CN2296698Y

CN2296698Y - Screw cutter for intervertebral discs

Info

Publication number: CN2296698Y
Application number: CN 97235949
Authority: CN
Inventors: 滕皋军; 胡玉震
Original assignee: YINGTELEI INDUSTRY Co Ltd NANJING
Current assignee: Yingtelei Industry Co., Ltd., Nanjing
Priority date: 1997-05-06
Filing date: 1997-05-06
Publication date: 1998-11-11
Anticipated expiration: 2007-05-06

Abstract

The utility model relates to a cutter for intervertebral discs, comprising a cutting device which is composed of two sleeve pipes namely inner and outer cutter pipes. The end part of an outer cutter pipe is provided with a side hole, the inner cutter pipe moves in the outer cutter pipe, and accordingly, the tissue extending into a cutter mouth is cut. Two cutter pipes are also respectively connected with a water inlet and a negative pressure suction opening. A thread groove is arranged in the inner cutter pipe, the external diameter of the inner cutter pipe and the internal diameter of the outer cutter pipe are cooperated by sliding, and the inner cutter pipe is supplied with a rotary power by an electric machine. The device is characterized in small tissue damage and high cutting and pumping efficiency, and the device is a cutter which can fundamentally eliminate the pipe blocking phenomenon, and the operation of the utility model is convenient.

Description

Spiral intervertebral disc sickle

This utility model relates to a kind of making of medical apparatus and instruments, relates in particular to the improvement of the structure of percutaneous intervertebral disc sickle.

Existing percutaneous lumbar intervertebral disc electrotome be 1985 by U.S. Ao Nike (Onik Getol.Clin orthop, 1989,238:71-76. clinical orthopedic orthopaedics magazine) invent, since then, the percutaneous lumbar intervertebral disc enucleation has become the important means of treatment prolapse of lumbar intervertebral disc, and extensively carry out at home and abroad, the critical component of its special equipment is the cutter sweep that two sleeve pipes (cutter pipe and outer cutter pipe in can regarding as respectively) are slidingly matched and form, outer cutter pipe has side opening in the end, interior cutter pipe is twitched in the cutter pipe outside, thereby cutting puts in the nucleus pulposus of the edge of a knife from side opening, two cutter pipes also are connected to water inlet and negative pressure outlet respectively, the gapped negative pressure circulating water flow of taking between two pipes, the collection cutting, current flushing and vacuum suction are discharged the tissue of cutting, after this automatically in one, have the apparatus of multiple modified form to come out again, but basic structure is similar.But, the percutaneous lumbar intervertebral disc sickle of the above-mentioned type exists one the common fault that tube chamber stops up takes place in operation easily, this is because must take the passage of current between the inside and outside cutter pipe in, so inside and outside cutter pipe is interlock cutting nucleus pulposus closely, and organizing of cutting down also can only rely on the current scour under the vacuum suction to come out merely.When therefore more tough, often be blocked in easily between the inside and outside cutter pipe, at this moment, must pull down sickle and could get rid of tamper as if the tissue that cuts down.Do like this, not only influenced the process of operation, and increased infection chance.If it is unobstructed in order to improve suction to attempt to increase the caliber of sickle, must increase patient's tissue injury.

The purpose of this utility model be make a kind of to tissue injury little and cutting pumping efficiency height, can fundamentally eliminate the sickle of plugging phenomenon, and easy to operate, cost and making all have superiority, and other purpose of the present utility model is listed in description in addition.

The purpose of this utility model is to realize like this, comprise that the promptly inside and outside cutter pipe of two sleeve pipes cooperates the cutter sweep of forming, outer cutter pipe has side opening in the end, interior cutter pipe moves in the cutter pipe outside, thereby cutting puts in the tissue of the edge of a knife from side opening, two cutter pipes also are connected to water inlet and negative pressure suction inlet respectively, it is characterized in that being provided with thread groove on interior cutter pipe, and interior cutter external diameter of pipe and outer cutter bore are slidingly matched.Wherein, interior cutter pipe taps into aquaporin, and outer cutter pipe connects the negative pressure exhalant canal.

Characteristics of the present utility model are: because two cutter pipes can driving fit, under the rotation of interior cutter pipe, nucleus pulposus can fully be cut, cutting efficiency improves greatly, and along with the rotation of cutter pipe in the screw thread, and the effect of negative pressure water, be easy to be sucked out external under the dual function of the drive that is organized in mechanical force and current that is cut, the medical apparatus and instruments of this special construction can not rely on the enlarged tube footpath just fundamentally to solve the susceptible to plugging problem of tube chamber, this utility model is compared with the sickle of other structure, other characteristics are also arranged, increased the cutting aspiration, the wound to human body when cutting is also minimum, and cost is not high, simple in structure, easy to operate or the like.

The utility model is described in further detail below in conjunction with accompanying drawing with by embodiment:

Fig. 1 is the outer cutter tubular construction sketch map of this utility model

Fig. 2 is a cutter tubular construction sketch map in this utility model

As shown in the figure, the front end 2 of outer cutter pipe 1 seals and makes blunt garden shape, have side opening 3 in the end, and side opening is polished outer blade, be slidingly matched with interior cutter pipe in the outer cutter pipe, interior cutter pipe injects outer tube from the base 4 of outer cutter pipe, be provided with negative pressure straw mouth 5 on base, the external diameter of outer cutter pipe has plurality of specifications, and the outer cutter pipe diameter of the thinnest specification is about 2mm, can select suitable apparatus minimum to guarantee patient's wound influence, base intracavity becomes horn-like 6 transition to outer lumen.The cutter pipe box is gone into the work of outer cutter pipe internal rotation in during work.

In the structure chart of interior cutter pipe 7; spiral-form slot 8 extends to whole outer tube; up to horn mouth; thread groove has multiple choices; the edge of principal security groove and the outer tube edge of a knife have good tangent effect, if the corrugated tubing that make with triangle or rectangle in the cross section of interior cutter pipe does not also exceed protection domain of the present utility model.

The width of screw thread is 1.5-5mm for well, and screw thread the length of a circumference be 5-12mm for well, generally get 8-10mm, among the figure in the screw thread cross sectional shape of cutter pipe be semicircle or approximate half-circular, crescent etc.The shape in cross section also has multiple choices, as long as guarantee to have a cutting edge, as can be used on and only keep a corner cut on the semicircle, like this add man-hour may be more convenient, as become a thread groove earlier in mould, reprocessing a limit is cutting edge, the leading section of interior cutter pipe is an opening, in order to supply water, this mouthful is set at the far-end of outer cutter pipe side opening, can increase the negative pressure suction force to intervertebral disc.Interior pipe is also affixed with pedestal.

Interior cutter pipe also can be passed through a shaft joint or power transmission shaft driven rotary by the direct driven rotary of motor.

Claims

1. intervertebral disc sickle, comprise that the promptly inside and outside cutter pipe of two sleeve pipes cooperates the cutter sweep of forming, outer cutter pipe has side opening in the end, interior cutter pipe moves in the cutter pipe outside, thereby cutting puts in the tissue of the edge of a knife from side opening, two cutter pipes also are connected to water inlet and negative pressure suction inlet respectively, it is characterized in that being provided with thread groove on interior cutter pipe, and interior cutter external diameter of pipe and outer cutter bore are slidingly matched.

2. by the described intervertebral disc sickle of claim 1, the cutter pipe taps into aquaporin in it is characterized in that, outer cutter pipe connects the negative pressure exhalant canal.

3. by claim 1,2 described intervertebral disc sicklies, the cross section of cutter pipe is semicircular corrugated tubing in it is characterized in that.

4. by claim 1,2 described intervertebral disc sicklies, the leading section of cutter pipe is an opening in it is characterized in that, in order to supply water, this mouthful is set at the far-end of outer cutter pipe side opening.

5. by claim 2,3 described intervertebral disc sicklies, the width of cutter gas thread groove is 1.5-5mm in it is characterized in that, and screw thread is 5-12mm in the length of a circumference.

6. by claim 1,2 described intervertebral disc sicklies, the cutter pipe is by motor or by a shaft joint or power transmission shaft driven rotary in it is characterized in that.