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Shockwave therapy - Coggle Diagram
Shockwave therapy
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Background
- Used since 1940s to promote healing process
- Thermal and non-thermal effects
- Ultrasound waves generated from vibrating crystals in the head of device
- Soundwaves pass through the skin and cause vibrating effect in the tissues
- Thermal effects not felt
- Coupling medium needed to conduct soundwaves
- Motion of probe necessary to prevent heating effects
Thermal effects
- U/S is absorbed by the underlying tissues leading to heat generation
- The higher the frequency, the greater the absorption
- Heat is dissipated by the local blood flow of the tissue
- Benefits include pain relief, decreased joint stiffness, increased blood flow
Transmission of wave
- All tissues impede the passage of sound waves
- To minimise steel/air interface, a coupling medium is used (U/S gel)
- Critical angle for u/s at the skin surface is 15 degrees or more
Non Thermal effects
- Stimulation of soft tissue regeneration
- Stimulation of soft tissue repair
- Stimulation of blood flow
Dosage basics
- Depends on size of the lesion
- The greater the surface area the greater the time
- Treatment time= 1min of u/s per size of treatment head
Thermal effects - High intensity in continuous mode (>0.5Wcm2)
Non thermal effects- Lower intensity pulse mode
- 1:1=50% of the time on
- 1:2=33% of the time on
- 1:4=20% of the time on
The more acute the tissue, the greater ratio used ie. 1:4
Dosage Depth
Frequency used relates to depth of lesion
- 1MHz:> 3cm depth
- 3MHz: 0-3cm depth
If deep use 1 MHz
Dosage Pulses
- Acute 1:4 or 1:3 (20% or 25%)
- Subacute 1:3 or 1:2 or 1:1 ( 25% or 33% or 50%)
- Chronic- 1:2 or 1:1 or continuous (33% or 50% or 100%)
Dosage Intensity
- Acute 0.1-0.3 Wcm2
- Subacute- 0.2-0.5 Wcm2
- Chronic- 0.3-0.8 Wcm2