CN203873920U - Anatomy reconstruction type artificial knee joint prosthesis - Google Patents
Anatomy reconstruction type artificial knee joint prosthesis Download PDFInfo
- Publication number
- CN203873920U CN203873920U CN201420147055.0U CN201420147055U CN203873920U CN 203873920 U CN203873920 U CN 203873920U CN 201420147055 U CN201420147055 U CN 201420147055U CN 203873920 U CN203873920 U CN 203873920U
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- China
- Prior art keywords
- prosthesis
- knee joint
- artificial knee
- joint prosthesis
- vertex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 210000000629 knee joint Anatomy 0.000 title claims abstract description 39
- 210000003484 anatomy Anatomy 0.000 title abstract 6
- 239000004698 Polyethylene Substances 0.000 claims abstract description 23
- 229920000573 polyethylene Polymers 0.000 claims abstract description 23
- -1 polyethylene Polymers 0.000 claims abstract description 22
- 210000001694 thigh bone Anatomy 0.000 abstract description 6
- 210000003141 lower extremity Anatomy 0.000 abstract description 4
- 210000003041 ligament Anatomy 0.000 abstract 2
- 210000002303 tibia Anatomy 0.000 description 12
- 210000000689 upper leg Anatomy 0.000 description 12
- 230000033001 locomotion Effects 0.000 description 10
- 210000003127 knee Anatomy 0.000 description 7
- 230000000717 retained effect Effects 0.000 description 5
- 238000007514 turning Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000035479 physiological effects, processes and functions Effects 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000002224 dissection Methods 0.000 description 3
- 238000013150 knee replacement Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 201000008482 osteoarthritis Diseases 0.000 description 2
- 230000002980 postoperative effect Effects 0.000 description 2
- 206010005963 Bone formation increased Diseases 0.000 description 1
- 206010023204 Joint dislocation Diseases 0.000 description 1
- 208000003947 Knee Osteoarthritis Diseases 0.000 description 1
- 210000001264 anterior cruciate ligament Anatomy 0.000 description 1
- 206010003246 arthritis Diseases 0.000 description 1
- 210000000544 articulatio talocruralis Anatomy 0.000 description 1
- 210000000845 cartilage Anatomy 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical group [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000005021 gait Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 210000005065 subchondral bone plate Anatomy 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000007306 turnover Effects 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
-
- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
Abstract
The utility model relates to a knee joint prosthesis, in particular to an anatomy reconstruction type artificial knee joint prosthesis. The anatomy reconstruction type artificial knee joint prosthesis solves the problem that in the structural design of an existing artificial knee joint prosthesis, force bearing does not conform to the human biomechanics. The anatomy reconstruction type artificial knee joint prosthesis comprises a thigh bone prosthesis, a tibial plateau prosthesis and a polyethylene liner. The included angle between the connecting line, between the vertex of the internal condyle of the thigh bone prosthesis and the vertex of the lateral condyle of the thigh bone prosthesis, and the horizontal direction is 3 degrees. The included angle between the connecting line, between the outer vertex of the internal condyle of the thigh bone prosthesis and the outer vertex of the lateral condyle of the thigh bone prosthesis, and the horizontal direction is 3 degrees. The tibial plateau prosthesis structurally comprises a U-shaped platform, wherein the lower surface of the U-shaped platform is connected with a stand column, wing plates are arranged on the stand column, the polyethylene liner is in a U shape, concave faces are formed in a U-shape arm, and the included angle between the connecting line, between the vertex of the inner side concave face and the vertex of the outer side concave face, and the direction of the horizontal bottom face is 3 degrees. According to the main innovation, the anatomy axis of the human lower limbs is not changed, the front cruciate ligaments and the back cruciate ligaments are reserved, and the anatomy reconstruction type artificial knee joint prosthesis better conforms to the human body biomechanics instead of the machinery mechanics.
Description
Technical field
This utility model relates to a kind of knee-joint prosthesis, specifically a kind of Anatomical Reconstruction formula artificial knee joint prosthesis.
Background technology
Artificial knee replacement surgery was once described as and the most successfully one of performed the operation in 20th century, and from the beginning of the seventies in last century, the full condyle displacement that John Insall proposes starts, and indicates carrying out of modern total knee replacement.A longer process has also been experienced in the development of artificial knee joint during this time, and along with people are to the deepening continuously of knee joint biomechanics Research, artificial knee joint prosthesis design concept is constantly updated, and surgical technic reaches its maturity, and surgical effect is sure.At present TKA be considered to treat whole latter stage or serious gonarthritis the most effectively, the most successfully one of operation.Make a general survey of the history that knee-joint prosthesis is designed and developed, the knee joint after the designing requirement displacement of modern prosthetic can better be recovered the kinematics characteristic of knee joint itself, requires to reduce the stress between articular prosthesis contact surface simultaneously, reduces prosthese wearing and tearing.In actual design, will take into account above requirement and have suitable difficulty, for reducing the compressive stress between condyle of femur metal prostheses and tibial plateau polyethylene prosthese, needing increases the contact area between prosthese, and prosthese is more mated.But thing followed problem is prosthese, the restriction of joint motions is also increased, the stress between tibial prosthesis and tibia interface also increases.Otherwise as increased the freedom of movement in joint, reduce the stress between tibial prosthesis and tibia interface, need to reduce the contact area between condyle of femur and tibial prosthesis.But the contact stress that the cost of bringing is tibia polyethylene prosthese increases, and certainly will increase like this polyethylene layering and break.Therefore, the contradiction between low stress and freedom of movement in prosthetic designs cannot solve all the time completely, and can only in design, find both equilibrium points.Disposal load prosthese---the disposal load prosthetic designs starting in the later stage seventies has changed the Design Mode of traditional knee-joint prosthesis in the past, it presents smooth free cheek between metal bottom bracket by polyethylene, allow polyethylene on metal bottom bracket surface, rotate and seesaw.This design can make the shearing force that produces in Normal Knee motion gait and twisting resistance be delivered to the soft tissue of knee joint peripheral theoretically, instead of be delivered to interface between the each contact component of prosthese or prosthese and bone, thereby polyethylene wear and prosthetic loosening are reduced to a minimum.The representative LCS prosthese of disposal load knee-joint prosthesis is in clinical practice after 25 years, and long term follow-up obtains gratifying surgical effect, thereby in recent years also has clinically the trend of continuous popularization.High flex prosthese---conventionally, the design of knee-joint prosthesis allows knee joint to have the motion of 0 ~ 120 degree, in the time exceeding the curvature movement of 120 degree, the prosthese radian of femoral-posterior condyles finishes, the now contact between prosthese shows as femoral-posterior condyles prosthese edge and contacts with the poly point-like of tibia, contact stress is large, thereby multilist reveals the premature wear of tibia polyethylene rear side.Improved high flex design is by increasing the osteotomy amount of femoral-posterior condyles, and femoral prosthesis postartis thickness is increased, extend postartis radian, thereby within the scope of knee sprung 120 ~ 150 degree, between prosthese, still keep face-face to contact, reduce the stress of polyethylene surface, thus the prosthese wearing and tearing while having reduced in theory knee joint extreme flexing.This type of design is very welcome in asian patients, due on living habit with American-European patient's difference, the postoperative kneed flexing of asian patients opponent requires higher, can more meet the demand of patient to high flexing motion of knee joint after adopting this design.
Along with popularizing of knee osteoarthritis concept, everybody has known that its disease damage position is mainly at articular surface, the disappearance, the subchondral bone that comprise articular surface cartilage are exposed, the stroke of meniscus wearing and tearing, hyperosteogeny and episome, but before and after knee joint, ligamentaum cruciatum is often got involved lighter, even if advanced osteoarthritis patient is no exception, and existing patients during undergoing total knee prosthesis surface replacement operation intersects or anterior cruciate ligament before and after all requiring to excise patient, and design and prevent joint dislocation with one simple " column ", make human body knee joint motion function obviously limited; In addition, stressed evenly for ensureing the contact surface of prosthese and skeleton, after existing patients during undergoing total knee prosthesis surface replacement operation, patient's anatomical axis and mechanical axis merge, and the function of femur outward turning and tibia inward turning while having lost knee sprung motion, so existing total knee replacement technology, can be understood as, be in order to alleviate patient's slight illness, a kind of palliative operation of the quality of making the life better.
Along with the people progressively improve the requirement of living standard, the drawback of existing artificial knee joint prosthesis manifests gradually, new, science, the prosthese that more meets Human Physiology become needs more; And the making rapid progress of science and technology, the keeping on improving of surgical technic, particularly materialogy and computer technology is flourish, makes the design of novel prosthese and application become possibility.
In normal physiological situation, in the time of human body erect position, capital center, should be in same straight line apart from the center of ankle joint, this straight line is mechanical axis or the axial alignment of lower limb.The femur anatomical axis line extending through femoral shaft center and mechanical axis are at knee joint center, and with proximal tibia, the Tibia Anatomy axes intersect that had both extended at tibial shaft center is converged, and its angle is on average about 6 °; Shin thigh angle is the dissection axis of femur and the angle laterally that Tibia Anatomy axis is formed centrally in knee joint, average 174 ° of this angle.The artificial knee joint that modern clinic is conventional is referred to as three generations's knee-joint prosthesis, knee joint dissect physiology form and biomechanics are approached very much, but postoperative stressed even for ensureing prosthese, after osteotomy, femoral rotation, parallel with tibial surface, 3 ° of disappearances of physiology inward turning of femur, are not Anatomical Reconstruction truly.
Summary of the invention
This utility model, in order to solve the stressed problem that does not meet body biomechanics existing in present artificial knee joint prosthesis structural design, provides a kind of Anatomical Reconstruction formula artificial knee joint prosthesis.
The technical solution of the utility model is, a kind of Anatomical Reconstruction formula artificial knee joint prosthesis, comprise femoral prosthesis, tibial plateau prosthese and polyethylene liner, between the medial condyle of described femoral prosthesis and the summit of lateral condyle, line and horizontal direction form 3 degree angles, the medial condyle of described femoral prosthesis and the outer dead centre of lateral condyle and horizontal direction form 3 degree angles, described tibial plateau borrowed structure comprises U-shaped platform, U-shaped platform lower surface connects column, column is provided with wing plate, described polyethylene liner is U-shaped, on U-shaped arm, be provided with concave surface, wherein between inner side concave surface and the summit of outside concave surface, line and horizontal bottom direction form 3 degree angles.
Compare with existing apparatus, artificial knee joint prosthesis described in the utility model, on the basis of existing artificial knee joint prosthesis, courageously improve, by mechanical axis osteotomy but on prosthese design retain knee joint 3 spend introversion femur before and after condyle dissect size, stop in femur and moved by the gradient inside tibia pad, easily caused the problem of prosthetic loosening due to femur with Tibial osteotomy face with the vertical diagonal osteotomy that overcomes originally design of lower limb mechanical axis.Thighbone end prosthesis adopts more slim design not need break nest osteotomy, and tibia has retained intercondyloid spine, thereby has retained more bone amount.To real surface replacement further; And tibia-bone interface adopts the wing grappling design of twin columns front and back, when guarantee is stable, for front and back intersection stop is abdicated space, before and after having retained, the tetragonal function of ligamentaum cruciatum has improved kneed stability, so substantially, retain kneed complete structure, reached the identical function of Normal Knee.Femur-tibial prosthesis interface adopts the more wear-resisting high crosslinked polyethylene mating with tibial prosthesis to fill, to increase the service life of prosthese.
And topmost innovation of the present utility model is not change the dissection axis of human body lower limbs, ligamentaum cruciatum before and after retaining, meets the biomechanics of human body but not Mechanics of Machinery more.
Brief description of the drawings
Fig. 1 is femoral prosthesis structural representation described in the utility model
Fig. 2 is that the A of Fig. 1 is to view
Fig. 3 is that the B of Fig. 1 is to view
Fig. 4 is polyethylene liner structure chart
Fig. 5 is the upward view of Fig. 4
Fig. 6 is tibial plateau borrowed structure figure
Fig. 7 is the upward view of Fig. 6
Fig. 8 is the top view of Fig. 6.
Detailed description of the invention
A kind of Anatomical Reconstruction formula artificial knee joint prosthesis, comprise femoral prosthesis 1, tibial plateau prosthese 7 and polyethylene liner 4, as schematically shown in Figure 1, between the medial condyle 2 of described femoral prosthesis 1 and the lower summit of lateral condyle 3, line and horizontal direction form 3 degree angles, as schematically shown in Figure 3, the medial condyle 2 of described femoral prosthesis forms 3 degree angles with the outer dead centre of lateral condyle 3 and horizontal direction, as Fig. 6, 7, 8 institutes are illustrated, described tibial plateau prosthese 7 structures comprise U-shaped platform, U-shaped platform lower surface connects column 8, column 8 is provided with wing plate 9, as Fig. 4, 5 institutes are illustrated, described polyethylene liner 4 is U-shaped, on U-shaped arm, be provided with concave surface, wherein between inner side concave surface 5 and the summit of outside concave surface 6, line and horizontal bottom direction form 3 degree angles.
The U-shaped platform upper surface of tibial plateau prosthese 7 is groove shape, and polyethylene liner 4 lower surface edges are card shape.Polyethylene liner is just in time stuck in the groove of U-shaped platform upper surface like this.
The inclined design of not doing femoral prosthesis embodies 3 degree inward turnings, but low outer height in adopting, and medial condyle far-end and rear side prosthesis slightly thick compared with lateral condyle prosthese, form 3 degree angles, reply the physiology and appearance of femur inward turning.
Polyethylene liner has the form matching with tibial plateau prosthese upper surface, and its lower surface elevated regions can perfection be press-fit in surface on tibial plateau prosthese, its upper surface, still adopt existing spherical concave design with the contact surface of femoral prosthesis, with perfection laminating femoral prosthesis and allow slidingly before and after it to roll movement, cater to low outer high anatomic form in femur, unlikely destruction Tibia Anatomy axis again, liner also adopts interior low outer high design, both outside was thick compared with inner side, rebuild the relation of dissecting axis and mechanical axis.Knee design is the earliest respectively at femur-prosthese, tibia-prosthese contact surface turns over angle in setting up, make prosthese-bone interface multidirectional stressed, though retained dissection axis, meet biomechanics, but violate Mechanics of Machinery, finally cause operative failure, and the design has retained the traditional vertical mechanical behavior of prosthese-bone interface, and will in turn over design indicates in polyethylene liner, and liner do not adopt inclined design but high outside and low outside design, like this, each contact surface has all kept the vertical single load bearing mechanism of mechanically stable, has improved the survival rate of prosthese.
Tibial plateau prosthese adopts middle hollow out, front end is connected, " U " type form Design, with the physiologic spaces of ligamentaum cruciatum before and after reserving, upper surface caves in for being press-fitted the polyethylene liner of corresponding form, and lower surface adopts the two column design to downward-extension with the contact surface of bone, subsidiary aileron, and the outside of heel post and the design of the inner side of inner side column outside prevents the wing of the displacement of rotation.
Claims (2)
1. an Anatomical Reconstruction formula artificial knee joint prosthesis, comprise femoral prosthesis (1), tibial plateau prosthese (7) and polyethylene liner (4), it is characterized in that: between the medial condyle (2) of described femoral prosthesis (1) and the lower summit of lateral condyle (3), line and horizontal direction form 3 degree angles, the medial condyle (2) of described femoral prosthesis forms 3 degree angles with the outer dead centre of lateral condyle (3) and horizontal direction, described tibial plateau prosthese (7) structure comprises U-shaped platform, U-shaped platform lower surface connects column (8), column (8) is provided with wing plate (9), described polyethylene liner (4) is U-shaped, on U-shaped arm, be provided with concave surface, wherein between inner side concave surface (5) and the summit of outside concave surface (6), line and horizontal bottom direction form 3 degree angles.
2. Anatomical Reconstruction formula artificial knee joint prosthesis according to claim 1, is characterized in that: the U-shaped platform upper surface of tibial plateau prosthese (7) is groove shape, and polyethylene liner (4) lower surface edge is card shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420147055.0U CN203873920U (en) | 2014-03-30 | 2014-03-30 | Anatomy reconstruction type artificial knee joint prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420147055.0U CN203873920U (en) | 2014-03-30 | 2014-03-30 | Anatomy reconstruction type artificial knee joint prosthesis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203873920U true CN203873920U (en) | 2014-10-15 |
Family
ID=51674478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420147055.0U Expired - Lifetime CN203873920U (en) | 2014-03-30 | 2014-03-30 | Anatomy reconstruction type artificial knee joint prosthesis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203873920U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105213071A (en) * | 2015-10-21 | 2016-01-06 | 苏州锐进医疗科技有限公司 | A kind of bone conservative knee-joint prosthesis |
-
2014
- 2014-03-30 CN CN201420147055.0U patent/CN203873920U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105213071A (en) * | 2015-10-21 | 2016-01-06 | 苏州锐进医疗科技有限公司 | A kind of bone conservative knee-joint prosthesis |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141015 |