A printer includes laser beam detecting sensors for detecting a laser beams at two positions in the main scanning direction. The lamp includes an LED module, an inner heat sink disposing air passages along an axial direction thereof, a heat pipe assembly including multiple U-shaped heat pipes, and an outer heat sink. Alternatively, the hydrogels may be mechanically disrupted and used in implantable articles, such as breast implants. The applicator tool and the tissue are able to move together while the engagement device prevents or inhibits relative movement between the applicator tool and the tissue. Preferably, the present invention provides a method of affecting a variety of physiological disorders or pathological conditions by placing an electrode adjacent to or in communication with at least one ganglion along the sympathetic nerve chain and stimulating the at least one ganglion until the physiological disorder or pathological condition has been affected.