CN213283595U - High-limit type rotary platform knee joint prosthesis - Google Patents
High-limit type rotary platform knee joint prosthesis Download PDFInfo
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- CN213283595U CN213283595U CN202021832130.9U CN202021832130U CN213283595U CN 213283595 U CN213283595 U CN 213283595U CN 202021832130 U CN202021832130 U CN 202021832130U CN 213283595 U CN213283595 U CN 213283595U
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Abstract
The utility model belongs to the technical field of knee joint prosthesis's technique and specifically relates to a high-limit type rotary platform knee joint prosthesis is related to, including tibial plateau support, level rotate tibial plateau pad on tibial plateau support, connect in tibial plateau support keep away from tibial plateau fill-up one side tibial medullary needle, with tibial plateau fill-up matched with thighbone condyle prosthesis and connect and keep away from the thighbone marrow needle of tibial plateau fill-up one side at thighbone condyle prosthesis. The application has the effect of improving the physiological motion of the normal knee joint which cannot be well realized after the operation of the high-limit knee joint prosthesis.
Description
Technical Field
The application relates to the technical field of knee joint prostheses, in particular to a high-limit type rotating platform knee joint prosthesis.
Background
The high-limit knee prosthesis is a kind of surgical implant used to replace knee joint, and is commonly used in knee joint revision surgery with bone defect and unstable joint, so as to restore normal physiological motion of knee joint.
Although the high-limit knee joint prosthesis is widely applied to joint replacement surgery, the applicant finds that in the related art, the tibial platform pad and the tibial platform support of the high-limit knee joint prosthesis are locked by clamping a bump and a groove, and physiological motion of a normal knee joint cannot be well realized after surgery, and needs to be further improved, so that how to develop a prosthesis which meets the local physiological and biomechanical requirements and can reproduce normal kinematic characteristics of the knee joint is one of the current important research subjects in the field.
In view of the above-mentioned related art, the inventors consider that there is a drawback in that the highly constrained knee prosthesis does not well perform physiological motions of the normal knee joint after the operation.
SUMMERY OF THE UTILITY MODEL
In order to improve the defect that the physiological motion of a normal knee joint cannot be well realized after a high-limit knee joint prosthesis is operated, the application provides a high-limit rotary platform knee joint prosthesis.
The application provides a high restriction type rotary platform knee joint prosthesis adopts following technical scheme:
the utility model provides a high restricted type rotary platform knee joint prosthesis, includes that tibial plateau holds in the palm, the level rotates the tibial plateau pad on tibial plateau holds in the palm, connects in tibial plateau holds in the palm and keeps away from the tibial plateau broach of tibial plateau pad one side, with the femoral condyle prosthesis of tibial plateau pad matched with and connect the femoral condyle prosthesis and keep away from the femoral broach of tibial plateau pad one side.
Through adopting above-mentioned technical scheme, during normal bucking, can produce relative inside and outside rotation between thighbone condyle prosthesis and the shin bone platform pad, and simultaneously, still there is the rotation about of small range, because be normal running fit between shin bone platform pad and the shin bone platform support, therefore, the pivoted in-process, thighbone condyle prosthesis can drive the shin bone platform pad fine motion, just can satisfy the normal physiology motion of knee joint, make the lower surface of thighbone condyle prosthesis and the upper surface of platform pad be in the state that matches completely all the time, compare in the high limit type knee joint prosthesis among the correlation technique, thighbone condyle prosthesis in this application drives shin bone platform pad and can not be restricted when rotating about carrying out small range together, satisfy the normal physiology motion of knee joint more.
Preferably, the side of the tibial platform pad away from the femoral condyle prosthesis is formed with a limiting column;
the tibial plateau holds in the palm including the landing slab and integrated connection at the landing slab sleeve towards tibial broach one side, and the socket is seted up with the junction of landing slab and is supplied spacing post to insert the jack so that normal running fit between tibial plateau pad and the tibial plateau holds in the palm in the sleeve.
Through adopting above-mentioned technical scheme, spacing post passes through the jack plug-in to the sleeve in to realize the normal human natural knee joint motion law that the normal running fit between tibial plateau pad and the tibial plateau holds in the palm.
Preferably, the outer wall of the limiting column and the inner wall of the sleeve are both high polishing surfaces.
Through adopting above-mentioned technical scheme, mainly used reduces the friction.
Preferably, one side that the telescopic one side an organic whole is kept away from to the landing slab is connected with the stopper, and the shin bone platform pad has seted up the spacing groove corresponding to the position of stopper, and the size of spacing groove is greater than the stopper.
Through adopting above-mentioned technical scheme, the setting of stopper and spacing groove mainly plays spacing effect, avoids tibial platform pad pivoted angle too big on tibial platform holds in the palm.
Preferably, an upright post is formed on one side, away from the limiting post, of the tibial platform pad; the femoral condyle prosthesis is provided with an intercondylar groove which is used for accommodating the upright post and is matched with the upright post.
By adopting the technical scheme, the upright post has the limiting effect on the femoral condyle prosthesis mainly in the buckling process.
Preferably, one side of the tibial platform pad, which is far away from the limiting column, is concave to form a curved surface matched with the femoral condyle prosthesis.
Preferably, a cylindrical first joint is fixedly connected to one side, away from the tibial platform pad, of the femoral condyle prosthesis, and the femoral intramedullary pin is in taper fit with the first joint;
one end of the sleeve, which is far away from the platform plate, is formed with a cylindrical second joint, and the tibia broach is in taper fit with the first joint.
Through adopting above-mentioned technical scheme, easy to assemble and change.
Preferably, the side of the deck opposite the tibial deck pad is planar.
Through adopting above-mentioned technical scheme, reduce the tibial plateau pad when rotating and the platform board between the frictional force.
Preferably, one side of the limiting block facing the limiting column is processed with an arc surface matched with the outer wall of the limiting column.
Through adopting above-mentioned technical scheme, reduce the frictional force between the stopper when spacing post rotates.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the knee joint is in normal flexion, the femoral condyle prosthesis and the tibial platform pad can generate relative internal and external rotation, and meanwhile, the left and right rotation with a small amplitude also exists, and the tibial platform pad is in rotating fit with the tibial platform support, so that the femoral condyle prosthesis can drive the tibial platform pad to slightly move in the rotating process, the normal physiological motion of the knee joint can be just met, and the lower surface of the femoral condyle prosthesis and the upper surface of the tibial platform pad are always in a completely matched state;
2. the limiting block and the limiting groove are arranged to mainly play a limiting role, and the phenomenon that the tibial platform pad rotates on the tibial platform support at an overlarge angle is avoided.
Drawings
FIG. 1 is a schematic view of the overall structure of a high confinement type rotary platform knee joint prosthesis according to an embodiment of the present application;
FIG. 2 is an exploded view showing the relationship and specific structure of the femoral broach, femoral condyle prosthesis, tibial plateau pad, tibial plateau holder, and tibial broach;
fig. 3 is an exploded schematic view mainly showing the matching relationship between the limiting block on the tibial plateau tray and the limiting groove on the tibial plateau pad.
Description of reference numerals: 1. a femoral broach; 2. a femoral condyle prosthesis; 21. a first joint; 22. an intercondylar slot; 3. a tibial platform pad; 31. a column; 32. a limiting column; 33. a limiting groove; 4. a tibial plateau tray; 41. a platform plate; 42. a sleeve; 43. a second joint; 44. a limiting block; 5. a tibial medullary needle.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a high-limit type rotary platform knee joint prosthesis. Referring to fig. 1, the high-limit type rotary platform knee joint prosthesis comprises a femoral broach 1, a femoral condyle prosthesis 2, a tibial platform pad 3, a tibial platform support 4 and a tibial broach 5 which are sequentially arranged from top to bottom; the femoral intramedullary nail 1 is connected to the femoral condyle prosthesis 2 and is used for being fixedly installed with a femur; the femoral condyle prosthesis 2 is matched with one side opposite to the tibial platform pad 3; the tibial platform pad 3 is in running fit with the tibial platform support 4; the tibia intramedullary nail 5 is connected to the tibia platform support 4 and is used for being fixedly installed with the tibia.
The femoral broach 1, the tibial broach 5 and the tibial plateau support 4 are made of titanium alloy materials, and the titanium alloy materials have the advantages of high strength and strong corrosion resistance, and can greatly improve the service life of the components; the femoral condyle prosthesis 2 is processed by a cobalt-chromium-molybdenum alloy material, and the cobalt-chromium-molybdenum alloy material has the advantages of wear resistance and corrosion resistance, so that the durability of the femoral condyle prosthesis 2 can be greatly improved; the tibia platform pad 3 is made of an ultra-high molecular weight polyethylene material, and the ultra-high molecular weight polyethylene material has the advantages of wear resistance, impact resistance, corrosion resistance, no toxicity and cracking resistance, is durable, and has safety guarantee.
Referring to fig. 2, the femoral condyle prosthesis 2 is of a C-shaped semi-surrounding structure, a cylindrical first joint 21 is fixedly connected to one side of the femoral condyle prosthesis, which is far away from the tibial platform pad 3, and the femoral broach 1 and the first joint 21 are fixedly connected through the Morse taper principle in an inserting manner, so that the femoral condyle prosthesis is convenient to install and replace. An upright post 31 is formed on one side, facing the femoral condyle prosthesis 2, of the tibial platform pad 3, an intercondylar groove 22 is formed in the position, corresponding to the upright post 31, of the femoral condyle prosthesis 2, the upright post 31 extends into the intercondylar groove 22, and in the buckling process, the upright post 31 plays a limiting role in limiting the femoral condyle prosthesis 2.
The tibia platform pad 3 and the side opposite to the femur condyle prosthesis 2 are concave and form a curved surface matched with the femur condyle prosthesis 2, the matching is completely matched, the structural design is mainly used for improving the forming degree, so that the contact area of the tibia platform pad and the femur condyle prosthesis is increased, the increase of the contact area means that the mechanical stress acting on the tibia platform pad 3 can be distributed on a larger area, and then the contact stress is reduced in proportion.
It should be noted here that the tibial plateau pad 3, machined from polyethylene, can withstand a certain amount of stress applied to its surface, and the polyethylene will break when the stress reaches a limit, referred to as the creep limit of the polyethylene; through the mode that improves the conformity degree in this application, reduce contact stress to the level of inferior creep, improved the life of shin bone platform pad 3 greatly.
Referring to fig. 2, a tapered limiting column 32 is integrally connected to one side of the tibial platform pad 3 away from the upright column 31, and the diameter of the limiting column 32 gradually decreases from one end close to the tibial platform pad 3 to one end away from the tibial platform pad 3; tibial plateau holds in palm 4 including the platform board 41 and integral connection at platform board 41 towards 5 one sides of shin bone broach and with the sleeve 42 of spacing post 32 looks adaptation, platform board 41 and tibial plateau fill up 3 relative one sides and be the plane, the jack has been seted up with the junction of platform board 41 to sleeve 42, spacing post 32 is pegged graft to sleeve 42 in through the jack, thereby realize the normal human nature knee joint motion law between tibial plateau fills up 3 and the tibial plateau holds in the palm 4.
A second cylindrical joint 43 is formed at the end of the sleeve 42 remote from the platform plate 41, and the tibial broach 5 is in taper fit with the first joint 21.
In order to reduce the friction force generated during the relative rotation between the position-limiting column 32 and the sleeve 42, the outer wall of the position-limiting column 32 and the inner wall of the sleeve 42 are processed into highly polished surfaces.
Referring to fig. 3, one side an organic whole that keeps away from sleeve 42 at landing slab 41 is connected with stopper 44, spacing groove 33 has been seted up to tibial plateau pad 3 corresponding stopper 44's position, stopper 44 is located spacing groove 33, the size of spacing groove 33 is greater than stopper 44, and the cambered surface that has and spacing post 32 outer wall looks adaptation is processed towards one side of spacing post 32 at stopper 44, stopper 44 and the setting of spacing groove 33, mainly play spacing effect, avoid tibial plateau pad 3 pivoted angle on tibial plateau holds in the palm 4 too big.
The implementation principle of the embodiment of the application is as follows: when the knee joint is in normal flexion, the femoral condyle prosthesis 2 and the tibial platform pad 3 can generate relative internal and external rotation, and meanwhile, the left and right rotation with a small amplitude also exists, and because the tibial platform pad 3 and the tibial platform support 4 are in rotating fit, the femoral condyle prosthesis 2 can drive the tibial platform pad 3 to slightly move in the rotating process, so that the normal physiological motion of the knee joint can be just met, and the lower surface of the femoral condyle prosthesis 2 and the upper surface of the platform pad are always in a completely matched state; and because the upper surface of the tibial platform support 4 and the lower surface of the tibial platform pad 3 are both planes, the abrasion in the rotating process is greatly reduced.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A high confinement type rotary platform knee joint prosthesis, characterized in that: the tibia platform comprises a tibia platform support (4), a tibia platform pad (3) horizontally rotated on the tibia platform support (4), a tibia broach (5) connected to one side, far away from the tibia platform pad (3), of the tibia platform support (4), a femur condyle prosthesis (2) matched with the tibia platform pad (3) and a femur broach (1) connected to one side, far away from the tibia platform pad (3), of the femur condyle prosthesis (2).
2. The high confinement type rotary platform knee joint prosthesis of claim 1, wherein: a limiting column (32) is formed on one side, away from the femoral condyle prosthesis (2), of the tibial platform pad (3);
tibial plateau holds in palm (4) including platform board (41) and integrated connection in platform board (41) sleeve (42) towards tibial broach (5) one side, and the junction of sleeve (42) and platform board (41) is seted up and is supplied spacing post (32) to insert sleeve (42) in so that between tibial plateau pad (3) and tibial plateau holds in the palm (4) normal running fit's jack.
3. The high confinement type rotary platform knee joint prosthesis of claim 2, wherein: the outer wall of the limiting column (32) and the inner wall of the sleeve (42) are both high polishing surfaces.
4. The high confinement type rotary platform knee joint prosthesis of claim 2, wherein: one side that sleeve (42) were kept away from in landing slab (41) is connected with stopper (44) integratively, and spacing groove (33) have been seted up to shin bone platform pad (3) position that corresponds stopper (44), and the size of spacing groove (33) is greater than stopper (44).
5. The high confinement type rotary platform knee joint prosthesis of claim 2, wherein: an upright column (31) is formed on one side, away from the limiting column (32), of the tibial platform pad (3); the femoral condyle prosthesis (2) is provided with an intercondylar groove (22) which is used for accommodating the upright post (31) and is matched with the upright post (31).
6. The high confinement type rotary platform knee joint prosthesis of claim 2, wherein: one side of the tibia platform pad (3) far away from the limiting column (32) is concave inwards to form a curved surface matched with the femoral condyle prosthesis (2).
7. The high confinement type rotary platform knee joint prosthesis of claim 2, wherein: a cylindrical first joint (21) is fixedly connected to one side, away from the tibia platform pad (3), of the femoral condyle prosthesis (2), and the femoral intramedullary nail (1) is in taper fit with the first joint (21);
one end of the sleeve (42) far away from the platform plate (41) is formed with a cylindrical second joint (43), and the tibia intramedullary nail (5) is in taper fit with the first joint (21).
8. The high confinement type rotary platform knee joint prosthesis of claim 2, wherein: the opposite sides of the platform plate (41) and the tibia platform pad (3) are both planes.
9. The highly constrained rotary platform knee prosthesis of claim 4, wherein: and one side of the limiting block (44) facing the limiting column (32) is processed with an arc surface matched with the outer wall of the limiting column (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021832130.9U CN213283595U (en) | 2020-08-27 | 2020-08-27 | High-limit type rotary platform knee joint prosthesis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021832130.9U CN213283595U (en) | 2020-08-27 | 2020-08-27 | High-limit type rotary platform knee joint prosthesis |
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| CN213283595U true CN213283595U (en) | 2021-05-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111297520A (en) * | 2020-03-23 | 2020-06-19 | 北京市春立正达医疗器械股份有限公司 | Biological type tibial plateau holds in palm and platform pad |
| CN113397768A (en) * | 2021-07-16 | 2021-09-17 | 北京力达康科技有限公司 | Rotary platform knee joint prosthesis |
-
2020
- 2020-08-27 CN CN202021832130.9U patent/CN213283595U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111297520A (en) * | 2020-03-23 | 2020-06-19 | 北京市春立正达医疗器械股份有限公司 | Biological type tibial plateau holds in palm and platform pad |
| CN113397768A (en) * | 2021-07-16 | 2021-09-17 | 北京力达康科技有限公司 | Rotary platform knee joint prosthesis |
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