Patent Grant
7621278
The invention relates generally to ophthalmology. More particularly, the invention relates to an eye drape for reducing the incidence of eye infection following surgery.
Drapes can be useful during examination or surgery on various parts of the body. The drapes give the healthcare provider access for examination. In case of a surgery, the drapes give the surgeon access to the surgical field while generally isolating that part of the body from other body parts. Accordingly, drapes usually help reduce the chances of infection occurring after examination or surgery.
Draping the human eye is, however, particularly difficult due in part to the small size and intricate structure of the human eye. Laying a drape sheet over the eye and providing an access opening therein still leaves the eyelids in the surgical field. Generally it is desirable to retract the eyelids to provide greater access to the eyeball. It is also desirable to remove the eyelids and eyelashes from the surgical field. Examples of such drapes are disclosed in U.S. Pat. Nos. 5,632,284, 5,213,114 and 6,675,805. However, these drapes do not prevent bacteria from the majority of the bulbar conjunctiva from entering the eye.
Sterilization of the conjunctiva could be used, however, the nature of the conjunctiva makes it difficult to sterilize before surgery. The peripheral conjunctiva, including the fornices, the caruncle, and the lining inside of the lids, has many crypts and folds not reached by antiseptic solutions.
Accordingly, it would be considered an advance in the art to provide new eye drapes that cover the conjunctiva and therewith reduce the incidence of eye infection following eye examination or surgery.
The present invention provides new eye drapes that cover the conjunctiva and therewith reduce the incidence of eye infection following eye examination or surgery. The eye drape is a combination of a flexible material and a surgical drape attached to the flexible material. The flexible material has a circular shape with a central opening through which an eye examination or surgery can be conducted. The central opening has a diameter large enough to expose the cornea of the eye. The outer diameter of the flexible material is large enough to conveniently fit over the ball of the eye. The flexible material preferably has a curvature that is convex or slightly convex relative to the curvature of the eye.
The surgical drape has an opening greater than or equal to the inner diameter of the flexible material and smaller than or equal to the outer diameter of the flexible material. The size of the surgical drape is large enough to cover at least the area around the eye.
The flexible material distinguishes two positions. The first position of the flexible material has a curvature that is convex relative to the curvature of the eye. The flexible material is placed over the eye in the first position such that a pocket of air is created in between the space of the flexible material and the eye. In the second position of the flexible material the convexity of the curvature is reduced relative to the curvature of the eye. The flexible material is fixed to the eye through a vacuum force caused by air expelled from the pocket.
The flexible material could have a chamber with a plurality of openings at the bottom. In this case, the chamber in the first position of the flexible material contains air, which is expelled from the chamber via some or all of the openings. The flexible material is fixed to the eye through a vacuum force caused by air expelled from the chamber.
The flexible material could further have at least one opening at the top site or its lateral site that is in contact with the chamber. The opening is connected to an air suction device capable of expelling air from the chamber and changing the position of the flexible material from its first position to its second position.
The objectives and advantages of the invention will be understood by reading the following detailed description in conjunction with the drawings, in which:
The key idea of the eye drape of the present invention is to reduce the incidence of an eye infection following an examination or a surgery of an eye.
Flexible material 110 has a substantially circular shape as shown by 102 and includes a central opening with an inner diameter 112 through which an eye examination or eye surgery can be conducted. In one example inner diameter 112 is large enough to expose the cornea 130 of the eye. Examples of reasonable inner diameters range from about 13 to about 16 mm. Flexible material 110 has an outer diameter 114 large enough to conveniently fit over the ball 132 of the eye. Examples of reasonable outer diameters range from about 25 to about 30 mm. The thickness of flexible material 110 is about 1 to 4 mm, and should be thin enough so as not to impede the surgical instruments during the operation. In a variation a ridge is added to the top (away from the eye) of the flexible material to enhance the watertight barrier function.
Surgical drape 120 is attached to flexible material 110. It has an opening 122 greater than or equal to inner diameter 112 of the flexible material and smaller than or equal to outer diameter 114 of flexible material as shown in
Flexible material 110 has a first position in which it has a curvature that is convex relative to the curvature of the eye (See side view 100 in
In this example, flexible material 310 has a first position 304. The bottom of flexible material could have a curvature 320 that is convex relative to the curvature of the eye, which is preferred, but not required. The flexible material 310 is placed over the eye (e.g. exposing the cornea through the central opening) in this first position whereby the chamber contains air. Flexible material has a second position shown by 306 after being pressed 330 down onto the ball of the eye. Flexible material 310 is fixed to the eye through a vacuum force caused by the air expelled which is expelled from the chamber through some or all of the openings. In case the bottom curvature was convex, the convexity is reduced relative to the curvature of the eye due to the vacuum force. Removal of the flexible material in this example is similar as to the first embodiment and can be accomplished by pulling the surgical drape away from the eye, pealing (part of) the flexible material from the eye, or combination thereof.
In one example the suction device is a syringe connected to the hole of the flexible material by a flexible tube. A vacuum is created between the flexible material and the conjunctiva when the syringe is pulled back. The vacuum could then be maintained by closing off the tube with a pinch valve or stopcock. In another example, more sophisticated vacuum pumps or suction devices could be used.
The present invention has now been described in accordance with several exemplary embodiments, which are intended to be illustrative in all aspects, rather than restrictive. Thus, the present invention is capable of many variations in detailed implementation, which may be derived from the description contained herein by a person of ordinary skill in the art. All such variations are considered to be within the scope and spirit of the present invention as defined by the following claims and their legal equivalents.
This application is cross-referenced to and claims benefit from U.S. Provisional Application 60/624,220 filed Nov. 1, 2004, which is hereby incorporated by reference.
| Number | Name | Date | Kind |
|---|---|---|---|
| 5213114 | Bailey, Jr. | May 1993 | A |
| 5632284 | Graether | May 1997 | A |
| 6269815 | Jascomb | Aug 2001 | B1 |
| 6675805 | Graether | Jan 2004 | B1 |
| 20020108615 | Levitt et al. | Aug 2002 | A1 |
| 20060124139 | Morris | Jun 2006 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| 20060102187 A1 | May 2006 | US |
| Number | Date | Country | |
|---|---|---|---|
| 60624220 | Nov 2004 | US |
