CN204133595U

CN204133595U - Novel orthopaedics Medical screw

Info

Publication number: CN204133595U
Application number: CN201420439931.7U
Authority: CN
Inventors: 吴兴; 宋梅; 魏新; 黄炳全
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-08-06
Filing date: 2014-08-06
Publication date: 2015-02-04
Anticipated expiration: 2024-08-06

Abstract

A kind of novel orthopaedics Medical screw, adopts during steel plate screw internal fixtion at fracture operation and uses.Comprise threaded rod, countersunk head, countersunk head end face is designed with equilateral triangle groove or ellipse (wicker leaf shape) groove; The inclined-plane of countersunk head and threaded rod junction is provided with locked screw thread.The periphery of countersunk head is with countersunk head limit groove, and the shape of countersunk head limit groove is rectangular channel.The periphery of countersunk head is with the countersunk head limit wing.This utility model is on the basis not changing original soket head cap screw overall dimensions and screw countersunk head size, and in adopting, the structure of positive triangle replaces interior hexagonal.Because the structure of Triangle ID is more stable, the intensity of the screw of Triangle ID structure is obviously large than the intensity of interior hexagonal.In the calculating of local deformation modulus, Triangle ID screw is also better than the screw of interior hexagonal structure.Decrease more greatly the probability that Medical orthopedic screw easily grinds off interior side, structure is more stable, reduces the stripped thread occurred because of turning.

Description

Novel orthopaedics Medical screw

Technical field

This utility model relates to a kind of medical apparatus for orthopaedics, particularly relates to a kind of novel orthopaedics Medical screw.

Background technology

Along with the quickening of work, rhythm of life, the generation of extremity fracture inevitably gets more and more, in order to pursue high-quality life, it is more and more extensive that surgical operation gets involved internal fixation treatment, simple just my institute's extremity fracture operation in nearly 20 years adopts steel plate screw internal fixation, postoperatively occur that (precontract of 2000 has 5% when getting internal fixation steel plate screw, the patient of 2% is about had to go out after 2000) screw situation about can not take out smoothly proposes to inquire into, and situation about can not take out smoothly is common as follows: 1, broken nail; 2, screw tail end stripped thread; 3, set time overlength, screw-tipped callus holds seriously, cannot back-out.Wherein common with screw tail end stripped thread situation: before 2000, screw mostly is cruciate flower or in-line, after there is biochemical reaction in inside-fixture in body, screw tail end moulding place intensity changes, the wearing and tearing of removal equipment in addition, cause both screw and removal equipment can not good contact, occur when turning that modification produces stripped thread, better improved along with interior six hole screws and Self-locking screw enter clinical setting after 2000, but still have the situation of 2% to occur, this and high rigidity, the Reusability of high-quality screw and removal equipment weares and teares, hardness is different, and the set time is of a specified duration, inside-fixture generation biochemistry cell reaction weight, hinder limb internal fixtion and take out front high strength activity, when causing taking out in screw six hole modification to lose seamed edge etc. relevant, more once there is routine patient's screw tail end complete, but the situation that interior six holes in tail end twist off occurs.Once this thing happens, the taking-up of inside-fixture is extremely bothered, device for taking out broken nail tool can not be used, the steel plate that industrial drill bit need be used to grind off screw tail end and contact with it, re-uses device for taking out broken nail tool and takes out screw, extend the operating time of operation, increase the weight of the probability polluted of performing the operation, postoperatively to infect, the probability of refracture strengthens, increase economy and the psychological burden of patient, the utility model proposes a kind of Medical screw of improvement for this reason.

Summary of the invention

The purpose of this utility model be to provide a kind of structure simple, easy to operate, get nail be easy to novel orthopaedics Medical screw.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of novel orthopaedics Medical screw, comprises threaded rod, countersunk head, it is characterized in that: described countersunk head end face is designed with equilateral triangle groove or oval-shaped groove; The inclined-plane of countersunk head and threaded rod junction is provided with locked screw thread.

According to described novel orthopaedics Medical screw, it is characterized in that: the periphery of described countersunk head is with countersunk head limit groove, and the shape of countersunk head limit groove is rectangular channel.

According to described novel orthopaedics Medical screw, it is characterized in that: the periphery of described countersunk head is with the countersunk head limit wing.

This utility model is on the basis not changing original soket head cap screw overall dimensions and screw countersunk head size, and in adopting, the structure of positive triangle replaces interior hexagonal.Because the structure of Triangle ID is more stable, the intensity of the screw of Triangle ID structure is obviously large than the intensity of interior hexagonal.In the calculating of local deformation modulus, Triangle ID screw is also better than the screw of interior hexagonal structure.We adopt the positive triangle instrument corresponding with interior positive triangular screw, can to screw carry out fastening with unload.Decrease the probability that Medical orthopedic screw easily grinds off interior side, known M1=M2=M, D1=D2=D, regular hexagon limit and equilateral triangle summit are L to the distance of outside cylinder, and orthohexagonal circumradius is r1, and diameter is d1, equilateral triangle radius is r2, and diameter is d2, then:

Namely : that is:

Internal force moment of torsion torsion Section modulus

As can be seen here, the antitorque distortion of triangular sunk screw is greater than hexagonal sunk screw, and this case is feasible.

Accompanying drawing explanation

Fig. 1 is that in this utility model, countersunk recesses is the structural representation of equilateral triangle.

Fig. 2 is the front view of countersunk head in Fig. 1.

Fig. 3 is appearance schematic diagram of the present utility model.

Fig. 4 is that in this utility model, countersunk recesses is the another kind of example structure schematic diagram of oval (wicker leaf shape).

Fig. 5 is the front view of countersunk head in Fig. 4.

In accompanying drawing: 1, threaded rod; 2, countersunk head; 3, inclined-plane; 4, equilateral triangle groove; 5, oval-shaped groove; 6, countersunk head limit groove; 7, the countersunk head limit wing.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:

This utility model as shown in Figure 1, Figure 2, Figure 3 shows, comprises threaded rod 1, countersunk head 2, and countersunk head 2 end face is designed with equilateral triangle groove 4; Countersunk head 2 and the inclined-plane 3 of threaded rod 1 junction are provided with locked screw thread.

Another kind of embodiment of the present utility model is as shown in Fig. 3, Fig. 4, Fig. 5, and its countersunk head 2 end face is oval-shaped groove 5(wicker leaf shape groove).

The periphery of the countersunk head 2 in this utility model is with countersunk head limit groove 6, and the shape of countersunk head limit groove 6 is rectangular channel.

The periphery of the countersunk head 2 in this utility model is with the countersunk head limit wing 7.

this utility modelcarry out fastening with can with a kind of sleeve shaped tool operation matched with this utility model when unloading, sleeve type instrument is with corresponding to protruding and groove and groove of the present utility model and the wing.

Equilateral triangle groove 4 of the present utility model or the antitorque distortion of ellipse (wicker leaf shape) groove are comparatively large, and decrease the probability that Medical orthopedic screw easily grinds off interior side, structure is more stable, reduce the stripped thread occurred because of turning.

Claims

1. a novel orthopaedics Medical screw, comprises threaded rod (1), countersunk head (2), it is characterized in that: described countersunk head (2) end face is designed with equilateral triangle groove (4) or oval-shaped groove (5); Countersunk head (2) and the inclined-plane (3) of threaded rod (1) junction are provided with locked screw thread; The periphery of countersunk head (2) is with countersunk head limit groove (6) and the countersunk head limit wing (7), and the shape on countersunk head limit groove (6) is rectangular channel.