Redundant Pneumatic Circuit for Continuous Vitrectomy Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vitrectomy instruments face reliability issues due to the high mechanical stress and heat generated at high speeds, leading to potential failures of pneumatic drive valves, which can cause interruptions in vitreoretinal surgical procedures.
Innovation Solution
A redundant pneumatic circuit is implemented, featuring a primary and backup drive valve system with pressure sensors and a control system that monitors pressure and switches to the backup valve if abnormalities are detected, allowing for continuous operation by adjusting valve duty cycles and providing remediation steps to maintain normal pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pneumatic drive valve is used to power the vitrectomy instrument, then the device complexity is low, but the reliability deteriorates due to potential valve failures from high mechanical stress and heat
Solution Approach 1:
The pneumatic drive system is segmented into two independent subsystems: a primary drive valve (420) and a backup drive valve (430). Each valve operates as a separate functional unit with its own pneumatic circuit path, allowing the system to divide the driving function across multiple components to enhance reliability without requiring complete system redesign
Solution Approach 2:
A backup pneumatic circuit with a standby drive valve is established in advance before any failure occurs. The backup valve remains in standby mode with suppressed pneumatic pressure until needed, providing pre-prepared protection against primary valve failure. This beforehand cushioning ensures continuous operation capability without adding complex real-time switching mechanisms
2Productivity
If pneumatic pressure is continuously supplied to the drive valve at high speed, then the productivity is high, but the reliability deteriorates due to increased mechanical stress and heat generation
Solution Approach 1:
The backup pneumatic circuit with suppressed pneumatic pressure to the backup drive valve provides pre-prepared protection against failure caused by high-speed operation stresses. The isolation valve and circuit selection valves are positioned in advance to enable rapid switching if the primary valve fails under high productivity conditions
Solution Approach 2:
Pressure sensors (460, 470) continuously monitor the pneumatic pressure in real-time, providing feedback to the control system about the actual pressure conditions. This feedback mechanism enables the system to detect abnormalities such as pressure drops or fluctuations that indicate valve degradation or failure, allowing proactive switching to the backup valve before complete failure occurs, thus maintaining reliability during high-productivity operation
Data Source
AI summary
Systems, methods, and computer-readable media for enhancing the reliability of a pneumatically driven surgical tool by providing a redundant, backup pneumatic circuit for supplying the surgical tool with pneumatic pressure at a normal pressure.