Extensible knee joint prosthesis structure

Abstract

The utility model discloses an extensible knee joint prosthesis structure which is characterized by comprising a knee joint thighbone side prosthesis, an extension part, a knob and a fixing device, an opening is formed in the top end of the knee joint thighbone side prosthesis, and the opening extends towards the interior of the knee joint thighbone side prosthesis to form an adjusting space; the extension part is arranged in the adjusting space in a sliding manner; the knob is mounted on the knee joint thighbone side prosthesis and extends into the adjusting space to drive the extending part to slide; the fixing device is installed on the knee joint thighbone side prosthesis and stretches into the adjusting space to fix the extending part to a working position. The utility model provides an extendable knee joint prosthesis structure, through the use of the device, the total length of the bone prosthesis can be adjusted, and when the lengths of the two lower limbs are slightly unequal, the affected limb can be extended in time, the length difference of the two lower limbs can be corrected, and the joint function and gait can be improved as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical fields of medical bone prostheses and the like, and in particular to an extendable knee joint prosthesis structure. Background Art

[0002] Primary malignant bone tumors are common in children and adolescents. Currently, the preferred limb-saving surgery is to use an artificial knee prosthesis to reconstruct the bone defect after bone tumor resection. Children are in the developmental stage, and after surgery, the bone formation potential of the contralateral lower limb will be greater than that of the affected side, resulting in a large difference in the length of the two lower limbs, followed by abnormal gait and scoliosis.

[0003] The patented prosthesis is specially designed to be adjustable in length. After surgery, the length of the prosthesis can be extended to correct the difference in length between the patient's lower limbs, thereby improving the patient's lower limb function and avoiding other complications. Utility Model Content

[0004] In view of this, in order to solve the above problems, the purpose of the present invention is to provide an extendable knee joint prosthesis structure, which includes:

[0005] Femoral prosthesis, extensions, knobs, and fixation devices for knee joints;

[0006] The top of the knee joint femoral prosthesis is provided with an opening, and the opening extends toward the inside of the knee joint femoral prosthesis to provide an adjustment space;

[0007] The extension portion is slidably disposed in the adjustment space;

[0008] The knob is installed on the femoral side of the knee joint prosthesis and extends into the adjustment space to drive the extension part to slide;

[0009] The fixing device is installed on the femoral side prosthesis of the knee joint and extends into the adjustment space to fix the extension part at a working position.

[0010] The above-mentioned extendable knee joint prosthesis structure, wherein the extension portion includes: a limiting column and an adjusting column; the limiting column is installed on the adjusting column, the diameter of the limiting column is larger than that of the adjusting column, and the adjusting column extends into the adjusting space.

[0011] In the above-mentioned extendable knee joint prosthesis structure, the adjustment column is provided with a rack along its length direction.

[0012] In the above-mentioned extendable knee joint prosthesis structure, the knob extends into the adjustment space and is installed on a gear, and the gear is meshed with the rack for transmission.

[0013] In the above-mentioned extendable knee joint prosthesis structure, the fixing device is two fixing screws.

[0014] In the above-mentioned extendable knee joint prosthesis structure, the adjustment column is provided with a plurality of limiting holes in an array along its length direction, and the fixing screw extends into the prosthesis on the femoral side of the knee joint and is fixed in the limiting hole.

[0015] The above-mentioned extendable knee joint prosthesis structure, wherein the lower part of the knee joint femoral side prosthesis is provided with a plurality of ligament fixing holes.

[0016] In the above-mentioned extendable knee joint prosthesis structure, a medullary pin is also installed on one end of the limiting column away from the adjusting column.

[0017] The above-mentioned extendable knee joint prosthesis structure, wherein the lower part of the knee joint femoral side prosthesis is subjected to high polishing treatment, the middle part of the knee joint femoral side prosthesis is provided with a grid structure, and the upper part of the knee joint femoral side prosthesis is subjected to sandblasting treatment.

[0018] Compared with the prior art, the above technical solution has the following positive effects:

[0019] Through the application of the utility model, an extendable knee joint prosthesis structure is provided. Through the use of the device, the overall length of the bone prosthesis can be adjusted. When there is a slight difference in the length of the two lower limbs, the affected limb can be extended in time to correct the length difference of the two lower limbs and improve the joint function and gait as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a first state of an extendable knee joint prosthesis structure of the utility model.

[0021] Figure 2 This is a schematic diagram of a second state of an extendable knee joint prosthesis structure of the present invention.

[0022] 1. Femoral prosthesis of the knee joint; 2. Extension; 3. Knob; 4. Fixing device; 5. Opening; 6. Limiting column; 7. Adjusting column; 8. Rack; 9. Limiting hole; 10. Medullary pin; 11. Ligament fixing hole. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations, but they are not intended to limit the present invention.

[0024] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0025] like Figure 1 As shown, an extendable knee joint prosthesis structure according to a preferred embodiment is shown, which includes: a femoral side prosthesis 1 of the knee joint, an extension part 2, a knob 3, and a fixing device 4.

[0026] An opening 5 is provided at the top of the femoral prosthesis 1 of the knee joint, and the opening 5 extends into the interior of the femoral prosthesis 1 of the knee joint to provide an adjustment space; the extension part 2 is slidably arranged in the adjustment space; the knob 3 is installed on the femoral prosthesis 1 of the knee joint, and extends into the adjustment space to drive the extension part 2 to slide; the fixing device 4 is installed on the femoral prosthesis 1 of the knee joint, and extends into the adjustment space to fix the extension part 2 in a working position.

[0027] During actual use, the total length of the femoral side prosthesis 1 of the knee joint can be adjusted according to the extension part 2, and the protruding length of the extension part 2 can be adjusted according to the knob 3. When the extension part 2 is adjusted to the required length by the knob 3, that is, the required working position, the extension part 2 is fixed in this working position by the fixing device 4, and the total length adjustment of the femoral side prosthesis 1 of the knee joint is completed.

[0028] The utility model also has the following implementation methods based on the above:

[0029] Further, an extendable knee joint prosthesis structure is provided, wherein the extension part 2 comprises: a limiting column 6 and an adjusting column 7; the limiting column 6 is installed on the adjusting column 7, the diameter of the limiting column 6 is larger than the adjusting column 7, and the adjusting column 7 extends into the adjustment space. Specifically, the edge of the limiting column 6 abuts against the edge of the knee joint femoral prosthesis 1, and the limiting column 6 can limit the extension part 2 as a whole outside the knee joint femoral prosthesis 1, ensuring that a part of the extension part 2 is located outside the knee joint femoral prosthesis 1.

[0030] Furthermore, an extendable knee joint prosthesis structure is provided, wherein the adjustment column 7 is provided with a rack 8 along its length direction.

[0031] Further, an extendable knee joint prosthesis structure is provided, wherein the knob 3 extends into the adjustment space and is installed on a gear, and the gear is meshed with the rack 8 for transmission. Specifically, the knob 3 rotates, and the rotation of the knob 3 drives the gear to rotate, and the rotation of the gear drives the rack 8 to move up and down, thereby adjusting the length of the extension part 2 extending into the knee joint femoral side prosthesis 1, and adjusting the overall use length of the bone prosthesis.

[0032] Furthermore, an extendable knee joint prosthesis structure is provided, wherein the fixing device 4 is two fixing screws.

[0033] Further, an extendable knee joint prosthesis structure is provided, wherein the adjustment column 7 is provided with a plurality of limiting holes 9 in an array along the length direction thereof, and the fixing screws extend into the knee joint femoral prosthesis 1 and are fixed in the limiting holes 9. Specifically, when adjusting the overall length of the bone prosthesis, the two fixing screws are removed from the knee joint femoral prosthesis 1, and when the overall length of the bone prosthesis is adjusted, the two fixing screws are passed through the knee joint femoral prosthesis 1 and tightened in the limiting holes 9.

[0034] Furthermore, in an extendable knee joint prosthesis structure, a plurality of ligament fixing holes 11 are provided at the lower part of the knee joint femoral side prosthesis 1. Specifically, the ligament fixing holes 11 are used to fix the ligaments.

[0035] Furthermore, in an extendable knee joint prosthesis structure, a medullary pin 10 is installed at one end of the limiting column 9 away from the adjusting column 7. Specifically, the medullary pin 10 is used to fix the femoral side prosthesis 1 of the knee joint.

[0036] Further, an extendable knee joint prosthesis structure is provided, wherein the lower part of the knee joint femoral prosthesis 1 is subjected to high polishing, the middle part of the knee joint femoral prosthesis 1 is provided with a grid structure, and the upper part of the knee joint femoral prosthesis 1 is subjected to sandblasting. Specifically, the grid structure in the middle part of the knee joint femoral prosthesis 1 is a coating of artificial trabeculae made when the knee joint femoral prosthesis 1 is manufactured, and is used for soft tissue healing.

[0037] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An extendable knee joint prosthesis structure, characterized in that: include: Femoral prosthesis, extensions, knobs, and fixation devices for knee joints; The top of the knee joint femoral prosthesis is provided with an opening, and the opening extends toward the inside of the knee joint femoral prosthesis to provide an adjustment space; The extension portion is slidably disposed in the adjustment space; The knob is installed on the femoral side of the knee joint prosthesis and extends into the adjustment space to drive the extension part to slide; The fixing device is installed on the femoral side prosthesis of the knee joint and extends into the adjustment space to fix the extension part at a working position.

2. The extendable knee joint prosthesis structure according to claim 1, characterized in that: The extension portion includes: a limiting column and an adjusting column; the limiting column is installed on the adjusting column, the diameter of the limiting column is larger than that of the adjusting column, and the adjusting column extends into the adjusting space.

3. The extendable knee joint prosthesis structure according to claim 2, characterized in that: The adjusting column is provided with a rack along its length direction.

4. The extendable knee joint prosthesis structure according to claim 3, characterized in that: The knob extends into the adjustment space and is installed on a gear, and the gear is meshed with the rack for transmission.

5. The extendable knee joint prosthesis structure according to claim 2, characterized in that: The fixing device is two fixing screws.

6. The extendable knee joint prosthesis structure according to claim 5, characterized in that: The adjusting column is provided with a plurality of limiting holes in an array along the length direction thereof, and the fixing screw extends into the prosthesis on the femoral side of the knee joint and is fixed in the limiting hole.

7. The extendable knee joint prosthesis structure according to claim 1, characterized in that: The lower part of the knee joint femoral side prosthesis is provided with a plurality of ligament fixing holes.

8. The extendable knee joint prosthesis structure according to claim 2, characterized in that: A medullary needle is also installed on one end of the limiting column away from the adjusting column.

9. The extendable knee joint prosthesis structure according to claim 1, characterized in that: The lower part of the femoral prosthesis of the knee joint is subjected to high polishing treatment, the middle part of the femoral prosthesis of the knee joint is provided with a grid structure, and the upper part of the femoral prosthesis of the knee joint is subjected to sandblasting treatment.

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