CN219126892U

CN219126892U - 3D prints local ankle joint false body

Info

Publication number: CN219126892U
Application number: CN202222593986.0U
Authority: CN
Inventors: 付宗然; 岳术俊; 许奎雪; 魏章利; 荀世界
Original assignee: Xingtai Langtai Benyuan Medical Instrument Co ltd
Current assignee: Xingtai Langtai Benyuan Medical Instrument Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-06-06
Anticipated expiration: 2032-09-29

Abstract

The utility model discloses a 3D printing local ankle joint prosthesis, belonging to the technical field of medical prostheses; the ankle joint comprises a solid part, wherein the solid part is an ankle joint lesion part resected by a patient; a bone trabecula structure is arranged between the solid part and the rest healthy ankle joint of the patient; the solid part is fixed with the rest ankle joint of the patient through a suture and a screw; the joint surface of the solid structure is provided with a polyethylene layer. The utility model does not need to replace larger healthy bone, only directly replaces the affected part of the bone, greatly reduces the operation time, reserves more bone for local patients of the bone as much as possible, and is more beneficial to recovering the joint function.

Description

3D prints local ankle joint false body

Technical Field

The utility model relates to the technical field of medical prostheses, in particular to a 3D printing local ankle prosthesis.

Background

Chinese patent CN 113440321a discloses a wing type adjustable tumor half ankle joint prosthesis with inner and outer malleoli. 1. The existing semi-condylar prosthesis has large resected healthy bone area, and can not meet the design concept that some clinical subjects want to reserve more bone for patients. 2. The existing semi-condylar prosthesis has larger surgical incision, and longer time for recovering joint function caused by larger wound to patients. 3. The prior semi-condylar prosthesis needs to stretch the skin of a patient in the assembly, installation and implantation process, which causes damage to soft tissues of the patient and has poor joint recovery effect after operation. 4. The existing semi-condylar prosthesis joint surface is made of metal materials, and abrasion to residual bone is large in the later period of operation.

Disclosure of Invention

In view of this, the present utility model provides a 3D printed partial ankle prosthesis; the method does not need to replace larger healthy bones, only aims at the direct replacement of the affected parts of bones, greatly reduces the operation time, reserves more bones for local patients of bones as much as possible, and is more beneficial to recovering the joint function.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a 3D printed partial ankle prosthesis comprising a solid portion, the solid portion being an ankle diseased portion resected by a patient; a bone trabecula structure is arranged between the solid part and the rest healthy ankle joint of the patient; the solid part is fixed with the rest ankle joint of the patient through a suture and a screw; the joint surface of the solid structure is provided with a polyethylene layer.

Further, the screw hole is a countersunk hole, and the screw is a countersunk screw.

Further, the solid portion is provided with a screw hole and a suture hole.

Further, the screw hole is located at the distal tibia end on the solid structure; the suture hole is located on the proximal tibia of the solid structure.

Further, the trabeculae contacting the remaining healthy ankle joint of the patient have a porosity of 50% -80% and a pore size of 10 μm to 200 μm.

The beneficial effects generated by adopting the technical scheme are as follows:

1. the utility model solves the problem of bone replacement of the semi-condylar prosthesis, does not need to replace larger healthy bone, only aims at direct replacement of the affected part of the bone, greatly reduces the operation time, reserves more bone as much as possible for the local affected part of the bone, and is more beneficial to recovering the joint function.

2. The incision is relatively smaller in the operation, the exposure area of human soft tissues in the air is small, and the operation time is short; in order to increase the stability surface of the later-stage prosthesis, a 3D printing bone trabecular structure is adopted, and the bone trabecular structure has the advantages of promoting bone ingrowth and shortening the later-stage joint function recovery time of a patient.

3. The utility model can be designed to be of corresponding size according to the bone fracture, and can avoid damage to soft tissues of a patient caused by stretching the skin of the patient in the process of installing the prosthesis.

4. The utility model adopts the polyethylene pad at the joint surface, and has little abrasion to the rest bone surface.

Drawings

Fig. 1 is a schematic side view of an embodiment of the present utility model.

Fig. 2 is a schematic front view of an embodiment of the present utility model.

Fig. 3 is a schematic diagram of a back structure of an embodiment of the present utility model.

Fig. 4 is a schematic view showing the positions of the suture hole and the screw hole according to the embodiment of the present utility model.

In the figure: 1-polyethylene pad, 2-solid part, 3-bone trabecular structure.

Detailed Description

The utility model will be further described with reference to the drawings and detailed description.

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly described below, and it will be apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

A 3D printed partial ankle prosthesis comprising a 3D solid portion, the solid portion being an ankle lesion resected by a patient; a bone trabecula structure is arranged between the solid part and the rest healthy ankle joint of the patient; the solid part is fixed with the rest ankle joint of the patient through a suture and a screw; the joint surface of the solid structure is provided with a polyethylene layer.

Further, the solid portion is provided with a screw hole and a suture hole.

The following is a more specific example:

referring to fig. 1 to 4, the prosthesis of the present embodiment is a 3D printed product, and the prosthesis is driven and fixed at the grooves (including 201, 202, 203, 204 in fig. 4) by using screws; soft tissue is secured by suturing with sutures through suture holes (including 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215 in fig. 4).

The local 3D printing ankle joint replacement prosthesis is formed by 3D printing, can be accurately matched with the defect primitive bone according to the osteotomy quantity of different patients, and has the characteristics of high strength and light specific gravity;

the bone on the outer surface of the prosthesis is Liang Zhanbi percent, the soft tissue contacts the trabecular region of the bone on the surface, the porosity is 50 percent to 80 percent, and the pore diameter is set to be 10 to 200 mu m.

The technology can avoid the soft tissue strain of the patient caused by bone replacement, reduce the infection risk caused by long operation time, stabilize the prosthesis according to the screw fixation and the soft tissue suture at the early stage of the implant of the prosthesis after the operation, integrate the bone growth effect with the bone mass of the human body according to the bone trabecula at the later stage, effectively stabilize the prosthesis, shorten the time for recovering the joint function of the patient and greatly improve the joint function recovery effect of the patient.

For benign tumors or patients who want to reserve redundant bones, multiple bone cuts are not needed, healthy bones are reserved, and as the bone cuts are directly carried out on the affected parts of the bones to replace the prosthesis, the damage to soft tissues of the patients caused by stretching can be reduced, the prosthesis is fixed in a butt joint way with the residual bones after the bone cuts are cut, the operation time is shortened, and the infection risk is reduced;

the local 3D printing ankle joint replacement prosthesis adopts a 3D printing technology and is matched with a high polymer polyethylene cushion block, the prosthesis adopts screws and suture lines to stitch soft tissues for fixation (figure 3), a 3D printing bone trabecula structure is added, the human bone trabecula structure is an extension part of cortical bone in cancellous bone, and the bone is in an irregular three-dimensional grid structure, so that the effect of supporting hematopoietic tissues is achieved. The trabecula structure of human bone is different in the same position and different in physical state, and the trabecula of human bone has the separation of tensile trabecula and pressure trabecula. The natural trabecular structure of human bone is the result of human evolution, with profound biomechanical causes and cellular ingrowth.

Research surface, high bone small Liang Kongxi rate and connectivity can improve bone formation level, the bone is most suitable for bone ingrowth when the aperture is 300-400 mu m, bone ingrowth is fastest when the aperture is 100-200 mu m, gradient multistage holes have positive effects on differentiation of bone marrow stem cells and regeneration of soft tissues, rough porous surface can well induce generation of ectopic bone, and adhesion, proliferation and differentiation capability of osteoblasts can be improved. The research surface shows that when the internal fixation micro-motion range is smaller than 28 μm, the requirement of biological fixation bone ingrowth can be met, and when the micro-motion is larger than 150 μm, soft tissue films can be generated at the interface between the prosthesis and the bone, and the fixation effect is affected. The surface roughness on the macro scale can greatly reduce micro-motion, is beneficial to the quick and good ingrowth of soft tissues and bones, and can recover the joint function more quickly, the soft tissues, bones and the prosthesis are fused into a whole in the past for a long time, the joint function recovery effect is excellent, the prosthesis in a bone cement fixing mode is easy to loosen due to the daily life behaviors of a patient, and the joint function effect recovered by the prosthesis is greatly reduced;

the prosthesis has relatively small incision in operation, and can also avoid infection caused by long-time exposure of large-area human soft tissue to air.

The joint surface is made of polyethylene cushion blocks to prevent the abrasion of the talus slide surface. The osteotomy guide plate is adopted to accurately find the osteotomy position, the osteotomy position has a slight inclination, the prosthesis is embedded into bone, the prosthesis is not easy to fall off, and the early-stage stability of the prosthesis after operation is improved. The prosthesis adopts a cortical bone nail fixing mode, and the prosthesis is driven into and penetrates through cortical bone from one side of the prosthesis, so that the overall stability after operation is improved due to high cortical bone hardness.

Claims

1. A 3D printed partial ankle prosthesis comprising a 3D solid portion, wherein the solid portion is an ankle lesion resected by a patient; a bone trabecula structure is arranged between the solid part and the rest healthy ankle joint of the patient; the solid part is fixed with the rest ankle joint of the patient through a suture and a screw; the joint surface of the solid part is provided with a polyethylene layer.

2. The 3D printed partial ankle prosthesis of claim 1 wherein the solid portion is provided with screw holes and suture holes.

3. The 3D printed partial ankle prosthesis of claim 2 wherein the screw holes are countersunk holes and the screws are countersunk screws.

4. The 3D printed partial ankle prosthesis of claim 2 wherein the screw hole is located on the distal tibia of a solid structure; the suture hole is located on the proximal tibia of the solid structure.

5. A 3D printed partial ankle prosthesis according to claim 1, wherein the bone trabeculae in contact with the remaining healthy ankle of the patient have a porosity of 50% -80% and a pore size of 10 μm to 200 μm.