Surgical End Effector Detection Using Hall-Effect Sensor
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Solution Overview
Problem
Existing electrosurgical instruments face challenges in reliably detecting the presence and type of electrosurgical end effectors, especially when these effectors are rotatably coupled to the surgical instrument handpiece, as the magnetic field detection may fail due to varying orientations and strengths, leading to misidentification or undetection.
Innovation Solution
Incorporating a ring-shaped magnet on the electrosurgical end effector and a hall-effect sensor in the handpiece, which allows for detection of the magnetic field and differentiation of end effector types based on magnetic field strength and position, enabling automatic adjustment of the instrument's mode of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a magnetic field detection system is used to identify end effector presence and type, then the system can automatically recognize and adapt to different end effectors, but the detection reliability deteriorates when end effectors are rotatably coupled due to varying orientations and distances of magnets
Solution Approach 1:
The patent transitions from relying solely on magnetic field strength (one-dimensional detection) to using angular position information (adding a rotational dimension). The hall effect sensor detects both the presence and angular position of the magnet, creating a two-dimensional detection space (strength + angle) that reliably identifies end effector type regardless of rotational orientation.
Solution Approach 2:
The system changes from detecting only magnetic field strength to detecting both magnetic field strength and angular position parameters. By incorporating angular position as an additional parameter, the system can distinguish between different end effector types even when magnetic field strength varies due to rotational position or distance.
2Measurement precision
If the magnet position varies along the rotational axis to identify different end effector functions, then the system can differentiate between multiple end effector types, but the magnetic field strength detected by the sensor varies making detection less reliable
Solution Approach 1:
The patent adds angular position as a second detection dimension to compensate for variations in magnetic field strength caused by different magnet positions along the rotational axis. The combination of strength and angle measurements creates a unique signature for each end effector type, enabling reliable identification despite position variations.
Solution Approach 2:
The detection system uses a composite approach combining two different detection methods (magnetic field strength sensing and angular position sensing) to create a more robust identification system. Neither parameter alone is sufficient, but their combination provides reliable end effector type identification.
3Adaptability or versatility
If multiple different electrosurgical end effectors are used with a single handpiece, then the instrument provides multiple functions, but the system complexity increases to manage detection and identification of each end effector type
Solution Approach 1:
The hall effect sensor serves multiple functions: detecting end effector presence, determining end effector type, and measuring rotational position. This single sensor replaces what would otherwise require multiple separate detection systems, reducing overall system complexity while maintaining versatility.
Solution Approach 2:
The end effector itself provides the identification information through its magnet's position and orientation. The system doesn't require external identification mechanisms or complex coding systems; the physical configuration of the magnet on the end effector naturally encodes the type information, which the sensor automatically reads.
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 solution ensures reliable detection and identification of electrosurgical end effectors regardless of their rotational position, allowing for precise control and modification of the surgical instrument's functions based on the detected type, enhancing operational simplicity and accuracy.
Implementation Method 1
the electrosurgical end effector includes a ring-shaped magnet which may be detected by a hall-effect sensor included in the surgical instrument handpiece
Data Source
AI summary
A surgical instrument including a means for determining the presence of an end effector and determining the type of end effector which is coupled to the surgical instrument handpiece. The end effector includes a ring-shaped magnet, and the handpiece includes a hall-effect sensor for determining the presence and magnitude of the magnetic field produced by the ring-shaped magnet. This allows the end effector to be characterised even where the end effector is rotatably coupled to the handpiece of the surgical instrument.