Additional Study Information: The purpose of this research is to evaluate the safety and performance of an experimental system called the Aortix System. The system is being designed for use in patients hospitalized for a worsening of their heart failure symptoms and who also show signs of strain on their kidneys. The Aortix System includes a pump, which we hope may help the heart and also help the kidneys to perform better. The system is being designed for use in patients hospitalized for a worsening of their heart failure symptoms and who also show signs of strain on their kidneys. Heart failure can make it difficult for the heart to pump blood effectively. Normal activities of daily living can often feel difficult. Patients with heart failure tend to be hospitalized frequently. While many treatments exist, newer treatments are needed. The Aortix pump is intended to be used as a heart assist device. In other words, it is hoped that it will help to get more blood to your important organs. This extra help might lower or relieve symptoms.