ELECTRODE PLACEMENT METHOD AND WEARING DEVICE

1 . An electrode arrangement method for arranging a first-axis positive electrode and a first-axis negative electrode that is an electrode different from the first-axis positive electrode comprising:

arranging the first-axis positive electrode on a body surface of a wearer, and

arranging the first-axis negative electrode on the body surface of the wearer so that a first observation axis, which is a straight line connecting the first-axis positive electrode and the first-axis negative electrode, passes through a cardiac apex part or a ventricle anterior wall of the wearer.

2 . The electrode arrangement method according to claim 1 , further comprising:

arranging a second-axis positive electrode which is an electrode located at one of intersections of a second observation axis of a non-parallel straight line to the first observation axis and passing through the cardiac apex part or the ventricle anterior wall of the wearer and the body surface of the wearer on the body surface of the wearer, and

arranging a second-axis negative electrode which is an electrode located at the other one of the intersections of the second observation axis and the body surface of the wearer on the body surface of the wearer.

3 . The electrode arrangement method according to claim 2 , further comprising:

arranging a third-axis positive electrode on the body surface of the wearer, and

arranging a third-axis negative electrode on the body surface of the wearer, wherein

a third observation axis that is a straight line connecting the third-axis positive electrode and the third-axis negative electrode is a non-parallel straight line to the first observation axis and the second observation axis and is substantially parallel to the electromotive force vector of the heart.

4 . The electrode arrangement method according to claim 3 , wherein

the arrangement of the first observation axis, the second observation axis, and the third observation axis is an arrangement satisfying a condition that a height of orthogonality is higher than a predetermined height in an image space.

5 . The electrode arrangement method according to claim 4 , wherein

the first-axis positive electrode, the second-axis positive electrode, and the third-axis positive electrode are the same electrodes.

6 . The electrode arrangement method according to claim 1 , wherein

one of the electrodes located at the intersection of the first observation axis and the body surface of the wearer is located on the back surface of the wearer, and the other one of the electrodes located at the intersection of the first observation axis and the body surface of the wearer is located on the front surface of the wearer.

7 . The electrode arrangement method according to claim 6 , wherein

the other one electrode is located at a left edge of a fourth intercostal sternum of the wearer.

8 . An attachment tool comprising:

a first-axis positive electrode which is an electrode located on a body surface of a wearer;

a first-axis negative electrode which is an electrode located on the body surface of the wearer and is different from the first axis positive electrode; and

an attachment tool body which fixes the first-axis positive electrode and the first-axis negative electrode to the wearer, wherein

a first-observation axis, which is a straight line connecting the first-axis positive electrode and the first-axis negative electrode, passes through a cardiac apex part or a ventricle anterior wall of the wearer.