Lens injector lumen tip for wound assisted delivery

0001This invention relates to intraocular lenses (IOLs) and more particularly to cartridges used to inject IOLs into an eye.

Background of the Invention

0002The human eye in its simplest terms functions to provide vision by transmitting and refracting light through a clear outer portion called the cornea, and further focusing the image by way of the lens onto the retina at the back of the eye. The quality of the focused image depends on many factors including the size, shape and length of the eye, and the shape and transparency of the cornea and lens.

0003When trauma, age or disease cause the lens to become less transparent, vision deteriorates because of the diminished light which can be transmitted to the retina. This deficiency in the lens of the eye is medically known as a cataract. The treatment for this condition is surgical removal of the lens and implantation of an artificial lens or IOL.

0004While early IOLs were made from hard plastic, such as polymethylmethacrylate (PMMA), soft, foldable IOLs made from silicone, soft acrylics and hydrogels have become increasingly popular because of the ability to fold or roll these soft lenses and insert them through a smaller incision. Several methods of rolling or folding the lenses are used. One popular method is an injector cartridge that folds the lenses and provides a relatively small diameter lumen through which the lens may be pushed into the eye, usually by a soft tip plunger. The most commonly used injector cartridge design is illustrated in <patcit id="pcit0001" dnum="US4681102A"><text>U.S. Patent No. 4,681,102 (Bartell</text></patcit>), and includes a split, longitudinally hinged cartridge. Similar designs are illustrated in <patcit id="pcit0002" dnum="US5494484A"><text>U.S. Patent Nos. 5,494,484</text></patcit> and <patcit id="pcit0003" dnum="US5499987A"><text>5,499,987 (Feingold</text></patcit>) and <patcit id="pcit0004" dnum="US5616148A"><text>5,616,148</text></patcit> and <patcit id="pcit0005" dnum="US5620450A"><text>5,620,450 (Eagles, et al.</text></patcit>). In an attempt to avoid the claims of <patcit id="pcit0006" dnum="US4681102A"><text>U.S. Patent No. 4,681,102</text></patcit>, several solid cartridges have been investigated, see for example <patcit id="pcit0007" dnum="US5275604A"><text>U.S. Patent No. 5,275,604 (Rheinish, et al.</text></patcit>), <patcit id="pcit0008" dnum="US5653715A"><text>5,653,715 (Reich, et al.</text></patcit>), and <patcit id="pcit0009" dnum="US5947976A"><text>U.S. Patent No. 5,947,976 (Van Noy, et al</text></patcit>).

0005These prior art devices were intended to inject an IOL into the posterior chamber of an aphakic eye through a relatively large (approximately 3.0 mm or larger) incision. Surgical techniques and IOLs have been developed that allow the entire surgical procedure to be performed through much smaller incisions, 2.4 mm and smaller. As a result, surgeons began developing methods of wound assisted IOL insertion, where the IOL is delivered through a small incision without inserting the cartridge tip fully into the wound. In this type of IOL delivery, the wound itself provides a tunnel through which the IOL enters the anterior chamber. Wound assisted IOL delivery, therefore, eliminates the need for the incision to be large enough to accommodate the outer diameter of the cartridge tip, allowing a smaller incision to be used. Prior to the present invention, such wound assisted delivery was accomplished using techniques which are highly reliant on the degree of skill and confidence of the surgeon.

0006Accordingly, a need continues to exist for an intraocular lens injection cartridge which provides features to specifically aid in wound assisted IOL delivery.

Brief Summary of the Invention

0007The present invention improves upon prior art by providing a cartridge for an IOL delivery system that includes an extended canopy at the distal tip of the cartridge to open and support the wound while guiding and controlling the folded lens as it passes through the wound, and a peripheral protrusion, flange, or stop feature that provides an insertion depth limitation and prevention of full insertion of the cartridge tip, in accordance with claims which follow. In addition, the protrusion provides support to the incision to reduce the tendency of wound damage through tearing.

0008It is accordingly an objective of the present invention to provide a cartridge for a lens delivery system that has an extended canopy at the distal tip.

0009It is a further objective of the present invention to provide a cartridge for a lens delivery system that contains a peripheral protrusion, flange, or stop that provides an insertion depth limitation.

0010It is yet a further objective of the present invention to provide a cartridge for a lens delivery system that contains a peripheral protrusion, flange, or stop that provides support to the incision to reduce the tendency of wound damage through tearing.

0011Other objectives, features and advantages of the present invention will become apparent with reference to the drawings, and the following description of the drawings and claims.

Brief Description of the Drawings

0012<ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001">FIG. 1</figref> is an enlarged top perspective view of the lens delivery system cartridge of the present invention.</li><li><figref idref="f0002">FIG. 2</figref> is an enlarged front partial perspective view of a first embodiment of the distal tip of the lens delivery system cartridge of the present invention.</li><li><figref idref="f0003">FIG. 3</figref> is an enlarged side elevational view of a first embodiment of the distal tip of the lens delivery system cartridge of the present invention.</li><li><figref idref="f0004">FIG. 4</figref> is an enlarged front partial perspective view of a second embodiment of the distal tip of the lens delivery system cartridge of the present invention.</li><li><figref idref="f0004">FIG. 5</figref> is an enlarged front elevational view of a third embodiment of the distal tip of the lens delivery system cartridge of the present invention.</li><li><figref idref="f0005">FIG. 6</figref> is an enlarged side elevational view of the lens delivery system cartridge inserted into an incision in an eye.</li></ul>

Detailed Description of the Preferred Embodiments

0013As best seen in <figref idref="f0001">FIG. 1</figref>, lens cartridge 10 of the present invention generally includes body 12 and nozzle 14. Cartridge 10 can be molded from any suitable thermoplastic, such as polypropylene, and the thermoplastic may contain a lubricity enhancing agent such as those disclosed in <patcit id="pcit0010" dnum="US5716364A"><text>U.S. Pat. No. 5,716,364</text></patcit>. Nozzle 14 may be integrally formed with body 12. Nozzle 14 includes distal tip 16. Body 12 contains bore or lumen 15. Prior to use, IOL 13 is initially positioned within lumen 15 of body 12.

0014As best seen in <figref idref="f0002 f0003">FIGS. 2-3</figref>, distal tip 16 includes opening 18, canopy 20, and peripheral protrusion 22. Canopy 20 extends from distal tip 16 and functions to open the wound prior to IOL 13 insertion. In addition, upper portion 21 of canopy 20 provides support for the folded IOL 13 during wound assisted delivery. In a preferred embodiment, illustrated in <figref idref="f0002">FIGS. 2</figref> and <figref idref="f0003">3</figref>, canopy 20 completely encircles opening 18. In this embodiment, canopy 20 gradually tapers from its maximum length of between approximately 1.5 millimeters to 2.4 millimeters (preferably about 1.9 millimeters) at approximately 12 o'clock position 32 to flush with opening 18 at approximately 6 o'clock position 34. In a second embodiment, shown in <figref idref="f0004">FIG. 4</figref>, canopy 20' only partially encircles opening 18' from approximately 10 o'clock position 24 to approximately 2 o'clock position 26. Similarly to canopy 20, canopy 20' gradually tapers from a 5 maximum length of between approximately 1.5 millimeters to 2.4 millimeters (and preferably about 1.9 millimeters), at position 27, to flush with opening 18' at approximately 10 o'clock position 24 and approximately 2 o'clock position 26. In a third embodiment, shown in <figref idref="f0004">FIG. 5</figref>, canopy 20" substantially encircles opening 18" from approximately 9 o'clock position 28 to approximately 3 o'clock position 30. In this embodiment, canopy 20" also gradually tapers from a maximum length of between approximately 1.5 millimeters to 2.4 millimeters (also preferably about 1.9 millimeters), at position 25, to flush with opening 18" at approximately 9 o'clock position 28 and approximately 3 o'clock position 30.

0015Peripheral protrusion 22 may be any feature appropriate for preventing distal tip16 from fully entering an incision, such as a flange or stop. Peripheral protrusion 22 extends laterally from outer wall 36 of distal tip 16, and may be a continuous protrusion that completely encircles nozzle 14. However, peripheral protrusion 22 may not be continuous and most preferably comprise a plurality of protrusions 22 that extend, for example, laterally from either side of outer wall 36 of distal tip 16. Peripheral protrusion 22 serves as an insertion depth limitation, and prevents the full insertion of distal tip 16 into the wound entrance. Distal face 23, of peripheral protrusion 22 may be square or sloped at an angle of between approximately 18 to 26 degrees (preferably about 22 degrees). Such a slope will allow a more contoured contact with the surface of the eye and provide for less tissue irritation because cartridge 10 generally is held at an angle to eye 52 during use, as seen in <figref idref="f0005">FIG. 6</figref>. Both canopy 20 and peripheral protrusion 22 may be integrally formed with distal tip 16 and nozzle 14.

0016During operation, shown in <figref idref="f0005">FIG. 6</figref>, the surgeon makes incision 50 in of eye 52. Canopy 20 is inserted into incision 50 to such a depth where peripheral protrusion 22 contacts the surface of eye 52 and prevents further insertion. Upper portion 21 of canopy 20 holds incision 50 open and supports IOL 13 as it is moved through opening 18, through incision 50, and inserted into eye 52.

0017While certain embodiments of the present invention have been described above, these descriptions are given for purposes of illustration and explanation. Variations, changes, modifications and departures from the systems and methods disclosed above may be adopted without departure from the scope of the present invention.