Drug Delivery Pump Power Modulation for Fluid Line Pressure
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Solution Overview
Problem
Wearable medical devices experience fluid line pressure buildup due to tissue resistance and absorption variability, leading to potential leaks, device damage, and contamination risks.
Innovation Solution
A method involving pressure management through power level adjustments and pauses in fluid delivery, using a microcontroller to monitor and control fluid line pressure by altering pump power levels and pausing delivery until conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump delivers fluid at high power level to ensure complete dose delivery, then the delivery speed is improved, but the pressure in the fluid line increases causing potential leaks and device failure
Solution Approach 1:
The pump power level is dynamically adjusted based on real-time pressure feedback. The system transitions from static high-power delivery to dynamic power modulation, reducing power when pressure approaches thresholds and increasing it when pressure normalizes, thereby maintaining both delivery speed and fluid line integrity throughout the infusion process
Solution Approach 2:
A pressure sensor continuously monitors fluid line pressure and provides feedback to the control system. This closed-loop feedback mechanism enables the controller to detect pressure increases and automatically modulate pump power accordingly, preventing leaks while ensuring complete dose delivery through adaptive power adjustment
2Loss of time
If the pump operates continuously at full power to minimize delivery time, then the productivity is improved, but the pressure buildup causes occlusions and device damage
Solution Approach 1:
The pump operates in periodic cycles of high-power delivery followed by low-power or paused intervals. This periodic operation allows pressure to dissipate during low-power phases, preventing occlusions and device damage while maintaining overall delivery efficiency through strategically timed power cycles
Solution Approach 2:
The system incorporates preemptive power reduction when pressure approaches dangerous thresholds, cushioning against the harmful effects of pressure buildup before occlusions or device damage can occur. This anticipatory action prevents damage while minimizing interruptions to the overall delivery timeline
3Speed
If the pump delivers fluid at high flow rate to meet delivery requirements, then the delivery rate is improved, but the tissue resistance causes pressure buildup compromising fluid line integrity
Solution Approach 1:
The pump power is dynamically modulated based on real-time pressure feedback from the fluid line. When pressure increases due to tissue resistance, the system automatically reduces power to maintain safe pressure levels, then increases it when pressure normalizes, thereby maintaining optimal delivery rate while preventing fluid line compromise
Solution Approach 2:
The system changes the operational parameters of the pump (power level, flow rate) in response to pressure conditions. By adjusting these parameters dynamically based on pressure sensor feedback, the system maintains high delivery rates when tissue resistance is low and reduces power when resistance causes dangerous pressure buildup
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
Minimizes delivery time and reduces occlusions by effectively managing pressure, ensuring complete dose delivery and preventing device failure.
Implementation Method 1
a pump configured to deliver the fluid from the reservoir to the fluid line
Implementation Method 2
The pressure within the fluid line may be determined by measuring a current of the drug delivery device during actuation of the pump
Data Source
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AI summary
A method of pressure management for a drug delivery device includes delivering fluid through a fluid line via a pump at a first power level, determining a pressure within the fluid line, determining whether the pressure within the fluid line exceeds a pressure threshold level, pausing the delivery of fluid through the fluid line until a predetermined condition is satisfied, and resuming the delivery of the fluid through the fluid line at a second power level after the predetermined condition is satisfied. The second power level is lower than the first power level.