Leadless Dual-Chamber Pacing False Message Mitigation
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Solution Overview
Problem
Implantable medical devices face challenges in accurately distinguishing between true and false messages due to noise interference, leading to inappropriate responses, especially in dual-chamber pacemaker systems where incorrect message detection can result in inappropriate pacing.
Innovation Solution
The method involves measuring message intervals to determine if messages are received within a defined message window, adjusting the window's position based on the interval, and assessing message quality to reject false messages, thereby preventing inappropriate responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If simple messaging and error correction schemes are used to keep power consumption low, then energy efficiency is improved, but false messages may still get through reducing reliability
Solution Approach 1:
The system performs preliminary actions by establishing expected message intervals and creating message windows before messages are received. This allows the device to proactively define acceptance criteria and detect false messages that arrive at unexpected times, resolving the contradiction by maintaining simple processing while improving reliability through pre-established validation rules
Solution Approach 2:
The system uses feedback mechanisms by measuring actual message intervals, comparing them against expected intervals, and adjusting message window positions accordingly. This closed-loop approach allows the simple messaging scheme to adapt to varying conditions while maintaining reliability, as the system learns from incoming messages and refines its acceptance criteria
2Device complexity
If the message window is fixed in position, then device complexity is reduced, but messages may be rejected due to timing variations causing loss of information
Solution Approach 1:
The system applies dynamics by making the message window position adjustable rather than fixed. The window position is dynamically updated based on measured message intervals, allowing the system to adapt to timing variations in incoming messages. This resolves the contradiction by maintaining simple overall device complexity while using dynamic window positioning to prevent valid message rejection
Solution Approach 2:
The system changes parameters by adjusting the message window position based on measured intervals from incoming messages. This parameter adjustment allows the system to accommodate variations in message timing without increasing overall device complexity, thereby preventing the rejection of valid messages while maintaining a relatively simple message window management approach
Data Source
AI summary
Implantable medical devices (IMDs), and methods for use therewith, reduce how often an IMD accepts false messages. Such a method can include receiving a message and measuring a message interval indicative of a length of time between when the message was received and when a preceding message was received. The method can also include determining, based on the measured message interval, whether the message was received within the message window, and determining whether to reject the message based on results thereof. The method can also include adjusting a temporal position of the message window based on the measured message interval. The method can further include determining a quality measure indicative of a quality of the message and/or a quality of a channel over which the message was received, and determining whether to reject the message based on the quality measure.