U.S. patent application number 12/092689 was filed with the patent office on 2009-09-03 for continuously sealing one way valve assembly and fluid delivery system and formulations for use therein.
This patent application is currently assigned to ReSeal International Limited Partnership. Invention is credited to Greg Pardes, Stewart Swiss.
Application Number | 20090218373 12/092689 |
Document ID | / |
Family ID | 38023825 |
Filed Date | 2009-09-03 |
United States Patent
Application |
20090218373 |
Kind Code |
A1 |
Pardes; Greg ; et
al. |
September 3, 2009 |
CONTINUOUSLY SEALING ONE WAY VALVE ASSEMBLY AND FLUID DELIVERY
SYSTEM AND FORMULATIONS FOR USE THEREIN
Abstract
A reusable continuously sealing one-way valve assembly and
delivery system flows a sterile flowable substance from a source to
an outlet orifice and prevents any backflow of contaminants through
the continuously sealing one way valve assembly when the flowable
substance ceases to flow. The valve assembly includes an
elastomeric membrane which aids in preventing any backflow of
contaminants when dispensing of the flowable substance is stopped.
Multiple dosing of preservative-free flowable substance is
provided.
Inventors: |
Pardes; Greg; (New York,
NY) ; Swiss; Stewart; (Lloyd Harbor, NY) |
Correspondence
Address: |
KRAMER LEVIN NAFTALIS & FRANKEL LLP;INTELLECTUAL PROPERTY DEPARTMENT
1177 AVENUE OF THE AMERICAS
NEW YORK
NY
10036
US
|
Assignee: |
ReSeal International Limited
Partnership
New York
NY
|
Family ID: |
38023825 |
Appl. No.: |
12/092689 |
Filed: |
November 3, 2006 |
PCT Filed: |
November 3, 2006 |
PCT NO: |
PCT/US06/42940 |
371 Date: |
January 20, 2009 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
60823462 |
Aug 24, 2006 |
|
|
|
Current U.S.
Class: |
222/494 |
Current CPC
Class: |
B65D 47/18 20130101;
Y02W 30/80 20150501; Y02W 30/807 20150501; B65D 47/205
20130101 |
Class at
Publication: |
222/494 |
International
Class: |
B65D 5/72 20060101
B65D005/72 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 11, 2005 |
US |
11267868 |
Claims
1. A continuously sealing one way valve assembly and delivery
system for dispensing a flowable substance, comprising: a source
for storage of the flowable substance, the source having an
opening; a valve assembly coupled to the opening of the source,
said valve assembly including (i) an inner core having an inlet
opening for receiving the flowable substance into a passageway and
at least one port opening from the passageway, (ii) a hollow
flexible membrane having a first end and a second end, the first
end being thicker than the second end, wherein the hollow flexible
membrane is fitted over an outer surface of the inner core and when
the flowable substance is placed under pressure the flowable
substance exits through the at least one port opening and expands
said membrane outwardly from said outer surface of said inner core;
a cover enclosing the flexible membrane and having an outlet
orifice for dispensing the flowable substance from the valve
assembly when pressure is applied to the flowable substance and
wherein when the pressure on the flowable substance is released,
the first end of the hollow flexible membrane moves back into
tightly fitting contact with the outer surface of the inner core
before the remainder of the hollow flexible membrane moves back
into tightly fitting contact with the outer surface of said inner
core.
2. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein the hollow flexible
membrane has an axially extending uninterrupted continuous band at
the first end of the hollow flexible membrane adjacent the outlet
orifice in the cover and completely encircling the core.
3. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein said membrane has a
radially outwardly extending flange at the second end thereof
adjacent to the passageway of the inner core, and the cover also
has a radially outwardly extending flange pressing the flange on
the membrane into fluid tight contact with a radially outwardly
extending flange at the passageway opening into the inner core.
4. A continuously sealing one way valve assembly and delivery
system as set forth in claim 3, wherein a collar and connector
member on the source secure the valve assembly to the source.
5. A continuously sealing one way valve assembly and delivery
system as set forth in claim 4 wherein the connector member is a
threaded screw which mates to the collar.
6. A continuously sealing one way valve assembly and delivery
system as set forth in claim 4 wherein a collar and connector
member on the source secure the valve assembly to the source and
effect a positive lock preventing opening of the source.
7. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein the outlet orifice in the
cover is arranged so that it can dispense a selected quantity of
the flowable substance.
8. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein the outlet orifice in the
cover is formed of a soft material.
9. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein the outlet orifice in the
cover is formed of a flexible material.
10. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein the cover is formed of an
inner axially extending flexible member laterally enclosed by an
axially extending rigid plastic shell.
11. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein an overcap is arranged to
fit over and form a seal with said valve assembly sufficient to
prevent external contamination from coming in contact with the
valve assembly during storage.
12. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein at least two ports extend
from the passageway through the inner core and to the inner surface
of the flexible membrane.
13. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein the source comprises a
collapsible reservoir reducible in volume in proportion as the
flowable substance is dispensed from of the collapsible
reservoir.
14. A continuously sealing one way valve assembly and delivery
system as set forth in claim 13, wherein said collapsible reservoir
is one of a bellows, a tube and an internal bag.
15. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein an axially extending
housing laterally encloses the source.
16. A continuously sealing one way valve assembly and delivery
system as set forth in claim 15, wherein the housing has a slot
extending in the axial direction for applying dispensing pressure
to an actuator of the collapsible reservoir.
17. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein the cover has a closed
outlet orifice which opens for dispensing the flowable substance
from the cover when dispensing pressure is applied to the
source.
18. A continuously sealing one way valve assembly and delivery
system, as set forth in claim 17, wherein the outlet orifice in the
cover is impervious to the flowable substance and does not retain
the flowable substance inwardly of the outlet orifice.
19. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1 wherein the inner core is connected
to a pump assembly and to an actuator such that flowable substance
is dispensed from the outlet orifice when the actuator is
depressed.
20. A one-way valve assembly and delivery system of claim 1,
wherein the source is filled with a preservative free product.
21. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product is selected from one of
opthalmological products, otorhinolarygological products,
dermatological products, gynecological products, and products for
the treatment or prevention of anorectal disorders, dermatological
disorders, pulmonary disorders or any product which can be
administered to the body through mucus membranes.
22. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of methycellulose, hyaluronic acid, polyethelene glycol
400 0.4%, propylene glycol 0.3%, glycerin, and mineral oils.
23. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of timolol 0.25%/0.50%, brimonidine tartrate 0.1%,
bimatoprost 0.03% and travaprost 0.004%.
24. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of olopatadine HCL 0.1% and prednisolone acetate 1%.
25. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of ketorolac 0.5% and diclofenac 0.1%.
26. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of phenylephrine 0.25% and pseudoephedrine 30 mg.
27. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of skin preparations; scalp preparations; corticosteroid
creams, lotions and ointments; topical antibiotics and topical
anti-fungal agents.
28. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of skin preparations; scalp preparations; corticosteroid
creams, lotions and ointments; topical antibiotics; topical
anti-fungal agents; therapeutic skin creams including
anti-bacterial, anti-fungal/parasitic, allergic and non-specific
dermatitis creams and emollients and cosmetic dermatologic
compounds used for dermatologic disorders
29. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of creams, topical anaesthetics, lubricating jellies and
other preparations for hemorrhoid treatment, prevention or
management.
30. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of B-adrenergic, anticholinergic, corticosteroid and
theophyline derivatives.
31. A one-way valve assembly and delivery system of claim 20
wherein said preservative-free product comprises a product selected
from one of azoles, nystatins, butoconazole, butoconalzole 2%,
clotrimazole, clotrimazole 1%, metronidazole and trichomonas
treatments.
32. A one-way valve assembly and delivery system of claim 19,
wherein said product is a contact lens care product.
33. A one-way valve assembly and delivery system of claim 19,
wherein said product is selected from one of: herbal, cosmetic, eye
wash or skin care products.
34. A continuously sealing one way valve assembly and delivery
system as set forth in claim 1, wherein the continuously sealing
one way valve assembly and delivery system can dispense multiple
doses of preservative-free product.
35. A continuously sealing one way valve assembly and delivery
system for dispensing a preservative-free flowable substance,
comprising: a source for storage of the preservative-free flowable
substance, the source having an opening; a valve assembly coupled
to the opening of the source, said valve assembly including (i) an
inner core having an inlet opening for receiving the
preservative-free flowable substance into a passageway and at least
one port opening from the passageway, (ii) a hollow flexible
membrane having a first end and a second end, the first end being
thicker than the second end, wherein the hollow flexible membrane
is fitted over an outer surface of the inner core and when the
preservative-free flowable substance is placed under pressure the
preservative-free flowable substance exits through the at least one
port opening and expands said membrane outwardly from said outer
surface of said inner core; a cover enclosing the flexible membrane
and having an outlet orifice for dispensing the preservative-free
flowable substance from the valve assembly when pressure is applied
to the preservative-free flowable substance and wherein when the
pressure on the preservative-free flowable substance is released,
the first end of the hollow flexible membrane moves back into
tightly fitting contact with the outer surface of the inner core
before the remainder of the hollow flexible membrane moves back
into tightly fitting contact with the outer surface of said inner
core.
36. A continuously sealing one way valve assembly and delivery
system for dispensing multiple doses of a preservative-free
flowable substance, comprising: a source for storage of the
preservative-free flowable substance, the source having an opening;
a valve assembly coupled to the opening of the source, said valve
assembly including (i) an inner core having an inlet opening for
receiving the preservative-free flowable substance into a
passageway and at least one port opening from the passageway, (ii)
a hollow flexible membrane having a first end and a second end, the
first end being thicker than the second end, wherein the hollow
flexible membrane is fitted over an outer surface of the inner core
and when the preservative-free flowable substance is placed under
pressure the preservative-free flowable substance exits through the
at least one port opening and expands said membrane outwardly from
said outer surface of said inner core; a cover enclosing the
flexible membrane and having an outlet orifice for dispensing the
preservative-free flowable substance from the valve assembly when
pressure is applied to the preservative-free flowable substance and
wherein when the pressure on the preservative-free flowable
substance is released, the first end of the hollow flexible
membrane moves back into tightly fitting contact with the outer
surface of the inner core before the remainder of the hollow
flexible membrane moves back into tightly fitting contact with the
outer surface of said inner core.
37. A delivery system comprising: a source for storage of a
flowable substance, the source having an opening; a valve assembly
coupled to the opening of the source, said valve assembly including
(i) an inner core having an inlet opening for receiving the
flowable substance into a passageway and at least one port opening
from the passageway, (ii) a hollow flexible membrane having a first
end and a second end, the first end being thicker than the second
end, wherein the hollow flexible membrane is fitted over an outer
surface of the inner core and when the flowable substance is placed
under pressure the flowable substance exits through the at least
one port opening and expands said membrane outwardly from said
outer surface of said inner core; a cover enclosing the flexible
membrane and having an outlet orifice for dispensing the flowable
substance from the valve assembly when pressure is applied to the
flowable substance and wherein when the pressure on the flowable
substance is released, the first end of the hollow flexible
membrane moves back into tightly fitting contact with the outer
surface of the inner core before the remainder of the hollow
flexible membrane moves back into tightly fitting contact with the
outer surface of said inner core.
38. A continuously sealing one way valve assembly and delivery
system for dispensing a flowable substance, comprising: a source
for storage of the flowable substance, the source having an
opening; a valve assembly coupled to the opening of the source,
said valve assembly including (i) an inner core having an inlet
opening for receiving the flowable substance into a passageway and
at least one port opening from the passageway, (ii) a hollow
flexible membrane having a first end and a second end, the first
end being thicker than the second end, wherein the hollow flexible
membrane is fitted over an outer surface of the inner core and when
the flowable substance is placed under pressure the flowable
substance exits through the at least one port opening and expands
said membrane outwardly from said outer surface of said inner core;
a cover enclosing the flexible membrane and having an outlet
orifice for dispensing the flowable substance from the valve
assembly when pressure is applied to the flowable substance and
wherein when the pressure on the flowable substance is released,
the first end of the hollow flexible membrane moves back into
tightly fitting contact with the outer surface of the inner core
before the remainder of the hollow flexible membrane moves back
into tightly fitting contact with the outer surface of said inner
core, and wherein at least one of said inner core, hollow flexible
membrane and cover comprises an antimicrobial material.
39. A one-way valve assembly and delivery system of claim 38,
wherein said antimicrobial material is selected from one of silver
ions contained within a ceramic carrier and sustained-release ionic
silver compounds.
40. A continuously sealing one way valve assembly and delivery
system for dispensing a flowable substance, comprising: a source
for storage of the flowable substance, the source having an
opening; a valve assembly coupled to the opening of the source,
said valve assembly including (i) an inner core having an inlet
opening for receiving the flowable substance into a passageway and
at least one port opening from the passageway, (ii) a hollow
flexible membrane having a first end and a second end, the first
end being thicker than the second end, wherein the hollow flexible
membrane is fitted over an outer surface of the inner core and when
the flowable substance is placed under pressure the flowable
substance exits through the at least one port opening and expands
said membrane outwardly from said outer surface of said inner core;
a cover enclosing the flexible membrane and having an outlet
orifice for dispensing the flowable substance from the valve
assembly when pressure is applied to the flowable substance and
wherein when the pressure on the flowable substance is released,
the first end of the hollow flexible membrane moves back into
tightly fitting contact with the outer surface of the inner core
before the remainder of the hollow flexible membrane moves back
into tightly fitting contact with the outer surface of said inner
core, and wherein at least one of said hollow flexible membrane and
cover comprises a hydrophobic material.
41. A one-way valve assembly and delivery system of claim 40,
wherein said hydrophobic material is selected from one of
positively charged material, low friction material, high surface
tension material, or anti-wetting material.
42. A one-way valve assembly and delivery system of claim 41,
wherein said wherein said low friction material is Teflon.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to U.S. patent application
Ser. No. 11/267,868, filed Nov. 3, 2005, and U.S. Provisional
Patent Application Ser. No. 60/823,462, filed Aug. 24, 2006, each
of which are incorporated by reference herein in their
entirety.
FIELD OF THE INVENTION
[0002] The present invention is directed to a dispensing and
delivery system including a continuously sealing one way valve
assembly for dispensing a sterile flowable substance, which can
include preservatives or be preservative free, while preventing a
backflow of contaminants into the source of the flowable substance.
The dispensing and delivery system includes, for example, a valve
assembly enclosed by a pressure displaceable flexible member or
elastomeric member for effecting the passage of the flowable
substance to a controllable outlet, while preventing any backflow
to the source of the flowable substance after dispensing individual
portions or doses of the flowable substance.
BACKGROUND INFORMATION
[0003] In the past, to maintain the flowable substance free of
contaminants, preservatives have been mixed in with the flowable
substance in the reservoir from which it is to be dispensed. The
use of preservatives tends to be detrimental to users and often
limits the effectiveness of the flowable substance, particularly
when the flowable substance is a pharmaceutical such as an eye care
solution, an intranasal drug, cosmetic treatment or skin treatment
product. This group of prescription and nonprescription medications
are often formulated with preservatives in multi-dose formats. The
flowable substance may also be a food stuff, a beverage, a
nutraceutical or cosmeceutical product.
[0004] Another consideration is the ability of the valve assembly
to deliver a selected amount of the flowable substance to the
outlet without causing any damage to the user, such as when
applying an eye care solution directly into the eye.
[0005] In the past, flexible membranes have been used to control
the flow of the flowable substance to the valve assembly outlet
while preventing any backflow to the source of the flowable
substance. However such valves, such as the valve described in U.S.
Pat. No. RE34,243, which is incorporated by reference herein in its
entirety, describe the use of O-rings in conjunction with a
uniformly thick flexible membrane to effect a seal. Other valve
assemblies also used cylindrical parts which required, for example,
sliding the pretensioned flexible membrane over the straight sided
core during assembly, preventing automated high speed assembly.
Therefore, an effectively designed valve assembly which was able to
be manufactured, for example via high speed automated production,
and limited the costs of manufacture by reducing component parts
and allowing the use of high speed automated production, was not
provided in the past.
SUMMARY OF THE INVENTION
[0006] According to an exemplary embodiment of the present
invention, a dispensing and delivery system conveys a flowable
substance from a closed source, such as a collapsible reservoir,
while preventing any backflow of oxygen or other contaminants from
the ambient atmosphere through the valve assembly and into the
source of the flowable substance after a portion of the substance
has been dispensed.
[0007] The collapsible reservoir can be, for example, a bellows
type reservoir, a collapsible tube, an internal bag or other type
of suitable reservoir designed to dispense practically all of its
contents. According to an exemplary embodiment of the present
invention, the dispensing delivery system has a normally closed
controllable outlet orifice for dispensing a controlled amount of
the flowable substance out of the valve assembly. The reservoir is
in sealed contact with the valve assembly so that its contents do
not receive any contaminants when the flowable substance is
dispensed.
[0008] Dispensation of the flowable substance is effected by
applying pressure to a reservoir directly or through a pump so that
its contents flow to and through the valve assembly. The contents
may be, for example, a pharmaceutical, such as an eye care solution
or other substance which is to be kept free of contaminants during
dispensing. According to an exemplary embodiment of the present
invention, a multiple number of dispensed amounts can be provided
while keeping the undispensed flowable substance preservative-free.
Other flowable substances which are preservative-free can be food
stuffs, juices or beverages, cosmetics, or other flowable
substances intended to be maintained free of preservatives and
contaminants, notwithstanding multiple uses of the dispenser
delivery system. The flowable substance reservoir is protected by a
housing so that pressure is not accidentally applied.
[0009] The valve assembly includes, for example, an axially
extending structure open to the dispenser or reservoir of the
flowable substance. The valve assembly can be formed of an axially
extending inner core open to the reservoir and formed of a rigid
plastic component. The interior of the core can have a passageway
for receiving the flowable substance from the reservoir. At least
one port extending from the passageway can be provided and affords
an opening for conveying the flow substance out of the inner core.
The inner core can be designed with a substantially tapered or
substantially conical shape.
[0010] An axially extending flexible membrane tightly encloses the
inner core and covers the outlet end of the port through the inner
core. The flexible membrane moves outwardly from the inner core
when the flowable substance is pressurized and passes through the
port and flows toward the outlet end of the flexible membrane. The
flexible membrane is structured such that it is, for example,
thicker at the end closest to the valve opening, e.g. the flexible
membrane is not uniformly thick along its length. This thickness
allows the valve to seal at the thicker end first. Alternatively,
even if the membrane was of uniform thickness, the elasticity of
the membrane can be varied so that the portion of the membrane
closest to the valve opening is less elastic, resulting in the
portion of the membrane closest to the valve opening closing
first.
[0011] In exemplary embodiments, the flexible membrane and, as
described above, the inner core, are of a substantially tapered or
substantially conical shape, allowing for the rapid assembly and
natural resting of the flexible membrane over the inner core.
[0012] A valve cover located laterally outwardly from the flexible
membrane ends at the controllable outlet orifice. The pressurized
flowable substance travels between the radially outwardly extended
flexible membrane and the outer surface of the inner core and flows
to the controllable outlet orifice. The outlet orifice provides for
controlled amounts of the flowable substance to be dispensed. An
over cap covers the exterior of the valve cover to protect the
valve assembly during storage. A collar can join the valve assembly
to the reservoir and afford a sealed arrangement preventing any
flow of contaminants into the reservoir. The collar and the neck
area of the reservoir are designed with locking features that
permit the override of the collar during assembly but subsequently
prevent the unscrewing and disassembly of the collar and the
opening of and likely contamination of the system.
[0013] The various features of novelty which characterize the
present invention are pointed out with particularity in the claims
annexed to and forming a part of this disclosure. For a better
understanding of the present invention, its operation, advantages
and specific objects attained by its use, reference should be had
to the accompanying drawings and descriptive matter in which
preferred embodiments of the invention are illustrated and
described.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is an axially extending view of a dispensing and
delivery system according to an exemplary embodiment of the present
invention.
[0015] FIG. 2A is an exploded view of a dispensing and delivery
system such as that shown in FIG. 1 according to an exemplary
embodiment of the present invention.
[0016] FIG. 2B is an exploded view of a dispensing and delivery
system such as that shown in FIG. 1 according to an exemplary
embodiment of the present invention which includes a pump for
dispensing flowable substance.
[0017] FIG. 3 is an exploded view of the soft cover and its
controllable outlet orifice according to an exemplary embodiment of
the present invention wherein the controllable outlet orifice is a
cross slit.
[0018] FIG. 4A is an enlarged axially extending partial view of the
continuously sealing one way valve assembly with a flat topped soft
cover according to an exemplary embodiment of the present
invention.
[0019] FIG. 4B is an enlarged axially extending partial view of the
continuously sealing one way valve assembly with a rounded soft
cover according to an exemplary embodiment of the present invention
wherein the continuously sealing one way valve assembly is in the
rest position.
[0020] FIG. 4C is an enlarged axially extending partial view of the
continuously sealing one way valve assembly with a rounded soft
cover according to an exemplary embodiment of the present invention
wherein the continuously sealing one way valve assembly is in the
dispensing position.
[0021] FIG. 4D is an enlarged axially extending partial view of the
continuously sealing one way valve assembly where the opening in
the soft cover contains a portion of the flexible membrane and
inner core of the valve assembly according to an exemplary
embodiment of the present invention.
[0022] FIG. 5 is an enlarged partial axially extending view of the
continuously sealing one way valve assembly shown in FIGS. 4B and
4C according to an exemplary embodiment of the present
invention.
[0023] FIG. 6A is an axially extending partial view of the
continuously sealing one way valve assembly with one port and an
outlet port according to an exemplary embodiment of the present
invention.
[0024] FIG. 6B is an enlarged axially extending partial view of the
continuously sealing one way valve assembly with one port and an
outlet port according to an exemplary embodiment of the present
invention.
DETAILED DESCRIPTION OF THE INVENTION
[0025] As shown in FIGS. 1, 2A and 2B, dispensing and delivery
system 1 according to exemplary embodiments of the present
invention is comprised of a bellows reservoir or source 2 located
within a housing 6. The housing 6 and holds reservoir 2 of flowable
substance, preferably a sterile or pure flowable substance, a valve
assembly 3 (shown in detail in FIGS. 2A, 2B and 4A-D) for conveying
the flowable substance from the reservoir 2 to an outlet when
pressure is applied to the reservoir 2 or to an actuator 2a
connected to the reservoir 2. An over cap 15 covers the valve
assembly 3 to prevent contamination from entering the valve
assembly 3 during storage. The housing 6 has surfaces 6a for
holding the assembly. A collar 8 connects the valve assembly 3 to
the reservoir 2 affording a sealed connection so that ambient
contaminants cannot pass into the reservoir 2.
[0026] Referring again to FIGS. 1, 2A and 2B, the bellows reservoir
2 is sufficiently large to allow for multiple doses to be dispensed
from the reservoir and collapses when pressure is applied to the
reservoir. Other suitable reservoirs may be used, such as a
collapsible tube or an internal bag in a reservoir that permit
multi-dose dispensation of the flowable substance. The valve
assembly 3 and collar 8 preferably prevents air or other
contamination from entering the reservoir following the dispensing
procedure.
[0027] Referring yet again to FIGS. 1, 2A and 2B, the bellows
reservoir or source 2 is laterally enclosed, for example, by an
axially extending housing 6 to prevent the accidental application
of pressure to the reservoir. A slot 6b extending axially in the
housing 6 permits a user to gain access to an actuator 2a of the
reservoir as the flowable substance is pressed out. The housing 6
has surfaces 6a for holding the housing when the flowable substance
is being dispensed.
[0028] Referring now to FIGS. 2A and 2B, the valve assembly 3 has
valve cover 14 which encircles the flexible membrane 13. The valve
assembly 3 is comprised of an inner core 10, an axially extending
blind passageway 11, ports 12, a flexible membrane 13, a valve
cover 14 with a flange 14a, and a soft cover 7 with a controllable
outlet orifice 7a (all of which are described in greater detail
below in connection with the descriptions of FIGS. 4A-D). While the
flexible membrane 13 is hollow so as to accommodate the inner core
10, it is understood that when assembled with the device, it is
filled with the inner core 10 such that no gap remains when the
valve assembly is at rest.
[0029] The end of the valve cover 14 adjacent the reservoir 2 has a
radially outwardly extending flange 14a bearing against the flange
at the end of the flexible membrane effecting the seal for the
valve assembly at the opening from the reservoir 2. The opening or
neck area of reservoir 2 seals against flange 14a, for example, by
way of a screw thread which mates with the collar 8. Alternatively,
or in addition, the collar 8 and the opening or neck area of the
reservoir 2 are designed with locking features that permit the
override of the collar 8 during assembly but subsequently prevent
the unscrewing and disassembly of the collar 8 and the opening of
the system. This prevents any unintended contamination by the
consumer and also eliminates the possibility of refilling the
system.
[0030] Referring now especially to FIG. 2B, in an embodiment
suitable for pumping flowable substance, a pump assembly 16 is
joined to a valve assembly 3a and to a reservoir 2 and bottle 6b.
The collar 8 surrounds the connection between the pump assembly 16
and valve assembly 3a. The pump assembly 16 is connected to the
bottle 6 by screw threads. The opening or neck area of bottle 6
seals against pump assembly 16, for example, by way of a screw
thread which mates with the pump assembly 16 sealing flange 2c of
reservoir 2 between the bottle 6 and the pump assembly 16.
Alternatively, or in addition, the collar 8 and the opening or neck
area of the reservoir 2 are designed with locking features that
permit the override of the pump assembly 16 during assembly but
subsequently prevent the unscrewing and disassembly of the pump
assembly 16 and the opening of the system. This prevents any
unintended contamination by the consumer and also eliminates the
possibility of refilling the system.
[0031] The pump assembly 16 is thus connected to a valve assembly
3a having an actuator 17, an inner core 10, an axially extending
blind passageway 11, ports 12, a flexible membrane 13, a valve
cover 14 with a flange 14a, and a soft cover 7 with a controllable
outlet orifice 7a (further described below in connection with the
descriptions of FIGS. 4A-D). Optionally, the actuator 17 may be
connected to or include an atomizer. In operation the actuator 17
serves to transfer force via a check valve of the pump assembly 16
to draw flowable substance from the reservoir 2, thus providing the
force necessary to dispense flowable substance. For example,
conventional pumps may be utilized in this manner.
[0032] Furthermore, the reservoir 2 can be disposed within a bottle
6 whose open end is sealed by a plug 2c. Plug 2c serves to protect
the reservoir 2 from damage, rupture or inadvertent application of
force on the reservoir 2.
[0033] Referring now to FIG. 3, the controllable outlet orifice 7a
is a cross-slit enabling substantially dripless dispensing of the
flowable substance. The cross-slit causes the controllable outlet
orifice 7a to self close on itself after pressure is released.
[0034] The controllable outlet orifice 7a can be formed as desired
to provide a spray or a stream of the flowable substance.
Alternatively, by selectively dimensioning the controllable outlet
orifice 7a, a drop-like amount of the flowable substance can be
dispensed, for example if an eye care solution is being dispensed.
If a greater amount of the flowable substance is to be dispensed,
the controllable outlet orifice 7a can be formed for dispensing a
larger quantity of the flowable substance, for example, a eye or
nasal solution and/or gel.
[0035] Referring now to FIGS. 4A-D, the valve assembly 3 preferably
has an inner core 10, an axially extending blind passageway 11,
ports 12, a flexible membrane 13, a valve cover 14 with a flange
14a, and a soft cover 7 with a controllable outlet orifice 7a. An
over cap 15 is placed over the valve assembly 3 when it is not in
use, protecting it from contact with ambient contaminants.
[0036] In the valve assembly 3, an axially extending inner core 10
bears against the opening of the reservoir 2 so that flow from the
reservoir enters into an axially extending blind passageway 11 in
the inner core. The passageway 11 extends for a major portion of
the axial length of the inner core. At approximately half the
length of the passageway 11, the inner core has a pair of ports 12
extending transversely of the passageway axis from the surface of
the passageway to the outer surface of the inner core 10. The inner
core 10 is formed of, for example, a rigid plastic material and
terminates inwardly of the outlet end of the valve assembly.
Furthermore, in exemplary embodiments, upon assembly and filling of
the assembly no air is present inside the passageway 11 and the
ports 12. It should be noted that additional ports 12 may be
located through the inner core 10.
[0037] Furthermore, in exemplary embodiments the inner core 10 and
the flexible membrane 13 are constructed such that they fit tightly
together, for example having very close tolerances which allow for
an air-tight seal to be formed between the flexible membrane 13 and
the inner core 10. In further exemplary embodiments the molding
process for the flexible membrane 13 and the inner core 10, as well
as other components described above as sealing against one another
is an asymmetric molding process which creates a surface
substantially free of defects or seam lines at the areas of contact
where sealing occurs. Accordingly, in an exemplary embodiment, very
close tolerances between the parts, for example the inner core 10
and flexible membrane 13 and the other parts, are used to provide
an optimal seal and operation of the valve assembly.
[0038] A flexible membrane 13, such as an elastomeric member, is
fitted tightly over the outer surface of the inner core and extends
from the opening in the reservoir 2 to the opposite end of the
inner core 10. As can be noted in FIGS. 4A-D, the thickness of the
membrane is preferably variable along its axial length. In the
region of the outlet end of the inner core has, for example, an
axially extending continuous uninterrupted end considerably thicker
than the remainder of the flexible membrane 13. That is, the band
is not separated in the axial direction by axially extending cuts.
The thicker end ensures that after the valve has dispensed fluid,
as further described below, the valve closes at the end closest to
the opening 7a first, therefore preventing any backflow. This is
effected by the heavy wall thickness which provides for greater
tension. As a result, the flexible membrane 13 exhibits non-uniform
tension.
[0039] In a further example, in yet other embodiments, the
thickness of the membrane may be variable along its axial length
and the region surrounding the outlet end of the inner core has,
for example, an axially extending continuous uninterrupted annular
band considerably thicker than the remainder of the flexible
membrane 13. Furthermore, in certain embodiments, the band is not
separated in the axial direction by axially extending cuts.
Alternatively, the elasticity or durometer of the end of the
flexible membrane closest to the valve opening may be varied, for
example it may be reduced, such that the end closest to the valve
opening seals first when pressure is relieved.
[0040] In a further embodiment, flexible membrane 13 and inner core
10 are substantially tapered or substantially conical at the ends
closest to the controllable outlet orifice 7a such that the inner
core 10 nest into the flexible membrane 13 one another when being
assembled by high speed automated production equipment.
[0041] At its end adjacent to the opening of the reservoir 2, the
flexible membrane 13 has an outwardly extending flange bearing
against a flange on the inner core located at the opening from the
reservoir.
[0042] An axially extending valve cover 14 encircles the flexible
membrane 13 and, as shown in the rest position in FIG. 2a, is
spaced radially outwardly from the outer surface of the flexible
membrane. The end of the valve cover 14 adjacent the reservoir 2
has a radially outwardly extending flange 14a bearing against the
flange at the end of the flexible membrane effecting the seal for
the valve assembly at the opening from the reservoir 2.
[0043] The valve cover 14 is formed, for example, of an inner layer
of an elastomeric material extending axially from its flange 14a to
and over the outlet end of the valve assembly 3. Elastomeric
material forms a soft cover 7 over the outlet end of the valve
cover 14 which is particularly advantageous when the valve assembly
is used for dispensing an eye care solution. Such a soft cover 7
prevents, for example, any likelihood of harm to the delicate outer
surfaces of the eye or surrounding tissue. The soft cover 7 has a
controllable outlet orifice 7a for dispensing the flowable
substance. The outlet orifice is closed in the rest position of the
continuously sealing one way valve assembly and open in the
dispensing position.
[0044] Referring yet again to FIGS. 4A-D and to FIG. 5, various
embodiments of the valve assembly 3 are depicted having variations
in the structure of the soft cover 7 as described below.
[0045] Referring now especially to FIG. 4A, a valve assembly having
a flat topped soft cover 7 is provided. The soft cover 7 has a
flattened top, which allows for less flowable substance to adhere
to the controllable outlet orifice 7a because the flattened top
results in a shorter controllable outlet orifice 7a. The soft cover
7 has a controllable outlet orifice 7a which can be formed as
desired to provide a spray or a stream of the flowable substance.
Furthermore, the controllable outlet orifice 7a can be a cross-slit
as shown in FIG. 3. Alternatively, by selectively dimensioning the
controllable outlet orifice 7a, a drop-like amount of the flowable
substance can be dispensed, for example if an eye care solution or
other solution typically delivered in droplet form, is being
dispensed. If a greater amount of the flowable substance is to be
dispensed, the controllable outlet orifice 7a can be formed for
dispensing a larger quantity of the flowable substance, for example
by having a larger diameter opening.
[0046] Referring now especially to FIGS. 4B-C, a valve assembly
having a rounded soft cover 7 is provided. The soft cover 7 has a
rounded top useful for dispensing flowable substance into the outer
surfaces of the eye and surrounding tissue or other sensitive body
areas. Because the rounded tip lacks sharp edges, damage to the eye
or other sensitive tissues is avoided or reduced if incidental
contact occurs during administration of the flowable substance. The
soft cover 7 has a controllable outlet orifice 7a which can be
formed as desired to provide a spray or a stream of the flowable
substance. Furthermore, the controllable outlet orifice 7a can be a
cross-slit as shown in FIG. 3. Alternatively, by selectively
dimensioning the controllable outlet orifice 7a, a drop-like amount
of the flowable substance can be dispensed, for example if an eye
care solution or other solution typically delivered in droplet
form, is being dispensed. If a greater amount of the flowable
substance is to be dispensed, the controllable outlet orifice 7a
can be formed for dispensing a larger quantity of the flowable
substance, for example by having a larger diameter opening.
[0047] Referring now especially to FIG. 4D, a valve assembly having
a flat cover 7 which has an enlarged version of controllable outlet
orifice 7a is provided. The enlarged version of controllable outlet
orifice 7a is able to accommodate the inner core 10 and flexible
membrane 13 and is suitable for dispensing viscous flowable
substances such as lotions, creams and emollients, but may also be
used for any flowable substance. The enlarged version of
controllable outlet orifice 7a allows flowable substance to be
dispensed without having to move through two openings--namely the
opening at the end of the flexible elastomer 13 and the
controllable outlet orifice 7a, since these are now flush.
[0048] Referring now to FIG. 5 the gap formed between inner core 10
and the flexible membrane 13 by the pressurized fluid flowing out
of ports 12 can more easily be seen. The controllable outlet
orifice 7a in soft cover 7 can also be seen and may for example be
a substantially uniform circular bore thought the material of soft
cover 7 or may be suitably dimensioned as described in the
preceding paragraphs.
[0049] Referring now to FIGS. 6A-B, in another embodiment, flowable
substance flows through a single port 12 in inner core 10 and
expands the flexible membrane 13, swirling around the exterior of
inner core 10, and exiting via an outlet port 12a as shown in FIGS.
6A and 6B. This results in the need for less cracking pressure to
dispense flowable substance and is particularly advantageous for
use with, though not limited to, flowable substances having higher
viscosities such as lotions, creams and emollients. It should be
noted that additional ports 12 may be located through the inner
core 10.
[0050] In exemplary operation, when the flowable substance is to be
dispensed, the over cap 15 is removed and pressure is applied to
the actuator 2a of the reservoir 2 so that an amount of the
flowable substance passes out of the reservoir into the passageway
11 in the inner core 10. The substance flows through the ports 12
and expands the flexible membrane 13 radially outwardly and flows
toward the outlet end of the flexible membrane where it exits from
the flexible membrane radially inwardly into the controllable
outlet orifice 7a in the cover and is dispensed.
[0051] When the flowable substance is being dispensed and exits the
outlet end of the flexible membrane, it flows radially inward to
the controllable outlet orifice 7a which then opens allowing the
substance to flow out of the valve assembly. When the flowable
substance is dispensed and pressure on the source is withdrawn the
controllable outlet orifice 7a closes blocking any backflow into
the valve assembly. An over cap 15 is placed over the valve
assembly 3 when it is not in use, protecting it from contact with
ambient contaminants.
[0052] In another embodiment, as depicted in FIGS. 6A and 6B for
example, flowable substance flows through a single port 12 in inner
core 10 and expands the flexible membrane 13, swirling around the
exterior of inner core 10, and exiting via an outlet port 12a as
shown in FIGS. 6A and 6B. This results in the need for less
cracking pressure to dispense flowable substance and is
particularly advantageous for use with, though not limited to,
flowable substances having higher viscosities such as creams and
emollients.
[0053] By releasing the pressure on the actuator 2a of the
reservoir, the dispensing operation is terminated and the flexible
membrane 13 returns inwardly into contact with the outer surface of
the inner core 10. The inward movement of the flexible membrane
starts at its outlet end because of its increased thickness and
affords gradual contact with the outer surface of the inner core,
returning any flowable substance through the ports back into the
reservoir whereby contaminants cannot enter the reservoir.
Dispensing individual portions of the flowable substance can be
continued until the reservoir is almost completely emptied. As a
result of the structure and operation of the valve assembly, the
valve assembly according to an exemplary embodiment of the present
invention provides uniform pressure on the valve components via the
pressurization of the flowable substance.
[0054] In still another exemplary embodiment, for example a spray
pump such as that depicted in FIG. 2B, an actuator 17 serves to
transfer force to the pump assembly 16 when it is depressed. This
in turn compress the reservoir 2, thus providing the force
necessary to open the valve assembly and in certain embodiments
described above, controllable outlet port 7a, to dispense flowable
substance.
[0055] Elastomers suitable to form the soft cover 7, the flexible
membrane 13 and the valve cover 14 in exemplary embodiments of the
present invention include thermoplastic elastomers such as Dynaflex
manufactured by GLS Corp., C-Flex manufactured by CPT Inc., or
Santoprene manufactured by Advanced Elastomer Systems, Inc. The
elastomers, and the materials comprising any of the other
components of the device may have integrated, impregnated,
otherwise placed within them anti-microbial ingredients such as
silver ions contained within a ceramic carrier, such as those
supplied by AgION, or sustained-release ionic silver compounds,
such as those supplied by Westlake Plastic Technologies which are
known to be used in the making of anti-microbial plastics.
Furthermore, other anti-microbial suitable for compounding with or
coating plastics may be used. Furthermore, the soft cover 7 or the
flexible membrane 13 or both could, for example, be positively
charged to repel residual flowable substance, coated in for
example, Teflon type-plastics, have increased surface tension or be
anti-wetting, or any combination of the above so as to repel
flowable substance.
[0056] In yet other embodiments, including those described above,
the durometer of the elastomers can be varied in relation to the
viscosity of the flowable substance. For example, assemblies
containing substances with comparatively higher viscosities would
utilize softer, i.e. lower durometer elastomers, in order to reduce
the cracking force needed to dispense flowable substance, whereas
lower viscosity flowable substances would utilized harder, i.e.
higher durometer elastomers to maintain a strong seal. Likewise,
flowable substances containing lubricants would also utilize
harder, i.e. higher durometer elastomers to maintain a strong
seal.
[0057] As described above, the parts of the dispensing and delivery
device, including the valve assembly may be manufactured to close
tolerances such that they form airtight seals and are close fitting
ensuring optimal seals and operation of the device.
[0058] A variety of pharmaceuticals, cosmetics, food stuffs and
other flowable materials can be dispensed where it is important to
maintain them free of contaminants from the ambient atmosphere. The
flowable characteristics of the material being dispensed determines
or at least may affect the type and dimension of the valve
assembly.
[0059] According to exemplary embodiments of the present invention,
the material forming the controllable outlet orifice 7a does not
absorb the flowable substance. As a result, any substance entering
the outlet orifice 7 is ejected from the dispenser and does not
return into the space between the inner core and the flexible
membrane, thereby maintaining the purity or sterility of the
product remaining in the reservoir.
[0060] It should be understood that the various embodiments of the
valve assembly described above can each be used in the various
embodiments of the continuously sealing one way valve assembly
device.
[0061] As mentioned, the flowable substance may be a pharmaceutical
cosmeceutical, or nutraceautical, an eye care solution, other
opthalmological product, otorhinolarygology product, dermatological
product, gynecological product, or product for treating or
preventing anorectal, dermatological or pulmonary disorders or any
formulation administered to the body through the mucus membranes; a
food stuff, such as dairy products, beverages or juices; a
cosmetic, such as a skin care solution or toiletries; and liquid
vitamins, all of which are intended to be maintained free of
contaminants from the ambient atmosphere and of preservatives
during storage within the reservoir 2.
[0062] According to exemplary embodiments of the present invention,
many existing commercial products that contain preservatives can be
reformulated into preservative free versions and provided for
multiple dose dispensing with the valve assembly and delivery
system of the present invention. For example, conventional creams,
emollients, eye drops, nasal sprays, cosmetic creams that currently
require preservatives, notably parabens and benzalkonium chloride
that have proved to be deleterious to tissue, may be reformulated
in a preservative free form and are amenable to storage and
dispensing from reservoirs using the continuously sealing one way
valve assembly and delivery system of the present invention. This
can be accomplished by, for example, formulating the product
according to its original formulation, but without the
preservative, or by readjusting the formulation of the product, for
example by changing the excipients or the amount of the excipients
or both. Thus, these preservative free products are amenable to
storage and dispensing from reservoirs using the continuously
sealing one way valve assembly and delivery system of the present
invention because they are preservative free formulations.
[0063] The following examples provide embodiments describing
categories of medical products which are amenable to storage and
dispensing from reservoirs using the continuously sealing one way
valve assembly and delivery system of the present invention.
Preservative-free storage and delivery of formulations also can be
accomplished by providing, for example, multi-dose metered, high
barrier and for preservative-free systems as described in U.S. Pat.
No. RE 34,243, incorporated by reference above and U.S. Pat. Nos.
5,092,855; 5,305,783; 5,279,447; 5,305,786; and 5,353,961 all of
which are hereby incorporated by reference in their entirety.
EXAMPLES
Example 1
[0064] In an exemplary embodiment, preservative free
opthalmological products are amenable to storage and dispensing
from reservoirs using the continuously sealing one way valve
assembly and delivery system of the present invention. For example,
eye drops, and preferably those eye drops involved in chronic care,
for example, dry eye, glaucoma, allergies and NSAIDs, and also
those eye drops intended for acute care, for example during ocular
surgery, are amenable to storage and dispensing from reservoirs
using the continuously sealing one way valve assembly and delivery
system of the present invention. As a further example, those eye
drops used to relieve eye fatigue, those eye drops used to relieve
dry eye, those eye drops used relieve dry eye due to computer use,
television use, or fatigue due to prolonged awake periods are
amenable to storage and dispensing from reservoirs using the
continuously sealing one way valve assembly and delivery system of
the present invention.
[0065] Examples of dry eye products can include dry eye products
comprising methycellulose, hyaluronic acid, polyethelene glycol 400
0.4%, propylene glycol 0.3%, glycerin, and mineral oils. Examples
of glaucoma products include glaucoma products comprising timolol
0.25%/0.50%, brimonidine tartrate 0.1%, bimatoprost 0.03% and
travaprost 0.004%. Examples of allergy products include allergy
products comprising olopatadine HCL 0.1% and predisalone acetate
1%. Examples of NSAID products include NSAID products comprising
ketorolac 0.5% and diclofenac 0.1%.
Example 2
[0066] In an exemplary embodiment, preservative-free
otorhinolarygological products are amenable to storage and
dispensing from reservoirs using the continuously sealing one way
valve assembly and delivery system of the present invention. For
example, nasalia medicines, and preferably nasal sprays, external
ear creams, ear drops, steroid ear drops, antibiotic ear drops,
nose drops, and nose drops comprising phenylephrine 0.25% and
pseudoephedrine 30 mg, are amenable to storage and dispensing from
reservoirs using the continuously sealing one way valve assembly
and delivery system of the present invention.
Example 3
[0067] In an exemplary embodiment, preservative free dermatological
products are amenable to storage and dispensing from reservoirs
using the continuously sealing one way valve assembly and delivery
system of the present invention. For example, preservative free
skin preparations; scalp preparations; corticosteroid creams,
lotions and ointments; topical antibiotics and topical anti-fungal
agents are amenable to storage and dispensing from reservoirs using
the continuously sealing one way valve assembly and delivery system
of the present invention. Thus, these preservative free
dermatological products are amenable to storage and dispensing from
reservoirs using the continuously sealing one way valve assembly
and delivery system of the present invention because they are
preservative free formulations.
Example 4
[0068] In an exemplary embodiment, preservative free products for
the treatment or prevention of dermatologic disorders are amenable
to storage and dispensing from reservoirs using the continuously
sealing one way valve assembly and delivery system of the present
invention. For example, preservative free skin preparations; scalp
preparations; corticosteroid creams, lotions and ointments; topical
antibiotics; topical anti-fungal agents; therapeutic skin creams
including anti-bacterial, anti-fungal/parasitic, allergic and
non-specific dermatitis creams and emollients and all cosmetic
dermatologic compounds used for dermatologic disorders are
amendable to storage and dispensing from reservoirs using the
continuously sealing one way valve assembly and delivery system of
the present invention.
Example 5
[0069] In an exemplary embodiment, products for the treatment or
prevention of anorectal disorders are amenable to storage and
dispensing from reservoirs using the continuously sealing one way
valve assembly and delivery system of the present invention. For
example, preservative free creams, topical anaesthetics,
lubricating jellies and jelly or other preparations for hemorrhoid
treatment, prevention or management, are amenable to storage and
dispensing from reservoirs using the continuously sealing one way
valve assembly and delivery system of the present invention.
Example 6
[0070] In an exemplary embodiment, preservative free products for
the treatment or prevention of pulmonary disorders are amenable to
storage and dispensing from reservoirs using the continuously
sealing one way valve assembly and delivery system of the present
invention. For example preservative free formulations of products
for chronic obstruction disorder, for example, aerosol nebulizers
using B-adrenergic, anticholinergic, corticosteroid and theophyline
derivatives requiring multi-dose application are amenable to
storage and dispensing from reservoirs using the continuously
sealing one way valve assembly and delivery system of the present
invention.
Example 7
[0071] In an exemplary embodiment, preservative free gynecological
products are amenable to storage and dispensing from reservoirs
using the continuously sealing one way valve assembly and delivery
system of the present invention. For example, vulvovaginal
treatment medicines, such as medicines for contact irritant or
allergic vulvitis, chemical irritation, bacterial vaginosis,
Candidal vaginitis therapy including all azoles and nystatins,
butoconazole, butoconalzole 2%, clotrimazole, clotrimazole 1%,
metronidazole and trichomonas treatments are amenable to storage
and dispensing from reservoirs using the continuously sealing one
way valve assembly and delivery system of the present
invention.
Example 8
[0072] In an exemplary embodiment, preservative free lens care
products are amenable to storage and dispensing from reservoirs
using the continuously sealing one way valve assembly described
herein. For example, contact lens rinsing, cleaning disinfecting
and storage solutions, or a multi-purpose solution encompassing
contact lens rinsing, cleaning disinfecting and storage are
amenable to storage and dispensing from reservoirs using the
continuously sealing one way valve assembly and delivery system of
the present invention.
Example 9
[0073] In an exemplary embodiment, preservative free eye wash
products (e.g. irrigation solutions) are amenable to storage and
dispensing from reservoirs using the continuously sealing one way
valve assembly described herein. For example, eye wash products
used to clear the eye of environmental contamination are amenable
to storage and dispensing from reservoirs using the continuously
sealing one way valve assembly described herein. As a further
example, eye wash products used to clear the eye of environmental
contamination such as pollen or dirt are amenable to storage and
dispensing from reservoirs using the continuously sealing one way
valve assembly and delivery system of the present invention.
[0074] Although the system is designed for use with various
preservative free formulations it may also be used with
formulations which are not preservative free.
* * * * *