Surgical toroidal snare
First Claim
1. A surgical instrument for seating an intraocular lens in the posterior capsule of an eye and comprising:
- a longitudinally extending hollow shank having a body and a tip portion;
flexible band means forming a loop extending forwardly of said tip portion for embracing the intraocular lens,said shank tip portion having a generally S-shape to allow said tip portion to curl around the iris of the eye to position said loop with the intraocular lens held therein inside the posterior capsule in a plane generally parallel to the posterior wall of the capsule; and
support means displaceable within said hollow shank and connected to said band means;
said displaceable support means having in said hollow shank a forward position in which said loop is larger than the lens to be held therein, an intermediate position in which said loop snugly retains the lens, and a rearward position in which said band means releases the lens to enable withdrawal of said band means from the eye without disturbing the seating of the lens in the posterior capsule of the eye.
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Accused Products
Abstract
A surgical instrument for seating an intraocular lens in the posterior capsule of an eye in place of a removed cataracted natural lens includes a longitudinally extending shank and a band attached to the shank and forming a closed loop. The loop extends outwardly of the S-shaped tip portion of the shank for holding the intraocular lens in a plane which is generally parallel to and laterally displaced from the longitudinal axis of the shank. The band has a first end connected with the shank for movement therewith, and a second end connected to a support member located in the shank for movement therewith and relative thereto. The member, when displaced in the shank bore relative to the shank, tears the band, breaking the loop. Thereby, upon withdrawal of the instrument from the eye, the band is withdrawn together with the instrument without disturbing the seating of the intraocular lens in the posterior capsule.
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Citations
12 Claims
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1. A surgical instrument for seating an intraocular lens in the posterior capsule of an eye and comprising:
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a longitudinally extending hollow shank having a body and a tip portion; flexible band means forming a loop extending forwardly of said tip portion for embracing the intraocular lens, said shank tip portion having a generally S-shape to allow said tip portion to curl around the iris of the eye to position said loop with the intraocular lens held therein inside the posterior capsule in a plane generally parallel to the posterior wall of the capsule; and support means displaceable within said hollow shank and connected to said band means; said displaceable support means having in said hollow shank a forward position in which said loop is larger than the lens to be held therein, an intermediate position in which said loop snugly retains the lens, and a rearward position in which said band means releases the lens to enable withdrawal of said band means from the eye without disturbing the seating of the lens in the posterior capsule of the eye. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A surgical instrument for seating an intraocular lens in the posterior capsule of an eye, said instrument comprising:
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a longitudinally extending hollow shank having a tip portion; flexible band means forming a loop extending forwardly of said tip portion for embracing the intraocular lens; said tip portion having a generally S-shape to allow said tip portion to curl around the iris of the eye to position said loop with the intraocular lens held therein inside the posterior capsule in a plane generally parallel to the posterior wall of the capsule; and support means connected to said band means and displaceable in said hollow shank relative thereto to provide for release of the lens by said loop to enable withdrawal of said band means from the eye without disturbing the seating of the intraocular lens in the posterior capsule of the eye. - View Dependent Claims (9, 10)
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11. A method of inserting an intraocular lens into the posterior capsule of an eye with a surgical instrument for holding the intraocular lens and having a longitudinally extending hollow shank having a generally S-shaped tip portion, and band means attached to said shank and forming a loop extending forwardly of said tip portion for embracing the intraocular lens, said method comprising the steps of:
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inserting the surgical instrument with the intraocular lens held in said loop through an incision made in the cornea of the eye and positioning said loop with the intraocular lens held therein inside the posterior capsule in a plane generally parallel to the posterior wall of the capsule, the S-shape of the tip portion allowing the shank to clear the iris of the eye when said loop is positioned in the plane generally parallel to the posterior wall of the capsule; breaking the loop to release the lens and enable withdrawal of the band means from the eye without disturbing the seating of the lens in the posterior capsule of the eye; and thereafter, withdrawing the surgical instrument from the eye.
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12. A surgical instrument for seating an intraocular lens in the posterior capsule of an eye and comprising:
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a longitudinally extending hollow shank having a tip portion; flexible band means forming a loop extending forwardly of said tip portion for embracing the intraocular lens, said shank tip portion having a generally S-shape to allow said tip portion to curl around the iris of the eye to position said loop with the intraocular lens held therein inside the posterior capsule in a plane generally parallel to the posterior wall of the capsule; and support means displaceable within said hollow shank and connected to said band means; said displaceable support means having in said hollow shank a forward position in which said loop is larger than the lens to be held therein, and an intermediate position in which said loop snugly retains the lens, and a means associated with said bank means for severing the latter so as to release the lens and to enable withdrawal of said band means from the eye without disturbing the seating of the lens in the posterior capsule of the eye.
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Specification