Vacuum Signal Filtering for Ocular Surgery Pressure Control
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Solution Overview
Problem
During ocular surgery, aggressive depression of the foot pedal can cause rapid material flow from the eye, leading to transient decreases in intraocular pressure, which can be unsafe for the patient as the infusion line struggles to compensate quickly enough.
Innovation Solution
A method and system that filters the vacuum signal to remove frequencies greater than a threshold frequency, such as 10 Hz, and provides a control signal to the vacuum source, allowing for better control of vacuum levels to prevent or reduce transient drops in intraocular pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the foot pedal is aggressively depressed to achieve high vacuum quickly, then material removal efficiency is improved, but transient drops in intraocular pressure occur which can be unsafe for the patient
Solution Approach 1:
The system dynamically adjusts the vacuum level based on real-time feedback from pressure sensors. The vacuum pump controller modifies vacuum output continuously rather than maintaining a fixed high vacuum, allowing adaptive control that prevents transient pressure drops while maintaining effective material removal.
Solution Approach 2:
Pressure sensors monitor the intraocular pressure and provide feedback to the vacuum pump controller. This closed-loop feedback system allows the controller to adjust vacuum levels in real-time, preventing aggressive vacuum changes that would cause unsafe pressure drops while maintaining efficient material removal.
2Productivity
If high vacuum is applied rapidly to remove material quickly, then surgical efficiency is improved, but the infusion line cannot compensate fast enough leading to unsafe pressure changes
Solution Approach 1:
The system preliminarily establishes a balanced relationship between vacuum suction and fluid infusion before aggressive material removal begins. The controller coordinates vacuum application with fluid replacement, ensuring that the infusion line can compensate for material removal in advance, preventing unsafe pressure changes while maintaining surgical efficiency.
Solution Approach 2:
Real-time pressure monitoring provides feedback that enables the controller to coordinate vacuum and infusion rates dynamically. This ensures that fluid replacement keeps pace with material removal, maintaining pressure stability while preserving surgical efficiency.
3Productivity
If the vacuum pump provides high vacuum levels to improve material removal, then productivity is improved, but transient decreases in intraocular pressure occur
Solution Approach 1:
The vacuum pump operates dynamically rather than at fixed high vacuum levels. The controller continuously adjusts vacuum output based on real-time pressure feedback, allowing the system to maintain high material removal rates while preventing dangerous drops in intraocular pressure through adaptive control.
Data Source
AI summary
A method and system assist a physician in controlling pressure in a line during a surgery. The method includes filtering a vacuum signal such that portions of the vacuum signal having a frequency greater than a threshold frequency (e.g., ten Hz) are not passed. Thus a filtered vacuum signal is provided. The method also includes providing a control signal to a vacuum source. The control signal is selected from the vacuum signal and the filtered vacuum signal. The vacuum source provides a vacuum having a level based on the control signal.