JP2007301160A - Apparatus and method for supplying electric energy into living body, energy transmission apparatus and energy receiving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly efficiently supply electric energy into a living body. <P>SOLUTION: A transmission device ultrasonic transducer disposed outside the living body converts the electric energy into an ultrasonic energy to oscillate intense ultrasonic waves, while a receiving device ultrasonic sensor in the living body receives the intense ultrasonic waves, converts the ultrasonic energy into the electric energy to supply power to an application apparatus. When increasing the electric energy ultrasonically transmitted, a plurality of ultrasonic transducers and ultrasonic sensors are employed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes an energy transmission device that transmits energy from outside the living body, and an energy reception device that receives the energy transmitted from the energy transmission device in the living body and supplies electrical energy to the in-vivo device. In-vivo electric energy supply apparatus, in-vivo electric energy supply method, energy transmission apparatus, and energy reception apparatus, and more particularly, in-vivo electric energy supply apparatus and in-vivo electric energy supply method capable of efficiently supplying electric energy into a living body The present invention relates to an energy transmission device and an energy reception device.

  In recent years, in order to relieve pain of the examinee in endoscopy, a capsule tablet type endoscope has been developed in place of the tube type endoscope that has been used so far. Such a capsule endoscope is equipped with a camera, illumination, wireless communication equipment, and the like, and has a function of taking images of the inside of the human body such as the stomach and small intestine and transmitting them to the outside. In the future, equipment equipped with functions capable of performing advanced examinations and treatments such as ultrasonic echoes, self-propelled mechanisms, and drug administration is planned (for example, see Non-Patent Document 1).

  By the way, what becomes a problem in such a capsule endoscope is the securing of the driving power source. In capsule endoscopes developed so far, a silver oxide battery has been incorporated as a drive power source.

  When a silver oxide battery is used as a driving power source, the problem of running out of the battery cannot be avoided. That is, it is conceivable that a capsule endoscope that takes 5 to 8 hours to pass through the body does not fulfill its role because the battery is consumed during operation (see Non-Patent Document 1, for example). ).

  In particular, if the capsule endoscope rides on the projections in the stomach or intestine and does not move forward, the battery will be depleted before the capsule endoscope reaches the diagnosis site, and a battery will be built in. There is a risk that the capsule endoscope may be left in the body and the dissolved battery components may adversely affect the human body. In addition, new functions planned for the future such as ultrasonic echoes and self-propelled mechanisms involve more power consumption than ever, and the consumption of the built-in silver oxide battery is expected to become severe.

  In order to solve such a problem of power shortage, a method of supplying power by electromagnetic coupling has been proposed as a method for supplying power from outside the body (for example, see Non-Patent Documents 1 to 4). In this method, a coil is provided inside a capsule endoscope, and the coil is disposed around the human body, so that electric power is supplied by electromagnetic coupling from an external coil. Such a system is going to be used in the capsule endoscope inside the body and wireless communication outside the body.

“Development of capsule endoscope and peripheral technology aiming at expansion and evolution of endoscope”, [Search April 7, 2006], Internet <URL: http://www.olympus.co.jp/jp/ news / 2004b / nr041130capslj.cfm> “Wireless power transmission” [Search April 7, 2006], Internet <URL: http://www.rfnorika.com/system/system_003.html> Inagaki, Aoki, Koshiji, “Transcutaneous energy transmission system for capsule-type in-vivo cameras-Examination of miniaturization of transcutaneous transformer and improvement of energy transmission characteristics”, 3rd Japan Society for Life Support Engineering Association (2005.12. Mie) p. 49 Morimasa, Nagato, Shiba, Kaoru, "Energy transmission system for capsule endoscopes-Examination on improvement of transmission capability", 3rd Japan Society for Life Support Engineering Association (2005. 12. Mie) p. 50

However, transmitting electric power by the electromagnetic field coupling method can only expect an output within the range of laws and regulations that regulate the influence of radio waves on the living body. For example, the allowable value of the electromagnetic field intensity in Japan at 13.56 MHz is 500 μV / m, the maximum is 1 mW / cm ² or less in terms of power density, sufficient power supply cannot be expected, and attenuation in the body is also large (for example, (See "Development of in-vivo wireless communication system", [Search April 7, 2006], Internet <URL: masu-www.pi.titech.ac.jp/poster/200310/200310_invivo.pdf>).

Although power transmission by magnetic field coupling of about 100 kHz to 200 kHz has also been proposed, it is still subject to legal restrictions on electromagnetic field strength, and power transmission efficiency is lowered depending on the positional relationship between the transmission coils. In addition, a method of transmitting power and information into a living body using a microwave with a frequency of 2.45 GHz or the like has been proposed. In addition to laws and regulations that can transmit only power of 1 mW / cm ² or less at maximum in power density, Microwaves have a large attenuation in the body of 60 to 90 dB, and there are many problems to realize (for example, “development of in-vivo wireless communication system”, [search April 7, 2006], Internet <URL: masu -See www.pi.titech.ac.jp/poster/200310/200310_invivo.pdf>.

  The present invention has been made to solve the above-described problems caused by the prior art, and provides an in-vivo electric energy supply apparatus, in-vivo electric energy supply method, and energy that can efficiently supply electric energy into the living body. An object is to provide a transmission device and an energy reception device.

  In order to solve the above-described problems and achieve the object, an in-vivo electrical energy supply device according to the invention of claim 1 includes an energy transmission device that transmits energy from the outside of the living body and energy transmitted from the energy transmission device. An in-vivo electric energy supply device configured to receive an in-vivo energy and supply electric energy to the in-vivo device, wherein the energy transmission device transmits ultrasonic waves. The energy receiving apparatus includes ultrasonic receiving means for receiving the ultrasonic wave oscillated by the ultrasonic oscillating means and converting it into electric energy.

  According to the first aspect of the present invention, the energy transmission device transmits ultrasonic waves, and the energy reception device receives ultrasonic waves generated by the energy oscillation device and converts them into electric energy. It can be used to transmit energy and convert it into electrical energy in vivo.

  The in-vivo electrical energy supply device according to a second aspect of the present invention is the in-vivo electrical energy supply device according to the first aspect, wherein the energy transmission device further comprises a frequency conversion means for generating a pulse of a predetermined frequency from an AC power source. The sound wave oscillating means resonates with a pulse having a predetermined frequency generated by the frequency converting means and oscillates an ultrasonic wave.

  According to the second aspect of the present invention, the energy transmission device is configured to generate a pulse having a predetermined frequency from the AC power source, and oscillate an ultrasonic wave by resonating with the generated pulse having the predetermined frequency. Can be used to oscillate ultrasonic waves.

  According to a third aspect of the present invention, there is provided the in-vivo electrical energy supply device according to the second aspect, wherein the energy transmission device further includes a boosting unit that boosts a pulse having a predetermined frequency generated by the frequency conversion unit. And the ultrasonic wave oscillating means resonates with the pulse boosted by the pressure boosting means and oscillates an ultrasonic wave.

  According to the third aspect of the invention, the energy transmission device boosts the generated pulse of the predetermined frequency and oscillates the ultrasonic wave by resonating with the boosted pulse. be able to.

  According to a fourth aspect of the present invention, there is provided the in-vivo electrical energy supply device according to the first, second, or third aspect, wherein the ultrasonic wave oscillation means comprises a plurality of ultrasonic transducers.

  According to the fourth aspect of the present invention, since ultrasonic waves are oscillated from a plurality of ultrasonic transducers, energy can be transmitted even when the position of the energy receiving device is slightly moved.

  An in-vivo electrical energy supply device according to a fifth aspect of the invention is the invention according to any one of the first to fourth aspects, wherein the ultrasonic wave receiving means is an ultrasonic wave oscillated by the ultrasonic wave oscillating means. The energy receiving device further includes a rectifying unit that rectifies the alternating current converted from the ultrasonic wave by the ultrasonic wave receiving unit into a direct current.

  According to the fifth aspect of the present invention, the energy receiving device is configured to receive the ultrasonic wave oscillated by the energy transmitting device, convert it to alternating current, and rectify the converted alternating current to direct current. Can be supplied.

  The in-vivo electrical energy supply apparatus according to the invention of claim 6 is the invention of claim 5, wherein the energy receiving apparatus further comprises matching means for matching impedance with a reactance load of the ultrasonic receiving means. It is characterized by that.

  According to the sixth aspect of the present invention, the energy receiving apparatus is configured to perform impedance matching with the reactance load when receiving the ultrasonic wave and converting it into electric energy, and thus can efficiently extract electric power.

  According to a seventh aspect of the present invention, there is provided an in-vivo electrical energy supply device according to the fourth aspect of the present invention, wherein the in-vivo electrical energy supply device is arranged corresponding to the plurality of ultrasonic transducers and wirelessly transmits and receives identifiers for identifying the device itself. A plurality of in vitro wireless communication devices, further comprising: an in vitro wireless communication device; and an in vivo wireless communication device that receives and returns an identifier transmitted from the in vitro wireless communication device in vivo together with the energy receiving device. Of the devices, only the ultrasonic transducer corresponding to the in vitro wireless communication device that has received the identifier returned by the in vivo wireless communication device oscillates ultrasonic waves.

  According to the seventh aspect of the present invention, a plurality of in vitro wireless communication devices that wirelessly transmit and receive an identifier for identifying the device itself are arranged corresponding to the plurality of ultrasonic transducers, and in vivo together with the energy receiving device, The in-vivo wireless communication device receives and returns the identifier transmitted from the in-vivo wireless communication device, and receives the identifier returned by the in-vivo wireless communication device among the plurality of in-vitro wireless communication devices. Since only the corresponding ultrasonic transducer is configured to oscillate ultrasonic waves, only the ultrasonic transducer corresponding to the position of the energy receiving device can be oscillated.

  An in-vivo electric energy supply method according to the invention of claim 8 is an in-vivo electric energy supply method for transmitting energy from the outside of a living body to supply electric energy to an in-vivo device. An ultrasonic oscillation process for oscillating ultrasonic waves, and an ultrasonic reception process for receiving the ultrasonic waves oscillated in the ultrasonic oscillation process in vivo and converting them into electrical energy are included.

  According to the eighth aspect of the present invention, the ultrasonic wave is oscillated from outside the living body, and the ultrasonic wave is received in the living body and converted into electric energy. It can be converted into electrical energy in the body.

  An energy transmission device according to a ninth aspect of the invention is an energy transmission device that receives transmitted energy in a living body and transmits the energy to an energy receiving device that supplies electric energy to the in-vivo device. And an ultrasonic oscillator that transmits energy by transmitting ultrasonic waves that are received in vivo by the energy receiving device and converted into electrical energy.

  According to the ninth aspect of the present invention, since energy is transmitted by transmitting an ultrasonic wave received in vivo by the energy receiving device and converted into electric energy, the energy is transmitted using the ultrasonic wave. Can be converted into electrical energy in vivo.

  An energy receiving apparatus according to claim 10 is an energy receiving apparatus that receives energy in vivo from an energy transmitting apparatus that transmits energy from outside the living body and supplies electric energy to the in-vivo apparatus. And an ultrasonic receiving means for receiving the ultrasonic wave oscillated by the energy transmitting device and converting it into electric energy.

  According to the invention of claim 10, since the ultrasonic wave oscillated by the energy transmitting device is received and converted into electric energy, the ultrasonic wave is used to transmit energy and convert it into electric energy in the living body. can do.

  According to the first, eighth, ninth and tenth aspects of the present invention, since energy is transmitted using ultrasonic waves and converted into electric energy in the living body, the electric energy can be efficiently supplied into the living body. Play.

  According to the invention of claim 2, since the ultrasonic wave is oscillated using the electric energy, the electric energy can be converted into the ultrasonic energy and transmitted.

  Further, according to the invention of claim 3, since powerful ultrasonic waves are oscillated, there is an effect that the energy to be transmitted can be increased.

  According to the fourth aspect of the present invention, energy can be transmitted even when the position of the energy receiving device is slightly moved, so that it is possible to transmit energy stably.

  Further, according to the invention of claim 5, since direct current electric energy can be supplied, there is an effect that the device of the direct current power source can be used in the living body.

  Further, according to the invention of claim 6, since the electric power is taken out efficiently, there is an effect that the energy can be transmitted efficiently.

  According to the invention of claim 7, since only the ultrasonic transducer corresponding to the position of the energy receiving device is oscillated, there is an effect that energy can be transmitted efficiently.

  Exemplary embodiments of an in-vivo electric energy supply apparatus, an in-vivo electric energy supply method, an energy transmission apparatus, and an energy reception apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a functional block diagram illustrating the configuration of the in-vivo electrical energy supply apparatus according to the present embodiment. The in-vivo electrical energy supply apparatus includes an ultrasonic transmission device 10 and a reception device 20.

  The ultrasonic transmission device 10 includes an ultrasonic transducer 14 for converting electrical energy into ultrasonic energy, a frequency converter 12, and a power amplifier 13. The ultrasonic receiving device 20 includes an ultrasonic sensor 21 for converting ultrasonic energy into electric energy, a rectifier circuit 22, a matching circuit 23, and a storage circuit 24.

  A pulse with a frequency of 25 kHz is generated by the frequency converter 12 from electrical energy obtained from a commercial power source such as 100V. The obtained frequency pulse is boosted to a desired applied voltage such as 50 V by the power amplifier 13. The boosted frequency pulse is applied to the ultrasonic transducer 14 having the same resonance frequency and oscillates the ultrasonic transducer 14. High-power ultrasonic waves 15 are oscillated from the ultrasonic transducer 14 and transmitted to an application device 30 such as a pacemaker installed in the living body 9.

  The receiving device 20 connected to the application device 30 installed in the body of a pacemaker or the like is provided with an ultrasonic sensor 21. The ultrasonic sensor 21 receives the transmitted ultrasonic waves and converts them into alternating current. The converted alternating current is converted into direct current by the rectifier circuit 22. Here, since there is a reactance load in the ultrasonic sensor 21, a matching circuit 23 is inserted in order to achieve impedance matching, and power is efficiently extracted. The transmitted direct current is stored in the storage circuit 24, so that the application device 30 can be driven stably.

  In this embodiment, an example of oscillating an ultrasonic pulse having a frequency of 25 kHz is shown, but the implementation frequency is not limited to this, and may be another frequency. In addition, although an ultrasonic transducer such as an open type or a droplet ejection type is used as the transmission transducer, a Langevin type transducer or the like may also be used.

  The reception ultrasonic sensor may not be an open type or a drop type ultrasonic sensor as long as it can receive ultrasonic waves of a desired frequency and convert them into alternating current. The matching circuit may not be inserted as long as the impedance of the ultrasonic sensor and the application device is matched. In short, what is necessary is that transmission from the transmitting device to the receiving device can be performed with less attenuation on the way.

  In the present embodiment, the case where one ultrasonic transducer and one ultrasonic sensor are used is described. However, in order to increase the amount of electric power to be transmitted, a plurality of ultrasonic transducers and ultrasonic sensors can be used. .

  FIG. 2 is a diagram illustrating a transmission device including a plurality of ultrasonic transducers. In the transmission device shown in FIG. 2A, nine ultrasonic transducers 31 are arranged in a lattice pattern instead of one ultrasonic transducer. By increasing the ultrasonic irradiation area, electric energy can be stably transmitted even when the position of the receiving device in the living body moves back and forth and right and left.

  The transmission device shown in FIG. 2 (b) has four ultrasonic transducers 32 arranged on the four surfaces of the box instead of one ultrasonic transducer. By putting the living body in this box, the living body is irradiated with ultrasonic waves from the front, rear, left and right. Due to the increase in the direction of ultrasonic irradiation, electric energy can be efficiently transmitted regardless of the direction of the receiving device in the living body. In addition, since two of the four transducers oppose each other, the ultrasonic waves cause a buffering action in the living body, and large ultrasonic energy can be transmitted.

  In FIG. 2C, nine ultrasonic transducer sets 33 arranged in a lattice are arranged on four sides of the box. By placing the living body in this box, the living body is irradiated with ultrasonic waves with a wide irradiation area from front, rear, left and right. As a result, electric energy can be stably transmitted regardless of the position and the direction of the receiving device in the living body.

  Here, nine ultrasonic transducers are arranged in a grid pattern, but the number of ultrasonic transducers is not limited to this, and other numbers may be used, and the arrangement may not be a grid pattern. Absent. Further, the arrangement of the box on the four surfaces may be other shapes such as octagonal surfaces instead of the box.

  FIG. 3 is a diagram illustrating a receiving device including a plurality of ultrasonic sensors. In the receiving device shown in FIG. 3A, two ultrasonic sensor sets 34 are arranged in the body direction of the application device 35 instead of one ultrasonic sensor. By installing two ultrasonic sensors, the ultrasonic reception area is expanded, and the amount of transmission power can be increased.

  In the receiving device illustrated in FIG. 3B, four ultrasonic sensors 36 are arranged in four directions of the application device 37 instead of one ultrasonic sensor. Even if the orientation of the receiving device in the living body changes due to an increase in the ultrasound reception angle, any one of the ultrasound sensors faces the direction of the ultrasound transducer that is the source, so that electrical energy can be transmitted efficiently. it can.

  Here, although two ultrasonic transducers are arranged in the body direction, the number of transducers is not limited to this, and other numbers may be used, and the arrangement may not be in the body direction. Also, the example in which four sensors are arranged in four directions may have other shapes such as octagonal surfaces.

  FIG. 4 is a diagram illustrating an in-vivo electrical energy supply apparatus including a plurality of ultrasonic transducers and a plurality of ultrasonic sensors. In the energy supply device shown in FIG. 4A, nine ultrasonic transducer sets 41 are arranged in a grid pattern. In addition, the ultrasonic sensor for reception also has two ultrasonic sensor sets 42 arranged in the body direction. By arranging a plurality of ultrasonic transducers and ultrasonic sensors for transmission / reception, even if the ultrasonic irradiation area increases and the position of the receiving device in the living body fluctuates, electric energy can be transmitted efficiently.

  The energy supply device shown in FIG. 4B has nine ultrasonic transducer sets 43 arranged in a lattice pattern on four sides of a box. Further, four ultrasonic sensors 44 are arranged in four directions for reception.

  Here, nine ultrasonic transducers arranged in a grid are arranged on the four sides of the box. However, the number of ultrasonic transducers is not limited to this, and the number of ultrasonic transducers may be changed. The arrangement may not be a grid. The arrangement of the boxes on the four surfaces may be other shapes such as a cylinder instead of the box.

  Also, here, two ultrasonic sensors are arranged in the body direction, but the number of ultrasonic sensors is not limited to this, and other numbers may be used, and the arrangement may not be in the body direction. Absent. Also, the example in which four sensors are arranged in four directions may have other shapes such as octagonal surfaces.

  FIG. 5 is a diagram illustrating an in-vivo electrical energy supply apparatus including a bed-type transmission device. As shown in FIG. 5A, the transmission device includes a plurality of ultrasonic transducers 51 as ultrasonic transmission means and a microwave communication device 52 for signal transmission on the bed. In addition, as shown in FIG. 5B, the ultrasonic transducer 51 and the microwave transmission device 52 for signal transmission form a set of units 50, and each unit 50 is arranged on a bed 53 in a grid pattern. Yes.

  While the subject (human body) 54 swallowing the capsule endoscope 55 is lying on the bed, the microwave communication device 52 for signal transmission of the unit 50 sequentially inputs the ID and position information of the unit 50 into the capsule type. It transmits to the endoscope 55. The capsule endoscope 55 returns the received unit information to the transmission side. Since the position of the capsule endoscope 55 is on the unit 50 that has received information, the position of the capsule endoscope 55 in the body can be grasped, and the ultrasonic transducer 51 in the unit 50 can be grasped. By oscillating the power, power can be transmitted to the capsule endoscope 55.

  As described above, in this embodiment, the ultrasonic transducer of the transmitting device arranged outside the living body oscillates strong ultrasonic waves by converting electric energy into ultrasonic energy, and the ultrasonic sensor of the receiving device in the living body. However, since the high-power ultrasonic wave is received, the ultrasonic energy is converted into electric energy and power is supplied to the application device, power can be efficiently supplied into the living body.

  As described above, the in-vivo electric energy supply apparatus, in-vivo electric energy supply method, in-vivo electric energy supply method, and energy reception apparatus according to the present invention are useful when installing power-driven application devices in the living body, It is suitable when using application equipment with high power consumption.

It is a functional block diagram which shows the structure of the in-vivo electrical energy supply apparatus which concerns on a present Example. It is a figure which shows the transmission device provided with the some ultrasonic transducer. It is a figure which shows the receiving device provided with the some ultrasonic sensor. It is a figure which shows the in-vivo electrical energy supply apparatus provided with the some ultrasonic transducer and the some ultrasonic sensor. It is a figure which shows the in-vivo electrical energy supply apparatus provided with the transmission device of the bed form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 Living body 10 Transmission device 12 Frequency converter 13 Power amplifier 14 Ultrasonic transducer 15 Powerful ultrasonic wave 20 Receiving device 21 Ultrasonic sensor 22 Rectifier circuit 23 Matching circuit 24 Accumulation circuit 30 Application apparatus 31 Ultrasonic transducer 32 Ultrasonic transducer 33 Nine pieces Set of two ultrasonic sensors 34 Set of two ultrasonic sensors 35 Application equipment 36 Ultrasonic sensors 37 Application equipment 41 Set of nine ultrasonic transducers 42 Set of two ultrasonic sensors 43 Set of nine ultrasonic transducers Set 44 Ultrasonic sensor 50 Unit 51 Ultrasonic transducer 52 Microwave communication device 53 Sleeper 54 Subject 55 Capsule endoscope

Claims (10)

In-vivo electricity comprising an energy transmitting device that transmits energy from outside the living body and an energy receiving device that receives the energy transmitted from the energy transmitting device in the living body and supplies electric energy to the in-vivo device. An energy supply device,
The energy transmitter is
Equipped with ultrasonic oscillation means for transmitting ultrasonic waves,
The energy receiver is
An in-vivo electric energy supply device comprising ultrasonic receiving means for receiving an ultrasonic wave oscillated by the ultrasonic oscillating means and converting it into electric energy. The energy transmitter is
It further comprises frequency conversion means for generating a pulse of a predetermined frequency from the AC power source,
2. The in-vivo electrical energy supply device according to claim 1, wherein the ultrasonic oscillation means oscillates an ultrasonic wave by resonating with a pulse having a predetermined frequency generated by the frequency conversion means. The energy transmitter is
Further comprising boosting means for boosting a pulse of a predetermined frequency generated by the frequency converting means;
The in-vivo electrical energy supply apparatus according to claim 2, wherein the ultrasonic oscillation means oscillates an ultrasonic wave in resonance with the pulse boosted by the boosting means.   The in-vivo electrical energy supply apparatus according to claim 1, 2 or 3, wherein the ultrasonic oscillation means is composed of a plurality of ultrasonic transducers. The ultrasonic wave receiving means receives the ultrasonic wave oscillated by the ultrasonic wave oscillating means and converts it into alternating current,
The living body according to any one of claims 1 to 4, wherein the energy receiving device further includes a rectifying unit that rectifies an alternating current converted from an ultrasonic wave by the ultrasonic receiving unit into a direct current. Electric energy supply device.   6. The in-vivo electrical energy supply apparatus according to claim 5, wherein the energy receiving apparatus further includes a matching unit that performs impedance matching with a reactance load included in the ultrasonic receiving unit. A plurality of in vitro wireless communication devices that are arranged corresponding to the plurality of ultrasonic transducers and wirelessly transmit and receive an identifier for identifying the device;
In vivo wireless communication device that receives and returns an identifier transmitted from the in vitro wireless communication device in vivo with the energy receiving device;
Further comprising
5. The ultrasonic transducer corresponding to the in vitro wireless communication device that has received the identifier returned by the in vivo wireless communication device among the plurality of in vitro wireless communication devices oscillates ultrasonic waves. The in-vivo electrical energy supply device according to 1. An in-vivo electric energy supply method for transmitting electric energy from the outside of a living body and supplying electric energy to an in-vivo device,
An ultrasonic oscillation process for oscillating ultrasonic waves from outside the living body;
An ultrasonic wave receiving step of receiving the ultrasonic wave oscillated by the ultrasonic wave oscillating step in a living body and converting it into electric energy;
An in-vivo electrical energy supply method comprising: An energy transmission device that receives transmitted energy in a living body and transmits energy to an energy receiving device that supplies electrical energy to the device in the living body,
An energy transmitting apparatus comprising: an ultrasonic oscillating means for transmitting energy by transmitting an ultrasonic wave received in vivo by the energy receiving apparatus and converted into electrical energy. An energy receiving device that receives energy in vivo from an energy transmission device that transmits energy from outside the living body and supplies electric energy to the in-vivo device,
An energy receiving device comprising: an ultrasonic wave receiving means for receiving an ultrasonic wave oscillated by the energy transmitting device and converting the ultrasonic wave into electric energy.

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