Feedback Sensing for a Mechanical Restrictive Device

An apparatus for forming a restriction, the apparatus comprising:

• (a) an implantable mechanically adjustable band configured to form a restriction in a patient, wherein the mechanically adjustable band defines an inner diameter, wherein the mechanical adjustability of the mechanically adjustable band is configured to permit the inner diameter defined by the band to be selectively varied;
• (b) an adjustment mechanism in communication with the mechanically adjustable band, wherein the adjustment mechanism is operable to provide the mechanical adjustability of the mechanically adjustable band;
• and
• (c) a sensor in communication with one or both of the mechanically adjustable band or the adjustment mechanism, wherein the sensor is configured to sense a physical parameter associated with operation of the mechanically adjustable band, wherein the physical parameter varies with the inner diameter defined by the mechanically adjustable band.