CN-115666463-B - Pupil dilator

Abstract

The invention provides a pupil expander, which can expand the pupil simply and safely without damaging intraocular tissues such as iris. A pupil expander 1 for expanding a pupil in an ophthalmic operation is provided with a ring portion 10 formed in an annular shape and an iris locking portion 20 provided on the ring portion 10. The ring portion 10 is alternately provided with a first ring portion 11 formed to be recessed inward in the radial direction and a second ring portion 12 formed to be bulged outward in the radial direction in the circumferential direction, and the first ring portion 11 is provided with an iris locking portion 20, and the iris locking portion 20 is locked to the pupil margin of the iris in a state in which the first ring portion 11 and the second ring portion 12 are arranged on the surface side of the iris.

Inventors

• Manpu Chunjie
• HAGA ZENKU

Assignees

• 株式会社明日视界

Dates

Publication Date

20260512

Application Date

20210624

Priority Date

20200626

Claims (11)

1. 1. A pupil expander for expanding pupils in ophthalmic surgery, characterized in that, The pupil expander comprises an annular ring part and an iris locking part arranged on the ring part, The ring part is alternately provided with a first ring part formed in a shape recessed inward in the radial direction and a second ring part formed in a shape bulged outward in the radial direction along the circumferential direction, the first ring part is provided with the iris locking part, and the iris locking part is locked at the pupil edge of the iris in a shape in which the first ring part and the second ring part are arranged on the surface side of the iris, The first ring portion and the second ring portion are formed of elastically deformable members, When the iris locking portion is locked to the pupil edge of the iris, if an external force is applied to the first ring portion toward the radially inner side, the first ring portion is deformed so as to be further recessed toward the radially inner side, and the second ring portion adjacent to the first ring portion is deformed so as to increase the curvature toward the radially outer side, so that the iris locking portion of the first ring portion is greatly moved toward the inner side, and on the other hand, the movement in the radial direction of the iris locking portion of the first ring portion other than the first ring portion is suppressed.
2. 2. The pupil expander according to claim 1, wherein, in said ring portion, movement of a radially outer side of said iris engagement portion of said first ring portion other than said first ring portion to which said external force acts is suppressed to a movement amount of 70% or less of movement of a radially inner side of said iris engagement portion of said first ring portion to which said external force acts.
3. 3. The pupil expander according to claim 1 wherein said second ring portion is formed of a material that is more radially elastically deformable than said first ring portion.
4. 4. The pupil expander according to claim 1, wherein said second ring portion is formed with a groove portion extending in a thickness direction in an inner peripheral portion.
5. 5. The pupil expander according to claim 1, wherein the iris locking portion is formed in an L-shaped cross section formed by a hanging portion hanging from the first ring portion toward the inside of the eye and an extending portion extending radially outward from the hanging portion, and is locked to the pupil rim of the iris in a state in which the hanging portion is in contact with a side surface of the pupil rim of the iris and the extending portion is in contact with a back surface of the pupil rim of the iris.
6. 6. The pupil expander according to claim 5, wherein said iris engaging portion extends radially outward in a manner such that the extending portion is inclined to one of circumferential directions.
7. 7. The pupil expander according to claim 1, wherein said first ring portion is provided with an instrument hooking portion for hooking medical instruments for ophthalmic surgery.
8. 8. Pupil expander according to claim 1 wherein the first and/or the second ring part is provided with a syringe component hook for hooking a component of a syringe for setting or extracting the pupil expander to or from the pupil.
9. 9. The pupil expander according to claim 1, wherein said first ring portion is inclined to the iris side from a boundary portion connected to the second ring portion toward a portion where said iris engagement portion is provided.
10. 10. The pupil expander according to claim 9 and wherein said second ring portion is inclined to the iris side from a boundary portion connected to said first ring portion toward the central portion.
11. 11. The pupil expander according to claim 1, wherein the first ring portion is formed with a groove portion extending in a thickness direction in an inner peripheral portion or an outer peripheral portion.

Description

Pupil dilator Technical Field The present invention relates to a pupil expander for expanding a pupil in an ophthalmic operation such as cataract operation. Background In general, the human eye has a function of adjusting the amount of light incident from the pupil located in the center of the iris. The iris is an annular tissue behind the cornea and in front of the lens, with its center opening forming the pupil. The iris is composed of loose connective tissue that stretches freely and muscle that dilates or stretches the pupil, and in a bright place, the tissue of the iris progresses centrally to constrict the pupil (miosis), thereby reducing the amount of light incident into the eye, and in a dark place, the tissue of the iris constricts toward its root (peripheral portion of the pupil) to dilate the pupil (miosis), thereby increasing the amount of light incident into the eye. However, among the diseases caused by the human eye, there are diseases called cataracts, which are mainly caused by clouding of the lens due to an increase in age, and decrease in vision. In the current cataract surgery, a circular incision wound of about 5 to 6mm is provided in the center of an anterior capsule in a lens capsule, turbid lens contents are sucked and removed from the incision wound, and an intraocular lens is inserted into the lens capsule from the incision wound. In order to complete the cataract surgery, retinal vitrectomy, and other surgeries of the lens, vitreous body, or retina located in the interior of the eyeball behind the iris, it is necessary to maintain the diameter of the pupil in a dilated (mydriatic) state to a sufficient size (about 5 to 8 mm) during the surgeries. However, in the past, when an eye having inflammation in the iris, an eye in which an eye drop of a miotic drug has been used for a long time for glaucoma, an eye in which a pseudo-desquamation substance has adhered to the iris, or an eye in which the degree of miosis is large in the elderly, there is a case where a mydriatic agent is used before an operation, the pupil cannot be sufficiently dilated. For an eye in which the pupil cannot be sufficiently dilated in this way, an iris retractor having a hooked distal end has been conventionally used (for example, refer to patent document 1 below). In the case of performing an operation using 4 iris retractors, when the iris retractors are installed, 4 incisions are formed in the cornea, and the iris retractors are inserted into the respective incisions at these sites. Then, the front end portion of the iris retractor is caught around the pupil edge, and the pupil edge of the iris is pulled outward in the radial direction, and in this state, each iris retractor is fixed to the cornea using a silicon plug, whereby the diameter of the pupil is maintained in a state of being expanded in a sufficient size. In addition, when the iris retractor is pulled out, the iris retractors are removed after the fixation of the silicon plugs is released. Such iris retractor placement and extraction must be carefully performed so as not to damage the iris, thus requiring considerable labor and time. In particular, since the hook portion for hooking the pupil edge of the iris is formed of a thin resin wire in the iris retractor, there is a concern that the pupil edge of the iris may be ruptured when the pupil edge of the iris is pulled by the iris retractor, and the pupil may be deformed after the operation. In contrast, in recent years, pupil dilators such as Malyugin Ring, the OASIS Iris Expander, and Morcher Pupil Dilator have been known as devices capable of dilating pupils in a shorter time than the iris retractors described above (for example, refer to patent documents 2 to 4 below). These pupil dilators are composed of synthetic resin having high shape memory, and are a member having a quadrangle shape in a natural state or a substantially annular member having 1 part open. These pupil expanders are folded and housed in a special syringe in a slender manner, and inserted into the eye from a small incision wound of about 2.2 to 3.2mm, and inserted into the pupil margin of the iris. Then, the iris locking portion formed at 4 to 5 positions or substantially the whole circumference expands the pupil outward while hooking from the inner side of the pupil edge of the iris. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 7-194643 Patent document 2 Japanese patent application laid-open No. 2010-521229 Patent document 3 Japanese patent laid-open No. 2002-531170 Patent document 4 Japanese patent application laid-open No. 9-505753 Disclosure of Invention Problems to be solved by the invention However, since the conventional pupil expander is composed of a substance having high shape memory, when released from the syringe into the eye, the pupil expander returns to its original shape (shape in a natural state) in the eye. Then, in order to expand the iris in the eye into a quadr