Laser modulation for coagulation

A - Human Necessities – 61 – B

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A61B 18/20 (2006.01) A61B 17/00 (2006.01) H01S 3/106 (2006.01) H01S 3/11 (2006.01)

Patent

CA 2756507

An apparatus (100) has a pump module (104) provid-ing pump energy, a resonator (106) and a controller (187). The res-onator (106) includes a gain medium (102) receiving the pump energy from the pump module and producing light; reflective surfaces (110, 156, 158, 160, 162) reflecting light produced by the gain medium back toward the gain medium; and a variable light attenuator (152) receiv-ing light produced by the gain medium. The controller (187) controls the amount of light attenuated by the variable light attenuator such that the apparatus emits windows (306, 308, 310) of pulses of laser light at spaced time intervals, each window containing a plurality of pulses of laser light and each interval (326, 327) between windows being larger than an interval (318) between pulses within a window. The emitted windows of pulses (320, 322) of laser light heat tissue to a temperature that causes coagulation without vaporization.

La présente invention concerne un appareil (100) doté d'un module de pompe (104) fournissant une énergie de pompage, d'un résonateur (106) et d'un contrôleur (187). Le résonateur (106) comprend un support de gain (102) recevant l'énergie de pompage du module de pompe et produisant de la lumière, des surfaces réfléchissantes (110, 156, 158, 160, 162) qui réfléchissent en retour la lumière émise par le support de gain vers le support de gain et un atténuateur de lumière variable (152) recevant la lumière émise par le support de gain. Le contrôleur (187) contrôle la quantité de lumière atténuée par l'atténuateur de lumière variable de telle sorte que l'appareil émette des fenêtres (306, 308, 310) d'impulsions de lumière laser par intervalles, chaque fenêtre contenant une pluralité d'impulsions de lumière laser et chaque intervalle (326, 327) entre les fenêtres étant supérieur à un intervalle (318) entre les impulsions dans une fenêtre. Les fenêtres émises d'impulsions (320, 322) de lumière laser chauffent un tissu jusqu'à une température provoquant la coagulation sans vaporisation.

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