EP0245392A1 - Dispositif pour la photochirurgie et notamment pour la keratotomie de la cornee - Google Patents

Dispositif pour la photochirurgie et notamment pour la keratotomie de la cornee

Info

Publication number
EP0245392A1
EP0245392A1 EP19860906772 EP86906772A EP0245392A1 EP 0245392 A1 EP0245392 A1 EP 0245392A1 EP 19860906772 EP19860906772 EP 19860906772 EP 86906772 A EP86906772 A EP 86906772A EP 0245392 A1 EP0245392 A1 EP 0245392A1
Authority
EP
European Patent Office
Prior art keywords
laser
light
raman cell
raman
cell
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Withdrawn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
EP19860906772
Other languages
German (de)
English (en)
Inventor
Hartmut Mennicke
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
Publication of EP0245392A1 publication Critical patent/EP0245392A1/fr
Withdrawn legal-status Critical Current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
    • A61F2009/00861—Methods or devices for eye surgery using laser adapted for treatment at a particular location
    • A61F2009/00872—Cornea

Definitions

  • the invention relates to a device for light surgery and in particular for keratotomy of the cornea according to the preamble of claim 1.
  • UV light has hitherto been used essentially in the light keratotomy of the human eye.
  • the known excimer lasers in particular have been used, the light of which is good for making cuts or for removing material layers on the Cornea is suitable.
  • the UV radiation of the known excimer lasers has the disadvantage that the risk of mutagenicity and carcinogenicity caused by UV light cannot be neglected.
  • the article mentioned deals in a very general way with questions of laser surgery, in particular human skin, and has no connection to the keratotomy of the eye.
  • HF hydrogen fluorine
  • the HF laser is very unwieldy because of its toxic gases and the total effort required.
  • the object is to provide a device Specification for light surgery and in particular for keratotomy of the eye, which emits light in the range of 2.7 and 3.2 microns in such a way that the light beam of the device is suitable for surgical purposes.
  • an operating light source which has a pulsed laser and a Raman cell filled with a suitable Raman medium, for example a gas or a liquid, in which radiation of the wavelength between approximately 2.7 ⁇ m and approximately 3, with the aid of the stimulated Raman effect, 2 ⁇ m is generated.
  • the pulsed laser serves as a pump light source for the Raman cell. Since the conversion rate for the stimulated Raman effect is generally very high, it is possible in this way to obtain radiation in the region around 3 ⁇ m, the power of which enables light surgery and the “beam quality” of which allows excellent focusing.
  • a laser with a high repetition rate and high pulse power for example in the megawatt range
  • Such a laser is - as claimed in claim 2 - for example an iodine laser with a wavelength of 1.315 ⁇ m or a neodymium-YAG laser with a wavelength of 1.06 ⁇ m.
  • both types of laser can be operated in q-switch or mode-lock mode.
  • the Raman cell can also be filled with HCL, CO, 0 2 or NO (claim 4).
  • Advantageous combinations of these lasers with Raman media are characterized in claims 5 to 7.
  • the structure of the Raman cells can be freely designed within wide limits. When using gases as Raman media, however, high-pressure cells are particularly advantageous (claim 8). When filling with hydrogen or CH. is usually operated at a pressure of about 5 bar, typically around 25 bar. It is particularly advantageous to use a Raman cell of the wave guide type (claim 9). Such a Raman cell has the advantage that it emits a light beam that can be bundled well.
  • Fig. 1 shows a cross section through an inventive
  • Fig. 2 shows the dependence of the Stokes energy on the
  • FIG. 1 schematically shows a cross section through a device according to the invention, in which an NdYAG laser 1 is used as the pump laser, the light of which focuses a lens 2 into a high-pressure Raman cell 3.
  • the light which arises in the Raman cell in the Stokes orders is coupled in by a lens 4 into an operating beam path (not shown in more detail) as parallel light.
  • an NdYAG laser which operates in multimode mode and which delivers an energy of up to 1.5 joules per pulse at a pulse repetition rate of at most 10 Hz and a pulse duration of 15 ns.
  • Raman cell 3 has an inner diameter of approx. 10 mm and a length of approx. Im and is closed off by flat windows 3 'or 3 ".
  • the gas pressure in the Raman cell can be up to 35 bar.
  • the Raman cell is CH. filled.
  • the pressure was varied between about 1 bar and about 35 bar.
  • lenses 2 of different focal lengths have been used to focus the light of the NdYAG laser 1 into the Raman cell.
  • the focal lengths of the lens * 2 are 500 mm, 750 mm and 1000 mm.
  • the best results are obtained when the gas pressure is approximately 27.5 bar and the focal length of the focusing lens 2 is 1000 mm, i.e. roughly equal to the length of the Raman cell.
  • the reason for this is likely to be gas breakthroughs at smaller focal lengths, which lead to a breakdown of the Raman conversion into the 2nd order of stokes and, moreover, to considerable impurities in the Raman cell (splitting into carbon and hydrogen).
  • FIG. 3 shows the dependence of the Stoke energy on the energy of the pump laser radiation with optimal focusing and optimal pressure.
  • pump energies of approximately 500 mJ give energy per shot of approximately 10 mJ, which are sufficient, for example, for radial keratotomy.
  • the invention has been described above on the basis of an exemplary embodiment without restricting the general inventive concept - to use an operating light source which has a Raman cell pumped with a pulsed laser to generate light in the wavelength range between 2.7 ⁇ m and 3.3 ⁇ m .
  • the arrangement proposed according to the invention has the advantage that, with comparatively little effort, a light source can be obtained which emits light of good beam quality in the wave range from 2.7 ⁇ m to 3.2 ⁇ m, which according to the invention is particularly suitable for the keratotomy of the eye and the extensive ablation of layers of the cornea has been appropriately recognized.
  • the device for light surgery can have a known structure;
  • a laser device with slit lamp known per se can be used, in which the laser beam covers the area in which an incision is made. should be brought, scanned or this area illuminated.

Landscapes

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

Abstract

Dispositif pour la photochirurgie et en particulier pour la kératotomie de l'oeil, comportant une source lumineuse operatoire, dont la lumière est applicable sur la région du tissu à opérer. Le dispositif ci-décrit est caractérisé en ce qu'il fait appel pour la production de lumière dans une plage de longueur d'ondes comprise entre 2,7 mum et 3,3 mum à une source lumineuse opératoire comportant une cellule Raman à pompage par laser pulsé. Il est ainsi possible d'obtenir un rayonnement dans la plage avoisinant 3 mum, dont la puissance autorise la pratique de la photochirurgie et dont la "qualité de rayons" permet une focalisation remarquable.
EP19860906772 1985-11-16 1986-11-17 Dispositif pour la photochirurgie et notamment pour la keratotomie de la cornee Withdrawn EP0245392A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853540763 DE3540763A1 (de) 1985-11-16 1985-11-16 Vorrichtung zur lichtchirurgie und insbesondere zur keratotomie der cornea
DE3540763 1985-11-16

Publications (1)

Publication Number Publication Date
EP0245392A1 true EP0245392A1 (fr) 1987-11-19

Family

ID=6286214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860906772 Withdrawn EP0245392A1 (fr) 1985-11-16 1986-11-17 Dispositif pour la photochirurgie et notamment pour la keratotomie de la cornee

Country Status (4)

Country Link
EP (1) EP0245392A1 (fr)
JP (1) JPS63501844A (fr)
DE (1) DE3540763A1 (fr)
WO (1) WO1987002884A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4791927A (en) * 1985-12-26 1988-12-20 Allied Corporation Dual-wavelength laser scalpel background of the invention
US5364390A (en) * 1988-05-19 1994-11-15 Refractive Laser Research And Development, Inc. Handpiece and related apparatus for laser surgery and dentistry
WO1989011261A1 (fr) * 1988-05-23 1989-11-30 Schneider, Richard, T. Dispositif medical a laser et procede
US5074861A (en) * 1988-05-23 1991-12-24 Schneider Richard T Medical laser device and method
US5152759A (en) * 1989-06-07 1992-10-06 University Of Miami, School Of Medicine, Dept. Of Ophthalmology Noncontact laser microsurgical apparatus
EP0515539B2 (fr) * 1990-02-16 1997-08-27 AMIEL, Jean Sonde multicanalaire
US5782822A (en) * 1995-10-27 1998-07-21 Ir Vision, Inc. Method and apparatus for removing corneal tissue with infrared laser radiation
US5846080A (en) * 1995-12-20 1998-12-08 W&H Dentalwerk Gmbh Laser dental devices and methods
US6090102A (en) * 1997-05-12 2000-07-18 Irvision, Inc. Short pulse mid-infrared laser source for surgery
FR2842413B1 (fr) * 2002-07-18 2005-06-03 Univ Lille Sciences Tech Appareil pour le traitement de la degenerescence maculaire liee a l'age (dmla)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6075056A (ja) * 1983-07-06 1985-04-27 レ−ザズ　フオア　メデイスン　インコ−ポレ−テツド 眼科の顕微手術装置および方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8702884A1 *

Also Published As

Publication number Publication date
JPS63501844A (ja) 1988-07-28
DE3540763A1 (de) 1987-05-21
WO1987002884A1 (fr) 1987-05-21

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Inventor name: MENNICKE, HARTMUT