Endoscope Shape Detection Device Using Segmented Magnetic Field Generation
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Solution Overview
Problem
Existing endoscope shape detection devices using magnetic fields struggle to accurately display the insertion shape of an endoscope within a body cavity, often resulting in incomplete or distorted images due to limitations in magnetic field generation and detection, leading to challenges in precise insertion operations.
Innovation Solution
An endoscope shape detection device comprising magnetic field generation and detection elements, a shape estimation section, property value detection, storage, and state detection to accurately determine the shape of the endoscope insertion part, with a source coil drive circuit and sense coil signal amplification to generate and process magnetic field data for precise three-dimensional imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If magnetic field generation elements and detection elements are used to detect endoscope insertion shape, then the ability to detect insertion shape is improved, but the accuracy and completeness of the displayed image deteriorates due to limitations in magnetic field generation and detection
Solution Approach 1:
The endoscope insertion part is divided into multiple discrete magnetic field generation elements arranged at predetermined intervals. Each element can be independently detected, allowing the system to reconstruct the complete insertion shape by combining individual position data points, thereby improving both detection capability and image completeness
Solution Approach 2:
Magnetic fields serve as an intermediary medium between the endoscope insertion part and the detection system. The magnetic field generation elements create detectable magnetic field patterns that carry information about the insertion shape, enabling non-contact detection while maintaining measurement precision through sophisticated field analysis
2Measurement precision
If multiple magnetic field generation elements are disposed at predetermined intervals in the insertion part, then the detection capability is improved, but the device complexity increases
Solution Approach 1:
Each magnetic field generation element serves multiple functions: it acts as a position marker, a reference point for shape reconstruction, and a component for generating detectable magnetic field patterns. This multi-functionality reduces the need for separate detection mechanisms, thereby improving measurement precision without proportionally increasing device complexity
Solution Approach 2:
The magnetic field generation elements within the insertion part serve as both the object to be detected and the source of detection signals. By generating their own magnetic field signatures, these elements eliminate the need for external active transducers at each measurement point, simplifying the overall device architecture while maintaining high detection accuracy
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
The device provides a precise and complete three-dimensional representation of the endoscope insertion shape, enhancing the accuracy of insertion operations by ensuring the entire shape is displayed within a predetermined region, thus facilitating smoother endoscopic procedures.
Implementation Method 1
driving a plurality of magnetic field generation elements disposed at predetermined intervals in an insertion part of an endoscope to be inserted into inside of a body, thereby generating magnetic fields around the magnetic field generation elements
Implementation Method 2
using magnetic field detection elements disposed outside the body, based on the generated magnetic fields, detecting three-dimensional positions of each of the magnetic field generation elements
Data Source
AI summary
A source coil drive circuit section of an endoscope shape detection device includes, an oscillator that generates a sine wave and an amplifier that amplifies the sine wave and generates (drives) an alternating magnetic field to source coils through a switch section. The switch section is configured to switch a direct current to an output of the amplifier and supply to the source coils. In the source coil drive circuit section, a direct current resistance value detection section for measuring a direct current resistance value of the source coils by voltage drop when the switch section is supplying the direct current to the source coils is provided.