Laser photocoagulator with fluence adaptation
AssigneesUniversite de Lille 2, Centre Hospitalier Regional et Universitaire de Lille
InventorsSerge Mordon, Thomas Desmettre
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Abstract
The invention concerns a laser photocoagulator comprising a laser emitting at a wavelength within the ICG absorption spectrum and provided with focusing means and a programmed or controlled module powering the laser such that the mean fluence (F) at the focus starting from an initial time varies according to an increasing function in time not varying at any time by more than 10% of an increasing monoexponential corresponding to formula F−F0(1−e−t/r) wherein F is the initial fluence and τ is a time constant ranging between 3 and 5 mn.
Claims10
A laser photocoagulator comprising:
- a laser having an emission wavelength lying in the absorption spectrum of ICG and provided with focusing means;
- and
- a laser power supply module controlling emission by said laser and arranged for causing a mean fluence F at a focus of said focussing means to vary, starting from a predetermined initial instant, as an increasing function of time that does not depart by more than 10% from an increasing mono-exponential having the form F=F0(1−et/τ) where F0 is a predetermined value of the fluence, t is time elapsed and τ is a time constant lying in the range 3 min to 5 min.
A method of photocoagulating neo blood vessels of a patient, the method comprising the steps of:
- administering a predetermined dose of indocyanine green to a patient;
- and
- after a length of time has elapsed after administration, focusing, on the neo vessels to be photocoagulated, a laser pulse that is controlled in such a manner that a mean fluence F of the laser pulse at the focus, varies from an initial flux density F0 according to a law which does not depart by more than 10% from a value F=F0(1−e−t/τ) where F0 is a predetermined flux density, t is time elapsed after administration of said indocyanine green and τ is a time constant lying in the range 3 min to 5 min.
Dependencies are inferred from the claim text.