What is the name of Hollow needle used to withdraw fluid from joint?

The hollow needle used to withdraw fluid from a joint is called an aspiration needle. This type of needle is specifically designed for joint aspiration, which is a procedure performed to remove excess synovial fluid from a joint to diagnose or treat certain medical conditions. Aspiration needles are typically made of stainless steel and come in different sizes and gauges, depending on the joint being accessed and the amount of fluid that needs to be removed.