Ultrasonic Surgery Footswitch Control for Hard Nucleus Fragmentation
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Solution Overview
Problem
Conventional ultrasonic surgery apparatuses face difficulties in increasing fragmentation power for hard crystalline lens nuclei during cataract surgery, requiring cumbersome manual adjustments and resulting in unintended changes in ultrasonic power and pulse-duty ratio.
Innovation Solution
An ultrasonic surgery apparatus with a footswitch that generates output signals based on pedal depression amount or position, combined with a detection unit for clogging conditions, allows for controlled adjustments of ultrasonic power and pulse-duty ratio to enhance fragmentation power during hard nucleus encounters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the ultrasonic power is increased to maximum value through operation panel when hard nucleus is encountered, then the fragmentation power is improved, but the operation becomes troublesome and smooth surgery is difficult to perform
Solution Approach 1:
The system automatically adjusts ultrasonic power and pulse-duty ratio based on clogging detection without requiring manual intervention. The detection unit monitors aspiration pressure, and when clogging is detected, the control unit automatically increases ultrasonic power to maximize fragmentation capability, eliminating the need for assistants to manually reset parameters.
Solution Approach 2:
The detection unit continuously monitors aspiration pressure levels and provides feedback to the control unit. When clogging is detected through pressure changes, the system automatically adjusts ultrasonic parameters in real-time, creating a closed-loop control system that responds to actual surgical conditions without manual input.
2Extent of automation
If the ultrasonic power and pulse-duty ratio are automatically changed according only to aspiration pressure level, then the automation is improved, but the ultrasonic power and pulse-duty ratio happen to change contrary to the surgeon's intention
Solution Approach 1:
The system provides dynamic adjustment of ultrasonic power and pulse-duty ratio based on real-time clogging detection. The control unit can independently adjust these parameters in response to detected clogging conditions, allowing the system to adapt to changing surgical conditions while maintaining surgeon intent through intentional parameter modification.
Solution Approach 2:
The control system separates the automatic response function (handling routine clogging adjustments) from the intentional control function (surgeon's deliberate parameter changes). This segmentation allows automated detection and adjustment mechanisms to operate independently, preserving the surgeon's ability to intentionally modify parameters when needed without interference from automatic systems.
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
Enables surgeons to intentionally increase fragmentation power for hard nuclei, ensuring smooth surgery while maintaining controlled ultrasonic energy usage, reflecting the surgeon's intentions and reducing tissue invasion.
Implementation Method 1
an ultrasonic chip (2a), a vibration inducing unit which induces ultrasonic vibration to the ultrasonic chip (2a)
Implementation Method 2
an aspiration unit which aspirates tissue emulsified by vibration of the ultrasonic chip (2a)
Data Source
AI summary
An ultrasonic surgery apparatus enabling smooth surgery. The ultrasonic apparatus is provided with an ultrasonic chip, a vibration inducing unit which induces ultrasonic vibration to the ultrasonic chip, an aspiration unit which aspirates tissue emulsified by vibration of the ultrasonic chip, a detection unit which detects a clogging condition of the ultrasonic chip, a footswitch, having a pedal, for emitting an output signal which is based on a depression amount or a depression position of the pedal, and a control unit which controls at least one of ultrasonic power and a pulse-duty ratio of the ultrasonic vibration based on the output signal from the footswitch and a detection result obtained by the detection unit.