A biologically implantable artificial sphincter system and methods of using the same is disclosed. The artificial sphincter system disclosed herein comprises a sphincter band and a piezoelectric element, both of which are adapted and configured for coordinated operation to open and/or close a body cavity. The artificial sphincter systems are useful in the treatment of urinary incontinence, fecal incontinence, and reflux disorders. The implanted artificial sphincter can also provide a signal to the recipient to urinate or defecate.