JP4769327B1 - Posture correction device - Google Patents

Abstract

An object of the present invention is to alleviate stress occurring in the sacroiliac joint in daily life and correct posture bias to improve back pain.
A cushion 10 includes a seat 12 that bears a load due to the weight of a seated person 50, and a sacrum pad that hits a sacrum 42 or a tailbone 44 at a position below the body from a line connecting a pair of upper posterior iliac spines. 22 and the seat portion 12, and an iliac pad portion 30 that hits the iliac 46 at a position above the body from a line connecting the pair of upper posterior iliac spines is provided. When the seated person 50 is seated on the seat 12, the sacrum rising moment M1 acts on the sacrum 42 that receives the external force F1 via the tailbone 44. The iliac anteversion moment M2 acts on the iliac 46 that receives the external force F2 from the iliac pad portion 30. The action of these moments M1 and M2 corrects the posture of the pelvis, relieves or eliminates stress on the sacroiliac joint 60, and improves back pain.
[Selection] Figure 3

Description

  The present invention relates to a posture correction device that corrects a bias in posture that occurs in daily life.

  Conventionally, for example, devices disclosed in Patent Documents 1 to 3 are known as devices for reducing or alleviating back pain. These devices have a function for realizing “extending the waist by tilting the pelvis (sacrum) forward”, which has been said to be good for back pain.

JP 2003-284620 A JP 2006-31946 A JP 2009-160195 A

  The pelvis is composed of a sacrum, two hipbones on both sides, and a tailbone. The hipbone consists of the iliac, pubic and ischial bones. The sacrum and the hipbone are connected by a sacroiliac joint between the sacrum and the iliac and the pubic joint. In the inventions disclosed in Patent Documents 1 to 3, the pelvis is considered to move as one lump. For example, Tsutomu Yamazaki, “Theory and Technology of Orthopedic Physical Therapy”, Medical View Co., Ltd., No. 1 In the edition, p.179, “Since the iliac bone is simply tilted forward, the sacrum is not always tilted forward (hereinafter referred to as“ nodding ”), and conversely, the sacrum tilts backward (rises up). In other words, the iliac and the sacrum do not always move in the same direction, such as anteversion of the pelvis, posterior inclination of the sacrum (hereinafter referred to as sacral rise) or vice versa. Rather, the sacrum and iliac have a structure that can be separated and moved by the sacroiliac joint, ”and the importance of grasping the pelvis as separable in considering back pain. Suggests.

  In addition, I.I. A. KAPANDJI, Translated by Hideo Kajishima, Translated by Tomoaki Shimada, “Physiology of the Joint 3 Body and Spinal Column”, Ishiyaku Shuppan Publishing Co., Ltd., 1st Edition, p.64-65, In other words, the sacrum produces a moment in the direction of the sacrum, while the reaction from the ground via the femur produces a moment that causes the iliac to tilt backwards. Is further strengthening the sacral nod. "

  That is, in the standing posture, as shown in FIG. 5, the weight of the body acts on the upper end (cape angle) of the sacrum 100 (indicated by P in the figure, the same applies hereinafter), and the sacrum that tries to tilt the sacrum forward. A nodding moment (N1) is generated. The reaction from the ground is transmitted from the femoral head to the iliac 104 (R), and a moment of iliac retroversion is generated (N2). These moments N1 and N2 are reverse moments generated around the sacroiliac joint 102 because P and R are not collinear. As a result of the sacral nodding moment and the iliac posterior tilting moment acting constantly, enormous stress is generated in the sacroiliac joint, which is the joint of these, and the sacroiliac joint itself and the surrounding ligaments, Soft tissues such as muscles are damaged by stress, which causes blood circulation disorder and eventually causes low back pain.

  Each joint and soft tissue (joint capsule, ligament, muscle, etc.) in the whole body has a structure and arrangement so that the body weight can be well dispersed and active. When this dispersion breaks down and the weight is biased to a part, the mechanical stress becomes excessive. And it follows the flow of tissue failure → blood circulation disorder → pain appearance. It can be said that a good posture is an efficient and stable posture with no bias. A good posture can be said to be a state in which the joint has good compatibility, the soft tissue has flexibility, and no circulatory disturbance has occurred. In other words, if the biased posture can be brought close to the original good posture, it will lead to the acquisition of a painless body that humanity is ideal.

  Based on these considerations, we have learned that if a force difficult to obtain in daily life can be applied to the sacroiliac joint, the bias in the posture is corrected, leading to improvement in back pain. That is, as shown in FIG. 6, a sacral rising moment M1 that is opposite to the sacral nodding moment is generated, and preferably an iliac anteversion moment M2 that is opposite to the iliac backward moment is also generated. The sacroiliac joint is free from stress and can be expected to improve back pain.

In order to solve the above-described problem, the first aspect of the present invention is a sacral rising moment applying means for applying a rising moment around the sacroiliac joint to the sacrum by relatively displacing the position of the sacrum with respect to the iliac. Provided is a posture correction device.
The sacral rising moment is a moment in the opposite direction to the sacral nodding moment that gives a great stress to the sacroiliac joint in daily life, and is a moment that acts in the direction in which the lower sacrum moves from the back of the body to the front of the body. By applying the sacral rising moment, the bias in posture is corrected, and the stress of the sacroiliac joint is alleviated or eliminated.

Furthermore, a greater posture correction effect can be expected by giving the iliac a forward tilting moment that acts in the opposite direction to the backward tilting moment that occurs in daily life.
The sacral rise moment and iliac anteversion moment connected the pair of upper posterior iliac spines and a means to apply external force to the sacrum at a position below the line connecting the pair of upper posterior iliac spines. It can be applied by means for applying an external force to the iliac at a position above the body from the line.
Since the coccyx is connected to the sacrum and the coccyx is closer to the surface of the body, external force may be indirectly applied to the sacrum by applying external force directly to the coccyx.

  According to a second aspect of the present invention, the seat includes a seat that contacts the buttocks of the seated person and a back that contacts the waist, and the seat part bears a load due to the weight of the seated person, An elastic body that is harder than the first elastic body and includes a second elastic body that hits the sacrum or the tailbone at a position below the upper posterior iliac spine, and the back portion is continuous with the first elastic body The posture correction apparatus according to claim 2, further comprising a third elastic body that hits the iliac at a position above the body from a line connecting the pair of upper posterior iliac spines.

  Compared with the first elastic body that bears the weight of the seated person, the harder second elastic body has a relatively small sinking amount, so that it is lower than the line connecting the pair of upper posterior iliac spines. It functions as a means for applying an external force to the sacrum at the position, and also functions as a means for applying a sacral rising moment. The third elastic body is deformed into a anteversion posture as the first elastic body sinks, whereby an external force is applied to the iliac at a position above the body from the line connecting the pair of upper posterior iliac spines. It functions as a means for imparting the iliac bone, and functions as a means for applying an iliac anteversion moment.

  Furthermore, it is preferable that the thickness of the seat portion is thinner at the center than at the front and rear end portions, and the lower ends of the front and rear ends are below the lower end of the center portion. Here, the front and rear ends of the seat portion refer to both end portions when the front side (belly) faces forward when the seated person is seated and the rear side (back) faces rearward.

  In this case, the central part is greatly bent downward by the weight of the seated person, and the back part is further tilted forward in conjunction with this, so that a large external force can be applied to the iliac bone.

  The posture correction device of the present invention reduces the stress generated in the sacroiliac joint in daily life and corrects the bias in posture and improves low back pain by applying a rotational moment around the sacroiliac joint that is difficult to obtain in daily life. be able to.

Perspective view showing the structure of the cushion Side view showing the seated cushion Diagram for explaining the effect of cushioning on lower back pain Illustration for explaining the position of external force applied to the sacrum and iliac bone Skeletal diagram showing the principle of low back pain Skeletal diagram showing movement of sacrum and iliac to improve low back pain

Embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the cushion 10 has a seat-like shape as a whole, and includes a seat portion 12 that extends in the horizontal direction and a back portion 16 that extends vertically upward from the rear end 14 of the seat portion 12. The seat portion 12 has a substantially flat surface and a back surface that is curved so that the approximate center approaches the surface side, the front end 18 and the rear end 14 are thick, and the central portion 20 therebetween is thin. The back portion 16 is separated into two left and right portions at the center in the width direction. The seat portion 12 and the back portion 16 are integrally formed of the same elastic material.

  The sacral pad 22 provided at the center of the seat portion 12 in the width direction is an elongated elastic body extending from the approximate center in the seat surface length direction toward the rear end, and is elastically supported by the seat portion 12. . The sacrum applicator 22 has a width that is the same as or slightly larger than the width of the lower part of the sacrum, and is made of an elastic body that is harder than the material of the elastic body that constitutes the seat portion 12. The front end 24 to the approximate center of the sacrum applicator 22 is exposed on the seat portion 12, and the approximate center to the rear end 26 is sandwiched between the left and right back portions 16. Although it curves upwards from the front end 24 toward the rear end 26, this is in accordance with the shape of the lower part of the sacrum described later. A buffer body 28 made of a softer material is provided on the upper surface of the sacral pad 22. The sacral pad 22 can be attached to and detached from the seat 12 and can be easily exchanged for a desired height, hardness and shape.

  The back portion 16 is curved so as to swell toward the opposite side of the seat portion 12, and an iliac pad portion 30 having a shape protruding toward the seat portion 12 side is provided at the uppermost portion. The iliac pad portion 30 is also integrally formed of the same material as the seat portion 12 and the back portion 16.

  In the configuration of the cushion 10, the seat 12 is a first elastic body that bears a load due to the weight of the seated person, the sacral pad 22 is a second elastic body that hits the sacrum, and the iliac pad 30 is the iliac bone. It functions as a third elastic body that hits. The cushion 10 uses low-resilience foamed polyurethane for the seat 12 and the back 16, and foamed polyethylene is used for the sacral brace 22, but the material of the cushion 10 is not limited to these. .

Next, the usage method of the cushion 10 and the lumbago improvement effect brought about by use will be described.
The cushion 10 is used by being placed on a seat surface 40 of the chair as shown in FIG. Although it is possible to use it by putting it on anything other than this, in order to maximize the function of the cushion 10 as will be described later, the surface is substantially flat without much unevenness and weight is added. Those having a rigidity that does not greatly deform are also preferable.

  When sitting on the cushion 10, the sacrum pad 22 is placed so deep that the iliac pad portion 30 contacts the waist 56 so that the lower part of the sacrum 42 and the tailbone 44 connected under the sacrum 42 are in contact. This is because the sacrum pad 22 and the iliac pad part 30 are in an appropriate position in advance when the seated person 50 is seated in a natural posture, rather than sitting in such a position. It is to adjust. A load due to the weight of the seated person 50 is applied to the seat 12, and the surface of the seat 12 sinks in accordance with the shape of the thigh 54 from the buttocks 52. At this time, the sacrum pad 22 sinks together with the seat 12, but the sacrum pad 22 that is harder than the seat 12 has a relatively small sinking amount, so that the lower part of the sacrum 42 is pushed up relatively. It becomes. As a result, an external force F1 is applied to the sacrum 42 as shown in FIG. 3, and a rising moment M1 around the sacroiliac joint 60 acts.

  The sinking of the seat portion 12 induces a forward tilting of the back portion 16 that follows this, and the iliac pad portion 30 strongly hits the iliac 46. As a result, the external force F2 is applied to the iliac 46. The magnitude of the external force F2 can be adjusted according to the material and shape of the cushion 10. Desirably, the iliac 46 is fixed so that it does not move with the displacement of the sacrum 42, or the size is such that the anteversion moment M2 around the sacroiliac joint 60 acts on the iliac 46. It is. The seat 12 is supported by two fulcrums 70 and 72 on the front end side and the rear end side because the back surface is substantially centered and curved toward the front side. Therefore, when a load due to the weight of the seated person 50 is applied to the seat portion 12, the central portion 20 is greatly bent downward (arrow A) as shown in FIG. In conjunction with this, the back portion 16 is further tilted forward (arrow B), and the external force F2 is increased. In addition, the lower part of the seat part 12 including the two fulcrum points 70 and 72 can also be comprised with a harder material, for example, the same material as the sacrum applicator 22, compared with the upper part which touches the collar part 52 directly. In this way, the rigidity of the cushion 10 can be increased without causing discomfort to the buttocks 52, the deformation of the seat 12 is easily transmitted to the back 16, and the external force F2 is effectively applied by the iliac 46. Become so.

  As described above, the cushion 10 can be applied with the sacral rising moment M1 on the sacrum 42 only by being seated, and can be fixed to the iliac 46 so as not to be tilted backward, or can be applied with the forward tilting moment M2. be able to. Therefore, the use of the cushion 10 causes a moment in the direction opposite to the moment generated around the sacroiliac joint 60 in daily life, particularly in a standing posture, resulting from the phenomenon of sacral nodling and iliac retroversion. The bias of the posture to be corrected is corrected, the stress of the sacroiliac joint 60 is relieved or eliminated, and the back pain is improved.

  The cushion 10 is an aspect of the present invention, and the aspect of the posture correction device of the present invention is not limited to this. For example, the configuration of the posture correction device can be incorporated in the chair itself. In the cushion 10, the sacral rising moment applying means and the iliac anteversion moment applying means are realized by using the elasticity of the cushion 10 itself and the weight of the seated person. It is also possible to configure so as to realize these functions by electrical means or mechanical means. What is particularly important in any of the aspects is that the position of the sacrum 42 is displaced relative to the iliac 46 so that a rising moment acts on the sacrum 42.

  In order to apply the sacral rising moment, as shown in FIG. 4, an external force F1 is applied to the sacrum 42 within the range indicated by the oblique line below the line 80 connecting the left and right upper posterior iliac spines. That's fine. Note that an external force may be indirectly applied to the sacrum 42 by applying an external force to the tailbone 44 connected to the lower side of the sacrum 42. At this time, if the iliac 46 moves in the backward tilting direction, the relative displacement of the sacrum 42 cannot be realized, so that the external force F2 is within the range indicated by the oblique line above the line 80 with respect to the iliac 46. It may be desirable to add When this external force F2 is positively applied and a anteversion moment is applied to the iliac 46, more effective posture correction is possible, leading to further improvement of back pain.

DESCRIPTION OF SYMBOLS 10 Cushion 12 Seat part 16 Back part 22 Sacrum pad 30 iliac pad part 42,100 Sacrum 44 Coccyx 46,104 Iliac 50 Seated person 52 Buttocks 56 Lumbar part 60,102 Sacroiliac joint 80 Left and right upper iliac spine Connecting line

Claims (3)

A seat that contacts the buttocks of the seated person and a back that contacts the waist,
A position where the seat portion is lower than the first elastic body bearing a load due to the weight of the seated person and a line that is harder than the first elastic body and connects a pair of upper posterior iliac spines; Including a second elastic body that hits the sacrum or coccyx,
Said back portion, an elastic body which is continuous with the first elastic body, seen including a third elastic body falls iliac at the position of the body above the line connecting the pair of upper iliac spine,
The second elastic body applies an external force to the sacrum at a position below the body from a line connecting the pair of upper posterior iliac spines, and the third elastic body includes a pair of upper posterior iliac spines. Posture correction by applying an external force to the iliac at a position above the body that connects the sacrum to displace the position of the sacrum relative to the iliac and apply a rising moment around the sacroiliac joint to the sacrum apparatus. The posture correction apparatus according to claim 1 , wherein the second elastic body is elastically supported by the first elastic body. The posture correction device according to claim 1 or 2 , wherein the seat portion is thinner at the center than at the front and rear ends, and the lower ends of the front and rear ends are below the lower end of the center.

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