CN113069247A - Novel lunar prosthesis and design and preparation method thereof - Google Patents
Novel lunar prosthesis and design and preparation method thereof Download PDFInfo
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- CN113069247A CN113069247A CN202110289981.6A CN202110289981A CN113069247A CN 113069247 A CN113069247 A CN 113069247A CN 202110289981 A CN202110289981 A CN 202110289981A CN 113069247 A CN113069247 A CN 113069247A
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- 238000002360 preparation method Methods 0.000 title abstract description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000001746 injection moulding Methods 0.000 claims abstract description 14
- 238000010146 3D printing Methods 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 8
- 210000000988 bone and bone Anatomy 0.000 claims description 56
- 238000004519 manufacturing process Methods 0.000 claims description 15
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- 229910001069 Ti alloy Inorganic materials 0.000 description 1
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Images
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
- A61F2/30—Joints
- A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
- A61F2/4261—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for wrists
-
- 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
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
-
- 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
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
- A61F2002/30948—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using computerized tomography, i.e. CT scans
-
- 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
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2002/30985—Designing or manufacturing processes using three dimensional printing [3DP]
-
- 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
- A61F2/30—Joints
- A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
- A61F2/4261—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for wrists
- A61F2002/4271—Carpal bones
- A61F2002/4287—Proximal carpal row, i.e. bones adjacent the radius and the ulna
- A61F2002/4292—Lunate
Abstract
The invention discloses a novel lunar prosthesis and a design and preparation method thereof, which comprehensively considers the process constraints of a 3D printing forming technology and an injection molding forming technology, enables a lunar to have a moon (a lunar concave surface) and a moon joint (a lunar convex surface) through a mold design method based on a lunar geometrical structure, and carries out targeted selection of a 3D forming reference surface and design of a mold parting surface on a lunar mold prepared by 3D forming, wherein the mold comprises an upper layer mold and a lower layer mold, an upper pouring gate is manufactured on the upper layer mold, a lower pouring gate is manufactured on the lower layer mold, and the lower layer mold is provided with the parting surface, so that the injection molding quality of the lunar prosthesis is ensured and the lunar prosthesis is convenient to take out.
Description
Technical Field
The invention relates to the field of medicine, in particular to a novel lunar prosthesis and a design and preparation method thereof.
Background
At present, the fracture of the lunar bone is a common fracture type in clinic, and the incidence rate is high. Often because direct violence, indirect violence and mixed violence cause, mainly make after the fracture extend knee activity receive showing influence, should restore the level and smooth of articular surface as far as possible after the lunar fracture, because the lunar bone forms the patellofemoral joint with the place ahead of the external condyle in the thighbone, can reduce traumatic patellofemoral arthritis's emergence like this, prevents knee joint flexion contracture etc.. If not properly treated, complications such as fracture nonunion, arthritic adhesions, traumatic arthritis, bone infection, etc. may result. The surgical treatment is suitable for II-type and III-type lunar fractures, the II-type fractures affect the joint surface of the lunar, and the risk of traumatic arthritis is great in the future, so that attention needs to be paid to the flatness of the lunar joint surface. Compared with the operation modes of steel wire and titanium Cable cerclage internal fixation, tension belt internal fixation, nickel titanium patella concentrator internal fixation, Cable-Pin internal fixation system, lunar bone reduction fixator, lunar bone external fixation and arthroscope combination and the like, the lunar bone prosthesis replacement method is adopted, and the mechanical characteristics of the lunar bone can be effectively ensured.
The lunate bone has an important functional role in the wrist joint. The lunar metacarpal surface is square, the lateral surface is crescent, the proximal end is connected with the joint of the radius, the distal end is connected with the joint of the capitate bone, the periphery is adjacent to the scaphoid, the radius and the triangular bone, the soft tissue is less connected, and the blood supply is less. As the central axis of the wrist joint, the lunate bone is the only broad metacarpal side and narrow dorsal side bone in the carpal bones, and is closely related to the range of motion of the wrist joint and the triangular fibrocartilage. Aseptic necrosis is a painful disease of wrist with unknown cause, and the pressure around the lunar bone is increased under the action of external violence or inflammatory infection, so that the blood supply of the lunar bone is influenced, and the slow lunar bone is necrotized. In treatment, the lunar bone is usually cut off to remove the focus of infection, so that clinical symptoms can be relieved, but some scholars think that the simple cutting off of the lunar bone can cause the skull to move downwards to cause wrist joint disorder. Patent CN201680064685.3 discloses a way to fuse the navicular bone, i.e. the lunate is fused with the navicular bone, which plays a role in fixing the lunate, and simultaneously loses the functionality of the lunate. Patent CN201720232814.7 discloses a lunar prosthesis prepared by 3D printing, the perforation structure being designed in order to increase the flexibility of the lunate, but still limiting the partial motion function of the lunate. The lunar bone is a ring in the whole wrist joint, and for the pathological changes of the whole wrist joint, patents CN201510602315.8 and CN202020096938.9 disclose whole wrist joint prostheses which improve the stability of the wrist but sacrifice the flexibility of the wrist. These patents are different from the case of the indication of the wrist joint, and if the indication is only the indication of the lunate, such as lunate necrosis, but other joints (such as scaphoid, triquetrum, hamate, scaphoid, radius, etc.) are not damaged, there is no need to perform a wrist surgery or replacement. Therefore, the lunar prosthesis needs to be implanted to ensure the functionality of the whole wrist joint. The lunar implant can be classified into ceramic, titanium alloy, silica gel, nylon and the like according to materials, but because the modulus of the implant made of ceramic and metal materials is not matched with that of human bones, stress shielding is easy to generate, and bone loss is caused, so that high-performance polymer materials are mostly adopted at present. The traditional preparation method of the lunar prosthesis is a machining mode of mechanical cutting, belongs to material reduction manufacturing, and has high requirements on machining process and precision. The 3D printing can be used for preparing the lunar prosthesis with high simulation degree, but the lunar prosthesis with high surface roughness and low mechanical strength of the product is a bottleneck for restricting the popularization and the application of the technology.
Disclosure of Invention
The invention aims to provide a novel lunar prosthesis and a design and preparation method thereof, and aims to solve the technical problems that the lunar prosthesis with high simulation degree can be prepared by 3D printing in the prior art, but the lunar prosthesis with high surface roughness and low mechanical strength of a product is a bottleneck for restricting the popularization and application of the technology.
In order to achieve the purpose, the novel lunar prosthesis comprehensively considers the process constraints of a 3D printing forming technology and an injection molding forming technology, and comprises a lunar bone;
the lunar bone is provided with a radial moon joint surface, a cephalic moon joint surface, a hook moon joint surface, a trigone moon joint surface and a navicular moon joint surface which are respectively used for connecting the radial bone, the cephalic bone, the hook bone, the trigone bone and the navicular moon joint;
the lunar junction is characterized in that the lunar junction is also provided with a parting line and a pouring gate, the parting line is positioned at the joint of a radial lunar joint surface and a head lunar joint surface and surrounds the lunar junction for a circle, and the pouring gate is positioned on the parting line of the lunar junction.
A novel moon design method comprises the following steps,
designing a 3D forming reference plane, wherein the horizontal plane where the head-moon joint surface of the maximum concave surface of the lunar bone is placed is a reference plane;
the design of a lunar mold parting surface, wherein a closed loop surface formed along the contour boundary of the first moon, hook moon, triangle moon and boat moon joint surfaces is the mold parting surface;
the design of the lunar mold pouring system is characterized in that the pouring gate is positioned at a non-joint surface position in the middle of the lunar surface, and can be a curved surface center or a non-center.
Wherein, in the 'the closed ring surface formed along the contour boundary of the first moon, hook moon, triangle moon and boat moon joint surfaces is a mould parting surface',
the parting plane may be a plane surface, a section of a curved surface, or a combination thereof.
A novel method for making a moon bone comprises the following steps,
making a lunar CT image of the patient;
making a three-dimensional model drawing of the lunar bones;
designing a mold based on the lunar articular surface structure;
3D printing a mold for preparing the lunar bones;
the lunar prosthesis is prepared by an injection molding process.
Wherein, in the 'mold design based on the lunar articular surface structure',
and manufacturing an upper layer mold and a lower layer mold, and manufacturing an upper pouring gate and a lower pouring gate respectively at the connecting positions of the upper layer mold and the lower layer mold.
Wherein, in the step of manufacturing the upper layer die and the lower layer die,
and a parting surface is manufactured on one side of the lower-layer mold close to the upper-layer mold.
According to the novel lunar prosthesis and the design and preparation method thereof, the lunar bone is provided with the opposite moon (lunar concave surface) and the radial moon joint (lunar convex surface) through a mold design method based on a lunar bone geometric structure, the lunar bone mold prepared by 3D molding is subjected to targeted selection of a 3D molding reference surface and design of a mold parting surface, the mold comprises an upper layer mold and a lower layer mold, an upper pouring gate is manufactured on the upper layer mold, a lower pouring gate is manufactured on the lower layer mold, and the parting surface is formed on the lower layer mold, so that the injection molding quality of the lunar prosthesis is ensured and the lunar prosthesis is convenient to take out.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a lunar prosthesis according to the present invention.
Fig. 2 is a schematic structural view of a lunar prosthesis mold of the present invention.
Fig. 3 is a flow chart of the novel lunar design method of the present invention.
Fig. 4 is a flowchart of a method for manufacturing a new moon bone according to the present invention.
In the figure: 1-upper layer mold, 2-upper pouring gate, 3-parting surface, 4-lower pouring gate, 5-lower layer mold, 6-lunar bone, 61-radial lunar joint surface, 62-first lunar joint surface, 63-parting line and 64-pouring gate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, the present invention provides a novel lunar prosthesis, including a lunar bone,
the lunar bone is provided with a radial moon joint surface, a cephalic moon joint surface, a hook moon joint surface, a trigone moon joint surface and a navicular moon joint surface which are respectively used for connecting the radial bone, the cephalic bone, the hook bone, the trigone bone and the navicular moon joint;
the lunar junction is characterized in that the lunar junction is also provided with a parting line and a pouring gate, the parting line is positioned at the joint of a radial lunar joint surface and a head lunar joint surface and surrounds the lunar junction for a circle, and the pouring gate is positioned on the parting line of the lunar junction.
Referring to fig. 3, a novel lunar design method includes the following steps,
designing a 3D forming reference plane, wherein the horizontal plane where the head-moon joint surface of the maximum concave surface of the lunar bone is placed is a reference plane;
the design of the lunar mold parting surface, wherein a closed loop surface formed along the contour boundary of the first moon, hook moon, triangle moon and navicular joint surfaces is the mold parting surface, and the parting surface can be a plane or a section of curved surface or the combination of the plane and the section of curved surface;
the design of the lunar mold pouring system is characterized in that the pouring gate is positioned at a non-joint surface position in the middle of the lunar surface, and can be a curved surface center or a non-center.
Referring to fig. 2 and 4, a method for manufacturing a new moon bone includes the following steps,
making a lunar CT image of the patient;
making a three-dimensional model drawing of the lunar bones;
manufacturing an upper layer mold and a lower layer mold based on the mold design of a lunar joint surface structure, respectively manufacturing an upper pouring gate and a lower pouring gate at the connecting positions of the upper layer mold and the lower layer mold, and manufacturing a parting surface at one side of the lower layer mold close to the upper layer mold;
3D printing a mold for preparing the lunar bones;
the lunar prosthesis is prepared by an injection molding process.
In the embodiment, the design of the inner and outer joint surfaces of the lunar prosthesis is important, the flatness and the smoothness of the joint surfaces are high, and the occurrence probability of postoperative traumatic arthritis can be greatly reduced. Generally, injury causes cartilage contusion and exfoliation in joints, or fracture of joint surfaces has step separation and collapse to cause the joint surfaces to be uneven, cartilage degeneration can be caused after long-time movement, inflammatory reaction stimulates joint synovial hyperplasia, bony structures of the joint surfaces can be directly rubbed to cause joint dislocation and pain after the cartilage is exfoliated, and the bony hyperplasia is more and more serious.
3D printing a lunar model and extruding and injection molding the lunar prosthesis; the mold design method based on the geometrical structure of the lunar articular surface comprises the following steps: the lunar has 5 articular surfaces, and in order to ensure the injection molding quality of the lunar prosthesis and facilitate the extraction, a lunar mold prepared by 3D molding needs to be subjected to targeted selection of a 3D molding reference surface and design of a mold parting surface. 1, designing a 3D forming reference surface: the horizontal plane on which the concave meniscus of the lunar bone is placed is the reference plane. 2, designing a lunar mold parting surface: a closed loop surface formed along the contour boundary of the first moon, hook moon, triangle moon and boat moon joint surfaces is a mould parting surface; the parting surface can be a plane or a section of curved surface, or the combination of the two; 3, designing a lunar model pouring system: the pouring gate is positioned at the non-joint surface position in the middle of the lunar surface of the lunar, and can be a curved surface center or a non-center.
The specific implementation mode is as follows: designing a mold based on a lunar articular surface structure: designing a mold based on a lunar articular surface structure: 1, designing a 3D forming reference surface: the horizontal plane on which the concave meniscus of the lunar bone is placed is the reference plane. 2, designing a lunar mold parting surface: a closed loop surface formed along the contour boundary of the first moon, hook moon, triangle moon and boat moon joint surfaces is a mould parting surface; the parting plane can be a curved surface; 3, designing a lunar model pouring system: the pouring gate is positioned in the center of the non-articular surface in the middle of the lunar surface.
3D printing and preparing a lunar model: the 3D printing mode was SLM, the printing equipment was RenishawAM250, the die material was imported 316L stainless steel powder from AP & C, uk, and the printing parameters table 1:
table 1: printing power and speed and energy density thereof
Preparing the lunar prosthesis by an injection molding process:
the lunar prosthesis material is PEEK, the injection molding machine is RuiMing technology SZS30, the injection molding temperature is 420 ℃, the injection molding pressure is 20MPa, the mold clamping force is 6T, and the mold temperature is 200 DEG C
3D forming datum plane design of the prosthesis mould → parting plane design of the prosthesis mould → pouring system design of the prosthesis mould.
Wherein, the 3D shaping datum plane design of the false body mould comprises: the large joint surface, the convex-concave curved surface structure and the complex geometric structure are comprehensively considered, and the larger projection surface and the convex-concave curved surface with the complex structure are taken as the forming reference surface.
The printing support is reduced, the forming efficiency is improved, the forming stress is reduced, and the yield is improved.
Designing a parting surface of the prosthesis die: after the mold forming reference surface is determined, the geometrical symmetrical structure of the implant and the contour curved surface of the joint surface are comprehensively considered, and the parting surface is designed from bottom to top. The parting surface is designed according to a concave-convex structure in a layered manner, namely a projection method is adopted to find a convex extreme surface as the lower bottom surface of the parting layer, and a projection method is adopted to find a concave extreme surface as the upper surface of the parting layer; the number of parting layers is determined by the concave-convex structure. The parting surface is designed according to the contour curved surface of the joint surface, namely a skirt method is adopted to find out a larger joint contour line, and a curved surface which can be a plane or a non-plane is obtained as the parting surface.
The joint prosthesis can be taken out from the mould smoothly, the influence of a pouring mark on the bone joint surface is reduced, and the functionality of the bone joint surface is ensured; the exhaust from the parting surface is convenient, the melt flow is improved, and the manufacturing precision of the prosthesis is ensured.
And (3) designing a pouring system of the prosthesis mould: the pouring gate is designed as much as possible in the center of the symmetrical structure and at the non-articular surface.
The influence of the removal of the pouring opening material on the bone prosthesis, particularly the joint surface, is reduced (because the material at the pouring opening is integrated with the formed part and needs to be processed and removed later), so that the functionality of the bone joint surface is ensured; the melt can conveniently enter the cavity from the pouring runner.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A novel lunate prosthesis, comprising a lunate;
the lunar bone is provided with a radial moon joint surface, a cephalic moon joint surface, a hook moon joint surface, a trigone moon joint surface and a navicular moon joint surface which are respectively used for connecting the radial bone, the cephalic bone, the hook bone, the trigone bone and the navicular moon joint;
the lunar junction is characterized in that the lunar junction is also provided with a parting line and a pouring gate, the parting line is positioned at the joint of a radial lunar joint surface and a head lunar joint surface and surrounds the lunar junction for a circle, and the pouring gate is positioned on the parting line of the lunar junction.
2. A novel lunar design method based on the process constraints of 3D printing and injection molding technology for designing the novel lunar prosthesis as claimed in claim 1, which comprises the following steps,
designing a 3D forming reference plane, wherein the horizontal plane where the head-moon joint surface of the maximum concave surface of the lunar bone is placed is a reference plane;
the design of a lunar mold parting surface, wherein a closed loop surface formed along the contour boundary of the first moon, hook moon, triangle moon and boat moon joint surfaces is the mold parting surface;
the design of the lunar mold pouring system is characterized in that the pouring gate is positioned at a non-joint surface position in the middle of the lunar surface, and can be a curved surface center or a non-center.
3. The new lunar design method as claimed in claim 2, wherein in the "closed ring surface formed along the boundary of the contour of the first lunar, hook lunar, triangle lunar, and navicular lunar articular surfaces is the mold parting surface",
the parting plane may be a plane surface, a section of a curved surface, or a combination thereof.
4. A novel method for making a moon bone is characterized by comprising the following steps,
making a lunar CT image of the patient;
making a three-dimensional model drawing of the lunar bones;
designing a mold based on the lunar articular surface structure;
3D printing a mold for preparing the lunar bones;
the lunar prosthesis is prepared by an injection molding process.
5. The method for manufacturing a lunar New pattern according to claim 4, wherein in the "design of the mold based on the lunate articular surface Structure",
and manufacturing an upper layer mold and a lower layer mold, and manufacturing an upper pouring gate and a lower pouring gate respectively at the connecting positions of the upper layer mold and the lower layer mold.
6. The novel method of manufacturing a moon bone according to claim 5, wherein in the step of "manufacturing the upper mold and the lower mold",
and a parting surface is manufactured on one side of the lower-layer mold close to the upper-layer mold.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115363829A (en) * | 2022-09-19 | 2022-11-22 | 中国人民解放军联勤保障部队第九二〇医院 | Artificial lunate prosthesis and preparation method and clamping tool thereof |
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| CN109833121A (en) * | 2019-02-14 | 2019-06-04 | 重庆高新区生物智能制造研究院 | A kind of design method of patellar prosthesis |
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