JPH0523399A - Medical device with electrodes - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a medical device with electrodes that is unlikely to adversely affect diagnostic equipment using magnetism such as NMR-CT. [Structure] An electrode of a medical device with an electrode is made of a non-metal conductive material so that it is less likely to adversely affect a diagnostic device using magnetism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode, and preferably a medical device with an electrode, in which the electrode and the conductive wire are made of a non-metal conductive material.

[0002]

2. Description of the Related Art In recent years, CT, especially NMR-CT, has been greatly developed and generalized in the field of medical diagnosis. On the other hand, medical devices with electrodes are often used in the fields of medical diagnosis and treatment. As the medical device with electrodes, for example, there is a pacing catheter used to keep the activity of the heart normal when a disorder such as arrhythmia or heart failure occurs in the heart. In this pacing catheter, an electrode is attached to the tip of the catheter body, and a conducting wire conducted to the catheter body is connected to the electrode. This pacing catheter is inserted into the right ventricle via the vena cava, right atrium of a patient with a heart disorder, and the electrode attached to the tip of the catheter is positioned at the apex of the right ventricle to When the action potential is detected by the electrode, or when the change in the action potential of the heart to be detected is not detected, immediately the electrode is electrically stimulated from the electrode via the lead wire to activate the heart. . By the way, recently, in order to make a more detailed diagnosis of the condition of a patient, it is becoming more common to perform NMR-CT with the medical device with electrodes such as the pacing catheter attached. However, since the electrode portion of the pacing catheter and the like is made of metal, there is a drawback in that an image of a diagnostic device applying magnetism such as NMR-CT is disturbed and a good image cannot be obtained.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the conventional medical device with an electrode,
It is an object of the present invention to provide a medical device with electrodes that is unlikely to adversely affect diagnostic equipment using magnetism such as NMR-CT.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have achieved the above-mentioned object by making at least the electrode of the electrode or the conductive wire a non-metal conductive material. After finding out that, the present invention has been completed. That is, the present invention provides a medical device with an electrode, wherein at least one of the electrode and the lead wire is made of a non-metal conductive material.

The present invention will be described in detail below. The medical device with an electrode of the present invention has at least an electrode or an electrode,
It must consist of a non-metal conductive material. The non-metal conductive material is not particularly limited, but examples thereof include a conductive polymer such as a conductive inorganic polymer and a conductive organic polymer, conductive carbon black, and carbon fiber. Examples of conductive inorganic polymers include (SN) n and graphite intercalation compounds. Examples of the conductive organic polymer include polyacetylene, poly (p-phenylene), polypyrrole, polythienylene, poly (p-phenylene oxide), poly (p-phenylene sulfide), poly (4,4′-biphenylene), polyaniline, poly (1,
6-heptadiyne), polyacenaphthalene, poly (4-
Vinylpyridine) -iodine complex, polyvinylpyridinium-tetracyanoquinodimethane complex and the like.
Among these non-metal conductive materials, conductive carbon black and carbon fiber are particularly preferable. These non-metal conductive materials can be used alone or in combination of two or more.

Note that these non-metal conductive materials may be used as a mixture of non-metal materials. As non-metallic materials,
For example, thermoplastic resin, rubber and the like, specifically, for example, polyethylene, polypropylene, polyvinyl chloride, polyurethane, polyfluoroethylene such as Teflon, polyester, polyamide such as nylon, polycarbonate, ethylene-vinyl acetate copolymer, Examples thereof include ethylene-acrylic acid copolymers, block copolymers of polydimethylsiloxane and polyurethane, silicone rubber, and modified polymers thereof, with silicone rubber being preferred. These non-metal materials may be used alone or in combination of two or more.

When the non-metal conductive material is used in combination, the content ratio of the non-metal conductive material is not particularly limited and may be appropriately selected and determined according to the required characteristics. For example, when the non-metal material is silicon rubber, the content ratio of the non-metal conductive material is 5 to 80% by weight.
Is preferred. The medical device with an electrode of the present invention requires that at least the electrode of the electrode or the conductive wire is made of a non-metal conductive material, but it is not necessary that all of these are made of a non-metal conductive material. It is preferable that all of these are made of a non-metal conductive material. Further, in the medical device with an electrode of the present invention, it is preferable that parts other than the electrode or the lead wire are inserted in the body by a non-metallic material.
The above-mentioned materials can be used as the non-metal material.

The shape of the electrode or the conductive wire is not particularly limited and may be appropriately selected depending on the required performance. In addition, the electrode or the lead wire may be attached to the surface of the medical device with an electrode or may be embedded inside. The electrodes or conductive wires can be attached by various methods such as adhesion, embedding, and application to the base of the medical device, but it is efficient to attach the non-metal conductive material to the base of the medical device, especially by printing. Therefore, it is preferable. In this case, the non-metal conductive material needs to have fluidity so that it can be printed at the time of printing, and therefore the above-mentioned non-metallic material having fluidity may be mixed. In particular, silicone rubber is used as the non-metallic material having fluidity. preferable. When silicon rubber is used as the fluid non-metal material, the non-metal conductive material is preferably conductive carbon black, and the compounding ratio thereof is preferably 5 to 80% by weight, more preferably 20 to 50% by weight.

Further, when the electrode or the conductive wire is attached to the base of the medical device by applying the non-metal conductive material, in order to improve the adhesion between the non-metal conductive material and the base, the non-metal conductive material is used. It is preferable that the non-metallic material to be blended with and the surface of the electrode of the medical device on which the electrodes or conductors are applied be of the same kind. Further, an adhesive may be blended with the non-metal conductive material. The medical device with an electrode of the present invention may have one electrode, but may have two or more electrodes. When there are two or more electrodes or when complicated wiring is required, it is particularly efficient to attach electrodes or conductive wires by a printing method. The conditions for printing may be appropriately selected depending on the material of the substrate surface of the medical device to which the electrode or the conductive wire is attached and the material of the non-metal conductive material to be printed. In addition, the electrode or the conductive wire printed on the substrate of the medical device with an electrode may be covered with the non-metallic material. The connection of electrodes and conductors
Although various methods can be used, compression co-crosslinking and coating are preferable.

The medical device with an electrode of the present invention is not particularly limited and can be applied to various medical devices with an electrode. For example, a pacing catheter, a pacemaker lead wire, an electrophysiological measuring catheter, an electrocardiographic measuring body. A surface electrode, an abrasion catheter, etc. are mentioned. When the medical device with an electrode of the present invention is a catheter, the cross-sectional shape of the catheter base is not particularly limited, and various shapes such as a circle, an ellipse, a rectangle, a square, a polygon, and an irregular shape, and these shapes It can be perforated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings of the embodiments. The present invention is not limited to these examples. 1 is a perspective view of a tip portion of a pacing catheter which is an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AB in FIG. 1, and FIG. It is sectional drawing when it cut | disconnects by the CD line.

In the figure, a non-metal conductive material composition composed of 70% by weight of silicone rubber and 30% by weight of conductive carbon is provided around the entire circumference of the distal end of the substrate 1 of a catheter having a tube having a hole 2 inside. The electrodes 3 are printed and attached. A lead wire 5 is connected to the electrode 3, and the lead wire 5 is attached to the surface of the substrate 1 of the catheter by being printed with the same nonmetallic conductive material composition as the electrode. The shape of the conducting wire 5 is linear from the distal end of the catheter to the base.

The electrode 4 is attached by being printed with the same nonmetallic conductive material composition as that of the electrode 3 at a position slightly apart from the electrode 3 attached to the tip of the catheter. This electrode 4 has a notch 7 so that it does not come into contact with the conducting wire 5 rather than the entire circumference of the catheter. A conductor wire 6 is connected to the electrode 4, and the conductor wire 6 is attached to the surface of the substrate 1 of the catheter by printing the same nonmetallic conductive material composition as that of the electrode 3. The shape of the conducting wire 6 is linear from the distal end of the catheter to the base.

Although the number of electrodes is two in FIG. 1, three or more electrodes may be attached. The substrate 1 of the catheter is made of silicone rubber, and since the electrodes 3, 4 and the conducting wires 5, 6 contain silicone rubber, the electrodes 3, 4 and the conducting wire 5,
6 is firmly fixed to the base 1 of the catheter.
Further, it is more preferable to coat the portion other than the electrodes with silicone rubber. Instead of silicone rubber, the coating can be performed with other non-metallic material, for example, thermoplastic resin such as polyurethane or cardiosan, or rubber.

In FIG. 1, a pacing catheter using pyrolite carbon as the electrodes 3 and 4 and carbon fibers as the conducting wires 5 and 6 is also preferable.
In this case, the carbon fiber may be impregnated with epoxy resin, silicon rubber, or the like, or may be further coated with silicon rubber or the like. Since this pacing catheter is made of a tube having a hole 2, the internal pressure of the heart can be measured when it is put in the heart.

FIG. 4 is a perspective view of an electrocardiographic skin electrode according to an embodiment of the present invention. In the figure, silicon rubber 70 is provided on the electrode base 9 and the conductor base 8 connected to the electrode base 9.
A non-metallic conductive material composition consisting of wt% and conductive carbon black of 30 wt% is printed and the electrodes 3 and leads 5 are attached. The surface of the electrode substrate 9 other than the electrodes is covered with the adhesive layer 10. The electrode base body 9 and the conductive wire base body 8 are made of silicon rubber. The conductive wire 5 may be covered with a non-metallic material such as thermoplastic resin or rubber as in FIG.

[0017]

In the medical device with an electrode of the present invention, since at least one of the electrode and the lead wire is made of a non-metal conductive material, the medical device with an electrode of the present invention can be used for NMR-CT or the like while being attached to the body. Even when applied to a diagnostic device using magnetism, the image of the diagnostic device is less likely to be disturbed, and a good image can be obtained.

[0018]

[Brief description of drawings]

FIG. 1 is a perspective view of a distal end portion of a pacing catheter showing an embodiment of the present invention.

[0019]

FIG. 2 is an AB of the pacing catheter of FIG.
It is sectional drawing when it cut | disconnects by a line.

[0020]

3 is a CD of the pacing catheter of FIG.
It is sectional drawing when it cut | disconnects by a line.

[0021]

FIG. 4 is a perspective view of a skin electrode for an electrocardiogram showing an embodiment of the present invention.

[0022]

[Explanation of symbols]

1 Base of catheter Two holes 3 electrodes 4 electrodes 5 conductors 6 conductors 7 Notch 8 Conductor base 9 electrode substrate 10 Adhesive layer

Claims (5)

[Claims] 1. A medical device with an electrode, wherein at least the electrode is made of a non-metal conductive material. 2. The medical device with an electrode according to claim 1, wherein the non-metal conductive material is a conductive polymer. 3. The medical device with an electrode according to claim 1, wherein the non-metal conductive material is silicon rubber containing conductive carbon black. 4. The medical device with electrodes according to claim 1, wherein at least the electrodes are attached to the substrate of the medical device by applying a non-metal conductive material. 5. The medical device with electrodes according to claim 1, wherein the medical device is a pacing catheter, a pacemaker lead wire, a catheter for electrophysiology measurement, a body surface electrode for electrocardiography measurement, or an abrasion catheter.