CN211325893U - Porous tantalum support rod - Google Patents
Porous tantalum support rod Download PDFInfo
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- CN211325893U CN211325893U CN201921130969.5U CN201921130969U CN211325893U CN 211325893 U CN211325893 U CN 211325893U CN 201921130969 U CN201921130969 U CN 201921130969U CN 211325893 U CN211325893 U CN 211325893U
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Abstract
The utility model provides a porous tantalum support rod belongs to medical instrument technical field. The utility model provides a porous tantalum support rod, which comprises a cylindrical main body part, wherein the tail part of the main body part is provided with a thread structure, and the end surface of the top end of the main body part is an inclined spherical surface; an axial through hole is formed in the main body part; the axial through hole is expanded into a spherical cavity at a predetermined position, wherein the distance between the spherical cavity and the eccentric surface is equal to the diameter of the spherical cavity. The utility model provides a porous tantalum support stick has higher mechanical properties and better biocompatibility, is favorable to the adhesion and the hyperplasia of cell, makes living body bone and porous tantalum support stick firmly combine together, promotes bone tissue restoration.
Description
Technical Field
The utility model relates to the technical field of medical equipment, concretely relates to porous tantalum support stick.
Background
Femoral head necrosis is a common clinical disease, and currently, a porous medical metal implant material is usually adopted to fill the femoral head necrosis part. The tantalum metal has good biocompatibility, the human body is not easy to generate rejection reaction, and the elastic modulus of the tantalum metal is close to that of bone tissues, so that bone cells can be promoted to grow into pores of the tantalum metal rod quickly. However, the supporting effect of the porous tantalum rod in the prior art is not good enough, and the combination effect with the bone tissue still needs to be improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a porous tantalum supports stick, the utility model provides a porous tantalum supports stick has higher mechanical properties and better biocompatibility, is favorable to adhering and the hyperplasia of cell, makes the live body bone firmly combine together with the artificial limb, promotes bone tissue repair.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
the utility model provides a porous tantalum support rod, which comprises a cylindrical main body part, wherein the tail part of the main body part is provided with a thread structure 3, and the end surface of the top end of the main body part is an inclined spherical surface;
an axial through hole 2 is arranged in the main body part; the axial through hole 2 is enlarged at a predetermined position to form a spherical cavity 1, wherein the distance between the spherical cavity 1 and the spherical surface is equal to the diameter of the spherical cavity 1.
Preferably, the diameter of the spherical cavity 1 is equal to the radius of the body portion.
Preferably, the diameter of the axial through hole 2 is 3-5 mm, and the diameter of the spherical inner cavity 1 is 5-8 mm.
Preferably, the main body part is of a porous structure, the average porosity is 70-75%, the average pore diameter is 0.5-0.8 mm, and the average pore ribs are 0.25-0.3 mm;
a hole is formed in the threaded structure 3, and the aperture of the hole is 5-8 mm.
Preferably, the length of the tail part is 1/5-1/3 of the total length of the main body part.
Preferably, the tail end of the tail part is symmetrically provided with a first clamping groove 4-1 and a second clamping groove 4-2, the length of the first clamping groove 4-1 and the length of the second clamping groove 4-2 are 8-10 mm, and the width of the first clamping groove 4-1 and the width of the second clamping groove 4-2 are 4-5 mm.
Preferably, the area between the bottom surfaces of the first clamping groove 4-1 and the second clamping groove 4-2 is a clamping area, and the thickness of the clamping area is 5-8 mm; the clamping area is provided with a three-dimensional through cylindrical hole 6, and the aperture of the three-dimensional through cylindrical hole 6 is 0.5-0.8 mm.
Preferably, an implantation angle mark 5 is arranged on the end face of the tail end of the clamping area, and the implantation angle mark 5 is an inner concave equilateral triangle.
The utility model provides a porous tantalum support rod, which comprises a cylindrical main body part, wherein the tail part of the main body part is provided with a thread structure 3, and the end surface of the top end of the main body part is an inclined spherical surface; an axial through hole 2 is arranged in the main body part; the axial through hole 2 is enlarged at a predetermined position to form a spherical cavity 1, wherein the distance between the spherical cavity 1 and the spherical surface is equal to the diameter of the spherical cavity 1. The end surface of the top end of the porous tantalum support rod provided by the utility model is a spherical surface, which is in surface contact with the affected part, thereby playing a better support effect; the inner part is provided with an axial through hole 2 which is beneficial to the decompression of the medulla of the femur and can be used as a functional channel; the spherical inner cavity 1 can enable filled broken bones to be more compact, and is favorable for combination of the porous tantalum support rod and bone tissues. The utility model provides a porous tantalum support stick has higher mechanical properties and better biocompatibility, is favorable to the adhesion and the hyperplasia of cell, makes living body bone and porous tantalum support stick firmly combine together, promotes bone tissue restoration. According to the detection result of the embodiment, the utility model provides a porous tantalum support stick's compressive strength is 150 ~ 180MPa, and the elastic modulus is up to 3 ~ 15GPa, has better supporting effect.
Drawings
Fig. 1 is a schematic plan view of a porous tantalum support rod prepared according to the present invention;
fig. 2 is a schematic diagram of a three-dimensional structure of a porous tantalum support rod prepared by the present invention;
FIG. 3 is a longitudinal cross-sectional view of FIG. 2;
FIG. 4 is a cross-sectional left side view (A-A) of FIG. 2;
FIG. 5 is a cross-sectional left side view (B-B) of FIG. 2;
FIG. 6 is a cross-sectional left side view (C-C) of FIG. 2;
fig. 7 is a schematic end view of the clamping area end of the porous tantalum support rod prepared by the present invention;
wherein, 1 is a spherical inner cavity, 2 is an axial through hole, 3 is a thread structure, 4-1 is a first clamping groove, 4-2 is a second clamping groove, 4-11 is the bottom surface of the first clamping groove 4-1, 4-22 is the bottom surface of the second clamping groove 4-2, 5 is an implantation angle mark, and 6 is a three-dimensional through cylindrical hole.
Detailed Description
The utility model provides a porous tantalum support rod, which comprises a cylindrical main body part, wherein the tail part of the main body part is provided with a thread structure 3, and the end surface of the top end of the main body part is an inclined spherical surface; an axial through hole 2 is arranged in the main body part; the axial through hole 2 is enlarged at a predetermined position to form a spherical cavity 1, wherein the distance between the spherical cavity 1 and the spherical surface is equal to the diameter of the spherical cavity 1.
The utility model discloses it is right the concrete size of spherical surface does not have special requirement, and the face radian is unanimous with the affected part can. In the present invention, the main body portion is cylindrical, and the present invention is not limited to the specific size of the main body portion, and is generally determined according to the CT scan data of the patient, so as to embody highly accurate customized medical treatment, in the specific embodiment of the present invention, the diameter of the main body portion is preferably 10 mm.
The utility model discloses in, porous tantalum supports stick has porous structure, the utility model discloses it is right porous structure does not have special requirement, confirms according to the required support intensity in affected part usually. In the embodiment of the utility model, the average porosity of main part is preferably 70 ~ 75%, and average pore diameter is preferably 0.5 ~ 0.8mm, and average pore muscle is preferably 0.25 ~ 0.3 mm. The utility model discloses a support stick that has above-mentioned porous structure is favorable to improving the porosity, reduces weight, and mechanical properties is more close the people's bone to effectively reduce stress shielding effect, porous structure is favorable to bone tissue to grow into in the support stick moreover. In a specific embodiment of the invention, when the porous tantalum support rod is used for a bionic bone trabecula structure, the porous tantalum support rod is of a bionic disordered structure, the average porosity of the main body part is 70%, the average pore ribs are 0.3mm, and the average pore diameter is 0.5 mm; when the porous tantalum support rod is used for a multistage rhombic dodecahedron structure, the porous tantalum support rod is of a regular porous structure, and the regular porous structure specifically comprises: the aperture of the top of the main body part (a section of the main body part which is 5mm away from the spherical surface at the top end) is 0.8mm, the pore ribs are 0.3mm, and the porosity is 75%; the aperture of the middle section of the main body part is 0.5mm, the pore ribs are 0.3mm, and the porosity is 65%; the tail aperture of the main body part is 0.3mm, the hole ribs are 0.3mm, and the porosity is 60%.
The utility model discloses in, the inside of main part is provided with axial perforating hole 2, is favorable to the intramedullary decompression in the thighbone to can regard as functional passageway, add some drug reagent (like factors such as bone morphogenetic protein) that are favorable to the patient to resume from this passageway according to the operation demand, also can fill patient self broken bone through this passageway. The utility model discloses in, axial perforating hole 2 enlarges to spherical inner chamber 1 in predetermined position, wherein, distance between spherical inner chamber 1 and the spherical surface partially equals spherical inner chamber 1's diameter, distance between spherical inner chamber 1 and the spherical surface partially is spherical inner chamber 1's centre of sphere and spherical surface partially's perpendicular distance. The utility model discloses a set up spherical inner chamber 1, can make the broken bone of filling in compacter, be favorable to porous tantalum to support the combination of stick and osseous tissue. In the present invention, the diameter of the axial through hole 2 is preferably 3 to 5mm, and more preferably 3 mm; the diameter of the spherical inner cavity 1 is preferably 5-8 mm, and more preferably 5 mm.
The utility model discloses in, the afterbody of main part is provided with helicitic texture 3, preferably from the locking thread, can stabilize the support stick, prevents that the postoperative from appearing moving back the nail. In the present invention, the length of the tail is preferably 1/5 ~ 1/3, more preferably 1/4 of the total length of the main body. In a specific embodiment of the present invention, the length of the main body portion is preferably 93mm, and the length of the tail portion is preferably 24 mm.
In the utility model discloses, the external diameter of helicitic texture 3 is preferably 12 ~ 14mm, more preferably 14 mm; the inner diameter is preferably 8-10 mm, and more preferably 10 mm; the preferred intermediate diameter is 10-12 mm, and the more preferred intermediate diameter is 12 mm; the thread pitch of the thread structure 3 is preferably 2-4 mm, and more preferably 4 mm; the number of lines is preferably 1-2, and more preferably 1; the lead of the thread structure 3 is preferably 4-8 mm, and more preferably 8 mm; the lift angle is preferably 2.5-5 °, more preferably 5 °; the thread form angle of the thread structure 3 is preferably trapezoidal; holes are preferably formed in the threaded structure 3, and the aperture of each hole is preferably 5-8 mm, and more preferably 8 mm; the distance between adjacent holes is preferably 0.2-0.4 mm, and more preferably 0.3 mm. The utility model discloses a be provided with the effect of the helicitic texture 3 in hole and be the increase porosity, reduce the weight of porous tantalum support stick, increase porous tantalum support stick coefficient of surface friction, be favorable to the growing into and the combination of bone tissue.
As an embodiment of the present invention, the tip of the tail portion is symmetrically provided with a first clamping groove 4-1 and a second clamping groove 4-2; the length of the first clamping groove 4-1 and the second clamping groove 4-2 is preferably 8-10 mm, more preferably 10mm, and the width is preferably 4-5 mm, more preferably 5 mm. Wherein, the length refers to the dimension along the axial direction of the porous tantalum support rod, and the width refers to the dimension along the radial direction of the porous tantalum support rod.
As an embodiment of the present invention, the first holding groove 4-1 and the second holding groove 4-2 have the same size. The utility model discloses it is preferred to maintain on the basis of the aforesaid helicitic texture 3, obtains the first centre gripping recess 4-1 and the second centre gripping recess 4-2 that the symmetry set up.
As an embodiment of the present invention, the region between the bottom surfaces of the first holding groove 4-1 and the second holding groove 4-2 is a holding region, and as shown in fig. 7, the region between the bottom surface of the first holding groove 4-11 and the bottom surface of the second holding groove 4-22 is a holding region; the thickness of the clamping area is preferably 5-8 mm, and more preferably 6 mm; the clamping area is provided with a three-dimensional through cylindrical hole 6, and the aperture of the three-dimensional through cylindrical hole 6 is preferably 0.5-0.8 mm, and more preferably 0.8 mm; the distance between the adjacent three-dimensional through cylindrical holes 6 is preferably 0.3-0.5 mm, and more preferably 0.3 mm. The utility model discloses in, the centre gripping recess is favorable to the apparatus centre gripping, the three-dimensional cylinder hole that link up can guarantee that the region between the centre gripping grooved underside has sufficient porosity, has higher intensity simultaneously.
As an embodiment of the present invention, the end surface of the clamping area is preferably provided with an implantation angle mark 5, and more preferably a screwing angle mark; the implantation angle mark 5 is an inward concave equilateral triangle, as shown in fig. 7, one corner of the inward concave equilateral triangle points to the bottom surface 4-11 of the first clamping groove, and the corner pointing to the bottom surface 4-11 of the first clamping groove is an implantation indication direction, which is beneficial to guiding the operation of a doctor so as to ensure that the supporting direction of the spherical surface of the main body part is accurate.
The utility model also provides a preparation method of above-mentioned technical scheme porous tantalum support stick, preferably include following step:
(1) acquiring three-dimensional model data of an affected part area of the femoral head of a patient, and constructing a three-dimensional model of the porous tantalum metal rod;
(2) adding a porous structure to the three-dimensional model obtained in the step (1); an axial through hole 2 is arranged in the three-dimensional model, and the axial through hole 2 is expanded into a spherical cavity 1 at a preset position, wherein the distance between the spherical cavity 1 and an aspheric surface is equal to the diameter of the spherical cavity 1;
(3) taking tantalum or tantalum alloy powder as a raw material, and printing and manufacturing by using a selective laser melting 3D printing technology according to the three-dimensional model obtained in the step (2) to obtain a porous tantalum support rod blank;
(4) and carrying out heat treatment on the porous tantalum support rod blank to obtain the porous tantalum support rod.
The utility model discloses preferentially acquire the regional three-dimensional model data in patient's femoral head affected part earlier, found the three-dimensional model of porous tantalum metal stick. The utility model discloses in, the preferred CT scan data through the patient establishes the three-dimensional model in patient affected part, then according to the three-dimensional model in affected part, founds the porous tantalum support stick appearance model of laminating affected part shape, makes the structure of porous tantalum support stick and the accurate correspondence in affected part.
After a three-dimensional model of the porous tantalum metal rod is constructed, the utility model preferably adds a porous structure into the three-dimensional model; an axial through hole 2 is arranged in the three-dimensional model, and the axial through hole 2 is expanded into a spherical cavity 1 at a preset position, wherein the distance between the spherical cavity 1 and an aspheric surface is equal to the diameter of the spherical cavity 1; and adding a thread structure 3 at the tail part of the three-dimensional model. The utility model discloses it is preferred first centre gripping recess 4-1 and the second centre gripping recess 4-2 that the symmetry set up are added to the afterbody of three-dimensional model to add implantation angle mark 5.
After establishing the three-dimensional model, the utility model discloses preferably use tantalum or tantalum alloy powder as the raw materials, according to the three-dimensional model utilizes selectivity laser melting 3D printing technique to print the manufacturing, obtains porous tantalum support stick base body. In the present invention, the tantalum or tantalum alloy powder is preferably spherical, and the particle size of the tantalum or tantalum alloy powder is preferably 1 to 100 μm, and more preferably 15 to 45 μm; the sphericity is preferably > 60, more preferably > 90. In the present invention, the purity of the tantalum or tantalum alloy powder is preferably > 99.9%.
The utility model discloses it is right the concrete preparation technology of laser melting 3D printing technique does not have special injecing to it is suitable to obtain the porous tantalum support stick body that accords with the size requirement. In the embodiment of the present invention, the porous tantalum support rod blank is preferably manufactured by printing according to the following steps:
and converting the built three-dimensional model into an STL format, introducing the STL format into selective laser melting 3D printing equipment for slicing, selecting a proper substrate and protective gas, setting various printing parameters, and printing to obtain the porous tantalum support rod blank.
In the present invention, the substrate is preferably a titanium alloy substrate; the protective gas is preferably high-purity argon; the printing parameters preferably include the slice layer thickness, substrate temperature, laser power, laser scanning speed, and laser scanning line spacing. In the utility model, the slice layer thickness is preferably 0.02-0.04 mm, and more preferably 0.03 mm; the temperature of the substrate is preferably 60-200 ℃, and more preferably 100-150 ℃; the laser power is preferably more than 100W, more preferably 200-300W, and most preferably 250W; the laser scanning speed is preferably more than 100mm/s, more preferably 100-200 mm/s, and most preferably 150 mm/s; the scan line pitch is preferably <0.1mm, more preferably 0.07 mm. The utility model discloses the porous tantalum support stick body that the printing obtained is preferred to use the base plate as supporting.
Obtain behind the porous tantalum support stick blank, the utility model discloses it is preferred will porous tantalum support stick blank carries out heat treatment, obtains porous tantalum support stick the utility model discloses in, heat treatment is preferred to be carried out under vacuum condition, and vacuum degree is preferred 5 × 10-3～1×10-2Pa, more preferably 5 × 10-3Pa. In the present invention, the heat treatment preferably includes a first-stage heat-insulating heat treatment and a second-stage heat-insulating heat treatment which are performed in this order; the temperature of the first-stage heat preservation heat treatment is preferably 250-300 DEG CMore preferably 300 ℃, and the time is preferably 0.5-1 h, more preferably 0.5 h; the temperature of the second-stage heat preservation heat treatment is preferably 900-1100 ℃, more preferably 1000 ℃, and the time is preferably 2-3 hours, more preferably 2 hours. The utility model discloses rate of rise in heat treatment in-process is preferably 5 ~ 8 ℃/min, and more preferably is 5 ℃/min. In the utility model, after the heat treatment is finished, the porous tantalum support rod is obtained by preferably cooling along with the furnace.
The utility model discloses going on before the heat treatment, preferably will powder in the porous tantalum support stick base body is got rid of, and more preferably adopts explosion-proof dust catcher to suck away residual powder in the porous tantalum support stick base body hole.
The utility model discloses going on during the heat treatment, together carrying out heat treatment with porous tantalum support stick base plate, after the heat treatment, the utility model discloses the preferred porous tantalum support stick base plate after with heat treatment separates out from the base plate, then carries out first washing, acid treatment and second washing in proper order with the porous tantalum support stick base plate after heat treatment, obtains porous tantalum support stick. In an embodiment of the present invention, the heat-treated porous tantalum support rod is preferably separated from the substrate using a wire cutting apparatus.
In the present invention, the first cleaning is preferably performed under ultrasonic conditions, and the first cleaning agent is preferably an ethanol solution with a mass fraction of 95%. The utility model discloses it is right first abluent time does not have special requirement to it is suitable that no tantalum powder shakes out the utility model discloses in, first abluent time is preferred more than 30 min. The utility model discloses a wash for the first time and can get rid of the heat treatment in-process and remain the free tantalum powder in porous tantalum support stick porous structure.
In the utility model discloses, acid solution for the acid treatment is preferably the mixed solution of acetic acid, nitric acid and hydrofluoric acid, the volume ratio of acetic acid, nitric acid and hydrofluoric acid is preferably 10 (3 ~ 4):1, more preferably 10:4: 1. The utility model discloses an acid solution corrodes porous tantalum and supports the stick and can further get rid of the free powder in the porous structure, can also make porous tantalum support stick surface rougher simultaneously, and increase and human tissue friction within a definite time prevent that the landing from moving back the nail.
The utility model discloses in, the second washs preferably to go on under the supersound condition, the second washs preferably to wash respectively for 30min with absolute ethyl alcohol and distilled water in proper order, can further get rid of the remaining impurity in porous tantalum support stick surface to preliminary disinfection.
The utility model adopts the selective laser melting 3D printing technology for one-step forming, and compared with the traditional vapor deposition method, the subsequent complex machining process is avoided, and the preparation process is simpler and more convenient; and the pore structure of the porous tantalum support rod and the position and the size of the axial through hole can be artificially controlled, the matched appearance form is set according to the actual condition of a patient, and a prosthesis structure which is more attached to an affected part and accurate is obtained.
Adopt the utility model provides a porous tantalum support stick can accurately match patient affected part, and the preferred bionic bone trabecula structure or the dodecahedron structure of rhombus that is used for has better supporting effect, and the bone tissue's of being convenient for length is gone into, reaches the prevention or delays the purpose that the femoral head sinks.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
The embodiment is a preparation method of a porous tantalum support rod with a bionic bone trabecular structure, the obtained bionic bone trabecular structure is shown in figure 1, and the preparation method comprises the following steps:
(1) acquiring CT scanning data of a necrotic area of a patient, and constructing a three-dimensional model of the overall appearance of a porous tantalum support rod for accurately supporting the necrotic area;
(2) adding a bionic bone trabecula structure to the built three-dimensional model, wherein the main body part is a cylinder with the length of 93mm and the diameter of 10mm, the end face of one end is a spherical surface which is fitted with the shape of the focus of a patient, the radian of the surface is consistent with that of an affected part, the average pore diameter of the main body part is 0.3mm, the average pore diameter is 0.5mm, and the average porosity is 70%; adding an axial through hole 2 in the main body part, wherein the diameter of the axial through hole 2 is 3mm, the axial through hole 2 is expanded into a spherical cavity 1 at a position 5mm away from an aspheric surface, and the diameter of the spherical cavity 1 is 5 mm;
a tail part with a self-locking thread structure 3 is arranged at one end of the main body part, the outer diameter of the self-locking thread structure 3 is 14mm, the inner diameter of the self-locking thread structure is 10mm, the middle diameter of the self-locking thread structure is 12mm, the thread pitch of the self-locking thread structure is 4mm, the number of threads is 1, the lead of the self-locking thread structure is 8mm, the lead angle of the self-locking thread structure is 5 degrees, and; the aperture of the self-locking thread structure 3 is 0.8 mm; the length of the tail part is 24 mm;
trimming is carried out on the basis of the self-locking thread structure 3 to obtain a first clamping groove 4-1 and a second clamping groove 4-2 which are symmetrically arranged, wherein the length of each of the first clamping groove 4-1 and the second clamping groove 4-2 is 10mm, and the width of each of the first clamping groove 4-1 and the second clamping groove 4-2 is 5 mm; as shown in fig. 7, the area between the bottom surface 4-11 of the first clamping groove and the bottom surface 4-22 of the second clamping groove is a clamping area, the thickness of the clamping area is 6mm, the clamping area is provided with a three-dimensional through cylindrical hole 6, and the aperture is 0.8 mm;
arranging an implantation angle mark 5 on the end face of the tail end of the clamping area, wherein the implantation angle mark 5 is an inward concave equilateral triangle, and an angle pointing to the bottom surface 4-11 of the first clamping groove is an implantation indication direction;
(3) selecting spherical tantalum metal powder, and printing and manufacturing by adopting a selective laser melting 3D printing technology to obtain a porous tantalum support rod blank; the particle size of the spherical tantalum metal powder is 15-45 mu m; sphericity > 90; purity > 99.9%; converting the built three-dimensional model into an STL format, introducing the STL format into selective laser melting 3D printing equipment for slicing, selecting a proper substrate and protective gas, setting various printing parameters, and printing to obtain the porous tantalum support rod blank; wherein the substrate is a titanium alloy substrate; the protective gas is high-purity argon; the printing parameters mainly comprise the thickness of a slice layer, the temperature of a substrate, laser power, laser scanning speed and laser scanning line spacing; the thickness of the slicing layer is 0.03 mm; the temperature of the substrate is 100 ℃; the laser power is 250W; the laser scanning speed is 150 mm/s; the distance between the scanning lines is 0.07 mm;
(4) after obtaining the porous tantalum support rod blank, using an explosion-proof dust collector to suck residual powder in pores of the porous tantalum support rod blank as much as possible, putting the porous tantalum support rod blank and the substrate into a high vacuum annealing furnace for heat treatment, wherein the vacuum degree is 5 x 10-3Pa, the whole temperature rise rate is 5 ℃/min, the temperature is kept at 300 ℃ for 0.5h, the temperature is kept at 1000 ℃ for 2h, and the temperature is cooled along with the furnace so as to eliminate residual stress; then cutting off the porous tantalum support rod after heat treatment, and removing redundant support; ultrasonic cleaning in 95% ethanol solution for more than 30min until no tantalum powder is shaken out, and then further removing free powder by acid solution corrosion; finally, respectively ultrasonically cleaning the porous tantalum support rod by absolute ethyl alcohol and distilled water for 30min to obtain a porous tantalum support rod; wherein the acid solution is a mixed solution of acetic acid, nitric acid and hydrofluoric acid according to a volume ratio of 10:4: 1; the schematic plane structure diagram of the porous tantalum support rod is shown in figure 1, the schematic three-dimensional structure diagram is shown in figure 2, the longitudinal section view is shown in figure 3, the left side view of the cross section A-A in figure 2 is shown in figure 4, the left side view of the cross section B-B in figure 2 is shown in figure 5, and the left side view of the cross section C-C in figure 2 is shown in figure 6.
The mechanical property of the porous tantalum support rod obtained by testing according to the method of GB/T1964-1996 is that the compressive strength is 180MPa and the elastic modulus is 10 GPa; the porosity of the porous tantalum support rod measured according to the method of GB/T5163-2006 is 70%.
Example 2
The embodiment is a method for preparing a porous tantalum support rod with a multi-stage rhombic dodecahedron structure, wherein the method for preparing the porous tantalum rod with the multi-stage rhombic dodecahedron structure is as follows:
(1) acquiring CT scanning data of a necrotic area of a patient, and constructing a three-dimensional model of the overall appearance of a porous tantalum support rod for accurately supporting the necrotic area;
(2) adding a multi-stage rhombic dodecahedron structure to the built three-dimensional model, wherein the main body part is a cylinder with the length of 93mm and the diameter of 10mm, the end face of one end is an aspheric surface which is attached to the shape of a focus of a patient, the radian of the surface is consistent with that of an affected part, the aperture of one main body part which is 5mm away from the aspheric surface is 0.8mm, the pore ribs are 0.3mm, and the porosity is 75%; the length of the middle section of the main body part is 64mm, the aperture is 0.5mm, the hole ribs are 0.3mm, and the porosity is 65%; adding an axial through hole in the main body part, wherein the diameter of the axial through hole is 3mm, the axial through hole is expanded into a spherical inner cavity at a position 5mm away from an aspheric surface, and the diameter of the spherical inner cavity is 5 mm;
a tail part with a self-locking thread structure is arranged at one end of the main body part, the length of the tail part is 24mm, the aperture is 0.3mm, the hole ribs are 0.3mm, and the porosity is 60%; the outer diameter of the self-locking thread structure is 14mm, the inner diameter of the self-locking thread structure is 10mm, the intermediate diameter of the self-locking thread structure is 12mm, the thread pitch of the self-locking thread structure is 4mm, the number of threads is 1, the lead of the self-locking thread structure is 8mm, the lead angle of the self-locking thread structure is 5 degrees, and the thread form angle of the self; the aperture of the thread structure is 0.8 mm;
trimming is carried out on the basis of the self-locking thread structure to obtain a first clamping groove and a second clamping groove which are symmetrically arranged, wherein the length of the first clamping groove and the width of the second clamping groove are both 10mm, and the width of the first clamping groove and the width of the second clamping groove are both 5 mm; the area between the bottom surface of the first clamping groove and the bottom surface of the second clamping groove is a clamping area, the thickness of the clamping area is 6mm, and the clamping area is provided with a three-dimensional through cylindrical hole with the aperture of 0.8 mm;
an implantation angle mark is arranged on the end face of the tail end, the implantation angle mark is designed into an inner concave equilateral triangle, and an angle pointing to the bottom surface of the clamping groove is an implantation indication direction;
(3) selecting spherical tantalum metal powder, and printing and manufacturing by adopting a selective laser melting 3D printing technology to obtain a porous tantalum support rod blank; the particle size of the spherical tantalum metal powder is 15-45 mu m; sphericity > 90; purity > 99.9%; converting the built three-dimensional model into an STL format, introducing the STL format into selective laser melting 3D printing equipment for slicing, selecting a proper substrate and protective gas, setting various printing parameters, and printing to obtain the porous tantalum support rod blank; wherein the substrate is a titanium alloy substrate; the protective gas is high-purity argon; the printing parameters mainly comprise the thickness of a slice layer, the temperature of a substrate, laser power, laser scanning speed and laser scanning line spacing; the thickness of the slicing layer is 0.03 mm; the temperature of the substrate is 100 ℃; the laser power is 250W; the laser scanning speed is 150 mm/s; the distance between the scanning lines is 0.07 mm;
(4) after obtaining the porous tantalum support rod blank, using an explosion-proof dust collector to suck residual powder in pores of the porous tantalum support rod blank as much as possible, putting the porous tantalum support rod blank and the substrate into a high vacuum annealing furnace for heat treatment, wherein the vacuum degree is 5 x 10-3Pa, the whole temperature rise rate is 5 ℃/min, the temperature is kept at 300 ℃ for 0.5h, the temperature is kept at 1000 ℃ for 2h, and the temperature is cooled along with the furnace so as to eliminate residual stress; then cutting off the porous tantalum support rod after heat treatment, and removing redundant support; ultrasonic cleaning in 95% ethanol solution for more than 30min until no tantalum powder is shaken out, and then further removing free powder by acid solution corrosion; finally, respectively ultrasonically cleaning the porous tantalum support rod by absolute ethyl alcohol and distilled water for 30min to obtain a porous tantalum support rod; wherein the acid solution is a mixed solution of acetic acid, nitric acid and hydrofluoric acid according to the volume ratio of 10:4: 1.
The mechanical property of the obtained porous tantalum support rod is tested according to the method of GB/T1964-1996, the compressive strength is 186MPa, and the elastic modulus is 15 GPa; the porosity of the porous tantalum support rod measured according to the method of GB/T5163-2006 is 65%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The porous tantalum support rod is characterized by comprising a cylindrical main body part, wherein the tail part of the main body part is provided with a thread structure (3), and the end surface of the top end of the main body part is an aspheric surface;
an axial through hole (2) is arranged in the main body part; the axial through-hole (2) is enlarged at a predetermined position into a spherical cavity (1), wherein the distance between the spherical cavity (1) and the spherical surface is equal to the diameter of the spherical cavity (1).
2. The porous tantalum support rod of claim 1 wherein the diameter of the spherical cavity (1) is equal to the radius of the body portion.
3. The porous tantalum support rod according to claim 2, wherein the diameter of the axial through hole (2) is 3-5 mm, and the diameter of the spherical inner cavity (1) is 5-8 mm.
4. The porous tantalum support rod of claim 1, wherein the main body part is porous, has an average porosity of 70-75%, an average pore diameter of 0.5-0.8 mm, and an average pore rib of 0.25-0.3 mm;
a hole is formed in the threaded structure (3), and the aperture of the hole is 5-8 mm.
5. The porous tantalum support rod of claim 1, wherein the tail portion has a length of 1/5-1/3 of the total length of the body portion.
6. The porous tantalum support rod according to claim 5, wherein a first clamping groove (4-1) and a second clamping groove (4-2) are symmetrically arranged at the tail end of the tail part, the length of the first clamping groove (4-1) and the width of the second clamping groove (4-2) are 8-10 mm, and the width of the first clamping groove (4-1) and the width of the second clamping groove (4-2) are 4-5 mm.
7. The porous tantalum support rod according to claim 6, wherein the area between the bottom surfaces of the first holding groove (4-1) and the second holding groove (4-2) is a holding area, and the thickness of the holding area is 5-8 mm; the clamping area is provided with a three-dimensional through cylindrical hole (6), and the aperture of the three-dimensional through cylindrical hole (6) is 0.5-0.8 mm.
8. The porous tantalum support rod of claim 7, wherein the end face of the clamping area is provided with an implantation angle mark (5), and the implantation angle mark (5) is a concave equilateral triangle.
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| CN201921130969.5U CN211325893U (en) | 2019-07-18 | 2019-07-18 | Porous tantalum support rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921130969.5U CN211325893U (en) | 2019-07-18 | 2019-07-18 | Porous tantalum support rod |
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| CN211325893U true CN211325893U (en) | 2020-08-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309642A (en) * | 2020-09-29 | 2022-04-12 | 中国航发商用航空发动机有限责任公司 | Method for additive manufacturing of an aircraft engine component and readable storage medium |
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2019
- 2019-07-18 CN CN201921130969.5U patent/CN211325893U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309642A (en) * | 2020-09-29 | 2022-04-12 | 中国航发商用航空发动机有限责任公司 | Method for additive manufacturing of an aircraft engine component and readable storage medium |
| CN114309642B (en) * | 2020-09-29 | 2024-01-12 | 中国航发商用航空发动机有限责任公司 | Additive manufacturing method of aeroengine component and readable storage medium |
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Address after: 071000 101, building 21, Liandong u Valley, No. 64, jingsannan street, economic development zone, Mancheng District, Baoding City, Hebei Province Patentee after: Hebei Dazhou Medical Technology Co.,Ltd. Address before: 071000 Room 202, building 8, University Science and Technology Park, 5699 north two ring road, Baoding, Hebei. Patentee before: HEBEI DAZHOU SMART MANUFACTURING TECHNOLOGY Co.,Ltd. |
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