A three-in-one AC servo drive includes a main console, a control module, a power module and a plurality of servo motors. The replacement mitral valve has structure and dimensions that are uniquely suited to engage the annulus surrounding the native mitral valve and to restore normal function to a diseased valve. It also preferably incorporates a selector for allowing a user to control the changing of the digital information displayed on the LCD. Such low air loss feature provides a patient contact surface exhibiting a high moisture vapor transfer ratio in conjunction with a forced air flow to aid in reducing the moisture and heat near the patient’s body. The sheet pressure sensor can detect the pressure while keeping air ventilation characteristic by giving a pressure detection function to the fiber layers. Pulse weightings emphasize lower layer pulses relative to the higher layer pulses.