Surgery – Truss – Pad
Patent
1989-02-06
1990-08-14
Cohen, Lee S.
Surgery
Truss
Pad
A61B 4408
Patent
active
049478460
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electrode device for a living body to be used for electrocardiographs, electroencephalographs, etc., and in particular, to be constructed so that electrical signals can be detected easily and correctly even in a warm bath, a cold bath, etc.
PRIOR ART
In recording and analyzing bioelectrical phenomena detected by the Electro-Cardio-Graph (ECG) and utilizing the data in diagnosis, it is essential to make a general judgement according to the bioelectric phenomena under various environmental conditions and to treat a patient more effectively. ECG signals obtained while the patient is taking a cold or warm bath, as one of the environmental conditions, are considered as important analysis material.
Conventional ECG electrode apparatus is shown, for example, in U.S. Pat. No. 4,029,086. A hook type as shown in FIG. 1 or an alligator clip type has been extensively used.
The hook type ECG electrode apparatus will be described with reference to FIG. 1. Adhesive 20 is applied on an adhesion sheet 21 comprising a disk-shaped foam material to stick the sheet 21 to a human body conductive mandrel 23 integral with an electrode 22 is passed through the center hole 24 of the sheet 21. A sponge 25 impregnated with conductive gel is stuck to the electrode 22. A male terminal 26 of the metallic hook is fixed on the mandrel 23. On the other hand, a female terminal 27 comprising an elastic material is formed integral with a synthetic resin connector main body 28. A soldered part 30 of the end part of a lead wire 29 and the female terminal 27 are formed integral with the connector main body 28.
Since the terminals 26, 27 are exposed, a conventional ECG electrode apparatus of the hook or alligator clip type has the disadvantage of electrical signal leakage in water , hence it is not suitable for the detection of electric signals. In addition, since the connector main body 28 must be pressed when connecting the connector and the electrode, the conducting gel in the sponge 25 is squeezed out.
The object of the present invention is to overcome such disadvantages of conventional ECG electrodes.
SUMMARY OF THE INVENTION
The present invention is characterized by a construction wherein a magnet is provided either to the connector or the ECG electrode, and a magnetic material or a magnet to the other, and both are stuck by magnetic attraction. Subsequently, construction wherein a water penetration prevention sealing material comprising closed-cell type foam material is interposed between the electrode case and the connector. Due to this construction, electrical signals do not leak into the water and the connector is not pressed against the electrode.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view of conventional ECG electrode apparatus;
FIG. 2 is a vertical sectional view showing the connector and the electrode in the connected state in an embodiment of the ECG electrode apparatus according to the present invention;
FIG. 3 is a sectional view showing the state before use;
FIG. 4 is a view showing the relationship of the attraction of the magnet and the electrode base to the distance between the connector and the ECG electrode and the relationship of the compression repulsion of the seal material to the distance between the connector and the ECG electrode;
FIG. 5 is an enlarged sectional view showing an example of the sealing material;
FIG. 6 is a sectional view of the ECG electrode according to the present invention;
FIG. 7 is a bottom view of FIG. 6; and FIG. 8 is a sectional view of the ECG electrode apparatus using the ECG electrode of FIG. 6.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be described with reference to FIGS. 2 to 5. FIG. 2 is a vertical sectional view showing the ECG electrode apparatus according to the present invention. FIG. 3 is a sectional view of the apparatus in the condition before use. In FIGS. 2 and 3, A is an ECG electrode, and B is a connector. The ECG electrode A is a conductor in whic
REFERENCES:
patent: 4029086 (1977-06-01), Corasanti
patent: 4112941 (1978-09-01), Larimore
patent: 4259965 (1981-04-01), Fukuda et al.
patent: 4270543 (1981-06-01), Tabuchi et al.
patent: 4653503 (1987-03-01), Heath
Katoh Namio
Kitagawa Toshiyuki
Cohen Lee S.
TDK Corporation
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