CN2471292Y

CN2471292Y - Automatic pressurized anti-rotation intramedullary nail

Info

Publication number: CN2471292Y
Application number: CN 01205475
Authority: CN
Inventors: 万黎
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-01-11
Filing date: 2001-01-11
Publication date: 2002-01-16
Anticipated expiration: 2011-01-11

Abstract

The utility model discloses medical use automatic compression anti-circumrotate intramedullary nail, and the cross section of the utility model is of clover leaf pattern. The lumen of the utility model has four quincunx elastic clasp (2) and a stiffening ring (3). The two horizontal petals of the elastic clasp (2) have convex parts which extend out of the elongated slot (5) on the wall of the anti-circumrotate intramedullary nail (1), thus solving the problem that the present intramedullary nail can not solve the stress conduction at the fracture end and other problems such as complex operation, a plurality of surgical incisions and easily-broken screws after the surgery. The utility model has the advantages of being simply structured, having good usage effect and short fracture healing time, fracture nonunion rate being low and having a convenient usage. The utility model is widely used in curing diseases like stable fracture, unstable fracture and fracture nonunion.

Description

The anti-intramedullary pin that revolves of medical automatic pressurization

This utility model relates to that a kind of medical automatic pressurization is anti-revolves intramedullary pin, more particularly, relates to that a kind of orthopaedics therapy long bone shaft fracture connects and fixed automatic pressurization and the intramedullary pin that prevents to rotate.

In the prior art, except traditional intramedullary pin, most typical is exactly intramedullary nail with lock, be characterized in respectively being drilled with through nail body tube wall screw near, the far-end of intramedullary pin nail body, after installing at the nail body, near at it again, far-end penetrates by the transverse presentation of sclerotin and screw or loxosis screw, rotation and shearing with the control fracture end, the application adaptation disease of intramedullary pin is also expanded to thereupon and is pulverized and oblique fracture, has increased the stability of fracture fixation, has improved the union of fracture rate.Clinical operation facts have proved that intramedullary nail with lock can not solve the stress conducting problem of fracture end, and art time operation needs carry out under x-ray fluoroscopy, complicated operation and operative incision are many, problems such as screw extraction easily take place again in postoperative, are restricted so use, and are difficult to replace traditional intramedullary pin.

The purpose of this utility model is to provide a kind of fracture end of realizing to pressurize automatically, prevents the self-locking intramedullary pin of fracture end and the rotation of nail body.

In order to achieve the above object, this utility model provides following technical scheme: design the anti-intramedullary pin that revolves of a kind of medical automatic pressurization, cross section is the cavity of opening cloverleaf pattern, the long trough opening is vertically arranged, in the anti-cavity that revolves intramedullary pin (1), two or more quincunx snap rings of spaced each other pintongs (2) are housed longitudinally, anti-relative anti-the revolving on intramedullary pin (1) wall in long trough opening (4) both sides of revolving intramedullary pin (1) longitudinally has elongated slot (5), horizontal two lobes of snap ring (2) have ledge to stretch out elongated slot (5) and are stuck, the size of snap ring (2) adapts with anti-cavity size of revolving intramedullary pin (1), and the size of elongated slot (5) and quantity and snap ring (2) adapt.

This utility model technical scheme preferably is: there is reinforcing ring (3) at the vertical relative two lobe tips of the quincunx snap ring of pintongs (2) on the lobe inner face, and reinforcing ring (3) links to each other with the lobe point of snap ring (2).The tinsel of snap ring (2) and reinforcing ring (3) the most handy stainless steel silk or other hardness height, good springiness is made, to guarantee its axial compressive force and axial thrust load.

Compared with prior art, the utlity model has following tangible advantage:

At first, a place of traditional Flos Mume being followed closely based on this utility model fixedly becomes three-dimensional fixation, increased the stable of internal fixation, the fracture end due to the fixed limb activity and the rotation of intramedullary pin have effectively been prevented, can control effectively that fracture end is bent, turns round, revolved, shear stress, can make fracture end have the generation and the conduction of physiological stress all the time; Secondly, can continue to give fracture end, guarantee that fracture end has better stability and avoided stress concentration and stress shielding with axial compressive force.Owing to be the pressurization of the axial thrust load of elastic force, elastic force has finiteness, and fracture end had fine motion when limb activity was early stage, thereby meet more and promote union of fracture " fine motion theory ", promote the healing of fracture, shortened healing time, significantly reduced the disunion rate of fracture; In addition, this utility model is simple in structure, easy to use, cost of manufacture is low and applied widely.

Below be drawing explanation of the present utility model:

Fig. 1 is a longitudinal sectional view of the present utility model;

Fig. 2 is a side view;

Fig. 3 is the A-A cross section view.

Among the figure, the 1st, prevent revolving intramedullary pin, the 2nd, snap ring, the 3rd, reinforcing ring, the 4th, long trough opening, the 5th, elongated slot.As seen from the figure, in the anti-cavity that revolves intramedullary pin (1), the quincunx snap ring of spaced each other pintongs (2) is housed longitudinally, anti-relative anti-the revolving on intramedullary pin (1) wall in long trough opening (4) both sides of revolving intramedullary pin (1) longitudinally has elongated slot (5), and horizontal two lobes of snap ring (2) have ledge to stretch out elongated slot (5) and are stuck.

Claims

1, the anti-intramedullary pin that revolves of a kind of medical automatic pressurization, cross section is the cavity of opening cloverleaf pattern, the long trough opening is vertically arranged, it is characterized in that: in the anti-cavity that revolves intramedullary pin (1), two or more quincunx snap rings of spaced each other pintongs (2) are housed longitudinally, anti-relative anti-the revolving on intramedullary pin (1) wall in long trough opening (4) both sides of revolving intramedullary pin (1) longitudinally has elongated slot (5), horizontal two lobes of snap ring (2) have ledge to stretch out elongated slot (5) and are stuck, the size of snap ring (2) adapts with anti-cavity size of revolving intramedullary pin (1), and the size of elongated slot (5) and quantity and snap ring (2) adapt.

2, according to claim 1ly anti-revolve intramedullary pin, it is characterized in that: there is reinforcing ring (3) at the vertical relative two lobe tips of the quincunx snap ring of pintongs (2) on the lobe inner face, and reinforcing ring (3) links to each other with the lobe of snap ring (2) is sharp.