A method of treating a treatment area of a body lumen includes inserting an elongated member into the body lumen, wherein the elongated member is configured to guide a delivery member, the delivery member possessing an outer portion on which is mounted a treatment membrane, moving the delivery member to the treatment area, contacting the treatment membrane mounted on the delivery member with the treatment area for a predetermined period of time, and withdrawing the delivery member from the treatment area after the predetermined period of time.
