"The Effect of the Use of an Autotransfusion Device on Hemodynamic Parameters During Resuscitation."

The HemaShock is a tight silicone ring attached to a pressure stocking. It comes wrapped into a doughnut and has a set of handles. The operator simply puts the doughnut over the foot or hand, and pulls on the handles to unravel the HemaShock while applying pressure throughout the appendage. The device displace blood from limbs to central blood system, thus improving preload and cardiac output.