Drug Delivery State Estimation Using Binary Position Discrimination
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Solution Overview
Problem
Existing drug delivery systems face challenges in accurately and reliably determining the delivery status of disposable and reusable devices, particularly due to variability in user-dependent component movements and sensor signal reproducibility, which affects the evaluation of medication events.
Innovation Solution
A method involving a position sensor to generate a continuous position signal, a position discriminator to create a binary position signal, and a status evaluator to derive the delivery status, using a monitoring unit that includes a power supply and communication means, allowing for real-time status updates and flexible portability across different device types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous position sensor signals are used to track delivery device components, then measurement precision is improved, but data storage requirements and system complexity increase
Solution Approach 1:
The patent segments the continuous position signal into discrete binary states (first position vs. second position) through a position discriminator. This segmentation transforms the complex continuous signal into simple binary information that is easier to process and store, while still providing sufficient precision for determining delivery status.
Solution Approach 2:
The patent extracts only the essential positional information from the continuous sensor signal by discriminating between first and second positions. This extraction process removes unnecessary data while retaining the critical information needed for delivery status determination, reducing both storage requirements and processing complexity.
2Measurement precision
If user-dependent component movements are monitored continuously, then delivery status accuracy is improved, but signal reproducibility deteriorates due to variability
Solution Approach 1:
The patent changes the parameter representation from continuous position values to discrete binary states. By transforming the signal into binary form (first position = 0, second position = 1), the system becomes more robust against variations in user-dependent movements, as the binary discrimination is less sensitive to signal noise and variability.
Solution Approach 2:
The patent implements feedback through the position discriminator that continuously monitors the position sensor signal and adjusts the binary state determination accordingly. This feedback mechanism ensures that despite variability in user movements, the system consistently and reliably determines the correct binary position state based on the actual physical position of the component.
3Ease of operation
If disposable delivery devices are used, then ease of operation is improved, but adaptability to different device types deteriorates
Solution Approach 1:
The patent creates a universal monitoring unit that can be attached to different types of disposable delivery devices. The position discriminator and status evaluator are designed to work with various device configurations (auto-injectors, patch injectors, fixed-dose injectors) by monitoring generic position signals from components that move between first and second positions, making the system adaptable across multiple device types.
Solution Approach 2:
The patent introduces a reusable electronic module as an intermediary between the disposable delivery device and the monitoring system. This intermediary contains the position discriminator and status evaluator, allowing it to interface with different disposable devices while maintaining consistent processing logic, thus bridging the gap between device-specific variations and universal monitoring requirements.
Data Source
AI summary
A flexible and reliable delivery state estimator or evaluator is provided for a drug delivery device. The proposed delivery status estimation architecture includes a position sensor that provides a continuous position sensor signal indicative of a current position of a component of the delivery device movable continuously from a first to a second component position, as well as a position discriminator that redefines the continuous position sensor signal to generate an approximate binary input signal on behalf of a state estimator. The discriminator absorbs any difficulty that may arise from a limited reproducibility or enhanced variability of the original continuous sensor signal, specifically including a user-originated signal spread in a movement of a needle protection sleeve of the delivery device.