JP6678947B2 - Air mattress and air cell - Google Patents

Description

  The present invention relates to an air mattress and an air cell for preventing bedsores (decubitus).

  Prevention of bedsores (decubitus) is very important for a person who is bedridden or has a difficulty in moving the body due to illness, injury, aging, or the like. Bed sores are often local skin pressure ulcers that result from ischemia due to continued compression of localized skin tissue, such as bone protrusions that receive weight.

  There are two types of air mattresses for preventing bedsores, which are used by stacking them on a normal mattress (also called an overlay type) and types which are used by replacing a normal mattress (also called a replacement type). In an air mattress for preventing bedsores, the air pressure in each air cell is usually maintained at a low pressure so that the user's body sinks, thereby reducing the contact pressure to the body and preventing bedsores.

  As a technique related to an air mattress for preventing bedsores, for example, Patent Document 1 discloses an air mat device in which air is enclosed in an air cell formed in an elongated bag shape and a plurality of air mat devices are arranged side by side in a direction orthogonal to the longitudinal direction of the bed. It is disclosed. Further, Patent Document 2 discloses an air matting device in which a plurality of bag-shaped air cells are arranged in parallel along the longitudinal direction of the bed.

  In the field of bed frames on which mattresses are placed, the "back raising function" that raises the head-side area of the bed bottom and the bed of the knees to prevent the body from sliding down when the back is raised. Some models are equipped with a "knee lift function" that allows the bottom to rise in a mountain shape. In addition, such a model is classified as a "special bed" to which long-term care insurance is applied.

JP 2002-238706 A JP 2002-126013 A

  Bed sores mainly occur in areas where body pressure is concentrated. Therefore, conventionally, from the viewpoint of preventing bedsores, it has been recommended to limit the angle of raising the back to 30 degrees or less in order to minimize the downward shift of the body and the pressure on the sacrum. The Japan Society for Pressure Ulcers <http://www.jspu.org/jpn/journal/yougo3.html#30>). This is also called the 30 degree rule. On the other hand, in recent years, from the viewpoints of rehabilitation in the acute phase, physical condition management of blood pressure, etc., and prevention of aspiration, it is recommended that the patient's back is not limited to 30 degrees, but that he / she is actively raised.

  In this regard, regarding the bed frame, there is a special bed that does not limit the angle of raising the back to 30 degrees or less and actively supports raising the back. However, as for the air mattress, at present, no product for such a special bed is commercially available. That is, a conventional type air mattress that maintains the internal pressure at a low pressure is used even for a bed frame that supports positive back raising.

  When the conventional air mattress whose internal pressure is kept low is used and the back is raised more than 30 degrees, the weight of the upper body is concentrated near the buttocks, and the surface of the air mattress is extremely depressed and the air mattress is depressed. There is a possibility that so-called bottoming, which reaches the bottom of the sheet, may occur. Bottoming is a state in which the user's body is hitting the hard floor surface of the bed frame through a thin sheet of an air mattress, so the bed sore prevention function is lost, which is preferable from the viewpoint of user safety. Absent.

  In order to prevent bottoming, it is possible to make the thickness of the air mattress sufficiently thick. However, in this case, when a part of the body sinks extremely into the air mattress due to raising the back or the like, the state in which the part of the body is suspended by the sheet on the surface of the air cell is brought about. This state is also referred to as a hammock phenomenon, and the contact pressure on the body part is increased, which makes it easier to cause a bedsore.

  The present invention has been made in view of the above, and an object of the present invention is to provide an air mattress and an air cell capable of preventing bottoming and hammock phenomenon even when the back is raised.

  In order to solve the above problems, an air mattress according to one embodiment of the present invention is an air mattress in which a plurality of air cells are arranged, and the plurality of air cells expand in a tubular shape by enclosing air inside. The four cells each include a laminated air cell that is an air cell connected to each other in a region on one axis parallel to the longitudinal direction of the cell, and is located at least from the substantially central portion in the longitudinal direction of the air mattress to the leg side. In the lower body region that is a region to be, in the buttocks and thigh regions that are regions in contact with the boundary between the lower body region and the upper body region that is a region located on the head side from the central portion, a plurality of the laminated air cells are The laminated air cells are arranged so that the longitudinal direction thereof is parallel to the longitudinal direction of the air mattress.

  In the above air mattress, the laminated air cell includes a first bag body made of a sheet material made of a flexible resin material and a second bag body made of a sheet material made of a flexible resin material. A bag body, the first bag body being overlapped with the first bag body by a welding portion provided in a region on one axis parallel to the longitudinal direction of the first and second bag bodies. An integrated second bag body, wherein the four cells have two regions generated by separating the first bag body by the welding portion, and the second cell by the welding portion. It may be formed by two regions generated by separating the bag body.

  In the above air mattress, the welded portion may be provided at a substantially central portion in the lateral direction of the first and second bags.

  In each of the laminated air cells arranged in the buttocks and thigh regions of the air mattress, the air flow may be blocked between the first bag and the second bag. .

  In the air mattress, at least one air cell is provided in a waist region, which is a region near a boundary between the lower body region and the upper body region, in the upper body region, and the longitudinal direction of the at least one air cell is the longitudinal direction of the air mattress. It may be arranged so as to be orthogonal to the direction.

  In the air mattress, the laminated air cell is arranged in a region of the upper body region, which is adjacent to the waist region on the head side, such that the longitudinal direction of the laminated air cell is parallel to the longitudinal direction of the air mattress. It may be done.

  In the air mattress, at least one air cell is provided in a region of the lower body region that is in contact with the buttocks and thigh regions on the leg side, and the longitudinal direction of the at least one air cell is the longitudinal direction of the air mattress. They may be arranged so as to be orthogonal to each other.

  An air cell according to another aspect of the present invention includes four cells that expand in a tubular shape by enclosing air therein, and the four cells are connected to each other in a region on one axis parallel to the longitudinal direction. It is what

  According to the present invention, the laminated air cell is arranged in a region where the weight of the user is likely to concentrate when raising the back so that the laminated air cell is parallel to the longitudinal direction of the air mattress, that is, along the direction in which the user's body extends. Since they are arranged in the same manner, it is possible to disperse the load concentratedly received from the user's body when raising the back in the longitudinal direction of the laminated air cell. Moreover, since the laminated air cell has a structure in which four cells are connected to each other in a region on one axis parallel to the longitudinal direction, the concavo-convex formed by the cells on the top surface side may affect the user's body. It can be supported so as to wrap it in a large area. That is, the contact pressure to the body can be reduced without lowering the internal pressure of the air cell so that the body sinks. Therefore, even when the back is raised, it is possible to prevent bottoming and hammock phenomenon in the air mattress.

It is a top view which shows the air mattress which concerns on the 1st Embodiment of this invention. It is a side view of the air mattress shown in FIG. It is a side view which shows the state which raised the back of the air mattress shown in FIG. It is a perspective view of the laminated air cell shown in FIG. FIG. 5 is a reduced bottom view of the air cell shown in FIG. 4. It is an AA expanded sectional view of FIG. It is sectional drawing which shows the state which exhausted the air from the air cell shown in FIG. It is a schematic diagram for demonstrating the principle of body pressure dispersion | distribution in the air cell shown in FIG. It is a top view which shows the air mattress which concerns on the 2nd Embodiment of this invention. It is a BB sectional view of FIG. It is a partially expanded sectional view which shows the internal structure of the air cushion shown in FIG. It is a top view which shows the air mattress which concerns on the 3rd Embodiment of this invention. It is CC sectional drawing of FIG.

  Hereinafter, an air mattress and an air cell according to an embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. In the description of each drawing, the same parts are denoted by the same reference numerals. The drawings referred to in the following description only schematically show the shapes, sizes, ratios, and positional relationships so that the content of the present invention can be understood. That is, the present invention is not limited to the shapes, sizes, ratios, and positional relationships illustrated in each drawing.

(First embodiment)
FIG. 1 is a top view showing an air mattress according to the first embodiment of the present invention. FIG. 2 is a side view of the air mattress. FIG. 3 is a side view showing a state in which the back of the mattress is raised. As shown in FIG. 1, the air mattress 1 according to the present embodiment is an air mattress in which a plurality of air cells are arranged. In this embodiment, the air mattress 1 is composed of two types of air cells (laminated air cells 10 and 20).

  As shown in FIG. 2, in the present embodiment, the thickness H1 of the air mattress 1 is approximately 75 mm to 80 mm. Such an air mattress 1 can be used as an overlay mattress which is laid on a general mattress for use. FIG. 3 shows a state in which a general mattress 2 is laid on the bed bottom 3 and the air mattress 1 according to the present embodiment is laid on it. The air mattress 1 may be laid directly on the bed bottom and used alone.

  The configuration of the bed to which the air mattress 1 can be applied is not particularly limited, but in the present embodiment, as an example, a case where the air mattress 1 is applied to a special bed having a back raising function and a knee raising function will be described. The bed bottom of the special bed is divided with a substantially central portion in the longitudinal direction of the bed as a boundary, and has a structure in which the bottom on the head side stands up. Further, the leg-side bottom is further divided approximately in the central portion, and has a structure in which the knee portion rises in a mountain shape.

  The bed bottom 3 illustrated in FIG. 3 has four regions, from the head side, a back bottom 31, a waist bottom 32, a leg bottom 33, and a lower leg bottom 34. Each bottom is a plate-shaped member and may be partially meshed for ventilation. The boundary between the waist bottom 32 and the leg bottom 33 is located substantially in the center of the bed bottom 3 in the longitudinal direction, and when raising the back, the back bottom 31 which is the head side region with this boundary as an axis. And the waist bottom 32 is launched. The waist bottom 32 illustrated in FIG. 3 is divided into a finer plate shape than the other bottoms (8 plates in FIG. 3), and the back bottom 31 is curved so that it rises gently when the back bottom 31 is raised. Follow up and stand up. Further, when raising the knee, the vicinity of the boundary between the leg bottom 33 and the lower leg bottom 34 is raised.

  In the following, the region on the lower leg bottom 34 side from the substantially central portion in the longitudinal direction of the air mattress 1 is called the lower body region, and the region on the back bottom 31 side is called the upper body region.

  In the end region of the air mattress 1 on the back bottom 31 side, a plurality (four in FIG. 1) of laminated air cells 20 are arranged so as to be orthogonal to the longitudinal direction of the air mattress 1. Hereinafter, the end region on the back bottom 31 side (the region where the laminated air cell 20 is arranged) is referred to as the head region. The head region is usually a region on which the user's head to neck is placed.

  A plurality of (11 in FIG. 1) laminated air cells 10 are arranged in parallel to the longitudinal direction of the air mattress 1 in a region following the head region (a region between a waist region described below). Hereinafter, the upper body region (the region where the laminated air cell 10 is arranged) adjacent to the head region is referred to as the upper body region. The upper torso region is usually a region on which the upper torso of the user, such as a shoulder or a back, is placed. The head region and the upper body region of the air mattress 1 are placed on the back bottom 31.

A plurality of (three in FIG. 1) laminated air cells 20 are arranged in the upper body region (region near the boundary with the lower body region) following the upper body region so as to be orthogonal to the longitudinal direction of the air mattress 1. . Hereinafter, the region near the boundary between the lower body region and the upper body region is referred to as a waist region. The waist region is usually a region on which the user's waist is placed. The waist region of the air mattress 1 is placed on the waist bottom 32.
The body part extending from the upper torso to the buttocks is also called the trunk.

  A plurality of (11 in FIG. 1) laminated air cells 10 are provided in the longitudinal direction of the air mattress 1 in a region of the lower body region that is closer to the head than the central portion (region that contacts the boundary with the upper body region). They are arranged in parallel. Hereinafter, of the lower body region, a region in contact with the boundary with the upper body region is referred to as a hip and thigh region or a hip / thigh region. The buttock / thigh region is usually a region on which the user's buttock / thigh is placed. The buttock / thigh region of the air mattress 1 is placed on the leg bottom 33.

  A plurality of (11 in FIG. 1) laminated air cells 10 are arranged parallel to the longitudinal direction of the air mattress 1 in a region of the lower body region that is closer to the upper body than the central portion. In the lower body region, one or more (one in FIG. 1) laminated air cells 20 are arranged in an end region on the side opposite to the upper body side so as to be orthogonal to the longitudinal direction of the air mattress 1. ing. Hereinafter, the region of the lower body region that is closer to the end than the substantially central portion is referred to as the lower leg / heel region. The lower leg / heel region is usually a region on which a portion below the user's knee is placed. The lower leg / heel region of the air mattress 1 is placed on the lower leg bottom 34.

  A plurality of laminated air cells 20 are arranged so as to be orthogonal to the longitudinal direction of the air mattress 1 in the vicinity of the substantially central portion of the lower body region, that is, in the region between the buttocks / thigh region and the lower leg / heel region. ing. Hereinafter, the region near the substantially central portion of the lower body region is referred to as the knee region. The knee area is usually an area on which the back of the user's knees rests when the knee is raised. The knee area of the air mattress 1 is placed so as to straddle the boundary between the leg bottom 33 and the lower leg bottom 34.

  FIG. 4 is a perspective view of the laminated air cell 10. FIG. 5 is a reduced bottom view of the laminated air cell 10 shown in FIG. FIG. 6 is an AA enlarged cross-sectional view of FIG. FIG. 7 is a cross-sectional view showing a state in which air is exhausted from the laminated air cell 10 shown in FIG.

  The laminated air cell 10 has a size in which the length in the longitudinal direction is approximately 360 mm to 400 mm, and the width W1 (length in the lateral direction) and the thickness H1 are approximately 75 mm to 80 mm. However, the size of the laminated air cell 10 may be appropriately adjusted depending on the size of the entire air mattress 1, the positions and the number of the laminated air cells 10 arranged in the air mattress 1, and the like.

  The laminated air cell 10 is an air cell in which four cells 111, 112, 121, 122 that expand in a tubular shape by enclosing air inside are connected to each other in a region on one axis parallel to the longitudinal direction of the cells. is there. Here, the “region on one axis” in the present application may be a region having a certain width or thickness. Further, the “region on one axis” does not necessarily have to be continuous, and a part may be interrupted as long as it is on one axis.

  Specifically, the laminated air cell 10 has two bags 11 and 12 formed of a sheet material made of a flexible resin material. These bag bodies 11 and 12 are laminated and integrated by a welding portion 13 which is in a line shape parallel to the longitudinal direction of the bag bodies 11 and 12. The two regions produced by separating the bag body 11 by the welding portion 13 are cells 111 and 112, and the two regions produced by separating the bag body 12 by the welding portion 13 are cells 121, 122. Since the welded portion 13 is provided at a substantially central portion of the bags 11 and 13 in the lateral direction, the diameters of the cells 111, 112, 121 and 122 in the expanded state are substantially equal to each other.

  In FIG. 5, the welded portion 13 is provided in one continuous band-shaped region, but the welded portion 13 may be provided in a plurality of locations as long as the regions are on the same axis.

  As shown in FIG. 6, when the laminated air cell 10 is filled with air, the four cells 111, 112, 121, 122 swell and come into contact with the adjacent cells in a planar manner. However, these cells 111, 112, 121, 122 are merely connected to each other at the welded portion 13 provided on one axis of the central portion of the cross section of the laminated air cell 10. That is, the cells 111, 112, 121, 122 are not connected in a plane with the adjacent cells, and are in a movable state with the welded portion 13 as a rotation axis.

  Gap regions 113 are provided between the welded portions 13 and both ends of the bag body 11 in the longitudinal direction. This gap region 113 allows air to flow between the cells 111 and 112. As a result, even when a load is applied to the laminated air cell 10, the internal pressures of the cells 111 and 112 become substantially equal. The structure of the bag body 12 is the same as that of the bag body 11 as a whole, and air can flow between the cells 121 and 122.

  The flow state of air between the bag body 11 and the bag body 12 may be changed depending on the place where the laminated air cell 10 is arranged. For example, since a large load is applied to the laminated air cell 10 arranged in the buttocks / thigh region when the bed is raised back, in order to reliably prevent bottoming, the space between the bag body 11 and the bag body 12 is prevented. It is better to shut off the air at. In this case, in the bag body 12 on the top surface side (the surface side of the air mattress 1), by keeping the internal pressure relatively low, the user's body is slightly depressed in the cells 121, 122, and wrapped in the cells 121, 122. To support the body. On the other hand, the bag body 11 on the bottom surface side (bottom surface side of the air mattress 1) is filled with air having a sufficient internal pressure to prevent sinking due to a load, and the truss structure described later disperses the body pressure.

  Further, in the laminated air cell 10 arranged in the upper body region, air may be blocked between the bags 11 and 12, but this is not essential. When shutting off the air, the internal pressures of the bags 11 and 12 make the internal pressure on the top surface side relatively low and the internal pressure on the bottom surface side relatively high, as in the buttocks / thigh regions.

  In the laminated air cell 10 arranged in the lower leg / heel region, the air may be blocked between the bag body 11 and the bag body 12, or the air may be circulated. In the latter case, since the air supply port to the laminated air cell 10 is only required at one place, the structure can be simplified.

  As shown in FIG. 5, the bag body 11 on the bottom surface side is provided with an air supply port 114, and by injecting air from an air supply passage 115 connected to the air supply port 114, the bag body 11 is supplied. Filled with air. When air is shut off between the bag body 11 and the bag body 12, the bag body 12 is also provided with an air supply port.

  In addition, one or both of the bags 11 and 12 may be provided with hooks, buttons, or the like for connecting the laminated air cells 10 to each other or connecting the laminated air cell 10 to another air cell.

  When such a laminated air cell 10 is filled with air, the cells 111, 112, 121, 122 expand and come into contact with adjacent cells in a planar manner, and the cells 111, 112 on the bottom surface side contact through the contact surface. A structure (truss structure) that supports the cells 121 and 122 on the top surface side is formed, and the body pressure can be dispersed.

  FIG. 8 is a schematic diagram for explaining the principle of body pressure dispersion in the laminated air cell 10. When the load P1 is applied to the cells 121 and 122 by putting the body on the laminated air cell 10, the load P1 is dispersed in the direction of the two cells 111 and 112 (see loads P2 and P3). In other words, the reaction force received from the cells 111 and 112 on the bottom surface side supports the body placed on the cells 121 and 122 from a plurality of directions. Thereby, the body pressure is dispersed and the bed sore preventing effect can be enhanced.

  The method for manufacturing the laminated air cell 10 is not particularly limited. As an example, as shown in FIG. 7, two bags 11 and 12 formed of a flexible resin material (urethane or the like) are overlapped, and a substantially central portion of the bags 11 and 12 in the lateral direction is elongated. Weld in a line parallel to the direction. The welding method is not particularly limited as long as the bags 11 and 12 can be partially welded. For example, heat welding in which the bags 11 and 12 are sandwiched between heated dies may be performed, or high frequency welding may be performed. Preferably, pin welding may be performed. In this case, the width of the welded portion can be easily reduced. Note that an opening or the like for attaching the air supply port may be formed in advance. Further, both ends in the longitudinal direction of the bags 11 and 12 may be closed in advance, or may be closed after the welding of the welding portion 13.

  When the bags 11 and 12 are overlapped and welded in this way, it is possible to complete the work of separating the internal spaces of the bags 11 and 12 and the work of connecting the bags 11 and 12 to each other at once. There are advantages.

  Referring again to FIGS. 1 to 3, the laminated air cell 20 has a size in which the length in the longitudinal direction is approximately 800 mm to 900 mm, and the length and the thickness in the lateral direction are approximately 75 mm to 80 mm. The size of the laminated air cell 20 may be appropriately adjusted depending on the size of the entire air mattress 1, the position and the number of the laminated air cells 20 arranged in the air mattress 1, and the like.

  The structure of the laminated air cell 20 is the same as the structure of the laminated air cell 10 described above (see FIGS. 4 to 7), and only the length in the longitudinal direction is different. Regarding the flow state of the air between the two bags constituting the laminated air cell 20, the air may be circulated or the air may be blocked depending on the arrangement of the laminated air cell 20.

  Next, the flow state of the air between the adjacent air cells in the air mattress 1 will be described. In the plurality of laminated air cells 10 arranged in the buttocks / thigh regions, it is preferable to block the flow of air between the cells 121 and 122 (bags 12) on the top surface side. This is because the internal pressure is set relatively low in the cells 121, 122 on the top surface side, and therefore when a large load is applied to a certain laminated air cell 10, the cells 121, 122 on the top surface side of the laminated air cell 10 are This is to prevent air from escaping to another laminated air cell 10. On the other hand, air may be circulated between the cells 111 and 112 (bag 11) on the bottom surface side. This is because, as described above, the cells 111 and 112 on the bottom surface side are filled with air having a sufficient internal pressure, and therefore even when a large load is applied to a certain laminated air cell 10, the bottom of the laminated air cell 10 is This is because there is not much room for air to escape from the surface side cells 111 and 112 to another laminated air cell 10.

  In each region other than the buttocks / thigh region, air may be allowed to flow between adjacent laminated air cells or may be blocked. When the air is passed between the adjacent laminated air cells in each region, the air supply path to the air mattress 1 can be simplified.

  Such an air mattress 1 is particularly suitable for use in a special bed having a back raising function and a knee raising function. The reason is as follows.

  When the bed is raised back, the weight of the user is concentrated on the buttocks, so that a large load is applied to the air cells arranged in the buttocks and thigh regions of the air mattress. Here, in a general air mattress, the air cells are arranged so as to be orthogonal to the longitudinal direction of the air mattress. Therefore, when a large load is applied to a part of the air cell, the air in the part escapes in the left-right direction (short direction) of the air mattress. As a result, the body of the user may be extremely depressed in the portion, and a hammock phenomenon may occur. Further, if the thickness of the air cell is not sufficient, it may bottom out.

  On the other hand, in the present embodiment, the laminated air cell 10 is arranged in the buttocks / thigh region in parallel with the longitudinal direction of the air mattress 1, that is, along the direction in which the body extends. Therefore, even if the weight is concentrated on the user's buttocks by raising the back, the laminated air cell 10 receives a load not only from the buttocks but also from other parts of the body such as the thighs. It does not extremely sink into the laminated air cell 10. Therefore, the internal pressure of the cells 121, 122 on the top surface side can be set low so that the body of the user is slightly depressed, but it is possible to reduce the risk of bottoming and hammock phenomenon when raising the back. Become.

  Further, in the laminated air cell 10 in the buttocks / thigh region, the flow of air is blocked between the cells 111, 112 on the bottom surface side and the cells 121, 122 on the top surface side, and the cells 111 on the bottom surface side, Since 112 is filled with air having a sufficient internal pressure, bottoming can be reliably prevented.

  In addition, since the unevenness is formed on the top surface of the laminated air cell 10 by the cells 121 and 122, it is possible to support the user's body so as to wrap it in a wide area and reduce the contact pressure. Since these cells 121 and 122 are movable around the welding portion 13 as a rotation axis, they can flexibly follow the body and support the body even when the body slightly moves. That is, by using the laminated air cell 10, it is possible to obtain the effect of preventing bedsores without thickening the air cell or maintaining the internal pressure at a low pressure.

  Furthermore, each laminated air cell 10 has a stable structure in which two cells are arranged in two layers, and has good load resistance.

  As described above, in the buttock / thigh region, due to the characteristics of the structure and arrangement (direction) of the laminated air cell 10 itself, it is possible to prevent the user's buttock from being extremely depressed when raising the back. Therefore, even when the thickness of the air mattress 1 is relatively thin, for example, 75 mm to 80 mm, it is possible to prevent bottoming of the buttocks and hammock phenomenon.

  In addition, in a general mattress, when the back of the bed is raised, the body of the user slides forward (toward the foot of the bed), and the position is likely to shift. Therefore, in the air mattress 1, the laminated air cells 20 are arranged in parallel with the lateral direction of the air mattress 1 in the waist region that is bent in a valley shape when the back is raised. As a result, when the back is raised, the air mattress 1 easily bends following the bed bottom 3 and the air mattress 1 can be prevented from rising. Further, the unevenness formed by the cells on the top surface side of the laminated air cell 20 makes it difficult for the user's body to slip, so that displacement of the body can be prevented and the posture can be maintained. In addition, the air cell arranged to prevent the displacement of the user and maintain the posture in this way is also called an anchor cell.

  Further, in a general mattress, when the knees are raised, the lower limbs of the user are likely to shift toward the waist. Therefore, in the air mattress 1, the laminated air cell 20 is arranged as an anchor cell in the knee region that is bent like a mountain when the knee is raised. As a result, the air mattress 1 easily bends following the bed bottom 3, and the air mattress 1 can be prevented from rising and the like. Moreover, the unevenness formed by the cells on the top surface side of the laminated air cell 20 makes it difficult for the back of the user's knees to slip relative to the laminated air cell 20, so that displacement of the body can be prevented.

  As described above, according to the first embodiment of the present invention, it is possible to prevent the bottoming and the hammock phenomenon even when the back is raised without excessively thickening the air mattress 1. Becomes Therefore, the air mattress 1 can be preferably used especially for an overlay in a bed bottom having a back raising function.

(Second embodiment)
FIG. 9 is a top view showing an air mattress according to the second embodiment of the present invention. FIG. 10 is a sectional view taken along line BB of FIG.

  As shown in FIGS. 9 and 10, in the buttocks / thigh region of the air mattress 4 according to the present embodiment, a plurality of laminated air cells 10 are arranged in the longitudinal direction of the air mattress 4 as in the first embodiment. It is arranged in parallel with. The configuration and operation of the laminated air cell 10 in the buttocks / thigh region are the same as in the first embodiment.

  A plurality of air cells 40 are arranged at the ends of the head region, the waist region, the knee region, and the lower leg region so as to be orthogonal to the longitudinal direction of the air mattress 4. Each air cell 40 is a general air cell having a cylindrical shape. At the ends of the head region, the waist region, the knee region, and the lower leg region, a large load is not locally applied. Therefore, by arranging the air cell 40 having a simple structure in these regions, The manufacturing cost of the mattress 4 can be reduced.

  At the left and right ends of the upper body region and the lower leg region, that is, at the peripheral edge of the air mattress 4, one laminated air cell 10 is arranged in parallel to the longitudinal direction of the air mattress 4. The structure of the laminated air cell 10 is the same as that of the first embodiment, but in the laminated air cell 10 arranged at the peripheral portion of the air mattress 4, it is preferable to set the internal pressure of the cell on the top surface side to be high. As a result, it becomes easier to assist in changing the posture of the user.

  An air cushion 50 is arranged in each of the inner regions of the upper body region and the lower leg region. FIG. 11 is a partially enlarged cross-sectional view showing the internal structure of the air cushion 50. As shown in FIG. 11, the air cushion 50 has an upper sheet 51, a lower sheet 52, and an inner sheet 53 formed of a flexible resin material. The upper surface sheet 51 and the lower surface sheet 52 are welded to each other at their peripheral portions and form a bag body as a whole. The inner sheet 53 is disposed between the upper surface sheet 51 and the lower surface sheet 52, and is alternately welded to the upper surface sheet 51 and the lower surface sheet 52 at the welding portion 54. When such an air cushion 50 is filled with air, the upper sheet 51 and the lower sheet 52 are alternately pulled inward by the inner sheet 53, and fine irregularities are formed on the surface of the air cushion 50.

  The number of air cushions 50 arranged in each area may be appropriately adjusted depending on the size of each area, the size of the air cushion 50, and the like. In this embodiment, two air cushions 50 are arranged, two in each of the upper body region and the lower leg region.

  In such an air mattress 4, since the air cushion 50 is arranged in the upper body region and the lower leg region, the top surface of the air cushion 50 supports the body in a wide area along the irregularities of the body of the user. You can

  As described above, according to the second embodiment of the present invention, since the laminated air cells 10 are arranged in the buttocks / thigh regions of the air mattress 4 in parallel with the longitudinal direction of the air mattress 1, it is possible to raise the back of the air mattress 1. Even when a large load is applied to a part of the buttocks / thigh region, it is possible to suppress an extreme depression of the part. Therefore, it is possible to prevent bottoming and hammock phenomenon without making the air mattress 1 excessively thick.

  Further, according to the second embodiment of the present invention, since the air cells 40 having a simple shape are arranged at the ends of the head region, the waist region, the knee region, and the lower leg region, the manufacture of the air mattress 4 is performed. The cost can be suppressed.

  Further, according to the second embodiment of the present invention, since the air cushion 50 is arranged in the upper body region and the lower leg region, it is possible to support the user's body so as to wrap the body by the unevenness generated on the top surface. Therefore, the contact pressure on the body can be reduced. Further, since the number of parts can be reduced, it is possible to suppress the manufacturing cost and the maintenance cost.

(Third Embodiment)
FIG. 11 is a top view showing an air mattress according to the third embodiment of the present invention. FIG. 12 is a sectional view taken along line CC of FIG.

  The air mattress 5 according to the present embodiment is a replacement type air mattress that is directly laid on the bed bottom and used, and has a thickness H3 of, for example, about 16 cm.

  A laminated air cell 10 is arranged parallel to the longitudinal direction of the air mattress 5 in the lower part of the inner region of each of the upper body region, the buttocks / thigh regions, and the lower leg region of the air mattress 5. The structure of the laminated air cell 10 in each region is similar to that of the first embodiment.

  Further, an air cushion 50 is arranged on the upper stage of the laminated air cell 10 arranged in each of the upper body region, the buttocks / thigh region, and the lower leg region. The structure of the air cushion 50 is similar to that of the second embodiment.

  At the ends of the head region, the waist region, the knee region, and the lower leg region, a plurality of air cells 60 are arranged so as to be orthogonal to the longitudinal direction of the air mattress 5. The air cell 60 is a one-air-chamber air cell composed of one bag 61 as a whole. The thickness of the air cell 60 (that is, the thickness H3 of the air mattress 5) is approximately equal to the sum of the thickness of the laminated air cell 10 and the thickness of the air cushion 50. Further, the length and width (length in the lateral direction) of the air cell 60 can be adapted to the bed frame using the air mattress 5, and can be matched with the air cells and air cushions arranged in other areas. The size is not particularly limited as long as it is small.

  On the inner peripheral surface of the bag body 61, a film-shaped member (so-called suspension) 62 is provided so as to extend in a direction substantially parallel to the floor surface of the air mattress 5. The film-shaped member 62 is welded to a position approximately half the thickness of the bag 61, and connects regions of the inner peripheral surface facing each other. By providing such a film-like member 62, even when a load is applied to the air cell 60, it is possible to prevent the air cell 60 from greatly expanding in the lateral direction (the left-right direction in FIG. 13), and the air cell 60 It is possible to suppress the amount of compression in the thickness direction.

  In the air cell 60, the contact pressure to the user's body may be reduced by setting the internal pressure low so that the body sinks. A large load is rarely applied locally to the location of the air cell 60 in the air mattress 5 under normal use conditions, so even if the internal pressure is set to be low, bottoming or hammock phenomenon may occur. It is unlikely to occur.

  Further, one air cell 70 is provided in parallel with the longitudinal direction of the air mattress 5 at each of the left and right ends of the upper body region, buttocks / thigh region, and lower leg region, that is, at the peripheral edge of the air mattress 5. It is arranged. The internal structure and thickness of the air cell 70 are similar to the internal structure (see FIG. 13) and thickness of the air cell 60. On the other hand, the length of the air cell 70 in the longitudinal direction is shorter than that of the air cell 60 in accordance with the length of the laminated air cell 10. The width (length in the widthwise direction) of the air cell 70 may be appropriately adjusted according to the size of each region in which the air cell 70 is arranged and the size and number of other air cells (the laminated air cell 10, the air cushion 50). Good. In the air cells 60 arranged in the peripheral portion of the air mattress 5, the internal pressure may be set to be high. As a result, it becomes easier to assist in changing the posture of the user.

  As described above, according to the third embodiment of the present invention, the air cushion 50 is arranged on the laminated air cell 10 arranged in the upper body region, the buttocks / thigh region, and the lower leg region. The effect of preventing bottoming and the hammock phenomenon by the laminated air cell 10 can be exerted even in a replacement type air mattress.

  The present invention described above is not limited to the first to third embodiments, and various inventions can be obtained by appropriately combining a plurality of constituent elements disclosed in the first to third embodiments. Can be formed. For example, some constituent elements may be excluded from all the constituent elements shown in the first to third embodiments, or the constituent elements shown in the first to third embodiments may be appropriately combined and formed. May be.

1, 4, 5 Air mattress 2 Mattress 3 Bed bottom 10, 20 Laminated air cell 11, 12, 61 Bag 13, 13 54 Welding part 31 Back bottom 32 Waist bottom 33 Leg bottom 34 Lower leg bottom 40, 60, 70 Air cell 50 Air cushion 51 Top Sheet 52 Bottom Sheet 53 Inner Sheet 62 Membrane Member 111, 112, 121, 122 Cell 113 Gap Area 114 Air Supply Port 115 Air Supply Channel

Claims (8)

An air mattress in which a plurality of air cells are arranged,
In the plurality of air cells, four cells that expand in a tubular shape by enclosing air inside are connected to each other in a region on one axis parallel to the longitudinal direction of the cells, and rotate in the region on the one axis. Including a laminated air cell that is an air cell configured to be movable relative to each other as an axis ,
At least a boundary between the lower body region and the upper body region, which is a region located on the head side from the central portion, in the lower body region, which is a region located on the leg side from the substantially central portion in the longitudinal direction of the air mattress. An air mattress in which a plurality of the laminated air cells are arranged in the buttocks and thigh regions that are in contact with each other such that the longitudinal direction of the laminated air cells is parallel to the longitudinal direction of the air mattress. The laminated air cell,
A first bag body formed of a sheet material made of a flexible resin material;
A sheet material made of a flexible resin material, and a second bag body separate from the first bag body ,
The region on the 1-axis is a region on the 1-axis parallel to the longitudinal direction of the first and second bags , and the second bag is overlapped with the first bag, Integrated with the first bag body by a welding portion provided in an axial region ,
The four cells are formed by two regions generated by separating the first bag body by the welding portion and two regions generated by separating the second bag body by the welding portion. The air mattress according to claim 1, wherein   The air mattress according to claim 2, wherein the welded portion is provided at a substantially central portion in a lateral direction of the first and second bags.   The flow of air is interrupted between the first bag and the second bag in each of the laminated air cells arranged in the buttocks and thigh regions. The air mattress according to any one of items. An air mattress in which a plurality of air cells are arranged,
The plurality of air cells include a laminated air cell in which four cells that expand in a tubular shape by enclosing air inside are air cells that are connected to each other in a region on one axis parallel to the longitudinal direction of the cells,
At least a boundary between the lower body region and the upper body region, which is a region located on the head side from the central portion, in the lower body region, which is a region located on the leg side from the substantially central portion in the longitudinal direction of the air mattress. In the buttocks and thigh regions that are in contact with each other, a plurality of the laminated air cells are arranged such that the longitudinal direction of the laminated air cells is parallel to the longitudinal direction of the air mattress,
In the waist region, which is a region near the boundary between the lower body region and the upper body region in the upper body region, at least one air cell is arranged such that the longitudinal direction of the at least one air cell is orthogonal to the longitudinal direction of the air mattress. arranged to be in that, d a mattress.   In the upper body region, in the region adjacent to the waist region on the head side, the laminated air cell is arranged such that the longitudinal direction of the laminated air cell is parallel to the longitudinal direction of the air mattress. Item 5. The air mattress according to item 5. An air mattress in which a plurality of air cells are arranged,
The plurality of air cells include a laminated air cell in which four cells that expand in a tubular shape by enclosing air inside are air cells that are connected to each other in a region on one axis parallel to the longitudinal direction of the cells,
At least a boundary between the lower body region and the upper body region, which is a region located on the head side from the central portion, in the lower body region, which is a region located on the leg side from the substantially central portion in the longitudinal direction of the air mattress. In the buttocks and thigh regions that are in contact with each other, a plurality of the laminated air cells are arranged such that the longitudinal direction of the laminated air cells is parallel to the longitudinal direction of the air mattress,
At least one air cell is arranged in a region of the lower body region that is in contact with the buttocks and thigh regions on the leg side so that the longitudinal direction of the at least one air cell is orthogonal to the longitudinal direction of the air mattress. are, d a mattress. Equipped with four cells that expand in a tubular shape by enclosing air inside,
An air cell in which the four cells are connected to each other in a region on one axis that is parallel to the longitudinal direction, and are movable with each other with the region on the one axis as a rotation axis .

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