CN201734771U

CN201734771U - Intramedullary nail

Info

Publication number: CN201734771U
Application number: CN2010202683645U
Authority: CN
Inventors: 向铁成
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-23
Filing date: 2010-07-23
Publication date: 2011-02-09
Anticipated expiration: 2020-07-23

Abstract

The utility model discloses an intramedullary nail, which comprises a nail rod, lock pins, a threaded sleeve, a threaded sleeve bolt and a locking nut, wherein the front end of the nail rod is provided with a point part with forward threads, and at least one locking pin guide channel is arranged on the nail rod along a rod body from the tail end of the rod to the side surface of the front of the rod; a clamping groove is arranged at the back of the nail rod, and the surface of the clamping groove is provided with locking threads; the lock pins are arranged in the lock pin guide channels and extend out of the side surface of the front of the nail rod, and the outer surface of the threaded sleeve is provided with backward threads opposite to the forward threads of the point part; and the contact end parts of the threaded sleeve bolt and the threaded sleeve are matched by a concave and convex structure, and a convex block which is arranged on a hole wall of the threaded sleeve bolt is matched with the clamping groove at the back of the nail rod; and the locking nut is matched with the back of the nail rod through threaded connection. The utility model can make the operation simple, does not need X-ray equipment, shortens operation time, and solves that the lock pins are difficult to be nailed.

Description

A kind of intramedullary pin

Technical field

This utility model belongs to orthopedic instrument, is specifically related to a kind of intramedullary pin.

Background technology

Intramedullary pin fixedly is to treat one of maximum progress that fracture obtains this century; after using the fixing fracture of intramedullary pin; fracture can obtain preferably to the line para-position; can make operation away from fracture end, not cut skin, not peel off periosteum and surrounding soft tissue; do not require anatomical reduction; the blood circulation of protection fracture helps union of fracture, and can greatly reduce the generation of postoperative infection.Interlocking intramedullary nail is present widely used a kind of intramedullary pin, its structure as shown in Figure 1, it comprise nail bar 1 ' and pinning 2 '.During operation,, utilize pinning 2 ' laterally will follow closely bar 1 ' be fixed on the spongy bone of bone a, the two parts of fracturing are connected and fixed nail bar 1 ' squeeze into the spongy bone of bone a from the medullary cavity of bone a.The problem that interlocking intramedullary nail exists is the drift bolt difficulty, operation Shi doctor must by X-ray equipment guide pinning 2 ' accurately penetrate nail bar 1 ' on locating hole, make operating time longer, amount of bleeding is more, has increased the radiolesion to doctor and patient.Secondly, pinning 2 ' taking-up situation of difficult appears during second operation often.

The utility model content

It is simple that the purpose of this utility model provides a kind of operation, need not by X-ray equipment, shortens operating time, and last pinning is easy to intramedullary pin.

The technical scheme that realizes the employing of this utility model purpose is as follows: intramedullary pin comprises nail bar, pinning, thread bush, thread bush bolt and locking nut, the front end of described nail bar is provided with the pointed portion of band forward screw thread, and the nail bar upper edge body of rod is provided with a pinning guide channel from the bar tail end to bar toe lateral surface at least; The bar rear portion of nail bar is provided with draw-in groove, and appearance is provided with locking screw; Described pinning places in the pinning guide channel protruding from the bar toe lateral surface of nail bar; Described thread bush, thread bush bolt and locking nut are enclosed within the bar rear portion of nail bar successively, the outer surface of thread bush is provided with and the opposite reverse thread of described pointed portion forward screw thread, the thread bush bolt adopts concaveconvex structure to cooperate with the end that contacts of thread bush, the hole wall of thread bush bolt is provided with projection and cooperates with the draw-in groove at nail bar bar rear portion, and locking nut cooperates with nail bar bar rear portion by thread connecting mode.

Described pinning guide channel is two and is symmetricly set on the nail bar.

This utility model can utilize nail bar pointed portion and thread bush vertically to screw in the spongy bone at bone (as femur) two ends, laterally hammer into the spongy bone of bone front end from the front end of pinning guide channel with pinning, with the thread bush bolt utilize between itself and the thread bush and nail bar afterbody draw-in groove between concaveconvex structure with thread bush and nail bar relative localization, with locking nut that the thread bush bolt-lock is tight at last, make nail bar, thread bush and pinning become an integral body.Said structure of the present utility model can guarantee fixed effect from vertically with the rotation both direction fracture portions of bone being fixed.Because the screw thread of nail bar pointed nose and thread bush is opposite, can prevent limbs rotation and vertical shift after the bone fixation, have the anti-effect of revolving.Laterally hammer into the pinning of spongy bone, can play double fixed and further prevent the limbs rotation.Owing to changed the structure that existing interlocking intramedullary nail must guide the pinning perforation, need not make operation become simple and convenient during operation by X-ray equipment, can shorten operating time greatly, reduce amount of bleeding, avoid the infringement of radioactivity to doctor and patient.Because nail bar and thread bush are to adopt screw thread to be fixed on the spongy bone, pinning hammers into spongy bone from the side along the pinning guide channel on the nail bar, and it is convenient to get nail during second operation, has solved the problem of pinning difficulty on the existing interlocking intramedullary nail.

Further specify the technical solution of the utility model below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is the structural representation of existing interlocking intramedullary nail.

Fig. 2 is a structural representation of the present utility model.

Fig. 3 is a user mode sketch map of the present utility model.

The specific embodiment

See Fig. 2, intramedullary pin of the present utility model comprises nail bar 1, pinning 2, thread bush 5, thread bush bolt 6 and locking nut 8, the front end of nail bar 1 is provided with the pointed portion 4 of band forward screw thread, is arranged with two pinning guide channels 3 from the bar tail end to bar toe lateral surface in the nail bar 1 upper edge body of rod; The bar rear portion of nail bar 1 is provided with draw-in groove 10, and appearance is provided with locking screw 9; Pinning 2 places in the pinning guide channel 3 protruding from the bar toe lateral surface of nail bar 1; Thread bush 5, thread bush bolt 6 and locking nut 8 are enclosed within the bar rear portion of nail bar 1 successively, the outer surface of thread bush 5 is provided with and the opposite reverse thread 12 of described pointed portion 4 forward screw threads, the end of thread bush bolt 6 is provided with the groove fit of projection 11 and thread bush 7 ends, the hole wall of thread bush bolt 6 is provided with projection 7 and cooperates with the draw-in groove 10 at nail bar 1 bar rear portion, and locking nut 8 cooperates with the locking screw 9 at nail bar 1 bar rear portion.

See Fig. 3, during operation, to follow closely bar 1 earlier inserts from the medullary cavity of bone a, rotating nail bar 1 utilizes its pointed portion 4 will follow closely the spongy bone that bar 1 screws in bone a fracture front end, thread bush 5 oppositely screws in the spongy bone of fracture rear end on the rear sleeve of nail bar 1, pinning 2 is inserted pinning guide channel 3 laterally hammers into the fracture front end from the anterior side of nail bar 1 until the front end of pinning 2 spongy bone from nail bar 1 rear end, put thread bush bolt 6, utilize the projection 11 and the projection 7 on the hole wall of its end will follow closely bar 1 and thread bush 5 relative localizations, with locking nut 8 thread bush bolt 6 is locked at last, make nail bar 1, thread bush 5 and pinning 2 become an integral body fixes two parts of fracture.

Claims

1. intramedullary pin, comprise nail bar, pinning, it is characterized in that also comprising thread bush, thread bush bolt and locking nut, the front end of described nail bar is provided with the pointed portion of band forward screw thread, and the nail bar upper edge body of rod is provided with a pinning guide channel from the bar tail end to bar toe lateral surface at least; The bar rear portion of nail bar is provided with draw-in groove, and appearance is provided with locking screw; Described pinning places in the pinning guide channel protruding from the bar toe lateral surface of nail bar; Described thread bush, thread bush bolt and locking nut are enclosed within the bar rear portion of nail bar successively, the outer surface of thread bush is provided with and the opposite reverse thread of described pointed portion forward screw thread, the thread bush bolt adopts concaveconvex structure to cooperate with the end that contacts of thread bush, the hole wall of thread bush bolt is provided with projection and cooperates with the draw-in groove at nail bar bar rear portion, and locking nut cooperates with nail bar bar rear portion by thread connecting mode.

2. intramedullary pin according to claim 1 is characterized in that described pinning guide channel is two and is symmetricly set on the nail bar.