Method for photodynamic therapy and applicator for carrying out said therapy

Abstract

Thee present invention relates to medicine, more concretely to photodynamic therapy, and may be used in oncology and dermatology. A method is proposed for photodynamic therapy of pathological surface formations, which comprises sensitizing a surface of the pathological area by superposing an applicator containing 5-aminolevulinic acid, and irradiating the sensitized area with therapeutic optical radiation in the spectral range of 625-700 nm, wherewith an applicator is used which is transparent in the spectral range of at least 625-700 nm, and irradiation is carried out through the applicator. Wherewith therapeutic irradiation is carried out under control of the intensity of fluorescence of the tissues of the pathological area by irradiation of the tissues in the spectral range of 625-635 nm and measurement of the intensity of fluorescence in the range of 635-700 nm through the applicator. In the method an applicator may be used which is also transparent in at least one of the spectral ranges 390-460 nm, 510-540 nm or 570-590 nm. The applicator used in the proposed method consists of a base of a bioinertial material and a sensitizing layer including a carrier and 5-aminolevulinic acid dissolved or dispersed in the carrier. The base is made in the form of a film of a bioinertial polymer, transparent in the spectral range of at least 625-700 nm, and the carrier is made in the form of a film layer of biocompatible hydrophilic terpolymers of N-vinylpyrrolidone, amide of acrylic acid and of ethyl ether of acrylic acid with a ratio of the monomeric links respectively (20-35):(35-60):(20-30) wt. % and a molecular weight of from 20 000 to 1 000 000 Daltons. The bioinertial polymer may also be transparent in at least one of the spectral ranges of 390-460 nm, 510-540 nm or 570-590 nm. This polymer is regenerated cellulose, polyethylene terephthalate or a polyamide. The proposed method for photodynamic therapy and the applicator for implementation of the method make it possible to enhance the efficacy of photodynamic therapy and reduce the expenditure of 5-aminolevulinic acid.

Dependencies are inferred from the claim text.