Card Set Information
What is often used with infrared?
What type of heat is IR?
What do we use UV for?
chemical effects, not heat
What type of heat is electricity (diathermy)?
IR produces what?
light and heat
How do luminous bodies emit light?
on their own
How do non-luminous bodies emit light?
reflecting light of a luminous body that falls on their surface
What is the grotthus-draper law?
only energy that is absorbed is effective in producing changes in the body
What is the inverse square law?
the intensity of energy on a surface is inversely proportional to the square of its distance from the surface
if there is more distance between machine and body the intensity is less
What is the cosine law?
the greatest intensity of radition is achieved when the source of light is perpendicular to the area being treated (right angle)
What type of skin absorbed infrared better?
What type of infrared do we use today?
Luminous IR is used with what?
variety of reflectors
incandescent bulbs (red, amber, white)
What are the advantages?
luminous feels less intense and penetrates deeper
deliver superficial heat without weight of HP
dry heat-can use with open wounds
easier to control intensity than with paraffin
use a lot less linen then HP
observe body part during tx very easily
no waiting time between pts
What are some disadvantages?
doesnt work on gate theory
depth of penetration very poor-very superficial
pt cant move during tx
glare from light-must use goggles, can damage eyes
insurance companies dont want to reimburse for it anymore
What are some physiological effects?
stimulation of local circulation
stimulation of local nerve endings
possible permanent pigmentation
wheal formation, local edema, blistering
increased pulse, resp., and decreased BP
increased kidney elimination
What are some indications?
subacute and chronic conditions
wounds-more for wet wounds (dry them out)
use prior to estim
get tissues to relax-prior to massage or exercise
What are some contraindications?
very young/old-thermoregulatory system
severe PVD (typically LEs, very poor circulation, little feeling)
anything that has caused a sensory loss (new scars, burns)
What are some precautions?
tx time 10-30 mins
distance of bulb from skin
If the machine has a bulb of 1000watts how far from skin should it be?
If bulb has 500-600watts how far from skin should it be?