Fluid Management Console Boost Control for Smooth Flush Flow
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Solution Overview
Problem
Existing fluid management systems in flexible ureteroscopy and endoscopic procedures face challenges in achieving responsive and smooth fluid flow while maintaining optimal pressure and flowrate, particularly when dealing with compliance in the fluid pathway, which can compromise responsiveness.
Innovation Solution
A fluid management system with a controller that operates the inflow pump in boost, reverse, and flush modes to dynamically adjust flowrate and pressure based on resistance parameters, using a fluid cassette with a damping chamber to smooth fluid flow and a fluid warming system to maintain optimal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the inflow pump operates at high speed to increase flowrate responsiveness, then the responsiveness to resistance changes improves, but the fluid flow becomes unstable and less smooth
Solution Approach 1:
The system performs preliminary action by pre-filling the compliance section with fluid before the procedure starts and maintaining it at a predetermined pressure. This preliminary preparation ensures that when resistance changes occur during the procedure, the pump can respond quickly without causing flow instability, as the compliance section is already primed and pressurized.
Solution Approach 2:
The system uses feedback by continuously monitoring pressure within the compliance section and adjusting pump operation accordingly. The controller maintains pressure within a predetermined range by detecting pressure changes and modifying pump speed, thereby achieving both responsiveness to resistance changes and stability of fluid flow through closed-loop control.
2Speed
If the pump rapidly increases flowrate in response to resistance changes, then the responsiveness improves, but pressure fluctuations increase causing harmful effects
Solution Approach 1:
The compliance section is pre-filled with fluid before the procedure to create a pressure buffer. This preliminary action allows the system to absorb rapid flowrate changes without transmitting harmful pressure fluctuations to the patient, as the compliant section acts as a shock absorber that dampens pressure spikes.
Solution Approach 2:
The system implements beforehand cushioning by maintaining a predetermined pressure within the compliance section using the compliant section design. This pre-established pressure buffer cushions against rapid flowrate adjustments, preventing harmful pressure fluctuations from reaching the patient while still allowing responsive flowrate changes at the pump.
3Stability of the object's composition
If a compliant section is added to smooth fluid flow, then the fluid delivery smoothness improves, but the system responsiveness to resistance changes deteriorates
Solution Approach 1:
The system performs preliminary action by pre-filling the compliant section with fluid before the procedure and maintaining it at a predetermined pressure. This preliminary preparation ensures the compliant section is ready to smooth flow without compromising responsiveness, as the pre-pressurized fluid column can still transmit pressure changes quickly to signal resistance variations to the controller.
Solution Approach 2:
The system uses feedback by monitoring pressure changes within the compliant section and using these signals to adjust pump operation. The compliant section provides smooth flow delivery while still transmitting pressure feedback to the controller, which then adjusts pump speed to maintain responsiveness to resistance changes through closed-loop control.
4Measurement precision
If the pump operates at variable speeds to maintain optimal pressure, then the pressure control accuracy improves, but the system complexity increases
Solution Approach 1:
The system uses feedback by continuously monitoring pressure within the compliance section and adjusting pump speed accordingly. The controller maintains pressure within a predetermined range by detecting pressure changes and modifying pump operation in real-time, achieving accurate pressure control through closed-loop feedback control.
Solution Approach 2:
The system implements parameter changes by dynamically adjusting pump speed based on monitored pressure conditions. The controller varies operational parameters (pump speed) in response to pressure feedback, enabling accurate pressure control through adaptive parameter modification rather than fixed-speed operation.
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 ensures responsive and smooth fluid delivery, maintaining optimal pressure and flowrate during procedures, enhancing image quality and safety by reducing compliance-related responsiveness issues.
Implementation Method 1
a peristaltic pump to deliver fluid from a reservoir at a fixed pressure or flowrate
Implementation Method 2
compliance in the fluid pathway, which can compromise responsiveness
Data Source
AI summary
A fluid management system including a fluid management console and a fluid cassette configured to be received within the fluid management console. The fluid management console may comprise a housing, a controller housed within the housing, an inflow pump including a motor disposed within the housing, the inflow pump configured to provide fluid at a first setpoint, and a user input interface. The fluid cassette may be configured to provide a flow of fluid to a medical device. In response to a request to provide fluid in a flush mode at a second setpoint greater than the first setpoint, the controller of the fluid management console may be configured to operate the motor in a boost mode prior to reducing a motor speed to a flush mode speed.