BINGHAMTON, N.Y., Oct. 20 -- Semiconductor Laser International Corp. and Orthogenesis System Inc. of Buffalo, N.Y. have agreed to jointly develop, sell and distribute a low-level laser therapy unit for biostimulation. The companies described the device as being used primarily to treat arthritic conditions and chronic pain, and to accelerate healing of wounds. Under the agreement, SLI and Orthogenesis will each hold a 50 percent stake in a joint venture company to be called Orthogenesis Technologies LLC. SLI has been granted exclusive license to manufacture the Orthogenesis system for the life of the joint venture.