An endoscopic device separates ingested food from gastric fluids or gastric fluids and digestive enzymes, to treat obesity. The process employs a catalyst slurry comprising catalyst particles with an average particle size ranging from 1 to 20 microns. The hydraulic fluid pump is operable to draw low pressure fluid from a sump and deliver high pressure fluid to a series of actuation chambers defined between coaxially aligned first and second components of the rotary operator. When the drive train is actuated in the forward direction, the slave sprocket and the hub move together, and when the drive train is actuated in the rearward direction under the influence of a force greater than the break-free force threshold, the clutch mechanism slips between the slave sprocket and the hub, allowing the slave sprocket and the flywheel to move independently of one another. The first sampled voltage value may be subtracted from the calculated average to produce a delta zero crossing error. The body also includes at least two fluidically segregated free fluid compartments, where each compartment includes at least one sidewall disposed within the body.