Biomedical Engineering Reference
In-Depth Information
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-1
7.5
5
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5
2.5
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Frequency in Megocycles
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FIGURE 6.2
Skin resistance and depth of penetration for several metals [6].
coaxial cable. Depth of penetration d (in meters) and skin resistance (in ohms)
are plotted in Figure 6.2.
Coaxial Cable for Microwave Balloon Angioplasty
Based on the information
above, a microwave cable having the following clinical device specifications
was developed:
1.
Device requirements
A. Electrical
i. Attenuation at 2.45 GHz, 6 dB maximum (1.0 dB/ft, or 3.28 dB/m)
ii. Rated power at 2.45 GHz, 80 W
iii. Distal tip (antenna)
B. Mechanical: must be flexible enough to track through catheter around
the aortic arch and across the lesion
C. Functional: must be possible to locate proximal end of antenna under
fluoroscopy to line up with thermocouple
2.
Device description
: coaxial cable with whip or gap antenna
A. Center conductor
i.
Material: Ag-coated stainless steel (SS)
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