CN204971711U - High strength aperture footpath metal bone trabecula - Google Patents
High strength aperture footpath metal bone trabecula Download PDFInfo
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- CN204971711U CN204971711U CN201520367167.1U CN201520367167U CN204971711U CN 204971711 U CN204971711 U CN 204971711U CN 201520367167 U CN201520367167 U CN 201520367167U CN 204971711 U CN204971711 U CN 204971711U
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Abstract
The utility model provides a high strength aperture footpath metal bone trabecula, the three -dimensional spatial structure of this metal bone trabecula for being formed by stacking a plurality of elementary cells, the elementary cell is the polyhedral structure that the edge is entity, all the other part fretworks, all has a face coincidence between two adjacent elementary cells, the inside strengthening rib that is provided with of base plate unit. The utility model discloses the compression strength of the metal bone trabecula of making is 60MPa-90MPa, and equivalent aperture is 100 mu m-150 mu m, and the aperture of printing porous material than conventional 3D has reduced more than 50%, and compression strength has improved more than 20%, does benefit to more that the bone is grown into and cell growth.
Description
Technical field
This utility model belongs to biology medical material technical field, is specifically related to a kind of high strength small-bore metal bone trabecula.
Background technology
In fracture or the treatment of the bone diseases such as osteonecrosis and the field of reparation, especially in the treatment of load bone and reparation, it is that common prevention of osteoporosis disease worsens further, avoids the later stage to fracture the effective ways of even disabling that implant replaces osseous surgery of dying of illness.At present, common implant mainly comprises autologous bone, allograph bone, bioceramic, organic high molecular polymer, degradation material and metal material etc.Metal material, as rustless steel, Co-Cr base alloy, titanium-base alloy etc., owing to can provide good mechanical property, and has corrosion resistance and biocompatibility etc. concurrently, is therefore widely used clinical always.
But because the modulus of the metal materials such as rustless steel, Co-Cr base alloy, titanium-base alloy is obviously higher than osseous tissue modulus, this will cause what is called " stress-shielding effect ".For " stress shielding " problem occurred in treatment bone diseases process, prior art metal material is prepared into cellular to reduce the apparent modulus of material monolithic.But the influence factor of traditional porous metal material preparation technology is too much, flow process is complicated, cannot one-shot forming, and ubiquity pore structure can not accurately control, internal void is communicated with the problems such as rate variance.
3D prints the process by scan-datas such as CT, built by Computer Design, complicated metal structure can be communicated with by being printed as the personalized porous meeting demand, not only provide space to Bone Ingrowth, also because loose structure reduces the elastic modelling quantity of part, achieve and the mating of normal bone tissues elastic modelling quantity, and not mating of degradation time and body demand need not be worried, become the important directions that 3D is printed on orthopaedics development.
Various 3D prints porous titanium alloy material on the market at present, its loose structure is all formed by stacking for base unit simpler array with hexahedron, cylinder, cone, differ larger with the people's bone loose structure in real bionical meaning, and on porous material curved surface, there is loose structure phenomenon pockety, affect the concordance of Bone Ingrowth.Meanwhile, along with the lifting of porosity of porous material, the refinement of hole muscle, mechanical property also decreases, and is difficult to meet the requirement (>50MPa) of bone trabecula to mechanical property; Be limited to the precision of 3D printing device itself and clear powder requirement, it is usually larger that current 3D prints aperture of porous material, diameter about 300 ~ 1500 μm, for the average diameter of 20 ~ 30 μm, cell, obviously too spacious, cell can only seek connections with growth on its hole wall two-dimensional space, can not realize the growth of three-dimensional level in whole hole, and then also cannot realize sufficient bone amount of growing in support.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned the deficiencies in the prior art, provides a kind of high strength small-bore metal bone trabecula.The bone trabecular compressive strength of this metal is 60MPa ~ 90MPa, and effective aperture is 100 μm ~ 150 μm, and the aperture printing porous material than conventional 3D reduces more than 50%, and compressive strength improves more than 20%, is more conducive to Bone Ingrowth and Growth of Cells.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of high strength small-bore metal bone trabecula, it is characterized in that, this metal bone trabecula is the 3-D solid structure be formed by stacking by multiple elementary cell, described elementary cell is seamed edge is entity, the polyhedral structure of remainder hollow out, a face is all had to overlap between adjacent two elementary cells, described elementary cell inside is provided with reinforcement, the bone trabecular compressive strength of described high strength small-bore metal is 60MPa ~ 90MPa, effective aperture is 100 μm ~ 150 μm, described effective aperture refers to the inscribed circle diameter of metal bone trabecula mesopore, high strength small-bore.
Above-mentioned a kind of high strength small-bore metal bone trabecula, it is characterized in that, described reinforcement is made up of the many bodies of rod of the geometric center to summit that connect elementary cell, and the shape of cross section of every root body of rod is square, and the cross section length of side of every root body of rod is 0.1mm ~ 0.3mm.
Above-mentioned a kind of high strength small-bore metal bone trabecula, it is characterized in that, described polyhedron is triagonal bipyrimidal or granatohedron, the length of side of described triagonal bipyrimidal and granatohedron is 0.5mm ~ 2mm, the shape of cross section of described seamed edge is equilateral triangle or square, and the cross section length of side of described seamed edge is 0.1mm ~ 0.3mm.
Above-mentioned a kind of high strength small-bore metal bone trabecula, is characterized in that, the bone trabecular material of described high strength small-bore metal is TC4 titanium alloy.
Above-mentioned a kind of high strength small-bore metal bone trabecula, it is characterized in that, described 3-D solid structure is hexahedron.
Above-mentioned a kind of high strength small-bore metal bone trabecula, it is characterized in that, described 3-D solid structure is hollow hemispheric, described 3-D solid structure offers three through holes.
Above-mentioned a kind of high strength small-bore metal bone trabecula, it is characterized in that, described 3-D solid structure is elliptical cylinder-shape, and on described 3-D solid structure, symmetry offers two D connected in stars.
This utility model compared with prior art has the following advantages:
1, this utility model provides a kind of high strength, small-bore, high bionical metal bone trabecula, this metal bone trabecular hole density has good uniformity, under identical porosity and hole rib part, the bone trabecular compressive strength of this utility model metal can print porous material than conventional 3D and promote more than 20%.
2, this utility model can select different elementary cells according to the actual requirements, thus obtain the metal bone trabecula of different profile and size, different porosities, different pore size, bone trabecular mechanical property can be regulated and controled by the arrangement mode of regulation and control elementary cell internal stiffeners structure and elementary cell.
3, the minimum-value aperture of the bone trabecular loose structure of this utility model metal can reach about 100 μm, the aperture (aperture that conventional 3D prints porous material is all greater than 300 μm) printing porous material than conventional 3D reduces more than 50%, is more conducive to Bone Ingrowth and Growth of Cells.
Below in conjunction with drawings and Examples, this utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the bone trabecular structural representation of this utility model embodiment 1 high strength small-bore metal.
Fig. 2 is the bone trabecular SEM photo of this utility model embodiment 1 high strength small-bore metal.
Fig. 3 is the bone trabecular structural representation of this utility model embodiment 2 high strength small-bore metal.
Fig. 4 is the structural representation of this utility model embodiment 1 and embodiment 2 elementary cell.
Fig. 5 is the bone trabecular structural representation of this utility model embodiment 3 high strength small-bore metal.
Fig. 6 is the bone trabecular structural representation of this utility model embodiment 4 high strength small-bore metal.
Fig. 7 is the structural representation of this utility model embodiment 3 and embodiment 4 ultimate unit.
Description of reference numerals:
1-seamed edge; 2-reinforcement.
Detailed description of the invention
Embodiment 1
As shown in Figure 1 and Figure 4, the present embodiment high strength small-bore metal bone trabecula is the 3-D solid structure be formed by stacking by multiple elementary cell, described elementary cell is seamed edge 1 is entity, the polyhedral structure of remainder hollow out, the present embodiment is preferably the granatohedron of length of side 2mm, the shape of cross section of seamed edge 1 is preferably the square of length of side 0.3mm, a face is all had to overlap between adjacent two elementary cells, described base board unit inside is also provided with reinforcement 2, reinforcement 2 in the present embodiment is preferably made up of 6 bodies of rod of the geometric center to summit that connect elementary cell, the shape of cross section of every root body of rod is the square of length of side 0.3mm.Metal bone trabecular material in the present embodiment high strength small-bore is preferably TC4 titanium alloy, and metal bone trabecular shape in the present embodiment high strength small-bore is hexahedron.
Metal bone trabecular compressive strength in the present embodiment high strength small-bore is 66MPa, and effective aperture (effective aperture refers to the inscribed circle diameter of metal bone trabecula mesopore) is 100 μm ~ 150 μm (as shown in Figure 2).
Embodiment 2
As shown in Figure 3 and Figure 4, the present embodiment high strength small-bore metal bone trabecula is the 3-D solid structure be formed by stacking by multiple elementary cell, described elementary cell is seamed edge 1 is entity, the polyhedral structure of remainder hollow out, the present embodiment is preferably the granatohedron of length of side 0.5mm, the shape of cross section of seamed edge 1 is preferably the equilateral triangle of length of side 0.15mm, a face is all had to overlap between adjacent two elementary cells, described base board unit inside is also provided with reinforcement 2, reinforcement 2 in the present embodiment is preferably made up of 6 bodies of rod of the geometric center to summit that connect elementary cell, the shape of cross section of every root body of rod is the square of length of side 0.15mm.Metal bone trabecular material in the present embodiment high strength small-bore is preferably TC4 titanium alloy, it is hollow hemispheric (internal diameter 22mm that the present embodiment high strength small-bore metal bone trabecula is preferably shape, external diameter 24mm) bone trabecula acetabular cup, it has three through holes.
Metal bone trabecular compressive strength in the present embodiment high strength small-bore is 70MPa, and effective aperture (effective aperture refers to the inscribed circle diameter of metal bone trabecula mesopore) is 100 μm ~ 150 μm.
Embodiment 3
As shown in figure 5 and figure 7, the present embodiment high strength small-bore metal bone trabecula is the 3-D solid structure be formed by stacking by multiple elementary cell, described elementary cell is seamed edge 1 is entity, the polyhedral structure of remainder hollow out, the present embodiment is preferably the triagonal bipyrimidal of length of side 0.5mm, the shape of cross section of seamed edge 1 is preferably the square of length of side 0.1mm, a face is all had to overlap between adjacent two elementary cells, described base board unit inside is also provided with reinforcement 2, reinforcement 2 in the present embodiment is preferably made up of 5 bodies of rod of the geometric center to summit that connect elementary cell, the shape of cross section of every root body of rod is the square of length of side 0.1mm.Metal bone trabecular material in the present embodiment high strength small-bore is preferably TC4 titanium alloy, and metal bone trabecular shape in the present embodiment high strength small-bore is hexahedron.
Metal bone trabecular compressive strength in the present embodiment high strength small-bore is 75MPa, and effective aperture (effective aperture refers to the inscribed circle diameter of metal bone trabecula mesopore) is 100 μm ~ 150 μm.
Embodiment 4
As shown in Figure 6 and Figure 7, the present embodiment high strength small-bore metal bone trabecula is the 3-D solid structure be formed by stacking by multiple elementary cell, described elementary cell is seamed edge 1 is entity, the polyhedral structure of remainder hollow out, the present embodiment is preferably the triagonal bipyrimidal of length of side 0.7mm, the shape of cross section of seamed edge 1 is preferably the equilateral triangle of length of side 0.2mm, a face is all had to overlap between adjacent two elementary cells, described base board unit inside is also provided with reinforcement 2, reinforcement 2 in the present embodiment is preferably made up of 5 bodies of rod of the geometric center to summit that connect elementary cell, the shape of cross section of every root body of rod is the square of length of side 0.2mm.Metal bone trabecular material in the present embodiment high strength small-bore is preferably TC4 titanium alloy, and the present embodiment high strength small-bore metal bone trabecula is preferably the bone trabecula vertebrae mixer that shape is elliptical cylinder-shape, and upper symmetry offers two D connected in stars.
Metal bone trabecular compressive strength in the present embodiment high strength small-bore is 90MPa, and effective aperture (effective aperture refers to the inscribed circle diameter of metal bone trabecula mesopore) is 100 μm ~ 150 μm.
This utility model high strength small-bore metal bone trabecula prepares by following steps:
Step one, 3 d modeling software is utilized to set up the bone trabecular three-dimensional entity model of high strength small-bore metal; Described 3 d modeling software is Pro/Engineer software, Solidworks software or Unigraphic software;
Step 2, utilization is cut layer software and is carried out section sliding-model control to the high strength small-bore bone trabecular three-dimensional entity model of metal set up in step one, obtain the cross-section data of each layer section, the cross-section data of then being cut into slices by each layer imports in electron beam rapidform machine as electron beam scanning path, machined parameters is set afterwards on electron beam rapidform machine, described machined parameters comprises metal dust thickness, fusion current and beam scan velocity, be preferably: metal dust thickness 50 μm ~ 80 μm, fusion current 10mA ~ 30mA, electron beam scanning speed 1.3 × 10
4mm/s ~ 1.55 × 10
5mm/s, described layer software of cutting is AutoFab software, NetFabb software or Magcs software,
Step 3, metal dust joined in step 2 set in the electron beam rapidform machine after machined parameters, be evacuated to vacuum and be not more than 3 × 10
-1be filled with noble gas after Pa, then adopt electron beam to carry out preheating to the base plate in electron beam rapidform machine until the temperature of base plate is 650 DEG C ~ 800 DEG C;
Step 4, be laid in metal dust in step 3 after preheating base plate on, then adopt electron beam to carry out preheating to the metal dust be laid on base plate;
Step 5, employing electron beam carry out selective melting scanning according to the path of electron beam scanning described in step 2 to the metal dust after preheating in step 4, form monolayer entity lamella;
Step 6, repeat the tiling metal dust described in step 4 and carry out choosing to the metal dust after preheating the processing technique that fusing scanning forms monolayer entity lamella described in the processing technique of preheating and step 5, until each layer entity lamella has all been prepared, obtain metal bone trabecula 3D printout;
Powder in metal bone trabecula 3D printout described in the compressed air removing step six that step 7, employing pressure are 0.8MPa ~ 0.9MPa, cleans up post-drying;
Step 8, by step 7 dry after metal bone trabecula 3D printout be placed in electrolyte, with metal bone trabecula 3D printout for anode, take platinized platinum as negative electrode, be 20V ~ 80V at voltage, temperature is electrochemical corrosion 0.5h ~ 8h under the condition of 10 DEG C ~ 30 DEG C, obtains high strength small-bore metal bone trabecula; Described electrolyte is preferably formed by Disodium oxalate., ammonium fluoride, sodium silicate, calcium hydroxide and deionized water mix homogeneously, wherein the concentration of Disodium oxalate. is 5g/L ~ 20g/L, the concentration of ammonium fluoride is 0.5g/L ~ 2g/L, the concentration of sodium silicate is 1g/L ~ 3g/L, and the concentration of calcium hydroxide is 0.13g/L ~ 0.18g/L.
This utility model high strength small-bore metal bone trabecula is mainly used in bone and substitutes reparation.During use, the more conventional 3D in the bone trabecular aperture of this utility model metal prints porous material (its compressive strength < 50MPa, aperture > 300 μm) aperture reduce more than 50%, be conducive to better fusion, and porosity still can reach more than 70% and increase mechanical strength, thus effectively can avoid stress shielding, be more conducive to Bone Ingrowth and Growth of Cells.
The above is only preferred embodiment of the present utility model, not imposes any restrictions this utility model.Every above embodiment is done according to utility model technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solutions of the utility model.
Claims (7)
1. a high strength small-bore metal bone trabecula, it is characterized in that, this metal bone trabecula is the 3-D solid structure be formed by stacking by multiple elementary cell, described elementary cell is seamed edge (1) is entity, the polyhedral structure of remainder hollow out, a face is all had to overlap between adjacent two elementary cells, described elementary cell inside is provided with reinforcement (2), the bone trabecular compressive strength of described high strength small-bore metal is 60MPa ~ 90MPa, effective aperture is 100 μm ~ 150 μm, described effective aperture refers to the inscribed circle diameter of metal bone trabecula mesopore, high strength small-bore.
2. a kind of high strength small-bore according to claim 1 metal bone trabecula, it is characterized in that, described reinforcement (2) is made up of the many bodies of rod of the geometric center to summit that connect elementary cell, the shape of cross section of every root body of rod is square, and the cross section length of side of every root body of rod is 0.1mm ~ 0.3mm.
3. a kind of high strength small-bore according to claim 1 metal bone trabecula, it is characterized in that, described polyhedron is triagonal bipyrimidal or granatohedron, the length of side of described triagonal bipyrimidal and granatohedron is 0.5mm ~ 2mm, the shape of cross section of described seamed edge (1) is equilateral triangle or square, and the cross section length of side of described seamed edge (1) is 0.1mm ~ 0.3mm.
4. a kind of high strength small-bore according to claim 1 metal bone trabecula, is characterized in that, the bone trabecular material of described high strength small-bore metal is TC4 titanium alloy.
5. a kind of high strength small-bore metal bone trabecula according to claim arbitrary in Claims 1-4, it is characterized in that, described 3-D solid structure is hexahedron.
6. a kind of high strength small-bore metal bone trabecula according to claim arbitrary in Claims 1-4, it is characterized in that, described 3-D solid structure is hollow hemispheric, described 3-D solid structure offers three through holes.
7. a kind of high strength small-bore metal bone trabecula according to claim arbitrary in Claims 1-4, it is characterized in that, described 3-D solid structure is elliptical cylinder-shape, and on described 3-D solid structure, symmetry offers two D connected in stars.
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