U.S. patent number 3,886,610 [Application Number 05/383,298] was granted by the patent office on 1975-06-03 for hospital bed.
This patent grant is currently assigned to Huntington Institute of Applied Medical Research. Invention is credited to Charles Hunter Shelden.
United States Patent |
3,886,610 |
Shelden |
June 3, 1975 |
Hospital bed
Abstract
A hospital bed for patients who require assistance in
repositioning themselves on the bed. A mattress for the bed is
formed by a number of separate bolsters or cushions each covered
with a removable slip-cover sheet. Each bolster extends across the
width of the bed, and the several bolsters are aligned side by side
to extend along the length of the bed. A drive mechanism is
provided on a frame of the bed to move the bolsters as a group
along the length of the bed, thereby enabling longitudinal
repositioning of the patient. End portions of the bolsters can also
be raised to assist it turning the patient. In an alternative form,
the modular mattress is carried on a frame adapted for mounting on
a standard hospital bed.
Inventors: |
Shelden; Charles Hunter (San
Marino, CA) |
Assignee: |
Huntington Institute of Applied
Medical Research (Pasadena, CA)
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Family
ID: |
26867333 |
Appl.
No.: |
05/383,298 |
Filed: |
July 11, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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171702 |
Aug 13, 1971 |
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Current U.S.
Class: |
5/81.1C;
5/727 |
Current CPC
Class: |
A61G
7/00 (20130101); A61G 7/1032 (20130101); A61G
7/1044 (20130101); A61G 7/001 (20130101); A61G
2200/32 (20130101); A61G 7/002 (20130101) |
Current International
Class: |
A61G
7/00 (20060101); A61G 7/10 (20060101); A61g
007/02 (); A61g 007/10 () |
Field of
Search: |
;297/283,223
;5/17,18,60,61,63,66,68,81,90,91,317,88 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Nunberg; Casmir A.
Attorney, Agent or Firm: Christie, Parker & Hale
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATION
This is a continuation-in-part of my co-pending patent application
Ser. No. 171,702 titled "Hospital Bed" and filed Aug. 13, 1971, now
abandoned.
Claims
What is claimed is:
1. A bed, comprising:
a bed frame having a foot end and a head end, the frame being
hinged so the head end can be raised to elevate a patient's upper
body;
mattress means for supporting a patient on the bed frame;
drive means on the frame and engaged with the mattress means for
moving the mattress means longitudinally toward the head end of the
bed and along an upwardly sloping portion of the frame adjacent the
head end when the head end is elevated, whereby a patient who has
slipped downwardly toward the foot end can be moved back toward the
head end and along the upwardly sloping frame portion by moving the
mattress means.
2. The bed defined in claim 1 in which the drive means includes
rollers rotatably mounted at the head and foot ends of the frame, a
drive belt extending between the rollers in engagement with the
mattress, and means coupled to the drive belt for maintaining the
belt under tension as the elevation of the head end is
adjusted.
3. A bed, comprising:
a bed frame having head and foot ends, the frame being arranged so
an upper frame portion adjacent the head end can be sloped upwardly
with respect to a lower frame portion adjacent the foot end,
whereby an upper portion of a patient's body can be elevated;
mattress means on the frame and including a plurality of separate
bolster sections each extending laterally across the frame, the
sections being positioned side by side to extend between the ends
of the frame; and
drive means on the frame and engageable with the bolster sections
for moving the sections along the frame toward the head end and
along the upper frame portion whereby a patient who has slipped
downwardly in the bed can be moved back toward the head end and
along the upwardly sloping frame portion without being raised off
the bolster sections.
4. The bed defined in claim 3 in which the drive means includes
rollers mounted at the head and foot ends of the frame, a drive
belt extending around the rollers longitudinally along the bed, the
bolster sections being disposed on the belt, a guide means on the
frame intermediate the rollers for guiding the belt along an upper
surface of the frame, means coupled to the belt for maintaining the
belt under tension when the elevation of the upper frame portion is
adjusted, and means coupled to the belt to move the belt
longitudinally along the bed.
5. The bed defined in claim 4 in which the bolster sections each
include a body of resilient material and a support tray fitted
against an undersurface of the resilient material; the drive belt
and trays having a releasable fastening means therebetween so an
individual bolster section can be removed from the belt as it
reaches an end of the frame to be repositioned on the belt at the
other end of the frame.
6. The bed defined in claim 5 in which said means for moving the
belt includes an electric motor, means connecting the motor to the
belt, and an operate switch and a limit switch in series connection
with the motor, the limit switch being mounted on the frame for
actuation by the bolster sections, the limit switch being operative
to disable operation of the motor when a bolster section is to be
repositioned on the frame.
7. The bed defined in claim 6 and further comprising a pair of
lifting means secured at opposite sides of the frame and arranged
to lift a selected end of the body of resilient material positioned
above the lifting means to aid in turning a patient.
8. The bed defined in claim 7 in which each support tray comprises
a base panel with an opening at each end, and a pair of movable
panels pivotably mounted on the base panel above the respective
openings, an individual tray being positionable so the lifting
means can extend upwardly through the openings to raise a selected
one of the movable panels to raise the selected end of the body of
resilient material, the tray further being positionable in a second
position so the lifting means contacts the base panel to raise the
entire bolster section with respect to an adjacent bolster
section.
9. The bed defined in claim 3 and further comprising lifting means
on the frame for elevating at least a portion of a selected bolster
section with respect to the frame.
10. The bed defined in claim 3 and further comprising a bed-pan
unit adapted to be substituted for one of the bolster sections, the
unit having a top panel with an opening therethrough to receive a
container.
11. The bed defined in claim 10 wherein the container is a plastic
bag.
12. The bed defined in claim 11 wherein the plastic bag is formed
of polyvinyl-alcohol plastic which is soluble in hot water.
13. An accessory movable-mattress system for addition to and use
with a conventional hospital bed, the conventional bed having a bed
frame with a head end which can be raised to elevate a patient's
upper body, the accessory system comprising:
an elongated hinged frame adapted to fit on the bed frame, the
hinged frame having a head section which can be raised in
conjunction with the bed-frame head end;
mattress means for supporting a patient on the hinged frame;
and
drive means on the hinged frame and engaged with the mattress means
for moving the mattress means longitudinally toward the head end of
the bed and along an upwardly sloping portion of the frame head
section when the head section is elevated, whereby a patient who
has slipped downwardly toward a foot end of the bed can be moved
back toward the head end and along the upwardly sloping frame
portion by moving the mattress means.
14. The accessory system defined in claim 13 wherein the mattress
means comprises a plurality of separate bolster sections each
extending laterally across the hinged frame, the bolster sections
being positioned side by side to extend longitudinally along the
hinged frame.
15. The accessory system defined in claim 14 wherein the drive
means includes rollers mounted adjacent opposite ends of the hinged
frame, a drive belt around the rollers longitudinally along the
hinged frame, the bolster sections being disposed on and being
movable with the belt, and means for driving the belt
longitudinally along the bed.
16. The accessory system defined in claim 14 and further comprising
attachment means for securing a portion of the hinged frame to the
bed frame, tensioning means coupled to the drive belt for
maintaining the belt under tension as the elevation of the head
section is adjusted, and guide means on the hinged frame for
guiding the belt along an upper surface of the hinged frame.
Description
BACKGROUND OF THE INVENTION
Many modern hospitals have intensive-care-unit (ICU) facilities
where post-operative, critically ill or unconscious patients can be
kept under constant surveillance by nurses. It is normally
preferred that the upper part of the patient's body be elevated for
easier breathing and other medical reasons, and ICU beds are
therefore usually of a conventional type having a head section
which can be cranked up to raise the patient's head and shoulders.
An unfortunate by-product of this preferred elevated position is
that the patient gradually slides downwardly toward the foot or toe
end of the bed, and must be frequently repositioned by a nurse or
orderly. The patient must also be moved to use a bed pan, or when
bed linen is to be changed.
The problem of moving a bed patient is serious in ICU facilities as
most ICU patients are either comatose or unable to exert sufficient
muscular control to move themselves. These seriously ill patients
are awkward to move, not only because of normal body weight, but
also because great care must be taken not to interfere with
intravenous feeding tubes, drainage tubes, EKG cables, and similar
equipment attached to the patients.
ICU nurses are constantly faced with the problem of overexerting
themselves in repositioning patients who may weigh several hundred
pounds or more, and back strain is a common complaint from these
nurses. ICU surveillance should be maintained by highly skilled and
experienced nurses in view of the serious condition of ICU
patients, but hospital administrators find that the best-qualified
nurses shy away from these duties because of the muscle strain and
back problems arising from the physical exertion required to
reposition patients in their bed.
The bed here disclosed solves these problems as it provides
mechanical assistance for shifting, raising or turning a bed
patient. A mattress assembly for the bed is formed by a number of
bolsters or cushions which extend across the width of the bed, the
bolsters being positioned side by side so the resulting assembly
extends from the head to the foot of the bed. A motor-driven drive
belt extends along the length of the bed, and the bolsters are
connected to the belt. If the patient is to be moved toward the
head end of the bed, the drive-belt motor is actuated to move the
belt and bolsters mounted thereon in the desired direction. As an
end bolster moves past the head end of the bed, it is lifted off
the belt and replaced at a starting position on the belt at the bed
foot.
An ICU nurse is thus able to reposition a heavy patient by simply
pushing a button to actuate the belt-drive mechanism.
Alternatively, the drive motor may be omitted, and a simple
hand-crank drive is used to drive the bolsters along the bed. This
moving modular arrangement can be made as a complete bed, or as an
add-on accessory for installation on existing bed frames.
The bolsters are light and easily repositioned by the nurse, and
are covered by a slip-cover sheet which is quickly replaced when
fresh linen is needed. Any bolster in the series comprising the
mattress can be individually removed for a linen change, or to
provide a clear space beneath the patient for a bed pan, or for
improved air circulation over or access to a body area being
treated. One end of the bolsters can also be raised to assist in
turning the patient on his side.
SUMMARY OF THE INVENTION
This invention relates to a hospital bed having a frame with head
and foot ends, the head end being elevatable to raise an upper part
of the patient's body. A mattress is supported on the frame, and a
drive means on the frame is engageable with the mattress to move
the mattress longitudinally along the frame and upwardly along the
elevated head-end portion to reposition the patient on the bed.
Preferably, the mattress is formed from a plurality of separate
bolster sections, each of which includes a support tray and a body
of resilient material in the tray.
The drive means may include one or more drive belts extending
between rollers on opposite ends of the frame, and a motor or crank
drive to move the belts. A releasable fastener means or frictional
engagement couples the belt or belts to the bolster sections, and
the bolster sections are moved as a group toward an end of the
frame by operating the motor. When a leading bolster section
approaches a roller at one end of the frame, that section is
removed from the belt and replaced at the opposite end of the
frame. A limit switch is provided to prevent inadvertent overtravel
of the leading bolster. The bed may also include a power-operated
lifting means to raise one end of a selected bolster section, or to
tilt or raise the entire bolster section to aid in repositioning
the patient.
In one form the invention is incorporated in an accessory system
having a frame adapted for attachment to a standard hospital bed,
permitting conversion of existing equipment for ICU use. Also
disclosed is a bed-pan module which can be temporarily substituted
for one of the mattress bolsters.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevation of a hospital bed according to the
invention;
FIG. 2 is a top view of the bed;
FIG. 3 is a view on line 3--3 of FIG. 1;
FIG. 4 is a view on line 4--4 of FIG. 3;
FIG. 5 is a schematic diagram of a belt-drive system used in the
bed;
FIG. 6 is a schematic diagram of the bed electrical-wiring
system;
FIGS. 7-9 are schematic diagrams showing a sequence of events as
the bed is operated;
FIG. 10 is a plan view of a modified mattress-bolster carrier
useful with the invention;
FIG. 11 is a side elevation of the carrier taken on lines 11--11 of
FIG. 10;
FIG. 12 is an end view of a portion of the bed showing the
operation of the modified mattress-bolster carrier.
FIG. 13 is a side elevation of a conventional hospital bed and an
accessory movable-mattress system;
FIG. 14 is a top view of the accessory system;
FIG. 15 is a view on line 15--15 of FIG. 13;
FIG. 16 is a schematic diagram of a belt-driven system used in the
accessory system.
FIG. 17 is a front elevation of a bed-pan unit;
FIG. 18 is a side view of the bed-pan unit; and
FIG. 19 is a top view of the bed-pan unit.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A hospital bed 10 according to the invention is shown in FIGS. 1
and 2, and the bed includes a conventional main frame 11 with
longitudinal and lateral frame members 12 and 13 respectively.
Conventional tubular legs 14 are mounted at the four corners of the
main frame, and carry caster wheels 15 at their lower ends.
An upper mattress-supporting frame 18 is mounted above main frame
11 on a pair of upright brackets 19 secured to the central part of
each longitudinal frame member 12. The upper frame includes a pair
of first rails 20 pivotally secured to brackets 19 to permit the
head end of the upper frame to be elevated to raise the upper part
of the patient's body. A pair of second rails 22 extend from
brackets 19 toward the foot of the bed, and these rails may also be
pivotally secured to the brackets if it is desired to elevate the
lower part of the patient's body. Cross braces (not shown) extend
between the pairs of rails to form a rigid structure. The details
of this construction are omitted from the drawings as this style of
framework (and the mechanism for raising the frame sections) is
conventional in hospital beds.
A pair of main rollers 25 are mounted on opposite ends of the upper
frame, and each roller is rotatably supported by a pair of bearings
26 secured to the upper frame. A plurality of continuous drive
belts 27 extend between main rollers 25 along the length of the
upper frame. The undersurface of the upper part of each belt loop
is supported by a plurality of rigid metal panels 28 which are
secured to and extend between the upper surfaces of rail pairs 20
and 22.
A guide means including a set of three hold-down rollers 31 guides
belts 27 past the pivotal connection of first rails 20 to brackets
19. Two of the rollers are rotatably mounted in bearings (not
shown) secured to first rails 20, and the third roller is similarly
mounted to brackets 19. A lower guide roller 32 (FIG. 5 is also
rotatably mounted on brackets 19, and provides guidance for the
lower part of the drive-belt loops.
A main drive roller 34 extends between first rails 20, and is
rotatably supported in bearings 35 secured to the first rails. A
tension roller 36 is rotatably mounted on a pair of arms 37 which
are pivotally connected to first rails 20. A variable-length
element 38 such as a turnbuckle or spring is connected between the
lower end of each arm 37 and the frame, and element 38 is adjusted
to remove any slack from the belts. The overall arrangement of the
belts and various rollers is shown in schematic form in FIG. 5.
A drive motor 41 which includes a speed reducer is secured to the
upper frame on one of first rails 20 and associated cross braces.
This drive-motor speed-reducer assembly is of a conventional type
having an output shaft (not shown) connected to main drive roller
34 by a chain or belt 42. These components are covered by
sheet-metal shields which are omitted in the drawings for
clarity.
An electrical wiring diagram for drive motor 41 is shown in FIG. 6.
One terminal of a pair of power-input terminals 45 is connected to
a common terminal 46 on the motor. The other power-input terminal
is connected through a pair of limit switches 47 and 48 (described
below) to the arm of an SPDT operate switch 49. The fixed contacts
of the operate switch are connected to a forward terminal 50 and a
reverse terminal 51 respectively of the drive motor. With limit
switches 47 and 48 in their normally closed positions, the operate
switch (which may be mounted at any convenient location on the bed)
is actuated to drive the motor in either a forward direction
(moving the upper surface of the drive belts toward the head end of
the bed) or a reverse direction.
A mattress 53 for the bed is formed from a plurality of mattress
sections or bolsters 54 which are elongated
rectangular-cross-section blocks of a resilient material such as
foam rubber. Each bolster is covered by a slipcover sheet made of a
material such as cotton cloth. Alternatively, the slipcover may be
made of sheepskin or a synthetic decubitus-pad material. A metal
tray 55 with upturned edges receives each bolster 54 and serves to
couple the bolsters to belts 27.
The outer surface of each drive belt 27 includes a body of pile
fastener material 57 such as sold under the trademark "Velcro."
Mating strips of hook material 58 of this type are secured to the
undersurface of each tray 55 as best seen in FIG. 3. The tray and
associated bolster are thus connected to the drive-belt system
simply by pressing the tray against the belts to engage the hook
and pile sections of this fastener material. Other types of
fastening means can of course be used to connect the trays to the
drive belts.
Limit switch 47 is mounted on the undersurface of one of metal
panels 28 adjacent the foot end of the bed (FIGS. 3 and 4). This
switch has an upwardly extending roller-carrying arm 60 which is
urged upwardly through an opening 61 in the panel. If a bolster is
present above the switch, arm 60 is depressed by associated tray 55
to close the switch. If no bolster is present above the switch, the
switch arm moves upwardly to a position which opens the switch
contacts and prevents operation of drive motor 41. Limit switch 48
is similarly arranged at the head end of the bed, but his switch is
of a normally closed type. That is, the contacts of switch 48 open
to disable drive motor 41 only when a bolster and associated tray
move over the switch to depress the switch arm.
Operation of the bed is shown in schematic form in FIGS. 7-9. In
FIG. 7, upper frame 18 has been loaded with eight mattress bolsters
54 designated a-h, and associated trays. If a patient resting on
the mattress slides downwardly toward the foot end of the bed,
drive motor 41 is actuated by switch 49 to drive the bolsters in a
forward direction (toward the head of the bed) to move the patient
back to a desired position. This transport of the mattress sections
can be continued until the bolsters reach the position shown in
FIG. 8 where the limit switches open to disable the drive motor and
thus to prevent overtravel of the bolsters. Bolster h at the head
end of the bed is then removed by pulling its associated tray away
from the drive belts, and this bolster is replaced in the
now-vacant space at the foot of the bed as shown in FIG. 9. The
patient can thus be moved upwardly in the bed simply by actuating
the drive switch, and periodically moving the leading bolster back
to the foot end of the bed.
A continuous mattress can also be used to eliminate manual transfer
of individual bolster elements, but the bolster construction is
preferred for its mechanical simplicity, and also because soiled
bolster covers can be individually replaced without changing all of
the bed linen. Another advantage of the bolster construction is
that a single bolster can be removed from beneath the patient's
hips to permit use of a bed pan, or to provide access to the
underside of the patient's body. The individual bolsters are light
and easy to handle for a nurse, and replacement of a bolster cover
is readily accomplished.
Another advantage of the individual bolsters is made possible by a
modified bolster tray 65 (FIGS. 10-11). This tray is generally
similar in shape to tray 55 in that it has a flat base panel 66
with upwardly turned edges 67 to receive a bolster 54. Tray 65,
however, includes a pair of movable panels 68 pivotally mounted by
hinges 69 on opposite sides of the tray centerline. An opening 70
is formed through each end of base panel 66.
A pair of lifting means such as electrically operated jackscrews 72
(FIG. 12) with drive motors 73 are used in connection with tray 65,
and the drive motors are secured by brackets 74 to the rails of
upper frame 18. For example, one pair of jackscrews can be mounted
to rails 20 spaced slightly from rails 22 toward the head end of
the bed, and another pair of jackscrews can be mounted on rails 22
slightly toward the foot of the bed from rails 20. A pad 75 is
mounted by a ball-socket fitting at the top end of each
jackscrew.
If it is necessary to turn the patient in the bed, the jackscrews
on one side of the bed are actuated to raise one end of the
associated bolsters as shown in FIG. 12. The patient is turned as
the bolster ends are elevated, and manual effort required to
reposition the patient is considerably reduced. When the jackscrews
are used in this mode, the bolsters are positioned by drive belts
27 to place openings 70 immediately above the jackscrews so pads 75
can contact hinged panels 68 to raise the bolster end.
The jackscrews are also useful to tilt a pair of bolsters c and e
as shown schematically in FIG. 9. In this mode, the trays are
positioned so pads 75 contact the solid undersurface of base panel
66 at one side of opening 70. The associated bolsters are then
tipped upwardly to raise the patient's hips, and thus to enable
ready removal of bolster d. A bed pan can then be easily moved into
position beneath the patient without any extra exertion on the part
of either the nurse or the patient. The tray is also readily
adapted for manual operation by levers or cranks if power
assistance in raising or turning the patient is not considered
necessary in a particular application of the bed.
An alternative form of the invention is shown in FIGS. 13-16 which
illustrates an add-on accessory movable-mattress system 90 useful
for converting a conventional hospital bed 91 to incorporate the
advantages of the invention. Bed 91 is of a standard style having
an articulated bed frame with an elevatable head-end portion 92 and
a hinged foot-end portion 93 which can also be elevated. The usual
cranks or drive-motor mechanisms for elevating these frame portions
are omitted in the drawings.
Accessory system 90 (which is shown lifted above bed 91 in FIG. 13
for clarity) includes a frame 96 made of metal channels, and having
a head section 97, central section 98, and foot section 99. These
sections are pivotally connected by pins 100 so the several
sections can be hinged up or down to conform to the elevation of
bed 91. The top of each frame section is covered by a panel 101
which extends across the width of the section.
Retaining flanges 103 (FIGS. 13 and 15) extend downwardly from
sections 97-99 of frame 96 to overlap the angle-iron frame of bed
portions 92 and 93. These flanges anchor accessory system 90
against sideways movement on bed 91. Flanges 103 on head section 97
include clamp screws 104 which are tightened against the frame of
bed 91 so the head section is also locked against longitudinal
movement with respect to head-end portion 92. Central and foot
sections 98 and 99 are free to slide along foot-end portion 93 to
accommodate changes in the frame geometry as the various movable
portions of the bed are elevated.
A continuous and flexible drive belt 107 (which may be canvas)
extends along the length of accessory system 90 between a drive
roller 108 rotatably mounted adjacent the end of head section 97
and a return roller 109 rotatably mounted adjacent the end of foot
section 99. A drive means such as a crank handle 110 is connected
to drive roller 108, and the crank handle and drive roller
connection may include gearing and rachet locks (not shown) so the
belt can normally be driven only clockwise as viewed in FIG. 13. If
a rachet is used, it should preferably be of a releasable type
permitting reverse drive of the belt if desired.
As shown schematically in FIG. 16, a number of guide rollers 113
extend across accessory system 90 between rollers 108 and 109 to
insure proper tracking of belt 107. A tensioning roller 114 is
movably mounted, and is urged by a tension spring 115 into a
position which keeps the drive belt taut.
A plurality of mattress bolsters 54 as described above are
positioned along the top of accessory system 90 to rest on drive
belt 107. When the belt is driven by rotating roller 108, the
bolsters are driven toward the elevated head end of the bed to
reposition a patient as already discussed. There is sufficient
frictional engagement between the bolsters and the wide drive belt
that no special coupling is necessary between these components.
Preferably, the upper end of head section 97 is lengthened to form
a platform 118 to accommodate and temporarily hold the uppermost
bolster as the patient is being repositioned. An accordian-like end
section 119 is preferably secured at the outer end of foot section
99 to hold the bolsters at the foot end of the bed in position. End
section 119 has internal springs 120 which are compressed to
compress the end section when a bolster removed from the head end
is being replaced at the foot end of the movable-mattress
system.
Accessory system 90 is advantageous in that it can be added to
existing hospital beds to provide the patient-conveyance features
of the invention. Installation and removal is straightforward,
permitting conversion of standard beds for either ICU use or
ordinary ward use depending on the nature of the patient load being
carried by the hospital.
FIGS. 17-19 show a bed-pan unit 125 which is useful with either of
the embodiments of the invention described above. Unit 125 is
channel shaped, and is formed from two halves 126 and 127 each
having a top panel 128 and a pair of downwardly extending legs 129
along opposite side edges of the top panel. The length and height
of the abutted halves are substantially the same as the
corresponding dimensions of bolster 54, and the width of the halves
equals the width of the bolster or a multiple of such width. That
is, the halves may, for example, span the width of two adjacent
bolsters. An opening 130 is formed in the inner end of the top
panel 128 of each half, and a raised partial seat 131 extends
around the opening.
In use, the patient is turned slightly so one of halves 126 and 127
can be slipped over the bolster (or bolsters) beneath the patient's
buttocks. The patient is then turned slightly in the opposite
direction, and the other half is similarly installed from the
opposite side of the bed to abut the inner end of the first half.
The assembled halves thus form a complete seat beneath the patient,
and the bolster (or bolsters) beneath the halves can now be slipped
out as the patient is supported by unit 125. With the bolster thus
removed, an open space is available beneath top panels 128 and
between legs 129 for insertion of a bed pan beneath opening
130.
A presently preferred arrangement for the bed pan comprises a ring
132 having an outside dimension slightly smaller than that of
opening 130. A pair of support arms 133 extend from opposite ends
of ring 132, and the outer ends of the arms form hooks 134 which
fit over the edges of top panels 128 as shown in FIG. 17. One of
the hooks is hinged to act as a releasable latch fitting over the
adjacent edge of the top panel.
A conventional solid bowl-shaped bed pan (not shown) can be fitted
into ring 132, but preferably a disposable transparent plastic bag
135 is secured around the edges of the ring to extend downwardly
through the ring as shown in FIG. 18. The bag preferably has a
self-adhesive lip to permit quick and simple fastening in place.
After the bag is installed, the ring is slipped into the open space
beneath top panels 128, and hooks 134 are engaged with the top
panel edges to raise ring 132 and the upper end of bag 135 into
opening 130 beneath the patient's buttocks.
After use, the bed-pan unit is slipped out from beneath top panels
128, the bag is removed from ring 132 and sealed, and the bag
contents may be weighed or checked for appearance as is often
required with seriously ill patients. The mattress bolster (or
bolsters) is then replaced beneath the bed pan units, and halves
126 and 127 are removed.
Bag 135 is preferably a transparent polyvinyl-alcohol plastic which
dissolves when immersed in water at a temperature of about
140.degree.F. When this material is used, the bag can be discarded
in a toilet which has a hot water supply, and the bag will dissolve
harmlessly without blocking the toilet plumbing.
There has been described a hospital bed system which is
particularly suited for use in intensive care units where patients
are usually unable to assist themselves when repositioning on the
bed is required. The bed eliminates a major part of the manual
effort normally required by ICU nurses to reposition a patient, and
the long standing problems of fatigue and back strain often
encountered by these nurses is solved.
* * * * *