CN201404314Y - Improved structure of orthopedic implant - Google Patents

Abstract

The utility model relates to an orthopedic implant structural improvement, include: a tibial base, a tibial articular surface pad, and a reinforcing component. The tibia base is provided with a concave part, the center of the bottom surface of the concave part is provided with a through hole which penetrates through the tibia base, and the upper edge of the through hole extends outwards to form a groove; the bottom of the tibia joint surface gasket is provided with a convex part corresponding to the concave part of the tibia base so as to be pressed and buckled on the tibia base, the center above the tibia joint surface gasket is provided with a support column, the support column is provided with a through hole penetrating through the tibia joint surface gasket, and the tibia joint surface gasket is provided with two curved surfaces at two sides of the support column so as to be contacted and rolled; the reinforcing part is arranged in the tibia joint surface gasket and is formed by combining a bushing and a screw. Therefore, the utility model has the advantages of firm combination, external force resistance, deformation prevention, prolonged service life, improved operation efficiency, safe and convenient use and reduced cost.

Description

Structural Modification of Orthopedic Implants

technical field

The utility model relates to a structural improvement of an orthopedic implant, in particular to a special design of a reinforcement, which increases the tibial articular surface pad and the tibial base in a stable combination, so as to resist external force, prevent deformation and prolong It is suitable for severe bone damage or secondary artificial knee replacement surgery.

Background technique

As people grow older, human joints will wear or degenerate due to degeneration or long-term use, resulting in pain or inability to provide good motor functions, which will affect daily activities. When the joint disease is severe, artificial knee replacement surgery can relieve pain and improve joint function. An artificial knee usually consists of a metal or plastic element that attaches to the bone and replaces the original knee joint, restoring it to normal function.

Artificial knee replacement surgery is a common surgical method to treat degeneration or disease of the knee joint. Typical artificial knee components include a femoral end implant, tibial base, tibial articular liner, and patella implant. The tibial base is fixed on the patient's tibial articular surface, and the tibial articular liner is mechanically combined with the tibial base. The stability of the knee joint is closely related to the design of the femoral implant-tibial articular liner and the tibial articular liner-tibial base. The strut above the tibial articular liner can limit the movement between the femoral end implant and the tibial articular liner, but it is usually made of plastic material, which will be damaged due to long-term resistance to external forces. During activities of daily living, loads and shear forces acting on the artificial knee joint, especially the tibial articular liner, will cause displacement between the tibial articular liner and the tibial base, and may even cause the tibial articular surface The liner is separated from the tibial base. Therefore, it is important and necessary for the strut above the tibial articular liner to have sufficient mechanical strength and a good combination between the tibial articular liner and the tibial base.

Inserting L-shaped reinforcements into the tibial articular liner is a common way to increase the mechanical strength of the struts above the tibial articular liner. Because metal objects are built into the struts above the tibial articular liner, it can increase its mechanical strength against external forces, but This design only increases the stability between the tibial articular liner and the femoral implant. The common method of combining the tibial articular liner and the tibial base is to use screws to lock the two components, and this method can only increase the bonding force of the two, but cannot increase its ability to resist shear force. In addition, the design that the screws are separated from the tibial articular surface pad and assembled only when used reduces the operation efficiency.

Therefore, a well-designed artificial knee joint should have: 1. It can provide the necessary stability during the knee joint movement, reducing unnecessary movements or joint dislocations; 2. It can provide sufficient strength to resist external forces; 3. It can avoid implants. The phenomenon of excessive wear is generated to prolong the service life of the implant. Fourth, the operation efficiency can be improved and the operation time can be saved.

The reason is that the inventors of this utility model feel that the above-mentioned problems can be improved, so they devote themselves to research and cooperate with the application of theories, and then propose a utility model with reasonable design and effective improvement of the above-mentioned problems.

Utility model content

The main purpose of this utility model is to provide an improved orthopedic implant structure. A reinforcing member is arranged in a tibial articular surface liner, and the screw of the reinforcing member is locked downward to a bone stem or a bone stem eccentric piece, and at the same time The bushing of the interlocking reinforcement is exposed below the tibial articular surface pad and fits into the groove of the tibial base, so as to have the effects of stable combination, resistance to external force, prevention of deformation and prolonging the service life, thereby increasing the practicability and reliability of the utility model. progressive.

The second purpose of the present utility model is to provide an improved orthopedic implant structure. The reinforcement is directly arranged in the perforation of the tibial articular surface liner, and the perforation is narrow at the top and wide at the bottom. The outer edge of the bushing is provided with a thread or a special design of a rough surface, so as to improve operation efficiency, use safety and secure combination, thereby increasing the progress and safety of the utility model.

Another purpose of this utility model is to provide an improved orthopedic implant structure, which is suitable for different individuals through the modular design of each component, and can be partially replaced, so as to have the effect of convenient use and cost reduction , and then increase the practicality and convenience of the utility model.

To achieve the above purpose, the structural improvement of the orthopedic implant of the present invention includes a tibial base, a tibial articular liner and a reinforcement. The tibial base has a recess, the center of the bottom surface of the recess is provided with a through hole through the tibial base, the upper edge of the through hole extends outward to form a groove, and one side of the recess is provided with a buckle groove; the tibial articular lining The bottom of the pad corresponds to the concave part of the tibial base to form a convex part to press and fasten on the tibial base, and one side of the convex part is provided with a fastener, which is buckled in the buckle groove of the tibial base. And the upper center of the tibial articular surface pad is provided with a pillar, which is provided with a perforation that runs through the tibial articular surface pad, and the tibial articular surface pad has two curved surfaces on both sides of the pillar for contact and rolling; the reinforcement is set In the tibial articular liner, and the reinforcement is composed of a bushing and a screw, wherein the bushing is fitted into the perforation of the tibial articular liner, and there is a set of The bottom of the casing hole is provided with a stopper, so that after the screw is inserted into the bushing, the screw body is exposed from the casing hole, and the screw head fits against the stopper.

Therefore, the structure improvement of the orthopedic implant of the present invention has the effects of firm combination, stress resistance, deformation prevention, prolonging service life and safe use, and indeed has practicability, progress, safety and convenience.

Description of drawings

In order to further understand the features, characteristics and technical content of the present utility model, please refer to the following detailed description and accompanying drawings of the present utility model, but the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present utility model, wherein:

Fig. 1 is a perspective view of an embodiment of the utility model.

Fig. 2 is an exploded view of the components of the embodiment of the present invention.

Fig. 3 is a partial cross-sectional schematic diagram of an embodiment of the utility model.

Fig. 4 is a combined schematic diagram of the embodiment of the utility model.

Fig. 5 is a schematic diagram of the use state of the embodiment of the utility model.

Detailed ways

Please refer to FIGS. 1 to 3 , which are perspective views, component exploded views and cross-sectional schematic views of an embodiment of the present invention. The structural improvement of the orthopedic implant includes: a tibial base 1 , a tibial joint surface liner 2 and a reinforcement 3 .

The tibial base is a modular design with various sizes, and it has a recess 11. The center of the bottom surface of the recess 11 is provided with a through hole 12 that runs through the tibial base 1. The upper edge of the through hole 12 extends outward to form a groove 13, and the bottom of the through hole 12 is to engage a bone handle 4 (see Figure 5) or a bone handle eccentric part (not shown), and the angle design between the through hole 12 and one end of the bone handle 4 or the bone handle eccentric part is adopted Morse taper (Morse Taper), and one side of the concave portion 11 is provided with a buckle groove 14 for buckle combination.

The tibial articular surface liner 2 is a modular design with multiple sizes, and its bottom is formed with a convex portion 21 corresponding to the concave portion 11 of the tibial base 1 (one side of the concave portion 11 of the tibial base 1 in this embodiment forms a dovetail arc-shaped, so one side of the convex portion 21 also forms a dovetail arc-shaped relatively), to press and fasten on the tibial base 1, and one side of the convex portion 21 is provided with a fastener 22, the fastener 22 It is buckled in the buckle groove 14 of the tibial base 1, and a pillar 23 is provided in the center above the tibial articular surface pad 2 to protrude from the femoral implant 5 (see Figure 5) to form a femoral implant The object 5 moves relatively on the tibial articular surface pad 2, and the pillar 23 is provided with a perforation 24 that runs through the tibial articular surface pad 2. The perforation 24 is narrow at the top and wide at the bottom, and the tibial articular surface pad 2 There are two curved surfaces 25, 26 on both sides of the pillar 23 (the surfaces of the two curved surfaces 25, 26 are smooth arc surfaces to reduce stress concentration and wear of the tibial articular surface pad 2) to provide contact and rolling of the femoral implant 5 .

The reinforcement 3 is set in the tibial articular pad 2, and the reinforcement 3 is composed of a bushing 31 and a screw 32, wherein the bushing 31 is fitted in the tibial articular pad 2 (the outer edge of the bushing 31 in this embodiment is provided with threads or rough surfaces (not shown) to increase the fastening between the bushing 31 and the tibial articular surface pad 2), and the lining There is a set of holes 311 in the sleeve 31, and a stop portion 312 is provided at the bottom of the sleeve hole 311, so that after the screw 32 is inserted into the sleeve 31, the screw body 322 is exposed from the sleeve hole 311, and the screw head 321 is suitable for the stop part 312, and because the perforation 24 is narrow at the top and wide at the bottom, once the screw 32 loosens or breaks, it will not fall out of the tibial articular surface pad 2, causing danger or infection.

When in use, please refer to Fig. 4 to Fig. 5, which are a combined schematic diagram and a schematic diagram of the use state of the utility model embodiment, and the tibial articular surface liner 2 is pressed and combined on the tibial base 1 (the tibial articular surface of the present embodiment After the liner 2 is formed, the reinforcement 3 has been fitted into the tibial articular surface liner 2), because the convex part 21 of the tibial articular surface liner 2 and the concave part 11 of the tibial base 1 are formed in correspondence with each other, and can be quickly In addition, the buckle 22 on one side of the tibial articular liner 2 is buckled in the buckle groove 14 of the tibial base 1, so as to increase the stable combination of the tibial articular liner 2 and the tibial base 1, and Prevent loosening and improve the safety in use. Furthermore, a bone handle 4 is connected below the through hole 12 of the tibial base 1 (the bone handle 4 in this embodiment may also be a bone handle eccentric part during actual use), and the through hole 12 The angle design with one end of the bone handle 4 is a Morse Taper, so it has the characteristics of easy disassembly, and one end of the bone handle 4 is provided with a joint hole (not shown in the figure), and the joint hole has internal threads. For interlocking the combination hole and the screw 32 of the reinforcing member 3, use a tool (such as a screwdriver) to insert into the bushing 31 provided in the perforation 24 of the tibial articular surface pad 2, and rotate the locking screw 32 and the bone stem 4, At the same time, the bushing 31 is driven to expose one end of the tibial articular surface pad 2, and fitted into the groove 13 of the tibial base 1 to increase the ability of shear resistance after the combination of the two. A pillar 23 is arranged in the center to protrude in the femoral implant 5, so that the femoral implant 5 contacts and rolls with the curved surfaces 25, 26 of the tibial articular surface pad 2. The surface of 26 is a smooth arc surface, so the femoral implant 5 can provide smooth bending and straightening of the knee joint when rolling on the curved surfaces 25 and 26 of the tibial articular surface liner 2, and reduce stress concentration and tibial articular surface liner 2 The wear and tear of the tibial articular surface liner 2 of the present utility model (combined by a bushing 31 and a screw 32) is provided in the tibial articular surface liner 2, and its function is to strengthen the tibial articular surface liner 2 and resist femoral implants. The action of the insert 5 generates the stress on the tibial articular liner 2 without damage and deformation, effectively prolonging the service life, and the screw 32 of the reinforcement 3 is locked with the bone stem 4, driving the bushing 31 to fit into the groove 13, thereby increasing the ability to resist shear force. In addition, once the screw 32 of the reinforcing member 3 is loosened or broken, due to the special design of the perforation 24 (see Figure 3, the perforation 24 is narrow at the top and wide at the bottom), the screw 32 It will not fall out of the tibial articular liner 2 to cause danger or infection, and also take into account the safety in use, and the design that the reinforcement 3 is directly arranged on the tibial articular liner 2 can improve the operation efficiency.

The structure improvement of the orthopedic implant of the present utility model is characterized in that: a reinforcing member 3 is arranged in a liner 2, and the screw 32 of the reinforcing member 3 is locked downward to a bone handle 4 or the eccentric part of the bone handle 4, and simultaneously The bushing 31 of the dynamic reinforcement 3 is exposed below the tibial articular surface liner 2 and fits into the groove of the tibial base 1, so as to have the effects of firm combination, resistance to external force, prevention of deformation and prolonging the service life, thereby increasing the utility model's Practical and progressive; and the reinforcement 3 is directly arranged in the perforation 24 of the liner 2, and the perforation 24 is narrow at the top and wide at the bottom, and the outer edge of the bushing 31 of the reinforcement 3 is provided with threads or rough The special design of the surface has the effect of improving the operation efficiency, using safety and stabilizing the combination, thereby increasing the progress and safety of the utility model; and the modular design of each component is suitable for different individuals, and can be Partial replacement, to have the effect of convenient use and cost reduction, and then increase the practicability and convenience of the utility model. As mentioned above, the structural improvement of the orthopedic implant of the present invention has practicality, progress, safety and convenience.

The above descriptions are only preferred feasible embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. All equivalent structural changes made by using the description of the utility model and the contents of the accompanying drawings are all included in this utility model. within the scope of the utility model claims.

Claims (7)

1, a kind of orthopaedics implant structural improvement is characterized in that, comprising:

One tibial base, this tibial base has a recess, and these recess bottom surface central authorities are provided with a through hole that runs through tibial base, and this through hole upper limb stretches out and forms a groove, and a side of recess is provided with a catching groove;

One tibial prosthesis face liner, the recess of this corresponding tibial base in tibial prosthesis face liner bottom is formed with a protuberance, be fastened on the tibial base with compressing, and a side of this protuberance is provided with a fastener, this fastener is snapped in the catching groove of tibial base, and tibial prosthesis face liner top center is provided with a pillar, and this pillar is provided with a perforation that runs through tibial prosthesis face liner, and this tibial prosthesis face liner has two curved surfaces for touch scrollings in the pillar both sides again; And

One reinforcement, this reinforcement is arranged in the tibial prosthesis face liner, and this reinforcement is combined by a lining and a screw, wherein, this lining is embedded in the perforation of tibial prosthesis face liner, and has a trepanning in this lining, this trepanning bottom is provided with a stopper section, after causing this screw and inserting in the lining, the spiral shell body exposes trepanning, is butted on the stopper section and screw terminal is suitable.

2, orthopaedics implant structural improvement as claimed in claim 1 is characterized in that, wherein this tibial base connects a bone handle or bone handle eccentric part, and an end of this bone handle or bone handle eccentric part is socketed in the through hole of this tibial base.

3, orthopaedics implant structural improvement as claimed in claim 2 is characterized in that, wherein establishes a combined hole in the end of this bone handle or bone handle eccentric part, and this combined hole has the female thread that the screw for combined hole and reinforcement is mutually locked.

4, orthopaedics implant structural improvement as claimed in claim 3 is characterized in that, wherein the screw closure bone handle of this reinforcement or bone handle eccentric part, and the lining of this reinforcement of interlock exposes the groove of tibial prosthesis face liner one end and chimeric tibial base.

5, orthopaedics implant structural improvement as claimed in claim 1 is characterized in that, wherein the lining outer rim of this reinforcement is provided with increases fastening screw thread or matsurface between this lining and tibial prosthesis face liner.

6, orthopaedics implant structural improvement as claimed in claim 1 is characterized in that, wherein the perforation of this tibial prosthesis face liner is the up-narrow and down-wide shape of avoiding the reinforcement screw to fall.

7, orthopaedics implant structural improvement as claimed in claim 1 is characterized in that, wherein this reinforcement directly is equipped in the tibial prosthesis face liner.

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