PHOTODYNAMIC THERAPY SYSTEM WITH SINGLET O2 DOSIMETRY

Award Information
Agency: Department of Health and Human Services
Branch: N/A
Contract: N/A
Agency Tracking Number: 7165
Amount: $50,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1987
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Quantronix Corp
Po Box 9014, 49 Wireless Blvd, Smithtown, NY, 11788
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 MARTIN G COHEN PHD
 (516) 273-6900
Business Contact
Phone: () -
Research Institution
N/A
Abstract
A SYSTEM FOR PHOTODYNAMIC THERAPY (PDT) THAT PROVIDES, IN ADDITION TO THE THERAPEUTIC LIGHT DOSE, A METHOD OF REAL-TIME, INTRAOPERATIVE DOSIMETRY WILL BE ASSEMBLED AND DEMONSTRATED. IN PDT, A PARENTERALLY ADMINISTERED PHOTOACTIVE DYE (DIHEMATOPORPHYRIN ETHER, DHE) LOCALIZES IN MALIGNANT TISSUE. SUBSEQUENT IRRADIATION OF THE DHE-BEARINGTISSUE WITH LIGHT (630NM) PRODUCES, IN COMBINATION WITH OXYGEN, THE CYTOTOXIC REACTION PRODUCT, SINGLET OXYGEN ((1)O2). BY MONITORING THE REAL-TIME-RESOLVED (1)O2 FLUORESCENCE AT 1.27 NM, A SIGNAL PROPORTIONAL TO THE (1)O2 PRODUCTION RATE WILL RESULT, THEREBY PROVIDING DOSIMETRY INFORMATION. THE SYSTEM TO BE DEMONSTRATED EMPLOYS A CW-PUMPED, Q-SWITCHED, FREQUENCY-DOUBLED YAG LASER DRIVING A TUNABLE DYE LASER EMITTING 70-NANOSECOND, 630-NANOMETER WAVELENGTH PULSES AT A 10-KHZ RATE. IN ADDITION TO PROVIDING REAL-TIMEDOSIMETRY INFORMATION, THE SYSTEM ALSO ALLOWS FOR THE STUDY OF A POSSIBLE INCREASE IN THE THERAPEUTIC EFFECT DUE TO THE GENERATION OF THE CYTOTOXIC AGENT (1)O2 IN "BURSTS." TO DATE, THE RECIPROCITY OF THE PDT LIGHT DOSE DOES NOT APPEAR TO HAVE BEEN THOROUGHLY INVESTIGATED. FINALLY, THE INHERENT WAVELENGTH AGILITY OF A TUNABLE DYE LASER MAKES THIS SYSTEM USEFUL WITH NEW PHOTOACTIVE DYES OPERATING BEYOND 630 NM.

* information listed above is at the time of submission.

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