Implantable Cardiac Pacing Rate Adjustment via Pressure Sensing
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Solution Overview
Problem
Current implantable medical devices (IMDs) do not effectively address atrial volume overload, a potential cause of atrial fibrillation, which can lead to chronic conditions and increased risk of death, as they fail to emulate the Bainbridge reflex that reduces atrial pressure and volume overload.
Innovation Solution
A medical device with a pressure sensor and processor system that monitors cardiac chamber pressure and adjusts pacing therapy to increase heart rate based on pressure measurements, emulating the Bainbridge reflex to reduce atrial volume overload and prevent atrial fibrillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known IMDs are used to monitor electrical activity and deliver electrical therapy, then arrhythmias can be treated and normal sinus rhythm can be restored, but atrial volume overload and stretch-induced atrial fibrillation cannot be effectively addressed
Solution Approach 1:
The IMD is enhanced with multi-functionality by integrating both electrical therapy capabilities (pacing, cardioversion, defibrillation) and pressure sensing capabilities. This allows the single device to address multiple conditions including arrhythmias and atrial volume overload, making it universally applicable to various cardiac pathologies rather than requiring separate devices for different functions.
Solution Approach 2:
A pressure sensor is introduced as an intermediary component that detects cardiac chamber pressure and provides this information to the processor. This intermediary enables the device to sense mechanical aspects of cardiac function (volume overload) in addition to electrical aspects, bridging the gap between electrical therapy and mechanical cardiac function monitoring.
2Object-affected harmful factors
If the Bainbridge reflex is emulated to reduce atrial pressure, then atrial volume overload and stretch-induced atrial fibrillation can be reduced, but this requires additional sensing and control mechanisms beyond conventional IMDs
Solution Approach 1:
The system implements a feedback mechanism where the pressure sensor continuously monitors cardiac chamber pressure, the processor compares measured pressure to threshold values, and the excitation source adjusts pacing rate accordingly. When pressure exceeds the threshold, the device increases pacing rate to enhance atrial emptying and reduce pressure, creating a closed-loop control system that actively manages atrial volume overload.
Solution Approach 2:
The device enables the heart to self-regulate its own pressure levels by emulating the natural Bainbridge reflex. Through automated pressure monitoring and responsive pacing rate adjustment, the system allows the cardiac system to maintain itself within optimal pressure ranges without requiring external intervention, effectively making the device serve the physiological regulatory function.
3Reliability
If pressure monitoring and rate adjustment are implemented, then atrial remodeling can be promoted and arrhythmia risk reduced, but the device requires pressure sensor integration and processor control capabilities
Solution Approach 1:
The patent merges previously separate functions into a single integrated system. The pressure sensor, processor with threshold comparison capability, and excitation source with adjustable pacing rates are combined within one IMD. This integration allows the device to simultaneously perform pressure monitoring, decision-making based on pressure thresholds, and therapeutic pacing delivery, reducing the need for multiple separate devices while providing comprehensive management of atrial volume overload and arrhythmia prevention.
Data Source
AI summary
An implantable medical device includes a pressure input, an excitation source, a detector module, and a processor. The pressure input is configured to be joined to a pressure sensor located proximate to a cardiac chamber of the heart. The pressure input receives pressure measurements representative of a pressure in the cardiac chamber. The excitation source is configured to deliver stimulation pulses to the heart. The detector module communicates with the pressure sensor to receive and compare the pressure measurements to a pressure threshold. The processor instructs the excitation source to deliver the stimulation pulses at a pressure-based rate based on the comparison of the pressure measurements to the pressure threshold.