A method and an apparatus for continuously mixing two flows, a first, larger flow and a second, smaller flow. A so called, TeachMe component of the system allows the defining of a studentspatients long-term behavior or academic or social goal treatment in a hierarchical relationship of skills in treatment plans. The ends are configured and dimensioned for insertion within tissue on opposed sides of a wound. Additionally, a gas source configured to pressurize the gas chamber with a low pressure gas in order to increase thermal conductivity between the substrate and the temperature sensor is provided.