CN220193265U - Tibia plug-in knee joint revision operation of rotary hinge - Google Patents
Tibia plug-in knee joint revision operation of rotary hinge Download PDFInfo
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- CN220193265U CN220193265U CN202320661280.5U CN202320661280U CN220193265U CN 220193265 U CN220193265 U CN 220193265U CN 202320661280 U CN202320661280 U CN 202320661280U CN 220193265 U CN220193265 U CN 220193265U
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- tibial plateau
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- recess
- grooves
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- 210000000629 knee joint Anatomy 0.000 title claims abstract description 27
- 210000002303 tibia Anatomy 0.000 title abstract description 12
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims abstract description 16
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000004132 cross linking Methods 0.000 claims abstract description 3
- 210000003127 knee Anatomy 0.000 claims description 15
- 238000001356 surgical procedure Methods 0.000 claims description 6
- 238000005299 abrasion Methods 0.000 abstract description 7
- 230000002980 postoperative effect Effects 0.000 abstract description 7
- GVJHHUAWPYXKBD-UHFFFAOYSA-N (±)-α-Tocopherol Chemical compound OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 14
- 230000033001 locomotion Effects 0.000 description 10
- 229930003427 Vitamin E Natural products 0.000 description 7
- WIGCFUFOHFEKBI-UHFFFAOYSA-N gamma-tocopherol Natural products CC(C)CCCC(C)CCCC(C)CCCC1CCC2C(C)C(O)C(C)C(C)C2O1 WIGCFUFOHFEKBI-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 229940046009 vitamin E Drugs 0.000 description 7
- 235000019165 vitamin E Nutrition 0.000 description 7
- 239000011709 vitamin E Substances 0.000 description 7
- 206010023204 Joint dislocation Diseases 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 3
- 210000000845 cartilage Anatomy 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 210000003414 extremity Anatomy 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 210000000689 upper leg Anatomy 0.000 description 2
- 208000006820 Arthralgia Diseases 0.000 description 1
- 208000036487 Arthropathies Diseases 0.000 description 1
- 208000035143 Bacterial infection Diseases 0.000 description 1
- 208000037408 Device failure Diseases 0.000 description 1
- 208000012659 Joint disease Diseases 0.000 description 1
- 208000002193 Pain Diseases 0.000 description 1
- 208000037099 Prosthesis Failure Diseases 0.000 description 1
- 241000191963 Staphylococcus epidermidis Species 0.000 description 1
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- 230000004064 dysfunction Effects 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
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Abstract
The utility model relates to a tibia insert in knee joint revision of a rotary hinge. The tibia insert comprises a fastener and a tibia platform pad made of high-crosslinking ultra-high molecular weight polyethylene material, wherein a positioning hole for inserting the fastener is formed in the tibia platform pad; the tibial plateau pad has opposite first and second ends; two grooves are formed on the top surface of the tibial plateau pad, the grooves are respectively positioned on two sides of the positioning hole, and the top surface area in the grooves is formed into a smooth curved surface, wherein the height of the second end is higher than that of the first end; the height of the medial region of the recess is greater than the height of the lateral region of the recess so that the angles of internal rotation and external rotation can reach 30 deg. + -1 deg., respectively, when the femoral condyle is rotated relative to the tibial plateau pad. Therefore, the problems of heavy abrasion of the platform pad, reduced knee joint mobility, low postoperative satisfaction and comfort of patients and easy backward turning dislocation of the femoral condyle in the prior art are solved.
Description
Technical Field
The utility model belongs to the technical field of joint prostheses, and relates to a tibia insert in a rotary hinge knee joint revision operation.
Background
Artificial knee joints are a medical method of treating knee joint disorders. Over time, the post-operative replacement knee joint may wear, loosen the prosthesis, dislocate, etc., resulting in the patient having to remove the prosthesis.
In order to restore knee joint motion and mobility function after primary prosthesis failure, prosthetic revision knee joint surgery is required on the patient's knee. For a revision knee prosthesis, the knee tibial insert (i.e., tibial plateau pad) is an important component thereof.
Cartilage discs are arranged between the femur and the tibia, the cartilage can absorb shock and bear pressure, the cartilage, particularly meniscus, is the most injured part of a human body during movement, and once the joint is damaged, joint pain and dysfunction can be caused. The specific defects are shown in the following aspects:
1. the platform pad wears heavier: the similar products are made of polyethylene, and although the knee joint prosthesis has higher stability in movement, the phenomenon of stress friction can occur in the daily walking process, so that a polyethylene upright post is worn out more quickly, the service life of the prosthesis is shortened, or the platform pad and the femoral condyle prosthesis frequently collide due to eversion and internal rotation of the femoral condyle during movement of the fixed platform prosthesis, so that the platform pad is worn seriously;
2. knee joint mobility decreases: the radian design of the low rotation function limits the rotation motion of the knee joint;
3. patient postoperative satisfaction and comfort were low: the design is single, the model is single, and the matching degree of knee joints of different patients cannot be met, so that the postoperative effect is influenced, the mobility of the knee joints is reduced, and the postoperative satisfaction degree of the patients is low;
4. femoral condyles are easily posteriorly dislocated: the design of the femoral condyle dislocation has unsatisfactory anti-drop effect.
Therefore, aiming at the problems of heavy abrasion of the platform pad, reduced knee joint activity, low postoperative satisfaction and comfort of patients and easy posterior dislocation of the femoral condyles existing in the knee joint tibial insert in the prior art, a more reasonable technical scheme is needed to be provided so as to solve the current technical problem.
Disclosure of Invention
The utility model aims to provide a tibial insert in a rotary hinge knee joint revision surgery, which aims to solve the problems of heavy abrasion of a platform pad, reduced knee joint mobility, low postoperative satisfaction and comfort of a patient and easy posterior dislocation of femoral condyles in the prior art.
In order to achieve the above object, the present utility model provides a tibial insert for use in a swivel hinge knee joint revision surgery, comprising a fastener and a tibial plateau pad made of a high cross-linked ultra-high molecular weight polyethylene material, wherein the tibial plateau pad is provided with a positioning hole for inserting the fastener;
the tibial plateau pad has opposite first and second ends; the top surface of the tibial plateau pad is provided with two grooves which are respectively positioned at two sides of the positioning hole, and the top surface area in the grooves is formed into a smooth curved surface, wherein the height of the second end is higher than that of the first end, so that the curved surface has a gradient along the direction of the second end pointing to the first end; the height of the medial region of the recess is greater than the height of the lateral region of the recess such that the curved surface has a slope in a direction along the medial side of the recess toward the lateral side of the recess such that the angles of internal and external rotation can each reach 30 ° ± 1 ° when the femoral condyle rotates relative to the tibial plateau pad.
In one possible embodiment, the positioning hole is provided as a threaded hole and the fastening element is provided as a screw that is adapted to the threaded hole.
In one possible embodiment, the positioning holes are provided as countersunk holes.
In one possible design, the tibial plateau pad is provided with a relief slot at a first end.
In one possible design, the groove wall of the avoidance groove is a curved surface.
By the technical scheme, based on the material characteristics of the ultra-high molecular weight polyethylene, compared with the traditional tibial plateau pad, the prepared tibial insert has higher wear resistance and higher mechanical property, can reduce the abrasion of the prosthesis and prolong the service life of the prosthesis; the two sides of the stand column of the tibial plateau pad adopt radian design with high rotation function of double-side deep grooves, and are perfectly combined with the radian of the femoral condyle, so that the contact area is increased compared with the traditional tibial plateau pad, the abrasion of the prosthesis is reduced, and the buckling/stretching angle is increased compared with the traditional tibial plateau pad, so that the angle is more than or equal to 135. The internal rotation can reach-30 degrees+/-1 degrees, the external rotation can reach +30 degrees+/-1 degrees, and subluxation caused by moderate buckling instability after knee joint operation is avoided. Ensures the mobility of the prosthesis in the movement of the patient and simultaneously increases the stability after operation and the comfort level of the limb movement.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a tibial insert in a swivel-hinge knee revision procedure according to the present utility model;
fig. 2 is a schematic view of a tibial insert in a swivel-hinge knee revision procedure according to the present utility model from another perspective;
FIG. 3 is a schematic view of a front view of a tibial insert in one embodiment of a swivel-hinge knee revision procedure in accordance with the present utility model;
FIG. 4 is a schematic top view of a tibial insert in one embodiment of a swivel-hinge knee revision provided by the present utility model;
FIG. 5 is a schematic cross-sectional view of a tibial insert in one embodiment of a swivel-hinge knee revision provided by the present utility model;
fig. 6 is a schematic view of a clinical application scenario of a tibial insert in a swivel-hinge knee revision provided by the present utility model under one view angle;
fig. 7 is a schematic view of a clinical application scenario of a tibial insert in a swivel-hinge knee revision procedure provided by the present utility model under another view angle.
In the above figures: the device comprises a 1-fastener, a 2-tibia platform pad, a 201-positioning hole, a 202-groove, a 203-avoiding groove, a 3-femur condyle, a 4-femur straight marrow needle, a 5-femur eccentric marrow needle and a 6-tibia platform support.
Detailed Description
The utility model is further described with reference to the drawings and specific embodiments. The present utility model is not limited to these examples, although they are described in order to assist understanding of the present utility model.
Specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments of the present utility model. This utility model may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
According to embodiments of the present disclosure, a tibial insert in a swivel-hinge knee revision procedure is provided. Figures 1-7 illustrate embodiments of the tibial insert in the swivel hinge knee revision procedure.
Referring to fig. 1 to 7, the tibial insert in the knee joint revision of the swivel hinge comprises a fastener 1 and a tibial plateau pad 2 made of a high-crosslinking ultra-high molecular weight polyethylene material, wherein a positioning hole 201 for inserting the fastener 1 is formed in the tibial plateau pad 2; the tibial plateau 2 has opposite first and second ends; two grooves 202 are formed on the top surface of the tibial plateau pad 2, the grooves 202 are respectively positioned on two sides of the positioning hole 201, and the top surface area in the grooves 202 is formed into a smooth curved surface, wherein the height of the second end is higher than that of the first end, so that the curved surface has a gradient along the direction of the second end pointing to the first end; the height of the medial region of the recess 202 is greater than the height of the lateral region of the recess 202 such that the curved surface slopes in a direction that is medial to the recess 202 so that the angles of internal and external rotation, respectively, can reach 30 deg. + -1 deg. when the femoral condyle 3 is rotated relative to the tibial plateau 2.
By the technical scheme, based on the material characteristics of the ultra-high molecular weight polyethylene, compared with the traditional tibial plateau pad 2, the prepared tibial insert has higher wear resistance and higher mechanical property, can reduce the abrasion of the prosthesis and prolong the service life of the prosthesis; the radian design of high rotation function of the double-side deep grooves 202 is adopted on two sides of the stand column of the tibial plateau pad 2, the radian design is perfectly combined with the radian of the femoral condyle 3, the contact area is increased compared with the traditional tibial plateau pad 2, so that the abrasion of a prosthesis is reduced, and the buckling/stretching angle is increased compared with the traditional tibial plateau pad 2, so that the buckling/stretching angle is more than or equal to 135. The internal rotation/external rotation can reach-30 degrees plus or minus 1 degree to +30 degrees plus or minus 1 degree, and subluxation caused by moderate buckling instability after knee joint operation is avoided. Ensures the mobility of the prosthesis in the movement of the patient and simultaneously increases the stability after operation and the comfort level of the limb movement.
In the present disclosure, "inner" and "outer" refer to the inner and outer sides of the contour of the component, specifically, the center or inner side of the component is "inner" and the edge or outer side of the component is "outer". For example, in this context, the area inside the recess 202 refers to the area close to the positioning hole 201. The area outside the recess 202 refers to the area along the distance from the positioning hole 201.
It is to be understood that the ordinal numbers "first", "second", etc., used herein are merely for distinguishing one feature from another, and are not of importance or order, and are not to be construed as limiting the technical features.
The tibia insert is simple in structure, and the best matched prosthesis can be installed according to the ligament function and the bone size of a patient, so that the tibia insert is more suitable for bones. The high matching degree of the prosthesis and the human skeleton can strengthen the stability of the prosthesis after operation and prolong the service life of the prosthesis, thereby improving the satisfaction degree of patients. The femur condyle 3 is matched with a locking mechanism designed by the tibia platform pad 2 and the tibia platform support 6 to provide a maximum jump height of 40 mm, so that subluxation caused by moderate buckling instability after knee joint operation is avoided. Ensures the stability of the prosthesis in the movement of the patient and avoids the pain caused by the secondary operation of the patient due to dislocation of the prosthesis.
Specifically, in the present disclosure, the material used for the tibial plateau pad 2 is vitamin E high cross-linked ultra-high molecular weight polyethylene.
The vitamin E is fused into the ultra-high molecular weight polyethylene in the synthesis mode of the vitamin E stable cross-linked ultra-high molecular weight polyethylene, and the preparation mode is the prior art, so that redundant description is omitted here.
The principle of action of vitamin E as an oxidant is double, so that not only can the oxidation resistance of the ultra-high molecular weight polyethylene after irradiation be improved, but also the fatigue resistance of the ultra-high molecular weight polyethylene can be improved, the vitamin E can be combined with free radicals, and the oxidation rate of the ultra-high molecular weight polyethylene is reduced, so that the aim of protecting the ultra-high molecular weight polyethylene is fulfilled. In high temperature or high purity oxygen, vitamin E stabilized crosslinked ultra-high molecular weight polyethylene may instead be more stable than ultra-high molecular weight polyethylene after gamma sterilization or high dose irradiation.
Scientific researchers observe by utilizing staphylococcus epidermidis, the vitamin E stable cross-linked ultra-high molecular weight polyethylene has the capability of reducing bacterial chemotaxis, can improve the capability of resisting bacterial infection of joint prostheses, and prolongs the long-term survival rate of the prostheses. The manufactured tibial plateau pad 2 has the wear rate of (5.62+/-0.53) mg/million times, and compared with the traditional plateau pad, the tibial plateau pad 2 disclosed by the utility model can delay the aging process of the joint prosthesis material, reduce the wear of the prosthesis material, and further prolong the service life of the prosthesis material.
In one embodiment, the locating hole 201 is configured as a threaded hole and the fastener 1 is configured as a screw that mates with the threaded hole, such that the screw may be threadably secured to the tibial plateau pad 2 to facilitate installation of the prosthesis.
Specifically, the positioning hole 201 is configured as a counter-sunk hole, thereby hiding the visor of the fastener 1 from affecting other femoral condyles 3.
In one embodiment provided by the present disclosure, the tibial plateau 2 is provided with a relief slot 203 at a first end that is beneficial for easier installation on bone and thus better adaptation to the patient's knee joint.
In particular, the slot walls of the relief slot 203 are curved, which is beneficial for better adapting the tibial plateau 2 to the patient's knee joint.
Referring to fig. 6 and 7, in clinical application, the tibial plateau pad 2 is disposed on the tibial plateau support 6, and the fastener 1 (i.e. long screw) is inserted into the positioning hole 201 of the tibial plateau pad 2 and then connected to the tibial plateau support 6. The femoral straight pin 4 is connected to the femoral condyle 3 and the femoral condyle 3 is located above the tibial plateau 2 to be able to fit the recess 202 of the tibial plateau 2. It should be noted that, the proper femoral straight pin 4 and femoral eccentric pin 5 db may be selected for positioning and connection according to the size of the medullary cavity of the patient during the operation. The present disclosure is described herein in a simplified context of a tibial insert and is not intended to limit the structure of a tibial insert.
It should be noted that the present utility model is not limited to the above alternative embodiments, and any person can obtain other various forms of products under the teaching of the present utility model. The above detailed description should not be construed as limiting the scope of the utility model, which is defined in the claims and the description may be used to interpret the claims.
Claims (5)
1. The tibial insert in the knee joint revision of the swivel hinge is characterized by comprising a fastener (1) and a tibial plateau pad (2) made of a high-crosslinking ultra-high molecular weight polyethylene material, wherein a positioning hole (201) for inserting the fastener (1) is formed in the tibial plateau pad (2);
the tibial plateau pad (2) has opposite first and second ends; the top surface of the tibial plateau pad (2) is provided with two grooves (202), the grooves (202) are respectively positioned at two sides of the positioning hole (201), and the top surface area in the grooves (202) is formed into a smooth curved surface, wherein the height of the second end is higher than that of the first end, so that the curved surface has a gradient along the direction of the second end pointing to the first end; the height of the medial region of the recess (202) is greater than the height of the lateral region of the recess (202) such that the curved surface has a slope in the direction of the medial side of the recess (202) towards the lateral side of the recess (202) such that the angles of internal and external rotation can reach 30 deg. + -1 deg., respectively, when the femoral condyle (3) rotates relative to the tibial plateau (2).
2. Tibial insert in swivel-hinge knee revision surgery according to claim 1, characterized in that the positioning hole (201) is provided as a threaded hole and the fastener (1) is provided as a screw adapted to the threaded hole.
3. Tibial insert in a swivel-hinge knee revision surgery according to claim 1, characterized in that the positioning hole (201) is provided as a counter-sunk hole.
4. The tibial insert of the rotational hinge knee revision surgery of claim 1, wherein the first end of the tibial plateau pad (2) is provided with a relief slot (203).
5. The tibial insert of claim 4, wherein the slot wall of said relief slot (203) is curved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320661280.5U CN220193265U (en) | 2023-03-29 | 2023-03-29 | Tibia plug-in knee joint revision operation of rotary hinge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320661280.5U CN220193265U (en) | 2023-03-29 | 2023-03-29 | Tibia plug-in knee joint revision operation of rotary hinge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220193265U true CN220193265U (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320661280.5U Active CN220193265U (en) | 2023-03-29 | 2023-03-29 | Tibia plug-in knee joint revision operation of rotary hinge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220193265U (en) |
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2023
- 2023-03-29 CN CN202320661280.5U patent/CN220193265U/en active Active
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