Surgery – Truss – Pad
Patent
1987-11-23
1989-12-05
Thaler, Michael H.
Surgery
Truss
Pad
A61B 1732
Patent
active
048845698
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to surgical instruments and, more specifically, to devices for ophthalmologic operations.
BACKGROUND OF THE INVENTION
Known in the prior art is a device for ophthalmologic operations comprising a holder carrying a longitudinally-movable cutting instrument and a stop (cf., SU, A, 1016882).
This device fails to provide for a sufficiently high standard of surgical operations since the incision does not follow the required ideal curve.
Another device for ophthalmologic operations known in the prior art comprises a holder and a stop located on said holder and interacting with the surface of the eye cornea during the operation. The holder accommodates a spring-loaded rod one end of which carries a cutting instrument with a catch while its other end is provided with a micrometric thread for moving said rod inside the holder by means of a nut.
Such device also fails to provide a sufficiently high accuracy of setting the cutting instrument to the present value which impairs the accuracy of the operation.
Besides, the device is difficult to handle which affects adversely the quality of surgery and requires a certain time to get the device ready for use, thus impairing its efficiency.
SUMMARY OF THE INVENTION
The main object of the invention is to provide a device for ophthalmologic operations which would ensure a high accuracy of setting the cutting instrument to the desired value by modifying the design of instrument-setting elements.
This object is accomplished by providing a device for ophthalmologic operations comprising a holder, a stop located on said holder and interacting with the surface of eye cornea during the operation, a cutting instrument with a catch secured on a spring-loaded rod accommodated inside the holder and carrying a micrometric thread on the other end, said thread intended for moving said rod inside of said holder, and a nut interacting with said rod for moving the latter which, according to the invention, has a thrust bushing mounted on the holder by means of the micrometric thread cut at the side opposite to the stop, and a catch which fixes the position of the thrust bushing relative to the holder, said catch being installed on the thrust bushing and interconnected with the nut.
This design promotes the accuracy of setting the stop and, consequently, the cutting instrument with relation to the eye cornea.
It is expedient that the catch of the thrust bushing should contain a spring-loaded lever whose axle is hinged on the external side surface of said bushing and whose one end interacts with the slots on the holder and thrust bushing, said slots getting in line for fixing the position of the thrust bushing, the slot on the thrust bushing being of a through type, and the other end of the lever interacts with the nut by means of flutes made on both of them.
It is likewise expedient that the micrometric thread of the rod and thrust bushing should have different pitches.
BRIEF DESCRIPTION OF THE DRAWINGS
Now the invention will be described in detail by way of example with reference to the appended drawings in which:
FIG. 1 shows a device for ophthalmologic operations according to the invention, longitudinal section;
FIG. 2 shows the same device, view of micrometric screw scales along arrow A.
FIG. 3 shows the same device, section along line III--III in FIG. 1.
BEST MODE FOR CARRYING OUT THE INVENTION
A device for ophthalmologic operations contains hollow holder 1 (FIG. 1) made up of two members 2 and 3 interconnected by screw 4. The member 2 of the holder 1 has a stop 5 interacting with the surface of eye cornea during operations while the member 3 of the holder 1 bears a coarse scale 6 (FIG. 2). Accommodated inside of the holder 1 (FIG. 1) is a rod 7 loaded by a spring 8, said rod carrying a cutting instrument 9 secured by a catch 10. The other end of the rod 7 has a micrometric thread 11 with a pitch t.sub.1, said thread enabling the rod to interact via a shaft 12 with a nut 13 during installation of the cutting instrument 9.
The mem
REFERENCES:
patent: 3967377 (1976-07-01), Wells
patent: 4473076 (1984-09-01), Williams et al.
patent: 4499898 (1985-02-01), Knepshield et al.
Degtev Evgeny I.
Fedorov Svyatoslav N.
Ivashina Albina I.
Karavaev Alexandr A.
Soloviev Sergei A.
Mezhotraslevoi Nauchno-tekhnichesky Komplex "Mikrokhirurgia Glaz
Thaler Michael H.
LandOfFree
Device for ophthalmologic operations does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for ophthalmologic operations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for ophthalmologic operations will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2028327