A plurality of embodiments for a flexible probe used to provide photodynamic therapy (PDT) and to effect other medical procedures at an internal treatment site inside a patient's body. Each of the embodiments of the flexible probe (100, 108, 130, 158, 182, 190, 220, 280, 370, 390, 440, 460, 520)...http://www.google.ca/patents/US5800478?utm_source=gb-gplus-sharePatent US5800478 - Flexible microcircuits for internal light therapy