3D printing bionic semi-cone

Abstract

The 3D printing bionic semi-vertebral body comprises a prosthesis main body, a conical rotary knob and a distraction rod, an integrally-formed upper convex face is arranged on the top face of the prosthesis main body, the prosthesis main body is used for being implanted into the cut lower vertebra of the human body, the upper convex face is tightly attached to the upper vertebra of the human body, a rotary knob hole is formed in the prosthesis main body, and the conical rotary knob is arranged in the rotary knob hole. The conical knob is arranged in the knob hole in a rotating mode, a guide hole communicated with the knob hole is formed in the side wall of the prosthesis body, the distraction rod is inserted into the guide hole in a sliding mode, and the end of the distraction rod is matched with the peripheral wall of the conical knob in an abutting mode. The conical knob is rotated to push the distraction rod to slide along the guide hole, so that the other end of the distraction rod abuts against the lower vertebra of the human body. The device is simple in structure, does not need to be assembled for many times, is low in cost, improves the movement intensity and firmness of the bionic cervical intervertebral joint, and improves the success rate of an operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical prostheses, and in particular to a 3D printed bionic hemivertebra. Background Art

[0002] The incidence of cervical spondylosis is increasing year by year, and tends to be younger. Artificial disc replacement is one of the commonly used treatment options, but the traditional artificial disc prosthesis has a cumbersome product structure, a single size selection, and cannot be adjusted according to each patient; the product has poor fatigue and wear resistance, and has extremely poor biocompatibility with the original vertebral tissue, leading to problems such as the detachment of the artificial prosthesis. 3D printing technology is a type of rapid prototyping technology. It is a technology based on digital models, using powdered metal or plastic and other bondable materials to construct objects by stacking layer by layer, so it can print many complex structures. The bionic cervical intervertebral joint based on 3D printing can be well combined with the patient's vertebrae, and can almost meet the personalized needs of all patients, but the design structure of the related 3D printed bionic cone is still relatively complex, and there are pain points that are not conducive to large-scale production and surgical operations.

[0003] For example, most existing bionic vertebral bodies use a multi-component prosthesis, which includes an upper end plate, a nucleus pulposus, and a lower end plate. The lower surface of the upper end plate and the upper surface of the nucleus pulposus form a ball-and-socket joint, and the lower surface of the nucleus pulposus fits with the upper surface of the lower end plate. The ball-and-socket joint is composed of a spherical groove formed on the lower surface of the upper end plate and a spherical dome protruding from the upper surface of the nucleus pulposus, so that the upper end plate can achieve free movement in six directions relative to the nucleus pulposus: flexion / extension, left / right bending, and left / right rotation, so that the nucleus pulposus can move in the front, back, left, and right directions and rotate around the central axis on the upper surface of the lower end plate, and is not easy to fall out. However, this structure usually has problems such as prosthesis collapse, nucleus pulposus leakage, and reduced mobility, which makes it difficult to use the artificial intervertebral disc prosthesis stably for a long time and requires regular replacement. Secondary surgery will bring more health and economic losses to patients. In addition, the upper end plate and the lower end plate of some multi-component prostheses are mostly fixed to the human vertebrae by cross-connection with screws, which not only makes the implantation of the prosthesis more complicated, but also easily causes secondary injuries to the patient. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a 3D printed bionic half vertebra, which has a simple structure, does not require multiple assembly, has low cost, improves the movement strength and firmness of the bionic cervical intervertebral joint, and improves the success rate of the operation.

[0005] To achieve the above-mentioned purpose, the present invention discloses a 3D printed bionic hemivertebra, comprising a prosthesis body, a conical knob, and a spreader rod, wherein the top surface of the prosthesis body is provided with an integrally formed upper convex surface, the prosthesis body is used to implant the cut-off part of the lower vertebra of the human body, and the upper convex surface is tightly fitted with the upper vertebra of the human body, a knob hole is provided on the prosthesis body, the conical knob is screwed into the knob hole, a guide hole connected to the knob hole is provided on the side wall of the prosthesis body, the spreader rod is slidably inserted into the guide hole, and the end of the spreader rod is abutted against the peripheral wall of the conical knob, and the spreader rod is pushed to slide along the guide hole by rotating the conical knob so that the other end of the spreader rod is against the lower vertebra of the human body.

[0006] Furthermore, the knob hole includes a tapered portion and a threaded portion, the tapered portion is arranged at the front end of the prosthesis body and is connected to the guide hole, and the threaded portion is arranged at the rear end of the tapered portion.

[0007] Furthermore, the conical knob includes a conical head and a screw, the screw is threadedly connected to the threaded portion, the conical head is screwed into the conical portion, and the end of the expansion rod has a recess matching the conical head, so that the expansion rod slides toward both sides under the rotational force of the conical head.

[0008] Furthermore, a guide groove is provided on the inner wall of the guide hole, and a guide block slidably matched with the guide groove is provided on the peripheral wall of the expansion rod, thereby ensuring that the expansion rod slides more stably in the guide groove, avoiding deflection, and ensuring the stability of the fixation of the prosthesis body.

[0009] Furthermore, the surface of the prosthesis body has a porous structure through 3D printing, and the thickness of the porous structure is 0.3mm-1mm. Therefore, the porous structure is 3D printed on the surface of the prosthesis body using SLM technology, so that the prosthesis body as a whole is a solid structure, which is beneficial to bone fusion and ensures the strength of the bionic cervical intervertebral joint.

[0010] Furthermore, the diameter of the upper end of the prosthesis body is 13mm-16mm, and the diameter of the lower end of the prosthesis body is 6mm-8mm.

[0011] Furthermore, first planes are arranged on both sides of the upper part of the prosthesis body, and a second plane is arranged on the rear side of the prosthesis body, so that the prosthesis body can better match and fuse with the lower vertebrae of the human body, and the prosthesis body is not easily displaced after implantation.

[0012] Furthermore, the diameter of the upper convex surface is greater than the diameter of the prosthesis body, and can cooperate with the patient's vertebrae to play a stabilizing role.

[0013] Furthermore, the surface of the porous structure is coated with a coating, thereby increasing the wear resistance of the porous structure and improving its bone fusion ability by adding the coating.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The prosthesis of the present invention adopts an integrated design and does not require assembly. After the prosthesis is implanted in the lower vertebra of the human body, the upper convex surface on the prosthesis fits tightly with the upper vertebra of the human body, thereby realizing multi-degree-of-freedom twisting and tilting movements. This not only greatly simplifies the structure of the prosthesis and reduces production costs, but also facilitates large-scale production. (2) The present invention uses a conical knob as a force point to push the expansion rod to expand horizontally to the left and right, so that the expansion rod supports the lower vertebra of the human body, thereby fixing the prosthesis on the lower vertebra of the human body. Compared with the traditional screw fixing method, the horizontal expansion fixing method of the present invention is simpler, avoids secondary damage to the patient, and greatly improves the success rate of the operation. (3) The end surface is a porous structure with customizable thickness, and the interior is a solid structure, which is beneficial to bone fusion and ensures the strength of the prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall structural front view of the present invention; Figure 2 It is a structural schematic diagram of the knob hole; Figure 3 It is a schematic diagram of the structure of the knob hole and the guide hole; Figure 4 It is a side view of the overall structure of the present invention; Figure 5 It is a half-section diagram of the overall structure of the present invention; Figure 6 It is a schematic diagram of the overall structure of the tapered knob; Figure 7 The main view of the overall structure of the prosthesis body implanted into the human vertebra; Figure 8 A side view of the overall structure of the prosthesis body implanted into the human vertebra. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Reference Figure 1-Figure 3As shown, a 3D printed bionic hemivertebra includes a prosthesis body 1, a conical knob 2, and a spreader rod 3. The top surface of the prosthesis body 1 is provided with an integrally formed upper convex surface 4, wherein the upper convex surface 4 is hemispherical as a whole. In this embodiment, osteotomy is performed according to the condition of different patients (here, the lower vertebra of the human body is taken as an example), and the prosthesis body 1 is 3D printed according to the range of osteotomy, and then the prosthesis body 1 is implanted into the cut-off part of the lower vertebra C1 of the human body, and the upper convex surface 4 is in close contact with the upper vertebra C2 of the human body (such as Figure 7 , Figure 8 As shown in the figure, the diameter of the upper convex surface 4 is larger than the diameter of the prosthesis body 1, so that it can cooperate with the upper vertebra of the human body, and can realize twisting and tilting movements with multiple free angles. In order to ensure the stability of the prosthesis body 1, a knob hole 11 is provided on the prosthesis body 1, and the conical knob 2 is screwed into the knob hole 11. The side wall of the prosthesis body 1 is provided with a guide hole 12 connected to the knob hole 11. The spreader rod 3 is a pair and is slidably inserted into the guide hole 12 respectively, and the end of the spreader rod 3 is in contact with the surrounding wall of the conical knob 2. The spreader rod 3 is pushed to slide along the guide hole 12 by rotating the conical knob 2, so that the other end of the spreader rod 3 is against the lower vertebra of the human body, thereby playing a stabilizing role.

[0018] It is further explained that in this embodiment, the material of the prosthesis main body 1 is preferably Ti6Al4V-ELI, the upper end diameter of the prosthesis main body 1 is 13mm-16mm, and the lower end diameter of the prosthesis main body 1 is 6mm-8mm, so that the prosthesis main body 1 as a whole is larger at the top and smaller at the bottom, so that the prosthesis main body 1 matches the lower vertebra of the human body, and the overall size can be modified according to the actual situation of the patient.

[0019] Reference Figure 3 , Figure 6 As shown, specifically, the knob hole 11 includes a tapered portion 111 and a threaded portion 112. The tapered portion 111 is arranged at the front end of the prosthesis body 1 and is connected to the guide hole 12. The threaded portion 112 is arranged at the rear end of the tapered portion 111. In this embodiment, the threaded portion 112 does not penetrate the rear end of the prosthesis body 1, and the tapered knob 2 includes an integrally formed tapered head 21 and a screw rod 22. The screw rod 22 is threadably connected to the threaded portion 112. The tapered head 21 is screwed into the tapered portion 111. Therefore, when the screw rod 22 of the tapered knob 2 is screwed into the threaded portion 112, the tapered head 21 is pushed along the tapered portion 111.

[0020] Reference Figure 2 , Figure 4 , Figure 5As shown, further, the end of the spreader rod 3 has a recess 31 that matches the conical head 21, so that after the conical knob 2 is screwed into the knob hole 11, the spreader rod 3 is pushed to the left and right sides by the rotational force of the conical portion 111 of the conical knob 2, until the other end of the spreader rod 3 is against the lower vertebra of the human body and is locked with the conical knob 2 to form a fixation, thereby fixing the prosthesis body 1 to the upper vertebra of the human body by means of horizontal spreading. This fixing method is simpler than traditional screw fixation and can be fixed without making a hole in the lower vertebra of the human body.

[0021] Reference Figure 1 , Figure 4 As shown, more preferably, in order to prevent the prosthesis body 1 from being displaced after being expanded and fixed on the lower vertebra C1 of the human body, a first plane 13 is provided on both sides of the upper part of the prosthesis body 1 in this embodiment, and a second plane 14 is provided on the rear side of the prosthesis body 1, so that the first plane 13 and the second plane 14 can better fit with the surface of the lower vertebra C1 of the human body, and the mutual constraint between the surfaces is utilized to limit the displacement of the prosthesis body 1 after implantation, thereby greatly improving the stability of the prosthesis body 1 after implantation.

[0022] Reference Figure 2 , Figure 4 As shown, further, a guide groove 121 is provided on the inner wall of the guide hole 12, and a guide block slidably matched with the guide groove 121 is provided on the peripheral wall of the expansion rod 3 to prevent the expansion rod 3 from rotating in the guide groove 121 during horizontal movement, thereby ensuring the stability of the expansion rod 3.

[0023] Specifically, in this embodiment, the conical knob 2 and the spreader rod 3 are manufactured by 3D printing technology according to the size and shape of the knob hole 11 and the guide hole 12 of the prosthesis body 1, and the material of the conical knob 2 and the spreader rod 3 is preferably Ti6Al4V-ELI, thereby ensuring the strength of the conical knob 2 and the spreader rod 3, making the connection between the prosthesis body 1 and the lower vertebra of the human body more secure.

[0024] Reference Figure 1 , Figure 5 As shown, in this embodiment, after the prosthesis main body 1 is formed by 3D printing, the surface of the prosthesis main body 1 is then 3D printed with a porous structure 5 by SLM technology, so that the prosthesis main body 1 can better match and fuse with the lower vertebrae of the human body, and the prosthesis main body 1 is a solid structure as a whole, which is beneficial to bone fusion and ensures the strength of the bionic cervical intervertebral prosthesis.

[0025] The present embodiment is not limited to printing the porous structure on the surface of the prosthesis body 1 after printing it. The prosthesis body 1 and the porous structure 5 may also be integrally formed. This embodiment will not be repeated here.

[0026] The thickness of the porous structure 5 is 0.3mm-1mm. The thickness of the porous structure can be customized according to the actual situation of the patient. In this embodiment, the thickness is preferably 0.5mm. The material of the porous structure 5 is preferably titanium alloy. The porosity and pore size are designed based on the best bone fusion ability, so that it can have good bone cell dependence and biological activity, and promote bone fusion ability.

[0027] Preferably, in this embodiment, a coating may be coated on the surface of the porous structure 5 to improve the wear resistance of the porous structure.

[0028] Of course, the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any modifications made according to the spirit of the main technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A 3D printed bionic hemivertebra, characterized in that: The invention comprises a prosthesis body (1), a conical knob (2), and a spreader rod (3). The top surface of the prosthesis body (1) is provided with an integrally formed upper convex surface (4). The prosthesis body (1) is used to be implanted in the amputated part of the lower vertebra of the human body, and the upper convex surface (4) is tightly fitted with the upper vertebra of the human body. The prosthesis body (1) is provided with a knob hole (11), and the conical knob (2) is screwed into the knob hole (11). The side wall of the prosthesis body (1) is provided with a guide hole (12) connected to the knob hole (11). The spreader rod (3) is slidably inserted into the guide hole (12), and the end of the spreader rod (3) is in contact with the peripheral wall of the conical knob (2). The conical knob (2) is rotated to push the spreader rod (3) to slide along the guide hole (12), so that the other end of the spreader rod (3) is against the lower vertebra of the human body.

2. A 3D printed bionic hemivertebra according to claim 1, characterized in that: The knob hole (11) comprises a tapered portion (111) and a threaded portion (112); the tapered portion (111) is arranged at the front end of the prosthesis body (1) and is connected to the guide hole (12); the threaded portion (112) is arranged at the rear end of the tapered portion (111).

3. A 3D printed bionic hemivertebra according to claim 2, characterized in that: The conical knob (2) comprises a conical head (21) and a screw rod (22), wherein the screw rod (22) is threadedly connected to the threaded portion (112), the conical head (21) is screwed into the conical portion (111), and the end of the expansion rod (3) has a recess (31) matching the conical head (21).

4. The 3D printed bionic hemivertebra according to claim 1, characterized in that: A guide groove (121) is provided on the inner wall of the guide hole (12), and a guide block slidably matched with the guide groove (121) is provided on the peripheral wall of the expansion rod (3).

5. The 3D printed bionic hemivertebra according to claim 1, characterized in that: The surface of the prosthesis body (1) is provided with a porous structure (5) by 3D printing, and the thickness of the porous structure (5) is 0.3 mm-1 mm.

6. The 3D printed bionic hemivertebra according to claim 1, characterized in that: The diameter of the upper end of the prosthesis main body (1) is 13 mm to 16 mm, and the diameter of the lower end of the prosthesis main body (1) is 6 mm to 8 mm.

7. The 3D printed bionic hemivertebra according to claim 1, characterized in that: First planes are arranged on both sides of the upper part of the prosthesis main body (1), and a second plane is arranged on the rear side of the prosthesis main body (1).

8. The 3D printed bionic hemivertebra according to claim 1, characterized in that: The diameter of the upper convex surface (4) is greater than the diameter of the prosthesis body (1).

9. The 3D printed bionic hemivertebra according to claim 5, characterized in that: The surface of the porous structure (5) is coated with a plating layer.

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