VAD Outflow Cannula Electrode Pacing Integration
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Solution Overview
Problem
Patients with ventricular assist devices (VADs) are at risk for sudden cardiac death due to arrhythmias, and the implantation of additional devices like ICDs or pacemakers is often avoided due to infection concerns, necessitating a solution that provides electrophysiologic support within the VAD system.
Innovation Solution
A ventricular assist system with an outflow cannula featuring electrodes on its surface or within, which can deliver pacing signals and sense electrical signals from the heart, eliminating the need for additional implantable leads by using a controller to provide therapeutic signals such as pacing, cardioversion, or defibrillation therapies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional implantable devices like ICDs or pacemakers are implanted in VAD patients, then electrophysiologic support is provided, but infection risk increases due to multiple implant sites
Solution Approach 1:
The patent combines the VAD system with electrophysiologic support functions by integrating electrodes and a controller into the existing VAD infrastructure. The VAD controller is modified to detect arrhythmias and deliver therapeutic shocks through the VAD system itself, eliminating the need for separate ICD hardware and reducing infection risk by minimizing implant sites.
Solution Approach 2:
The VAD system is transformed into a multi-functional device that not only provides mechanical circulatory support but also delivers electrophysiologic therapy. The same controller and power source that drive the VAD pump are utilized to detect cardiac arrhythmias and deliver defibrillation shocks, making the VAD a universal device that performs both mechanical and electrical cardiac support functions.
2Reliability
If separate ICD and VAD devices are implanted, then comprehensive cardiac support is provided, but device complexity increases
Solution Approach 1:
The patent merges the ICD and VAD systems into a single integrated device. The VAD controller is enhanced with arrhythmia detection algorithms and shock delivery capabilities, combining the functions of mechanical support (VAD) and electrical therapy (ICD) into one unified system, thereby reducing device complexity.
Solution Approach 2:
The integrated VAD system performs multiple cardiac support functions including pump operation, arrhythmia detection, and defibrillation shock delivery. This multi-functional approach eliminates the need for separate specialized devices, simplifying the overall implantable system while maintaining comprehensive cardiac support.
3Reliability
If multiple implantable devices are used, then electrophysiologic monitoring and therapy are ensured, but surgical procedure complexity and infection risk increase
Solution Approach 1:
The patent combines electrophysiologic monitoring and therapy delivery into the existing VAD implantation procedure. The same surgical team and implantation process used for VAD placement are extended to include integration of arrhythmia detection electrodes and shock delivery mechanisms, consolidating multiple surgical procedures into one.
Solution Approach 2:
The VAD system is designed to provide both mechanical circulatory support and electrophysiologic monitoring/therapy through a single integrated platform. This eliminates the need for separate surgical procedures for ICD implantation, simplifying the surgical workflow and reducing overall procedural complexity while ensuring comprehensive cardiac support.
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
This integrated approach reduces the risk of sudden cardiac death in VAD patients by providing electrophysiologic support without the need for additional implantable devices, thereby improving patient outcomes and reducing infection risks.
Implementation Method 1
The system includes a pacing electrode disposed on an outer surface of the outflow cannula and adapted to be disposed adjacent to an exterior wall of the heart... delivering a pacing signal from the controller to the heart of the patient utilizing the pacing electrode
Data Source
AI summary
Various embodiments of a ventricular assist system and a method of using such system are disclosed. The system includes a pump adapted to be connected to a heart of a patient, an outflow cannula including a first end adapted to be connected to an outlet of the pump and a second end adapted to be connected to an artery of the patient, and an electrode disposed on an outer surface of the outflow cannula and adapted to be disposed adjacent to an exterior wall of the heart. The system further includes a controller electrically connected to the pump and the electrode, where the controller is adapted to provide a pacing signal to the electrode.