Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/10—Beam splitting or combining systems
  • G02B27/12—Beam splitting or combining systems operating by refraction only
  • G02B27/126—The splitting element being a prism or prismatic array, including systems based on total internal reflection
• • 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
  • A61F9/00821—Methods or devices for eye surgery using laser for coagulation
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/10—Beam splitting or combining systems
  • G02B27/14—Beam splitting or combining systems operating by reflection only
  • G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors

Definitions

• the invention relates to a spa lamp device according to the preamble of claim 1.
• Such slit lamp devices are used, for example, with neodymium-YAG lasers for the treatment of the front sections of the eye and with argon lasers for the coagulation of the back of the eye.
• Slit lamp devices for laser treatment of the eye according to the preamble of claim 1 are known for example from DE 33 31 431 AI.
• slit lamp devices have prisms as deflection devices for the light of the slit projector, as the lighting device for the area of the eye to be treated.
• the reason for this is likely to be that in slit lamp devices according to the preamble of claim 1, in which the deflection device is mounted in the immediate vicinity of the slit lamp microscope, the risk of damage to deflection devices consisting of simple flat mirrors, which in a conventional manner on the slit projector are attached is too large.
• a disadvantage of such slit lamp devices in which the deflection device is arranged below and thus outside the beam path of the slit lamp microscope, is that, because of the large marginal beam angles of the illuminating and treatment light, shadowing of the illuminating beam by the contact glass or the pupil size is unavoidable. This affects in particular in operations of the rear eye media, e.g. B. the vitreous.
• the prisms used in slit lamp devices according to the preamble of claim 1 have the disadvantage that they produce disturbing reflections in the beam path of the treatment laser and, moreover, "shade" the observation beam path.
• the invention is based on the object of specifying a slit lamp device for treating the eye, in which neither shadowing of the illuminating beam path by offset beam paths nor a comparatively large shading of the observation beam path by prisms or the like introduced into this beam path occurs.
• a slit lamp device according to the preamble of patent claim 1 is further developed in that a glass plate is used as the steering device of the slit projector, on which a mirror layer for the light of the slit projector is applied.
• the glass plate is held by means of at least one metal strip applied to the glass plate on an adjustment plate or an adjustment contact surface which has at least one magnet.
• the adjustment plate can be adjusted by means of at least one adjustment element.
• This thin glass plate which typically has a thickness of approximately 1 mm (claim 14), does not interfere with the observation beam path in practice, it being particularly advantageous if the plate protrudes beyond the boundary rays of the observation beam path (claim 13), because in this If no edges of the plate are visible in the observation beam path.
• the glass plate In order to avoid damage to the glass plate by careless movements of the operator or the person being examined, the glass plate is resiliently held on the adjustment plate, the alignment of which ensures the correct adjustment of the deflection device, ie the glass plate.
• magnets In order to hold the glass plate resiliently on the adjusting plate, magnets are used according to the invention, since such a "magnetic suspension" has the advantage of the lack of hysteresis, for example, compared to spring fastening Has.
• the mirror layer when using a treatment laser operating in the infrared region, is a wavelength-selective layer which, however, deflects the light of the slit projector r through the laser beam.
• the mirror layer typically reflects light with wavelengths less than approx. 700 nm and allows light with longer wavelengths to pass through. This ensures that the spa projector can be swiveled "directly in front of the laser beam path without" shadowing it ".
• the laser beam is split in a ring in front of the objective provided in the microscope housing in such a way that the laser beam passes through the glass plate outside the mirror layer. It is thus possible, even without using a wavelength-selective layer, to pivot the slit projector into the laser beam path without shadowing it.
• This solution can of course also be implemented with lasers operating in the infrared range, and has the advantage that no color distortions occur.
• the ring-shaped "splitting" of the laser beam can be carried out in accordance with claim 5 in that a first cone prism, which splits the laser beam into a conical beam with an annular cross-section, and a second cone prism are provided in the parallel beam path of the laser beam, which conical beam bundle "converts into a parallel annular beam path.
• the first Xegel prism has a boundary surface which has the shape of an inverted cone.
• the development of the invention characterized in claims 5 and 6 is particularly suitable for combination with a so-called wobble lens, as described in DE 35 32 464 AI, to the rest of the description of all terms not described here explicit reference is made.
• the wobble optics is arranged in the beam path in front of the first cone prism and preferably has at least one pivotable glass plate.
• the type of illumination can be changed from a gap into a ring, a half ring, etc. by changing the glass plate with a differently shaped mirror layer.
• the beam deflection according to the invention can be retrofitted to an existing gap processor at any time.
• FIG. 1 shows the basic optical structure of a slit lamp device according to the invention
• FIG. 2 shows a modification of the one shown in FIG
• Embodiment, and Figure 3a and b the slit projector of a slit lamp device according to the invention in section or in supervision.
• FIG. 1 shows the beam path of a slit lamp device, as described for example in DE 33 31 431.4.
• a laser beam 1 which in the exemplary embodiment shown is the beam of a laser operating in the infrared range, for example an NdYAG laser, is by means of an object.
• tivs 2 and a mirror 3 mirrored in the beam path of a slit lamp microscope 4 ' the optical elements of which only one front lens 5 is shown in FIG.
• the cone angle of the NdYAG laser beam (16 degrees) is also entered.
• a lens 6 of the so-called slit projector i.e. the illumination source and a deflecting device 7 of a gap projector, which is otherwise not shown and which is used to illuminate the eye 8 to be examined or treated.
• the deflection device 7 which will be described in more detail below with reference to FIG. 3, consists of a glass plate on which a mirror layer 11 is applied.
• this mirror layer is wavelength-selective, i.e. it is reflective for visible light and transmissive for light in the infrared range (wavelength 700 nm).
• the contact angle of the illuminating light is 10 °; the extension of the mirror layer 11 is selected accordingly.
• the diameter of the glass plate 7 is selected so that the glass plate extends beyond the observation beam path.
• FIG. 2 shows a modification of the exemplary embodiment shown in FIG. 1, in which, instead of the objective 2 in the beam path of the laser, a first prism 21, one boundary surface of which has an "inverted cone shape", and a second prism 22, the one boundary surface of which is the shape of a cone is used.
• the first prism 21 splits the laser beam into a "conical beam with an annular cross section ", while the second prism converts the laser beam into a parallel beam with a likewise annular cross section.
• a wobble lens 23, as described for example in DE 35 32 464 A1, are arranged in the beam direction in front of the first prism 21 in FIG.
• Such a wobble optic enables the spot size to be varied in a simple manner.
• 24 denotes an optical fiber from which the laser beam emerges.
• the laser light does not pass through the mirror layer II, but instead passes the glass plate 7 in a ring around the mirror layer 11.
• the use of the cone arrangement 21 and 22 for splitting the laser beam also has the advantage that the entire energy contained in the laser beam is split into the "ring"; no energy is lost.
• the “inner diameter of the annular parallel laser bundle” is dimensioned such that the laser beam passes through the glass plate 7 outside the mirror layer 11 when focused by the microscope objective 5. It should be taken into account that it is used to adjust the laser beam in the eye It is often advantageous to make the deflecting mirror 3 tiltable.
• the configuration shown in FIG. 2 is suitable both for lasers that generate light in the visible range and for lasers that generate light in the infrared range.
• the structure of the deflection device 7 is described in more detail below with reference to FIG. 2.
• the glass plate 7 forming the deflection device is provided with a mirror layer 11, the diameter of which in the exemplary embodiment shown is approximately 10 mm and which is transparent to an NdYAG laser beam (wavelength 1064 n or 132C nm).
• the mirror layer 11 is selected so that it reflects light with a wavelength of less than 700 nm, while allowing light with a wavelength of more than 700 nm to pass through, so that the HeNe target beam and the NdYAG treatment beam are unhindered by the glass plate 7 can pass through.
• the glass plate is provided with a metal strip 12, by means of which it can be attached to an adjusting block 13.
• the adjustment block 13 for this purpose has a 45 ° inclined adjustment plate or adjustment surface, in which two magnets 14 are introduced, for example sunk in.
• the adjustment block 13 is part of an adjustment platform or an adjustment head 15, which by means of three knurled adjustment screws 16 (compare FIG. 3b) and disc springs 17 against a housing 18 of the gap processor, of which only an axially adjustable lens 19 is shown in FIG. 2a, is adjustable.
• the deflecting device according to the invention the structure of which is described by way of example in FIG. 3 has a number of advantages:
• the glass plate When force is exerted on the glass plate, it is either moved or tilted slightly, but not broken. Due to the arrangement of two magnets, the glass plate always returns to its starting position after the application of force.
• the construction with a removable glass plate and with an adjustment platform enables both a simple change of the glass plate - for example to replace a damaged glass plate or to attach a glass plate with a differently shaped mirror layer - as well as the entire head:
• glass plates with slit-shaped, ring-shaped, partially mirrored mirror layers, but also glass plates with holes etc. can be used.
• the glass plate can be made very thin (up to a thickness of 1 mm) and therefore, due to the small thickness of the glass plate, there is no sharpness offset due to the glass plate. In the case of known slit lamp devices, this sharpness offset is particularly troublesome when the slit projector is swung out.

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• Health & Medical Sciences (AREA)
• Physics & Mathematics (AREA)
• Ophthalmology & Optometry (AREA)
• Optics & Photonics (AREA)
• Biomedical Technology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Surgery (AREA)
• Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Microscoopes, Condenser (AREA)
• Eye Examination Apparatus (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=6348765

Family Applications (1)

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• 1988
  • 1988-03-03 DE DE3806941A patent/DE3806941A1/de active Granted
• 1989
  • 1989-03-02 WO PCT/DE1989/000131 patent/WO1989007920A1/de not_active Application Discontinuation
  • 1989-03-02 JP JP1502717A patent/JPH02503391A/ja active Pending
  • 1989-03-02 EP EP89902930A patent/EP0373189A1/de not_active Withdrawn
  • 1989-03-02 FI FI895220A patent/FI895220A0/fi not_active IP Right Cessation

Non-Patent Citations (1)

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