Dry Powder Inhaler Vibration Sensing for Reliable Inhalation Data
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Solution Overview
Problem
Existing dry powder inhalers face challenges in monitoring inhalation technique and adherence due to poor performance of monitoring devices, susceptibility to mechanical shocks, signal disturbances, and high costs, leading to unsatisfactory clinical outcomes.
Innovation Solution
A dry powder inhaler with a chamber for housing a capsule, a capsule-piercing mechanism, and a monitoring system comprising an accelerometer, detection unit, and electronic processing unit to generate inhalation data, using mechanical oscillations and airflow measurements to improve monitoring reliability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic sensors are used to monitor inhalation, then monitoring capability is provided, but signal disturbances and interference from ambient noise occur
Solution Approach 1:
The patent replaces acoustic sensors with an accelerometer that measures mechanical oscillations of the inhaler body during inhalation. This substitution eliminates the vulnerability to ambient noise interference that plagues acoustic sensing, as the accelerometer directly measures mechanical motion rather than acoustic pressure waves that can be contaminated by environmental sounds.
Solution Approach 2:
The patent introduces an intermediary transmission path through the inhaler body structure itself. The mechanical oscillations of the inhaler body during inhalation serve as an intermediary carrier that conveys inhalation information to the accelerometer, bypassing the need for direct acoustic sensing and thus avoiding ambient noise interference.
2Reliability
If monitoring devices are added to inhalers, then inhalation monitoring is enabled, but vulnerability to mechanical shocks and external factors increases
Solution Approach 1:
The patent makes the monitoring system self-service by using the inhaler body's own mechanical oscillations during normal inhalation as the signal source. This eliminates the need for separate, vulnerable sensing components that could be damaged by mechanical shocks, as the system leverages the inherent motion of the inhaler itself.
Solution Approach 2:
The patent merges the monitoring function with the existing inhaler body structure. The accelerometer is integrated into the inhaler body, and the monitoring system uses the same mechanical pathway (inhalation-induced oscillations) that the inhaler already experiences during normal operation, thereby avoiding additional vulnerable components.
3Reliability
If complex monitoring systems are implemented, then monitoring capability is enhanced, but cost and device complexity increase
Solution Approach 1:
The patent employs a simple, low-cost accelerometer that can be easily integrated into the inhaler body. Rather than using complex, expensive monitoring systems, the invention uses a straightforward mechanical sensing approach that is both economical and sufficiently reliable for clinical monitoring purposes.
Solution Approach 2:
The patent makes the inhaler body serve multiple functions: it acts as both the delivery device and the sensing structure. The same mechanical oscillations that facilitate powder release during inhalation also serve as the signal source for monitoring, eliminating the need for separate dedicated sensing components and 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 solution provides reliable inhalation data for improved adherence and technique monitoring, reducing signal interference and costs, while maintaining low power consumption and mechanical robustness.
Implementation Method 1
an accelerometer arranged to measure mechanical oscillations determined at least by said agitated motion and by a flow of air through said chamber and/or inhalation channel
Implementation Method 2
said printed circuit board is arranged to transmit the mechanical oscillations from the inhaler body to the accelerometer
Implementation Method 3
said printed circuit board and/or the coupling between said inhaler body and said printed circuit board is arranged to mechanically amplify mechanical oscillations transferred from said inhaler body to said printed circuit board
Data Source
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AI summary
A dry powder inhaler (1) has a chamber (12) for housing a capsule and an inhalation channel (22), the chamber (12) is shaped in order to determine an agitated motion of the capsule in the chamber (12) during an inhalation of a user, the inhaler (1) comprises a capsule-piercing mechanism (30) arranged to pierce a capsule in the chamber (12) and a monitoring system (40) comprising an accelerometer (42) arranged on a printed circuit board (48) in order to measure mechanical oscillations determined at least by the agitated motion and by a flow of air through the chamber (12) and/or inhalation channel (22); a detection unit (44) arranged to detect an activation of the capsule-piercing mechanism (30); and an electronic processing unit (46) configured to receive signals from the detection unit (44) and from the accelerometer (42). Reception of a signal from the detection unit (44) triggers processing of signals from the accelerometer (42) by the electronic processing unit (46) in order to generate inhalation data.