Automated Fluid Infusion System Pressure Control via Bleed Screw
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Solution Overview
Problem
Current medical fluid infusion systems lack effective control over fluid delivery pressure, leading to variability in the administration of bio-compatible fluids, which can result in inadequate or excessive fluid delivery, potentially increasing patient morbidity and mortality.
Innovation Solution
An automated medical fluid infusion system that includes an inflatable pressure bag connected to a source of compressed gas via flexible tubing, featuring a pressure venting device with a movable bleed screw and a manometer to maintain consistent pressure, and a rapid inflate device to control gas flow, ensuring uniform pressure application to the IV fluid bag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pressure bag is used to speed up fluid infusion, then fluid delivery speed is improved, but pressure control variability increases leading to inconsistent fluid delivery
Solution Approach 1:
The system incorporates a pressure sensor that continuously monitors the pressure within the pressure bag and provides feedback to a controller. The controller adjusts the compressed gas flow accordingly to maintain pressure within a predetermined range, ensuring consistent fluid delivery while achieving rapid infusion rates.
Solution Approach 2:
The manual pressure bag system is replaced with an automated system that uses compressed gas delivery controlled by electronic components (pressure sensor, controller, and gas flow regulation) to maintain precise pressure control, eliminating the variability inherent in manual systems.
2Device complexity
If manual pressure bag administration is used, then device complexity is reduced, but fluid delivery control precision deteriorates
Solution Approach 1:
A pressure sensor continuously monitors the pressure bag pressure and provides feedback to a controller that automatically adjusts compressed gas flow to maintain pressure within a predetermined range, ensuring precise fluid delivery control.
Solution Approach 2:
The system uses an automated control mechanism where the pressure sensor and controller work together to self-regulate the compressed gas flow, maintaining optimal pressure without requiring manual intervention, thereby achieving precise control while reducing operational complexity.
3Productivity
If compressed gas flow is increased to speed up infusion, then fluid delivery rate improves, but pressure instability increases
Solution Approach 1:
The system dynamically adjusts the compressed gas flow rate based on real-time pressure feedback from the pressure sensor. The controller modulates the gas flow to maintain pressure within a predetermined range, allowing high infusion rates while maintaining pressure stability through continuous adaptation.
Solution Approach 2:
The pressure sensor provides continuous feedback on the pressure bag pressure to the controller, which automatically adjusts the compressed gas flow to maintain pressure within optimal ranges, enabling high infusion rates without pressure instability.
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 consistent and controlled delivery of bio-compatible fluids, maintaining pressure within a prescribed range (200-400 mm Hg), thereby enhancing fluid management and reducing the risk of adverse outcomes.
Implementation Method 1
the pressure gradient is an important factor in determining how quickly fluid can be delivered to the patient
Implementation Method 2
communicating via flexible tubing with a source of compressed gas
Data Source
AI summary
An automated medical fluid infusion system for delivering a bio-compatible fluid to a patient. The bio-compatible fluid is contained in a collapsible IV fluid bag having a deliver port connected by a catheter to the patient. The medical fluid infusion system utilizes an inflatable pressure bag adapted for holding the IV bag and communicating via flexible tubing with a source of compressed gas. A pressure venting device is operatively connected to the flexible tubing and resides between the pressure bag and the source of compressed gas. The pressure venting device includes a housing, a movable bleed screw located within the housing, and a chamfered bleed port. The bleed screw has a tapered end configured to selectively engage the housing at the chamfered bleed port, thereby adjustably opening and closing the bleed port to control the flow of compressed gas through the flexible tubing to the pressure bag.