JPH10179529A - Electrocardiograph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid forming an obstruction to the motion of a person taking a bath and properly inspect his/her electrocardiogram in such a state as independent of his/her bathing posture under the application of a simple configuration. SOLUTION: This inspection device has a right electrode 7 and a left electrode 8 fitted to a bathtub 6, and an electrocardiograph 4 to perform a process for converting signals from the electrodes 7 and 8 to an electrocardiogram for the indication thereof on a monitor. In this case, the right electrode 7 is fitted so as to cover height from the upper end of the heart of a person taking a bath with his/her upper body kept approximately vertical to the lower end of the heart with his/her upper body kept along the back 61 of the bathtub, regarding an area ranging from the right half of the back of the bathtub 6 to the rear part of the right side 62 thereof. In addition, the left electrode 8 is fitted so as to cover height from the upper end of the heart with the upper body kept approximately vertical to the lower end of the heart with the upper body kept along the back 61 of the bathtub 6, regarding the rear part of the left side 63 of the bathtub 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrocardiogram inspection device for inspecting a bather's electrocardiogram during bathing.

[0002]

2. Description of the Related Art Examining an electrocardiogram of a bather while taking a bath has been found to be very effective for maintaining the daily health of the bather by knowing the degree of burden and physical condition of the bather. In particular, for elderly people whose heat sensation is weakening,
It is also useful to prevent bathing accidents.

[0003] As a general method for examining an electrocardiogram, II.
There is a method called an induction method. In this method, an electrode for electrocardiogram examination is attached to two places (near the right clavicle and the bottom of the left clavicle) sandwiching the heart of the subject, and an earth electrode is attached near the left clavicle, and signals from the two electrodes for electrocardiogram examination are attached. Is processed by an electrocardiograph and displayed on a monitor as an electrocardiogram. However, if an attempt is made to examine a bather's electrocardiogram in this manner, the electrodes and electric wires hinder the bathing operation.

Accordingly, an electrocardiogram of a bather can be inspected during bathing without disturbing the bathing operation, for example, as shown in FIG. 1 of Japanese Patent Application Laid-Open No. 5-95923. An examination apparatus and an electrocardiogram examination apparatus as described in FIG. 4 of the publication have been invented.

[0005] The former electrocardiogram examination apparatus comprises four pairs of electrodes fixed on the right and left sides of a bathtub at intervals in the front-rear direction, and a waveform having the largest amplitude among the waveforms from these electrodes. A main unit capable of extracting and displaying an electrocardiogram of the electrocardiographic waveform.

Further, the latter electrocardiography apparatus comprises a guide rail provided at the upper end of each of a right side wall and a left side wall of a bathtub, a slider slidable along the guide rail, and the slider. An electrode attached to the body, and a main unit capable of capturing waveforms at four points on the guide rail when the electrodes are moved, extracting a waveform having the largest amplitude among them, and displaying an electrocardiogram of the electrocardiographic waveform. have.

[0007] Since these electrocardiogram examination devices extract the waveform having the largest amplitude from the four waveforms and display the electrocardiogram of the electrocardiogram waveform, the electrocardiogram is inspected almost properly regardless of the posture of the bather. be able to.

[0008]

However, in the former device of the former, since a total of eight electrodes are provided, an electric circuit for signal processing becomes complicated, and a bathtub is not provided. There was a problem that installation work was also troublesome.

Further, in the latter conventional apparatus, when the slider is to be automatically moved by a motor or the like,
There is a problem in that the apparatus becomes very large and the cost increases, and if the slider is to be moved manually, much labor is required for the inspection.

[0010] Furthermore, in both of the conventional devices, since the right electrode and the left electrode are provided on the side walls of the bathtub, when the bather sits in the center of the bathtub in the width direction, the heart is placed on the body. Considering that it is located to the left,
The distance between the bather's heart and the right electrode is greater than the distance between the bather's heart and the left electrode. In addition, as the width of the bathtub is larger, the distance between the bather's heart and both electrodes is larger,
There was a problem that it was difficult to obtain an appropriate electrocardiogram.

In view of the above, the present invention is directed to an electrocardiogram inspection apparatus which has a simple structure, and which can inspect an electrocardiogram properly while taking a bath while not taking a hindrance to a bathing operation. The first object is to provide an electrocardiogram that is simple in structure and does not disturb the bathing operation while taking a bath, and that is not affected by the bathing posture of the bather. It is a second object of the present invention to provide an electrocardiogram inspection device that can be used.

[0012]

Means for Solving the Problems In order to achieve the first object, according to the first aspect of the present invention, a right electrode and a left electrode attached to a bathtub, and signals from these electrodes are converted to an electrocardiogram. An electrocardiograph for performing a process for displaying on a monitor, wherein the right electrode is provided so that a bather of the right half of the right side of the backrest of the bathtub has his / her upper body along the backrest of the bathtub. The left electrode was provided over a range including the height from the upper end to the lower end of the heart when the heart was laid, and the left electrode was placed on the back of the left side of the bathtub, and the bather laid his upper body on the backrest surface of the bathtub. In this case, the right electrode is provided over a range including the height from the upper end to the lower end of the heart, and the right electrode is provided on a backrest surface of a bathtub. The left side is provided at the center in the width direction of A right side is provided at a corner portion between the backrest surface and the right side surface of the bath, and the left side of the left electrode is disposed at a position coincident with the corner portion between the bottom surface of the bathtub and the backrest surface in the front-rear direction. And the front side is disposed at a position forward of the rear side by the thickness of the body.

Further, in order to achieve the second object,
In the invention according to claim 3, a right electrode and a left electrode attached to the bathtub, an electrocardiograph for performing processing for displaying a signal from these electrodes as an electrocardiogram and displaying the electrocardiogram on a monitor,
When the bather raises his / her upper body almost vertically, of the part that straddles the right half of the backrest surface of the bathtub and the rear part of the right side of the bathtub, From the upper end of the heart to the lower end of the heart when the bather puts his / her upper body on the back surface of the bathtub, and the left electrode is provided at the rear of the left side surface of the bathtub. Of which, the bath is provided over the range including the height from the upper end of the heart when the upper body is raised almost vertically to the lower end of the heart when the bather places the upper body along the backrest surface of the bathtub. In the invention according to claim 4, the left side of the right electrode is arranged at the center in the width direction of the bathtub backrest surface, and the right side of the right electrode is
It is arranged at a position in front of the corner between the bathtub backrest surface and the bathtub right side by the thickness of the body, and the rear side of the left electrode is in the front and rear direction with the corner between the bathtub bottom surface and the backrest surface. The left electrode is disposed at the same position, and the front side of the left electrode is disposed forward of the rear side by the thickness of the body.

[0014]

In the electrocardiographic examination apparatus according to the first and second aspects, when the bather takes a posture in which the upper body is along the backrest surface of the bathtub, the left electrode is located on the left side of the bather's heart, The right electrode will be located on the side. In other words, the right electrode and the left electrode are always arranged at positions sandwiching the bather's heart, and the distance between the right electrode and the bather's heart is the distance between the left electrode and the bather's heart. In addition, the distance between the bather's heart and the right electrode does not depend on the width of the bathtub.

In the electrocardiographic examination apparatus according to the third and fourth aspects, when the bather takes a posture in which the upper body is raised almost vertically, the left electrode is located on the left side of the bather's heart, and the diagonally right rear side. In addition, the left electrode is located on the right side. In other words, even if the bather takes a posture in which the upper body is raised almost vertically, the right electrode and the left electrode are always arranged at positions sandwiching the bather's heart, and furthermore, the bather The distance between the bather's heart and the right electrode does not change significantly as compared with the posture in which the upper body is placed along the backrest surface of the bathtub.

[0016]

First, an overall configuration of an electrocardiogram inspection apparatus according to a first embodiment will be described. FIG. 1 is a plan view of an electrocardiogram inspection apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a side view of the bathtub, wherein 1 is a bathtub, 2 is a right electrode, 3 is a left electrode,
Is an electrocardiograph and 5 is a ground electrode.

The bathtub 1 has a width W1 = 60 cm, a bottom length L1 = 110 cm, a depth D1 = 57 cm, and a backrest angle θ1 = 85.
°.

The right electrode 2 is formed so as to have a lateral width of 30 cm corresponding to half the width of the bathtub 1 and is provided on the right half of the backrest surface 11 of the bathtub 1.
It is arranged at the center of the backrest surface 11 of the bathtub 1 and the right side is
It is arranged at a corner between the backrest surface 11 of the bathtub 1 and the right side surface 12 of the bathtub 1. Moreover, it is formed so that the top and bottom width may be 29 cm, and the lower side is from the bottom surface 14 of the bathtub 1.
It is arranged so that the height is 27.5 cm and the upper side is at a height of 56.5 cm from the bottom surface 14 of the bathtub 1.

The left electrode 3 is formed so as to have a width of 25 cm, and is provided at the rear of the left side surface 13 of the bathtub 1, with the rear side between the bottom surface 14 of the bathtub 1 and the backrest surface 11. Is arranged at a position that coincides with the corner portion in the front-rear direction. The upper and lower sides are formed so as to have a height of 29 cm, and the lower side is arranged at a height of 27.5 cm from the bottom surface 14 of the bathtub 1 and the upper side is arranged at a height of 56.5 cm from the bottom surface 14 of the bathtub 1. . The width of the left electrode 3 and the position of the front side were set based on the fact that the 97.5th percentile value of the thickness dimension of the adult male body was 25.1 cm.

The positions of the right electrode 2 and the left electrode 3 in the vertical direction and the height direction are determined by the size of the heart of the bather and the posture in which the tallest person leans on the backrest surface 11 of the bathtub 1. The center position was determined based on the center position of the heart when taking a bath and the center position of the heart when the shortest person took a bath with the posture leaning against the backrest surface 11 of the bathtub 1.

Hereinafter, description will be made with reference to FIG. In FIG. 3, a hatched portion h1 indicates the position of the tallest human heart, and a hatched portion h2 indicates the position of the tallest human heart.

First, since the size of the heart is almost the same as that of a human fist, the maximum vertical dimension of the heart is 9 times the hand width of an adult male.
It is an approximate value of 11 cm of the 7.5th percentile value. When the tallest person takes a bath in a posture leaning against the backrest surface 11 of the bathtub 1, the center position of the heart adopts 51cm of 95.0th percentile value for adult boys, and the shortest person takes the backrest surface of the bathtub 1. The center position of the heart when taking a bath in a posture leaning on 11 adopted 33 cm of the 5.0th percentile value for an adult male. That is, when the tallest person leans against the backrest surface 11 of the bathtub 1, the height from the bottom surface 14 of the bathtub 1 to the upper end of the heart is 56.5 cm, and the tallest person is on the backrest surface 11 of the bathtub 1. The height from the bottom surface 14 of the bathtub 1 to the upper end of the heart when leaning is 27.5 cm. Therefore, the right electrode 2 and the left electrode 3 are formed to be 29 cm vertically and vertically, with the lower side being 27.5 cm above the bottom 14 of the bathtub 1 and the upper side being 56.5 cm above the bottom 14 of the bathtub 1. By the arrangement, when the bather is in a posture in which the upper body is along the backrest surface 11 of the bathtub 1, the height from the upper end to the lower end of the bather's heart is the diagonally right rear side of the bather's heart. , The right electrode 2 is always provided, and the left electrode 3 is always provided on the left side of the bather's heart and in the range including the height from the upper end to the lower end of the bather's heart. Will be.

The electrocardiograph 4 is connected to the right electrode 2 and the left electrode 3 by electric wires a and b, receives signals from the right electrode 2 and the left electrode 3, processes the signals, The screen is displayed on a monitor in the form of an electrocardiogram.

The ground electrode 5 is attached to the center of the foot side surface 15 facing the backrest surface 11 of the bathtub 1 and is connected to the electrocardiograph 4 by an electric wire c.

FIG. 4 shows an electrocardiogram of a test result obtained by using a bedside monitor BSM-7211 manufactured by Nihon Kohden Co., Ltd. for the electrocardiograph 4.

Next, Comparative Examples 1 and 2 will be described. (Comparative Example 1) The same bathtub and electrocardiograph as in Embodiment 1 were used, and an electrocardiogram was inspected based on the lead II method described in the background art. As a result, when the bather is taking a bath with his / her upper body along the backrest of the bathtub, FIG.
An electrocardiogram was obtained as shown in FIG.

(Comparative Example 2) The same bathtub and electrocardiograph as in Embodiment 1 were used, and the electrodes were formed on the right and left sides of the bathtub in the same manner as in the technique described in the publication described in the prior art. Four pairs are fixed at intervals in the front-rear direction,
The electrocardiogram was examined. As a result, an electrocardiogram as shown in FIG. 6 was obtained when the bather was taking a bath with the upper body along the backrest surface of the bathtub.

In the method of Comparative Example 1, the electrocardiogram inspection electrode can be attached at an appropriate position according to the bather, so that the electrocardiogram can always be properly inspected. That is, it can be determined that the electrocardiogram obtained in Comparative Example 1 has high effectiveness. Therefore, the electrocardiogram obtained in the first embodiment is
Since it was very similar to the electrocardiogram obtained in Comparative Example 1, it was confirmed that the electrocardiogram had high efficacy. In addition, the electrocardiogram obtained in Comparative Example 2 had high similarity to the electrocardiogram obtained in Comparative Example 1 and was confirmed to have high efficacy.

As described above, Embodiment 1 and Comparative Example 2
Both were confirmed to be highly effective, but Comparative Example 2
Uses a total of eight electrodes and an electrocardiograph,
In the electrocardiogram inspection apparatus according to the first embodiment, the two electrodes 2 and 3
Only the electrocardiograph 4 is used. In other words, the electrocardiogram inspection apparatus according to the first embodiment has a unique effect that the electrocardiogram can be appropriately inspected while taking a bath without disturbing the bathing operation while having a very simple configuration. I have. Further, in the electrocardiogram inspection apparatus according to the first embodiment,
Since the right electrode 2 is provided not on the side surface of the bathtub 1 but on the right half of the backrest surface 11 of the bathtub 1, the distance between the right electrode 2 and the bather's heart is equal to the distance between the left electrode 3 and the bather's heart. It does not become large compared with the heart of the bather and the right electrode 2
Is not affected by the width of the bathtub 1,
More effective than Comparative Example 2.

Next, an electrocardiogram inspection apparatus according to the second embodiment will be described. In the description of the second embodiment, the same reference numerals as those in the first embodiment denote the same components as those in the first embodiment, and a description thereof will be omitted. FIG. 7 is a plan view of an electrocardiogram inspection apparatus according to Embodiment 2 of the present invention, FIG. 8 is a side view of the bathtub, 6 is a bathtub, 7 is a right electrode, and 8 is a left electrode.

The bathtub 6 has a width W2 = 60 cm, a bottom length W2 = 110 cm, a depth W2 = 57 cm, and a backrest angle θ2 = 70.
°.

The right electrode 7 is provided on the back surface 61 of the bathtub 6.
Of the tub 6 and the rear of the right side surface 62 of the bathtub 6. The left side is located in the center of the backrest surface 61 of the bathtub 6, and the right side is the right side 62 of the bathtub 6. The rear portion is located 25 cm forward from a corner between the bottom surface 64 of the bathtub 6 and the backrest surface 61. The upper and lower sides are formed so as to have a height of 28 cm, the lower side is a height of 27 cm from the bottom surface 64 of the bathtub 6, and the upper side is 55 cm from the bottom surface of the bathtub 6.
It is arranged so that it becomes the height of. The position of the front side of the right electrode 7 is 97.5 of the thickness of the body of an adult male.
It was set based on a percentile value of 25.1 cm.

The left electrode 8 is formed so as to have a width of 25 cm and is provided at the rear of the left side surface 63 of the bathtub 6, and the rear side is formed with the bottom surface 64 of the bathtub 6 and the backrest surface 61.
Are arranged at positions corresponding to the corners between the front and rear directions. Also, it is formed so that the top and bottom width is 28 cm,
The lower side is a height of 27 cm from the bottom 64 of the bathtub 6, and the upper side is the bathtub 6
Are arranged so as to have a height of 55 cm from the bottom surface 64. In addition, the width of the left electrode 8 and the position of the front side were determined by the 97.5 percentile value of the thickness of the body of the adult male being 25.1%.
Set based on cm.

The positions of the right electrode 7 and the left electrode 8 in the vertical direction and the height direction are determined by the size of the heart of the bather and the posture in which the shortest person leans against the backrest surface 61 of the bathtub 6. Center position of the heart when bathing in, and
The setting was based on the center position of the heart when the tallest person took a bath with the upper body upright.

Hereinafter, description will be made with reference to FIG. In FIG. 9, the hatched portion h3 indicates the position of the heart when the tallest person takes a bath with the upper body raised vertically, and the hatched portion h4 indicates the backrest surface of the bathtub 6 with the tallest person. The position of the heart when bathing in a posture leaning on 61 is shown.

First, since the size of the heart is almost the same as that of a human fist, the maximum vertical dimension of the heart is nine times the hand width of an adult male.
It is an approximate value of 11 cm of the 7.5th percentile value. The center position of the heart when the shortest person takes a bath with the posture leaning on the backrest surface 61 of the bathtub 6 adopts 33 cm of the 5.0th percentile value for adult boys, and the tallest person holds the upper body vertically. The center position of the heart when taking a bath in the raised posture adopted the 97.5 percentile value of 49 cm for an adult male. In other words, when the tallest person leans against the backrest surface 61 of the bathtub 6, the height from the bottom surface 64 of the bathtub 6 to the upper end of the heart is 54.5 cm, and the tallest person leans against the backrest surface 61 of the bathtub 6. The height from the bottom surface 64 of the bathtub 6 to the upper end of the heart when it is applied is 27.5 cm. Therefore, the right electrode 7
In addition, the left electrode 8 is formed to have a vertical width of 27 cm, the lower side is a height of 27.5 cm from the bottom surface 64 of the bathtub 6, and the upper side is the bottom surface 6 of the bathtub 6.
By arranging it to be 4 to 54.5 cm high,
The right electrode 7 is always provided in a range including the height from the upper end to the lower end of the bather's heart from the diagonally right rear side to the right side of the bather's heart, and is always on the left side of the bather's heart. The left electrode 8 is always provided in a range including the height from the upper end to the lower end of the bather's heart. In other words, even if the bather takes a posture in which the upper body is raised almost vertically, the right electrode 7 and the left electrode 8 are located at positions sandwiching the bather's heart.
Are always arranged, and the bather's heart and the right electrode 7 are compared with when the bather takes a posture in which his / her upper body follows the backrest surface 61 of the bathtub 6. The distance does not change significantly.

FIG. 10 and FIG. 11 show that the electrocardiograph includes a bedside monitor BSM-721 manufactured by Nihon Kohden Corporation.
1 shows an electrocardiogram of a test result employing No. 1. Note that FIG. 10 shows a case where the bather is bathing in a posture in which his / her upper body is along the backrest surface 61 of the bathtub 6 as shown in FIG. 12, and FIG. 11 shows a bather as shown in FIG. Is a case of bathing with the body upright. In each case, it is very similar to the electrocardiogram obtained in Comparative Example 1 shown in Embodiment 1, and thus it was confirmed that the electrocardiogram had high effectiveness.

That is, in the electrocardiogram examination apparatus of the second embodiment, even when the bather takes a posture in which the upper body is raised almost vertically, the bather keeps his / her body along the backrest surface 61 of the bathtub 6. Since the distance between the bather's heart and the right electrode 7 does not change significantly compared to when the bather is taken in a posture, it is possible to properly examine the electrocardiogram without being affected by the bather's bathing posture. The effect that it can be obtained is obtained.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and a design change or the like may be made without departing from the gist of the present invention. Even if present, it is included in the present invention. For example,
In the embodiment, and in the examples, the monitor displays the ECG on the screen. However, the monitor may print and display the ECG. Further, in the embodiment, the example in which the right electrode and the left electrode and the electrocardiograph are connected by an electric wire is shown, but by using a transmitter, the electrocardiograph wirelessly transmits a signal from the right electrode and the left electrode. You may enable it to receive.

[0040]

As described above, in the electrocardiogram examination apparatus according to claims 1 and 2, when the bather takes a posture in which the upper body is along the backrest surface of the bathtub, the heart of the bather is taken. Since the signals from the left electrode located on the left side and the right electrode located diagonally behind the right side can be displayed on the monitor as an electrocardiogram, it is a simple configuration using the left electrode, right electrode and electrocardiograph. However, it is possible to obtain an effect that the electrocardiogram can be properly inspected while the bathing operation is not hindered during the bathing.

Further, in the electrocardiogram examination apparatus according to the third and fourth aspects, even when the bather takes a posture in which the upper body is raised almost vertically, the bather follows the upper body on the backrest surface of the bathtub. Since the distance between the bather's heart and the right electrode does not change significantly compared to when the bather takes the posture, the ECG can be inspected properly without being affected by the bathing posture of the bather. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a bathtub in which an electrocardiogram inspection apparatus according to Embodiment 1 is installed.

FIG. 2 is a side view of a bathtub in which the electrocardiogram inspection apparatus according to the first embodiment is installed.

FIG. 3 is an explanatory diagram of the electrocardiogram inspection apparatus according to the first embodiment.

FIG. 4 is an electrocardiogram obtained in the first embodiment.

FIG. 5 is an electrocardiogram obtained in Comparative Example 1.

FIG. 6 is an electrocardiogram obtained in Comparative Example 2.

FIG. 7 is a plan view of a bathtub in which the electrocardiogram inspection device according to the second embodiment is installed.

FIG. 8 is a side view of a bathtub in which the electrocardiogram inspection device according to the second embodiment is installed.

FIG. 9 is an explanatory diagram of an electrocardiogram inspection apparatus according to the second embodiment.

FIG. 10 is an electrocardiogram obtained in the second embodiment.

FIG. 11 is an electrocardiogram obtained in the second embodiment.

FIG. 12 is a view showing a bathing posture.

FIG. 13 is a view showing a bathing posture.

[Explanation of symbols]

 1,6 Bathtub 11,61 Backrest surface 12,62 Right side surface 13,63 Left side surface 14,64 Bottom surface 2,7 Right electrode 3,8 Left electrode 4 Electrocardiograph 5 Ground electrode

Claims (4)

[Claims] 1. An electrocardiogram inspection apparatus comprising: a right electrode and a left electrode attached to a bathtub; and an electrocardiograph for performing a process for converting a signal from these electrodes into an electrocardiogram and displaying the electrocardiogram on a monitor. The right electrode is provided over a range including the height from the upper end to the lower end of the heart when the bather puts his / her upper body on the backrest surface of the bathtub, in the right half of the backrest surface of the bathtub, The left electrode is provided over the range including the height from the upper end to the lower end of the heart when the bather puts his / her upper body on the back surface of the bathtub in the rear portion of the left side surface of the bathtub. Characteristic ECG inspection device. 2. The right electrode, a left side surface is provided at the center in the width direction of the backrest surface of the bathtub, a right side is provided at a corner between the backrest surface and the right side surface of the bathtub, The rear side is arranged at a position coinciding in the front-rear direction with the corner between the bottom surface of the bathtub and the backrest surface, and the front side is arranged at a position in front of the rear side by the thickness dimension of the body than the rear side. The electrocardiogram inspection apparatus according to claim 1. 3. A bathtub for electrocardiogram examination, comprising: a right electrode and a left electrode attached to a bathtub; and an electrocardiograph for processing a signal from these electrodes into an electrocardiogram and displaying the electrocardiogram on a monitor. The right electrode, of the part straddling the right half of the backrest surface of the bathtub and the rear part of the right side of the bathtub, from the upper end of the heart when the bather raised the upper body almost vertically, The left electrode is provided over a range including the height to the lower end of the heart when the upper body is placed along the backrest surface of the bathtub. An electrocardiogram, which is provided over a range including a height from an upper end of the heart when raised vertically to a lower end of the heart when a bather puts his / her upper body on a backrest surface of the bathtub. Inspection equipment. 4. The left side of the right electrode is disposed at the center in the width direction of the backrest surface of the bathtub, and the right side of the right electrode is thicker than the corner between the backside surface of the bathtub and the right side surface of the bathtub. The rear side of the left electrode is disposed at a position corresponding to the corner between the bathtub bottom surface and the backrest surface in the front-rear direction by the dimension, and the front side of the left electrode is the rear side. 4. The electrocardiogram inspection apparatus according to claim 3, wherein the electrocardiogram inspection apparatus is arranged at a position forward of the side by the thickness of the body.