balance board
The balance board design with a swingable body support unit and reaction force mechanism addresses the instability issue of conventional boards, facilitating effective balance training by maintaining the body axis and reducing strain.
Patent Information
- Application Number
- JP2022033612
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-03-04
- Publication Date
- 2026-01-28
- Estimated Expiration
- 2042-03-04
AI Technical Summary
Conventional balance boards cause unnecessary strain during balance training due to the structure that leads to unstable center of gravity shifts, making it difficult to maintain the body axis, thus hindering effective balance training.
A balance board design with a plate-shaped body support and a curved portion that allows for a swingable body support unit, providing a reaction force to keep the center of gravity within a stable horizontal range, enabling natural posture maintenance and reducing strain.
Enables effective balance training without unnecessary strain by maintaining the body axis in an appropriate position, allowing for natural skeletal movements and improved motor functions.
Smart Images
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Abstract
Description
[Technical Field]
[0001] The present invention relates to a balance board used for balance training to improve balance. [Background technology]
[0002] In recent years, with the rise in health consciousness, an increasing number of people are practicing fitness training, and various tools for training balance have been developed. One type of tool is a highly functional training device equipped with electrical components such as magnetic sensors and electrical control circuits, and mechanical units such as a transmission gear set, as exemplified in Patent Document 1. In addition, simple training tools consisting only of mechanical elements (hereinafter referred to as "balance boards") are also popular as common tools, and are widely used by many people, especially because they can be easily used at home.
[0003] Fig. 12 is an explanatory diagram showing an outline of a balance board according to the prior art, and Fig. 13 shows a state in which training is being performed using the balance board shown in Fig. 12. As shown in Fig. 12, a commonly used conventional balance board 101 has a body support part 110 having a support surface 111 that comes into contact with the feet placed on it, and a ground support part 120 that is connected to this body support part 110 on the opposite side of support surface 111 and is formed with a spherical (including approximately spherical) curved surface 121. This curved surface 121 comes into contact with the floor FL of the training area.
[0004] 13, in a conventional balance board 101, when a trainee HM is placed on the support surface 111 of the body support unit 110, the weight of the balance board 101 and the weight of the person HM act on a contact area Q of the curved surface 121 of the ground support unit 120 that is in local contact with the floor surface FL. At this time, the position of the trainee HM on the support surface 111 is very unstable. For this reason, it is believed that the trainee HM can train his or her sense of balance by constantly controlling and adjusting his or her own position (balance) in accordance with the inclination of the body support unit 110 in an attempt to maintain the resting position.
[0005] It should be noted that the balance board 101 according to the conventional technology is a publicly available technology, and therefore no prior art documents will be disclosed. [Prior art documents] [Patent documents]
[0006] [Patent Document 1] Japanese Patent Publication No. 2021-133227 Summary of the Invention [Problem to be solved by the invention]
[0007] However, conventional balance boards 101 have the problem that they tend to cause unnecessary strain, which can be an obstacle to training the sense of balance. This problem arises from the structure of the conventional balance board 101, as described below.
[0008] For ease of explanation, the left-right direction in FIG. 13 is defined as the horizontal direction HZ along the floor surface FL, and the up-down direction is defined as the vertical direction VT perpendicular to the floor surface FL. The reason for this problem will be explained below by considering the behavior of the trainee HM in the resting state as a two-dimensional movement swaying left and right between an upright position along the vertical direction VT.
[0009] As shown in Figure 13, the normal to the curved surface 121 at the contact area Q is an imaginary axis AX that corresponds to the body axis of the trainee HM. With the conventional balance board 101, when the trainee HM is in the resting state, and the trainee HM is in an upright position S0, the center of gravity G0 of the trainee HM is located on an imaginary axis AX that is aligned with the vertical direction VT, directly above the contact area Q0. However, when the trainee HM is in a leftward tilted position S1, the ground support part 120 rotates counterclockwise from the position in the upright position S0, causing the contact area Q1 to move to the left of the contact area Q0 and the imaginary axis AX to tilt to the left, and the position of the center of gravity G1 of the trainee HM changes from the center of gravity G0 in the upright position S0. Similarly, when the trainee HM is in a tilted state S2 to the right, the ground contact support part 120 rotates clockwise from the position in the upright state S0, so that the ground contact part Q2 moves to the right of the ground contact part Q0, the virtual axis line AX also tilts to the right, and the position of the center of gravity G2 of the trainee HM changes from the center of gravity G0 in the upright state S0.
[0010] In this way, when the trainee HM moves from the upright state S0 to either the left or right tilted state S1 or S2, the center of gravity G of the trainee HM moves outward in the horizontal direction HZ, away from the position of the center of gravity G0 in the upright state S0. If the trainee HM tilts with his or her center of gravity G placed on the tilted imaginary axis AX, the trainee HM will become in a very unstable position and may fall. Therefore, in order to avoid falling, the trainee HM will consciously try to adjust his or her position (balance) by controlling his or her body, in particular, by adjusting it closer to the position of the upright state S0, which will result in unnecessary strain that is not intended to train the sense of balance.
[0011] As described above, in the conventional balance board 101, the trainee HM is supported by the contact area Q, which is located within the spherical curved surface 121, with respect to the floor surface FL. Therefore, when the trainee HM changes his / her posture while resting, the imaginary axis AX of the trainee HM tilts. That is, the movement of the ground support part 120, which is accompanied by the tilt of the imaginary axis AX, is a swinging motion centered on point M, which is located below the floor surface FL. Because the behavior of the ground support part 120 is such a swinging motion, it is difficult for the trainee HM to position his / her center of gravity G on the tilted imaginary axis AX and adjust his / her posture to avoid falling. Therefore, as described above, when training his / her sense of balance, the trainee HM inevitably exerts unnecessary strain, which may prevent him / her from performing training to train his / her sense of balance while maintaining his / her body axis (imaginary axis AX) in an appropriate position.
[0012] The training equipment disclosed in Patent Document 1 has a complex structure and limited freedom of movement, making it unsuitable for training the body while maintaining the body axis in an appropriate position.
[0013] The present invention has been made to solve the above problems, and aims to provide a balance board that allows training to be performed while keeping the body axis in an appropriate position, without unnecessary strain, when training the sense of balance. [Means for solving the problem]
[0014] In one aspect of the present invention, which has been made to solve the above problems, the balance board has a plate-shaped body support portion including a support surface that can come into contact with the trainee's body, and a curved portion formed by a first curved surface around a reference position, with the curved portion located on the opposite side of the support surface.The balance board also has a base on which the body support portion is placed and supported, and the base has a support portion that can come into contact with the curved portion when the body support portion is placed on it.The support portion has a support surface formed by a second curved surface that acts as a reaction force above the body support portion and toward the reference position against the load transmitted from the body support portion via the support portion.The body support portion is placed on the base in a swingable state by the support portion.
[0015] According to this aspect, when a trainee uses the balance board of the present invention for training, the body support unit oscillates in an arc around the trainee's center of gravity relative to the support surface, depending on the trainee's standing position. When the trainee stands on the support surface, even if the body support unit tilts on the support unit, a reaction force from the trainee's weight acts on the trainee. As a result, the trainee's center of gravity remains within a horizontal range inside the support unit and does not significantly shift from its upright position. Therefore, even when the trainee stands on the support surface of the body support unit, the trainee's center of gravity does not shift significantly, making it easy to maintain its position. This allows the trainee to maintain their balance and continue standing in a natural posture on the support surface of the body support unit. Therefore, since a trainee can maintain a natural posture even when standing on the support surface of the body support unit, unnecessary strain can be suppressed, enabling balance training. Furthermore, by using the balance board of the present invention, trainees can avoid unnecessary strain on their own bodies, induce natural skeletal movements, train their sense of balance, and improve their motor functions.
[0016] In the above aspect, it is preferable that the support portion is formed in a spherical shape and is arranged rotatably relative to the base at at least three points around an axis passing through the reference portion, and that the support surface is the spherical surface of the support portion.
[0017] According to this embodiment, the body support unit allows for unlimited tilted rocking motion in all directions (360 degrees) around the reference position, allowing the trainee standing on the support surface of the body support unit to freely control their own posture (balance) in all directions, including left-right and front-back, and to train their sense of balance.
[0018] In the above aspect, it is preferable that the support portion is formed in a cylindrical shape and is arranged on both sides of an axis passing through the reference portion so as to be rotatable relative to the base, and that the support surface is the outer peripheral surface of the support portion.
[0019] According to this aspect, the body support unit is capable of unidirectional swinging motion, combining a horizontal direction and a vertical direction, set in one direction, like a seesaw, with a reference part as the fulcrum. Therefore, the trainee standing on the support surface of the body support unit can control his or her own posture (balance) in one direction, such as left or right or front or back, and can carry out training to improve his or her sense of balance in the direction he or she wishes to improve.
[0020] In the above aspect, it is preferable that the base has a regulating surface that regulates the tilt of the body resting portion placed on the support portion.
[0021] According to this aspect, even when the trainee stands on the support surface, the body support portion does not tilt excessively more than necessary, thereby preventing the body support portion from falling off the base due to the trainee's standing position on the support surface. [Effects of the Invention]
[0022] Therefore, the balance board according to the present invention has the excellent effect of enabling training of the sense of balance without unnecessary strain and while keeping the body axis in an appropriate position. [Brief explanation of the drawings]
[0023] [Figure 1] FIG. 1 is a front view of a balance board according to Example 1 of an embodiment. [Figure 2] 2A and 2B are diagrams showing the body resting portion of the balance board shown in FIG. 1, in which (A) is a plan view seen from the resting surface side, and (B) is a front view. [Figure 3] 2A and 2B are diagrams showing the base of the balance board shown in FIG. 1, in which (A) is a plan view seen from above and (B) is a front view. [Figure 4] 1 is an exploded perspective view showing a balance board according to Example 1 of an embodiment, with the body rest section separated from the base. FIG. [Figure 5] FIG. 2 is an explanatory diagram showing a state in which training is being performed using the balance board shown in FIG. [Figure 6] 1A to 1C are diagrams illustrating the operation of the balance board according to Example 1 of the embodiment. [Figure 7] FIG. 10 is a front view of a balance board according to Example 2 of the embodiment. [Figure 8] 8A and 8B are diagrams showing the body resting portion of the balance board shown in FIG. 7, where (A) is a plan view seen from the resting surface side, and (B) is a front view. [Figure 9] 8A and 8B are diagrams showing the base of the balance board shown in FIG. 7, where (A) is a plan view seen from above and (B) is a front view. [Figure 10] FIG. 10 is an exploded perspective view showing a balance board according to Example 2 of the embodiment, with the body rest section separated from the base. [Figure 11] 10A and 10B are diagrams illustrating the operation of the balance board according to Example 2 of the embodiment. [Figure 12] FIG. 1 is an explanatory diagram showing an outline of a balance board according to the prior art. [Figure 13]FIG. 13 is an explanatory diagram showing a state in which training is being performed using the balance board shown in FIG. 12. DETAILED DESCRIPTION OF THE INVENTION
[0024] Hereinafter, examples 1 and 2 of the balance board according to the present invention will be described in detail with reference to the drawings. The balance board according to the present invention is a training tool used for training the sense of balance.
[0025] First, an overview of a balance board 1 according to an embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 is a front view of a balance board according to Example 1 of the embodiment. FIG. 2 is a diagram showing the body support portion of the balance board shown in FIG. 1, with (A) being a plan view seen from the support surface side and (B) being a front view. FIG. 3 is a diagram showing the base of the balance board shown in FIG. 1, with (A) being a plan view seen from above and (B) being a front view. FIG. 4 is an exploded perspective view showing the balance board according to Example 1 of the embodiment with the body support portion separated from the base. FIG. 5 is an explanatory diagram showing a state in which training is being performed using the balance board shown in FIG. 1. In this embodiment, the directions of the balance board 1 are defined as the "horizontal direction HZ" in FIG. 1, from the upper left to the lower right, and penetrating the page, and the "vertical direction VT" in FIG. 2 and the subsequent drawings also follow the directions defined in FIG. 1.
[0026] As shown in Figs. 1 to 4, balance board 1 is broadly composed of body support section 10, curved section 20, and base 30. Body support section 10 is formed in a plate shape including support surface 11 that can come into contact with both feet, which are part of the trainee's body. Curved section 20 is disposed on the opposite side of support surface 11 of body support section 10, and is formed around reference position C by curved surface 21 (first curved surface).
[0027] As shown in FIG. 1, the base 30 has a support portion 31 that can come into contact with the curved portion 20 when the body support portion 10 is placed on it. As shown in FIG. 5, the support portion 31 has a support surface 32 formed by a second curved surface that acts as a reaction force N above the body support portion 10 and toward the reference position C in response to the load W transmitted from the body support portion 10 via the support portion 31. In the balance board 1, the body support portion 10 is placed on the base 30 by the support portion 31 in a swingable state. The base 30 has an upper surface 35 (regulating surface) that regulates the tilt of the body support portion 10 placed on the support portion 31.
[0028] Next, a balance board 1A (1) according to Example 1 will be described. As shown in Figures 1 to 4, in the balance board 1A according to Example 1, the body support portion 10 is a body support portion 10A having a support surface 11 that is a circular support surface 11A, and the curved portion 20 is a curved portion 20A that is disposed toward the center of the body support portion 10A on the opposite side from the support surface 11A. In the curved portion 20A, the curved surface 21 is a curved surface 21A that expands spherically around the reference position C.
[0029] The support portion 31 is a spherical support portion 31A, just like the balls in a ball bearing. The support portion 31A is held by a holder 38A so as to be rotatable relative to the main body of the base 30A (base 30). In this embodiment, the support portion 31A is provided at six locations around an axis L passing through the reference position C, on an attachment surface 36A that is located lower than an upper surface 35A (upper surface 35) of the main body of the base 30A. The support surface 32 is a curved surface 21A that corresponds to the entire spherical surface of the support portion 31A. In the balance board 1A according to Example 1, the curved surface 21A of the curved portion 20A is separated from the attachment surface 36A of the main body of the base 30A even at a proximity position P, where it is closest to the attachment surface 36A, but the position of this proximity position P remains stationary regardless of the rocking motion of the body support portion 10A.
[0030] Next, a balance board 1B(1) according to Example 2 will be described. Fig. 7 is a front view of the balance board according to Example 2 of the embodiment. Fig. 8 is a diagram showing the body support portion of the balance board shown in Fig. 7, where (A) is a plan view seen from the support surface side and (B) is a front view. Fig. 9 is a diagram showing the base of the balance board shown in Fig. 7, where (A) is a plan view seen from above and (B) is a front view. Fig. 10 is an exploded perspective view showing the balance board according to Example 2 of the embodiment with the body support portion separated from the base.
[0031] 7 to 10, in balance board 1B according to Example 2, body support portion 10 has support surface 11B, which is a substantially rectangular support surface 11B with four rounded corners, and curved portion 20 is curved portion 20B, which is disposed toward the center of body support portion 10B on the opposite side of support surface 11B. In curved portion 20B, curved surface 21 is curved surface 21B, which is formed around reference portion C as a circular arc-shaped curved surface that forms part of the outer circumferential surface of a cylinder.
[0032] The support portion 31 is a cylindrical support portion 31B. The support portion 31B is held by a holder 38B so as to be rotatable relative to the main body of the base 30B (base 30). In this embodiment, the support portion 31B is provided with one mounting surface 36B on each side of the axis L passing through the reference position C, the mounting surface 36B being lower than the upper surface 35B (upper surface 35) of the main body of the base 30B. The support surface 32 is a curved surface 21B corresponding to the entire cylindrical outer circumferential surface of the support portion 31B. In the balance board 1B according to Example 2, the curved surface 21B of the curved portion 20B is also separated from the mounting surface 36B of the main body of the base 30B even at the closest proximity position P, but the position of this proximity position P remains stationary regardless of the rocking motion of the body support portion 10B.
[0033] Next, a brief description will be given of how to train your sense of balance using the balance board 1 according to the embodiment.
[0034] First, to perform training, base 30 with support surface 11 facing upward is placed on the floor surface FL of a horizontal training area, and curved portion 20 of body support portion 10 is placed on support portion 31 of base 30 so that curved surface 21 of curved portion 20 and support surface 32 of support portion 31 abut against each other, and balance board 1 is set on floor surface FL. Next, as shown in FIG. 5 , trainee HM places both feet on support surface 11 of balance board 1 and stands on body support portion 10. At this time, body support portion 10 is placed in an unstable state on support portion 31, making it prone to swinging. Therefore, trainee HM must maintain his or her balance while controlling the unstable body support portion 10 and consciously maintain standing by performing the movements (exercises) necessary to train his or her sense of balance.
[0035] Next, the operation and effect of the balance board 1 according to this embodiment will be described. Fig. 6 is a diagram illustrating the operation of the balance board according to Example 1 of the embodiment, and Fig. 11 is a diagram illustrating the operation of the balance board according to Example 2 of the embodiment.
[0036] The balance board 1 (1A, 1B) of this embodiment has a plate-shaped body support portion 10 including a support surface 11 that can come into contact with the body of the trainee HM, and a curved portion 20 formed by a curved surface 21 (first curved surface) around a reference point C, with the curved portion 20 located on the opposite side of the support surface 11.The balance board is also characterized in that it is equipped with a base 30 on which the body support portion 10 is placed and supported, and the base 30 has a support portion 31 that can come into contact with the curved portion 20 when the body support portion 10 is placed on it, and the support portion 31 has a support surface 32 formed by a second curved surface that acts as a reaction force N above the body support portion 10 and toward the reference point C against the load W transmitted from the body support portion 10 via the support portion 31, and the body support portion 10 is placed on the base 30 by the support portion 31 in a swingable state.
[0037] Due to this feature, when a trainee HM uses the balance board 1 to train, as shown in Fig. 5, the body support unit 10 performs an arcuate swinging motion centered around the vicinity of the trainee HM's center of gravity G relative to the support surface 11, depending on the trainee HM's standing position. At this time, when the trainee HM is standing on the support surface 11, even if the body support unit 10 is tilted on the support unit 31, a reaction force N of the load W by the trainee HM acts on the trainee HM, as shown in Figs. 6 and 11. As a result, the position of the trainee HM's center of gravity G remains within a range inside the support unit 31 in the horizontal direction HZ, and does not change significantly from the upright position. Therefore, even when the trainee HM is standing on the support surface 11 of the body support unit 10, the center of gravity G does not shift significantly and the trainee HM is in a state where the position of the center of gravity G can be easily maintained, and the trainee HM can step strongly into the support surface 11 in this state while maintaining his or her own body axis, thereby maintaining his or her own balance and continuing to stand in a natural posture on the support surface 11 of the body support unit 10. Therefore, even when the trainee HM is standing on the support surface 11 of the body support unit 10, the trainee HM can maintain a natural posture and can perform training while suppressing the generation of unnecessary strain.
[0038] Furthermore, by using the balance board 1, the trainee HM can avoid unnecessary strain on his or her body, induce natural skeletal movement, train the sense of balance, and improve motor function.
[0039] Therefore, the balance board 1 according to this embodiment has the excellent effect of enabling training of the sense of balance without unnecessary strain and while keeping the body axis in an appropriate position.
[0040] Furthermore, in the balance board 1A(1) of this embodiment, the support portion 31A (support portion 31) is formed in a spherical shape and is arranged rotatably relative to the base 30A (base 30) at a total of six locations around the axis L passing through the reference position C, and the support surface 32A (support surface 32) is the spherical surface of the support portion 31A.
[0041] This feature allows the body support unit 10A (10) to perform unlimited tilted rocking motion in all directions of 360 degrees around the reference position C. Therefore, the trainee HM standing on the support surface 11A (11) of the body support unit 10A can freely control his / her own body position (balance) in all directions, including left / right and front / back, and can train to improve his / her sense of balance.
[0042] Furthermore, in the balance board 1B(1) of this embodiment, the support portion 31B (support portion 31) is formed in a cylindrical shape and is arranged on both sides of the axis L passing through the reference position C so as to be rotatable relative to the base 30B (base 30), and the support surface 32B (support surface 32) is the outer peripheral surface of the support portion 31B.
[0043] This feature allows the body support unit 10B (10) to perform a unidirectional swing motion, like a seesaw, combining a horizontal direction HZ and a vertical direction VT, which are set in one direction, with the reference part C as the fulcrum. Therefore, the trainee HM standing on the support surface 11B (11) of the body support unit 10B can control his / her posture (balance) in one direction, such as left / right or front / back, and can perform training to train his / her sense of balance in the direction he / she wants to improve.
[0044] Furthermore, the balance board 1 according to this embodiment is characterized in that the base 30 has an upper surface 35 that regulates the tilt of the body rest 10 placed on the support 31.
[0045] Due to this feature, even when the trainee HM stands on the support surface 11, the body support portion 10 does not tilt excessively more than necessary, and therefore the body support portion 10 can be prevented from falling off the base 30 due to the standing position of the trainee HM on the support surface 11.
[0046] The balance board of the present invention has been described above in accordance with the embodiments, but the balance board of the present invention is not limited to the embodiments and can be modified as appropriate within the scope of the gist of the balance board.
[0047] For example, in Example 1 of the embodiment, a balance board with support parts arranged in a total of six locations was presented, but in the case of support parts formed in a spherical shape, as long as there are three or more support parts, various modifications are possible without being limited to the embodiment.
[0048] In Examples 1 and 2 of the embodiment, as shown in Figs. 5 and 11, the trainee HM performs balance training to improve his sense of balance by placing both feet on the support surface 11 of the body support portion 10 of one set of balance boards 1 (1A, 1B). However, two sets of balance boards according to the present invention can also be used in combination to perform balance training to improve the trainee's sense of balance. Specifically, the trainee performs training to improve his sense of balance by placing one foot on the support surface of the body support portion of one balance board and the other foot on the support surface of the body support portion of the other balance board.
[0049] In addition, in Examples 1 and 2 of the embodiment, the trainee HM stands with both feet on the support surface 11 of the body support portion 10 of the balance board 1 (1A, 1B) to perform balance training to improve his / her sense of balance. Alternatively, the trainee can perform exercises while sitting in a chair placed on the floor, by placing and moving his / her feet on the support surface of the body support portion of the balance board according to the present invention placed on the floor. This allows the balance board according to the present invention to improve the trainee's sense of balance, thereby improving motor function and contributing to resolving lack of exercise.
[0050] Furthermore, when a trainee exercises using the balance board of the present invention while seated in a chair, they can also use a single bar as an auxiliary tool. Specifically, with the bar lying on the support surface of the body support section of the balance board of the present invention, the trainee anchors one foot to one end of the bar and the other foot to the other end of the bar. Then, with the bar abutting the support surface, the trainee, seated in a chair, presses the body support section with both feet via the bar, performing a swinging motion while tilting in all directions 360 degrees around a reference position. [Explanation of symbols]
[0051] 1,1A,1B Balance Board 10 Body rest 11 Placement surface 20 Curved section 21 Curved surface (first curved surface) 30,30A,30B base 31 Support part 31A Support part (spherical support part) 31B Support part (cylindrical support part) 32 Support surface (second curved surface, support surface) 32A Support surface (support surface) 32B Support surface (support surface) 35,35A,35B (Regulatory) C Reference site W load N Resistance, reaction force HM Trainee
Claims
1. A balance board having a plate-shaped body support portion including a support surface that can come into contact with the trainee's body, and a curved portion formed by a first curved surface around a reference position, the curved portion being disposed on the opposite side of the support surface, a base on which the body resting section is placed and supported, the base has a support portion that can come into contact with the curved portion when the body rest portion is placed thereon; the support part has a support surface formed by a second curved surface as a surface that applies a reaction force to a load transmitted from the body rest part via the support part, the reaction force being directed toward the reference part above the body rest part; the body resting unit is placed on the base in a swingable state by the support unit; the support part is held by a holder, the holder is disposed as a single unit independently on an attachment surface of the base that is positioned opposite the curved part, and the body placement part is supported by the base simply by placing the curved part on the support surface of the support part; A balance board featuring:
2. The balance board according to claim 1, the support portion is formed in a spherical shape and is disposed rotatably relative to the base at at least three points around an axis passing through the reference portion, the support surface is a spherical surface of the support part; A balance board featuring:
3. The balance board according to claim 1, the support portion is formed in a cylindrical shape and is disposed on both sides of an axis passing through the reference portion so as to be rotatable relative to the base, the support surface is an outer peripheral surface of the support portion; A balance board featuring:
4. The balance board according to claim 2 or 3, the base has a regulating surface that regulates the tilt of the body resting unit placed on the support unit; A balance board featuring:
Citation Information
Patent Citations
leg waist training machine
JP1995013362U
Health medical appliance
JP2001276276A
Balance board
JP2021133227A