Inhaler Cap Piezoelectric Sensor Kinetic Force Monitoring
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Solution Overview
Problem
Current inhaler devices, particularly pMDI inhalers, face limitations in accurately measuring the kinetic force required to release a drug dose due to 'zero-one counting' and 'no invalid operation' issues, leading to incorrect drug use registration and fragmentation in production due to dedicated caps for different inhalers and drug dispensers.
Innovation Solution
A cap design incorporating a piezoelectric transducer that directly measures the kinetic force applied, allowing continuous force registration and adaptable use across various inhalers and drug dispensers, eliminating the need for separate caps and enabling accurate drug release monitoring and audible signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic buttons with fixed threshold are used to detect drug release, then the device can determine whether drug was released, but it cannot record the exact value of kinetic force applied
Solution Approach 1:
The patent replaces the mechanical electronic button system with a piezoelectric transducer that converts mechanical kinetic force directly into electrical signals. This substitution enables continuous analog measurement of force magnitude rather than discrete threshold detection, achieving precise kinetic force measurement while maintaining relatively simple device architecture through direct transduction.
Solution Approach 2:
The patent changes the detection parameter from binary threshold states (button pressed/not pressed) to continuous analog electrical signals proportional to kinetic force magnitude. The piezoelectric transducer outputs voltage signals that vary continuously with the applied force, enabling precise measurement of the exact kinetic force value rather than merely detecting whether a threshold was exceeded.
2Reliability
If dedicated caps are designed for different inhalers and drug dispensers, then accurate monitoring is achieved, but production becomes fragmented and complex
Solution Approach 1:
The patent designs a universal cap structure with a standardized piezoelectric transducer interface that can be adapted to work with different inhaler and drug dispenser types. The cap's mounting mechanism and sensor interface are designed to accommodate various dispenser configurations, allowing a single cap design to serve multiple device types while maintaining accurate drug use monitoring across all applications.
3Device complexity
If electronic buttons are used with zero-one counting, then device structure is simple, but incorrect drug use cannot be detected
Solution Approach 1:
The patent replaces the mechanical electronic button with a piezoelectric transducer that provides analog output signals. This substitution eliminates the zero-one counting limitation because the piezoelectric sensor generates continuous voltage signals proportional to the kinetic force applied, enabling the system to distinguish between adequate and inadequate pressing forces and thereby detect incorrect drug use.
Solution Approach 2:
The patent implements feedback by comparing the measured kinetic force signal against predefined threshold values. The microprocessor evaluates whether the applied force meets the minimum requirement for proper drug release, providing feedback that indicates correct or incorrect usage. This feedback mechanism enables reliable detection of improper drug administration while maintaining a relatively simple detection system.
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 accurately records the kinetic force applied to the inhaler, preventing incorrect drug use and enabling adaptability across different inhaler models, reducing production complexity and costs while ensuring precise drug administration monitoring and signaling.
Implementation Method 1
the element detecting the kinetic force of the pressure is a piezoelectric transducer
Data Source
AI summary
A device for monitoring drug use from a drug dispenser in the form of a dispenser cap, especially an inhaler, comprising a sensor for measuring drug release from the dispenser. As a drug release measurement sensor (2) a piezoelectric transducer (2) is used, while a piezoelectric transducer (2) is connected to a microprocessor. The cap includes the activator (1) of the drug release measurement sensor (2) associated movably connected with the piezoelectric transducer (2), wherein the piezoelectric transducer (2) is located in the cap in such a way that, with the help of the activator (1) of the drug release measurement sensor (2), after using the drug dispenser, the force pressure on the cap as a kinetic force is transmitted from the activator (1) of the drug release measurement sensor (2) directly to the piezoelectric transducer (2), which measures the transferred kinetic force.