Implantable Thoracic Fluid Sensor for Heart Failure Diuresis Titration
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Solution Overview
Problem
Current therapies for heart failure patients, particularly diuretic treatments, lack accurate methods for determining optimal dosage and risk of over-diuresis, leading to potential worsening of the patient's condition due to the lack of evidence-based guidance for managing decongestive therapy.
Innovation Solution
The development of systems and methods that utilize implantable sensors to monitor physiologic parameters such as thoracic fluid, heart sounds, and cardiac pressure to assess the effectiveness of decongestive therapy, determining if a target level of diuresis has been achieved and producing outputs to alert against over-diuresis, non-compliance, or refractoriness, allowing for real-time titration of therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decongestive therapy is intensified to achieve better fluid removal, then diuresis effectiveness is improved, but risk of over-diuresis increases
Solution Approach 1:
The system continuously monitors thoracic fluid status using implantable sensors and provides real-time feedback to adjust decongestive therapy. The sensor data on thoracic fluid volume and pressure is fed back to the therapy delivery system, enabling dynamic adjustment of diuretic dosage to achieve optimal fluid removal without causing over-diuresis.
Solution Approach 2:
The system enables patients to self-monitor their fluid status through portable devices that communicate with implantable sensors. Patients can view their own thoracic fluid measurements and therapy responses, allowing them to participate actively in managing their decongestive therapy and reporting symptoms that may indicate over-diuresis.
2Ease of operation
If traditional clinical assessment methods are used for therapy monitoring, then treatment simplicity is maintained, but measurement precision of fluid status deteriorates
Solution Approach 1:
The system replaces traditional mechanical clinical assessment methods (physical exams, manual measurements) with electronic sensing technology. Implantable sensors continuously measure thoracic fluid volume and pressure, providing objective, precise data that replaces subjective clinical judgment while maintaining ease of use through automated monitoring and remote data transmission.
Solution Approach 2:
The system introduces an intermediary electronic monitoring layer between the patient and clinician. Portable external devices serve as intermediaries that collect sensor data, process information, and transmit it to clinicians, bridging the gap between continuous precise measurement and simplified clinical decision-making.
3Measurement precision
If implantable sensors are deployed for continuous monitoring, then measurement precision of physiologic parameters is improved, but device complexity increases
Solution Approach 1:
The system merges multiple sensing functions into a single implantable device that measures thoracic fluid volume, pressure, and other physiologic parameters simultaneously. By combining these sensors and integrating them with the therapy delivery system, the overall device complexity is reduced compared to using separate monitoring and therapy devices.
Solution Approach 2:
The implantable sensor system is designed to perform multiple functions: monitoring thoracic fluid status, measuring cardiopulmonary parameters, guiding decongestive therapy, and enabling remote patient monitoring. This multi-functionality reduces the need for separate specialized devices, thereby managing complexity while providing comprehensive precision monitoring.
4Reliability
If frequent therapy adjustments are made based on sensor data, then therapy optimization is improved, but loss of time for data collection and analysis increases
Solution Approach 1:
The system performs preliminary data processing and analysis automatically as data is collected from sensors. Thresholds and algorithms are pre-programmed to detect clinically significant changes in thoracic fluid status, enabling rapid therapy adjustments without requiring extensive manual data analysis. The system prepares therapy recommendations in advance based on trending data patterns.
Solution Approach 2:
The system provides continuous automated monitoring and real-time data analysis, eliminating gaps in therapy optimization. The implantable sensors continuously stream data to external devices that process information without interruption, enabling frequent therapy adjustments based on current physiological status rather than periodic assessments.
Data Source
AI summary
Assessing decongestive therapy delivered to a heart failure patient involves use of an implantable sensor configured to sense a physiologic parameter indicative of the patient's diuresis status and a processor coupled to the implantable sensor. The sensor may comprise a thoracic fluid sensor, a heart sounds sensor, a cardiac chamber or arterial pressure sensor, a respiration sensor, or a blood chemistry sensor, for example. The processor is configured to determine if a target level of patient diuresis has been achieved based on a relationship between the sensed physiologic parameter and a threshold developed for the patient, and to produce an output in response to determining that the target level of patient diuresis has been achieved. The processor may be disposed in an implantable housing, in a patient-external housing, or in a network server system.