RU54772U1 - ASPIRATION AND IRRIGATION CANULA - Google Patents

Abstract

The utility model relates to medicine, in particular to instruments for excimer laser surgery, primarily for photorefractive keratectomy and LASIK surgery.

In an aspiration-irrigation cannula, including an aspiration tube with an inner channel and a working end bent at an obtuse angle, the working end of the aspiration tube and the inner channel in the zone of the working end are made with oval sections, while on the surface of the working end of the aspiration tube at equal intervals that are multiples of metric unit, made parallel to each other grooves.

As a result, the task of simplifying the design, expanding the functionality, and also providing the ability to determine morphometric characteristics directly in the process of surgical intervention and immediately after it is solved.

Description

The utility model relates to medicine, in particular to instruments for excimer laser surgery, primarily for photorefractive keratectomy and LASIK surgery.

Known suction and irrigation cannula ophthalmic containing a hollow body and a curved working part having side channels and a cavity communicating with the cavity of the body, RU 2195242.

This cannula has a complex structure.

Known suction-irrigation cannula, including an aspiration tube with an internal channel and a bent obtuse working end; the inner channel is conical, having a curly cross-section, monotonously expanding from the rounded end of the working end of the suction tube to the head of the vacuum supply from the suction system, RU 2067855.

This technical solution is taken as a prototype of this utility model. The disadvantage of the prototype is the very high complexity of manufacturing the device due to its extremely complex configuration. This complexity is practically unjustified, since it does not give a significant result in real conditions.

In addition, the device does not allow the ophthalmic surgeon to determine with a sufficient degree of accuracy during the operation and immediately after it the morphometric characteristics: the size of the cornea, the diameter of the pupil, the size of the flap and its legs (the part of the flap that is not cut during its surface cutting), the dimensions of the corneal bed . Knowing these characteristics directly during surgery significantly affects its quality, allows you to achieve the most positive treatment result, to eliminate or significantly reduce the risk of postoperative complications.

The round shape of the working end of the cannula does not allow, if necessary, along with the functions of aspiration and irrigation of the surgical field

quite effectively carry out manipulations with the superficial flap of the cornea, which generally limits the functionality of the prototype.

The objective of this utility model is to simplify the design, expand the functionality, and also provide the ability to determine morphometric characteristics directly during surgery and immediately after it.

According to the utility model, this problem is solved due to the fact that in the suction and irrigation cannula, including the suction tube with an internal channel and a working end bent at an obtuse angle, the working end of the suction tube and the internal channel in the area of the working end are made with oval sections, while the surface of the working end of the suction tube at equal intervals multiple to a metric unit, grooves parallel to each other are made.

The applicant has not identified sources of information about technical solutions containing a set of features identical to this utility model, which allows us to conclude that it meets the criterion of "novelty."

The essence of the utility model is illustrated by drawings, which depict:

figure 1 is a front view, combined with a longitudinal section;

figure 2 is a fragment of the working end of the suction tube in an enlarged scale;

figure 3 is a section aa in figure 1 on an enlarged scale.

The suction and irrigation cannula includes a suction tube 1 with an internal channel 2; the working end 3 of the suction tube 1 is made with an oval cross section and bent at an obtuse angle "α", comprising 120-150 °. Interior

channel 2 in the suction tube 1 to the working end 3 is made cylindrical with a circular cross-section, and in the zone of the working end with an oval cross-section. Thus, the working end 3 is flattened. On the surface of the working end 3 of the suction tube 1 at equal intervals, in a specific example 1 mm, grooves 4 are made. The depth of the grooves 4 is 0.03-0.1 mm and the width is 0.01-0.05 mm. In a specific example, the grooves are notched and have a depth of 0.05 and a width of 0.02 mm.

Using the cannula, both the irrigation of the operative field through the channel 2 of the suction tube 1 and the aspiration of the liquid medium from its surface are carried out. Aspiration occurs when the working end 3 of the suction tube 1 comes in contact with a liquid that accumulates within the surgical field; for irrigation in a specific example, you can use an elastic spray can filled with irrigation fluid (not shown in the drawings). During the operation, using the working end 3 of the tube 1, on the surface of which, at equal intervals multiple of 1 mm, grooves (notches) parallel to each other are made, determine the morphometric characteristics, which are extremely important for excimer surgery.

Knowing the size of the cornea during the operation allows you to correctly select the vacuum rings for adequate cutting of the surface flap. Data on the size of the pupil allows you to correctly determine the area of surgical intervention, the size of which should exceed the size of the pupil. Correct determination of the size of the legs of the superficial flap is very important to prevent postoperative astigmatism, as well as the correct direction of excimer radiation.

The implementation of the working end 3 of the suction tube 1 with an oval section and, accordingly, the channel 2 in the area of the working end 3 also with an oval section, can significantly expand the functionality of the tool; at the same time, not only washing and aspiration of the intergluteal space is carried out, but also they are lifted and laid on

the former place is a superficial flap of the cornea, and also smooth it in order to improve its adaptation and dehydration (reduce postoperative edema.)

The claimed aspiration-irrigation cannula ensures the performance of both normal functions (aspiration and irrigation), and allows for very important morphometric measurements during the operation, the design of the cannula is simple, its manufacture does not require special expenses.

For the manufacture of the device, widely used structural materials are used and, unlike the prototype, standard uncomplicated equipment, which, according to the applicant, determines the suitability of the utility model for the criterion of “industrial applicability”.

Claims (1)

Aspiration-irrigation cannula, including an aspiration tube with an inner channel and a working end bent at an obtuse angle, characterized in that the working end of the suction tube and the inner channel in the zone of the working end are made with oval sections, while on the surface of the working end of the suction tube at regular intervals multiples of the metric unit, grooves parallel to each other are made.