WO2004089196A1 - 被検体内情報取得装置 - Google Patents
被検体内情報取得装置 Download PDFInfo
- Publication number
- WO2004089196A1 WO2004089196A1 PCT/JP2004/004783 JP2004004783W WO2004089196A1 WO 2004089196 A1 WO2004089196 A1 WO 2004089196A1 JP 2004004783 W JP2004004783 W JP 2004004783W WO 2004089196 A1 WO2004089196 A1 WO 2004089196A1
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- WIPO (PCT)
- Prior art keywords
- power supply
- information acquiring
- vivo information
- acquiring apparatus
- battery
- Prior art date
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Classifications
-
- 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
- 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
- A61B1/00032—Operational features of endoscopes characterised by power management characterised by power supply internally powered
-
- 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
- A61B1/00036—Means for power saving, e.g. sleeping mode
-
- 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
- A61B1/00163—Optical arrangements
-
- 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
- A61B2560/0209—Operational features of power management adapted for power saving
-
- 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
Definitions
- the present invention relates to an in-vivo information acquiring apparatus having a power supply circuit used for an in-vivo information acquiring apparatus such as a capsule endoscope.
- Capsule endoscopes that can be inserted into the body cavity from the mouth and capture information such as the inside of the body cavity by taking pictures of the digestive organs such as the stomach (medical swallowable tablet endoscopes) ) It has been known.
- an illuminating means such as an LED, a solid-state imaging device such as a CCD or a CMOS, and an original unit including a battery for driving the illuminating means and the solid-state imaging device are used.
- a force capsule has been proposed (see Japanese Patent Application Laid-Open No. 2002-520821).
- the capsule endoscope must be small enough to be swallowed on its own by the examiner, and the size of the endoscope is extremely limited due to its intended use. Therefore, a battery mounted as a battery constituting the power supply unit needs to satisfy strict constraints on dimensions in terms of its diameter and height.
- the battery since a stable operation is performed in the capsule endoscope, the battery needs to be capable of stably generating a predetermined voltage.
- buttons batteries used in watches, portable game devices, thermometers, etc. are suitable for their shape and size.
- button batteries there are only a limited number of commercially available button batteries, and any of them can be used in large-capacity endoscopes. It is difficult to construct a power supply circuit that satisfies the current and voltage values required for capsule endoscopes in a compact size.
- An object of the present invention is to generate an output required for a subject / information acquiring device such as a capsule endoscope, and to provide an in-vivo information acquiring device which satisfies the required life of the in-vivo information acquiring device. It is an object of the present invention to provide an in-vivo information acquiring apparatus having a power supply circuit. Another object of the present invention is a test object which can be configured using a commercially available battery, generates an output required for the in-vivo information acquiring device, and satisfies the life required for the in-vivo information acquiring device. It is an object of the present invention to provide an in-vivo information acquiring apparatus having a power supply circuit for an in-vivo information acquiring apparatus.
- Still another object of the present invention is to generate an output required for an in-vivo information acquiring device while satisfying strict restrictions on dimensions required for an in-vivo information acquiring device, and It is an object of the present invention to provide an in-vivo information acquiring apparatus having a power supply circuit for an in-vivo information acquiring apparatus that satisfies the required life of the in-vivo information acquiring apparatus.
- Still another object of the present invention is to configure a commercially available battery and satisfy the strict restrictions on the dimensions required for an in-vivo information acquiring apparatus, while also satisfying the in-vivo information acquiring apparatus. It is an object of the present invention to provide an in-vivo information acquiring apparatus having a power supply circuit for an in-vivo information acquiring apparatus which generates a desired output and satisfies a required life of the in-vivo information acquiring apparatus.
- Still another object of the present invention is to provide an output which is required for an in-vivo information acquiring apparatus, which satisfies the required life of the in-vivo information acquiring apparatus, and which requires a small number of circuit elements to be used.
- An object of the present invention is to provide an in-subject information acquiring apparatus having a power supply circuit for a specimen / information acquiring apparatus. Still another object of the present invention is that it can be configured using a commercially available battery, generates an output required for the in-vivo information acquiring device, and satisfies the life required for the in-vivo information acquiring device.
- An object of the present invention is to provide an in-vivo information acquiring apparatus having a power supply circuit for an in-vivo information acquiring apparatus that requires a small number of circuit elements to be used.
- the present invention provides a function execution unit that executes a predetermined function inside a subject, and a voltage and a current of a desired magnitude having at least one battery.
- the output unit, the output voltage and the output current from the power supply unit, a voltage value of a desired magnitude required to drive the function execution unit, and the function execution unit is driven for a desired time.
- the power supply unit has a plurality of batteries, and the plurality of batteries are connected to output a voltage and a current of a desired magnitude.
- the plurality of batteries included in the power supply unit are connected in parallel with each other.
- the converter is provided with a booster circuit for boosting an output voltage from the power supply to a desired magnitude.
- the booster circuit is a switching regulator type booster circuit.
- the plurality of batteries included in the power supply unit are connected in series with each other.
- the conversion unit includes a step-down circuit that steps down an output voltage from the power supply unit to a desired magnitude.
- the step-down circuit is a switching regulator type step-down circuit.
- the function execution unit obtains predetermined information from a test site inside the subject.
- a wireless unit for wirelessly transmitting an output signal output from the sensor unit to the outside of the subject.
- the sensor means is an image pickup device that picks up an image of a test site inside the subject and generates an image signal.
- the battery is a potane type silver oxide battery.
- a function execution unit that executes a predetermined function in a part of the subject; a power supply unit that has at least two batteries and outputs a desired voltage and current; and an output from the power supply unit. Conversion for converting the voltage and the output current into a voltage value of a desired magnitude required to drive the function execution unit and an average current value capable of driving the function execution unit for a desired time, respectively. And a power supply unit, wherein the power supply unit includes first and second battery units each having at least one battery and outputting a current of a desired value, and the conversion unit includes the function execution unit. And a switch provided between the power supply unit and the power supply unit, wherein one of the first and second battery units is connected to the function execution unit and the other is disconnected for a predetermined time. It is characterized by switching at intervals.
- the present invention provides a power supply unit having a battery whose output current has a value capable of providing a desired life, and a circuit capable of converting an output from the power supply unit to a desired current value.
- a subject information acquisition device having a power supply circuit for an in-subject information acquisition device comprising:
- a current value required for driving the in-vivo information acquiring apparatus can be extracted from the power supply unit for a predetermined time, and for example, a small battery such as a silver oxide button battery can be used. Even when used in an acquisition device, it is possible to prevent the battery life from being exhausted by the time the detection by the in-vivo information acquisition device is completed.
- a well-known silver oxide button battery is cited as a small battery in order to make the effect clear, but it goes without saying that other small batteries may be used.
- small-sized batteries such as silver oxide button batteries, which can output a constant current value to just before their life are relatively small in capacity, cannot draw a large value of current over a long period of time.
- the current value required for driving the in-vivo information acquiring apparatus cannot be extracted for a long time.
- a plurality of batteries are connected in parallel to reduce the output current value per one Oji-Dani silver button battery.
- a desired voltage cannot be obtained.
- a power supply unit that connects a plurality of batteries so that the output current of each battery has a value that can provide the desired life of the battery and that can output a predetermined voltage; And a circuit capable of converting an output from the unit into a desired current / voltage value.
- An in-subject information acquiring apparatus having a power supply circuit for the subject / information acquiring apparatus. " It is suitable.
- the subject / information acquisition device needs to satisfy strict restrictions on dimensions, but it is preferable to use a commercially available battery instead of a custom-made battery due to cost constraints.
- a commercially available battery instead of a custom-made battery due to cost constraints.
- the shape and size of the capsule are suitable for use in a button battery, but the types of commercially available button batteries are limited, and use any of them to obtain in-subject information. It is difficult to configure a power supply circuit for the in-vivo information acquisition device that is large enough to be mounted on the device and that satisfies the current and voltage values required for the in-vivo information acquisition device.
- the present inventor has obtained the following findings as a result of this experiment.
- the current value expected to be used in a commercially available battery and the current value required in an in-vivo information acquisition device differ from each other in prayer.
- the required life of the internal information acquisition device differs by orders of magnitude, and the required current value must be stably extracted during that life. In that sense, a commercially available battery is used.
- silver oxide button batteries for watches have a nominal current capacity (mAh) of life when a standard current of several tens to hundreds of tens of ⁇ A is drawn, while the In order to use it for the internal information acquisition device, it must be kept for more than 8 hours at several mA.
- mAh current capacity
- in order to draw a current larger than the standard current And can only be pulled out to about 50%. Therefore, using an acid silver button battery as it is does not result in a power source that satisfies the current, voltage, and life required for an in-vivo information acquisition device.
- the inventor finds such a new problem by himself, and provides a solution to the problem. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a circuit diagram showing a circuit tested by the inventor of the present invention, which is an embodiment of a power supply circuit used in the in-vivo information acquiring apparatus of the present invention! /, Is a diagram for explaining the problems to be solved.
- FIG. 2 is a graph showing a relationship between an average current value output from a silver oxide button battery and a life obtained by an experiment by the inventor of the present invention in one embodiment of a power supply circuit used in the in-vivo information acquiring apparatus of the present invention.
- FIG. FIG. 3 is a block diagram showing a circuit configuration of a first embodiment of a power supply circuit used in the in-vivo information acquiring apparatus of the present invention.
- FIG. 1 is a circuit diagram showing a circuit tested by the inventor of the present invention, which is an embodiment of a power supply circuit used in the in-vivo information acquiring apparatus of the present invention! /, Is a diagram for explaining the problems to be solved.
- FIG. 2 is a graph showing a relationship between an average
- FIG. 4 is a circuit diagram for explaining the outline of the operation of a step-up type switching regulator which is an example of the step-up circuit of the circuit of the first embodiment of the power supply circuit used in the in-vivo information acquiring apparatus of the present invention. It is.
- FIG. 5 is a circuit diagram for explaining the outline of the operation of a charge pump which is an example of a booster circuit of the circuit of the first embodiment of the power supply circuit used in the in-vivo information acquiring apparatus of the present invention. Yes, FIG. 5 (a) shows a first operation step, and FIG. 5 (b) shows a second operation step.
- FIG. 6 is a diagram illustrating an example of a booster circuit of the power supply circuit used in the in-vivo information acquiring apparatus according to the first embodiment of the present invention.
- FIG. 5 is a timing chart showing a change in voltage.
- FIG. 7 is a block diagram showing a circuit configuration of a second embodiment of a power supply circuit used in the in-vivo information acquiring apparatus of the present invention.
- FIG. 8 is a diagram for explaining an outline of an operation of a step-down switching regulator which is an example of a step-down circuit of a circuit according to a second embodiment of the power supply circuit used in the in-vivo information acquiring apparatus of the present invention.
- FIG. 8 (a) is a circuit diagram of a step-down switching regulator
- FIG. 8 (b) is a timing chart showing a voltage change at each node in FIG. 8 (a). It is.
- FIG. 8 (a) is a circuit diagram of a step-down switching regulator
- FIG. 8 (b) is a timing chart showing a voltage change at each node in FIG. 8 (a). It is.
- FIG. 9 is a diagram illustrating a power supply circuit used in the in-vivo information acquiring apparatus according to the present invention, which is a step-down switching regulator that is an example of a step-down circuit of the circuit according to the second embodiment.
- 9A and 9B are waveform diagrams showing the relationship between the duty ratio of the lip and the potential of the node B.
- FIG. 9A shows a first example
- FIG. 9B shows the second example.
- An example is shown.
- FIG. 10 is a diagram for explaining an outline of an operation of a re-regulator which is an example of a step-down circuit of a circuit according to a second embodiment of the power supply circuit used in the subject / information acquiring apparatus of the present invention.
- FIG. 10 is a diagram for explaining an outline of an operation of a re-regulator which is an example of a step-down circuit of a circuit according to a second embodiment of the power supply circuit used in the subject / information acquiring apparatus of the present invention.
- FIG. 10 (a) is a circuit diagram of a linear regulator
- FIG. 10 (b) is a waveform diagram showing the operation of the transistor and a change in output voltage in FIG. 10 (a).
- FIG. 11 is a block diagram showing a circuit configuration of a third embodiment of a power supply circuit used in the in-vivo information acquiring apparatus of the present invention.
- FIG. 12 shows an experimental result of T on a discharge characteristic of a battery constituting a third embodiment of the power supply circuit used in the in-vivo information acquiring apparatus of the present invention.
- FIG. 12 (a) FIG. 12 (b) shows a measurement pattern
- FIG. 12 (b) shows a discharge characteristic of the measurement pattern.
- FIG. 12 (a) shows a measurement pattern
- FIG. 12 (b) shows a discharge characteristic of the measurement pattern.
- FIG. 13 is a cross-sectional view showing a schematic configuration of an in-vivo information acquiring apparatus to which an embodiment of a power supply circuit used in the in-vivo information acquiring apparatus of the present invention is applied.
- This in-vivo information acquiring apparatus is not limited to a force-push type endoscope, but also includes an H-sensor one-way force sensor, a temperature sensor one-way force, and the like.
- reference numeral 1a is a case, and 1b is a transparent dome joined to the case 1a.
- the case 1a and the transparent dome 1b house an internal harness 2 on which various components are mounted.
- the inner harness 2 has an LED lighting hand A step 3a, a solid-state image pickup device 3b comprising a CCD provided on the image pickup substrate 4 and imaging the area illuminated by the illumination means 3a through the transparent dome 1b, a solid-state image pickup device 3b and the transparent dome 1 b, a power supply board 5 provided with a power supply circuit using a battery 7 as a power supply, and an antenna 6 b provided on a wireless board 6 a for performing wireless communication with the outside.
- VCO 6c is implemented.
- various components including the illumination unit 3a, the solid-state imaging device 3b, the wireless board 6a, and the VC06c correspond to the function execution unit of the present invention.
- the battery 7 corresponds to the power supply unit of the present invention.
- a silver oxide button battery is used as the power supply circuit.
- Silver oxide potato batteries can supply the current necessary for the operation of the in-vivo information acquisition device, and have a flat discharge characteristic with little voltage drop, making them suitable for stable operation of the in-vivo information acquisition device Because it is.
- the nominal voltage of the Sanitan Silver button battery is 1.55V.
- the required voltage and current are 3. IV and several mA, and it is required to operate continuously for 8 hours or more.
- 3. IV by connecting two silver oxide button batteries in series. 3.
- the reason for setting it to IV is to make it the voltage at which IC of CMOS operates.
- the size of the silver oxide button battery can be reduced to 10 mm or less, and the discharge capacity is 5 O because of the mounting on the in-subject information acquisition device.
- the thing of about mA h was used.
- '' ' The nominal (announced by the manufacturer) discharge capacity of the silver oxide potanium battery is about 50 mAh.
- the life of about 600 hours, for example, near the spec or at the spec, can be obtained. It's just a sign of something.
- the published data on the lifetime is only the lifetime when a small current (up to an average of about 0.1 mA at the maximum), which is originally assumed to be used in the silver oxide potato battery, flows.
- the lifetime indicates a current value and a time period originally assumed to be used in the silver oxide button battery. That is, information on the subject No data has been published on the life of a device when a large current flows. This is because both the current value required for the in-vivo information acquisition device and its lifespan are far from those originally expected to be used in the silver oxide pattern battery.
- FIG. 2 shows the relationship between the average current value output from the silver oxide button battery and the life obtained by the experiment of the present inventors.
- a non-linear graph quadrattic curve, inverse proportion
- the average current is 3 mA
- the life is about 9 hours, corresponding to about 27 mAh
- the average current is 3, 5 mA
- the life is nearly 7 hours, and about 24, 5 mAh
- the service life is almost 4 hours, and it corresponds to about 2 OmAh.
- silver oxide button batteries were not limited to SR41W It is known that the pond also has a non-linear graph (quadratic curve, inverse proportion) similar to the graph in Fig. 2.
- the in-vivo information acquiring apparatus of the present embodiment requires a service life of 8 hours or more (long service life).
- the silver oxide button battery (SR) When using 4 1 W), it is necessary to keep the average current flowing per battery below 3.2 mA.
- the required life (8 hours or more) flows per battery based on the characteristics shown in Fig. 2. It is necessary to keep the average current below 3.2 mA.
- the average corresponding to Fig. 2 It is necessary to determine the characteristics that indicate the relationship between the current value and the service life, and to calculate the current value per battery that can withstand the required service life based on the characteristics.
- the present embodiment provides a power supply circuit for an in-vivo information acquiring apparatus that satisfies the following requirements.
- An output with an output voltage of 3. IV and an average current of 5 mA can be obtained from the power supply circuit for the intra-subject information acquisition device.
- batteries are applied to products that carry current within a range that can provide the life indicated by the nominal discharge capacity.
- the product (mAh) of the product of the average current (mA) and the life (h) power The product that operates with the average current corresponding to the range that does not deviate greatly from the nominal discharge capacity (mAh) Then, the batteries are usually used in watches.
- the Sinidani silver button battery is selected.
- the silver oxide button battery is applied to the in-subject information acquisition device as it is (see Fig. 1) ),
- the average current value in the above example, 5 mA
- the average current value is orders of magnitude larger than the average current value of the product that is normally used (in the above example, a wristwatch battery). The reason for this is to obtain the knowledge (see Fig. 2) that the service life cannot be achieved according to the nominal discharge capacity, and to provide a solution to the new problem.
- the range in which the efficiency is good in terms of life is a range in which the average current value is smaller, but the average current required for the in-vivo information acquiring apparatus of the present embodiment is within the range. Power supply circuit for in-vivo information acquisition devices that meets these two requirements at the same time
- FIG. 3 shows a power supply circuit used in the in-vivo information acquiring apparatus of the first embodiment.
- the power supply circuit 10 for the in-vivo information acquiring apparatus includes a power supply unit 20 having four parallel buttons connected in parallel, and a power supply unit 20 connected to the subsequent stage. And a booster circuit 30 as a converter.
- the silver oxide button batteries used for the power supply unit 20 have a smaller capacity than the above SR41W because of the number of batteries used and the current value per unit for longer life, but a smaller SR726 SW (thin battery) was used.
- the discharge capacity (nominal) of the SR 726 SW is 32 mA li and the height is 2.6 mm.
- the diameter of the SR726 SW is 7, 9 mm, similar to the SR41W, and is suitable for mounting on an in-subject information acquiring apparatus. '
- the booster circuit 30 doubles the output voltage from the power supply section 20 to obtain the desired output voltage of 3.IV. Secure.
- the current value output from the booster circuit 30 is 1 Z twice the current value output from the power supply unit 20, so that the desired 5 mA current flows from the power supply circuit 10 Part 20 requires an average current of 1 O mA to flow.
- the booster circuit 30 will be described.
- a switching regulator type booster circuit or a charge pump is used as the booster circuit 30 .
- a switching regulator circuit is one of the power conversion methods for obtaining a stable voltage and current, and high conversion efficiency can be obtained.
- the input power can be supplied to the load or cut off by turning the switch on or off.
- the power to be supplied can be adjusted on average, and the voltage and current can be stabilized.
- a switch and a load are connected in parallel in a step-up type. The change in voltage caused by increasing or decreasing the current flowing through the coil is used. It is configured with a feed pack circuit that keeps the output voltage constant compared to the reference value.
- the switching regulator type booster circuit has a switching FET, a primary delay inductor (L), a charge charging capacitor (C), and a capacitor stored in the capacitor. It has a diode (D) for preventing backflow to prevent charge from leaking when the FET is turned on. However, since a voltage drop of 0.7 V occurs in the diode, the capacitor is not charged unless the diode node reaches 0.7 V or more with respect to the output voltage Vout.
- the power supply that is not stable is Vds
- the switch that turns ON and OFF is a diode.
- the ONZOFF control of the diode is performed by turning the FET switch ON / OFF.
- Vds shorts to GND and current starts to flow to L.
- back electromotive force is generated in the inductor (L).
- Vds becomes high impedance
- the potential of Vds becomes Vin + back electromotive force due to the back electromotive force of the inductor (L). If this is equal to or higher than V out +0.7 V, a current flows through the path (1).
- the power of 1 OmA, 1.55 V output from the power supply section 20 and input from Vin to the switching regulator type booster circuit is 5 mA from Vout power and 3. Output as electric power.
- FIG. 5 is a circuit diagram of the charge pump.
- FIG. 5 (a) shows a first operation step
- FIG. 5 (b) shows a second operation step.
- FIG. 6 is a timing chart showing the operation of the charge pump.
- the switches S1 and S2 are turned on to rapidly charge the capacitor C1.
- the capacitor C1 is charged with the potential VI (1, 55 V).
- the switches S1 and S2 are turned off, and the switches S3 and S4 are turned off.
- FIG. 7 shows a power supply circuit used for the in-vivo information acquiring apparatus of the second embodiment.
- the power supply circuit 40 for the in-vivo information acquisition device includes a power supply section 50 in which four silver oxide button batteries are connected in series, and a step-down circuit connected to the subsequent stage of the power supply section 50. 60 and.
- the silver oxide button battery used for the power supply unit 50 is also SR726 SW as in the first embodiment.
- the step-down circuit 60 reduces the voltage output from the power supply unit 50 by 1 Z twice.
- the configuration is such that the current should flow from the power supply unit 50 twice as large as the desired 5 mA to flow from the power supply circuit 40 (2.5 mA).
- the current value output from the step-down circuit 60 as the conversion unit is twice the current value output from the power supply unit 50, so that the current flowing in the power supply unit 50 is suppressed to 2.5 mA, A longer life is realized.
- the step-down circuit 60 it is necessary to output 6.2 V from the power supply section 50 in order to secure a desired 3.IV as the output voltage from the power supply circuit 40, and therefore, the power supply circuit is connected in series.
- the number of silver oxide button batteries will be four.
- step-down circuit 60 will be described.
- a switching regulator type step-down circuit or a linear regulator is used as the step-down circuit 60.
- the switching regulator type step-down circuit is one of the power conversion methods to obtain a stable voltage and current.
- the step-down type is such that a switch and a load are connected in series.
- a DC-DC converter with low current consumption is used.
- FIG. 8 (a) is a circuit diagram of a switching regulator type step-down circuit
- FIG. 8 (b) is a timing chart showing changes in the potentials of nodes A and B.
- the PWM unit 101 As shown in FIG. 8 (a), the PWM unit 101, it is oscillated at a specific frequency to generate a clock (in FIG FET) transistor with the clock 102 ON / 7 OFF causes.
- the transistor 102 When the transistor 102 is turned on, the potential of the node A becomes Vin, and when it is turned off, the node A becomes high impedance (see FIG. 8 (b)).
- the potential at node A is smoothed by a smoothing circuit (in the figure, it is a low-pass filter of LC, but may be RC) 103, the potential of node B has a point waveform.
- FIG. 9 shows the relationship between the duty ratio of the clock generated by the PWM unit 101 and the potential of the node B.
- Figure 9 (a) shows that when the duty ratio is 50%, the output voltage Vo It is shown that ut (node B) becomes 1Z2 of the input voltage Vi 11 (adopted in the present embodiment).
- FIG. 9 (b) shows that when the duty ratio is, for example, 90%, the output voltage Vo out (node B) becomes 0 and 9 times the input voltage Vi 11. .
- FIG. 10 (a) is a circuit diagram of a linear regulator
- FIG. 10 (b) is a waveform diagram showing an operation of a transistor in a control circuit and a change in an output voltage Vout.
- the control circuit 110 performs contact control between the input voltage V in side node and the output voltage V out side node.
- transistors such as FET are used.
- the decision circuit 111 is composed of an operational amplifier.A reference voltage Vref is applied to its negative-phase input terminal, and a value Vout 'obtained by dividing the output voltage Vout is input to its positive-phase input terminal. You.
- the determination circuit 111 monitors the output voltage Vout, and controls the ONZOFF of the transistor of the control circuit 110 based on the difference between the voltage value Vout 'obtained by dividing the output voltage Vout' and the reference voltage Vref.
- the reference voltage Vref is set to a value corresponding to a desired voltage to be obtained as the output voltage Vout by stepping down the input voltage Vin.
- FIG. 11 shows a power supply circuit used in the in-vivo information acquiring apparatus of the third embodiment.
- the power supply circuit 70 for the in-vivo information acquiring apparatus is provided with two sets 71 in which two silver oxide potato batteries are connected in series. A switch 72 for switching is provided. Construct power supply circuit 70
- the four silver oxide button batteries are SR726 SW as in the first and second embodiments.
- the power supply circuit 70 does not require a booster circuit or a step-down circuit. Therefore, the number of circuit elements to be used can be reduced.
- FIG. 12 shows the results of an experiment on the discharge characteristics of a silver oxide button battery (SR 726 SW) constituting the power supply circuit 70.
- FIG. 12 (a) shows a measurement pattern
- FIG. 12 (b) shows a discharge characteristic of the measurement pattern.
- the measurement pattern is such that two 1.55 V silver oxide button batteries are connected in series. (The measurement pattern corresponds to one set 71 in Fig. 11).
- the discharge characteristic of the silver oxide potane battery (measurement pattern) used in the third embodiment is an average current value of 5 m required by the in-vivo information acquiring apparatus of the present embodiment.
- A will have a lifetime of about 2 hours.
- the two sets 71 are switched and used by the switch 72.
- Switch 72 was switched every 7 to 8 minutes. In that case, the experiment showed that the life was 7 to 8 hours.
- the value is 1.5 to 1.5 times higher than the value obtained when the connection is made in parallel without switching (about 4 hours: the value based on the experimental result in FIG. 12 (b)). It can be seen that the life was extended twice. This is due to the temporary restoration of the capacity by resting the battery by disconnecting by switching.
- a power supply circuit for an in-vivo information acquiring apparatus that satisfies the voltage, current, and life required for the in-vivo information acquiring apparatus of the present embodiment is a commercially available, inexpensive and highly available power supply circuit. It can be provided using a battery. According to the power supply circuit used in the in-vivo information acquiring apparatus of the present invention, an output required for the in-vivo information acquiring apparatus is generated, and a power required for the in-vivo information acquiring apparatus is generated. Life can be fulfilled. It is also possible to use a commercially available battery. Industrial applicability
- the power supply circuit used in the in-vivo information acquiring apparatus according to the present invention is suitable for an in-vivo information acquiring apparatus that consumes relatively large power, such as a compact endoscope. I have.
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- Surgery (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- Biophysics (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Dc-Dc Converters (AREA)
- Endoscopes (AREA)
- Battery Mounting, Suspending (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
Description
Claims
Priority Applications (1)
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JP2005505247A JPWO2004089196A1 (ja) | 2003-04-01 | 2004-04-01 | 被検体内情報取得装置 |
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JP2003-098594 | 2003-04-01 | ||
JP2003098594 | 2003-04-01 |
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WO2004089196A1 true WO2004089196A1 (ja) | 2004-10-21 |
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PCT/JP2004/004783 WO2004089196A1 (ja) | 2003-04-01 | 2004-04-01 | 被検体内情報取得装置 |
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US (2) | US20040236181A1 (ja) |
JP (1) | JPWO2004089196A1 (ja) |
WO (1) | WO2004089196A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010522409A (ja) * | 2007-02-14 | 2010-07-01 | プロテウス バイオメディカル インコーポレイテッド | 大表面積電極を有する体内型電源 |
WO2016098402A1 (ja) * | 2014-12-19 | 2016-06-23 | オリンパス株式会社 | カプセル型内視鏡およびカプセル型内視鏡システム |
Families Citing this family (7)
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WO2006095420A1 (ja) * | 2005-03-09 | 2006-09-14 | Olympus Corporation | 被検体内導入装置および被検体内導入システム |
US20090069630A1 (en) * | 2007-08-30 | 2009-03-12 | Olympus Medical Systems Corp. | Capsule type medical device |
WO2010071075A1 (ja) * | 2008-12-19 | 2010-06-24 | オリンパスメディカルシステムズ株式会社 | 被検体内導入装置 |
US9461546B2 (en) * | 2013-02-08 | 2016-10-04 | Advanced Charging Technologies, LLC | Power device and method for delivering power to electronic devices |
CN105307553B (zh) * | 2013-03-14 | 2018-06-29 | 基文影像公司 | 用于抑制操纵装置期间的电磁干扰的方法和电路 |
WO2015029033A1 (en) | 2013-08-29 | 2015-03-05 | Given Imaging Ltd. | System and method for maneuvering coils power optimization |
TWI676333B (zh) * | 2017-08-21 | 2019-11-01 | 仁寶電腦工業股份有限公司 | 電子裝置及其充電方法 |
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- 2004-04-01 WO PCT/JP2004/004783 patent/WO2004089196A1/ja active Application Filing
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2008
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JPWO2016098402A1 (ja) * | 2014-12-19 | 2017-04-27 | オリンパス株式会社 | カプセル型内視鏡およびカプセル型内視鏡システム |
Also Published As
Publication number | Publication date |
---|---|
JPWO2004089196A1 (ja) | 2006-07-06 |
US20080278970A1 (en) | 2008-11-13 |
US20040236181A1 (en) | 2004-11-25 |
US8041422B2 (en) | 2011-10-18 |
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