CN104887356A - Patellar prosthesis - Google Patents
Patellar prosthesis Download PDFInfo
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- CN104887356A CN104887356A CN201510276620.2A CN201510276620A CN104887356A CN 104887356 A CN104887356 A CN 104887356A CN 201510276620 A CN201510276620 A CN 201510276620A CN 104887356 A CN104887356 A CN 104887356A
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- main part
- patellar prosthesis
- fixing base
- pars contractilis
- prosthesis according
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Abstract
The invention provides a patellar prosthesis which comprises a main body portion, a fixed portion and a telescopic portion. The fixed portion is connected with the main body portion, and the telescopic portion is connected between the main body portion and the fixed portion so as to adjust the distance between the main body portion and the fixed portion. Due to the fact that the telescopic portion is arranged between the main body portion and the fixed portion, it is ensured that the distance between the main body portion and the fixed portion of the patellar prosthesis is adjusted along with physiological space changes during joint movement, and therefore the height of the patellar prosthesis is increased. In this way, the normal joint space is ensured, and joint pain and abnormal abrasion caused by the unreasonable space are avoided. The patellar prosthesis is simple in structure and capable of automatically adjusting the height.
Description
Technical field
The present invention relates to artificial joint field, in particular to a kind of patellar prosthesis.
Background technology
Total knee arthroplasty has definite and significant curative effect for the diseases of knee joint in whole latter stage that a variety of causes causes.Obviously can improve the knee joint function of patient, alleviate gonalgia during walking, orthotic knee intraarticular valgus deformity, significantly improves the quality of life of patient.
Since the seventies, knee replacements is developed fast.No matter in the design concept of product, the selection of material, biomechanics Research and Surgical technique, be all greatly improved.Especially the Follow-up results that a large amount of case is excellent makes doctor and patient set up larger confidence to artificial knee joint prosthesis displacement.
In total knee arthroplasty, patella complication has higher ratio.More commonly SLP and dislocation, Patella fracture, patellar prosthesis wear and tear and loosen.At present, the patella for regression serious wear carry out replacing accept by everybody, knee-joint prosthesis design more considers the coupling of kneecap stock prosthese, is provided with the groove of similar coaster in femoral prosthesis front.Along with the extensive application of Patellar arthoplasty art, the design of patellar prosthesis becomes the key factor affecting total knee replacement surgical effect.At present, the design of patellar prosthesis is generally the product of level altitude, namely patellar prosthesis is fixed pattern prosthese, be integrated solid type structure between hipbone articular surface and surface of bone stationary plane, reckon without the cushioning effect in the impact and joint motion of excising patella height after subpatellar fat pad in total knee replacement operation.Because height cannot carry out from main regulation according to the physiological interstitial in joint motion, easily cause the wearing and tearing of arthralgia and increasing patella.
Summary of the invention
Main purpose of the present invention is to provide a kind of structure simple and can from the patellar prosthesis of main regulation height.
To achieve these goals, the invention provides a kind of patellar prosthesis, comprising: main part; Fixed part, is connected with main part; Pars contractilis, is connected between main part and fixed part to regulate the spacing distance of main part and fixed part.
Further, pars contractilis is elastic component.
Further, elastic component is arranged twist.
Further, elastic component is spring structure.
Further, the cross section of main part is circular or oval.
Further, fixed part comprises: fixing base, and the upper surface of fixing base is connected with pars contractilis, and lower surface and the patella osteotomy surface of fixing base fit; At least one connector, at least one connector is connected to the lower surface of fixing base.
Further, the cross section of fixing base is circular.
Further, main part and fixing base are coaxially arranged.
Further, the cross section of main part is circular, and the radius of main part is identical with the radius of fixing base, and the outer surface on the longitudinal direction of pars contractilis is positioned at the outer peripheral face of main part or is positioned at the outer peripheral face place of main part.
Further, main part has sphere sticking part away from one end of pars contractilis.
Apply patellar prosthesis of the present invention, in main part and fixed part, be provided with pars contractilis, can ensure that patellar prosthesis regulates the distance between main part and fixed part along with the change of physiological interstitial when joint motion, namely have adjusted the height of patellar prosthesis.This ensures that there natural joint gap, prevent the unreasonable generation of the arthralgia caused in gap and the generation of heel and toe wear.Patellar prosthesis structure of the present invention is simple and can from main regulation height.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the overall structure schematic diagram of the embodiment according to patellar prosthesis of the present invention.
Wherein, above-mentioned accompanying drawing comprises the following drawings labelling:
10, main part;
20, fixed part;
21, fixing base;
22, connector;
30, pars contractilis.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 1, the invention provides a kind of patellar prosthesis.
Particularly, patellar prosthesis comprises main part 10, fixed part 20 and pars contractilis 30.Wherein, fixed part 20 is connected with main part 10, improves integrally-built stability.Pars contractilis 30 is connected between main part 10 and fixed part 20, and main part 10 is connected with fixed part 20 by pars contractilis 30, and pars contractilis 30 is for regulating the spacing distance of main part 10 and fixed part 20.
Pars contractilis 30 is provided with in main part 10 with fixed part 20, pars contractilis 30 can stretch, the height of pars contractilis 30 itself can change, that is can ensure that patellar prosthesis regulates the distance between main part 10 and fixed part 20 along with the change of physiological interstitial when joint motion, have adjusted the height of patellar prosthesis.This ensures that there natural joint gap, prevent the unreasonable generation of the arthralgia caused in gap and the generation of heel and toe wear.Patellar prosthesis structure of the present invention is simple and can from main regulation height.
Preferably, pars contractilis 30 is elastic component, and elastic component has elastically deformable.
As shown in Figure 1, elastic component is spring structure.Particularly, can twist, structure is simple and stable.
Preferably, fixed part 20 comprises fixing base 21 and at least one connector 22.
Particularly, the upper surface of fixing base 21 is connected with pars contractilis 30, and lower surface and the patella osteotomy surface of fixing base 21 fit.At least one connector 22 is connected to the lower surface of fixing base 21, and fixing base 21 provides installation foundation to connector 22.
Preferably, the cross section of main part 10 is circular or oval, and the upper surface of main part 10 is smooth spherical arc, and that is main part 10 has sphere sticking part away from one end of pars contractilis 30, and this sphere sticking part is more comfortable with coordinating of surface of bone.
The cross section of fixing base 21 is circular.Preferably, main part 10 and fixing base 21 are coaxially arranged.Stability Analysis of Structures, patient experiences effective.
Preferably, the cross section of main part 10 is circular, and the radius of main part 10 is identical with the radius of fixing base 21, and the outer surface on the longitudinal direction of pars contractilis 30 is positioned at the outer peripheral face of main part 10 or is positioned at the outer peripheral face place of main part 10.Such design makes globality better, and such as telescopic spring distortion is more smooth and easy for pars contractilis 30, also further increases service life.
In the present embodiment, connector 22 three, three connectors 22 are uniform around the axis circumference of fixing base 21, and structure is simple, stablize, be easy to realize.In three connectors 22, the angle often between adjacent two connectors 22 is 120 degree, and the syndeton of three connectors 22 is comparatively firmly with stable.
In the present embodiment, main part 10 can be designed to different diameters as required.The radius of main part 10 and the radius of fixing base 21 also can be arranged to different radius size, and connector 22 is embedded in the physiology sclerotin of patella osteotomy surface, firm with cement reaction.
Using patellar prosthesis of the present invention, is elastic construction between hipbone articular surface and surface of bone stationary plane, highly can carry out from main regulation according to the physiological interstitial in joint motion, can effectively avoid arthralgia and wearing and tearing.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
Apply patellar prosthesis of the present invention, pars contractilis is provided with in main part 10 with fixed part 20, can ensure that patellar prosthesis regulates the distance between main part 10 and fixed part 20 along with the change of physiological interstitial when joint motion, namely have adjusted the height of patellar prosthesis.This ensures that there natural joint gap, prevent the unreasonable generation of the arthralgia caused in gap and the generation of heel and toe wear.Patellar prosthesis structure of the present invention is simple and can from main regulation height.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a patellar prosthesis, is characterized in that, comprising:
Main part (10);
Fixed part (20), is connected with described main part (10);
Pars contractilis (30), is connected between described main part (10) and described fixed part (20) to regulate the spacing distance of described main part (10) and described fixed part (20).
2. patellar prosthesis according to claim 1, is characterized in that, described pars contractilis (30) is elastic component.
3. patellar prosthesis according to claim 2, is characterized in that, described elastic component is arranged twist.
4. patellar prosthesis according to claim 3, is characterized in that, described elastic component is spring structure.
5. patellar prosthesis according to claim 1, is characterized in that, the cross section of described main part (10) is circular or oval.
6. patellar prosthesis according to claim 5, is characterized in that, described fixed part (20) comprising:
Fixing base (21), the upper surface of described fixing base (21) is connected with described pars contractilis (30), and lower surface and the patella osteotomy surface of described fixing base (21) fit;
At least one connector (22), described at least one connector (22) is connected to the lower surface of described fixing base (21).
7. patellar prosthesis according to claim 6, is characterized in that, the cross section of described fixing base (21) is circular.
8. patellar prosthesis according to claim 7, is characterized in that, described main part (10) and described fixing base (21) are coaxially arranged.
9. patellar prosthesis according to claim 8, it is characterized in that, the cross section of described main part (10) is circular, the radius of described main part (10) is identical with the radius of described fixing base (21), and the outer surface on the longitudinal direction of described pars contractilis (30) is positioned at the outer peripheral face of described main part (10) or is positioned at the outer peripheral face place of described main part (10).
10. patellar prosthesis according to claim 1, is characterized in that, described main part (10) has sphere sticking part away from one end of described pars contractilis (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510276620.2A CN104887356A (en) | 2015-05-26 | 2015-05-26 | Patellar prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510276620.2A CN104887356A (en) | 2015-05-26 | 2015-05-26 | Patellar prosthesis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104887356A true CN104887356A (en) | 2015-09-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510276620.2A Pending CN104887356A (en) | 2015-05-26 | 2015-05-26 | Patellar prosthesis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104887356A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107280822A (en) * | 2017-08-02 | 2017-10-24 | 北京安颂科技有限公司 | Patellar prosthesis and artificial knee joint |
-
2015
- 2015-05-26 CN CN201510276620.2A patent/CN104887356A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107280822A (en) * | 2017-08-02 | 2017-10-24 | 北京安颂科技有限公司 | Patellar prosthesis and artificial knee joint |
| CN107280822B (en) * | 2017-08-02 | 2023-09-12 | 北京安颂科技有限公司 | Patella prosthesis and artificial knee joint |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |