Patient interface device for ophthalmic surgical laser system
Apparatus and method for interfacing an ophthalmic surgical laser system with a patient's eye using a single-piece patient interface (PI). The PI includes a hollow shell, with an applanation lens and a flexible skirt at its lower end. Through channels are formed around the applanation lens to connect the spaces above and below the lens. When the PI is coupled to the laser system and the eye, the upper rim of the shell forms a seal with the laser system and the flexible skirt forms a seal with the eye. A vacuum is applied to the interior of the shell via a vacuum port on the laser system, and the vacuum is communicated to the space enclosed by the applanation lens, the skirt and the eye through the channels around the lens. A magnetic mechanism is also provided to hold the PI shell to the laser system.
1. A patient interface device for coupling an eye of a patient to an ophthalmic surgical laser system, comprising:
a shell formed of a rigid material and defining an interior space, wherein the shell has an upper end defining an upper opening between the interior space and an exterior of the shell, and a lower end defining a lower opening between the interior space and the exterior of the shell, and is free of any other openings between the interior space and the exterior of the shell or any fluid conduit attached to the shell;
a transparent applanation lens mounted to the shell and disposed inside the shell adjacent to the lower opening;
a flexible seal affixed to and extending upwardly from the upper end of the shell, the flexible seal extending along an entire circumference of the upper opening of the shell and is configured to couple to the ophthalmic surgical laser system to form an air-tight seal between the ophthalmic surgical laser system and the patient interface around the upper opening; and
a flexible skirt affixed to and extending downwardly from the lower end of the shell, the flexible skirt extending along an entire circumference of the lower opening of the shell and is configured to couple to the eye of the patient to form an air-tight seal between the eye and the patient interface around the lower opening.
2. The patient interface device of claim 1 , wherein the flexible seal is made of a compliant natural or synthetic polymer.
3. The patient interface device of claim 1 , wherein the flexible skirt is made of a compliant natural or synthetic polymer.
4. The patient interface device of claim 1 , wherein the shell has a lower portion having a shape of an upside-down truncated cone.
5. The patient interface device of claim 1 , wherein the shell includes a magnet or a piece of material that is attracted to magnets.