Muscle electrical stimulation device

Abstract

The invention provides a muscle electrical stimulation device which has an effect of promoting the movement of muscles of a user and is easy to stabilize the posture during swinging. An upper surface (11) of a muscle electrical stimulation device (1) is provided with a foot rest (2) on which both feet of a user are placed, and at least one pair of electrodes (3) disposed on the foot rest (2). The muscle electrical stimulation device (1) is provided with a control unit which is configured so as to be able to supply power to the electrodes (3). The lower surface (12) of the muscle electrical stimulation device (1) is provided with a ground contact part (5) which protrudes downward than the front end (121) and the rear end (122) of the lower surface (12). When the muscle electrical stimulation device (1) is swung in the front-back direction in a state in which the ground contact section (5) is in contact with the ground surface, the ratio L / alpha of the amount of displacement (L) of the contact position between the ground contact section (5) and the ground surface on the ground surface to the amount of change (alpha) of the angle of the muscle electrical stimulation device (1) is within the range of 1 mm / DEG to 5 mm / DEG.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a muscle electric stimulation device. BACKGROUND

[0002] A muscle electric stimulation device has an electrode that contacts a user's body. The muscle electric stimulation device flows a weak electric current to the user's body via the electrode. Thereby, the muscle electric stimulation device is configured to be able to apply electric stimulation to the user's muscle.

[0003] For example, by providing an electrode to a foot exerciser described in Japanese Patent Application Publication No. 2002-224191, it is expected to promote movement of the user's leg, movement of the foot, or movement of the ankle. Here, the foot exerciser has a top plate on which the user places the foot and a bottom plate that is provided to the ground or the like. Moreover, the foot exerciser is configured to be able to swing in the front-back direction.

[0004] The bottom plate of the foot exerciser of Japanese Patent Application Publication No. 2002-224191 has a flat link plate and a curved plate for swinging the foot exerciser. The foot exerciser link plate is configured to contact the ground when the user does not apply a load to the top plate. Therefore, when the user uses the foot exerciser to move the foot, the user needs to press the top plate with the toes or the heel, raise the link plate from the ground, and adjust the load to swing the foot exerciser.

[0005] However, when a muscle electric stimulation device is used to apply electric stimulation to the user's muscle, the muscle contracts at a timing different from the user's own intention. Therefore, when the muscle electric stimulation device that swings in the front-back direction is used, the muscle electric stimulation device sometimes swings at a timing that the user does not expect, with the contraction of the muscle caused by the electric stimulation. Therefore, the user sometimes feels that such a muscle electric stimulation device is difficult to operate. In addition, particularly, for a user who is not accustomed to electric stimulation or a user whose muscle strength is relatively low, such as a user who has a reason that cannot easily adjust the posture of the muscle electric stimulation device, it is sometimes felt that it is difficult to maintain the link plate in a state of being raised from the ground. For such a user, it is also felt that it is difficult to adjust the load to swing the muscle electric stimulation device front-back after raising the link plate from the ground. SUMMARY

[0006] The muscle electric stimulation device related to the embodiments of the present disclosure is completed in view of the background. That is, the object of the present disclosure is to provide a muscle electric stimulation device that is easy to operate for a user and is able to promote movement of the user's leg muscle.

[0007] The muscle electric stimulation device according to the embodiment of the present disclosure is configured to apply electric stimulation to a user's muscle, and includes a foot rest portion provided on an upper surface of the muscle electric stimulation device to place the user's feet, at least one pair of electrodes provided to the foot rest portion, a control portion configured to supply electric power to the electrodes, and a ground portion bulging downward from a front end and a rear end of a lower surface of the muscle electric stimulation device, the muscle electric stimulation device being configured to swing in a front-rear direction in a state where the ground portion is in contact with the ground, the muscle electric stimulation device being configured to rest on the ground with the ground portion and to adopt a reference posture when the foot rest portion does not place the user's feet, in the reference posture, both the front end and the rear end of the muscle electric stimulation device being separated from the ground.

[0008] The muscle electric stimulation (hereinafter, abbreviated as "EMS") device has a ground portion bulging downward from a front end and a rear end of a lower surface of the muscle electric stimulation device. In addition, the EMS device is configured to adopt a reference posture when the ground portion rests on the ground and the foot rest portion does not place the user's feet. In the reference posture, both the front end and the rear end of the EMS device are separated from the ground. Therefore, when the user uses the EMS device, it is not necessary to load the foot rest portion with the toes or the heels, and it is possible to separate the front end and the rear end of the EMS device from the ground. In addition, the user can easily swing the EMS device in either of the front and rear directions from the posture. Therefore, even in the case of applying electric stimulation to the muscle, the user can easily swing the EMS device.

[0009] Therefore, according to the above embodiment, it is possible to provide an EMS device that is easy to operate for a user and that can promote the movement of the user's leg muscles. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a perspective view of the EMS device according to the first embodiment.

[0011] Figure 2 is a plan view of the EMS device according to the first embodiment.

[0012] Figure 3 is a rear view of the EMS device according to the first embodiment.

[0013] Figure 4 is a left side view of the EMS device according to the first embodiment.

[0014] Figure 5 is a right side view of the EMS device according to the first embodiment.

[0015] Figure 6This is a bottom view of the EMS device according to the first embodiment.

[0016] Figure 7 This is an explanatory diagram illustrating a method for measuring the displacement of the contact position when the EMS device according to the first embodiment swings.

[0017] Figure 8 This is a perspective view showing an example of the storage status of the EMS device according to the first embodiment.

[0018] Figure 9 This is a block diagram of the control unit of the EMS device according to the first embodiment.

[0019] Figure 10 This is a flowchart illustrating an example of the operation of the EMS device according to the first embodiment.

[0020] Figure 11 This is a rear view of an EMS device with a hemispherical bulge grounding portion according to the second embodiment.

[0021] Figure 12 This is a rear view of an EMS device with two hemispherical grounding portions according to the second embodiment.

[0022] Figure 13 This is a rear view of an EMS device with two semi-cylindrical bulges as described in the second embodiment.

[0023] Figure 14 This is a side view of the EMS device in Comparative Example 1. Detailed Implementation

[0024] The aforementioned EMS device is used, for example, with its grounding part in contact with the ground and the user's feet resting on a footrest while seated in a chair or sofa. In this specification, for convenience, the up / down, front / back, and left / right positions of the EMS device are shown based on its posture when used in the above manner.

[0025] That is, the arrangement direction of the footrest and grounding part in the EMS device is called the height direction of the EMS device. The direction from the grounding part towards the footrest in the height direction is called "up." The direction from the footrest towards the grounding part in the height direction is called "down." Furthermore, the arrangement direction of the portion of the foot resting on the footrest and the portion resting on the heel when the user places their foot on the footrest is called the front-back direction. The direction from the heel towards the toe in the front-back direction is called "forward." The direction from the toe towards the heel in the front-back direction is called "backward." Moreover, the direction orthogonal to both the front-back and height directions is called the lateral direction. The side of the left foot resting in the lateral direction is called the left side. The side of the right foot resting in the lateral direction is called the right side.

[0026] Furthermore, the method of using the EMS device is not limited to the methods described above. The EMS device may also be configured to be used in ways other than those described above. In this case, the EMS device may be used in a posture that is inconsistent with the above-described up-down, front-back, or left-right directions and the actual up-down direction during use.

[0027] The EMS device assumes a reference posture with the grounding part placed on the ground and the user's feet not resting on the footrest. In this reference posture, both the front and rear ends of the EMS device are separated from the ground. That is, the EMS device is configured such that only the grounding part is in contact with the ground when the grounding part is placed on the ground. Therefore, it is not necessary for the user to continuously apply load to the footrest using their toes or heels to separate the front and rear ends of the EMS device from the ground. Therefore, even users with relatively low muscle strength can easily use the EMS device. In addition, the EMS device configured in this way can easily swing in the back-and-forth direction during EMS. Therefore, even users who are not accustomed to electrical stimulation of muscles can easily use the EMS device.

[0028] The aforementioned EMS device preferably has its center of gravity above the contact portion between the grounding part and the ground in the aforementioned reference posture. In this case, after the EMS device is swung back and forth from the reference posture, the posture of the EMS device easily returns to the reference posture. Therefore, the posture of the EMS device is more easily stabilized when swung back and forth. As a result, the operability of the EMS device can be further improved.

[0029] The upper surface of the EMS device has a footrest for supporting the user's foot. Additionally, at least one pair of electrodes is provided in the footrest for applying electrical stimulation to the user's muscles. This embodiment includes various implementations with different numbers, arrangements, and shapes of electrodes provided in the footrest. For example, the EMS device may have a pair of electrodes consisting of a first electrode and a second electrode. Here, the first electrode is positioned in contact with one of the user's feet. The second electrode is positioned in contact with the other foot. In this case, the first and second electrodes may each have a shape that contacts the entire foot of the user, or a shape that contacts only a portion of the foot. Furthermore, the EMS device may have two or more pairs of electrodes. In this case, for example, multiple first electrodes can be provided in the footrest at the position contacting one of the user's feet. Simultaneously, multiple second electrodes can be provided in the footrest at the position contacting the other foot of the user.

[0030] The EMS device can also have a raised portion surrounding the foot rest, which protrudes upwards from the electrodes. In this case, even if the EMS device is positioned with the electrodes facing downwards for some reason, it is possible to prevent both the first and second electrodes from contacting the ground. Therefore, in this case, accidental power-on when the EMS device is not in use can be easily prevented.

[0031] There are no particular limitations on the shape and placement of the raised portion in the EMS device. The shape and placement of the raised portion can be varied. For example, the raised portion can be positioned outside the footrest when the user's foot is placed on it. In this case, when the user places their foot on the footrest of the EMS device, the raised portion acts as a guide, allowing the user to easily determine the position of their foot on the footrest. Furthermore, the raised portion easily restricts the displacement of the user's foot. Therefore, the user's foot is less likely to shift during EMS device use. As a result, the ease of use of the EMS device can be further improved.

[0032] Alternatively, the raised portion located on the outside of the user's foot can also have a recessed portion on its inner side in the lateral direction that is more concave than the surrounding area. In this case, when the user is carrying the EMS device, they can easily carry the EMS device by placing their fingers in the recessed portion of the raised portion.

[0033] Alternatively, the raised portion can be positioned between the user's feet when the user places their feet on the footrest. In this case, when the user places their feet on the footrest of the EMS device, the user also uses the raised portion as a guide to easily determine the position of their feet on the footrest. As a result, the ease of use of the EMS device can be further improved.

[0034] Alternatively, for example, the EMS device may have a first raised portion and a second raised portion as raised portions. In this case, the first raised portion is positioned on the outside of the user's foot when the user's foot is placed on the footrest. The second raised portion is positioned between the user's feet when the user's foot is placed on the footrest. Preferably, the first and second raised portions are separate from each other. In this case, when the user places their foot on the footrest of the EMS device, the user can easily determine the position of their foot on the footrest using the raised portions as guides. Furthermore, the raised portions easily restrict the displacement of the user's foot. Therefore, the position of the user's foot is less likely to shift during the use of the EMS device.

[0035] Furthermore, by providing the aforementioned first and second raised portions in the EMS device, for example, when a user, already seated, places their calves on the raised portions for EMS, the user can easily determine the position of their calves on the footrest using the first and second raised portions as guides. Additionally, the raised portions easily restrict the displacement of the user's calves. Therefore, during use of the EMS device, the position of the user's calves is less likely to shift. As a result, the ease of use of the EMS device can be further improved.

[0036] When the EMS device has the aforementioned first raised portion and second raised portion, it is preferable that the distance between the front end of the first raised portion and the front end of the second raised portion is wider than the distance between the rear end of the first raised portion and the rear end of the second raised portion. In this case, the first raised portion and the second raised portion can be arranged according to the shape of the user's foot. Therefore, the aforementioned effect can be obtained more reliably. From the same viewpoint, it is preferable that the distance between the first raised portion and the second raised portion is wider as it approaches the front.

[0037] The grounding portion of the EMS device has a shape that bulges downwards from the front and rear ends of the lower surface of the EMS device. The grounding portion only needs to be configured to allow the EMS device to swing at least in the front-back direction. That is, the grounding portion can be configured to allow the EMS device to swing only in the front-back direction. Alternatively, the grounding portion can also be configured to allow the EMS device to swing in multiple directions, including the front-back direction.

[0038] More specifically, the grounding portion of the EMS device only needs to have a shape in which at least a portion of its outline is arc-shaped when the EMS device is viewed from the side. For example, the grounding portion can have a shape that bulges out in a hemispherical shape on the lower surface of the EMS device. In this case, a single bulge can be provided in the EMS device. Thus, an EMS device capable of swinging in multiple directions, including the front-back direction, can be obtained. Alternatively, for example, multiple bulges arranged laterally with spacing between them can also be provided. Thus, an EMS device capable of swinging only in the front-back direction can be obtained.

[0039] Alternatively, the grounding portion may also have a shape that is partially or entirely bulging out in a semi-cylindrical shape along the lower surface of the EMS device. In this case, an EMS device that can only swing in the back-and-forth direction can be obtained.

[0040] When the grounding part of the EMS device is placed on the ground, the EMS device adopts a specific reference posture such that the height from the ground to the front end of the lower surface of the EMS device is equal to the height from the ground to the rear end of the lower surface of the EMS device. In this case, the height from the ground to the front end of the lower surface of the EMS device is preferably 50 mm or less. In this configuration, when the user places their foot on the footrest, the burden on the ankle can be further reduced. From the same perspective, the height from the ground to the front end of the lower surface of the EMS device in the aforementioned specific reference posture is preferably 40 mm or less, more preferably 35 mm or less.

[0041] Furthermore, in the aforementioned specific reference posture, the height from the ground to the front end of the lower surface of the EMS device is preferably 10 mm or more, more preferably 25 mm or more. In this case, the user can appropriately swing the EMS device in the back-and-forth direction. Therefore, the effect of promoting movement can be further improved.

[0042] When the height from the ground to the front end of the lower surface of the EMS device is set to a desired range, the upper and lower limits of the aforementioned height can be appropriately combined. For example, the height from the ground to the front end of the lower surface of the EMS device in the aforementioned specific reference posture can be less than 50 mm, more than 10 mm but less than 40 mm, or more than 25 mm but less than 35 mm.

[0043] When the grounding part is in contact with the ground, the ratio L / α of the displacement L of the contact position between the grounding part and the ground relative to the change in angle α of the EMS device when it swings in the back-and-forth direction is 1 mm / ° or more and 5 mm / ° or less. The grounding part preferably has a shape within this range. When the ratio L / α in the EMS device is 1 mm / ° or more, the change in posture of the EMS device when it swings in the back-and-forth direction becomes smoother. As a result, even when electrical stimulation is applied to the user's muscles, it is easier to stabilize the posture of the EMS device. From the viewpoint that the posture of the EMS device is easier to stabilize, the value of the ratio L / α is preferably 1.2 mm / ° or more, more preferably 1.4 mm / ° or more, and even more preferably 1.6 mm / ° or more.

[0044] Furthermore, when the aforementioned ratio in the EMS device is 5 mm / ° or less, the user can appropriately flex and extend their ankles and other muscles when the EMS device swings in the back-and-forth direction, further promoting muscle movement. From the viewpoint of further improving the effect of promoting muscle movement in the user, the value of the aforementioned ratio L / α is preferably 4.5 mm / ° or less, more preferably 4.0 mm / ° or less, and even more preferably 3.5 mm / ° or less.

[0045] When setting the L / α value in the aforementioned EMS device to a desired range, the upper and lower limits of the L / α value can be appropriately combined. For example, the range of the L / α value can be 1.2 mm / ° to 4.5 mm / ° or 1.4 mm / ° to 4.0 mm / ° or 1.6 mm / ° to 3.5 mm / °.

[0046] The calculation method for the ratio L / α is as follows. First, bring the grounding part of the EMS device into contact with the ground, stabilizing the EMS device in a suitable posture. Record the contact position of the grounding part with the ground and the posture of the EMS device at this time. Then, while maintaining the contact state between the grounding part and the ground, swing the EMS device forward or backward to prevent the grounding part from sliding on the ground. Then, record the contact position of the grounding part with the ground and the posture of the EMS device after the swing.

[0047] The distance from the point of contact between the grounding part and the ground before the swing to the point of contact between the grounding part and the ground after the swing is defined as the displacement L (unit: mm). Furthermore, the change in the angle of the EMS device's posture after the swing, based on the posture of the EMS device before the swing, is defined as the change in angle α (unit: °). Moreover, the change in angle of the EMS device before and after the swing can be measured at any part of the EMS device. For example, the change in angle α before and after the swing can be measured based on the position of the footrest, the first electrode, or the second electrode in the EMS device. Additionally, the change in angle α before and after the swing can also be measured based on an imaginary straight line connecting the front and lower ends of the upper surface of the EMS device, or an imaginary straight line connecting the front and lower ends of the lower surface.

[0048] Furthermore, when viewed from the side, at least a portion of the outline of the grounding portion is arc-shaped. The radius of curvature of this arc-shaped portion is preferably 58 mm to 285 mm, more preferably 75 mm to 200 mm, and even more preferably 100 mm to 160 mm. In this case, with the arc-shaped portion in contact with the ground, the EMS device can swing in the back-and-forth direction. This avoids abrupt changes in the posture of the EMS device. Additionally, it more reliably promotes muscle movement in the user.

[0049] The EMS device may also have a support portion at its lateral end. The support portion may also have a support surface perpendicular to the lateral direction of the EMS device. In this case, when storing the EMS device, it can be placed upright with the support surface in contact with the ground. This reduces the area occupied by the EMS device during storage, further improving its ease of use. Furthermore, by placing the EMS device upright with the support surface in contact with the ground, dirt or dust is less likely to adhere to the surfaces of the first and second electrodes.

[0050] The EMS device can also include a heater. The heater is configured to heat the footrest. In this case, the user's body, which is placed on the footrest, is heated. This allows the user to relax their muscles. Therefore, it is expected that the exercise effect can be further improved. Furthermore, heating the user's body on the footrest promotes sweating. Moreover, by promoting sweating, the resistance between the first and second electrodes placed on the footrest and the user's body can be further reduced. As a result, it is easier to apply electrical stimulation to the user's muscles.

[0051] There are no particular limitations on the configuration and structure of the heaters in an EMS device. The heaters can be configured and structured in various ways. For example, the heater can be installed on the back of the footrest inside the EMS device. Alternatively, the heater can be embedded in the footrest or electrodes. Furthermore, the footrest or electrodes can be constructed from heating elements. This allows these parts to heat up themselves.

[0052] The control unit of the EMS device is configured to apply electrical stimulation to the user's muscles by supplying power to the electrodes. The method of electrical stimulation applied by the control unit is not particularly limited and can take various forms. For example, the control unit may be configured to switch the supply and stop of power to the electrodes. This allows for the application of pulsed electrical stimulation to the user's muscles. Alternatively, the control unit may be configured to periodically change the potential of the electrodes. This allows for the application of periodic electrical stimulation to the user's muscles.

[0053] The control unit can also be configured to control the overall operation of the EMS device, in addition to switching the power supply to the electrodes. For example, the control unit can also be configured to communicate with a wearable terminal. The wearable terminal is configured to acquire vital sign data such as the user's body temperature or perspiration. That is, the control unit can also be configured to control the power supply to the electrodes based on the data acquired by the wearable terminal. Furthermore, the control unit can also be configured to acquire information related to the usage status of the EMS device, including the number of times or the duration of EMS treatments performed by the user. Simultaneously, the control unit can also be configured to send this information related to the usage status of the EMS device to a server. The operation of the control unit can be implemented, for example, through electronic circuits or programs stored in a microcomputer.

[0054] EMS devices may also have a power supply unit to provide the power required for their operation. The specific form of the power supply unit is not particularly limited. For example, the power supply unit can be a primary battery, a secondary battery, or a storage device such as a capacitor.

[0055] When an EMS device has a power storage device as its power source, the EMS device preferably has a power terminal for charging the power storage device at its lateral end. The lateral end of the EMS device is a part where the user is unlikely to apply load during EMS operation. Therefore, by providing a power terminal at the lateral end of the EMS device, it is easy to avoid applying unnecessary load to the power terminal during EMS operation.

[0056] Furthermore, the EMS device preferably has support portions at both ends in the lateral direction. Here, a power terminal is provided on the support surface of at least one of these support portions. In this case, when the EMS device is erected with the support surface without the power terminal in contact with the ground, the energy storage device can be charged through the power terminal provided on the other support surface. This further improves the ease of use of the EMS device.

[0057] Furthermore, in this case, for example, the EMS device can be placed upright on a stand equipped with contacts for connecting to power terminals. This allows the energy storage device to be charged while the EMS device is upright. Consequently, the area occupied by the EMS device during charging is reduced. As a result, the ease of use of the EMS device can be further improved.

[0058] (First Implementation)

[0059] Reference Figures 1-10 The EMS device according to this embodiment will be described. The EMS device 1 is configured to apply electrical stimulation to the user's muscles. For example... Figures 1-3As shown, the upper surface 11 of the EMS device 1 is provided with footrests 2 (2L, 2R) for supporting the user's feet and at least one pair of electrodes 3 (3L, 3R). At least one pair of electrodes 3 (3L, 3R) are provided in the footrests 2. Additionally, as... Figure 9 As shown, the EMS device 1 includes a control unit 4. The control unit 4 is configured to supply power to the electrodes 3. Additionally, as... Figure 1 and Figures 3-6 As shown, a grounding portion 5 is provided on the lower surface 12 of the EMS device 1, which bulges downwards from the front end 121 and the rear end 122 of the lower surface 12. For example... Figure 7 As shown, the EMS device 1 is configured to swing in the back-and-forth direction while the grounding part 5 is in contact with the ground. Furthermore, the EMS device 1 is configured to assume a reference posture when the grounding part 5 is placed on the ground F and the user's foot is not placed on the footrest 2. In this reference posture, both the front end 121 and the rear end 122 of the lower surface 12 of the EMS device 1 are separated from the ground F.

[0060] like Figure 2 As shown, the upper surface 11 of the EMS device 1 has a rectangular shape. The upper surface 11 of the EMS device 1 is provided with foot rests 2 (2L, 2R), a first electrode 3L and a second electrode 3R serving as electrodes 3, a raised portion 6, an operation panel 13 for operating the EMS device 1, and a display panel 14 for displaying the operating status of the EMS device 1.

[0061] The footrest 2 is located at the center of the upper surface 11 of the EMS device 1. The EMS device 1 has two footrests 2: a first footrest 2L corresponding to the user's left foot and a second footrest 2R corresponding to the user's right foot. The central portion 21 of each footrest 2 in the front-back direction protrudes upwards from the portion 22 corresponding to the toes and the portion 23 corresponding to the heels. Furthermore, the footrest 2 has a gently curved surface shape. Additionally, as... Figure 2 and Figure 3 As shown, a bulge 24 protruding upwards is provided on the inner side of the center portion of the footrest 2, which corresponds to the arch of the user's foot in the front-back direction. Thus, the footrest 2 in the EMS device 1 has a shape that corresponds to the arch shape of the user's foot. Therefore, the user can place their foot on the footrest 2 while maintaining the arch shape of their foot.

[0062] In addition, such as Figure 2 As shown, a first electrode 3L is provided in the first footrest 2L for supporting the left foot, and a second electrode 3R is provided in the second footrest 2R for supporting the right foot. More specifically, the first electrode 3L and the second electrode 3R are provided in the portion of each footrest 2 other than the protruding portion 24. Figure 4As shown, the first electrode 3L and the second electrode 3R are electrically connected to the control unit 4 disposed within the EMS device 1. Thus, the EMS device 1 is configured to apply electrical stimulation to the user's muscles using power supplied from the control unit 4.

[0063] like Figure 1 As shown, a raised portion 6, which protrudes upwards from the first electrode 3L and the second electrode 3R, is provided around each foot 2. Figures 1-3 As shown, the EMS device 1 has a first raised portion 61 and a second raised portion 62 as raised portions 6. The first raised portion 61 is positioned on the outside of the user's foot when the user's foot is placed on the footrest 2, that is, it is located on the outside of each footrest 2 in the lateral direction. Figure 4 and Figure 5 As shown, when the EMS device 1 is in a specific reference posture, the first bulge 61 is highest at its central portion in the front-rear direction. Moreover, the greater the distance in the front-rear direction from this central portion, the lower the height of the first bulge 61. Thus, when the EMS device 1 is in a specific reference posture, the first bulge 61 has a mountain-shaped form.

[0064] like Figure 2 As shown, in the two first raised portions 61 (61L, 61R), the right first raised portion 61R has a recess 611 that is recessed from the surrounding area on its inner side in the lateral direction, that is, the part opposite to the user's foot.

[0065] In addition, such as Figure 2 and Figure 3 As shown, the first raised portion 61 is provided from the outside of the foot rest portion 2 to both ends of the EMS device 1 in the lateral direction, and is connected to the bracket portion 7 described later.

[0066] like Figure 2 As shown, the second bulge 62 is positioned between the user's feet when the user's feet are resting on the footrest 2, specifically between the first footrest 2L and the second footrest 2R. Like the first bulge 61, the second bulge 62 is highest at its center in the front-rear direction when the EMS device 1 is in a specific reference posture. Furthermore, the greater the distance from this center in the front-rear direction, the lower the height of the second bulge 62. Thus, when the EMS device 1 is in a specific reference posture, the second bulge 62 has a mountain-shaped form. Additionally, the first bulge 61 and the second bulge 62 are separated from each other in the lateral direction.

[0067] Furthermore, in the EMS device 1, the distance between the front end of the first raised portion 61 and the front end of the second raised portion 62 is wider than the distance between the rear end of the first raised portion 61 and the rear end of the second raised portion 62.

[0068] likeFigure 2 As shown, an operation panel 13 for operating the EMS device 1 is provided at the center of the second raised portion 62. The specific structure of the operation panel 13 is not particularly limited. For example, the operation panel 13 in the EMS device 1 has three operation switches arranged relative to each other in the front-to-back direction. Figure 9 As shown, these operation switches are electrically connected to the control unit 4 within the EMS device 1. The user can generate operation signals for operating the EMS device 1 by operating the operation switches. The operation signals generated by the operation switches are input to the control unit 4. Thus, the user can control the operation of the EMS device 1 via the operation panel 13. The operation signals generated by the operation switches include, for example, signals indicating the start of electrical stimulation, signals indicating the stop of electrical stimulation, signals indicating changes in the intensity of electrical stimulation, and signals indicating changes in the motion control program. The control unit can also be configured to generate these operation signals using a single operation switch. Alternatively, a separate operation switch can be provided for each type of operation signal.

[0069] In addition, such as Figure 2 As shown, a display panel 14 for displaying the operating status of the EMS device 1 is provided in front of the operation panel 13 in the second raised portion 62. Figure 9 As shown, the display panel 14 is electrically connected to the control unit 4 within the EMS device 1. Thus, the display panel 14 is configured to display the operating status of the EMS device 1 based on instructions from the control unit 4. The specific structure of the display panel 14 is not particularly limited. For example, the display panel 14 in the EMS device 1 may be configured to display the operating mode of the EMS device 1, the intensity of electrical stimulation, and the remaining battery level.

[0070] like Figure 1 and Figures 3-6 As shown, a grounding portion 5 is provided on the lower surface 12 of the EMS device 1. Figure 4 and Figure 5 As shown, the grounding part 5 in the EMS device 1 is located at the center of the EMS device 1 in the front-to-back direction. Figure 3 and Figure 6 As shown, the grounding portion 5 extends integrally in the lateral direction of the EMS device 1. Additionally, as... Figure 4 and Figure 5 As shown, the outline of the grounding portion 5 in the cross-section orthogonal to the lateral direction has a downwardly convex arc shape with the center of the EMS device 1 in the front-rear direction as its vertex. The radius of curvature of the outline of the grounding portion 5 in the cross-section orthogonal to the lateral direction is the smallest at the vertex. Moreover, the radius of curvature gradually increases with the greater the distance from the vertex in the front-rear direction. The radius of curvature of the outline of the grounding portion 5 in the EMS device 1 is, for example, about 115 mm.

[0071] In addition, the portion of the lower surface 12 of the EMS device 1 from the grounding portion 5 to the front end 121 and the portion from the grounding portion 5 to the rear end 122 have a curved shape in which the profile in the cross section orthogonal to the lateral direction is an upwardly convex arc shape.

[0072] like Figure 4 and Figure 5 As shown, the EMS device 1 is configured to assume a reference posture when the grounding part 5 is placed on the ground F and the user's foot is not placed on the footrest 2. In this reference posture, both the front end 121 and the rear end 122 of the lower surface 12 of the EMS device 1 are separated from the ground F. In addition, the EMS device 1 has a center of gravity above the part (contact part) where the grounding part 5 contacts the ground F in the reference posture.

[0073] More specifically, the EMS device 1 can also be configured such that, in a reference posture, the height from the ground F to the front end 121 of the lower surface 12 is equal to the height from the ground F to the rear end 122 of the lower surface 12. In this case, the height from the ground F to the front end 121 of the lower surface 12 in the reference posture is, for example, about 30 mm.

[0074] Furthermore, when the EMS device 1 swings in the back-and-forth direction while the grounding part 5 is in contact with the ground, the ratio of the displacement L of the contact position between the grounding part 5 and the ground to the change in angle α of the EMS device 1, L / α, is, for example, about 2 mm / °. The specific calculation method for the value of the ratio L / α is as follows.

[0075] First, such as Figure 7 As shown by the dashed line, in the EMS device 1 after swinging forward from the reference posture, the EMS device 1 is held in posture P1 with both the front end 121 of its lower surface 12 and its grounding part 5 in contact with the ground F. The contact position C1 between the ground F and the grounding part 5 at this time is recorded. Additionally, the contact position C2 between the lower surface 12 and the ground F is recorded. Furthermore, the contact position C3 between the grounding part 5 and the ground F is recorded.

[0076] Next, the EMS device 1 is held in a position P2 where the rear end 122 of its lower surface 12 and its grounding portion 5 are in contact with the ground F after the device has been swung backward, to prevent the grounding portion 5 from sliding relative to the ground F. The contact position C4 between the ground F and the grounding portion 5 is recorded at this time. Then, the displacement L from the contact position C1 to the contact position C4 of the ground F is measured. In the EMS device 1, the displacement L of the contact position between the grounding portion 5 and the ground F is, for example, about 40 mm.

[0077] Furthermore, the angle between the straight line L1 connecting the contact position C2 of the lower surface 12 and the contact position C3 of the grounding part 5 and the ground F is measured in posture P2 when both the rear end 122 and the grounding part 5 of the EMS device 1 are in contact with the ground F. The measured angle is defined as the change in angle α of the EMS device 1. In the EMS device 1, the change in angle α obtained in this way is, for example, about 20°. Therefore, the ratio L / α in the EMS device 1 is, for example, about 2 mm / ° obtained by dividing the displacement L of the contact position by the change in angle α.

[0078] like Figures 1-3 As shown, support portions 7 (7L, 7R) are provided at both ends in the lateral direction of the EMS device 1. Each support portion 7 has a support surface 71 that is perpendicular to the lateral direction of the EMS device 1. The EMS device 1 is configured to be placed vertically with the support surface 71 facing downwards.

[0079] like Figure 4 As shown, in the first support portion 7L located on the left of the two support portions, two power terminals, including a first power terminal 72 and a second power terminal 73, can be provided. These power terminals are electrically connected to the energy storage device, which serves as the power supply unit 41, located within the EMS device 1. Thus, these power terminals are used to charge the energy storage device. More specifically, when the EMS device 1 is placed... Figure 8 When the placement platform 8 is shown, the first power terminal 72 contacts the contact portion 82 provided on the placement platform 8. Then, power is supplied to the power supply unit 41 via the contact portion 82. In addition, the second power terminal 73 is configured to supply power to the power supply unit 41 via a power adapter.

[0080] like Figure 5 and Figure 8 As shown, a remote control 74 for operating the EMS device 1 is detachably held on the second support portion 7R on the right side of the two support portions 7L and 7R. The remote control 74 in the EMS device 1 is configured to communicate wirelessly with the control unit 4. Similar to the operation panel 13, the user can instruct the control unit 4 of the EMS device 1 to perform the desired action by operating the remote control 74.

[0081] EMS device 1 can also be configured to be housed on a placement platform. For example, such as Figure 8 As shown, the EMS device 1 is configured to be placed upright on a placement platform 8 having a receiving recess 81. Here, the receiving recess 81 corresponds to the first support portion 7L. In addition, a contact portion 82 is provided in the center of the receiving recess 81 of the placement platform 8. The contact portion 82 is configured to contact the first power terminal 72 of the EMS device 1.

[0082] like Figure 9As shown, the EMS device 1 contains a control unit 4, a power supply unit 41, a contact detection unit 42, a communication unit 43, and a heater 44. The power supply unit 41 is configured to supply power to the control unit 4. The contact detection unit 42 is configured to determine the contact state between the electrode 3 and the user's body. The communication unit 43 is configured to communicate between the control unit 4 and external devices. The heater 44 is configured to heat the footrest 2. Although not shown in the figure, the heater 44 is located on the back of the footrest 2 inside the EMS device 1. Furthermore, the heater 44 is configured to generate heat using power supplied from the control unit 4. Thus, the heater 44 can heat the footrest 2.

[0083] like Figure 9 As shown, the control unit 4 is connected to the operation panel 13, display panel 14, power supply unit 41, contact detection unit 42, communication unit 43, heater 44, first electrode 3L, and second electrode 3R. Thus, the control unit 4 is configured to control the operation of the entire EMS device 1, including supplying power to the first electrode 3L and the second electrode 3R. The control unit 4 may also be composed of electronic circuitry or a microcomputer, for example.

[0084] Furthermore, the control unit 4 in this example is configured to apply voltage to the first electrode 3L and the second electrode 3R according to a pre-stored motion control program. This allows for the application of electrical stimulation with a predetermined pattern to the user's muscles. Examples of motion control programs include those aimed at increasing muscle strength, those aimed at simulating walking, and those aimed at muscle regulation.

[0085] The control unit 4 can be configured to implement a motion control program. Alternatively, the control unit 4 can be configured to implement a motion control program selected from a plurality of motion control programs. For example, the control unit 4 in this example is configured to select any one of three motion control programs, including a motion control program aimed at increasing muscle strength, a motion control program aimed at patterned walking, and a motion control program aimed at muscle regulation, and implement the selected motion control program.

[0086] Furthermore, the specific manner of operation of the control unit 4 will be described later.

[0087] The contact detection unit 42 is connected to the control unit 4, the first electrode 3L, and the second electrode 3R. Thus, the contact detection unit 42 is configured to determine whether either the first electrode 3L or the second electrode 3R is in contact with the user's body (electrode contact state) or whether at least one of the first electrode 3L or the second electrode 3R is separated from the user's body (electrode separation state). In this way, the contact detection unit 42 can notify the control unit 4 whether the determination result indicates an electrode contact state. The contact detection unit 42 may, for example, include a current sensor that measures the current flowing through the first electrode 3L and the current flowing through the second electrode 3R.

[0088] When both the first electrode 3L and the second electrode 3R are in contact with the user's body, if a voltage is applied to these electrodes 3, current flows through a loop that includes the electrodes 3 and the user's body. Therefore, in this situation, the contact detection unit 42 can determine whether the electrodes are in contact or out of contact based on the magnitude of the current measured by the current sensor. Furthermore, for example, the contact detection unit 42 can notify the control unit 4 whether the determination result indicates an electrode contact state by inputting the magnitude of the current measured by the current sensor to the control unit 4.

[0089] The power supply unit 41 is connected to the control unit 4 and is configured to supply the control unit 4 with the power required for its operation. The EMS device 1 has a power storage device that serves as the power supply unit 41. Furthermore, the EMS device 1 is configured to charge the power supply unit 41 via a first power terminal 72 or a second power terminal 73 provided on the first support portion 7L. Alternatively, the EMS device 1 can be configured to charge the power supply unit 41 via a contactless charging system.

[0090] The communication unit 43 is configured to enable communication between the control unit 4 and an external device. The communication content of the communication unit 43 is not particularly limited. For example, the communication unit 43 may be configured to send data stored in the control unit 4 or training history to the external device. Alternatively, the communication unit 43 may be configured to receive instructions related to the operation of the EMS device 1 or instructions related to changes in setting information from the external device. Furthermore, the communication unit 43 may be configured to perform wired communication with the external device. Additionally, the communication unit 43 may be configured to perform wireless communication with the external device.

[0091] Next, refer to Figure 10An example of how to use and operate the EMS device 1 will be described. When using the EMS device 1, for example, with both feet placed on the footrest 2 of the EMS device 1, the user operates the control panel 13 or the remote control 74. Thus, the EMS device 1 operates (step S1). Next, the user operates the control panel 13 or the remote control 74 as needed to select the type of motion control program (step S2).

[0092] If the EMS device 1 is operating, the control unit 4 supplies power to the first electrode 3L and the second electrode 3R, applying a pulsed voltage to the two electrodes (step S3). At this time, the control unit 4 establishes a potential difference between the first electrode 3L, which has a first polarity, and the second electrode 3R, which has a second polarity different from the first polarity. In addition, when the voltage is applied in step S3, the contact detection unit 42 measures the current flowing to the first electrode 3L and the current flowing to the second electrode 3R (step S4).

[0093] In the electrode contact state described above, a ring-shaped current path is formed, including the electrodes 3 and the user's body. Therefore, if a potential difference is formed between the first electrode 3L and the second electrode 3R in step S3, current flows into the ring-shaped current path. On the other hand, in the electrode separation state described above, the ring-shaped current path is not formed. Therefore, the control unit 4 can determine whether the electrodes 3 are in contact with the user's body based on the magnitude of the current flowing to the first electrode 3L and the second electrode 3R (step S5).

[0094] If an electrode separation state is detected in step S5 (step S5, "No"), the control unit 4 determines whether the elapsed time since step S1 has exceeded the preset contact standby time (step S51).

[0095] In step S51, if the elapsed time since step S1 is less than the contact standby time (step S51, "No"), the control unit 4 performs steps S3, S4, and S5 again. On the other hand, if the elapsed time since step S1 is longer than the contact standby time (step S51, "Yes"), the control unit 4 determines that the EMS device 1 has been malfunctioned and stops the operation of the EMS device 1.

[0096] If the electrode contact state is detected in step S5 (step S5, "Yes"), the control unit 4 supplies power to the first electrode 3L and the second electrode 3R according to the motion control program to apply electrical stimulation to the user's muscles (step S6). At this time, similar to step S3, the control unit 4 forms a potential difference between the first electrode 3L, which is of the first polarity, and the second electrode 3R, which is of the second polarity, to apply electrical stimulation to the user's muscles.

[0097] EMS device 1, for example, can apply EMS to a user sitting in a chair or similar chair with their feet resting on footrest 2. When the user places their feet on footrest 2, a potential difference is formed between the first electrode 3L and the second electrode 3R. Thus, for example, the user's calf muscles periodically contract and relax through electrical stimulation. Furthermore, with this contraction and relaxation, EMS device 1 oscillates in the back-and-forth direction. Additionally, with the oscillation of EMS device 1, the user's ankle joint extends or flexes. As a result, the user's calf, foot, or ankle movements can be promoted.

[0098] Furthermore, the EMS device 1 can also apply EMS to a user sitting on the ground with their calves resting on the footrest 2. When the user rests their calves on the footrest 2, if a potential difference is formed between the first electrode 3L and the second electrode 3R, the user's thigh muscles will periodically contract and relax through electrical stimulation. Moreover, with this contraction and relaxation, the EMS device 1 will swing in the back-and-forth direction. Additionally, with the swinging of the EMS device 1, the user's knee joint will extend or bend. As a result, the user's thigh or knee movements can be promoted.

[0099] Furthermore, during the application of electrical stimulation, the control unit 4 determines whether a preset termination condition is met (step S7). Examples of termination conditions include the end of the motion control program, separation of at least one electrode 3 from the user's body, and the user instructing the motion control program to stop. If the termination condition is not met (step S7, "No"), the control unit 4 confirms that the electrode is in contact with the user's body (step S5) and continues to perform EMS. On the other hand, if the termination condition is met, the control unit 4 stops the operation of the EMS device 1 (step S7, "Yes").

[0100] Next, the effects of the EMS device 1 according to Embodiment 1 will be explained. In the above-described EMS device 1, as... Figure 4 and Figure 5 As shown, the grounding portion 5 of its lower surface 12 bulges downwards from the front end 121 and rear end 122 of the lower surface 12. Furthermore, the EMS device 1 is configured to assume a reference posture when the grounding portion 5 is placed on the ground F and the user's foot is not supported by the footrest 2. In this reference posture, both the front end 121 and the rear end 122 of the EMS device 1 are separated from the ground F. Therefore, when the user uses the EMS device 1, it is not necessary to apply load to the footrest 2 using the toes or heels to separate the front end 121 and the rear end 122 of the EMS device 1 from the ground F. Additionally, the user can easily swing the EMS device 1 forward and backward from the aforementioned reference posture. Therefore, even when applying electrical stimulation to the muscles, the user can easily swing the EMS device 1.

[0101] Therefore, even users who have reasons for not being able to easily adjust the posture of the EMS device, such as those who are not used to EMS or those with relatively low muscle strength, can easily use the EMS device 1.

[0102] In addition, such as Figure 4 and Figure 5 As shown, when the grounding part 5 of the EMS device 1 is placed on the ground F, the height from the ground F to the front end 121 of the lower surface 12 can be set to 50mm or less, so that the height from the ground F to the front end 121 of the lower surface 12 is equal to the height from the ground F to the rear end 122 of the lower surface 12. Therefore, when the user places their foot on the footrest 2, the burden on their ankle can be reduced. Alternatively, the height from the ground F to the front end 121 of the lower surface 12 can be set to 10mm or more. Therefore, the user can swing the EMS device 1 appropriately in the back-and-forth direction, further enhancing the effect of promoting movement.

[0103] In addition, such as Figure 7 As shown, the ratio L / α of the displacement L of the contact position between the grounding part 5 and the ground relative to the change in angle α of the EMS device 1 when it swings in the back-and-forth direction while the grounding part 5 is in contact with the ground can be set within an appropriate range. Therefore, the posture of the EMS device 1 is more stable when it swings in the back-and-forth direction. Thus, when electrical stimulation is applied to the user's muscles, the posture of the EMS device 1 can be easily stabilized. Furthermore, the EMS device 1 can further enhance the effect of promoting the user's muscle movement.

[0104] like Figure 2 As shown, the EMS device 1 has a first raised portion 61 and a second raised portion 62, which are raised portions 6. The first raised portion 61 is positioned on the outside of the user's foot when the user's foot is placed on the footrest 2. The second raised portion 62 is positioned between the user's feet when the user's foot is placed on the footrest 2. Furthermore, the first raised portion 61 and the second raised portion 62 are separate from each other. Therefore, when the user places their foot on the footrest 2 of the EMS device 1, the raised portion 6 acts as a guide, making it easy to determine the position of the foot on the footrest 2. Additionally, the raised portion 6 easily restricts the displacement of the user's foot. Therefore, during use of the EMS device 1, the position of the user's foot is less likely to shift.

[0105] Furthermore, by providing the first raised portion 61 and the second raised portion 62 in the EMS device 1, for example, when a seated user places their calves on the raised portions 61 and performs EMS, the user can easily determine the position of their calves on the footrest 2 using the first raised portion 61 and the second raised portion 62 as guides. Additionally, the raised portions 61 and 62 easily restrict the displacement of the user's calves. Therefore, during use of the EMS device 1, the position of the user's calves is less likely to shift. As a result, the ease of use of the EMS device 1 can be further improved.

[0106] Furthermore, the distance between the first raised portion 61 and the second raised portion 62 at the front end 121 of the footrest 2 is wider than the distance between the first raised portion 61 and the second raised portion 62 at the rear end 122. Therefore, the first raised portion 61 and the second raised portion 62 can be arranged according to the shape of the user's foot. As a result, the ease of use of the EMS device 1 can be further improved.

[0107] Furthermore, the left first protrusion 61L, which is located on the outside of the user's foot, has a recess 611 on its inner side in the lateral direction that is recessed from the surrounding area. Therefore, when the user carries the EMS device 1, they can easily carry the EMS device 1 by placing their fingers in the recess 611 provided in the first protrusion 61L.

[0108] like Figure 1 As shown, the EMS device 1 has support portions 7 at both ends in the lateral direction. Furthermore, each support portion 7 has a support surface 71 perpendicular to the lateral direction of the EMS device 1. Therefore, when storing the EMS device 1, it can be placed upright with the support portions 7 in contact with the ground. This reduces the area occupied by the EMS device 1 during storage, further improving its ease of use.

[0109] like Figure 9 As shown, the EMS device 1 includes a heater 44 configured to heat the footrest 2. Therefore, by heating the user's body placed on the footrest 2, their muscles are relaxed. This can be expected to further enhance the exercise effect. Furthermore, heating the user's body placed on the footrest 2 promotes sweating from the user's body. Moreover, by promoting sweating from the user's body, the resistance between the electrodes 3 provided on the footrest 2 and the user's body can be further reduced using sweat. As a result, it is easier to apply electrical stimulation to the user's muscles.

[0110] Furthermore, the EMS device 1 has a center of gravity above the contact portion between the grounding part 5 and the ground in the reference posture. Therefore, when the EMS device 1 swings from the reference posture in the back-and-forth direction, the EMS device 1 can easily return to the reference posture. Thus, it is easier to stabilize the posture of the EMS device 1 when it swings in the back-and-forth direction.

[0111] (Second Implementation)

[0112] Other configurations of the grounding portion of the EMS device according to this embodiment will be described. Furthermore, unless otherwise specified, reference numerals used in the above description that are identical to those used in the description of the first embodiment indicate the same constituent elements as those in the EMS device according to the first embodiment.

[0113] As mentioned above, the grounding portion of the EMS device can have any shape, as long as it allows the EMS device to swing at least in the front-to-back direction. For example, in Figure 11 The upper surface 11 of the EMS device 102 shown has a footrest 2 for supporting the user's feet, a pair of electrodes 3, a first raised portion 61, and a second raised portion 62. The pair of electrodes 3 are located on the footrest 2. The first raised portion 61 and the second raised portion 62 are located around the footrest 2. Additionally, although not shown in the figure, the EMS device 102 has a control unit configured to supply power to the electrodes 3. Furthermore, the lower surface 12 of the EMS device 102 has a grounding portion 502 that bulges hemispherically from the center of the lower surface 12. The EMS device 102 with this grounding portion 502 can swing in multiple directions, including the front-back direction.

[0114] Additionally, for example, in Figure 12 The upper surface 11 of the EMS device 103 shown has a footrest 2 for supporting the user's feet, a pair of electrodes 3, a first raised portion 61, and a second raised portion 62. The pair of electrodes 3 are provided on the footrest 2. The first raised portion 61 and the second raised portion 62 are provided around the footrest 2. Additionally, although not shown in the figure, the EMS device 103 has a control unit configured to supply power to the electrodes 3. Furthermore, on the lower surface 12 of the EMS device 103, two grounding portions 503 are provided at intervals along the side of the EMS device 103. The grounding portions 503 of the EMS device 103 bulge hemispherically on the lower surface 12 of the EMS device 103. The EMS device 103 with these grounding portions 503 can swing in the back-and-forth direction.

[0115] Additionally, for example, in Figure 13The upper surface 11 of the EMS device 104 shown has footrests 2 for supporting the user's feet, a pair of electrodes 3, a first raised portion 61, and a second raised portion 62. The pair of electrodes 3 are located on the footrests 2. The first raised portion 61 and the second raised portion 62 are located around the footrests 2. Additionally, although not shown in the figure, the EMS device 104 has a control unit configured to supply power to the electrodes 3. Furthermore, on the lower surface 12 of the EMS device 104, two grounding portions 504 are provided at intervals along the side of the EMS device 104. The grounding portions 504 of the EMS device 104 protrude in a semi-cylindrical shape on the lower surface 12 of the EMS device 104. Furthermore, the grounding portions 504 are configured such that their axial direction is parallel to the side direction of the EMS device 104. The EMS device 104, with these grounding portions 504, can swing in the back-and-forth direction.

[0116] (Comparative Example 1)

[0117] In this example, an example of an EMS device having a value of L / α that differs from the EMS devices described in the first and second embodiments will be explained. For example... Figure 14 As shown, the EMS device 9 in this example includes a disc-shaped main body 91, a pair of electrodes 92, and a grounding portion 93. The pair of electrodes 92 are disposed on the upper surface 911 of the main body 91. The grounding portion 93 is disposed on the lower surface 912 of the main body 91. The grounding portion 93 in the EMS device 9 of this example has a shape that bulges out in a semi-cylindrical shape on the lower surface 912 of the main body 91. The radius of curvature of the outline of the grounding portion 93 when viewed from the side in the EMS device 9 is approximately 20 mm.

[0118] Using the same method as in the first embodiment, the EMS device 9 of this example is oscillated in the back-and-forth direction. The change in angle α and the displacement L of the contact position between the grounding part and the ground are measured. The measured change in angle α is approximately 20°. The displacement L of the contact position between the grounding part and the ground is approximately 7 mm. Therefore, the ratio L / α of the displacement L of the contact position between the ground and the grounding part 93 in this example EMS device 9 to the change in angle α is 0.35 mm / °.

[0119] In this example, the L / α ratio in the EMS device 9 is smaller than the range described in the first embodiment. Therefore, when the EMS device 9 is swung in the back-and-forth direction, its posture changes drastically. Furthermore, the posture of the EMS device 9 is prone to instability. Therefore, depending on the circumstances, there are concerns that users may find the EMS device 9 difficult to operate.

[0120] The EMS apparatus according to the first and second embodiments has been described above. However, the specific structure of the EMS apparatus according to this embodiment is not limited to the structure of the EMS apparatus described above. The structure of the EMS apparatus described above can be appropriately modified without prejudice to the spirit of this disclosure.

[0121] For example, the first embodiment shows an example where the EMS device 1 is provided with two power terminals: a first power terminal 72 and a second power terminal 73. However, the number of power terminals provided in the EMS device 1 may also be one. In this case, the power terminals may also be configured to charge the power supply unit 41 via a power adapter. Alternatively, the power terminals may also be configured to charge the power supply unit 41 via the placement platform 8.

[0122] In addition, in the first embodiment, an example is shown in which both the first power terminal 72 and the second power terminal 73 are disposed on the first bracket portion 7L. Figure 4 , Figure 8 However, it is also possible to place the first power terminal 72 on one of the two support portions 7 and the second power terminal 73 on the other support portion. In this case, for example, the support portion 7 with the first power terminal 72 is placed on the placement table 8. Thus, the power supply unit 41 can be charged via the first power terminal 72. Alternatively, the EMS device can be placed upright with the support portion having the second power terminal 73 facing upwards. Thus, even in locations where the placement table 8 is not provided, the power supply unit 41 can be charged via the second power terminal 73.

[0123] Furthermore, in Embodiments 1 and 2, examples were described in which a first raised portion 61 and a second raised portion 62 are provided on the upper surface 11 of the EMS devices 1 and 102. However, it is also possible to provide only either the first raised portion 61 or the second raised portion 62 on the upper surface of the EMS device. Alternatively, it is also possible to not provide any raised portions on the upper surface of the EMS device.

[0124] Alternatively, a downward-protruding protrusion can be provided on the lower surface of the EMS device. In this case, it is easier to prevent excessive tilting when the EMS device swings in the back-and-forth direction. Furthermore, if a protrusion is provided on the lower surface of the EMS device, the protrusion can also have a sensor for detecting contact with the ground. In this case, the number of swings of the EMS device can be measured using the sensor provided on the protrusion. Additionally, if a protrusion is provided on the lower surface of the EMS device, the protrusion can also have a counterweight. By providing a counterweight on the protrusion in this way, it is easier to make the EMS device swing in the back-and-forth direction.

[0125] Alternatively, a counterweight can be installed inside the grounding part of the EMS device. In this case, it is easier to stabilize the posture of the EMS device.

[0126] Furthermore, the grounding part of the EMS device can also be configured to be detachable. In this case, for example, multiple grounding parts with different shapes are prepared. Then, the grounding part selected from these grounding parts according to the user's wishes is installed. As a result, the balance between the ease of swinging and the stability of the posture during swinging of the EMS device can be easily adjusted according to the user's wishes. In addition, in this case, the appearance of the EMS device when it is placed upright can be changed according to the user's wishes.

[0127] In addition, the above-mentioned EMS device may be adopted in the manner shown in [1-1] to [1-10] below.

[0128] [1-1] A muscle electrical stimulation device configured to apply electrical stimulation to a user's muscles, the muscle electrical stimulation device comprising: a footrest disposed on the upper surface of the muscle electrical stimulation device for supporting the user's feet; at least one pair of electrodes disposed on the footrest; a control unit configured to supply power to the electrodes; and a grounding portion bulging downward beyond the front and rear ends of the lower surface of the muscle electrical stimulation device, the muscle electrical stimulation device being configured to swing in a back-and-forth direction while the grounding portion is in contact with the ground, the muscle electrical stimulation device being configured to take a reference posture when the grounding portion is placed on the ground and the footrest is not supporting the user's feet, in which the front and rear ends of the muscle electrical stimulation device are separated from the ground.

[0129] [1-2] According to the muscle electrical stimulation device described in [1-1], in the above-mentioned reference posture, there is a center of gravity above the contact portion between the grounding portion and the ground.

[0130] [1-3] According to the muscle electrical stimulation device described in [1-1] or [1-2], when the muscle electrical stimulation device swings in the back-and-forth direction with the grounding part in contact with the ground, the ratio of the displacement L of the contact position between the grounding part and the ground on the ground to the change of angle α is in the range of 1 mm / ° or more and 5 mm / ° or less.

[0131] [1-4] The muscle electrical stimulation device described in any one of [1-1] to [1-3] includes a raised portion disposed around the foot rest portion and raised upward above the electrodes.

[0132] [1-5] According to the muscle electrical stimulation device described in [1-4], the raised portion is configured to be positioned on the outside of the user's foot when the user's foot is placed on the footrest.

[0133] [1-6] According to the muscle electrical stimulation device described in [1-4], the raised portion is configured to be positioned between the user's feet when the user's feet are placed on the footrest.

[0134] [1-7] According to the muscle electrical stimulation device described in [1-4], the raised portion includes a first raised portion and a second raised portion. The first raised portion is arranged on the outside of the user's foot when the user's foot is placed on the footrest, and the second raised portion is arranged between the user's feet when the user's foot is placed on the footrest. The first raised portion and the second raised portion are separate from each other.

[0135] [1-8] According to the muscle electrical stimulation device described in [1-7], the distance between the front end of the first ridge and the front end of the second ridge is wider than the distance between the rear end of the first ridge and the rear end of the second ridge.

[0136] [1-9] The muscle electrical stimulation device described in any one of [1-1] to [1-8] has a support portion at its end in the lateral direction, which includes a support surface perpendicular to the lateral direction.

[0137] [1-10] The muscle electrical stimulation device described in any one of [1-1] to [1-9] includes a heater configured to heat the footrest.

[0138] Alternatively, from another perspective, the aforementioned EMS device can also be understood as a device with raised portions on its upper surface to suppress accidental current transfer between electrodes. That is, the aforementioned EMS device may, for example, have the structures shown in [2-1] to [2-10] below.

[0139] [2-1] A muscle electrical stimulation device configured to apply electrical stimulation to the muscles of a user, the muscle electrical stimulation device comprising: a footrest provided on the upper surface of the muscle electrical stimulation device for supporting the user's feet; at least one pair of electrodes provided on the footrest; a control unit configured to supply power to the electrodes; a grounding portion bulging downward beyond the front and rear ends of the lower surface of the muscle electrical stimulation device; and a raised portion provided around the footrest and bulging upward beyond the electrodes, the muscle electrical stimulation device being configured to swing in the back-and-forth direction while the grounding portion is in contact with the ground.

[0140] [2-2] According to the muscle electrical stimulation device described in [2-1], the raised portion is configured to be positioned on the outside of the user's foot when the user's foot is placed on the footrest.

[0141] [2-3] According to the muscle electrical stimulation device described in [2-1], the raised portion is configured to be positioned between the user's feet when the user's feet are placed on the footrest.

[0142] [2-4] According to the muscle electrical stimulation device described in [2-1], the raised portion includes a first raised portion and a second raised portion. The first raised portion is arranged on the outside of the user's foot when the user's foot is placed on the footrest, and the second raised portion is arranged between the user's feet when the user's foot is placed on the footrest. The first raised portion and the second raised portion are separate from each other.

[0143] [2-5] According to the muscle electrical stimulation device described in [2-4], the distance between the front end of the first ridge and the front end of the second ridge is wider than the distance between the rear end of the first ridge and the rear end of the second ridge.

[0144] [2-6] The muscle electrical stimulation device described in any one of [2-1] to [2-5] has a support portion at its end in the lateral direction, which includes a support surface perpendicular to the lateral direction.

[0145] [2-7] The muscle electrical stimulation device described in any one of [2-1] to [2-6] includes a heater configured to heat the aforementioned footrest.

[0146] [2-8] According to any one of [2-1] to [2-7], the muscle electrical stimulation device is configured such that when the grounding part is placed on the ground and the user's foot is not placed on the footrest, a reference posture is adopted, in which the front end and the rear end of the muscle electrical stimulation device are separated from the ground.

[0147] [2-9] According to the muscle electrical stimulation device described in [2-8], in the above-mentioned reference posture, there is a center of gravity above the contact portion between the grounding portion and the ground.

[0148] [2-10] According to any one of [2-1] to [2-9], when the grounding part is in contact with the ground and the muscle electrical stimulation device swings in the back-and-forth direction, the ratio of the displacement L of the contact position between the grounding part and the ground on the ground to the change of angle α is in the range of 1 mm / ° or more and 5 mm / ° or less.

[0149] The effects of the muscle electrical stimulation devices disclosed in [2-1] to [2-10] are the same as those of the muscle electrical stimulation devices with corresponding structures disclosed in [1-1] to [1-10].

[0150] Explanation of reference numerals in the attached figures

[0151] 1, 102…muscle electrical stimulation device; 11…upper surface; 12…lower surface; 2…foot rest; 3…electrode; 4…control unit; 5, 502~504…grounding unit.

Claims

1. A muscle electrical stimulation device configured to apply electrical stimulation to a user's muscles, characterized in that, The muscle electrical stimulation device includes: a footrest disposed on the upper surface of the device for supporting the user's feet; at least one pair of electrodes disposed on the footrest; a control unit configured to supply power to the electrodes; and a grounding portion that bulges downward beyond the front and rear ends of the lower surface of the device. The muscle electrical stimulation device is configured to swing in the back-and-forth direction while the grounding part is in contact with the ground. The muscle electrical stimulation device is configured to take a reference posture when the grounding part is placed on the ground and the footrest is not supporting the user's foot. In the reference posture, both the front and rear ends of the muscle electrical stimulation device are separated from the ground.

2. The muscle electrical stimulation device according to claim 1, characterized in that, In the reference posture, there is a center of gravity above the contact portion between the grounding part and the ground.

3. The muscle electrical stimulation device according to claim 1, characterized in that, When the muscle electrical stimulation device swings in the back-and-forth direction with the grounding part in contact with the ground, the ratio of the displacement L of the contact position between the grounding part and the ground on the ground to the change in angle α is in the range of 1 mm / ° to 5 mm / °.

4. The muscle electrical stimulation device according to claim 1, characterized in that, It includes a raised portion disposed around the foot rest portion and raised upward above the electrode.

5. The muscle electrical stimulation device according to claim 4, characterized in that, The raised portion is configured to be positioned on the outside of the foot when the user's foot is placed on the footrest.

6. The muscle electrical stimulation device according to claim 4, characterized in that, The raised portion is configured to be positioned between the user's feet when the user's feet are placed on the footrest.

7. The muscle electrical stimulation device according to claim 4, characterized in that, The raised portion includes a first raised portion and a second raised portion. The first raised portion is configured to be positioned on the outside of the user's foot when the user's foot is placed on the footrest. The second raised portion is configured to be positioned between the user's feet when the user's feet are resting on the footrest. The first raised portion and the second raised portion are separated from each other.

8. The muscle electrical stimulation device according to claim 7, characterized in that, The distance between the front end of the first raised portion and the front end of the second raised portion is wider than the distance between the rear end of the first raised portion and the rear end of the second raised portion.

9. The muscle electrical stimulation device according to any one of claims 1 to 8, characterized in that, The end in the lateral direction has a support portion including a support surface perpendicular to the lateral direction.

10. The muscle electrical stimulation device according to any one of claims 1 to 8, characterized in that, Includes a heater, which is configured to heat the footrest portion.

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