CN109938818B - Degradable magnesium alloy patella claw and preparation method thereof - Google Patents
Degradable magnesium alloy patella claw and preparation method thereof Download PDFInfo
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- CN109938818B CN109938818B CN201910025329.6A CN201910025329A CN109938818B CN 109938818 B CN109938818 B CN 109938818B CN 201910025329 A CN201910025329 A CN 201910025329A CN 109938818 B CN109938818 B CN 109938818B
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Abstract
The invention is a degradable magnesium alloy patella claw and its preparation method, the said magnesium alloy patella claw is prepared from magnesium or magnesium alloy that can be degraded and absorbed, the said magnesium alloy patella claw includes a first claw part and shape and size and match with the first claw part, and can be mounted and a second claw part in the first claw part correspondingly, the first claw part and the second claw part can be blocked each other selectively by adjusting a shrapnel; the degradable magnesium alloy patella claw can be fixed on an affected part and is not easy to separate, the degradable magnesium alloy patella claw is firmly fixed, good alignment and stabilization effects are achieved for maintaining patella fracture, secondary taking-out operation is not needed after fracture healing based on the degradable characteristic of magnesium alloy materials, and pain and economic burden of a patient can be greatly relieved.
Description
Technical Field
The invention relates to a medical instrument, in particular to a degradable magnesium alloy patella claw and a preparation method thereof.
Background
The patella is an important component of the knee joint, is the largest seed bone in the human body, and is one of the more vulnerable bones in the human body. During the knee stretching activity, the patella can improve the force of quadriceps femoris muscle by about 30% through the lever action, and particularly, the effect of the patella is more important when the last 10-15 degrees of the knee joint are straightened, and if the patella is not properly treated after fracture, complications such as joint stiffness, rigidity, bone block separation, traumatic arthritis and the like are easy to occur, and even the lifetime disability is caused. As patella resectioning can result in permanent knee joint function limitation, knee extension is diminished and quadriceps atrophy can result. Therefore, the integrity of the patella should be kept as much as possible after the fracture of the patella, the patella resection is not advocated, and the patella fracture fixation operation should be performed as soon as possible.
The traditional patellar fracture fixation operation mostly adopts patellar claws for fixation, and is proved by biomechanics to have the principle of tension band action. The existing clinically common patella claw is basically prepared from stainless steel, titanium and titanium alloy materials or nickel-titanium memory alloy materials, is in an integrally formed claw shape similar to four to five crab-leg-shaped claws, and can generate strong grabbing and gathering force on the periphery of the patella through the crab-leg-shaped design, so that the good alignment, stabilization and fixation effects of maintaining the fracture of the patella are achieved, and fracture healing of the fractured patella and recovery of subsequent knee joint functions are facilitated.
However, the biggest problem of the patella claw prepared by the traditional materials is that after the fracture is healed, the patella claw needs to be kept in the body, local soft tissue degeneration is generated on the body for a long time, synovitis, effusion and other problems harmful to the body are easily formed, the knee is further uncomfortable, and the function of the knee joint is partially even affected.
Disclosure of Invention
In order to solve the above problems, the present invention provides a degradable magnesium alloy patella claw and a method for manufacturing the same, which can effectively grip and clamp a fractured patella after fixation, so as to maintain a good positioning and stabilizing effect, and facilitate fracture healing and recovery of subsequent knee joint functions. And can be gradually and biologically degraded in vivo after fracture healing, and secondary taking-out operation is not needed.
The invention provides a degradable magnesium alloy patella claw, which comprises:
the magnesium alloy patella claw is prepared from degradable and absorbable magnesium or magnesium alloy, and comprises
The first claw piece comprises a bearing part and more than one bone claw which is connected with one side of the bearing part and forms a bending shape, wherein the bearing part is provided with an elastic spring sheet, a track, a limiting part arranged on the spring sheet and an adjusting piece linked with the limiting part;
the second claw piece is matched with the first claw piece in shape and size, can be correspondingly installed and slide in the track of the first claw piece, and comprises a sliding part and more than one bone claw arranged on one side of the sliding part, the second claw piece is movably and correspondingly arranged in the track of the first claw piece through the sliding part, a limiting area is arranged on the sliding part, the limiting area and the limiting part are in inverted tooth shapes, and the first claw piece and the second claw piece can be selectively and correspondingly clamped in the limiting area of the second claw piece through adjusting the adjusting piece by the limiting part of the elastic piece.
Preferably, the degradable magnesium alloy patella claw is formed by adopting the magnesium or magnesium alloy with the total mass of 100%, the magnesium content of 94-99%, the calcium content of 0.1-3%, the zinc content of 0.1-3% and the sum of the other impurities of not more than 0.01%.
Preferably, the degradable magnesium alloy patellar claw includes any one of pure magnesium, magnesium-zinc alloy, magnesium-calcium alloy, magnesium-zinc-calcium alloy, magnesium-lithium alloy, magnesium-strontium alloy, magnesium-calcium-strontium alloy, magnesium-zinc-lithium alloy, magnesium-zinc-manganese alloy, magnesium-neodymium alloy, magnesium-yttrium alloy, and magnesium-gadolinium alloy.
Preferably, the degradable magnesium alloy patella claw is characterized in that one end of the elastic sheet is a base part which is approximately circular, the other end of the elastic sheet horizontally extends out of a stopping part and the limiting part respectively, and a gap is formed between the stopping part and the limiting part to enable one side of the elastic sheet to generate elasticity.
Preferably, the degradable magnesium alloy patella claw is characterized in that the adjusting piece is in a cam shape and is arranged above the elastic piece, a slot is formed in the top surface of the adjusting piece for inserting and adjusting a tool, and the elastic piece can be compressed or loosened by rotating the adjusting piece.
Preferably, the degradable magnesium alloy patella claw, wherein the first claw part is provided with a positioning part at a side of the bearing part adjacent to the patella claw, the sliding part of the second claw part is provided with an opening, the position of the opening corresponds to the positioning part, and the limiting area is formed at a side of the opening of the sliding part.
The invention also provides a preparation method for preparing the degradable magnesium alloy patella claw, which comprises the following steps:
a step of ingot forming, which is to sequentially carry out vacuum melting on the degradable magnesium or the magnesium alloy to obtain an ingot;
a plate forming step, namely sequentially removing the surface defects of the magnesium alloy ingots obtained in the previous step and extruding the magnesium alloy ingots into plates;
rolling and forming, namely rolling and annealing the plate obtained in the previous step for multiple times to obtain a plate raw material with required thickness;
forming the patella claw, namely obtaining the shape contour structural component of the degradable patella claw by using the rolled plate in a numerical control milling machine, linear cutting or laser cutting, stamping and other modes;
and a post-treatment step, namely placing the bone claw of the patella claw prepared in the previous step into a directional annealing device for local instantaneous heating treatment, so that the hardness value of a bone claw material is lower than that of an original plate material after the directional annealing treatment, thereby enabling the bone claw to be conveniently shaped when in use and bent into a required angle according to the peripheral shape of the patella.
Preferably, in the step of ingot forming, the vacuum melting furnace is vacuumized and then filled with argon for protection, the pressure of vacuum melting is-0.02 to-0.03 Pa, the vacuum degree in the melting chamber after vacuumizing is 0.001 to 0.0001Pa, and the temperature of vacuum melting is 650 to 750 ℃.
Preferably, in the preparation method, in the step of forming the ingot, the ingot further comprises a homogenization heat treatment process, the heating temperature is 350-450 ℃, and the heat preservation time is 12-30 hours.
Preferably, in the preparation method, in the step of forming the plate, the extrusion pressure of the cast ingot is 10-15 Mpa, the extrusion speed is 0.2-2 mm/s, and the preheating temperature of the extrusion die is 200-250 ℃.
Preferably, in the preparation method, in the step of forming the plate, the ingot is preheated before extrusion, the preheating temperature is 300-450 ℃, the preheating time is 2-3 h, the extrusion temperature is 150-350 ℃, the extrusion ratio is 10-100, and the grain diameter of the extruded plate is less than or equal to 15 μm.
Preferably, in the preparation method, in the step of rolling and forming, the rolling temperature of the plate rolling method is 350-450 ℃, the heat preservation time is 30min before rolling, the pass processing rate is 10-30%, the pass intermediate annealing temperature is 150-350 ℃, the heat preservation time is not less than 10min, the thickness of the rolled plate is 0.2-3.5 mm, the mechanical properties of the rolled plate are yield strength greater than 130Mpa, tensile strength greater than 160Mpa and elongation greater than 5%, and the grain size obtained after rolling the plate is 2-10 μm.
Preferably, in the preparation method, the annealing temperature of the annealing process in the post-treatment step is 250-350 ℃, the heat preservation time is 0.5-2 hours, and the hardness of the annealed patellar claw is not higher than Hv 50.
Preferably, the preparation method further comprises an electrolytic polishing treatment in the post-treatment step, so as to remove surface oxides and impurities of the patellar claw.
The degradable magnesium alloy patella claw and the preparation method thereof mainly adopt the degradable magnesium alloy patella claw made of magnesium or magnesium alloy material, the magnesium alloy material has excellent comprehensive mechanical property performance, good surface quality, excellent corrosion resistance and degradation rate and meets the requirements of clinical use, the bone claw of the degradable magnesium alloy patella claw is firmly fixed, the first bone claw and the second bone claw can be adjusted to meet affected parts with different sizes, good contraposition and stabilization effects are achieved for maintaining the patella, the magnesium or magnesium alloy material can be degraded in vivo by self, so that the affected parts do not need to be taken out again after healing, and the pain and economic burden of patients can be greatly relieved.
Drawings
Fig. 1 is a perspective view of a first embodiment of the present invention.
Fig. 2 is a top view of the first embodiment of the present invention.
Fig. 3 is an exploded view of the first embodiment of the present invention.
Fig. 4 is a perspective sectional view of the first embodiment of the present invention.
FIG. 5 is a flow chart of the preparation method of the present invention.
Detailed Description
In order to understand the technical features and practical effects of the present invention in detail and to be implemented in accordance with the contents of the specification, further referring to the preferred embodiments shown in the accompanying drawings, as shown in fig. 1 to 4, a first preferred embodiment of the present invention is a degradable magnesium alloy patellar claw made of medical degradable magnesium or magnesium alloy, wherein the magnesium or magnesium alloy includes any one of pure magnesium, magnesium zinc alloy, magnesium calcium alloy, magnesium zinc calcium alloy, magnesium lithium alloy, magnesium strontium alloy, magnesium calcium strontium alloy, magnesium zinc lithium alloy, magnesium zinc manganese alloy, magnesium neodymium alloy, magnesium yttrium alloy, and magnesium gadolinium alloy, the total mass of the magnesium or magnesium alloy is 100%, the magnesium content is 94% to 99%, the calcium content is 0.1% to 3%, and the zinc content is 0.1% to 3%, the sum of the contents of the other impurities is not more than 0.01 percent.
As shown in fig. 1 to 4, the degradable magnesium alloy patella claw includes a first claw member 10 and a second claw member 20 capable of displacing relative to the first claw member 10; the first claw member 10 includes a bearing portion 11, at least one bone claw 12 connected to one side of the bearing portion 11 and forming a curved shape, and a resilient sheet 13, an adjusting member 14 and a fixing knob 15 respectively disposed on the bearing portion 11.
The bearing part 11 is a flat plate and forms a flange 110 with an inverted L-shaped cross section on two opposite sides, a rail 111 for the second claw member 20 to slide is formed between the flanges 110, a positioning part 112 is convexly disposed on one side of the bearing part 11 adjacent to the bone claws 12, and a blocking edge 113 parallel to the flange 111 is disposed on the flange 110 of the bearing part 11 adjacent to one side, preferably, the first claw member 10 is provided with two bone claws 12.
The elastic sheet 13 is disposed on the bearing portion 11 of the first claw member 10 and located at one side of the positioning portion 112, one end of the elastic sheet 13 is a substantially circular base portion 131, the other end of the elastic sheet horizontally extends from the base portion 131 to form a stopping portion 132 and a limiting portion 133, a gap is formed between the stopping portion 132 and the limiting portion 133 to enable one side of the elastic sheet 13 to generate elasticity, one side of the stopping portion 132 abuts against the blocking edge 113 of the bearing portion 11, and one side of the limiting portion 133 forms an inverted tooth shape.
The adjusting member 14 is cam-shaped and disposed above the elastic sheet 13, and a slot 141 is formed on the top surface for inserting a tool for adjustment, and the adjusting member 14 is rotated to compress or release the elastic sheet 13, so that the limiting portion 133 of the elastic sheet 13 can be separated from the limiting region 211 of the second claw member 20, and the first claw member 10 can be pulled out relative to the second claw member 20.
The fixing knob 15 and the elastic sheet 13 are integrally formed, and a round hole in the middle of the fixing knob 15 is matched with the cylinder on the bearing part 11 for limiting and fixing the elastic sheet 13.
The second claw member 20 has a shape and size matching the first claw member 10 and is capable of being correspondingly installed and sliding in the rail 111 of the first claw member 10, the second claw member 20 includes a sliding portion 21 and at least one bone claw 22 disposed on one side of the sliding portion 21, the sliding portion 21 of the second claw member 20 is capable of correspondingly extending into the rail 111 of the first claw member 10 and sliding in the rail 111 relative to the first claw member 10, one side of the sliding portion 21 is U-shaped and forms a substantially square opening 210, the position of the opening 210 corresponds to the positioning portion 112, so that the positioning portion 112 can suitably block the sliding of the second claw member 20, the sliding portion 21 forms a reversed-tooth-shaped limiting region 211 on one side of the opening 210, the limiting region 211 matches with the reversed-tooth shape of the limiting portion 133, so that the limiting portion 133 can be correspondingly engaged in the limiting region 211, preferably, the inverted tooth shape of the limiting region 211 and the limiting portion 133 is a one-way ratchet, so that the first claw portion 10 can be folded inwards relative to the second claw portion 20 without being opened, and the second claw member 20 is provided with three bone claws 22.
The degradable magnesium alloy patella claw of the invention is used in a way that, when in use, the adjusting piece 14 of the first claw piece 10 is rotated to compress the elastic piece 13, so that the limiting part 133 of the elastic piece 13 can be separated from the limiting area 211 of the second claw piece 20, the first claw piece 10 can be pulled outwards relative to the second claw piece 20, after correct alignment, the bone claws 12 and 22 of the first claw piece 10 and the second claw piece 20 are clamped on the periphery of the affected part, the first claw piece 10 and the second claw piece 20 are relatively closed, then the adjusting piece 14 is rotated to release the elastic piece 13, so that the first claw piece 10 and the second claw piece 20 are fixed on the affected part and are not easy to separate after the limiting part 133 is clamped with the limiting area, the degradable magnesium alloy patella claw of the invention is firmly fixed, has good alignment and stable effects on maintaining patella fracture, and is based on the degradable characteristics of the magnesium alloy material 211, after the fracture is healed, a secondary taking-out operation is not needed, so that the pain and the economic burden of a patient can be greatly relieved.
The invention also provides a preparation method of the degradable magnesium alloy patella claw, which comprises the following steps of: the method comprises the steps of ingot forming, plate forming, rolling forming, patella claw forming and post-processing.
And (3) ingot forming: the degradable magnesium or magnesium alloy is subjected to vacuum melting and homogenization heat treatment in sequence to obtain an ingot, the vacuum melting is preferably carried out in a vacuum melting furnace, the vacuum melting furnace is vacuumized and then filled with argon for protection, and the pressure of the vacuum melting is preferably-0.02 to-0.03 Pa. The vacuum degree in the vacuum-pumped smelting chamber is preferably 0.001-0.0001 Pa, and the vacuum smelting temperature is preferably 650-750 ℃, and more preferably 700-720 ℃.
Preferably, in the step of ingot forming, the ingot is further subjected to a homogenization heat treatment process, the heating temperature is 350-450 ℃, and the heat preservation time is 12-30 hours.
A plate forming step: sequentially removing surface defects from the cast ingot obtained in the previous step, and extruding the cast ingot into a plate, wherein the extrusion pressure of the cast ingot is preferably 10-15 MPa, and more preferably 12-14 MPa; the extrusion speed is preferably 0.2-2 mm/s; the preheating temperature of the extrusion die is preferably 200-250 ℃, and more preferably 220-240 ℃.
In the step of forming the plate, preferably, the ingot is preheated before extrusion, and the preheating temperature is preferably 300-450 ℃, and more preferably 350-400 ℃; the preheating time is preferably 2-3 h. The extrusion temperature is 150-350 ℃, the extrusion ratio is 10-100, and the grain diameter of the extruded sheet is less than or equal to 15 mu m.
A rolling forming step: the method comprises the steps of rolling and annealing the plate obtained in the previous step for multiple times to obtain a plate raw material with a required thickness, preferably, the rolling temperature of the plate rolling method in the step is 350-450 ℃, the temperature is kept for 30min before rolling, the pass processing rate is 10-30%, the pass intermediate annealing temperature is 150-350 ℃, the temperature is kept for not less than 10min, preferably, the thickness of the plate after rolling is 0.2-3.5 mm, the mechanical property of the plate after rolling is yield strength of 130MPa, tensile strength of 160MPa and elongation of 5%, and the grain size of the magnesium alloy plate obtained after rolling is 2-10 mu m.
Patella claw forming: the rolled plate is subjected to numerical control milling machine, linear cutting or laser cutting, stamping and the like to obtain the patella claw profile structural component.
Post-treatment: the bone claw of the patellar claw prepared in the previous step is placed into a directional annealing device for local instantaneous heating treatment, so that the hardness value of a bone claw material is lower than that of an original plate material after the directional annealing treatment, the bone claw can be conveniently shaped when in use and bent into a required angle according to the peripheral shape of the patellar, and the patellar claw can change the tissue structure of the material and reduce the hardness of the material by performing instantaneous heating annealing treatment by using the directional annealing device.
Preferably, the annealing temperature of the annealing process in the post-treatment step is 250-350 ℃, the heat preservation time is 0.5-2 hours, and the hardness of the annealed patellar claw is not higher than Hv 50.
Preferably, the post-processing step further comprises an electrolytic polishing process, so as to remove surface oxides and impurities of the patellar claw.
Compared with the titanium alloy patella claw or the nickel-titanium memory alloy patella claw which is generally adopted clinically at present, the patella claw prepared by the preparation method has the following beneficial effects:
the patellar claw can be automatically absorbed by a human body, and adverse effects such as foreign body reaction and the like do not exist after degradation. The patella claw has good biocompatibility, the shape of the patella claw is designed according to the characteristics of the degradable magnesium alloy, the structure is reasonable, the patella claw can be respectively shaped according to the peripheral shapes of the patella of different individuals, each different patella periphery can be effectively clamped and grasped, the fractured patella can be fixed, the good alignment and stabilization effects can be maintained, fracture healing of the patella is facilitated, and the patella claw can provide an effective fixing effect in a fracture healing period of about 3 months.
In the aspect of degradation speed, after the patella claw is soaked in Hank's simulated body fluid for 2 weeks, the degradation rate in vitro is about 0.8-1.5 mm/year, and the requirements of clinical functions on effectiveness and degradability can be met. The patella claw made of magnesium alloy can be degraded in vivo and absorbed by human body without taking out operation after recovery of the patient.
The embodiment of the preparation method of the degradable magnesium alloy patella claw of the invention is as follows:
a first example of the preparation method:
the raw material proportioning is carried out according to the following alloy raw materials that magnesium ingots with the purity of more than 99.9 percent are used as magnesium raw materials, magnesium-5.66 percent calcium intermediate alloy (Mg-Ca intermediate alloy) with the purity of more than 99.9 percent is used as calcium raw materials, and zinc particles with the purity of more than 99.9 percent are used as zinc raw materials.
In this embodiment, vacuum melting is performed in a vacuum melting furnace, and the specific steps include: vacuumizing a vacuum melting furnace, filling argon for protection, wherein the vacuum degree in the melting chamber after vacuumizing is 0.0007Pa, the pressure of vacuum melting is-0.02 Pa, and the temperature of vacuum melting is 720 ℃.
In this embodiment, the temperature of the homogenization heat treatment is preferably 330 ℃ and the holding time is 24 h. In this embodiment, the homogenization heat treatment is preferably performed in a box furnace.
In this example, magnesium alloy ingots were obtained by sequentially subjecting the above raw materials to vacuum melting and homogenization heat treatment. ICP-AES is used for analyzing the alloy components of the magnesium alloy ingot, and the calcium content is 1 percent, the zinc content is 3 percent, the impurity element content is not more than 0.01 percent, and the rest is magnesium element.
After the cast ingot is obtained, sequentially removing surface defects and then performing a hot extrusion process, wherein the extrusion equipment in the embodiment is a 600-ton vertical hydraulic press, the extrusion pressure is 12MPa, and the extrusion speed is 0.8 mm/s; the preheating temperature of the extrusion die is preferably 200 ℃.
In the embodiment, the magnesium alloy ingot is preheated before being extruded, the preheating temperature is 300 ℃, and the preheating time is 2 hours. The extrusion temperature is 280 ℃, the extrusion ratio is 10, the thickness of the magnesium alloy plate obtained after extrusion is 6mm, and the grain diameter is less than or equal to 15 mu m.
Carrying out multi-pass rolling and annealing on the obtained magnesium alloy extruded plate to obtain a plate with a thinner thickness; and (3) peeling the rough plate obtained by extrusion before rolling, and removing surface defects.
The hot rolling process is adopted in the embodiment, the rolling temperature is 350 ℃, the heat preservation time is 30min before the rolling is started, the pass processing rate is 10%, when the accumulated deformation is 30%, the inter-pass annealing is carried out, the annealing temperature is 250 ℃, and the heat preservation time is not less than 10 min. The rolling process was then repeated until the plate was 3.5mm behind.
The mechanical properties of the magnesium-zinc-calcium board obtained in the embodiment are measured as follows: the yield strength is more than 150MPa, the tensile strength is more than 180MPa, and the elongation is more than 5 percent. The grain diameter is less than or equal to 10 mu m;
the magnesium-zinc-calcium alloy plate obtained in the processing procedures is processed into the structure of the first embodiment of the magnesium alloy patella claw in the figures 1 to 4 through a numerical control milling machine, a linear cutting process and a die bending process.
The magnesium alloy material prepared in the embodiment also meets the requirements of clinical use on degradation uniformity and degradation rate. Experiments have shown that the corrosion rate in Hank's simulated body fluid is 1 mm/year. The loss of mechanical property in three months is not more than 30 percent, and the degradation is more uniform.
Second embodiment of the preparation method:
the raw material proportion is also carried out according to the following alloy raw materials, namely, a magnesium ingot with the purity of more than 99.9 percent is used as a magnesium raw material, a magnesium-5.66 percent calcium intermediate alloy (Mg-Ca intermediate alloy) with the purity of more than 99.9 percent is used as a calcium raw material, and zinc particles with the purity of more than 99.9 percent are used as a zinc raw material.
In this embodiment, vacuum melting is performed in a vacuum melting furnace, and the specific steps include: vacuumizing the vacuum smelting furnace and then filling argon for protection. The vacuum degree in the vacuum-pumped smelting chamber is 0.001Pa, the pressure of the vacuum smelting is-0.03 Pa, and the temperature of the vacuum smelting is 750 ℃.
In this embodiment, the temperature of the homogenization heat treatment is preferably 400 ℃ and the holding time is 20 h. In this embodiment, the homogenization heat treatment is preferably performed in a box furnace.
In this example, magnesium alloy ingots were obtained by sequentially subjecting the above raw materials to vacuum melting and homogenization heat treatment. ICP-AES is used for analyzing the alloy components of the magnesium alloy ingot, and the calcium content is 0.5 percent, the zinc content is 2 percent, the impurity element content is not more than 0.01 percent, and the balance is magnesium element.
After the cast ingot is obtained, the hot extrusion process is carried out after surface defects are removed in sequence, the extrusion equipment of the embodiment is a 600-ton vertical hydraulic press, the extrusion pressure is 14MPa, and the extrusion speed is 1.2 mm/s; the preheating temperature of the extrusion die is preferably 240 ℃.
In the embodiment, the ingot is preheated before being extruded, the preheating temperature is 350 ℃, and the preheating time is 2.5 hours. The extrusion temperature is 320 ℃, the extrusion ratio is 20, the thickness of the extruded sheet obtained after extrusion is 6mm, and the grain diameter is less than or equal to 10 mu m.
Carrying out multi-pass rolling and annealing on the obtained extruded plate to obtain a plate with a thinner thickness; and (3) peeling the rough plate obtained by extrusion before rolling, and removing surface defects.
The hot rolling process is adopted in the embodiment, the rolling temperature is 400 ℃, the heat preservation time is 30min before the rolling is started, the pass processing rate is 15%, when the accumulated deformation is 30%, the inter-pass annealing is carried out, the annealing temperature is 280 ℃, and the heat preservation time is not less than 10 min. The rolling process was then repeated until the plate was 3mm behind.
The mechanical properties of the extruded sheet obtained in this example were measured as follows: the yield strength is more than 180MPa, the tensile strength is more than 220MPa, and the elongation is more than 10 percent. The grain diameter is less than or equal to 8 mu m.
The magnesium-zinc-calcium alloy plate obtained in the processing procedures is processed into the structure of the first embodiment of the magnesium alloy patella claw in the figures 1 to 4 through a numerical control milling machine, a linear cutting process and a die bending process.
The magnesium alloy material prepared in the embodiment also meets the clinical use requirements in degradation uniformity and degradation rate, and experiments show that the corrosion rate in Hank's simulated body fluid is 1.2 mm/year. The loss of mechanical property in three months is not more than 35 percent, and the degradation is more uniform.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (14)
1. A degradable magnesium alloy patellar claw, comprising:
the magnesium alloy patella claw is prepared from degradable and absorbable magnesium or magnesium alloy, and comprises
The first claw piece comprises a bearing part and more than one bone claw which is connected with one side of the bearing part and forms a bending shape, wherein the bearing part is provided with an elastic spring sheet, a track, a limiting part arranged on the spring sheet and an adjusting piece which is linked with the limiting part, the adjusting piece is in a cam shape and is arranged above the spring sheet, a slot is formed on the top surface for inserting and adjusting a tool, and the spring sheet can be compressed or loosened by rotating the adjusting piece;
the second claw piece is matched with the first claw piece in shape and size, can be correspondingly installed and slide in the track of the first claw piece, and comprises a sliding part and more than one bone claw arranged on one side of the sliding part, the second claw piece is movably and correspondingly arranged in the track of the first claw piece through the sliding part, a limiting area is arranged on the sliding part, the limiting area and the limiting part are in inverted tooth shapes, and the first claw piece and the second claw piece can be selectively and correspondingly clamped in the limiting area of the second claw piece through adjusting the adjusting piece by the limiting part of the elastic piece.
2. The degradable magnesium alloy patella claw according to claim 1, wherein the magnesium alloy patella claw is made of magnesium or magnesium alloy with the total mass of 100%, the content of magnesium is 94-99%, the content of calcium is 0.1-3%, the content of zinc is 0.1-3%, and the sum of the contents of other impurities is not more than 0.01%.
3. The degradable magnesium alloy patellar claw according to claim 2, wherein the magnesium or magnesium alloy comprises any one of pure magnesium, magnesium-zinc-based alloy, magnesium-calcium-based alloy, magnesium-lithium-based alloy, magnesium-strontium-based alloy, magnesium-manganese-based alloy, magnesium-neodymium-based alloy, magnesium-yttrium-based alloy, and magnesium-gadolinium-based alloy.
4. The degradable magnesium alloy patellar claw according to claim 3, wherein the magnesium-zinc alloy is a magnesium-zinc-calcium alloy or a magnesium-zinc-lithium alloy, the magnesium-calcium alloy is a magnesium-zinc-calcium alloy or a magnesium-calcium-strontium alloy, the magnesium-lithium alloy is a magnesium-zinc-lithium alloy, the magnesium-strontium alloy is a magnesium-calcium-strontium alloy, and the magnesium-manganese alloy is a magnesium-zinc-manganese alloy.
5. The degradable magnesium alloy patella claw according to any of claims 1 to 4, wherein one end of the spring plate is a substantially circular base, and a stop portion and the limiting portion horizontally extend from the base at the other end, respectively, and a gap is formed between the stop portion and the limiting portion to enable one side of the spring plate to generate elasticity.
6. The degradable magnesium alloy patellar claw according to claim 5, wherein the first claw member has a positioning portion protruding from the bearing portion adjacent to the bone claw, the sliding portion of the second claw member has an opening corresponding to the positioning portion, and the positioning portion is formed on the sliding portion.
7. A method of making the degradable magnesium alloy patellar claw of any of claims 1-6, comprising:
a step of ingot forming, which is to sequentially carry out vacuum melting on the degradable magnesium or the magnesium alloy to obtain an ingot;
a plate forming step, namely sequentially removing the surface defects of the cast ingots obtained in the previous step and extruding the cast ingots into plates;
rolling and forming, namely rolling and annealing the plate obtained in the previous step for multiple times to obtain a plate raw material with required thickness;
forming the patella claw, namely obtaining the shape contour structural component of the patella claw by using a numerical control milling machine, a linear cutting or laser cutting and stamping mode for the rolled plate;
and a post-treatment step, namely placing the bone claw of the patella claw prepared in the previous step into a directional annealing device for local instantaneous heating treatment, so that the hardness value of a bone claw material is lower than that of an original plate material after the directional annealing treatment, thereby enabling the bone claw to be conveniently shaped when in use and bent into a required angle according to the peripheral shape of the patella.
8. The preparation method of claim 7, wherein in the step of forming the ingot, the vacuum melting furnace is vacuumized and then filled with argon for protection, the pressure of vacuum melting is-0.02 to-0.03 Pa, the vacuum degree in the melting chamber after vacuumizing is 0.001 to 0.0001Pa, and the temperature of vacuum melting is 650 to 750 ℃.
9. The preparation method of claim 7, wherein in the step of forming the ingot, the ingot further comprises a homogenization heat treatment process, the heating temperature is 350-450 ℃, and the holding time is 12-30 hours.
10. The production method according to claim 7, wherein in the sheet forming step, the ingot is extruded at an extrusion pressure of 10 to 15MPa, the extrusion speed is 0.2 to 2mm/s, and the preheating temperature of the extrusion die is 200 to 250 ℃.
11. The preparation method according to claim 7, wherein in the step of forming the plate, the ingot is preheated before extrusion, the preheating temperature is 300-450 ℃, the preheating time is 2-3 h, the extrusion temperature is 150-350 ℃, the extrusion ratio is 10-100, and the grain diameter of the extruded plate is less than or equal to 15 μm.
12. The preparation method of the steel plate as claimed in claim 7, wherein in the step of rolling and forming, the rolling temperature of the rolling method of the plate is 350-450 ℃, the temperature is kept for 30min before rolling, the pass processing rate is 10-30%, the pass intermediate annealing temperature is 150-350 ℃, the temperature keeping time is not less than 10min, the thickness of the plate after rolling is 0.2-3.5 mm, the mechanical properties of the plate after rolling are yield strength of more than 130MPa, tensile strength of more than 160MPa and elongation of more than 5%, and the grain size of the plate after rolling is 2-10 μm.
13. The preparation method of claim 7, wherein the annealing process in the post-treatment step adopts an annealing temperature of 250-350 ℃ and a heat preservation time of 0.5-2 h, and the hardness of the annealed patellar claw is not higher than Hv 50.
14. The method for preparing the patellar claw according to claim 13, wherein an electrolytic polishing process is further included in the post-processing step to remove surface oxides and impurities of the patellar claw.
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| CN114769350A (en) * | 2022-04-22 | 2022-07-22 | 王韬 | Multi-angle magnesium alloy locking bone fracture plate for calcaneal tuberosity fracture and preparation method thereof |
| CN118000877A (en) * | 2023-08-08 | 2024-05-10 | 苏州奥芮济医疗科技有限公司 | Degradable bone screw for promoting fracture surface healing and preparation method thereof |
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