What was the initial purpose of Endre Mester's device in the late 1960s?

Endre Mester's device in the late 1960s was initially developed to cure cancer in rats. This research was pivotal in demonstrating the biological effects of laser therapy, particularly in promoting tissue healing. Mester's studies inadvertently showcased that low-level laser therapy not only had effects on cancerous tissues but also seemed to accelerate the healing process in the surrounding healthy tissues. This led to a broader understanding of the therapeutic potential of lasers beyond the initial focus on cancer treatment, paving the way for their application in various medical fields. Through Mester's work, the foundation was established for future explorations into the benefits of laser therapy, specifically in wound healing and pain management.