CN87211219U

CN87211219U - Expansion type bone nail

Info

Publication number: CN87211219U
Application number: CN 87211219
Authority: CN
Inventors: 王慈庆
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-09-24
Filing date: 1987-09-24
Publication date: 1988-05-25

Abstract

The utility model provides a new bone nail product suitable for the internal fixation of cuboid bone neck fracture, which is composed of a screw bolt, a nut and a jacket tube. Because both ends of the expansion type bone nail can moderately splay when the screw bolt and the nut are fixed tightly, and fracture cross-section can be pressed, which is favorable to the cicatrization of the fracture cross-section. A splaying nail croccus can be inserted into a porotic matter in bones, being hard to generate replacement, so the internal fixation of fracture is firm and stable, and the utility model is a medical instrument which has better effect of the internal fixation in bone fracture operation.

Description

Expansion type bone nail

This utility model relates to a kind of improved nail, belongs to medical instruments field.

At present, in the fracture internal fixation operation, nail commonly used is a hip nail.It is made by rustless steel, and appearance is prismatic.This nail relies on three ribs to embed in the interior loose matter of bone, to reach the internal fixation purpose.But, because the quality of intramedullary bone matter is loose, be difficult for fixation, when especially hip nail was used for the cuboid fracture of cervical vertebra of old people Yi Fa, effect was relatively poor, often because of the hip nail displacement, fracture face is thrown off or dislocation, cause the synthetism failure, operative reduction and the artificial intraarticular of use are fixed again, and this brings greatest misery and loss to patient.

This utility model on the basis of existing rhizoma sparganic nail, has changed structure at above-mentioned shortcoming, make nail in inserting bone after the loose matter, two ends can stressed appropriateness be opened when fastening, like this, both made that the knochenbruch face is stressed to be compressed mutually, the nail two ends are embedded in the interior loose matter of bone, make its be difficult for displacement, thereby, make the nail fixation, help the better and faster healing of fracture face, after the fracture face healing, it also can take out easily if necessary.

The expansion type nail of this utility model design is made up of bolt 1, nut 2 and sleeve pipe 3.

Fig. 1 is the front view of this utility model expansion type nail.

Fig. 2 is the front view of the bolt of the bloated swollen formula nail of this utility model.

Fig. 3 is the sleeve pipe profile of expansion type nail.

Fig. 4 is the nut profile of expansion type nail.

Below in conjunction with embodiment and accompanying drawing this utility model is described in further detail:

With reference to Fig. 1-4, the front end of hollow bushing 3 has expandable nail slit bamboo or chopped wood 4, and the rear end has 5, three nails of straight trough slit bamboo or chopped wood 4 can be along radially 120 ° of arrangements of sleeve pipe.The front end of nail slit bamboo or chopped wood 4 is the inclined-plane, has circular groove 6 in it and telescopic junction, and the head of bolt 1 is tapered, and drift angle is 90 °, and And has surface groove 7 and planar slot 8.The afterbody of bolt 1 moves back a nail groove 9 and a word groove 10.The front end of nut 2 is round table surface 11, and the rear end is homalocephalus shape, and it is fastening to be convenient to spanner.When bolt 1 and nut 2 are fastening, open under the effect that nail slit bamboo or chopped wood 4 advances ， And to split on the inclined-plane along the inclined-plane of the surface groove 7 of bolt head.If surface groove 7 is 22.5 ° of angles with central axis, when nut 2 during 10 millimeters of axial precessions, the top of then following closely slit bamboo or chopped wood 4 is split on 22.5 ° of inclined-planes and is advanced 3 millimeters.For diameter is 10 millimeters nail, and after three nail slit bamboo or chopped woods were opened, the formed circular diameter in its top can reach 16 millimeters.The existence of circular groove 6 makes nail slit bamboo or chopped wood 4 open ， And easily and embeds in the matter of loosening in the bone, is difficult for displacement.

The expansion type nail that this utility model provides, easy and simple to handle reliable, fixation is stable, because the nail two ends can appropriateness be opened, form axially and tangential component, both made that the knochenbruch face is stressed to be compressed, make nail be difficult for displacement again, helping fracture face and heal early, is the better bone fracture internal fixing device of a kind of synthetism effect.During operation behind conventional surgical anesthesia and knochenbruch reduction by traction, with the appropriate location of guiding bone drill on the cortical bone of the knochenbruch outside, pierce the guiding round needle earlier, determine to pierce the degree of depth according to skeleton size and knochenbruch position, selected nail size, (this utility model according to skeleton size and knochenbruch Position Design the expansion type nail of corresponding specification), the guide pin that intercepted length is suitable, reuse hollow bone drill bushing get out big or small on guide pin and the degree of depth is suitable enters to follow closely the hole.Then, the expansion type nail that has assembled of the corresponding specification of this utility model with the hammer into nail hole of beating in, is selected for use the length of nail slightly to reveal with tail end and is advisable, open and get final product to following closely slit bamboo or chopped wood 4 appropriateness, can shield precession with X-ray during operation while observing with spanner clamp nut 2.When needing to take out nail, as long as unscrew nut 2, bolt is beated in a bit slightly, nail slit bamboo or chopped wood 4 and surface groove 7 are thrown off, make 60 ° of bolt 1 rotations with straight screwdriver then, when bolt tail moves back the nail groove when by chance being emerging in the breach of groove 5 of sleeve pipe 3, nail slit bamboo or chopped wood 4 has been aimed at and has moved back nail planar slot 8, and can outwards take out nail this moment.

Each parts of nail of the present utility model select for use medical titanium steel or stainless steel material to make.

Claims

1, a kind of metal nail that is made of bolt 1, nut 2 and sleeve pipe 3 is characterized in that the front end of sleeve pipe 3 has expandable nail

4, the rear end has straight trough 5, can open when bolt 1 and nut 2 are fastening thereupon.

2, nail as claimed in claim 1 is characterized in that the forward nail of sleeve pipe slit bamboo or chopped wood 4 is having a circular groove 6 with telescopic junction.

3, nail as claimed in claim 1 is characterized in that the head of bolt 1 is tapered, and drift angle is 90 °, and has surface groove 7 and planar slot 8.

4,, it is characterized in that three nail slit bamboo or chopped woods 4 are along radially 120 ° of arrangements of hollow bushing as claim 1 and 2 described nails.

5, nail as claimed in claim 1 is characterized in that each parts makes by rustless steel.