Final answer:
A tracheostomy button is the correct device to maintain the stoma's patency for secretion removal after decannulation in a patient.
Step-by-step explanation:
The device that would facilitate the physician's request to decannulate a patient while maintaining the patency of the stoma for secretion removal is a tracheostomy button. A tracheostomy button is a short cannula that keeps the stoma open after decannulation. It allows the patient to breathe and provides access to the trachea for suctioning secretions, but does not provide long-term ventilatory support as the other tracheostomy tubes do. It is an ideal option when a patient no longer requires the full support of a tracheostomy tube but still needs an open airway for secretion management.