Integrated Phaco Hand Piece Pump for IOP Surge Control
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Solution Overview
Problem
Phacoemulsification procedures face challenges with varying intraocular pressure (IOP) due to changing flow rates and post-occlusion surges caused by blockages, which can lead to eye collapse and lens capsule tears, and existing solutions are complex and require multiple devices.
Innovation Solution
A phacoemulsification hand piece with an integrated pump and valve system that controls both irrigation and aspiration flows, using a sensor to detect pressure changes and adjust pump speed and valve state to maintain stable IOP, and a removable cartridge to minimize occlusion surges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If varying flow rates are used during phacoemulsification, then productivity is improved, but intraocular pressure stability deteriorates
Solution Approach 1:
The system incorporates pressure sensors that continuously monitor intraocular pressure and feed this information back to the control system. The controller automatically adjusts pump speeds and valve states in response to pressure changes, creating a closed-loop control system that maintains stable IOP despite varying flow rates during surgery.
Solution Approach 2:
The system dynamically adjusts pump speeds and valve positions in real-time based on monitored pressure conditions. The controller modulates the aspiration and irrigation pumps, and adjusts aspiration/irrigation valves to actively compensate for pressure fluctuations, transforming a static system into one that adapts to changing surgical conditions.
2Manufacturing precision
If blockage of the aspirating needle occurs, then manufacturing precision is maintained, but harmful factors increase due to post-occlusion surge
Solution Approach 1:
The system performs preliminary detection of occlusion conditions through pressure monitoring before dangerous pressure builds-up occurs. The control system detects changes in aspiration pressure that indicate needle blockage and takes preventive action by adjusting pump speeds and valve states to mitigate the upcoming post-occlusion surge.
Solution Approach 2:
The system applies preliminary counter-actions to offset the harmful effects of potential occlusion surges. When occlusion is detected, the controller reduces pump speeds and adjusts valve positions in advance to counteract the pressure surge that would otherwise occur when the blockage clears, preventing eye collapse and capsule tears.
3Reliability
If complex active irrigation systems are used, then reliability is improved, but device complexity increases
Solution Approach 1:
The system merges the irrigation pump and aspiration pump into a single integrated pump unit, and combines the irrigation valve and aspiration valve into a unified valve system controlled by a single controller. This consolidation maintains the reliability of active irrigation for IOP stabilization while reducing the number of separate components and simplifying the overall device architecture.
Solution Approach 2:
The integrated pump system performs multiple functions - it can operate in irrigation mode, aspiration mode, or combined modes depending on surgical needs. The single pump and valve system replaces what would traditionally require separate irrigation and aspiration devices, reducing device complexity while maintaining the reliability of active fluid management for IOP control.
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 system effectively stabilizes IOP and reduces post-occlusion surges by quickly adjusting fluid flows, eliminating the need for complex active irrigation systems and reducing device complexity, thereby enhancing the safety and consistency of phacoemulsification procedures.
Implementation Method 1
The operative part in a typical hand piece is a centrally located, hollow resonating bar or horn directly attached to a set of piezoelectric crystals. The crystals supply the required ultrasonic vibration needed to drive both the horn and the attached cutting needle during phacoemulsification
Implementation Method 2
The operative part in a typical hand piece is a centrally located, hollow resonating bar or horn directly attached to a set of piezoelectric crystals. The crystals supply the required ultrasonic vibration needed to drive both the horn and the attached cutting needle during phacoemulsification
Data Source
AI summary
A method of irrigating a surgical site and aspirating fluid from the surgical site. The method includes directing a fluid through an aspiration conduit in a phacoemulsification hand piece using a vacuum pressure created from a pump in the hand piece interfacing with the aspiration conduit and directing an irrigation fluid through an irrigation conduit in the hand piece using a pressure created from the pump interfacing with the irrigation conduit. The method also includes increasing an irrigation fluid flow through the irrigation conduit by activating the pump in the hand piece, detecting a pressure associated with a surgical site using a sensor, and controlling intraocular pressure (IOP) by adjusting the pump speed based on the detected pressure.