Presentation on theme: "EVALUATION OF INTENSE PULSED LIGHT DEVICES USING STANDARDIZED METHODOLOGY G. Town 1, C. Ash 2 1 RPA2000 Laser Protection Adviser, Haywards Heath, United."— Presentation transcript:
EVALUATION OF INTENSE PULSED LIGHT DEVICES USING STANDARDIZED METHODOLOGY G. Town 1, C. Ash 2 1 RPA2000 Laser Protection Adviser, Haywards Heath, United Kingdom 2 OptoElectronic Engineer, Swansea, Wales, United Kingdom The following potential conflict of interest relationships are germane to my presentation: Financial grant, equipment, consulting fees and travel expenses paid by CyDen Ltd.
Status of FDA devices used for the material being presented: –NA/Non-Clinical Status of off-label use of devices, drugs or other materials that constitute the subject of this presentation: –NA/Non-Clinical
Conclusions ASLMS Boston 2006 Vital to identify discrepancies between manufacturers claims and actual measured outputs to ensure safety of the IPL operator and patient. Some IPL systems tested were operating significantly outside displayed values or performance characteristics claimed by the manufacturer. This finding is of considerable concern and may lead to increased risk of under or over-treatment or burn injury to the IPL patient. The methods presented in this paper describe simple procedures for testing key parameters of IPL devices, which could be used in the implementation of standardised testing for the safety of IPLs. An international standard is needed to control IPL technology used in the Medical and Spa industries. (Paper submitted for publication in JCLT)
Introduction 18 different devices from 15 different manufacturers and 36 applicators (different cut-off filters) from USA, UK, Israel, Sweden, Switzerland, China and Italy were tested by the authors. Data was gathered on-site between patient appointments over a 6-month period in clinics where devices were in daily use. Manufacturers information was collected from user manuals, company web sites and literature.
Comparing Fluence Values 30 IPL applicators were measured at maximum fluence of which 11 were more than 20% below and 8 were more than 10% above fluence levels given on the device display or claimed in user manuals, even where brand- new lamps were tested.
Comparing Fluence Values 9 IPL devices out of 18 had applicators that were outside of the standard formedical Class 4 lasers (> ±20%)
Comparing Pulse Duration Only 14 of 29 pulse duration measurements were within ±20% of the manufacturers stated or system-displayed values. Study Ref Stated Pulse Duration (ms) Measured Pulse Duration (ms) Study Ref Stated Pulse Duration (ms) Measured Pulse Duration (ms) A3 x 10 ms = 303 x 6 ms = 18Ishort:5.5/5.5 (2)5.5/5.5 (2) A11414.5med:3.6/3.6/3.6 (3)4.0/4.0/4.0 (3) 2 x 2.5 ms = 152 x 3 ms = 15.5long:3.6/3.6/3.6 (3)4.5/4.5/4.5 (3) B515-17J40 C515-17K34.837 D5051123121 10-15no dataL15 black2.2 E10-5010-51 ms15 blonde5 F20-150missing pulsesM33 20-151missing pulses55 G106N35132 206.635132 208.71024 H5.5/5.5/5.55.4 6.4 7.0O4042 Q30/40/50
Comparing Electrical Discharge Shape Only IPLs E and G exhibited a true single square pulse shape confirming that they used partial discharge capacitor technology although close pulse- stackingin devices A and O effectively achieved the same pulse shape and device D showed a nearly square pulse shape. IPL E IPL A IPL GIPL C IPL BIPL Q
Measurement of UV Content Shorter wavelengths in the ultraviolet region of the spectrum may burn the patients skin or may be hazardous to the operators eyes and are therefore removed. Of the 30 applicators tested, 6 IPLs measured more than 1% and two measured more than 2% of unwanted UV output below 400 nm when cut-off filters were set significantly higher.
Comparing Average Spectral Output The spectrum analysis of light emitted from flashlamps contains both discrete line structure and continuum radiation. The continuum radiation is blackbody radiation, characteristic of the temperature of the plasma in the discharge. Of 29 applicators 19 (65.5%) with cut-off filters that were inaccurate by more than 20 nm versus the claimed cut-off value given by the manufacturer. Only 10 applicators (34.5%) were within 20 nm of the stated cut-off.
Comparing Time-Resolved Spectral Output Schematic illustration of the difference in the spatial and temporal characteristics of a free discharge and partial discharge pulse to an IPL xenon lamp.
Time-resolved spectrum sampled every 1 ms using an OceanOptics HR2000+ spectrometer and SpectraSuite software to demonstrate the stability and efficiency of spectral output for free-discharge (IPL C) vs. square pulse systems (IPL E) IPL CFree DischargeIPL ESquare Pulse
IPL D single pulse programs produce a decaying square pulse
IPL D in a multi-pulse program showing more pronounced free-discharge characteristics
Close stacking of sub-pulses produces a square pulse effect unless sub-pulses are spaced too far apart when they simply perform like conventional free-discharge pulses. IPL A Free Discharge
IPL L showing sub-pulses in typical free discharge format
IPL K showing sub-pulses in typical free discharge format
IPL C showing a typical free discharge of ca 3 ms of energy
CONCLUSIONS Many manufacturers of IPLs make claims that are not substantiated as measured by this study Manufacturers operating an ISO 9000 Q/A system (Medical CE-mark) showed greater consistency of stated and actual values for fluence, pulse duration and spectral cut-off filter accuracy over the stated lifetime of the applicator / lamps. Partial Discharge (square pulse) Systems Produce the lowest possible intensity for a given fluence thus minimising discomfort and other side effects such as skin burns (i.e. safer to use) Free Discharge (rising/falling slope) Systems Produce high energy in short pulse durations with spectral shift and wasted energy
CONCLUSIONS A time-resolved Spectral Footprint as shown in these measurements is helpful in determining the true pulse duration and spectral pattern of useful energy for optimized clinical efficiency This first serious attempt to measure IPL performance characteristics provides criteria that should be carried to national representatives of the competent regulatory body (IEC) to promote an international standard for measuring intense light devices
Acknowledgements The authors wish to thank the following companies for their contribution in reviewing the fluence test methodology used in this study: Cyden Ltd., Swansea, Wales, UK (www.cyden.co.uk) Energist Ltd., Swansea, Wales, UK (www.energist-international.com) Instinctive Technologies Ltd., Bedford, UK (www.instinctiveuk.com) Lynton Lasers Ltd., Cheshire, UK (www.lynton.co.uk)
Measuring key parameters of Intense Pulsed Light (IPL) Devices. The key for the device ID: A = DDD EllipseLight A1 = DDD EllipseFlex B = Active Crystal512 C = Chromogenex Chromolite D = Alma Harmony E = CyDen iPulse F = Freedom (Chinese/UK) G = Unimed NovaLight H = Lumenis Quantum I = Lumenis Aculight J = Greenton Ecolite V K = MBC Plasmalite L = Lynton Lumina M = Energist ULTRA N = Radiancy SkinStation O = Sciton BBL (Profile) P = GP Flash 1 Q = Alma Aria (was Lovely II or SuperiorPro = Harmony with IPL only)