CN115227460A - Variable-curvature unicondylar knee joint prosthesis and manufacturing method thereof - Google Patents
Variable-curvature unicondylar knee joint prosthesis and manufacturing method thereof Download PDFInfo
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- CN115227460A CN115227460A CN202210860749.8A CN202210860749A CN115227460A CN 115227460 A CN115227460 A CN 115227460A CN 202210860749 A CN202210860749 A CN 202210860749A CN 115227460 A CN115227460 A CN 115227460A
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- 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
- A61F2/38—Joints for elbows or knees
- A61F2/3859—Femoral components
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- 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
- A61F2/38—Joints for elbows or knees
- A61F2/389—Tibial components
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Abstract
The invention discloses a variable curvature unicondylar knee joint prosthesis and a manufacturing method thereof, comprising a femur unicondylar and a tibia liner prosthesis; the femoral unicondylar prosthesis formed by the variable curvature curved surfaces has high matching performance with bone tissues, and the instantaneous rotating center formed by each curved surface changes in a J shape, so that the stable transition of the femoral unicondylar prosthesis and each curved surface is ensured; based on the tibia liner prosthesis matched with the femur unicondylar design, the lower surface of the liner is designed into a microporous structure to realize biological fixation with bone tissues; the femoral unicondylar and the tibial liner are prepared through a 3D printing process, and a printing path is designed according to a main stress trace of finite element analysis, so that the wear resistance and the mechanical strength of the knee joint prosthesis are enhanced. The variable curvature unicondylar knee joint prosthesis and the manufacturing method thereof provided by the invention have the advantages of high appearance matching property and motion stability, excellent wear resistance and biological fixation performance, and improved motion stability and service life of the unicondylar knee joint prosthesis.
Description
Technical Field
The invention belongs to the technical field of artificial joints, and particularly relates to a variable-curvature unicondylar knee joint prosthesis and a manufacturing method thereof.
Background
The knee joint, the most complex and largest joint of the human body, is the hinge between the two longest bones (femur and tibia) of the lower limb, and mainly bears the weight and movement functions of the human body. However, the complicated anatomical structure and mechanical environment of the knee joint make the knee joint susceptible to diseases such as trauma and osteoarthritis, which leads to a pathological process that evolves from unicondylar wear to total knee wear, and brings great pressure to the life economy and physical and mental health of patients.
The existing knee joint product adopts injection molding single-curvature femoral condyle and tibia liner to form the knee joint prosthesis. However, the simple femoral condyle surface has poor matching with the patient joint, and is easy to generate the problems of over-coverage or under-coverage, and meanwhile, the problem of unstable movement can be generated due to sudden change of the joint surface during the flexion movement, and the mechanical fixation adopted between the tibial gasket and the bone tissue is easy to generate fatigue failure.
Therefore, the current knee joint products are more and more difficult to meet the requirements of patients on long service life, safety and reliability of the implanted prosthesis.
Disclosure of Invention
The invention aims to solve the technical problem of providing a variable curvature unicondylar knee joint prosthesis and a manufacturing method thereof aiming at the defects in the prior art.
The invention adopts the following technical scheme:
the utility model provides a variable curvature unicondylar knee joint prosthesis, includes the shin bone liner, opens the recess on the shin bone liner, and profile matching thighbone unicondylar in the recess, the outline of thighbone unicondylar include a plurality of variable curvature curved surfaces, and the instantaneous center of rotation that a plurality of variable curvature curved surfaces are constituteed is J style of calligraphy and distributes, and the internal surface of thighbone unicondylar is provided with the fixed column that is used for connecting the bone tissue.
Specifically, the variable curvature curved surfaces include five curved surfaces, namely a femur front end curved surface, a femur oblique front end curved surface, a femur far end curved surface, a femur oblique rear end curved surface and a femur rear end curved surface, and the radius size of the femoral unicondylar is reduced from the femur front end curved surface to the femur rear end curved surface in sequence.
Specifically, the fixing columns comprise short fixing columns and long fixing columns, the long fixing columns are perpendicular to the curved surface corresponding to the oblique front end of the femur, and the short fixing columns are located on the curved surface corresponding to the front end of the femur.
Further, the length ratio of the long fixing column to the short fixing column is 4: (2-3).
Specifically, the groove sequentially comprises a tibia front end curved surface, a tibia oblique front end curved surface and a tibia far end curved surface, and the radiuses of the tibia front end curved surface, the tibia oblique front end curved surface and the tibia far end curved surface are all larger than the radius of the curved surface of the femur unicondylar matched with the tibia front end curved surface, the tibia oblique front end curved surface and the tibia far end curved surface.
Specifically, the lowest point of the recess coincides with the lowest point of the lateral surface of the femoral unicondylar.
Specifically, the tibial insert is aligned with the natural joint line and the joint line formed by the femoral unicondylar.
Specifically, the femoral unicondylar and the tibial liner are prepared by 3D printing.
Specifically, a microporous structure is arranged at the contact part of the lower surface of the tibial gasket and bone tissues.
The invention has another technical scheme that the manufacturing method of the variable curvature unicondylar knee joint prosthesis respectively adopts a 3D printing process to prepare the femoral unicondylar and the tibial gasket; the printing path of the femoral unicondylar is based on a main stress trace of finite element analysis, the outer layer is designed to be a concentric path to improve the wear resistance, the inner layer is divided into 4 areas and is designed to be a partitioned vertical line path to improve the mechanical strength, and the fixing columns are printed in a criss-cross mode; the printing path of the tibial gasket and the femoral unicondylar outline path are kept parallel, and the printing path of the lower surface of the tibial gasket is designed into a microporous structure.
Compared with the prior art, the invention at least has the following beneficial effects:
a variable curvature unicondylar knee joint prosthesis aims at the problems of poor matching performance and unstable motion caused by currently and clinically generally adopting a unicondylar or triconvex knee joint prosthesis, and a plurality of groups of variable curvature curved surfaces form a femur condyle and a tibia liner, so that on one hand, high matching performance can be kept with natural joints, uneven stress transmission and bone loss caused by over-covering or under-covering of the prosthesis are avoided, on the other hand, the span difference among the curved surfaces is reduced, the stable transition among the curved surfaces during the flexion motion of the knee joint is improved, and the motion stability is ensured; the variable-curvature knee joint prosthesis designed by the invention has high matching performance with bone tissues in appearance, can have good motion stability at high and low flexion angles during motion, has excellent friction resistance and reliable bonding strength with the bone tissues, and improves the service life and safety of the whole prosthesis and the comfort of a patient after implantation.
Furthermore, the femoral condyle prosthesis adopts but is not limited to 5 variable-curvature curved surfaces, so that the matching performance between the prosthesis and bone tissues is improved, and the failure of the prosthesis caused by uneven matching is avoided. The radius size of the femoral unicondylar is reduced from the curved surface of the front end of the femur to the curved surface of the rear end of the femur in sequence, so that the instantaneous rotation center is distributed in a J shape, the motion characteristics of the natural knee joint of a normal person are met, and the motion stability and the comfort of the patient after prosthesis replacement are improved.
Furthermore, the long fixing columns are perpendicular to the curved surface corresponding to the oblique front end of the femur, and the short fixing columns are located on the curved surface corresponding to the front end of the femur, so that the knee joint can bear external loads in different directions at low and high flexion angles, and the overall mechanical strength of the prosthesis is improved. Meanwhile, the long fixing column and the short fixing column are used for fixing the femoral condyle prosthesis from the horizontal plane and the two surfaces of the 30-degree oblique front surface respectively, so that the femoral condyle prosthesis is not easy to fall off.
Further, the length ratio of the long fixing column to the short fixing column is 4:3 to 4:2, guaranteed that thighbone condyle prosthesis can be by firm combination to the bone tissue on, and the fixed column can not break under high bucking angle.
Further, the recess includes shin bone front end curved surface in proper order, oblique front end curved surface of shin bone and shin bone distal end curved surface, carry out the appearance cooperation through the curved surface of three curved surface and thighbone condyle prosthesis, constitute motion friction surface, make the two have high appearance matching degree, increase area of contact, reduce stress concentration, improve articular antifriction, the shin bone front end curved surface, the radius of the oblique front end curved surface of shin bone and shin bone distal end curved surface all is greater than the curved surface radius of the simple condyle of thighbone of complex with it, it can be in the recess smooth motion of shin bone liner prosthesis to have guaranteed thighbone condyle prosthesis, degree of freedom when having guaranteed joint prosthesis motion.
Furthermore, the lowest point of the groove is coincident with the lowest point of the outer surface of the femoral unicondylar, so that transition fit between the femoral condyle and the tibial lining prosthesis is avoided.
Furthermore, the joint line formed by the tibia liner and the femoral unicondylar is consistent with the natural joint line, so that the position of the knee joint prosthesis in motion is ensured to be consistent with the natural knee joint, and the force line and the motion posture of a patient after the operation are favorably not changed.
Furthermore, the variable curvature unicondylar knee joint prosthesis is prepared by adopting a 3D printing process, and the main stress trace of finite element analysis is taken as a printing path, so that the overall mechanical strength of the joint and the wear resistance during movement are improved.
Furthermore, the micro-porous structure on the tibial gasket can realize biological fixation with bone tissues, and the long-term joint bonding strength of the joint is improved.
A manufacturing method of a variable-curvature unicondylar knee joint prosthesis adopts a 3D printing process to prepare the prosthesis, and takes a main stress trace of finite element analysis as a printing path, so that the overall mechanical strength of the joint and the wear resistance during movement are improved.
In conclusion, the invention can not only keep high matching property with natural joints, avoid uneven stress transmission and bone loss caused by over-covering or under-covering, but also improve the stable transition among curved surfaces during the flexion of the knee joint and ensure the stability of the movement; the micro-porous structure on the tibia liner can be biologically fixed with bone tissues, and the long-term joint strength of the joint is improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic view of the overall structure of a variable curvature unicondylar knee prosthesis of the present invention;
FIG. 2 is a side view of a variable curvature femoral unicondylar prosthesis of the present invention;
FIG. 3 is a side view of a variable curvature tibial spacer prosthesis of the present invention;
FIG. 4 is a bottom view of the variable curvature tibial insert prosthesis of the present invention;
FIG. 5 is a schematic view of a 3D printing path of a variable curvature femoral unicondylar prosthesis of the present invention;
FIG. 6 is a fitted sagittal view.
Wherein: 1. a femoral unicondylar; 2. a tibial insert; 3. a femoral anterior end curve; 4. a femoral oblique anterior end curve; 5. a femoral distal curve; 6. a femoral oblique posterior end curved surface; 7. a femoral posterior curve; 8. short fixed columns; 9. a long fixing column; 10. an instantaneous center of rotation; 11. a tibial insert pocket; 12. a tibial anterior end curved surface; 13. a tibial oblique anterior end curve; 14. a tibial distal curve; 15. a microporous structure; 16. a primary stress trace.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element 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. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, 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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention provides a variable curvature unicondylar knee joint prosthesis and a manufacturing method thereof, the femoral unicondylar prosthesis and bone tissues formed by variable curvature curved surfaces have high matching performance, and the instantaneous rotating center formed by each curved surface is changed in a J shape, so that the stable transition of the femoral unicondylar prosthesis and the bone tissues among the curved surfaces is ensured; based on the tibia liner prosthesis matched with the femur unicondylar design, the lower surface of the liner is designed into a microporous structure to realize biological fixation with bone tissues; the femoral unicondylar and the tibial liner are prepared through a 3D printing process, and a printing path is designed on the basis of a main stress trace of finite element analysis, so that the wear resistance and the mechanical strength of the knee joint prosthesis are enhanced. The invention not only has high appearance matching performance and motion stability, but also has excellent wear resistance and biological fixation performance, improves the motion stability of the unicondylar knee joint prosthesis and prolongs the service life of the unicondylar knee joint prosthesis.
Referring to fig. 1, the variable curvature unicondylar knee prosthesis of the present invention includes a femoral unicondylar 1 and a tibial pad 2; the tibial insert 2 is located on the underside of the femoral unicondylar 1.
Referring to fig. 2, the outer contour of the femoral unicondylar 1 includes, but is not limited to, five curvature-variable curved surfaces, including a femoral anterior end curved surface 3, a femoral oblique anterior end curved surface 4, a femoral distal end curved surface 5, a femoral oblique posterior end curved surface 6, and a femoral posterior end curved surface 7, the radius of the femoral unicondylar 1 decreases from the femoral anterior end to the posterior end in sequence, an instantaneous center of rotation 10 formed by the femoral anterior end curved surface 3, the femoral oblique anterior end curved surface 4, the femoral distal end curved surface 5, the femoral oblique posterior end curved surface 6, and the femoral posterior end curved surface 7 is distributed in a "J" shape to improve the motion stability, and two fixing posts are provided on the inner surface of the femoral unicondylar 1 to connect bone tissues.
Referring to FIG. 6, the center of the front radius of the sagittal plane corresponds to the top of the J-shape, and the center of the rear radius of the sagittal plane corresponds to the bottom of the J-shape.
Two fixed columns include short fixed column 8 and long fixed column 9, on the oblique front end curved surface 4 of thighbone that the oblique front end of thighbone that long fixed column 9 perpendicular to thighbone corresponds, short fixed column 8 is located the thighbone front end curved surface 3 that the thighbone front end corresponds, and the length ratio of long fixed column 9 and short fixed column 8 is 4: (2-3).
Referring to fig. 3, the tibial gasket 2 is provided with a groove structure, the groove structure is composed of a tibia front end curved surface 12, a tibia oblique front end curved surface 13 and a tibia far end curved surface 14, and the lowest point of the groove structure coincides with the lowest point of the outer surface of the femoral unicondylar 1.
The radius of each curved surface in the tibial gasket 2 is larger than the radius of the curved surface of the femoral unicondylar prosthesis matched with the curved surface, the tibial gasket 2 is turned inwards for 3 degrees and is inclined backwards for 7 degrees on the whole, and the joint line formed by the tibial gasket 2 and the femoral unicondylar 1 is ensured to be consistent with the natural joint line.
Referring to fig. 4, the lower surface of the tibial insert 2 in contact with bone tissue is printed with a micro-porous structure 15 to improve the interfacial biological bonding strength.
Wherein the pore size of the microporous structure 15 is 200 to 500 μm.
Referring to fig. 5, the present invention provides a method for manufacturing a variable curvature unicondylar knee prosthesis, comprising the following steps:
respectively preparing femoral unicondylar and tibial gasket prosthesis by adopting a 3D printing process;
the printing path of the femoral unicondylar 1 is based on a main stress trace 16 of finite element analysis, the outer layer is designed to be a concentric path to improve the wear resistance, the inner layer is divided into 4 areas and designed to be a partition vertical line path to improve the mechanical strength, and the two fixing columns are printed in a vertically and horizontally staggered mode to ensure that the mechanical strength is sufficient when the two fixing columns are at different buckling angles.
The printing path of the tibial gasket 2 and the outline path of the femoral unicondylar 1 are kept parallel to reduce the friction coefficient, and the printing path of the lower surface of the tibial gasket 2 is designed into a micro-porous structure to promote the bone tissue to grow into the porous interior, so that the combination strength between the prosthesis and the bone tissue is improved through mechanical locking.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Take the design and manufacturing process of a variable curvature unicondylar knee prosthesis as an example.
Variable curvature unicondylar knee joint prosthesis includes shin bone liner 2, and it has the recess to open on the shin bone liner 2, is provided with interior profile matching thighbone unicondylar 1 in the recess, and thighbone unicondylar 1's outline includes a plurality of variable curvature curved surfaces, and the instantaneous center of rotation 10 that a plurality of variable curvature curved surfaces are constituteed is J style of calligraphy and distributes, and thighbone unicondylar 1's internal surface is provided with the fixed column that is used for connecting the bone tissue. The femoral unicondylar 1 and the tibial gasket 2 are prepared by 3D printing.
The design and manufacture of the variable curvature unicondylar knee prosthesis comprises the following processes:
(1) Firstly, acquiring imaging data of a knee joint, extracting the outer contour of the knee joint of a patient through Mimics software, establishing a triangular patch model through Geomic Wrap software, and smoothing, denoising, materializing and meshing the surface to obtain a knee joint three-dimensional model with high consistency with an original joint;
(2) Establishing a reference plane of a crown and a sagittal plane of the inner side of the femoral condyle, fitting the sagittal plane by using radii of 5 different curvatures, fitting a coronal plane by using radii of 1 different curvatures, and obtaining an initial femoral prosthesis through lofting scanning;
(3) Establishing an osteotomy reference plane of the femoral condyle, wherein the horizontal osteotomy thickness is 10mm, the osteotomy thickness is 7mm when the front end of the femur is inclined forwards by 30 degrees, the osteotomy thickness is 10mm when the inclined rear end of the femur is inclined backwards by 45 degrees, the osteotomy thickness is 10mm when the rear end of the femur is in a vertical direction, and the osteotomy thickness is also 10mm;
(4) Assembling the initial femoral prosthesis and the resected femoral condyle, obtaining the femoral prosthesis through Boolean operation, and fixing the femoral prosthesis with the diameter of 6mm and the lengths of 20mm and 15mm respectively;
(5) Establishing a reference surface of the tibia osteotomy, fitting the outer contour of the tibia after the osteotomy, and obtaining an initial tibia prosthesis with the thickness of 11mm by stretching;
(6) Establishing a lowest point of a tibial plateau, a coronal plane and a sagittal plane datum plane, establishing a sagittal plane outline of a groove on the sagittal plane by using 3 curves but not limited to 3 curves for the lowest point, establishing an outer contour by using a single curvature radius on the coronal plane, and simultaneously, the curvature radius of a tibial prosthesis is larger than that of a corresponding femoral prosthesis;
(7) By lofting the resected partial body, a recess configuration is obtained having a matching femoral condyle.
(8) The tibia stand column is designed to be rectangular, the length of the tibia stand column is 30mm, the width of the tibia stand column is 5mm, the height of the tibia stand column is 6mm, and the aperture of the tibia stand column is 0.75mm.
After the design is completed, main stress traces of the femoral condyle and the tibial pad prosthesis are obtained through finite element analysis, the printing path is designed, and then the knee joint prosthesis is prepared through a 3D printer.
The sagittal curvature radii of the femoral condyle prosthesis are 43.72mm, 35.78mm, 28.45mm, 20.54mm and 16.12mm in sequence, the difference of the curvature radii is in a uniform reduction trend, the span difference between all the regions is reduced, and the stability of the knee joint during movement is improved.
The sagittal plane curvature radiuses of the tibial gasket upper groove structure are 87.44mm, 71.56mm and 56.90mm in sequence, and are all larger than the curvature radiuses corresponding to the femoral condyle prosthesis sagittal plane, so that the femoral condyle has enough freedom of movement during the movement of the tibial gasket groove and can move smoothly.
In conclusion, according to the variable curvature unicondylar knee joint prosthesis and the manufacturing method thereof, the unicondylar knee joint prosthesis is constructed by the regularly changed multiple curved surfaces, high matching performance can be achieved between the prosthesis and natural bone tissues, the problems of uneven stress distribution and bone loss caused by the traditional knee joint are avoided, the span difference between the curved surfaces is reduced by the variable curvature knee joint with the J-shaped instantaneous rotation center, and the stability of the knee joint during movement is improved. The micro-porous structure on the lower surface of the tibia liner can promote the ingrowth of bone tissues, biological combination between the prosthesis and the bone is realized, the problems of thermal injury and infirm fixation caused by fixation of traditional bone cement are avoided, and the long-term combination strength of the joint and the prosthesis is improved. The prosthesis is prepared by adopting a 3D printing process, and the main stress trace of finite element analysis is taken as a printing path, so that the overall mechanical strength of the joint and the wear resistance during movement are improved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a variable curvature unicondylar knee joint prosthesis, its characterized in that includes shin bone liner (2), it has the recess to open on shin bone liner (2), profile matching thighbone unicondylar (1) in the recess, the outline of thighbone unicondylar (1) includes a plurality of variable curvature curved surfaces, instantaneous center of rotation (10) that a plurality of variable curvature curved surfaces are the J style of calligraphy and distribute, the internal surface of thighbone unicondylar (1) is provided with the fixed column that is used for connecting the bone tissue.
2. The variable curvature unicondylar knee prosthesis according to claim 1, wherein the variable curvature curved surfaces include five, namely a femur front end curved surface (3), a femur oblique front end curved surface (4), a femur distal end curved surface (5), a femur oblique rear end curved surface (6) and a femur rear end curved surface (7), and the radius size of the femur unicondylar (1) decreases from the femur front end curved surface (3) to the femur rear end curved surface (7).
3. The variable curvature unicondylar knee prosthesis of claim 1, wherein the fixation posts comprise a short fixation post (8) and a long fixation post (9), the long fixation post (9) is perpendicular to the curved surface corresponding to the oblique front end of the femur, and the short fixation post (8) is positioned on the curved surface corresponding to the front end of the femur.
4. The variable curvature unicondylar knee prosthesis of claim 3, wherein the length ratio of the long fixation posts (9) to the short fixation posts (8) is 4: (2-3).
5. The variable curvature unicondylar knee prosthesis of claim 1, wherein the groove comprises a tibia front end curved surface (12), a tibia oblique front end curved surface (13) and a tibia distal end curved surface (14) in sequence, and the radii of the tibia front end curved surface (12), the tibia oblique front end curved surface (13) and the tibia distal end curved surface (14) are all larger than the radius of the curved surface of the femur unicondylar (1) matched with the tibia front end curved surface, the tibia oblique front end curved surface and the tibia distal end curved surface.
6. The variable curvature unicondylar knee prosthesis of claim 1, wherein the lowest point of the recess coincides with the lowest point of the outer surface of the femoral unicondylar (1).
7. The variable curvature unicondylar knee prosthesis of claim 1, wherein the tibial insert (2) coincides with the natural joint line and the joint line formed by the femoral unicondylar (1).
8. The variable curvature unicondylar knee prosthesis of claim 1, wherein the femoral unicondylar (1) and tibial insert (2) are prepared using 3D printing.
9. The variable curvature unicondylar knee prosthesis of claim 1, wherein a micro-porous structure (15) is provided where the lower surface of the tibial insert (2) contacts bone tissue.
10. A method for manufacturing a variable curvature unicondylar knee prosthesis according to claim 1, wherein the femoral unicondylar (1) and the tibial gasket (2) are prepared by 3D printing process respectively; the printing path of the femoral unicondylar (1) is based on a main stress trace of finite element analysis, the outer layer is designed to be a concentric path to improve the wear resistance, the inner layer is divided into 4 areas and is designed to be a partitioned vertical line path to improve the mechanical strength, and the fixing columns are printed in a criss-cross mode; the printing path of the tibial gasket (2) and the outline path of the femoral unicondylar (1) are kept parallel, and the printing path of the lower surface of the tibial gasket (2) is designed to be a microporous structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115844600A (en) * | 2023-01-17 | 2023-03-28 | 山东省医疗器械和药品包装检验研究院 | Device and method for measuring relative angular movement of knee joint prosthesis |
| CN116747055A (en) * | 2023-08-18 | 2023-09-15 | 浙江大学 | Knee joint prosthesis and manufacturing method thereof |
| CN117100467A (en) * | 2023-10-24 | 2023-11-24 | 北京力达康科技有限公司 | Knee joint prosthesis |
-
2022
- 2022-07-21 CN CN202210860749.8A patent/CN115227460A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115844600A (en) * | 2023-01-17 | 2023-03-28 | 山东省医疗器械和药品包装检验研究院 | Device and method for measuring relative angular movement of knee joint prosthesis |
| CN116747055A (en) * | 2023-08-18 | 2023-09-15 | 浙江大学 | Knee joint prosthesis and manufacturing method thereof |
| CN116747055B (en) * | 2023-08-18 | 2023-11-07 | 浙江大学 | Knee joint prosthesis and manufacturing method thereof |
| CN117100467A (en) * | 2023-10-24 | 2023-11-24 | 北京力达康科技有限公司 | Knee joint prosthesis |
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