Progress with the HeartSaver Ventricular Assist Device

Background. Ventricular assist devices (VADs) have been shown to be effecti ve for short- or long-term circulatory support. Devices are either being ad apted or newly designed for longer term or permanent support, with the goal to provide patients with improved quality of life. Since 1990, a program h as been in place to develop a totally implantable, permanent VAD. Methods. A multidisciplinary team is developing this VAD with specific goal s in mind: (1) that it have an intrathoracic position, (2) that it be a tot ally implantable device without any percutaneous connections, and (3) that it be possible to communicate with the device from remote locations. These goals would allow for complete patient mobility and flexibility for follow- up. Results. The electrohydraulically actuated VAD combines the blood pump, vol ume displacement chamber, energy converter, and internal electronic module into a single compact unit. The device called the HeartSaver VAD is powered by a transcutaneous energy transfer system and can be remotely monitored a nd controlled. Prototypes of different versions of the device have been tes ted in vitro and in vivo with satisfactory performance. Conclusions. The prototypes of the HeartSaver VAD have functioned well unde r test conditions and fulfilled the outlined goals. Further development and testing of the design are being conducted before clinical availability. (C ) 1999 by The Society of Thoracic Surgeons.