Implantable Device Orientation-Based Communication Pulse Control
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Solution Overview
Problem
Wireless communication between implantable medical devices, such as leadless pacemakers, is affected by the orientation of the devices relative to each other, leading to inconsistent synchrony between cardiac chambers.
Innovation Solution
Incorporating an accelerometer to determine the orientation of the devices and adjust communication pulse parameters like amplitude, width, and timing to ensure effective communication, thereby maintaining appropriate synchrony between cardiac chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If implantable medical devices communicate wirelessly without orientation adjustment, then device complexity is reduced, but communication reliability deteriorates due to orientation effects
Solution Approach 1:
The accelerometer determines the orientation of the transmitting device before communication pulses are sent. This preliminary orientation detection allows the system to pre-adjust communication parameters (amplitude, width, timing) based on the detected orientation, ensuring reliable communication from the start rather than attempting correction after communication failures occur.
Solution Approach 2:
The system dynamically adjusts communication pulse parameters (amplitude, width, timing) based on real-time orientation data from the accelerometer. This dynamic adaptation allows the communication system to maintain reliability across varying device orientations without requiring a fixed, complex antenna structure or multiple communication modes.
2Reliability
If communication pulse parameters are adjusted based on accelerometer outputs, then communication reliability improves, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The accelerometer serves multiple functions: it determines both the orientation of the device and provides data for adjusting communication parameters. By making the orientation sensor multi-functional, the system avoids adding dedicated communication control hardware, thereby limiting the increase in device complexity while still achieving improved communication reliability.
Solution Approach 2:
The system changes communication parameters (amplitude, width, timing) based on accelerometer outputs rather than adding complex control hardware. This parameter-based approach leverages existing sensor data to achieve reliable communication, minimizing the need for additional control mechanisms and keeping device complexity manageable.
3Ease of operation
If fixed communication parameters are used, then device complexity is minimized, but communication effectiveness deteriorates in varying orientations
Solution Approach 1:
The system automatically adjusts communication parameters (amplitude, width, timing) based on accelerometer-determined orientation. This automatic parameter adaptation improves communication effectiveness across varying orientations without requiring manual intervention or complex control algorithms, maintaining ease of operation while enhancing performance.
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
Improves the reliability of implant-to-implant communication by ensuring that communication pulses exceed the sense threshold, even in varying orientations, thus enhancing the coordination of pacing and sensing operations between leadless pacemakers.
Implementation Method 1
an accelerometer configured to selectively produce one or more accelerometer outputs indicative of an orientation of the IMD
Data Source
AI summary
Embodiments described herein relate to implantable medical devices (IMDs) and methods for use therewith. Such a method includes using an accelerometer of an IMD (e.g., a leadless pacemaker) to produce one or more accelerometer outputs indicative of the orientation of the IMD. The method can also include the IMD using an accelerometer to identify when the orientation of the IMD is such that the IMD will likely be able to successfully communicate with another IMD via one or more communication pulses sent from the IMD to the other IMD. The method also includes the IMD sending of the one or more communication pulses, that are used to communicate with the other IMD, when the orientation of the IMD is such that the IMD will likely be able to successfully communicate with the other IMD via one or more communication pulses sent from the IMD to the other IMD.