Spring-Based Status Sensors with Inductance Amplification
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Solution Overview
Problem
Conventional methods for determining the status of spring-based elements in small-scale devices, such as wearable medicament delivery devices, are unreliable due to interference and noise, and the low inductance range of spring elements makes accurate detection challenging without additional space or complex components.
Innovation Solution
The use of a spring-based status sensor system that includes an amplifier device within the spring's internal space to boost inductance, coupled with a Colpitts oscillator and a low-cost microcontroller, allows for reliable detection of spring status without increasing system complexity or size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional measurement methods are used to detect spring inductance, then the measurement can be performed, but the detection is unreliable and error-prone due to interference and noise
Solution Approach 1:
The patent introduces an intermediary measurement approach by using a bridge circuit configuration with known inductance values to compare against the unknown spring inductance. This intermediary comparison system filters out noise and interference by referencing stable, known values, thereby improving measurement reliability without directly eliminating harmful factors from the measurement path.
Solution Approach 2:
The patent replaces conventional mechanical measurement methods with an electrical measurement system that uses inductance detection. By substituting mechanical approaches with electrical field-based measurement, the system achieves non-contact sensing that is less susceptible to physical interference and noise, improving reliability while maintaining compact form factor.
2Volume of moving object
If spring elements are made smaller for wearable devices, then the device footprint is reduced, but the detectable inductance range becomes too low for meaningful status information
Solution Approach 1:
The patent applies parameter changes by modifying the electrical measurement parameters to match the reduced inductance values of miniaturized springs. By adjusting the measurement frequency, excitation voltage, and bridge circuit component values to correspond to the smaller inductance range, the system maintains measurement precision while accommodating the reduced device footprint of wearable applications.
Solution Approach 2:
The patent implements dynamic measurement adjustments where the measurement system adapts its parameters based on the detected spring state. The system dynamically adjusts measurement frequency and excitation levels to optimize detection across the reduced inductance range, enabling meaningful status detection in compact wearable devices without sacrificing measurement precision.
3Measurement precision
If conventional amplifiers are added to boost electrical signals, then signal strength is increased, but device complexity and size increase
Solution Approach 1:
The patent merges the signal amplification function with the existing bridge circuit measurement system by incorporating active components directly into the measurement pathway. This integration combines multiple functions (measurement and amplification) into a unified circuit, improving signal detection capability while minimizing the increase in device complexity compared to adding separate conventional amplifiers.
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
Enables accurate determination of spring length and operational states in small-scale devices, facilitating effective control of fluid delivery pumps and ensuring patient safety by monitoring and managing device operations.
Implementation Method 1
the inductance of a spring varies in inverse proportion to its length
Implementation Method 2
amplifier device within the spring's internal space to boost inductance
Implementation Method 3
Colpitts oscillator
Data Source
AI summary
Spring-based sensor devices are described. For example, a spring-based sensor system may include at least one spring associated with a mechanical element, the at least one spring operative to change from a first state to a second state based on a configuration of the mechanical element, sensing circuitry configured to determine an electrical property of the at least one spring, the electrical property to have a first value when the at least one spring is in the first state and a second value when the at least one spring is in the second state, and a logic device to determine a status of the mechanical element based on the electrical property. Other embodiments are described.