Pressure-Sensitive Drug Delivery System with Adaptive Control
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Solution Overview
Problem
Current drug delivery systems face challenges in ensuring precise and complete delivery of medications, particularly due to tissue back pressure issues that can lead to leakage and reduced efficacy, especially with higher injection rates and viscous formulations.
Innovation Solution
A drug delivery system equipped with a pressure sensor and controller that monitors tissue back pressure to determine when delivery is complete and safe to retract the administration member, preventing leakage by ensuring the system operates based on pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher injection rates are used to improve productivity, then drug delivery speed increases, but tissue back pressure increases causing leakage and reduced reliability
Solution Approach 1:
The system incorporates a pressure sensor that continuously monitors tissue back pressure during injection and feeds this information back to the controller. The controller adjusts the injection rate in real-time based on the pressure feedback, reducing the rate when pressure exceeds a threshold to prevent leakage, and resuming normal rate when pressure decreases, thus maintaining both productivity and reliability
Solution Approach 2:
The injection system transitions from a static, fixed-rate delivery mode to a dynamic, adaptive delivery mode. The controller dynamically adjusts the injection rate based on real-time pressure conditions, allowing the system to optimize between speed and accuracy depending on the instantaneous tissue pressure state
2Loss of time
If faster injection is performed to reduce treatment time, then productivity improves, but leakage increases due to excessive tissue back pressure
Solution Approach 1:
The pressure sensor provides real-time feedback on tissue back pressure during injection. When pressure rises above the threshold indicating risk of leakage, the controller automatically reduces the injection rate, preventing drug leakage. This feedback mechanism allows fast injection when conditions permit while preventing leakage when pressure builds up
Solution Approach 2:
The system takes preliminary anti-action by detecting rising tissue back pressure before leakage occurs and preemptively reducing the injection rate. This prevents the harmful effect of leakage rather than correcting it after the fact, maintaining both speed and preventing substance loss
3Reliability
If pressure monitoring and adaptive control are added to ensure reliable delivery, then delivery accuracy improves, but device complexity increases
Solution Approach 1:
The system adds a pressure sensor and controller to create a closed-loop feedback system that monitors tissue back pressure and automatically adjusts injection parameters. This feedback mechanism significantly improves delivery accuracy and reliability by ensuring complete drug delivery even in varying tissue conditions
Solution Approach 2:
The system performs self-service by automatically detecting pressure conditions and adjusting its own operation without external intervention. The controller autonomously modifies injection rate based on pressure sensor feedback, eliminating the need for manual adjustment and reducing operational complexity for the user
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 approach ensures safe, predictable, and accurate drug delivery, minimizing leakage and enhancing the effectiveness of treatments by adapting to varying tissue pressures.
Implementation Method 1
A drug delivery system equipped with a pressure sensor and controller that monitors tissue back pressure to determine when delivery is complete and safe to retract the administration member
Data Source
AI summary
Systems and methods for drug delivery with pressure sensitive control are disclosed. A drug delivery system may include a reservoir filled or fillable with a drug, a drug delivery device coupled to the reservoir to deliver the drug from the reservoir to a patient, a pressure sensor, an output device, and a controller. The controller may be configured to determine if the drug delivery device has completed delivering a dose of the drug to the patient, and if delivery of the dose of the drug is complete, to measure tissue back pressure using the pressure sensor. Subsequently, the controller may be configured to determine if the tissue back pressure is below a first predetermined value, and if so, control the output device at least once and/or control a mechanism to retract an administration member from the patient.