a fully automatic organ pressure sensitive apparatus for dislodging and removing obstructions in bodily cavities or organs by both delivering and removing fluid thereto , operable by high rate continuous or intermittent infusion of fluid solvent over a set pressure range to effect rapid dissolution and removal of the obstruction without complications to the patient . by continuous feedback monitoring of fluid pressure in the bodily organ or cavity of interest , the apparatus can constantly vary infusion and aspiration rates to maintain the set pressure range . if the pressure persists above or below the set range , the apparatus activates a safety feature leading to a period of maximal aspiration and cessation of infusion , followed by cessation of solvent transfer and triggering of an alarm to alert the operator .