When passing a heavy surgical instrument to the operator which grasp is used?

The correct answer is Palmar Grasp.

A heavy surgical instrument is usually passed to the operator using the palmar grasp. The palmar grasp is also known as the power grasp or the full-hand grasp. It involves the use of all the fingers and the palm of the hand to grasp an object. The thumb is placed opposite the fingers, and the object is held securely between them. This grip provides maximum strength and control, making it ideal for handling heavy or delicate objects.