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 hollow shell formed of a rigid material and defining an interior space, the shell having an upper rim and a lower portion;
a transparent applanation lens disposed inside of and mounted to the lower portion of the hollow shell; and
a flexible skirt having a circular shape, the flexible skirt being affixed to and extending downwardly from a lower end of the lower portion of the shell, wherein a lower rim of the flexible skirt is located below the applanation lens,
wherein the lower portion of the shell defines one or more through channels in a region between the applanation lens and a side wall of the lower portion, wherein each of the one or more through channels is open to and in air communication with both the interior space of the shell above the applanation lens and a space which is located below the applanation lens and encircled by the flexible skirt, wherein each of the one or more through channels is configured to communicate a vacuum to secure the patient interface device to the ophthalmic surgical laser system and to the eye.
2. The patient interface device of claim 1 , wherein the upper rim of the shell includes a flexible material.
3. The patient interface device of claim 2 , wherein the flexible material of the upper rim is a compliant natural or synthetic polymer.
4. The patient interface device of claim 1 , wherein the flexible skirt is made of a compliant natural or synthetic polymer.
5. The patient interface device of claim 1 , wherein the lower portion of the shell has a shape of an upside-down truncated cone.
6. The patient interface device of claim 5 , wherein the shell further includes an upper portion, wherein an upper rim of the upper portion is the upper rim of the shell, and wherein the lower portion of the shell extends downwardly from the upper portion.
7. The patient interface device of claim 6 , further comprising a magnet or a piece of material that is attracted to magnets, affixed to the upper portion of the shell.
8. The patient interface device of claim 1 , wherein the shell includes a magnet or a piece of material that is attracted to magnets.