Phacoemulsification Hand Piece Aspiration Pump Surge Control
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Solution Overview
Problem
Phacoemulsification devices face challenges in maintaining stable Intra-Ocular Pressure (IOP) due to varying flow rates and post-occlusion surge caused by blockages, which can lead to eye collapse and lens capsule tears.
Innovation Solution
The integration of an aspiration pump close to the needle within the hand piece, combined with a short, rigid length of aspiration line, minimizes pressure fluctuations and eliminates surge by reducing the compliance in the fluid path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a long, compliant aspiration line is used to connect the pump to the needle, then the device is easier to assemble and more flexible, but pressure fluctuations and post-occlusion surge increase causing eye collapse and lens capsule tears
Solution Approach 1:
The aspiration line is segmented into two distinct sections: a short, rigid section near the needle tip and a longer, flexible section connecting to the pump. This segmentation allows the rigid portion to maintain pressure stability and eliminate surge at the critical needle interface, while the flexible portion maintains ease of assembly and positioning without transmitting pressure fluctuations to the eye
Solution Approach 2:
The rigid aspiration line section acts as an intermediary element between the needle and the flexible tubing. It serves as a pressure-stabilizing interface that blocks the transmission of compliance-induced pressure fluctuations from the flexible line to the anterior chamber, thereby preventing post-occlusion surge while maintaining system flexibility
2Device complexity
If the aspiration pump is located far from the needle, then the hand piece structure is simpler, but pressure fluctuations increase causing unstable IOP
Solution Approach 1:
The system is segmented into a compact pump-needle assembly unit and a separate flexible connection to the pump. By placing the pump integral with or very close to the hand piece and using a short rigid aspiration line, the critical pressure-regulating components are concentrated near the surgical site, maintaining IOP stability while the overall system structure remains manageable
3Reliability
If a rigid aspiration line is used, then pressure stability is improved, but the device becomes harder to assemble and less flexible
Solution Approach 1:
The aspiration line is divided into rigid and flexible segments, each performing its specific function. The rigid segment provides pressure stability where needed, while the flexible segment enables easy assembly and positioning, resolving the contradiction between rigidity and flexibility through functional segmentation
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
This configuration stabilizes IOP and prevents post-occlusion surge, ensuring a safer and more efficient phacoemulsification procedure by maintaining consistent pressure and reducing the risk of eye collapse.
Implementation Method 1
The flexible tubing supplies irrigation fluid to the surgical site and draws aspiration fluid from the eye through the hand piece assembly
Implementation Method 2
The crystals supply the required ultrasonic vibration needed to drive both the horn and the attached cutting needle during phacoemulsification
Implementation Method 3
The crystals supply the required ultrasonic vibration needed to drive both the horn and the attached cutting needle
Data Source
AI summary
An ophthalmic surgical hand piece comprises a driver coupled to a horn. The horn is coupled to a needle. An aspiration pump is integral with the hand piece and is located close to the needle. A rigid length of aspiration line is located between the aspiration pump and the needle. An optional pressure sensor is located between the aspiration pump and the needle as well.