Click Event Identification in Variable Dose Injection Devices
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Solution Overview
Problem
Existing technologies face challenges in reliably identifying individual clicks in vibration signals from conventional accelerometers in variable-dose injection devices, which requires high sampling frequencies and increased data storage and processing power.
Innovation Solution
A two-stage approach involving peak detection and peak identification is employed, where a first feedback sensor measures a signal peak related to a feedback event, and a second sensor optionally provides additional features for peak identification, allowing for efficient dose determination with reduced resource requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional accelerometers are used to detect vibration signals from feedback events, then dose monitoring can be implemented, but reliable identification of individual clicks requires high sampling frequencies and increased data storage and processing power
Solution Approach 1:
The signal processing is divided into two distinct stages: peak detection stage that identifies potential feedback events, and peak identification stage that classifies them as dial-up, dial-down, or expel events. This segmentation allows each stage to operate with optimized parameters, reducing the overall processing burden while maintaining accuracy.
Solution Approach 2:
The peak detection stage performs preliminary identification of signal peaks that correspond to feedback events before the more complex peak identification stage processes them. This preliminary action filters out non-event signals early, reducing the amount of data that requires intensive processing.
2Reliability
If high sampling frequencies are used to capture vibration signals, then individual clicks can be reliably identified, but data storage requirements and processing power increase
Solution Approach 1:
The system extracts only the critical information needed for dose monitoring - the peaks in the vibration signal that correspond to feedback events. By focusing processing on these extracted peaks rather than continuously analyzing the entire high-frequency signal, the system reduces data storage and processing requirements while maintaining detection reliability.
Solution Approach 2:
The peak detection stage performs preliminary filtering of the high-frequency signal to identify only the peaks that correspond to feedback events. This preliminary action reduces the amount of data that needs to be stored and processed in subsequent stages, maintaining reliability while reducing resource requirements.
3Measurement precision
If multiple sensors are used to provide additional features for peak identification, then dose determination accuracy improves, but device complexity increases
Solution Approach 1:
The processing unit performs multiple functions using a single sensor: it detects peaks in the vibration signal, identifies the type of feedback event (dial-up, dial-down, or expel), and determines the dose. This multi-functionality approach allows accurate dose determination without requiring multiple specialized sensors, thereby reducing device 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
This method enables reliable and efficient determination of expelled or dialed doses in variable-dose injection devices with reduced data storage and processing power requirements, improving the accuracy and cost-effectiveness of dose monitoring.
Implementation Method 1
a first accelerometer adapted to measure, during a dose setting or delivery process, a first signal of the process, the signal comprising a first signal peak related to a feedback event
Implementation Method 2
a first feedback sensor adapted to measure, during a dose setting or delivery process, a first signal of the process comprising a first signal peak related to a feedback event
Implementation Method 3
a second gyroscope adapted to measure, concurrently with the first signal, a second signal of the process comprising a second signal peak related to the feedback event
Data Source
AI summary
Monitoring an injection process executed by a variable dose injection device with feedback means for generating a number of feedback events proportionate to the dose to be determined is disclosed. A dialed or injected dose is determined by measuring a first signal of the process comprising a first signal peak related to a feedback event; detecting the first signal peak in the first signal; selecting an evaluation interval comprising the detected peak and adapted to an expected peak duration; deriving, from the first signal limited to the evaluation interval, a feature or characterizing parameter of the feedback event; identifying, from the derived feature, the feedback event as one of a dial up, dial down, or expel feedback event, and counting identified feedback events to determine the dialed or the ejected dose. The two-stage approach with serially executed peak detection and peak identification allows to optimize data storage and processing power.