Device for treating tissue by pulse sequence group
AssigneeInstitut National de la Sante et de la Recherche Medicale
InventorsSerge Mordon, Jean-Marc Brunetaud, Hubert Guillet
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Abstract
The invention relates to a device for heat treatment of tissue. The device comprises a laser (20) provided with means enabling it to emit laser radiation in the form of a sufficient number of pulses to deliver a total energy that provides the heat treatment of the tissues, the device being characterized in that it includes means (30, 40) for adjusting the number and the duration of the pulses, said means enabling at least two pulse sequence groups to be emitted: a first pulse sequence group delivering about 70% to 80% of the total energy, and a second pulse sequence group delivering 30% to 20% of the total energy. The invention makes it possible to shorten the total time required for heat treatment of tissues.
Claims14
A method for heat treating biological tissue, comprising the steps of:
- (a) illuminating a localized region of the tissue with a sequence of laser pulses in sufficient number to deliver a total amount of energy that causes said heat treatment to be performed at said localized region, said sequence comprising:
- a first group of laser pulses delivering 70% to 80% of the total energy of the pulse sequence, each pulse in said first group having a duration not greater than 200 ms and each delivering an amount of energy in the range from 10 J to 100 J, and
- a second group delivering 20% to 30% of the total energy of the sequence, consisting of pulses each having an energy in the range from 2 J to 40 J,
- the duration of any one of the pulses in the second group being lesser than the duration of any one of the pulses in the first group;
- and
- (b) repeating step (a) for illuminating another localized region of the biological tissue to be treated.
A device for heat treating biological tissue, comprising:
- a laser provided with means for causing it to generate a beam of light energy;
- a control means coupled to said laser for controlling delivery of light energy by said laser in the form of successive sequences of pulses;
- manually operated means for initiating and stopping operation of said device;
- and
- memory means in said control unit, for storing a plurality of predetermined instructions each identifying a pulse duration, a pulse energy and a spacing between pulses of a respective group of laser pulses;
- means for selection of groups within said memory, said control means causing said laser to deliver successive sequences each consisting of a first one of said groups and second one of said groups, wherein the pulses in the first group deliver 70% to 80% of the total energy of the pulse sequence, each pulse in said first group having a duration not greater than 200 ms and delivering an amount of energy in the range from 10 J to 100 J, and the pulses in the second group deliver 20% to 30% of the total energy of the sequence and consist of pulses each having an energy in the range from 2 J to 40 J, the duration of any one of the pulses in the second group being lesser than the duration of any one of the pulses in the first group.
Dependencies are inferred from the claim text.