Sensing Arrangement for Powered Cutting Device Control
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Solution Overview
Problem
Existing powered surgical handpieces with disposable cutting blades face challenges in fluid management and cost due to the need for sensors or indicators on the blades, which increase costs and limit compatibility with handpieces.
Innovation Solution
A sensor is integrated within the handpiece to detect the position of disposable cutting accessories, allowing for controlled window positioning and speed adjustment of the inner cutting element, eliminating the need for sensors on the blades and optimizing fluid management by monitoring suction pressure and flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors or indicators are mounted on disposable cutting blades to detect position, then blade position detection is achieved, but the cost of disposable blades increases and compatibility with handpieces is limited
Solution Approach 1:
The sensor is extracted from the disposable blade and relocated to the reusable handpiece. The handpiece now contains the sensor that detects the position of the cutting blade, eliminating the need for sensors or indicators on the blade itself. This resolves the contradiction by achieving position detection without adding complexity or cost to the disposable blade.
Solution Approach 2:
An intermediary detection mechanism is introduced where the sensor in the handpiece detects positional information of the blade through the coupling interface. This intermediary approach allows position detection without requiring direct integration of sensors into the blade structure, thereby maintaining blade simplicity while achieving detection functionality.
2Productivity
If the suction window remains open when the cutting blade is stopped, then fluid suction capability is maintained, but fluid management deteriorates due to rapid fluid removal and pressure drops
Solution Approach 1:
The sensor provides feedback on the position of the cutting blade, and this feedback is used by the controller to automatically adjust the suction window position. When the blade stops, the system detects this through the sensor and automatically closes the suction window, preventing rapid fluid removal and pressure drops. This feedback loop resolves the contradiction by maintaining suction capability during operation while ensuring stable fluid management when stopped.
Solution Approach 2:
The suction window is made dynamically controllable based on the operational state of the cutting blade. The window automatically opens during cutting operations to maintain suction capability and closes when the blade stops to prevent fluid management issues. This dynamic adjustment resolves the contradiction between maintaining productivity and ensuring reliability.
3Ease of operation
If the cutting blade speed is not controlled, then operation simplicity is maintained, but cutting performance deteriorates due to non-optimal cutting speeds
Solution Approach 1:
The system provides self-service speed control where the controller automatically adjusts the cutting blade speed based on sensor feedback and pre-programmed optimal parameters. The operator simply needs to activate the cutting function, and the system autonomously optimizes the cutting speed, resolving the contradiction between operational simplicity and cutting performance by eliminating the need for manual speed adjustment while maintaining optimal cutting conditions.
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 enables precise control of the cutting accessory's position and speed, improving fluid management and reducing costs by eliminating the need for sensors on disposable blades, while detecting clogs and maintaining optimal fluid flow rates.
Implementation Method 1
a pressure sensor for monitoring pressure in a suction flow path for a handpiece having a cutting accessory attached thereto
Implementation Method 2
a fluid flow sensor for monitoring fluid flow rate in the suction flow path
Implementation Method 3
A suction arrangement is provided to enable suction of fluid from a surgical site into the inner tube and through the handpiece to a suction device
Data Source
AI summary
Sensing arrangements for a handpiece sense suction pressure or fluid flow within a suction path to determine the position of a movable cutting element relative to a fixed cutting element of a cutting accessory. A controller calculates actual speed of the movable cutting element from measured pressure or measured fluid flow. The cutting elements have openings that, when aligned, form a window. The controller controls power to a motor that drives the cutting element. When the handpiece is deactivated, the controller stops the movable cutting element at a predetermined position to close or partially close the window. The controller controls the cutting speed in view of joint pressure combined with suction pressure, or in view of fluid flow through the suction path, to maintain an optimal fluid flow rate that enhances the cutting action of the cutting accessory. Pressure or flow sensors may detect a clog in the suction path.