Final answer:
Switch to a rigid-tip catheter when suctioning the oral cavity of a vomiting patient to prevent clogging.
Step-by-step explanation:
If you are suctioning the oral cavity of a patient who is vomiting profusely and the soft (French) catheter keeps getting clogged, you should switch to a rigid-tip catheter. A rigid-tip catheter is better suited for suctioning thicker or more viscous materials, such as vomit. It provides a stronger and more effective suctioning force, reducing the likelihood of the catheter getting clogged.