64 results about "Cobalt Chromium Alloys" patented technology

A dual mobility femoral head construct has a secure acetabular shell received within an acetabular recess formed in a pelvis. An implantable prosthetic device is implantable after a failure of an originally installed articular head insert of an acetabular cup assembly. A hemispherical liner is formed from a cast cobalt-chromium alloy for thinness and elasticity. At least three spacers are annularly displaced about an outer diameter of the hemispherical liner to define a uniform cement thickness with the secure acetabular shell. Web shaped depressions are formed circumferentially in the outer diameter of the hemispherical liner to receive cement to resist lever out forces and to secure the cement bond with the secure acetabular shell. A replacement articular head insert is then received for dual mobility rotational movement in an inner diameter of the hemispherical liner. A femoral head implant is received for articulating movement in the articular head insert.

The invention discloses an intravascular stent of a composite structure; the intravascular stent comprises a stent main body, wherein the distal end of the stent is restrained as an adducted form by virtue of a tightening wire, and the tightening wire is degradable magnesium alloy or degradable iron alloy; one or more auxiliary wires are woven on the stent main body; when the stent is applied to blood vessel of brain, the auxiliary wire is pure platinum or alloy thereof, pure gold or alloy thereof, pure tungsten or alloy thereof, or pure tantalum or alloy thereof; and when the stent is applied to peripheral blood vessel, the auxiliary wire is cobalt-chromium alloy or stainless steel or tungsten or tantalum. The stent, when serving as a thrombus removal system for treating cerebral apoplexy, not only can be used for removing thrombus effectively for several times but also can be used for catching small thrombus flowing to distal end so as to prevent distal blood vessels from getting blocked; and the stent can be used for dilating stenosis or blocked brain blood vessel or peripheral blood vessel, so as to take an effect of dredging and reconstructing a blood flow. The stent can be repositioned and released, with high controllability; and the stent can be used for reducing operation difficulty and greatly improving an operation success rate.

The present invention includes a radiopaque stent comprising a cylindrical main body. The tubular main body comprises a cobalt chromium alloy that comprises cobalt, chromium and one or more radiopaque materials.

The invention relates to a magnetic-navigation joint type puncture needle which comprises a head section and needle sections, wherein, the head section is made of stainless steel material with high magnetic conductivity and is connected with the following needle sections coaxially mounted with the head section through a flexible joint; two needle sections are also coaxially connected with each other through a flexible joint; the needle sections are made of non-magnetic stainless steel material; the flexible joints adopts serpentine tubes formed by melting and engraving cobalt-chromium alloy through laser; and both the head section and the needle sections can be bent, but the flexibility of the head section and that of the needle sections are smaller than the flexibility of the flexible joints. According to the invention, an extra magnetic field force is used to cause the head section of the needle to deflect, so that the following purposes can be achieved that the insertion direction of the needle can be changed, and the other needle sections also deflect with the deflection of the head section; accurate navigation for and control over puncture path and puncture position when the puncture needle performs a non-direct channel puncture in a human body; the puncture needle provided by the invention can reach niduses which other types of puncture needles can not reach; the application scope of minimally invasive surgery is expanded; iatrogenic injuries can be reduced; and patients can be benefited.

The invention discloses a high-strength and high-toughness CoCrMoW alloy based on laser additive manufacturing and a preparation method of the high-strength and high-toughness CoCrMoW alloy. The preparation method comprises the following steps of (1) gas atomization powder preparing, wherein after CoCr alloy raw materials are molten together into melt, the melt is crushed by high-pressure inert gas into tiny liquid drops, and powder is formed after solidification and cooling; (2) blank additive manufacturing forming, wherein the powder is prepared into a formed blank through the laser additivemanufacturing technology; (3) strengthening and toughening heat treatment, wherein the formed blank is subjected to strengthening and toughening heat treatment to obtain the high-strength and high-toughness CoCrMoW alloy based on laser additive manufacturing, the yield strength of the alloy reaches up to 0.9 GPa or above, the tensile strength of the alloy reaches up to 1.2 GPa or above, and the ductility of the alloy reaches up to 14% or above; and (4) plastifying and toughening heat treatment, wherein the high-strength and high-toughness CoCrMoW biological alloy obtained in the step (3) canbe subjected to subsequent plastifying and toughening heat treatment, the plasticity of the high-strength and high-toughness CoCrMoW biological alloy based on laser additive manufacturing can be further improved, and the plasticity of the high-strength and high-toughness CoCrMoW biological alloy based on laser additive manufacturing can reach 26% or above on the premise of guaranteeing that the tensile strength is 1.1 GPa or above.

The invention discloses an antifriction and toughening metal/ceramic bionic multilayer-film artificial joint, comprising an artificial joint matrix (1). The artificial joint matrix is made of materials such as stainless steel, nickel-titanium shape memory alloy, medical titanium alloy or cobalt-chromium alloy. The artificial joint is characterized in that a bionic multilayer film grows on the surface of the artificial joint matrix (1) and is formed in the way that soft metal film layers (2) and hard ceramic film layers (3) grow alternatively to each other, and the thickness of the bionic multilayer film ranges from 50nm to 30mum. According to the invention, the soft metal film layers (2) and the hard ceramic film layers (3) are sequentially deposited on the surface of the artificial joint matrix (1) by an ultrahigh vacuum magnetron sputtering method, thus forming the bionic multilayer film which is ordered and is controllable in thickness. The bionic multilayer film is small in layer friction factor, good in bioactivity and strong in fluid corrosion resistance, can effectively buffer damage on a coating by instantaneous impact, remarkably improves biocompatibility and tribology performance of the artificial joint, and reduces tissue reactivity and aseptic loosening of the artificial joint.

The present invention describes a metallographic erosion method for displaying a cobalt-chromium alloy structure, including: preparing aqua regia; placing the aqua regia at a certain temperature for a specified time to make the aqua regia reach the chroma meet the requirements; dipping in the aqua regia with a flexible material to wipe a sample, wherein the wiping time is 30-90 seconds; removing the surface aqua regia; and drying to get a etched sample surface. The method of the present invention is clearly, completely and accurately displays the metallographic structure of the cobalt-chromium alloy. The good erosion effect of the reagent is reflected by a test of a cobalt-chromium alloy human body implantable material. According to the present invention, the cobalt-chromium alloy etchant is prepared by a conventional metallographic etchant, good erosion effect of cobalt-chromium alloy is achieved by using that the erosion abilities of the etchant during different periods are different, thus a clear, complete and accurate metallographic structure is displayed.

A prosthetic joint ball is receivable in a prosthetic joint socket to form a prosthetic joint. The ball is generally spherical and is mounted on a stem. The outer rounded surface of the ball is provided with a layer of CVD diamond, prepared by mechanical polishing to present a surface with an RA of 20 nm or less. The ball is formed of a silicon carbide or similar substrate and includes a rounded recess. Mounted in the recess is a metal insert formed of a cobalt-chromium alloy or titanium alloy. The metal insert includes a socket shaped and sized to receive, in use, the tapered end of the stem.

The invention provides an asymmetric intravascular stent. The asymmetric intravascular stent comprises a plurality of annular supports and connecting ribs, wherein every two annular supports are connected through the corresponding connecting rib. The annular supports are arranged in the longitudinal direction of an intravascular stent body in sequence, and each annular support comprises a plurality of sinusoidal unit waves which are arranged in the circumferential direction of the intravascular stent body in sequence; the widths of the connecting ribs keep constant, the rib widths of the annular supports are regularly changed, that is, the rib widths of the annular supports are gradually increased from the upper ends and the lower ends to the middle ends at the same time, and in the axialdirection of the stent body, the rib widths of the annular supports are gradually increased from the far end to the near end. In the asymmetric intravascular stent, the characteristics that the circumferential thicknesses of the blood vessel are different and the axial thicknesses of the blood vessel are different are comprehensively considered, the adherence of the stent is improved, and the vascular stress and strain are reduced. Besides, a functionally graded material is adopted, while good supporting performance is ensured, the dog bone effects of a cobalt-chromium alloy stent and a stainless steel stent are greatly reduced, and the long-time curative effect of the stent is improved.

The invention discloses a method for 3D printing of a rapidly renewable cobalt-chromium alloy coated tooth. Laser scanning is adopted to assist manufacturing of an individual false tooth model, by using a 3D printing technique, zirconium dioxide powder is mixed with a small amount of graphene and carbon nanotube powder to make a false tooth main body, cobalt-chromium alloy powder is mixed with a small amount of the graphene and the carbon nanotube powder to make a false tooth base which is small and large gradually, and coating treatment is carried out on the false tooth base. The problems that a pure metal material is not attractive in appearance, a pure ceramic material is too crispy and long in recovery period after implanting can be overcome, people can feel that a false tooth and gingiva grow together, and an individual false tooth which is high in precision, good in wearing resistance, good in acid-alkali resistance, high in mechanical strength and good in biocompatibility can befinally manufactured.

The invention discloses cobalt-coated ceramic composite powder. The cobalt-coated ceramic composite powder is prepared by the following steps: adding ceramic powder into cobalt-containing lyosol, carrying out stirring and foaming in the presence of a long-acting particle foam stabilizer to obtain a suspension in which ceramic foam stably exists, adding a precipitator into the suspension, carryingout gel reaction to obtain coated ceramic particle precursor powder, and reducing the coated ceramic particle precursor powder to obtain the cobalt-coated ceramic composite powder with a core-shell structure. The cobalt-coated ceramic composite powder is added into cobalt-chromium alloy powder, the cobalt-coated ceramic modified cobalt-based composite material for dentistry can be obtained and used for preparing a false tooth metal inner crown through selective laser melting forming, the coefficient of thermal expansion is low, and the cobalt-coated ceramic composite material is resistant to abrasion and good in tensile property.

The invention relates to an etching agent for cobalt-chromium alloy and a method using the etching agent to acquire a metallographic structure. The etching agent comprises an acid etching agent and analkaline etching agent which are used independently, wherein the acid etching agent is an acid solution mixed by 40wt% hydrofluoric acid and 65-68wt% nitric acid according to the volume ratio of 1:(50-100), and the alkaline etching agent is an aqueous solution dissolved with 5-10wt% potassium ferricyanide and 5-10wt% sodium hydroxide. A cobalt-chromium alloy sample is soaked in the acid etching agent for not less than 5 hours and then soaked in the alkaline etching agent for not less than 0.5 hour, a prepared cobalt-chromium alloy metallographic sample is evident in microstructure and clear and complete in metallographic structure grain boundary contour, the clear cobalt-chromium alloy metallographic structure can be acquired fast, and the accuracy of the observation and analysis of the metallographic structure is increased.

A working wire for a biological sensor is disclosed. The working wire includes a substrate comprising cobalt-chromium (Co—Cr) alloy or Nitinol alloy, a platinum layer comprising platinum on the substrate, and a membrane layer comprising a biological membrane applied over the platinum layer.

The invention discloses a preparation method of nickel coated ceramic composite powder based on selective laser melting molding. The preparation method comprises the following steps of etching ceramicpowder by an etching liquid composed of formic acid and hydrogen peroxide; then sensitizing and activating the etched ceramic powder by a conventional method; and putting the ceramic powder in a chemical nickel-plating solution to react to obtain uniformly coated nickel coated ceramic composite powder. The nickel coated ceramic composite powder prepared by the invention is uniform in size distribution and high in quality of a nickel plate. A cobalt-chromium alloy is modified by the nickel coated ceramic composite powder. A cobalt-chromium alloy part is prepared by selective laser melting molding. The wear rate of the cobalt-chromium alloy part is lower than that of a common cobalt-chromium alloy, and the hardness and tensile strength of the cobalt-chromium alloy part are superior to thoseof the common cobalt-chromium alloy, so that the cobalt-chromium alloy part is suitable for being used as an orthopaedic implant, in particular artificial hip joint prosthesis.

The invention discloses a transforaminal nanometer-bioglass-coating minimally-invasive fusing device. The minimally-invasive fusing device comprises a body stretching net, and the surface of the body stretching net is coated with an ordered nanometer-mesoporous biological activity glass coating. The body stretching net is formed by cobalt-chromium alloy wires. A nanometer biological glass coating material is prepared from SiO2 sol, CaO sol and P2O5 sol, attachment of osteoblast and growing of blood vessels can be achieved through the biological glass coating, and bone fusion between centrums is promoted. The minimally-invasive fusing device can be applied to the lumbar vertebra fusing technology conducted under a foramen intervertebrale mirror. The transforaminal nanometer-bioglass-coating minimally-invasive fusing device has the advantage of being extensible in minimally invasive technology, is used in cooperation with a saccule, the saccule and the net-shaped fusing device with which the surface of the saccule is covered are expanded at the same time, intervertebral space with narrow reset is opened, extension of the net-shaped fusing device along the outline of an end plate reaches the estimated height, then the elliptic-cylinder-like shape is shown, the obtained the net-shaped fusing device and the outline of an end plate are completely matched, the saccule is pulled out, the fusing device is reserved in the intervertebral space, the intervertebral space is supported, and the transforaminal nanometer-bioglass-coating minimally-invasive fusing device can be applied to the lumbar vertebra fusing technology conducted under the foramen intervertebrale mirror for curing lumbar spine instability.

The invention discloses a production method of cobalt-chromium-alloy-based spherical niobium carbide powder. The production method comprises the steps of 1, drying cobalt-chromium alloy with the grainsize ranging from 45 microns to 150 microns and spherical niobium carbide with the grain size ranging from 45 microns to 150 microns for 2-4 hours at the temperature of 110-130 DEG C, wherein the spherical niobium carbide is prepared through a plasma method, and the content of niobium carbide is greater than 99%; 2, adding, by weight percentage, 50%-80% of the cobalt-chromium alloy and 20%-50% ofthe spherical niobium carbide into a three-dimensional powder mixer, wherein the rotating speed of the three-dimensional powder mixer is 15-20 r/min, and the time is 90-120 min; and 3, collecting thecobalt-chromium-alloy-based spherical niobium carbide powder. According to the production method of the cobalt-chromium-alloy-based spherical niobium carbide powder, operation is easy and convenientto conduct, the production cost is low, and industrialization is easy to achieve; the obtained cobalt-chromium-alloy-based spherical niobium carbide powder is good in flowability and suitable for massproduction; when the cobalt-chromium-alloy-based spherical niobium carbide powder is used as a coating, the problem that cracking is caused due to segregation is not likely to be generated; and the cobalt-chromium-alloy-based spherical niobium carbide powder is resistant to high temperature, corrosion and abrasion and can be applied to a plasma transferred arc surfacing process or a thermal spraying process, and the good commercial value is achieved.

The invention discloses a laser selective melting cobalt chromium alloy false tooth infrared heating annealing heat treatment method, and belongs to the technical field of heat treatment. The method comprises the following steps that a cobalt chromium alloy false tooth formed through laser selective melting is placed in a tubular infrared heating furnace, the cobalt chromium alloy false tooth is subjected to annealing heat treatment by adopting infrared heating, a thermal insulation temperature of infrared heating annealing heat treatment is 850-1050 DEG C, thermal insulation time of the infrared heating annealing heat treatment is 5-25 min, furnace cooling is firstly conducted to 300 DEG C, and then the tooth is taken out to be subjected to air cooling to a room temperature. Compared withthe mode that a resistance wire is used to heat the cobalt chromium alloy false tooth through convective heat transfer, the method has the advantages that due to the fact that infrared heating conducts heat transfer through radiation, a heating speed is high, the thermal insulation time is short, and the heat treatment efficiency is high.

The invention belongs to the field of orthodontic techniques, and particularly relates to a tongue-side invisible tooth bracket and a processing method thereof. The bracket is formed through 3D printing, and includes a bracket bottom plate and a bracket main body. The bracket bottom plate includes a tooth-side surface and a tongue-side surface. The tooth-side surface is a curved surface adapted to a tongue-side tooth curved surface. The tongue-side surface is provided with the bracket main body. The bracket main body is provided with a slot through which an arch wire passes. A three-dimensional modeling technique is adopted to carefully design the size and shape of the tongue-side bracket. A cobalt-chromium alloy is adopted as a raw material and subjected to 3D printing forming. The fitness degree between the processed curved surfaces and a tooth surface is high so that beauty and the comfort level of an appliance are greatly improved.

The invention is applicable to the technical field of materials, and provides a preparation method for selective laser melting of a cobalt-chromium alloy and a cobalt-chromium false tooth alloy material. The method comprises the steps that the cobalt-chromium alloy is placed in selective laser equipment for melting treatment, and the technological parameters of selective laser melting are as follows: the laser power is 200-400 W, the spot diameter is 0.01-0.05 mm, the scanning speed is 500-700 mm/s, and the powder laying layer thickness is 0.01-0.03 mm; and the cobalt-chromium alloy subjected to selective laser melting treatment is put into a vacuum furnace, the temperature is increased to 800-1100 DEG C at the temperature increasing speed of 100-120 DEG C/min, heat preservation is conducted for 20-50 min, annealing treatment is conducted, and cooling is conducted along with the temperature. The high-precision cobalt-chromium false tooth alloy material can be formed, the error generated in the X direction is 0.1-0.27%, the error generated in the Y direction is 0.2-0.3%, the error generated in the Z direction is 0.3-0.5%, and the cobalt-chromium false tooth alloy material has excellent mechanical properties.