An apparatus for providing a restriction and sensing a parameter associated with an anatomical structure comprises a restriction device and a sensing device. The restriction device is secured around a portion of anatomical structure and is operable to form a restriction within anatomical structure. The restriction may be formed or adjusted in response to a bolus located within anatomical structure. The restriction may be formed in response to bolus such that the restriction is formed before bolus reaches restriction device. Once the bolus passes and no more boluses are present, the restriction relaxes and loosens anatomical structure. The restriction device may comprise a gastric band, among other things, and the sensing device may comprise a strain gauge that is configured to detect a bolus passing down an esophagus.
