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Flashcards in Diathermy Deck (11)
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1

Diathermy Induction

greater magnetic that electric
pt. in magnetic field
greater flow in tissue with least resistance
eddy currents
tissue with high electrolytes= more inc in temp

2

Diathermy Capacitor

Stronger electric that magnetic
pt. area between two plates
center of e-field has highest current density
greater resistance by tissue=greater heat

3

Pad electrodes

need uniform contact
pad separation at least as wide as they are
several layers of towel
increase distance between pads=inc penetration depth

4

Drum

monoplanar coil inside housing
towel between drum and skin to prevent hotspot
best penetration if housing contacts towel

5

Air spaced plates

surrounded by glass/plastic guard
suited for area with lower fat
closer to skin=more heat

6

Cables

pancake coil >6cm diameter
1cm toweling between coil and skin
spacers used to keep 5-10 cm between turns

7

Indications for PSWD

Control pain and edema
control pain
would healing
nerve healing (animal tested)
bone healing (animal tested)

8

Contraindications for PSWD

mag/tumor
pregnancy
pacemaker
contact lens/eye
pt. who hemorrhage/active bleeding
fever
metal
cardiac insufficiency
growth plates
acute injuries
ischemic tissues

9

Thermal effects

vasodilation
inc metabolism
mm. relax
inc pain threshold through sedation of nerve

perspiration, inc ext, nerve growth
inc body temp, pulse
decreased blood pressure

10

Non thermal effects

repolarized damaged cells
regularize cell growth
re-establish Na pump
microvascular perfusion
inc cell function
white blood cells to injured site
alter membrane activity, ca binding and ion binding phs

11

How Diathermy functions

ion oscillation
dipole rotation