CN112618116B - 3D prints full ankle joint false body - Google Patents
3D prints full ankle joint false body Download PDFInfo
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- CN112618116B CN112618116B CN202011635547.0A CN202011635547A CN112618116B CN 112618116 B CN112618116 B CN 112618116B CN 202011635547 A CN202011635547 A CN 202011635547A CN 112618116 B CN112618116 B CN 112618116B
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- prosthesis
- dovetail
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- groove
- talus
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- 210000000544 articulatio talocruralis Anatomy 0.000 title claims abstract description 22
- 210000002303 tibia Anatomy 0.000 claims abstract description 61
- 210000004233 talus Anatomy 0.000 claims abstract description 41
- 238000010146 3D printing Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 210000003423 ankle Anatomy 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 12
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 4
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 229910052588 hydroxylapatite Inorganic materials 0.000 claims description 4
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims description 4
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000000602 vitallium Substances 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 abstract description 6
- 125000006850 spacer group Chemical group 0.000 abstract description 5
- 238000004080 punching Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 210000000988 bone and bone Anatomy 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 3
- 229910001182 Mo alloy Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000010952 cobalt-chrome Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000002271 resection Methods 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 208000024779 Comminuted Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 206010031264 Osteonecrosis Diseases 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000459 calcaneus Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 210000003041 ligament Anatomy 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000450 navicular bone Anatomy 0.000 description 1
- 239000011664 nicotinic acid Substances 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
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
- A61F2/4202—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
-
- 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
- A61F2/30721—Accessories
- A61F2/30728—Collars; Bone edge protectors
-
- 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
- A61F2/4202—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
- A61F2002/4205—Tibial components
-
- 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
- A61F2/4202—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
- A61F2002/4207—Talar components
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00389—The prosthesis being coated or covered with a particular material
- A61F2310/00395—Coating or prosthesis-covering structure made of metals or of alloys
- A61F2310/00407—Coating made of titanium or of Ti-based alloys
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00389—The prosthesis being coated or covered with a particular material
- A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
- A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
Abstract
The invention discloses a 3D printing full ankle joint prosthesis, which comprises a tibia far-end prosthesis and a talus prosthesis, and is characterized in that a first gasket and a second gasket are arranged between the tibia far-end prosthesis and the talus prosthesis; the upper end of the first liner is connected with the tibia far-end prosthesis through a dovetail clamping mechanism; the lower end of the first liner is connected with the upper surface of the second liner through a rotating fit groove; the lower surface of the second spacer is connected to the talus prosthesis using a taper press fit configuration. The invention has the advantages that the invention has the first pad with buffer function and the second pad with high wear resistance for simulating the rotation of the ankle joint, the second pad is connected with the talus prosthesis by adopting a taper press fit structure, and the connection relationship is tight by utilizing the downward pressing acting force to the ankle joint when the human body is upright; the dovetail joint structure ensures that the tibia far-end prosthesis cannot be misplaced and separated in a human body after being installed with the first liner; avoid transverse punching and screwing at the distal end of the tibia, achieve the aim of repairing the whole motion balance of the joint and meet the biomechanical requirement.
Description
Technical Field
The invention belongs to the technical field of orthopedic medical instruments, and particularly relates to a 3D printing full ankle joint prosthesis.
Background
Talus is the largest irregular bone of the human body that is located in the ankle cavity and forms tibialis (ankle), subtalar and navicular joints with the distal tibial articular surface, anterior, medial, and posterior calcaneus articular surfaces, and navicular bones, respectively, and the anatomy is relatively complex. For patients with lesions of the total talus (including primary tumors of the talus, aseptic necrosis, severe comminuted fractures of the talus, etc.), the total ankle of the patient needs to be replaced with a 3D printed total ankle prosthesis. Traditional ankle joint prosthesis often leads to its fixed insecure because of patient's bone is relatively poor for ankle joint prosthesis becomes flexible easily, and the early stage bone of ankle joint prosthesis is grown into difficultly, influences ankle joint prosthesis's long-term stability in, and current ankle joint structure as an organic whole, the osteotomy of direct connection shin bone, every patient of adaptation that can not be fine, cost is with high costs.
Chinese patent application, application number CN201920703128.2, filing date 2019.05.16, grant bulletin number CN210749674U, grant bulletin date 2020.06.16, disclose a full ankle joint prosthesis is printed to artifical 3D of combination formula, including tibial prosthesis, connection pad and talus prosthesis, tibial prosthesis is including the tibial prosthesis fixed part and the tibial prosthesis body of connection, tibial prosthesis body is equipped with the cavity that holds the connection pad, tibial prosthesis body with the connection pad is connected, the connection pad is equipped with hemispherical cavity, the connection pad is equipped with four movable grooves, talus prosthesis is including talus prosthesis movable part, talus prosthesis connecting portion and talus prosthesis fixed part that connect gradually, talus prosthesis movable part is the hemisphere and matches with the hemispherical cavity of connection pad, the tibial prosthesis connecting portion is cylindrical, is equipped with four blocks on the lateral wall of the prosthetic connecting portion of bone, four blocks evenly distributed in the circumferencial direction, four blocks with four movable grooves match. The combined artificial 3D printing full ankle joint prosthesis has good motion bionic performance and is easy to install and repair.
Chinese patent application, application number CN201920181785.5, filing date 2019.02.01, grant bulletin number CN209678766U, grant bulletin date 2019.11.26, disclose a split type total ankle prosthesis for talus, including shank-talus joint shank-side part, still include the running fit piece, the running fit piece includes the calcaneal-talus joint shank-side part and the talus joint shank-side part of detachable connection. The total ankle prosthesis adopting the talus split type design is convenient to operate and install, solves the problems that in clinic, the prosthesis is difficult to place or is not installed in place, the surrounding soft tissues are damaged greatly in operation, even the surrounding fracture of the prosthesis occurs, and the like due to the conditions of more ligaments around the talus, smaller operation vision, insufficient operation space and the like, can effectively save operation time, and has good industrialization prospect.
The technical scheme of the above patent application all needs to implant screw tightening fixed knot structure at the tibia distal end, is applicable to the patient of tibia distal end excision, and screw tightening fixed knot constructs needs to be at the horizontal trompil of tibia distal end, by screw supporting screw tightening fixed knot construct when the patient walks vertically, does not utilize the natural function to ankle joint effort when the human body is upright completely, adaptation every patient that can not be fine.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems that the full ankle replacement scheme disclosed in the prior art is required to be implanted with a screw tightening and fixing structure at the far end of the tibia, the full ankle replacement scheme is suitable for patients with far end resection of the tibia, the screw tightening and fixing structure is required to be horizontally perforated at the far end of the tibia, the screw is supported by the screw to tighten and fixing structure when the patients walk vertically, the natural function of acting force on the ankle when the human body is not fully utilized, and each patient cannot be well adapted, the invention aims to provide the 3D printing full ankle prosthesis, the full ankle prosthesis is suitable for the patients without resection at the far end of the tibia, the downward pressing acting force on the ankle when the human body is upright is utilized, the transverse perforation screwing of the screw at the far end of the tibia is avoided, the whole motion balance of the prosthetic joint is achieved, and the biomechanical requirement of the prosthetic joint is met.
2. Technical proposal
In order to achieve the above purpose and achieve the above technical effects, the present invention adopts the following technical scheme:
a 3D printing full ankle joint prosthesis, which comprises a tibia far-end prosthesis and a talus prosthesis, and is characterized in that a first gasket and a second gasket are arranged between the tibia far-end prosthesis and the talus prosthesis; the upper end of the first liner is connected with the tibia far-end prosthesis through a dovetail clamping mechanism; the lower end of the first liner is connected with the upper surface of the second liner through a rotating fit groove; the lower surface of the second spacer is connected to the talus prosthesis using a taper press fit configuration.
In a specific embodiment of the invention, a tibia far-end contact surface is arranged on the tibia far-end prosthesis, hydroxyapatite is sprayed on the tibia far-end contact surface, and an anchor pin is arranged on the tibia far-end contact surface; the dovetail clamping mechanism comprises a dovetail groove, a positioning groove, a dovetail and a positioning block, wherein the positioning groove is arranged on one side of the tibia far-end prosthesis opposite to the tibia far-end contact surface, the notch of the dovetail groove is arranged on two sides of the positioning groove, one end of the dovetail groove is provided with an opening for the dovetail to be inserted, and the other end of the dovetail groove is closed and is in a horseshoe shape; the dovetail is arranged at the upper end of the first liner, and the positioning block is arranged on the upper surface of the dovetail; when the tibia far-end prosthesis is used, the dovetail is pushed into the dovetail groove from the opening of the dovetail groove, the positioning block enters the positioning groove, the tibia far-end prosthesis is connected with the first liner through the cooperation of the dovetail groove and the dovetail, and the relative fixation after the first liner is connected with the tibia far-end prosthesis is realized through the cooperation of the positioning groove and the positioning block.
In a specific embodiment of the invention, a fixed included angle is formed between the anchor pins and the contact surface of the distal tibia, the number of the anchor pins is three, and the three anchor pins are distributed in a 'delta' -shape to firmly connect the distal tibia prosthesis with the distal tibia.
In a specific embodiment of the invention, the tibial distal prosthesis and the talus prosthesis are made from a material selected from titanium alloys, prepared by 3D printing techniques.
In a specific embodiment of the present invention, a rotating fit groove and a limit stop are disposed at the lower end of the first gasket, the rotating fit groove is in a first arc shape concave toward the upper end of the first gasket, the limit stop is disposed at two sides of the rotating fit groove, and the contour of the limit stop is in a second arc shape opposite to the rotating fit groove; the upper surface of the second gasket is provided with a third arc which is convex outwards, the third arc is contained in the transmission matching groove, and the limit stop is abutted with two sides of the third arc.
In a specific embodiment of the invention, the width of the upper end of the first liner is larger than the width of the dovetail, and the edge of the dovetail groove is lapped on the upper end of the first liner, so that the contact area is increased, and the acting force during vertical walking is dispersed.
In a specific embodiment of the present invention, the material of the first pad is selected from polymer crosslinked polyethylene, and the polymer crosslinked polyethylene has the characteristics of high density and wear resistance, and the material has a buffering function, so that the impact between each part in the motion process is avoided, and the buffering function of the ankle joint of a human body is imitated.
In a specific embodiment of the present invention, the lower surface of the second pad is provided with a first insert, and the connection part between the third arc and the lower surface of the second pad is provided with a positioning protrusion; the section of the talus prosthesis is in an inverted trapezoid shape, and the upper surface of the talus prosthesis is provided with a first taper hole matched with the taper of the first insert and a first groove matched with the positioning protrusion; the talus prosthesis is provided with a calcaneal-talus-joint-talus-side part and a talarotalus-joint-talus-side part on both sides, a second insert is arranged on the calcaneal-talus-joint-talus-side part, and a third insert is arranged on the talarotalus-joint-talus-side part; the first groove and the positioning protrusion cooperate to prevent the second spacer from sliding horizontally with the talus prosthesis when a lateral force is applied.
In some embodiments of the present invention, a second fixing through hole is formed on the second insert; and a third fixing through hole is formed in the third insert.
In some embodiments of the invention, the material of the second pad is selected from cobalt chromium molybdenum alloy, and is prepared by a 3D printing technology, and the surface is subjected to high polishing treatment. The cobalt chrome molybdenum alloy has high wear resistance, is suitable for simulating the rotation of the ankle joint around the second liner, and provides support.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that: the tibia far-end contact surface of the tibia far-end prosthesis is sprayed with hydroxyapatite to promote the growth of tibia far-end bones, so that the grown new bones wrap the tibia far-end prosthesis, the connection is firmer, the first liner has a buffer function and a second liner with high wear resistance for simulating the rotation of an ankle joint, the second liner is connected with the talus prosthesis by adopting a taper press-fit structure, and the connection relationship is tight by utilizing the downward pressing acting force of a human body on the ankle joint when the human body is upright; the dovetail joint structure ensures that the tibia far-end prosthesis cannot be misplaced and separated in a human body after being installed with the first liner; avoid transversely punching the screw on the distal end of tibia, be applicable to the patient that the distal end of tibia does not resect, reach the whole motion balance of prosthetic joint and satisfy its biomechanics' requirement.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of the 3D printed total ankle prosthesis structure of the present invention.
Fig. 2 is a schematic left view of the distal tibial prosthesis of the present invention.
Fig. 3 is a schematic view of the bottom view of the distal tibial prosthesis of the present invention.
Fig. 4 is a right-side structural view of the first gasket of the present invention.
Fig. 5 is a schematic rear view of a first gasket of the present invention.
Fig. 6 is a schematic elevational view of a second gasket of the present invention.
Fig. 7 is a schematic elevational view of the talar prosthesis of the present invention.
In the figure: 1-a tibial distal prosthesis; 2-talus prosthesis; 3-a first liner; 4-a second liner; 5-tibial distal contact surface; 6-anchor pins; 7-a dovetail groove; 8-positioning grooves; 9-dovetails; 10-positioning blocks; 11-opening; 12-a rotating fit groove; 13-limit stops; 14-a second arc; 15-a third arc; 16-a first insert; 17-positioning protrusions; 18-a first taper hole; 19-a second insert; 20-a third insert; 21-a second fixing through hole; 22-a third fixing through hole; 24-first groove.
Detailed Description
The following description of the embodiments of the invention will be made apparent and complete in conjunction with the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, based on the embodiments of the invention, which would be apparent to one of ordinary skill in the art without making any inventive effort are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
In the description of the invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in the invention will be understood by those of ordinary skill in the art in a specific context.
As shown in fig. 1 to 7, a 3D printed total ankle prosthesis comprises a tibia distal prosthesis 1 and a talus prosthesis 2, and is characterized in that a first pad 3 and a second pad 4 are arranged between the tibia distal prosthesis 1 and the talus prosthesis 2; the upper end of the first liner 3 is connected with the tibia far-end prosthesis 1 through a dovetail 9 clamping mechanism; the lower end of the first gasket 3 is connected with the upper surface of the second gasket 4 through a rotating fit groove 12; the lower surface of the second spacer 4 is connected to the talus prosthesis 2 using a taper press fit.
The tibia far-end prosthesis 1 is provided with a tibia far-end contact surface 5, the tibia far-end contact surface 5 is sprayed with hydroxyapatite, and the tibia far-end contact surface 5 is provided with an anchor pin 6; the dovetail 9 clamping mechanism comprises a dovetail groove 7, a positioning groove 8, a dovetail 9 and a positioning block 10, wherein the positioning groove 8 is arranged on one side of the tibia far-end prosthesis 1 opposite to the tibia far-end contact surface 5, the notch of the dovetail groove 7 is arranged on two sides of the positioning groove 8, one end of the dovetail groove 7 is provided with an opening 11 for inserting the dovetail 9, and the other end is closed; the dovetail 9 is arranged at the upper end of the first liner 3, and the positioning block 10 is arranged on the upper surface of the dovetail 9; when the tibia far-end prosthesis 1 is used, the dovetail 9 is pushed into the dovetail groove 7 from the opening 11 of the dovetail groove 7, the positioning block 10 enters the positioning groove 8, the tibia far-end prosthesis 1 and the first liner 3 are connected through the cooperation of the dovetail groove 7 and the dovetail 9, and the relative fixation after the first liner 3 and the tibia far-end prosthesis 1 are connected is realized through the cooperation of the positioning groove 8 and the positioning block 10.
The anchor pins 6 form a fixed included angle with the tibia far-end contact surface 5, the number of the anchor pins 6 is three, and the three anchor pins 6 are distributed according to a 'figure shape' to firmly connect the tibia far-end prosthesis with the tibia far-end.
The materials used for the tibial distal prosthesis 1 and the talus prosthesis 2 are both chosen from titanium alloys, obtained by 3D printing techniques.
The lower end of the first gasket 3 is provided with a rotating fit groove 12 and a limit stop 13, the rotating fit groove 12 is in a first arc shape concave inwards towards the upper end of the first gasket 3, the limit stop 13 is arranged on two sides of the rotating fit groove 12, and the outline of the limit stop 13 is in a second arc shape 14 opposite to the rotating fit groove 12; the upper surface of the second gasket 4 is provided with a third arc 15 which is convex outwards, the third arc 15 is contained in the transmission matching groove, and the limit stop 13 is abutted with two sides of the third arc 15.
The width of the upper end of the first liner 3 is larger than that of the dovetail 9, and the edge of the dovetail groove 7 is lapped on the upper end of the first liner 3, so that the contact area is increased, and the acting force during vertical walking is dispersed.
The material of the first liner 3 is selected from high molecular crosslinked polyethylene, has the characteristics of high density and wear resistance, and simultaneously has a buffer function by using the material, so that the impact between all parts in the movement process is avoided, and the material imitates the buffer function of the ankle joint of a human body.
The lower surface of the second gasket 4 is provided with a first insert 16, and the joint of the third arc 15 and the lower surface of the second gasket 4 is provided with a positioning protrusion 17; the section of the talus prosthesis 2 is in an inverted trapezoid shape, and the upper surface of the talus prosthesis 2 is provided with a first taper hole 18 matched with the first insert 16 in a taper way and a first groove 24 matched with the positioning protrusion 17; the talus prosthesis 2 is provided with a calcaneal-talar-and a navicular-talar-side part on which the second insert 19 is arranged and a third insert 20 is arranged on both sides; the first groove 24 cooperates with the positioning projection 17 to prevent horizontal sliding of the second spacer 4 with the talus prosthesis 2 in the presence of lateral forces.
The second insert 19 is provided with a second fixing through hole 21; the third insert 20 is provided with a third fixing through hole 22.
The material of the second pad 4 is selected from cobalt chrome molybdenum alloy, which is prepared by a 3D printing technology, and the surface is subjected to high polishing treatment. The cobalt chrome molybdenum alloy has a high wear resistance and is suitable for simulating the rotation of the ankle joint around the second liner 4 and provides support.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A 3D printed total ankle joint prosthesis, comprising a tibia far-end prosthesis and a talus prosthesis, and being characterized in that a first gasket and a second gasket are arranged between the tibia far-end prosthesis and the talus prosthesis; the upper end of the first liner is connected with the tibia far-end prosthesis through a dovetail clamping mechanism; the lower end of the first liner is connected with the upper surface of the second liner through a rotating fit groove; the lower surface of the second pad is connected with the talus prosthesis by adopting a taper press fit structure;
the tibia far-end prosthesis is provided with a tibia far-end contact surface, hydroxyapatite is sprayed on the tibia far-end contact surface, and an anchor pin is arranged on the tibia far-end contact surface; the dovetail clamping mechanism comprises a dovetail groove, a positioning groove, a dovetail and a positioning block, wherein the positioning groove is arranged on one side of the tibia far-end prosthesis opposite to the tibia far-end contact surface, the notch of the dovetail groove is arranged on two sides of the positioning groove, one end of the dovetail groove is provided with an opening for the dovetail to be inserted, and the other end of the dovetail groove is closed; the dovetail is arranged at the upper end of the first liner, and the positioning block is arranged on the upper surface of the dovetail;
the width of the upper end of the first liner is larger than that of the dovetail, and the edge of the dovetail groove is lapped at the upper end of the first liner;
the lower end of the first gasket is provided with a rotating fit groove and a limit stop, the rotating fit groove is in a first arc shape concave inwards towards the upper end of the first gasket, the limit stop is arranged on two sides of the rotating fit groove, and the outline of the limit stop is in a second arc shape opposite to the rotating fit groove; the upper surface of the second gasket is provided with a third arc which is convex outwards, the third arc is contained in the transmission matching groove, and the limit stop is abutted with two sides of the third arc;
the lower surface of the second liner is provided with a first insert, and the joint of the third arc and the lower surface of the second liner is provided with a positioning protrusion; the section of the talus prosthesis is in an inverted trapezoid shape, and the upper surface of the talus prosthesis is provided with a first taper hole matched with the taper of the first insert and a first groove matched with the positioning protrusion; the talus prosthesis is provided with a calcaneal-talar-joint-talar-side component and a talarotalar-joint-talar-side component on both sides, a second insert being provided on the calcaneal-talar-joint-talar-side component, and a third insert being provided on the talarotalar-joint-talar-side component.
2. The 3D printed total ankle prosthesis of claim 1 wherein: the anchor pins and the tibia far-end contact surface form a fixed included angle, the number of the anchor pins is three, and the three anchor pins are distributed according to a 'delta' shape.
3. A 3D printed total ankle prosthesis according to claim 2, wherein: the tibial distal prosthesis is made of a material selected from titanium alloy and is prepared by a 3D printing technology.
4. The 3D printed total ankle prosthesis of claim 1 wherein: the material of the first gasket is selected from high molecular cross-linked polyethylene.
5. The 3D printed total ankle prosthesis of claim 1 wherein: the second insert is provided with a second fixing through hole; and a third fixing through hole is formed in the third insert.
6. The 3D printed total ankle prosthesis of claim 1 wherein: the material of the second pad is selected from cobalt-chromium-molybdenum alloy, the second pad is prepared by a 3D printing technology, and the surface is subjected to high polishing treatment.
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| CN113440321B (en) * | 2021-07-06 | 2022-06-07 | 四川大学华西医院 | Wing type medial and lateral ankle adjustable tumor semi-ankle joint prosthesis |
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