Implanted Medical Device Vibration Alarm Self-Testing
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Solution Overview
Problem
Implantable medical devices (IMDs) face challenges in reliably notifying patients of medical events due to transducer failures, subjective patient reports, and the inability to objectively assess vibration alarm strength and occurrence, especially in situations where external devices may not function or be practical.
Innovation Solution
The implementation of an alarm testing system using sensors like accelerometers to objectively measure and analyze vibration alarm characteristics, allowing for automated testing and adjustment of alert operations, including the use of backup protocols and compensation mechanisms to ensure effective patient notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibration alarms are used for patient notification, then patient privacy is protected and sensory interference is reduced, but transducer failure risk increases due to moving parts
Solution Approach 1:
The system performs preliminary alarm tests by actuating the vibration alerting means and measuring its characteristics before actual alarm events. This proactive testing detects potential transducer failures before they occur, allowing for preventive maintenance or alternative alerting strategies to be implemented.
Solution Approach 2:
The system continuously monitors vibration alerting characteristics through sensors and compares them against expected ranges. When deviations indicate potential failure, the system provides feedback to adjust alerting operations, such as increasing vibration intensity or switching to alternative alerting methods, thereby maintaining reliability despite transducer degradation.
2Device complexity
If subjective patient reports are used to assess vibration alarm strength, then device complexity is reduced, but measurement precision deteriorates due to physiological variations
Solution Approach 1:
The IMD performs self-diagnosis by using its own sensors to measure vibration alerting characteristics directly. The device autonomously tests its own alerting means, eliminating the need for external assessment tools or complex patient reporting systems, while maintaining high measurement precision through objective sensor data.
3Reliability
If alarm testing is performed frequently to ensure reliability, then transducer failure detection is improved, but energy consumption increases
Solution Approach 1:
The system performs alarm tests at periodic intervals rather than continuously. The frequency and duration of tests are optimized to detect transducer failures reliably while minimizing energy consumption. Tests may be triggered by specific events such as battery charging cycles or device activation, balancing reliability requirements with energy conservation.
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 solution provides objective and automated testing of alarm signals, ensuring that patients receive reliable notifications, reducing the risk of transducer failure and subjective interpretation, and enabling accurate assessment and adjustment of alarm characteristics.
Implementation Method 1
alarm testing system using sensors like accelerometers to objectively measure and analyze vibration alarm characteristics
Data Source
AI summary
An implanted device which includes a vibrator having a drive motor and a drive circuit. An accelerometer is connected to the vibrator and senses alarm test data related to the displacement of the vibrator. A power source provides electricity to the implanted device and a processor is configured for bi-directional wireless communication. The processor is configured for receiving a command from an external device for performance of an alarm test and the processor analyzes the alarm test data for generating test results.