Leadless Pacemaker Timing via Pressure Sensors
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Solution Overview
Problem
Current implantable medical devices, such as pacemakers and defibrillators, often require leads to be surgically implanted in the heart, which can be invasive and may not effectively synchronize the pacing of both atrial and ventricular chambers, leading to inefficiencies in heart function.
Innovation Solution
A leadless cardiac pacemaker (LCP) is designed to be implanted within a ventricle, equipped with electrodes, a controller, and sensors like pressure and accelerometer sensors, which determine optimal pacing times based on various cardiac signals to deliver pacing pulses efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If leads are used to connect pacemaker to heart chambers, then electrical stimulation can be delivered to multiple chambers, but the surgical implantation becomes more invasive and complex
Solution Approach 1:
The patent divides the pacemaker system into multiple independent leadless devices, each implanted in a separate heart chamber. Instead of one complex leaded pacemaker, multiple simple leadless units work together to achieve multi-chamber pacing functionality, reducing surgical complexity while maintaining reliability
Solution Approach 2:
The patent uses magnetic coupling as an intermediary mechanism for wireless communication and power transfer between external programming devices and the implanted leadless pacemakers, eliminating the need for invasive leads while enabling effective control and monitoring of multi-chamber pacing
2Device complexity
If leadless pacemaker is used to reduce surgical invasiveness, then implantation becomes simpler, but precise timing synchronization between chambers becomes more difficult
Solution Approach 1:
The patent incorporates pressure sensors in each leadless pacemaker to detect mechanical cardiac events and provides feedback signals to the controller. This feedback mechanism enables precise timing synchronization between chambers by detecting actual mechanical contraction timing and adjusting pacing intervals accordingly, overcoming the challenge of wireless synchronization
Solution Approach 2:
The patent replaces mechanical electrical connections (leads) with magnetic field-based wireless communication for timing coordination. The accelerometers and pressure sensors detect mechanical cardiac events, and timing information is transmitted wirelessly through magnetic coupling, substituting the mechanical lead system with a field-based communication system that achieves precise synchronization
3Measurement precision
If pressure sensors and accelerometers are added to detect cardiac mechanical events, then pacing timing precision is improved, but device power consumption increases
Solution Approach 1:
The patent employs periodic sensing and event-driven transmission where pressure sensors and accelerometers continuously monitor cardiac mechanical events, but data transmission to the controller occurs only when significant events are detected. This periodic action reduces unnecessary communication overhead and power consumption while maintaining high detection accuracy for pacing timing
Solution Approach 2:
The patent designs the leadless pacemaker to autonomously process and interpret sensor data locally using onboard algorithms. The device self-determines pacing timing based on detected mechanical events without requiring constant external intervention or high-power wireless communication, reducing overall power consumption while maintaining precise timing control
Data Source
AI summary
A leadless cardiac pacemaker (LCP) is configured to sense cardiac activity and to pace a patient's heart and is disposable within a ventricle of the patient's heart. The LCP may include a housing, a first electrode and a second electrode that are secured relative to the housing and are spaced apart. A controller is disposed within the housing and is operably coupled to the first electrode and the second electrode such that the controller is capable of receiving, via the first electrode and the second electrode, electrical cardiac signals of the heart. The LCP may include a pressure sensor and/or an accelerometer. The controller may determine a pace time for a cardiac cycle based at least in part upon a signal from the pressure sensor.