I am developing a medical device (orthopedic prosthetic), during application I want to use UV curable adhesive for fixing and cavity filling. for that I am planing to use High power UV led light having peak wavelength of 365 nm and intensity is ~100mw/cm2. I coulden't find any confirmed data on safety study over skin. exposure is one time and it would last for 3-4 minutes.
Should I go ahead with above UV LED light ?
Would you please help me to find safety study for this ?
Hi,
The sun have an intensity around 5-6 mw/cm² in UV and you received an MED in 5-15 min. Your intensity is +- 20 time higher.
Even if you expose the skin only in UVA, 3-4 minutes seems to me to much
Best regards
Hi,
wavelenght at 405 nm is less harmful by definition but still energetic
You need to be under 2J/cm² to be in the safe side
then if you keep 100mw (365 nm) -> +- 20 secondes
even if you are lower at 405nm 3-4 min seems to much
for general and occupational UV exposure limits see ICNIRP:
http://www.icnirp.org/cms/upload/publications/ICNIRPUV2004.pdf
there a monochromaltic exposure limit of 270 kJ/m2 to eyes and skin is set at 365 nm, but also an overall limit of 10 kJ/m2 to UVA irradiation (315-400 nm). Because of thermal effects the exposure rate should not exceed 10 kW/m2, especially for the eye.
All these exposure limits do not pertain to medical applications. The question apparently relates to fixation of a prosthetic, which to me is a borderline case. Considering UVA1 therapies in dermatology, there should not be a problem with a skin exposure of 240 kJ/m2 @ 365 nm for this application.
It is also not necessarily true that 405 nm would be any safer, e.g. if we consider oxidative effects
the 405 nm light usually has some in the 400 nm region out to 385 and up to 425. but you can also get 400 nm LEDs that would be similar in effect to the 405.
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