Drug Delivery Sensor Module With Capacitive Volume Measurement
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Solution Overview
Problem
Existing drug delivery systems face challenges in accurately determining and controlling the amount of fluid substances, such as drugs, delivered to a patient, particularly in systems involving electro-osmatic pumps.
Innovation Solution
A sensor module with a capacitive sensor and actuator system is integrated into the drug delivery system, where the capacitive sensor measures capacitance across a channel to determine the amount of fluid ejected, and an electro-osmatic pump reciprocates the actuator to control the delivery, ensuring precise volume measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitive sensor is used to measure fluid volume, then measurement precision is improved, but device complexity increases due to the need for precise sensor positioning and calibration
Solution Approach 1:
The capacitive sensor is integrated directly into the pump chamber structure, merging the sensing function with the pumping mechanism. This eliminates separate sensor housing and positioning systems, reducing overall device complexity while maintaining measurement precision through the direct coupling of sensor elements with the fluid chamber walls.
Solution Approach 2:
The sensor module utilizes the pump's own mechanical motion and fluid displacement to generate capacitance changes for measurement. The pumping action itself serves as the actuator that creates the measurement signal, eliminating the need for external actuators or complex calibration mechanisms.
2Productivity
If an electro-osmatic pump is used to deliver fluid, then productivity is improved through automated control, but reliability decreases due to sensitivity to fluid composition and temperature variations
Solution Approach 1:
The capacitive sensor provides real-time feedback on fluid volume and pump chamber conditions to the control system. This feedback loop enables dynamic adjustment of pump operation parameters to compensate for temperature and fluid composition variations, maintaining reliable performance while preserving automated delivery capability.
Solution Approach 2:
The system monitors and adjusts operational parameters based on detected fluid conditions. When temperature or fluid composition changes are detected via capacitance measurement, the control system modifies pump timing, duration, and intensity parameters to maintain consistent delivery performance despite environmental variations.
3Ease of operation
If the sensor module is integrated into the pump assembly, then ease of operation is improved through unified control, but device complexity increases due to integration requirements
Solution Approach 1:
The sensor module is merged with the pump assembly as a single integrated unit, where the pump chamber serves as the sensor environment. This integration allows unified control through a single interface while the modular design enables independent replacement of sensor or pump components, actually reducing overall system complexity.
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 provides accurate and controlled delivery of fluid substances by measuring capacitance to determine the amount ejected, enhancing precision and reliability in drug delivery.
Implementation Method 1
the capacitive sensor can be configured to measure a capacitance across the channel. The capacitance across the channel can provide an indication of an amount of the fluid substance ejected via the outlet valve
Implementation Method 2
the pump can include an electroosmotic pump... activation of the pump pushes at least some of the solution from the fluid reservoir into the channel to advance the actuator into the channel
Data Source
AI summary
A sensor module may include a housing comprising a channel extending through a longitudinal axis of the housing. The channel is configured to receive a fluid substance. The sensor module includes an outlet valve in fluid communication with the channel and a capacitive sensor positioned inside the channel. The sensor module can include an actuator at least partially surrounded by the capacitive sensor, and a pump including a fluid reservoir configured to contain a solution. During operation of the sensor module, activation of the pump pushes at least some of the solution from the fluid reservoir into the channel to advance the actuator into the chamber.