Dynamic Perfusion Flow Control for Myocardial Therapy Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing perfusion systems for delivering therapeutic agents to targeted body regions, such as ischemic tissues, face challenges in dynamically controlling inflow and outflow to accommodate changing physiological conditions, leading to potential adverse effects like increased coronary pressure, myocardial congestion, and arrhythmias, particularly in treatments involving myocardial perfusion and cooling.
Innovation Solution
A system that dynamically controls fluidic inflow and outflow to a target region by using algorithms responsive to physiological conditions, adjusting parameters like flow pulse timing, duration, and temperature, with a controller managing inflow and outflow channels to maintain optimal therapeutic effects while minimizing adverse physiological responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If percutaneous coronary intervention (PCI) is performed to re-establish tissue perfusion, then myocardial salvage is improved, but distal occlusion of smaller arteries may occur due to clot debris flow
Solution Approach 1:
The system segments the coronary circulation into a treatment zone (distal to occlusion) and a protected zone (proximal vessels), using a protective device to filter embolic debris while allowing therapeutic perfusion to reach the ischemic myocardium
Solution Approach 2:
An intermediary protective device is introduced into the coronary circulation to mediate between the thrombolytic therapy and the distal vasculature, capturing clot debris while permitting oxygenated blood and therapeutic agents to reach the endangered myocardium
2Quantity of substance
If retrograde perfusion of oxygenated blood is delivered to ischemic myocardium, then tissue oxygenation is improved, but increased coronary pressure and myocardial congestion may occur
Solution Approach 1:
The system incorporates feedback control mechanisms that continuously monitor coronary pressure and myocardial congestion markers, dynamically adjusting the rate and volume of retrograde perfusion to maintain therapeutic oxygenation while preventing harmful pressure elevations
Solution Approach 2:
The perfusion system transitions from static to dynamic control, where flow rates, pressures, and timing are continuously adjusted based on real-time physiological responses of the myocardium, allowing optimization of oxygen delivery while preventing congestion
3Reliability
If therapeutic cooling is applied to retroperfused tissue, then tissue protection is improved, but ventricular arrhythmias and cardiac arrest risk increase
Solution Approach 1:
The system applies therapeutic cooling locally to the retroperfused myocardium rather than systemically, creating a temperature gradient that provides metabolic protection to ischemic tissue while maintaining normal body temperature in non-target areas, thereby reducing arrhythmia risk
Solution Approach 2:
The system dynamically adjusts temperature parameters during retrograde perfusion, controlling the degree and duration of cooling to achieve optimal tissue protection while staying below thresholds that trigger ventricular arrhythmias or cardiac arrest
4Device complexity
If fixed flow rates are used in perfusion systems, then system simplicity is maintained, but inability to accommodate changing physiological conditions leads to adverse effects
Solution Approach 1:
The system replaces fixed flow rates with dynamic, programmable flow profiles that can be adjusted in real-time based on physiological feedback, allowing the perfusion system to adapt to changing myocardial needs during different phases of treatment
Solution Approach 2:
The system employs periodic pulsatile flow patterns that mimic natural coronary physiology, delivering therapy in synchronized cycles that enhance perfusion efficiency and accommodate the rhythmic nature of cardiac function
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 system effectively delivers therapeutic agents to target regions by dynamically adjusting inflow and outflow to accommodate changing conditions, reducing the risk of adverse effects like arrhythmias and congestion, thereby optimizing therapy delivery.
Implementation Method 1
The system employs a heat exchanger to cool the perfusion fluid, enabling therapeutic hypothermia of retroperfused tissue
Data Source
AI summary
A therapy delivery system for delivering therapy to a target region in a body includes an inflow channel and an outflow channel through which regulated inflow and inflow may be conveyed. The inflow and outflow is controlled by flow regulators in a manner to deliver a therapeutic agent to the target region and achieve a therapeutic response. A controller dynamically adjusts a ratio of inflow to outflow in response to an input that is related to changing physiological conditions.