CN2680212Y

CN2680212Y - Screw guiding and positioning device for vertebral arch pedicle

Info

Publication number: CN2680212Y
Application number: CN 03237809
Authority: CN
Inventors: 江永发
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-30
Filing date: 2003-09-30
Publication date: 2005-02-23
Anticipated expiration: 2013-09-30

Abstract

The utility model discloses a screw guiding and positioning device for vertebral arch pedicle, comprising a radian ruler, a slide bar, a bone spicule, a slide bar fixing block and a sliding block. The slide bar is provided with graduations. The radian ruler is provided with a sliding slot. The radian ruler is provided with graduations. The radian ruler in the sliding slot is movably connected with the slide bar by the slide bar fixing block. The radian ruler can move up and down on the slide bar or be fixed on the slide bar. The bone spicule is movably connected with the radian ruler in the sliding slot by the sliding block. The sliding block does the circular motion in the sliding slot, driving the bone spicule move. In operation, the slide bar is fixed at the point O and the radian ruler is moved downward by a b distance to exactly find the pin injecting point. The operation is simplified and the accuracy is improved.

Description

A kind of pedicle screw orienting locator

Technical field:

This utility model relates to a kind of surgical clinical medical apparatus and instruments, particularly relates to the location and the guidance system of cervical arc root screw internal fixing system in a kind of spinal surgery.

Background technology:

Over nearly 20 years, the development of the internal fixation system of pedicle screw has promoted the development of spinal surgery technology greatly.Although existing technology has their own characteristics each, used material also is not quite similar, and the key of operation still is in the implanted prosthetics of pedicle screw, and the most important factor of the technical merit that pedicle screw is implanted decision pedicle of vertebral arch internal fixation system success or not.Bring into use till now from the pedicle screw implanted prosthetics, though through continuous technological improvement, but implant surgery still relies on free-hand open circuit, entirely with the experience of implementing implant surgery person and sensation at that time, the shortcoming of this way is: the accuracy rate of implanting in the operation is difficult to determine, repeatability is not strong, and each one success rate is different; Even screwing in the accuracy rate of screw on different periods, different pedicle of vertebral arch, veteran operator also is difficult to guarantee; Accuracy for the position that guarantees screw and direction often needs repeatedly X line perspective in operation in addition, prolonged the time of operation exponentially, increase the number of times of patient and medical worker X line perspective, not only increased the cost of curing, but also injured patient's health; Because the direction of open circuit awl and/or the degree of depth are difficult to grasp, in case damaged nerve and blood vessel, consequence can't be retrieved especially simultaneously; The diameter of pedicle of vertebral arch is limited, and pulp cavity is narrow, if just can be screwed into position accurately through after repeatedly changing its course, then greatly reduces the intensity of internal fixation, has caused the failure of internal fixation.And the above-mentioned defective overwhelming majority is to be transverse diameter than the footpath is little up and down by the particularity on the pedicle of vertebral arch anatomy, make implement operator horizontal plane angle when screwing in pedicle screw refer to the sagittal angle of pedicle of vertebral arch axis and cone grasp forbidden due to.

At above problem, Amiot nineteen ninety-five with computer aided technique (computer-assistedspine surgery, CASS) be used for spinal surgery, test the research of aspect, promptly carry out the CT scan cone before the operation, set up the 3-D view of cone, draft the implantation route of PS, use detector labelling pedicle of vertebral arch in the operation, and combine with 3D rendering, be presented on the screen, make pedicle screw (PS) but implant surgery overall process immediately monitoring.And surgical navigation systems (Surgery navigation system) is further developing of CASS, is applied to neurosurgery the earliest, because of its correct polarization that height is arranged, is used by spinal surgery very soon.Stealth Station (Sofamor danek, menphis, Tennessee USA) is latest generation spinal surgery navigation system, and there is a special bone folder (boneclamp) in this system, enclose infrared light-emitting diode, bone folder can protruding or other bone structure of interlinear notes sour jujube, by three-dimensional digitizer image-guidance system, can monitor the overall process of PS implantation on display, at any time revise PS location, directed, depthkeeping, reach best surgical effect.But, the said equipment is very expensive, have only only a few hospital to buy, surgery cost also is very expensive, have only the only a few patient to bear, and operation is comparatively complicated, needs the personnel of special special training to use this equipment, thereby can not satisfy present clinical needs at all, use not general.

Summary of the invention:

The purpose of this utility model provides a kind of accuracy rate height, grasps convenient, equipment pedicle screw locating guider simple, cheap, simple to operate.

The accuracy rate height of implanting, can repeat, the success rate height of implant surgery, reduce the patient infection chance, reduce and cure cost, reduce malpractice, increase the pedicle screw locating guider of the intensity of pedicle of vertebral arch internal fixation system.

Realize that the purpose of this utility model pedicle screw locating guider is made of radian chi, slide bar, spicule, slide bar fixed block, slide block etc., be marked with scale on the slide bar, on the radian chi, offer chute, be marked with scale on the radian chi, the radian chi connects by slide bar fixed block and slide bar are movable in chute, the radian chi can also can be fixed on the slide bar moving up and down on the slide bar, spicule connects with the radian chi is movable in the chute of radian chi by slide block, slide block is made circular motion in chute, drive the spicule motion.

As improvement of the present utility model, on spicule, be provided with and limit the additional stopping means that spicule inserts.

The working method of guider is, before the art, by determining slide bar on the CT sheet at epicentral fixing point O, it is horizontal plane angle θ that the best of measuring pedicle screw screws in the angle, measure simultaneously the best go between pin mark I and the fixing point O apart from a.The O point promptly is equivalent to vertebral body spinous process and vertebral plate connecting place, about can measure respectively.Determine the scale θ of slide block on the radian chi in the art earlier, again by adjusting the radian chi in the position on the slide bar and the position of spicule on slide block, make the end points of slide bar and spicule meet at the O point, at this moment, angle between slide bar and the spicule is θ, write down radian chi scale 1 at this moment, according on the CT sheet, obtain apart from a and angle theta, calculate the distance b value according to formula b=a/tg θ, move down the radian chi, simultaneously with upwards pulling of spicule along slide bar, the radian chi is moved down the b distance to scale 2 positions from the position of slide bar scale 1, at this moment, spicule and slide bar outwards move, and arrive the best at last and go into pin mark I.Entry point and I and the best are gone into after pin angle θ determines, can pierce spicule on the set position safely with electric drill.The degree of depth can limit by the additional stopping means that is arranged on the spicule, prevents into pin dark excessively.

Because O point determines, and θ angle and b distance can accurate Calculation obtain before operation, only need in the operation slide bar is fixed on the O point and the radian chi is moved down a distance b just can accurately find into pin mark, perform the operation greatly in simplification and accuracy improves greatly.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a plan structure sketch map of the present utility model

Sketch map when Fig. 3 is original state.

Fig. 4 is the sketch map when finding into pin mark.

Fig. 5 is the vertebra sketch map of CT sheet.

The specific embodiment:

As shown in Figure 1 and Figure 2, realize that the purpose of this utility model pedicle screw locating guider is made of radian chi 1, slide bar 2, spicule 3, slide bar fixed block 4, slide block 5 etc., on radian chi 1, offer chute 6, be marked with scale on the radian chi 1, radian chi 1 connects by slide bar fixed block 4 and slide bar 2 activities in chute 6, radian chi 1 can also can be fixed on the slide bar 2 moving up and down on the slide bar 2, spicule 3 connects with 1 activity of radian chi in the chute 6 of radian chi 1 by slide block 5, slide block 5 is made circular motion in chute 6, drive spicule 3 motions.

Extremely shown in Figure 5 as Fig. 2, the work process of guider is at first, pass through before the art determining the fixing point O of slide bar 2 on vertebral body 7 on the CT sheet, the best screw-in angle of measuring pedicle screw is horizontal plane angle θ, measure simultaneously the best go between pin mark I and the fixing point O apart from a, in the art according on the CT sheet, obtain apart from a and angle theta, calculate the distance b value according to formula b=a/tg θ.Determine earlier in the art that the spicule 3 and the angle of slide bar 2 are θ, adjust the position of radian chi 1 and spicule 3, making the end points of slide bar 2 and spicule 3 meet at the epicentral O point of patient fixes with wing nut, write down radian chi 1 scale A this moment, again radian chi 1 is moved down the b distance from the position of slide bar 2 scales 1 and reach position B, at this moment, 3 on spicule upwards reaches and outwards moves freely, and arrives the best at last and goes into pin mark I.It is all definite that this moment, entry point and I and the best were gone into pin angle θ, can pierce spicule 3 on the set position safely with electric drill.The degree of depth can limit by the additional stopping means that is arranged on the spicule 3, prevents into pin dark excessively.

Claims

1. pedicle screw orienting locator, it is characterized in that constituting by radian chi, slide bar, spicule, slide bar fixed block, slide block etc., be marked with scale on the slide bar, on the radian chi, offer chute, be marked with scale on the radian chi, the radian chi connects by slide bar fixed block and slide bar are movable in chute, the radian chi can also can be fixed on the slide bar moving up and down on the slide bar, slide block can be made circular motion in the chute of radian chi, spicule connects with the radian chi is movable in the chute of radian chi by slide block.

2. pedicle screw orienting locator as claimed in claim 1 is characterized in that being provided with the additional stopping means that limits the spicule insertion on spicule.

3. arbitrary pedicle screw orienting locator as claimed in claim 1 or 2 is characterized in that being provided with fixed wing nut on slide block and slide bar fixed block.