U.S. patent number 3,653,083 [Application Number 05/036,200] was granted by the patent office on 1972-04-04 for bed pad.
Invention is credited to Roy Lapidus.
United States Patent |
3,653,083 |
Lapidus |
April 4, 1972 |
**Please see images for:
( Certificate of Correction ) ** |
BED PAD
Abstract
An aerated bed pad is described which permits varied positions
of comfort for the user. The bed pad comprises a sheet of open foam
supported by a perforated, branched plastic tube having a single
open end into which a current of air is passed. The air passes out
through the perforations then through the foam sheet to the body of
the user. The air supply is variable and the tube inflatable and
deflatable. In one model there are two interlaced, alternating
tubes. In another model one tube is interlaced with spaced,
non-porous resilient strips.
Inventors: |
Lapidus; Roy (Newton, MA) |
Family
ID: |
21887221 |
Appl.
No.: |
05/036,200 |
Filed: |
May 11, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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687055 |
Nov 30, 1967 |
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Current U.S.
Class: |
5/713; 5/709;
5/714; 601/148 |
Current CPC
Class: |
A47C
27/081 (20130101); A47C 27/18 (20130101); A47C
27/088 (20130101); A47C 27/144 (20130101); A61G
7/05776 (20130101); A47C 27/20 (20130101) |
Current International
Class: |
A47C
27/14 (20060101); A47C 27/18 (20060101); A61G
7/057 (20060101); A47c 027/08 () |
Field of
Search: |
;5/348,349,350
;128/33 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gay; Bobby R.
Assistant Examiner: Calvert; Andrew M.
Parent Case Text
BACKGROUND OF INVENTION
This is a continuation-in-part of my co-pending application Ser.
no. 687,055 filed Nov. 30, 1967, and now abandoned.
Claims
I claim:
1. A bed pad comprising:
a. A flexible, resilient porous body-supporting sheet resting
on
b. a flexible base support which supplies a variable current of air
to the bottom surface of the sheet so that the air passes through
to the outer surface of the sheet and also causes variable flexing
motion of portions of said sheet; said sheet comprising
ba. an inflatable and deflatable flexible tubular member (41)
having perforations on its upper surface, a single open end (47),
and a plurality of convolutions or closed branches (43); said
branches being arranged so as to interlace beneath said porous
sheet with
bb. either a second flexible, inflatable and deflatable perforated
tubular member (245) or spaced flexible non-porous resilient strips
(48); each said tubular member being separately connected to a
variable air supply;
said pad being characterized in that deflation occurs by the
passage of air from said perforated tubular member, most of said
air escaping through said porous body-supporting sheet.
2. The bed pad of claim 1 wherein there are two interlaced tubular
members (145,245) each connected so that they alternate in
inflation and deflation.
3. The bed pad of claim 1 wherein there is one tubular member (45)
interlaced with spaced non-porous strips (48).
4. The bed pad of claim 1 wherein the convolutions or branches are
oriented transversely.
5. The bed pad of claim 1 wherein the inflation period of said
tubular tubular member does not exceed 1 minute.
Description
Bed pads have been used in the past to improve the comfort of
patients immobilized for long periods of time. A so-called
sheepskin pad has been used as well as foam pads, both smooth and
convoluted. However, patients lying on such pads for long periods
of time are still quite uncomfortable and very frequently acquire
skin rashes and bed sores.
One object of this invention is to provide a bed pad of
substantially improved comfort.
Another object of this invention is to provide a bed pad which will
substantially decrease the incidence of skin rashes and bed
sores.
Other objects and advantages of this invention will be apparent
from the description and claims which follow taken together with
the appended drawings.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a plan view of an embodiment of this invention, with
partial cutaway.
FIG. 2 is a section along line 2--2 of FIG. 1 showing the inflated
condition.
FIG. 3 is similar to FIG. 2 except that it shows the deflated
condition.
FIG. 4 is a plan view of another embodiment of this invention with
partial cutaway.
FIG. 5 is a section along line 5--5 of FIG. 4 showing one tubular
member 145 inflated and the other 245 deflated.
FIG. 6 is a partial longitudinal section of the inlet end of the
support member of FIG. 4.
SUMMARY OF INVENTION
The bed pad of the present invention comprises generally a
flexible, resilient, porous sheet supported by a pad-like structure
including means for passing a current of air through resilient
materials having an interconnected cell structure.
The support structure has large air-spaces and can comprise, for
example, a length of flexible, plastic tubular member having
openings on its top surface and arranged in a convoluted or
branched form beneath the porous sheet. One end of the tube is
closed, while the other end is connected to a small air compressor
or the like. The support structure and porous sheet may be formed
as separate pieces which can be permanently or temporarily attached
to one another. It is generally preferable to have the porous sheet
removable so that it may be exchanged or cleaned. A variable air
supply is used providing a wide variety of different comfort
positions.
The bed pad of this invention provides an air current at the
interface between the patient and the porous pad, resulting in a
flexible, comfortable support which prevents skin rashes and bed
sores.
The air passes through to the outer surface of the sheet. As the
air current varies variable flexing motion of portions of the sheet
results.
In one form of the invention the tubular member alternately
inflates and deflates, with interlaced, resilient strips providing
a floor on deflation. In another form, two interlaced tubular
members are used which alternately inflate and deflate. In both
cases deflation occurs solely by the passage of air from said
perforated tubular member, most of said air escaping through said
porous pad. The branches are preferably transversely oriented with
respect to the pad and thus with respect to the patient, in order
to provide the optimum support and skin massaging action.
SPECIFIC EXAMPLES OF INVENTION
In the example illustrated in FIGS. 1, 2 and 3, two sheets of
relatively thin plastic such as vinyl plastic, 43 and 44, are
vacuum-formed and heat sealed so as to form a continuous closed,
branched collapsible tube structure 4 having perforations 46, as
well as a plurality of discrete, elongated pockets 48 of smaller
diameter than the convoluted tube 45 in its inflated condition.
Prior to joining the molded sheets 43 and 44 by heat sealing, or
other similar techniques, strips of relatively heavier walled
non-perforated flexible tubing 49 are put into the pockets from
which the sealed strips 48 are to be formed. An air supply conduit
47 is provided at the side. The resulting support structure is
sealed at its edges so that air coming in through inlet 47 will
pass into the convoluted portions but can escape only through air
holes 46.
This embodiment is intended to be used with a variable air supply
such as a small compressor. When the air is moving in, the tubular
section 45 is inflated. It is preferably used in combination with
base foam sheet 42 which is somewhat thinner than upper open foam
sheet 41. When the air is not passing into the structure, tubular
section 45 collapses so that the upper foam sheet 41 is effectively
being supported by the plurality of flexible but self-supporting
spaced strips 49.
It is noted that in its inflated condition the thin tubular
structure 45 is constantly higher than the tubular sections 49, but
that upon being deflated collapses to or below the height of
section 49.
In the embodiment illustrated in FIGS. 4, 5 and 6, upper open foam
sheet 41 overlays two sheets of relatively thin plastic such as
vinyl plastic, 100 and 101 heat sealed to form closed interlaced,
inflatable, perforated tubular members 145 and 245 having
respectively closed branches 145a and 245a and singe air supply
connections 147 and 247. The sheet 101 forms the upper walls 143
and 243 while sheet 102 forms the lower walls 144 and 244 of the
two interlaced tubular members. Upper walls 143 and 243 have
perforations 146 and 246 permitting air to escape from the tubular
members and through the foam sheet 41. The structure rests on base
foam sheet 42.
The air supplies to inlets 147 and 247 are so regulated as to
alternate between the two tubular members, thus providing alternate
inflation and deflation. When air is shut off from one tubular
member, it loses its air and collapses.
I have found that the combination of variable air supply together
with an inflatable and deflatable support provides a much higher
degree of comfort and freedom from skin disease for the patient
than has hitherto been feasible. With rapid inflation e.g., 1 1/2
to 3 seconds from a high volume air source, e.g., 1 to 1 1/2 cubic
feet/minute, the patients comfort is further enchanced by a
messaging action. Generally, the inflation period, the period
during which air enters the tube, should not exceed 1 minute and is
preferably 30 seconds or less.
Although it is not intended that this invention be limited in any
way to particular dimension, I have found that a useful pad in
accordance with this invention can be made with a length of about 3
to 7 feet and a width of about 1 1/2 to 3 feet. The collapsible,
perforated tubes can have a wall thickness of about 0.020 inches.
The upper foam sheet can be a thickness of the order of magnitude
of 1/2 to 1 1/2 inches while the supporting structure can be of the
order of magnitude of 1 inch and the bottom sheet about 1/4 inch in
thickness. Both upper and lower sheets preferably extend beyond the
extremities of the support structure.
One method of providing a variable air supply comprises the use of
an air compressor and receiving tank, wherein an unloader valve
opens when the tank pressure reaches a predetermined level, e.g.,
28 p.s.i. and closes when the tank pressure falls to a second
predetermined level, e.g., 8 p.s.i. The volume of air released from
the tank during this interval inflates one porous tubular member
and also passes from the air-holes through the foam sheet 41. When
the interval is over, the remaining air bleeds out through
air-holes until it is deflated; this, of course, being aided by the
weight of the patient's body. The valve cycle and the porosity of
the tubular members and sheet 41 can, of course, be in accordance
with the desires of the doctor or patient.
In another method, a steadily operating air compressor is used with
a slowly rotating distributor valve which can give a variety of
cycles to one or more pads e.g., inflate tube for 15 seconds, no
air for 15 seconds, inflate second tube for 15 seconds, no air for
15 seconds; or rotate first tube 30 seconds, inflate second tube 30
seconds, etc.
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