Medical Device Positioning Control With Accelerometer Press Verification
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Solution Overview
Problem
Current medical device control systems face challenges in accurately distinguishing between intentional and accidental activations due to the complexity of filtering various force applications, leading to potential false signal evaluations, which can be critical in hospital environments where unintended movements may cause safety risks.
Innovation Solution
A medical device positioning system incorporating a push-button controller with an actuator and a verification system that includes a calculation module and a mechanically connected accelerometer, which evaluates the waveform of mechanical impacts to ensure accurate signal generation and prevent accidental activations, utilizing a microswitch or membrane keypad and a foot-operated controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If filtering tools are used to evaluate accelerometer data for a wide range of forces, then the system can detect various tap intensities, but the complexity of configuring filtering increases and may lead to incorrect signal evaluation
Solution Approach 1:
The patent changes the parameter being measured from force magnitude to acceleration waveform characteristics. By focusing on the temporal and spectral characteristics of acceleration signals rather than filtering across a wide range of force magnitudes, the system achieves versatile detection without complex filtering configuration.
Solution Approach 2:
The patent replaces mechanical force sensing with accelerometer-based motion sensing. This substitution allows the system to detect button presses through the mechanical impact waveform rather than direct force measurement, simplifying the detection mechanism while maintaining accuracy across different press intensities.
2Measurement precision
If filtering tools are used to evaluate accelerometer data, then various forces can be detected, but random signals may be evaluated as relevant or relevant signals filtered out
Solution Approach 1:
The system uses feedback by comparing the detected acceleration waveform against expected button press waveforms. The calculation module continuously monitors acceleration patterns and uses this feedback to verify whether a detected signal corresponds to an intentional button press, reducing false positives while maintaining sensitivity to legitimate presses.
Solution Approach 2:
The patent applies preliminary action by pre-defining the characteristic waveform pattern of a valid button press in the calculation module. Before evaluating any accelerometer signal, the system has the reference waveform ready, allowing it to quickly compare and validate detected signals against this predetermined pattern, thus avoiding false evaluations.
3Reliability
If a dual protection system with two independent contacts is used, then safety against accidental activation is improved, but the system cannot evaluate whether a signal is intentional or accidental
Solution Approach 1:
The patent introduces an intermediary - the accelerometer - between the button press and the control system. This intermediary captures the mechanical impact waveform that provides information about the nature of the press (intentional vs accidental). The calculation module then processes this intermediary data to distinguish between deliberate user actions and accidental activations.
Solution Approach 2:
The system segments the button press detection into two independent evaluation streams: the electrical signal from the switching element and the mechanical impact waveform from the accelerometer. By separating these evaluation paths and then cross-referencing them, the system can determine whether both conditions (electrical signal presence and valid impact waveform) are met, providing both protection and information about signal intent.
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 system enhances safety by accurately differentiating between intentional and accidental presses, reducing the risk of false signal evaluations and ensuring safe operation of medical devices with movable parts.
Implementation Method 1
The verification system contains a calculation module and an accelerometer mechanically connected to the controller. The mechanical impact detected by an accelerometer, which then generates an electrical signal
Data Source
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AI summary
The subject of the invention is a medical device positioning system intended to increase resistance to accidental activation. This is accomplished using two independent systems to configure the actuator in the given position.