APPARATUS FOR DELIVERING A CONTROLLED DOSAGE OF A CHEMICAL SUBSTANCE

摘要

An apparatus delivers a dosage of a chemical substance preferably to a biological tissue in such a controlled manner that the concentration affecting the biological tissue is known at each end every point in time. The apparatus includes a plurality of vessels (20) with each vessel (20) containing a different concentration of the chemical substance. A valve (34) has a plurality of inlets (36) and a single outlet (38) wherein each inlet (36) is connected to a corresponding vessel (20). The biological tissue is preferably held within a chamber (42a) for treatment with the chemical substance. A pump (40) positioned preferably between the valve (34) and the biological tissue provides a transport force for delivering the chemical substance to the tissue. The valve (34) and the pump (40) are controlled by a computer control system (12) which determines which inlet (36) of the valve (34) is fluidly connected to the outlet (38) for providing a preselected concentration of the chemical substance to the tissue such that the concentration of the chemical substance affecting the tissue is controlled at each and every point in time.