A cryogenic storage tank having an inner vessel disposed within an outer vessel. A method for using self-generated pressure in promoting circulation in conditions including but not limited to, lymphatic and traumatic edemas, venous disorders, limb ulcers, varicose veins, muscle fatigue, sports medicine, cellulite treatment, diabetic feet, feet massage for recreation or cosmetic enhancements. In addition, a tool head is used whose cutting inserts are arranged in such a way that each cutting insert has a tool reference plane Pr through in each case identical selected cutting-edge points perpendicularly to the assumed cutting direction in accordance with DIN 6581, this tool reference plane Pr running within an angular range of 90 to 135 to the rotary axis D of the tool head. In another embodiment a laryngoscope adapter may be detachably affixable to the channel laryngoscope equipped with the non-removable camera to provide a decontaminated or sterile surface to permit re-use of the channel laryngoscope without having to undergo washing or decontamination procedures. Alternatively or in addition, the dielectric coating on the phase change particles may comprise dielectric particles that are dispersed in a dielectric matrix, again with the preferred effect of increasing the thermal conductivity of the encapsulation material. The apparatus performs a subjective eye examination by prompting a subject to view test symbols displayed on a computer screen by one of the right and left eyes at a time.