A
system and method for the destruction /
ablation of stones, calculi or other hard substances by means of
laser energy is disclosed. As a consequence, several important medical treatments can be performed, especially
lithotripsy. The
system comprises a
diode laser source emitting at least at one
wavelength, one or more optical fibers which convey
laser radiation to the treatment site and a liquid
delivery system used for creating a liquid environment around the stones (calculi). The laser device emits at least one
wavelength which is highly absorbed in the surrounding / covering medium, thus causing
evaporation and
cavitation effects that lead to stone / calculi destruction. Different
radiation configurations may be used. In one embodiment continuous
radiation is used to create sparkler-less
plasma bubbles able to destroy hard substances.; In another embodiment
high peak power
pulsed radiation is used. Wavelengths of 1470 nm, 1940 nm, or 1550 nm are preferred. Additionally it can be applied in combination with another
wavelength with medium absorption in water such as 980 nm. In another embodiment a concentric double core
fiber is used, in which the ignition radiation is guided in near single mode, inner core and the radiation used to maintain and enhance the pulse is guided into the surrounding second
outer core. In another preferred embodiment, the use of multiple optical fibers allows for treating larger stones in a shorter time period. In another preferred embodiment, cooling liquid is supplied to the
impact site to further reduce thermal heating of the stone, thus diminishing risks of
tissue damage caused by stone fragment anchorage and
thermal energy.; With these
safer and improved methods and
system, enhanced
lithotripsy treatments can be performed in a shorter
treatment time, destroying a wider range of stones with less risk of
tissue damage, and less patient and physician stress.