WO2010058682A1 - Dispositif médical encapsulé, dispositif d'alimentation électrique et système d'alimentation électrique - Google Patents

Dispositif médical encapsulé, dispositif d'alimentation électrique et système d'alimentation électrique Download PDF

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Publication number
WO2010058682A1
WO2010058682A1 PCT/JP2009/068423 JP2009068423W WO2010058682A1 WO 2010058682 A1 WO2010058682 A1 WO 2010058682A1 JP 2009068423 W JP2009068423 W JP 2009068423W WO 2010058682 A1 WO2010058682 A1 WO 2010058682A1
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WO
WIPO (PCT)
Prior art keywords
power
power transmission
reactance
transmission coil
unit
Prior art date
Application number
PCT/JP2009/068423
Other languages
English (en)
Japanese (ja)
Inventor
憲 佐藤
洋志 祝迫
秀治 宮原
吉田　直樹
Original Assignee
オリンパス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2008294794A external-priority patent/JP5415744B2/ja
Priority claimed from JP2008297042A external-priority patent/JP5174628B2/ja
Application filed by オリンパス株式会社 filed Critical オリンパス株式会社
Priority to EP09827463.2A priority Critical patent/EP2347698A4/fr
Priority to CN200980146071.XA priority patent/CN102215733B/zh
Publication of WO2010058682A1 publication Critical patent/WO2010058682A1/fr
Priority to US13/108,339 priority patent/US8915840B2/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00002—Operational features of endoscopes
    • A61B1/00011—Operational features of endoscopes characterised by signal transmission
    • A61B1/00016—Operational features of endoscopes characterised by signal transmission using wireless means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00002—Operational features of endoscopes
    • A61B1/00025—Operational features of endoscopes characterised by power management
    • A61B1/00027—Operational features of endoscopes characterised by power management characterised by power supply
    • A61B1/00029—Operational features of endoscopes characterised by power management characterised by power supply externally powered, e.g. wireless
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
    • A61B1/041—Capsule endoscopes for imaging
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/56—Details of data transmission or power supply, e.g. use of slip rings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00002—Operational features of endoscopes
    • A61B1/00025—Operational features of endoscopes characterised by power management
    • A61B1/00027—Operational features of endoscopes characterised by power management characterised by power supply
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/02—Operational features
    • A61B2560/0204—Operational features of power management
    • A61B2560/0214—Operational features of power management of power generation or supply
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/10—The network having a local or delimited stationary reach
    • H02J2310/20—The network being internal to a load
    • H02J2310/23—The load being a medical device, a medical implant, or a life supporting device

Definitions

  • the present invention relates to a capsule medical device that is introduced into the body of a subject and performs predetermined processing, a power feeding device that wirelessly feeds power to the capsule medical device from outside the subject, and the capsule medical device.
  • the present invention relates to a power feeding system including the power feeding device.
  • capsule endoscopes equipped with an imaging function and a wireless function have appeared.
  • the capsule endoscope is swallowed by the subject, who is the subject for observation, and then moves inside the organs such as the stomach and small intestine with peristalsis until it is naturally discharged from the subject. Move and sequentially image the inside of the organ using the imaging function.
  • Image data captured in the subject by the capsule endoscope while moving in the organ is sequentially transmitted to an external device provided outside the subject by a wireless function such as wireless communication, and stored in a memory. Accumulated.
  • an external device having a wireless function and a memory function, the subject can behave without inconvenience during the observation period from swallowing the capsule endoscope until it is discharged.
  • an image of the organ is displayed on a display unit such as a display based on the image data stored in the memory of the external device, and diagnosis is performed by a doctor.
  • Japanese Patent No. 4080666 discloses a system that wirelessly feeds power to a capsule endoscope.
  • a radio capsule corresponding to a capsule endoscope
  • the capsule endoscope is transmitted by transmitting power from the outside of the subject to the inside of the capsule endoscope.
  • Supply power inside the mirror a power transmission antenna is provided in the external device, and a power reception antenna is provided in the capsule endoscope. Power is supplied from the external device to the capsule endoscope via the transmission antenna and the reception antenna.
  • Japanese Patent No. 4089778 discloses a configuration in which a power feeding device induces electrical energy in a power receiving coil of a capsule in a body by a magnetic field generated by a three-axis power transmitting coil wound around the body of a subject. have.
  • the conventional capsule medical device has poor compatibility between the power receiving coil and the processing circuit that consumes the received power, and can receive only power that is smaller than the maximum power that can be received, that is, the power receiving efficiency is low. was there.
  • the inductance changes when the shape of the power transmission coil changes. For this reason, the situation where a resonance state is canceled frequently occurs, and the supply efficiency at the time of supplying energy may decrease.
  • An object of the present invention is to provide a capsule medical device that efficiently receives power, a power supply device that efficiently transmits power, and a power supply system that includes the capsule medical device and the power supply device.
  • a capsule medical device is a capsule medical device that receives power from outside the body of a subject and performs a predetermined process in the body, and a processing circuit that performs the predetermined process in the body And a power receiving coil that wirelessly receives power from outside the body, a power receiving resonant capacitor, and an adjustment reactance unit that can adjust a reactance connected to the power receiving coil and the power receiving resonant capacitor. And adjusting the reactance of the adjustment reactance unit to match the impedance of the processing circuit with the impedance of the power receiving circuit.
  • a power supply apparatus is a power supply apparatus that wirelessly supplies power from outside the subject's body to a capsule medical device that performs a predetermined process in the body of the subject, A power transmission coil that generates an alternating magnetic field, disposed outside the body of the subject, a power transmission resonance capacitor connected in series to the power transmission coil, and a power transmission coil drive unit that drives the power transmission coil, The power transmission coil driving unit performs control to return the AC magnetic field to the resonance state when detecting the cancellation of the resonance state of the AC magnetic field.
  • a power supply system is a power supply system including a capsule medical device and a power supply device, wherein the capsule medical device wirelessly receives power from outside the body of the subject.
  • a capsule medical device that performs a predetermined process in the power supply device, wherein the power supply device wirelessly supplies power to the capsule medical device inside the body from outside of the subject, the capsule medical device
  • a device adjusts reactance connected to a processing circuit that performs the predetermined processing in the body, a power receiving coil that receives power from outside the body, a power receiving resonance capacitor, and the power receiving coil and the power receiving resonance capacitor
  • a power receiving circuit that is a resonance circuit having a predetermined resonance frequency, and a reactor of the adjustment reactance unit.
  • the power feeding device By adjusting the impedance of the processing circuit and the impedance of the power receiving circuit, the power feeding device includes a power transmission coil that generates an alternating magnetic field, and a power transmission resonance capacitor connected in series to the power transmission coil.
  • a power transmission coil drive unit that drives the power transmission coil, and the power transmission coil drive unit detects cancellation of the resonance state of the AC magnetic field due to a rapid decrease in drive current or a rapid increase in drive voltage. Then, control to return to the resonance state is performed.
  • 1 is a schematic diagram illustrating an outline of a power feeding system including a capsule endoscope according to a first embodiment.
  • 1 is a configuration diagram of a power feeding system including a capsule endoscope according to a first embodiment. It is a cross-sectional schematic diagram for demonstrating the outline
  • the capsule endoscope 20 (hereinafter, also referred to as “endoscope”) of the power feeding system 1 of the present embodiment is introduced into a subject 50 while being examined. Electricity is received wirelessly by electromagnetic induction from the power feeding device 10 disposed outside the person 50. That is, in the power feeding device 10, an alternating current is applied from the power transmission circuit 12 to the power transmission coil 11, and the power transmission coil 11 generates an alternating magnetic field.
  • the endoscope 20 includes a power receiving circuit 22 that receives power from the power supply apparatus 10 and a processing circuit 25 that performs a plurality of types of predetermined processing using the received power.
  • the power receiving circuit 22 includes a circuit 21A in which a power receiving coil 21 and an adjusting reactance unit 23 including an adjusting reactance element are connected in series, and a power receiving capacitor 24 for resonance connected in parallel with the circuit 21A and a processing circuit 25.
  • a reception resonance circuit having a predetermined resonance frequency.
  • the power receiving coil 21 is a solenoid type coil having a predetermined number of turns around which a conductive wire is wound, and the axis of the coil is in the longitudinal direction of the capsule in the body of the elongated capsule type casing 31 (see FIG. 3). It is arranged.
  • the axis of the coil means the center line of the magnetic path of the coil.
  • the power receiving coil 21 may be wound around a part of the capsule casing 31, may have a soft magnetic core inside, or may be wound around the outside of the capsule casing 31. It may be.
  • the power receiving capacitor 24 is a capacitor for substantially matching, that is, matching, the resonance frequency of the power receiving circuit 22 and the frequency of the magnetic field generated by the power feeding device 10.
  • the processing circuit 25 includes a power reception control circuit 26, a transmission / reception control circuit 27, a CCD 29 that is an image sensor, a signal processing circuit 30, and an illumination unit 32.
  • the capsule medical device includes a power receiving circuit 22 and a processing circuit 25 that are built in an elongated capsule type casing 31 that can be introduced into the body of a subject 50. It is the endoscope 20 which has.
  • the endoscope 20 is of a size that can be swallowed into the body from the oral cavity of a subject, and is made of a substantially hemispherical tip cover 31A that is transparent or translucent, and a colored material that does not transmit visible light.
  • a capsule-type casing 31 that seals the inside in a liquid-tight manner is formed by elastically fitting the end cover 31B having a substantially hemispherical cylindrical body cover 31B.
  • the endoscope 20 is in a capsule-type housing 31, and has an illumination unit 32 such as an LED that emits illumination light for illuminating an intracorporeal imaging region via the tip cover 31A, and reflected light from the illumination light.
  • an illumination unit 32 such as an LED that emits illumination light for illuminating an intracorporeal imaging region via the tip cover 31A, and reflected light from the illumination light.
  • a CCD 29 that receives light to capture an image of a body cavity and an imaging lens 33 that forms an image of a subject on the CCD 29 is provided, and imaging in the front end direction on the tip cover 31A side is possible.
  • the signal processing circuit 30 processes the captured image, and the transmission / reception control circuit 27 has a function of transmitting the captured image wirelessly outside the body.
  • the transmission / reception control circuit 27 processes various control signals superimposed on an AC magnetic field that is a power supply signal. Based on the control signals, the LED lighting process by the illumination unit 32, and the CCD 29 A plurality of processes such as an imaging process, an image process by the signal processing circuit 30, or a captured image transmission process by the transmission / reception control circuit 27 are controlled.
  • the processing load performed by the processing circuit 25 of the endoscope 20 differs depending on the type of the endoscope 20, in other words, the processing performed.
  • a capsule endoscope having a CCD that performs high-resolution color imaging has a smaller processing circuit load than a capsule endoscope that performs only low-resolution monochrome imaging.
  • the load on the processing circuit 25 of each product differs due to variations in manufacturing. For this reason, the impedance of the power receiving circuit 22 and the impedance of the processing circuit 25 may be shifted.
  • the impedance of the processing circuit 25 that is a load, the impedance of the power receiving circuit 22 and the impedance of the processing circuit 25 are substantially the same, that is, if they do not match, the power is originally smaller than the maximum power that can be received. Cannot receive power.
  • the impedance of the power receiving circuit 22 when the impedance of the power receiving circuit 22 is Z1, the relationship between the impedance of the load and the received power is the received power characteristic indicated by F1, and the impedance of the processing circuit 25 that is the load is The received power is the maximum P2 when Z1.
  • the load impedance deviates from Z1 as in Z2 or Z3, the received power decreases to P1.
  • the endoscope 20 since the endoscope 20 according to the present embodiment has the adjustment reactance unit 23 in the power receiving circuit 22, impedance matching between the power receiving circuit 22 and the processing circuit 25 can be performed. That is, as shown in FIG. 5, when the load is large and the impedance is as small as Z2, the impedance of the power receiving circuit 22 can be adjusted to Z2 by using a capacitive adjustment reactance element, and the received power characteristics become like F2. Similarly, when the load is small and the impedance is as large as Z3, the impedance of the power receiving circuit 22 can be adjusted to Z3 by using an inductive adjustment reactance element, and the received power characteristic becomes F3. .
  • the impedance of the power receiving circuit 22 can be adjusted by the size of the power receiving coil 21, the number of turns of the winding, the presence or absence of magnetic cores, characteristics, and the like.
  • the endoscope 20 in which electronic parts must be stored in an extremely small space, there are restrictions such as the volume of the power receiving coil 21 and it is not easy to adjust them.
  • the value of the power receiving capacitor 24 is adjusted in accordance with the connected capacitive adjustment reactance element.
  • the reactance of the adjustment reactance unit 23 is adjusted at the time of manufacture.
  • the endoscope 20 has a constant load impedance Z ⁇ b> 2 with respect to the passage of time, i.e., driving of each processing of the processing circuit 25, the power receiving circuit 22 is received by the adjustment reactance unit 23. Is adjusted from Z1 to Z2.
  • the impedance of the load changes with the passage of time, that is, the driving of each process of the processing circuit 25, (A) the impedance is the highest.
  • the power receiving circuit 22 is adjusted by a method such as matching to the large state Z13, (B) matching to the average impedance Z12, (C) matching to the impedance Z11 when the operating state is the longest, and (D) matching to the state Z10 having the smallest impedance. Is adjusted by the adjusting reactance unit 23.
  • the adjustment reactance unit 23 and the power receiving capacitor 24 are configured by value variable elements, and the impedance is adjusted.
  • the endoscope 20 can receive power efficiently because the impedance of the processing circuit 25 and the impedance of the power receiving circuit 22 are matched by adjusting or selecting the adjustment reactance unit 23. it can. That is, the power feeding system 1 has good power transmission / reception efficiency.
  • a power feeding system 1A and an endoscope 20A according to a modification of the first embodiment of the present invention will be described with reference to the drawings.
  • the capsule endoscope 20A according to the modification of the first embodiment is similar to the endoscope 20 of the first embodiment, and therefore the same components are denoted by the same reference numerals, and the description thereof will be omitted. Omitted.
  • the endoscope 20A of the power feeding system 1A of the present embodiment includes a power receiving coil 21, an adjustment reactance unit 23, and a power receiving capacitor 24.
  • the power receiving coil 21 and the adjustment reactance unit 23 is connected in parallel, a circuit 21A having a power receiving coil 21 and an adjustment reactance unit 23, and a power receiving capacitor 24 are connected in series.
  • the endoscope 20A of this modification includes an adjustment reactance unit 23 By adjusting the reactance, the impedance of the processing circuit 25A and the impedance of the power receiving circuit 22A are matched, so that power can be received efficiently. That is, the power feeding system 1A has high power transmission / reception efficiency.
  • the endoscope 20B of the present embodiment further includes an adjustment reactance unit 23B and a reactance adjustment circuit 28.
  • the reactance adjustment circuit 28 adjusts the reactance of the reactance unit 23B for adjustment based on the control signal received by the transmission / reception control circuit 27.
  • the plurality of predetermined processes performed by the processing circuit 25B of the endoscope 20B have different loads. For example, since the LED lighting process by the illumination unit 32 has a large load and a low impedance, the impedance of the processing circuit 25B varies between when the lamp is lit and when it is not lit. For this reason, the impedance of the power receiving circuit 22B and the impedance of the processing circuit 25B are shifted.
  • a plurality of processes performed by the processing circuit 25B for example, a plurality of processes such as an LED lighting process by the illumination unit 32, an imaging process by the CCD 29, an image process by the signal processing circuit 30, or a captured image transmission process by the transmission / reception control circuit 27, etc.
  • the transmission / reception control circuit 27 processes various control signals superimposed on the power supply signal, and is performed based on the control signals.
  • the reactance adjustment circuit 28 adjusts the reactance of the adjustment reactance unit 23B in accordance with each process performed based on the control signal received by the transmission / reception control circuit 27.
  • the adjustment reactance unit 23B includes an adjustment reactance element group 35 having reactance elements 35A to 35N having N different reactances, and N switches 36A to 36A for switching the reactance elements connected to the power receiving coil 21. And a reactance adjustment switch unit 36 having 36N.
  • the adjustment reactance unit 23B may have at least two reactance elements, or may have a variable amount reactance element having a function corresponding to a plurality of reactance elements having different reactances.
  • the reactance elements 35A to 35N that match each process performed by the processing circuit 25B are determined in advance. Therefore, the adjustment reactance unit 23B can adjust the reactance of the power receiving circuit 22B so as to match the impedance of each process performed by the processing circuit 25B.
  • the adjustment reactance unit 23B selects the positive large reactance element 35A in the process A, selects the positive reactance element 35B in the process B, and negative in the process C. Reactance element 35C is selected, and in the process D, a large negative reactance element 35D is selected.
  • the reactance adjustment circuit 28 adjusts the reactance of the reactance unit 23B for adjustment, so that the processing circuit Since the impedance and the impedance of the power receiving circuit 22B are matched according to the processing of 25B, power can be received efficiently. That is, the power feeding system 1B has high power transmission / reception efficiency.
  • the reactance adjustment circuit 28 adjusts the reactance based on the processing information received by the transmission / reception control circuit 27, and thus has a simple configuration and is less likely to cause a follow-up delay. That is, the time until each process is actually performed by the process control signal received by the transmission / reception control circuit 27 is finite, and the reactance adjustment circuit 28 switches the reactance adjustment switch unit 36 during that time, so that the impedance of the processing circuit 25B It can follow the speed of change.
  • the reactance part 23B for adjustment can respond
  • the endoscope 20 ⁇ / b> C of the power feeding system 1 ⁇ / b> C of the present embodiment further includes a load detection circuit 37.
  • the load detection circuit 37 measures the load of the processing circuit 25C, in other words, the impedance in real time.
  • the reactance adjustment circuit 28 ⁇ / b> C adjusts the reactance of the power receiving circuit 22 ⁇ / b> C based on the information of the load detection circuit 37.
  • the load detection circuit 37 may detect the impedance at a predetermined interval, and the reactance adjustment circuit 28C may adjust the reactance at a predetermined interval.
  • the reactance adjustment circuit 28C adjusts the reactance of the adjustment reactance unit 23C in addition to the effects of the endoscope 20 of the first embodiment. Since the impedance and the impedance of the power receiving circuit 22C are matched according to the processing of 25C, power can be received efficiently. That is, the power feeding system 1C has high power transmission / reception efficiency.
  • the reactance adjustment circuit 28C of the present embodiment is highly accurate because the reactance is adjusted based on the impedance of the processing circuit 25C detected by the load detection circuit 37.
  • a power feeding system 1D of the present embodiment includes a power feeding device 10D that is disposed around the outside of the body of the subject 50, and a capsule endoscope 20D that is disposed within the body of the subject. Have. Unlike the endoscopes 20 to 20C already described, the endoscope 20D does not include an adjustment reactance unit or the like.
  • the power feeding device 10 ⁇ / b> D includes a power transmission coil 11 ⁇ / b> D, a power transmission resonance capacitor (hereinafter also referred to as “power transmission capacitor”) 13 connected in series to one end of the power transmission coil 11 ⁇ / b> D, and power transmission.
  • a coil length adjustment unit 14 disposed on the other end side of the coil 11D, a conductive wire member 15 that electrically connects the power transmission coil 11D and the coil length adjustment unit 14, and a power transmission coil drive unit that drives the power transmission coil 11D (hereinafter referred to as the coil transmission unit 11D).
  • a power supply unit 17 that supplies electric power to the power transmission coil drive unit 16.
  • the power transmission coil 11 ⁇ / b> D has one end connected to the power transmission coil drive unit 16 via the power transmission capacitor 13 and the other end connected to the power transmission coil drive unit 16 via the conductor member 15 and the coil length adjustment unit 14. .
  • the coil length adjusting unit 14 and the power transmission coil 11D which are conductors, are integrated and function as a variable inductance coil, but may be formed separately.
  • one end side of the coil length adjusting unit 14 has a circular shape having a diameter substantially the same as the coil diameter of the power transmission coil 11D and the center axis coinciding with the center axis of the power transmission coil 11D. It is formed as a conducting wire. Further, the other end side of the coil length adjusting unit 14 is connected to the power transmission coil driving unit 16.
  • the conducting wire member 15 electrically connects the other end side of the power transmission coil 11 ⁇ / b> D and one end side of the coil length adjustment unit 14. Moreover, the conducting wire member 15 is movable along the circular conducting wire on one end side of the coil length adjusting unit 14 according to the control of the transmitting coil driving unit 16, and the length of the conducting wire member 15 is set to the length of the transmitting coil 11D. It is configured to be variable with respect to the vertical direction. That is, the conducting wire member 15 electrically connects the other end side of the power transmission coil 11 ⁇ / b> D and the one end side of the coil length adjusting unit 14 while short-circuiting.
  • the power transmission coil drive unit 16 is connected to the power transmission capacitor 13 and the other end side of the coil length adjustment unit 14. Moreover, the power transmission coil drive part 16 changes the short circuit position of the power transmission coil 11D by the conducting wire member 15 when detecting that the resonance state of the transmission resonance circuit composed of the power transmission coil 11D and the power transmission capacitor 13 is released. Thus, the coil length of the power transmission coil 11D is adjusted.
  • the inductance of the series circuit including the power transmission coil driving unit 16, the power transmission capacitor 13, the power transmission coil 11D, the conductive wire member 15, and the coil length adjusting unit 14 is changed.
  • the power transmission coil 11D is disposed around the outside of the body of the subject 50, and the endoscope 20D is disposed within the body of the subject.
  • the endoscope 20D includes a power receiving resonance circuit (power receiving circuit) 22 including a power receiving coil 21 that generates a current corresponding to an external magnetic field. Note that the resonance frequency of the transmission resonance circuit and the resonance frequency of the power reception resonance circuit 22 are set to be substantially the same.
  • an alternating current having a resonance frequency of the power transmission resonance circuit is output from the power transmission coil drive unit 16 as a drive current for driving the power transmission coil 11D. Then, an AC magnetic field having a frequency that matches the resonance frequency of the power reception resonance circuit 22 of the endoscope 20 ⁇ / b> D is generated from the power supply device 10.
  • the power transmission coil drive unit 16 monitors the current or voltage supplied to the power transmission coil 11D. That is, the power transmission coil driving unit 16 monitors the driving current in the case of constant voltage driving and the driving voltage in the case of constant current driving.
  • the resonance state of the transmission resonance circuit is released. That is, the power transmission coil driving unit 16 continues to apply a drive current having a resonance frequency of the transmission resonance circuit when the power transmission coil 11D is not deformed to the power transmission coil 11D. Then, the power feeding device 10D cannot efficiently generate a magnetic field.
  • the power transmission coil drive unit 16 of the power supply apparatus 10D detects the cancellation of the resonance state of the transmission resonance circuit based on a rapid decrease in the drive current supplied to the power transmission coil 11D or a rapid increase in the drive voltage. And if the power transmission coil drive part 16 detects cancellation
  • the conducting wire member 15 changes its length while moving along a circular conducting wire on one end side of the coil length adjusting unit 14 according to control of the power transmission coil driving unit 16.
  • the power transmission coil drive unit 16 monitors the drive current or drive voltage supplied to the power transmission coil 11D while changing the short-circuit position of the power transmission coil 11D by the conductor member 15. And if power transmission coil drive part 16 detects that drive current or drive voltage returned to the previous state based on a monitoring result, it will perform control for fixing short circuit position of power transmission coil 11D by conducting wire member 15.
  • the power transmission coil driving unit 16 adjusts the coil length of the power transmission coil 11D so as to obtain an inductance that can restore the resonance state of the transmission resonance circuit, and the resonance driving at the predetermined resonance frequency described above is performed.
  • the original magnetic field is generated from the power feeding device 10D.
  • the power transmission coil driving unit 16 may detect the cancellation of the resonance state of the transmission resonance circuit based on a change in the magnetic field intensity actually generated by the power transmission coil 11D using, for example, a magnetic field sensor (not shown). . Moreover, the power transmission coil drive part 16 may detect resonance state cancellation
  • the power feeding device 10D of the present embodiment can quickly return the resonance state by adjusting the inductance of the power transmission coil 11D even when the resonance state is released. That is, the power feeding system 1D and the power feeding device 10D of the present embodiment have high efficiency of power transmission and reception by radio.
  • a power feeding system 1E and a power feeding apparatus 10E according to a fifth embodiment of the present invention will be described. Since the power feeding system 1E and the power feeding device 10E are similar to the power feeding system 1D and the power feeding device 10D of the fourth embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
  • the power feeding device 10E includes a power transmission coil 11E, a power transmission capacitor 13 connected in series to one end side of the power transmission coil 11E, and a switch group 15A disposed on the other end side of the power transmission coil 11E.
  • the power transmission coil drive unit 16 that drives the power transmission coil 11E and the power supply unit 17 that supplies power to the power transmission coil drive unit 16 are provided.
  • the power transmission coil 11E has one end connected to the power transmission coil drive unit 16 via the power transmission capacitor 13 and the other end connected directly to the power transmission coil drive unit 16.
  • the switch group 15 ⁇ / b> A includes a plurality of switches that can be electrically connected between a lead wire on the other end side of the power transmission coil 11 ⁇ / b> E and a lead wire that is one turn inside from the extreme end portion. It is comprised by. Further, the switch group 15 ⁇ / b> A has a configuration capable of switching on / off of each switch in accordance with the control of the power transmission coil driving unit 16.
  • the power transmission coil drive unit 16 of the power supply apparatus 10E When detecting the cancellation of the resonance state of the transmission resonance circuit, the power transmission coil drive unit 16 of the power supply apparatus 10E returns the resonance state, and turns on one of the switches included in the switch group 15A. Take control.
  • the power transmission coil drive unit 16 monitors the drive current or drive voltage supplied to the power transmission coil 11E while sequentially switching the switches to be turned on by the switch group 15A. Then, when the power transmission coil driving unit 16 detects that the driving current or the driving voltage has returned to the previous state based on the monitoring result, the power transmission coil driving unit 16 performs control for fixing the on / off state of each switch of the switch group 15A.
  • the power transmission coil driving unit 16 performs the above-described control, so that the coil length of the power transmission coil 11E is adjusted so as to have an inductance that can restore the resonance state of the transmission resonance circuit, and a magnetic field in a predetermined resonance state is supplied to the power feeding device 10E. Arising from.
  • the power feeding system 1E and the power feeding apparatus 10E according to the present embodiment quickly recovers the resonance state by appropriately adjusting the inductance of the power transmission coil 11E even when the resonance state is released. Can be made. That is, in other words, the power supply system 1E and the power supply apparatus 10E of the present embodiment have good power transmission / reception efficiency.
  • the power feeding device 10 ⁇ / b> F includes a power transmission coil 11 ⁇ / b> F disposed around the subject's body, a resonance power transmission capacitor 13 connected in series to one end side of the power transmission coil 11 ⁇ / b> F, A switch group 15B that can electrically connect the conductive wires constituting the power transmission coil 11F, a power transmission coil drive unit 16 that drives the power transmission coil 11F, and a power source unit 17 that supplies power to the power transmission coil drive unit 16, have.
  • the power transmission coil 11 ⁇ / b> F has one end side connected to the power transmission coil driving unit 16 via the power transmission capacitor 13 and the other end side directly connected to the power transmission coil driving unit 16.
  • the switch group 15 ⁇ / b> B is configured by switches having approximately the same number or the same number as the number of turns of the power transmission coil 11 ⁇ / b> F provided from one end side to the other end side of the power transmission coil 11 ⁇ / b> F as shown in FIG. 15.
  • the switch group 15 ⁇ / b> B has a configuration capable of switching on / off of each switch in accordance with the control of the power transmission coil driving unit 16.
  • the power transmission coil drive unit 16 of the power supply apparatus 10F When detecting the cancellation of the resonance state of the power transmission resonance circuit, the power transmission coil drive unit 16 of the power supply apparatus 10F returns at least one of the switches included in the switch group 15B in order to restore the resonance state. Take control.
  • the power transmission coil driving unit 16 monitors the driving current or the driving voltage while sequentially switching the switches to be turned on in the switch group 15B. Then, when the power transmission coil driving unit 16 detects that the driving current or the driving voltage has returned to the previous state based on the monitoring result, the power transmission coil driving unit 16 performs control for fixing the on / off state of each switch of the switch group 15B.
  • the power transmission coil driving unit 16 performs the above-described control, so that the coil length of the power transmission coil 11F is adjusted so that the resonance state of the power transmission resonance circuit can be recovered, and the magnetic field in a predetermined resonance state is supplied to the power feeding device 10F. Arising from.
  • the power feeding system 1F and the power feeding apparatus 10F according to the present embodiment quickly recovers the resonance state by appropriately adjusting the inductance of the power transmission coil 11F even when the resonance state is released. Can be made. That is, in other words, the power feeding system 1F and the power feeding device 10F of the present embodiment have good power transmission / reception efficiency.
  • the power supply apparatus 10F can adjust the inductance of the power transmission coil 11F without narrowing the power supply range by switching the on / off state of each switch of the switch group 15B according to a predetermined pattern such as every other switch. it can.
  • the power feeding device 10G includes a power transmission coil 11G, a power transmission capacitor 13 connected in series to one end side of the power transmission coil 11G, and a power transmission device connected to the other end side of the power transmission coil 11G.
  • An inductance adjustment unit 15C, a power transmission coil driving unit 16 that drives the power transmission coil 11G, and a power source unit 17 that supplies power to the power transmission coil driving unit 16 are provided.
  • One end side of the power transmission coil 11G is connected to the power transmission coil drive unit 16 via the power transmission capacitor 13, and the other end side is connected to the power transmission coil drive unit 16 via the power transmission inductance adjustment unit 15C.
  • the power transmission inductance adjusting unit 15C has a configuration in which a plurality of auxiliary coils 12a are connected in series and parallel. Further, a switch 15C2 for switching the electrical conduction state of each auxiliary coil 15C1 is connected in parallel to each of the plurality of auxiliary coils 15C1.
  • the power transmission coil driving unit 16 of the power supply apparatus 10G When detecting the cancellation of the resonance state of the power transmission resonance circuit, the power transmission coil driving unit 16 of the power supply apparatus 10G performs control for turning off at least one of the switches 15C2 in order to restore the resonance state.
  • the power transmission coil driving unit 16 monitors the driving current or the driving voltage while sequentially switching the switch to be turned off from the switches 15C2. Then, when detecting that the drive current or the drive voltage has returned to the previous state based on the monitoring result, the power transmission coil drive unit 16 performs control for fixing the on / off state of each switch 15C2.
  • the power transmission coil driving unit 16 performs the above-described control, so that the power transmission resonance adjustment unit 15C performs adjustment for setting the resonance state of the power transmission resonance circuit to be recoverable, and the magnetic field in the predetermined resonance state described above. Is generated from the power feeding device 10G.
  • the power feeding system 1G and the power feeding device 10G according to the present embodiment have the power transmission inductance adjusting unit 15C according to the amount of change in the inductance of the power transmission coil 11G even when the resonance state is released.
  • the resonance state can be quickly returned. That is, in other words, the power feeding system 1G and the power feeding device 10G of the present embodiment have good power transmission / reception efficiency.
  • the power feeding device 10H includes a power transmission coil 11H arranged around the body of the subject, a power transmission capacitor 13 connected in series to one end side of the power transmission coil 11H, and a power transmission coil 11H.
  • the capacitance adjustment unit 15D connected to the other end of the power transmission, the bypass line 15D3 connected to the other end of the power transmission coil 11H, the power transmission coil driving unit 16 that drives the power transmission coil 11H, and the power transmission coil driving unit 16 And a power supply unit 17 for supplying power to the.
  • the power transmission coil 11H has one end connected to the power transmission coil drive unit 16 via the power transmission capacitor 13, and the other end connected to the power transmission coil drive unit 16 via the capacitance adjustment unit 15D and the bypass line 15D3.
  • the capacitance adjustment unit 15D is provided between the other end of the power transmission coil 11H and the power transmission coil driving unit 16, and has a configuration in which a plurality of auxiliary capacitors 15D1 are connected in parallel. is doing.
  • a switch 15D2 for switching the electrical conduction state of each auxiliary capacitor 15D1 is connected in series to each of the plurality of auxiliary capacitors 15D1.
  • the bypass line 15D3 connects the other end side of the power transmission coil 11H and the power transmission coil drive unit 16 while bypassing the capacitance adjustment unit 15D.
  • the switch 15D4 provided in the middle of the bypass line 15D3 has a configuration that can be switched on and off in accordance with the control of the power transmission coil driving unit 16.
  • the power transmission coil drive unit 16 of the power supply apparatus 10H When detecting the cancellation of the resonance state of the power transmission resonance circuit, the power transmission coil drive unit 16 of the power supply apparatus 10H turns off the switch 15D4 and turns on at least one of the switches 15D2 to restore the resonance state. Control for.
  • a current flows through the auxiliary capacitor 15D1 corresponding to the turned on switch 15D2.
  • the power transmission coil drive unit 16 monitors the drive current or drive voltage supplied to the power transmission coil 11H while sequentially switching the switches to be turned on from the switches 15D2 while the switch 15D4 is turned off.
  • the power transmission coil drive unit 16 fixes the switch 15D4 to be off and also fixes the on / off state of each switch 15D2. Control for.
  • the power transmission coil driving unit 16 performs the above-described control, so that the capacitance adjustment unit 15D performs adjustment for making the capacitance that can restore the resonance state of the power transmission resonance circuit, and the magnetic field in the predetermined resonance state described above is fed. Generated from device 10H.
  • the capacitance of each auxiliary capacitor 15D1 of the capacitance adjusting unit 15D is set to a geometric ratio of 1/2, such as C, C / 2, C / 4, C / 8,.
  • a geometric ratio of 1/2 such as C, C / 2, C / 4, C / 8,.
  • the total number of auxiliary capacitors 15D1 and / or switches 15D2 constituting the capacitance adjustment unit 15D can be reduced.
  • a variable capacitor may be used as the capacitance adjustment unit 15D, or a variable capacitor having the function of the capacitance adjustment unit 15D may be used as the power transmission resonance capacitor 13.
  • the power feeding system 1H and the power feeding apparatus 10H according to the present embodiment have the capacitance of the capacitance adjusting unit 15D according to the amount of change in the inductance of the power transmission coil 11H even when the resonance state is canceled.
  • the resonance state can be quickly restored. That is, in other words, the power feeding system 1H and the power feeding apparatus 10H of the present embodiment have high power transmission / reception efficiency.
  • the capacitance adjusting unit 15D included in the power feeding device 10H may be used in combination with the configuration of the power feeding devices 10D to 10G.
  • the electric power feeding system 1J of the 8th Embodiment of this invention is demonstrated.
  • the power feeding system 1J according to the present embodiment is similar to the power feeding system and the power feeding apparatus according to the embodiments already described, and therefore the same components are denoted by the same reference numerals and description thereof is omitted.
  • the power feeding system 1 ⁇ / b> J includes a capsule endoscope 20 that wirelessly receives power from outside the subject 50 and performs predetermined processing in the body, and the subject 50. It consists of a power feeding device that feeds power to the capsule endoscope 20 in the body wirelessly from outside the body.
  • the capsule endoscope 20 includes a processing circuit 22 that performs a predetermined process in the body, a power receiving coil 21 that receives power from outside the body, and a power receiving circuit 22 that includes an adjustment reactance unit 23. By adjusting the reactance of the reactance unit 23, the impedance of the processing circuit 25 and the impedance of the power receiving circuit 22 are matched.
  • the power feeding device 10D includes a power transmission coil 11D that generates an alternating magnetic field, a power transmission resonance capacitor 13 that is connected in series to the power transmission coil 11D, and a power transmission coil driving unit 16 that drives the power transmission coil 11D.
  • the unit 16 detects that the resonance state has been canceled due to a rapid decrease in the drive current or a rapid increase in the drive voltage, the unit 16 performs control to match the frequency of the alternating magnetic field with the resonance frequency.
  • the power feeding device 11D efficiently transmits power, and the capsule endoscope 20 receives power efficiently, so that power transmission / reception efficiency is good.
  • any one of the capsule endoscopes 20 and 20A to 20C of the first to third embodiments and the modified examples, and the power feeding devices 11D to 11H of the fourth to eighth embodiments are used. You may combine with either.
  • a capsule endoscope has been described as an example of a capsule medical device.
  • various capsule medical devices such as a capsule medical device for collecting digestive juice, a swallowing pH sensor, or a drug delivery system. It is applicable to.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Surgery (AREA)
  • Medical Informatics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Biophysics (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
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  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Endoscopes (AREA)

Abstract

L'invention porte sur un endoscope encapsulé (20) comprenant : un circuit de traitement (25) qui exécute un processus prédéterminé à l'aide d'une bobine de réception (21) recevant par radio une alimentation provenant de l'extérieur d'une personne à examiner (50) ; et une unité de réglage de réactance (23) pouvant régler la réactance connectée à la bobine de réception (21).
PCT/JP2009/068423 2008-11-18 2009-10-27 Dispositif médical encapsulé, dispositif d'alimentation électrique et système d'alimentation électrique WO2010058682A1 (fr)

Priority Applications (3)

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EP09827463.2A EP2347698A4 (fr) 2008-11-18 2009-10-27 Dispositif médical encapsulé, dispositif d'alimentation électrique et système d'alimentation électrique
CN200980146071.XA CN102215733B (zh) 2008-11-18 2009-10-27 胶囊型医疗装置、供电装置以及供电系统
US13/108,339 US8915840B2 (en) 2008-11-18 2011-05-16 Capsule-type medical device, power supply apparatus, and power supply system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2008294794A JP5415744B2 (ja) 2008-11-18 2008-11-18 カプセル型医療装置
JP2008-294794 2008-11-18
JP2008297042A JP5174628B2 (ja) 2008-11-20 2008-11-20 電力供給装置
JP2008-297042 2008-11-20

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US13/108,339 Continuation US8915840B2 (en) 2008-11-18 2011-05-16 Capsule-type medical device, power supply apparatus, and power supply system

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EP2347698A4 (fr) 2013-10-16
CN102215733B (zh) 2014-06-18
US20110218402A1 (en) 2011-09-08
CN102215733A (zh) 2011-10-12
EP2347698A1 (fr) 2011-07-27
US8915840B2 (en) 2014-12-23

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