212 results about "Porous tantalum" patented technology

The invention discloses a method for preparing a medical porous tantalum material. The method comprises the following steps of: mixing a poly ethanol aqueous solution and tantalum powder to obtain slurry, wherein the mass concentration of the poly ethanol aqueous solution is 2 to 8 percent; injecting the slurry into an organic foam by vibrating and pressurizing, wherein the vibrating frequency is 20 to 80 times/min; drying; degreasing; sintering, namely raising temperature to 1,500 to 1,800 DEG C at the speed of 10 to 20 DEG C/min under the vacuum degree of 10<-4> to 10<-3>Pa, preserving heat for 120 to 240 minutes, cooling to 200 to 300 DEG C along with a furnace, raising temperature to 1,500 to 1,800 DEG C at the speed of 10 to 20 DEG C/min again, preserving heat for 180 to 240 minutes, raising temperature to 2,000 to 2,200 DEG C at the speed of 5 to 10 DEG C/min, and preserving heat for 120 to 360 minutes; cooling; and performing thermal treatment, namely raising temperature to 800 to 900 DEG C at the speed of 10 to 20 DEG C/min under the vacuum degree of 10<-4> to 10<-3> Pa, preserving heat for 240 to 480 minutes, cooling to 400 DGE C at the speed of 2 to 5 DGE C/min, preserving heat for 120 to 300 minutes, and cooling to room temperature along with the furnace. The porous tantalum prepared by the method is very suitable to be used for the medical implant material for replacing bearing bone tissues, and biocompatibility and the mechanical property can be guaranteed simultaneously.

Dental implants made at least in part of a porous tantalum material for enhancing the osseointegration of the dental implant into surrounding bone. For example, there is provided a dental implant which includes a porous tantalum portion and an outer portion having a color generally replicating the color of natural teeth. The dental implant further comprises a core portion and the porous tantalum portion at least partially surrounds the core portion. An esthetic portion is disposed at least the outer portion and the porous tantalum portion is disposed for at least partially reinforcing the esthetic portion. After implantation of the implant, bone tissue may osseointegrate into the porous tantalum portion to anchor the implant in position within the surrounding bone. Other embodiments of implants are provided, each implant including at least a portion thereof formed of porous tantalum for improved osseointegration.

An interbody fusion device in one embodiment includes a tapered body defining a hollow interior or chamber for receiving bone graft or bone substitute material. The body defines exterior threads which are interrupted over portions of the outer surface of the device. The fusion device includes truncated side walls so that on end view the body takes on a cylindrical form. In another embodiment, the tapered body is solid and formed of a porous biocompatible material having sufficient structural integrity to maintain the intradiscal space and normal curvature. The material is preferably a porous tantalum composite having fully interconnected pores to facilitate complete bone tissue ingrowth into the implant. In further embodiments, the fusion devices are provided with osteogenic material to facilitate bone ingrowth. A cap is also provided to block the opening of hollow fusion devices. The cap includes an occlusion body and an elongated anchor. In some embodiments the anchor includes a lip which is engageable to openings in the body wall. Tools are also provided for manipulating caps for interbody fusion devices. In one embodiment the tool includes a pair of prongs each having facing engagement surfaces for engaging the fusion device, and a shaft slidably disposed between the prongs. The shaft has a first end defining a cap-engaging tip for engaging a tool hole in the cap. In one embodiment the cap engaging tip defines threads. In another embodiment the prongs include a pair of releasing members on each of the facing engagement surfaces. The releasing members have a height and a width for being insertable into apertures in a body wall in the fusion device to disengage the elongate anchors from the apertures.

The invention relates to a medical implant part for femoral head joint surface depression or I-stage or II-stage femoral head necrosis, namely a porous tantalum rod. One end of the implant part is provided with a connection fastening structure connected with a bone tissue, and a through hole is formed in the center of the tantalum rod; the porous tantalum rod is made of a porous tantalum material with a foam structure of pore three-dimensional communicated distribution, and is sintered by adopting a foam impregnation method; and tantalum powder particles have a sinter neck structure on a foam frame formed by accumulating the sintered pure tantalum powder. The through hole in the porous tantalum rod facilitates accurate positioning in an operation; and a related object can be picked out and injected conveniently through the through hole, so that the effect of constant pressure reduction can be achieved.

The invention discloses a method for preparing a porous tantalum medical implant material. The method comprises the following steps of: feeding mixed tantalum power formed by mixing pure tantalum powder and a forming agent into a printing platform of a three-dimensional printer, and rolling and paving; spraying an adhesion agent by a printing head of the three-dimensional printer to adhere the mixed tantalum powder so as to form a two-dimensional plane; descending a working table 80 to 100 mu m, and processing the next layer; accumulating and forming layer by layer; removing the tantalum powder particles which are not adhered to obtain an initially formed sample; and performing aftertreatment such as degreasing, vacuum sintering, cooling and the like to obtain the porous tantalum medical implant material, wherein the volume ratio of the pure tantalum powder to the forming agent is (60-80):(20-40), and the adhesion agent is 1 mass percent alpha-cyanoacrylate adhesive. The pores of the porous tantalum medical implant material prepared by the method are completely communicated in a three-dimensional mode; the porous tantalum medical implant material prepared by the method is high in biocompatibility; and meanwhile, the mechanical property of the porous tantalum medical implant material prepared by the method is consistent with that of loading bone tissues of a human body.

A dental implant has a body and a plurality of distinct roots that extend outwardly from the main portion that generally define a coronal-apical axis. A porous tantalum metal portion is disposed at the body for engaging bone and the plurality of distinct roots are configured to resist a torsional force that is applied to the dental implant and around the coronal-apical axis.

A method for bonding a porous tantalum structure to a substrate is provided. The method comprises providing a substrate comprising cobalt or a cobalt-chromium alloy; an interlayer consisting essentially of at least one of hafnium, manganese, niobium, palladium, zirconium, titanium, or alloys or combinations thereof; and a porous tantalum structure. Heat and pressure are applied to the substrate, the interlayer, and the porous tantalum structure to achieve solid-state diffusion between the substrate and the interlayer and between the interlayer and the porous tantalum structure.

The invention discloses a preparation method of porous tantalum. The preparation method comprises the following steps of: a), laying a layer of tantalum powder on a substrate; b), melting the tantalum powder in the step a) through a laser cladding method according to a preset scanning track; and c), laying a layer of powder again, repeating the laser cladding process in the step b), wherein the step c) is performed at least once, so as to prepare multiple layers of porous tantalum. The invention also discloses a device applied to the preparation method of porous tantalum. According to the invention, the laser cladding method is applied to the preparation of porous tantalum; and porous tantalum prepared by the preparation method and the device can be directly formed in no need of subsequent processing, and at the same time, any toxic substances are not introduced in the preparation process, and any substances can not be remained.

Disclosed is medical tantalum powder. The oxygen content of the tantalum powder is smaller than or equal to 1000ppm, the granularity of 95% of the tantalum powder is 1.0-50.0 micrometers, and the particle shape of the tantalum powder is spherical or sphere-like. The preparation method of the medical tantalum powder includes that hydrogenation, breaking, classification and impurity removal, wherein breaking includes that coarse breaking is performed, the particle size of tantalum powder subjected to coarse breaking is controlled below 3mm, then the tantalum powder is delivered into a cyclonic breaking classifier to be broken and classified, the power of a classifying wheel is controlled below 50KW/hour, and the impact gas flow is 0.3-0.8 MPa. The medical tantalum powder is applied to preparation of medical porous tantalum implant materials and has high sintering strength, and prepared porous tantalum is even in pore size, stable in mechanical property, high in purity and good in biocompatibility, accordingly is an ideal material for human skeleton production. The preparation method of the medical tantalum powder is simple, the product percent of pass is high, the rate of finished products can reach 99.0%-99.5%, and the production cost is low. Besides, compared with cost of the current tantalum powder technique, the cost of the medical tantalum powder is reduced by 40-50%.

The invention relates to a medical permanent implantation object, in particular to a medical implantation porous tantalum rod used for treating early-mid femoral head necrosis. The porous tantalum rod comprises a body, wherein one end of the body is provided with a groove, the other end of the body is provided with a threaded structure, and a notch is formed in the end surface of the tail end of the threaded structure. One end of the body of the porous tantalum rod is provided with the notch, bone marrow stromal cells or bone marrow stromal cell united biological membrane complexes and the like can be loaded, the generation of a new bone is favorably realized, a better clinical effect is particularly realized in the early femoral head necrosis treatment, and the defects of poor clinical treatment effect and the like of the existing entity type porous tantalum rod are overcome. The porous tantalum rod has the advantages that the preparation method is simple, the cost is low, the implementation and the clinical application are favorably realized, and the porous tantalum rod is suitable for the need of wide patients.

The invention provides a porous tantalum-niobium alloy. The porous tantalum-niobium alloy has a pore structure with interconnected through holes. The porosity of the porous tantalum-niobium alloy is 50%-70%. A preparation method of the porous tantalum-niobium alloy comprises the following steps: uniformly mixing tantalum powder and niobium powder, then adding a dispersing agent solution, uniformly mixing so as to obtain tantalum-niobium mixed powder slurry, and filling the tantalum-niobium mixed powder slurry into a porous template, thus obtaining the porous template containing the tantalum-niobium mixed powder slurry; drying the porous template containing the tantalum-niobium mixed powder slurry in vacuum so as to obtain a biscuit; heating the biscuit to 400 DEG C-600 DEG C in a protective gas atmosphere, and carrying out degreasing treatment, thus obtaining the degreased biscuit; and sintering the degreased biscuit in vacuum so as to obtain the porous tantalum-niobium alloy. The porous tantalum-niobium alloy has a three-dimensional connected structure and appropriate porosity, and the elasticity modulus of the material is reduced while the proper strength and porosity are ensured, so that the elasticity modulus is appropriate to that of human bones. The preparation method of the porous tantalum-niobium alloy is simple in process and equipment and low in cost; the porosity of the porous tantalum-niobium alloy is easy to adjust.

A porous tantalum used for medical implantation is provided, which includes a foam structure with three-dimensional interconnecting pores and produced by: mixing a solution made by organic binder and dispersant and tantalum powder to form tantalum slurry, casting the tantalum slurry into a organic foam body through impregnation until the pores of the organic foam body are filled, drying the impregnated organic foam body with the tantalum slurry to remove the dispersant, degreasing the dried organic foam body to separate the organic binder and the organic foam body from the dried tantalum slurry in a protective environment of inert gas, vacuum sintering the dried tantalum slurry to obtain a porous sintered body, and vacuum annealing then treating the porous sintered body with normal post-treatments to obtain the porous tantalum. Accordingly, the porous tantalum has well-distributed interconnecting pores and sintering neck structures resulting in good mechanical properties, and especially good ductility.

The invention relates to a preparation method of a porous tantalum medical implant material. The preparation method comprises the following steps: by adopting pure tantalum powder with the particle size of not more than 10mu m as a raw material, directly performing selective laser sintering formation to form a human bone metal biomimetic material, wherein the thickness of powder spread in each layer during selective laser sintering is 60-80mu m; further sintering and cooling the formed human bone metal biomimetic material to obtain the porous tantalum medical implant material. The porous tantalum medical implant material with complete three-dimensional communication is obtained by sintering and cooling treatment of a formed blank prepared by selective laser sintering, and has a consistent microstructure with a bone tissue of a human body, so that the porous metal implant material has good biocompatibility and biological safety. The method provided by the invention further has the advantages of simple process equipment, low operation cost, no pollution in the whole preparation process, no side effect on a human body, capacity of ensuring the biological safety of the implant material and high forming speed, and is very conductive to industrial production and application.

Methods for bonding a porous tantalum structure to a substrate are provided. The method includes placing a compressible or porous interlayer between a porous tantalum structure and a cobalt or cobalt-chromium substrate to form an assembly. The interlayer comprising a metal or metal alloy that has solid state solubility with both the substrate and the porous tantalum structure. Heat and pressure are applied to the assembly to achieve solid state diffusion between the substrate and the interlayer and the between the porous tantalum structure and the interlayer.

The invention relates to a 3D-printed porous tantalum metal bone plate. The 3D-printed porous tantalum metal bone plate is characterized in that tantalum metal powder is taken as a base material, andthe bone-imitating trabecular bone plate having bone induction property and produced by 3D printing has an interconnecting-pore structure fit for bone growth. The production method includes: under argon production, using medical grade spherical tantalum powder as a raw material to produce the porous bone plate by 3D printing; removing excess metal powder adhering to the surface of the bone plate through sandblasting; removing residual stress through heat treatment to make the surface of the bone plate smooth. By the arrangement, the porous bone plate with the bone induction property can form excellent bone integration with bone tissue so as to achieve permanent fixation in biology.

The invention discloses a customized porous tantalum implant and a preparation method thereof. The preparation method comprises the following steps: firstly, adopting CT or MRI scanning to obtain a multiplanar reconstruction image of a natural bone, designing the appearance of a customized implant, shelling the customized implant, and designing net racks in a shell; manufacturing prototypes of the thin shell and the net racks by a rapid prototyping machine; uniformly mixing tantalum powder and pellets capable of burning loss to obtain a mixture, adding the mixture in a dispersant to prepare mixed slurry of the powder and the pellets, filling a prototype stent with the mixed slurry, performing vacuum drying to obtain a green body, carrying out low-temperature sintering and skimming in protecting gas at the temperature of 1,000-1,200 DEG C to obtain low-strength porous tantalum body, and performing low-temperature sintering and skimming in the protecting gas at the temperature of 1,800-2,500 DEG C to obtain the final customized porous tantalum implant. The net racks and the pellets can form communicated main pipelines and communicated spherical holes, and the main pipelines can prevent passages from blockage, so that nutriment conveying is facilitated, the spherical holes are beneficial to bone cell adhesion and growth, and the elasticity modulus of the implant is equivalent to that of that of the human bone.

The embodiment of invention relates to a method for preparing a porous tantalum additive. The method for preparing the porous tantalum additive comprises the following steps that a three-dimensional model of a to-be-machined workpiece is constructed; slicing treatment is conducted on the three-dimensional model and sliced layer data are acquired, scanning path planning is conducted on the sliced layer data, and scanning path data are formed; the scanning path data are imported into electron beam selective melting equipment; powder grading is conducted on spherical tantalum powder, and spherical tantalum powder with apparent density greater than 9g/cm<3> is acquired; the oxygen content of the spherical tantalum powder is less than 150 ppm; and spherical tantalum powder with apparent densitygreater than 9g/cm<3> is loaded into the electron beam selective melting equipment, selective melting scanning is conducted on spherical tantalum powder according to the scanning path data, and a target workpiece is acquired. According to the method for preparing the porous tantalum additive disclosed by the embodiment of the invention, on the one hand, working procedures are simple, follow-up treatment is not needed, secondary pollution is avoided, and moreover, biological stability of the porous tantalum additive as a human body implant is high in long-term use; and on the other hand, porous tantalum prepared with the method is low in oxygen content, light in weight and high in compression strength and has outstanding plasticity.

The invention provides a preparation method of porous tantalum applicable to replacing human dentale tissue. The preparation method comprises the following steps of: mixing tantalum powder, pore-forming agent and forming agent to form into mixed powder, pelleting, injecting into a mould to be formed, demoulding, degreasing, sintering and carrying out thermal treatment, wherein the pore-forming agent is one kind or several kinds of sodium bicarbonate, urea, sodium chloride, methylcellulose and ethocel; the forming agent is one kind or several kinds of poval, stearic acid, zinc stearate, paraffins and synthetic rubber; the degreasing process comprises the following steps of: gradually heating up to 400-800 DEG C at the speed of the 0.5-3DEG C/min, forming the protective atmosphere by charging argon, and keeping the temperature for 60-240min; and the sintering step comprises the following steps of: heating up to 1500-1800 DEG C at the speed of 10-20 DEG C/min under the vacuum degree of 10<-4>-10<-3>Pa, keeping the temperature for 120-240min, cooling to 200-300DEG C along with a furnace, heating up to 1500-1800 DEG C at the speed of 10-20 DEG C/min, keeping the temperature for 180-240min, heating up to 2000-2200 DEG C at the speed of 5-10 DEG C/min, and keeping the temperature for 120-360min. The prepared porous tantalum is very applicable to the medical implant material capable of replacing the human dentale tissue.

The invention relates to a method for preparing medical porous tantalum with three-dimensional reticular graphite foam or reticular vitreous carbon, which has the advantages of uniform coating, no residual particles, good biocompatibility, and convenience for manufacture in later period. The technical scheme of the method is as follows: the method comprises the following steps of (1) preparing a template and a tantalum source, wherein the template is the three-dimensional reticular graphite foam or the reticular vitreous carbon, and the tantalum source is tantalum pentafluoride, tantalum pentachloride or tantalum ethoxide; and (2) placing the three-dimensional reticular graphite foam or reticular vitreous carbon template in a vapor deposition furnace for reaction by a vapor deposition method, so as to prepare the finish product.