CN117503435B - Knee joint prosthesis assembly - Google Patents
Knee joint prosthesis assembly Download PDFInfo
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- CN117503435B CN117503435B CN202410023862.XA CN202410023862A CN117503435B CN 117503435 B CN117503435 B CN 117503435B CN 202410023862 A CN202410023862 A CN 202410023862A CN 117503435 B CN117503435 B CN 117503435B
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- China
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- condyle
- joint component
- patellofemoral joint
- connecting rod
- patellofemoral
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- 210000000629 knee joint Anatomy 0.000 title claims abstract description 63
- 210000004285 patellofemoral joint Anatomy 0.000 claims abstract description 112
- 210000000689 upper leg Anatomy 0.000 claims abstract description 29
- 210000004417 patella Anatomy 0.000 claims abstract description 26
- 210000003127 knee Anatomy 0.000 claims abstract description 19
- 210000002303 tibia Anatomy 0.000 claims description 12
- 230000013011 mating Effects 0.000 claims 2
- 125000006850 spacer group Chemical group 0.000 description 7
- 210000000988 bone and bone Anatomy 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 3
- 206010057178 Osteoarthropathies Diseases 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 208000006820 Arthralgia Diseases 0.000 description 1
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 1
- 208000003947 Knee Osteoarthritis Diseases 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 208000002193 Pain Diseases 0.000 description 1
- MTHLBYMFGWSRME-UHFFFAOYSA-N [Cr].[Co].[Mo] Chemical compound [Cr].[Co].[Mo] MTHLBYMFGWSRME-UHFFFAOYSA-N 0.000 description 1
- 230000003872 anastomosis Effects 0.000 description 1
- 238000011882 arthroplasty Methods 0.000 description 1
- 239000002639 bone cement Substances 0.000 description 1
- 239000010952 cobalt-chrome Substances 0.000 description 1
- 230000003412 degenerative effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008407 joint function Effects 0.000 description 1
- 238000013150 knee replacement Methods 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 201000008482 osteoarthritis Diseases 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 210000003781 tooth socket 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
- A61F2/38—Joints for elbows or knees
- A61F2/3836—Special connection between upper and lower leg, e.g. constrained
-
- 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
- A61F2/3877—Patellae or trochleae
-
- 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
- A61F2/3877—Patellae or trochleae
- A61F2002/3881—Patellae or trochleae with moving parts
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 present application provides a knee prosthesis assembly comprising: the inner condyle is provided with a first connecting part connected with the femur of the human body; the external condyle is provided with a second connecting part connected with the femur of the human body, and the internal condyle and the external condyle are arranged at intervals; the patellofemoral joint component comprises a patellofemoral joint component, wherein a first end of a medial condyle and a first end of a lateral condyle are both detachably arranged on the patellofemoral joint component, and a second end of the medial condyle and a second end of the lateral condyle both extend towards a direction away from the patellofemoral joint component; an adjustment structure disposed between the first end of the medial condyle and the patellofemoral joint component and/or the adjustment structure disposed between the first end of the lateral condyle and the patellofemoral joint component. According to the technical scheme provided by the application, the problems that the knee joint prosthesis component in the related technology cannot be subjected to position adjustment according to the human body structure, so that the patella track is poor after the knee joint is replaced, and the human knee joint is weak in movement, so that the movement function is poor can be solved.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a knee joint prosthesis component.
Background
Knee joints are important weight-bearing joints of lower limbs, and their structure and function are the most complex of human joints. Knee degenerative osteoarthropathy is a common disease in elderly people, with 35% of symptomatic knee osteoarthropathy men reported to occur over 50 years of age, and up to 74% in women. Serious knee osteoarthritis is increasingly in patients who require artificial knee arthroplasty. Knee replacement is the use of knee prostheses to replace diseased knee bone tissue, alleviating or relieving pain in patients, restoring and reconstructing the function of a natural knee. Knee joint replacement can relieve knee joint pain, improve knee joint function, correct knee joint deformity and achieve long-term stability.
The largest pulley joint in the human body is a patella and a patellofemoral joint component, when the femur pulley and the patella move in a matched mode, the patella can slide on the patellofemoral joint component, and along with the bending and stretching of the knee joint, the patella can be positioned at different positions on the femur pulley, so that normal bending and stretching activities and functional training of the knee joint can be matched.
In the related art, the knee joint prosthesis component is implanted into a human body by utilizing knee joint replacement, so that after the femoral condyle in the human body is damaged, the knee joint prosthesis component is utilized for replacement, and the damage to the knee joint position is ensured to be treated.
However, in the knee joint prosthesis component in the related art, the patellofemoral joint component and the femoral condyle are of an integrated structure, the position of the knee joint prosthesis component cannot be adjusted according to the human body structure, so that the patella track is poor after the knee joint is replaced, the human knee joint is weak in movement, the movement function is poor, and the daily use of the human body cannot be met after long-term use.
Disclosure of Invention
The invention provides a knee joint prosthesis component, which aims to solve the problems that the knee joint prosthesis component in the related art cannot adjust the position of the knee joint prosthesis component according to the human body structure, so that the knee joint is replaced, the track of the patella is poor, the movement of the human knee joint is weak, and the movement function is poor.
The present invention provides a knee prosthesis assembly, the knee prosthesis assembly comprising: the inner condyle is provided with a first connecting part connected with the femur of the human body; the external condyle is provided with a second connecting part connected with the femur of the human body, and the internal condyle and the external condyle are arranged at intervals; the patellofemoral joint component comprises a patellofemoral joint component, wherein a first end of a medial condyle and a first end of a lateral condyle are both detachably arranged on the patellofemoral joint component, and a second end of the medial condyle and a second end of the lateral condyle both extend towards a direction away from the patellofemoral joint component; an adjustment structure disposed between the first end of the medial condyle and the patellofemoral joint component and/or between the first end of the lateral condyle and the patellofemoral joint component to rotate the patellofemoral joint component relative to the medial condyle and the lateral condyle; a patella prosthesis in sliding engagement with the patellofemoral joint component; the tibia gasket comprises a first gasket matched with the medial condyle and a second gasket matched with the lateral condyle, and the first gasket and the second gasket are connected with the tibia of a human body.
Further, the adjusting structure includes: a first adjustment slot disposed on the patellofemoral joint component; a second adjustment slot disposed on the patellofemoral joint component; the first end of the first connecting rod is connected with the inner condyle, and the first connecting rod is arranged in the first adjusting groove; the first end of the second connecting rod is connected with the external condyle, and the second connecting rod is arranged in the second adjusting groove; the second end of the first connecting rod is provided with a plurality of first teeth, the second end of the second connecting rod is provided with a plurality of second teeth, and the patellofemoral joint component is provided with a plurality of tooth grooves meshed with the first teeth and the second teeth.
Further, the adjusting structure further includes: the second end of the first connecting rod is connected with the first gear; the second end of the second connecting rod is connected with the second gear, and the first gear and the second gear are arranged in the tooth slot; adjusting gaps are arranged between the first connecting rod and the first adjusting groove and between the second connecting rod and the second adjusting groove.
Further, a first positioning column is arranged on the tooth groove, and positioning holes for avoiding the first positioning column are formed in the first gear and the second gear.
Further, the first reference column includes first post section and second post section, and the one end of first post section is connected with the one end of second post section, and the other end of first post section is connected with patellofemoral joint part, and the other end orientation of second post section is kept away from the orientation of patellofemoral joint part and is extended, and the cross-sectional dimension of first post section is in the direction from top to bottom increase gradually, and the lateral wall of second post section is provided with the helicitic texture.
Further, the first connecting portion comprises a second positioning column, the second connecting portion comprises a third positioning column, the first end of the second positioning column is connected with the upper surface of the inner condyle, the second end of the second positioning column extends towards the direction away from the inner condyle, the first end of the third positioning column is connected with the upper surface of the outer condyle, the second end of the third positioning column extends towards the direction away from the inner condyle, and an included angle exists between the first positioning column and the second positioning column as well as between the second positioning column and the third positioning column.
Further, fourth positioning columns are arranged on the surfaces of the patellofemoral joint component, which face the medial condyle and the lateral condyle, the fourth positioning columns are arranged in parallel with the first positioning columns, and deformation openings extending to the top ends of the fourth positioning columns are arranged on the fourth positioning columns.
Further, the clockwise rotation angle of the patellofemoral joint component is set between 5 ° and 10 °; and/or the counterclockwise rotation angle of the patellofemoral joint component is set between 5 ° and 10 °.
Further, a first gasket is arranged between the inner condyle and the tibia of the human body, and the ratio of the curvature of the inner condyle to the curvature of the first gasket is between 0.8 and 1; and/or a second gasket is arranged between the external condyle and the tibia of the human body, and the ratio of the curvature of the external condyle to the curvature of the second gasket is between 0.4 and 0.7.
Further, an arc-shaped pulley surface is arranged at a position, close to the patella prosthesis, of the patella femoral joint component, the patella prosthesis is provided with an arc-shaped protruding part matched with the arc-shaped pulley surface, and the arc-shaped protruding part is slidably arranged on the arc-shaped pulley surface; the plane where the tangent line of the bottom of the arcuate scooter surface is located is parallel to the center plane between the medial and lateral condyles, and an included angle exists between the plane where the tangent line of the top of the arcuate scooter surface is located and the center plane between the medial and lateral condyles.
By applying the technical scheme of the invention, the knee joint prosthesis component comprises a medial condyle, a lateral condyle, a patellofemoral joint component and an adjusting structure, wherein the medial condyle is connected with a human femur through a first connecting part, the lateral condyle is connected with the human femur through a second connecting part, the medial condyle and the lateral condyle are arranged at intervals, and the first end of the medial condyle and the first end of the lateral condyle are both detachably arranged on the patellofemoral joint component. In order to be convenient for the patellofemoral joint component can carry out position adjustment relative to the internal condyle and the external condyle, the problem of damage to the knee joint prosthesis component after the knee joint is replaced is avoided, an adjusting structure is arranged between the first end of the internal condyle and/or the first end of the external condyle and the patellofemoral joint component, and then the patellofemoral joint component can rotate relative to the internal condyle and the external condyle, so that the knee joint prosthesis component can carry out position adjustment when being implanted into a human body, different human bodies are adapted, and the knee joint prosthesis component is ensured to be used for a long time. Wherein, in order to be convenient for guarantee that patellofemoral joint part carries out sliding fit with the patellar prosthesis, through setting up the tibia gasket, the first gasket of tibia gasket cooperatees with the interior condyle, the second gasket cooperatees with the external condyle, make interior condyle and external condyle slide respectively on first gasket and second gasket, make under the condition that interior condyle and external condyle match human femur, select first gasket and second gasket, make first gasket and second gasket all be connected with human tibia, make interior condyle and external condyle slide on the tibia gasket, and then satisfy human activity demand after the implantation of knee joint prosthetic components, promote the adaptability between knee joint prosthetic components and the human body, can also further promote the structural reliability and the practicality of knee joint prosthetic components.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 illustrates a schematic structural view of a knee prosthesis assembly provided in accordance with an embodiment of the present invention;
FIG. 2 illustrates a schematic structural view of another view of a knee prosthesis assembly provided in accordance with an embodiment of the present invention;
FIG. 3 illustrates an elevation view of a knee prosthesis assembly provided in accordance with an embodiment of the present invention;
Fig. 4 illustrates a posterior view of the patellofemoral joint component of a knee joint prosthesis assembly provided according to embodiments of the present invention.
Wherein the above figures include the following reference numerals:
10. medial condyle; 11. a first connection portion; 111. a second positioning column;
20. A lateral condyle; 21. a second connecting portion; 211. third positioning column
30. A patellofemoral joint component; 31. tooth slots; 32. a first positioning column; 321. a first column section; 322. a second column section; 33. a fourth positioning column; 34. an arcuate scooter surface;
40. an adjustment structure; 41. a first adjustment tank; 42. a second regulating groove; 43. a first connecting rod; 431. a first tooth; 44. a second connecting rod;
50. A tibial insert; 51. a first gasket; 52. a second gasket;
60. a patella prosthesis; 61. an arc-shaped protruding part.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. 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.
As shown in fig. 1 to 4, the embodiment of the present invention provides a knee joint prosthesis assembly, which includes a medial condyle 10, a lateral condyle 20, a patellofemoral joint component 30, an adjusting structure 40, a patellar prosthesis 60, and a tibial insert 50, wherein the medial condyle 10 has a first connecting portion 11 connected with a femur of a human body, the lateral condyle 20 has a second connecting portion 21 connected with the femur of the human body, the medial condyle 10 and the lateral condyle 20 are disposed at a distance, the first end of the medial condyle 10 and the first end of the lateral condyle 20 are both detachably disposed on the patellofemoral joint component 30, the second end of the medial condyle 10 and the second end of the lateral condyle 20 are both extended in a direction away from the patellofemoral joint component 30, the adjusting structure 40 is disposed between the first end of the medial condyle 10 and the patellofemoral joint component 30, and/or the adjusting structure 40 is disposed between the first end of the lateral condyle 20 and the patellofemoral joint component 30, such that the medial condyle 20 rotates relative to the lateral condyle 20 and the lateral condyle 20, the patellofemoral prosthesis 60 is in sliding fit with the patellofemoral joint component 30, and the patellofemoral joint component 50 includes a second end 52 and a first tibial insert 52, and a second insert 52, which is connected with the first and the tibial insert 52.
The knee joint prosthesis component provided by the embodiment is applied, and comprises a medial condyle 10, a lateral condyle 20, a patellofemoral joint component 30 and an adjusting structure 40, wherein the medial condyle 10 is connected with a human femur through a first connecting part 11, the lateral condyle 20 is connected with the human femur through a second connecting part 21, the medial condyle 10 and the lateral condyle 20 are arranged at intervals, and a first end of the medial condyle 10 and a first end of the lateral condyle 20 are both detachably arranged on the patellofemoral joint component 30. In order to facilitate the position adjustment of the patellofemoral joint component 30 relative to the medial condyle 10 and the lateral condyle 20, the problem of damage to the knee joint prosthesis component after the knee joint is replaced is avoided, and an adjusting structure 40 is arranged between the first end of the medial condyle 10 and/or the first end of the lateral condyle 20 and the patellofemoral joint component 30, so that the patellofemoral joint component 30 can rotate relative to the medial condyle 10 and the lateral condyle 20, and the position adjustment of the knee joint prosthesis component can be performed when the knee joint prosthesis component is implanted into a human body, so that the knee joint prosthesis component is adapted to different human bodies, and long-term use of the knee joint prosthesis component is ensured. Wherein, in order to be convenient for guarantee that patellofemoral joint component 30 carries out sliding fit with patellar prosthesis 60, through setting up tibial insert 50, the first gasket 51 of tibial insert 50 cooperatees with the medial condyle 10, the second gasket 52 cooperatees with the lateral condyle 20, make medial condyle 10 and lateral condyle 20 slide respectively on first gasket 51 and second gasket 52, make under the condition that medial condyle 10 and lateral condyle 20 match the human femur, select first gasket 51 and second gasket 52, make first gasket 51 and second gasket 52 all be connected with the human tibia, make medial condyle 10 and lateral condyle 20 slide on tibial insert 50, and then satisfy human activity demand after the prosthetic knee component implants the human body, promote the adaptability between prosthetic knee component and the human body, can also further promote the structural reliability and the practicality of prosthetic knee component.
It should be noted that, the part or all of the structure of the knee joint prosthesis assembly provided in this embodiment can be implanted into a human body, specifically, one or more of the medial condyle 10, the lateral condyle 20, the patellofemoral joint component 30, the patellofemoral prosthesis 60, and the tibial insert 50 are implanted into a human body, so that the damaged position in the femoral condyle can be replaced, and other intact bone is not replaced, so that the bone is kept as much as possible.
The medial condyle 10 and the lateral condyle 20 with proper sizes are selected to match bones with different sizes of human bodies, and the tibial gasket 50 with proper sizes is selected, so that the medial condyle 10 is matched with the first gasket 51, the lateral condyle 20 is matched with the second gasket 52, and both the medial condyle 10 and the lateral condyle 20 can slide on the tibial gasket 50. The adjusting structure is arranged on the patellofemoral joint component 30, so that the patellofemoral joint component 30 can rotate, the patellofemoral joint component 30 can be matched with the patellofemoral joint component 60 better, the patellofemoral joint component 30 is guaranteed to be in sliding fit with a human body, the knee joint prosthesis component is guaranteed to be capable of selecting the inner condyle 10, the outer condyle 20 and the tibial gasket 50 according to the size of bone of the human body, the adjusting structure 40 is utilized to guarantee that the patellofemoral joint component 60 can be in sliding fit with the patellofemoral joint component, and the practicability of the knee joint prosthesis component is improved.
As shown in fig. 3, an avoidance gap is formed outside the external condyle 20, the avoidance gap extends from the outer side wall of the external condyle 20 towards the direction close to the internal condyle 10, the maximum projection size of the avoidance gap on the horizontal plane is set between 5mm and 10mm, and the maximum projection size of the avoidance gap on the sagittal plane is set between 10mm and 25 mm.
The maximum projection size of the avoidance gap on the horizontal plane may be any of 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and 5mm to 10 mm.
The maximum projection size of the relief notch on the sagittal plane may be any of 10mm, 13mm, 16mm, 19mm, 22mm, 25mm, and 10mm to 25 mm.
As shown in fig. 1, the adjusting structure 40 includes a first adjusting slot 41, a second adjusting slot 42, a first connecting rod 43 and a second connecting rod 44, the first adjusting slot 41 is disposed on the patellofemoral joint component 30, the second adjusting slot 42 is disposed on the patellofemoral joint component 30, a first end of the first connecting rod 43 is connected with the medial condyle 10, the first connecting rod 43 is disposed in the first adjusting slot 41, a first end of the second connecting rod 44 is connected with the lateral condyle 20, the second connecting rod 44 is disposed in the second adjusting slot 42, wherein a plurality of first teeth 431 are disposed at a second end of the first connecting rod 43, a plurality of second teeth are disposed at a second end of the second connecting rod 44, and a plurality of tooth slots 31 meshed with the first teeth 431 and the second teeth are disposed on the patellofemoral joint component 30. With the above structure, by providing the first adjusting groove 41, the second adjusting groove 42, the first connecting rod 43 and the second connecting rod 44, the first end of the first connecting rod 43 is connected with the medial condyle 10, the second end of the first connecting rod 43 is provided with the plurality of first teeth 431, the first connecting rod 43 is disposed in the first adjusting groove 41, the first teeth 431 are meshed with the teeth grooves 31, when the patellofemoral joint component 30 needs to rotate relative to the medial condyle 10 and the lateral condyle 20, the teeth grooves 31 in the patellofemoral joint component 30 are meshed with the first teeth 431 after rotating by a certain angle by rotating the patellofemoral joint component 30, and the first connecting rod 43 can rotate in the first adjusting groove 41, so that the patellofemoral joint component 30 can rotate relative to the medial condyle 10 and the lateral condyle 20. Wherein, in order to guarantee the structural reliability of the rotation of the patellofemoral joint component 30, the first end of the second connecting rod 44 is connected with the lateral condyle 20, the second end of the second connecting rod 44 is provided with a second tooth meshed with the tooth socket 31, and the second connecting rod 44 is arranged in the second adjusting groove 42, so that the patellofemoral joint component 30 can rotate relative to the medial condyle 10 and the lateral condyle 20 at the same time when rotating, thereby improving the structural reliability of the patellofemoral joint component 30.
As shown in fig. 1, the adjusting structure 40 further includes a first gear and a second gear, a second end of the first connecting rod 43 is connected with the first gear, a second end of the second connecting rod 44 is connected with the second gear, the first gear and the second gear are both disposed in the tooth slot 31, and adjusting gaps are disposed between the first connecting rod 43 and the first adjusting slot 41 and between the second connecting rod 44 and the second adjusting slot 42. With the above structure, by providing the first gear and the second gear, the first gear and the second gear are conveniently stacked in the tooth slot 31, and the adjustment gaps between the first connecting rod 43 and the first adjustment slot 41 and between the second connecting rod 44 and the second adjustment slot 42 are utilized, so that the first connecting rod 43 and the second connecting rod 44 can conveniently rotate relative to the patellofemoral joint component 30.
In this embodiment, the first gear and the second gear have the same structure, so that the first gear and the second gear can be stacked in the tooth slot 31.
As shown in fig. 1, the tooth slot 31 is provided with a first positioning column 32, and the first gear and the second gear are respectively provided with a positioning hole avoiding the first positioning column 32. By adopting the structure, the first positioning column 32 is arranged, and the first positioning column 32 is arranged in the positioning holes on the first gear and the second gear in a penetrating way, so that the positioning and the installation of the first gear and the second gear are conveniently realized.
As shown in fig. 1 and 2, the first positioning post 32 includes a first post section 321 and a second post section 322, one end of the first post section 321 is connected with one end of the second post section 322, the other end of the first post section 321 is connected with the patellofemoral joint component 30, the other end of the second post section 322 extends toward a direction away from the patellofemoral joint component 30, the cross-sectional dimension of the first post section 321 increases gradually in a top-to-bottom direction, and the outer side wall of the second post section 322 is provided with a screw structure. By adopting the structure, the first post section 321 can be stretched into the femur of the human body, so that the positioning and mounting functions are conveniently achieved, the first post section 321 is connected with the second post section 322, the friction increasing functions can be achieved through the threaded structure on the outer side wall of the second post section 322, the first positioning post 32 can be positioned with the femur of the human body, and the patellofemoral joint component 30 is prevented from being separated from the femur of the human body.
As shown in fig. 2, the first connection part 11 includes a second positioning post 111, the second connection part 21 includes a third positioning post 211, a first end of the second positioning post 111 is connected to an upper surface of the medial condyle 10, a second end of the second positioning post 111 extends in a direction away from the medial condyle 10, a first end of the third positioning post 211 is connected to an upper surface of the lateral condyle 20, a second end of the third positioning post 211 extends in a direction away from the medial condyle 10, and an included angle exists between the first positioning post 32 and the second and third positioning posts 111 and 211. By adopting the structure, the inner condyle 10 and the outer condyle 20 are conveniently positioned and connected with the femur of the human body by arranging the second positioning column 111 and the third positioning column 211, an included angle is formed between the first positioning column 32 and the second positioning column 111 and the third positioning column 211, and when the first positioning column 32 is stressed, an included angle is formed between the second positioning column 111 and the third positioning column 211 and the first positioning column 32 respectively, so that the prosthetic component of the knee joint can be prevented from falling off due to stress, the prosthetic component of the knee joint can be ensured to be used for a long time, and the service life of the prosthetic component of the knee joint is prolonged.
As shown in fig. 1 and 2, fourth positioning posts 33 are provided on the surfaces of the patellofemoral joint component 30 facing the medial and lateral condyles 10, 20, the fourth positioning posts 33 being disposed parallel to the first positioning posts 32, the fourth positioning posts 33 being provided with deformation openings extending to the tips thereof. By adopting the structure, the patellofemoral joint component 30 and the human femur can be conveniently connected by arranging the fourth positioning column 33, the fourth positioning column 33 stretches into the human femur through the deformation opening and is in interference fit with the human femur, and the patellofemoral joint component 30 and the human femur are ensured to be firmly connected.
The deformation opening on the fourth positioning post 33 can also be used to fix the patellofemoral joint component 30 to the femur of a human body by injecting bone cement.
Wherein, the external condyle 20 includes connecting gradually first connecting portion, second connecting portion and third connecting portion, first connecting portion sets up at the first end of external condyle 20 and is connected with patellofemoral joint component 30 through the head rod, third connecting portion sets up the second end at external condyle 20, the second connecting portion sets up between first connecting portion and third connecting portion, third positioning column 211 sets up on the second connecting portion, there is the contained angle between the upper surface of first connecting portion and the upper surface of second connecting portion, so that all be provided with the contained angle between first positioning column 32 and second positioning column 111 and the third positioning column 211, avoid knee joint prosthetic components to drop at the atress causing the prosthesis like this. And the included angle between the upper surface of the first connecting part and the upper surface of the second connecting part is 45 degrees.
Specifically, the fourth positioning post 33 on the patellofemoral joint component 30 is disposed parallel to the first positioning post 32, which can facilitate the connection between the patellofemoral joint component 30 and the femur of the human body.
In the present embodiment, the clockwise rotation angle of the patellofemoral joint component 30 is set between 5 ° and 10 °. Through setting the clockwise rotation angle of the patellofemoral joint component 30 within the above range, the position of the patellofemoral joint component 30 can be conveniently adjusted in the clockwise direction, so that the patellofemoral joint component 30 can be matched with the patella of a human body, and the normal activity requirement of the human body is met.
It should be noted that the clockwise rotation angle of the patellofemoral joint component 30 may be set to any of 5 °, 7 °, 9 °, 10 °, and 5 ° to 10 °.
In the present embodiment, the counterclockwise rotation angle of the patellofemoral joint component 30 is set between 5 ° and 10 °. By setting the counterclockwise rotation angle of the patellofemoral joint component 30 within the above range, the position of the patellofemoral joint component 30 can be conveniently adjusted in the counterclockwise direction, so that the patellofemoral joint component 30 can be matched with the patella of a human body, and the normal activity requirement of the human body is met.
It should be noted that the counterclockwise rotation angle of the patellofemoral joint component 30 may be set to any of 5 °, 7 °, 9 °, 10 °, and 5 ° to 10 °.
As shown in fig. 1, a first shim 51 is provided between the medial condyle 10 and the tibia of the human body, and the ratio of the curvature of the medial condyle 10 to the curvature of the first shim 51 is set between 0.8 and 1. By adopting the structure, the ratio of the curvature of the medial condyle 10 to the curvature of the first gasket 51 is set in the range, when the knee joint prosthesis component is implanted into a human body, the medial condyle 10 with the proper size is selected to be matched with the femur of the human body, the first gasket 51 with the proper size is selected according to the ratio of the curvature of the medial condyle 10 to the curvature of the first gasket 51, and then the medial condyle 10 can be in sliding fit on the first gasket 51 after the medial condyle 10 and the first gasket 51 are implanted into the human body.
It should be noted that the ratio of the curvature of the medial condyle 10 to the curvature of the first spacer 51 may be set to any one of 0.8, 0.9, 1, and 0.8 to 1.
As shown in fig. 1, a second shim 52 is provided between the lateral condyle 20 and the tibia of the human body, and the ratio of the curvature of the lateral condyle 20 to the curvature of the second shim 52 is set between 0.4 and 0.7. With the above structure, the ratio of the curvature of the external condyle 20 to the curvature of the second spacer 52 is set within the above range, when the knee prosthesis component is implanted into the human body, the external condyle 20 with a proper size is selected to match the femur of the human body, and the second spacer 52 with a proper size is selected according to the ratio of the curvature of the external condyle 20 to the curvature of the second spacer 52, so that after the external condyle 20 and the second spacer 52 are implanted into the human body, the external condyle 20 can be slidably matched on the second spacer 52.
It should be noted that the ratio of the curvature of the lateral condyle 20 to the curvature of the second spacer 52 may be set to any of 0.4, 0.5, 0.6, 0.7, and any other value between 0.4 and 0.7.
If the bone mass of the human body is large, the inner condyle 10 and the outer condyle 20 with large curvature radius are selected to be matched with the femur of the human body, and the first gasket 51 and the second gasket 52 in the ratio range are selected to ensure that the inner condyle 10 and the outer condyle 20 can move in cooperation with the human body, so that the ratio of the curvature of the inner condyle 10 to the curvature of the first gasket 51 and the ratio of the curvature of the outer condyle 20 to the curvature of the second gasket 52 are in a reasonable range, and the structural reliability and the practicability of the knee joint prosthesis assembly are improved.
As shown in fig. 2 and 4, the patellofemoral joint component 30 is provided with an arcuate sliding surface 34 adjacent to the patella prosthesis 60, the patella prosthesis 60 is provided with an arcuate projection 61 that mates with the arcuate sliding surface 34, and the arcuate projection 61 is slidably disposed on the arcuate sliding surface 34. With the above structure, the arc-shaped protruding portion 61 on the patella prosthesis 60 is slidably disposed on the arc-shaped slide surface 34 of the patellofemoral joint component 30, so that the patella prosthesis 60 can cooperate with the patellofemoral joint component 30 along with the movement of the human body, and the knee joint prosthesis assembly can meet the daily movement requirement.
It should be noted that, the arc-shaped sliding surface 34 on the patellofemoral joint component 30 extends inward toward the position near the medial condyle 10 and the lateral condyle 20, so as to form an arc-shaped groove with a certain depth, the curvature radius of the arc-shaped sliding surface 34 is set between 20mm and 40mm, the arc-shaped protruding portion 61 on the patella prosthesis 60 is also set to an arc-shaped structure, and the curvature radius of the arc-shaped protruding portion 61 is set between 20mm and 40 nmm.
The ratio between the curvature radius of the arc-shaped protruding portion 61 on the patella prosthesis 60 and the curvature radius of the arc-shaped sliding surface 34 on the patellofemoral joint component 30 is set between 0.8 and 1, so that the arc-shaped protruding portion 61 and the arc-shaped sliding surface 34 can be matched, the higher the ratio between the curvature radius of the arc-shaped protruding portion 61 on the patella prosthesis 60 and the curvature radius of the arc-shaped sliding surface 34 on the patellofemoral joint component 30 is, the more line-surface contact structure is formed, the higher the anastomosis rate is, and the larger the contact surface is, and the knee joint prosthesis component is more stable.
The radius of curvature of the arcuate slide surface 34 and the radius of curvature of the arcuate projection 61 may be set to any other value between 20mm, 25mm, 30mm, 35mm, 40mm, and 20mm to 40 mm. The ratio between the radius of curvature of the arcuate projection 61 on the patella prosthesis 60 and the radius of curvature of the arcuate sliding surface 34 on the patella femoral joint component 30 may be set to any of the other values between 0.8, 0.9, 1, and 0.8 to 1.
In this embodiment, the plane in which the tangent to the bottom of the arcuate slide surface 34 lies is parallel to the central plane between the medial and lateral condyles 10, 20, and an angle exists between the plane in which the tangent to the top of the arcuate slide surface 34 lies and the central plane between the medial and lateral condyles 10, 20. With the above structure, the arc-shaped sliding surface 34 on the patellofemoral joint component 30 can be further deflected towards the lateral condyle 20, so as to ensure that the patellofemoral joint component 30 can be in motion fit with the patellar prosthesis 60.
In the present embodiment, as shown in fig. 4, the angle α between the plane in which the tangent line of the top of the arc-shaped slide surface 34 is located and the center plane between the medial condyle 10 and the lateral condyle 20 is set to 15 °, so that the angle of the tangent line of the curved surface of the arc-shaped slide surface 34 is set to 0 ° to 15 °, and the patellofemoral joint component 30 can be offset toward the lateral condyle 20 to match the human body.
The central surface between the medial condyle 10 and the lateral condyle 20 enables the top of the patellofemoral joint component 30 to be offset toward the lateral condyle 20, thereby enabling a sliding track to be formed on the patellofemoral joint component 30, and further enabling the patellar prosthesis to be slidably engaged with the patellofemoral joint component 30 along the sliding track.
In this embodiment, the medial condyle 10, the lateral condyle 20, and the patellofemoral joint component 30 are all made of cobalt chrome molybdenum. By adopting the structure, the medial condyle 10, the lateral condyle 20 and the patellofemoral joint component 30 are made of cobalt chromium molybdenum materials, so that the knee joint prosthesis component is conveniently implanted into a human body, the problem that the knee joint prosthesis component is damaged due to shearing force is avoided, and the structural stability of the knee joint prosthesis component is improved.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A knee prosthesis assembly, the knee prosthesis assembly comprising:
A medial condyle (10) having a first connecting portion (11) connected to the femur of the human body;
A lateral condyle (20) having a second connecting portion (21) connected to the femur of the human body, the medial condyle (10) and the lateral condyle (20) being spaced apart;
a patellofemoral joint component (30), a first end of the medial condyle (10) and a first end of the lateral condyle (20) both being detachably disposed on the patellofemoral joint component (30), a second end of the medial condyle (10) and a second end of the lateral condyle (20) both extending away from the patellofemoral joint component (30);
an adjustment structure (40) comprising a first adjustment slot (41), a second adjustment slot (42), a first connecting rod (43) and a second connecting rod (44), wherein the first adjustment slot (41) is arranged on a patellofemoral joint component (30), the second adjustment slot (42) is arranged on the patellofemoral joint component (30), the first end of the first connecting rod (43) is connected with the medial condyle (10), the first connecting rod (43) is arranged in the first adjustment slot (41), the first end of the second connecting rod (44) is connected with the lateral condyle (20), the second connecting rod (44) is arranged in the second adjustment slot (42), the second end of the first connecting rod (43) is provided with a plurality of first teeth (431), the second end of the second connecting rod (44) is provided with a plurality of second teeth, the patellofemoral joint component (30) is provided with a plurality of teeth (431) which are meshed with the first teeth (431) and the second teeth (30) so as to rotate the medial condyle (30);
a patella prosthesis (60) in sliding engagement with the patellofemoral joint component (30);
A tibial insert (50) comprising a first insert (51) for mating with the medial condyle (10) and a second insert (52) for mating with the lateral condyle (20), the first insert (51) and the second insert (52) both being connected to a human tibia;
The adjustment structure (40) further comprises:
a first gear, a second end of the first connecting rod (43) is connected with the first gear;
The second end of the second connecting rod (44) is connected with the second gear, and the first gear and the second gear are both arranged in the tooth slot (31);
Adjusting gaps are arranged between the first connecting rod (43) and the first adjusting groove (41) and between the second connecting rod (44) and the second adjusting groove (42).
2. The knee joint prosthesis assembly according to claim 1, wherein the tooth slot (31) is provided with a first positioning column (32), and the first gear and the second gear are provided with positioning holes avoiding the first positioning column (32).
3. The knee joint prosthesis assembly according to claim 2, wherein the first positioning post (32) includes a first post section (321) and a second post section (322), one end of the first post section (321) is connected with one end of the second post section (322), the other end of the first post section (321) is connected with the patellofemoral joint component (30), the other end of the second post section (322) extends toward a direction away from the patellofemoral joint component (30), a cross-sectional dimension of the first post section (321) gradually increases in an up-to-down direction, and an outer sidewall of the second post section (322) is provided with a screw structure.
4. The knee joint prosthesis assembly according to claim 2, wherein the first connection portion (11) comprises a second positioning post (111), the second connection portion (21) comprises a third positioning post (211), a first end of the second positioning post (111) is connected with an upper surface of the medial condyle (10), a second end of the second positioning post (111) extends in a direction away from the medial condyle (10), a first end of the third positioning post (211) is connected with an upper surface of the lateral condyle (20), a second end of the third positioning post (211) extends in a direction away from the medial condyle (10), and an included angle exists between the first positioning post (32) and the second and third positioning posts (111, 211).
5. The knee prosthesis assembly according to claim 4, wherein a fourth positioning post (33) is provided on the surface of the patellofemoral joint component (30) facing the medial condyle (10) and the lateral condyle (20), the fourth positioning post (33) being arranged parallel to the first positioning post (32), the fourth positioning post (33) being provided with a deformation opening extending to its tip.
6. The knee joint prosthesis assembly of any one of claims 1 to 5, wherein,
The clockwise rotation angle of the patellofemoral joint component (30) is set between 5 ° and 10 °; and/or the number of the groups of groups,
The counterclockwise rotation angle of the patellofemoral joint component (30) is between 5 ° and 10 °.
7. The knee joint prosthesis assembly of any one of claims 1 to 5, wherein,
The ratio of the curvature of the medial condyle (10) to the curvature of the first shim (51) is set between 0.8 and 1; and/or the number of the groups of groups,
The ratio of the curvature of the lateral condyle (20) to the curvature of the second shim (52) is set between 0.4 and 0.7.
8. The knee joint prosthesis assembly of claim 1, wherein,
An arc-shaped sliding surface (34) is arranged at a position, close to the patella prosthesis (60), of the patellofemoral joint component (30), an arc-shaped protruding part (61) matched with the arc-shaped sliding surface (34) is arranged on the patella prosthesis (60), and the arc-shaped protruding part (61) is slidably arranged on the arc-shaped sliding surface (34);
The plane where the tangent line of the bottom of the arc-shaped slide surface (34) is located is parallel to the central surface between the inner condyle (10) and the outer condyle (20), and an included angle exists between the plane where the tangent line of the top of the arc-shaped slide surface (34) is located and the central surface between the inner condyle (10) and the outer condyle (20).
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| CN202410023862.XA CN117503435B (en) | 2024-01-08 | 2024-01-08 | Knee joint prosthesis assembly |
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| CN202410023862.XA CN117503435B (en) | 2024-01-08 | 2024-01-08 | Knee joint prosthesis assembly |
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| CN117503435B true CN117503435B (en) | 2024-04-30 |
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| US6602292B2 (en) * | 2001-03-06 | 2003-08-05 | Centerpulse Orthopedic Inc. | Mobile bearing patella prosthesis |
| WO2010088229A2 (en) * | 2009-01-27 | 2010-08-05 | Zimmer, Inc. | Total knee implant |
| US20140142714A1 (en) * | 2012-11-21 | 2014-05-22 | Abraham P. Wright | Knee prosthesis assembly having proportional coronal geometry |
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| CH689539A5 (en) * | 1991-06-17 | 1999-06-15 | Andre Baehler | Knee joint prosthesis |
| US5514183A (en) * | 1994-12-20 | 1996-05-07 | Epstein; Norman | Reduced friction prosthetic knee joint utilizing replaceable roller bearings |
| US6190415B1 (en) * | 1997-04-04 | 2001-02-20 | T. Derek V. Cooke | Deep flexion knee prosthesis |
| CN105636553A (en) * | 2013-09-09 | 2016-06-01 | 爱娃·卡布丽缇 | Adjustable modular spacer device for the articulation of the knee |
| CN105380734A (en) * | 2015-11-30 | 2016-03-09 | 北京爱康宜诚医疗器材股份有限公司 | Knee joint prosthesis |
| CN109199646A (en) * | 2017-07-03 | 2019-01-15 | 天津富华医疗科技有限公司 | Adjustable spring component on artificial knee joint |
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| CN117503435A (en) | 2024-02-06 |
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