Note: Descriptions are shown in the official language in which they were submitted.
CA 02640309 2015-03-30
WASTE DISPOSAL DEVICES
FIELD OF INVENTION
This invention relates generally to waste disposal devices using flexible
tubing
and, more particularly, to improved waste disposal devices for use in sanitary
and
odorless packaging and disposal of medical waste (such as, for example,
gloves, gauze
or any other waste which occurs in, for example, a doctor's office or
hospital), industrial
waste, diapers and any 'other waste wherein sanitary and/or substantially
odorless
disposal is desired.
BACKGROUND OF THE INVENTION
Small waste disposal devices are common in hospitals, doctors' offices and
other
locations where waste is generated and must be disposed of in a sanitary
manner.
Further, if the waste emits odors, the waste disposal device should also
contain odors
emanating from the waste.
Several waste disposal devices are disclosed in U.S. Pat. No. 6,612,099,
6,804,930, 6,851,251 and 7,146,785_
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of some embodiments of the present invention to provide new
and
improved -waste disposal devices, in particular far use in the disposal of
disposable
medical wastes, industrial waste and diapers..
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It is another object of some embodiments of the present invention to provide
improved waste disposal devices for the medical and health care industries for
use in,
for example, hospitals, doctors' offices, operating rooms, nursing homes, out-
patient
care and the home health care industry for disposal of non "sharps" including
adult
diapers, bloody/soiled bandages, dressings, disposable bibs, "chucks" and
clothing,
medical gloves and dialysis machine filters and other disposal medical waste.
In order to achieve at least one of these objects and others, a waste disposal
device in accordance with the invention includes a container defining a waste
chamber
for receiving waste, a support member arranged in the container for supporting
tubing
having a closed or closable front end to thereby enable formation of a bag in
the
container, and a twisting assembly arranged in the container and defining an
aperture
through which the tubing passes while the twisting assembly engages with the
tubing.
The tubing support member is stationary and a rotation mechanism is provided
to rotate
the twisting assembly relative to the stationary support member while the
twisting
assembly engages with the tubing to thereby form a twist in the tubing..
The rotation mechanism is preferably actuated after each waste insertion to
form
a twist after the waste is inserted and thereby prevent odors from the
inserted waste
from leaving the container. For example, the rotation mechanism may be
actuated
upon closure of the lid so that whenever the lid is closed, a twist is formed
above the
inserted waste.
The twisting assembly may have different forms, its essential purpose being to
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interact with the rotation mechanism to receive rotational force therefrom and
interact
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with the tubing to grasp it so that when the twisting assembly is rotated, the
grasped
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tubing is also rotated, relative to the stationary support member which causes
the
formation of the twist in the tubing,
BRIEF DESCRIPTION OF THE DRAWINGS
The invention, together with further objects and advantages thereof, may best
be
understood by reference to the following description taken in conjunction with
the
accompanying drawings, wherein like reference numerals identify like elements,
and
wherein:
FIG 1 is perspective view of a waste disposal device in accordance with the
invention shown in an open position and with a first type of tubing support
member
shown separated from the device.
FIG. 2 is perspective view of a waste disposal device in accordance with the
invention shown in an open position and with a second type of tubing support
member
shown separated from the device.
FIG. 3 is perspective view of a waste disposal device in accordance with the
invention shown in an open position with the tubing support member in its
operational
position
FIG.. 4 is a view through an access door of the waste disposal device in
accordance with the invention
FIG. 5 is a perspective view of a portion of the waste disposal device in
accordance with the invention..
FIG. 6 is an enlarged, top perspective view of a membrane of a twisting
assembly used in a waste disposal device in accordance with the invention.
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FIG. 7 is an enlarged, bottom perspective view of a membrane of a twisting
assembly used in a waste disposal device in accordance with the invention.
FIG. 8 is a view, partly broken away of a second embodiment of a waste
disposal
device in accordance with the Invention.
FIG, 9 is a top perspective view of another embodiment of a twisting assembly
for use in waste disposal devices in accordance with the Invention.
Fla 10 Is a bottom perspective view of the twisting assembly shown in FIG. 9
FIG. 11 shows the inside of a bag formed from the tubing In accordance with
the
invention.
Fla 12 shows an exterior view of the bag of FIG. 11,
FIG. 13 is a partial view of the upper portion of the bag of FIG. 11.
FIG. 14 shows a handle formed from the tubing support member.
DETAILED DESCRIPTION OF THE INVENTION
Referring to the accompanying drawings wherein like reference numerals refer
to
the same or similar elements, FIGS. 1-5 show a first embodiment of a waste
disposal
device in accordance with the Invention which is designated generally as 10
and Is, to
some extent a modificatior of the waste disposal device shown in FIGS. 413-49
of U.S.
Pat. No. 7,146,785. Thus, any features and functions not specifically
mentioned below
may be understood by reference to the disclosure of this waste disposal device
in the
'785 patent.
Waste disposal device 10 includes a substantially cylindrical container 12
having
an outer wall and a. base arranged at the lower end of the outer wall. An
access door is
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formed in the outer wall and pivots about hinges to enable access to an
interior waste-
receiving chamber of the container 12 in which a pail may be placed to receive
a bag
which will be filled with waste during use of the waste disposal device 10. A
closure
mechanism is provided to secure the door in a closed position. A lid 14 is
pivotally
connected to the outer wall so as to be movable between an open position in
which a
waste insertion opening is exposed to enable insertion of waste into the
container 12
and a closed position in which the lid 14 overlies and closes the waste
insertion
opening.
A general feature of waste disposal device 10, and other waste disposal
devices
disclosed herein, is that there is rotation of a mechanism which engages with
the tubing
relative to a stationary support or cartridge which supports or retains the
tubing into
which the waste is placed to thereby cause the formation of a twist in the
tubing.
Rotation of this mechanism would occur after insertion of waste to thereby
form a twist
above the inserted waste and inhibit release of odors from the waste.
To implement this technique, a twisting assembly 16 is movably seated on a
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support flange 18 of the container 12 and includes a twisting member 20.
Twisting
member 20 includes a substantially tubular outer wall 22, a substantially
tubular inner
wall 24, a substantially planar bottom support wall 26 and a circular gear rim
28
adjoining the outer wall 22 and on which projections 30 are formed (see FIG.
5). The
bottom support wall 26 is not contiguous between the outer and inner walls 22,
24 and
apertures may be formed therein (see FIG 4). The gear rim 28 and its
projections 30
may be formed integral or unitary with the twisting member 20 or separate
therefrom
and then attached thereto.
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The twisting assembly 16 also includes a grasping member such as a membrane
32 arranged to engage with tubing. When the twisting assembly 16 is rotated,
the
engagement of the membrane 32 with the tubing causes the tubing to be twisted,
i.e.,
form a twist in the tubing. The engagement of the tubing with the membrane 32
arises
since the tubing passes through one or more of the slots 34 between fingers 36
of the
membrane 32 (see FIGS. 6 and 7).. The slots 34 define an aperture through
which the
tubing passes. Note that the tubing may pass through only one slot 34, or only
partially
through one slot, or only partially through two or more slots, or only through
the center
at the intersection of the slots, and the exact manner depends on the actual
use of the
waste disposal device 10.
An aperture, through which the tubing passes, may be formed in the membrane
32 by other means, including, barely discernible small slits extending from a
frame
supporting the outer edge of the membrane 32 to a center.
The membrane 32 may be formed and constructed in different ways and is not
limited to the presence of six fingers 36 separated by slots 34 as in the
illustrated
embodiment. The material of the fingers 36 may be selected to be flexible so
that they
flex downward in a direction away from the center when a person pushes waste
through
the central region of the membrane 32 The material of the fingers 36 should
also be
resilient so that the fingers 36 return to their initial form after the person
has removed
their hand from engagement with the membrane 32, or the inserted waste has
been
pushed downward through the membrane 32 and is no longer in engagement
therewith.
For example, the membrane 32 may be made of silicone or another rubbery
material. It may also be made of a flexible synthetic material which flexes
under
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pressure and returns when pressure is removed. The tubing passing through the
slots
34 may tend to flex the fingers 36 downward but the fingers 36 will still
remain in
engagement with the tubing and enable it to be twisted in the manner described
below
upon rotation of the membrane 32
The edges of the fingers 36 which are expected to engage the tubing may be
provided with a friction-enhancing material to increase the contact force
between the
fingers 36 and the tubing.
Membrane 32 may be formed integral with the twisting member 20 or separate
therefrom and then attached thereto.. For example, as shown in FIG, 7, the
membrane
32 may include an annular channel on its underside which frictionally engages
with an
annular projection on the twisting member 20. Friction between the projection
on the
twisting member 20 and the edges of the channel on the membrane 32 enables the
membrane 32 to be securely retained on the twisting member 20 and thus rotated
upon
and in conjunction with rotation of the twisting member 20. Any other
structure for fixing
the membrane 32 to the twisting member 20 to enable them to rotate together
may also
be used
Instead of the membrane 32, another form of a grasping member may be used,
The general function of such a grasping member is to engage with the tubing as
the
tubing passes by it and is capable of twisting the tubing when rotated. For
example, the
grasping member may be a circular frame having fingers extending inwardly
therefrom,
or have the structure disclosed in the above-mentioned patents.
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A rotation mechanism 38 is provided to rotate the twisting assembly 16, and
may
have the form shown in FIGS. 43-49 of the '785 patent or in any of the other
embodiments shown or disclosed therein, or in the above-mentioned patents.
For example, the rotation mechanism 38 in the illustrated embodiment includes
an elongate rack gear 40 attached to the lid 14 and having a series of teeth
on at least a
portion of a longitudinally extending surface, and a gear assembly 42 arranged
on the
container 12 (see FIG 5) The upper end of the rack gear 40 includes a slot 44
in which
a pin 46 mounted to projections 48 on the inner side of the lid 14 moves. As
the lid 14
is closed, the pin 46 moves forward in the slot 44 and forces the rack gear 40
downward.
Gear assembly 42 includes a plurality of gears, one of which is in meshing
engagement with the rack gear 40, one of which is in meshing engagement with
the
projections 30 on the rim gear 28 of the twisting member 20 (which gear is
referred to
as a drive gear), and one or more optional intermediate gears which transfer
the rotation
of the gear meshing with the rack gear 40 to the drive gear. Gear assembly 42
also
includes an appropriate mechanism for enabling one-way transmission of
rotational
force from the rack gear 40 to the drive gear.. Such mechanisms are disclosed
in the
785 patent Other gear assemblies including more or less gears than shown can
also
be used to convert the downward movement of the rack gear 40 into rotational
movement of the drive gear in only a single direction For example, a bevel
gear may be
used.
Thus, in operation, when the lid 14 is closed, the rack gear 40 is moved
downward causing rotation of the gears in the gear assembly 42 and ultimately
rotation
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of the drive gear. The twisting member 20 is thus caused to rotate in view of
the
engagement between the projections 30 on the gear rim 28 and the drive gear.
As such,
the dosing movement of the lid 14 is converted into rotational movement of the
twisting
member 20
Other mechanisms for converting movement of the lid 14 (whether closure of the
lid 14 or opening of the lid 14) into rotational movement of the twisting
member 20 are
also contemplated within the scope of the invention and include those rotation
mechanisms described in the '785 patent.
An alternative rotation mechanism is shown in FIG, 8 and may include a motor
72 actuated by a pushbutton 74 to cause a drive gear 76 of the motor 72, and
which is
in meshing engagement with the projections 30 on the rim gear 28, to rotate
and
thereby cause rotation of the twisting assembly 16. The motor 72 may be fixed
to the
container 12, e.g., to the side wall thereof. Although the pushbutton 76 would
only be
accessible when the lid is open 14, it is also possible to place the
pushbutton on the
outer surface of the container 12 or lid 14 so that it is depressible even
when the lid 14
is closed.
Additional rotation mechanisms are disclosed in the '785 patent which do not
require actuation based on closure of the lid 14 or pressing a button. For
example, a
motor may be provided and a sensor system provided which detects insertion of
waste
and thereafter causes actuation of the rotation mechanism
A cartridge 50 of flexible tubing is arranged in an annular cavity 52 defined
by the
outer wall 22, inner wall 24 and bottom support wall 26 of the twisting member
20,
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Cartridge 50 is seated in the cavity 52 so that the twisting member 20 can
move while
the cartridge 50 remains stationary.
In order to provide for rotation of the twisting member 20 relative to the
stationary
cartridge 50 and thus the formation of a twist in the tubing in the slot(s) 34
between the
fingers 36 of the membrane 32 (and which is engaged by the fingers 36), a
mechanism
for preventing rotation of the cartridge 50 is preferably provided. The anti-
rotation
mechanism or rotation preventing mechanism may be as in any of the embodiments
described in the '785 patent. For example, cartridge 50 could be provided with
a
plurality of indentations, e.g., four, six, eight, that receive projections on
the housing of
the container 12 (see FIG 3 wherein such projections extend inward from the
inner
surface of the container 12 above the annular ledge on which the gear rim 28
rests)
Prior to use, the waste disposal device 10 is prepared by inserting the
cartridge
50 and pushing a closed, front end of the tubing through the slots 34. Then,
in use, the
lid 14 is opened to expose the waste insertion opening.. A load of waste is
placed
through the membrane 32, which is possible in view of the flexibility of the
fingers 36
and the presence of the slots 34 therebetween, and into a bag formed by the
flexible
tubing in cartridge 50. The lid 14 is then closed causing the rack gear 40 to
rotate the
gear assembly 42 and ultimately the drive gear Rotation of the drive gear,
which is in
meshed engagement with the projections 30 on the gear rim 28 of the twisting
member
20, will cause rotation of the twisting assembly 16.. Rotation of the twisting
assembly 16
while the tubing passes through the slot(s) 34 of the membrane 32 and engages
therewith will cause the tubing to be twisted and thereby form a twist above
the inserted
waste
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Successive waste insertions would be placed into the bag formed by the tubing
in
a similar manner Although any previously formed twists may not be maintained
and
the tubing may untwist, the formation of a new twist will effectively serve to
seal in any
odors and close the bag anew after each waste insertion, The twist is not
intentionally
untwisted since the membrane 32 is prevented from rotating in the opposite
direction in
view of the construction of the gear assembly 42 or another part of the
rotation
mechanism. The end result will be the presence of a bag formed by the tubing
and
including numerous waste insertions altogether in a common space defined by
the bag.
Thus, there will not be a series of encapsulated waste packages.
Another embodiment of a twisting assembly is shown in FIGS. 9 and 10 and is
designated generally as 56 Twisting assembly 56 defines a cavity 58 into which
the
cartridge 50 may be placed Twisting assembly 56 includes a twisting member 60
having a tubular outer wall 62, a tubular inner wall 64 and a bottom support
wall 66. A
series of projections 68 are formed on the underside of the bottom support
wall 66 (see
FIG 10) A grasping member such as membrane 32 is attached to the twisting
member
60 and more specifically, above the inner wall 64 and held in place by
retention springs
70 situated inward of the projections 68, and preferably around the entire
circumference
of the membrane 32. Other means for holding the membrane 32 in connection with
the
twisting member 60 may also be used, including those discussed above.
In this embodiment, the drive gear of the gear assembly 42 or the drive gear
76
connected to the motor 74 would engage with the projections 68 so that
rotation of the
drive gear would cause rotation of the twisting member 60 and thus the
membrane 32
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attached thereto The cartridge 50 would be held stationary by any appropriate
anti-
rotation mechanism, for example, those disclosed in the '785 patent.
This embodiment can also be used with an alternative rotation mechanism which
includes a U-shaped rack gear assembly. The U-shaped rack gear assembly
includes a
U-shaped frame which is coupled to the lid 14 at the upper ends of the U-shape
and a
rack gear on the inside surface of one leg of the U-shaped frame. The rotation
mechanism includes a gear assembly having one gear in meshing engagement with
the
rack gear and one gear in meshing engagement with the projections 68 (the
drive gear),
and then optionally one or more gears interposed between the gear in
engagement with
the rack gear and the drive gear.
The cartridge 50 may be formed as shown in FIGS 13A-13E of the '785 patent
However, it is envisioned that the stack of tubing in the cartridge 50 would
not be the
same size as that in the cartridges shown in the '785 patent because by
avoiding
forming a series of encapsulated waste packages, significantly less tubing is
required
Rather, the amount of tubing necessary may only be slightly larger than the
height of
the container 12,
In one embodiment, the tubing is formed to have a wider cross-sectional area
in
that portion which will be situated in the waste-receiving chamber of the
container 12
than in the area around the cartridge 50 itself (see FIGS_ 11 and 12).. This
may be
accomplished by bunching up the tubing at the cartridge 50
The cartridge 50, without the tubing, may be formed entirely of cardboard or
plastic or another material and designed to be foldable about a linear
weakened region,
e.g., a score line, to allow for folding of a part of the cartridge 50 onto
itself. In this case,
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the cartridge 50 could be used as a handle for the bag of waste formed by the
insertion
of the waste into the tubing during use of the waste disposal device 10. After
the
container 12 is full of waste, the cartridge 50 would be folded about the
weakened
region and the handle inserted through the membrane 32 so that the handle can
be
grasped upon opening the access door. The bag of waste is therefore easily
handled
and disposed of into a larger waste container.
In one embodiment, it is envisioned that the cartridge 50 would not have a
stack
of flexible tubing but rather only a bag (tubing with a closed, front end)
would be
attached at the open end to the cartridge 50 and may be entirely extended into
the
container 12 prior to the first use of the waste disposal device 10. This bag
may be
formed as described above with a wider cross-sectional area in that portion to
be situate
din the waste-receiving chamber of the container 12 and a smaller cross-
sectional area
around the cartridge 50. As such, the cartridge 50 may be considered as a
tubing
support member In this case, the tubing support member 54, shown in FIG. 2,
may
include only upper and lower annular walls, possibly having the same
dimensions, and
the rear end of the tubing retained between the upper and lower walls. These
upper
and lower walls may be formed entirely of cardboard. Alternatively, a tubing
support
member 54 may include only a single wall which supports the rear end of the
tubing.
The front end of the tubing is closable or closed to thereby enable the
formation of a
bag in the container 12
FIGS 11-14 show additional details of a tubing assembly 78 in accordance with
the invention which includes a tubing support member 54 and tubing 80 FIG. 11
shows
the inside of a bag 82 formed from the tubing 80 having a twist 84 and a
plurality of
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waste insertions 86 The rear edge of the tubing 80 is fixed between a pair of
circular
supports 88 forming the tubing support member 54 Note that a single circular
support
may be provided and the tubing attached to this singular circular support. The
circular
supports 88 have substantially the same outer dimensions and substantially the
same
size aperture therein Also, the circular supports 88 may be attached directed
to one
another along an outer periphery while the tubing 80 is sandwiched between the
circular
supports 88 along their inner periphery
FIG 12 shows what the bag 82 would appear like when viewed from the outside
FIG. 13 is a partial view of the upper portion of the bag 82 showing the
weakened
sections 90 on the circular supports 88
FIG 14 shows the formation of a handle 92 from the circular supports 88 after
they are folded about the weakened sections 90. The folded portions of the
circular
supports 88 may be attached together to form the handle 92 using any type of
connection means, e.g.., hook and loop-type fasteners and adhesives. In the
latter
case, an arcuate strip of adhesive with a removable cover strip may be applied
to the
upper surface of the circular support 88 on one side of the weakened sections
90 and
then when it is desired to form the handle 92, the cover strip is removed and
the
adhesive exposed and adhered to the upper surface of the circular support 88
on the
other side of the weakened sections 90.
The length of the tubing 80, i.e., the extension of the bag 82 from the region
around the supports 88 to the front closed end of the bag 82, may be in a
range from
about 22 inches to about 36 inches. This length, which substantially
corresponds to the
height of the bag 82 formed from the tubing 80, may depend on the height of
the
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container 12, and for this range, it assumed to be about 22-24 inches. Of
course, for a
larger container 12, a larger bag 82 would be used, i.e., a larger length of
tubing 80
would be attached to the supports 88.
It is contemplated that the tubing support member 54 and attached tubing 80
would have a single use construction and would be disposed of when desired,
regardless of whether the bag 82 formed from the tubing 80 is full or not.
In its sale condition, the tubing support member 54 may have the tubing 80
folded and attached thereto The user would then have to place the tubing
support
member 54 into the cavity in the twisting assembly 16, 56 and then push the
closed
front end of the bag 82 formed from the tubing 80 into the interior of the
container 12
The tubing 80 may either be formed with a closure at the front end, as
disclosed in the
'785 patent, or require the user to manually tie the front end of the tubing
80 into a knot.
In the latter case, the height of the tubing 80 may be larger than the height
of the
container 12 to allow for the formation of the knot at the front end.
Waste disposal device 10 may be used for any type of waste, including but not
limited to medical waste from hospitals, doctors' offices, home health care
personnel
and facilities, nursing homes, biohazard laboratories, and the like The waste
disposal
device 10 may also be used for personal hygiene such as for disposing of
soiled
diapers
An advantage of the invention over waste disposal devices, such as disclosed
in
the '785 patent, and which are used to form a series of encapsulated waste
packages is
that significantly less tubing is used since each waste insertion is not
individually
encapsulated. Rather, there is a common bag formed from the tubing and
multiple
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;
waste insertions are placed into this bag Since less tubing is required, the
cartridge 50
may be quite thin In comparison to cartridges used in waste disposal devices
that form a
series of encapsulated waste packages_
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