Abstract: The apparatus comprises a wheeled base, a vertical pole mounted on the base, and upper and lower, elongate, horizontal arms extending from the support member. The apparatus can be rolled up to a surgical bed so that the outer end of the upper arm is positioned over the patient on the bed and the outer end of the lower arm is located beneath the bed below the patient. Each arm is slidably mounted on the pole. Each arm carries quick-acting first means for disengagably locking the arm to the support member to prevent sliding movement and quick-acting second means for temporarily disengaging the first means and incrementally advancing the arm along the support member. Thus the arms can be quickly moved to bracket the patient and bed underside, then locked and advanced incrementally to clamp against the bed and patient. The apparatus is useful for clamping open arterial incisions to stop bleeding.