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Figure 3 | BioMedical Engineering OnLine

Figure 3

From: Computer modeling and ex vivo experiments with a (saline-linked) irrigated electrode for RF-assisted heating

Figure 3

Impedance progress throughout the experiments. Three phases can be observed: A) Electrode placed on tissue surface without saline infusion. B) Saline is infused and impedance drops drastically; the saline initially accumulates around the electrode, forming a pool (i.e. the height h of the saline layer increases considerably) possibly due to the depression caused by the pressure of the electrode on the tissue. Some seconds after continuous infusion sets the retained saline in motion the pool disappears, the height h decreases slightly and consequently impedance rises (arrow) until reaching a steady state. C) During RF heating tissue temperature increases gradually and impedance decreases in proportion.

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