the disclosure describes an optical fiber pressure sensor to measure sphincter pressure which may be incorporated into a therapeutic sphincter control system . the system senses sphincter pressure and sends the information to a stimulator that is capable of stimulation therapy to control sphincter contractility , thus reducing unwanted urinary incontinence . measuring sphincter pressure is accomplished through the use of an optical fiber connected to flexible tube section placed through the sphincter , where properties of the emitted light are changed proportional to the pressure on the tube section . the light is returned to a light detector to measure light properties and create an electrical signal representative of the pressure on the tube section . the signal may then be sent by wireless telemetry to an implanted stimulator or external programmer .