (13) and the internal ankle part (14) are provided with a plurality of through holes (15) which face the concave openings.

8. The 3D printed custom semi-ankle prosthesis of any of claims 1-7, wherein: the upper part of the circular truncated cone of the tibia far-end prosthesis (1) is an assembly section (11), and the assembly section (11) is in a circular truncated cone shape.