Toroidal Ventricular Assist Device

Synchronous Pulsatility

The TORVAD senses cardiac rhythm to provide synchronous pulsatile support

Low Shear

Low rotational speeds and controlled gaps result in physiological levels of shear, one to two orders of magnitude less than continuous flow devices

Adaptive Pumping

The TORVAD measures pressure and detects arrhythmias and will automatically adjust pump flow rate if more or less flow is needed

Synchronous Pulsatility

Two independently controlled pistons rotate in a toroidal pumping chamber. One piston acts as a valve while the other rotates to produce pulsatile 30ml ejections. After each pump ejection, the pistons exchange roles. Beat-to-beat synchronization is achieved by timing pumping with the cardiac rhythm obtained from an integrated ECG sensor.

Counterpulsation is the normal operation mode, which 1) preserves aortic valve flow, minimizing the risk of aortic valve complications associated with continuous flow devices, and 2) maintains natural preload sensitivity, preventing overpumping and right heart failure.