Which instrument is specifically used to guide an arterial tube into a vessel?

The instrument specifically used to guide an arterial tube into a vessel is the groove director. This tool serves a crucial function during the embalming process by providing a channel for the arterial tube, which helps facilitate its insertion into the blood vessel without causing damage. The groove director's design typically features a narrow, elongated shape, enabling embalmers to maneuver the tube accurately into the intended vessel while minimizing trauma to the surrounding tissues.

In contrast, other instruments listed serve different purposes. Forceps are primarily used for grasping or holding tissues but do not assist in guiding a tube. A scalpel is employed for making incisions and is not designed to direct instruments into vessels, while a hemostat is used to clamp blood vessels to control bleeding rather than guide an arterial tube.