Leadless Pacemaker Pressure-Volume Loop Monitoring
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Solution Overview
Problem
Current implantable cardiac pacemakers often require leads to be implanted in the heart, which can be invasive and may not effectively monitor cardiac activity and provide therapy for irregular heart contractions, especially in cases where multiple devices are needed to coordinate treatment.
Innovation Solution
A leadless cardiac pacemaker (LCP) with a housing, electrodes, and a pressure sensor that measures impedance and pressure data during cardiac cycles, transmitting this data wirelessly to a remote device to generate and display pressure-volume loops, allowing for more efficient monitoring and therapy coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pacemakers use implanted leads to monitor cardiac activity and provide therapy, then therapy delivery capability is improved, but invasiveness increases and device coordination becomes complex
Solution Approach 1:
The patent extracts the lead component from the traditional pacemaker system, achieving leadless therapy delivery by implanting a self-contained pacemaker device directly into the heart chamber. This eliminates the invasive lead while maintaining therapy delivery capability through the housing and electrode assembly that functions independently without external lead connections.
Solution Approach 2:
The pacemaker housing serves multiple functions simultaneously: it provides structural support, contains the control circuitry, houses the pressure sensor, and acts as the interface for both sensing and therapy delivery. This multi-functionality eliminates the need for separate lead components, reducing invasiveness while maintaining comprehensive cardiac monitoring and therapy capabilities.
2Reliability
If multiple implanted devices are used to coordinate heart monitoring and therapy, then treatment effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent merges sensing, monitoring, and therapy delivery functions into a single integrated pacemaker device. The housing contains all necessary components including electrodes for sensing and therapy, a pressure sensor for hemodynamic monitoring, and control circuitry that coordinates all functions. This consolidation achieves treatment effectiveness without requiring multiple separate devices or complex coordination between them.
Solution Approach 2:
The single pacemaker device performs multiple functions: it senses cardiac electrical activity through electrodes, monitors pressure through the pressure sensor, and delivers therapy through the same electrodes. This universal design eliminates the need for multiple specialized devices, reducing overall system complexity while maintaining comprehensive treatment capability.
3Measurement precision
If pressure sensor and impedance measurement are integrated into the pacemaker, then cardiac function monitoring is improved, but device complexity increases
Solution Approach 1:
The patent combines the pressure sensor, impedance measurement circuitry, and cardiac monitoring functions into a single integrated device. The pressure sensor is housed within the pacemaker structure, and the impedance measurement is performed using the existing electrodes, eliminating the need for separate monitoring devices and reducing overall system complexity while improving measurement precision.
Solution Approach 2:
The pacemaker device serves as a universal monitoring and therapy platform by integrating pressure sensing, impedance measurement, and cardiac rhythm monitoring capabilities. This multi-functional approach allows comprehensive cardiac function assessment within a single device, improving measurement precision without requiring multiple separate monitoring systems.
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 LCP provides effective monitoring and therapy coordination without the need for invasive leads, enabling better management of cardiac arrhythmias and improved heart function through remote data transmission and analysis.
Implementation Method 1
a pressure sensor secured relative to the housing and is coupled to the environment outside of the housing
Implementation Method 2
the circuitry configured to determine, at a first time during a cardiac cycle, a first impedance between the first electrode and the second electrode
Data Source
AI summary
A leadless cardiac pacemaker (LCP) configured to sense cardiac activity and to pace a patient's heart. The LCP may include a housing, a first electrode secured relative to the housing, a second electrode secured relative to the housing, and a pressure sensor secured relative to the housing and coupled to the environment outside of the housing. The LCP may further include circuitry in the housing in communication with the first electrode, the second electrode, and the pressure sensor. The circuitry may be configured to determine and store a plurality of impedance-pressure data pairs, from which a representation of a pressure-volume loop may be determined.