DD263447A1 - Arrangement for the operational treatment of the eyeberry skin - Google Patents

Arrangement for the operational treatment of the eyeberry skin Download PDF

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Publication number
DD263447A1
DD263447A1 DD87306573A DD30657387A DD263447A1 DD 263447 A1 DD263447 A1 DD 263447A1 DD 87306573 A DD87306573 A DD 87306573A DD 30657387 A DD30657387 A DD 30657387A DD 263447 A1 DD263447 A1 DD 263447A1
Authority
DD
German Democratic Republic
Prior art keywords
provided
characterized
arrangement
optical component
optical fiber
Prior art date
Application number
DD87306573A
Other languages
German (de)
Inventor
Manfred Rothhard
Ulf Krause
Original Assignee
Zeiss Jena Veb Carl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zeiss Jena Veb Carl filed Critical Zeiss Jena Veb Carl
Priority to DD87306573A priority Critical patent/DD263447A1/en
Publication of DD263447A1 publication Critical patent/DD263447A1/en
Priority to DE4219809A priority patent/DE4219809A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/073Shaping the laser spot
    • B23K26/0734Shaping the laser spot into an annular shape
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007Methods or devices for eye surgery
    • A61F9/008Methods or devices for eye surgery using laser
    • A61F9/00802Methods or devices for eye surgery using laser for photoablation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06Shaping the laser beam, e.g. by masks or multi-focusing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007Methods or devices for eye surgery
    • A61F9/008Methods or devices for eye surgery using laser
    • A61F2009/00861Methods or devices for eye surgery using laser adapted for treatment at a particular location
    • A61F2009/00872Cornea

Abstract

Arrangement for the operative treatment of the cornea of the eye using a laser light source and the light beam conducting optical components, wherein at least one of the cross section of the Lichtbuendels forming and the, the Corneawoelbung annaehernd corresponding image surface of the dissipative system generating optical component is provided. Advantageously, either a cylindrical lens array, specially designed Lichtleitfaserbuendel or layer waveguide defined in conjunction with at least one spherical lens. Fig. 1

Description

For this 1 page drawings

Field of application of the invention

The invention finds application in the generation of linear structures by means of powerful laser light sources, ζ. As excimer laser, for use in microsurgery especially in ophthalmology for rofraktiv Keratotomie (correction of refractive error of the eye by means of cuts in the cornea). Use in photolithography is also possible.

Characteristic of the known state of the art

Since the beginning of the 1980s, powerful pulsed light sources have been available in the UV with the excimer lasers. Meanwhile, there are commercial devices for correcting vision defects using radial keratotomy in which excimer lasers are used.

In this method, the cornea is scratched by the laser light in certain places up to 80% of its thickness, (Trokol MD, Amer Joum of ophthalm., 96 [1983] 710-715). The location of these cuts depends on the type of visual defect. One uses about 10 to 20 different patterns, which are also varied in their depth of cut and number. The cuts are principally outside the range of vision (iris). The cutting length is a few millimeters, their width a few tenths of a millimeter.

In a known solution (EP 0151869), the use of a free ansteuei Baren laser scanner is proposed. The laser beam is focused on the cornea and this focus is guided over the cornea with the aid of the laser scanner in a predetermined pattern. The laser focus is moved accordingly to the corneal curvature. Disadvantage of this solution is that the beam tracking is very expensive. The usable spot size of the laser beam on the cornea can not exceed the desired cutting width. In order to avoid destruction of the cornea, the energy density on the cornea must not exceed about 5 J / cm 2 , ie, the maximum usable energy per impulse provides about 10mJ. However, commercial excimer lasers have pulse energies of at least 10 ohms. This leaves 90% of the energy of the laser unused. Due to this limitation, the provision of the cuts is very time consuming and the patient's eye must be very precisely fixed practice r long time.

In another known solution (EP 0111060), a mask with the appropriate sectional shape is placed on the cornea and then illuminated with the laser beam focusing only weakly. The fixation of the eye takes place through the mask. The interface occupies only about 20% of the total corneal surface, so that about 80% of the laser energy is reflected off the mask and lost. Scanning the sections with a laser scanner while using a mask increases the effort considerably and has similar disadvantages as the former solution. Above all, there is the disadvantage that due to the avoidance of damage to the eye, the pointwise present high energy can not be fully utilized (energy losses).

Object of the invention

The aim of the invention is the reduction of energy consumption and the technical equipment effort and an improvement of the working conditions of doctor and patient during the operation.

Explanation of the essence of the invention;

The invention has for its object to provide an arrangement for the surgical treatment of the cornea, using a Laserlichquelle, in which almost all the energy generated by the laser is used for cutting and the treatment time, the duration of surgery on the eye and thus the eye strain is lowered.

The object is achieved by an arrangement for the operative treatment of the cornea, comprising a laser, the laser light-conducting optical components such as lenses or prisms, an optical fiber and / or a Lichtleitfaserbündel, according to the invention solved in that at least one of the cross section of the light beam forming and the Cornea curvature is provided approximately exactly corresponding image surface of the imaging system generating optical component.

According to the invention, it is advantageous to provide a cylindrical lens array following an axicon pair as an optical element or a light guide fiber bundle provided with a specific output cross section and a concavely curved exit surface and a spherical one. Use astigmatism-containing lens.

Further is. It is advantageous that a layer waveguide provided with a specific output cross-section and a concavely curved exit surface and a spherical astigmatism-containing lens provided as the optical component according to the invention or a Lichtleitfasarbündel in which the end piece of each optical fiber is defined shaped and taped and a lens are arranged.

By means of the arrangement according to the invention, it is possible to carry out all cuts to be made in the cornead of an eye at the same time, ie : almost complete utilization of the radiation energy of the laser. This reduces the necessary energy expenditure and improves the working conditions of the physician and minimizes the burden on the patient during the operation.

embodiment

The invention will be explained in more detail below with reference to embodiments. In the drawing show in a schematic representation

1 and 1a show an arrangement using a cylindrical lens array, Figs. 2 to 2 b show an arrangement using a defined shaped optical fiber bundle, and Figs. 3 to 3d show an arrangement using a defined shaped film waveguide.

In Fig. 1, an inventive arrangement for the surgical treatment of the eye is shown. Successively, a laser 1, a lens 2, an input taper 3, an optical fiber 4, an axicon pair 5, a cylindrical lens array 6 and a mask 16 are arranged along an optical axis.

The emitted light from the laser 1 is focused with a lens 2 and coupled by means of an input taper 3 in the optical fiber 4. The fiber cone is needed to reduce the energy load on the coupling surface, since with the usual fiber core diameters (200pm ... 600pm) the pulse energy of the excimer laser can already lead to the destruction of the fiber end face. The transmission of the light over a single optical fiber allows maximum flexibility and complete mixing and honing of the laser light. This is a significant advantage over arrangements with multiple transmission fibers.

With the help of the axicon pair, a parallel light bundle with an annular cross-section is generated from the circular divergent light bundle. Thus, the total light energy is concentrated in the area between the radii r, and r 2 , in which the cuts are introduced into the cornea. The inner limit is determined by the radius of the eye pupil, the outer limit by the eye diameter (r 2 5 ... 6mm). Each individual cylindrical lens of the Zylinderlinsenan ays 6 generated from a certain sector of the Lichtbünde's a radial line in the image area. The individual cylindrical lenses are according to the invention inclined so that the image plane in the region of the respective section line approximately coincides with the Obb. Area of the cornea to achieve the most uniform width of the cuts over the entire length of cut. In addition, to protect all areas of the cornea that are not to be irradiated, a mask 16 can be fixed in front of the eye.

1 a shows the construction of the cylindrical lens array 6.

In Fig. 2 to 2 b, another possible embodiment is shown, in which the cross-sectional shaping by means of an optical fiber bundle 8 consisting of several hundred optical fibers, is performed. In this case, from the rectangular input cross section, Fig. 2 ö, which corresponds to the shape of the laser beam, a cross section is generated which corresponds to the desired cutting pattern of the corneal sections, Fig. 2 b. For coupling the laser light is focused with a lens 2 on the end face of the optical fiber bundle 8, wherein the spot diameter and the numerical aperture are adapted to the fibers.

The pattern of the starting cross-section, Fig. 2 b, consists of linear arrays of circular discs corresponding to the fiber core diameter. These patterns are imaged with the lens 12 so that the desired cutting lines on the cornea T of the eye 7 arise. In this case, the astigmatism of the lens is exploited and the fact that jass in imaging only offaxial pixels occur. Thus, in the sagittal image shell, a radially elongated spot is produced from each circular disk of the fiber bundle exit surface, so that in the image surface (surface of the cornea) the individual elongated spots overlap to lines with a certain width.

The exit surface 11 of the optical fiber bundle 8 has a concave curvature, so that the image surface coincides with the imaging of the lens 12 with the curved surface of the cornea. This concave curvature can be generated by appropriate arrangement of the individual fibers or possibly by grinding and polishing.

A further advantageous embodiment is shown in Figure 3 to 3d. It is shown an arrangement in which an optical fiber bundle 13 made of a small number of optical fibers is cross-sectioned.

The layer waveguides 14, which correspond to the number of required corneal sections, act as astigmatic elements. m

The layer waveguide 14 acts as a light mixer at the same time, if at its input side S irnfläche with several

is irradiated with different intensity transmitting optical fibers. This allows an equal intensity for all cuts :

be ensured.

The emitted light beam from the laser 1 is with the lens 2 on the front end face of the optical fiber bundle 13 with the

Cross section CC, Fig.3a, shown. On the output side, the optical fiber bundle 13 has the cross section DD, Fig.3b. Each group of optical fibers of the output cross-section of the optical fiber bundle 13 is attached to the input-side end face of the corresponding layer waveguide 14 blunt. The output-side end face 17 of the layer waveguide 14 is concavely curved, so that it is imaged with the lens 12 on the cornea T. In the image, the astigmatism of the lens 12 can additionally be utilized if the cornea T is brought into the sagittate image shell, analogously to the embodiment according to FIG. If necessary, the layered waveguide 14 could also be replaced by an optical fiber bundle, in which the tail of each individual optical fiber is shaped and tinted in a defined manner. The advantage over the embodiment according to FIG. 2 is the small number of optical fibers in the optical fiber bundle. This is important for two reasons. On the one hand, the fibers must be arranged in the bundle to ensure equal intensities in each area of each corneal section, on the other hand relatively expensive fibers with high transmission in the UV range are saved.

Claims (5)

1. An arrangement for the operative treatment of the cornea, comprising a laser, the laser light-conducting optical components such as lenses or prisms, an optical fiber and / or a Lichtleitfaserbündel, characterized in that at least one of the cross-section of the light beam forming and, approximately corresponding to the Corneawölbung Image surface of the imaging system generating optical component (6,11,12,15,17) is provided.
2. Arrangement according to claim 1, characterized in that as an optical component - a cylindrical lens array (6) an axicon pair (5) is arranged following.
3. Arrangement according to claim 1, characterized in that there is provided as an optical component with an output cross-section (10) and a concave open Ajstrittsfläche (11) provided Lichtleitfaserbündel (8) and a spherical lens having astigmatism (12).
4. Arrangement according to claim 1, characterized in that as an optical component provided with an output cross-section (18) and a concave outlet surface (17) provided layer waveguide (14) and a spherical lens (12) is provided.
5. Arrangement according to claim 1, characterized in that as the optical component, an optical fiber bundle in which the end piece (15) of each individual optical fiber is defined shaped and taped and a lens (12) is provided.
DD87306573A 1987-09-02 1987-09-02 Arrangement for the operational treatment of the eyeberry skin DD263447A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DD87306573A DD263447A1 (en) 1987-09-02 1987-09-02 Arrangement for the operational treatment of the eyeberry skin
DE4219809A DE4219809A1 (en) 1987-09-02 1992-06-17 Material surface layers removal for precision and less complicated system - by successive radiation of parts of surface with optical element system in electromagnetic beam path for constant area cross=section maintenance

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD87306573A DD263447A1 (en) 1987-09-02 1987-09-02 Arrangement for the operational treatment of the eyeberry skin
DE4219809A DE4219809A1 (en) 1987-09-02 1992-06-17 Material surface layers removal for precision and less complicated system - by successive radiation of parts of surface with optical element system in electromagnetic beam path for constant area cross=section maintenance

Publications (1)

Publication Number Publication Date
DD263447A1 true DD263447A1 (en) 1989-01-04

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ID=25748166

Family Applications (1)

Application Number Title Priority Date Filing Date
DD87306573A DD263447A1 (en) 1987-09-02 1987-09-02 Arrangement for the operational treatment of the eyeberry skin

Country Status (2)

Country Link
DD (1) DD263447A1 (en)
DE (1) DE4219809A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4001434A1 (en) * 1989-01-20 1990-08-02 Mezotraslevoj Nt Kompleks Mikr Device for surgical treatment of refractive error
WO1992001430A1 (en) * 1990-07-23 1992-02-06 Houston Advanced Research Center Improved method and apparatus for performing corneal reshaping to correct ocular refractive errors
EP0581339A2 (en) * 1989-06-30 1994-02-02 Laser Biotech, Inc. Collagen treatment apparatus and method
WO1994003134A1 (en) * 1992-08-03 1994-02-17 Sunrise Technologies, Inc. Method and apparatus for exposing a human eye to a controlled pattern of radiation spots

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687956B2 (en) 1994-06-17 2005-11-23 Carl Zeiss SMT AG Illumination device
US6063072A (en) * 1994-12-08 2000-05-16 Summit Technology, Inc. Methods and systems for correction of hyperopia and/or astigmatism using ablative radiation
US5613965A (en) * 1994-12-08 1997-03-25 Summit Technology Inc. Corneal reprofiling using an annular beam of ablative radiation
DE29505985U1 (en) * 1995-04-06 1995-07-20 Bestenlehrer Alexander Device for machining, in particular for polishing and structuring of any 3D shaped surfaces by means of a laser beam
US5639668A (en) * 1995-09-14 1997-06-17 Boehringer Mannheim Corporation Optical apparatus for performing an immunoassay

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4001434A1 (en) * 1989-01-20 1990-08-02 Mezotraslevoj Nt Kompleks Mikr Device for surgical treatment of refractive error
EP0581339A2 (en) * 1989-06-30 1994-02-02 Laser Biotech, Inc. Collagen treatment apparatus and method
EP0581339A3 (en) * 1989-06-30 1994-11-17 Laser Biotech Inc Collagen treatment apparatus and method.
WO1992001430A1 (en) * 1990-07-23 1992-02-06 Houston Advanced Research Center Improved method and apparatus for performing corneal reshaping to correct ocular refractive errors
WO1994003134A1 (en) * 1992-08-03 1994-02-17 Sunrise Technologies, Inc. Method and apparatus for exposing a human eye to a controlled pattern of radiation spots

Also Published As

Publication number Publication date
DE4219809A1 (en) 1993-12-23

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Legal Events

Date Code Title Description
RPI Change in the person, name or address of the patentee (searches according to art. 11 and 12 extension act)
ASS Change of applicant or owner

Owner name: CARL ZEISS JENA GMBH

Effective date: 19920918

IF04 In force in the year 2004

Expiry date: 20070903