The Safety and Feasibility of the eLym™ System

This study is testing the safety and feasibility of a new device called the eLym™ System, which is designed to help the body remove excess fluid more effectively in patients hospitalized for severe fluid overload (decompensated heart failure) who are not responding well to standard diuretic (water pill) treatment. **You may be eligible if...** - You are 18 or older and hospitalized for acute decompensated heart failure - You are on IV diuretics and still have significant fluid overload (leg swelling, shortness of breath, etc.) - Your kidney function meets the minimum threshold (eGFR ≥20) - You have had a prior heart failure hospitalization in the last 6 months, reduced kidney function, or poor response to your first IV diuretic dose - Your heart failure markers (BNP or NT-proBNP) are elevated **You may NOT be eligible if...** - You do not have significant fluid overload - Your kidneys are severely impaired (eGFR <20) - You have certain types of heart failure not suitable for the device - You are in cardiogenic shock or require immediate intensive interventions Talk to your doctor to see if this trial is right for you.