Patent ID: 8753332
Filing Date: 2014-06-17
Classification: A61B

Abstract:
1. A laser device for ablating a biological tissue, comprising: a laser source that is configured to emit a laser beam in a series of at least two consecutive pulses with a repetition rate within 200 Hz and 1 kHz to a first location to create a pore with increasing depth; optics configured to modify the laser beam to direct the laser beam on the biological tissue in a direction that is parallel to a back scattered light of the laser beam from the biological tissue; a poration controller configured to control the laser source to emit the laser beam to create an ablation in the biological tissue; a sensor configured to receive and measure an intensity of back scattered light of the laser beam from the biological tissue; a tissue controller that is operationally coupled to the sensor to receive a time discrete pulse train of at least two consecutive sensor signals from the sensor representative of the intensity of back scattered light of the laser beam; and wherein the tissue controller is configured to calculate the differential or the integral of the time discrete pulse train of at least two consecutive sensor signals during creation of the pore and generate a tissue control signal when a value of the time discrete pulse train of at least two consecutive sensor signals decreases in a predetermined amount associated with a water content transition between a first skin layer and a second skin layer the tissue controller being configured to modify at least one of intensity, diameter, moving direction and moving speed of the laser beam, based on the tissue control signal.