3D printing bone grafting bin-free interbody fusion cage

Abstract

The invention discloses a 3D printing bone grafting bin-free interbody fusion cage which is characterized in that the 3D printing bone grafting bin-free interbody fusion cage comprises a supporting structure and a porous structure, the porous structure and the supporting structure are integrally printed and formed, the porous structure is constructed through connecting rods which are mutually connected in a space, and the porous structure is filled and stacked in the supporting structure; the support structure includes an edge. A through hole is formed in a gap between the connecting rods, and the through hole of the supporting structure is in an irregular shape. The 3D printing bone grafting bin-free porous interbody fusion cage is of a hexahedron structure, and the contour of the side wall of the porous structure achieves circular arc transition through fillets. The problems that a traditional interbody fusion cage is too high in elasticity modulus and has a stress shielding effect can be solved, the elasticity modulus of the 3D printing bone grafting bin-free porous interbody fusion cage is matched with the elasticity modulus of a human body bone of a patient part, bone grafting is not needed, and a good bone ingrowth effect can be achieved.

Description

Technical Field

[0001] This invention belongs to the field of orthopedic implantable medical devices and relates to a 3D-printed interbody fusion device without bone graft chamber. Background Technology

[0002] Currently, the most common interbody fusion cages are machined, which often have a high elastic modulus. When implanted, these cages can cause stress shielding, leading to poor postoperative healing in patients.

[0003] Materials used for 3D-printed interbody fusion devices include polyetheretherketone (PEEK), titanium alloys, tantalum alloys, and magnesium alloys. 3D-printed PEEK interbody fusion devices have a low elastic modulus, but the material also has poor hydrophilicity, resulting in poor bone ingrowth after implantation.

[0004] 3D-printed interbody fusion cages without bone grafts offer the advantages of low elastic modulus and good bone ingrowth. Conventional 3D-printed interbody fusion cages without bone grafts typically include a bone graft chamber, which can be filled with autologous bone, allogeneic bone, etc., to induce new bone ingrowth and ultimately achieve fusion between vertebral bodies.

[0005] Traditional interbody fusion devices still struggle to prevent subsidence and poor fusion, leading to unsatisfactory surgical outcomes. Therefore, there is an urgent need for a fusion device with excellent bone ingrowth, enabling good bone fusion without bone grafting. Summary of the Invention

[0006] In view of this, the present invention provides a 3D-printed porous interbody fusion device without bone graft chamber, which can match the elastic modulus of human bone at the patient site, so that good bone ingrowth effect can be achieved without bone graft or with a small amount of bone graft.

[0007] The technical solution adopted by the present invention to solve its technical problem is: to provide a 3D bone graft-free porous interbody fusion device, including: a support structure and a porous structure, wherein the porous structure and the support structure are integrally printed, the porous structure is constructed by connecting rods that are interconnected in space, the porous structure is filled and stacked inside the support structure, and the support structure includes an edge.

[0008] Preferably, the gaps between the connecting rods form through holes, and the through holes in the support structure are irregular in shape.

[0009] Preferably, the 3D-printed porous interbody fusion device without bone grafts has a hexahedral structure, and the sidewall contour of the porous structure is rounded to achieve an arc transition.

[0010] Preferably, the porous structure includes a trabecular structure or a Thiessen polygonal structure. Preferably, the porosity of the porous structure is 5%–95%, the rod diameter is 100 μm–400 μm, and the pore size is 50 μm–400 μm.

[0011] Preferably, the materials used to manufacture the 3D-printed porous interbody fusion device without bone grafts include: titanium alloy, tantalum alloy, and cobalt-chromium-molybdenum alloy.

[0012] Preferably, the instrument groove is disposed on the side of the porous structure, and the instrument groove includes stepped type, threaded hole type, and hybrid type.

[0013] According to the technical solution of the present invention, the above invention has the following advantages or beneficial effects:

[0014] The 3D-printed interbody fusion cage without a bone graft compartment features a structural design that reduces the loss of autologous and allogeneic bone materials, minimizing patient trauma and financial burden. Its porous structure promotes cell adhesion and bone ingrowth. Furthermore, it addresses the issue of excessively high elastic modulus and stress shielding in traditional interbody fusion cages by adjusting the porous structure parameters to match the elastic modulus of human bone.

[0015] The further effects of the aforementioned non-conventional alternative methods will be explained below in conjunction with specific implementation methods. Attached Figure Description

[0016] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein:

[0017] Figure 1 This is a schematic diagram of the 3D-printed interbody fusion device without bone graft in Embodiment 1 of the present invention;

[0018] Figure 2 This is a side view of the 3D-printed interbody fusion device without bone graft in Embodiment 1 of the present invention;

[0019] Figure 3 This is a side view of the 3D-printed interbody fusion device without bone graft in Embodiment 2 of the present invention;

[0020] Figure 4 This is a schematic diagram of the 3D-printed interbody fusion device without bone graft in Embodiment 2 of the present invention;

[0021] Figure 5 This is a frontal schematic diagram of the 3D-printed interbody fusion device without bone graft compartment in Embodiment 2 of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] Reference numerals: 1-Support structure; 2-Porous structure; 3-Instrument slot; 4-Connecting rod; 5-Through hole; 6-Side support; 7-Edge support; 8-End face support. Detailed Implementation

[0024] To better illustrate the present invention and facilitate understanding of its technical solutions, the present invention will be further described in detail below. However, the following embodiments are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0025] For simplicity, certain technical features known to those skilled in the art are omitted in the following description.

[0026] According to one embodiment 1 of this application, as Figure 1-5 As shown, a 3D-printed interbody fusion device without bone grafts includes: a support structure 1 and a porous structure 2. The porous structure 2 is integrally printed with the support structure 1. The porous structure 2 is constructed by connecting rods 4 that are interconnected in space. The porous structure 2 fills and stacks inside the support structure 1. The support structure 1 includes side supports 6, edge supports 7, and end supports 8.

[0027] The side support 6 provides vertical support for the 3D-printed bone graft-free interbody fusion device. The edge support 7 and end face support 8 not only provide support but also prevent the interbody fusion device from dislodging.

[0028] The gaps between the connecting rods 4 form through holes 5, and the through holes 5 of the support structure 1 are irregularly shaped. The connecting rods 4 can be straight or curved. The diameters of different cross-sections of the connecting rods 4 can be the same or different.

[0029] According to claim 2, the 3D-printed interbody fusion device without bone graft is characterized in that it has a hexahedral structure, and the contours of the porous structure's two side walls are rounded to achieve an arc transition. The rounded corner design facilitates deep insertion into the intervertebral space during implantation and also avoids stress concentration.

[0030] According to claim 3, a 3D-printed interbody fusion device without bone graft is characterized in that the porous structure 2 includes a trabecular bone structure and a Thiessen polygonal structure.

[0031] According to claim 4, a 3D-printed interbody fusion device without bone grafts is characterized in that the porosity of the porous structure 2 is 5% to 95%, the diameter of the rod in the porous structure 2 is 100 μm to 400 μm, and the pore diameter of the porous structure 2 is 50 μm to 400 μm. The porous structure 2 includes a trabecular bone structure and a Thiessen polygonal structure.

[0032] According to claim 5, the 3D-printed interbody fusion device without bone graft is characterized in that the materials used to manufacture the 3D-printed interbody fusion device without bone graft include: titanium alloy, tantalum alloy, and cobalt-chromium-molybdenum alloy. Specifically, the metallic materials include titanium alloy, magnesium alloy, tantalum alloy, and cobalt-chromium-molybdenum alloy, and the polymer materials include PLA, ABS, and PETG.

[0033] According to claim 6, a 3D-printed interbody fusion device without bone graft is characterized in that an instrument slot 3 is disposed on the side of the porous structure, and the instrument slot 3 includes stepped, threaded hole, and hybrid types. The instrument slot 3 is used to hold the interbody fusion device during surgery.

[0034] The 3D-printed bone graft-free interbody fusion device is made using 3D printing technology, eliminating assembly issues and ensuring that there are no unstable joints between different structures.

[0035] Example 2

[0036] like Figure 3-5 As shown, the difference between this embodiment and Embodiment 1 is that the porous structure 2 of the 3D-printed interbody fusion device without bone graft chamber has a sloping side facing the instrument slot 3. Simultaneously, the sloping design better conforms to the upper and lower endplates of the patient's adjacent vertebrae, resulting in a larger contact area between the interbody fusion device and the vertebral endplates, thus avoiding problems such as poor matching and stress concentration.

[0037] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A 3D printed intervertebral cage without bone graft compartment, characterized in that, It includes: a support structure and a porous structure, wherein the porous structure and the support structure are integrally printed and formed, the porous structure is constructed by connecting rods that are interconnected in space, and the porous structure is filled and stacked inside the support structure, and the support structure includes side support, edge support and end support.

2. The 3D printed intervertebral fusion cage without bone grafting according to claim 1, wherein, The gaps between the connecting rods form through holes, and the through holes in the support structure are irregular in shape.

3. The 3D-printed interbody fusion device without bone graft compartment according to claim 2, characterized in that, The 3D-printed bone graft-free interbody fusion device has a hexahedral structure, and the sidewall contour of the porous structure is rounded to achieve an arc transition.

4. The 3D-printed interbody fusion device without bone graft compartment according to claim 3, characterized in that, The porous structure includes trabecular bone structure and Thiessen polygonal structure.

5. A 3D-printed interbody fusion device without bone graft compartment according to claim 4, characterized in that, The porous structure has a porosity of 5% to 95%, a rod diameter of 100 μm to 400 μm, and a pore size of 50 μm to 400 μm.

6. A 3D-printed interbody fusion device without bone graft compartment according to claim 5, characterized in that, The materials used to fabricate the 3D-printed bone graft-free interbody fusion device include: titanium alloy, tantalum alloy, and cobalt-chromium-molybdenum alloy.

7. A 3D-printed interbody fusion device without bone graft compartment according to claim 6, characterized in that, Instrument slots are disposed on the side of the porous structure, and the instrument slots include stepped type, threaded hole type, and hybrid type.

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