DE3535073A1 - Photoablation diaphragm - Google Patents

Photoablation diaphragm

Info

Publication number
DE3535073A1
DE3535073A1 DE19853535073 DE3535073A DE3535073A1 DE 3535073 A1 DE3535073 A1 DE 3535073A1 DE 19853535073 DE19853535073 DE 19853535073 DE 3535073 A DE3535073 A DE 3535073A DE 3535073 A1 DE3535073 A1 DE 3535073A1
Authority
DE
Germany
Prior art keywords
aperture
beam path
laser light
cornea
spokes
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.)
Withdrawn
Application number
DE19853535073
Other languages
German (de)
Inventor
Theo Dr Dr Seiler
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.)
SEILER GERAETEBAU
Original Assignee
SEILER GERAETEBAU
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 SEILER GERAETEBAU filed Critical SEILER GERAETEBAU
Priority to DE19853535073 priority Critical patent/DE3535073A1/en
Publication of DE3535073A1 publication Critical patent/DE3535073A1/en
Withdrawn legal-status Critical Current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
    • A61F9/008—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
    • A61F9/00802—Methods or devices for eye surgery using laser for photoablation
    • A61F9/00804—Refractive treatments
    • 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
    • A61F9/00802—Methods or devices for eye surgery using laser for photoablation
    • A61F9/00817—Beam shaping with 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

Abstract

Published without abstract.

Description

Die Erfindung betrifft eine Einrichtung zur Beeinflussung der Eindringtiefe des Laserlichtes bei der Photoablation der Hornhaut.The invention relates to a device for Influencing the penetration depth of the laser light the photoablation of the cornea.

Es ist bereits vorgeschlagen worden, bei bestimmten Augenerkrankungen mittels eines Laserlichtes Schnitte in die Hornhaut des Auges einzubringen, um auf diese Weise die Brechung der Hornhaut zu verändern.It has already been suggested for certain Eye diseases using a laser light cuts into the cornea of the eye to get on it Way to change the refraction of the cornea.

Der Erfindung liegt die Aufgabe zugrunde, die Eindringtiefe des Laserlichtes bei dieser Photoablation der Hornhaut zu beeinflussen.The invention has for its object the depth of penetration of the laser light in this photoablation of the Affecting cornea.

Gelöst wird diese Aufgabe erfindungsgemäß mit den Merkmalen im Kennzeichen des Anspruchs 1.This object is achieved according to the invention with the features in the characterizing part of claim 1.

Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen.Further refinements result from the subclaims.

Erfindungsgemäß wird zur Beeinflussung der Eindringtiefe des Laserlichtes eine Blende verwendet, die drehbar im Strahlengang angeordnet ist. Durch entsprechende Ausbildung der Blende, wie sie beispielsweise im Anspruch 2 angegeben ist, wird erreicht, daß die Einschnittiefe über die gesamte Hornhaut prozentual ausgeglichen ist.According to the invention to influence the depth of penetration the laser light uses an aperture that is rotatable is arranged in the beam path. By appropriate Training the aperture, such as in Claim 2 is specified, it is achieved that the Percentage of incision across the entire cornea is balanced.

Die Erfindung soll nachfolgend anhand einer Figur erläutert werden, wobei diese schematisch eine Aufsicht auf eine Ausführung der Blende zeigt.The invention is explained below with reference to a figure be, this schematically a supervision points to a version of the aperture.

Im dargestellten Beispiel besteht die Blende 1 aus einem äußeren Kreisring 2 und einem inneren zentralen kreisförmigen Abschnitt 3. Dieser zentrale Bereich 3 soll den zentralen optischen Bereich der Hornhaut schützen und kann im übrigen zur Anbringung eines Fixationszieles (Fixationslücke) benutzt werden, bspw. aktiv leuchtend, fluoriszierend oder reflektierend. Im dargestellten Beispiel weist die Blende vier Speichen 4 bestimmter Ausbildung auf. Selbstverständlich können auch weniger oder mehr Speichen gewählt werden, woei die Form und die Anzahl davon abhängt, wie der prozentuale Ausgleich für das Eindringen des Laserlichtes am besten gewährleistet ist.In the example shown, the diaphragm 1 consists of an outer circular ring 2 and an inner central circular section 3 . This central area 3 is intended to protect the central optical area of the cornea and can also be used to attach a fixation target (fixation gap), for example, actively illuminating, fluorescent or reflective. In the example shown, the screen has four spokes 4 of specific design. Of course, fewer or more spokes can also be selected, depending on the shape and the number, how the percentage compensation for the penetration of the laser light is best guaranteed.

Für die Blendenform sind zwei Faktoren wichtig. Es ist bekannt, daß die Hornhautdicke zur Peripherie hin zunimmt. Darüber hinaus ist die Hornhaut gekrümmt und damit trifft das Laserlicht auf die Hornhaut unter verschiedenen Winkeln auf. Rechnerisch läßt sich die reale Eindringtiefe mit der Absorptionstiefe (parallel zum Laserlicht) über einen Cosinuswinkel bestimmen. Hierfür gilt:Two factors are important for the aperture shape. It is known that the corneal thickness towards the periphery increases. In addition, the cornea is curved and the laser light hits the cornea different angles. This can be calculated real penetration depth with the absorption depth (parallel to the laser light) via a cosine angle. The following applies:

Δ (α) = Δ o (2 - cosα) und
Tr = T n · cos α Δ ( α ) = Δ o (2 - cos α ) and
Tr = T n · cos α

Δ = Hornhautdicke
Tr = reale Eindringtiefe
T n = Absorptionstiefe (parallel zum Laserlicht) Δ = corneal thickness
Tr = real depth of penetration
T n = absorption depth (parallel to the laser light)

Wenn die Blende, wie im Anspruch 7 angegeben, asymmetrisch zum Strahlengang angeordnet ist, so ergibt sich die Möglichkeit durch das Eindrehen der Blende in den Strahlengang des Laserlichtes, diesen zunehmend zu verdecken bzw. freizugeben, und auf diese Weise kann ebenfalls die Eindringtiefe des Laserlichtes bei der Photoablation der Hornhaut beeinflußt werden. Zweckmäßig ist es, daß bei dieser Ausgestaltung der Erfindung der Strahlengang einen rechteckigen Querschnitt aufweist. Selbstverständlich ist aber auch eine andere Form des Querschnittes des Strahlenganges möglich, wenn die Blende entsprechend angepaßt ist und damit in den Strahlengang eindrehbar ist.If the aperture, as specified in claim 7, asymmetrical is arranged to the beam path, it follows the possibility by screwing the cover into the Beam path of the laser light to cover it increasingly or release, and in this way also the penetration depth of the laser light at  Photoablation of the cornea can be affected. Appropriately it is that with this configuration the Invention of the beam path a rectangular Has cross-section. Of course it is also another form of cross-section of the beam path possible if the aperture is adjusted accordingly and so that it can be screwed into the beam path.

Claims (8)

1. Einrichtung zur Beeinflussung der Eindringtiefe des Laserlichtes bei der Photoablation der Hornhaut, gekennzeichnet durch eine sektorartig ausgebildete, in den Strahlengang zwischen Laserlichtquelle und zu behandelnder Hornhaut einschieb- bzw. fixierbare, um eine in Richtung des Strahlenganges angeordnete Achse drehbare Blende (1).1. Device for influencing the penetration depth of the laser light during photoablation of the cornea, characterized by a sector-like aperture ( 1 ) which can be inserted or fixed into the beam path between the laser light source and the cornea to be treated and rotatable about an axis arranged in the direction of the beam path. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Blende (1) einen äußeren Kreisring (2) und einen zentralen, kreisförmigen Abschnitt (3) aufweist und daß zwischen dem Kreisring und dem kreisförmigen Abschnitt Speichen (4) vorgesehen sind.2. Device according to claim 1, characterized in that the diaphragm ( 1 ) has an outer circular ring ( 2 ) and a central circular section ( 3 ) and that spokes ( 4 ) are provided between the circular ring and the circular section. 3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Form der Speichen durch eine hintere radial verlaufende Kante und eine vordere bogenförmig verlaufende Kante definiert ist. 3. Device according to claim 2, characterized, that the shape of the spokes is radial through a rear trending edge and a front arcuate Edge is defined.   4. Einrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die vorderen und hinteren Kanten der Speichen parallel bzw. annähernd parallel verlaufen.4. Device according to one of claims 1 or 2, characterized, that the front and rear edges of the spokes run parallel or approximately parallel. 5. Einrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß die Drehgeschwindigkeit der Blende regelbar ist.5. Device according to claims 1 to 4, characterized, that the speed of rotation of the aperture is adjustable. 6. Einrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Blende eine zentrale Fixationslücke aufweist.6. Device according to one of claims 1 to 5, characterized, that the aperture has a central fixation gap. 7. Einrichtung nach einem der vorstehenden Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Achse der Blende außerhalb des Strahlenganges des Laserlichtes angeordnet ist und daß die Blende in den Strahlengang, diesen zunehmend verdeckend bzw. freigebend, eindrehbar ist.7. Device according to one of the preceding claims 1 until 6, characterized, that the axis of the aperture outside the beam path the laser light is arranged and that the aperture in the beam path, increasingly obscuring it or releasing, rotatable. 8. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß der Strahlengang einen rechteckigen Querschnitt aufweist.8. Device according to claim 7, characterized, that the beam path has a rectangular cross section having.
DE19853535073 1985-09-27 1985-09-27 Photoablation diaphragm Withdrawn DE3535073A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19853535073 DE3535073A1 (en) 1985-09-27 1985-09-27 Photoablation diaphragm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853535073 DE3535073A1 (en) 1985-09-27 1985-09-27 Photoablation diaphragm

Publications (1)

Publication Number Publication Date
DE3535073A1 true DE3535073A1 (en) 1987-04-09

Family

ID=6282502

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853535073 Withdrawn DE3535073A1 (en) 1985-09-27 1985-09-27 Photoablation diaphragm

Country Status (1)

Country Link
DE (1) DE3535073A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296982A1 (en) * 1987-06-25 1988-12-28 Hanna Khalil Device for correcting the shape of an object by laser treatment
US4856513A (en) * 1987-03-09 1989-08-15 Summit Technology, Inc. Laser reprofiling systems and methods
US4994058A (en) * 1986-03-19 1991-02-19 Summit Technology, Inc. Surface shaping using lasers
US5019074A (en) * 1987-03-09 1991-05-28 Summit Technology, Inc. Laser reprofiling system employing an erodable mask
WO1992000711A1 (en) * 1990-07-07 1992-01-23 Aesculap Ag Process and device for modelling or correcting optical lenses, especially the cornea of the eye
DE4143066A1 (en) * 1991-12-27 1993-07-01 Jenoptik Jena Gmbh Marking large area surfaces with laser beam - divided into several smaller beams which are focussed at the surface to be marked
US5281211A (en) * 1989-06-07 1994-01-25 University Of Miami, School Of Medicine, Dept. Of Ophthalmology Noncontact laser microsurgical apparatus
US5284477A (en) * 1987-06-25 1994-02-08 International Business Machines Corporation Device for correcting the shape of an object by laser treatment
EP0590772A1 (en) * 1992-09-29 1994-04-06 Mukai, Katsuhiko Corneal sponge and method of use
US5324281A (en) * 1987-03-09 1994-06-28 Summit Technology, Inc. Laser reprofiling system employing a photodecomposable mask
US5423801A (en) * 1986-03-19 1995-06-13 Summit Technology, Inc. Laser corneal surgery
US5651784A (en) * 1993-06-04 1997-07-29 Summit Technology, Inc. Rotatable aperture apparatus and methods for selective photoablation of surfaces
EP1591088A1 (en) * 2004-04-27 2005-11-02 Ligi Tecnologie Medicali S.p.A. Refractive cornea ablation apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4994058A (en) * 1986-03-19 1991-02-19 Summit Technology, Inc. Surface shaping using lasers
US5423801A (en) * 1986-03-19 1995-06-13 Summit Technology, Inc. Laser corneal surgery
US5019074A (en) * 1987-03-09 1991-05-28 Summit Technology, Inc. Laser reprofiling system employing an erodable mask
US4856513A (en) * 1987-03-09 1989-08-15 Summit Technology, Inc. Laser reprofiling systems and methods
US5324281A (en) * 1987-03-09 1994-06-28 Summit Technology, Inc. Laser reprofiling system employing a photodecomposable mask
FR2617042A1 (en) * 1987-06-25 1988-12-30 Khalil Hanna HORN SURGERY DEVICE
EP0296982A1 (en) * 1987-06-25 1988-12-28 Hanna Khalil Device for correcting the shape of an object by laser treatment
US5284477A (en) * 1987-06-25 1994-02-08 International Business Machines Corporation Device for correcting the shape of an object by laser treatment
US5281211A (en) * 1989-06-07 1994-01-25 University Of Miami, School Of Medicine, Dept. Of Ophthalmology Noncontact laser microsurgical apparatus
US5865830A (en) * 1989-06-07 1999-02-02 Parel; Jean-Marie Noncontact laser microsurgical apparatus
WO1992000711A1 (en) * 1990-07-07 1992-01-23 Aesculap Ag Process and device for modelling or correcting optical lenses, especially the cornea of the eye
DE4143066A1 (en) * 1991-12-27 1993-07-01 Jenoptik Jena Gmbh Marking large area surfaces with laser beam - divided into several smaller beams which are focussed at the surface to be marked
AU659012B2 (en) * 1992-09-29 1995-05-04 Mukai, Katsuhiko Corneal sponge and method of use
EP0590772A1 (en) * 1992-09-29 1994-04-06 Mukai, Katsuhiko Corneal sponge and method of use
US5651784A (en) * 1993-06-04 1997-07-29 Summit Technology, Inc. Rotatable aperture apparatus and methods for selective photoablation of surfaces
EP1591088A1 (en) * 2004-04-27 2005-11-02 Ligi Tecnologie Medicali S.p.A. Refractive cornea ablation apparatus

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Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee