JPH11299579A - Mattress - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mattress effective to prevent a bedsore or the like, by effectively distributing body pressure according to the loading rate of a body part in a lying posture. SOLUTION: Recessed parts are formed nearly over the whole area excepting for the peripheral part of the surface of the base material 2 of a slot urethane foam and the depths of these recessed parts are varied depending on a recessed part Da corresponding to a head peripheral area (a), a recessed part Db corresponding to a shulder peripheral area (b), a recessed part Dc corresponding to a wide back peripheral area (c) and a recessed part Dd corresponding to a hip peripheral area (d), a recessed part De corresponding to a tight peripheral area (e) and a recessed part Df corresponding to a leg peripheral area (f) to be thinner with the increase of the loading rate to the place. A thermoplastic material 3 being visco-elastic at a normal temperature is filled into these respective recessed parts Da to Df and its surface is coated with a coating material 4 such as soft urethane foam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mattress having an enhanced body pressure dispersing effect.

[0002]

2. Description of the Related Art Conventionally, as a structure of a mattress, for example, the hardness of a head, a chest, a waist, a leg, etc. is changed according to a load ratio of a body part in a sleeping posture, and a sinking amount is adjusted. Mattresses that can maintain a correct sleeping posture are known.

[0003]

However, although the mattress as described above has the effect of keeping the sleeping posture correctly, the body pressure is dispersed when the same posture is maintained for a long time, such as a bedridden person. Thus, the effect of preventing bed slippage and the like could not be effectively achieved.

Accordingly, an object of the present invention is to provide a mattress capable of effectively dispersing body pressure and effectively suppressing the occurrence of bedsores, especially for a person who is sleeping in the same position for a long time. .

[0005]

In order to achieve the above object, according to the present invention, in the first aspect, a concave portion is formed in a portion of the base material corresponding to at least the entire region from the shoulder to the foot of the human body in the supine position. In addition, the concave portion is filled with a thermoplastic material having viscoelasticity at room temperature, and the surface of the thermoplastic material is covered with a covering material to form a mattress. The depth of the concave portion of the base material and the thermoplastic material The thickness of at least a portion corresponding to the shoulder peripheral region, a portion corresponding to the waist peripheral region, and a portion corresponding to the leg peripheral region,
It was made to change according to each load ratio.

[0006] By filling a portion corresponding to the entire region from the shoulder to the toe in the supine position with a thermoplastic material having viscoelasticity, the load applied in the vertical direction can be changed in all directions, such as the horizontal direction and the oblique direction. Direction, and at this time,
By changing the thickness of the thermoplastic material according to the load ratio of the body part, for example, a portion with a high load ratio is made thicker, and a portion with a low load ratio is made thinner, so that an excessive load is applied to one place To prevent this.

Here, the shoulder peripheral region means at least a peripheral region including a scapula, the waist peripheral region means at least a peripheral region including a sacral portion, and the leg peripheral region includes at least a heel portion. The area around the scapula, near the sacrum, and near the heel are all areas where a large load is applied. In addition, the mattress includes a mattress for a bed or a bed other than a bed. At this time, since a pillow is generally used around the head, it is not always necessary to provide a thermoplastic material, but it is optional.

According to a second aspect of the present invention, as the thermoplastic material, at least a softener and a tackifying resin are blended with a polystyrene resin and butyl rubber.
Such a compound has a low viscosity at a predetermined temperature or higher and has fluidity, and has a property of becoming highly viscous at room temperature and rich in viscoelasticity, and is slowly deformed and recovered by applying a load, unloading. In addition, even when a load is applied from one direction, stress can be generated in multiple directions to disperse body pressure, which is preferable.

Further, even if the thickness is reduced, a feeling of bottoming is hardly generated, and there is no problem that the coating material flows out even if the coating material is broken at room temperature, and the temperature rise due to body temperature is small. Furthermore,
This composition has good heat resistance, deteriorates due to temperature change,
There is no change in weight or the like, and the feel of the surface covered with this coating material is good for human skin.

In the present invention, the maximum thickness of the thermoplastic material is 20 mm, and the minimum thickness is 5 mm. Here, if the maximum thickness is 20 mm, the effect of dispersing the body pressure is sufficient, and even if the maximum thickness is more than 20 mm, there is a waste in terms of cost-effectiveness, and the weight is heavy, which is disadvantageous. If the thickness is less than 5 mm, the expected effect of dispersing body pressure cannot be obtained. Therefore, the above thickness range is set.

[0011]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is an explanatory view for explaining the concave portion of the base material of the mattress according to the present invention, wherein (A) is a plan view, (B) is a cross-sectional view taken along line AA of (A), and (C) is FIG. 2A is a cross-sectional view taken along the line BB of FIG. 2, FIG. 2 is a cross-sectional view showing a state in which a thermoplastic material is filled in the concave portion, and FIG.

The mattress according to the present invention is constituted as a mattress 1 having excellent body pressure dispersion, in which bedsores and the like hardly occur, even when the same posture is maintained for a long time, and as shown in FIG. A base material 2 having a concave portion C having a different depth on the side, a thermoplastic material 3 (FIG. 2) filled in the concave portion C of the base material 2, and affixed to the surface of the thermoplastic material 3 Coating material 4 (FIG. 2).

The depth of the concave portion D of the base member 2 is changed according to the load ratio of the body part in the supine position. The portion having a low ratio has the depth of the concave portion D reduced, and the thermoplastic material 3 is filled with a thickness corresponding to the depth of the concave portion D.

FIG. 3 is an explanatory diagram for explaining a load ratio in a general supine position. When the human body P takes a supine position, a shoulder having a weight ratio of about 8% is provided around the head. It is said that a load of about 33% is applied around the waist, about 44% around the waist, and about 15% on the legs, of which the scapula is particularly around the shoulder and the sacrum around the waist. The load around the heel is large around the leg.

[0015] For this reason, bedridden persons, for example, generally tend to have bedsores and the like in the sacrum area around the lumbar region where the load ratio is large, and effectively disperse the body pressure particularly in such a part where a large load is applied. If you can make it
This is effective for preventing bedsores and the like. Therefore, the concave D
And the thickness of the thermoplastic material 3 are determined in consideration of the load ratio as described above.

In the embodiment, the base material 2 is a soft urethane foam, but a general foam resin material or a mattress material such as a fiber laminate can be used. In the embodiment shown in FIG. 1, the left side of the figure is the head side of the sleeping posture and the right side is the leg side.
As shown in FIG. 1A, a portion Da is provided in the entire region except for the peripheral portion, and as shown in FIG. 1B, a portion Da corresponding to the head peripheral region a along the longitudinal direction from the left side of the drawing. A portion Db corresponding to the shoulder peripheral region b including the scapula, a portion Dc corresponding to the wide back peripheral region c, a portion Dd corresponding to the waist peripheral region d including the sacral portion, and a thigh peripheral region e. It is divided into six parts: a corresponding part De and a part Df corresponding to the leg peripheral region f including the heel.

The specific numerical data such as the classification is as follows:
The area around the head a in the total length of mattress 1 of 1750 mm
Has a longitudinal length of 230 mm and a depth of the concave portion Da of 8 mm,
The length in the longitudinal direction of the shoulder peripheral region b is 300 mm and the concave portion Db
Has a depth of 10 mm, a longitudinal length of the wide back peripheral region c is 210 mm, a depth of the concave portion Dc is 8 mm, a longitudinal length of the waist peripheral region d is 330 mm, and a depth of the concave portion Dd is 15 mm. The length in the longitudinal direction of the thigh peripheral region e is 440 mm and the concave portion De
Is 5 mm, the length of the leg peripheral region f is 200 mm, and the depth of the concave portion Df is 10 mm.

That is, the depth of the concave portion Dd in the waist peripheral region d is made deepest in the descending order of the load ratio, and the concave portion Db in the shoulder peripheral region b and the leg peripheral region f in which the load ratio is large.
Of the concave portion Df of the wide-back portion peripheral region c where the load ratio is relatively small and the concave portion Df of the thigh peripheral region f are relatively shallow. At this time, the depth of the concave portion D is 5 to 20.
It is preferred to be in the range of mm. This is because when the thickness of the thermoplastic material 3 filled in the concave portion D is 5 mm or less, the effect of dispersing the body pressure is reduced, and when the thickness exceeds 20 mm, the effect of increasing the cost-effectiveness is not obtained. Because it also gets heavier.

In the embodiment, the thermoplastic material 3 is composed of a polystyrene resin and butyl rubber mixed with a softening agent of an aliphatic hydrocarbon compound, a tackifying resin and an antioxidant. When the composition is heated to a temperature within the range, the viscosity decreases and the composition has fluidity. At room temperature, the composition increases in viscosity and has viscoelasticity, but the composition has almost no fluidity.

In the embodiment, the thermoplastic material 3 which has been heated to 150 ° C. or more to give fluidity is directly injected into each of the concave portions Da to Df as shown in FIG. And cooled to room temperature. In addition, since a pillow or the like is generally used for the head peripheral region a, the concave portion Da and the thermoplastic material 3 may not necessarily be provided.

When a load is applied in the vertical direction, the thermoplastic material 3 generates stress not only in the vertical direction but also in the horizontal direction.
It has characteristics that it can be generated widely in an oblique direction to spread the load widely, and that even when the thickness is reduced, the feeling of bottoming can be reduced. In addition, since it has a delay in the recovery from deformation when the load is unloaded, when used as a mattress, even if the user lying on the back turns, it is comfortable because there is no reactionary swing back A feeling of use can be obtained.

The thermoplastic material 3 has a small rise in temperature due to body temperature, and a change in hardness due to a change in temperature.
In a hardness test according to SK 6400, when the hardness when compressed by 25% with a pressurizer of φ200 mm was measured, it was 2 at 40 ° C.
0.9 kg, 24.5 kg at -20 ° C, almost unchanged. In addition, the heat resistance is good, and no change in weight or alteration of the contents is observed even after continuous heating at 100 ° C. for 1000 hours.

Further, a coating material 4 to be described later is adhered to this surface. At room temperature, even if the coating material 4 is torn, the thermoplastic material 3 does not flow out and is heated. Even when the concave portion D is filled with fluidity, the thermoplastic material 3 does not impregnate the soft urethane foam of the base material 2. The feeling when touched from the surface via the coating material 4 is good as human skin feeling.

The coating material 4 is provided for the purpose of protecting the surface of the thermoplastic material 3, eliminating the stickiness of the surface, and at the same time, reducing the cooling sensation when directly touching the thermoplastic material 3. It is made of a pliable material that can smoothly follow the deformation of the surface of the thermoplastic material 3, and is appropriately selected depending on the case where the surface strength is provided and the case where the air permeability is provided. And a film-like single-layer structure or a laminate of a film-like material and a foam may be used.

Here, since the main purpose of the coating material 4 is to prevent stickiness of the thermoplastic material 3 and to prevent adhesion of dirt, any sheet-like material can be used.
Any material that does not break when the cushion material is used may be used.
In the case of coating on the surface of the thermoplastic material 3, it can be attached without using an adhesive as long as it is a film-like material. When a foam laminate or the like is used, it is only necessary to stick the adhesive to the surface without using an adhesive or the like, but an adhesive or the like may be used. In addition, the thermoplastic material 3
Since the specific heat is lower than that of the polyurethane foam or the like of the base material, it is easy to feel a cooling sensation in the contact portion. Can be prevented and a comfortable feeling of use can be given.

Therefore, in order to give a surface strength and a comfortable feeling of use, for example, the thickness is 1 to 10 mm, preferably 3 to 5 mm.
And a laminated material obtained by laminating a soft urethane foam having a thickness of 20 to 100 μm with an adhesive or an adhesive, and fixing the urethane film on the front side with an adhesive or the like. When it is necessary to provide air permeability, for example, a density of 15 to 40 kg / m
A foam material obtained by slicing the flexible urethane foam of No. ³ to a thickness of 5 to 12 mm is used and fixed by bonding or the like.

Next, the body pressure dispersing effect of the mattress 1 configured as described above will be described. A mattress of a conventional soft urethane foam and a mattress 1 according to the present invention are laid with a sensor mat on an upper surface thereof, and a subject lays 170 cm tall and weighs 65 kg without using a pillow on the mattress, and takes one minute after taking a sleeping posture. When the load of each part was measured, data as shown in Table 1 was collected.

[0028]

[Table 1]

As a result, it can be seen that the product of the present invention has a smaller number of sensor contacts than the conventional product, thereby reducing the amount of sinking, and that the product of the present invention has a lower body pressure at both the average value and the maximum pressure than the conventional product. It was proved that the body pressure dispersion effect was high.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, the dimensions and the like of each area of the mattress 1 are arbitrary, and the concave portion Da may not be formed in the head peripheral area a.

[0031]

As described above, in the mattress according to the present invention, at least a portion corresponding to the entire region from the shoulder to the toe of the base material is formed in accordance with the load ratio of the body part. Since concave portions having different sizes are formed, and the concave portions are filled with a thermoplastic material having viscoelasticity at room temperature, the body pressure can be effectively dispersed, and is effective in, for example, preventing bedsore. . Further, it is preferable to add a material of a predetermined component as the thermoplastic material, since the body pressure dispersing effect is high, and the feel and heat resistance are excellent. It is preferable that the thickness of the thermoplastic material be within a predetermined width as in claim 3 from the viewpoint of cost-effectiveness and weight.

[Brief description of the drawings]

1A and 1B are explanatory views for explaining a concave portion of a base material of a mattress according to the present invention, wherein FIG. 1A is a plan view and FIG.
Is a cross-sectional view taken along line AA of (A), and (C) is a cross-sectional view taken along line BB of (A).

FIG. 2 is a sectional view showing a state in which a concave portion is filled with a thermoplastic material.

FIG. 3 is an explanatory diagram of a load ratio in a supine position.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mattress, 2 ... Base material, 3 ... Thermoplastic material, 4
... covering material, b ... shoulder area, d ... waist area, f ...
Leg peripheral area, Da to Df ... recess.

Claims (3)

[Claims] 1. A concave portion is formed in a portion of a base material corresponding to at least an entire region from a shoulder to a toe of a human body in a supine position, and the concave portion is filled with a thermoplastic material having viscoelasticity at room temperature. In addition, in a mattress in which the surface of the thermoplastic material is covered with a covering material, the depth of the concave portion of the base material and the thickness of the thermoplastic material are at least a portion corresponding to the shoulder peripheral region and a waist peripheral region. A mattress, wherein a corresponding portion and a portion corresponding to a leg peripheral region are provided to be changed according to respective load ratios. 2. The mattress according to claim 1, wherein
A mattress, wherein the thermoplastic material is constituted by mixing at least a softener and a tackifying resin with a polystyrene resin and butyl rubber. 3. The mattress according to claim 1, wherein the thickness of the thermoplastic material is such that the maximum thickness is 20 mm and the minimum thickness is 5 mm.