US5000751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for laser surgery and particularly for the keratotomy of the cornea (III)
Assignee: Aesculap AG
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Filing: 1989-09-13
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Granted: 1991-03-19
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Expires: 2009-09-13
Abstract
Abstract An apparatus for laser surgery, particularly of the cornea is provided. Through this apparatus, a laser, especially a UV-laser, can be imaged on the tissue undergoing the operation. A diaphragm is arranged in the optical path of the laser and defines the illuminated region of the tissue. The diaphragm includes a slit which has a fixed angular alignment and an adjustable length and width. Further, an optical rotary device is provided which rotates the beam about an optical axis in between the slit and the tissue undergoing the operation.
Inventors
- 👤 Eckhard Schroder
- 👤 Reinhardt Thyzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:47
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/008; A61F9/00802; A61F9/00804; A61F9/00817; A61F2009/00861; A61F2009/00872
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
Eye surgery apparatus for controlling the application of a laser beam on tissue of a cornea to perform keratotomy of the cornea, said apparatus comprising: a slit diaphragm disposable between a laser beam source and a cornea to be operated on, said slit diaphragm including a control slit through which the laser beam passage along an optical device during surgery, and optical rotary means diposed between the slit diaphragm and the cornea for accommodating controlled movement of the laser beam impact position on the cornea, whereby optimum laser beam power can be directed at the diaphragm control slit during surgical operation; and wherein the optical rotary means includes a prism formed from two parts, said prism including an entrance face and an exit face, said entrance face and exit face being at right angles to the optical axis, three reflecting surfaces totally reflecting the beam and having normals forming an angle of 67.5° , 90° , and 125.5° with the optical axis respectively, and two passage faces between the two parts through which the laser beam passes at right angles.
Claim 2
Dependent Claim
180 words
Eye surgery apparatus for controlling the application of a laser beam on tissue of a cornea to perform keratotomy of the cornea, said apparatus comprising: a slit diaphragm disposable between a laser beam source and a cornea to be operated on, said slit diaphragm including a control slit through which the laser beam passage along an optical device during surgery, and optical rotary means diposed between the slit diaphragm and the cornea for accommodating controlled movement of the laser beam impact position on the cornea, whereby optimum laser beam power can be directed at the diaphragm control slit during surgical operation; and wherein the optical rotary means includes a prism formed from two parts, said prism including an entrance face and an exit face, said entrance face and exit face being at right angles to the optical axis, three reflecting surfaces totally reflecting the beam and having normals forming an angle of 67.5° , 90° , and 125.5° with the optical axis respectively, and two passage faces between the two parts through which the laser beam passes at right angles.
Claim 3
Dependent Claim
22 words
Eye surgery apparatus according to claim 1, wherein the control slit has a fixed angular alignment and an adjustable length and width.
Claim 4
Dependent Claim
29 words
Eye surgery apparatus according to claim 1, further including two collecting optical elements which form a telecentric arrangement, said control slit being arranged between said two collecting optical elements.
Claim 5
Dependent Claim
20 words
Eye surgery apparatus according to claim 3, wherein the optical rotary means is arranged between said two collecting optical elements.
Claim 6
Dependent Claim
21 words
Eye surgery apparatus according to claim 1, further including an image-forming means for aligning a visible slit image on the cornea.
Claim 7
Dependent Claim
42 words
Eye surgery apparatus according to claim 5, wherein the image-forming means includes a slit lamp, said slit lamp containing the control slit which simultaneously constitues the central slit for the laser beam and a visible light beam forming the visible slit image.
Claim 8
Dependent Claim
22 words
Eye surgery apparatus according to claim 6, wherein the control slit has a fixed angular alignment and an adjustable length and width.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |