CZ2013385A3 - Trepan for cornea transplantation - Google Patents

Abstract

The Trepan includes a surgical cutting tool (1) for cutting and marking the corneal donor tissue membrane (8) for unambiguous positioning of the back and cheeks during the subsequent transplantation process, particularly in the so-called lamellar endothelial transplantation process. The working part of this cutting tool (1) is formed by a tubular body (1a) with a cutting edge (2) at the end. This cutting edge (2) of the tubular body (1a) of the cutting tool (1) is provided with asymmetrically shaped and / or asymmetrically arranged notches (2a) to mark the donor tissue membrane (8) for correct positioning during subsequent transplantation, wherein the upper and lower the side of the cut graft unequivocally distinguished by the edge relief on its perimeter.

Description

Trepan for corneal transplantation

Field of technology

The invention relates to a corneal transplant shaker, which is intended to be used for cutting and marking the membrane of donor corneal tissue for transplantation for its correct positioning during subsequent transplantation.

Current state of the art

During corneal transplantation, the fundamental problem of correct positioning of the donor tissue arises. To ensure the necessary accuracy of tissue placement and the safety of the entire tissue transfer process, for example, the device according to Japanese patent application 2002136540 is used. However, this is a relatively complicated and expensive surgical device.

The methods of precise positioning of the corneal tissue during the transplantation process are also addressed in the international patent application PCT WO 2008030718 and the Russian patent 2187989. However, in all cases mentioned, it is a so-called penetrating transplant, where the entire cornea is cut through and through (thickness about 1mm). Accurate identification (marking) of the back and side of the tissue during so-called lamellar transplantation, e.g. endothelium, when only a 10 micrometer thin inner layer of the cornea is used, has not yet been successfully solved.

The essence of the invention

The trepan for corneal transplantation according to the invention contributes to a large extent to the elimination of this problem. It is a device that contains a surgical cutting tool designed to cut and mark the membrane of donor corneal tissue, while the working part of this tool is formed by a tubular body with a cutting edge at the end. The essence of the invention is that the cutting edge of the tubular body of the cutting tool is provided with asymmetrically shaped and/or asymmetrically arranged notches, which are located in such a way that in a plane perpendicular to the axis of the tubular body of the cutting tool, they modify the circular circumference of its cutting edge to clearly identify the reverse and the side of the cut membrane of the donor tissue according to the relief of the edge on its circumference.

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The main benefit of the shaker solution according to the invention lies in the easy and completely precise and unambiguous positioning of the back and side of the membrane of the donor cornea tissue during the transplantation process, especially during the process of the so-called lamella transplantation of the endothelium.

Overview of images on the drawings

For a more detailed explanation of the essence of the invention, the attached drawings are used, where Fig. 1 represents the overall assembly of a shaker for cornea transplantation, Fig. 2 - a detail of the working part of the cutting tool of the shaker.

An example of an embodiment of the invention

The assembly of a shaker for corneal transplantation - a device containing a surgical tool intended for cutting and marking the membrane of donor tissue for transplantation - in an exemplary embodiment (see Fig. 1) is formed by a stand 4 with a base 5, while a plastic bed 6 for the membrane is formed on the base 5 donor tissue 8 and in the stand 4 above this bed 6, fixed and against the stand 4 by a spring 3_suspended surgical cutting tool 1 for cutting and marking the membrane of the donor tissue 8 of the cornea. The coupling 2 opens into the bed 6 for connecting the plastic tube for controlling the vacuum fixation of the tissue.

The working part of the cutting tool 1 of the shaker (see detail in Fig. 2) is formed by a tubular body 1a, typically metal, with a cutting edge 2 at the end. The essence of the invention is that the cutting edge 2 of the tubular body 1 is provided with asymmetrically shaped and/or asymmetrically arranged hook-shaped notches 2a to mark the cut membrane of the donor tissue 8 for its correct positioning during subsequent transplantation. As can be seen from Fig. 2, asymmetrically shaped and/or asymmetrically arranged notches 2a are shaped and located on the circumference of the cutting edge 2 of the tubular body 1 of the shaker in such a way that the upper and lower sides - the reverse and the face of the cut transplant are then clearly distinguished according to the reliefs of the edge on its circumference.

Claims (1)

PATENT CLAIM Trepan for corneal transplantation, containing a surgical cutting tool for cutting and marking the membrane of the donor tissue of the cornea for transplantation, wherein the working part of this cutting tool is formed by a tubule body with a cutting edge at the end, characterized in that the cutting edge (2) of the tubule body (la ) of the cutting tool (1) is provided with asymmetrically shaped and/or asymmetrically arranged notches (2a), which are located in such a way that in a plane perpendicular to the axis of the tubular body (la) of the cutting tool (1) they modify the circular circumference of its cutting edge (2) to unambiguously identify the reverse and face of the cut membrane of the donor tissue according to the relief of the edge on its circumference.