Multi-Diaphragm Vitrectomy Probe for Compact Cutter Drive
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Solution Overview
Problem
Existing vitrectomy probes face a design limitation due to the size of the diaphragm, which affects the probe's diameter and performance, leading to either reduced precision or increased size, and current solutions compromise either force or cut rate during vitreous humor removal.
Innovation Solution
A multi-diaphragm vitrectomy probe design utilizing two separate diaphragms driven by hydraulic air in opposite directions, allowing for simultaneous cutting support and reducing the probe's diameter without sacrificing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single large diaphragm is used to drive the cutter, then sufficient cutting force and speed can be achieved, but the probe diameter increases beyond acceptable limits
Solution Approach 1:
The single diaphragm is segmented into multiple smaller diaphragms (first diaphragm, second diaphragm, and optionally third diaphragm) arranged in series. Each diaphragm contributes a portion of the total reciprocating force, allowing the probe diameter to be reduced while maintaining sufficient cutting force. The segmented diaphragms are driven by hydraulic air pressure to reciprocate the cutter through the vitreous humor.
2Length of moving object
If the diaphragm size is reduced to decrease probe diameter, then probe precision and control are improved, but the cutting force and performance are dramatically reduced
Solution Approach 1:
Multiple smaller diaphragms are combined in series to collectively generate the required cutting power. The first diaphragm, second diaphragm, and third diaphragm work together to reciprocate the cutter, merging their individual force contributions to achieve the necessary cutting performance while keeping each individual diaphragm small enough to maintain probe precision and control.
3Speed
If a single large diaphragm is used, then cutting speed can be maintained, but the probe becomes too large for precise surgical control
Solution Approach 1:
The diaphragm system is segmented into multiple smaller units that can be arranged in a compact series configuration. This segmentation allows the probe to maintain a small diameter for ease of surgical control while the coordinated action of multiple diaphragms maintains the required cutter reciprocation speed for effective vitreous humor removal.
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 multi-diaphragm design maintains cutting performance and force while reducing the probe's diameter, enhancing control and maneuverability during vitreous humor removal, avoiding damage to delicate eye structures.
Implementation Method 1
Each diaphragm is driven in a first direction and an opposite second direction by hydraulic air that is reciprocatingly delivered to each.
Data Source
AI summary
A diaphragm driven vitrectomy probe employing multiple diaphragms. The probe includes multiple diaphragms providing added areas to which hydraulic air may be delivered in reciprocating a cutter of the probe. Thus, the diaphragms and the probe housing may be reduced in size without sacrifice to force driving cutter reciprocation. Additionally, the amount of force attained and the rate of cutter reciprocation may be increased through the use of multiple diaphragms. Alternatively, the use of added diaphragms may allow for the rate of cutter reciprocation to be maintained even while the air pressure utilized may be reduced.