WO2016200288A1 - Способ формирования биоактивного покрытия на поверхности эндопротезов крупных суставов - Google Patents
Способ формирования биоактивного покрытия на поверхности эндопротезов крупных суставов Download PDFInfo
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- WO2016200288A1 WO2016200288A1 PCT/RU2015/000933 RU2015000933W WO2016200288A1 WO 2016200288 A1 WO2016200288 A1 WO 2016200288A1 RU 2015000933 W RU2015000933 W RU 2015000933W WO 2016200288 A1 WO2016200288 A1 WO 2016200288A1
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- electrolyte
- titanium
- anode
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- implant
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/02—Inorganic materials
- A61L27/04—Metals or alloys
- A61L27/06—Titanium or titanium alloys
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/28—Materials for coating prostheses
- A61L27/30—Inorganic materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/28—Materials for coating prostheses
- A61L27/30—Inorganic materials
- A61L27/32—Phosphorus-containing materials, e.g. apatite
Definitions
- the method relates to the production technology of medical devices.
- the proposed method of forming coatings is intended to be implemented on the scale of serial production of large joint endoprostheses with improved biological compatibility, which are used in operations to replace the affected joint with an artificial one in the event of a surgical solution to the problem.
- the goal of coating formation is to reduce the risk of denture rejection and reduce the injury rate of operations.
- MDO microarc oxidation
- a known method according to patent P ⁇ 2385740 (Published on 04/10/2010) "Bioactive coating on an implant made of titanium and a method for its preparation", which allows to form a bioactive coating on an implant made of titanium with high adhesion to the implant surface and a developed rough surface sufficient for successful osseointegration of bone tissue and the method for its preparation.
- the bioactive coating on a titanium implant contains calcium phosphate compounds and has a multi-level porous structure with a rough surface.
- the coating has a thickness of 10-40 microns, a total porosity of 35-45% with an average pore size of 3-8 microns, a roughness of 2.5-5 microns, an adhesive strength of 30-35 MPa.
- the coating contains calcium phosphates in an X-ray amorphous state.
- Sandblasting is carried out using alumina powder A1 20 Oz or silicon oxide Si0 2 fractions of 250-380 microns to obtain a roughness of 1.5-5 microns.
- Chemical etching is carried out by etching the surface of a titanium implant in an acid etchant heated to boiling point, based on hydrochloric and sulfuric acids, of the following composition: 10 parts of HC1 (30%) and 80 parts of H 2 S0 4 (60%) and 10 parts of H 2 0, with the formation of pores with a size of 1-2 microns.
- Microarc oxidation is carried out in the anode mode with the following parameters: voltage 250-300 V, pulse duration 50-100 ⁇ s, and pulse repetition rate 50-100 Hz, for 3-10 minutes in an aqueous solution of an electrolyte based on phosphoric acid, hydroxyapatite and calcium carbonate, of the following composition, wt.%: H 3 P0 4 - 20, Ca 10 (PO) 6 (OH) 2 - 6, CaCO 3 - 9
- the disadvantage of this method is the presence of the stage of acid etching in a boiling mixture of acids, which translates the process into the category of hazardous chemical industries and imposes a number of relevant requirements and restrictions. It should also be noted high concentrations of chemicals in the electrolyte. So, for processing a dimensional product (for example, a leg of a hip prosthesis), you will need a bath capacity with an electrolyte of at least 3 liters, and the amount of hydroxyapatite for an electrolyte - about 180 grams, which in accordance with market prices for it will be at least 5 thousand. rub. to the bath.
- calcium hydroxyapatite actively reacts with phosphoric acid with the absorption of more acidic calcium phosphates, such as tricalcium phosphate, brushite and others.
- acidic calcium phosphates such as tricalcium phosphate, brushite and others.
- the authors' choice in favor of expensive hydroxyapatite as a starting component is not clear if, upon receipt of the electrolyte, it is converted to other more accessible components.
- a patent of the Russian Federation is also known> 444376 C1 (Published: 03/10/2012), which describes a method for applying a bioactive coating on titanium and its alloys at a constant or pulsed current voltage of 80-250 volts under conditions of a spark discharge with a pulse repetition rate of 0.3-15 , 0 Hz for 10-40 minutes
- Process lead to a solution of phosphoric acid with a concentration of 5-25% and sulfuric acid with a concentration of 5-10%, a supersaturated CaO solution, and a 5-10% suspension of hydroxylapatite with a dispersion of less than 70 microns in this supersaturated solution.
- the surface of the implant before being introduced into the body for 30-60 minutes at a temperature of 20-37 ° C is treated with a special medium with osteogenic and antimicrobial activity.
- the method provides for the application of a bioactive nano- and microstructured calcium phosphate coating on titanium implants with enhanced osteoconductive, osteoinductive properties and antimicrobial activity.
- the disadvantage of this method is the high content of acids in the electrolyte, which are neutralized by quicklime (CaO), as well as the high content of expensive hydroxyapatite (5-10%).
- the mixing of the electrolyte leads to the release of a large amount of heat during the extinguishing of lime and its reaction with acids. Technologically, this operation should be carried out using special reactors and requires additional safety measures, which complicates and leads to an increase in the cost of the process.
- the invention is aimed at solving the problem of metalloses due to coatings obtained on the surface of implants by microarc oxidation.
- the method includes the step of preparing metal billets, washing and drying, the stage of microarc oxidation to obtain micro-nanoporous bio-coatings to form an implant of the root of the tooth, and the final stage of washing from electrolyte residues.
- biologically active elements such as silicon, calcium, phosphorus and sodium, which are the main components of biological glass, is intended to reduce the healing time.
- the method includes a description of the design of the implant, consisting of a root part with a coating obtained by the method of microarc oxidation, and a holder installed in the implant of the tooth root by means of a screw.
- the root implant is made of pure titanium grades TA2, TA4 or titanium alloy T2448.
- Microarc treatment is carried out in an electrolyte containing sodium silicate, calcium dihydrogen phosphate, calcium acetate, a2-EDTA and sodium hydroxide when supplied rectangular anode pulses with a voltage of 250 + 550 V, a frequency of 0.2-ChkHz and a duty cycle of 4-20%, for 5-15 minutes
- the disadvantages of this object include the following.
- the bioactive properties of the resulting coatings are confirmed only indirectly (only the result of a three-day test in SBF modeling fluid without using in vivo or in vitro experiments is given).
- Both in the abstract and in the examples there is no information on such important parameters of the obtained coating as thickness, composition, porosity, adhesion, and other physicochemical properties that could indicate the potential use of such coatings for real implants. In addition, it cannot be used to handle large implants.
- the closest in its characteristics adopted for the prototype is the method of forming a bioactive coating, disclosed in the source US 2011/0218643 A1 (publ. 08.09.2011), designed to form a coating on the intraosseous implants made of titanium and titanium alloys, which increases their biological activity.
- the implant is placed in a bath in an electrolyte solution containing Ca and P ions, and then connected to a power source.
- An auxiliary electrode is also connected to the power source.
- a heat exchanger is used to cool the electrolyte.
- a sequence of voltage pulses is applied with alternating polarity of the pulses.
- a coating is formed with a thickness of 10 to 30 ⁇ m, a porous structure with pore sizes of 0.5 to 10 ⁇ m and containing from 10 to 30 May. % hydroxyapatite.
- the coating contains titanium dioxide in the form of anatase and rutile crystallites with a size of 30-50 nm.
- a high level of porosity provides good osteoconductivity, resulting in increased bone-implant adhesion. It is argued that a uniform coating structure and bone ingrowth into it should lead to a gradual change in the mechanical properties of the bone-implant system, thereby eliminating the appearance of stress concentrators and increasing shear strength.
- the duration of voltage pulses during processing is 0.5-20 milliseconds.
- the pause between pulses is less than 10 microseconds.
- the pause duration is reduced to increase the amount of calcium and phosphorus in the coating.
- the amplitude of the pulse voltage increases gradually to its peak values during the first 5,300 seconds, which helps to avoid high peak current values at the beginning of the process.
- the amplitude of positive voltage pulses should not exceed 500-550 V, and negative ones - 100 V, since overvoltage causes powerful discharges to occur in places of concentration of electric field lines (edge protruding regions).
- the electrolyte includes an aqueous solution of calcium acetate (0.05-0.2 mol / L) and sodium phosphate (0.025-0.1 mol / L).
- the disadvantage of the prototype method is that it cannot be used in the manufacture of large joint endoprostheses with a significant surface area, especially when a batch of samples is being processed.
- hard mode use the forced start of the breakdown by applying a voltage, obviously exceeding the critical value, and the forced end of the breakdown by turning off the voltage.
- the average current density through the surface of the sample according to the proposed method can reach 5 A / cm for pulses of positive (anode) polarity, especially at the initial stage.
- the area of the treated surface for only one element of the prosthesis of the hip joint can reach 0.6 DM 2 and the average anode current, respectively, for processing such a part 300A.
- this parameter will already exceed 1000A. Ensuring reliable electrical contact for the flow of currents of such values will become a significant obstacle when connecting elements of a standard endoprosthesis to a current source and will require its development. It should also be noted that high-frequency currents of such a force induce significant magnetic fields and interfere with the power supply network.
- the prototype shows a sample with an area of only 2x2 cm 2 , the processing of which, according to the data of the given oscillogram, requires an average period (anode + cathode pulses) more than 2 kW of power.
- the objective of the invention is to develop a method of forming a bioactive coating on the surface of endoprostheses of large joints of a person with high physicochemical properties and biochemical activity by microarc oxidation for use in mass production.
- the technical result of the invention is to reduce the average current density and the use of a soft anode-cathode mode of formation of bioactive coatings, which makes it possible to batch process elements of endoprosthesis of large joints of a person to obtain a porous bioactive glass-ceramic coating on the entire or given surface of endoprosthesis elements made of the most used titanium alloys VT 1 -0 (Grade 2,3,4), VT6 (Ti-6A1-4V) and Ti-6Al-7Nb.
- the problem is solved by the proposed method for producing coatings on the elements of endoprostheses of large human joints made of titanium and its alloys, including placing the implant in a bath with an electrolyte solution containing Ca and P ions, connecting the implant and an auxiliary electrode to a power source, cooling the electrolyte with a heat exchanger, characterized in , what
- the electrolyte is prepared as follows: completely dissolve calcium hydroxide, add sodium metasilicate and mix until a white dispersed suspended precipitate forms, add sodium hydrogen phosphate and mix until it is completely dissolved;
- an electrolyte is prepared based on the dry matter mass in grams per liter of composition: Ca (OH) 2 - 1.6; Na 2 Si0 3 > ⁇ 5H 2 0 - 8.0; Na 2 HPO 4 xl2H 2 O - 5.0;
- the initial electrolyte used for titanium grade VT1-0 (Grade 2,3,4) is diluted with distilled water in the ratio of 2 parts of electrolyte and 1 part of water;
- masking insulating equipment based on polyvinylsiloxane silicone additive curing is used, the use of which avoids negative edge effects and reduces the quality of the coating at the border with masking equipment;
- microarc oxidation is carried out for 10-30 minutes in a soft anode-cathode mode with a sinusoidal current shape with a density of 0.1 ⁇ 0.02 A / cm except for the initial stage, when the anode mode of inclusion is used in the first minute at the ratio of the anode and cathode currents of at least 10: 1.
- the claimed technical result is achieved by combining the composition of the electrolyte and the electrical parameters of microarc oxidation.
- the proposed electrolyte components are sources of elements such as calcium, phosphorus and silicon, which form a glass-ceramic coating during the oxidation of the substrate with the thermal effects of microarc discharges, some regions of which are similar to bioactive glass of various compositions [HenchL.L., SplinterR.J., AllenW. C. andGreenleeT.K. (1971). Bonding Mechanism at the Interface of Ceramics Prosthetic Materials. J. Biomed. Mater. Res. Symp., 2: 117-141 .;].
- the content in the electrolyte of a dispersed precipitate from a mixture of calcium phosphates and silicates largely determines the saturation with calcium, phosphorus and silicon of the resulting coating.
- the thickness of the resulting coating at an average current density of 0.1 A / cm 2 can vary from 10 to 35 microns with processing times of 10 to 30 minutes.
- the adhesive strength is at least 30 MPa. With a processing time of more than 30 minutes, thicker coatings can be obtained, but at the same time, adhesion deterioration occurs.
- the roughness of the coatings is in the range of Ra b microns. With a maximum pore diameter of up to 20 ⁇ m, the main contribution to porosity is made by pores from 1 to 10 ⁇ m.
- each average processing current will be about 25A, while when processing four products of the same area according to the prototype, this parameter will exceed 1000A.
- the claimed invention meets the conditions of novelty, inventive step and industrial applicability.
- the invention is characterized by the following graphic materials.
- the figure 1 presents the results of transmission microscopy, confirming the presence of amorphous glass phase in the coating along with nanodisperse crystallites of titanium oxide.
- the figure 2 presents the elemental composition of the dispersed precipitate in the electrolyte, which takes part in the formation of the coating obtained by the method of energy dispersive analysis;
- the figure 3 shows a graph depicting a characteristic waveform of the voltage and current waveform with a processing time of 10 minutes for a sample area of 10 cm 2 '.
- the maximum current does not exceed 4 A, and in the prototype - over 25 A for a sample with an area of 4 cm 2 .
- the average current for the period is about 1 A against 10 A for the prototype.
- the figure 4 presents the appearance of the element of the prosthesis of the hip joint - the cavity of cementless fixation of size 58C, made of technically pure titanium grade 1-0 with the coating obtained according to example 1.
- the figure 5 presents the appearance of the element of the prosthesis of the hip joint - BCF-143 leg, made of titanium alloy VT6 (Ti-6A1-4V) with the coating obtained according to example 2.
- the figure 6 presents the image of a fragment of osteoid tissue (bottom) grown on the surface of the coated implant BT6, surrounded by fibers of loose connective tissue (top).
- the analysis of histological preparations was carried out by standard methods of light microscopy of thin sections.
- Example 1 As a product for processing, an element of the hip joint prosthesis is taken - a cavity of cementless fixation of size 58C made of technically pure titanium of grade VT 1-0. For the initial surface, sandblasting with white electrocorundum with a grain of F16 according to GOST R 52381-2005 was carried out. Products were washed before oxidation using VEGA-R technical detergent. Using ElitDouble 22 silicone, Zhermack made insulating fittings.
- the process was carried out in Ca (OH) 2 electrolyte - 1.6 g / l; Na 2 Si0 3 x5H 2 0 - 8.0 g / l; Na 2 HP0 4 * 12H 2 0 - 5.0 g / l for 30 minutes.
- the average current density was 0.1 A cm 2 .
- Elemental composition (wt.%): TU 2 - 52.2; CaO - 12.3; P 2 0 5 - 3.9; Si0 2 - 30.5; Na 2 0
- Example 2 As a product for processing, an element of the hip joint prosthesis is taken - the BTsF-143 leg, made of VT6 titanium alloy (Ti-6A1-4V). For the initial surface, sandblasting with white electrocorundum with grain size F16 was carried out. The products were washed before oxidation using the VEGA-R technical detergent. Using ElitDouble 22 silicone, Zhermack made insulating fittings. For of the process, the initial electrolyte in example 1 was diluted with distilled water in a ratio of 2 parts of electrolyte and 1 part of water, processing was carried out for 30 minutes. The average current density is 0.1 A / cm 2 .
- Elemental composition (wt.%): TU 2 - 32.0; CaO - 35.6; P 2 0 5 - 8.6; Si0 2 - 21.6; A1 2 0 3 - 0.9; Na 2 O - l, 3.
- Adhesion Shear Strength 34 MPa.
- Example 3 As an object for processing were taken cylindrical samples with a diameter of 19.5 mm and a length of 40 mm, made of titanium alloy Ti-6Al-7Nb. For the initial surface, sandblasting with white electrocorundum with grain size F16 was carried out. The preforms were washed before oxidation using the VEGA-R technical detergent. The coating was formed over the entire area of the sample. To carry out the process, the initial electrolyte in Example 1 was diluted with distilled water in a ratio of 2 parts of electrolyte and 1 part of water, processing was carried out for 30 minutes. The average current density is 0.1 A / cm 2 .
- Elemental composition (Weight.%): TU 2 - 35.7; CaO - 33.0; P 2 0 5 - 9.4; Si0 2 - 19.4; A1 2 0 3 - l, 0; Na 2 O -0.9.
- Adhesion Shear Strength 31 MPa.
- Example 4 As an object for processing were taken 3 samples in the form of disks with a diameter of 20 mm and a height of 5 mm with a total area of all samples of 28 cm, made of titanium grade VT 1-0. The surface of the samples was pre-ground with an abrasive sand grain size according to the FEPA P320 scale. The preforms were washed before oxidation using the VEGA-R technical detergent. The coating was formed over the entire area of the samples. For the process used the electrolyte of example 1, the processing was carried out for 10 minutes. The average current density is 0.1 A cm2. Characteristics of the resulting coating:
- volumetric porosity 15% ⁇ 3%
- Coating thickness 11 microns ⁇ 2 microns
- Elemental composition (wt.%): Ti02 - 68.5; CaO - 7.4; P205 - 5.3; Si02 - 18.8.
- Adhesion Shear Strength 31 MPa.
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Veterinary Medicine (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Public Health (AREA)
- Life Sciences & Earth Sciences (AREA)
- Epidemiology (AREA)
- Inorganic Chemistry (AREA)
- Dermatology (AREA)
- Medicinal Chemistry (AREA)
- Cardiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Prostheses (AREA)
- Materials For Medical Uses (AREA)
Abstract
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Priority Applications (1)
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IL255808A IL255808B (en) | 2015-06-11 | 2017-11-21 | Method for forming a bioactive coating on the surface of major joint endoprostheses |
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RU2015122349 | 2015-06-11 | ||
RU2015122349/15A RU2598626C1 (ru) | 2015-06-11 | 2015-06-11 | Способ формирования биоактивного покрытия на поверхности эндопротезов крупных суставов |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110151364A (zh) * | 2019-07-01 | 2019-08-23 | 广东省新材料研究所 | 一种髋关节假体柄结构及其制备方法 |
CN113500194A (zh) * | 2021-06-17 | 2021-10-15 | 西安理工大学 | 一种有序多级孔结构钽骨植入体的制备方法 |
Families Citing this family (1)
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RU2630578C1 (ru) * | 2016-10-31 | 2017-09-11 | федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" | Способ модифицирования поверхности титановых имплантатов |
Citations (3)
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RU2385740C1 (ru) * | 2008-09-17 | 2010-04-10 | Учреждение Российской Академии Наук Институт Физики Прочности И Материаловедения Сибирского Отделения Ран (Ифпм Со Ран) | Биоактивное покрытие на имплантате из титана и способ его получения |
RU2423150C1 (ru) * | 2009-11-23 | 2011-07-10 | Государственное образовательное учреждение высшего профессионального образования "Томский политехнический университет" | Кальций-фосфатное биологически активное покрытие на имплантате и способ его нанесения |
US20110218643A1 (en) * | 2007-10-25 | 2011-09-08 | Aleksey Yerokhin | Method of Forming a Bioactive Coating |
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2015
- 2015-06-11 RU RU2015122349/15A patent/RU2598626C1/ru active
- 2015-12-28 WO PCT/RU2015/000933 patent/WO2016200288A1/ru active Application Filing
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- 2017-11-21 IL IL255808A patent/IL255808B/en active IP Right Grant
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Publication number | Priority date | Publication date | Assignee | Title |
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US20110218643A1 (en) * | 2007-10-25 | 2011-09-08 | Aleksey Yerokhin | Method of Forming a Bioactive Coating |
RU2385740C1 (ru) * | 2008-09-17 | 2010-04-10 | Учреждение Российской Академии Наук Институт Физики Прочности И Материаловедения Сибирского Отделения Ран (Ифпм Со Ран) | Биоактивное покрытие на имплантате из титана и способ его получения |
RU2423150C1 (ru) * | 2009-11-23 | 2011-07-10 | Государственное образовательное учреждение высшего профессионального образования "Томский политехнический университет" | Кальций-фосфатное биологически активное покрытие на имплантате и способ его нанесения |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110151364A (zh) * | 2019-07-01 | 2019-08-23 | 广东省新材料研究所 | 一种髋关节假体柄结构及其制备方法 |
CN113500194A (zh) * | 2021-06-17 | 2021-10-15 | 西安理工大学 | 一种有序多级孔结构钽骨植入体的制备方法 |
CN113500194B (zh) * | 2021-06-17 | 2023-06-20 | 西安理工大学 | 一种有序多级孔结构钽骨植入体的制备方法 |
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RU2598626C1 (ru) | 2016-09-27 |
IL255808A (en) | 2018-01-31 |
IL255808B (en) | 2021-02-28 |
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