Position detecting system and position detecting method
First Claim
1. A position detecting system comprising:
- a body-insertable apparatus disposed in a state where it is introduced in a subject in a detection space; and
an external apparatus disposed on the outside of the subject,wherein the body-insertable apparatus comprisesan oscillation circuit that outputs an induction signal of a resonance frequency;
a resonance circuit that generates a resonance magnetic field having the resonance frequency in accordance with the induction signal output from the oscillation circuit or a drive magnetic field having the resonance frequency generated in the detection space, and is connected between the oscillation circuit and a ground line; and
a first switch that connects and interrupts the resonance circuit and the oscillation circuit or the ground line,the external apparatus comprisesa drive coil driving unit that outputs a drive signal having the resonance frequency;
a drive coil that generates the drive magnetic field in the detection space in accordance with the drive signal;
a second switch that connects and interrupts the drive coil driving unit and the drive coil;
a magnetic field sensor that detects the resonance magnetic field; and
a position deriving unit that derives position information of the body-insertable apparatus by using information of the resonance magnetic field detected by the magnetic field sensor,the second switch connects the drive coil driving unit and the drive coil when the first switch is in an off state, and disconnects the drive coil driving unit and the drive coil when the first switch is in an on state, andthe resonance circuit generates the resonance magnetic field in accordance with the induction signal or the drive magnetic field.
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Accused Products
Abstract
A system includes a body-insertable apparatus disposed while introduced in a subject in a detection space, and an external apparatus disposed on the outside of the subject. The body-insertable apparatus includes a first switch for connecting/interrupting a resonance circuit and an oscillation circuit or a ground line. The external apparatus includes a drive coil driving unit for outputting a drive signal having the resonance frequency; a drive coil for generating the drive magnetic field in the detection space in accordance with the drive signal; and a second switch for connecting/interrupting the drive coil driving unit and the drive coil. The second switch connects the drive coil driving unit and the drive coil when the first switch is off, and disconnects them when the first switch is on. The resonance circuit generates the resonance magnetic field in accordance with the induction signal or the drive magnetic field.
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Citations
19 Claims
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1. A position detecting system comprising:
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a body-insertable apparatus disposed in a state where it is introduced in a subject in a detection space; and an external apparatus disposed on the outside of the subject, wherein the body-insertable apparatus comprises an oscillation circuit that outputs an induction signal of a resonance frequency; a resonance circuit that generates a resonance magnetic field having the resonance frequency in accordance with the induction signal output from the oscillation circuit or a drive magnetic field having the resonance frequency generated in the detection space, and is connected between the oscillation circuit and a ground line; and a first switch that connects and interrupts the resonance circuit and the oscillation circuit or the ground line, the external apparatus comprises a drive coil driving unit that outputs a drive signal having the resonance frequency; a drive coil that generates the drive magnetic field in the detection space in accordance with the drive signal; a second switch that connects and interrupts the drive coil driving unit and the drive coil; a magnetic field sensor that detects the resonance magnetic field; and a position deriving unit that derives position information of the body-insertable apparatus by using information of the resonance magnetic field detected by the magnetic field sensor, the second switch connects the drive coil driving unit and the drive coil when the first switch is in an off state, and disconnects the drive coil driving unit and the drive coil when the first switch is in an on state, and the resonance circuit generates the resonance magnetic field in accordance with the induction signal or the drive magnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for operating a position detecting system that detects a position in a subject of a body-insertable apparatus including a resonance circuit that generates a resonance magnetic field spontaneously or being induced by an external magnetic field, the position detecting method comprising:
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a resonance magnetic field intensity detecting step of detecting, by a sense coil, intensity of the resonance magnetic field; a resonance magnetic field intensity determining step of determining, by a control unit, whether the magnetic field intensity detected at the resonance magnetic field intensity detecting step is equal to or larger than a predetermined value; an external magnetic field generating step, when the magnetic field intensity is smaller than the predetermined value, of generating, by a drive coil and a drive coil driving unit, the external magnetic field; a resonance magnetic field detecting step of detecting, by a sense coil, a resonance magnetic field spontaneously generated by the resonance circuit or a resonance magnetic field generated by being induced by the external magnetic field generated at the external magnetic field generating step; and a position deriving step of deriving, by a position deriving unit, position information indicative of a position in the subject of the body-insertable apparatus based on the resonance magnetic field detected at the resonance magnetic field detecting step. - View Dependent Claims (19)
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Specification