US4991567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro-iris retractor
Assignee: Duke University
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Filing: 1990-01-16
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Granted: 1991-02-12
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Expires: 2010-01-16
Abstract
Abstract This invention concerns the use of stainless steel, disposable tacks to be employed in the mechanical dilation of the iris during opthalmic surgery. Intended for temporary iris fixation, the tack is provided with a hook built onto its proximal end, and with a sharp anterior blade at its distal end. The anterior blade allows easy insertion of the tack through the peripheral cornea of the eye, at the limbal area, and an applicator is provided with a forked holder to firmly grasp the hook in securely placing and removing the tack in the surgical procedure.
Inventors
- 👤 II Brooks W. McCuen
- 👤 Dyson Hickingbotham
- 👤 Eugene de Juan, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61B; A61B17/00; A61B17/02; A61B17/0231; A61B17/00234; A61B2017/00349; A61B2017/0046; A61B2017/00473
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
Apparatus affording pupillary dilation for intraocular surgery, comprising: a tack for temporarily securing the iris in place during a surgical procedure; and an applicator, manually adjustable for grasping said tack and for releasing said tack, in the insertion of said tack into position and in its removal, as the case may be; and with said tack having an anterior blade and a bearing projection at a distal end, forming a meridian therebetween in which the iris is held in place when said tack is inserted into position in the eye.
Claim 2
Dependent Claim
90 words
Apparatus affording pupillary dilation for intraocular surgery, comprising: a tack for temporarily securing the iris in place during a surgical procedure; and an applicator, manually adjustable for grasping said tack and for releasing said tack, in the insertion of said tack into position and in its removal, as the case may be; and with said tack having an anterior blade and a bearing projection at a distal end, forming a meridian therebetween in which the iris is held in place when said tack is inserted into position in the eye.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 wherein said tack has an anterior blade, sharpened to facilitate insertion of said tack into the eye.
Claim 4
Dependent Claim
23 words
The apparatus of claim 1 wherein said applicator includes a lever, finger actuated to manually grasp said tack when said lever is released.
Claim 5
Dependent Claim
31 words
The apparatus of claim 1 wherein said tack includes an eyelet at a proximal end, grasped and released by said applicator in the insertion and removal of said tack when positioned.
Claim 6
Dependent Claim
25 words
The apparatus of claim 4 wherein said applicator includes a springloaded hook to manually grasp said eyelet in the insertion and removal of said tack.
Claim 7
Dependent Claim
44 words
The apparatus of claim 4 wherein said tack is fabricated of a continuous length of hardened metal, looped so as to form said eyelet and so that said anterior blade and bearing projection are formed and from the opposite ends of said continuous length.
Claim 8
Dependent Claim
25 words
The apparatus of claim 6 wherein said anterior blade extends a further distance towards the distal end of said tack than does said bearing projection.
Claim 9
Dependent Claim
31 words
The apparatus of claim 7 wherein said anterior blade is formed to a point to facilitate insertion into the eye, and wherein said bearing projection is formed of a rounded edge.
Claim 10
Dependent Claim
13 words
The apparatus of claim 6 wherein said tack is fabricated of stainless steel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |