Ryoji Sato

Bio: Ryoji Sato is an academic researcher from Olympus Corporation. The author has contributed to research in topics: Electromagnetic coil & Magnetic field. The author has an hindex of 14, co-authored 70 publications receiving 581 citations. Previous affiliations of Ryoji Sato include Hitachi.

Position Detection System, Guidance System, Position Detection Method, Medical Device, and Medical Magnetic-Induction and Position-Detection System

Abstract: A position detection system which allows a device to be free from adjustment for position detection and to be made more compact and less expensive includes the device (capsule endoscope 20) having a magnetic induction coil, a drive coil 51 for generating an alternating magnetic field, magnetic sensors 52, a frequency determining section 50B for a position calculating frequency, and a position analyzing unit 50A for calculating, at the position calculating frequency, the position or the orientation or both of the device 20 based on the difference between outputs from the magnetic sensors 52 when only the alternating magnetic field is applied and those when the alternating magnetic field and the induced magnetic field are applied; and a frequency range of the alternating magnetic field or an output frequency range of the magnetic field sensors or both are limited based on the position calculating frequency.

Operating device, monitor device, and capsule guiding system

Abstract: An operating device operates a capsule endoscope with 6 degrees-of-freedom motion by using a magnetic field generator with respect to the capsule endoscope inserted into the subject. The operating device includes an operating unit including a fixed unit and a movable unit, and a force sensor incorporated in the operating unit. The operating unit has a three-dimensional shape substantially identical to the capsule endoscope and is a holdable size. The force sensor detects force information of the movable unit when the movable unit of the operating unit is operated once or continuously. The force information detected by the force sensor is output as instruction information for instructing 6 degrees-of-freedom motion of the capsule endoscope.

Medical device magnetic guidance/position detection system

Abstract: A medical-device magnetic guiding position detecting system that can prevent a decrease in the strength of a position detecting magnetic field in an operating area of a medical device is provided. The medical-device magnetic guiding position detecting system includes a medical device that is disposed in the body of a subject and that includes at least one magnet and a circuit including an internal coil, a first magnetic field generating unit for generating a first magnetic field in the operating area of the medical device, position detecting means for detecting an induction magnetic field induced in the internal coil due to the first magnetic field, and at least one pair of opposing coils for generating a second magnetic field that acts on the at least one magnet. The opposing coils forming each of the at least one pair are independently driven.

Position detecting device, medical device guiding system, position detecting method, and medical device guiding method

Abstract: Provided is a position detecting device including a first magnetic-field generating unit including at least one magnetic-field generating coil and that generates a first magnetic field in a detection space where a detected object provided with a circuit including at least one built-in coil is disposed; a magnetic-field detecting unit having a plurality of detecting coils arrayed to detect an induced magnetic field generated from the built-in coil by the generated first magnetic field; and a second magnetic-field generating unit including at least one magnetic-field generating coil, that generates a second magnetic field, and including a magnetic-field component having a phase substantially opposite to the first magnetic field and entering the detecting coils, wherein the first magnetic-field generating unit and the detecting coils are disposed so that a generating direction of the first magnetic field and a detecting direction of the induced magnetic field intersect each other.

Capsule guiding system

Abstract: A capsule guiding system includes a magnetic guiding unit, a displaying unit, an operation unit, and a control unit. The magnetic guiding unit guides, using magnetic force, a capsule-shaped medical apparatus introduced inside a subject. The displaying unit displays an image of the subject and an image of the capsule-shaped medical apparatus as an overlapped image, and changes relative position and relative direction between the two images as the capsule-shaped medical apparatus is guided by the magnetic guiding unit. The operation unit inputs coordinate information which specifies movement direction of the capsule-shaped medical apparatus. The control unit adjusts coordinate system of the displaying unit and coordinate system of the operation unit to be consistent with each other, transforms the coordinate information input from the operation unit into the coordinate system of the magnetic guiding unit, and controls the guiding of the capsule-shaped medical apparatus based on the transformed coordinate information.

Robotic catheter system

Abstract: A robotic catheter system includes a controller with a master input device. An instrument driver is in communication with the controller and has a guide instrument interface including a plurality of guide instrument drive elements responsive to control signals generated, at least in part, by the master input device. An elongate guide instrument has a base, distal end, and a working lumen, wherein the guide instrument base is operatively coupled to the guide instrument interface. The guide instrument includes a plurality of guide instrument control elements operatively coupled to respective guide drive elements and secured to the distal end of the guide instrument. The guide instrument control elements are axially moveable relative to the guide instrument such that movement of the guide instrument distal end may be controlled by the master input device.

Refrigerating cycle device

Abstract: A refrigerating cycle device using carbon dioxide as refrigerant capable of solving such a problem that when a receiver is installed against a low pressure, a cost and a volume are increased by a pressure resistant design to assure safety, wherein a first pressure reducing device (12) and a second pressure reducing device (15) are operated to vary the refrigerant pressure of a first heat exchanger (13) so as to regulate the refrigerant hold amount of the first heat exchanger, whereby since the unbalance of the amount of refrigerant between cooling and heating/dehumidifying can be reduced, the refrigerating cycle device can be efficiently operated with a downsized receiver or without installing the receiver.

Wireless power transfer system coil arrangements and method of operation

Abstract: This disclosure provides systems, methods and apparatus for wireless power transfer and particularly wireless power transfer to remote systems such as electric vehicles. In one aspect the disclosure provides for an apparatus for wirelessly transmitting power. The apparatus includes a first conductive structure configured to generate a first magnetic field in response to receiving a first time-varying signal from a power source. The apparatus includes a second conductive structure configured to generate a second magnetic field in response to receiving a second time-varying signal from the power source. The first and second structures are positioned to maintain a substantial absence of mutual coupling between the first and second magnetic fields.

Touch screen system and method of driving the same

Abstract: A touch screen system includes a touch screen panel including first lines, second lines crossing the first lines, a plurality of sensing cells formed at the crossing regions between the first lines and the second lines, a driving circuit for sequentially applying a driving signal to the first lines, a first sensing circuit for receiving capacitance change information sensed by the first lines, and generating a first sensing signal corresponding to the capacitance change information, a selecting unit for selectively coupling the first lines to the driving circuit or the first sensing circuit, a second sensing circuit for receiving the capacitance change information sensed by the sensing cells from the second lines and generating a second sensing signal corresponding to the capacitance change information, and a processing unit for receiving a sensing signal from the first sensing circuit and/or the second sensing circuit and determining a detected touch position.