JP5733713B2 - Shock absorber - Google Patents

Description

  The present invention provides a belt-like support made of a stretchable fabric covering the hip from the waist of the human body, an impact absorbing pad supported by the support, and both ends of the support, to the waist of the support The present invention relates to a winding-type shock absorbing device that includes a holding portion that holds the wound state of the above-mentioned on the abdomen side.

  Many of the elderly fractures are fragile fractures caused by slight external force due to a decrease in bone strength, mainly the femoral neck, spine, humeral neck, distal radius, pelvis, ribs, etc. It becomes a fracture site. And most of them are clinical fractures due to falls, etc., except for vertebral fractures with many asymptomatic vertebral body deformations.

  The femoral neck fracture tends to increase exponentially with age, and is the fracture with the worst life prognosis and functional prognosis among elderly fractures. Resting also weakens healthy upper limbs and unbroken lower limbs and makes it difficult to move and complications such as pneumonia and bedsores are likely to occur.

  Therefore, Patent Document 1 proposes a wound-type fracture prevention device for preventing a fracture of the femur. As shown in FIG. 5, the fracture prevention device 10 includes a waist belt 12 that is wound around the waist, and a shock-absorbing member that is suspended from the waist belt 12 and housed therein when attached to the site corresponding to the femur. A shock absorbing portion 20 that abuts and fixing belts 40a and 40b for bringing the shock absorbing portion 20 into close contact with the human body. The waist belt 12 is wrapped around the waist and fixed at both ends, and the shock is applied by the fixing belts 40a and 40b. The absorber 20 is mounted so as to be in close contact with the human body.

  Further, Patent Document 2 has a problem that the above-described fracture prevention device lacks reliability in holding the shock absorbing part in a desired position for a long time, and the problem that the shock absorbing part interferes with walking. A wound-type protective band for preventing fracture has been proposed.

  As shown in FIG. 6, the protective band for fracture prevention includes a main body 1 that is continuously formed so as to cover a portion from the greater trochanter to the buttocks, and a larger trochanter provided at a position that covers the greater trochanter of the main body 1. It has child pads 8 and 9, a heel pad 13 provided at the rear of the main body 1, and attachment / detachment means 17 and 18 attached to the upper part of the main body 1. The main body 1 has left and right upper anterior iliac spines of the iliac in the circumferential direction. It extends further rearward and covers up to the buttocks, in the vertical direction, covers from the waistline to the thigh groin, and the front surface is open.

  In addition, the code | symbol attached | subjected to FIG.5, 6 uses the code | symbol attached | subjected by the prior art document as it is, and does not respond | correspond with the code | symbol shown by embodiment of this invention mentioned later.

JP 2001-95827 A JP 2003-116896 A

  If an elderly person stays in bed for one week due to some disease, including after treatment of a femoral neck fracture, a great deal of effort will be required before the elderly can move back. Therefore, it is necessary to get out of bed as soon as possible and start rehabilitation such as walking training.

  However, patients with anxiety that if they fall during walking training, etc., may cause similar clinical fractures, they cannot easily and actively start rehabilitation. However, when the instructor always attends the patient, there is a problem that the labor of the instructor becomes great.

  Therefore, when the patient performs rehabilitation, it is conceivable to wear the above-described fracture prevention device or a fracture prevention protective band. These are superior in that they are wound types that are easy to put on and take off as compared to underwear types.

  However, when wearing the above-mentioned fracture prevention device, since the hip pad is not provided, there is a risk that when the patient puts on the buttocks, an impact is applied to the buttocks to induce a spinal vertebral body compression fracture, particularly a lumbar compression fracture. there were.

  In addition, when wearing the above-mentioned protective band for preventing fracture, it is expected that when the patient puts on the buttocks, the impact applied to the buttocks is absorbed by the buttocks pad provided on the main body. Since it is a large single buttock pad arranged along a flat main body that hangs down like an axillary belt from the auxiliary belt, there is no guarantee that it will always be in contact with the heel, and there is a problem that it is easy to drown when worn there were.

  In addition, when the patient's posture changes suddenly from standing to sitting, if the lower end of the buttocks pad comes into contact with the floor surface, the buttocks pad escapes along the buttocks surface, and the patient's sciatic nodule directly touches the floor surface. The possibility of inducing spinal vertebral body compression fractures could not be resolved with certainty.

  In view of the above-described problems, an object of the present invention is to provide an impact-absorbing device that can appropriately avoid a spinal vertebral body compression fracture caused by a rehabilitation of an elderly person or a buttocks that occurs in daily life.

In order to achieve the above-mentioned object, a first characteristic configuration of the shock absorbing device according to the present invention is a belt-like shape made of an elastic fabric covering the hips from the waist of the human body as described in claim 1 of the claims. Support body, an impact absorbing pad supported by the support body, and a holding part that is provided on both right and left ends of the support body and holds the wound state of the support body around the waist on the abdomen side. The shock absorbing pad is supported by a region of the support that covers the sciatic nodule from the coccyx, and is composed of at least a plurality of buttocks pads that divide the region vertically. In addition, the support is provided with a throttle so that the plurality of buttock pads follow the buttock of the human body, and the winding state of the support on the waist is held only by the holding part. It is in.

A belt-like support made of stretchable fabric is wound around the lumbar region of the human body so as to cover the buttocks, and this state is held on the abdomen side only by the holding portion. In this state, the buttock pad supported on the buttock side of the support closely contacts the region covering the sciatic nodule from the tailbone. Even if the buttock is attached, the impact acting on the buttocks is weakened by the buttocks pad that is the shock absorbing pad, and a situation in which an impact that leads to a spinal vertebral body compression fracture is directly applied to the human body is avoided.

  The buttock pad is composed of a plurality of buttock pads that are divided into upper and lower parts, and the plurality of buttock pads are arranged along the buttock of the human body by the narrowed portion provided on the support, so that the posture can be either standing or sitting. Moreover, even if it changes to any posture, it always follows the buttocks. For example, even when changing the posture from the standing position to the sitting position, it easily bends at the boundary of the upper and lower buttocks pads, and each surface stably faces the buttocks, which not only reduces the uncomfortable feeling when wearing, The buttock pad does not deviate from the area covering the sciatic nodule from the coccyx, which is the protective area.

  On the other hand, with a single large buttocks pad, when the posture is changed from the standing position to the sitting position, the buttocks pad does not flex flexibly and the reaction force acting in the deployment direction may cause a sense of incongruity or flatness. Frequent inconveniences occur where the lower end of the buttocks pad abuts against the chair or floor and shifts upward or rises. For this reason, there is a possibility that the same phenomenon occurs even when the buttocks are put on, and the shock applied to the tailbone and the sciatic tuber cannot be absorbed appropriately.

  In the second feature configuration, as described in claim 2, in addition to the first feature configuration described above, an inclined portion having a lower edge gradually inclined toward an upper edge toward the end portion side of the support is provided. The holding portions are connected to both end portions of the support body that are formed narrower than the central portion via the inclined portion, and the upper and lower portions are wound forward by the inclined portion in a state of being wound around the waist portion of the support body. The anterior portion of either the iliac spine or the lower anterior iliac spine is configured to be covered and used to prevent vertebral body compression fractures.

  According to the above-described configuration, the tension acts so that the lower edge side of the support is pulled by the holding part via the inclined part in a state where the support is wound around the waist and is held by the holding part. There is no longer any risk of falling outside the body, and a stable protective posture can be maintained.

  In addition, the pelvis has several protrusions with thigh and trunk muscles, the upper anterior iliac spine adheres to the sewing muscle and the femoral fascia lata, and the lower anterior iliac spine has a straight thigh. Muscles are attached. Sewing muscles flex the hip joint, abduction, external rotation and knee joint flexion / internal rotation, and the femoral fascia lata and rectus femoris are the muscles that flex the hip joint and extend the knee joint. Also become an important muscle for walking. When the front part is covered with the inclined part of the support from the side of the lumbar part, the front part of either the upper anterior iliac spine or the lower anterior iliac spine is covered, and the hip joint is firmly tightened and supported. Even elderly people with weak muscles can easily walk, and a sense of security can be given to the wearer.

  In addition to the first or second feature configuration described above, the third feature configuration is a region that covers the left and right greater trochanters of the support, and includes the buttocks pad A greater trochanter pad is further supported as the shock absorbing pad on both side regions of the support, and the vertical width of both ends of the support body is below the upper edge of the greater trochanter pad from the upper edge of the support body. The end portion of the support is formed so as to be held by the holding portion.

  By providing the greater trochanter pad in the region covering the greater trochanter in the region on both sides of the buttocks pad, it becomes possible to effectively prevent the fracture of the femoral neck due to the impact or the like at the time of the fall. And since the up-down direction width | variety of the edge part of a support body is set to the width | variety extended from the upper edge of a support body to the lower side from the upper edge of a greater trochanter pad, the edge parts of a support body hold | maintain with a holding | maintenance part. In this state, the urging force toward the body surface acts on the greater trochanter pad, and the greater trochanter pad is in close contact with the body. It is possible to effectively avoid rolling up outside the body.

  In the fourth feature configuration, in addition to any one of the first to third feature configurations described above, a predetermined feature is provided between the upper edge of the support and the shock absorbing pad. A gap portion of a size is formed, and a throttle portion is provided in the gap portion to three-dimensionally abut the support on the collar portion.

  When the belt-like support is a flat stretchable fabric, close contact is possible regardless of the unevenness of the body, but the tension changes greatly depending on the site, the feeling of wearing is poor, and the feeling of discomfort with the shock absorbing pad also increases. However, by forming a gap with a predetermined size between the upper edge of the support and the shock absorbing pad, the support is applied three-dimensionally from a relatively small diameter waist to a large diameter buttocks. It can be stably wound with a relatively uniform tension in a contact state, and a good wearing feeling can be obtained. Further, as the posture of the wearer is changed, the gap portion of the support functions as a play area that allows a slight movement of the shock absorbing pad in the vertical direction so that a better wearing feeling can be obtained. Become.

  In the fifth feature configuration, in addition to any one of the first to fourth feature configurations described above, the fifth feature configuration includes two collar pads that are divided vertically. And the vertical width of the upper heel pad is set to be longer than the vertical width of the lower heel pad.

  The curvature of the body surface changes greatly at the groin that connects from the buttock to the thigh, but the vertical width of the lower heel pad is set shorter than the vertical width of the upper heel pad, so the lower heel pad It comes into contact with the part where the curvature changes. Even when the posture is changed from the standing position to the sitting position, the upper buttocks pad and the lower buttocks pad are easily bent, and the lower buttocks pad is positioned between the floor and the body surface. . Therefore, even in the case where the hips are attached, the upper hip pad mainly protects the coccyx and the lower hip pad mainly protects the sciatic nodule without the hip pad running away along the body surface. Become so.

  As described above, according to the present invention, it is possible to provide an impact absorbing device capable of appropriately avoiding a spinal vertebral body compression fracture caused by a rehabilitation of an elderly person or a buttocks generated in daily life.

A perspective view of a shock absorbing device according to the present invention. Explanatory drawing of parts of shock absorbing equipment according to the present invention It is explanatory drawing of the mounting state of the shock absorbing device by this invention, (a) is explanatory drawing of front view, (b) is explanatory drawing of left side view, (c) is explanatory drawing of back view It is explanatory drawing which shows the relative position of the impact-absorbing pad with which the shock-absorbing apparatus by this invention was equipped, and the skeleton near the pelvis, (a) is explanatory drawing of front view, (b) is explanatory drawing of back view. Illustration of a conventional fracture prevention device Illustration of conventional protective band for fracture prevention

  Hereinafter, a winding type shock absorbing device according to the present invention will be described. Shock absorbers are mainly worn by the elderly and absorb the shock applied to the human body when performing rehabilitation or falling down or falling down in daily life, mainly to prevent spinal vertebral body compression fractures Used for.

  As shown in FIG. 1, the shock absorbing device 1 includes a belt-like support 2 made of an elastic fabric that covers the hips from the waist of the human body, and a reinforcing belt 3 having elasticity sewn on the upper edge 2 c of the support 2. And a plurality of shock absorbing pads P supported by the support 2 and a holding part 4 provided at both ends 2a and 2b of the support 2 to hold the wound state of the support 2 around the waist on the abdomen side, It has.

  The shock absorbing pad P is supported by a region of the support 2 that covers the sciatic nodule from the coccyx. The upper buttocks pad 5 and the lower buttocks pad 6 that divide the region up and down, and the left and right of the support 2 The greater trochanter pads 7 and 8 supported on both sides of the upper buttocks pad 5 are included. Each impact absorbing pad P is covered with the support body 2 with the same stretchable fabric as the support body 2 and sewn so as to be sandwiched, but the shock absorption pad P is shock-absorbed in a pocket provided with an opening formed in the support body 2. You may comprise so that the pad P may be accommodated so that insertion / detachment is possible.

  Of the two hook pads 5 and 6 divided vertically, the upper hook pad 5 is set so that the vertical width of the upper hook pad 5 is longer than the vertical width of the lower hook pad 6. Note that the buttock pad is not limited to being divided into two parts vertically, but may be divided more than that, but the upper and lower width of the upper buttock pad is set to be longer than the vertical width of the lower buttock pad. It is preferable that

  The elastic fabric constituting the support 2 can suitably employ an elastic yarn blend knitted fabric such as a power net from the viewpoint of strength, back stretchability, breathability, etc., and the support 2 uses a warp knitting machine. It can be formed from a single fabric using a three-dimensional knitted fabric, or parts formed of flat warp knitted fabric cut to an appropriate size can be joined together by sewing or bonding. In order to improve the touch, it is also possible to use a pile fabric that exhibits stretchability. There is no limitation on the material and manufacturing method as long as it is a stretchable fabric.

  FIG. 2 shows parts constituting the shock absorbing device 1. The left and right holding parts are composed of the back support part 25 located on the back of the human body and the side support parts 26 and 27 located on the front side from the left and right side surfaces, and the reinforcing belt 3 and the hook-and-loop fastener are sewn. The shock absorbing device 1 is composed of the four parts.

  The back support portion 25 supports the heel pads 5 and 6, and the side support portions 26 and 27 support the greater trochanter pads 7 and 8. Of the side surface support portions 26 and 27, the upper and lower positions of the sewn portion with the back surface support portion 25 are provided with cut portions d 1 and d 2 that are cut obliquely, and the upper portion of the back surface support portion 25 is cut obliquely. d3.

  The darts are formed by sewing the side support parts 26 and 27 on both sides of the back support part 25, and a rounded three-dimensional shape is obtained from the waist to the buttocks. A later-described throttle part 23 is formed by the darts of the sewing part of the cutting part d1 and the cutting part d3, and a later-described throttle part 21 is formed by the darts of the sewing part between the cutting part d2 and the lower portions of the side support parts 26 and 27. Has been.

  The shock absorbing pad P has a suitable size and thickness using a material such as a gel-like material such as silicone gel, a low-rebound foam material such as open cell foam made of polyurethane resin, and an ultra-low hardness rubber material. Is formed.

  Fractures caused by falls of elderly people are caused by a decrease in bone strength with aging, but the impact may be alleviated by the ability to attenuate external forces due to the soft tissue of the bones. Absent. For example, the soft tissue of the greater trochanter is said to absorb up to 75% of the external force. The shock absorbing pad P is for avoiding the fracture by supporting the external force damping ability by the soft tissue of the bone.

  For example, the impact load when a woman weighing 50 kg falls from a walking state is about 640 kgf. According to the paper "Preventive effect of femoral neck fracture and hip protector" by Hiroyasu Okuizumi et al., Geriatric Medicine 34 (12) 1668-1670, 1999, the fracture strength for prevention is estimated to be around 240 kgf. A material having an impact absorption rate of about 70% of the impact load may be selected.

  In this embodiment, a low-resilience foam material is used, the upper buttock pad 5 is 250 mm wide × 150 mm long, the lower heel pad 6 is 250 mm wide × 80 mm long, and the greater trochanter pads 7 and 8 are 150 mm wide × 150 mm long. The thickness is set in the range of 10 mm to 20 mm. The size of each pad is not limited to this, and may be set as appropriate according to the body shape of the user.

  The left and right holding portions 4 connected to both end portions 2a and 2b of the support 2 have a plurality of fine hook-shaped projections arranged on one surface and a plurality of fine projections arranged on the other surface facing each other. A hook-and-loop fastener is provided as a fastener when the rings engage and disengage from each other. The specific structure of the hook-and-loop fastener is not particularly limited, and various forms such as a granular protrusion and a mushroom-shaped protrusion can be selected in addition to the hook-shaped protrusion.

  By winding the support 2 from the waist to the buttocks and superimposing the hook-and-loop fasteners on the abdomen side, the state of covering the buttocks from the waist of the human body is maintained.

  FIG. 3 shows a state in which the shock absorbing device 1 is attached to a human body, FIG. 3 (a) shows a front view, FIG. 3 (b) shows a side view, and FIG. 3 (c) shows a side view. Shows the state of rear view.

  As shown in FIG. 3 (a), an inclined portion 20 in which the lower edge 2d is gradually inclined toward the upper edge 2c toward the end portion of the support 2 is provided, and the width is narrower than the central portion via the inclined portion 20. A holding portion 4 is connected to both end portions 2a and 2b formed in the above. When the support 2 is wound around the lumbar region, the front portion of either the upper anterior iliac spine or the lower anterior iliac spine is covered with the inclined portion 20. Preferably, the front part of the upper anterior iliac spine and the lower anterior iliac spine are covered.

  As shown in FIG. 3 (b), both end portions 2a, 2b of the support body 2 are formed with a vertical width W extending from the upper edge 2c to the lower side of the upper edges 7c, 8c of the greater trochanter pads 7, 8; The ends 2a and 2b of the support 2 are held by the holding portion 4 having the same vertical width W.

  As shown in FIG. 3 (c), a throttle portion 21 is provided on the support 2 so that the plurality of heel pads 5, 6 are along the buttock of the human body. In addition, a gap 22 having a predetermined size is formed between the upper edge 2c of the support 2 and the shock absorbing pads 5, 7, and 8, and the diaphragm 22 is configured to three-dimensionally contact the support 2 with the flange in the gap 22 A portion 23 is provided.

  When the support body 2 is a flat stretchable fabric, it can be in close contact with the body surface regardless of the unevenness of the body, but the tension changes greatly depending on the part, so that the feeling of wearing is poor and the feeling of discomfort with the shock absorbing pad also increases. However, by forming a gap portion 22 having a predetermined size between the upper edge 2c of the support body 2 and the shock absorbing pad, the support body is supported from a relatively small diameter waist portion to a large diameter buttocks portion. While realizing a state of three-dimensional contact along the body surface, it can be stably wound with a relatively uniform tension, and a good wearing feeling can be obtained. Further, along with the change of the posture of the wearer, the gap portion 22 of the support 2 functions as a play area that allows some movement of the shock absorbing pad in the vertical direction, and a better wearing feeling can be obtained. It becomes like this.

  4 (a) shows the relative position between the skeleton near the wearer's pelvis and the shock absorbing pad provided in the shock absorbing device 1 in front view, and FIG. 4 (b) shows the wearer in rear view. The relative positions of the skeleton near the pelvis and the shock absorbing pad provided in the shock absorbing device 1 are shown.

  As shown in FIG. 4 (a), the greater trochanter 10 is hooked back and forth from the side of the greater trochanter 10 with the shock absorbing device 1 mounted on the human body so that the reinforcing belt 3 is positioned around the upper edge of the iliac bone 11. Area is covered with greater trochanter pads 7 and 8. The shock applied to the greater trochanter 10 due to a fall or the like is absorbed by the greater trochanter pads 7 and 8, thereby avoiding the fracture of the femoral neck.

  Since tension acts so that the lower edge side 2d of the support body 2 is pulled by the holding portion 4 via the inclined portion 20, the greater trochanter pads 7 and 8 and the buttocks pad are not swung up outside the body. , Can maintain a stable protective posture.

  Further, since the front part of the upper anterior iliac spine 12 and the lower anterior iliac spine 13 is covered by the inclined portion 20, the hip joint is firmly clamped and supported and attached to the upper anterior iliac spine 12. Elderly people with weakened muscle strength, coupled with the fact that the rectus femoris, the femoral fascia lata, and the rectus femoris attached to the lower anterior iliac spine 13 are supported by the support 2 including the inclined portion 20 Even so, it becomes easier to walk and a sense of security can be given to the wearer.

  Further, the vertical width of the end portion of the support 2 (see W in FIG. 3B) extends from the upper edge 2c of the support 2 to the lower side from the upper edges of the greater trochanter pads 7 and 8. Since the end portions of the support body 2 are held by the holding portion 4, the urging force directed toward the body surface acts on the greater trochanter pads 7, 8 and the greater trochanter pads 7, 8 are Since it is in close contact with the body, it is possible to effectively avoid the displacement of the greater trochanter pads 7 and 8 and the rising to the outside of the body not only when walking but also when falling.

  As shown in FIG. 4 (b), the vertical region covering the sciatic nodule 15 from the tail bone 14 and the horizontal region extending from the sciatic bone to the iliac bone are covered with the buttock pads 5 and 6. The two upper and lower rib pads 5 and 6 are arranged along the flange by the narrowed portion 21 provided on the support body 2, and can be changed to any posture in the standing position or the sitting position. Even if you do it, it always follows the buttocks.

  The vertical width of the lower buttocks pad 6 is set to be shorter than the vertical width of the upper buttocks pad 5 and the lower buttocks pad 6 abuts around the buttocks that connect the thigh to the thigh where the curvature of the body surface changes greatly. Even when the posture is changed from the standing position to the sitting position or when the hips are put on, the upper heel pad and the lower heel pad are easily bent, and the lower heel pad is in contact with the floor along the body surface. Come to be in between. That is, the buttocks pad 6 is disposed so as to cover the sciatic nodule 15 from the floor surface side in the sitting position.

  Therefore, the upper hip pad 5 mainly protects the tailbone 14 and the lower hip pad 6 mainly protects the sciatic nodule 15 without escaping along the body surface. The compression fracture of the vertebral body, particularly the lumbar spine, can be effectively prevented.

  The shock-absorbing device 1 according to the present invention having two pieces of hook pads separated into an upper hook pad 5 and a lower hook pad 6, and a single hook that integrates the upper hook pad 5 and the lower hook pad 6. As a result of dozens of subjects trying on each of the comparative shock absorbing devices equipped with pads and performing sensory tests such as comfort, wearing feeling, ease of movement such as walking, standing and sitting positions The results show that the shock absorbing device 1 according to the present invention is better than the comparative shock absorbing device in terms of the ease of posture change between the two.

  The wound-type shock absorbing device according to the present invention avoids clinical fractures of the spinal vertebral body and femoral neck that may occur due to falls of the buttocks, etc. in rehabilitation and daily life of the elderly regardless of gender. Used for.

1: Shock absorbing device 2: Support portion 2a: Support portion end 2b: Support portion end 2c: Support portion upper edge 2d: Support portion lower edge 3: Reinforcing belt 4: Holding portion 5, P: Upward Buttock pad (shock absorbing pad)
6, P: Lower buttocks pad (shock absorbing pad)
7, 8, P: Greater trochanter pad (shock absorbing pad)
20: Inclined parts 21, 23: Restricted part (dart)
22: Gap

Claims (5)

A belt-like support made of elastic fabric covering the hips from the waist of the human body, a shock absorbing pad supported by the support, and provided on the left and right ends of the support, and wound around the waist of the support A wrapping-type shock absorbing device having a holding portion for holding the state on the abdomen side,
The shock absorbing pad is supported by a region of the support that covers the sciatic nodule from the coccyx, and includes at least a plurality of buttock pads that divide the region into upper and lower portions, and the plurality of buttock pads extend along the buttock of the human body. As described above, the shock absorbing device is configured such that the support is provided with a throttle portion, and the winding state of the support on the waist is held only by the holding portion .   An inclined portion whose lower edge is gradually inclined toward the upper edge toward the end side of the support is provided, and the holding portion is provided at both ends of the support formed narrower than the central portion via the inclined portion. Is connected to the lumbar region of the support, and the inclined portion covers the front part of either the upper anterior iliac spine or the lower anterior iliac spine. The shock absorbing device according to claim 1, which is used for preventing a vertebral body compression fracture. A region that covers the left and right greater trochanters of the support, wherein the greater trochanter pad is further supported as the shock absorbing pad on both sides of the buttocks pad,
The vertical width of both ends of the support is formed to extend from the upper edge of the support to the lower side of the upper edge of the greater trochanter pad, and the ends of the support can be held by the holding part The shock absorbing device according to claim 1 or 2, wherein   2. A gap of a predetermined size is formed between the upper edge of the support and the shock absorbing pad, and a constriction part is provided in the gap to bring the support into three-dimensional contact with the collar. 4. The shock absorbing device according to any one of items 1 to 3.   The said buttock pad is comprised by the two buttock pads divided | segmented up and down, The upper and lower width of the upper buttock pad is set so that it may become longer than the vertical width of a lower buttock pad. The shock absorbing device according to crab.

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