CN204636623U - 3D metal embedded bone trabecula intervertebral fusion device - Google Patents

Abstract

The utility model provides an intervertebral fusion device, the outline of which is designed as a kidney-shaped entity, and the fusion surface of the main body and the vertebral body is a 3D metal bone trabecular structure that facilitates the growth of bone cells. The fusion device is put into the damaged intervertebral disc of the host that has been taken out, and the upper and lower adjacent healthy vertebral bodies of the host are connected and fixed by the posterior screw rod system. The utility model 3D metal trabecular intervertebral fusion device has good immediate postoperative Stability and good bone fusion, effective anti-subsidence, simple and reliable operation.

Description

3D Metal Trabecular Intervertebral Fusion Cage

technical field

The utility model relates to an orthopedic surgical implant, in particular to an intervertebral fusion device used for intervertebral fusion.

Background technique

Intervertebral disc degenerative disease is a common orthopedic disease. Modern medicine has implemented intervertebral fusion surgery to treat intervertebral disc degenerative disease. Implants need to cooperate with bone grafts to achieve intervertebral fusion, while the current conventional method in the medical field is intervertebral implantation of autologous bone or allogeneic bone, built-in metal supporter or intervertebral fusion device, etc. However, due to the limited source of autologous bone, allograft bone is expensive and has biological risks, so not every patient who needs bone defect filling can receive satisfactory treatment; Constraints, the implanted support or intervertebral fusion device has a limited diameter and cannot provide large-area support, and it is prone to subsidence of the lamina after surgery, resulting in secondary narrowing of the intervertebral space.

Contents of the invention

The purpose of this utility model is to provide a 3D metal trabecular intervertebral fusion device that can be used for filling and supporting fusion in the fusion operation of intervertebral disc degeneration. The 3D metal trabecular intervertebral fusion device has a kidney-shaped outline design , which has a 3D metal trabecular bone structure similar to human cancellous bone. During surgery, you can choose a suitable size 3D metal trabecular bone fusion cage to fill the vertebral space and provide support according to the needs of the cone gap. The 3D metal trabecular bone structure used in the fusion surface of the vertebral body has a rough surface similar to the cancellous bone structure and is embedded in the upper and lower vertebral bodies, providing an initial stabilizing function for the implanted intervertebral fusion cage to form a pair With the support of the upper and lower vertebral bodies, bone cells and tiny blood vessels crawl and grow in along the micropores of the 3D metal trabecular structure during the patient's rehabilitation process, and finally form an active fusion embedded intervertebral fusion cage.

In order to achieve the above object, the utility model takes the following design scheme:

The 3D metal trabecular intervertebral fusion device is characterized in that the outer contour of the 3D metal trabecular intervertebral fusion device is kidney-shaped, and the inside has a 3D metal trabecular structure similar to human cancellous bone. Flat design, when in use, place the 3D metal trabecular intervertebral fusion cage at the upper and lower vertebral body spaces.

The 3D metal trabecular intervertebral fusion device is characterized in that the 3D metal trabecular intervertebral fusion device has a structure similar to human cancellous bone, and its diameter is 0.10 to 2 mm. When the 3D metal trabecular intervertebral fusion device is After implanting in the intervertebral space, the rough surface of the 3D metal trabecular structure used in the fusion surface of the vertebral body is embedded with the upper and lower vertebral bodies to form an initial positioning.

The 3D metal trabecular intervertebral fusion device is characterized in that it is made of medical metals, including but not limited to titanium and titanium alloys, cobalt alloys, stainless steel, tantalum metals, and magnesium alloys.

The surface of the 3D metal trabecular intervertebral fusion device is entirely or partially coated with hydroxyapatite, and the hydroxyapatite coating has the function of inducing bone cell growth.

The processing method of the 3D metal trabecular intervertebral fusion device is as follows: high-energy electron beam fusion molding technology is used; the hydroxyapatite coating is obtained by high-temperature spraying or electrochemical deposition.

The utility model has the advantages of:

1. The 3D metal trabecular intervertebral fusion device of this utility model has a kidney-shaped outer contour and a 3D metal trabecular bone structure similar to human cancellous bone. 12mm to provide a variety of filling sizes for various intervertebral space sizes.

2. The 3D metal trabecular intervertebral fusion device of this utility model, when in use, the doctor selects a 3D metal trabecular intervertebral fusion device of appropriate length and height according to the needs and fills it in the space between the vertebral bodies to obtain the initial stability of the vertebral body. During the postoperative recovery period, the surrounding bone and the 3D metal trabecular intervertebral fusion cage can be fused and grown together to form a relatively stable and bioactive support structure. At the same time, this support structure can also cause damage to the surrounding blood supply. Stimulation to promote the repair of damaged cartilage. Since the use of 3D metal trabecular bone intervertebral fusion partially replaces autologous bone and allogeneic bone, it can greatly reduce the economic burden of patients and overcome the difficulties and shortages in the quantity of autologous bone and allogeneic bone to a certain extent; at the same time, 3D metal bone The spinous process structure of the trabecular intervertebral fusion cage will be inserted into the bone tissue around the defect cavity to form an initial positioning, and the supporting force for the cartilage generated by this initial positioning is much greater than that of traditional bone block and bone particle filling The supporting force of the method; the patient's own bone crushed particles and bone cement can be obtained through necessary osteotomy, bone drilling and other operations during the operation.

3. The 3D metal trabecular intervertebral fusion device of the present invention has a hydroxyapatite coating on all or part of the surface of its granules, and the hydroxyapatite coating has the function of inducing bone cell growth.

4. The 3D metal trabecular intervertebral fusion device of this utility model is made of medical metals, including but not limited to titanium and titanium alloys, cobalt alloys, stainless steel, tantalum metals, and magnesium alloys. Such metal materials The biocompatibility of the biocompatibility has been confirmed by the practice of orthopedic implant applications at home and abroad for many years.

5. The processing method of the 3D metal trabecular intervertebral fusion device is: using laser or high-energy electron beam rapid prototyping technology, high temperature sintering, chemical corrosion, electrochemical deposition and other technologies, other processing methods also include precision casting, Welding, mechanical cutting, electrical discharge machining, etc.; hydroxyapatite coating is obtained by high temperature spraying or electrochemical deposition.

The high-energy electron beam rapid prototyping technology is used, and its processing method is as follows:

1) Design and build a three-dimensional data model of the 3D metal trabecular intervertebral fusion device in the computer;

2) Use professional software to layer the 3D data model to obtain the contour data of a series of single-layer slices;

3) Input the above-mentioned series of ply data to the high-energy electron beam rapid prototyping equipment;

4) In the processing cabin of the high-energy electron beam rapid prototyping equipment, metal powder with a thickness corresponding to the layer height when the aforementioned three-dimensional data model is layered is laid;

5) The computer controls the high-energy electron beam to scan and selectively melt the metal powder;

6) repeating the steps of laying the powder and scanning the melting so that the materials selected for melting of each layer are mutually sintered into a whole;

7) After the melting process of all layers is completed, the unfused powder is removed to obtain a 3D metal trabecular intervertebral fusion cage with the required shape and structure.

At present, the typical metal rapid prototyping processing equipment includes: EBM A1 and A2 electron beam melting system of Swedish ARCAM company.

The above-mentioned other various processing methods are all well-known and mature technologies in the metal processing industry, so no further elaboration will be made in this specification.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment

Fig. 2 is a schematic diagram of filling in the intervertebral space according to the embodiment of the present invention

Detailed ways

Below in conjunction with accompanying drawing, the specific implementation of the present utility model is described in further detail.

As shown in Fig. 1 and Fig. 2, the 3D metal trabecular intervertebral fusion device (1) of the present invention has a kidney-shaped outer contour and has a 3D metal trabecular bone structure (2) similar to human cancellous bone. The 3D metal trabecular bone intervertebral fusion cage (1) has an external profile length of 26-28mm and a height of 7-12mm, and the micropore diameter of the 3D metal trabecular bone structure (2) is 0.10-2mm. The beam structure (2) is a cancellous bone structure that facilitates bone ingrowth, so its cross-section can be of any shape,

During the operation, the intervertebral disc (3) in the intervertebral space is removed first, and then the 3D metal trabecular intervertebral fusion cage (1) is placed in the intervertebral space where the intervertebral disc is removed to provide initial support stability and later bone ingrowth and fusion At the same time, the screw-rod system (4) of the pedicle is used for auxiliary fixation and support.

The processing method of the utility model 3D metal trabecular intervertebral fusion device (1) is: using high-energy electron beam rapid prototyping technology, other processing methods also include precision casting, welding, mechanical cutting, electrical discharge machining, etc., hydroxyapatite The stone coating is obtained by high-temperature spraying or electrochemical deposition. The above-mentioned processing methods are quite mature processing methods, and there is no technical difficulty in application.

The utility model 3D metal trabecular intervertebral fusion device is made of medical metals, which include but not limited to titanium and titanium alloys, cobalt alloys, stainless steel, tantalum metals, and magnesium alloys. Such metal materials are listed in ISO The -583 series of international standards have provisions, and its biocompatibility has been confirmed by many years of practice in orthopedic implant applications at home and abroad.

Claims (3)

1. A 3D metal trabecular intervertebral fusion device, characterized in that the outer contour of the 3D metal trabecular intervertebral fusion device (1) is kidney-shaped, and the length of the contour size is 26 to 28 mm, and the height is 7 to 7 mm. 12mm. 2. The 3D metal trabecular intervertebral fusion device according to claim 1, characterized in that the 3D metal trabecular intervertebral fusion device (1) has a 3D metal trabecular structure similar to human cancellous bone. 3. The 3D metal trabecular intervertebral fusion device according to claim 1, characterized in that the 3D metal trabecular intervertebral fusion device (1) has a structure similar to human cancellous bone, and its diameter is 0.10-2mm.