Method for manufacturing medical cutting tool

FIELD: medical engineering.

SUBSTANCE: method involves machining a billet giving it shape and sharpening the cutting part. Ruby monocrystal boules are used as raw material of the billet, grown up in crystallographic direction of [1011]. They are split into half-boules in [1120] direction, and then cutting into plates. Cutting is carried out in direction set in perpendicular to half-boule crystallographic axes. Before sharpening tool cutting part shaped as cutter, hydrothermal ruby monocrystal plates etching is carried out, to determine tool cutter cut-off directions in crystallographic directions of [1210], [1011] and [0111].

EFFECT: high precision cutting tool possessing increased strength and usable in eye microsurgery.

3 dwg

 

The invention relates to medical equipment, in particular the production of microsurgical instrument for ophthalmology (eye surgery).

Known microsurgical instrument (SU # 1424814, M. CL. And 61 In 17/32, 23.09.1988), which is made in the form of a cutter providing a force vcol instrument into the tissue of the eye by changing the orientation of the facets, reducing the thickness of the workpiece and angles of sharpening. However, not disclosed method of manufacture of the instrument and does not specify the material of the cutter.

Known microsurgical instrument (SU # 1463253, M. class. And 61 In 17/32, 07.03.1989), which indicates that the blade material tool made of single crystal with a cutting layer of silicon nitride, but is not disclosed to the manufacturing method.

The closest in technical essence is a method of manufacturing the instrument described in SU # 780840, M. class. And 61 In 17/32, 23.11.1980, including machining of the workpiece by punching or pressing with the shape of a flat plate with subsequent grinding and sharpening blades.

However, this tool is made of metal that has a low mechanical strength, not easy in the operations of eye microsurgery, because the source material and shape of the blade does not provide sufficient force vcol in the tissue of an eye.

The technical result used from the I present invention is a method of creating a tool with high strength, applicable in ophthalmic microsurgery.

The technical result is achieved by a method of manufacturing a medical cutting tool comprising machining the workpiece from the source material, giving it shape and sharpening of the cutting tool, in which the source material used boules of single crystal ruby grown in the crystallographic directionwith the split at polopoly in the direction ofand with the subsequent cutting of the latter on the plate, carried out in the direction perpendicular to the crystallographic axis polopoly. Thus, before processing and the sharpening of the cutting tool in the form of a cutter hydrothermal etching plates of the single crystal of ruby to determine the direction of cut of the cutter and grinding in the crystallographic directions,and.

It should be noted that the ruby crystal is grown by a known method of Vernes by melting in a flame of hydrogen-oxygen burner (Chernov A.A., Givargizov H. the Formation of crystals. In kN. Modern crystallography, in 4 volumes; Moscow: Nauka, 1980, s-356).

A known method of growing bulls ruby in crystallographic n the Board (Anglo. Properties of defects in optical crystals. The dissertation on competition of a scientific degree of the doctor of physico-mathematical Sciences, 01.04.07 - solid state Physics, Ufa, 1998, p.14-17).

Experimental studies have shown that the above crystallographic directions coincide with the strongest ties ions. This etching allows not only to highlight the direction of the cut blanks, but also to determine their defect: identify structure, the field of elastic stresses, it allows to determine the perfection of the source material. A longitudinal section of the workpiece is performed on the crystallographic direction, a cross-section in the direction ofand slanting cut in the direction of. Slicing a single crystal boules rubies grown in the direction ofwith the split planeeasy handling due to the fact that these surfaces are planes individually crystal.

Thus, this technology allows to avoid chips and burrs when cutting inserts and tool sharpening due to the crystallographic orientation of the slice tool identified hydrothermal etching. In addition, it should be noted that h is about as source material used is more durable single crystal of ruby, having a hardness on the Mohs scale 9, the elastic modulus is higher by almost two times, and the limit of elasticity of at least four times higher than the prototype (source material - metals).

Technical essence is illustrated by drawings: figure 1 is a given image-speed etching on the plane Rubin, close to the crystallographic orientation. Figure 2 - cut operation boules on polopoly with subsequent cutting of the last to cross the plate. Figure 3 - operation of the slicer cutter and grinding in crystallographic directions:,and.

Example. As the source material of the workpiece using a ruby crystal, grown by the Verneuil method in the crystallographic direction. For growing crystals of ruby powder of aluminum oxide with a mixture of chromium oxide is placed in the hopper above the burner flame, and the seed crystal ruby is placed in the lower part of the flame. Gradually powder spilling out of the hopper and passing through the flame of the burner, popravlyaetsya and in the molten state falls in the form of a thin layer with thickness of 0.1 mm on the surface of the seed, where crystallization. The seed with a certain speed is lowered and the film of the melt continuously updates the crystal layer is a top. With a consistent flow of charge, hydrogen, oxygen and speed of seed lowering the film thickness of the crystal is maintained almost constant, and the crystal gradually takes the form of boules. The resulting boules split on polopoly in the direction of. Then probuly cut with saws on the plate perpendicular to the crystallographic axis of the crystal (figure 2). To determine the direction of the slice, take the plate sample from a single crystal of ruby, placed in an autoclave for etching. In the etching of the plate are detected pattern of selective etching: zonary structure, dislocations, blocking. In this case there are at least three directions with strong ties ions forming the crystal. In this case, the crystallographic directions,and(1, 3). In these areas produce slices sharpening cutter microsurgical instrument.

Thus, the present invention enables the manufacture of a microsurgical instrument with increased strength, at the expense of machining the workpiece from a ruby crystal with the orientation of the slice to avoid chipping and burrs. According to the proposed technology received the instrument m is the minimum force vcol cutter tool into the tissue of the eye when conducting operations in ophthalmology.

On the proposed technology can be made the tool and for other surgical operations.

A method of manufacturing a medical cutting tool comprising machining the workpiece by giving it shape and sharpening of the cutting part, wherein as starting material used boules of single crystal ruby grown in the crystallographic directionand break them on polopoly in the direction ofwith subsequent cutting of the latter on the plate, carried out in the direction perpendicular to the crystallographic axis probuly while before sharpening of the cutting tool in the form of a cutter hydrothermal etching plates of the single crystal ruby direction of cut of the cutter tool in the crystallographic directions,and.



 

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