The present invention relates to a bio-stable hydrogel for use in the treatment and prevention of incontinence and vesicouretal reflux. One or more casings may be used for securing the magnetic members to the seat. The heat spreader overlies and extends beyond the outline of the device, and is in thermal contact the top side of the surface mount type package. The system includes a controller that determines an amount of NH3 present from the NH3 sensor, and computes an actuator response function from at least one operating condition of the first SCR catalyst. The web includes a first pair of hinge elements pivotally connecting the web and the housing and a second pair of hinge elements pivotally connecting the web and the access door, wherein the first pair of hinge elements and the second pair of hinge elements cooperate for relative movement of the access door toward and away from the housing. The conical-shaped roller facilitates an application of a coating such as paint or the like to a surface with an adjacent surface as close as a 45\xb0 corner.