Surgical Handpiece Resonant Circuit Switch Detection
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Solution Overview
Problem
Existing systems for detecting handswitches on surgical handpieces are prone to errors due to magnetic field interference and degradation over time, leading to potential operational hazards in the operating room.
Innovation Solution
The use of an active circuit in the surgical handpiece to drive a resonant circuit in the handswitch, which inductively couples a signal back to the handpiece, allowing for reliable detection of the handswitch's presence and position through characteristic parameters such as frequency and amplitude, enhancing safety and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If magnetic sensors (Hall Effect sensor) are used to detect handswitch presence, then the detection system is simple to implement, but the reliability of detection deteriorates due to magnetic field interference from other equipment
Solution Approach 1:
The patent replaces magnetic field-based detection (Hall Effect sensor) with electromagnetic induction-based detection. The handswitch contains a coil that generates an electromagnetic field when activated, and the handpiece detects this field through a detection coil. This substitution eliminates sensitivity to static magnetic fields from other equipment while maintaining simple implementation.
Solution Approach 2:
The system performs preliminary activation of the handswitch coil before actual surgical operation begins. The controller sends an activation signal to the handswitch, which generates an electromagnetic field that is detected by the handpiece. This preliminary action confirms handswitch presence and functionality before critical operations, preventing erroneous operation.
2Ease of manufacture
If magnetic sensors are used for handswitch detection, then the initial setup is simple, but the system becomes prone to degradation and erratic operation over time
Solution Approach 1:
The patent replaces magnetic sensors with electromagnetic induction detection using coils. The handswitch contains an active coil that generates an electromagnetic field, detected by a coil in the handpiece. This active electromagnetic system is less prone to degradation than passive magnetic sensors, as it actively generates a detectable signal rather than relying on stable magnetic field characteristics over time.
3Reliability
If automated detection systems are implemented, then the potential for human error is eliminated, but the system complexity increases
Solution Approach 1:
The system uses the handswitch's own operational state (coil activation) to generate the detection signal. When the surgeon activates the handswitch, the coil generates an electromagnetic field that automatically signals its presence to the controller. This self-service approach eliminates the need for separate detection mechanisms while maintaining simplicity.
Solution Approach 2:
The system implements feedback by having the handswitch actively generate an electromagnetic signal when activated, which is then detected by the handpiece and confirmed to the controller. This closed-loop feedback mechanism automatically confirms proper connection and activation without requiring manual verification, eliminating human error while keeping the system simple.
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 method provides a more reliable and safer detection of handswitch presence and position, reducing the risk of erroneous operation and simplifying control settings, thereby improving the operational reliability of surgical handpieces.
Implementation Method 1
A signal having a characteristic parameter is inductively coupled back to the surgical handpiece
Implementation Method 2
the resonant circuit will inductively couple back a signal at a particular known frequency
Data Source
AI summary
A handpiece and system having a surgical handpiece adapted to perform an operation on a patient, the surgical handpiece having a primary circuit being driven by an applied signal. A controller is operatively coupled to supply operating power to the surgical handpiece. A hand switch is operatively coupled in conjunction with the surgical handpiece to at least partially control an operation of the surgical handpiece. The switch has a secondary resonant circuit receiving the applied signal from the primary circuit and couples a response signal back to the primary circuit. Detection circuitry, operatively coupled to primary circuit, is responsive to a characteristic parameter of the response signal indicative of the presence of the hand switch in proximity of the surgical handpiece.