CN2516107Y

CN2516107Y - Yellow ligament incision knife

Info

Publication number: CN2516107Y
Application number: CN 02212248
Authority: CN
Inventors: 刘培亭; 郭舒亚; 曹慧仁; 隋红; 李悦芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-01-18
Filing date: 2002-01-18
Publication date: 2002-10-16
Anticipated expiration: 2012-01-18

Abstract

Disclosed is a ligamentum flavum knife which is shaped like an L and is composed of four parts, a handle, a connecting rod, a depth limiting safety shield and a knife head. The edged face of the knife head is arranged toward the handle for reverse cut, the knife back is a blunt narrow side, and the knifepoint is round and blunt for preventing the knife head from punching the ligamentum flavum and cutting the dura mater; the depth limiting safety shield prevents the knife head from entering into the vertebral canal too deep; the long shaft of the knife head is drilled through the ligamentum flavum to the gap outside the dura mater along the fibre direction of the ligamentum flavum, deviating from the longitudinal axis and rotating n 45-60 degrees , and then the knife is lifted for carving the ligamentum flavum from the deep part to the shallow part without hurting the dura mater and the nerve root. The method in the utility model is safe and convenient, particularly applicable to operations under a microendoscopic discectomy.

Description

The ligamenta flava incision knife

Technical field

This utility model relates to a kind of spinal surgery apparatus, relates to a kind of ligamenta flava incision knife specifically.

Background technology

Prolapse of lumbar intervertebral disc, spinal canal stenosis are common clinicals, and safety is cut, the excision ligamenta flava, and the iatrogenic injury of avoiding dura mater and nerve root is the successful important step of operation.The method of cutting ligamenta flava at present generally is directly to cut to the deep from the surface with stylet, damages dura mater and nerve root easily, and is very dangerous.

Summary of the invention

The purpose of this utility model is to avoid this danger, designs a kind of apparatus of safe, easy incision ligamenta flava.

Design concept of the present utility model is achieved in that ligamenta flava is made up of elastic fiber, rises and terminates in the next vertebral plate upper limb from upper vertebral plate front, about 4 millimeters of thickness.Design L type can be from the reverse cut cutter that cuts towards superficial surface deeply, the sword face of cutter head is towards handle, the knife back is the narrow limit of passivity, the point of a knife circle is blunt, the cutter head major axis is passed ligamenta flava along the ligamenta flava machine direction reach epidural space, depart from 45 °～60 ° of longitudinal axis rotations, mention incision knife, can not injure dura mater and nerve root from dark and shallow incision ligamenta flava.In addition, dark excessively for preventing that incision knife from entering canalis spinalis, cutting the dark safety screen of increase limit on the cutter head near-end handle.Accurately judge the direction of blade in order to enter the back at cutter head besides, on safety screen, be provided with blade and point to scale with the handle of a knife tail end.

This utility model is exclusively used in the incision of ligamenta flava, and is rational in infrastructure, compared with prior art, and method safety, easy.Cutter head also can play the effect of nerve dissector, and loosen adhesion is finished with cutting one step of ligamenta flava, saves operating time, is particularly suitable for the operation technique under the MED.

Description of drawings

Fig. 1 looks sketch map for master of the present utility model;

Fig. 2, this utility model A-A (amplification) cutaway view;

Fig. 3, this utility model B-B (amplification) cutaway view;

Fig. 4, this utility model C-C (amplification) cutaway view;

Sketch map is looked on Fig. 5, this utility model right side.

Wherein: dark safety screen 4 cutter heads 5 cutter heads 6,7 blades of 1 handle 2 connecting rods, 3 limits point to scale

The specific embodiment

This utility model is described in detail as follows in conjunction with the accompanying drawings: the ligamenta flava incision knife is by L type cutter head (4) handle (1), connecting rod (2), limit dark safety screen (3) to form, the inboard of cutter head (5) is for to go the curved blade (4) of reverse cut, its back is the narrow limit of passivity, nose-circle is blunt, cut dura mater after avoiding cutter head to pass ligamenta flava, be provided with outstanding annular between blade (4) and the connecting rod (2) and limit dark safety screen (3), limit dark safety screen (3) apart from 4 millimeters in cutter head sword face, limit dark safety screen (3) to go up and be provided with the blade sensing scale (7) consistent, to help to judge the cutter head direction with the blade direction with the head end of rear handle (1).

Claims

1, a kind of ligamenta flava incision knife, it is characterized in that: form by L type cutter head (5), mid link (2) and rear handle (1), the inboard of cutter head (5) is for to go the curved blade (4) of reverse cut, its back is the narrow limit of passivity, nose-circle is blunt, be provided with outstanding annular between blade (4) and the connecting rod (2) and limit dark safety screen (3), it is provided with the blade consistent with the blade direction and points to scale (6).

2, ligamenta flava incision knife as claimed in claim 1 is characterized in that: the head end of described rear handle (1) is provided with the blade consistent with the blade direction and points to scale (7).