CN204521059U - Knee joint rotating platform prosthesis - Google Patents
Knee joint rotating platform prosthesis Download PDFInfo
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- CN204521059U CN204521059U CN201420854522.3U CN201420854522U CN204521059U CN 204521059 U CN204521059 U CN 204521059U CN 201420854522 U CN201420854522 U CN 201420854522U CN 204521059 U CN204521059 U CN 204521059U
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Abstract
The utility model discloses a kind of knee joint rotating platform prosthesis, this knee joint rotating platform prosthesis comprises condyle of femur (20), platform pad (30) and platform holder (40), the lower surface (31) of platform pad (30) is flat surface, the middle position of lower surface (31) has extended to form rotary stopper post (32) downwards, the upper surface (41) of platform holder (40) is flat surface, the middle position of upper surface (41) has extended to form rotary stopper hole (42) downwards, in the pluggable rotary stopper hole (42) to platform holder (40) of rotary stopper post (32) on platform pad (30), freely can rotate relative to platform holder (40) to make platform pad (30).Knee joint rotating platform prosthesis structure of the present utility model is simple, easy for installation, and good stability, the holotype both having remained prosthetic joint face is right, and what remain again prosthese rotates freely function.
Description
Technical field
This utility model relates to a kind of artificial knee joint prosthesis, particularly relates to a kind of knee joint rotating platform prosthesis.
Background technology
Knee-joint prosthesis is used to replace kneed surgical implant, for knee joint surface knee replacement surgery.As shown in Figures 1 to 4, the structure of existing knee-joint prosthesis mainly press-fit, is made up of condyle of femur 11, platform pad 12 and platform holder 13.Wherein, the material of condyle of femur 11, platform holder 13 is vitallium, and the material of platform pad 12 is ultra-high molecular weight polyethylene.Platform holder 13 is sealed for being press-fitted with platform pad 12, and platform pad 12 front portion is provided with translot, is convenient to the locked portions when platform holder 13 is installed with platform pad 12 and bounces back.
Though the alternative knee joint femoral of above-mentioned existing knee joint and tibia part articular surface, really there is progressive, but but find when reality uses also to have some shortcomings in its structure, cause this knee joint to fail to reach best result of use in practical application, its shortcoming is summarized as follows:
1) not easily install.Platform pad and platform holder need when installing just can be in place by very large thrust, and by the conduction of power, the bone cement between platform holder and tibia cross section may be made to produce gap, and in life-time service, there is loosening danger in platform holder and tibia cross section afterwards.
2) serious wear.Fixed platform prosthese can not be made geometric shape and mate completely, otherwise can spinfunction be lost, when fixed platform prosthese rotates, a part for femoral prosthesis can clash into tibial prosthesis face, thus weares and teares at the articular surface place that lateral femoral condyle prosthesis and platform pad form.
3) LCS and rotate freely inharmonious.Still there is LCS and contradiction between rotating freely in existing fixed platform prosthese, do not mate owing to fixed platform prosthetic designs must there be slight geometric shape, the kinetics deviation of the exception therefore occurred in low restricted type prosthese still exists, and is urgently further improved.
Utility model content
It is simple, easy for installation that the purpose of this utility model is to provide a kind of structure, and the knee joint rotating platform prosthesis of good stability.
For achieving the above object, the concrete technical scheme of knee joint rotating platform prosthesis of the present utility model is as follows:
A kind of knee joint rotating platform prosthesis, comprise condyle of femur, platform pad and platform holder, the lower surface of platform pad is flat surface, the middle position of lower surface has extended to form rotary stopper post downwards, the upper surface of platform holder is flat surface, the middle position of upper surface has extended to form rotary stopper hole downwards, and the rotary stopper post on platform pad is pluggable in the rotary stopper hole in platform holder, freely can rotate to make platform pad relative to platform holder.
Knee joint rotating platform prosthesis of the present utility model has the following advantages:
1) the right high matching that stock-tibial prosthesis face can be provided of high shape of condyle of femur peace cushion articular surface, thus reduce the wearing and tearing of articular surface, and therefore do not make range of motion be restricted.In addition, because platform rebasing energy is freely movable, the active force that bears of knee joint is at the dorsal surface of platform pad, and it is minimum to poly stress, so can solve the problem of platform acting as a cushion flank wear preferably.And rotation platform is paid somebody's debt and expected repayment later and the multidirectional wearing and tearing between articular surface can be transformed into one-way abrasion, is also conducive to extending poly service life.
2) rotary flat cushion can malrotation between compensation operation operation or stock-tibial prosthesis of causing of postoperative normal activity; this malrotation can produce torsion; for fixed platform pad; polyethylene platform dig pass by high coupling is handed to platform acting as a cushion side; in rotation platform knee joint; the holder of optimal position of sound production tibial plateau can be selected at proximal tibia in art, and do not affect platform pad in knee sprung overall process with femoral prosthesis side coincide.
3) when knee joint high flexing, the still high contact area of Maintenance Unit-tibial prosthesis.To normal person or the patient carrying out knee prosthesis, under knee joint high flexion, condylus lateralis femoris rolls usually after tibial plateau, for fixed platform pad, because sagittal high shape is right, roll after this femur can not be there is, the platform pad rear portion polyethylene wear easily causing the later stage serious, and rotary flat cushion is while maintenance stock-tibial prosthesis face matched, allows the femur of knee joint when high flexion state to move after tibial plateau, thus reduce the wearing and tearing to platform pad.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing knee-joint prosthesis;
Fig. 2 is the structural representation of the condyle of femur in Fig. 1;
Fig. 3 is the structural representation of the platform pad in Fig. 1;
Fig. 4 is the structural representation of the platform holder in Fig. 1;
Fig. 5 is the structural representation of knee joint rotating platform prosthesis of the present utility model;
Fig. 6 is the structural representation of the condyle of femur in Fig. 5;
Fig. 7 is the structural representation of the platform pad in Fig. 5;
Fig. 8 is the structural representation of the platform holder in Fig. 5.
Detailed description of the invention
In order to better understand the purpose of this utility model, structure and function, below in conjunction with accompanying drawing, further detailed description is done to a kind of knee joint rotating platform prosthesis of the present utility model.
As shown in Fig. 5 to Fig. 8, knee joint rotating platform prosthesis of the present utility model comprises condyle of femur 20, platform pad 30 and platform holder 40, wherein, the lower surface 31 of platform pad 30 is flat surface, the middle position of lower surface 31 has extended to form rotary stopper post 32 downwards, the upper surface 41 of platform holder 40 is also flat surface, the middle position of upper surface 41 has extended to form rotary stopper hole 42 downwards, rotary stopper post 32 on platform pad 30 is pluggable in the rotary stopper hole 42 in platform holder 40, freely can rotate to make platform pad 30 relative to platform holder 40.In addition, the condyle of femur 20 in this utility model, platform holder 40 preferably use the manufacture of vitallium material, and platform pad 30 preferably uses superhigh molecular weight polyethylene material manufacture.Thus, platform pad of the present utility model can carry out free rotation in platform holder, meets normal human body natural's motion of knee joint process.
Further, the development length of the rotary stopper post 32 on platform pad 30 is less than the development length in the rotary stopper hole 42 on platform pad 30.In addition, the inwall in the rotary stopper hole 42 on platform pad 30 is formed with kink 43, rotary stopper post 32 on platform pad 30 is plugged into after in the rotary stopper hole 42 in platform holder 40, and rotary stopper post 32 is resisted against kink 43 place on the inwall of rotary stopper hole 42.
Thus, knee joint rotating platform prosthesis of the present utility model has superior knee joint kinetics.Usually, operation technique or postoperative normal activity can cause malrotation between femoro-tibial articular, thus produce torsion.For fixed platform pad, the polyethylene platform dig pass by high coupling is handed to platform acting as a cushion side; And for rotation platform knee joint, because rotatable platform pad can compensate this malrotation, the holder of optimal position of sound production tibial plateau can be selected at proximal tibia in art, and do not affect platform pad in knee sprung overall process with femoral prosthesis side coincide.
Further, the top of platform pad 30 is formed with arc-shaped curved surface 33, and the bottom of condyle of femur 20 is the arc matched with the arc-shaped curved surface 33 on platform pad 30, and condyle of femur 20 is arranged on the arc-shaped curved surface 33 on platform pad 30.In addition, the dorsal part of the arc-shaped curved surface 33 on platform pad 30 has upwards extended to form condyle of femur backup plate 34, and condyle of femur 20 to be arranged on arc-shaped curved surface 33 and against the condyle of femur backup plate 34 of living arc-shaped curved surface 33 dorsal part.
Thus, the articular surface place height shape of the condyle of femur peace cushion in this utility model coordinates rightly, makes femoro-tibial articular mask have matched, thus reduces the wearing and tearing of articular surface, and range of motion also can not be made to be restricted.
It is right that knee joint rotating platform prosthesis of the present utility model has high articular surface shape, the increase of contact area means that the mechanical stress acting on articular surface can be distributed on larger area, make the reduction that contact stress is proportional, thus avoid the excessive wear of platform pad; Also there is superior knee joint kinetics simultaneously, because in rotating platform prosthesis, femoral prosthesis peace cushion has good geometric match, thus considerably reduce abnormal movement, make it have more superior knee joint kinetics.
By specific embodiment, this utility model is further described above; but it should be understood that; here concrete description; should not be construed as the restriction to essence of the present utility model and scope; one of ordinary skilled in the art to the various amendments that above-described embodiment is made, belongs to the scope that this utility model is protected after reading this specification.
Claims (5)
1. a knee joint rotating platform prosthesis, comprise condyle of femur (20), platform pad (30) and platform holder (40), it is characterized in that, the lower surface (31) of platform pad (30) is flat surface, the middle position of lower surface (31) has extended to form rotary stopper post (32) downwards, the upper surface (41) of platform holder (40) is flat surface, the middle position of upper surface (41) has extended to form rotary stopper hole (42) downwards, in the pluggable rotary stopper hole (42) to platform holder (40) of rotary stopper post (32) on platform pad (30), freely can rotate relative to platform holder (40) to make platform pad (30).
2. knee joint rotating platform prosthesis according to claim 1, it is characterized in that, the development length of the rotary stopper post (32) on platform pad (30) is less than the development length in the rotary stopper hole (42) on platform pad (30).
3. knee joint rotating platform prosthesis according to claim 2, it is characterized in that, the inwall in the rotary stopper hole (42) on platform pad (30) is formed with kink (43), rotary stopper post (32) on platform pad (30) is plugged into after in the rotary stopper hole (42) in platform holder (40), and rotary stopper post (32) is resisted against kink (43) place on rotary stopper hole (42) inwall.
4. knee joint rotating platform prosthesis according to claim 1, it is characterized in that, the top of platform pad (30) is formed with arc-shaped curved surface (33), the bottom of condyle of femur (20) is the arc matched with the arc-shaped curved surface (33) on platform pad (30), and condyle of femur (20) is arranged on the arc-shaped curved surface (33) on platform pad (30).
5. knee joint rotating platform prosthesis according to claim 4, it is characterized in that, the dorsal part of the arc-shaped curved surface (33) on platform pad (30) has upwards extended to form condyle of femur backup plate (34), and it is upper and against the condyle of femur backup plate (34) of living arc-shaped curved surface (33) dorsal part that condyle of femur (20) is arranged on arc-shaped curved surface (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420854522.3U CN204521059U (en) | 2014-12-29 | 2014-12-29 | Knee joint rotating platform prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420854522.3U CN204521059U (en) | 2014-12-29 | 2014-12-29 | Knee joint rotating platform prosthesis |
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| CN204521059U true CN204521059U (en) | 2015-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420854522.3U Active CN204521059U (en) | 2014-12-29 | 2014-12-29 | Knee joint rotating platform prosthesis |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104490493A (en) * | 2014-12-29 | 2015-04-08 | 北京市春立正达医疗器械股份有限公司 | Knee-joint rotating platform prosthesis |
| CN107518965A (en) * | 2016-11-30 | 2017-12-29 | 嘉思特华剑医疗器材(天津)有限公司 | Radially constrain rotatable platform articular surface knee-joint prosthesis |
-
2014
- 2014-12-29 CN CN201420854522.3U patent/CN204521059U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104490493A (en) * | 2014-12-29 | 2015-04-08 | 北京市春立正达医疗器械股份有限公司 | Knee-joint rotating platform prosthesis |
| CN107518965A (en) * | 2016-11-30 | 2017-12-29 | 嘉思特华剑医疗器材(天津)有限公司 | Radially constrain rotatable platform articular surface knee-joint prosthesis |
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| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20191213 Address after: 054700 east side of Tengfei road and south side of Xinde Road, Weixian high tech Industrial Development Zone, Xingtai City, Hebei Province Patentee after: Hebei Chunli hangnuo New Material Technology Co., Ltd Address before: 101112 Beijing city Golden Triangle town Huoxian Tongzhou District Development Zone Xin Mi Road No. 17 Patentee before: Beijing Chunlizhengda Medical Instrument Co., Ltd. |