Device and method for laser assisted deep sclerectomy
An ophthalmic laser ablation system is described with various optional features, some especially suitable for non-penetrating filtration on an eye. In one example, focusing of an ablation laser uses a movable lens coupled to a pair of converging light sources, which converge at the focal distance of the lens. In another example, laser ablation settings are selected for optimal ablation and minimal amount of thermal damage of a layer of percolating scleral tissue.
1. A laser control system, comprising:
a scanner housing, wherein the scanner housing comprises:
a focusing lens;
at least two light sources disposed symmetrically with respect to an optical axis of the focusing lens, wherein the at least two light sources generate two converging beams toward a focal plane of the focusing lens;
a beam reflecting element positioned on the optical axis and on a first side of the focusing lens; and
a laser port at one end of the scanner housing, wherein the laser port is positioned on the optical axis and on the first side of the focusing lens; and
a ring-shaped frame having an opening side coupled to the scanner housing on a second side of the focusing lens, wherein the ring-shaped frame comprises:
a folding mirror mounted at the opening side of the ring-shaped frame, wherein the folding mirror is configured to control a direction of the two converging beams;
at least one mechanism;
wherein the at least one mechanism is operatively connected to the folding mirror;
wherein the at least one mechanism is configured to adjust a position and an orientation of the folding mirror;
a plurality of protrusions disposed on the ring-shaped frame;
wherein the plurality of protrusions are operatively connected to an adaptor which couples the ring-shaped frame with a microscope; and
wherein the plurality of protrusions are configured to adjust a position and a rotation of the ring-shaped frame relative to the microscope; and
wherein the plurality of protrusions comprise:
at least one first protrusion configured to lock the ring-shaped frame to the adapter, and
at least one second protrusion configured to allow the rotation of the ring-shaped frame around an axis of the microscope and lock a rotation position of the ring-shaped frame.
2. The system of claim 1 , wherein the beam reflecting element comprises two perpendicular mirrors, each of the two perpendicular mirrors mounted on an actuator.
3. The system of claim 2 , wherein the actuators are driven by electronic signals creating a scanner pattern.
4. The system of claim 1 , wherein the laser port is configured to receive input from an ablation laser.
5. The system of claim 1 , wherein the scanner housing further includes a displacement element detachably coupled to the focusing lens, the displacement element configured to control a distance between the focusing lens and the folding mirror.
6. The system of claim 5 , wherein the displacement element further comprises a micrometer moving the focusing lens towards or away from the folding mirror along the optical axis adjusting the focal location of the focusing lens.
7. The system of claim 1 , wherein the folding mirror is configured to be transparent to most wavelengths of visible light and configured to reflect both ablation wavelengths and patterned light.
8. The system of claim 1 , wherein the plurality of protrusions are configured to positioned at points on the ring-shaped ring defining a geometric shape symmetric with respect to the optical axis of the focusing lens, and the symmetric geometric shape has a minimum diameter smaller than that of a lip of the adaptor.