Table 1.

In Vivo Devices Comparison

Device	Typical Length	Typical Width	Surface Area
Microdialysis Probes (Animal Use)	1–4 mm	~200–500 μm	0.63 mm2 (200 μm o.d.; 1 mm length) 6.3 mm2 (500 μm o.d.; 4 mm length)
Microdialysis Probes Human Use	10 mm	~ 600 μm	18.8 mm2
Enzyme Electrodes (Pinnacle Technologies)†	1 mm	240 μm	0.754 mm2
Enzyme Electrode (Multisite Electrode)	~ 4 mm (shaft)	50 × 100 μm with 1 mm spacing	5.0 × 10−3 mm2
Cylinder Electrodes (in vivo voltammetry)	100–200 μm	5 μm	1.6 × 10−3 mm2 (100 mm)
Disk Electrodes In Vivo Voltammetry	(beveled disk)	5–10 μm	1.96 × 10−5 mm2

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