Biomedical Engineering Reference
In-Depth Information
ii.
Dimensions
a. SS diameter 0.005
0.0003 in.
b. Coated wire diameter 0.006 in. maximum
c. Coating thickness 0.0003
±
±
0.0001 in.
d. Length 70.0 in. maximum
B.
Dielectric
i.
Material: Goretex expanded PTFE (polytetraflouroethylene)
ii.
Dimensions: diameter 0.017 in. maximum wrapped (0.015 in. under
compression of outer conductor)
C.
Outer conductor
i.
Material
a. Option 1: Ag-coated copper-rolled flat wire
b. Option 2: Ag-coated SS-rolled flat wire
ii.
Dimensions
a. Width 0.007
0.002 in.
b. Thickness 0.0015
±
0.0001 in.
c. Ag thickness 0.0003
±
0.0001 in.
d. Wrapped diameter 0.022 in. maximum
D. Connector
i. Material: SS/copper
ii. Type: female SMA (subminiature version A) per MIL-C-39012
E. Coating
i. Must withstand 100°C
ii. Thickness 0.002 in. maximum
3.
Device design
A. Dielectric extruded over center conductor
B. Two layers of Ag-coated SS ribbon either overlap wound over dielec-
tric to form outer conductor or wound clockwise and counterclockwise
C. SS hypotube slid over proximal end of outer conductor coils for support
and soldered to coils
D. Connector attached to proximal end
E. Whip antenna formed at distal end by removing outer conductor coils
F. Distal end of cable to be coated with an insulator
G. Proximal end of antenna to be radio-opaque
4.
Biocompatibility and sterility
A. Material testing
i. All material to pass USP (United States Pharmacopeia) biological
tests for class VI plastics
a. Sensitization assay (does not promote allergic reaction)
±
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