DE19530476A1 - Device for shaping the cornea - Google Patents

Device for shaping the cornea

Info

Publication number
DE19530476A1
DE19530476A1 DE19530476A DE19530476A DE19530476A1 DE 19530476 A1 DE19530476 A1 DE 19530476A1 DE 19530476 A DE19530476 A DE 19530476A DE 19530476 A DE19530476 A DE 19530476A DE 19530476 A1 DE19530476 A1 DE 19530476A1
Authority
DE
Germany
Prior art keywords
scattering particles
scattering
cornea
shaping
radial
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
DE19530476A
Other languages
German (de)
Inventor
Rudolf Prof Dr Steiner
Richard Dipl Ing Leiacker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
G Rodenstock Instrumente GmbH
Original Assignee
G Rodenstock Instrumente GmbH
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 G Rodenstock Instrumente GmbH filed Critical G Rodenstock Instrumente GmbH
Priority to JP8516449A priority Critical patent/JPH09508306A/en
Priority to US08/676,340 priority patent/US5895384A/en
Priority to EP95936949A priority patent/EP0782420A1/en
Priority to PCT/DE1995/001629 priority patent/WO1996015742A1/en
Publication of DE19530476A1 publication Critical patent/DE19530476A1/en
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F9/00—Methods 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
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/013—Instruments for compensation of ocular refraction ; Instruments for use in cornea removal, for reshaping or performing incisions in the cornea
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F9/00—Methods 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
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/008—Methods or devices for eye surgery using laser
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F9/00—Methods 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
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/008—Methods or devices for eye surgery using laser
    • A61F9/00825—Methods or devices for eye surgery using laser for photodisruption
    • A61F9/00827—Refractive correction, e.g. lenticle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/066—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F9/00—Methods 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
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/008—Methods or devices for eye surgery using laser
    • A61F2009/00861—Methods or devices for eye surgery using laser adapted for treatment at a particular location
    • A61F2009/00872—Cornea

Landscapes

  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Ophthalmology & Optometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgery (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Surgery Devices (AREA)
  • Prostheses (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Formung der Cornea und stellt eine Zusatzanmeldung zur deutschen Patentanmeldung P 44 41 579.6 dar.The invention relates to a device for Formation of the cornea and provides an additional application German patent application P 44 41 579.6.

Bei der aus der Hauptanmeldung bekannten Vorrichtung zur Formung der Cornea ist zur Einstellung einer ent­ sprechend dem gewünschten Abtrag eingestellten Radial­ verteilung der Energie des Laserstrahls ein Radial­ formungselement vorgesehen, das insbesondere aus einer plankonkaven und einer plankonvexen Linse bestehen kann, deren konkave und konvexe Flächen einander zuge­ kehrt sind.In the device known from the main application to shape the cornea is to adjust an ent according to the desired removal radial distribution of the energy of the laser beam a radial Forming element provided, in particular from a plano-concave and a plano-convex lens  can, the concave and convex surfaces facing each other are returning.

Im Rahmen der vorliegenden Zusatzanmeldung ist nun erkannt worden, daß es besonders vorteilhaft ist, wenn das Radialformungselement am Ort der Bildfeldblende angeordnet ist, da am Ort der Bildfeldblende die radiale Strahlenergie homogen und konstant ist.In the context of this additional application is now recognized that it is particularly advantageous if the radial shaping element at the location of the field diaphragm is arranged because at the location of the field diaphragm radial beam energy is homogeneous and constant.

Andererseits ist am Ort der Bildfeldblende der Strahl­ durchmesser - entsprechend dem Durchmesser des abzu­ tragenden Bereichs der Cornea - lediglich 5 bis 7 mm. Erfolgt die Radialformung ausschließlich durch Absorp­ tion, müssen Linsenelemente mit starker Krümmung ver­ wendet werden.On the other hand, the beam is at the location of the field diaphragm diameter - according to the diameter of the ab bearing area of the cornea - only 5 to 7 mm. The radial shaping takes place exclusively by absorption tion, lens elements with a strong curvature must be be applied.

Deshalb ist es besonders vorteilhaft, wenn die Strahlformung nicht nur durch die Absorption der Linsenelemente, sondern zusätzlich auch durch Streuung erfolgt. Durch streuende Partikel, wie beispielsweise Titanoxid kann über die Konzentration der Beimischung der radiale Energieabfall verstärkt werden, da ent­ sprechend den Streuereignissen pro Längeneinheit die Streuung mit der Tiefe exponentiell zunimmt. Darüber­ hinaus kann durch die Größe der Streupartikel die Streu­ charakteristik beeinflußt werden, wobei sich die Streu­ charakteristik von starker Vorwärtsstreuung bis zu isotroper Streuung ändern kann.It is therefore particularly advantageous if the Beam shaping not only through the absorption of the Lens elements, but also by scattering he follows. By scattering particles, such as Titanium oxide can over the concentration of the admixture the radial energy drop will be increased because ent speaking of the scattering events per unit length Scattering increases exponentially with depth. About it In addition, the size of the litter particles can cause litter characteristic can be influenced, the litter characteristics from strong forward scatter to isotropic scatter can change.

Die Streuung kann dabei dadurch erzeugt werden, daß ein Medium mit leichten Absorptionseigenschaften, dem die streuenden Partikel beigemischt werden, in einer Kammer eingeschlossen wird. Die Kammer kann beispielsweise aus einem Quarzmaterial bestehen. Als Medium mit leichten Absorptionseigenschaften kann z. B. flüssiges Silicon benützt werden, dem die streuenden Partikel beigemischt werden. Anschließend wird das Medium polimerisiert. Selbstverständlich können anstelle von Silicon auch andere Polymere, die durch die Laserwellenlänge noch nicht ablatiert werden, verwendet werden. Die Ver­ wendung von Silicon ist jedoch bevorzugt, da Silicon einen Brechungsindex vergleichbar mit Quarz hat.The scatter can be generated in that a Medium with light absorption properties, which the scattering particles are mixed in a chamber is included. The chamber can, for example consist of a quartz material. As a medium with light  Absorption properties can e.g. B. liquid silicone be used, to which the scattering particles are admixed will. The medium is then polymerized. Of course, instead of silicone, too other polymers by the laser wavelength yet not be ablated. The Ver Use of silicone is preferred, however, because silicone has a refractive index comparable to quartz.

Die Verwendung von streuenden Partikeln hat den zusätzlichen Vorteil, daß Unregelmäßigkeiten in der Energieverteilung, die durch die Modenstruktur hervorgerufen werden, zusätzlich durch die Streuprozesse homogenisiert werden (Milchglaseffekt).The use of scattering particles has the additional advantage that irregularities in the Energy distribution through the fashion structure are also caused by the Scattering processes are homogenized (milk glass effect).

Auch die streuende Kammer sollte möglichst nahe am Ort der Bildfeldblende angeordnet werden. Dabei kann durch die Wahl der Apertur der Abbildungsoptik und der Streu­ geometrie der Partikel sowie deren Konzentration die gewünschte Laserenergie zur Ablation am Auge eingestellt werden.The scattering chamber should also be as close as possible to the location the field diaphragm. It can by the choice of the aperture of the imaging optics and the scatter geometry of the particles and their concentration Desired laser energy for ablation on the eye can be set.

Claims (8)

1. Vorrichtung zur Formung der Cornea gemäß der deutschen Patentanmeldung P 44 41 579.6, dadurch gekennzeichnet, daß das Radialformungselement am Ort der Bildfeldblende angeordnet ist.1. Device for shaping the cornea according to German patent application P 44 41 579.6, characterized in that the radial shaping element is arranged at the location of the field diaphragm. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Radialformungselement streuende Partikel aufweist.2. Device according to claim 1, characterized in that the radial shaping element has scattering particles. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die streuenden Partikel in einem Polimer eingeschlossen sind.3. Device according to claim 2, characterized in that the scattering particles in are enclosed in a polymer. 4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Polymer in einer Quarz­ kammer eingeschlossen ist.4. The device according to claim 3, characterized in that the polymer in a quartz chamber is included. 5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Polymer Silicon ist.5. The device according to claim 3 or 4, characterized in that the polymer is silicone. 6. Vorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die streuenden Partikel aus Titanoxid (TiO₂) bestehen.6. Device according to one of claims 2 to 5, characterized in that the scattering particles Titanium oxide (TiO₂) exist. 7. Vorrichtung nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß die Größe der streuenden Partikel entsprechend der gewünschten Streucharakte­ ristik gewählt ist. 7. Device according to one of claims 2 to 6, characterized in that the size of the scattering Particles corresponding to the desired scattering file is selected.   8. Vorrichtung nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß die streuenden Partikel im Bereich der Bildfeldblende angeordnet sind.8. Device according to one of claims 2 to 7, characterized in that the scattering particles in Area of the field diaphragm are arranged.
DE19530476A 1994-11-22 1995-08-18 Device for shaping the cornea Ceased DE19530476A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP8516449A JPH09508306A (en) 1994-11-22 1995-11-22 Corneal shaping equipment
US08/676,340 US5895384A (en) 1994-11-22 1995-11-22 Device for shaping the cornea
EP95936949A EP0782420A1 (en) 1994-11-22 1995-11-22 Device for shaping the cornea
PCT/DE1995/001629 WO1996015742A1 (en) 1994-11-22 1995-11-22 Device for shaping the cornea

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4441579A DE4441579C1 (en) 1994-11-22 1994-11-22 Laser system for use in cornea forming

Publications (1)

Publication Number Publication Date
DE19530476A1 true DE19530476A1 (en) 1997-02-20

Family

ID=6533880

Family Applications (2)

Application Number Title Priority Date Filing Date
DE4441579A Expired - Fee Related DE4441579C1 (en) 1994-11-22 1994-11-22 Laser system for use in cornea forming
DE19530476A Ceased DE19530476A1 (en) 1994-11-22 1995-08-18 Device for shaping the cornea

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE4441579A Expired - Fee Related DE4441579C1 (en) 1994-11-22 1994-11-22 Laser system for use in cornea forming

Country Status (1)

Country Link
DE (2) DE4441579C1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753344A1 (en) * 1997-12-02 1999-06-10 Rodenstock Instr Device for homogenizing a light or laser beam
CA2319122C (en) * 1998-01-29 2004-06-01 Visx, Incorporated Laser delivery system and method with diffractive optic beam integration

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4004423C2 (en) * 1989-02-17 1998-05-14 Mezotraslevoj Nt Kompleks Mikr Device for the surgical treatment of ametropia

Also Published As

Publication number Publication date
DE4441579C1 (en) 1996-05-15

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