SU1722508A1 - Esophageal wire electrode - Google Patents

Description

An electrode for an ECG is not useful in this case, since it increases the energy losses of the stimulating pulses and thereby decreases the reliability of the rhythm-keeping. In addition, the swelling of the absorbent pad makes it difficult to remove the electrode introduced by the transnasal method.

The purpose of the invention is to extend the service life of the wire-electrode, providing optimal technical parameters for rhythm-driving and patient comfort.

This goal is achieved by the fact that the contact electrodes of the esophageal wire-electrode are made removable by means of a detachable threaded connection with cylindrical sleeves embedded in an insulating layer coaxially with the spiral core and connected to the corresponding conductors of the conductor. The contact electrodes are made of two or three counter parts, one of which, having the largest diameter, is made of an electrically conductive solid material with a porous structure.

FIG. 1 shows the design of the proposed esophageal wire-electrode; figure 2 - contact electrode of two parts in folding form; on fig.Z - the same, from three parts.

The esophageal wire-electrode consists of a conductor 1 with an insulating layer, contact electrodes 2 containing the material of a porous structure, and a connecting tip 3. Contact electrodes 2 are made removable from two to three electrode counter parts 4 and 5, which are worn and fixed with a threaded connection with cylindrical sleeves 6. The latter are mounted in the insulating layer of the conductor 1 coaxially with the spiral core 7 and connected to the corresponding conductors 8.

Contact electrodes 2 are made of pyrolytic carbon. You can make them from titanium powder based on powder metallurgy technology. Electrode counter parts 4 and 5 can be manufactured for a separate contact electrode 2 of different materials and different sizes with regard to mechanical strength, electrochemical stability and polarization properties of these materials, for example, electrode counter part 4 from pyrolytic carbon, counterpart 5 from metal electrode alloy and smaller sizes ..

The sleeves 6 are made of metal electrode alloy.

Use the proposed wire-electrode as follows.

Before use, contact electrodes 2 are formed: put the electrode counter parts 4 and 5 on the sleeves 6; twisting in opposite directions, they are brought together and fixed on the sleeves 6. Further actions are performed according to the generally accepted method: a wire-electrode is inserted into the esophagus through the nose to a depth of 40-50 cm; connect the connecting head 3 to the pacemaker and the electrocardiograph, then pull the wire-electrode back and on the largest amplitude of atrial potential or the smallest required for pacemaking

5 amplitude of the stimulating pulses determines its optimal position. Upon completion of the medical procedure, the contact electrodes are disassembled into electrode counter parts 4 and 5, they are removed from the current conductor 1, and the porous part 4 is discharged.

Thus, the invention retains for further re-use the main parts of the esophageal

5 wire-electrodes: conductor 1 with an insulating layer, spiral conductor 7 and other conductors 8 and connecting tip 3, as well as counter parts 5 of non-porous material.

0In addition, the invention involves

the possibility of forming contact electrodes 2 from electrode counter parts 4 and 5 of different sizes and properties of materials to ensure optimal technical parameters of rhythm-keeping and comfort for the patient.

Example. A prototype of the esophageal wire electrode was manufactured at the Kaunas Medical Academy by

0 revision of the wire-electrode diagnostic multi-contact mark PEDM-9, mass-produced SCR KP Kamyanets-Podilsky. The test was carried out in model conditions and in one

5 case checked in the clinic. The conditions of the model test were: a solution of 0.9% NaCI, an amplitude of stimulating pulses 20-50 V, a duration of 10 ms, a frequency of 1.2 Hz, polarization of the cathode and

0 anodna. The following functional parameters are defined: performance J; the polarization potential Un and the internal resistance of the signal source R,

5 Experimental data are tabulated.

From the presented data it follows that the proposed wire-electrode has advantages over the known.

Clinical case confirms the conclusion of the model test: marked

high stability of ECG isolines, more pronounced P and T teeth, which facilitates diagnosis, reducing the threshold amplitude of electrical stimuli by 10%. increased comfort for the patient by his own assessment.

Claims (1)

Claims An esophageal wire electrode containing a conductor with an insulating layer, the conductors of which are connected to contact electrodes including a porous element and a connecting tip, which is Compared with the fact that, in order to increase service life, ensure stability of the parameters of pacemaking and reduce discomfort, each contact electrode is provided with a cylindrical threaded sleeve connected to the housing and connected to it, which at least two counterparts are detachable. One of which, having the largest diameter, is a porous element made of an electrically conductive solid material. # Ш2 & M.4 / p #, 5