How RPW and FSW differ: The two devices’ unique wave forms impact a variety of factors regarding how these devices transfer energy into tissue. Early ESWT research centered around FSW technology, but over recent years RPW technology has received more attention. Chattanooga’s FSW generates sound waves via an electromagnetic hand piece with a built-in water buffer, while the RPW utilises a pneumatic/ ballistic design. These differences impact the waveforms they produce. 13,14 Focused shockwaves have higher peak energy and generate maximal force at a selected depth. FSW devices can reach tissue at depths of up to 12.5 cm. 14 Radial pressure wave devices generate their maximal energy on the skin, which then dissipates as it travels to depth. 3 Maximal treatment depth is 6.0 cm with RPW units. Energy levels at depth are dictated by the settings on the machine and the applicator used. The energy being delivered at depth is over a broader area than what is imparted by FSW devices (see below).
Focus Shockwave
RPW
Skin Surface
Skin Surface
Target Zone
Target Zone
Divergent Waves
Convergent Waves
4
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