Invisible Power Port ID Tattoo

A method, comprising:

• identifying a target area of a patient's skin to be accessed in a medical procedure;
• injecting into at least a portion of the target area a solution including a plurality of microspheres, the microspheres comprising a phosphorescent dye, reactive under a predetermined wavelength of ultraviolet light, encapsulated by a material which does not absorb ultraviolet light;
• and
• locating the target area by illuminating the skin with ultraviolet light.

A method, comprising:

• identifying a target area of the skin to be accessed in a medical procedure;
• injecting into at least a portion of the target area a solution including a plurality of microspheres holding a gas reactive to ultrasonic waves;
• and
• locating the target area by passing ultrasound energy through the skin until a pattern indicative of the presence of the gas containing microspheres is identified.