Medical Device Position Detection Using Opposite Phase Magnetic Field Cancellation
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Solution Overview
Problem
Current position detection systems for medical devices, such as capsule endoscopes, face challenges in achieving high detection accuracy due to the saturation of amplifiers when trying to amplify signals associated with induced magnetic fields, which are overwhelmed by stronger alternating magnetic fields, leading to low amplification of the induced magnetic field signals and reduced position detection accuracy.
Innovation Solution
A position detection apparatus that includes a circuit with an embedded coil, a first magnetic-field generating unit, a magnetic-field detecting unit, and a second magnetic-field generating unit that generates a magnetic field with a phase opposite to the first magnetic field, allowing the cancellation of the combined magnetic field at the detecting unit, enabling higher amplification of the induced magnetic field signals and improved detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the intensity of the alternating magnetic field is increased to improve detection efficiency, then the detection efficiency improves, but the amplifier becomes saturated and the position detection accuracy deteriorates
Solution Approach 1:
The patent extracts and removes the alternating magnetic field component from the detected signal by using a notch filter that specifically targets and eliminates the frequency of the alternating magnetic field. This allows the amplifier to operate at high gain without saturation from the alternating magnetic field, while still detecting the induced magnetic field signals for accurate position detection
Solution Approach 2:
The patent employs feedback mechanisms where the detected signal is processed through filtering and the alternating magnetic field component is continuously identified and removed. The system adjusts the filtering parameters based on the detected alternating magnetic field frequency, enabling dynamic adaptation to maintain detection accuracy while allowing high amplification
2Measurement precision
If high amplification is applied to the induced magnetic field signals to improve position detection accuracy, then the position detection accuracy improves, but the amplifier becomes saturated by the stronger alternating magnetic field signals
Solution Approach 1:
The patent extracts the harmful alternating magnetic field component from the composite signal before amplification by using frequency-selective filtering. This removal prevents amplifier saturation and allows high amplification of the remaining induced magnetic field signals, maintaining both accuracy and reliability
Solution Approach 2:
The patent performs preliminary filtering of the alternating magnetic field component before the amplification stage. By removing the saturating signal component in advance, the system enables high amplification to be applied safely to the induced magnetic field signals without risking amplifier saturation or distortion
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for increased amplification of the induced magnetic field signals, thereby enhancing the position detection accuracy of medical devices by minimizing the combined magnetic field intensity at the detecting unit, allowing for more precise guidance and positioning of medical devices within the body.
Implementation Method 1
a magnetic-field detecting unit for detecting an induced magnetic field generated at the embedded coil by the first magnetic field
Implementation Method 2
a second magnetic-field generating unit for generating a second magnetic field having a phase substantially opposite to the phase of the first magnetic field
Data Source
AI summary
A position detection apparatus and a medical-device-position detection system that have improved position detection accuracy are provided by setting high amplification for the position detection apparatus. The position detection apparatus includes a circuit that has at least one embedded coil (10a) and that is provided inside an object (10) to be detected; a first magnetic-field generating unit (11) for generating a first magnetic field in the region where the embedded coil (10a) is disposed; a magnetic-field detecting unit (5, 12) for detecting an induced magnetic field generated at the embedded coil (10a) by the first magnetic field; and a second magnetic-field generating unit (23) for generating a second magnetic field having a phase substantially opposite to the phase of the first magnetic field.