U.S. patent application number 11/406133 was filed with the patent office on 2006-12-21 for apparatus and method for releasing a measured amount of content from a container.
This patent application is currently assigned to Foamix Ltd.. Invention is credited to Meir Eini, Doron Friedman, Dov Tamarkin.
Application Number | 20060285912 11/406133 |
Document ID | / |
Family ID | 39082388 |
Filed Date | 2006-12-21 |
United States Patent
Application |
20060285912 |
Kind Code |
A1 |
Eini; Meir ; et al. |
December 21, 2006 |
Apparatus and method for releasing a measured amount of content
from a container
Abstract
Apparatus and method for delivering a predetermined quantity of
content from a pressurized container include a container for
housing a pressurized gas and a content; a valve for releasing
content from the container; a metering chamber in fluid
communication with the container and the valve and having an upper
wall and a lower wall, the metering chamber defining a volume
proportionate to a predetermined quantity of content to be
delivered; and a movable partition comprising a seal positioned in
the chamber and capable of moving from a first resting position to
a second sealing position, the sealing position sealing fluid
communication of the chamber with the valve. When the valve is
opened to deliver content from the container, the movable partition
moves from a first resting position to a second sealing
position.
Inventors: |
Eini; Meir; (Ness Ziona,
IL) ; Tamarkin; Dov; (Maccabim, IL) ;
Friedman; Doron; (Karmei Yosef, IL) |
Correspondence
Address: |
WILMER CUTLER PICKERING HALE AND DORR LLP
60 STATE STREET
BOSTON
MA
02109
US
|
Assignee: |
Foamix Ltd.
Rehovot
IL
|
Family ID: |
39082388 |
Appl. No.: |
11/406133 |
Filed: |
April 18, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60673087 |
Apr 19, 2005 |
|
|
|
60673088 |
Apr 19, 2005 |
|
|
|
Current U.S.
Class: |
401/118 |
Current CPC
Class: |
B65D 83/285 20130101;
B65D 83/303 20130101; A45D 2200/1018 20130101; A45D 2200/057
20130101; A45D 34/04 20130101; B65D 83/54 20130101; B65D 83/36
20130101 |
Class at
Publication: |
401/118 |
International
Class: |
A46B 11/00 20060101
A46B011/00 |
Claims
1. An apparatus for delivering a predetermined quantity of content
from a pressurized container including: a container capable of
housing a pressurized gas and a content; a valve for releasing
content from the container; a metering chamber in fluid
communication with the container and the valve, said metering
chamber having an upper wall and a lower wall and defining a volume
proportionate to a predetermined quantity of content to be
delivered; and a movable partition comprising a seal located in the
chamber, said movable partition capable of moving from a first
resting position spaced apart from the valve to a second sealing
position in sealing arrangement with the valve.
2. The apparatus of claim 1, wherein the resting position of the
movable partition is adjacent to the bottom wall of the metering
chamber.
3. The apparatus of claim 1, wherein the sealing position of the
movable partition is adjacent to the upper wall of the metering
chamber.
4. The apparatus of claim 1, wherein the movable partition
substantially spans a cross-sectional area of the metering
chamber.
5. The apparatus of claim 1, wherein the movable partition is of
sufficient specific weight to provide vertical displacement of the
movable partition within the chamber against the resistance of
content of varying viscosities.
6. The apparatus of claim 1, wherein the movable partition
comprises at least one aperture.
7. The apparatus of claim 1, wherein the movable partition
comprises a plurality of apertures.
8. The apparatus of claim 1, wherein the plurality of apertures are
arranged in a geometric configuration resembling that of a
sieve.
9. The apparatus of claim 7, wherein said aperture has a dimension
substantially approximating 0.1%-3% of the surface area of said
movable partition.
10. The apparatus of claim 7, wherein said aperture has a dimension
substantially approximating 1% of the surface area of said movable
partition.
11. The apparatus of claim 1, further including a bias attached to
the movable partition.
12. The apparatus of claim 1, further including a bias comprises a
spring, coil or lever.
13. The apparatus of claim 1, further including a bias comprises a
weight.
14. The apparatus of claim 1, further including a one-way valve in
fluid communication with the interior of the container and the
metering chamber.
15. The apparatus of claim 1, wherein the upper wall of the
metering chamber is tapered.
16. The apparatus of claim 1, further comprising an applicator.
17. The apparatus of claim 16, wherein the applicator comprises an
extension tube and an applicator head having at least one smooth
surface.
18. A method for delivering a predetermined quantity of content
from a pressurized container including: (a) providing an apparatus
for releasing a predetermined quantity of content from a
pressurized container including: (i) a container housing a
pressurized gas and a deliverable content; (ii) a valve for
releasing the content from the container; (iii) a metering chamber
in fluid communication with the container and the valve, said
metering chamber having an upper wall and a lower wall and defining
a volume proportionate to a predetermined quantity of content to be
delivered; and (iv) a movable partition comprising a seal located
in the chamber, said movable partition capable of moving from a
first resting position spaced apart from the valve to a second
sealing position in sealing arrangement with the valve; and (b)
opening the valve to deliver content from the container, wherein
the movable partition moves from the first resting position to the
second sealing position, said sealing position sealing fluid
communication of the chamber with the valve to thereby halt content
delivery from the container.
19. The method of claim 18, wherein said movable partition returns
to the resting position after content delivery.
20. The method of claim 19, wherein return to the resting position
is accomplished by application of a force on the movable
partition.
21. The method of claim 20, wherein the force is gravitational
force.
22. The method of claim 20, wherein the force is applies by a
biasing element.
23. The method of claim 18, further comprising applying delivered
content to a target surface with an applicator.
24. An apparatus for applying a foamed content to a surface,
comprising: (a) a container capable of housing a pressurized gas
and a content; (b) a valve in fluid communication with the
container for releasing the content from the container; and (c) an
applicator in fluid communication with the valve for controlling
application of the content, said applicator comprising at least one
substantially flat surface for spreading a foamed content.
25. The apparatus of claim 24, wherein the substantially flat
surface comprises an aperture for introducing the content from the
container onto the flat surface.
26. The apparatus of claim 24, wherein the substantially flat
surface comprises at least one flexible membrane.
27. The apparatus of claim 24, wherein the applicator comprises an
extension tube and an applicator head, said applicator head having
at least one substantially flat surface.
28. An method for applying a foamed content to a surface,
comprising: providing a pressurized container containing a foamable
content, and comprising a valve in fluid communication with the
container interior for releasing the content from the container and
an applicator in fluid communication with the valve; and releasing
foamed content onto a surface and spreading the foamed content
using a substantially smooth surface of the applicator.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit under 35 U.S.C. .sctn.
19(e) of U.S. Provisional Patent Application No. 60/673087, filed
on Apr. 19, 2005, entitled Foam Applicator, which is herein
incorporated by reference in its entirety.
[0002] This application also claims the benefit under 35 U.S.C.
.sctn.119(e) of and U.S. Provisional Patent Application No.
60/673088, filed on Apr. 19, 2005, entitled Apparatus and Method
for Releasing a Measure of Content from a Container, which is
herein incorporated by reference in its entirety.
FIELD OF THE INVENTION
[0003] The present invention relates to a method and apparatus for
controlled release of content from a container. In particular, the
present invention relates to method and apparatus for releasing a
predetermined quantity of content from a pressurized container. The
present invention also relates to a method and apparatus for
controlled application of foam released from a container.
BACKGROUND OF THE INVENTION
[0004] Foam containers have existed for many years and are used for
a variety of products.
[0005] Methods of administering metered doses from a dosing device
are known, however, most are directed to dispensing liquid forms,
such as creams, gels and fluids. See, e.g., U.S. Pat No. 6,186,367
and United States Published Appln. No. 2005/0054991.
[0006] Methods for the volumetrically controlled dosing of foams
have been described using a metering valve in which valved inlet
and outlet passages control the flow of a fluid into a dosing
chamber of predetermined volume. See, for example, U.S. Pat. No.
5,007,556.
[0007] Prior art foam metering devices have been described as
inaccurate and imprecise. Foam metering devices capable of
providing a reliable measure or dose of content from a pressurized
container are desired.
[0008] There has long existed the need for an apparatus and method
for controlled application of foam released from a foam container.
The uses of such an apparatus vary widely and can include any
process requiring or enhanced by controlled application of the foam
for which manual application using a brush, hands or any other
implement or member is to be avoided.
SUMMARY OF THE INVENTION
[0009] A method and apparatus for releasing a predetermined
quantity of content from a pressurized container is described. A
method and an apparatus for applying foam released from a
pressurized container also is described.
[0010] According to one aspect of the present invention there is
provided an apparatus for releasing a predetermined quantity of
content from a pressurized container including a container
including a container capable of housing a pressurized gas and a
content; a valve for releasing content from the container; a
metering chamber in fluid communication with the container and the
valve, said metering chamber having an upper wall and a lower wall
and defining a volume proportionate to a predetermined quantity of
content to be delivered; and a movable partition comprising a seal
located in the chamber, said movable partition capable of moving
from a first resting position spaced apart from the valve to a
second sealing position in sealing arrangement with the valve.
[0011] In one or more embodiments, the resting position of the
movable partition is adjacent to the bottom wall of the metering
chamber and/or the sealing position of the movable partition is
adjacent to the upper wall of the metering chamber.
[0012] In one or more embodiments, the movable partition
substantially spans a cross-sectional area of the metering chamber
and/or the movable partition is of sufficient specific weight to
provide vertical displacement of the movable partition within the
chamber against the resistance of content of varying
viscosities.
[0013] In one or more embodiments, the movable partition comprises
at least one aperture, or the movable partition comprises a
plurality of apertures. The plurality of apertures may be arranged
in a geometric configuration resembling that of a sieve. The
aperture may have a dimension substantially approximating 0.1%-3%
of the surface area of said movable partition, or substantially
approximating 1% of the surface area of said movable partition.
[0014] In one or more embodiments, the apparatus further includes a
bias attached to the movable partition, and for example, the bias
includes a spring, coil or lever, or a weight.
[0015] In one or more embodiments, the apparatus further includes a
one-way valve in fluid communication with the interior of the
container and the metering chamber.
[0016] In one or more embodiments, the upper wall of the metering
chamber is tapered.
[0017] In one or more embodiments, the apparatus further includes
an applicator. The applicator may include an extension tube and an
applicator head having at least one smooth surface.
[0018] In another aspect of the invention, a method for delivering
a predetermined quantity of content from a pressurized container
includes providing an apparatus for releasing a predetermined
quantity of content from a pressurized container including (i) a
container housing a pressurized gas and a deliverable content; (ii)
a valve for releasing the content from the container; (iii) a
metering chamber in fluid communication with the container and the
valve, said metering chamber having an upper wall and a lower wall
and defining a volume proportionate to a predetermined quantity of
content to be delivered; and (iv) a movable partition comprising a
seal located in the chamber, said movable partition capable of
moving from a first resting position spaced apart from the valve to
a second sealing position in sealing arrangement with the valve;
and opening the valve to deliver content from the container,
wherein the movable partition moves from the first resting position
to the second sealing position, said sealing position sealing fluid
communication of the chamber with the valve to thereby halt content
delivery from the container.
[0019] A further aspect of the present invention relates to methods
and apparatus for the non-manual application of a foam originating
from any pressurized container. The foam applicator system can be
attached to or integrally formed with any pressurized container and
or retrofitted to any existing pressurized container.
[0020] In one aspect of the invention, an apparatus for applying a
foamed content to a surface includes a container capable of housing
a pressurized gas and a content; a valve in fluid communication
with the container for releasing the content from the container;
and an applicator in fluid communication with the valve for
controlling application of the content, said applicator comprising
at least one substantially flat surface for spreading a foamed
content.
[0021] In one or more embodiments, the substantially flat surface
comprises an aperture for introducing the content from the
container onto the flat surface.
[0022] In one or more embodiments, the substantially flat surface
includes at least one flexible membrane.
[0023] In one or more embodiments, the applicator includes an
extension tube and an applicator head, said applicator head having
at least one substantially flat surface.
[0024] In another aspect of the invention, a method for applying a
foamed content to a surface includes providing a pressurized
container containing a foamable content, and comprising a valve in
fluid communication with the container interior for releasing the
content from the container and an applicator in fluid communication
with the valve; and releasing foamed content onto a surface and
spreading the foamed content using a substantially smooth surface
of the applicator.
[0025] The metered dose apparatus provides an integrated metering
chamber and dipstick that can be readily adapted to pre-existing
containers. The apparatus does not require special valves and can
be used with most conventional canisters. Thus, it is versatile and
can be used with a wide variety of foamable compositions and
containers without the need to redesign the dosage delivery
system.
[0026] Furthermore, a system according to one or more embodiments
of the present invention may be used in many industrial processes
requiring removal of a liquid from a container and adding and/or
mixing the content in exact measurements. Further uses would
include release of a controlled dose of any pharmaceutical and or
cosmetic material from a pressurized container.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] FIG. 1 is a cross sectional side view of a first embodiment
of an apparatus for releasing a measured amount content from a
container.
[0028] FIG. 2 is a cross sectional side illustration of the
metering system at rest.
[0029] FIG. 3 is a cross sectional side illustration of the
metering system during discharge.
[0030] FIG. 4 is a cross sectional side view of a metering system
illustrating the sealing mechanism according to one or more
embodiments of the present invention.
[0031] FIG. 5 is a cross sectional side illustration of a metering
system upon conclusion of discharge of a metered dose; the system
is restored to its original position to administer a further
dose.
[0032] FIG. 6 is schematic top view of a movable partition used in
an apparatus for releasing a measure of content from a container
according to one or more embodiments of the present invention.
[0033] FIG. 7 is a cross sectional side view of another embodiment
of an apparatus for releasing a measured amount of content from a
container in an inverted position.
[0034] FIG. 8 is a schematic cross sectional side view of one
embodiment of a foam applicator system according to the present
invention.
[0035] FIG. 9 is schematic cross sectional view of one embodiment
of a foam applicator system according to the present invention.
[0036] FIG. 10 is schematic cross sectional view of one embodiment
of a foam applicator system according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0037] Turning now to the drawings, FIG. 1 shows a container 10
including a content 14 under pressure created by gas 12. The
container 10 is hollow body which may be made from any material,
for example, aluminum, tin-plate, plastics including polyethylene
terephthalate (PET), oriented polypropylene (OPP), polyethylene
(PE) or polyamide and including mixtures, laminates and the like.
When the container is metal, the interior surface of the metal
container preferably is laminated with a plastic material or coated
with a lacquer or with a varnish to protect the interior surface of
the container from corrosion. Corrosion may weaken the container
and may also lead to a discoloration of the container's content.
Preferred plastic materials for lamination and lacquers or
varnishes for coating are epoxy phenolic, polyamide imide,
organosol, PET, PP, PE or a combination thereof.
[0038] Content 14 is flowable and can be a liquid or a semi-liquid.
Content 14 includes components to provide the desired functionality
of the foam upon administration, as well as additives that promote
foam formation, such as surfactants and propellant. Aerosol
propellants are used to generate and administer the foamable
composition as a foam. The content may include a foamable emulsion,
a foamable solution, a foamable suspension, a foamable gel, a
viscous material, an extrudable material or a gel. The total
composition including propellant, foamable compositions and
optional ingredients is referred to as the foamable carrier. The
propellant makes up about 3% to about 25 wt % of the foamable
carrier. Examples of suitable propellants include volatile
hydrocarbons such as butane, propane, isobutane or mixtures
thereof, and fluorocarbon gases. In one or more embodiments, the
propellant is a liquefied gas, such as butane, propane, isobutane
or mixtures thereof. The liquefied gas typically forms a solution
or emulsion with the other components of content 14 and is in
equilibrium with propellant gas, which occupies a volume of the
container (e.g., the "head space") and generates the internal
pressure used to discharge the product from inside the container.
Furthermore, the gas expands to form many "bubbles" within the
composition thereby creating the foam. Sufficient gas is contained
in the container to substantially expel all the product from the
container at the correct pressure throughout the life of the
article. The quantity also depends from the type of gases used.
[0039] Container 10 further includes an integrated metering system
including a metering chamber 16 in fluid communication with an
upper conduit 18 and a lower conduit 20. Chamber 16 can be of any
shape, e.g., of circular, rectangular, or oval cross-section or the
like, and can be attached to or integrally formed with the upper 18
or lower 20 conduits, or both. Chamber 16 is selected to have a
volume can hold and deliver a preselected quantity of content 14.
Chamber 16 may contain shoulders 36, as is discussed in greater
detail below. Alternatively, the chamber walls may be shaped to
provide the desired interior volume and geometry. Chamber 16 and
shoulder 36 may be constructed of a resilient material or a
semi-resilient material, such as a vulcanized material, a rubber, a
silicone, a polymer and a plasticized material.
[0040] Lower conduit 20 is immersed in or in fluid communication
with content 14, thereby readily facilitating flow of liquids,
fluids and gas from the interior of the container 10, into lower
conduit 20 through chamber 16, and into upper conduit 18. In order
to deliver the majority of the content from the container, the
lower conduit 20 extends a distance below chamber 16, and in some
embodiments, a distance into the region of container where content
14 resides. In some embodiments, the lower conduit 20 extends
substantially to a floor 10a of container 10.
[0041] Upper conduit 18 includes bleed hole or unidirectional valve
31, which is located in a wall portion of conduct 18 that is housed
within the container and which provides one-way fluid communication
between the container interior and the upper conduit. Fluid and gas
are thus capable of flowing from the container and into upper
conduit 18.
[0042] In order to control the dose size and its delivery from the
chamber, movable partition 28 is slidably positioned within chamber
16 and is of a size and shape that permits it to be positioned
along an inner wall 16a of chamber 16. The movable partition 28 is
capable of vertical movement/displacement along the wall of chamber
16 in a direction indicated by arrow 17 by application of suitable
upward and downward pressures or by gravitational forces. Movable
partition 28 may have sufficient specific weight to be capable of
downward vertical displacement within chamber 16 against the
resistance of content 14 having varying viscosity. As discussed
below, such displacement may be aided by biasing element 34.
Movable partition 28 may be constructed of a resilient material or
a semi-resilient material, such as for example, a vulcanized
material, a rubber, a silicone, a polymer or a plasticized
material.
[0043] Movable partition 28 includes sealer 30 for substantially
sealing upper conduit 18 at opening 18a. Sealer 30 may be
constructed of a resilient material or a semi-resilient material,
which may be the same or different from that of the movable
partition. Sealer 30 may be integral with movable partition 28 or
it may be attached to the movable partition, for example by
co-extrusion, heat welding, adhesives or any other appropriate
joining method. Sealer 30 and upper conduit 18 are positioned in
vertical alignment of one another, so that sealer 30 can block or
interrupt fluid communication between chamber 16 and upper conduit
18 when positioned against the lower opening 18a of the upper
conduit 18, as illustrated in FIG. 4.
[0044] Movable partition 28 includes at least one aperture 32 that
provides a passageway or conduit between an upper region 16b and a
lower region 16c of chamber 16. Aperture 32 facilitates movement of
content 14 and gas 12 across or through movable partition 28 as the
movable partition moves within chamber 16. The movable partition
includes at least one and preferably a plurality of apertures 32.
In one or more embodiments, at least 2 apertures, or at least 4
apertures or at least 8 apertures are used. Aperture size and
number will vary depending on dispensing conditions, such as for
example, the content viscosity and canister pressure. Optionally,
apertures 32 may be configured as a matrix of apertures or in a
geometric configuration resembling that of a sieve. Aperture 32
typically has a dimension inversely proportional to the pressure of
gas 12 in container 10 and proportional to the viscosity of content
14. In one or more embodiments, aperture 32 may have a dimension
substantially approximating 0.1%-3% of the surface area of movable
partition 28. In certain embodiments, aperture 32 may have a
dimension substantially approximating 1% of the surface area of
movable partition 28. In one or more embodiments, a plurality of
movable partitions may be used, and may include a variety of
apertures 32, depending on the viscosity of content 14 and the
pressure of gas 12 in container 10.
[0045] A biasing element 34 optionally may be attached to or
integrally formed with movable partition 28 in order to provide an
additional opposing force on movable partition 28 as it is
displaced substantially vertically in chamber 16. Exemplary biasing
means include springs that can be attached to a lower surface 28a
of movable partition 28 or a weight (not shown) that can be
attached to the upper (28a) or lower (28b) surface of the movable
partition [others?]. Biasing means serves the additional purpose of
keeping the movable partition in its rest position between dosing.
This can be particularly helpful to avoid movement during
handling.
[0046] The upper conduit 18 is in fluid communication with valve
26. Lever 22 is disposed between upper conduit 18 and valve 26. By
applying an external pressure to lever 22, the lever moves between
a first (open) and second (closed) position. In the closed
position, the passageway between conduit 18 and valve 26 is blocked
and contents of container 10 are isolated from the exterior. In the
open position, valve 26 is in fluid communication with the
container interior and the contents of container 10 may be
dispensed from the container through valve 26.
[0047] An extension tube 33 may be attached to or integrally formed
with valve 26 for readily facilitating insertion of tube 33 to
various hard to reach areas including but not limited to any
vaginal application or any other application to a body orifice.
[0048] The operation of the pressurized container to deliver a
metered dose is now described with reference to FIGS. 2-5, in which
like elements are similarly labeled.
[0049] The container at rest is illustrated in FIG. 2. Pressure in
container 10 by gas 12 forces content 14 into the lower conduit 20,
into chamber 16 and further into the upper conduit 18, where
further flow is blocked by closed valve 26 (shown schematically in
FIG. 2).
[0050] Referring now to FIG. 3, when valve 26 is opened, for
example, by pressing lever 22 (not shown), the pressure difference
between chamber 16 and the ambient causes content 14 to flow
through valve 26 and to be discharged from the container, as is
indicated by arrow 50. As material is discharged from chamber 16,
movable partition 28 advances along with the discharging material
vertically upward through chamber 16 towards the chamber exit, as
is indicated by arrow 52. The pressurized gas 12 forces addition
material 14 upward through lower conduit 20 and into chamber 16 to
replace the material that has been discharged, as is indicated by
arrows 54.
[0051] Discharge continues until sealer 30 contacts and seals
opening 18a and halts material flow from the container (or until
the user releases lever 22 thereby closing valve 26), as is shown
in FIG. 4. For the purpose of improved sealing between movable
partition 28 and/or sealer 30 and/or upper conduit 18, a shoulder
36 is attached to or integrally formed with chamber 16 and or upper
conduit 18 such that a tapered seal is formed. A similar effect can
be achieved by downwardly sloping the top surface of the chamber.
In one or more embodiments, shoulder 36 contacts movable partition
28 and halts its upward movement before it reaches the end of the
chamber. Shoulders 36 may provide spacing between the movable
partition and chamber exit 18a, which may be desirable, for
example, in providing an optimal seal between sealer 30 and upper
conduit 18. Bias 34, e.g., a spring, which is fixed at both ends,
e.g., on the lower surface 28a of the partition and on the floor
16d of the chamber, extends with the partition as it advances
through the metering chamber.
[0052] Once sealer 30 seals opening 18a, material discharge stops.
Thus, a measured dose is dispensed that corresponds to the volume
displaced by the movable partition as it traverses from its resting
position (FIG. 2) to its sealing position (FIG. 4). Once the
dispensing force ends, gravity applies a substantially downward
force on movable partition 28, and the movable partition slowly
returns to its original position at the bottom of the chamber, as
indicated by arrows 70. See FIG. 5. Optionally, bias element 34
applies downward force to the movable partition. Apertures 32 in
movable partition 28 reduce resistance of the movable partition to
downward displacement by permitting gas 12 and/or content 14 flow
through aperture 32, as indicated by arrows 72. The chamber is
thereby "reset" for a subsequent metered release of content 14.
One-way valve 31 permits flow of gas into metering chamber 16 to
maintain pressure equilibrium, as indicated by arrow 74.
[0053] Container 10 is capable of discharging a metered dose even
when inverted since chamber 16 is substantially filled with content
14 prior to inverted.
[0054] FIG. 6 is a top plan view of movable partition 28 according
to one or more embodiments of the present invention. Movable
partition 28 includes sealer 30 attached to or integrally formed
with movable partition 28. Sealer 30 may be located anywhere in the
face of the movable partition, so long as it is vertically aligned
with outlet conduit 18. Release apertures 32 may be located
anywhere in the face of the movable partition, and are shown here
at the circumferential edge of the movable partition 28. In one or
more embodiment, a weight 38 is attached to or integrally formed
with the movable partition. Weight 38 is constructed of a material
having a high specific weight such that enhances the effect of
gravity on movable partition 28. Also shown is bias element 34,
which may be secured to one or more faces of the movable partition.
Bias element 34 is desirably arranged to apply an even or a uniform
force across the face of the movable partition.
[0055] FIG. 7 shows an alternative embodiment of the present
invention that is capable of charging and discharging while
inverted. As above, container 10 includes gas 12 and content 14
under pressure created by gas 12. Container 10 includes a metering
chamber 16 attached to, or integrally formed with, an upper conduit
18 and a lower conduit 20. Lower conduit 20 is attached to or
integrally formed with an inversion conduit 35 immersed in or in
fluid communication with content 14 such that gas 12 readily
displaces content 14 through inversion conduit 35 into chamber 16
and through upper conduit 18, pursuant to a user downwardly
displacing a lever 22, which is attached to or integrally formed
with upper conduit 18. A user can readily release content 14 from
container 10 by depressing an upper surface of lever 22, thereby
opening a valve 26 attached to or integrally formed with lever
22.
[0056] Movable partition 28 is situated in chamber 16 such that a
complimentary vertical displacement of movable partition 28 occurs
as content 14 is displaced by gas 12. Movable partition 28 includes
a sealer 30 for substantially sealing upper conduit 18 and at least
one release aperture 32. For the purpose of improved sealing
between movable partition 28 and/or sealer 30 and/or upper conduit
18, a shoulder 36 is attached to or integrally formed with chamber
16 and or upper conduit 18 such that a tapered seal is formed. A
bleed hole or a unidirectional valve 31 is provided for readily
facilitating the flow of air back into upper conduit 18.
Optionally, an extension tube 33 may be attached to or integrally
formed with valve 26 for readily facilitating insertion of tube 33
to various hard to reach areas including but not limited to any
vaginal application or any other application to a body orifice.
[0057] Material is discharged in a sequence of steps similar to
those shown in FIGS. 2-5, except that the canister is inverted at
least during charge and optionally during discharge. By depressing
lever 22, content 14 is discharged and movable partition 28 is
displaced substantially vertically within chamber 16 until sealer
30 seals upper conduit 18 or until the user release lever 22
thereby closing valve 26. In one or more embodiments, the container
is righted, so that gravity applies a substantially vertical force
on movable partition 28. As such, gas 12 and/or content 14 "bleed"
through aperture 32 formed in movable partition 28, thereby readily
facilitating substantially downward vertical displacement of
movable partition 28 within chamber 16 and "resetting" chamber 16
for any subsequent controlled release of content 14. In one or more
embodiments, the container remains inverted and bias element 34
applies sufficient force to pull the movable partition back to its
resting position.
[0058] Thus, inversion of container 10 during application does not
impede proper application of content 14 due to chamber 16 being
substantially filled with content 14 prior to discharge and
inversion conduit 35 remaining immersed in content 14 to charge
chamber 16.
[0059] In another aspect of the present invention, a foam
applicator is provided that permits easy, even application of foam
over the target surface without the need to use hands or other
implements, e.g., a brush. The foam applicator may be used with the
metered dose container described herein, or it can be used with
conventional containers. For the purposes of illustration, the
applicator is described using a conventional container, where like
numbers indicate similar elements.
[0060] Turning now to the drawings, FIG. 8 shows a container 80
including a content 14 under pressure created by gas 12. As noted
above, the container 80 is hollow body which may be made from any
material, for example, aluminum, tin-plate, plastics including
polyethylene terephthalate (PET), oriented polypropylene (OPP),
polyethylene (PE) or polyamide and including mixtures, laminates
and the like. The interior surface of the metal container may be
laminated with a plastic material or coated with a lacquer or with
a varnish to protect the interior surface of the container from
corrosion. Corrosion may weaken the container and may also lead to
a discoloration of the container's content. Preferred plastic
materials for lamination and lacquers or varnishes for coating are
epoxy phenolic, polyamide imide, organosol, PET, PP, PE or a
combination thereof.
[0061] As noted above, content 14 is flowable and can be a liquid
or a semi-liquid. Content 14 includes components to provide the
desired functionality of the foam upon administration, as well as
additives that promote foam formation, such as surfactants and
propellant. Aerosol propellants are used to generate and administer
the foamable composition as a foam. The total composition including
propellant, foamable compositions and optional ingredients is
referred to as the foamable carrier. The propellant makes up about
3% to about 25 wt % of the foamable carrier. Examples of suitable
propellants include volatile hydrocarbons such as butane, propane,
isobutane or mixtures thereof, and fluorocarbon gases. In one or
more embodiments, the propellant is a liquefied gas, such as
butane, propane, isobutane or mixtures thereof. The liquefied gas
typically forms a solution or emulsion with the other components of
content 14 and is in equilibrium with propellant gas, which
occupies a volume of the container (e.g., the "head space") and
generates the internal pressure used to discharge the product from
inside the container. Furthermore, the gas expands to form many
"bubbles" within the composition thereby creating the foam. The
quantity of gas contained in the container is such to that
substantially all the product can be expelled out of the container
throughout the life of the article at the correct pressure. The
quantity also depends from the type of gases used.
[0062] A dipstick 86 is immersed in or in fluid communication with
content 14, thereby readily facilitating flow of liquids, fluids
and gas from the interior of the container 80. In order to deliver
the majority of the content from the container, dipstick 86 extends
a distance into the region of container where content 14 resides.
In some embodiments, dipstick 86 extends substantially to a floor
80a of container 80.
[0063] The upper opening of dipstick 86 is in fluid communication
with valve 88. Lever 89 is disposed between dipstick 86 and valve
88. By applying an external pressure to lever 89, the lever moves
between a first (open) and second (closed) position. In the closed
position, the passageway between dipstick 86 and valve 88 is
blocked and contents of container 80 are isolated from the
exterior. In the open position, valve 88 is in fluid communication
with the container interior and the contents of container 80 may be
dispensed from the container through valve 88.
[0064] A semi-resilient extension tube 83 may be attached to or
integrally formed with valve 88 to permit flow of content 14
through aperture 85 formed in applicator head 81. The applicator
head 81 provides a smooth application surface that can be used to
evenly distribute foam over a target surface.
[0065] Tube 83 may contain some flexibility, however, it should be
sufficiently stiff to withstand forces exerted by the applicator
while spreading foam over the target surface. Applicator head 81
may be a resilient, semi-resilient characteristic, pliable or soft.
Applicator head 81 can be made of a vulcanized material, a
rubber-like material, silicone, or other polymers. The applicator
can include a plasticizer to provide the desired material or
mechanical properties. In one or more embodiments, applicator head
81 is smooth so that it is not unpleasant to the user. In one or
more embodiments, applicator is semi-resilient and/or smooth and is
conducive to even, smooth application of content 14. As such,
applicator 81 is geared towards assisting in the application of
content 14 such that the user does not need to use a hand or a
finger to apply content 14.
[0066] Several advantages are achieved by using applicator head 81
to apply content 14 to any desired surface, including but not
limited to, the user not being required to use their hands both for
hygienic, aesthetic or comfort reasons. Clearly, if content 14 is
to be applied to an intimate area of the body or an orifice of the
body, the user may prefer not to have to use their hands or fingers
to apply content 14 thereto. By way of example only, a focus group
of mothers has expressed the view that applying material to baby's
behinds is an unpleasant task when performed with their uncovered
hands. Thus, use of applicator head 81 to apply material in such a
fashion readily alleviates such concerns as those raised by the
mother's focus group. Furthermore, applicator head 81 is especially
preferred when content 14 contains a medication or material that
should not come into general contact with the user. Applicator head
81 can be readily used to apply content 14 to any desired surface
including, but not limited to, any area afflicted by a disease,
abnormality, cut, wound, pathogen, bacillus, virus, bacterium,
micro-organism, infection and ailment.
[0067] FIG. 9 shows a further embodiment of the foam applicator
according to the present invention. The applicator system includes
a semi-resilient extension tube 90 attached to or integrally formed
with valve 92 for readily facilitating flow of content 14 to
applicator head 94. Applicator head 94 includes a hollow member 96
equipped with a plurality of openings 98. Upon release of content
14, applicator head 94 is used to readily apply content 14 on the
intended surface. During use, foamed content is delivered from
applicator head 94, into hollow member 96, and through openings
98.
[0068] Applicator head 94 may be resilient, semi-resilient
characteristic, pliable or soft. Applicator head 94 may be made
from a vulcanized material, a rubber-like material, silicone, or
other polymers. The applicator head 94 can include a plasticizer to
provide the desired material or mechanical properties. In one or
more embodiments, hollow body 96 has a smooth surface 96a that
contains openings 98 so that it is not unpleasant to the user.
Openings 98 are formed in the hollow body 96 such that its face 96a
is smooth. Applicator head 94 can be attached to, or integrally
formed with, any foam container and or retrofitted to any existing
foam container.
[0069] FIG. 10 shows a further embodiment of the foam applicator
according to the present invention. The applicator system includes
a semi-resilient extension tube 100 that is attached to or
integrally formed with valve 102 to permit flow of content 14
through extension tube 100. Flap 104 is attached to or integrally
formed at the opposing end of extension tube 100 such that flap 104
serves as applicator of content 14 as it exits extension tube
100.
[0070] Flap 104 may be resilient, semi-resilient characteristic,
pliable or soft, and may be made from a vulcanized material, a
rubber-like material, silicone, or other polymers. The applicator
can include a plasticizer to provide the desired material or
mechanical properties. In one or more embodiments, flap 104 is
smooth and pliant so that it is not unpleasant to the user.
[0071] In one or more embodiments, the applicator can be
retrofitted to any existing foam container.
[0072] It will be appreciated that the above descriptions are
intended to only serve as examples, and that many other embodiments
are possible within the spirit and scope of the present
invention.
* * * * *