Tibial prosthesis for knee arthroplasty

Abstract

The utility model relates to the technical field of knee joint prostheses for knee joint plasty, in particular to a tibia prosthesis for knee joint plasty, which comprises a tibia plate and a connecting part, a threading hole is arranged on the tibia plate, and the tibia prosthesis is firmly bound on a tibia by a suture through the threading hole, so that the initial fixation of the tibia prosthesis is realized; the porous coating is arranged on the connecting part, the porous structure is beneficial to ingrowth of bone tissue, the bone ingrows into the interconnecting pore channel and extends and is interwoven, so that interlocking combination is formed between the bone and the tibia prosthesis, and the long-term biological fixing effect is achieved; therefore, the whole process of implanting the tibial prosthesis into the human body is reliably fixed. In addition, the tibia prosthesis can be suitable for people with different sclerotin, and the requirement for the sclerotin of a patient is low.

Description

Technical Field

[0001] The utility model relates to the technical field of knee joint prostheses for knee arthroplasty, in particular to a tibial prosthesis for knee arthroplasty. Background Art

[0002] Knee arthroplasty is a surgical procedure used to reconstruct and resurface a knee that has been damaged, such as due to arthritis, and is commonly referred to as a knee replacement. Knee replacement generally consists of three components: a femoral condyle prosthesis, a tibial pad, and a tibial prosthesis. The tibial prosthesis is located at the proximal end of the tibia and is also a load-bearing component in the human body, so reliable fixation of the tibial prosthesis is particularly important. The prior art press-fits a tibial prosthesis coated with a porous coating onto a treated bone surface to stimulate bone tissue growth, promote bone tissue growth into the porous surface pores of the tibial prosthesis, and achieve biological interlocking. The tibial prosthesis coated with a porous coating has good long-term stability. However, due to the requirement of press-fitting when the tibial prosthesis is implanted, the patient needs to have good bone conditions, and the tibial prosthesis should be as large as possible, which easily causes thinning of the bone cortex and the risk of periprosthetic fractures leading to surgical failure, so that the initial stability of the prosthesis is difficult to ensure.

[0003] Therefore, it is necessary to develop a tibial prosthesis that can be fixed both initially and in the long term. Summary of the invention

[0004] The utility model aims to provide a tibial prosthesis which can be initially fixed and long-term fixed, so that the tibial prosthesis can be reliably fixed in the human body throughout the whole process.

[0005] The technical solution provided by the utility model is as follows: a tibial prosthesis for knee arthroplasty, the tibial prosthesis comprising: a tibial plate, the size and shape of the tibial plate being set to be placed on the proximal end of the patient's tibia, the tibial plate having an upper surface for placing a tibial pad and a lower surface engaged with the tibial surface, a boss being provided in the anterior-posterior direction of the upper surface to prevent the tibial pad from sliding on the tibial plate, the lower surface being provided with a connecting portion connected to the tibia, the outer surface of the connecting portion being coated with a porous coating, and characterized in that a plurality of mutually independent threading holes are respectively provided on the inner and outer side surfaces of the tibial plate, the threading holes extending from the side surfaces of the tibial plate to the lower surface.

[0006] In a preferred embodiment, the number of the threading holes is 3 on each of the inner and outer sides of the tibial plate.

[0007] In a preferred embodiment, the connecting portion includes a tibial stem and a keel wing, the tibial stem is vertically fixedly connected to the lower surface, the keel wing is located on both sides of the tibial stem, and the keel wing is detachably connected to the tibial plate or integrally connected.

[0008] In a preferred embodiment, the free end of the tibial stem is configured to be in the shape of a bullet head or a round head. The bullet head or round head design facilitates the insertion of the tibial stem into the tibia and plays a guiding role during the insertion process.

[0009] In a preferred embodiment, the porous coating is a plasma pure titanium coating.

[0010] The beneficial effects of the utility model are:

[0011] The tibial prosthesis is firmly bound to the tibia with sutures by threading through the threading holes of the tibial prosthesis to achieve the initial fixation of the tibial prosthesis; a porous coating is provided on the connection part, and the porous structure is conducive to the growth of bone tissue. The bone growth extends and interweaves in the internal connection channel, so that an interlocking combination is formed between the bone and the tibial prosthesis, thereby achieving a long-term biological fixation effect; thereby achieving reliable fixation of the tibial prosthesis in the human body throughout the entire process. In addition, the initial fixation of the tibial prosthesis is applicable to people with different bone qualities by setting threading holes and fixing with sutures, and has low requirements on the patient's bone quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of a tibial prosthesis of this embodiment;

[0013] Figure 2 for Figure 1 Bottom view of

[0014] Figure 3 for Figure 2 AA section view;

[0015] Figure 4 A diagram showing the tibial prosthesis in use according to this embodiment.

[0016] In the figure, a tibial prosthesis 1, a tibia 2, a tibial plate 10, an upper surface 11, a lower surface 12, a boss 13, a threading hole 14, a connecting portion 20, a tibial stem 21, a keel wing 22, and a suture 30 are shown. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] like Figure 1As shown, a tibial prosthesis 1 for knee arthroplasty includes: a tibial plate 10 and a connecting portion 20. The size and shape of the tibial plate 10 are set to be placed on the proximal end of the patient's tibia 2. The tibial plate 10 has an upper surface 11 for placing the tibial pad and a lower surface 12 engaged with the tibial surface. A boss 13 is provided in the anterior-posterior direction of the upper surface 11 to prevent the tibial pad from sliding on the tibial plate 10. The lower surface 12 is provided with a connecting portion 20 connected to the tibia 2. The outer surface of the connecting portion 20 is coated with a porous coating. The porous coating adopts a porous HA coating or a porous pure titanium coating. The coating in this embodiment is a plasma pure titanium coating. Three independent threading holes 14 are respectively arranged on the inner and outer sides of the tibial plate 10, and the threading holes 14 extend from the side of the tibial plate 10 to the lower surface 12.

[0019] The number of threading holes 14 is determined according to the size of the tibial plate 10 . When the tibial plate 10 is relatively large, four threading holes are provided on the inner and outer sides of the tibial plate 10 . Otherwise, one or two threading holes 14 are provided.

[0020] like Figure 2 and 3 As shown, the connecting portion 20 includes a tibial stem 21 and a keel wing 22. The tibial stem 21 is vertically fixedly connected to the lower surface 11 of the tibial plate 10. The keel wing 22 is located on both sides of the tibial stem 21. The keel wing 22 is detachably connected or integrally connected to the lower surface 12 of the tibial plate 10. The free end of the tibial stem 21 is set to a bullet head or round head shape.

[0021] like Figure 4 As shown, during the operation, one or more absorbable sutures 30 can be placed in the threading hole 14 to firmly bind the tibial prosthesis 1 to the processed bone surface to ensure reliable initial stability. After the operation, as the bone tissue grows into the porous coating of the tibial prosthesis connection part 20, the tibial prosthesis is tightly embedded with the bone surface to achieve long-term stability.

[0022] It should be noted that the anterior-posterior direction and the medial-lateral direction of the tibial prosthesis of the present invention are determined according to the direction in which the tibial prosthesis is implanted into the human body.

[0023] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tibial prosthesis for knee arthroplasty, the tibial prosthesis comprising: A tibial plate, the size and shape of which are set to be placed on the proximal end of a patient's tibia, the tibial plate having an upper surface for placing a tibial pad and a lower surface engaged with the tibial surface, a boss is provided in the anterior-posterior direction of the upper surface to prevent the tibial pad from sliding on the tibial plate, the lower surface is provided with a connecting portion connected to the tibia, the outer surface of the connecting portion is coated with a porous coating, and is characterized in that a plurality of mutually independent threading holes are respectively provided on the inner and outer side surfaces of the tibial plate, and the threading holes extend from the side surface of the tibial plate to the lower surface.

2. The tibial prosthesis for knee arthroplasty according to claim 1, characterized in that: The number of the threading holes is 3 on each of the inner and outer sides of the tibial plate.

3. The tibial prosthesis for knee arthroplasty according to claim 1, characterized in that: The connecting part includes a tibial stem and a keel wing, the tibial stem is vertically fixedly connected to the lower surface, the keel wing is located on both sides of the tibial stem, and the keel wing is detachably connected to the tibial plate or integrally connected.

4. The tibial prosthesis for knee arthroplasty according to claim 3, characterized in that: The free end of the tibial stem is configured to be in a bullet head or round head shape.

5. The tibial prosthesis for knee arthroplasty according to claim 1, characterized in that: The porous coating is a plasma pure titanium coating.

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