RU2306958C2 - Catheter for long-time catheterization of main vessels and their branches - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: catheter can be used for diagnostics and medicinal purposes. Catheter for log-time catheterization of main vessels and their branches is made of plastic tube. Tune has welded end of 3-5 mm length; it has spherical or oval-shaped edge with mirror-smooth surface and with three openings - one main and two ancillary ones. Main opening has cross-section area being equal to 2-3 areas of internal cross-section of plastic tube. Ancillary openings are disposed in opposition along diameter and they are disposed close to main opening in such a way that plane of fluid's efflux out of them should be perpendicular to plane of fluid's efflux from main opening and discharge of liquid through ancillary openings shouldn't excess fluid discharge passing through main opening.

EFFECT: long-time and selective probing of main vessels without application of costly control devices.

2 dwg

Description

The invention relates to medicine and is used both for diagnostic and for therapeutic purposes.

An analogue of the invention is a catheter for probing and angiography with a lever-throttle system for controlling the end of the catheter by Med.-Tech. ("Guide to angiography." N.Kh. Rabkin, M .: Medicine, 1977, p. 19). The disadvantages of the analogue are the high price and unsuitability for a long multi-day infusion of drugs due to the rigidity of the design. A rigid catheter drops out of the branches of the great vessels and is expelled by blood and tissues.

The prototype of the invention is a magnetic probe catheter for examining cerebral vessels (US Patent N 3358676 H.N. Nenfeld). The controllability of the end of the magnetic catheter probe is achieved by an external constant or alternating magnetic field. At the end of the catheter probe, one or more magnetic cylinders 3-5 mm long are mounted. The catheter probe is less rigid than other analogues, it is well retained in the branches of the trunks, but here very expensive control equipment and the end of the catheter can not get into the branches of the main vessels extending at right angles.

The objective of the present invention is to provide a catheter for long-term selective sensing of the great vessels and their branches without the use of expensive control devices that can be in the external tissues and in the lumen of the vessels for as long as the pacemaker electrodes in the cavity of the right ventricle of the heart.

The problem is solved in that the catheter has a sealed end with a length of 3-5 mm with a spherical or oval end face with a mirror-smooth surface and three holes - the main and two auxiliary; the main hole has a cross-sectional area equal to 2-3 areas of the inner cross section of the plastic tube; auxiliary holes are diametrically opposite and are located near the main hole so that the plane of the fluid flow from them is perpendicular to the plane of the fluid flow from the main hole, and the flow rate of the liquid through them does not exceed the flow rate of the liquid through the main hole.

Figure 1 shows the end of the catheter in a section, where 1 is a plastic tube, 2 is the main hole, 3 is a sealed end with a mirror-smooth surface, 4 are auxiliary holes.

Figure 2 shows a diagram of the hydroreactive control of the end of the catheter. Here 5 is the wall of the main vessel, 6 is the branch of the main vessel, 7 is the direction of fluid flow through the catheter, 8 is the direction of fluid flow from the hole, 9 is the position of the catheter after reactive deflection and bending, 10 is the direction of blood flow in the line.

The plastic tube 1 is made of thermolabile plastic.

The main opening 2 serves for hydroreactive bending and pushing the end of the catheter.

A sealed end with a mirror surface 3 allows the catheter to slide inside the vessel.

Auxiliary holes 4 are designed for axial fixation of the catheter at the time of the impulse.

Figure 2 shows a diagram of the hydroreactive control of the end of the catheter in the region of the main vessel 5 and the branch from it of the vessel 6.

Work with a catheter is as follows.

In an X-ray or operating room equipped with a portable X-ray machine with an electronic transducer, a small branch is exposed by known accesses (for example, the lower epigastric artery or vein, the internal thoracic artery or vein). Through a lateral incision of the branch, the catheter along the bends inside the vascular bed is led into the trunk (for example, the thoracic or abdominal aorta, into the superior or inferior vena cava). Under the screen, along the bone landmarks, the end of the catheter is installed at the desired level (for example, at the level of renal artery or vein discharge). 10 ml of contrast is injected into the catheter by a pulse under a pressure of 1-4 atmospheres and the screen shows how the catheter “flies” into the desired artery or vein. Then the catheter is held deeper and is fixed in the wound to the vessel and surrounding tissues. The outer end of the catheter is discharged through the skin, fixed to it, closed with a special connector and placed in a special bandage-pocket.

Thus, due to the design features, the catheter allows for long-term and selective probe of the great vessels and their branches.

Claims (1)

A catheter for long-term catheterization of the main vessels and their branches, consisting of a plastic tube and a working end with holes, characterized in that it has a sealed end 3-5 mm long with a spherical or oval end face with a mirror-smooth surface and three holes - the main and two auxiliary; the main hole has a cross-sectional area equal to 2-3 areas of the inner cross section of the plastic tube; auxiliary holes are diametrically opposite and are located near the main hole so that the plane of the fluid flow from them is perpendicular to the plane of the fluid flow from the main hole, and the flow rate of the liquid through them does not exceed the flow rate of the liquid through the main hole.

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