Voice prosthesis with disposable inner cannual valve assembly

A voice prosthesis for insertion into a fistula in a tracheoesophageal wall of a patient, comprising:

• an outer cannula comprising a hollow, annular, flexible body configured to be inserted into a fistula and to maintain the fistula open, the outer cannula further comprising a first retention flange at a tracheal end of the body, and a second retention flange at an esophageal end of the body, the body having a through passage defined therein between the tracheal end and the esophageal end;
• and
• a removable inner cannula comprising a hollow, annular, rigid body to be inserted into the through passage of the outer cannula, the inner cannula further comprising a retention flange at a tracheal end of the inner cannula when positioned into the passageway, the rigid body having a through passageway defined therein, the rigid body open at both the tracheal end of the inner cannula and an esophageal end of the inner cannula, the rigid body.