Abstract

The thermomechanical effect of 1.56-μm fibre laserpulses on intervertebral disc cartilage has been studied usingac conductivity measurements with coaxial electrodes integrated with an optical fibre for laser radiation delivery to thetissue. The observed time dependences of tissue conductivitycan be interpreted in terms of hydraulic effects andthermomechanical changes in tissue structure. The laserinduced changes in the electrical parameters of the tissue areshown to correlate with the structural changes, which werevisualised using shadowgraph imaging. Local ac conductivitymeasurements in the bulk of tissue can be used to develop adiagnostic/monitoring system for laser regeneration ofintervertebral discs.

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