CN2738745Y - Locking screw structure of intramedullary nail - Google Patents

Abstract

A locking screw structure for an intramedullary nail, which includes two first and second locking pieces respectively composed of a joint part and an end part, and the outer edges of the two ends of the joint part are respectively provided with a threaded part, The end part has a recessed part, and the recessed part of the first locking part has a through hole adjacent to the assembly part, so that the second locking part is fixedly arranged in the through hole of the first locking part. It has the effect of increasing the strength of the locking screw, and it is not easy to loosen after the locking screw is locked.

Description

Locking screw structure of intramedullary nail

technical field

The utility model relates to a locking screw structure for intramedullary nails, in particular to a structure that can increase the strength of the locking screw and prevent the locking screw from loosening after locking.

Background technique

As shown in Figure 6, the traditional locking screw 5 used for intramedullary nails is composed of a locking part 52 provided with a thread 51 and an engaging part 53 arranged at one end of the locking part 52. The thread 51 is formed from scratch. Cover the outer edge of the locking portion 52 from end to end.

When in use, a tool (such as a screwdriver) is used to cooperate with the joint part 53, and the locking part 52 is screwed between the bone and the intramedullary nail by using its thread 51, so that the intramedullary nail is fixed at an appropriate place in the bone. , although the traditional locking screw 5 can fix the intramedullary nail in the proper place of the bone, its main defect is:

1. Since the locking part 52 of the locking screw 5 is covered with threads 51 from the beginning to the end, the outer diameter between the threads 51 and the threads 51 on the locking part 52 becomes smaller, and the locking part 52 is used as a support Intramedullary nailing is relatively fragile in its structure;

2. Moreover, the intramedullary nail is only locked by a locking screw 5, so it is very easy to cause loosening. Therefore, the locking screw 5 of the traditional intramedullary nail is not suitable for actual use. what the reader needs.

Contents of the invention

The main purpose of this utility model is to provide a locking screw structure for intramedullary nails, which overcomes the disadvantages of the prior art, increases the strength of the locking screw, and achieves Not easy to loose purpose.

The purpose of this utility model is achieved in this way: a locking screw structure for intramedullary nails, which is characterized in that: it includes two first and second locking pieces respectively composed of joint parts and ends; A locking member is composed of a joint part and an end part arranged at one end of the joint part. The outer edges of the two ends of the joint part are respectively provided with a threaded part, and the end part has a concave part. There is a through hole adjacent to the joint part on the recessed part; the second locking part is fixed in the through hole of the first locking part, and the second locking part is composed of the joint part and a It is formed by the end of one end of the joint part, and the outer edges of the two ends of the joint part are respectively provided with a threaded part, and the end part has a concave part.

The outer diameters of the ends of the first and second locking pieces are larger than the outer diameters of the connecting parts. The recesses at the ends of the first and second locking pieces have different shapes for matching with different screwing tools. The through hole is in an inclined shape. An internal thread portion is arranged in the through hole.

Further description will be given below in conjunction with preferred embodiments and accompanying drawings.

Description of drawings

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

Fig. 2 is a three-dimensional exploded schematic diagram of the utility model.

Fig. 3 is a schematic cross-sectional view of the utility model.

Fig. 4 is a side view of the utility model in use.

Fig. 5 is a second side view of the utility model in use.

Fig. 6 is a schematic perspective view of a conventional structure.

Detailed ways

Refer to Fig. 1-Fig. 3, which are respectively a three-dimensional schematic diagram, a three-dimensional exploded schematic diagram and a cross-sectional schematic diagram of the utility model.

The utility model is a locking screw structure for intramedullary nails, which is composed of a first locking piece 1 and a second locking piece 2 . The structure of the first and second locking elements 1 and 2 increases the strength of the locking screw, and through the cooperation of the first and second locking elements 1 and 2, the locking screw is not easy to loosen after being locked.

The first locking member 1 is composed of a joint part 11 and an end part 12 arranged at one end of the joint part 11, and the outer diameter of the end part 12 is larger than the outer diameter of the joint part 11, and the joint part The outer edges of the two ends of 11 are respectively provided with a threaded part 13, 14, and there is no thread provided between the threaded parts 13, 14 at the two ends, and the end 12 has a recessed part 15, which can be matched with different The screwing tool has different shapes, such as straight, cross or inner hexagon, etc., and the recessed part 15 at the end has a through hole 16 adjacent to the joint part 11, and an internal thread is provided in the through hole 16 part 17, and the through hole 16 is in an inclined shape;

The second locking member 2 is fixedly arranged in the through hole 16 of the first locking member 1, and the second locking member 2 is composed of a joint part 21 and an end part 22 arranged at one end of the joint part 21, and The outer diameter of the end portion 22 is larger than the outer diameter of the joint portion 21, and the outer edges of the two ends of the joint portion 21 are respectively provided with a threaded portion 23, 24, and there is no thread provided between the threaded portions 23, 24 at the two ends. And there is a concave part 25 at the end part 22, and the concave part 25 of the end part 22 is to match different screwing tools and be different shapes, such as inline shape, cross shape or inner hexagonal shape etc. A brand-new locking screw structure for intramedullary nails is formed by the above structure.

Referring to Fig. 4-shown in Fig. 5, it is the use state side view of the present utility model, when the present utility model is in use, be to match the recessed part 15 of the first locking member 1 with a tool (not shown in the figure) earlier, will The assembly part 11 of the first locking member 1 is locked on the intramedullary nail 3, so that the threaded parts 13, 14 at the two ends of the assembly part 11 can be combined with the intramedullary nail 3 and the bone 4, and the threaded parts 13, 14 at the two ends The 14 parts without threads are fixed inside the intramedullary nail 3, and because there are no threads between the two threaded parts, but a solid cylinder, and the outer diameter is larger than that of the second threaded parts 13, 14, therefore, the The intramedullary nail 3 passes through the assembly part 11 where no thread is provided as a relatively strong support;

After the first locking element 1 is fixed, a tool is used to cooperate with the recessed part 25 of the second locking element 2, and the assembly part 21 of the second locking element 2 is fixed to the through hole 16 of the first locking element 1 In this way, the assembling part 21 of the second locking member 2 passes through the threaded parts 23, 24 at both ends, and fits the internal threaded part 17 in the through hole 16 in an oblique manner, and is locked on the intramedullary nail 3, except It can also achieve the same effect as the first locking member 1, and can be used as an auxiliary function of the first locking member 1, so that the first locking member 1 can be locked on the first locking member 1 through the cooperation of the second locking member 2. After intramedullary nail 3, reach the purpose that is not easy to get loose.

The above are only preferred embodiments of the present utility model, and all simple equivalent changes and modifications made according to the contents of the present utility model shall fall within the protection scope of the present utility model.

Claims (5)

1, a kind of Locking screw of intramedullary pin structure is characterized in that: it includes two respectively by group connecting part and first and second locking part that the end constituted; This first locking part is made of the end that a group connecting part and is arranged at group connecting part one end, and two end outer rims of this group connecting part are to be equipped with a threaded portion respectively, and this end is to have a depressed part, is the through hole with contiguous this group connecting part on this depressed part; This second locking part is to be fixedly arranged in the through hole of described first locking part, this second locking part is made of the end that a group connecting part and is arranged at group connecting part one end, two end outer rims of this group connecting part are to be equipped with a threaded portion respectively, and this end is to have a depressed part.

2, the Locking screw of intramedullary pin according to claim 1 structure, it is characterized in that: the external diameter of the end of this first and second locking part is the external diameter greater than this group connecting part.

3, the Locking screw of intramedullary pin according to claim 1 structure is characterized in that: the depressed part of the end of this first and second locking part is to have to cooperate the different difformities that screw togather instrument.

4, the Locking screw of intramedullary pin according to claim 1 structure is characterized in that: this through hole is to be one skewed.

5, the Locking screw of intramedullary pin according to claim 1 structure is characterized in that: be to be provided with an internal thread part in this through hole.

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