JP2005052363A - Wireless type information inside subject acquisition system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless type information inside a subject acquisition system preventing the saturation of power intensity to be fed via a wireless transmission while avoiding the enlargement of a device introduced into the subject, such as a capsule type endoscope. <P>SOLUTION: The inside of the capsule type endoscope is provided with a receiving resonance circuit 33 for receiving a radio signal, and a voltage converting circuit 26 lowering the voltage of an electric signal obtained by the receiving resonance circuit 33 in receiving. The receiving resonance circuit 33 is provided with a receiving coil 34 and the voltage converting circuit 26 is provided with a power supply coil 36, so that the electric signal with a reduced voltage value is generated in the power supply coil 36 by electromagnetic induction based on a magnetic field formed by the receiving coil 34 in receiving. The saturation of the power intensity is thus prevented by extracting the power using the electric signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wireless subject including an intra-subject introduction device that is introduced into the subject, and a power supply device that is disposed outside the subject and supplies power to the intra-subject introduction device by wireless transmission. The present invention relates to an in-sample information acquisition system.

  In recent years, swallowable capsule endoscopes have appeared in the field of endoscopes. This capsule endoscope is provided with an imaging function and a wireless communication function. Capsule endoscopes are peristaltic in the body cavity, for example, the stomach, small intestine, etc., after being swallowed from the patient's mouth for observation (examination) and before being spontaneously discharged from the human body. It has the function to move according to and to image sequentially.

  While moving in the body cavity, image data captured inside the body by the capsule endoscope is sequentially transmitted to the outside by wireless communication and stored in the memory. When the patient carries the receiver having the wireless communication function and the memory function, the patient can freely act even during the period from swallowing the capsule endoscope until it is discharged. Thereafter, the doctor or nurse can make a diagnosis by displaying an organ image on the display based on the image data stored in the memory.

  Such a capsule endoscope may have a configuration in which driving power is obtained from a built-in power supply source. However, in recent years, a configuration in which driving power is supplied from the outside to the capsule endoscope via wireless transmission has attracted attention. ing. Thus, by adopting a configuration in which electric power is supplied from the outside, it is possible to avoid that the capsule endoscope is unintentionally consumed and stops driving while moving inside the body cavity. It is possible (for example, refer to Patent Document 1).

  FIG. 6 is a circuit diagram showing a configuration of a receiving antenna built in a conventional capsule endoscope for the purpose of receiving wirelessly transmitted power. As shown in FIG. 6, the receiving antenna includes a receiving resonance circuit 103 including a receiving coil 101 and a receiving capacitor 102, a rectifying diode 104 that converts an AC signal into a DC signal, and a rectifying diode 104. And a storage capacitor 105 that stores the rectified power. The reception coil 101 and the reception capacitor 102 are formed so that the reception resonance circuit 103 has a resonance frequency that matches the frequency of the electric signal to be transmitted, and the received electric signal is rectified by the rectification diode 104. Accumulated in the storage capacitor 105. And it has the structure which each component in a capsule endoscope operate | moves using the electric power accumulate | stored in the capacitor | condenser 105 for electrical storage as drive electric power.

Japanese Patent Laying-Open No. 2001-231186 (page 3, FIG. 1)

  However, the conventional wireless in-vivo information acquisition system has a problem that the power value supplied to the capsule endoscope may be saturated as the power transmission intensity increases. Hereinafter, this problem will be described in detail.

  FIG. 7 is a schematic graph showing the waveform of the voltage of the electric signal output from the reception resonance circuit 103 when receiving a high-intensity electric signal transmitted from the outside. In the example of FIG. 7, the waveform of the transmitted electrical signal is a sine wave.

  Since the waveform of the transmitted power is a sine wave, the voltage waveform of the electric signal output from the reception resonance circuit 103 should have a sine waveform. However, in an actual capsule endoscope, when a high-intensity electric signal is received, a waveform in which the voltage value is saturated at a predetermined value is obtained as shown in FIG. In addition, since the current value output from the reception resonance circuit 103 corresponds to the voltage value, when the voltage waveform is saturated, the power value obtained by the product of the voltage and the current is also saturated. Therefore, in the case of a configuration in which power is directly obtained from the electrical signal received by the reception resonance circuit 103, the value of the obtained power cannot be a certain value or more regardless of the strength of the electrical signal transmitted from the outside. . This is disadvantageous in terms of power use efficiency when considering an increase in power consumption associated with higher functionality of an intra-subject introduction apparatus such as a capsule endoscope.

  In order to avoid saturation of the voltage value, it is possible to consider measures such as increasing the size of the coil. However, since the capsule endoscope is introduced into the subject as described above, the size of the capsule endoscope needs to be kept below a certain level, which increases the size of the capsule endoscope. There are various restrictions in enlarging the connected coil.

  The present invention has been made in view of the above, and is a wireless type in which the power intensity supplied by wireless transmission does not saturate while avoiding an increase in the size of an in-subject introduction apparatus such as a capsule endoscope. An object is to realize an in-subject information acquisition system.

  In order to solve the above-described problems and achieve the object, a wireless in-vivo information acquiring system according to claim 1 is disposed outside a subject, an intra-subject introduction device introduced into the subject, A wireless intra-subject information acquisition system including a power feeding device that supplies power to the intra-subject introduction device by wireless transmission, wherein the intra-subject introduction device includes a reception coil and a reception capacitor. A receiving resonance circuit, and voltage conversion means for converting a voltage value of an electric signal received by the receiving resonance circuit into a value lower than an induced electromotive force generated in the receiving coil. And

  According to the first aspect of the present invention, in the intra-subject introduction apparatus, the power of the electric signal received by the receiving resonance circuit is received instead of directly extracting the electric power from the electric signal obtained by the receiving resonance circuit. Since the power is extracted after being converted to a value lower than the induced electromotive force in the coil for use, the voltage value of the power signal extracted as the power can be prevented from being saturated.

  According to a second aspect of the present invention, in the wireless in-vivo information acquisition system, the voltage conversion unit includes a power supply coil that generates an induced electromotive force based on a magnetic field generated at the time of reception by the reception coil. It is characterized by that.

  The wireless in-vivo information acquiring system according to claim 3 is characterized in that, in the above invention, the power supply coil has a smaller number of turns than the number of turns of the reception coil.

  The wireless in-vivo information acquiring system according to claim 4 is characterized in that, in the above invention, the power supply coil is formed such that an inner periphery thereof is in contact with an outer periphery of the reception coil. And

  According to the fourth aspect of the present invention, since the inner circumference of the power supply coil is brought into close contact with the outer circumference of the reception coil, the area occupied by the coil is expanded even though the power supply coil is newly arranged. In other words, the size of the in-subject introduction apparatus can be suppressed.

  According to a fifth aspect of the present invention, there is provided a wireless intra-subject information acquisition system according to the above invention, wherein the intra-subject introduction device introduced into the subject, and the intra-subject introduction device disposed outside the subject, A wireless in-vivo information acquisition system that supplies power to the in-subject introduction device from the transmission / reception device via wireless transmission, the transmission / reception device performing wireless communication between the subject and the subject The internal introduction device includes a receiving resonant circuit having a receiving coil and a receiving capacitor, and a voltage value of an electric signal received by the receiving resonant circuit is lower than an induced electromotive force generated in the receiving coil. And a voltage conversion means for converting into a voltage.

  The wireless in-vivo information acquiring system according to the present invention is an electrical signal received by a receiving resonance circuit, rather than directly extracting electric power from an electrical signal obtained by a receiving resonance circuit in an in-subject introduction apparatus. Is converted to a value lower than the induced electromotive force in the receiving coil, and the power is extracted, so that the voltage value of the power signal extracted as power is prevented from being saturated and supplied from the transmitting / receiving device. There is an effect that it is possible to realize a wireless in-vivo information acquiring system in which the power value is not saturated.

  Further, the wireless in-vivo information acquiring system according to the present invention has a configuration in which the inner periphery of the power supply coil is in close contact with the outer periphery of the reception coil. Thus, there is an effect that the saturation of the power value can be suppressed while suppressing the enlargement of the in-subject introduction apparatus.

  A wireless in-vivo information acquiring system that is the best mode for carrying out the present invention will be described below. Note that the drawings are schematic, and it should be noted that the relationship between the thickness and width of each part, the ratio of the thickness of each part, and the like are different from the actual ones. Of course, the part from which the relationship and ratio of a mutual dimension differ is contained. In the following embodiments, an example of a capsule endoscope system that captures an image in a body cavity will be described as an example. However, information in a subject is not limited to an image in a body cavity. Of course, the information acquisition system is not limited to the capsule endoscope system.

  FIG. 1 is a schematic diagram showing an overall configuration of a wireless in-vivo information acquiring system according to the present embodiment. As shown in FIG. 1, the wireless in-vivo information acquisition system includes a transmission / reception device 2 having a wireless transmission / reception function, and driving power obtained from a wireless signal introduced into the body of the subject 1 and transmitted from the transmission / reception device 2. And a capsule endoscope 3 that takes an image of a body cavity and transmits data to the transmission / reception device 2. In addition, the wireless in-vivo information acquiring system is configured to display data in the body cavity based on data received by the transmission / reception device 2 and to exchange data between the transmission / reception device 2 and the display device 4. A portable recording medium 5. The transmission / reception device 2 includes a transmission / reception jacket 2a worn by the subject 1 and an external device 2b that performs processing of radio signals transmitted / received via the transmission / reception jacket 2a.

  The display device 4 is for displaying an in-vivo image captured by the capsule endoscope 3, and has a configuration such as a workstation that displays an image based on data obtained by the portable recording medium 5. Have Specifically, the display device 4 may be configured to directly display an image by a CRT display, a liquid crystal display, or the like, or may be configured to output an image to another medium such as a printer.

  The portable recording medium 5 can be attached to and detached from the external device 2b and the display device 4, and has a structure capable of outputting or recording information when being inserted into both. Specifically, the portable recording medium 5 is inserted into the external device 2 b and transmitted from the capsule endoscope 3 while the capsule endoscope 3 is moving in the body cavity of the subject 1. Record the data. Then, after the capsule endoscope 3 is ejected from the subject 1, that is, after imaging of the inside of the subject 1 is finished, the capsule endoscope 3 is taken out from the external device 2b and inserted into the display device 4 to be attached to the display device. 4 is read out. When data is transferred between the external device 2b and the display device 4 by a portable recording medium 5 such as a compact flash (registered trademark) memory, and the external device 2b and the display device 4 are connected by wire. Unlike the above, the subject 1 can freely move during imaging in the body cavity.

  The transmission / reception device 2 has a function as a power supply device that transmits power to the capsule endoscope 3 and also functions as a reception device that receives in-vivo image data transmitted from the capsule endoscope 3. Have. FIG. 2 is a block diagram schematically showing the configuration of the transmission / reception device 2. As shown in FIG. 2, the transmission / reception apparatus 2 has a shape that can be worn by the subject 1, and includes a transmission / reception jacket 2a including reception antennas A1 to An and feeding antennas B1 to Bm, and radio signals transmitted and received. And an external device 2b for performing the above processing.

  The external device 2b has a function of processing a radio signal transmitted from the capsule endoscope 3. Specifically, as shown in FIG. 2, the external device 2b performs predetermined processing on the radio signals received by the receiving antennas A1 to An, and the capsule endoscope 3 out of the radio signals. An RF receiving unit 11 that extracts and outputs the acquired image data, an image processing unit 12 that performs necessary processing on the output image data, and a storage unit 13 that records the image data subjected to image processing. With. Note that image data is recorded on the portable recording medium 5 via the storage unit 13.

  The external device 2b has a function of generating a radio signal to be transmitted to the capsule endoscope 3. Specifically, the external device 2 b includes an oscillator 14 that generates a power feeding signal and defines an oscillation frequency, and a control information input unit that generates a control information signal for controlling the driving state of the capsule endoscope 3. 15, a superimposing circuit 16 that combines the power feeding signal and the control information signal, and an amplifier circuit 17 that amplifies the intensity of the combined signal. The signal amplified by the amplifier circuit 17 is sent to the power feeding antennas B <b> 1 to Bm and is sent to the capsule endoscope 3. The external device 2b includes a power supply unit 18 including a predetermined power storage device or an AC power adapter, and the constituent elements of the external device 2b use the power supplied from the power supply unit 18 as driving energy.

  Next, the capsule endoscope 3 will be described. FIG. 3 is a block diagram schematically showing the configuration of the capsule endoscope 3. As shown in FIG. 3, the capsule endoscope 3 includes an LED 19 for irradiating an imaging region when photographing the inside of the subject 1, an LED driving circuit 20 for controlling the driving state of the LED 19, and the LED 19. And a CCD 21 for imaging the irradiated region. The capsule endoscope 3 includes a CCD driving circuit 22 that controls the driving state of the CCD 21, an RF transmission unit 23 that modulates image data captured by the CCD 21 and generates an RF signal, and an RF transmission unit 23. A transmission antenna unit 24 that transmits the output RF signal, and a system control circuit 32 that controls operations of the LED drive circuit 20, the CCD drive circuit 22, and the RF transmission unit 23 are provided.

  By providing these mechanisms, the capsule endoscope 3 acquires image information of the region to be examined illuminated by the LED 19 by the CCD 21 while being introduced into the subject 1. The acquired image information is converted into an RF signal in the RF transmission unit 23 and then transmitted to the outside via the transmission antenna unit 24.

  The capsule endoscope 3 includes a receiving antenna unit 25 that receives a radio signal transmitted from the transmission / reception device 2, a voltage conversion circuit 26 that performs voltage conversion on a signal received by the receiving antenna unit 25, And a separation circuit 27 that separates the power feeding signal from the signal whose voltage value has been converted. Furthermore, the capsule endoscope 3 includes a power regeneration circuit 28 that regenerates power from the separated power supply signal, a booster circuit 29 that boosts the regenerated power, and a capacitor 30 that stores the boosted power. Prepare. Further, the capsule endoscope 3 detects the content of the control information signal from the component separated from the power feeding signal by the separation circuit 27, and if necessary, the LED drive circuit 20, the CCD drive circuit 22, and the system control circuit 32. Is provided with a control information detection circuit 31 for outputting a control signal.

  By providing these mechanisms, the capsule endoscope 3 first receives the radio signal transmitted from the transmission / reception device 2 at the receiving antenna unit 25 and performs voltage conversion by the voltage conversion circuit 26, and then the separation circuit. 27 separates the power supply signal and the control information signal from the radio signal. The control information signal is output to the LED drive circuit 20, the CCD drive circuit 22 and the system control circuit 32 through the control information detection circuit 31, and is used for controlling the drive state of the LED 19, the CCD 21 and the RF transmission unit 23. On the other hand, the power feeding signal is regenerated as power by the power regeneration circuit 28, and the regenerated power is boosted to the potential of the capacitor 30 by the booster circuit 29 and then stored in the capacitor 30. The battery 30 supplies power to the system control circuit 32 and other components. Thus, the capsule endoscope 3 has a configuration in which power is supplied by wireless transmission from the transmission / reception device 2.

  Next, the configuration of the receiving antenna unit 25 and the voltage conversion circuit 26 among the components of the capsule endoscope 3 will be described. FIG. 4 is a circuit diagram showing the relationship between the reception resonance circuit 33 constituting the reception antenna unit 25 and the voltage conversion circuit 26. As shown in FIG. 4, the reception resonance circuit 33 includes a reception coil 34 and a reception capacitor 35. The reception resonance circuit 33 has a resonance frequency determined based on the self-inductance value of the reception coil 34 and the capacitance value of the reception capacitor 35, and the resonance frequency is substantially equal to the frequency of the oscillator 14 provided in the transmission / reception device 2. The shapes of the receiving coil 34 and the receiving capacitor 35 are determined so as to be equal to each other.

  On the other hand, the voltage conversion circuit 26 includes a power supply coil 36 disposed in the vicinity of the reception coil 34, and an induced electromotive force is generated in the power supply coil 36 based on a magnetic field generated in the reception coil 34 when a radio signal is received. It has the structure which occurs. Here, the power supply coil 36 has a structure having a smaller number of turns than the number of turns of the reception coil 34 based on the reason described later.

  Specific configurations of the reception coil 34 and the power supply coil 36 will be described. FIG. 5 is a schematic diagram showing a specific configuration of the reception coil 34 and the power supply coil 36. As shown in FIG. 5, the power supply coil 36 is in contact with the outer periphery of the reception coil 34 at least at the inner periphery thereof, and more preferably in close contact with the reception coil 34 having the same structure as the conventional one. It has a structure wound like this. Here, the reception coil 34 and the power supply coil 36 are constituted by, for example, an insulation-coated copper wire or the like, and have a structure that is electrically insulated from each other. By having such a positional relationship, most of the magnetic field generated in the reception coil 34 passes through the power supply coil 36.

  Next, the operation of the voltage conversion circuit 26 will be described. First, the reception resonance circuit 33 has a resonance frequency substantially equal to the frequency of the radio signal transmitted from the transmission / reception device 2, thereby resonating with the radio signal at the time of reception, and a current flows in the circuit. A magnetic field corresponding to a radio signal is generated in the receiving coil 34 as indicated by an arrow in FIG. 4 in response to a change in the current flowing in the receiving resonance circuit 33 during reception.

  The magnetic field generated by the reception coil 34 reaches a power supply coil 36 provided in the vicinity of the reception coil 34, and the power supply coil 36 generates an induced electromotive force based on a change in the strength of the magnetic field. Here, due to the magnitude of the number of turns of the coil, the induced electromotive force generated in the power supply coil 36 is smaller than the value of the voltage generated in the reception coil 34. A predetermined current flows through the power supply coil 36 in response to the induced electromotive force, and the electric power is regenerated based on the current and the induced electromotive force, and the regenerated electric power is stored in the battery 30. The capsule endoscope 3 operates using the electric power stored in the battery 30 to perform a predetermined function such as imaging.

  Next, advantages of the wireless in-vivo information acquiring system according to the present embodiment will be described. First, the wireless in-vivo information acquiring system according to the present embodiment has an advantage that high-intensity power can be supplied via wireless transmission by including the voltage conversion circuit 26.

  As already described, since the capsule endoscope 3 has a configuration in which the capsule endoscope 3 is swallowed by the subject 1 and moves inside the subject 1, it is necessary to reduce the size in order to reduce the load applied to the subject 1. In addition, the receiving coil 34 that constitutes the receiving antenna unit 25 must also have a small shape. Therefore, when the current is directly extracted from the reception resonance circuit 33, the output voltage value is saturated as the intensity of the transmitted power increases, and a part of the transmitted radio signal can be extracted as the power. There was no possibility.

  Therefore, in the present embodiment, the capsule endoscope 3 is generated in the reception resonance circuit 33 separately from the reception antenna unit 25 including the reception resonance circuit 33 for resonating with the transmitted radio signal. The voltage conversion circuit 26 that reduces the voltage value of the electric signal is provided. When the voltage value of the electrical signal received by the voltage conversion circuit 26 is converted and then output to the separation circuit 27 or the like, the voltage value is more saturated than when the power is directly extracted from the reception resonance circuit 33. It has been confirmed by the inventors that it is unlikely to occur. It is not always clear at this time what kind of mechanism is used to avoid the occurrence of voltage saturation, but it is probably due to the configuration in which power is extracted from the voltage conversion circuit 26 having a circuit configuration different from that of the resonance circuit.

  From the above, the wireless in-vivo information acquiring system according to the present embodiment is saturated with the strength of the extracted power by using the voltage conversion circuit 26 regardless of the strength of the transmitted radio signal. It has the advantage that generation | occurrence | production can be suppressed. That is, in the present embodiment, the capsule endoscope 3 can obtain driving power corresponding to the intensity of the wireless signal transmitted from the transmission / reception device 2, and the wireless intra-subject information according to the present embodiment. The acquisition system can supply high-intensity power via wireless transmission.

  In addition, the wireless in-vivo information acquiring system according to the present embodiment has an advantage that it is possible to suppress a decrease in power value due to voltage conversion by providing the power supply coil 36 as shown in FIG. As shown in FIG. 5, the power supply coil 36 is configured such that the inner periphery thereof is disposed on the outer periphery of the reception coil 34, and the magnetic field formed by the reception coil 34 during reception of the radio signal is It passes through the power supply coil 36 without leaking. For this reason, the magnetic field generated by the receiving coil 34 can be used without leakage for electromagnetic induction in the power supply coil 36, and voltage conversion can be performed while suppressing a decrease in power.

  Furthermore, since the power supply coil 36 has the structure shown in FIG. 5, there is an advantage that highly efficient power transmission can be performed without increasing the size of the capsule endoscope 3. In other words, the receiving coil 34 and the power supply coil 36 are not arranged separately and independently, but are arranged so that the inner periphery of the power supply coil 36 is positioned on the outer periphery of the receiving coil 34. The configuration is such that most of the inside of the coil is shared. For this reason, although the power supply coil 36 is newly provided to improve the power utilization efficiency, the occupied area of the coil portion does not increase inside the capsule endoscope 3, It is possible to realize the capsule endoscope 3 having the same size as the conventional one. Note that all or part of the components of the capsule endoscope 3 such as the LED 19 and the CCD 21 may be arranged in the internal space of the receiving coil 34 having the structure shown in FIG. The capsule endoscope 3 can be further downsized.

  Although the present invention has been described above by the embodiments, the present invention is not limited to the above, and those skilled in the art can conceive various examples, modifications, and application examples. For example, in the present embodiment, the capsule endoscope is configured to capture an image inside the subject 1 by including an LED, a CCD, and the like. However, the intra-subject introduction apparatus to be introduced into the subject is not limited to such a configuration, and other in-subject information such as temperature information and pH information may be acquired. In addition, as a configuration in which the in-subject introduction apparatus includes a vibrator, an ultrasonic image in the subject 1 may be acquired. Furthermore, it is good also as a structure which acquires several information from these in-subject information.

  Further, the radio signal transmitted from the transmission / reception device to the capsule endoscope includes the power feeding signal and the control information signal, but may include only the power feeding signal. A signal may be included. That is, the present invention can be applied to any configuration that wirelessly transmits a power feeding signal converted into electric power from the transmitting / receiving device to the capsule endoscope 3.

  Further, in the present embodiment, the transmission / reception device 2 includes the transmission / reception jacket 2a, and the transmission / reception jacket 2a includes the reception antennas A1 to An and the power supply antennas B1 to Bm. A configuration may be employed in which the antenna is disposed at another location. Furthermore, instead of performing data transfer between the transmission / reception device 2 and the display device 4 using the portable recording medium 5, the transmission / reception device 2 and the display device 4 may be connected by wire or wireless.

  Further, the structure of the voltage conversion circuit 26 is not necessarily limited to that shown in FIGS. The configurations shown in FIGS. 4 and 5 are shown as an example of suppressing the power reduction and suppressing the enlargement of the capsule endoscope 3, and the voltage conversion circuit has a voltage conversion function. Other structures may be used.

It is a schematic diagram which shows the whole structure of the radio | wireless type in-vivo information acquisition system concerning embodiment. It is a block diagram which shows typically the structure of the transmission / reception apparatus which comprises a radio | wireless type in-vivo information acquisition system. It is a block diagram which shows typically the structure of the capsule endoscope which comprises the wireless type in-vivo information acquisition system. It is a circuit diagram which shows the relationship between the resonance circuit for reception which comprises a capsule type | mold endoscope, and a voltage conversion circuit. It is a figure which shows the specific positional relationship of the coil for reception which comprises the resonance circuit for reception, and the coil for electric power supply which comprises a voltage conversion circuit. FIG. 6 is a circuit diagram schematically illustrating a configuration in which a capsule endoscope according to a conventional technique receives a wireless signal transmitted from the outside and extracts power. 6 is a schematic graph showing a voltage waveform of a received power signal in a capsule endoscope according to a conventional technique.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Subject 2 Transmission / reception apparatus 2a Transmission / reception jacket 2b External apparatus 3 Capsule endoscope 4 Display apparatus 5 Portable recording medium 6 Coil for power supply 11 RF receiving unit 12 Image processing unit 13 Storage unit 14 Oscillator 15 Control information input unit 16 Superimposing circuit 17 Amplifying circuit 18 Power supply unit 19 LED
20 LED drive circuit 21 CCD
DESCRIPTION OF SYMBOLS 22 CCD drive circuit 23 RF transmission unit 24 Transmission antenna part 25 Reception antenna part 26 Voltage conversion circuit 27 Separation circuit 28 Power regeneration circuit 29 Booster circuit 30 Capacitor 31 Control information detection circuit 32 System control circuit 33 Resonance resonance circuit 34 Reception coil 35 Receiving capacitor 36 Power supply coil

Claims (5)

Wireless intra-subject information acquisition comprising an intra-subject introduction device introduced into the subject and a power supply device arranged outside the subject and supplying power to the intra-subject introduction device by wireless transmission A system,
The in-subject introduction device comprises:
A receiving resonance circuit having a receiving coil and a receiving capacitor;
Voltage conversion means for converting the voltage value of the electrical signal received by the reception resonance circuit to a value lower than the induced electromotive force generated in the reception coil;
A wireless in-vivo information acquiring system comprising:   2. The wireless in-vivo information acquiring system according to claim 1, wherein the voltage conversion unit includes a power supply coil that generates an induced electromotive force based on a magnetic field generated at the time of reception by the reception coil.   The wireless in-vivo information acquiring system according to claim 2, wherein the power supply coil has a smaller number of turns than the number of turns of the reception coil.   4. The wireless in-vivo information acquiring system according to claim 2, wherein the power supply coil is formed such that an inner periphery thereof is in contact with an outer periphery of the reception coil. 5. The in-subject introduction device comprises:
Separating means for separating a power feeding signal from an electrical signal whose voltage value has been converted by the voltage converting means;
Power regeneration means for regenerating power based on the separated power supply signal;
Power storage means for storing the regenerated power;
The wireless in-vivo information acquiring system according to any one of claims 1 to 4, further comprising:

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