Final answer:
A Sequential compression device (SCD) is used to prevent the formation of blood clots by applying intermittent pressure to the limbs.
Step-by-step explanation:
The piece of equipment used to prevent the formation of blood clots is a Sequential compression device (SCD). This medical device is used especially in postoperative patients or those who are at risk for deep vein thrombosis (DVT). The device works by applying intermittent pressure to the limbs to enhance blood flow and prevent stasis, thereby reducing the chances of clot formation. Unlike options A, C, and D, which pertain to temperature regulation, pain management, and joint mobility respectively, the Sequential compression device is specifically designed to address blood clot concerns.