CN108392260A - Single condyle replacement tibia prosthesis anti-displacement fixator - Google Patents

Abstract

The invention provides a tibial prosthesis anti-displacement fixer for unicondylar replacement, which belongs to the technical field of surgical operation auxiliary equipment. The present invention includes a fixing part, a connecting part and a gripping part; the fixing part and the gripping part are connected through the connecting part; the fixing part includes an upper fixing part and a lower fixing part; the upper fixing part is a thin flat square metal rod, and the front part of the metal rod There is a cushion on the inner side of the surface; the lower fixing part is a round needle that can be inserted into the reserved bone medullary canal; the connecting part includes two connecting rods that cross and rotate; the rear end of one of the connecting rods is connected with a long handle The front end is fixedly connected, and its front end is fixedly connected to the rear end of the metal rod; the rear end of the other connecting rod is fixedly connected to the front end of the other long handle, and its front end is fixedly connected to the rear end of the round needle. The invention can securely fix the tibial prosthesis; and the operation is simple, and the original bone marrow canal is used without drilling holes in the bone; at the same time, the soft pad design of the contact surface of the prosthesis can protect the prosthesis and prevent iatrogenic wear.

Description

Anti-displacement fixator for tibial prosthesis in unicompartmental replacement

technical field

The invention belongs to the technical field of surgical operation auxiliary equipment, in particular to a tibial prosthesis anti-displacement fixer for unicondylar replacement.

Background technique

At present, unicondylar knee arthroplasty (UKA) has been widely used clinically and has achieved good surgical results. The advantages are small trauma, small incision, and light trauma. Excellent surgical results require accurate prosthesis placement. In clinical practice, when the femoral and tibial prostheses are installed on the bone through bone cement, the meniscus trial mold should be used before the bone cement has hardened. Extrude the excess bone cement to create a suitable space. When the meniscus is taken out for trial, the bone cement is not completely solidified at this time, and the fixation is unstable, which often causes the tibial prosthesis to shift or tilt, and needs to be relocated. The effect of surgery.

At present, there is no suitable clinical tool to solve the above problems. We can only wait for the bone cement to harden completely before taking it out. This wastes time and makes it difficult to remove the residual bone cement; or it is hoped that the surgeon will operate carefully. The present invention fills this gap.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a tibial prosthesis anti-displacement fixer for unicompartmental replacement, which provides prosthesis for the prosthesis before the bone cement is completely solidified and before the prosthesis and the bone surface form a firm bond. An exact and stable fixation ensures that the prosthesis does not shift or tilt.

In order to achieve the above object, the present invention provides the following technical solutions:

An anti-displacement fixer for tibial prosthesis for unicompartmental replacement, comprising a fixing part, a connecting part and a holding part; the fixing part and the holding part are connected through the connecting part.

Further, the holding part is two long handles, and the rear ends of the two long handles are connected by a resistance spring; as an example and not limitation, the length of the long handle may be 5 cm, and the length of the resistance spring in a non-use state is 2 cm.

Further, the fixing part includes an upper fixing part and a lower fixing part; the upper fixing part can be a thin flat square metal rod, in a preferred embodiment, the width of the metal rod is 5mm, the length of the metal rod is 3cm, and the front part of the metal rod The surface of the surface is provided with a cushion; the lower fixing part is a round needle that can be inserted into the reserved bone marrow canal. In a preferred embodiment, the diameter of the round needle is 1 mm, and the length of the round needle is 3 cm. In the state of use, the above-mentioned soft pad can be in contact with the upper surface of the tibial prosthesis, and the above-mentioned round needle is inserted into the reserved bone medullary canal to complete the fixation.

Further, the connecting part can include two connecting rods crossed and connected in rotation. In a preferred embodiment, the length of the connecting rods can be 3 cm; Fixedly connected, its front end is fixedly connected with the rear end of the metal rod; the rear end of the other connecting rod is fixedly connected with the front end of another long handle of the holding part, and its front end is fixedly connected with the rear end of the round needle.

The tibial prosthesis anti-displacement fixer for unicompartmental replacement provided by the present invention is used to fix the prosthesis after the meniscus is taken out for trial mold before the bone cement is completely solidified and before the prosthesis and the bone surface form a firm bond, so as to prevent It shifts or tilts.

The method of using the tibial prosthesis anti-displacement fixer for unicompartmental replacement provided by the present invention is: insert the round needle of the fixing part into the reserved bone medullary canal, and at the same time make the soft pad at the front of the metal rod and the upper surface of the tibial prosthesis Surface contact; hold the two long handles of the holding part tightly, and compress the resistance spring, so as to control the fixing part to clamp and fix the tibial prosthesis.

Compared with prior art, the beneficial effect of the present invention is:

(1) The tibial prosthesis can be firmly fixed.

(2) The operation is simple, and the original bone marrow canal is used without drilling holes in the bone.

(3) The padded contact surface of the prosthesis is designed to protect the prosthesis and prevent iatrogenic wear.

Description of drawings

Fig. 1 is the schematic structural view of the tibial prosthesis anti-displacement fixer for unicompartmental replacement provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the application scene of the tibial prosthesis anti-displacement fixer for unicompartmental replacement provided by an embodiment of the present invention.

Explanation of reference signs

10 Tibial prosthesis anti-displacement fixer for unicompartmental replacement;

1 fixed part, 11 metal rod, 111 cushion, 12 round needle;

2 connecting parts, 21 connecting rods;

3 grips, 31 long handles, 32 resistance springs;

tibial prosthesis 20;

Femoral prosthesis 30.

Detailed ways

The technical solution of the tibial prosthesis anti-displacement fixer for unicompartmental replacement provided by the present invention will be further described below in conjunction with specific embodiments and accompanying drawings. The advantages and features of the present invention will become clearer in conjunction with the following description.

It should be noted that the embodiments of the present invention have better implementability and are not intended to limit the present invention in any form. The technical features or combinations of technical features described in the embodiments of the present invention should not be regarded as isolated, and they can be combined with each other to achieve better technical effects. The scope of the preferred embodiment of the present invention may also include other implementations, and this should be understood by those skilled in the art to which the embodiments of the present invention pertain.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authorized Specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only, and not as limiting. Therefore, other examples of the exemplary embodiment may have different values.

The drawings of the present invention are all in a very simplified form and use inaccurate proportions, and are only used for the purpose of conveniently and clearly assisting in illustrating the embodiments of the present invention, and are not intended to limit the conditions for the implementation of the present invention. Any structural modification, change in proportion or size adjustment shall fall within the scope covered by the technical content disclosed in the present invention without affecting the effect and purpose of the present invention. And the same symbols appearing in the drawings of the present invention represent the same features or components, and can be applied in different embodiments.

Example

As shown in Figures 1 to 2, the present invention provides a tibial prosthesis anti-displacement fixer 10 for unicompartmental replacement, comprising a fixing part 1, a connecting part 2 and a gripping part 3; the fixing part 1 and the gripping part 3 They are connected by connecting part 2.

Further, the grip part 3 is two long handles 31, and the rear ends of the two long handles 31 are connected by a resistance spring 32; as an example and not limitation, the length of the long handle 31 can be 5 cm, and the resistance spring 32 is in a non-use state The lower length is 2cm.

Further, the fixing part 1 includes an upper fixing part and a lower fixing part; the upper fixing part can be a thin flat square metal rod 11, in a preferred embodiment, the width of the metal rod 11 is 5 mm, and the length of the metal rod 11 is 3 cm. The inner side of the surface of the metal rod 11 front part is provided with a cushion 111; the lower fixing part is a round needle 12 that can be inserted into the reserved bone marrow canal. In a preferred embodiment, the diameter of the round needle 12 is 1mm, and the length of the round needle 12 It is 3cm. In the state of use, the above-mentioned soft pad 111 can be in contact with the upper surface of the tibial prosthesis, and the above-mentioned round needle 12 is inserted into the reserved bone medullary canal to complete the fixation.

Further, the connecting part 2 may include two crossed and rotationally connected connecting rods 21. As an example without limitation, the two connecting rods 21 may be rotated and connected at respective middle positions. In a preferred embodiment, the length of the connecting rods 21 is It can be 3cm; the rear end of one of the connecting rods 21 is fixedly connected with the front end of a long handle 31 of the grip portion, and its front end is connected with the rear end of the metal rod 11; the rear end of the other connecting rod 21 is connected with the grip The front end of another long handle 31 of the holding portion is fixedly connected, and its front end is connected with the rear end of the round needle 12 .

The tibial prosthesis anti-displacement fixer 10 for unicompartmental replacement provided by the present invention is used to take out the meniscus trial mold before the bone cement is completely solidified and before the bone surfaces of the tibial prosthesis 20 and the femoral prosthesis 30 form a firm bond Finally, the tibial prosthesis 20 is fixed to prevent it from shifting or tilting.

The method of using the tibial prosthesis anti-displacement fixer 10 for unicompartmental replacement provided by the present invention is: insert the round needle 12 of the fixing part into the reserved bone medullary canal, and at the same time make the soft pad 111 at the front of the metal rod 11 and the tibia The upper surface of the prosthesis is in contact; the two long handles 31 of the holding part are held firmly, and the resistance spring 32 is compressed, thereby controlling the fixing part to clamp and fix the tibial prosthesis.

The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any change or modification made by any person familiar with the field based on the technical content disclosed above shall be regarded as an equivalent effective embodiment, and shall fall within the protection scope of the technical solution of the present invention.

Claims (1)

1. a kind of list condyle displacement technique tibial prosthesis anti-displacement fixator, it is characterised in that：Including fixed part (1), interconnecting piece (2) and Grip part (3)；

It is connect by the interconnecting piece (2) between the fixed part (1) and the grip part (3)；

The grip part (3) is two long handles (31), and passes through resistance spring (32) between the rear end of described two long handles (31) Connection；

The fixed part (1) includes upper fixed part and lower fixed part；Fixed portion is the metallic rod (11) of thin deltiod, institute The inner side surface for stating metallic rod (11) front is provided with cushion (111)；The lower fixed part is to be inserted into reserved marrow road In round needle (12)；

The interconnecting piece (2) includes two connecting rods (21) intersected and be rotatablely connected；The rear end of wherein one connecting rod (21) It is fixedly connected with the front end of a root long handle (31) of grip part (3), front end is fixedly connected with the rear end of metallic rod (11)；It is another The rear end of root connecting rod (21) is fixedly connected with the front end of another root long handle (31) of grip part (3), front end and round needle (12) Rear end be fixedly connected.