Patient interface for ophthalmologic diagnostic and interventional procedures
One embodiment is directed to a method for interfacing an ophthalmic intervention system with an eye of a patient, comprising: placing a patient interface assembly comprising a housing, an optical lens coupled to the housing, and an eye engagement assembly coupled to the housing, the eye engagement assembly comprising an inner seal and an outer seal, into contact with the eye of the patient by sealably engaging the eye with the inner and outer seals in a vacuum zone defined between the inner and outer seals; applying a vacuum load between the inner and outer seals to engage the eye using the vacuum load; and physically limiting an amount of distension of the eye in the vacuum zone.
1. A laser ophthalmic surgical system comprising:
a laser system configured to produce a treatment beam;
an imaging device;
a scanning assembly configured to deflect a focal point of the treatment beam;
a patient interface assembly comprising a patient interface housing and one or more registration fiducials coupled to the patient interface housing in a predetermined geometric configuration relative to the patient interface housing, the patient interface housing comprising a distal end for coupling to one or more surfaces of the eye of the patient, and a proximal end opposite the distal end, the patient interface housing arranged such that a field of view of the imaging device passes through a passage of the patient interface housing defined by the proximal and distal ends; and
control electronics operatively coupled to the laser system, the imaging device, and the scanning assembly, the control electronics programmed to:
successively image the one or more registration fiducials and predetermined geometric markers on the eye of the patient using the imaging device; and
process successive imaging data generated via the imaging device so as to determine a successive position in X, Y, and Z, together with a successive pitch, yaw, and roll of the patient interface housing.
2. The laser ophthalmic surgical system claim 1 , wherein the controller is programmed to control the scanning assembly to direct the treatment beam through the passage of the patient interface housing and into the eye of the patient.
3. The laser ophthalmic surgical system claim 2 , wherein the treatment beam is suitable for creating dielectric breakdown within a cataractous crystalline lens of the eye.
4. The laser ophthalmic surgical system claim 3 , wherein the treatment beam is a pulsed treatment beam with a pulse repetition rate between about 1 kHz and about 200 kHz.
5. The laser ophthalmic surgical system claim 3 , wherein the treatment beam has a wavelength between about 800 nm and about 1,100 nm.
6. The laser ophthalmic surgical system claim 3 , wherein the treatment beam is a pulsed treatment beam having a pulse energy between about 1 microjoule and about 1,000 microjoules.
7. The laser ophthalmic surgical system claim 3 , wherein the treatment beam is a pulsed treatment beam with a pulse duration between about 100 femtoseconds and about 10 picoseconds.
8. The laser ophthalmic surgical system claim 1 , wherein the patient interface housing comprises an optical lens coupled to the housing having a focal axis aligned to pass through the passage of the housing.
9. The laser ophthalmic surgical system claim 1 , wherein the imaging device comprises an optical coherence tomography system configured to measure the coherence of radiation scattered into an interferometer from the field of view.
10. The laser ophthalmic surgical system claim 1 , wherein the one or more fiducials comprise one or more materials that fluoresce in infrared radiation.
11. The laser ophthalmic surgical system claim 1 , wherein the one ore more fiducials comprise one or more materials that highly contrast in infrared radiation relative to other surrounding materials.
12. The laser ophthalmic surgical system claim 1 , wherein the one or more fiducials comprise one or more surface irregularities relative to other surrounding surfaces.
13. The laser ophthalmic surgical system claim 1 , wherein the one or more fiducials comprise one or more materials that highly contrast in visible light radiation relative to other surrounding materials.
14. The laser ophthalmic surgical system claim 1 , wherein the fiducials comprise one or more surface irregularities relative to other surrounding surfaces.
15. The laser ophthalmic surgical system claim 1 , wherein the one or more fiducials are positioned upon an inner annulus formed by the distal end of the patient interface housing.
16. The laser ophthalmic surgical system claim 15 , wherein a first and a second fiducials are positioned at opposite sides of the inner annulus.
17. The laser ophthalmic surgical system claim 15 , wherein three fiducials are distributed nonhomogeneously about the inner annulus.