Vitrectomy Handpiece Piezoelectric Actuation for High-Flow Cutting
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Solution Overview
Problem
Conventional vitrectomy handpieces are limited by pneumatic chambers that restrict cutting capabilities and flow, leading to incomplete tissue removal and potential ophthalmic complications due to high pressure and restricted flow.
Innovation Solution
A vitrectomy handpiece equipped with a piezoelectric stack assembly that actuates the cutting assembly to achieve precise longitudinal and rotational oscillatory motions, eliminating the need for a spring and enhancing cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pneumatic chamber is used to actuate the inner cutting member, then the cutting action can be achieved, but the cutting capabilities are limited when pressure is too high and flow is restricted
Solution Approach 1:
The patent replaces the pneumatic chamber system with a magnetic field-based actuation system. Magnets are positioned to interact with a ferromagnetic inner cutting member, enabling high-speed oscillatory motion without the pressure and flow restrictions inherent in pneumatic systems. This substitution eliminates the fundamental limitations of pneumatic actuation while achieving the desired cutting effectiveness and productivity.
Solution Approach 2:
The patent changes the actuation mechanism from pneumatic pressure-driven motion to magnetically-driven oscillatory motion. This parameter change allows for higher frequency operation (improved productivity) while maintaining reliable cutting performance (improved reliability) by eliminating the pressure-flow constraints of pneumatic systems.
2Force
If pneumatic pressure is increased to improve cutting action, then cutting force may be improved, but flow through the chamber is restricted and effectiveness is reduced
Solution Approach 1:
The patent substitutes magnetic actuation for pneumatic actuation, eliminating the need for high-pressure gas flow. The magnetic field directly drives the inner cutting member's oscillatory motion, providing sufficient cutting force without restricting flow through any chamber, thereby simultaneously achieving high force and maintaining unrestricted flow.
3Device complexity
If traditional pneumatic chambers are used, then device structure can be simplified, but incomplete tissue removal and ophthalmic complications may occur
Solution Approach 1:
The patent replaces the pneumatic chamber structure with a magnetic actuation system consisting of magnets positioned within the handpiece. This substitution maintains relatively simple device structure while dramatically improving tissue removal completeness by enabling high-frequency oscillatory motion that achieves effective cutting without the limitations of pneumatic systems, thereby preventing ophthalmic complications.
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 piezoelectric stack assembly enables increased cut-rates up to 100,000 cuts per minute, facilitating quicker and more efficient removal of vitreous humor with reduced risk of complications.
Implementation Method 1
a piezoelectric stack assembly coupled to the cutting assembly and configured to actuate the cutting assembly to cut vitreous of an eye
Data Source
AI summary
In certain embodiments, a vitrectomy handpiece is provided. The vitrectomy handpiece includes a cutting assembly and a piezoelectric stack assembly. The piezoelectric stack assembly is coupled to the cutting assembly and is configured to actuate the cutting assembly to cut vitreous of an eye.