CN101869504A - Three-dimensional guiding method for use in orthopaedic operation and guider thereof - Google Patents

Abstract

The invention discloses a three-dimensional guiding method for use in an orthopaedic operation and a guider thereof. In the invention, an acceleration sensor and a magnetic field sensor are fixedly arranged on an operating instrument, wherein the acceleration sensor acquires gravity acceleration components corresponding to the axes of the operating instrument, and the magnetic field sensor acquires the magnetic field components corresponding to the axes of the operating instrument; the acquired gravity acceleration components and magnetic field components are converted into azimuth angle and sagittal saw angle information which is to be displayed in real time; and real-time three-dimensional orientation guiding is performed according to the displayed azimuth angle and sagittal saw angle information. The guider can be used to help medical care personnel to determine the sizes of azimuth angles and sagittal saw angles in clinic so as to avoid various human errors. Meanwhile, the guider has a small volume and therefore is convenient to carry; and when the guider is used, the medical care personnel can acquire real-time position accurate information, so that the successful rate of an operation can be increased.

Description

A kind of three-dimensional orientation guidance method and guider thereof that is used for bone surgery

Technical field

The present invention relates to a kind of three-dimensional orientation guidance method that is used for bone surgery; The invention still further relates to a kind of three-dimensional orientation guider that uses this method as bone surgery middle auxiliary devices such as the neck of spinal surgery, breast, pedicle of lumbar vertebra puncture and screw are fixing.

Background technology

In the existing bone surgery operation, puncture technique is used very extensive, particularly when carrying out the pedicle operation technique of spinal surgery, must in unique correct bone passage, puncture, thereby make implantation sites such as screw or bone cement accurate, so require the clinicist can determine the sagittal angle and the azimuth of instrumentation accurately.Yet, at present generally all be the size of coming the rough estimate angle by the experience that the doctor observes range estimation, therefore, even the very abundant doctor of experience also can't guarantee the entirely true of angle or accurate substantially.The misplace rate of bibliographical information pedicle screw is between 10%-33.7%, and the complication consequence is serious.The sagittal angle is inaccurate may to be made pedicle nail place intervertebral disc or injures nerve root in the intervertebral foramina, causes internal fixation to lose efficacy or the sensorimotor function obstacle; Azimuth (leaning angle) is excessive or too small, can make pedicle nail enter in the canalis spinalis or passes the vertebral body outer wall, injures trunk and internal organs in spinal cord and the abdomen, causes serious consequence.

The patent No. is that 9724488.1 Chinese utility model patent, the patent No. are that 200620024102.8 Chinese utility model patent, the patent No. are that 200920101434.5 Chinese utility model patent discloses several auxiliary device that are used for the fixation of pedicle operation, but be same type basically, difference is material, and is realizing technologic improvement.Wherein, the patent No. is the auxiliary device of the disclosed a kind of mechanical type fixation of pedicle operation of 9724488.1 Chinese utility model patent: by regulating screw bolt and nut on connecting plate and the location-plate with location-plate, fixing angle and the lateral separation to keep adjusting of connecting plate and bent plate.During operation, the card punch in the pilot hole on the mounting angle plate is that institute is to the position.The weak point of this auxiliary device is:

1. before punching, fix angle and lateral separation, can not accomplish in time to adjust this angle and lateral separation according to the difference of concrete individuality.

2. whole device is by wood, and screw and nut constitutes.Be difficult to guarantee its inherent accuracy from the physical characteristic of material own; Through adding the instrument precision in man-hour, influence the precision of its device equally again.

3. medical personnel's difference in operation, being difficult to require each user of service is to observe to read rule reading scale, introduces personal error again from reality is used.

4. because location-plate and chain connecting plate, and bent plate is to fix by the mode of screw and nut, very difficult assurance before use with use, can not produce relative displacement, and cause the deviation on the orientation angle owing to the effect of external force.

5. from the description of the structure of its device itself, determine that its volume is excessive, not portable, can not provide dynamic positional information to make medical personnel in time adjust angle and satisfy the concrete condition requirement, and use relative very complicated according to individual variation.

6. its device must be anchored on the bone structures such as spinous process, only being suitable in the open surgery corresponding anatomic landmark obtains under the clear situation about appearing, can't be applied to the extensive at present minimally invasive spine surgical operation that rises, as: art formulas such as percutaneous cervical arc root screw fixation, percutaneous vertebroplasty, percutaneous kyphoplasty art.

Summary of the invention

The purpose of this invention is to provide a kind of three-dimensional orientation guidance method that can real-time prompting instrument positions situation, can be in clinical assist personnel accurately determine sagittal angle and azimuthal size of instrument positions to realize accurately guiding.

Another object of the present invention is to provide the bone surgery three-dimensional orientation guider of realizing said method.

For realizing the object of the invention, the technical solution adopted in the present invention is as follows: a kind of three-dimensional orientation guidance method that is used for bone surgery, by fixed installation acceleration transducer and magnetic field sensor on operating theater instruments, obtain the gravitational acceleration component of each correspondence of operating theater instruments by acceleration transducer, magnetic field sensor obtains the magnetic-field component of each correspondence of operating theater instruments; With the gravitational acceleration component that obtains with magnetic-field component is converted to the azimuth and the sagittal angle information shows in real time, carry out the directed guiding of real-time three-dimensional again according to azimuth that shows and sagittal angle information.

The present invention also realizes guiding calibration in real time by the setting measurement reference point, specifically is the azimuth and the sagittal angle information that obtain current location are preserved, as the witness mark of next orientation measurement; And the difference of the angle information of the witness mark of the angle information that should measure next time and storage setting is as content displayed.

The present invention handles the azimuth and the mistake shape angle information that obtain and demonstration by being wirelessly transmitted to host computer, provides more detailed information, for medical personnel's reference.

Before the present invention uses, in environment for use, will be fixed with pick off around apparatus rotate a circle in the horizontal direction, carry out pick off and calibrate automatically, to obtain more accurate data.

The computational methods that azimuth that the gravitational acceleration component that obtains and magnetic-field component are converted to apparatus of the present invention and sagittal angle information are adopted are:

$\∠B=\arctan \frac{g(h_x{g}_y-h_y{g}_x)}{h_z({g_x}^2+{g_y}^2)-g_z(h_x{g}_x+h_y{g}_y)}$

Wherein:$g_z=\sqrt{g^2-{g_x}^2-{{\mathrm{<figure-callout\; label="g\; y"\; filenames="HSA00000161508900031.png"\; state="\{\{state\}\}">g</figure-callout>}}_y}^2}$

$\&angle;A=\arctan \frac{\sqrt{{g_x}^2+{g_y}^2}}{g_z}$

Wherein, ∠ B is the azimuth of apparatus, and ∠ A is the sagittal angle, g_x, g_y, g_zBe respectively the component that acceleration transducer obtains at x, y, z axle, h_x, h_y, h_zBe the component of magnetic field sensor in x, y, the acquisition of z axle.

A kind of bone surgery three-dimensional localization guider that uses the described method of claim 1, the sensor unit, microcontroller processor and the display unit that comprise power supply unit, form by acceleration transducer and magnetic field sensor, be fixed in sensor unit on the apparatus and obtain component of acceleration and magnetic field strength component under the geographic coordinate system, and transfer to micro controller unit and handle, be converted to the azimuth and the sagittal angle information of apparatus, azimuth and sagittal angle information transfer to display unit and show.

Guider of the present invention also comprises wireless transmission unit, by wireless data transmission unit azimuth and sagittal angle information are transferred to host computer and carry out other processing, also corresponding data is shown on host computer simultaneously,, provide medical personnel reference to obtain more information.

Power supply unit of the present invention is the wireless charging type power supply unit, comprises prime part and back level part, and the prime part adopts way of electromagnetic induction to be connected with back level part, when power supply uses up, need not dismantle charging like this, makes things convenient for the use of guider.

The unitary back of wireless power of the present invention level part is fixed on the apparatus with the printed circuit board (PCB) that described sensor unit, microcontroller, wireless data transmission unit are packaged as a whole, the position that the axis of printed circuit board (PCB) overlaps with the axis of entire equipment apparatus is to reduce measurement error.

Described acceleration transducer can adopt two or 3-axis acceleration sensor; Described magnetic field sensor adopts the three-axle magnetic field pick off.

The present invention utilizes magnetic north direction and gravity direction and magnetic west to setting up a geographic coordinate system, is used as the absolute reference system of this device.Record real-time weight component of apparatus and magnetic-field component under absolute coordinate system by acceleration transducer and magnetic field sensor, again by the transformational relation between apparatus body coordinate system and the geographic coordinate system, through mathematic(al) manipulation, thereby extract azimuth and sagittal angle information.

The present invention can assist personnel accurately determine sagittal angle and azimuthal size in clinical, realize guiding in real time, the positioning accuracy height; And can carry out real time calibration, and avoided various human error, simultaneously, volume of the present invention is little, is easy to carry.By the present invention, medical personnel can obtain the success rate that real-time position accurate information improves operation.

Description of drawings

The present invention is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is a composition frame chart of the present invention;

Fig. 2 is two coordinate systems of institute of the present invention foundation, and concerns sketch map between azimuth and sagittal angle and this two coordinate systems;

Fig. 3 converts geographic coordinate system to for the present invention the process sketch map of apparatus body coordinate system;

Fig. 4 is the output result's of the embodiment of the invention a flow chart.

The specific embodiment

Now by coming comparatively complete explaination the present invention with reference to the accompanying drawings, exemplary embodiment of the present invention shown in it.

A kind of three-dimensional orientation guidance method that is used for bone surgery that the present invention proposes, by fixed installation acceleration transducer and magnetic field sensor on operating theater instruments, obtain the gravitational acceleration component of each correspondence of operating theater instruments by acceleration transducer, magnetic field sensor obtains the magnetic-field component of each correspondence of operating theater instruments; With the gravitational acceleration component that obtains with magnetic-field component is converted to the azimuth and the sagittal angle information shows in real time, carry out the directed guiding of real-time three-dimensional again according to azimuth that shows and sagittal angle information.

The computational methods that azimuth that the gravitational acceleration component that obtains and magnetic-field component are converted to apparatus and sagittal angle information are adopted are:

$\&angle;B=\arctan \frac{g(h_x{g}_y-h_y{g}_x)}{h_z({g_x}^2+{g_y}^2)-g_z(h_x{g}_x+h_y{g}_y)}$

Wherein:$g_z=\sqrt{g^2-{g_x}^2-{{\mathrm{<figure-callout\; label="g\; y"\; filenames="HSA00000161508900031.png"\; state="\{\{state\}\}">g</figure-callout>}}_y}^2}$

$\&angle;A=\arctan \frac{\sqrt{{g_x}^2+{g_y}^2}}{g_z}$

Wherein, ∠ B is the azimuth of apparatus, and ∠ A is the sagittal angle, g_x, g_y, g_zBe respectively the component that acceleration transducer obtains at x, y, z axle, h_x, h_y, h_zBe the component of magnetic field sensor in x, y, the acquisition of z axle.

Because what measure is under the geographic coordinate system condition, through the resulting angle information of conversion, and in a concrete measurement event, magnetic north pole in the geographic coordinate system is constant all the time, and the measurement event orientation is at random, general by patient's orientation of being lain and patient's self conditional decisions such as anatomical position, therefore in the actual guiding process, make things convenient for surgeon to obtain required navigation information in real time by selected witness mark position way.

Generally need to measure the angle information of the symmetric position of reference point both sides, measure therefore that to begin to locate this location point be the reference position, with the angle information of desired position on the symmetric position that conveniently finds its both sides.Specifically be to obtain the azimuth of current location and sagittal angle information witness mark as next orientation measurement.Can be by preserving current position angle information mode, the current location of preserving is exactly the reference point that will set.After having preserved reference point, continuous measurement position angle information, and wireless transmission and demonstration simultaneously.Whenever carry out once all after dates of such measurement-demonstration-transmission, detect once whether need to reset witness mark, can repeat measuring period.

For obtaining higher certainty of measurement, when being installed, calibrates by pick off, mainly each of each pick off calibrated, promptly calibrate firmly, then the factor of calibrating is cured in the internal memory of pick off, when moving, program can call; Before another is to use, carry out the semi-automatic calibration of use location, user is in environment for use, equipment is rotated a circle slowly at horizontal level, and pick off can write down related data automatically, and calibrate automatically inside, and, be used for actual test with the calibration factor maintenance.At a pick off, under technology and the guaranteed situation of element concordance, can replace with the calibration factor that known pick off carries.

The difference of the angle information of the witness mark that the angle information and the storage of current this measurement can be set is as content displayed, be that this is measured with respect to the half-convergency of witness mark or changes the angle relatively, rather than actual azimuth and sagittal angle, therefore, the shown information of taking measurement of an angle just can be, and also can be negative.For timing is represented then to represent to be rotated counterclockwise an angle with respect to reference point when being negative with respect to angle of reference point clockwise rotation.And at the beginning of using the beginning, owing to do not set reference point, the initial value of this reference point is 0, and therefore before user was not provided with new witness mark, data presented was exactly true bearing angle and sagittal angle.

Utilize bone surgery three-dimensional localization guider such as Fig. 1 of said method, the sensor unit 4,microcontroller 5, wireless data transmission unit 7 and the display unit 6 that comprise power supply unit 1, form byacceleration transducer 2 and magnetic field sensor 3, power supply unit 1 is given other component units power supplies, be fixed in sensor unit 4 on the apparatus and obtain component of acceleration and magnetic field strength component under the geographic coordinate system, and transfer tomicro controller unit 5 and handle, be converted to the azimuth and the sagittal angle information of apparatus, azimuth and sagittal angle information show in real time at display unit; And send to host computer by wireless data transmission unit 7 and be for further processing, to show more detailed information.

Power supply unit 1 is divided into prime part and back level part, and the prime part does not directly link to each other with back level part, but by the principle that electromagnetism is changed mutually both is connected.Prime partly is to be made of AC-DC circuit module, primary coil drive circuit, primary coil; Back level part is made of secondary coil, current rectifying and wave filtering circuit, mu balanced circuit, lithium electricity charge protection and cue circuit.In the use, lithium battery powers for other unit, when the lithium power consumption is not enough, can detect and point out user to give back level charging by prime automatically.With the printed circuit board (PCB) that the back level part of wireless power unit 1 and sensor unit 4,microcontroller 5 and wireless data transmission unit 7 are packaged as a whole, pick off should be arranged in the center of printed circuit board (PCB); Because pick off is subject to ferrum, the influence of magnetic material in order to reduce this interference, is arranged in the end of printed circuit board (PCB) with wireless data transmission unit, as much as possible from the farthest of pick off; Device around the placement sensor should be avoided all around occurring in 10 millimeters at pick off; The fixed position of printed circuit board (PCB) on apparatus will guarantee that the axis of printed circuit board (PCB) overlaps with the axis of entire equipment apparatus, otherwise will bring error to measurement.Whole printed circuit board (PCB) does not need the lead and the external world to get in touch, thereby realizes wireless transmission, and the wireless transmission corresponding data shows on display unit, carries out other processing to host computer simultaneously and respective data transfer.Above-mentioned power supply unit 1 also can adopt other forms of working power commonly used, or minicell etc. independently.

Acceleration transducer 2 in the sensor unit 4 adopts appearance formula MEMS acceleration transducer, in the present embodiment, what we adopted is ST (meaning method) company's acceleration transducer, also can use the acceleration transducer of the MEMS of other company, as: the MEMS of AD company acceleration transducer, the MEMS acceleration transducer of Freescale company.

Magnetic field sensor 3 in the sensor unit 4 adopts the reluctance type magnetic field sensor, and what use in the present embodiment is the earth magnetism integration module of ST (meaning method) company, also can use the giant magnetoresistance magnetometer of the HMC of Honeywell Inc. series magnetometer and Infineon company.

Microcontroller 5 is the high performance microprocessor of super low-power consumption, and we use the MSP430 series microprocessor of TI company in the present embodiment, also can use the microprocessor of atmel corp, NXP company, Yi Fa company or AD company.

What display unit 6 adopted is undersized liquid crystal, and corresponding Chinese prompt character and symbol are arranged, and can certainly take other to show carrier, and display unit can be installed on and make things convenient on the apparatus that medical personnel conveniently watch.

The radio frequency that has the industry lowest power consumption (RF) the chip CC1000 that wireless transmission unit 7 adopts TI companies also can pass through other wireless data transmission technology, as: infrared, bluetooth, zigbee, WIFI etc.

Operation principle of the present invention is: ST (meaning method) company's 3-axis acceleration sensor is used for obtaining the component of acceleration under the geographic coordinate system of apparatus in whole process; Three earth magnetism integration module pick offs of ST (meaning method) company obtain the magnetic-field component under geographic coordinate system in the whole process; Six components that the MSP430 series microprocessor is obtained sensor unit 4 are done corresponding mathematical operation and are handled, and obtain sagittal angle and azimuthal information; Indicate according to the user and to differentiate current measured value and whether need to store and still need show, and the wireless transmission unit that constitutes by radio frequency chip CC1000 is carried out exchanges data in 433,000,000 frequency ranges or other frequency range and host computer by undersized liquid crystal display screen.

Fig. 2 is the geographic coordinate system of institute's foundation among the present invention and the sketch map of apparatus body coordinate system.This geographic coordinate system and apparatus body coordinate system all are mutually orthogonal cartesian coordinate systems.Wherein, apparatus body coordinate system OX_bY_bZ_bBeing positioned on the apparatus, is to change the coordinate system of moving with the apparatus attitude.Its longitudinal axis OZ_bFor apparatus axially, point to the upper end of apparatus.OX_bAnd OY_bAxle is in the sagittal plane, and is orthogonal.Another coordinate system OX_rY_rZ_rBe geographic coordinate system, OX_rAxle points to magnetic north, OY_rAxle points to earth magnetism west, OZ_rAxle is the ground vertical line, points to the sky.This is the reference frame that is used to represent the apparatus trend.Two coordinate systems meet right hand rule.

According to definition, ∠ A apparatus sagittal angle is apparatus coordinate system axle OZ_bWith geographic coordinate system axle OZ_rBetween angle.

Magnetic azinuth is that apparatus axis is to OZ_bWith geographical coordinate axle OZ_rPlane, place OZ_bZ_rMean north axle OX with geographical coordinate_rWith geographic coordinate system axle OZ_rPlane, place OX_rZ_rBetween angle, as the ∠ B angle among Fig. 2, clockwise, from north orientation east corner for just.

The tool face azimuth is with apparatus coordinate system OZ_bBe axle, spinning clockwise is from apparatus axis OZ_bPlane OZ hangs down on the ground at place_bZ_rForward to by apparatus coordinate system axle OZ_bWith axle OX_bThe plane OX at place_bZ_bBetween angle ∠ C be the tool face azimuth, clockwise for just, the power of weighing again tool face azimuth is as the ∠ C among Fig. 2.

Fig. 3 illustrates geographic coordinate system OX_rY_rZ_rThrough reaching the coordinate system OX of apparatus body after three rotation of coordinate_bY_bZ_bProcess.

Step1 explanation rotation for the first time is with OZ_rBe axle, with axle OX_rRotate an azimuth ∠ B clockwise eastwards.Coordinate system OX after the rotation₁Y₁Z₁, axle OZ_rWith OZ₁Axle overlaps.

Step2 explanation rotation for the second time is with OY₁Be axle, make OZ₁(OZr) axle rotates a sagittal angle ∠ A to OZ₂, the coordinate after the rotation is OX₂Y₂Z₂, OY₂Axle promptly is an OY₁

Step3 explanation rotation for the third time is with OZ₂Be axle, a tool face azimuth ∠ C turns clockwise.Reach apparatus coordinate system OX at last_bY_bZ_bOZ_bAxle promptly is an OZ₂

Rotate to be rotation for the third time, it changes the tool face azimuth, does not change magnetic azinuth and apparatus sagittal angle.Rotation for the second time, it only changes the sagittal angle of apparatus, and magnetic azinuth is constant, the tool face azimuth changes into zero.The visible bearing angle by the first time anglec of rotation determined, apparatus sagittal angle then by the second time anglec of rotation determined.The anglec of rotation then is the tool face azimuth for the third time.

The gravity acceleration g vector is at geographic coordinate system OZ_rOn the axle, earth's magnetic field h vector is then at OX_rZ_rIn the plane.H is at OX_rOn horizontal component be-h_N, at OZ_rVertical component on the axle is h_N

Bone surgery three-dimensional localization guider can adopt 3-axis acceleration sensor and three magnetometric sensors, also can adopt two axle acceleration sensors and three magnetometric sensors.The former can carry out the detection of comprehensive attitude parameter, and sagittal angular measurement scope is the 0-180 degree.And the latter can only carry out the detection of attitude parameter in about 85 degree scopes from 0 at the sagittal angle.Three acceleration sensors of meaning method (ST) company that adopts in the present embodiment and magnetometric sensor, thus its sagittal angular measurement scope at the 0-180 degree, the azimuth determination scope is at the 0-360 degree.

By pick off 4 resultant component of acceleration (g_x, g_y, g_z) and magnetic-field component (h_x, h_y, h_z), according to above-mentioned geographic coordinate system and apparatus body coordinate system change procedure and sagittal angle and azimuthal relation, can record the azimuth, its computing formula:

$\&angle;B=\arctan \frac{g(h_x{g}_y-h_y{g}_x)}{h_z({g_x}^2+{g_y}^2)-g_z(h_x{g}_x+h_y{g}_y)}---\left(1\right)$

Wherein:$g_z=\sqrt{g^2-{g_x}^2-{{\mathrm{<figure-callout\; label="g\; y"\; filenames="HSA00000161508900031.png"\; state="\{\{state\}\}">g</figure-callout>}}_y}^2}$

The sagittal angle, its computing formula:

$\&angle;A=\arctan \frac{\sqrt{{g_x}^2+{g_y}^2}}{g_z}---\left(2\right)$

The present invention also can be used in combination software, and described software is presented as the readable code on computer and the microcontroller computer-readable recording medium.Described computer-readable recording medium is any data memory device, and this storage device can store the data that can have computer and microprocessor to read thereafter.Microprocessor computer-readable recording medium example comprises flash memory (FLASH), random access memory (RAM), read only memory (ROM); The example of computer-readable medium comprises read only memory (ROM), random access memory (RAM), CD-ROM, tape, light data storage device and carrier wave (for example: by the Internet transmission data).Computer-readable recording medium can be distributed on the network that is connected to processor, thereby makes readable code distributed storage and execution.As Fig. 4, treatment step comprises:

(1) initialization: the i.e. retention value zero setting of setting measurement reference point in depositor;

(2) acceleration transducer obtains the gravitational acceleration component of each correspondence, and magnetic field sensor obtains the magnetic-field component of each correspondence;

(3) gravitational acceleration component and the magnetic-field component of obtaining is converted to required azimuth and loses the shape angle information;

(4) judge whether to calibrate, promptly, if desired, the retention value of witness mark in depositor is updated to current location whether with the witness mark of current location as measurement next time;

(5) relative bearing and mistake shape angle information are shown on display unit, and be transferred to host computer by wireless transmission unit.

The present invention utilizes magnetic north direction and gravity direction and magnetic west to setting up a geographic coordinate system, is used as the absolute reference system of this device.Record real-time three weight component (g of apparatus under absolute coordinate system by acceleration transducer 4 and magnetic field sensor 3_x, g_y, g_z) and magnetic-field component (h_x, h_y, h_z), again by the transformational relation between apparatus body coordinate system and the geographic coordinate system,, just can extract azimuth and sagittal angle information through mathematic(al) manipulation.

Although illustrate especially with reference to exemplary embodiment of the present invention; it should be appreciated by those skilled in the art; the foregoing description only limits to content of the present invention is described; and unrestricted protection scope of the present invention; under the prerequisite that does not break away from inventive concept; the present invention is carried out equivalence replace, all belong to protection scope of the present invention.

Claims (10)

1. three-dimensional orientation guidance method that is used for bone surgery, it is characterized in that: by fixed installation acceleration transducer and magnetic field sensor on operating theater instruments, obtain the gravitational acceleration component of each correspondence of operating theater instruments by acceleration transducer, magnetic field sensor obtains the magnetic-field component of each correspondence of operating theater instruments; With the gravitational acceleration component that obtains with magnetic-field component is converted to the azimuth and the sagittal angle information shows in real time, carry out the directed guiding of real-time three-dimensional again according to azimuth that shows and sagittal angle information.

2. three-dimensional orientation guidance method according to claim 1, it is characterized in that: also realize guiding calibration in real time by the setting measurement reference point, specifically be that the azimuth and the sagittal angle information that obtain current location are preserved, as the witness mark of next orientation measurement; And the difference of the angle information of the witness mark of the angle information that should measure next time and storage setting is as content displayed.

3. three-dimensional orientation guidance method according to claim 1 is characterized in that: the azimuth and the mistake shape angle information that obtain are handled and demonstration by being wirelessly transmitted to host computer.

4. three-dimensional orientation guidance method according to claim 1 is characterized in that: before the use, in environment for use, will be fixed with pick off around apparatus rotate a circle in the horizontal direction, carry out pick off and calibrate automatically.

5. three-dimensional orientation guidance method according to claim 1 is characterized in that: the computational methods that described azimuth that the gravitational acceleration component that obtains and magnetic-field component are converted to apparatus and sagittal angle information are adopted are:

$\&angle;B=\arctan \frac{g(h_x{g}_y-h_y{g}_x)}{h_z({g_x}^2+{g_y}^2)-g_z(h_x{g}_x+h_y{g}_y)}$

Wherein:$g_z=\sqrt{g^2-{g_x}^2-{g_y}^2}$

$\&angle;A=\arctan \frac{\sqrt{{g_x}^2+{g_y}^2}}{g_z}$

Wherein, ∠ B is the azimuth of apparatus, and ∠ A is the sagittal angle, g_x, g_y, g_zBe respectively the component that acceleration transducer obtains at x, y, z axle, h_x, h_y, h_zBe the component of magnetic field sensor in x, y, the acquisition of z axle.

6. bone surgery three-dimensional localization guider that uses the described method of claim 1, it is characterized in that: the sensor unit, microcontroller processor and the display unit that comprise power supply unit, form by acceleration transducer and magnetic field sensor, be fixed in sensor unit on the apparatus and obtain component of acceleration and magnetic field strength component under the geographic coordinate system, and transfer to micro controller unit and handle, be converted to the azimuth and the sagittal angle information of apparatus, azimuth and sagittal angle information output to display unit and show in real time.

7. bone surgery three-dimensional localization guider according to claim 6, it is characterized in that: also comprise wireless transmission unit, by wireless data transmission unit azimuth and sagittal angle information are transferred to host computer and carry out other processing, simultaneously and corresponding data is shown on host computer.

8. according to claim 6 or 7 described bone surgery three-dimensional localization guiders, it is characterized in that: described power supply unit is the wireless charging type power supply unit, comprises prime part and back level part, and the prime part adopts way of electromagnetic induction to be connected with back level part.

9. bone surgery three-dimensional localization guider according to claim 8, it is characterized in that: the unitary back of described wireless power level part is fixed on the apparatus with the printed circuit board (PCB) that described sensor unit, microcontroller, wireless data transmission unit are packaged as a whole, and the axis of printed circuit board (PCB) overlaps with the axis of entire equipment apparatus.

10. bone surgery three-dimensional localization guider according to claim 6 is characterized in that: described acceleration transducer adopts two or 3-axis acceleration sensor; Described magnetic field sensor adopts the three-axle magnetic field pick off.

Images