SU1680160A1 - Method for manufacturing optical devices to supply laser radiation into the eye - Google Patents

Abstract

The invention relates to medicine, namely to ophthalmology, and relates to methods for manufacturing elements of ophthalmic optics for introducing laser radiation into the eye. The purpose of the invention is to increase the safety of laser interference. In the manufacture of optical elements introducing laser radiation into the eye by machining a glass surface to the contact surface of the optical element facing the eye block, a layer of laser-resistant polymer is polymerized using radical polymerization, after which the optical element is molded by pressing at a temperature of 105-120 & The temperature of the polymer layer is 0.5-1.5 mm.

Description

The invention relates to medicine, namely to ophthalmology, and relates to methods for manufacturing elements of ophthalmic optics for introducing laser radiation into the eye.

The aim of the invention is to increase the safety of laser interference.

The method is carried out as follows. A mixture of methyl ester of methacrylate acid and glycerol triacetate is prepared with a content of the latter 10-30% by volume. The resulting monomer is filtered through a membrane or glass filter with a pore diameter of not more than 10 microns, and then it is sparged with an inert gas.

The output spherical surface of the optical element designed

for the application of a protective layer, treated with a 1% solution of vinyltrichlorosilane in heptane and dried under room conditions. A mold for casting said prepolymer is placed on the output part of the optical element. After filling with the prepolymer, the mold is tightly compressed with a clamping screw, the mold assembly with the gonioscope is placed in a thermostat, and polymerization is performed at a temperature of 50 ± 10 ° C for 20-25 hours.

After completion of the polymerization, the assembly is placed in an oven and maintained for 3 hours at 110 ° ± 5 ° C. After cooling to ambient temperature, the assembly is disassembled and the resulting protective layer is formed.

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The molding is carried out using a spherical forming element with a given radius of curvature. Using the clamping screw, the spherical surface of the forming element is pressed against the surface of the polymer layer, at the same time producing hot air, thus heating the polymer to a temperature of 105-120 ° C. Gradually pressing the forming element with a clamping screw, continue the molding process until the specified thickness of the polymer layer is reached. AT . In this position, the molding is continued for 10-15 minutes, after which the supply of hot air is turned off and cooling is performed. The layer from the end surface of the polymer layer is removed by mechanical treatment.

Example 1. The manufacture of goniopes

Prepare a mixture of methyl ether of metacryloic acid and glycerol triacetate in a volume ratio of 80:20. The resulting monomer is filtered through a membrane filter with a pore diameter of 8 μm, after which they are arbotrated with an inert gas. „

The output spherical surface of the gonioscope, van Beuningens, is treated with a 1% solution of vinyltrichlorosilane in heptane and dried under room conditions. A mold is poured onto the output part of the gon & scraper to prepare the prepolymer prepared by the above method, then the mold is compressed tightly with a clamping screw, the mold assembly with a helioscope is placed in a thermostat, and polymerization is performed at 50 ° C for 24 hours. in a drying oven for 3 hours at 110 ° C. After cooling to ambient temperature, the assembly is disassembled and the resulting protective layer is formed. With the help of a clamping screw, the spherical surface of the forming element with a radius of curvature of 8 mm is pressed against the surface of the polymer layer, simultaneously producing hot air and thus heating the polymer to a temperature of 105 ° C. Gradually pressing the forming element with a clamping screw, continue the molding process until the thickness of the polymer layer reaches 0.5 mm, and in this position, the molding is continued for 10 minutes, after which the supply of hot air is turned off and the cue. The bluff from the end surface of the polymer layer is removed by machining,

Example 2, the Manufacture of goniolinza.

The monomer is prepared in this way (see Example 1),

Goniolinse exit surface

MM. Krasnov is treated with a solution of vinyl trichlorosilane and dried at room temperature. On the exit part of the goniolinza, put in a mold for pouring.

0 prepolymer, and the polymerization is carried out analogously to example 1. The molding is carried out as follows. With the help of a clamping screw, the spherical surface of the forming element with a radius of curvature of 7.8 mm is pressed against the surface of the polymer layer, simultaneously producing hot air and thus heating the polymer to a temperature of 120 ° C. Gradually pressing

0 forming element with a clamping screw, continue the molding process until the thickness of the polymer layer reaches 1.5 mm, and in this position the molding is continued for 10 minutes, after

5 of which turn off the supply of hot air. After cooling mechanically, the strip is removed from the end surface of the polymer layer.

P p and iw e p 3. Manufacturing gonioscope.

0 The monomer is prepared analogously to examples 1 and 2.

The exit surface of the gonioscope is treated with a solution of vinyltrichlorosilane in heptane and dried in room

5 conditions The method described in examples 1 and 2 is used to polymerize a layer of laser-resistant polymer with a thickness of 3 mm, after which the molding is carried out in the described way at a temperature of 110 ° C until the thickness of the polymer layer is 1.0 mm. After cooling and removing from the end surface of the polymer layer.

The use of the proposed method of manufacturing optical elements for introducing laser radiation into the eye provides, in comparison with the prototype, a number of advantages, which together can significantly improve safety

0 laser interference Due to the presence of a protective polymer laser layer, the glass surface of the optical element is separated from its output surface in contact with

5 by the cornea, at a distance determined by the thickness of the polymer layer. Thus, when focusing the laser beam deep into the eye block in the plane

the location of the glass surface achieves a lower level of intensity of laser radiation as compared with the prototype and, accordingly, a reduction in the probability of breaking the glass surface with the formation of chips. Moreover, the destruction of the glass surface, if it does occur, does not result in injury to the eye due to the presence of a protective polymer layer between the glass surface and the cornea. In addition, the laser destruction of the actual polymer layer, which is improbable due to its laser strength, occurs without spalling, does not cause injury to the cornea, and does not prevent further use of the optical element.

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Claims (1)

Claims The method of making optical elements for introducing laser radiation into the eye by machining them, characterized in that, in order to increase the safety of laser interference, the surface of the optical element that is turned to the eye unit is treated with a solution of vinyltrichlorosilane in heptane, dried and primed with it by radical method. polymerization layer of laser-resistant polymer, followed by molding by extrusion of an optical element layer in contact with the eye at a temperature of 105-1 20 ° C to the thickness of the polymer layer 0.5-1.5 mm.