U.S. patent number 3,575,170 [Application Number 04/799,331] was granted by the patent office on 1971-04-20 for breather assembly for a sealed container.
This patent grant is currently assigned to Plastronics Inc.. Invention is credited to James L. Clark.
United States Patent |
3,575,170 |
Clark |
April 20, 1971 |
**Please see images for:
( Certificate of Correction ) ** |
BREATHER ASSEMBLY FOR A SEALED CONTAINER
Abstract
A breather assembly for a sealed container such as a bedside
drainage bag comprising a breather element of woven fiberglass
fabric material with a teflon coating adapted to permit free
passage of gas therethrough and to resist passage of liquid
therethrough. The breather element also acts to filter out bacteria
in the air to thus prevent its entrance into the container. The
breather element is mounted in a circular opening in a retaining
ring member and permanently retained therein by a pair of outer
housing members sealed by electronic welding to the retaining ring
member. The assembly is then mounted in the wall of a container
such as a bedside drainage bag with the breather element positioned
in alignment with a flow opening in the wall of the container.
Inventors: |
Clark; James L. (Whitefish Bay,
WI) |
Assignee: |
Plastronics Inc. (Milwaukee,
WI)
|
Family
ID: |
25175609 |
Appl.
No.: |
04/799,331 |
Filed: |
February 14, 1969 |
Current U.S.
Class: |
96/6; 261/101;
604/324 |
Current CPC
Class: |
A61F
5/44 (20130101); A61F 5/441 (20130101) |
Current International
Class: |
A61F
5/441 (20060101); A61F 5/44 (20060101); A61f
005/44 () |
Field of
Search: |
;128/275,276,283,294,295
;261/101 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Rosenbaum; Charles F.
Claims
I claim:
1. A breather assembly for a sealed container comprising:
a breather element adapted to permit free passage of gas
therethrough and to resist passage of liquid therethrough, said
breather element comprising a woven fiberglass fabric having a
Teflon coating thereon;
a breather element-retaining ring having a breather
element-retaining opening therethrough adapted to receive said
breather element therein, said ring being made from nonporous
plastic material; and
a pair of housing members positioned on opposite sides of said
breather element and sealed to said retaining ring to thereby
retain said breather element in said breather element-retaining
opening, said housing members being made from nonporous plastic
material and each having at least one opening therethrough
positioned opposite said breather element.
2. A breather assembly according to claim 1 in which said breather
element is circular in shape and said opening in said retaining
ring is also circular in shape and has a diameter slightly greater
than said breather element.
3. A breather assembly according to claim 2 in which said housing
members are sealed to said ring by a continuous circular weld
positioned slightly beyond the outer periphery of said breather
element.
4. A breather assembly according to claim 3 in which said openings
in said housing members are circular and are substantially
concentric with said circular breather element and of smaller
diameter than said element so that said housing members will
overlie said breather element around said circular openings in said
housing member, said breather element being adhered to said housing
members in the areas where the housing members overlie said
breather element.
5. A breather element according to claim 1 in which the thickness
of said breather element is slightly less than the thickness of
said breather element-retaining ring.
Description
BACKGROUND OF INVENTION
1. Field of Invention
This invention relates to a breather assembly for a closed
container and more particularly to a specially designed breather
assembly for use in a bedside drainage bag of the type used in a
closed catheter system.
2. Description of Prior Art
In a so-called closed catheter system, the catheter is adapted to
be passed through the urethra into the bladder of a patient and
when so positioned forms an essentially closed or airtight system
with respect to the drainage bag used to collect the liquid flowing
from the patient. Drainage bags of the type used in such a system
are generally made from a plastic material and when put into use
there is generally little or no air in the bag at the beginning of
the drainage operation. Thus, as drainage of liquid into the bag
occurs the flexible walls of the bag will be bulged outwardly
thereby increasing the volume of air space inside the bag. This
expansion of the bag in a closed system will tend to create a
vacuum within the system which condition may be very detrimental to
the user due to the possibility of resultant serious injury to the
bladder. It is important, therefore, that some means be provided to
prevent such a vacuum condition from occurring in the patient's
bladder. The purpose of this invention, therefore, is to provide an
improved breather assembly for a drainage bag which permits the
free flow of air into the bag and at the same time resists the flow
of liquid out of the bag. Another object is to provide a breather
assembly which functions to filter bacteria out of the air flowing
into the bag.
A further object of this invention is to provide a breather
assembly which can be produced economically on a mass production
basis.
Other objects and advantages will be pointed out in, or be apparent
from, the description which follows and in the appended claims.
SUMMARY OF INVENTION
A breather assembly for a sealed container comprising a breather
element adapted to permit free passage of gas therethrough and to
resist passage of liquid therethrough. Such element also filters
bacteria from the air flowing therethrough. Such assembly further
includes a breather element retaining ring having a breather
element retaining opening therethrough adapted to receive said
breather element therein. Said ring is preferably made from a
nonporous plastic material. The assembly further includes a pair of
housing members also of nonporous plastic material positioned on
opposite sides of said breather element and sealed to said
retaining ring to thereby retain said breather element in said
breather element retaining opening. Such housing members each have
at least one opening therethrough positioned opposite said breather
element to thus permit free passage of air through the assembly. A
further characteristic of the assembly is that the openings in the
housing members are substantially concentric with the breather
element and of smaller cross-sectional area than said element so
that the housing members will overlie the breather element in the
area immediately surrounding said openings in the housing members.
The breather element is adhered to the housing members in the areas
where the housing members overlie the breather element to thereby
prevent any tendency of liquid to flow around the edges of the
breather element when in assembled position.
DESCRIPTION OF DRAWINGS
FIG. 1 is a perspective view of a bedside drainage bag
incorporating the present invention;
FIG. 2 is a fragmentary sectional view of the breather assembly of
this invention taken along line 2-2 of FIG. 1;
FIG. 3 is a sectional view of the breather assembly only, prior to
its incorporation into the drainage bag; and
FIG. 4 is an exploded view showing the various components of the
breather assembly.
DESCRIPTION OF PREFERRED EMBODIMENT
Referring now to the drawings in detail, FIG. 1 shows a bedside
drainage bag 10 designed for use in a closed catheter system.
Bedside drainage bag 10 is preferably made from two sheets of
polyvinyl chloride plastic 12, 14 which are sealed to each other
around the peripheral edges thereof as at 16 preferably by an
electronic welding procedure to provide a sealed container.
The drainage bag is provided with an inlet fitting 18 having a tube
20 connected thereto for conducting the flow of fluid into the bag.
Fitting 18 and tube 20 are also preferably made from polyvinyl
chloride material. Attached to tube 20 is a so-called "retention"
type catheter (not shown) of any suitable design.
The bag 10 is also provided with a drainage assembly 22 designed
for periodically draining the bag of its contents. The drainage
assembly 22 does not form a part of this invention, and, therefore,
a detailed description of such assembly will not be made herein.
The bag 10 is also provided with a supporting cord 24 for hanging
the entire unit on the rail of a hospital bed.
The catheter attached to tube 18 is adapted to be passed through
the urethra into the bladder of a patient and when so positioned
forms an essentially closed or airtight system with respect to the
drainage bag 10. Plastic drainage bags of the type shown herein
when put into use are generally in a flat condition with the walls
12 and 14 thereof in close contact with each other. Thus, when the
bag is put into use there is generally little or no air in the bag
at the beginning of the drainage operation.
It will be appreciated, therefore, that as drainage of liquid
through tube 18 into the bag occurs the flexible walls of the bag
will be bulged outwardly thereby increasing the volume of "air"
space inside the bag. This expansion of the bag in a closed system
will tend to create a vacuum within the system which condition may
be very detrimental to the user due to the possibility of resultant
serious injury to the bladder. It is essential therefore that some
means be provided to prevent such a "vacuum" condition from
occurring.
Such a means is provided by a specially designed breather assembly
26 mounted in the upper portion of the bag as shown in FIG. 1. As
will be explained thereinafter, breather assembly functions to
allow free passage of air in and out of bag 10 while at the same
time prevents flow of liquid therethrough under normal
circumstances. The breather assembly also functions to filter out
bacteria from the air flowing into the bag to prevent such bacteria
from reaching the patient's bladder.
As shown in FIG. 4, the breather assembly is comprised of four
major components namely a filter element 28, a filter
element-retaining ring 30 and a pair of outer housing members 32
and 34.
Filter element-retaining ring 30 (preferably of polyvinyl chloride
material) is of circular shape and has a central filter
element-retaining opening 36 therein.
The breather element 28 is preferably made of a material comprised
of a woven fiberglass fabric with a teflon coating, which material
is adapted to freely allow the passage of air therethrough while,
at the same time, resisting the passage of liquid therethrough.
Such material also functions to filter out bacteria in the air
flowing therethrough. The breather material, however, is not
subject to electronic welding as is the polyvinyl chloride material
used in the other parts of the drainage bag.
The breather element 28 is of circular shape having a diameter
slightly less than that of the breather-retaining opening 36 in
ring member 30. It is also noted that the thickness of breather
element 28 is also slightly less than the thickness of retaining
ring 32. This means, of course, that the breather element 28 will
fit within the breather-retaining opening 36 when the parts are in
assembled position as shown in FIG. 3.
The outer housing members 32 and 34 are also comprised of nonporous
flexible material such as polyvinyl chloride having the
characteristics of receiving an electronic weld. Housing members 32
and 34 are provided with centered openings 38 and 40 of smaller
diameter than that of breather element 28. The breather assembly is
completed as shown in FIG. 3 by positioning breather element 28 in
retaining opening 36 and then completing the assembly by
positioning housing members 32 and 34 on opposite sides of
retaining ring 30 with openings 38 and 40 concentrically arranged
with respect to breather element 28. The breather element 28 is
permanently retained in the assembly by a circular electronic weld
as indicated by reference numeral 42. As shown in FIGS. 3 and 4,
weld 42 extends around the outer periphery of breather element 28
and provides a continuous seal between housing members 32, 34 and
the retaining ring 30.
As indicated previously, the material of breather element 28 is not
susceptible to electronic welding, however, the heat and pressure
produced by weld 42 will cause the inner faces of housing members
32 and 34 which overlie breather element 28 to become adhered to
the adjacent faces of breather element 28 in the areas indicated by
reference numerals 44 and 46. Such adhesive areas will serve to
securely seal the breather element 28 in the overall assembly to
thus prevent any tendency of liquid to flow around the edges of the
breather element in the completed assembly.
As described, the breather element 26 can be completely
subassembled independently of the drainage bag 10 thus lending
itself to mass production methods of manufacturer. After it has
been subassembled as shown in FIG. 3, it can then be readily
mounted in the front face 12 of the drainage bag 10 by first
cutting a circular flow opening 48 in front face 12 and then
electronically welding the breather assembly to the front face 12
by means of an electronic weld indicated by reference numeral 50 in
FIGS. 1 and 2.
The breather assembly 26 thus assembled in the bag 10 functions to
permit the free passage of air from the atmosphere into the inside
of the bag as the bag expands due to flow of fluid therein through
tube 20 from the patient. Thus, any tendency of a vacuum to be
created in the closed system will be alleviated. Also as indicated
previously, breather assembly 26 functions to filter out bacteria
in the air flowing into the bag. It will also be appreciated that
any tendency of liquid inside the bag to flow out through the
breather element will be prevented. This may be a problem when
handling the filled bag for drainage thereof of for other
reasons.
Although but one embodiment of the present invention has been
illustrated and described, it will be apparent to those skilled in
the art that various changes and modifications may be made therein
without departing from the spirit of the invention or from the
scope of the appended claims.
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