CN218279888U

CN218279888U - Knee joint prosthesis capable of realizing axial and longitudinal rotation

Info

Publication number: CN218279888U
Application number: CN202221571340.6U
Authority: CN
Inventors: 郭凤达; 岳术俊; 许奎雪; 史春生; 荀世界; 董浩; 魏章利
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2023-01-13
Anticipated expiration: 2032-06-22

Abstract

The utility model discloses a can realize axial and vertical rotatory knee joint prosthesis belongs to medical prosthesis technical field. The prosthesis comprises a femoral condyle, a platform head and a platform pad, wherein the femoral condyle comprises a forked joint which is connected to the bottom end of an osteotomy section; the platform head is positioned between the two branches of the forked joint and is connected with the two branches through bearings; a section of fan-blade-shaped bulge extends downwards from the bottom of the platform head, a groove is formed in the upper surface of the platform pad, and the platform pad and the platform head are connected through the matching of the groove and the bulge; the projection has a rotational degree of freedom within the recess. The utility model can not damage the bone of the patient when completing the flexion and extension and the rotation.

Description

Knee joint prosthesis capable of realizing axial and longitudinal rotation

Technical Field

The utility model relates to medical false body technical field, in particular to a knee joint false body capable of realizing axial and longitudinal rotation.

Background

After the prosthesis in the prior art is implanted, the epiphyseal line of children is damaged, so that bones cannot grow and develop, and adult bones are damaged. When the extension handle of the prosthesis is assembled with the first installation part, the diameter of the first installation part is small, and the root of the first installation part is easy to break after the prosthesis is stressed. The maximum number of the prosthesis extension handles is two, and the number and the position placing have limitations. The prosthesis of the knee joint cannot adjust the osteotomy length and cannot realize rapid supply.

The upper end of the prosthesis platform pad in the prior art can not be connected with the femoral condyle, and can not realize longitudinal rotation. After the prosthesis is installed, the prosthesis is not stably contacted with the femoral condyle of a patient and is easy to dislocate. Without the femoral condyle part, the prosthesis can cause the original femoral condyle of a patient to be worn after being installed, and the damage and the influence are generated on the bone of the prosthesis.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a knee joint prosthesis capable of axial and longitudinal rotation. The knee joint prosthesis can not damage the bone of a patient when completing flexion and extension and rotation movements.

In order to realize the purpose, the utility model discloses the technical scheme who takes does:

a knee joint prosthesis capable of realizing axial and longitudinal rotation comprises a femoral condyle and a platform head, and further comprises a platform pad, wherein the femoral condyle comprises a forked joint which is connected to the bottom end of an osteotomy section; the platform head is positioned between the two branches of the forked joint and is connected with the two branches through bearings; a section of fan-blade-shaped bulge extends downwards from the bottom of the platform head, a groove is formed in the upper surface of the platform pad, and the platform pad and the platform head are connected through the matching of the groove and the bulge; the projection has a rotational degree of freedom within the recess.

Furthermore, the lower surface of the platform pad is provided with at least one long and short spine, and the long spine is positioned in the middle of the lower surface of the platform pad.

Furthermore, the diameter and the length of the large and long spikes are larger than those of the small and long spikes.

Furthermore, the device also comprises a compression screw and a middle shaft; through holes are formed in the two branches of the forked joint, and the central axes of the two through holes are overlapped; the tail end of the middle shaft penetrates through the two through holes and the platform head and is in threaded connection with the compression screw.

Further, the device also comprises a first middle shaft pad and a second middle shaft pad; the platform head is provided with a through hole used for being connected with a middle shaft, and the middle shaft penetrates through the through hole; the first middle shaft pad and the second middle shaft pad are both annular sleeves and are positioned between the outer wall of the middle shaft and the inner wall of the through hole.

Furthermore, the top of the osteotomy segment is a cone matching head which can be matched with the broach according to the length of the osteotomy of the patient for use.

Furthermore, the large and long spikes and the platform pad are integrally formed.

Furthermore, the protrusions and the grooves are of an axisymmetric structure.

The utility model adopts the beneficial effects of the above technical scheme to produce lie in:

1. the extension handle of the prosthesis in the prior art is large in diameter and smooth at the tail end, when the prosthesis is installed, a drill must be used for drilling the bone of a patient in advance, so that the prosthesis can be installed, the bone of the patient is undoubtedly damaged greatly, epiphyseal lines of children can be damaged, irreversible damage is brought to the growth of the bone of the children in the future, damage to the bone of the adults can be increased, and postoperative sequelae are increased. The utility model discloses in used long spine to replace prior art's extension handle, its top portion is the spine shape, need not lean on the apparatus to punch on the sclerotin in advance in the art, can not destroy children's epiphyseal line promptly, can not bring the injury to children's sclerotin and growth in the future, reduce children and adult postoperative discomfort.

2. The utility model discloses the last long spine of well false body processes together and goes out with the platform pad, does not rely on the matched stack form to install, after implanting the human body, the risk that neither can appear droing makes long spine intensity can obtain guaranteeing again.

3. The middle prosthesis of the utility model is not limited by any, and the long spine can be selectively used according to the bone condition of the patient in terms of position, length and quantity.

4. The utility model provides a prosthetic femur passes through the axis with the shin bone and is connected, accomplishes horizontal rotary motion, through the fan structure, accomplishes fore-and-aft rotary motion, and they cooperate the use, accomplish people's shank function.

5. The utility model discloses well false body top part is the matched stack formula, and the selection that different osteotomy positions were accomplished to the different osteotomy sections of accessible matched stack or broach, and osteotomy section and broach all have the finished product, cut the difference of bone position according to the patient, can directly choose for use, need not reprocess, realize supplying goods at once.

6. The utility model provides a false body thighbone condyle 07 is connected through axis 05 with platform head 04, can not have the dislocation risk.

7. The utility model discloses in the design have bionical type thighbone condyle 07, be connected with platform head 04 through axis 05, accomplish the thighbone and be connected of shin bone, can not bring the destruction to patient's sclerotin when accomplishing to bend and stretch with rotary motion.

Drawings

Fig. 1 is an exploded view of the structure installation of the embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an embodiment of the present invention.

Fig. 3 is a schematic front structural view of a platform head according to an embodiment of the present invention.

Fig. 4 is a schematic side view of the platform head according to the embodiment of the present invention.

Fig. 5 is a bottom view of the platform head according to an embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view of a protrusion according to an embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view of a groove according to an embodiment of the present invention.

Fig. 8 is a schematic view of the protrusion and the groove of the present invention.

In the figure: 01. the femoral condyle fracture reduction device comprises a flat head pad 02, a first middle shaft pad 03, a second middle shaft pad 04, a flat head 05, a middle shaft 06, a compression screw 07, a femoral condyle 4-1, a protrusion 1-1 and a groove.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

A knee joint prosthesis capable of realizing axial and longitudinal rotation comprises a femoral condyle and a platform head, and further comprises a platform pad, wherein the femoral condyle comprises a forked joint which is connected to the bottom end of an osteotomy section; the platform head is positioned between the two branches of the forked joint and is connected with the two branches through bearings; a section of fan-shaped bulge extends downwards from the bottom of the platform head, a groove is formed in the upper surface of the platform pad, and the platform pad and the platform head are connected through the matching of the groove and the bulge; the projection has a rotational degree of freedom within the recess.

Furthermore, the lower surface of the platform pad is provided with at least one long and large spine and a plurality of short and small spines, and the long and large spine is positioned in the middle of the lower surface of the plane.

Furthermore, the diameter and the length of the long and large spikes are larger than those of the short and small spikes.

Furthermore, the long and large spines and the platform pad are integrally formed.

Furthermore, the protrusions and the grooves are in an axisymmetric structure.

The following is a more specific example:

referring to fig. 1 and 8, the present embodiment mainly includes seven parts, namely, a platform pad 01, a first middle shaft pad 02, a second middle shaft pad 03, a platform head 04, a middle shaft 05, a compression screw 06, and a femoral condyle 07.

Wherein platform pad 01, it is according to shin bone plane profile modeling design, the appearance has different models, can be big or small, not only can satisfy children's use, also can satisfy adult's use, set up a plurality of short and small spine below platform pad 01, short and small spine can directly prick into the sclerotin on the bone that does not have defect on the one hand, can play the anti-spin effect of product, make the product more stable, on the other hand has defect sclerotin, short and small spine can play the effect of cushion, prevent that the platform pad from sinking, short and small spine also can change anomalous shape, accomplish the filling to defect sclerotin. One or more long and large spines are distributed in the middle of the platform pad, the positions, the lengths and the number of the spines are matched according to the bone condition of a patient, two spines on the platform pad and the platform pad are processed together and are not presented by the matching form, so that the root diameter strength of the two spines can be ensured. After the implant is implanted into a human body at a later stage, the quality of the product can be ensured. The top part of the long spine is in the shape of the spine, so that the epiphyseal line of the child cannot be damaged without punching holes on the sclerotin by an instrument in advance, the sclerotin of the child cannot be damaged, the growth of the child in the future cannot be injured, and the discomfort of the child after the operation is reduced. For adults, the prosthesis can reduce the damage to bone and reduce the trauma to patients compared with the prosthesis on the market.

The platform head 04 is hollow in the middle part, a middle shaft pad 02 and a middle shaft pad 03 are sleeved in the platform head, and are connected with a femur condyle 07 through a middle shaft 05 and a compression screw 06, so that the femur and the tibia of a person complete stress conduction through the structure, the platform head 04 completes transverse rotation movement through the middle shaft 05, namely, flexion and extension movement of the person is met, a fan structure extends out of the lower part of the platform head 04, fan blades on two sides of a middle cylinder are designed to be just matched with a groove in the middle of the platform pad 01, so that longitudinal rotation movement of the femur and the tibia is completed, the upper side is connected with the femur condyle, the lower side is connected with the tibia, the femur and the tibia can complete rotation of 30 degrees on one side and rotate 60 degrees on the two sides under the driving of muscles, and various high-difficulty actions of the person, such as leg coiling action and the like can be met. The product not only can simultaneously meet the requirements of transverse rotation and longitudinal rotation, but also can complete the connection and stress conduction of the femur and tibia.

The femur condyle 07 is a prosthesis made according to the physiological radian of human bone, can match the activity requirements of patients, selects femur condyles 07 with different sizes according to the different ages of the patients, selects osteotomy segments and medullary needles with different models according to the osteotomy lengths of the patients for assembly, and also can select cone fittings with different diameters according to the diameters of the bones of the patients to meet the requirements in operation.

The connection of the upper portion of the femoral condyle 07, whether internal or external, is configured with osteotomy segments or medullary needles of different diameters.

1. The contoured design of the femoral condyle 07 is not limited to this embodiment, and any structure that can be connected to the tibial prosthesis is within the design of the present invention.

3. The overall dimensions of the platform pad 01 are not limited to this embodiment and can be custom designed according to the actual tibial condition.

4. The number, length and position of the spikes on the lower portion of the platform pad 01 are not limited to the embodiment, and the design can be adjusted according to the actual bone condition.

5. The connection form of the platform pad 01 and the platform head 04 is not limited to this embodiment, and the structure for connecting the femur and the tibia to complete the transverse and longitudinal rotation is included in the design of the present invention.

The upper part of the prosthesis is assembled, different osteotomy positions can be selected by assembling different osteotomy segments or the broach, and various surgical schemes can be provided for use. The osteotomy segment and the broach are provided with finished products, can be directly selected according to different osteotomy positions of patients, do not need to be processed again, and realize immediate delivery.

The appearance of the prosthesis platform pad 01 is designed according to the plane shape of a tibia, the bone contour is perfectly fitted, a spine structure is designed below the prosthesis platform pad, the number, the length and the position of the spine are designed according to the real situation, and the stability of the prosthesis is improved.

The platform pad 01 and the platform head 04 are combined, so that the patient can not only finish the transverse rotation of the femur and the tibia, but also finish the longitudinal rotation, the complex actions of the leg of the patient can be met, and the leg function of the patient can be recovered.

The spine below the platform pad 01 is integrally processed with the platform pad 01, the root strength of the spine is greatly improved when the spine is used, the tail end of the spine is designed into a pointed cone shape, instruments are not needed to drill holes in bone in advance when the spine is installed, the bone epiphysis line of children and the bone of adults are prevented from being damaged, and surgical wounds are reduced.

The top end part of the long spine below the platform pad 01 is in the shape of the spine, so that the epiphyseal line of the child cannot be damaged without punching the bone by an instrument in advance, the bone of the child cannot be damaged, the child can not grow in the future, and the discomfort of the child after the operation is reduced. For adults, the bone can not be damaged, and the trauma to patients is reduced.

The platform pad 01, the platform head 04 and the femoral condyle 07 are assembled and connected, the middle part is assembled by the middle shaft 05, and after the prosthesis is replaced, the risk of dislocation cannot occur when the femur and the tibia are connected by the prosthesis during movement.

Claims

1. A knee joint prosthesis capable of realizing axial and longitudinal rotation comprises a femoral condyle and a platform head, and is characterized by further comprising a platform pad, wherein the femoral condyle comprises a forked joint which is connected to the bottom end of an osteotomy section; the platform head is positioned between the two branches of the forked joint and is connected with the two branches through bearings; a section of fan-blade-shaped bulge extends downwards from the bottom of the platform head, a groove is formed in the upper surface of the platform pad, and the platform pad and the platform head are connected through the matching of the groove and the bulge; the projection has a rotational degree of freedom within the recess.

2. The knee joint prosthesis capable of realizing axial and longitudinal rotation according to claim 1, wherein the lower surface of the platform pad is provided with at least one long and long spine and a plurality of short and long spines, and the long and long spine is positioned in the middle of the lower surface of the platform pad.

3. The knee joint prosthesis capable of achieving axial and longitudinal rotation of claim 2, wherein the large long spikes are larger in diameter and length than the small long spikes.

4. The knee joint prosthesis capable of achieving axial and longitudinal rotation according to claim 1, further comprising a compression screw and a central shaft; through holes are formed in the two branches of the forked joint, and the central axes of the two through holes are overlapped; the tail end of the middle shaft penetrates through the two through holes and the platform head and is in threaded connection with the compression screw.

5. The knee joint prosthesis capable of axial and longitudinal rotation of claim 1, further comprising a first medial bearing pad and a second medial bearing pad; the platform head is provided with a through hole used for being connected with a middle shaft, and the middle shaft penetrates through the through hole; the first middle shaft pad and the second middle shaft pad are both annular sleeves and are positioned between the outer wall of the middle shaft and the inner wall of the through hole.

6. The knee joint prosthesis capable of achieving axial and longitudinal rotation of claim 1, wherein the top of the osteotomy segment is a conical head, which can be used in combination with a broach according to the length of the patient's osteotomy.

7. The knee joint prosthesis capable of achieving axial and longitudinal rotation of claim 3, wherein the long spine is integrally formed with the platform pad.

8. The knee joint prosthesis capable of achieving axial and longitudinal rotation of claim 1, wherein the protrusions and the grooves are axially symmetric structures.