US3871753A - Ophthalmological fixation lamp assembly - Google Patents

Ophthalmological fixation lamp assembly Download PDF

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Publication number
US3871753A
US3871753A US351847A US35184773A US3871753A US 3871753 A US3871753 A US 3871753A US 351847 A US351847 A US 351847A US 35184773 A US35184773 A US 35184773A US 3871753 A US3871753 A US 3871753A
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United States
Prior art keywords
collimator
lamp assembly
fixation lamp
patient
assembly according
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Expired - Lifetime
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US351847A
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English (en)
Inventor
Hans Papritz
Kurt Hagi
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Haag Streit AG
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Haag Streit AG
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Publication date
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/13—Ophthalmic microscopes
    • A61B3/135—Slit-lamp microscopes

Definitions

  • ABSTRACT This invention relates to a fixation lamp assembly for an ophthalmological instrument, having a head rest for a patient, a light collimator, and bearing means disposed between the head rest and the collimator allowing adjustment of the collimator relative to the head rest about at least two axes intercepting the optical axis of the collimator in the center of rotation of an eye of the patient.
  • the patient is able to recog nize the fixation mark of the collimator in an position within his field of vision with ease and uniform quality. without turning his head.
  • This invention concerns an ophthalmological fixation-lamp assembly movable about at least two different axes while maintaining proper focal alignment relative to the eye of a patient.
  • a fixation lamp is typically used to fix the direction of sight of the eye of a patient so as to facilitate ophthalmological examination.
  • the patient should be able to recognize a fixation-mark, photograph, or other indicia of the fixation lamp throughout his field of vision with ease and similar quality, without turning the head.
  • This is obtained according to the present invention in that a collimator is hinged around two axes which intersect the collimator optical axis in the center of motion of the eye.
  • FIG. I is a side elevational view of a fixation lamp assembly according to the present invention.
  • FIG. 2 is a partial top plan view with parts broken away of the guide of the fixation lamp assembly looking in the direction of the arrow II in FIG. 1;
  • FIGS. 3 and 4 are partial sectional views of details of the assembly of FIG. 1'
  • FIG. 5 is a partial sectional view taken along line V ⁇ / in FIG. 4;
  • FIG. 6 is a partial view taken along line VI-VI in FIG. 2.
  • the shown fixation-lamp is attached to a holder, from which two lateral supports I and 2 are shown. These supports are fixed on a table or the like, which is not represented. and on which an instrument, for instance a slitlamp, may also be attached for examining an eye of the patient.
  • the patient can put his forehead against a ribbon or head support band 3, which is connected with the supports 1 and 2.
  • the position of the eyes, from which one (4) is schematically drawn in FIG. 1, may be approximately determinated relative to the holder and its supported fixation lamp.
  • the holder has a yoke 5 which extends between the ends of the supports and in which a carriage 13 can be moved along a straight guide.
  • an extension arm 6 having parts 6a and 6b which are connected by a vertical-axial joint 7.
  • a bent, substantially L-shaped collimator 8 is hingedly mounted on bearings. and contains a lamp 4] and a fixation-mark, whose image can be viewed through a lens 9 and a mirror 10.
  • FIG. 1 shows, the axis A of the joint 7 axis B, of the bearing of the collimator 8, and axis C of the lens 9 intersect at the center of rotation of the eye 11.
  • FIGS. 2, 4 and 6 show the construction of the straight guide for the fixation lamp.
  • a guide bar 12 Between the side flanges of yoke 5 is fixed a guide bar 12, on which the carriage 13 is exactly guided along axial bearings.
  • the carriage is secured against swinging around guide bar 12 by bearings which run in a groove 14 of yoke 5.
  • the bearings 15 are excentrically fixed on pivots 16 (FIG. 6) which are disposed in holes and are secured against rotation by screws 17.
  • pivots 16 When the screws are loosened, the pivots 16 can be rotated until the bearings 15 rest against the walls of the grooves to guide the carriage without play in the desired position. Then the screws can be fastened.
  • the carriage is provided with adjustable stops 18, which determine the limits of travel.
  • a stoprail 19 with two stop recesses or detents 20.
  • an index roller 21 which cooperates with the stop recesses and determines either of two positions of the carriage in front of the respective eyes of the patient.
  • the inclined edge-surfaces l9a of the stop rail l9 are explained below.
  • a spring-loaded, insulated brush 24 which is located in the support part 6a pushes at one end against the rail 22 and is connected at the other end by a biasing spring to a conductor 25, which is located in the arm support 6.
  • the joint 7 of arm 6 (FIGS. 4 and 5) has a plate 26 which is connected with support part 60 and a plate 27. which is connected to support part 6b.
  • a disk 29 On the hub 28 of plate 26 is pivoted a disk 29, which is connected to plate 27 and presses against a friction liner 31 under the action of star-spring 30which is also mounted on hub 28.
  • parts 60 and 6b are hingedly connected. but the turning movement can only be transmitted by overcoming a certain amount of friction.
  • the collimator 8 (FIG. 3) is attached over a tube 32 and secured with a bolt 33 and nut 34 which a slot in the end of the collimator.
  • the tube 32 is pivoted in a bore of the lower, enlarged end of part 6b. It has a groove 35 accommodating a springloaded ball 36. This ball causes a certain friction in the pivot bearing oftube 32 and, because of the small distance to the pivot 46. prevents axial displacement.
  • the conductor 25 is guided over a terminal and a springloaded brush 37 to a slipring 38 which is fastened in an insulated manner on tube 32.
  • the slipring has an external insulation layer 39 which serves as an operating handle for the turning of tube 32 and collimator 8.
  • the slipring is connected by a threaded member, which is disposed in the hollow operating handle, to an insulated spring-loaded contact 40, which is inside tube 32.
  • This contact 40 is connected over a common spring to a spring-loaded contact 42 which presses against the central pin of lamp 41.
  • a tube 43 which can be adjusted with knob 44 in an axial direction and which remains in the adjusted position by friction.
  • opaline body 45 In the front end of tube 43 is disposed on opaline body 45 having a fixation mark.
  • the zero position of tube 43 is chosen such that the fixation mark is in the focal point of lens 9.
  • a normal-sighted patient sees the image of the fixation mark at infinity.
  • the fixation mark can be adjusted by the handle with the aid ofa scale (not shown) on collimator 8, so that the mark appears in focus.
  • the patient places his forehead against band 3 and his chin on an optional chin support (not shown).
  • the carriage I3 is then moved to a detentdetermined position in which it is approximately aligned over the patient s eye which is not to be exam ined.
  • the current for the lamp 4] flows over conductor 23. rail 22. brush 24. conductor 25, brush 37. slipring 38. contacts 40 and 42, and lamp 4] to ground.
  • the examiner can then fully control eye position for substantially the entire range of eye movement provided axis A of joint 7 and axis B of the collimator go through the center of rotation 11 of the eye. An eventual correction can be made through a slight lateral displacement of the head of the patient, for example. by varying the height of the chin rest.
  • the fixation mark is visible to the patient at all positions ofjoint 7, as well as collimator 8, if lens 9 is in his field of vision.
  • This condition is fulfilled at a minimum angle of 45 between the horizontal rotation axis B and the optical axis C.
  • the eye to be examined follows the movements of the eye which looks at the fixation mark and stays in the fixed direction during examination.
  • the carriage is displaced by the mean eyes-distance to the other stopposition. The adjustment is the same as described above.
  • the carriage is moved over the stop-position on one side, to an endposition, which is determinated by the stops 18, whereupon the index roller 21 comes to rest on one of the inclined edge-surfaces 19a of stop rail 19 and thus secures the carriage. With fine adjustment of the stops it is possible to determine exactly the end positions.
  • support part 6a may not be fastened to a carriage which can be moved along yoke 5, but can be hinged directly to the yoke with a joint similar to joint 7.
  • This joint has preferably means for stops. which determines two rotational positions of part 6a. so that axis A ofjoint 7 goes through one of both eyes of the patient for each of those turning positions.
  • part 60 can be made to swing past the stop position of the joint in two positions of rest, if the fixation lamp is not used.
  • the resistance in the stop positions of part 6a must be such, that part 6h can be turned around without turning part 60 out of its stop position.
  • An ophthalmological fixation lamp assembly comprising a head-rest for a patient; a light collimator having an optical axis; bearing means coupling said collimator to said head-rest for movement of said collimator about a plurality of axes intercepting one another at a position corresponding to the center of rotation of an eye of the patient, said bearing means constraining the optical axis of said collimator to pass through said position of interception independently of the position of said collimator about said plurality of axes whereby said eye may be fixed at any position while the other eye of the patient is examined; said bearing means ineluding guide means disposed over said head-rest for enabling horizontal movement of said collimator relative to said head-rest for bringing the collimator in front ofeither eye of the patient; said guide means having a guide element fixedly attached over said head rest, and carriage means movable along said guide element; and said bearing means having a first arm extending from said carriage means, and a second arm pivotally connected with said first arm for
  • fixation lamp assembly according to claim I wherein said second arm is provided with an insulated brush connected to a source of operating potential. and said collimator is provided with an annular electrical contact cooperating with said brush to provide said potential to said collimator.
  • fixation lamp assembly according to claim 1 wherein said guide means further comprises means cooperating with said carriage means to determine the horizontal position of said collimator in front of the eyes of the patient.
  • fixation lamp assembly according to claim wherein one of said plurality of axes is horizontal and another is vertical.
  • fixation lamp assembly according to claim wherein said collimator has fixation indicia and means for moving said indicia in both directions out of the focal point of the collimator lens.
  • fixation lamp assembly according to claim I. wherein said guide element is provided with an insulated rail, electrically connected to a source of operating potential, said rail being in contact with a brush. which is electrically connected to said collimator.
  • said guide means includes stop means cooperating with said carriage means to determine rest and end positions of said carriage means outside an opera tion range.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)
US351847A 1972-04-24 1973-04-17 Ophthalmological fixation lamp assembly Expired - Lifetime US3871753A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH602572A CH569465A5 (ja) 1972-04-24 1972-04-24

Publications (1)

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US3871753A true US3871753A (en) 1975-03-18

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US351847A Expired - Lifetime US3871753A (en) 1972-04-24 1973-04-17 Ophthalmological fixation lamp assembly

Country Status (5)

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US (1) US3871753A (ja)
JP (1) JPS5250478B2 (ja)
CH (1) CH569465A5 (ja)
DD (1) DD103807A5 (ja)
FR (1) FR2181926B1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7670003B2 (en) 2007-07-26 2010-03-02 Ophthalmology Associates of Northwestern Ohio, Inc. Examination assembly with improved access for the wheelchair bound patient
US20130148082A1 (en) * 2010-09-02 2013-06-13 Kowa Company, Ltd. Fixation lamp for ophthalmological instruments

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201795A (en) * 1960-04-12 1965-08-17 Oculus Optikgerate G M B H Support for a plurality of eye examination instruments
US3475075A (en) * 1964-03-30 1969-10-28 William Stone Jr Instruments provided with optical systems and means for adjusting their optical axes
US3588234A (en) * 1968-03-18 1971-06-28 Paul Frederic Gambs Optical device for moving a luminous target across the eyes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413056A (en) * 1964-08-31 1968-11-26 Tokyo Kogakukikai Kabushiki Ka Device for ophthalmic instrument for adjusting interpupillary distance and angle of convergence of lens cases
GB1197989A (en) * 1967-11-09 1970-07-08 Bernard Delacour Beamish Improvements in Adjustable Mountings for Optical Instruments

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201795A (en) * 1960-04-12 1965-08-17 Oculus Optikgerate G M B H Support for a plurality of eye examination instruments
US3475075A (en) * 1964-03-30 1969-10-28 William Stone Jr Instruments provided with optical systems and means for adjusting their optical axes
US3588234A (en) * 1968-03-18 1971-06-28 Paul Frederic Gambs Optical device for moving a luminous target across the eyes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7670003B2 (en) 2007-07-26 2010-03-02 Ophthalmology Associates of Northwestern Ohio, Inc. Examination assembly with improved access for the wheelchair bound patient
US20130148082A1 (en) * 2010-09-02 2013-06-13 Kowa Company, Ltd. Fixation lamp for ophthalmological instruments
US9089260B2 (en) * 2010-09-02 2015-07-28 Kowa Company, Ltd. Fixation lamp for ophthalmological instruments

Also Published As

Publication number Publication date
DE2316399B2 (de) 1976-04-22
DE2316399A1 (de) 1973-11-08
FR2181926B1 (ja) 1976-05-28
JPS5250478B2 (ja) 1977-12-24
CH569465A5 (ja) 1975-11-28
DD103807A5 (ja) 1974-02-12
FR2181926A1 (ja) 1973-12-07
JPS4948185A (ja) 1974-05-10

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