A method is described which allows certain Optical Proximity Corrections to be computed in a few minutes. The processing gas jetting portion of the processing gas injecting unit includes a central injecting portion and a peripheral injecting portion surrounding the central injecting portion. In the revascularization methods the extravascular passageway is utilized for blood flow. The enclosure which itself may be heated or unheated, blankets the hose to provide heat to the outer hose coils to ensure that the extremities are maintained at a freeze-free temperature.