CN104116481A - Adjustable magnetic field generating device under capsule endoscope tracking system - Google Patents
Adjustable magnetic field generating device under capsule endoscope tracking system Download PDFInfo
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- CN104116481A CN104116481A CN201310152785.XA CN201310152785A CN104116481A CN 104116481 A CN104116481 A CN 104116481A CN 201310152785 A CN201310152785 A CN 201310152785A CN 104116481 A CN104116481 A CN 104116481A
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Abstract
An adjustable magnetic field generating device under a capsule endoscope tracking system is connected with a magnetic field sensor module in a capsule in a wireless communication mode. The adjustable magnetic field generating device comprises a magnetic field generating circuit, a time sequence control circuit and a wireless feedback circuit. The output of the time sequence control circuit and the output of the wireless feedback circuit are respectively connected with the magnetic field generating circuit, the time sequence control circuit controls the magnetic field generating circuit to generate an alternating magnetic field in a time division mode, the generated alternating magnetic field is detected and processed through the magnetic field sensor module and is fed back to the magnetic field generating circuit through the wireless feedback circuit, the magnitude of the magnetic field is changed, and the intensity of the magnetic field can be automatically adjusted. The alternating magnetic field with the adjustable magnitude can be provided for the adjustable magnetic field generating device under the capsule endoscope tracking system, the intensity of the magnetic field can be automatically adjusted according to a feedback signal transmitted by a magnetic field sensor, and the tracking precision is improved.
Description
Technical field
The present invention relates to medical apparatus and instruments, relate in particular to the adjustable field generator for magnetic under a kind of capsule endoscope tracking system.
Background technology
Capsule endoscope is researched and developed successfully in 2000 by Given Image company of Israel, and calendar year 2001 has been applied to clinical since authenticating by U.S. FDA more and more widely.Capsule endoscope enters digestive tract from oral cavity, can clearly take the image of esophagus, stomach, large intestine and small intestinal, thereby can complete the inspection to the whole gi system of human body, especially, in the inspection of intestinal tract disease, has established consequence.Capsule endoscope has fundamentally overcome the deficiency that the splanchnoscopy such as traditional gastroscope, intestinal mirror exists, and has not only eliminated detection blind area, can not damage interior cavity tissue, and the fear and painful at heart of having avoided traditional splanchnoscopy to bring to patient.But still there are these some urgent problems in capsule endoscope in clinical practice, when capsule endoscope is swallowed from oral cavity and is checked in body, just in sightless mobile status, we cannot determine its position in vivo, make the indagation doctor cannot the indagation information being obtained by capsule endoscope is corresponding with its indagation position.Therefore capsule endoscope is located to tool accurately and be of great significance, only in this way, surgeon just can perform the operation to patient according to precise positioning.
Because the volume of capsule endoscope own is small, in human body, again in invisible uncontrollable random motion state, cause quite difficulty of its location.To the location of capsule endoscope, studied several different methods both at home and abroad, for example nucleus medical image location technology, fluoroscopic visualization location technology, localization by ultrasonic technology, magnetic field location technology etc.Generally need 5-8 hour because capsule endoscope completes whole digestive tract examining, so these location technologies all exist some shortcomings, as high in cost, complicated operation, human body is easily caused radiation and can not meet the requirement etc. of long-time real-time positioning.
In capsule endoscope AC excitation formula radio tracking system, by the magnetic field of the outer magnet exciting coil generation of the magnetic field sensor detection bodies in capsule, can obtain the orientation of capsule endoscope by solving magnetic field inverse problem.Because magnetic field is with the cube decay of distance, cause receiving three orders of magnitude of dynamic range span of signal, design and develop thus external adjustable alternating magnetic field generating means, the field signal feeding back by magnetic field sensor, the intensity of the alternating magnetic field that adjusting produces automatically.
Summary of the invention
Object of the present invention, exactly in order to address the above problem, provides the adjustable field generator for magnetic under a kind of capsule endoscope tracking system.
To achieve these goals, the present invention has adopted following design: the adjustable field generator for magnetic under a kind of capsule endoscope tracking system, be connected with the magnetic field sensor module wireless telecommunications that are arranged in capsule, comprise magnetic generation circuit, sequential control circuit and wireless feedback circuit; The output of sequential control circuit and wireless feedback circuit is connected respectively magnetic generation circuit, the timesharing of sequential control circuit controlling magnetic field circuit for generating produces alternating magnetic field, the alternating magnetic field producing is detected by magnetic field sensor module, and process, feed back to magnetic generation circuit by wireless feedback circuit again, change the magnetic field size producing, realize the automatic adjusting of magnetic field intensity.
Described magnetic generation circuit comprises microcontroller, wave generator circuit and magnet exciting coil array; The output of microcontroller connects wave generator circuit, and the output of wave generator circuit connects magnet exciting coil array; Microprocessor controls wave generator circuit produces the adjustable sine wave signal of amplitude frequency, and the sine wave signal of generation produces alternating magnetic field through magnet exciting coil array.
Described sequential control circuit comprises microcontroller and multiway analog switch; Microcontroller is connected with multiway analog switch by I/O mouth, and the output of multiway analog switch connects the magnet exciting coil array in magnetic generation circuit; The break-make of microprocessor controls multiway analog switch, makes each magnet exciting coil timesharing closure in wave generator circuit and magnet exciting coil array, and timesharing produces alternating magnetic field.
Described wireless feedback circuit comprises wireless transmitter module and wireless receiving module; Wireless transmitter module is arranged in capsule and is connected with magnetic field sensor module, and wireless receiving module is arranged on external and is connected with magnetic generation circuit; The field signal that wireless transmitter module detects magnetic field sensor module is wirelessly transmitted to external, wireless receiving module receives described field signal and is fed back to magnetic generation circuit, make magnetic generation circuit change the size of the alternating magnetic field producing, realize the automatic adjusting of magnetic field intensity.
Described wave generator circuit comprises D/A module, filter circuit and gain amplifying circuit; Described microcontroller is connected with D/A module by I/O mouth, makes D/A module outfan produce the adjustable square wave of amplitude frequency; The outfan of D/A module connects the input of filter circuit, and filter circuit elimination higher hamonic wave obtains sine wave; The outfan of filter circuit connects gain amplifying circuit, obtains required sinusoidal signal.
Described magnet exciting coil array is arranged and is formed by multiple magnet exciting coil orders, magnet exciting coil is formed by copper wire winding, the two ends of each magnet exciting coil connect respectively the outfan of sequential control circuit and the outfan of wave generator circuit, by the closure of the each magnet exciting coil of sequential control circuit timesharing control and wave generator circuit, make each magnet exciting coil timesharing produce alternating magnetic field.
The present invention, owing to having adopted above technical scheme, has following advantage and disadvantage:
1, be applied in capsule endoscope AC excitation formula tracking system, for it provides big or small self-adjustable alternating magnetic field, the field signal that magnetic field sensor is detected maintains in a metastable level, has improved the precision of this capsule tracking system.
2, in wave generator circuit, adopted D/A module, microprocessor controls D/A module, can produce all adjustable square waves of amplitude and frequency, then obtain sine wave by filter circuit.By changing the waveforms amplitude of wave generator circuit generation, regulate the magnetic field intensity of generation.
3, by sequential control circuit, ensure each magnet exciting coil and wave generator circuit timesharing closure in magnet exciting coil array, timesharing produces alternating magnetic field, and it is corresponding one by one with each magnet exciting coil to make magnetic field sensor detect the field signal feeding back.
4, in wireless feedback circuit, used original wireless transmitter module and wireless receiving module in capsule endoscope AC excitation formula radio tracking system, without and increase feedback circuit outward, and in this wireless feedback circuit, required components and parts are less, are easy to microminiaturization.
Brief description of the drawings
Fig. 1 is population structure block diagram of the present invention;
Fig. 2 is the structured flowchart of the magnetic generation circuit in the present invention;
Fig. 3 is the sequential control circuit structured flowchart in the present invention;
Fig. 4 is the structured flowchart of the wireless feedback circuit in the present invention.
Detailed description of the invention
Referring to Fig. 1, the adjustable field generator for magnetic under capsule endoscope tracking system of the present invention, is connected with magnetic field sensor module 4 wireless telecommunications that are arranged in capsule, comprises magnetic generation circuit 1, sequential control circuit 2 and wireless feedback circuit 3.The output of sequential control circuit 1 and wireless feedback circuit 3 is connected respectively magnetic generation circuit 2, the timesharing of sequential control circuit controlling magnetic field circuit for generating produces alternating magnetic field, the alternating magnetic field producing is detected by magnetic field sensor module, and process, feed back to magnetic generation circuit by wireless feedback circuit again, change the magnetic field size producing, realize the automatic adjusting of magnetic field intensity.
Referring to Fig. 2, the magnetic generation circuit 2 in the present invention comprises microcontroller 21, wave generator circuit 22 and magnet exciting coil array 23; The output of microcontroller 21 connects wave generator circuit 22, and the output of wave generator circuit 22 connects magnet exciting coil array 23; Microprocessor controls wave generator circuit produces the adjustable sine wave signal of amplitude frequency, and the sine wave signal of generation produces alternating magnetic field through magnet exciting coil array.Wave generator circuit 22 wherein comprises D/A module 221, filter circuit 222 and gain amplifying circuit 223.Microcontroller 21 is connected with D/A module 221 by I/O mouth, makes D/A module outfan produce the adjustable square wave of amplitude frequency; The outfan of D/A module 221 connects the input of filter circuit 222, and filter circuit elimination higher hamonic wave obtains sine wave; The outfan of filter circuit 222 connects gain amplifying circuit 223, obtains required sinusoidal signal.
Referring to Fig. 3, the sequential control circuit 1 in the present invention comprises microcontroller 11 and multiway analog switch 12; Microcontroller 11 is connected with multiway analog switch 12 by I/O mouth, and the output of multiway analog switch 12 connects the magnet exciting coil array 23 in magnetic generation circuit; The break-make of microprocessor controls multiway analog switch, makes each magnet exciting coil timesharing closure in wave generator circuit and magnet exciting coil array, and timesharing produces alternating magnetic field.
Referring to Fig. 4, the wireless feedback circuit 3 in the present invention comprises wireless transmitter module 31 and wireless receiving module 32; Wireless transmitter module 31 is arranged in capsule and is connected with magnetic field sensor module 4, and wireless receiving module 32 is arranged on external and is connected with magnetic generation circuit 2; The field signal that wireless transmitter module detects magnetic field sensor module is wirelessly transmitted to external, wireless receiving module receives described field signal and is fed back to magnetic generation circuit, make magnetic generation circuit change the size of the alternating magnetic field producing, realize the automatic adjusting of magnetic field intensity.
Magnet exciting coil array 23 in the present invention is arranged and is formed by multiple magnet exciting coil orders, magnet exciting coil is formed by copper wire winding, the two ends of each magnet exciting coil connect respectively the outfan of sequential control circuit and the outfan of wave generator circuit, by the closure of the each magnet exciting coil of sequential control circuit timesharing control and wave generator circuit, make each magnet exciting coil timesharing produce alternating magnetic field.
Operation principle of the present invention is, microcontroller 21 in magnetic generation circuit 2 is controlled D/A module 221 and is produced amplitude and the adjustable square wave of frequency, circuit 222 and gain amplifying circuit 223 have just obtained required sine wave after filtering, from Maxwell's Theory of Electromagnetic Field, sinusoidal signal produces alternating magnetic field through magnet exciting coil.Be furnished with multiple magnet exciting coils because external, composition magnet exciting coil array, also needs to connect sequential control circuit, ensures that each coil energy timesharing excitation produces alternating magnetic field.
Magnetic field sensor is placed in capsule endoscope, along with capsule endoscope does unordered random motion in vivo, can not control its movement locus.In the time that capsule endoscope is far away apart from Magnetic Field Source, field signal intensity is large, and the signal that magnetic field sensor receives is strong, and amplifier is easily saturated; In the time that capsule endoscope is nearer apart from Magnetic Field Source, a little less than field signal, the signal that magnetic field sensor receives is very faint, and tracking accuracy error is larger.Therefore, need to increase feedback regulation mechanism, make field generator for magnetic can automatically regulate magnitude of field intensity, improve tracking accuracy.
Magnetic field sensor in body receives external alternating magnetic field, field signal is changed into the signal of telecommunication, realize the electrical measurement of non-electrical signal, then pass through wireless transport module, the characteristic quantity of the field signal extracting is transferred in external microcontroller, and microcontroller, again according to the characteristic quantity size receiving, regulates and controls the D/A chip output amplitude of square wave and the yield value of gain amplifying circuit, regulate with this size of current of inputting magnet exciting coil, realize the automatic regulation function of magnetic field intensity.
Claims (6)
1. the adjustable field generator for magnetic under capsule endoscope tracking system, is connected with the magnetic field sensor module wireless telecommunications that are arranged in capsule, it is characterized in that: comprise magnetic generation circuit, sequential control circuit and wireless feedback circuit; The output of sequential control circuit and wireless feedback circuit is connected respectively magnetic generation circuit, the timesharing of sequential control circuit controlling magnetic field circuit for generating produces alternating magnetic field, the alternating magnetic field producing is detected by magnetic field sensor module, and process, feed back to magnetic generation circuit by wireless feedback circuit again, change the magnetic field size producing, realize the automatic adjusting of magnetic field intensity.
2. the adjustable field generator for magnetic under capsule endoscope tracking system as claimed in claim 1, is characterized in that: described magnetic generation circuit comprises microcontroller, wave generator circuit and magnet exciting coil array; The output of microcontroller connects wave generator circuit, and the output of wave generator circuit connects magnet exciting coil array; Microprocessor controls wave generator circuit produces the adjustable sine wave signal of amplitude frequency, and the sine wave signal of generation produces alternating magnetic field through magnet exciting coil array.
3. the adjustable field generator for magnetic under capsule endoscope tracking system as claimed in claim 1, is characterized in that: described sequential control circuit comprises microcontroller and multiway analog switch; Microcontroller is connected with multiway analog switch by I/O mouth, and the output of multiway analog switch connects the magnet exciting coil array in magnetic generation circuit; The break-make of microprocessor controls multiway analog switch, makes each magnet exciting coil timesharing closure in wave generator circuit and magnet exciting coil array, and timesharing produces alternating magnetic field.
4. the adjustable field generator for magnetic under capsule endoscope tracking system as claimed in claim 1, is characterized in that: described wireless feedback circuit comprises wireless transmitter module and wireless receiving module; Wireless transmitter module is arranged in capsule and is connected with magnetic field sensor module, and wireless receiving module is arranged on external and is connected with magnetic generation circuit; The field signal that wireless transmitter module detects magnetic field sensor module is wirelessly transmitted to external, wireless receiving module receives described field signal and is fed back to magnetic generation circuit, make magnetic generation circuit change the size of the alternating magnetic field producing, realize the automatic adjusting of magnetic field intensity.
5. the adjustable field generator for magnetic under capsule endoscope tracking system as claimed in claim 2, is characterized in that: described wave generator circuit comprises D/A module, filter circuit and gain amplifying circuit; Described microcontroller is connected with D/A module by I/O mouth, makes D/A module outfan produce the adjustable square wave of amplitude frequency; The outfan of D/A module connects the input of filter circuit, and filter circuit elimination higher hamonic wave obtains sine wave; The outfan of filter circuit connects gain amplifying circuit, obtains required sinusoidal signal.
6. the adjustable field generator for magnetic under capsule endoscope tracking system as claimed in claim 2, it is characterized in that: described magnet exciting coil array is arranged and formed by multiple magnet exciting coil orders, magnet exciting coil is formed by copper wire winding, the two ends of each magnet exciting coil connect respectively the outfan of sequential control circuit and the outfan of wave generator circuit, by the closure of the each magnet exciting coil of sequential control circuit timesharing control and wave generator circuit, make each magnet exciting coil timesharing produce alternating magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310152785.XA CN104116481B (en) | 2013-04-27 | 2013-04-27 | Adjustable field generator for magnetic under capsule endoscope tracking system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310152785.XA CN104116481B (en) | 2013-04-27 | 2013-04-27 | Adjustable field generator for magnetic under capsule endoscope tracking system |
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| CN104116481A true CN104116481A (en) | 2014-10-29 |
| CN104116481B CN104116481B (en) | 2016-04-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105261439A (en) * | 2015-10-30 | 2016-01-20 | 黑龙江大学 | Small-sized adjustable constant magnetic field apparatus |
| CN108245251A (en) * | 2017-12-20 | 2018-07-06 | 北京华航无线电测量研究所 | A kind of combination frequency alternating magnetic field generating means |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261439A (en) * | 2015-10-30 | 2016-01-20 | 黑龙江大学 | Small-sized adjustable constant magnetic field apparatus |
| CN108245251A (en) * | 2017-12-20 | 2018-07-06 | 北京华航无线电测量研究所 | A kind of combination frequency alternating magnetic field generating means |
| CN108245251B (en) * | 2017-12-20 | 2019-08-30 | 北京华航无线电测量研究所 | A kind of combination frequency alternating magnetic field generating device |
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| CN104116481B (en) | 2016-04-20 |
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