CN208910596U - Knee-joint prosthesis - Google Patents

Abstract

The utility model provides a kind of knee-joint prosthesis, and knee-joint prosthesis is arranged between femur and shin bone, and knee-joint prosthesis includes: condyle of femur, and the one end of femur close to shin bone is arranged in, and the side of condyle of femur towards shin bone is provided with first surface；Tibial plateau, is arranged in the one end of shin bone close to femur, and the side of tibial plateau towards femur is provided with the second curved surface；Gasket, it is arranged between condyle of femur and tibial plateau, the side of gasket towards femur is provided with the third curved surface matched with first surface, gasket can be moved along first surface relative to condyle of femur, the side of gasket towards shin bone is provided with the 4th curved surface matched with the second curved surface, and gasket can be moved along the second curved surface relative to tibial plateau.The technical solution of the utility model effectively solves the ranges that gasket in the prior art is easy abjection tibial plateau, and then increase the problem of the possibility by art patient injury.

Description

Knee-joint prosthesis

Technical field

The utility model relates to medical instruments fields, in particular to a kind of knee-joint prosthesis.

Background technique

The shin femoral joint inflammation that knee joint single condyle displacement (UKA) is used to treat separate room has had more than 30 years history.To the greatest extent Pipe reporting is ineffective, but has been developed as a kind of safe and reliable treatment method now.Guarantee the treatment of UKA Effect, it is necessary to select case appropriate, consummate operation skill, avoid excessive correction deformity.This method is suitable for limitation Pain, mobility are good, Radiologic imaging is the patient of the shin femoral joint inflammation of single-shot simultaneously.Compared with total knee replacement, UKA Postoperative mobility is bigger, patient satisfaction is higher, and the prosthese survival rate of mid-term is suitable.

(UKA) tibial component of knee joint single condyle displacement at present includes two kinds of major design modes:

Setting-up piece structure, gasket are fixed on tibial plateau, and gasket upper surface is relatively flat, and condyle of femur is padded fixed On piece movement, point contact, contact stress is larger, which is prone to wear, but condyle of femur freedom of movement.

Removable insole pieces prosthese, Oxford is the removable insole pieces prosthese of representative.Movable half a month template prosthese gasket is plastics Polyethylene production, tibial plateau is a flat metab.The upper surface of gasket is concave spherical surface, and shape and condyle of femur are high Degree matching.The lower surface of gasket is plane, can all around be move freely on the tibial plateau surfaces for being equally plane.

The gasket and condyle of femur of above-mentioned removable insole pieces prosthese are easy the range of abjection tibial plateau, increase by art patient injury Possibility.

Utility model content

The utility model is intended to provide a kind of knee-joint prosthesis, is easy abjection tibial plateau to solve gasket in the prior art Range, and then increase by art patient injury possibility problem.

To achieve the goals above, the utility model provides a kind of knee-joint prosthesis, is arranged between femur and shin bone, Include: condyle of femur, the one end of femur close to shin bone is set, the side of condyle of femur towards shin bone is provided with first surface；Shin bone Platform, is arranged in the one end of shin bone close to femur, and the side of tibial plateau towards femur is provided with the second curved surface；Gasket, setting Between condyle of femur and tibial plateau, the side of gasket towards femur is provided with the third curved surface matched with first surface, pad Piece can be moved along first surface relative to condyle of femur, and the side of gasket towards shin bone is provided with the 4th matched with the second curved surface Curved surface, gasket can be moved along the second curved surface relative to tibial plateau.

Further, the second curved surface is concave surface, and the 4th curved surface is convex surface.

Further, stop configurations are provided between tibial plateau and gasket.

Further, stop configurations include stopper posts, and stopper posts are stretched out from tibial plateau towards femur.

Further, stop configurations further include the limiting groove being arranged on gasket, and limiting groove can accommodate stopper posts And it is abutted with stopper posts.

Further, stopper posts are provided with guide surface far from one end of tibial plateau, and guide surface is arranged towards gasket.

Further, guide surface includes the inclined-plane of two conical surfaces of two conical surfaces being oppositely arranged and connection, two conical surfaces Axis is located at the ipsilateral of inclined-plane.

Further, the side of tibial plateau towards shin bone is provided with fixed structure, fixed structure protrude into shin bone with Fixed tibial platform.

Further, fixed structure includes fixed plate and fastener, and fixed plate is extended downwardly from tibial plateau, fixed plate with Shin bone fits, and fastener passes through fixed plate and protrudes into shin bone, and fastener is angularly arranged with tibial plateau.

Further, fastener is multiple, and multiple fasteners are angularly arranged.

Using the technical solution of the utility model, the third curved surface cooperation of the first surface and gasket of condyle of femur, shin bone is flat The cooperation of 4th curved surface of the second curved surface of platform and gasket, the edge and center of curved surface have difference in height, when two it is mutually matched When deviateing between curved surface, under the endogenetic process of two curved surfaces, two curved surfaces have the trend resetted.When two curved surfaces are inclined When bigger from degree, the trend of this reset is stronger, and then keeps the relative position of two structures cooperated by curved surface.It is bent Face cooperation reduces the opposite scope of activities between condyle of femur and gasket and gasket and tibial plateau, thereby reduces and is suffered from by art The possibility that person comes to harm.

Detailed description of the invention

The accompanying drawings constituting a part of this application is used to provide a further understanding of the present invention, this is practical Novel illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model. In the accompanying drawings:

Fig. 1 shows the structural schematic diagram of the embodiment of knee-joint prosthesis according to the present utility model；

Fig. 2 shows the overlooking structure diagrams of the knee-joint prosthesis of Fig. 1；

Fig. 3 shows the A-A of the knee-joint prosthesis of Fig. 2 to schematic cross-sectional view；

Fig. 4 shows the structural schematic diagram of the tibial plateau of the knee-joint prosthesis of Fig. 1；

Fig. 5 shows the left view structural representation of the tibial plateau of Fig. 4；

Fig. 6 shows the schematic view of the front view of the gasket of the knee-joint prosthesis of Fig. 1；And

Fig. 7 shows the left view structural representation of the gasket of Fig. 6.

Wherein, the above drawings include the following reference numerals:

20, tibial plateau；21, the second curved surface；22, fixed column；30, gasket；31, third curved surface；32, the 4th curved surface；40, Stop configurations；41, stopper posts；42, limiting groove；43, guide surface；431, first conical surface；432, second conical surface；433, inclined-plane； 50, fixed structure；51, fixed plate；52, fastener.

Specific embodiment

The knee components of the application are arranged between femur and shin bone, knee joint has in femur medial and lateral condyle and shin bone, External condyle and kneecap are constituted, and are that human body is maximum and construction is most complicated, are damaged the higher joint of chance.Current medical domain needle The treatment method that prosthese replaces primary bone is capable of providing to knee joint problems, knee prosthesis can specifically be divided into single condyle and set It changes, knee joint surface is replaced and hinge type total knee replacement.For the lesion at simple inner or outer side interval, theoretically may be used To select single condyle displacement, i.e., only replace condylus medialis femoris and condylus medialis tibiae or condylus lateralis femoris and condylus lateralis tibiae.At present Knee joint single condyle displacement (UKA) think that relative shifting range between condyle of femur, tibial plateau and gasket has and do not replace The soft tissues such as the musculature of ligament and knee joint peripheral are limited, and the utility model people of the application sends out in actual clinical Existing, ideal situation is not achieved in the postoperative kneed limitation capability of patient.The application is regarding to the issue above to knee-joint prosthesis Structure is improved.

Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Below Description only actually at least one exemplary embodiment be it is illustrative, never as to the application and its application or making Any restrictions.Based on the embodiment in the application, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, shall fall in the protection scope of this application.

It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.

Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments Up to the unlimited scope of the present application processed of formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each portion shown in attached drawing The size divided not is to draw according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation A part of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached It does not need that it is further discussed in figure.

As shown in Figures 1 to 7, the knee-joint prosthesis of the present embodiment includes condyle of femur, tibial plateau 20 and gasket 30.Its In, the one end of femur close to shin bone is arranged in condyle of femur, and the side of condyle of femur towards shin bone is provided with first surface.Tibial plateau 20 are arranged in the one end of shin bone close to femur, and the side of tibial plateau 20 towards femur is provided with the second curved surface 21.Gasket 30 is set It sets between condyle of femur and tibial plateau 20, it is bent that gasket 30 is provided with the third matched with first surface towards the side of femur Face 31, gasket 30 can be moved along first surface relative to condyle of femur；The side of gasket 30 towards shin bone is provided with and the second curved surface 21 the 4th curved surfaces 32 matched, gasket 30 can be moved along the second curved surface 21 relative to tibial plateau 20.

Using the technical solution of the present embodiment, the first surface of condyle of femur and the third curved surface 31 of gasket 30 cooperate, shin bone The 4th curved surface 32 cooperation of the second curved surface 21 and gasket 30 of platform 20, the edge and center of curved surface have difference in height, when two When deviateing between mutually matched curved surface, under the endogenetic process of two curved surfaces, two curved surfaces have the trend resetted.When When two curved surface departure degrees are bigger, the trend of this reset is stronger, and then keeps two structures cooperated by curved surface Relative position.Curved surface cooperation reduces the relatively movable model between condyle of femur and gasket 30 and gasket 30 and tibial plateau 20 It encloses, thereby reduces the possibility to be come to harm by art patient.

Preferably, as depicted in figs. 1 and 2, the third curved surface 31 of the present embodiment is concave spherical surface, and the song of third curved surface 31 Rate is equal with the curvature of the first surface of condyle of femur, so that gasket 30 can be with femur when condyle of femur is mobile relative to tibial plateau 20 The movement of condyle is slided on tibial plateau 20.When condyle of femur is rotated relative to tibial plateau 20, gasket 30 can be along the of condyle of femur One curved surface is mobile.

The knee-joint prosthesis of the present embodiment is single condyle knee-joint prosthesis, and is suitable for entocondyle.Wherein, left in Fig. 2 and Fig. 3 Side towards on the inside of knee joint, right side is towards on the outside of knee joint；Left side is on rear side of knee joint and towards human body rear, right side in Fig. 5 For on front side of knee joint and towards in front of human body；Corresponding with Fig. 5, top be before knee joint rear side, lower section are knee joint in Fig. 2 Side.

As shown in Figures 4 to 7, second curved surface 21 of the present embodiment be concave surface formed slideway, the 4th curved surface 32 be convex surface simultaneously It can be slided in slideway.Slideway can be designed according to human femur under loading condyle with respect to the motion profile of tibial plateau, to meet people Body laws of motion.Second curved surface 21 and the 4th curved surface 32, which match, can play certain position-limiting action, prevent gasket 30 Abjection.Meanwhile traditional plane contact is replaced with convex articular face, contact area is big, is conducive to dispersive stress, reduces abrasion. Specifically as shown in figure 5, there is soft tissue package in kneed front and back, while fore-aft travel range is larger, stroke is longer, the second curved surface Difference in height control between 21 front and rear edge and the center of the second curved surface 21 in 2mm or more, i.e., front side be detached from height t4 >=2mm, Rear side is detached from height t3 >=2mm, is detached from being effectively prevented gasket 30 from the second curved surface 21.

There are soft tissue package, movement to be formed compared to kneed front-rear direction longer, there is intercondylar knot in kneed centre Section etc. has bone tissue limitation left and right directions mobile, and scope of activities is small, stroke is shorter, and it is larger to be detached from risk.Therefore, such as Fig. 1 to Fig. 3 It is shown, stop configurations 40 are provided between the tibial plateau 20 and gasket 30 of the present embodiment.When gasket 30 has beyond tibial plateau When the trend of 20 ranges, stop configurations 40 can provide the active force of reset for gasket 30, and gasket is further prevented to deviate from shin bone The range of platform, avoids gasket 30 from being detached from tibial plateau by unexpected external force, provides protection for patient.

Specifically, as shown in Figure 1 and Figure 4, the stop configurations 40 of the present embodiment include stopper posts 41, and stopper posts 41 are from shin bone Platform 20 is stretched out towards femur.Stopper posts 41 can be abutted with gasket 30 to prevent gasket 30 from continuing to be displaced outwardly.It is closed in view of knee The centre of section has bone tissue to stop, be not easily disconnected from, and the stopper posts 41 of the present embodiment are arranged in kneed outer ledge.With second The front and rear edge of curved surface 21 is similar, between interior outside (or left and right sides) edge of the second curved surface 21 and the center of the second curved surface 21 Difference in height is also controlled in 2mm or more, i.e., inside is detached from height t1 >=2mm, outside is detached from height t2 >=2mm, to be effectively prevented Gasket 30 is detached from from the second curved surface 21.

Further, as shown in figures 1 to 6, the stop configurations 40 of the present embodiment further include the limit being arranged on gasket 30 Position groove 42, limiting groove 42 can accommodate stopper posts 41 and abut with stopper posts 41.Limiting groove 42 avoids stopper posts 41, keeps away Exempting from stopper posts 41 influences the scope of activities of gasket 30, while when stopper posts 41 enter limiting groove 42, limiting groove 42 can The scope of activities of limit stop column 41 further limits the opposite scope of activities between condyle of femur and tibial plateau, mentions for patient For protection.Preferably, the length of the limiting groove 42 of the present embodiment is greater than the width of stopper posts 41, so that stopper posts 41 enter limit Position groove 42 in when can also move along the longitudinal direction, to avoid limiting groove 42 it is too short cause front and back inner wall and meanwhile with stopper posts 41 It offsets, influences kneed scope of activities.

Specifically, as shown in Figures 2 to 4, the stopper posts 41 of the present embodiment are provided with far from one end of tibial plateau 20 leads To face 43, guide surface 43 is arranged towards gasket 30.Guide surface 43 makes stopper posts 41 more swimmingly enter limiting groove 42, reduces limit Touching between the edge of position groove 42 and the edge of stopper posts 41 firmly.

More specifically, as shown in Figures 2 to 5, guide surface 43 includes two conical surfaces of two conical surfaces being oppositely arranged and connection Inclined-plane, the axis of two conical surfaces is located at the ipsilateral of inclined-plane.First conical surface 431, inclined-plane 433 and the combination of second conical surface 432 are formed Guide surface 43 strengthens the guiding role of guide surface 43.And the cross section of the guide surface 43 of the present embodiment is in half of kidney ellipsoid, It is capable of providing certain torque, limits the scope of activities of gasket 30 to a certain extent, provides protection for patient.Preferably, As shown in figure 3, the cone angle of the conical surface and the inclination angle theta on inclined-plane are between 30 ° to 60 °.

As shown in Figure 1, the side of the tibial plateau 20 towards shin bone of the present embodiment is provided with fixed structure 50, fixed structure 50 protrude into shin bone and provide additional stability for tibial plateau 20, with fixed tibial platform 20.

Specifically, as shown in Figures 1 to 5, the fixed structure 50 of the present embodiment includes fixed plate 51 and fastener 52, is fixed Plate 51 is extended downwardly from tibial plateau 20 and is fitted with shin bone, and fastener 52 passes through fixed plate 51 and protrudes into shin bone, is fastened Part 52 is angularly arranged with tibial plateau 20.

In other embodiments, fastener can be also provided with screw thread on head, correspondingly in the screw hole of fixed plate Inner wall on internal screw thread is set, to improve stability.

Further, as shown in Figure 1, the fastener 52 of the present embodiment is two, two fasteners 52 are angularly arranged.

The tibial plateau of the present embodiment further includes fixed column 22, and fixed column 22 is inserted into patient's shin bone with flat to shin bone Platform is positioned, is fixed.

It can be seen from the above description that the above embodiments of the utility model achieve the following technical effects:

The third curved surface cooperation of the first surface and gasket of condyle of femur, the second curved surface of tibial plateau and the 4th song of gasket Face cooperation, the edge and center of curved surface have difference in height, when deviateing between two mutually matched curved surfaces, in two songs Under the endogenetic process in face, two curved surfaces have the trend resetted.When two curved surface departure degrees are bigger, the trend of this reset It is stronger, and then keep the relative position of two structures cooperated by curved surface.Curved surface cooperation reduce condyle of femur and gasket with And the opposite scope of activities between gasket and tibial plateau, thereby reduce the possibility to be come to harm by art patient.

In the description of the present application, it is to be understood that the noun of locality such as " front, rear, top, and bottom, left and right ", " laterally, vertical, Vertically, orientation or positional relationship indicated by level " and " top, bottom " etc. is normally based on orientation or position shown in the drawings and closes System is merely for convenience of description the application and simplifies description, and in the absence of explanation to the contrary, these nouns of locality do not indicate that It must have a particular orientation or be constructed and operated in a specific orientation with the device or element for implying signified, therefore cannot manage Solution is the limitation to the application protection scope；The noun of locality " inside and outside " refers to inside and outside the profile relative to each component itself.

For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ", " ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction " Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and " in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and And respective explanations are made to the opposite description in space used herein above.

In addition, it should be noted that, limiting components using the words such as " first ", " second ", it is only for be convenient for Corresponding components are distinguished, do not have Stated otherwise such as, there is no particular meanings for above-mentioned word, therefore should not be understood as to this Apply for the limitation of protection scope.

The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of knee-joint prosthesis is arranged between femur and shin bone characterized by comprising

The femur is arranged in close to one end of the shin bone in condyle of femur, and the condyle of femur is arranged towards the side of the shin bone There is first surface；

Tibial plateau (20), is arranged in the shin bone close to one end of the femur, and the tibial plateau (20) is towards the stock The side of bone is provided with the second curved surface (21)；

Gasket (30), is arranged between the condyle of femur and the tibial plateau (20), and the gasket (30) is towards the femur Side be provided with the third curved surface (31) matched with the first surface, the gasket (30) can be along the first surface Mobile relative to the condyle of femur, the side of gasket (30) towards the shin bone is provided with to match with second curved surface (21) The 4th curved surface (32) closed, the gasket (30) can be mobile relative to the tibial plateau (20) along second curved surface (21).

2. knee-joint prosthesis according to claim 1, which is characterized in that second curved surface (21) is concave surface, described the Four curved surfaces (32) are convex surface.

3. knee-joint prosthesis according to claim 1, which is characterized in that the tibial plateau (20) and the gasket (30) Between be provided with stop configurations (40).

4. knee-joint prosthesis according to claim 3, which is characterized in that the stop configurations (40) include stopper posts (41), the stopper posts (41) are stretched out from the tibial plateau (20) towards the femur.

5. knee-joint prosthesis according to claim 4, which is characterized in that the stop configurations (40) further include being arranged in institute State the limiting groove (42) on gasket (30), the limiting groove (42) can accommodate the stopper posts (41) and with the backstop Column (41) abuts.

6. knee-joint prosthesis according to claim 4, which is characterized in that the stopper posts (41) are far from the tibial plateau (20) one end is provided with guide surface (43), and the guide surface (43) is arranged towards the gasket (30).

7. knee-joint prosthesis according to claim 6, which is characterized in that the guide surface (43) includes two be oppositely arranged The inclined-plane of two conical surfaces of a conical surface and connection, the axis of two conical surfaces are located at the ipsilateral of the inclined-plane.

8. knee-joint prosthesis according to claim 1, which is characterized in that the tibial plateau (20) is towards the shin bone Side is provided with fixed structure (50), and the fixed structure (50) is protruded into the shin bone with the fixation tibial plateau (20)。

9. knee-joint prosthesis according to claim 8, which is characterized in that the fixed structure (50) includes fixed plate (51) With fastener (52), the fixed plate (51) extends downwardly from the tibial plateau (20), the fixed plate (51) and the shin Bone photo fitting, the fastener (52) pass through the fixed plate (51) and protrude into the shin bone, the fastener (52) and institute Tibial plateau (20) is stated angularly to be arranged.

10. knee-joint prosthesis according to claim 9, which is characterized in that the fastener (52) be it is multiple, it is multiple described Fastener (52) is angularly arranged.