Ventricular Capture Monitoring via Pressure Sensing
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Solution Overview
Problem
Cardiac resynchronization therapy (CRT) devices face challenges in effectively delivering pacing stimuli due to varying capture thresholds, pacing lead migration, and signal processing time, making it difficult to confirm ventricular capture and ensure desired therapeutic benefits.
Innovation Solution
An implantable medical device equipped with a pressure sensor to monitor ventricular pressures, allowing for continuous assessment of myocardial performance index (MPI) and detection of ventricular capture loss, enabling adjustment of electrical stimulation to ensure effective CRT delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pacing stimuli are delivered to ventricles for CRT, then coordinated mechanical contraction and ejection of blood is achieved, but capture confirmation becomes difficult due to varying capture thresholds, lead migration, and signal processing time
Solution Approach 1:
The patent introduces pressure sensors as intermediary devices to indirectly detect ventricular capture. Instead of directly measuring electrical capture thresholds which are difficult to confirm, the system uses pressure changes in the ventricle as a mediator to infer whether capture occurred. The pressure sensor detects pressure changes that occur when the ventricle contracts in response to pacing, providing reliable capture confirmation without directly measuring electrical parameters.
Solution Approach 2:
The patent replaces electrical measurement systems with mechanical pressure sensing. Rather than using electrical sensors to detect capture thresholds and pacing signals, the system uses pressure sensors to detect mechanical pressure changes in the ventricle. This substitution simplifies the measurement process and provides more reliable capture confirmation, as pressure changes are direct consequences of ventricular contraction regardless of electrical threshold variations.
2Productivity
If continuous bi-ventricular pacing therapy is provided, then CRT benefits are delivered, but lead migration or dislodgement may occur affecting capture effectiveness
Solution Approach 1:
The patent implements feedback mechanisms where pressure sensor data is continuously monitored to detect changes in ventricular pressure patterns. When lead migration or dislodgement occurs, the pressure signal characteristics change, allowing the system to detect these abnormalities and provide feedback to alert clinicians or adjust pacing parameters. This continuous feedback enables maintenance of reliable capture effectiveness throughout continuous therapy delivery.
Solution Approach 2:
The system performs preliminary detection of lead migration or dislodgement by monitoring pressure signal changes before they completely lose capture effectiveness. By detecting early signs of lead migration through pressure pattern analysis, the system can alert clinicians to adjust or reposition leads before they cease to function, ensuring continuous effective CRT therapy delivery.
3Measurement precision
If pressure sensors are added to monitor ventricular pressures for capture detection, then continuous monitoring and therapy adjustment capability is improved, but device complexity increases
Solution Approach 1:
The patent makes the pressure sensor system multi-functional by using the same pressure sensing infrastructure for multiple purposes: detecting ventricular capture, monitoring for lead migration, assessing ventricular function, and guiding therapy adjustments. This universal use of pressure sensors eliminates the need for separate dedicated sensors for each function, reducing overall device complexity while maintaining high measurement precision for capture detection.
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
The solution enables continuous monitoring and adjustment of electrical stimulation, improving the effectiveness of CRT by ensuring consistent ventricular capture and optimizing therapy delivery, thereby enhancing cardiac performance.
Implementation Method 1
The lead may include a pressure sensor, such that the device is capable of continuously monitoring the pressure within the ventricle
Data Source
AI summary
In general, this disclosure describes techniques for monitoring ventricular capture of electrical stimulation based upon sensed ventricular pressures using an implantable medical device. One example method comprises obtaining a blood pressure signal for a first ventricle (e.g., right ventricle) of a patient, and determining whether stimulation captured a second, different ventricle (e.g., left ventricle) of the patient based upon the blood pressure signal for the first ventricle. Whether stimulation captured the second ventricle may be determined based on at least one value of a myocardial performance index that is determined based upon the blood pressure signal for the first ventricle. If a loss of capture is identified, the method may further comprise providing a warning signal and/or providing a therapy adjustment signal to adjust the electrical stimulation that is provided to the second ventricle.