U.S. patent number 3,815,596 [Application Number 05/326,798] was granted by the patent office on 1974-06-11 for disposable face mask.
This patent grant is currently assigned to Automation Industries, Inc.. Invention is credited to Alcide Choiniere, Gary F. Keener, Charles G. Richitelli.
United States Patent |
3,815,596 |
Keener , et al. |
June 11, 1974 |
DISPOSABLE FACE MASK
Abstract
A disposable conductive anesthetic circuit is disclosed for
eliminating respiratory infections caused by cross contamination
from reuseable circuits. The disposable circuit is supplied in an
hermetically sealed sterilized bag and includes an improved face
mask having an elastomeric base covered with a conductive film, an
improved two-piece fitting having a Y-shaped portion and an elbow
portion, a pair of hoses bonded to the Y-shaped portion of the
fitting, and a breathing bag.
Inventors: |
Keener; Gary F. (Abbeville,
SC), Choiniere; Alcide (Abbeville, SC), Richitelli;
Charles G. (Greenwood, SC) |
Assignee: |
Automation Industries, Inc.
(Los Angeles, CA)
|
Family
ID: |
23273770 |
Appl.
No.: |
05/326,798 |
Filed: |
January 26, 1973 |
Current U.S.
Class: |
128/205.17;
128/205.25; 128/909 |
Current CPC
Class: |
A61M
16/06 (20130101); A61M 16/0833 (20140204); A61M
2209/06 (20130101); A61M 16/0683 (20130101); A61M
16/08 (20130101); Y10S 128/909 (20130101) |
Current International
Class: |
A61M
16/06 (20060101); A61M 16/08 (20060101); A61m
017/00 () |
Field of
Search: |
;128/188,141,142,142.2,142.3,142.4,145.5,146,146.2,146.3,146.7,147,195,201,191
;206/63.2R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Recla; Henry J.
Attorney, Agent or Firm: Sadler; Dan R.
Claims
What is claimed is:
1. In a disposable conductive anesthetic circuit, the improvement
which includes a face mask having
an elastomeric cup-shaped base member having an encompassing side
wall, a closed top wall and an open bottom, said open bottom being
conformable to the contours of a wearer's face for preventing the
passage of air between said base member and said wearer's face,
said base member being relatively soft, light in weight and having
substantially all of its entire body formed of a one-piece
deformable molding of polyurethane foam material and being
sufficiently rigid to maintain its formation,
said closed top wall having an aperture provided therein for fluid
communication with said base member, and
a conductive film covering at least a major portion of the outer
surface area of said base member, said conductive film having an
electrical resistance within a range of approximately 0-1
megohm.
2. The improvement of claim 1 wherein said polyurethane foam
material is water-blown.
3. The improvement of claim 1 including
a retaining ring encompassing said aperture, said retaining ring
having headstrap-receiving hook means provided thereon.
4. The improvement of claim 1 including
a grommet having a hollow, cylindrical core encompassed by a lower
torus and an upper torus spaced from said lower torus a distance
approximately equal to the thickness of said base member adjacent
said aperture,
said grommet including means associated therewith for snap-fitting
into position in said aperture with said lower torus disposed
inside of said base member and said upper torus disposed on the
outside of said base member, said grommet having an electrical
resistance within a range of approximately 0-1 megohm.
5. The improvement of claim 4 including
a headstrap-retaining ring encompassing said grommet between said
upper torus and said conductive film,
said retaining ring including headstrap-receiving hook means and
having an electrical resistance within a range of approximately 0-1
megohm.
6. The improvement of claim 4 including
a two-piece fitting having an elbow portion and a Y-shaped portion,
and
said elbow portion including a first end removably engaged in
close-fitting relationship in the core in said grommet and a second
end engaged in one end of said Y-shaped portion in slidable
rotation thereto.
7. The improvement of claim 6 wherein
said base member is molded from a polyurethane foam activated by
moisture at room temperature.
8. A disposable conductive anesthetic circuit, said circuit being
connectable to an anesthetic machine and including the combination
of
a face mask including an elastomeric cup-shaped base member having
an encompassing side wall, a closed top wall and an open bottom,
said base member being relatively soft, light in weight and having
substantially all of its entire body formed of a one-piece
deformable molding of polyurethane foam material and being
sufficiently rigid to maintain its formation,
said open bottom being conformable to the contours of a wearer's
face for preventing the passage of air between said base member and
said wearer's face,
said closed top wall having an aperture provided therein,
a conductive film covering at least a major portion of the outer
surface area of said base member, said conductive film having an
electrical resistance within a range of approximately 0-1 megohm,
and
conduit means having first ends connectable to said anesthetic
machine and second ends connectable to said aperture.
9. The disposable conductive anesthetic circuit of claim 8 wherein
said polyurethane foam material is water-blown.
10. The disposable conductive anesthetic circuit of claim 8 wherein
said conduit means includes:
a grommet having a hollow, cylindrical core encompassed by a lower
torus and an upper torus spaced from said lower torus a distance
approximately equal to the thickness of said base member adjacent
said aperture,
said grommet including means associated therewith for snap-fitting
into position in said aperture with said lower torus disposed
inside of said base member and said upper torus disposed on the
outside of said base member,
said grommet having an electrical resistance within a range of
approximately 0-1 megohm.
11. The disposable conductive anesthetic circuit of claim 10
wherein said conduit means further includes,
a two-piece fitting having an elbow portion and a Y-shaped
portion,
said elbow portion having a first end removably engaged in
close-fitting relationship in the core in said grommet and a second
end engaged in one leg of said Y-shaped portion in slidable
rotation thereto, and hose means connected to second and third legs
on said Y-shaped portion.
12. The disposable conductive anesthetic circuit of claim 11
including
a headstrap-retaining ring encompassing said grommet between said
upper torus and said base member.
13. The disposable conductive anesthetic circuit of claim 12
including
a breathing bag having an open neck portion communicating with said
anesthetic machine.
14. A face mask for a conductive anesthetic circuit including
conduit means for connecting said mask to an anesthetic machine,
said mask including:
an elastomeric cup-shaped base member having an encompassing side
wall, a closed top wall and an open bottom, said open bottom being
conformable to the contours of wearer'face for preventing the
passage of air between said base member and said wearer'face, said
closed top wall having an aperture provided therein for receiving
said conduit means, said base member being relatively soft,
light-in-weight and having substantially all of its entire body
formed of a one-piece deformable molding of polyurethane foam
material and being sufficiently rigid to maintain its formation;
and
a conductive film covering at least a major portion of the outer
surface area of said base member, said conductive film having an
electrical resistance within a range of approximately 0-1
megohm.
15. The face mask of claim 14 wherein
said base member is made from a polyurethane foam having a density
of approximately 13 lbs. per cubic foot.
16. The face mask defined in claim 14 wherein said polyurethane
foam material is water-blown.
17. The face mask of claim 14 including
a headstrap-retaining ring encompassing said aperture, said ring
including headstrap-receiving hook means.
18. The face mask defined in claim 14 wherein said conduit means
includes:
a grommet having a hollow, cylindrical core encompassed by a lower
torus and an upper torus spaced from said lower torus a distance
approximately equal to the thickness of said base member adjacent
said aperture,
said grommet including means associated therewith for snap-fitting
into position in said aperture with said lower torus being disposed
inside of said base member and said upper torus being disposed on
the upper side of said base member, said grommet having an
electrical resistance within a range of approximately 0-1
megohm.
19. The face mask of claim 18 including
a headstrap-retaining ring encompassing said grommet between said
upper torus and said conductive film,
said retaining ring including headstrap-receiving hook means and
having an electrical resistance within a range of approximately 0-1
megohm.
20. The face mask of claim 15 wherein said conduit means further
includes:
a two-piece fitting having an elbow portion and a Y-shaped portion,
said elbow portion including a first end removably engaged in
close-fitting relationship in the core in said grommet and a second
end engaging one leg of said Y-shaped portion in slidable rotation
thereto, and hose means engaging the other two legs of said
Y-shaped portion.
21. The face mask of claim 20 wherein
said base member is molded from a polyurethane foam which may be
activated at room temperature and which has a density within the
range of approximately 3-5 lbs. per cubic foot.
22. In a disposable conductive anesthetic circuit, the improvement
which includes a face mask having:
an elastomeric cup-shaped base member having an encompassing side
wall, a closed top wall and an open bottom, said open bottom being
conformable to the contours of a wearer's face for preventing the
passage of air between said base member and said wearer's face,
said base members being relatively soft, light-in-weight and having
substantially all of its entire body formed of a one-piece
deformable molding of polyurethane foam material, and being
sufficiently rigid to maintain its formation,
said closed top wall having an aperture provided therein for fluid
communication with said base member,
a conductive film covering at least a major portion of the outer
surface area of said base member, said conductive film having an
electrical resistance within a range of approximately 0-1
megohm,
a grommet having a hollow, cylindrical core encompassed by a lower
torus and an upper torus spaced from said lower torus a distance
approximately equal to the thickness of said base member adjacent
said aperture,
said grommet including means associated therewith for snap-fitting
into position in said aperture with said lower torus disposed
inside of said base member and said upper torus disposed on the
outside of said base member, said grommet having an electrical
resistance within a range of approximately 0-1 megohm,
a two-piece fitting having an elbow portion and a Y-shaped portion,
and
said elbow portion including a first end removably engaged in
close-fitting relationship in the core in said grommet and a second
end engaged in one end of said Y-shaped portion in slidable
rotation thereto.
23. A disposable conductive anesthetic circuit, said circuit being
connectable to an anesthetic machine and including the combination
of:
a face mask including an elastomeric cup-chaped base member having
an encompassing side wall, a closed top wall and an open bottom,
said base member being relatively soft, light-in-weight and having
substantially all of its entire body formed of a one-piece
deformable molding of polyurethane foam material, and being
sufficiently rigid to maintain its formation,
said open bottom being conformable to the contours of a wearer's
face for preventing the passage of air between said base member and
said wearer's face,
said closed top wall having an aperture provided therein,
a conductive film covering at least a major portion of the outer
surface area of said base member, said conductive film having an
electrical resistance within a range of approximately 0-1
megohm,
conduit means having first ends connectable to said anesthetic
machine and second ends connectable to said aperture,
said conduit means including a grommet having a hollow, cylindrical
core encompassed by a lower torus and an upper torus spaced from
said lower torus a distance approximately equal to the thickness of
said base member adjacent said aperture,
said grommet including means associated therewith for snap-fitting
into position in said aperture with said lower torus disposed
inside of said base member and said upper torus disposed on the
outside of said base member,
said grommet having an electrical resistance within a range of
approximately 0-1 megohm,
a two-piece fitting having an elbow portion and a Y-shaped portion,
and
said elbow portion having a first end removably engaged in close
fitting relationship in the core in said grommet and a second end
engaged in one leg of said Y-shaped portion, in slidable rotation
thereto, and hose means being removably connectable to second and
third legs on said Y-shaped portion.
24. A face mask for a conductive anesthetic circuit including
conduit means for connecting said mask to an anesthetic machine,
said mask including:
an elastomeric cup-shaped base member having an encompassing side
wall, a closed top wall and an open bottom, said open bottom being
conformable to the contours of wearer's face for preventing the
passage of air between said base member and said wearer's face,
said base member being relatively soft, light-in-weight and having
substantially all of its entire body formed of a one-piece
deformable molding of polyurethane foam material and being
sufficiently rigid to maintain its formation, said closed top wall
having an aperture provided therein for receiving said conduit
means,
a conductive film covering at least a major portion of the outer
surface area of said base member, said conductive film having an
electrical resistance within a range of approximately 0-1
megohm,
said conduit means including a grommet having a hollow, cylindrical
core encompassed by a lower torus and an upper torus spaced from
said lower torus a distance approximately equal to the thickness of
said base member adjacent said aperture,
said grommet including means associated therewith for snap-fitting
into position in said aperture with said lower torus being disposed
inside of said base member and said upper torus being disposed on
the upper side of said base member, said grommet having an
electrical resistance within a range of approximately 0-1 megohm,
and
a two-piece fitting having an elbow portion and a Y-shaped portion,
said elbow portion including a first end removably engaged in
close-fitting relationship in the core in said grommet and a second
end engaging one leg of said Y-shaped portion, in slidable rotation
thereto, and hose means removably engaging the other two legs of
said Y-shaped portion.
Description
BACKGROUND
In a hospital operating room, respiratory infections caused by
cross contamination from reuseable anesthetic circuits are a
constant and serious hazard. Despite advances in cleaning and
sterilizing procedures, there is no assurance that the problem has
been effectively eliminated in reuseable equipment.
Additionally, reuseable circuits absorb gases such as the
anesthetic during use. This not only increases induction time, but
also results in the leaching into the circuit of the gases from a
previous procedure. This may cause patient discomfort and/or
materially interfere with the effectiveness of the anesthetic. In
addition, over a period of time reuseable circuits tend to lose
their conductivity as a result of repeated stretching, etc. This in
turn increases the hazards of sparks, etc., from static
electricity.
SUMMARY
The present invention provides means for overcoming the foregoing
limitations and difficulties. More particularly, the present
invention provides a disposable conductive anesthetic circuit which
is economical to manufacture and is highly efficient in use. In the
embodiment of the invention disclosed herein, a disposable
conductive anesthetic circuit includes an improved face mask having
an elastomeric base member with an encompassing sidewall, a closed
top wall and an open bottom. The open bottom resiliently conforms
to the contours of a wearer's face whereby it is highly effective
to prevent the passage of air between the base member and the
wearer's face. An aperture is provided in the top wall for
receiving one end of the elbow bottom of a two-piece fitting having
a Y-shaped portion and an elbow portion. The other end of the elbow
portion is engaged on one leg of the Y-shaped portion and a pair of
hoses are bonded to the other legs of the Y-shaped portion. This
reduces handling time in the operating room and provides ease of
induction from any plane or direction.
The mask is provided with a conductive film which covers at least a
major portion of the outer surface area of the base member and
which has an electrical resistance within a range of approximately
0-1 megohm. A retaining ring encompasses the aperture in the top
wall and is held in place by a grommet which receives the elbow
portion of the two-piece fitting. The retaining ring is provided
with hooks for receiving a headstrap used to secure the mask in
position on a wearer's face.
The circuit also includes a breathing bag and may be packaged in a
sterilized bag.
DRAWINGS
FIG. 1 is a view of a disposable conductive anesthetic circuit
embodying one form of the present invention with the face mask
portion thereof in position on a wearer's face;
FIG. 2 is a plan view of an hermetically sealed package having the
circuit of FIG. 1 contained therein;
FIG. 3 is a plan view, on a somewhat enlarged scale, of the face
mask shown in FIG. 1;
FIG. 4 is a cross-sectional view, taken substantially along line
4--4 of FIG. 3, of the face mask shown in FIG. 1;
FIG. 5 is a bottom view of the face mask shown in FIG. 1;
FIG. 6 is an end view of the face mask shown in FIG. 1;
FIG. 7 is a cross-sectional view, taken substantially along line
7--7 of FIGS. 5, of the face mask in FIG. 1; and
FIG. 8 is an elevational view of a two-piece fitting used on the
face mask of FIG. 3.
DESCRIPTION
Referring to the drawings in more detail and particularly to FIG.
1, the present invention is particularly adapted to be embodied in
a disposable, conductive, anesthetic circuit 10. The embodiment of
the circuit 10 disclosed herein includes a face mask 12 which may
be positioned on the face F of a patient. The mask 12 is connected
to a pair of flexible hoses 14 and 16 by a special fitting 18.
The circuit 10 also includes a breathing bag 19 which may be made
by conventional methods. The breathing bag 19 is normally a
suitable latex having a slightly tacky surface for ease of
manipulation of the bag in an operating room. The bag 19 which may
have a 3 liter capacity includes a hollow neck portion 20 that is
adapted to frictionally engage a conventional down-leg 22 on a
conventional anesthetic machine 24 having an outlet fitting 26. The
fitting 26 also includes an inlet fitting 28 to which first the
ends 30 and 32 of hoses 14 and 16, respectively, may be
connected.
The anesthetic circuit 10 is preferably supplied in an hermetically
sealed package 34. The present package 34 includes a transparent,
plastic bag having an open top 36. The top 36 may be sealed with a
conventional tear strip 38. As explained in more detail
subsequently, the contents of the package 34, i.e., the anesthetic
circuit 10, is completely sterilized while it is in the package 34.
As a result when it is removed from the package 34, it is all ready
for use without any further treatment.
The face mask 12 (FIGS. 3 to 7) which is a one-piece molding
includes an elastomeric base member 40 having an encompassing side
wall 42, a closed top wall 44 and an open bottom 46. The open
bottom 46 is formed by the lower edge 48 of the side wall 42. The
lower edge 48 is contoured to conform to the contour of the face F
of the patient. The edge 48 has a fairly large radius and is very
resilient. As a consequence, one size of mask is generally adequate
to accommodate practically any human face with a sufficient degree
of sealing to prevent the passage of air between the base member 40
and the face F.
The top wall 44 has an aperture 50 provided therein for receiving a
suitable conduit means which includes grommet 52, two-piece fitting
18 and hoses 14 and 16. In the embodiment this includes a grommet
52 (FIGS. 3 and 4) made from any suitable material. For example,
the grommet 52 may be of an electrically conductive polyethylene
material having a durometer rating of approximately 72 or neoprene
polymeric material having a durometer rating of 55. Either material
must have an electrical resistance within a range of approxiamtely
0-1 megohm.
The grommet 52 includes a hollow, cylindrical core 54. The inner or
lower end of the grommet 52 includes a rounded or toroidal surface
56. The outer or upper end includes a rounded or toroidal surface
58. The space between these two enlargements is approximately equal
to the thickness of base member 40 adjacent aperture 50.
Accordingly, the grommet 52 may be snapped into position in
aperture 50 with a friction fit whereby the lower torus 56 is
disposed on the inside of face member 40. The upper torus 58 is
then disposed on the outside of the base member 40.
A shoulder 60 on the grommet 52 is effective to trap a strap
support or headstrap-retaining ring 62 between upper torus 58 and
top wall 44. The retaining ring 62 may be made from a suitable
material, such as 20-gauge, cold-rolled, sheet steel which is zinc
plated and provided with a chromate finish. Four hooks 64, 66, 68
and 70 (FIG. 3) are uniformly spaced around the plate member 72. An
aperture 74 (FIG. 4) is provided in the center of the plate 72.
The face mask 12 also includes a conductive film 76 which covers at
least a major portion of the outer surface area of base member 40.
This film 76 has an electrical resistance within a range of
approximately 0-1 megohm. The base member 40 may be made from a
wide variety of materials. However, at the present time one of the
preferred materials is a polyurethane foam material having a
density of approximately 12-14 lbs. per cubic foot alternatively,
the foam material may have a density of approximately 3 - 5 pounds
per cubic foot.
It has been found desirable for the face mask 12 to be made from a
water blown foam provided with a sprayed coating on the outside
surface. Since a water blown foam is activated by moisture at room
temperature, it may be formulated to produce a more flexible face
mask than is produced with heat-activated foams.
The base member 40 is normally a cast or molded foam part.
Accordingly, it may be coated with film 76 by spraying the molds
before introducing foam into the cavities. Alternatively, the
conductive film 76 may be sprayed onto base member 40 after it is
removed from the mold. The conductive film 76 preferably has a
0.001 to 0.002 inch thickness and comprises a material having an
electrical resistance in a range of approximately 0-1 megohm. The
film must also have a minimum elongation of 80 percent to prevent
cracking during elongation.
The two-piece fitting 18 (best seen in FIG. 8) includes an
elbow-type fitting 78 having a first end 80 and a second end 82.
The first end 80 is adapted to fit into the grommet 52 on the face
mask 12. The elbow 78 is preferably slidably mounted in the fitting
84, and as a result the elbow 78 may be rotated relative to the
fitting 84. The second end 82 is coupled to neck 86 of a Y-shaped
fitting 84.
The fitting 84 has a pair of legs 88 and 90 on the side opposite
from the neck 86. The two legs 88 and 90 are adapted to receive the
ends 92 and 94 of the hoses 14 and 16. The surfaces of the legs 88
and 90 are preferably corrugated or serrated to insure the hoses 14
and 16 being retained in position. The neck 86 of fitting 84 in
addition to accepting end 82 of elbow 78 has been designed to fit
into and rotate in grommet 52 as an alternate assembly. The ID of
neck 86 of fitting 84 and ID of end 80 of elbow 78 has been
designed to accept intertracheal tubing connectors.
The fitting 18 may be made from any suitable material. However, it
is preferably made from a plastic having an electrical resistance
within a range of approximately 0-1 megohm. Although the hoses 14
and 16 may be made from any desirable material, it has been found
advantageous to use an electrically conductive polyethylene
material having an electrical resistance with a range of
approximately 0-1 megohm.
In order to use the present invention the various parts of the
anesthetic circuit 10 are sealed in the package 34. Because of the
unique design and low cost, all of the parts are brand new.
Normally, the mask 12, Y-fitting 84 and the two hoses 14 and 16 are
preassembled before packaging. Although the breathing bag 18 is
contained in the package 34, it is normally included as a separate
item. The contents of the bag, i.e., the mask 12, the hoses 14 and
16, the Y-fitting 84 and the breathing bag 18 are all sterilized
when they are in the package 34.
In order to use the anesthetic circuit 10 at the time of an
operation, the package 34 is placed in the operating room
preparatorily to the operation. When the operation is about to
commence, the package 34 is opened by removing tear strip 38. As
soon as this tear strip 38 is removed, all of the parts of the
breathing circuit 10 are exposed and readily available. Since all
of these have been previously sterilized, they are ready for use
without any further preparation. The breathing bag 19 is removed
and connected to the anesthetic machine 24 by frictionally sliding
the bag fitting 20 of the bag 19 over the down-leg 22.
The assembly comprising mask 12, fitting 18, hoses 14 and 16 are
then removed from package 34. The ends 30 and 32 of the hoses 14
and 16 are then frictionally slipped onto the fittings 28, 26,
respectively, of the machine 24. The mask 12 may then be positioned
on the patient's face F. Since the mask is made of a resilient
foam, it is very easy to handle and use. It can be easily
manipulated into position on the patient's face whereby it will be
comfortable and always operate effectively.
The circulation of the anesthetic may then commence. If desired a
suitable headstrap (not shown) may be engaged on hooks 64, 66, 68
and 70 and positioned behind the patient's head H.
At the completion of the operation, the face mask 12 is removed
from the patient's face F and the circuit 10 is removed from the
machine. Since all of the parts of this circuit 10 are very low
cost, they are discarded upon the completion of the operation. As a
consequence, the various parts of the circuit 10 are only used
once. Therefore, the circuit cannot be contaminated by any prior
usage, etc.
* * * * *