Protective underwear made of air-tight polyurethane-coated nylon
(10) with elastic sewn around the waist (12) and around the bifurcated
legs (14a, 14b). An exit hole (24) for the flatus is cut from the
back, near the bottom, of the underwear. The exit hole is covered
with a pocket (16a, 16b) made of porous fabric, and designed in
the same shape as the exit hole (24), only larger. The bottom layer
of the pocket (16b) is sewn (22) around the edge of the exit hole
(24) connecting it to the underwear. The top layer (16a) is sewn
(20) around the edge of the bottom layer (16b) and onto the underwear,
except at the top, leaving the pocket opening. The pocket opening
is kept closed by a fastener. The replaceable filter is large all
around than the exit hole (24), but smaller all around than the
pocket (16). The top and bottom layers are of wool felt (26a, 26b);
and both layers are cut larger than all other layers to facilitate
sewing (28). The second layers, on top and bottom, are of polypropylene
non-woven fabric (30a, 30b); followed by layers, top and bottom,
of fiber glass wool (32a, 32b). In the middle of the filter is a
single layer of activated carbon (34).
1. A protective underwear comprising:
a bifurcated vinyl-covered underwear with elastic bands around
the waist and legs, a hole in a lower back area of the underwear
in the shape of a modified triangle and
a pocket of porous fabric shaped in a triangle larger than said
hole, having a front and back piece sewn onto an edge of said hole
leaving an opening with a fastener at the top of said front piece;
a filter in the shape of said triangular hole larger than said
hole and smaller than said pocket, comprising an outer top and bottom
layer of wool felt followed by an inner top and bottom layer of
unwoven polypropylene fabric followed by an inner top and bottom
layer of fiber glass wool followed by an inner most single layer
of activated carbon on an open cell foam base, and sewn together
at an edge of said layers.
BACKGROUND OF INVENTION
This invention relates to protective underwear, specifically to
the filtering of foul smelling human flatus.
BACKGROUND OF THE INVENTION
Heretofore, the health care industry has provided protective underwear
for individuals suffering from urine and feces incontinence. However,
for those millions suffering from inflammatory bowel diseases, such
as Crohn's disease and ulcerative colitis, no protective underwear
are available to filter the malodorous flatus that accompany these
Some protective underwear are air tight but provide no relief from
foul human gas, especially for that segment of the United States
population experiencing lactase deficiency or diverticulitis.
OBJECTS AND ADVANTAGES
Accordingly, several objects and advantages were created in this
protective underwear. First, the polyurethane coated nylon underwear
has elastic around the waist and bifurcated legs, but with a triangular
hole cut from the material in the back near the bottom where the
anus would normally release the flatus. This triangular hole has
rounded corners, and has the purpose of facilitating the exiting
of the flatus in a specific area and direction in the otherwise
Second, covering the hole from the inside, a pocket is attached
to the polyurethane coated nylon close to the edge by needle and
thread. This pocket is noticeably larger than the hole and is made
of a porous fabric. It is also triangular shaped with rounded corners,
and has fasteners of the hook and loop type sewn into the top for
easy opening and closing.
Third, a multi-layered gas filter is placed in the pocket. The
filter is the same shape, but slightly smaller, then the pocket,
and slightly larger than the exit hole. The filter is replaceable
and can be removed from the underwear when laundering, or replaced
And, whereas prior inventions provide for the health problem of
incontinence, this invention provides relief from many of the problems
associated with Inflammatory Bowel Syndrome (I.B.S.), lactase deficiency,
and diverticulitis. Further advantages of my invention will become
apparent from a review of the drawings and detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1A and 1B show a perspective view of the protective underwear
with the replaceable filter.
FIG. 2 shows a rear view perspective of the protective underwear.
FIG. 3 shows the protective underwear with the exit hole cut out,
and the elastic around the waist and bifurcated legs.
FIGS. 4A and 4B show a perspective view of the pocket with fasteners,
and the top and bottom layers of the pocket from the inside view.
FIG. 5 shows the stratified filter in layers.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A typical embodiment of the Protective Underwear for Malodorous
Flatus is illustrated in FIG. 1A (perspective view) witch the replaceable
filter in FIG. 1B. The bifurcated underwear is primarily made of
vinyl-coated nylon 10, with a 1 inch elastic band 12 sewn around
the waist and a 1/2 inch elastic band 14 sewn around each of the
As illustrated in FIG. 3, a hole 24 is cut from the underwear at
the lower back area where the flatus is normally expelled. The hole
is in the shape of a modified triangle with rounded corners. The
hole is covered with a pocket 16 shown in FIGS. 4A (perspective
view) and 4B (top and bottom layers), shaped larger than the exit
hole, and made of porous fabric.
The bottom layer 16b of the pocket is connected to the vinyl-coated
nylon 10 at the exit hole 24 by a sewing stitch 22 as seen in FIG.
4B. Also, the bottom layer is attached to the underwear with a stitch
17b connecting a fastener 18b to the bottom layer.
The top layer 16a of the pocket is connected to the bottom layer
of the pocket 16b and the vinyl-coated nylon 10 by a sewing stitch
20. Also sewn to the top layer of the pocket, but not connected
to the bottom layer or the vinyl-coated nylon, is a fastener 18a
connected by a stitch 17a.
FIG. 5 shows the filter in stratified layers, shaped in a size
to fit snuggly into the pocket and to be taken out with ease. The
top layer of the wool felt 26a and the bottom layer of wool felt
26b are identical in size, which is a 1/2 inch larger in length
and width than the remaining layers. It is made of sheep's wool
pressed to 1/8 inch thick felt.
The second layer from the top is made of non-woven, gridded, polypropylene
homopolymer 30a and is identical to the second layer from the bottom,
which is also polypropylene homopolymer 30b. Both layers are cut
1/2 inch smaller in length and width than the top layers of wool
felt 26a and 26b, and has a thickness of 5 mils.
The third layer from the top is made of fiber glass wool 32a and
is identical to the third layer from the bottom, which is also of
fiber glass wool 32b. Both layers are cut 1/2 inch smaller in length
and width than the top layers of wool felt 26a and 26b. The layer
when sewn into the filter it has a thickness of less than 1/16th
of an inch.
At the center of the filter is a single layer of activated charcoal
on an open cell foam base 34. It is cut 1/2 inch smaller in length
and width than the top layers of wool felt 26a and 26b. The activated
charcoal when sewn into the filter, it has a thickness of 1/4 of
Operation--FIGS. 1 to 5
As shown in FIGS. 1 to 3, the protective underwear for malodorous
flatus is made of vinyl-coated nylon 10 with elastic around the
waist 12 and bifurcated legs 14. This creates an air-tightness which
consequently forces all flatus out through the exit hole 24. The
exit hole 24 is covered with a pocket 16 made of any porous fabric,
and has a fastener stitched 17 to the top to prevent the filter
FIG. 1B and FIG. 5 from slipping out.
The protective underwear can be made of any non-porous material
that will allow the flatus to remain inside and eventually out through
the exit hole 24. Additionally, the non-porous material used for
the underwear may have a polyester or cotton lining in case of sweating.
As seen in FIG. 3, a 1 inch band of elastic 12 is sewn into the
waist, and a 1/2 inch band of elastic 14a and 14b is sewn into each
of the legs to aid in the air-tightness of the underwear.
The pocket 16, shown in FIG. 4A and 4B is made of a porous fabric
and is 3/4 of an inch larger than the exit hole 24 all the way around,
except at the top; which is made 1 and a 1/4 inch longer to allow
material onto which the fastener 18 can be stitched 17. The underwear
must be sewn to bottom layer of the pocket with a stitch 22, and
stitched 17b again across the top, shown in FIG. 4B, connecting
the fastener 18b and the upper portion of the bottom layer to the
underwear 10. The top layer 16a of the pocket must be sewn to the
bottom layer of the pocket with a stitch 20, to begin 3/4 of an
inch from the top and continuing around to 3/4 of an inch from the
top on the other side; connecting the two layers with the underwear
10. An additional stitch 17a is used to connect the fastener 18a
to the top of the top layer of the pocket.
The fastener 18 can be of the hook and loop type, or of any for
holding the tops of the pocket 16 together. The purpose of the pocket
16 is to hold the filter in place, while the remainder of the underwear
The purpose of the filter, shown in FIG. 1B and 5, is to filter
out that 1% of human flatus causing the malodor or bad smell. With
each person and on any given day, the malodorous flatus is caused
by a variation of 6 substances as a result of undigested fat and
protein. They are: skatole, indole, ammonia, volatile amines, hydrogen
sulfide, and short-chain fatty acids. To Capture and hold this 1%
of malodorous flatus a stratified filter is used.
The top and bottom layers of the filter are of non-woven sheep's
wool felt 26, pressed to a 1/8 inch thickness, and are of the type
used in respirator filters approved by the Mine Safety and Health
Administration and the National Institute for Occupational Safety
and Health. They are 95% wool with a 26.2% specific gravity for
a density to allow the flatus under expulsion pressure to pass through.
The second layer of the stratified filter is of polypropylene 30a
and 30b non-woven fabric with a thickness of 5 mils, a 23.0 cross
direction, and a filament count of 57.0. These line pattern nets
are used as separation and support media in the filter.
The third layer of the stratified filter is fiber-glass wool 32,
composed of 92-95% fibrous glass, 5-8% extended phenolformaldehyde
resin, and 1% non-woven facings. There is no significant odor; it
can be with or without non-woven facings, and is cut from a gold
to yellow blanket.
In the center of the filter is a single activated carbon filter
34. This activated carbon filter is made from coconut shell material,
and has an add-on carbon density of 200% of the base media's weight;
resulting in a vast network of microscopic channels for trapping
The way this protective underwear for malodorous flatus operates,
is to capture the bad smell in the air-tight vinyl-coated nylon
10 in the underwear forcing it out through the exit hole 24. This
exit hole 24 is covered with a polyester pocket 16 made larger than
the hole, and fitted with a fastener at the top. The pocket 16 is
fitted with a filter stratified with wool felt 26, polypropylene,
fiberglass wool, and an activated carbon filter 34 in the center
designed to filter out the 6 substances causing the malodorous flatus.
Thus, the reader will see that the Protective Underwear With Malodorous
Flatus Filter provides a reliable, air-tight, washable underwear
which forces the flatus through the specially designed pocket containing
a replaceable filter. The very effective filter is layered with
various materials to filter out most of the 1% malodorous flatus;
yet porous enough to allow the remaining odorless flatus to pass
While this invention is primarily designed as an aid to the millions
of Americans suffering from Inflammatory Bowel Syndrome, it can
be used by all segments of the population seeking to end the social
stigma associated with foul smelling human gas. For instance, older
adults and senior citizens naturally have a less effective digestive
system that comes with aging. This invention could help anyone experiencing
a temporary interruption of normal digestion, such as diarrhea or
constipation especially when sleeping with their spouse or working
with peers. Also, certain races have an intolerance to lactose,
and may utilize this invention.
This invention has been described in detail in connection with
the preferred embodiments. The preferred embodiments, however, are
merely for example only and this invention is not restricted thereto.
It will be easily understood by those skilled in the art that variations
and modifications can be easily made within the scope of the invention,
as defined by the appended claims.
For instance, the bifurcated underwear could be made with drawstrings
sewn into the waist and legs as a way to accommodate the various
individual sizes while maintaining air-tightness. Also, a pouch
can be strategically sewn into the underwear for the purpose of
containing a colostomy. This pouch could be sewn into either the
front or the back of the underwear to fit the size of the bag and
remain air-tight; thereby providing a comfortable and practical
way to end the embarrassment associated with malodorous flatus for
colostomy users. Also, the underwear can be made with a soft cotton
or polyester knit inner lining for maintaining dry skin. And, of
course, the underwear and filter can easily be made in various sizes
ranging from children to adults, and with a masculine or feminine
The exit hole, pocket, and filter can be made in other sizes and
shapes. In addition to smaller or larger sizes, the exit hole, pocket,
and filter could be shaped to extend to the front of the underwear
to help the filtering process when the user is in a sitting position.
Any enlargement of these parts of the invention would help prevent
the build-up of moisture.
The filter can be enclosed by a smooth, non-filtering fabric to
facilitate the sliding in and out of the pocket. The layers of the
filter can also be changed as the state-of-the-art of gas filtering
improves. Another variation of the filter would be to add a layer
of scented powder or oil to produce a smell favorable to humans.
Hence, the filter will not only filter out the malodorous gas, but
replace it with a pleasant odor.
In short, this invention can be adapted to fit all sizes and shapes
of humans, and can be used either when sleeping or when fully dressed
to improve the quality of air we smell.