There are many inventions described and illustrated herein. The cam pin includes a head for securing with a first die half, and a two-stage shank extending from the head. A temperature control knob is coupled to the flow rate control knob, linearly moves leftwards and rightwards, and actuates the control lever to control the opening ratios of the water supply holes. By contacting the heart with the device and by exerting a stabilizing force on the device, the motion of the heart caused by the contraction of the heart muscles id effectively eliminated such that the heart is stabilized and the site of the surgery moves only minimally if at all. The seal balancing volume is in fluid communication with the cage port through the low friction flow restrictor and is maintained at a seal balancing volume pressure. The method includes frequency analyzing ultrasound signals received by the ultrasound probe and displaying indicators of acoustic contact of the ultrasound probe with an object based on the frequency analysis.