CN218943336U - Magnetic field positioning circuit of capsule endoscope - Google Patents
Magnetic field positioning circuit of capsule endoscope Download PDFInfo
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- CN218943336U CN218943336U CN202320646368.XU CN202320646368U CN218943336U CN 218943336 U CN218943336 U CN 218943336U CN 202320646368 U CN202320646368 U CN 202320646368U CN 218943336 U CN218943336 U CN 218943336U
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Abstract
The utility model provides a magnetic field positioning circuit of a capsule endoscope, which comprises a magnetic field positioning module, wherein the magnetic field positioning module comprises a magneto-resistance sensor and a voltage stabilizing chip, and the magneto-resistance sensor is an HMC5883L chip; a capacitor C12 is connected between a C1 pin and a GND pin of the magneto-resistance sensor, a capacitor C13 is connected between a SETC pin and a SETP pin of the magneto-resistance sensor, a resistor R3 and a resistor R5 are connected in series between an SDA pin and an SCL pin of the magneto-resistance sensor, a node between the resistor R3 and the resistor R5 is connected with an output end of the voltage stabilizing chip, and a VDD pin, an S1 pin and a VDDIO pin of the magneto-resistance sensor are all connected with an output end of the voltage stabilizing chip; a capacitor C8 and a capacitor C9 are connected in parallel between the output end and the grounding end of the voltage stabilizing chip, and a capacitor C6 is connected in series between the grounding end and the input end of the voltage stabilizing chip. The technical scheme of the application achieves the purpose of improving the positioning accuracy of the capsule.
Description
Technical Field
The utility model belongs to the technical field of endoscopes, and particularly relates to a magnetic field positioning circuit of a capsule endoscope.
Background
Capsule endoscopes are a promising new approach to gastrointestinal tract examination, but current clinical capsule endoscope products still have some problems to be solved, and accurate positioning and tracking are one of the keys. The traditional positioning methods generally adopt methods such as ultrasonic imaging, nuclear medicine imaging and fluorescence modeling positioning, but the positioning methods have the defects of high cost, complex operation, easy radiation to human bodies and incapability of meeting long-time dynamic positioning. Among the various possible positioning methods, positioning techniques using magnets have significant advantages: no power supply, small occupied capsule space, continuous tracking, strong real-time performance and no side effect. The magnetic field positioning circuit is used for acquiring parameters such as magnetic induction intensity and direction, and then the position (three dimensions of X, Y and Z) and the direction (three dimensions of X, Y and Z) of the capsule are obtained according to a positioning and orientation algorithm.
1. The number of the magnetic resistance sensors adopted by the existing magnetic field positioning system is small, and because the intensity of the magnetic field generated by the permanent magnet in the capsule is weak, when the capsule is far away from the magnetic resistance sensors, the error of the acquired magnetic field data is large.
2. Some positioning systems acquire the three-dimensional coordinates of the capsule through a double-shaft magnetic resistance sensor and a single-shaft magnetic resistance sensor, and magnetic field data acquired by different sensors can also cause certain errors.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a magnetic field positioning circuit of a capsule endoscope, which at least partially solves the problems of capsule position information errors in the prior art.
The embodiment of the utility model provides a magnetic field positioning circuit of a capsule endoscope, which comprises a magnetic field positioning module, wherein the magnetic field positioning module comprises a magneto-resistance sensor and a voltage stabilizing chip, and the magneto-resistance sensor is an HMC5883L chip;
a capacitor C12 is connected between a C1 pin and a GND pin of the magneto-resistance sensor, a capacitor C13 is connected between a SETC pin and a SETP pin of the magneto-resistance sensor, a resistor R3 and a resistor R5 are connected in series between an SDA pin and an SCL pin of the magneto-resistance sensor, a node between the resistor R3 and the resistor R5 is connected with an output end of the voltage stabilizing chip, and a VDD pin, an S1 pin and a VDDIO pin of the magneto-resistance sensor are all connected with an output end of the voltage stabilizing chip; a capacitor C8 and a capacitor C9 are connected in parallel between the output end and the grounding end of the voltage stabilizing chip, and a capacitor C6 is connected in series between the grounding end and the input end of the voltage stabilizing chip.
Optionally, the voltage stabilizing chip comprises an SC662K chip.
Optionally, the capacitance value of the capacitor C12 is 4.7uF, and the capacitance value of the capacitor C13 is 0.22 uF.
Optionally, the resistance values of the resistor R3 and the resistor R5 are the same.
Optionally, the resistance values of the resistor R3 and the resistor R5 are both 4.7kΩ.
Optionally, the capacitance value of the capacitor C8 is 10uF, the capacitance value of the capacitor C9 is 0.1uF, and the capacitance value of the capacitor C6 is 4.7uF.
Optionally, 4*4 magnetic field positioning modules are included, and 4*4 magnetic field positioning modules form an array.
Optionally, the 4*4 magnetic field positioning modules are magnetoresistive sensor arrays, the magnetoresistive sensor arrays are uniformly distributed, the distance between the sensors on the X axis is 2-3 cm, and the distance between the sensors on the Y axis is 2-4 cm.
Optionally, an analog switch is also included.
Optionally, the analog switch includes a CD4067BM chip.
The magnetic field positioning circuit of the capsule endoscope provided by the utility model has the advantages that the magnetic resistance sensor adopts the HMC5883L magnetic resistance sensor, the HMC5883L magnetic resistance sensor is a three-axis magnetic resistance sensor, the magnetic field positioning circuit has the advantages of high precision, ultra-low power consumption, low cost and high reliability, the sensor is provided with a set/reset and bias driver for degaussing, self-testing and offset compensation, and the set/reset loop has the function of performing an automatic degaussing function before each data measurement so as to eliminate the offset existing in the equipment, thereby realizing the test of the sensor in a clean magnetic field. Thereby achieving the purpose of improving the positioning accuracy of the capsule.
The 4*4 magnetic field positioning modules adopt a magnetic resistance sensor array, 16 magnetic resistance sensors are arranged, magnetic field data of a plurality of capsules can be acquired, the magnetic field data are sent to the MCU for processing, and the obtained capsule position information has high accuracy.
Drawings
FIG. 1 is an electronic circuit diagram of a magnetic field positioning circuit of a capsule endoscope provided by an embodiment of the utility model;
fig. 2 and 3 are electronic circuit diagrams of a CD4067BM according to an embodiment of the utility model.
Detailed Description
Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
The embodiment discloses a capsule endoscope magnetic field positioning circuit, which comprises a magnetic field positioning module, wherein the magnetic field positioning module comprises a magneto-resistance sensor and a voltage stabilizing chip, and the magneto-resistance sensor is an HMC5883L chip;
a capacitor C12 is connected between a C1 pin and a GND pin of the magneto-resistance sensor, a capacitor C13 is connected between a SETC pin and a SETP pin of the magneto-resistance sensor, a resistor R3 and a resistor R5 are connected in series between an SDA pin and an SCL pin of the magneto-resistance sensor, a node between the resistor R3 and the resistor R5 is connected with an output end of the voltage stabilizing chip, and a VDD pin, an S1 pin and a VDDIO pin of the magneto-resistance sensor are all connected with an output end of the voltage stabilizing chip; a capacitor C8 and a capacitor C9 are connected in parallel between the output end and the grounding end of the voltage stabilizing chip, and a capacitor C6 is connected in series between the grounding end and the input end of the voltage stabilizing chip. The input end of the voltage stabilizing chip is also connected with an external power supply.
Magnetoresistive sensors may use QMC5883L chips, MMC5603 chips, or MMC5983 chips with similar functionality in specific applications.
Optionally, the voltage stabilizing chip comprises an SC662K chip.
The voltage stabilizing chip can adopt ME6209 chip, XC6221 chip or AP2127 chip and other voltage stabilizing chips in specific application.
Optionally, the capacitance value of the capacitor C12 is 4.7uF, and the capacitance value of the capacitor C13 is 0.22 uF.
Optionally, the resistance values of the resistor R3 and the resistor R5 are the same.
Optionally, the resistance values of the resistor R3 and the resistor R5 are both 4.7kΩ.
Optionally, the capacitance value of the capacitor C8 is 10uF, the capacitance value of the capacitor C9 is 0.1uF, and the capacitance value of the capacitor C6 is 4.7uF.
Optionally, 4*4 magnetic field positioning modules are included, and 4*4 magnetic field positioning modules form an array.
Optionally, the 4*4 magnetic field positioning modules are magnetoresistive sensor arrays, the magnetoresistive sensor arrays are uniformly distributed, the distance between the sensors on the X axis is 2-3 cm, and the distance between the sensors on the Y axis is 2-4 cm. The distribution can ensure that the capsule is always in the optimal measurement range of the magnetic resistance sensor when the stomach moves, so that the measurement data precision is higher.
Optionally, an analog switch is also included.
Optionally, the analog switch includes a CD4067BM chip.
As shown in fig. 1 and table 1, the magnetoresistive sensor HMC5883L has a total of 16 pins including 5 NC pins, 2 GND pins, C1 pin, SETC pin, SETP pin, SDA pin, SCL pin, VDD pin, S1 pin, VDDIO pin, and DRDY pin.
The 5 NC pins are not connected; 2 GND pins are grounded; the pin C1 is connected with the pin I of the 4.7uF capacitor C12, and the pin II of the capacitor C12 is grounded; the SETC pin is connected with a first pin of a 0.22uF capacitor C13, the SETP pin is connected with a second pin of the capacitor C13, the SDA pin is connected with a first pin of a 4.7K omega resistor R3, and a second pin of the resistor R3 is connected with the VOUT end of the voltage stabilizing chip; the SCL pin is connected to pin number one of the 4.7K omega resistors R5,
the second pin of the resistor R5 is connected with the VOUT end of the voltage stabilizing chip; the VDD pin, the S1 pin and the VDDIO pin are all connected with the VOUT end of the voltage stabilizing chip.
TABLE 1 HMC5883L chip Pin List
The VOUT pin of the voltage stabilizing chip SC662K outputs stable 3.3V voltage; GND pin is grounded; the VIN pin is connected with a power supply, the 10uF capacitor C8 is connected with the 0.1uF capacitor C9 in parallel, two ends of the 10uF capacitor C8 are respectively connected with the VOUT pin and the GND pin, the first pin of the 4.7uF capacitor C6 is connected with the VIN pin, and the second pin is connected with the GND pin. The VIN pin inputs 3.3V voltage and the VOUT pin outputs 3.3V voltage.
The magneto-resistance sensor HMC5883L and the voltage stabilizing chip SC662K form a magnetic field positioning module; the whole positioning circuit is formed by 4*4 magnetic field positioning modules, as shown in fig. 2 and 3, pins I0-I15 of 2 CD4067BM analog switches are respectively connected with SDA pins and SCL pins of 16 HMCs 5883L; the VSS pin and the INHIBIT pin are grounded; the VCC pin is connected with a power supply; INOUT is connected with a signal port of an external device; the on-state of I0-I15 is controlled by controlling the high and low levels of the ABCD4 pins.
The positioning circuit expresses the intensity of a magnetic field by the differential voltage, a plurality of sensors form 4*4 magnetic field positioning modules, the weak magnetic field generated by the permanent magnet in the capsule can be accurately measured, the voltage stabilizing chip SC662K provides stable 3.3V voltage for the normal operation of the sensors, and the analog switch CD4067BM controls the on-off of SDA and SCL through the high-low level input of 4 pins of the ABCD.
The capsule endoscope magnetic field positioning circuit of the embodiment has the following advantages:
1. the magnetic field positioning module can obtain more accurate magnetic field intensity data in 3 directions (X axis, Y axis and Z axis).
2. The magnetic resistance sensor has low power consumption and low cost.
3. The set/reset loop has the function of automatically demagnetizing before each data measurement to eliminate the offset of the device, so that the sensor can test in a clean magnetic field and the interference of external magnetic field can be reduced.
Claims (10)
1. The magnetic field positioning circuit of the capsule endoscope is characterized by comprising a magnetic field positioning module, wherein the magnetic field positioning module comprises a magneto-resistance sensor and a voltage stabilizing chip, and the magneto-resistance sensor is an HMC5883L chip;
a capacitor C12 is connected between a C1 pin and a GND pin of the magneto-resistance sensor, a capacitor C13 is connected between a SETC pin and a SETP pin of the magneto-resistance sensor, a resistor R3 and a resistor R5 are connected in series between an SDA pin and an SCL pin of the magneto-resistance sensor, a node between the resistor R3 and the resistor R5 is connected with an output end of the voltage stabilizing chip, and a VDD pin, an S1 pin and a VDDIO pin of the magneto-resistance sensor are all connected with an output end of the voltage stabilizing chip; a capacitor C8 and a capacitor C9 are connected in parallel between the output end and the grounding end of the voltage stabilizing chip, and a capacitor C6 is connected in series between the grounding end and the input end of the voltage stabilizing chip.
2. The capsule endoscopic magnetic field localization circuit of claim 1, wherein the voltage stabilizing chip comprises an SC662K chip.
3. The capsule endoscopic magnetic field localization circuit of claim 1, wherein the capacitance value of the capacitance C12 is 4.7uF and the capacitance value of the capacitance C13 is 0.22 uF.
4. The capsule endoscopic magnetic field localization circuit of claim 1, wherein the resistances of the resistor R3 and the resistor R5 are the same.
5. The capsule endoscopic magnetic field localization circuit of claim 4, wherein the resistances of the resistor R3 and the resistor R5 are each 4.7kΩ.
6. The capsule endoscopic magnetic field localization circuit of claim 1, wherein the capacitance value of the capacitor C8 is 10uF, the capacitance value of the capacitor C9 is 0.1uF, and the capacitance value of the capacitor C6 is 4.7uF.
7. The capsule endoscopic magnetic field positioning circuit of claim 1, comprising 4*4 magnetic field positioning modules, 4*4 magnetic field positioning modules forming an array.
8. The capsule endoscopic magnetic field positioning circuit of claim 7, wherein the 4*4 magnetic field positioning modules are magnetoresistive sensor arrays, the magnetoresistive sensor arrays are uniformly distributed, the spacing between the sensors on the X-axis is 2-3 cm, and the spacing between the sensors on the y-axis is 2-4 cm.
9. The capsule endoscopic magnetic field localization circuit of claim 1, further comprising an analog switch.
10. The capsule endoscopic magnetic field localization circuit of claim 9, wherein the analog switch comprises a CD4067BM chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202320646368.XU CN218943336U (en) | 2023-03-29 | 2023-03-29 | Magnetic field positioning circuit of capsule endoscope |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320646368.XU CN218943336U (en) | 2023-03-29 | 2023-03-29 | Magnetic field positioning circuit of capsule endoscope |
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| CN218943336U true CN218943336U (en) | 2023-05-02 |
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