CN107693166B - Femoral condyle prosthesis and artificial knee joint - Google Patents
Femoral condyle prosthesis and artificial knee joint Download PDFInfo
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- CN107693166B CN107693166B CN201710917497.7A CN201710917497A CN107693166B CN 107693166 B CN107693166 B CN 107693166B CN 201710917497 A CN201710917497 A CN 201710917497A CN 107693166 B CN107693166 B CN 107693166B
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- cam
- femoral condyle
- intercondylar box
- connecting piece
- condyle prosthesis
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- 210000000629 knee joint Anatomy 0.000 title claims abstract description 23
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 12
- 239000000919 ceramic Substances 0.000 claims description 12
- 239000000602 vitallium Substances 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 6
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract description 8
- 230000033001 locomotion Effects 0.000 description 9
- 230000002035 prolonged effect Effects 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 210000003127 knee Anatomy 0.000 description 5
- 210000002967 posterior cruciate ligament Anatomy 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000001356 surgical procedure Methods 0.000 description 2
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010952 cobalt-chrome Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013150 knee replacement Methods 0.000 description 1
- 210000003041 ligament Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007170 pathology Effects 0.000 description 1
- 230000035790 physiological processes and functions Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002271 resection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- A61F2/38—Joints for elbows or knees
- A61F2/3859—Femoral 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
- A61F2/38—Joints for elbows or knees
- A61F2/3836—Special connection between upper and lower leg, e.g. constrained
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Physical Education & Sports Medicine (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
The invention relates to the technical field of medical appliances, in particular to a femoral condyle prosthesis and an artificial knee joint. The femoral condyle prosthesis comprises a femoral condyle basic body and a cam; the cam is arranged in the intercondylar box of the femoral condyle basic body and is rotatably connected with the intercondylar box. The artificial knee joint comprises the femoral condyle prosthesis. The invention aims to provide a femoral condyle prosthesis and an artificial knee joint, which are used for solving the technical problem of serious abrasion of a contact part of an upright post and a cam in the prior art.
Description
Technical Field
The invention relates to the technical field of medical appliances, in particular to a femoral condyle prosthesis and an artificial knee joint.
Background
The artificial knee joint prosthesis is implanted into a human body after knee joint replacement operation, and has the function of recovering normal physiological functions of the human body. In knee replacement surgery, if the patient's pathology is severe, then there is no way for the cruciate ligament to continue to remain and an intra-operative resection is required. For patients with a cut posterior cruciate ligament, only posterior stabilized prostheses (i.e., PS prostheses) are used for surgery.
For posterior stabilized knee prostheses, since the posterior cruciate ligament is surgically removed, a POST-CAM mechanism (i.e., POST-CAM mechanism) is provided in the artificial knee to simulate and replace the function of the posterior cruciate ligament. The posterior cruciate ligament provides the primary force of rollback during movement of the knee, while the POST-CAM mechanism effects rollback movement of the knee through compound movement of the POST and CAM.
In conventional product designs, the post and cam are both secured to the corresponding prosthetic component, the post is secured to the tibial insert, and the cam is secured to the femoral condyle prosthesis. When in motion, the upright post and the cam are in sliding friction, and the contact position is concentrated on a fixed area; over time, this region may easily wear out, resulting in a reduced lifetime of the artificial knee prosthesis.
In order to prolong the service life of the artificial knee joint prosthesis and reduce the abrasion of the contact part of the upright post and the cam to the greatest extent, a friction pair formed by the upright post and the cam needs to be in a reasonable friction state for a long time.
Accordingly, the present application addresses the above-described problems by providing a new femoral condyle prosthesis and artificial knee joint that reduces wear at the contact location of the post with the cam.
Disclosure of Invention
The invention aims to provide a femoral condyle prosthesis to solve the technical problem that in the prior art, the contact part of an upright post and a cam is seriously worn.
The invention also aims to provide the artificial knee joint so as to solve the technical problem of serious abrasion of the contact part of the upright post and the cam in the prior art.
Based on the first object, the invention provides a femoral condyle prosthesis comprising a femoral condyle basic body and a cam;
the cam is arranged in the intercondylar box of the femoral condyle basic body and is rotatably connected with the intercondylar box.
The invention can be alternatively adopted, wherein the femoral condyle prosthesis comprises a connecting piece; the cam is provided with a cam through hole along the axial direction of the cam;
the connecting piece is inserted into the cam through hole, and two ends of the connecting piece are respectively connected with the intercondylar box.
The optional technical scheme of the invention is that the connecting piece is provided with at least two limit grooves, and the limit grooves are positioned in the intercondylar box;
each limiting groove is clamped with at least one limiting piece, and the cam is arranged between the two limiting grooves;
the intercondylar box is provided with an intercondylar box connecting hole connected with the connecting piece;
along the axial direction perpendicular to the cam, the maximum length of the limiting piece is greater than the maximum length of the cam through hole, and the maximum length of the limiting piece is greater than the maximum length of the intercondylar box connecting hole.
The optional technical scheme of the invention is that two ends of the connecting piece are respectively connected with the intercondylar box through connecting screws; the screw head of the connecting screw is positioned outside the intercondylar box;
the intercondylar box is provided with an intercondylar box connecting hole connected with the connecting piece;
the cross-sectional area of the screw head is larger than the cross-sectional area of the intercondylar box connecting hole along the axial direction perpendicular to the cam.
The optional technical scheme of the invention is that the cam is rotatably connected with the connecting piece, and the connecting piece is rotatably connected with the intercondylar box;
or the cam is rotatably connected with the connecting piece, and the connecting piece is fixedly connected with the intercondylar box;
or, the cam is fixedly connected with the connecting piece, and the connecting piece is rotatably connected with the intercondylar box.
According to an alternative technical scheme, the intercondylar box and/or the cam are/is connected with the connecting piece through a bearing.
The invention adopts the optional technical scheme that the material of the femoral condyle basic body is cobalt-chromium-molybdenum alloy, alumina-based ceramic or zirconia-based ceramic;
the cam is made of cobalt-chromium-molybdenum alloy, alumina-based ceramic or zirconia-based ceramic;
the connecting piece is made of cobalt-chromium-molybdenum alloy, titanium alloy or stainless steel.
The optional technical scheme of the invention is that the clearance between the cam and the intercondylar box is 0.2mm-1mm;
the clearance between the cam and the connecting piece is 0.05mm-0.2mm;
the surface roughness of the cam is less than or equal to Ra0.1;
the surface roughness of the connecting piece is less than or equal to Ra0.1.
The alternative technical scheme of the invention is that the cam is a revolving body;
alternatively, the cam is a non-rotating body, and the outer surface of the non-rotating body includes a surface of revolution that is proximate the center of the intercondylar box.
Based on the second object, the artificial knee joint provided by the invention comprises the femoral condyle prosthesis.
The invention has the beneficial effects that:
the femoral condyle prosthesis comprises a femoral condyle basic body and a cam, wherein the cam is rotatably connected with an intercondylar box of the femoral condyle basic body through the cam, so that the cam can roll relative to the femoral condyle basic body when a stand column and the cam perform contact movement, friction between the stand column and the cam can be changed from sliding friction to rolling friction, abrasion of a contact part between the stand column and the cam can be reduced to a certain extent, the service lives of the stand column and the cam are prolonged, and the service life of the artificial knee joint prosthesis with the stand column and the cam is prolonged.
The artificial knee joint provided by the invention can change the friction between the upright post of the tibial gasket and the cam of the femoral condyle prosthesis from sliding friction to rolling friction, so that the abrasion of the contact part of the upright post and the cam can be reduced to a certain extent, the service life of the upright post and the cam is prolonged, and the service life of the artificial knee joint prosthesis with the upright post and the cam is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present 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, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a first angular configuration of a femoral condyle prosthesis provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a second angular configuration of a femoral condyle prosthesis provided in accordance with one embodiment of the present invention;
FIG. 3 is a left side view of the femoral condyle prosthesis shown in FIG. 2;
FIG. 4 is a top view of the femoral condyle prosthesis shown in FIG. 2;
FIG. 5 is an exploded view of a femoral condyle prosthesis provided in accordance with one embodiment of the present invention;
FIG. 6 is an exploded view of a cam and connector according to a first embodiment of the present invention;
FIG. 7 is a schematic view of a cam according to a first embodiment of the present invention;
FIG. 8 is a schematic view illustrating a first angle structure of another cam according to the first embodiment of the present invention;
FIG. 9 is a schematic view of a second angle structure of another cam according to the first embodiment of the present invention;
FIG. 10 is a schematic view of a femoral condyle prosthesis and tibial insert in accordance with a second embodiment of the present invention;
fig. 11 is an exploded view of a femoral condyle prosthesis and a tibial insert in accordance with a second embodiment of the present invention.
Icon: 100-femoral condyle prosthesis; 110-femoral condyle basic body; 111-intercondylar box; 120-cam; 121-cam through holes; 130-a connector; 131-a limit groove; 140-limiting pieces; 200-tibial insert; 210-upright post.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention 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 present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; 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 above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1-9, the present embodiment provides a femoral condyle prosthesis; FIG. 1 is a perspective view of a femoral condyle prosthesis provided in this embodiment; FIG. 2 is a front view of the femoral condyle prosthesis provided in this embodiment; FIG. 3 is a left side view of the femoral condyle prosthesis shown in FIG. 2; FIG. 4 is a top view of the femoral condyle prosthesis shown in FIG. 2; FIG. 5 is an exploded view of the femoral condyle prosthesis provided in this embodiment; for a clearer illustration of the structure of the cam and the connecting member, fig. 6 is an exploded view of the cam and the connecting member; fig. 7 to 9 are schematic structural views of a cam, wherein the cam shown in fig. 7 is a revolution body, and the cams shown in fig. 8 and 9 are non-revolution bodies.
Referring to fig. 1-9, the femoral condyle prosthesis provided in this embodiment is applied to an artificial knee joint, and includes a femoral condyle base body 110 and a cam 120.
The cam 120 is disposed within the intercondylar box 111 of the femoral condyle base 110, and the cam 120 is rotatably coupled to the intercondylar box 111. Optionally, the femoral condyle base 110 includes an anterior condyle, an intercondylar box 111, and two posterior condyles; the intercondylar box 111 connects the two posterior condyles.
The femoral condyle prosthesis in this embodiment includes a femoral condyle base body 110 and a cam 120, and is rotatably connected with an intercondylar box 111 of the femoral condyle base body 110 through the cam 120, so that the cam 120 can roll relative to the femoral condyle base body 110 when the upright post and the cam 120 perform contact motion, and friction between the upright post and the cam 120 can be changed from sliding friction to rolling friction, so that abrasion of a contact part between the upright post and the cam 120 can be reduced to a certain extent, the service life of the upright post and the cam 120 is prolonged, and further the service life of the artificial knee joint prosthesis with the upright post and the cam 120 is prolonged.
In the prior art, the upright post is usually made of polyethylene material, and is easy to wear under the condition that the upright post and the cam 120 are in sliding friction for a long time, so that the service life of the artificial knee joint prosthesis is reduced. The femoral condyle prosthesis creatively designs the cam 120 to be movable in the embodiment, reduces the abrasion of the contact part between the upright post and the cam 120 by changing the friction mode between the upright post and the cam 120, and prolongs the service life of the upright post and the cam 120.
In an alternative to this embodiment, the femoral condyle prosthesis includes a connector 130; the cam 120 is provided with a cam through hole 121 in its own axial direction; optionally, the axis of the cam through hole 121 coincides with the axis of the cam 120, so as to facilitate the rotation of the cam 120 about its own axis, facilitating the rolling between the upright and the cam 120.
The connecting member 130 is inserted into the cam through hole 121, and both ends of the connecting member 130 are respectively connected with the intercondylar box 111. I.e., the cam 120 is rotatably coupled to the intercondylar box 111 by a coupling 130. The cam 120 is conveniently mounted within the intercondylar box 111 by the connector 130 to simplify the construction of the femoral condyle prosthesis.
The cam 120 is rotatably connected with the intercondylar box 111 through the connecting piece 130, for example, the cam 120 is rotatably connected with the connecting piece 130, and the connecting piece 130 is rotatably connected with the intercondylar box 111;
alternatively, the cam 120 is rotatably connected with the connecting piece 130, and the connecting piece 130 is fixedly connected with the intercondylar box 111;
alternatively, the cam 120 is fixedly coupled to the connector 130, and the connector 130 is rotatably coupled to the intercondylar box 111.
Referring to fig. 6, in an alternative of the present embodiment, the connecting member 130 is provided with at least two limiting grooves 131, and the limiting grooves 131 are located in the intercondylar box 111.
At least one limiting piece 140 is clamped on each limiting groove 131, and a cam 120 is arranged between the two limiting grooves 131; the stopper 140 may be, for example, a check ring, a stopper post, a stopper, or the like.
The intercondylar box 111 is provided with an intercondylar box coupling hole coupled with the coupling member 130.
The maximum length of the limiting piece 140 is greater than the maximum length of the cam through hole 121 along the axial direction perpendicular to the cam 120, and the maximum length of the limiting piece 140 is greater than the maximum length of the intercondylar box connecting hole; such that the limiter 140 limits axial movement of the connector 130 relative to the intercondylar box 111 along the cam 120 to position the cam 120 within the intercondylar box 111.
Alternatively, the shape of the connecting member 130 may be a cylinder, a prism, or other shapes, and the shape of the connecting member 130 may be a special shape. Alternatively, the shape of the cam through hole 121 corresponds to the shape of the connection member 130; if the connecting piece 130 is a cylinder, the cam through hole 121 is also a cylinder with corresponding size, and if the connecting piece 130 is a rectangular cylinder, the cam through hole 121 is also a rectangular cylinder with corresponding size. Alternatively, the shape of the intercondylar-box connection hole corresponds to the shape of the connection 130; if the connecting piece 130 is a cylinder, the intercondylar box connecting hole is also a cylinder with corresponding size, and if the connecting piece 130 is a rectangular cylinder, the intercondylar box connecting hole is also a rectangular cylinder with corresponding size.
Alternatively, the intercondylar box connecting hole is in a cylinder, a prism or other shapes, and the intercondylar box connecting hole can also be in a special shape.
Optionally, the connecting piece 130 is in a cylindrical shape, the cam through hole 121 is in a corresponding cylindrical shape, and the retainer 140 is a retainer ring; the sectional area of the stopper 140 is larger than the sectional area of the cam through hole 121, and the sectional area of the stopper 140 is larger than the sectional area of the intercondylar box connection hole; such that the limiter 140 limits axial movement of the connector 130 relative to the intercondylar box 111 along the cam 120 to position the cam 120 within the intercondylar box 111.
Optionally, the connection 130 is a stepped cylinder; the diameter of the portion of the connecting member 130 that mates with the cam through hole 121 is greater than the diameter of the portion of the connecting member 130 that mates with the intercondylar box connecting hole; wherein a bearing is provided between the connection member 130 and the intercondylar box connection hole.
In an alternative of this embodiment, both ends of the connecting member 130 are connected to the intercondylar box 111 by connecting screws, respectively; such that the connector 130 is fixed or rotatable relative to the intercondylar box 111.
The screw head of the connecting screw is located outside the intercondylar box 111.
The intercondylar box 111 is provided with an intercondylar box coupling hole coupled with the coupling member 130.
The cross-sectional area of the screw head is greater than the cross-sectional area of the intercondylar box connection hole in the axial direction perpendicular to the cam 120. The cam 120 is attached within the intercondylar box 111 by attachment screws.
In an alternative to this embodiment, the intercondylar box 111 and/or the cam 120 are coupled to the connector 130 by bearings. That is, the intercondylar box 111 and the connecting member 130 are connected through bearings, or the cam 120 and the connecting member 130 are connected through bearings, or the intercondylar box 111 and the cam 120 are connected with the connecting member 130 through bearings. The bearing reduces the resistance of the cam 120 to the rotation of the intercondylar box 111, thereby reducing the rolling friction resistance of the post and the cam 120.
In an alternative to this embodiment, the femoral condyle base 110 is made of cobalt chrome molybdenum alloy, alumina-based ceramic, or zirconia-based ceramic.
Optionally, the cam 120 is made of cobalt-chromium-molybdenum alloy, alumina-based ceramic or zirconia-based ceramic.
Optionally, the material of the connecting member 130 is cobalt-chromium-molybdenum alloy, titanium alloy or stainless steel.
In the alternative of this embodiment, the gap between the cam 120 and the intercondylar box 111 is 0.2mm-1mm; for example, the clearance between the cam 120 and the intercondylar box 111 is 0.2mm, 0.3mm, 0.45mm, 0.6mm, 0.85mm, 0.9mm, and so forth.
Alternatively, the clearance between the cam 120 and the link 130 is 0.05mm-0.2mm; for example, the clearance between the cam 120 and the link 130 is 0.05mm, 0.06mm, 0.08mm, 0.12mm, 0.16mm, 0.2mm, and so on.
Alternatively, the surface roughness of the cam 120 is equal to or less than Ra0.1; to reduce frictional resistance between the post and the cam 120.
Optionally, the surface roughness of the connecting member 130 is less than or equal to Ra0.1, so that the cam 120 can roll relative to the femoral condyle base 110 when the post is in contact with the cam 120.
Referring to fig. 7, in an alternative of the present embodiment, the cam 120 is a revolution body; i.e., cam 120 is a 360 deg. axisymmetric body of revolution.
Referring to fig. 8 and 9, in an alternative embodiment, the cam 120 is a non-revolving body, and the outer surface of the non-revolving body includes a revolution surface, and the revolution surface is near the center of the intercondylar box 111. That is, cam 120 is part of a revolution and part of a non-revolution. The rolling friction between the post and the cam 120 is enabled by the curved surface of revolution approaching the center of the intercondylar box 111.
Example two
A second embodiment provides an artificial knee joint, where the embodiment includes the femoral condyle prosthesis described in the first embodiment, and technical features of the femoral condyle prosthesis disclosed in the first embodiment are also applicable to the first embodiment, and technical features of the femoral condyle prosthesis disclosed in the first embodiment are not repeated.
Fig. 10 is a schematic structural view of the femoral condyle prosthesis and the tibial insert provided in this embodiment, and fig. 11 is an exploded schematic view of the femoral condyle prosthesis and the tibial insert.
Referring to fig. 10 and 11, in combination with fig. 1 to 9, the artificial knee joint according to the present embodiment includes a femoral condyle prosthesis 100, and further includes a tibial insert 200 and a post 210 disposed on the tibial insert 200. The femoral condyle prosthesis 100 comprises a femoral condyle basic body 110 and a cam 120, and is rotatably connected with the intercondylar box 111 of the femoral condyle basic body 110 through the cam 120, so that the cam 120 can roll relative to the femoral condyle basic body 110 when the upright post 210 and the cam 120 are in contact movement, friction between the upright post 210 and the cam 120 can be changed from sliding friction to rolling friction, and therefore abrasion of a contact part between the upright post 210 and the cam 120 can be reduced to a certain extent, and the service life of the artificial knee joint can be prolonged.
The artificial knee joint of the present embodiment has the advantages of the femoral condyle prosthesis 100 of the first embodiment, and the advantages of the femoral condyle prosthesis 100 of the first embodiment are not repeated here.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A femoral condyle prosthesis comprising a femoral condyle base body and a cam;
the cam is arranged in an intercondylar box of the femoral condyle basic body and is rotatably connected with the intercondylar box;
the femoral condyle prosthesis includes a connector; the cam is provided with a cam through hole along the axial direction of the cam;
the connecting piece is spliced with the cam through hole, and two ends of the connecting piece are respectively connected with the intercondylar box;
the connecting piece is provided with at least two limiting grooves, and the limiting grooves are positioned in the intercondylar box;
each limiting groove is clamped with at least one limiting piece, and the cam is arranged between the two limiting grooves;
the intercondylar box is provided with an intercondylar box connecting hole connected with the connecting piece;
along the axial direction perpendicular to the cam, the maximum length of the limiting piece is greater than the maximum length of the cam through hole, and the maximum length of the limiting piece is greater than the maximum length of the intercondylar box connecting hole.
2. The femoral condyle prosthesis of claim 1, wherein the two ends of the connector are connected to the intercondylar box by connecting screws, respectively; the screw head of the connecting screw is positioned outside the intercondylar box;
the intercondylar box is provided with an intercondylar box connecting hole connected with the connecting piece;
the cross-sectional area of the screw head is larger than the cross-sectional area of the intercondylar box connecting hole along the axial direction perpendicular to the cam.
3. The femoral condyle prosthesis of claim 1, wherein the cam is rotatably connected to the connector, the connector being rotatably connected to the intercondylar box;
or the cam is rotatably connected with the connecting piece, and the connecting piece is fixedly connected with the intercondylar box;
or, the cam is fixedly connected with the connecting piece, and the connecting piece is rotatably connected with the intercondylar box.
4. The femoral condyle prosthesis of claim 1, wherein the intercondylar box and/or the cam are connected to the connector by bearings.
5. The femoral condyle prosthesis of claim 1, wherein the femoral condyle base is a cobalt chromium molybdenum alloy, an alumina-based ceramic, or a zirconia-based ceramic;
the cam is made of cobalt-chromium-molybdenum alloy, alumina-based ceramic or zirconia-based ceramic;
the connecting piece is made of cobalt-chromium-molybdenum alloy, titanium alloy or stainless steel.
6. The femoral condyle prosthesis of claim 1, wherein a gap between the cam and the intercondylar box is 0.2mm-1mm;
the clearance between the cam and the connecting piece is 0.05mm-0.2mm;
the surface roughness of the cam is less than or equal to Ra0.1;
the surface roughness of the connecting piece is less than or equal to Ra0.1.
7. The femoral condyle prosthesis of claim 1, wherein the cam is a solid of revolution;
alternatively, the cam is a non-rotating body, and the outer surface of the non-rotating body includes a surface of revolution that is proximate the center of the intercondylar box.
8. An artificial knee joint comprising the femoral condyle prosthesis of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710917497.7A CN107693166B (en) | 2017-09-30 | 2017-09-30 | Femoral condyle prosthesis and artificial knee joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710917497.7A CN107693166B (en) | 2017-09-30 | 2017-09-30 | Femoral condyle prosthesis and artificial knee joint |
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| CN107693166A CN107693166A (en) | 2018-02-16 |
| CN107693166B true CN107693166B (en) | 2024-01-12 |
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| CN201710917497.7A Active CN107693166B (en) | 2017-09-30 | 2017-09-30 | Femoral condyle prosthesis and artificial knee joint |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN205626207U (en) * | 2016-03-07 | 2016-10-12 | 天津妙娅生物科技有限公司 | Knee joint |
| CN209529403U (en) * | 2017-09-30 | 2019-10-25 | 北京安颂科技有限公司 | Lateral femoral condyle prosthesis and artificial knee joint |
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| CN101214175A (en) * | 2008-01-17 | 2008-07-09 | 四川大学 | Knee joint endoprosthesis |
| CN104125818A (en) * | 2012-02-17 | 2014-10-29 | 株式会社科麟泰 | Artificial knee joint |
| TWM447230U (en) * | 2012-06-15 | 2013-02-21 | Univ Nat Taiwan Ocean | Walking aid apparatus |
| CN202724044U (en) * | 2012-08-18 | 2013-02-13 | 深圳清华大学研究院 | Knee prosthesis |
| CN103752000A (en) * | 2014-01-23 | 2014-04-30 | 山东科技大学 | Double-plate skiing training device |
| CN203852451U (en) * | 2014-05-23 | 2014-10-01 | 北京威高亚华人工关节开发有限公司 | Rotary-platform type knee joint prosthesis |
| CN205434036U (en) * | 2015-12-25 | 2016-08-10 | 孙雁群 | Joint device and have its reduction of students' study load lotus knee -pad brace |
| CN205626207U (en) * | 2016-03-07 | 2016-10-12 | 天津妙娅生物科技有限公司 | Knee joint |
| CN209529403U (en) * | 2017-09-30 | 2019-10-25 | 北京安颂科技有限公司 | Lateral femoral condyle prosthesis and artificial knee joint |
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| CN107693166A (en) | 2018-02-16 |
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