Flash vaporization surgical systems
AssigneePrecise Light Surgical, Inc.
InventorsGerald Mitchell, Kenneth Arnold
Life of this patent
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Abstract
A laser can produce pulses of light energy to eject a volume of the tissue, and the energy can be delivered to a treatment site through a waveguide, such as a fiber optic waveguide. The incident laser energy can be absorbed within a volume of the target tissue with a tissue penetration depth and pulse direction such that the propagation of the energy from the tissue volume is inhibited and such that the target tissue within the volume reaches the spinodal threshold of decomposition and ejects the volume, for example without substantial damage to tissue adjacent the ejected volume.
Claims21
A system for treating tissue, the system comprising:
- a laser to generate a laser beam;
- a controller which controls the laser in response to parameters including pulse length and pulse energy;
- and
- a user interface connected to controller, said interface comprising a user selectable adjustment to select first and second modes;
- wherein the controller adjusts the laser to operate successively in the first mode with a first set of adjustable parameters and the second mode with a second set of adjustable parameters, and wherein the controller causes dynamic transition between the first and second modes during an exposure;
- and
- a beam delivery device coupled to the laser to deliver the laser beam to target tissue during the exposure;
- wherein the controller controls both a q-switch and a pump source, and the first set of parameters includes a first set of q-switch parameters and a first set of pump pulse parameters which cause generation of one or more pulses each having both a pulse width between 1 ns and 500 ns and a fluence at the treatment site between 5 J/cm2 and 500 J/cm2 and the second set of parameters includes a second set of q-switch parameters and a second set of pump pulse parameters, wherein the q-switch is in the off mode, which cause generation of an average irradiance at a treatment site between 500 W/cm2 and 1 MW/cm2.
A system for treating tissue, the system comprising:
- a laser to generate a laser beam;
- a controller which controls the laser in response to parameters including pulse length and pulse energy;
- and
- a user interface connected to controller, said interface comprising a user selectable adjustment to select first and second modes;
- wherein the controller adjusts the laser to operate successively in the first mode with a first set of adjustable parameters and the second mode with a second set of adjustable parameters, and wherein the controller causes dynamic transition between the first and second modes during an exposure;
- and
- a beam delivery device coupled to the laser to deliver the laser beam to target tissue during the exposure;
- wherein the controller controls both a q-switch and a pump source, and the first set of parameters includes a first set of q-switch parameters and a first set of pump pulse parameters generating one or more pulses each having both a pulse width between 1 ns and 500 ns and a fluence at a treatment site between 5 J/cm2 and 500 J/cm2, and the second set of parameters includes a second set of q-switch parameters and a second set of pump pulse parameters with one or more pulses each having both a pulse width of at least 1.2× greater than the pulse width of the first mode and a fluence at a treatment site of at least 0.8× less than the fluence at the treatment site of the first mode.
Dependencies are inferred from the claim text.