Flow Valve Position Sensor for Electrosurgical Handpiece
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Solution Overview
Problem
Current arthroscopic shavers lack electronic monitoring of the mechanical flow valve, leading to potential motor overheating and delayed procedures due to inadequate cooling, as well as suboptimal RF performance, since the surgeon is not alerted when the valve is closed when it should be open.
Innovation Solution
A flow valve position sensing circuit using a Hall Effect sensor and magnet to detect the valve's position and alert the user when it is closed, ensuring proper flow and cooling, integrated into the handpiece of a surgical instrument.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical flow valve is used without electronic monitoring, then the device structure remains simple, but the motor may overheat and the procedure may be delayed due to inadequate cooling monitoring
Solution Approach 1:
The patent replaces the purely mechanical flow valve interface with an electronic sensing system. A Hall effect sensor detects the position of a magnet attached to the flow valve lever, converting mechanical position information into electronic signals. This allows the control circuit to monitor valve position and infer cooling status, replacing mechanical monitoring with electronic detection.
Solution Approach 2:
The patent implements feedback by continuously monitoring the flow valve position through the Hall effect sensor and using this information to determine motor cooling status. The system provides feedback to the user about whether the motor is being adequately cooled, enabling the user to adjust the flow valve accordingly to prevent overheating.
2Reliability
If the flow valve is closed to improve RF function performance, then RF performance improves, but the motor may overheat due to insufficient cooling
Solution Approach 1:
The system provides feedback about motor cooling status based on flow valve position detection. When the valve is closed for optimal RF performance, the sensor detects this position and alerts the user to potential motor overheating, allowing the user to make informed decisions about maintaining valve closure versus opening for cooling.
Solution Approach 2:
The patent prepares for potential motor overheating by monitoring flow valve position in advance. The Hall effect sensor continuously tracks valve position, and the control circuit is ready to alert the user before the motor reaches dangerous temperatures, allowing preventive action to be taken.
3Productivity
If the surgeon is not alerted when the valve is closed, then the operation proceeds without interruptions, but the motor may overheat and require thermal cut-out activation causing procedure delays
Solution Approach 1:
The patent implements real-time feedback to the user about flow valve position and inferred motor cooling status. This allows the surgeon to be immediately alerted when the valve is closed, enabling quick adjustment to maintain both procedure continuity and motor temperature control, preventing thermal cut-out activation and procedure delays.
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 solution allows continuous electronic monitoring of the flow valve's position, preventing motor overheating, ensuring effective cooling, and enhancing RF performance by prompting the user to open the valve when necessary, thus improving surgical efficiency and safety.
Implementation Method 1
The valve position sensing circuit comprises a Hall Effect sensor. The Hall Effect sensor may be arranged to be in a static position relative to the handpiece. The valve position sensing circuit may further comprise a magnet.
Data Source
AI summary
A handpiece for a surgical instrument having a valve position sensing circuit arranged to detect the position of a valve arranged to control the flow of fluid through the suction lumen of the instrument. The distal end of the handpiece is arranged to couple to a cutting accessory. The handpiece comprises: a housing; a suction lumen within the housing extending from the distal end of the handpiece to a proximal end of the handpiece; a valve arranged to control the flow of fluid through the suction lumen; and a valve position sensing circuit arranged to detect a position of the valve. The valve position sensing circuit can be used to alert a surgeon if the valve is closed when it would be preferable for it to be open. For example, if the motor is overheating, the in-joint temperature is too high, or the RF component is activated.