A new lifesaving device is now available to emergency responders throughout Rock County. The LUCAS CPR machine can automatically deliver chest compressions to a patient suffering a heart attack. Beloit Fire Department Deputy Chief of Emergency Medical Services Joe Murray says the device will help paramedics by freeing up personnel, reducing fatigue, and continuing chest compressions without interruption. Murray says the two units donated by Mercy Health System to the Beloit Fire Department, and one to the Janesville Fire Department Thursday will help with a countywide deployment. Mercy Health System EMS Medical Director Jay MacNeal is eager to see how well new automated CPR machines work in the field. He intends to study their success rate over the next year. Each unit weights about 20 pounds, costs $15,000, and fits into a backpack.