Container and valve assembly for storing and dispensing substances, and related method

Abstract

A container including a nozzle and body depending therefrom. The body is preferably tubular and defines an interior which retains a product to be dispensed. A cap engages the nozzle to prevent inadvertent release of the product. In order to dispense the product, the cap is removed and pressure is applied to the body and the nozzle allows release of the product. The nozzle releases the product without exposing the remaining product to the external atmosphere, thus the sterility of the interior of the body is maintained and the shelf life of the product is increased. The nozzle includes an inner body, coupled to the tubular body, surrounded by a flexible outer cover. A seam between the inner body and flexible outer cover forms a one-way release valve wherein a portion of the seam remains closed during dispensing the product.

Description

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The subject invention relates to containers for dispensing liquid, creamy, pasty or like products, and more particularly, to improved containers including one-way valves and collapsible and/or squeeze tubes that maintain the product in an airless and/or sterile condition during repeated dispensing, and to related methods of making and using such containers and valve assemblies.

[0004] 2. Background of the Related Art

[0005] Flexible tubes are used to store a variety of powder, liquid, gel, creamy and pasty products having a broad range of viscosities. Generally, the flexible tubes have a cover which is removed to expose a simple release aperture. As a result, low pressure is required to express the contents therein. Undesirable oozing and collection of product that can clog the release aperture is common. Moreover, when the traditional tube is opened, the contents are not only subject to the environment but a quantity of air is normally sucked into the tube. Hence, despite techniques for sterilizing foodstuffs and other products, even the use of preservatives cannot prevent degradation of many products, thereby limiting the shelf-life and range of products suitable for dispensing via tubes. For tubes which dispense multiple doses, even refrigeration after opening cannot prevent the subsequent degradation of the product. The perishable item still has a limited shelf life. In view of the above, one solution has been to provide sterile servings in smaller, portable quantities, such as individual serving packets of ketchup, mustard and mayonnaise.

[0006] Similarly, many cosmetic, dermatological, pharmaceutical and/or cosmeceutical products and other substances are packaged in dispensers or other containers that expose the product to air after opening and/or initially dispensing the product. As a result, such products must include preservatives in order to prevent the product remaining in the container from spoiling or otherwise degrading between usages. In addition, such products typically must be used within a relatively short period of time after opening in order to prevent the product from spoiling or otherwise degrading before use. One of the drawbacks associated with preservatives is that they can cause an allergic or an otherwise undesirable reaction or effect on the user. In addition, the preservatives do not prevent the bulk product stored within the open container from collecting, and in some cases, facilitating the growth of germs. Many such prior art dispensers expose the bulk product contained within the dispenser after opening to air, and thus expose the bulk product to bacteria, germs and/or other impurities during and/or after application of the product, thereby allowing contamination of the product remaining in the dispenser and spreading of the bacteria, germs or impurities with subsequent use of the product. For example, liquid lipstick is particularly poorly suited for dispensing by prior art containers. The liquid lipstick becomes contaminated, evaporates due to air passage losing moisture, and ultimately is unusable if not unsafe before complete utilization of the product. The tips become contaminated, dirty and sticky or crusty as well as allowing the lipstick to continue to flow when not being used.

[0007] In view of the above, several containers have been provided with closure devices such as one-way valves. One drawback associated with prior art dispensers including one-way valves is that the valves are frequently designed to work with mechanical pumps or like actuators that are capable of creating relatively high valve opening pressures. Exemplary dispensers of this type are illustrated in U.S. Pat. Nos. RE 37,047, 6,032,101, 5,944,702, and 5,746,728 and U.S. Publication Nos. US2002/0074362 A1, US2002/0017294 A1. Squeeze tube-type dispensers, on the other hand, are not capable of creating the necessary valve opening pressures, and therefore such prior art valves do not work effectively with squeeze tubes.

[0008] Accordingly, it is an object of the present invention to overcome one or more of the above-described drawbacks and disadvantages of the prior art.

SUMMARY OF THE INVENTION

[0009] A currently preferred embodiment of the container or dispenser of the present invention comprises a tube for storing a product. The tube is coupled in fluid communication with a nozzle for dispensing the product from the container. The nozzle acts as a one-way valve for allowing the passage of the product therethrough and preventing the passage of fluids in the opposite direction. The one-way valve is preferably formed by an inner body portion and a flexible cover overlying the inner body portion and creating the one-way valve at the interface of the inner body portion and flexible cover.

[0010] In accordance with another aspect of the present invention, a tube and valve assembly for storing and dispensing a substance therefrom includes a tube having a squeezable tubular body defining therein a storage chamber for receiving and storing the substance, and a head located at one end of the tubular body. The head defines a neck and a first axially extending passageway formed therethrough that is coupled in fluid communication with the storage chamber of the tubular body and defines an unobstructed axially extending flow path therebetween. A one-way valve assembly is mounted on the head and includes a valve body having a body base defining a second axially extending passageway coupled in fluid communication with the first axially extending passageway and defining an unobstructed axially extending flow path therebetween. The one-way valve assembly further includes an axially extending valve seat defining a diameter less than a diameter of the body base, a first substantially frusto-conical or tapered portion extending between the body base and the valve seat, and a plurality of flow apertures axially extending through the first portion adjacent to the valve seat and angularly spaced relative to each other. A valve cover is formed of an elastic material defining a predetermined modulus of elasticity, and includes a cover base mounted on the body base and fixedly secured against axial movement relative thereto. The cover base defines a diameter less than a diameter of the body base to thereby form an interference fit therebetween. A valve portion overlies the valve seat and defines a predetermined radial thickness and a diameter less than a diameter of the valve seat to thereby form an interference fit therebetween. The valve portion and valve seat define a normally closed, annular, axially extending valve opening therebetween, and the valve portion is movable radially between a normally closed position with the valve portion engaging the valve seat, and an open position with a segment of the valve portion spaced radially away from the valve seat to allow the passage of substance at a predetermined valve opening pressure therebetween. A second substantially frusto-conical or tapered portion extends between the cover base and valve portion, overlies the first substantially frusto-conical or tapered portion of the body, and forms an interference fit therebetween. At least one of the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material, is selected to (i) define a predetermined valve opening pressure generated upon manually squeezing the tube that allows passage of the substance from the storage chamber through the valve opening, and

[0011] (2) hermetically seal the valve and prevent the ingress of bacteria through the valve and into the tube in the normally closed position.

[0012] One advantage of the present invention is that the nozzle substantially prevents the ingress of air, other gases or vapors, or bacteria therethrough or otherwise into the tube during dispensing. As a result, the containers may maintain the substances contained therein in a sterile and/or airless condition throughout substantial periods of storage, shelf life and/or use. Accordingly, the containers of the present invention are particularly well suited for dispensing multiple doses of sterile and/or non-preserved (or “preservative-free”) products or other substances requiring storage in an airless condition.

[0013] Another advantage of the present invention is that at least one of the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material, is selected to (i) define a predetermined valve opening pressure generated upon manually squeezing the tube that allows passage of the substance from the storage chamber through the valve opening, and (2) hermetically seal the valve and prevent the ingress of bacteria through the valve and into the tube in the normally closed position. Accordingly, in contrast to the prior art valves described above, the tube and valve assembly of the present invention enables a sufficiently low valve opening pressure to allow the substance to be dispensed through the valve by manually squeezing the tube, yet the valve also hermetically seals the tube and prevents the ingress of bacteria or other impurities into the tube.

[0014] Another advantage of the currently preferred embodiments of the present invention is that the seal formed by the nozzle substantially prevents any creep of the material during the storage or shelf-life. Another advantage of the one-way valve assembly is that after dispensing the product does not remain in the one-way valve which could cause improper sealing and potential contamination. In addition, the one-way valve employed in the preferred embodiments of the present invention further maintains the interior of the tube in a hermetically-sealed condition throughout the storage, shelf-life and/or use of the container.

[0015] Yet another advantage of the present invention is that because the product may be maintained in an airless condition in the tube, the containers may be used in virtually any orientation, and furthermore, may be used in low gravity environments. Still another advantage is the ability to optimize the valve opening pressure for flow, ease of use and a desired valve opening pressure for products of varying viscosities.

[0016] Additionally, the invention herein is scalable which is useful when storing larger quantities of product having an extended shelf life. Another advantage of the currently preferred embodiments of the present invention is the flow path is substantially linear which allows for a more consistent flow rate and velocity of the product. The linear flow path also helps to prevent pockets in which a viscous material could become trapped or even create a flow path for a source of contamination.

[0017] Other object and advantages of the preferred embodiments of the present invention will become readily apparent in view of the following detailed description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] So that those having ordinary skill in the art to which the disclosed invention appertains will more readily understand how to make and use the same, reference may be had to the drawings wherein:

[0019] FIG. 1 illustrates a perspective view of a container embodying the present invention for storing and releasing a substance from a sterile environment.

[0020] FIG. 2 illustrates a side view of the container of FIG. 1 with the cap removed.

[0021] FIG. 3 illustrates a partially broken away, perspective view of the container of FIG. 1.

[0022] FIG. 4 illustrates an enlarged, partially broken away perspective view of the nozzle of the container of FIG. 1.

[0023] FIG. 4B illustrates a cross-section of another nozzle with an o-ring seal for a container embodying the present invention for storing and releasing a substance from a sterile environment.

[0024] FIG. 5 illustrates a perspective view of another container embodying the present invention for storing and releasing a substance from a sterile environment.

[0025] FIG. 6 illustrates a partial, side view of the container of FIG. 5.

[0026] FIG. 7 illustrates a partially broken away, perspective view of the container of FIG. 5.

[0027] FIG. 8 illustrates an enlarged, partially broken away perspective view of the nozzle of the container of FIG. 5.

[0028] FIG. 8B illustrates an partial, cross-sectional view of another nozzle with a flexible shoulder for a container embodying the present invention for storing and releasing a substance from a sterile environment.

[0029] FIG. 9 illustrates a perspective view of still another container for storing and releasing a substance from a sterile environment and embodying the present invention.

[0030] FIG. 10 illustrates a partial, perspective view of the container of FIG. 9.

[0031] FIG. 11 illustrates a partial, side elevational view of the container of FIG. 9.

[0032] FIG. 12 illustrates an enlarged, partially broken away view of the nozzle of the container of FIG. 9.

[0033] FIG. 12A illustrates a cross-sectional, somewhat schematic view of a nozzle similar to the nozzle of the container of FIG. 9 where the nozzle is at rest.

[0034] FIG. 12B illustrates a cross-sectional, somewhat schematic view of a nozzle similar to the nozzle of the container of FIG. 9 where the nozzle is beginning to have pressure.

[0035] FIG. 12C illustrates a cross-sectional, somewhat schematic view of a nozzle similar to the nozzle of the container of FIG. 9 where the nozzle is releasing the substance.

[0036] FIG. 13 illustrates a partially broken away, perspective view of the nozzle of the container of FIG. 9.

[0037] FIG. 14 illustrates a partial, enlarged, partially broken away perspective view of the nozzle of the container of FIG. 9.

[0038] FIG. 15 illustrates another partial, enlarged, partially broken away perspective view of the nozzle of the container of FIG. 9.

[0039] FIG. 15A illustrates a partial, cross-sectional view of the tip of the nozzle of the container of FIG. 9.

[0040] FIG. 15B illustrates a schematic perspective view of a portion of a valve cover for the nozzle of the container of FIG. 9.

[0041] FIG. 15C illustrates another cross-sectional view of the nozzle of the container of FIG. 9.

[0042] FIG. 15D illustrates a line drawing of the nozzle of the container of FIG. 9.

[0043] FIG. 16 illustrates a cross-sectional view of another nozzle for a container for storing and releasing a substance from a sterile environment and embodying the present invention.

[0044] FIG. 17 illustrates a line drawing of the nozzle of FIG. 16.

[0045] FIG. 18 illustrates a cross-sectional view of still another nozzle for a container for storing and releasing a substance from a sterile environment and embodying the present invention.

[0046] FIG. 19 illustrates a cross-sectional view of another container for storing and releasing a substance from a sterile environment and embodying the present invention.

[0047] FIG. 20A illustrates a side elevational view of still another container for storing and releasing a substance from a sterile environment and embodying the present invention.

[0048] FIG. 20B illustrates a line drawing of the container of FIG. 20A.

[0049] FIG. 20C illustrates the cartridge of the container of FIG. 20A.

[0050] FIG. 20D illustrates the outer cover of the container of FIG. 20A.

[0051] FIG. 21A illustrates a line drawing front view of still another container for storing and releasing a substance from a sterile environment and embodying the present invention.

[0052] FIG. 21B illustrates a line drawing side view of the container of FIG. 21A.

[0053] FIG. 22A illustrates a line drawing front view of still another container for storing and releasing a substance from a sterile environment and embodying the present invention.

[0054] FIG. 22B illustrates a line drawing side view of the container of FIG. 22A.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0055] The advantages, and other features of the invention disclosed herein, will become more readily apparent to those having ordinary skill in the art from the following detailed description of certain preferred embodiments taken in conjunction with the drawings which set forth representative embodiments of the present invention and wherein like reference numerals identify similar structural elements.

[0056] Referring to FIGS. 1-4, the container, referred to generally by reference numeral 100, includes a nozzle 102 and body 104 depending from the nozzle 102. The body 104 defines an interior which retains a creamy, pasty, liquid or other product (not shown) to be dispensed. To make the container 100, the body 104 and nozzle 102 are sterilized, the body 104 is filled with the product, such as a perishable food, cosmetic, household, pharmaceutical, cosmeceutical, medicinal or other product or substance, and the nozzle 102 is attached to seal the contents of the body 104 from the atmosphere. Preferably, after the container 100 is closed, the contents are sterilized by an appropriate method such as gamma radiation and the like as would be appreciated by those of ordinary skill in the pertinent art. However, as may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, the container 100 and the product contained therein can be sterilized, if desired, in any of numerous different ways that are currently or later become known for performing this function. For example, the product can be terminally sterilized, the product can be sterilized prior to filling same into the container, or the product can be in-line sterilized during filling of the container.

[0057] A cap 106 threadably engages the nozzle 102 to prevent inadvertent release of the product. In order to dispense the product, the cap 106 is removed and pressure is applied to the body 104 by manually squeezing the body 104 and, in turn, to the nozzle 102 to allow release of the product. The nozzle 102 releases the product without exposing the remaining product to the external atmosphere; thus, the sterility and/or airless condition of the interior of the body 104 is maintained and the shelf life of the product is not decreased. Further, bacteria or other contaminants are prevented from passing through the valve and into the interior of the body 104, as described further below.

[0058] The body 104 is a tube with a closed end 108 defining a normally closed seal and an open end 110 for sealingly connecting to the nozzle 102. As shown in FIGS. 3 and 4, the open end 110 has a neck 111 which defines an outlet 113 therethrough for releasing the product. Threads 115 about the circumference of the neck 111 couple the body 104 to the nozzle 102. Preferably, the body 104 is pliable such that a high percentage of the product therein can be easily utilized. The body 104 may be all plastic, aluminum, a combination thereof, and/or a plurality of other suitable materials well known to those skilled in the art now and later discovered. In one embodiment of the present invention, the body 104 is made from a coextruded sheet containing various combinations of LDPE, LLDPE, HDPE, tie resins and foil. The body 104 can be customized for the application, for example, by color, shape, decoration, coatings and the like. Additionally, the container 100 can be sized to be portable or otherwise as may be desired. The body 104 preferably also provides a barrier to oxygen, moisture, flavor loss and the like.

[0059] The product contained within the container may be any of numerous different types of cosmetics, such as eye and lip treatments, including, for example, lip gloss, eye colors, eye glaze, eye shadow, lip color, moisturizers and make-up, such as cover-up, concealer, shine control, mattifying make-up, and line minimizing make-up, personal care items such as lotions, creams and ointments, oral care items such as toothpaste, mouth washes and/or fresheners, pharmaceutical products such as prescription and over-the-counter drugs, dermatological products, such as products for treating acne, rosacea, and pigmentation disorders, cosmeceutical products, such as moisturizers, sunscreens, anti-wrinkle creams, and baldness treatments, nutraceuticals, other over-the-counter products, household items such as adhesives, glues, paints and cleaners, industrial items such as lubricants, dyes and compounds, and food items such as icing, cheese, yogurt, milk, tomato paste, and baby food, and condiments, such as mustard, ketchup, mayonnaise, jelly and syrup. As may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, this list is intended to be exemplary and in no way limiting.

[0060] The cap 106 is preferably made of plastic. Preferably, the cap 106 prevents inadvertent release of the product from the container 100. Additional tamper-evident features can be included to comply with FDA guidelines as would be appreciated by those of ordinary skill in the pertinent art. The container 100 also may be packaged in a box for additional ease of handling and safety.

[0061] In order to best understand the operation of the container 100, the structure and operation of the nozzle 102 will now be described in detail. The nozzle 102 is for releasing the product upon application of manual pressure to the body 104 by squeezing the body in a conventional manner, such as squeezing the body on opposites sides relative to each other and, in turn, transmitting a substantially radially-directed force into the body. By squeezing the body, the pressure of the product or other substance contained within the body is increased until the pressure is greater than the valve opening pressure of the nozzle 102 to, in turn, dispense the product within the container through the nozzle. The nozzle 102 includes an outer body or valve cover 112 at a distal end or tip, and an inner body 114 having a distal end or tip defining a valve seat that is coupled to the outer body or valve cover 112. The inner body 114 further defines a proximal end coupled to the body 104. An intermediate portion of the inner body 114 defines circumferential threads 116 for engaging the cap threads 118. The proximal portion of the inner body 114 defines internal threads 120 for engaging the body threads 115.

[0062] The outer body or valve cover 112 receives an inner nozzle portion or tip 124 defining the valve seat of the inner body 114. As shown in FIG. 4, the interface of the outer body 112 and the inner nozzle portion 124 defines a seam 125 which is normally closed (i.e., the inner and outer nozzle portions are abutting one another as shown in the drawings), but can be opened by the flow of product of sufficient pressure (i.e., equal to or greater than the valve opening pressure) into the seam 125 to release the product through the nozzle 120. The outer body 112 is preferably molded from a relatively flexible plastic material in comparison to the inner body 114. Thus, the outer body 112 can be flexed relative to the inner nozzle portion 124 to open the seam 125 to release the product through the nozzle 120.

[0063] As shown in FIG. 4, the inner body 114 includes an annular flange 126 which fits within a corresponding recess in the outer body 112, for retaining the inner body 114 within the outer body 112 and securing the outer body or valve cover against axial movement. The inner body 114 is therefore pressed into the outer body 112 and coupled to the outer body by guiding the flange 126 into the corresponding recess. The annular flange 126 also substantially prevents undesirable flow of the product between the annular flange 126 and outer body 112. As will be recognized by those skilled in the art, the inner body 114 can be molded as an integral part of the body 104.

[0064] As shown in FIGS. 3 and 4, the inner body 114 includes a first substantially cylindrical wall 136 essentially defining a hollow shaft projecting in the axial direction of the container 100 and threadably engaging the distal end of the body 104. The proximal end and intermediate portion of the inner body 114 define a first channel 138 which is sized and configured to align with the outlet 113 of the neck 111. The distal portion of the inner body 114 defines a relatively narrower second channel 142 axially aligned with the first channel 138. A plurality of release apertures 140, in communication with the second channel 142, are defined in a sidewall of the distal portion of the inner body 114 for allowing exit of the product therethrough. In a preferred embodiment, the cross-sectional area of the release apertures 140 is at least about 60% of the total cross-sectional area of the sidewall; although various size release apertures 140, both larger and smaller, may be selected to achieve the desired performance as would be appreciated by those of ordinary skill in the art based upon review of the subject disclosure.

[0065] In the operation of the container 100, the container 100 is actuated to release the product through the nozzle 120 by depressing the body 104 by hand. As a result, pressure develops within the body 104, the first channel 138, the second channel 142 and the release apertures 140. The pressure facilitates the flow of product from the body 104 through the seam 125. As a result, the pressurized product flows through the release aperture 140, into the seam 125, and out through the tip of the nozzle 120 for release. As indicated above, the valve opening pressure is sufficiently low so that manually squeezing the body will create sufficient pressure to cause the pressurized product within the container to open the seam 125 and dispense therethrough.

[0066] Once the product is released and the pressure upon the body 104 is removed, the seam 125 returns to its normally closed position to substantially prevent any product that is exposed to air from flowing back into the container 100 and otherwise seal the container. The container 100 is then ready to be actuated again to release another amount of product. One advantage of this type of container 100 is that once a dose of product is released, the seam 125 of the nozzle 120 closes, and thus substantially prevents the product which has been exposed to air or foreign particles from passing back through the nozzle 120 and into the container 100, which can, in some instances, contaminate the remainder of the product in the container 100. This advantage is particularly important when storing multiple-dose quantities of sterile and/or preservative-free formulations of medicament, perishable food, cosmetics, and the like.

[0067] Referring now to the embodiment of FIG. 4B, an o-ring 119 is included to prevent the product from inadvertently being released between the body 104 and inner body 114. Preferably, the o-ring 119 is seated between the container body 104 and the inner body 114 for forming a hermetic seal therebetween. As can be seen, in this embodiment the nozzle 102 differs from the nozzle described above in that the inner body 114 of the valve assembly includes a first substantially frusto-conical or tapered portion 127 extending between the base of the body and the valve seat 124. Further, the plural flow apertures 140 (only one shown) extend through the tapered portion 127. As can be seen, each flow aperture 140 is formed contiguous to the axially-elongated valve seat 124. The valve cover 112 includes a cover base 129 mounted on the body base and fixedly secured against axial movement relative thereto by the annular flange 126 of the body base being received within the corresponding annular recess of the cover base. A valve portion 131 of the valve cover overlies the valve seat 124. As can be seen, the valve portion 131 defines a predetermined radial thickness and a diameter less than a diameter of the valve seat to thereby form an interference fit therebetween. The valve portion 131 and valve seat 124 define the normally closed, annular, axially extending valve opening 125 therebetween. The valve portion 131 is movable radially between the normally closed position with the valve portion engaging the valve seat, as shown in FIG. 4B, and an open position with a segment of the valve portion spaced radially away from the valve seat to allow the passage of substance at a predetermined valve opening pressure therebetween. The valve cover 112 further defines a second substantially frusto-conical shaped portion 133 extending between the cover base and valve portion 131 that overlies the first substantially frusto-conical shaped portion 127 of the body and forms an interference fit therebetween.

[0068] As indicated by the broken line arrow 135 in FIG. 4B, the dispensed product defines an unobstructed, axially extending flow path between the interior of the body 104 and the flow apertures 140. By forming the outlet apertures in the substantially frusto-conical or tapered portion 127 of the inner body, and by forming the radially inner side of each aperture either contiguous to, or substantially contiguous to the annular, axially-extending valve seat 124 as shown, the head loss encountered in dispensing the product from the interior of the container through the flow apertures 140 is substantially minimized, thus facilitating a relatively low valve opening pressure. As a result, the container and valve assembly enables the product to be easily and comfortably dispensed through the nozzle by manually squeezing the tube, yet the valve assembly maintains a hermetic seal that substantially prevents the ingress of bacteria or other unwanted impurities through the valve and into the interior of the container. As described further below, the valve portion 131 and the frusto-conical shaped portion 133 of the valve cover define a tapered cross-sectional profile such that the radial thickness of the cover in these sections progressively decreases in the direction from the interior to the exterior of the valve assembly. As described further below, one advantage of this configuration is that once the product enters the interior end of the seam or valve opening 124, the energy required to successively open the remaining axial segments of the tapered and valve portions 133 and 131 progressively decreases, thus causing substantially all substance that enters the valve opening to be dispensed through the valve opening, and thereby prevent the residual seepage of such substance. As also described further below, and in accordance with the currently preferred embodiments of the present invention, at substantially any time during the dispensing of product through the valve opening 125, a respective annular segment of the valve portion 131 engages the valve seat 124 to thereby prevent fluid communication between the exterior and the interior of the valve. As a result, the valve assembly preferably continuously maintains the interior of the container hermetically sealed, even during dispensing, thus permitting the container to hold multiple doses of products that must be maintained in a sterile and/or airless condition, such as “preservative-free” formulations. As described further below, the axial extent of the valve seat 124 (i.e., the sealing surface of the valve seat) is made sufficiently long to ensure that this objective can be achieved.

[0069] Turning to FIGS. 5-8, another embodiment of the container of the present invention is indicated generally by the reference numeral 200. The container 200 is substantially the same as the container 100 described above, and therefore like reference numerals preceded by the numeral “2” instead of the numeral “1”, are used to indicate like elements whenever possible. The primary difference of the container 200 in comparison to the container 100 is that the inner portion 202 is integral with the body 104 thereby eliminating the need for a neck and distinct inner portion.

[0070] To manufacture the container 200, plastic pellets are melted while passing through an extruder. The extruder may thereby produce a single layer or a multiple layer continuous sleeve. The sleeve is cut to a desired length to form the body 204. The headless body 204 is loaded onto a mandrel where the inner body 214 is injected, compression molded or welded thereto, as is known to those of ordinary skill in the pertinent art. At this time, silk screening or additional printing may be applied to the external surface of the body. The body 204 is then filled with the selected product and the outer body 212 is coupled to the inner body 214 to seal the container 200.

[0071] To fill the container 200, a filling machine may be provided in a sterile environment. A variety of filling machines are available and an exemplary one is the liquid filler available from Pack West of 4505 Little John St., Baldwin Park, Calif. 91706. The product may be injected into the body 204 before or after the nozzle 202 is in place. After sealing with the outer body 212, the cap 206 is then applied. Preferably, the cap 206 prevents inadvertent release of the product during handling.

[0072] In an alternate filling method, a sterile environment is not required even though the product needs to be maintained in a sterile environment. Filling may include injecting a sterilizing agent such as liquid hydrogen peroxide at a pressure above atmospheric into containers made of polyethylene terephthalate or other suitable material for sterilization thereof. To remove the sterilizing agent, a stream of hot sterile air can hasten evaporation thereof. Then, the sterile product can fill the container and displace the hot air until a portion of the sterile fluid can be suctioned away to insure the entire contents are sterile. At such time, the proper closure in the form of a sterilized nozzle can be applied. For further examples of acceptable filling methods and apparatus, the container may be filled in accordance with the teachings of U.S. Pat. No. 6,351,924, U.S. Pat. No. 6,372,276 and/or U.S. Pat. No. 6,355,216, each of which is incorporated herein by reference in its entirety.

[0073] In another embodiment, shown in FIG. 8B, a container has a flexible shoulder 290 sealing the interior of the tubular body 204 from the ambient atmosphere. As can be seen, the distal end of the body 204 is spaced radially outwardly relative to the base of the inner body 214 to define a normally-closed fill opening 291 therebetween. The flexible shoulder 290 defines an annular sealing member 293 that extends axially inwardly into the space formed between the base of the inner body 214 and tubular body 204. The flexible shoulder 290 is preferably formed of an elastomeric material that normally engages the adjacent base of the inner body 214 and forms a fluid-tight or hermetic seal therebetween. During filling, a filling member (not shown) is moved either adjacent to, or into the aperture 291, and the product is pumped therethrough, as indicated by the arrow “a”. As a result, either the filling member (not shown) or the flow of product in the direction of the arrow “a” causes the sealing member 293 to flex radially away from the inner body base 214 and open the flow aperture 291 to allow the product to flow therethrough and into the interior of the container. After filling, the sealing member 293 returns to the normally closed position to hermetically seal the flow opening 291 and thereby seal the product within the container. As can be seen, because the distal or inner end of the sealing member 293 is directed radially inwardly relative to its base, the sealing member will not open in response to the pressure created upon dispensing the product through the nozzle, but rather will maintain the hermetic seal throughout the shelf life and usage of the container. As indicated in broken lines in FIG. 8B, a cap or other closure 295 may be secured to the shoulder 290 after filling to prevent any unwanted substances from being inadvertently or otherwise introduced through the flow opening 291 and into the interior of the container. The closure 295 may take any of numerous different configurations that are currently or later become known for performing this function, and the closure is preferably tamper proof such that if anyone does tamper with the sealed closure the tampering will be evident and the container may be discarded. As may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, there are a variety of useful apparatus and methods for filling that are currently and may later become known to those of ordinary skill in the pertinent art, and such apparatus and methods equally may be used to fill the different containers of the present invention.

[0074] Turning to FIGS. 9-12, another embodiment of the container of the present invention is indicated generally by the reference numeral 300. The container 300 is similar to the containers 100 and 200 described above, and therefore like reference numerals preceded by the numeral “3” instead of the numerals “1” and “2”, are used to indicate like elements whenever possible. The primary difference of the container 300 in comparison to the containers 100, 200 is that the nozzle 302 is a different configuration.

[0075] As with the nozzles described above, the nozzle 302 may be composed of any suitably durable, moldable, somewhat flexible material, such as a plastic material, and preferably is composed of a material which has been found to be compatible with the particular product contained therein, such as those materials sold under the trademarks VELEX® and LEXAN®, both owned by the General Electric Company of Fairfield, Conn., or under the trademark KRATON® owned by Kraton Polymers U.S. LLC. The inner body 314 of the nozzle 302 is preferably molded of one piece and comprises a truncated, conical-shaped or frusto-conical shaped body portion 313 (FIG. 12) terminating in a post or valve seat 317 on one end and a shoulder or cylindrical wall 336 on the other end. Preferably, the body portion 313 is oriented at an angle of about 45 degrees or less with respect to the axis of the container 300 to minimize the head loss of the product when dispensed. In a preferred embodiment, the angle of the body portion 313 is about 30 degrees. The shoulder 336 defines an axial flow path 348 which is greater in diameter than the post 317. In another embodiment (not shown), the diameter of the post 317 is larger than that of the axial flow path 348 to increase the size of the flow opening and correspondingly reduce the required valve opening pressure. As may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, the diameter (or radial or lateral dimension) of the valve seat of the nozzle disclosed herein can be adjusted, along with one or more of the degree of interference between the valve cover and the valve seat, the radial thickness of the valve portion of the valve cover, and the modulus of elasticity of the valve cover material, to achieve a desired valve opening pressure. As further described herein, one or more of these variables also can be selected to ensure that the valve assembly hermetically seals the interior of the container and prevents the ingress or bacteria or other unwanted substances through the valve and into the tube.

[0076] Referring to FIGS. 12A-C, preferably, and as indicated above, the axial extent of the valve seat or post 317 (i.e., the sealing surface between the valve seat and valve cover) is sufficiently long so that at any time during dispensing, a respective portion of the valve cover engages the valve seat to thereby prevent fluid communication between the product retained within the container and the ambient atmosphere. The post 317 has three regions labeled 1, 2 and 3. The first region 1 is the area in which the valve cover 312 blocks the flow aperture 340. The third region 3 is the area from which the substance exits the container 300. The second region 2 is the area intermediate the first region 1 and the third region 3. Each region 1, 2, 3 has an associated pressure P1, P2 and P3, respectively. At rest, each pressure P1, P2, P3 is equal to zero. As the container 300 is squeezed, and as shown in FIG. 12B, pressure builds in the first region 1 until a portion of the valve cover 312 unseats from the post 317. The substance flows into the second region 2 creating rising pressure in the second region 2 and third region 3 where P1>P2>P3. As shown in FIG. 12C, the substance travels into the third region 3 but prior to exiting the container 300, the valve cover 312 reseats on the post 317 in the first region 1 to retain the hermetic seal and prevent any opportunity for contamination to enter the container 300. As the substance is released, the relative pressure relationship is as follows P1<P2>P3>0.

[0077] As with the other embodiments of the valve assembly disclosed herein, the valve cover 312 preferably defines a cross-sectional (or radial) thickness that is progressively reduced moving axially in the direction from the interior to the exterior of the valve assembly. Thus, as shown typically in FIGS. 12A-12C, the valve cover defines a tapered cross-sectional profile that tapers inwardly when moving axially in the direction from the interior toward the exterior of the valve. In addition, as described further below, the interface between the valve cover and valve seat may define a decreasing level of radial interference when moving axially in the direction from the interior toward the exterior of the valve assembly, i.e., the valve cover may define a greater degree of radial interference with the valve seat in region 1 than in region 2, and may define a greater degree of radial interference in region 2 than in region 3 at the tip of the nozzle. Accordingly, the energy required to open the respective segments of the valve cover progressively decreases when moving axially in the direction from the interior toward the exterior of the valve. As a result, once the base region 1 of the valve is opened and the substance enters the normally closed seam or valve opening, the resilient nature of the valve cover, and construction of the valve assembly as described above, causes the valve cover to progressively return itself to the normally closed position and, in turn, force the dosage of substance axially through the seam. Further, the valve cover forces the substance within the seam out through the tip of the nozzle, and thus prevents substance from collecting within the valve and creating residual seepage at a later point in time.

[0078] As shown best in FIG. 12, a flange 326 is disposed coaxially with the conical-shaped portion 313 and extends radially therefrom. In a preferred embodiment, the conical-shaped portion 313 is frusto-conical-shaped. The flange 326 helps retain the outer body 312 and creates a constrained surface overlying the flow aperture 340 to, in turn, reduce and otherwise prevent the residual seepage of material. An annular recess 319 is formed between the conical-shaped portion 313 and the flange 326. It will be recognized that the conical-shaped portion 313 and flange 326 may be molded together or separately. Similarly, the inner body 314 and tube 304 may be integral or distinct components. The conical-shaped portion 313 comprises a central bore 342 in communication with the interior of the tube 304 by axial flow path 348. The central bore 342 terminates in a plurality of release apertures 340 through which the product may flow axially. Container 300 includes three release apertures 340 approximately equally spaced relative to each other about the axis of the nozzle 302 such that, in cross-section, the area defined by the release apertures 340 is greater than the remaining solid portions. However, as may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, the nozzle 302 may include any desired number of such release apertures in any desired configuration depending upon the application of the dispenser or otherwise as required. In one preferred embodiment, the configuration of release apertures are at least about 50% of the annular area, and most preferably between about 70% and about 90%.

[0079] The outer body cover 312 may be composed of any durable, resilient and flexible material having the desired modulus of elasticity, such as an elastomeric material. Preferably, the outer body cover 312 is composed of a thermo-elastic material, such as a styrene-butadiene elastomer sold under the trademark KRATON®. Other suitable materials include without limitation polyvinylchloride, APEX FLEXALLOY® material available from Teknor Apex Company, SANTOPRENE® rubber available from Advanced Elastomer Systems and butyl rubber. In a preferred embodiment, the inner body 314 is fabricated from KRATON® material which has a modulus of elasticity of approximately 4.1 Mpa and the outer cover 312 is fabricated from SANTOPREN® material which has a modulus of elasticity of approximately 2.6 Mpa to approximately 4.1 Mpa. The outer body cover 312 comprises a mounting portion 321 and a tapered portion 323 which cooperate with the inner body 314 to provide a hermetic one-valve. The mounting portion 321 defines an annular recess that engages the conical-shaped portion 313 and the flange 326 to couple the outer body cover 312 thereto. Because of the resilient nature of the material of the outer body cover 312, the inner body 314 may be slightly oversized in order to provide a resilient interference fit. In one embodiment, the outer body cover 312 is molded to the same dimension as the inner body 314 and post-molding shrinkage of the outer body cover 312 results in the desired interference fit.

[0080] The outer body or valve cover 312, when mounted, is dimensioned and configured to resiliently engage the inner body 314 whereby the tapered portion 323 and post or valve seat 317 form a normally-closed, one-way valve therebetween. As described above and shown typically in FIG. 12, the cross-sectional thickness of the tapered portion 323 gradually decreases in the axial direction toward the distal end or tip of the nozzle. As a result, the pressure required to open the valve seat gradually decreases to facilitate the release of the product through the one-way valve, while simultaneously preventing air or other gases from passing through the one-way valve in the opposite direction. Preferably, a substantially annular segment of the outer body cover 312 engages the post 317 throughout any period of dispensing to maintain a hermetic seal between the interior and ambient atmosphere as shown in FIGS. 12A-C. If desired, and as also described above, the degree of interference between the tapered portion 323 of the valve cover and the valve seat 217 may progressively decrease in a direction from the interior to the exterior of the nozzle 302 by varying the inner diameter of the outer body cover 312 and/or the size of the inner body 314. Preferably, a cap (not shown) couples to the threads 316 of the inner body 314 to seal the nozzle 302 and prevent inadvertent discharge of the product.

[0081] Referring now to FIGS. 13-15, the nozzle 402 is similar to the nozzles described above, and therefore like reference numerals preceded by the numeral “4” instead of the numerals “1”, “2” and “3”, are used to indicate like elements whenever possible. One advantage of the configuration illustrated in embodiments 300 and 400 is that the product follows a substantially straight flow path extending in a direction parallel to the axis of the container 300, 400. This relatively straight and smooth flow path allows the product to flow through the nozzles 302, 402 with relatively little head loss, thus allowing lesser force to dispense the product and preventing spaces where the product may undesirably collect.

[0082] In addition, it maybe desirable to make the outer diameter of the valve seat 317 as large as possible to thereby decrease the requisite valve opening pressure that must be generated upon the squeeze tube 404 in order to open the valve and dispense product through the valve. The present inventor has recognized that a variety of factors can affect the valve opening pressure, including the diameter of the valve seat 417, the modulus of elasticity of the valve cover 412, the degree of interference between the valve cover 412 and valve seat 417, and the thickness and shape of the valve seat 417. All other factors being equal, the volumetric flow rate of material through the valve will be greater for increasing diameters of the valve seat 417 and the requisite valve opening pressure will decrease. The present inventor has recognized that it may be desirable to (1) increase the diameter of the valve seat 417 in comparison to prior art valves in order to decrease the requisite valve opening pressure that must be created upon squeezing the tube; (2) decrease the head loss of the product flowing through the valve in comparison to prior art valves; and (3) decrease the stored elastic energy in the valve upon dispensing the product through the valve in order to, in turn, decrease the residual seepage of product through the valve. A significant advantage of the valves illustrated in FIGS. 9-15 and in the additional embodiments described herein is that the flow openings 440 define flow paths substantially parallel to the axes of the containers to, in turn, minimize the head loss of products flowing through the valves.

[0083] As a result, it will be appreciated by one of ordinary skill in the art based upon review of the subject disclosure that at least one of the valve seat diameter, a degree of interference between the valve cover 312 and valve seat 317, the predetermined radial thickness of the valve portion 323 of the valve cover 317, and a predetermined modulus of elasticity of the valve cover 312 material, can be selected to (1) define a predetermined valve opening pressure generated upon manually squeezing the tube 304 that allows passage of the substance from the storage chamber through the valve opening 340, and (2) hermetically seal the valve 302 and prevent the ingress of bacteria or other unwanted substances or impurities through the valve 302 and into the tube 304 in the normally closed position.

[0084] In another embodiment shown in FIG. 15A, the valve seat 417 extends through the nozzle 402 into the interior of the tube. The valve body 414 defines a plurality of flow apertures 440 that extend angularly about the valve seat 424, and are angularly spaced relative to each other with corresponding solid portions formed therebetween. In a currently preferred embodiment of the present invention, the valve body defines three angularly extending flow apertures 440. As indicated above, the flow apertures 440 preferably extend through at least about 60% of the annulus on which they lie, and most preferably extend through between about 70% and about 90% of the annulus on which they lie. As also shown typically in FIG. 15A, the degree of interference between the valve cover 412 and valve seat 424 is illustrated visually by the overlap in the cross-hatched lines. As can be seen, there is a significant degree of interference between the valve cover and the valve seat in order to ensure the formation of the desired hermetic seal in the normally closed position. In the embodiment of FIG. 15A, the valve seat 424 defines a tapered distal portion, and the valve portion 423 of the valve cover defines a tapered cross-sectional profile as described above. As may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, the valve seat may take any of numerous different configurations, include a straight profile or consistent diameter from one end to the other, or a tapered or other varying configuration, in order to achieve certain performance criteria or other desired objectives.

[0085] Depending upon the viscosity of the product, the configuration of the nozzle 402 can be varied to achieve a desired valve opening pressure and to ensure the consistent formation of a hermetic seal in the normally closed position. For example, the outer cover 412 can have varying levels of interference and modulus of elasticity which contribute to the valve opening pressure, i.e. the stress required in the circumferential direction to open the valve. With reference to FIG. 15B, which illustrates schematically an axial segment of the valve cover 412, the formulas for determining the valve opening pressure are as follows: 1$\begin{array}{c}\Delta a=\frac{q}{E}-\frac{2a{b}^2}{a^2-b^2}\\ \Delta b=\frac{qb}{E}\frac{a^2+b^2}{a^2-b^2}+v\\ {\sigma }_2=\frac{q{b}^2\left(a^2+r^2\right)}{r^2\left(a^2-b^2\right)}\\ \max {\sigma }_2=\frac{q\left(a^2+b^2\right)}{\left(a^2-b^2\right)}\mathrm{when}r=b\end{array}$

[0086] solving for q yields 2$\begin{array}{c}q=\Delta bE\\ {\hspace{0.17em}}^b\frac{a^2+b^2}{a^2-b^2}+v\end{array}$

[0087] insert q in above yields 3$\max {\sigma }_2=\frac{\Delta bE\left(a^2+b^2\right)}{{\hspace{0.17em}}^b\frac{a^2+b^2}{a^2-b^2}+v\left(a^2-b^2\right)}$

[0088] wherein q=unit pressure (force per unit area); a=outer radius; b=inner radius; σ2=stress in circumferential direction; E=modulus of elasticity; ν=Poisson's ratio (approximately 0.4); Δa=change in radius a; and Δb=change in radius b. By applying these formulas to the five locations A, B, C, D, E of FIG. 15A, the different parameters can be calculated. Based upon these formulas, Table 1 provides exemplary data for the embodiment of FIG. 15A at five locations A-E illustrated in FIG. 15A.

TABLE 1
A (Groove Section)
	E =	4.137931034	Mpa
Poisson's Ratio	(v) =	0.4
Outer	Radius a =	1.62	mm
Inner	Radius b =	1.28	mm
	Delta a =	0.084596753	mm
	Delta b =	0.095	mm
Internal Pressure	q =	0.065020291	Mpa	9.43690728 psi
Stress	σ =	0.281103953	Mpa	40.798832 psi
B (Groove Section)
	E =	4.137931034	Mpa
Poisson's Ratio	(v) =	0.4
Outer	Radius a =	2.08	mm
Inner	Radius b =	1.39	mm
	Delta a =	0.184300368	mm
	Delta b =	0.23	mm
Internal Pressure	q =	0.227177379	Mpa	32.97204338 psi
Stress	σ =	0.593822673	Mpa	86.18616442 psi
C (Groove Section)
	E =	4.137931034	Mpa
Poisson's Ratio	(v) =	0.4
Outer	Radius a =	2.295	mm
Inner	Radius b =	1.4	mm
	Delta a =	0.165350559	mm
	Delta b =	0.22	mm
Internal Pressure	q =	0.251511379	Mpa	36.50382854 psi
Stress	σ =	0.549641754	Mpa	79.77383947 psi
D (Groove Section)
	E =	4.137931034	Mpa
Poisson's Ratio	(v) =	0.4
Outer	Radius a =	4.75	mm
Inner	Radius b =	2.3	mm
	Delta a =	0.197999223	mm
	Delta b =	0.315	mm
Internal Pressure	q =	0.281593521	Mpa	40.86988699 psi
Stress	σ =	0.454079233	Mpa	65.9040977 psi
E (Groove Section)
	E =	4.137931034	Mpa
Poisson's Ratio	(v) =	0.4
Outer	Radius a =	4.75	mm
Inner	Radius b =	4.25	mm
	Delta a =	0.237919859	mm
	Delta b =	0.25	mm
Internal Pressure	q =	0.025818142	Mpa	3.747190459 psi
Stress	σ =	0.233080451	Mpa	33.82880276 psi

[0089] In FIGS. 15C and 15D, the tube 404 defines a maximum diameter D1, the valve seat 424 defines a constant diameter D2, and the axial length of the valve seat (or the sealing surface of the valve seat) is defined as “L” and extends between point “A” at the tip of the nozzle, and point “B” adjacent to the radially inner edges of the flow apertures 440. The valve portion 423 defines an inner annular surface 427 that extends axially in engagement with the valve seat 424 and cooperates with the valve seat to define the length “L” of the sealing surface. The relaxed or unstretched diameter of the annular surface 427 of the valve portion is defined as D3. As described above, the inner diameter D3 of the annular surface 427 is less than the outer diameter D2 of the valve seat 424 in order to form an interference fit and thus a hermetic seal therebetween. In FIG. 15D, the line drawing shows the valve cover lines in both the stretched and unstretched states to illustrate visually the interference between the valve cover and inner body. In the illustrated embodiment, the degree of interference between the valve seat and valve cover is substantially constant along the length “L” of the sealing surface. However, as indicated above, the degree of interference may be varied, if desired. Exemplary values for the parameters for currently preferred embodiments of the present invention are illustrated in Table II below. The interference between the valve seat outer diameter D2 and the valve cover inner diameter D3 is labeled “I” and is determined based on the differences in the two diameters divided by two. The thickness of the valve cover at point A is labeled “T1 (A)” and the thickness of the valve cover at point B is labeled “T2(B)”.

TABLE II
D1	D2	D3	I	L	T1(A)	T2(B)
1	inch	7.6 mm	6.8 mm	0.4 mm	3.28	mm	0.71	mm	1.25	mm
0.5	inch	5.0 mm	4.6 mm	0.2 mm	3.9	mm	0.5	mm	0.8	mm

[0090] In one embodiment of the present invention, wherein the valve seat diameter D2 is 5 mm, the valve opening pressure corresponds to a force that is substantially radially directed onto a mid-portion of the tubular body within the range of about 2.4 kg and about 2.9 kg. In another embodiment of the present invention, wherein the valve seat diameter D2 is 10 mm, the valve opening pressure corresponds to a force of about 5.4 kg that is substantially radially directed onto a mid-portion of the tubular body. Preferably, the valve opening pressure corresponds to a substantially radially directed force applied to a mid-portion of the tubular body within the range of about 1 kg through about 6 kg, and more preferably within the range of about 2 kg through about 4 kg, and most preferably within the range of about 2.4 kg through about 2.9 kg. The length “L” of the valve seat (or sealing surface thereof), is preferably at least about 30% of the diameter D2 of the valve seat, and is preferably within the range of about 40% to about 85% of the diameter D2 of the valve seat. For smaller diameter tubes, the valve seat necessarily may define a smaller diameter D2, and therefore the ratio of the length “L” of the valve seat to the diameter D2 typically will be greater the smaller the tube. Thus, for approximately 1 inch diameter tubes as described above, the length “L” of the valve seat is preferably within the range of about 25% to about 75% of the valve seat diameter D2, and most preferably is within the range of about 35% to about 65% of the valve seat diameter D2. For approximately 0.5 inch diameter tubes as described above, on the other hand, the length “L” of the valve seat is preferably at least about 60% of the diameter D2, is more preferably at least about 75% of the diameter D2, and is most preferably greater than 75% of the diameter D2.

[0091] It is envisioned that the containers disclosed herein may receive liquids, suspensions, gels, creams, pasty products, fluids, and the like which typically are at risk for growing germs or in the past have required preservatives. For example, the container may store vacuum packed, UHT milk alleviating the need for refrigeration, baby formula, toothpaste, premeasured dosages of baby food in accordance with the principles disclosed in U.S. patent application Ser. No. 10/272,577 filed Oct. 16, 2003 (incorporated herein by reference in its entirety), as well as petrogels, beverages carbonated and otherwise, yogurt, honey, ketchup, mustard, mayonnaise and tartar sauce in single or multiple servings.

[0092] In FIGS. 16 and 17, another container embodying the present invention is indicated generally by the reference numeral 500. The container 500 is substantially the same as the containers described above in connection with FIGS. 1-14, and therefore like reference numerals preceded by the numeral “5” instead of the numerals “I” through “4”, are used to indicate like elements whenever possible. As can be seen, the container 500 includes a dispensing tip 511 shaped to conformably contact a user's lips by defining, for example, a substantially concave surface contour. It will be appreciated by those of ordinary skill in the pertinent art that a different contour for conformably and/or comfortably contacting a user's skin or lips may be utilized. The inner body 514 of the nozzle 502 is preferably molded of one piece and terminates in a post or valve seat 517 on one end and a shoulder 536 on the other end. The shoulder 536 has a projection 538 for sealingly engaging a projection 505 of the flexible tube 504 to, in turn, secure the nozzle 502 to the tube 504. Preferably, the inner body is fabricated from KRATON® material exhibiting a hardness of about 65 shore A, and the valve cover 512 is fabricated from KRATON® material exhibiting a hardness of about 20 shore A. However, as may be recognized by those of ordinary skill in the pertinent art, these hardnesses are only exemplary, and may be changed as desired to meet certain performance criteria or otherwise as desired.

[0093] In FIG. 18, another container embodying the present invention is indicated generally by the reference numeral 600. The container 600 is substantially the same as container 500, and therefore like reference numerals preceded by the numeral “6” instead of the numerals “1” through “5”, are used to indicate like elements. As can be seen, the container 600 includes a tip region 611 having a substantially frusto-conical surface contour for conformably contacting or substantially conformably contacting a user's facial or other skin area, or otherwise for effectively and comfortably applying a released product to a desired area. As may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, the shape of the nozzle tip may take any of numerous different shapes and/or configurations that are currently or later become known for performing the functions of the nozzle tip, including conformably or otherwise contact a particular surface area of interest.

[0094] In FIG. 19, another container embodying the present invention is indicated generally by the reference numeral 700. The nozzle 702 of container 700 is substantially the same as the nozzles above, and therefore like reference numerals preceded by the numeral “7” instead of the numerals “1” through “6”, are used to indicate like elements whenever possible. For simplicity, the following description is directed to the differences in the body 704 of the container 700. The body 704 has a resilient outer wall 760 and base 762 sealingly connected to the lowermost end of the outer wall 760. The outer wall 12 has a cross-section to accommodate a user's hand and is fabricated from a resilient plastic such as low density polyethylene so that the outer wall 112 can be heat sealed to the other components of the container 700. As would be appreciated by those of ordinary skill in the pertinent art molding, extruding and like methods of fabricating the components of container 700 are interchangeable and adhesives, heat sealing, interference fits, the like and combinations thereof may be used to assemble the container 700.

[0095] The base 762 is sealed to the lowermost end of the outer wall 760. Preferably, the base 762 is sized and configured such that the container 700 can be rested in an upstanding manner thereon. An air check valve 770 regulates the flow of air to and from the space 772 between the interior of the outer wall 760 and exterior of the inner bag 764. A vent hole 774 in the base 762 admits ambient air into the space 772 via the check valve 770 after a dispensing cycle to allow the outer wall 760 to return to an oval cross-sectional shape. As the container 700 is squeezed, the escape of air from the vent hole 774 needs to be sufficiently slow enough so that pressure builds within space 772 and dispensing occurs before an appreciable amount of air is lost. In contrast, upon relaxation of the squeezing, sufficient air needs to enter into space 772 via vent hole 774 to quickly return the outer wall 760 to the undeformed shape. A ring 776 surrounds the check valve 770 to prevent an inner bag 764 from interfering with the operation of the check valve 770.

[0096] The flexible inner bag 764 contains the product and is secured to the outer wall 760 at a top edge 766. In addition, the inner bag 764 is secured to the interior of the outer wall 760 at a point 768 approximately intermediate the ends of the outer wall 760 to insure substantially complete emptying of the inner bag 764 without extraordinary force being applied to the outer wall 760. Preferably, the inner bag 764 is fabricated from a low flexural modulus material to prevent significantly adding to the force required to dispense the product contained within the interior 765 thereof.

[0097] The nozzle 702 selectively and hermetically seals the interior of the inner bag 762 from the ambient air. By preventing air from entering into the interior 765 of the inner bag 764, the nozzle 702 not only retains the sterility of the interior 765 but aids in initiating the next dispensing cycle without appreciable belching or excessive squeezing of the outer wall 760. During the dispensing cycle, the outer wall 760 is squeezed and deforms to increase the pressure within the space 772 and thereby increase the pressure within the interior 765 of the inner bag 764. Although an amount of air escapes through vent hole 774, the pressure overcomes the engagement of the valve cover 712 and the product flows out of flow apertures 740 as described above. Upon removal of the squeezing force, dispensing of the product stops. The outer wall 769 begins to return to the undeformed shape which creates a vacuum within space 772. The vacuum forces the check valve 770 to open allowing ambient air to enter via vent hole 774 to, in turn, cause the inner bag to move toward the nozzle 702 and allow the outer wall 760 to return to shape. Accordingly, during subsequent squeezing of the outer wall 760, the nozzle 702 quickly opens again to allow the product to be released again in a hermetic manner. After multiple doses, the inner bag 764 flexes about the midpoint 768 until substantially all of the product is dispensed from the interior 765.

[0098] In another embodiment, the outer wall 760 is fabricated from a relatively rigid material to, in turn, increase the pressure required to deform the outer wall 760 and/or facilitate generating pressure. As a result, the nozzle 702 can be configured for an increased opening pressure. It will be appreciated by those of ordinary skill in the art upon review of the subject disclosure that the concepts of container 700 can be readily adapted to any of a number of configurations for containers such as, without limitation, a flexible tube as shown above and the check valve may be located at any of several suitable locations.

[0099] In FIGS. 20A-22B, three additional containers embodying the present invention are indicated generally by the reference numerals 800, 900 and 1000, respectively. The nozzles of these containers are substantially the same as the nozzles above, and therefore like reference numerals preceded by a different numeral instead of the numerals “1” through “7”, are used to indicate like elements whenever possible. For simplicity, the following description is directed to the differences in the containers. Turning to container 800 shown in FIGS. 20A-20D, the outer cover 860 is formed into a decorative shape and receives a cartridge 864. Preferably, the cartridge 864 selectively engages the outer cover 860 by a snap fit mechanism 867 and has the inner body 814 formed integrally therewith. A new valve cover 812 may be used each time a cartridge 864 is replaced or the same valve cover 812 may be reused. In another embodiment, the outer cover 860 is a semi-rigid or rigid material such as colored plastic or glass to further add to the aesthetics of the container 800. In another embodiment, the entire outer cover 812 is rigid and a pump is included to dispense the product as shown in U.S. patent application Ser. No. 10/001,745 filed Oct. 23, 2001 which is incorporated herein by reference in its entirety. A handle 803 allows easy carrying and use of the container 800.

[0100] By varying the configuration of the nozzle, the valve opening pressure can be optimized to release even highly viscous products such as honey, syrups, lubricating greases, petrogels, caulking compounds and other materials ranging from one centipoise to thousands of centipoise of viscosity while at the same time maintaining the integrity and sterility of the remaining product.

[0101] While the invention has been described with respect to preferred embodiments, those skilled in the art will readily appreciate that various changes and/or modifications can be made to the invention without departing from the spirit or scope of the invention as defined by the appended claims.

Claims

1. A tube and valve assembly for storing and dispensing a substance therefrom, comprising: a tube including a squeezable tubular body defining therein a storage chamber for receiving and storing the substance, and a head located at one end of the tubular body, wherein the head defines a neck and a first axially extending passageway formed therethrough that is coupled in fluid communication with the storage chamber of the tubular body and defines an unobstructed axially extending flow path therebetween; and a one-way valve assembly mounted on the head comprising: (a) a valve body including: a body base defining a second axially extending passageway coupled in fluid communication with the first axially extending passageway and defining an unobstructed axially extending flow path therebetween; an axially extending valve seat defining a diameter less than a diameter of the body base; a first substantially frusto-conical portion extending between the body base and the valve seat; and a plurality of flow apertures axially extending through the substantially frusto-conical portion adjacent to the valve seat and angularly spaced relative to each other; and (b) a valve cover formed of an elastic material defining a predetermined modulus of elasticity, and including: a cover base mounted on the body base and fixedly secured against axial movement relative thereto; a valve portion overlying the valve seat, wherein the valve portion defines a predetermined radial thickness and a diameter less than a diameter of the valve seat to thereby form an interference fit therebetween, the valve portion and valve seat define a normally closed, annular, axially extending valve opening therebetween, and the valve portion is movable radially between a normally closed position with the valve portion engaging the valve seat and an open position with a segment of the valve portion spaced radially away from the valve seat to allow the passage of substance at a predetermined valve opening pressure therebetween; and a second substantially frusto-conical shaped portion extending between the cover base and valve portion, overlying the first substantially frusto-conical shaped portion of the body, and forming an interference fit therebetween; and wherein at least one of the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material, is selected to (1) define a predetermined valve opening pressure generated upon manually squeezing the tube that allows passage of the substance from the storage chamber through the valve opening, and (2) hermetically seal the valve and prevent the ingress of bacteria through the valve and into the tube in the normally closed position.

2. A tube and valve assembly as defined in claim 1, wherein said predetermined valve opening pressure corresponds to a substantially radially directed force applied to the tubular body within the range of about 1 kg through about 6 kg.

3. A tube valve assembly as defined in claim 2, wherein said substantially radially directed force is within the range of about 2 kg through about 4 kg.

4. A tube and valve assembly as defined in claim 3, wherein said substantially radially directed force is within the range of about 2.4 kg through about 2.9 kg.

5. A tube and valve assembly as defined in claim 1, wherein a substantially annular segment of the valve portion engages the valve seat substantially throughout any period of dispensing substance through the valve opening to maintain a hermetic seal between the storage chamber and ambient atmosphere.

6. A tube and valve assembly as defined in claim 1, wherein the valve cover and valve body define an increasing degree of interference therebetween in a direction from the interior to the exterior of the valve assembly.

7. A tube and valve assembly as defined in claim 1, wherein the valve portion defines a decreasing radial thickness when moving axially in a direction from an inner end toward a distal end of the valve seat.

8. A tube and valve assembly as defined in claim 7, wherein the substantially frusto-conical and valve portions of the valve cover each define a decreasing radial thickness when moving axially in a direction from the substantially frusto-conical portion toward the valve portion.

9. A tube and valve assembly as defined in claim 1, wherein the valve body defines at least two angularly extending flow apertures angularly spaced relative to each other.

10. A tube and valve assembly as defined in claim 9, wherein the valve body defines a plurality of angularly extending flow apertures, and a plurality of solid portions formed between the angularly extending flow apertures, and wherein the flow apertures define a cross-sectional flow area greater than the corresponding cross-sectional area of the solid portions.

11. A tube and valve assembly as defined in claim 10, wherein the cross-sectional flow area is at least about 60% and the solid portions are less than about 40% of a total cross-sectional area of the flow area and solid portions combined.

12. A tube and valve assembly as defined in claim 1, wherein valve seat diameter is within the range of about 5 mm through about 10 mm.

13. A tube and valve assembly as defined in claim 1, wherein the modulus of elasticity of the valve cover material is within the range of about 0.2 Mpa through about 0.6 Mpa.

14. A tube and valve assembly as defined in claim 1, wherein the radial thickness of the valve portion is within the range of about 0.4 mm through about 0.8 mm.

15. A tube and valve assembly as defined in claim 1, wherein the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material, are each selected to (i) define a predetermined valve opening pressure generated upon manually squeezing the tube that allows passage of the substance from the storage chamber through the valve opening, and (2) hermetically seal the valve and prevent the ingress of bacteria through the valve and into the tube in the normally closed position.

16. A tube and valve assembly as defined in claim 1, wherein each flow aperture is substantially contiguous to the valve seat.

17. A tube and valve assembly as defined in claim 1, further comprising means for decreasing the valve opening pressure in the axial direction from an inner end of the valve seat toward a distal end thereof.

18. A tube and valve assembly as defined in claim 15, wherein said means is defined by a decreasing degree of interference between the valve portion and valve seat.

19. A tube and valve assembly as defined in claim 1, further defining an unobstructed, substantially axially extending flow path between the storage chamber and at least one flow aperture.

20. A tube and valve assembly as defined in claim 1, wherein the squeezable tubular body is formed integral with the head.

21. A tube and valve assembly as defined in claim 20, wherein the integral head forms the valve body.

22. A tube and valve assembly as defined in claim 1, wherein the neck defines a first threaded portion, and the valve body defines a second threaded portion for threadedly engaging the valve body to the neck.

23. A tube and valve assembly as defined in claim 22, further comprising a sealing member seated between the valve body and the head for forming a hermetic seal therebetween.

24. A tube and valve assembly as defined in claim 1, wherein the storage chamber is substantially airless.

25. A tube and valve assembly as defined in claim 1, wherein the storage chamber defines a vacuum therein.

26. A tube and valve assembly as defined in claim 1, wherein the cover base defines a diameter less than a diameter of the body base to thereby form an interference fit therebetween

27. A tube and valve assembly for storing and dispensing a substance therefrom, comprising: a tube including a squeezable tubular body defining therein a storage chamber for receiving and storing the substance, and a head located at one end of the tubular body, wherein the head defines a neck and a first axially extending passageway formed therethrough that is coupled in fluid communication with the storage chamber of the tubular body and defines an unobstructed axially extending flow path therebetween; and a one-way valve assembly mounted on the head comprising: (a) a valve body including: a body base defining a second axially extending passageway coupled in fluid communication with the first axially extending passageway and defining an unobstructed axially extending flow path therebetween; an axially extending valve seat defining a diameter less than a diameter of the body base; a first portion extending between the body base and the valve seat; and a plurality of flow apertures axially extending through the first portion adjacent to the valve seat and angularly spaced relative to each other; and (b) a valve cover formed of an elastic material defining a predetermined modulus of elasticity, and including: a cover base mounted on the body base and fixedly secured against axial movement relative thereto; a valve portion overlying the valve seat, wherein the valve portion defines a predetermined radial thickness and a diameter less than a diameter of the valve seat to thereby form an interference fit therebetween, the valve portion and valve seat defining a normally closed, annular, axially extending valve opening therebetween, and the valve portion is movable radially between a normally closed position with the valve portion engaging the valve seat and an open position with a segment of the valve portion spaced radially away from the valve seat to allow the passage of substance at a predetermined valve opening pressure therebetween; and a second portion extending between the cover base and valve portion, overlying the first portion of the body, and forming an interference fit therebetween; and wherein at least one of the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material, is selected to (1) define a predetermined valve opening pressure generated upon manually squeezing the tube that allows passage of the substance from the storage chamber through the valve opening, and (2) hermetically seal the valve and prevent the ingress of bacteria through the valve and into the tube in the normally closed position.

28. A tube and valve assembly as recited in claim 27, wherein the cover base defines a diameter less than a diameter of the body base to thereby form an interference fit therebetween.

29. A tube and valve assembly as recited in claim 27, wherein the first and second portions are tapered.

30. A tube and valve assembly as recited in claim 24, wherein said predetermined valve opening pressure corresponds to a substantially radially directed force applied to the tubular body within the range of about 1 kg through about 6 kg.

31. A tube and valve assembly as defined in claim 2, wherein said substantially radially directed force is within the range of about 2 kg through about 4 kg.

32. A tube and valve assembly as defined in claim 3, wherein said substantially radially directed force is within the range of about 2.4 kg through about 2.9 kg.

33. A tube and valve assembly as defined in claim 27, wherein a substantially annular segment of the valve portion engages the valve seat substantially throughout any period of dispensing substance through the valve opening to maintain a hermetic seal between the storage chamber and ambient atmosphere.

34. A tube and valve assembly as defined in claim 27, wherein the valve cover and valve body define an increasing degree of interference therebetween in a direction from the interior to the exterior of the valve assembly.

35. A tube and valve assembly as defined in claim 27, wherein the valve portion defines a decreasing radial thickness when moving axially in a direction from an inner end toward a distal end of the valve seat.

36. A tube and valve assembly as defined in claim 24, wherein the plurality of angularly spaced flow apertures define a plurality of solid portions therebetween, and the cross-sectional area of the flow apertures is at least about 60% greater than the cross-sectional area of the solid portions.

37. A tube and valve assembly as defined in claim 27, wherein the degree of interference between the valve cover and valve seat is selected to create a valve opening pressure within the range of about 3 psi to about 90 psi.

38. A tube and valve assembly as defined in claim 27, wherein the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material, are each selected to (i) define a predetermined valve opening pressure generated upon manually squeezing the tube that allows passage of the substance from the storage chamber through the valve opening, and (2) hermetically seal the valve and prevent the ingress of bacteria through the valve and into the tube in the normally closed position.

39. A tube and valve assembly as defined in claim 27, wherein each flow aperture is substantially contiguous to the valve seat.

40. A tube and valve assembly as defined in claim 27, further comprising means for decreasing the valve opening pressure in the axial direction from an inner end of the valve seat toward a distal end thereof.

41. A valve assembly for attaching to a tube and dispensing a substance therefrom, the tube including a squeezable tubular body defining therein a storage chamber for receiving and storing the substance, and a head located at one end of the tubular body for engaging the valve assembly, wherein the head defines a neck and a first axially extending passageway formed therethrough that is coupled in fluid communication with the storage chamber of the tubular body and defines an unobstructed axially extending flow path therebetween, the valve assembly comprising: (a) a valve body connected to the head and including: a body base defining a second axially extending passageway coupled in fluid communication with the first axially extending passageway and defining an unobstructed axially extending flow path therebetween; an axially extending valve seat defining a diameter less than a diameter of the body base; a first substantially tapered portion extending between the body base and the valve seat; and a plurality of flow apertures axially extending through the substantially tapered portion adjacent to the valve seat and angularly spaced relative to each other; and (b) a valve cover formed of an elastic material defining a predetermined modulus of elasticity, and including: a cover base mounted on the body base and fixedly secured against axial movement relative thereto, wherein the cover base defines a diameter less than a diameter of the body base to thereby form an interference fit therebetween; a valve portion overlying the valve seat, wherein the valve portion defines a predetermined radial thickness and a diameter less than a diameter of the valve seat to thereby form an interference fit therebetween, the valve portion and valve seat defining a normally closed, annular, axially extending valve opening therebetween, and the valve portion is movable radially between a normally closed position with the valve portion engaging the valve seat and an open position with a segment of the valve portion spaced radially away from the valve seat to allow the passage of substance at a predetermined valve opening pressure therebetween; and a second substantially tapered portion extending between the cover base and valve portion, overlying the first substantially tapered portion of the body, and forming an interference fit therebetween; and wherein at least one of the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material, is selected to (1) define a predetermined valve opening pressure generated upon manually squeezing the tube that allows passage of the substance from the storage chamber through the valve opening, and (2) hermetically seal the valve and prevent the ingress of bacteria through the valve and into the tube in the normally closed position.

42. A tube and valve assembly for storing and dispensing a substance therefrom, comprising: an outer tube formed from a squeezable tubular body; a flexible inner bladder mounted within the outer tube and defining therein a storage chamber for receiving and storing the substance; an air check valve located on the outer tube for regulating a flow of air into the outer tube and, in turn, substantially preventing vacuum formation between the outer tube and the flexible inner bladder; a head located at one end of the outer tube, wherein the head defines a neck and a first axially extending passageway formed therethrough that is coupled in fluid communication with the storage chamber of the flexible inner bladder and defines an unobstructed axially extending flow path therebetween; and a one-way valve assembly mounted on the head comprising: (a) a valve body including: a body base defining a second axially extending passageway coupled in fluid communication with the first axially extending passageway and defining an unobstructed axially extending flow path therebetween; an axially extending valve seat defining a diameter less than a diameter of the body base; a first portion extending between the body base and the valve seat; and a plurality of flow apertures axially extending through the first portion adjacent to the valve seat and angularly spaced relative to each other; and (b) a valve cover formed of an elastic material defining a predetermined modulus of elasticity, and including: a cover base mounted on the body base and fixedly secured against axial movement relative thereto, wherein the cover base defines a diameter less than a diameter of the body base to thereby form an interference fit therebetween; a valve portion overlying the valve seat, wherein the valve portion defines a predetermined radial thickness and a diameter less than a diameter of the valve seat to thereby form an interference fit therebetween, the valve portion and valve seat define a normally closed, annular, axially extending valve opening therebetween, and the valve portion is movable radially between a normally closed position with the valve portion engaging the valve seat and an open position with a segment of the valve portion spaced radially away from the valve seat to allow the passage of substance at a predetermined valve opening pressure therebetween; and a second portion extending between the cover base and valve portion, overlying the first portion of the body, and forming an interference fit therebetween, wherein at least one of the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material, is selected to (1) define a predetermined valve opening pressure generated upon manually squeezing the outer tube that allows passage of the substance from the storage chamber through the valve opening, and (2) hermetically seal the valve and prevent the ingress of bacteria through the valve and into the storage chamber in the normally closed position.

43. A tube and valve assembly as recited in claim 42, wherein the outer tube has a cross-section to accommodate a user's hand.

44. A tube and valve assembly as recited in claim 42, wherein a midsection of the flexible inner bag is mounted to a midsection of the outer tube.

45. A tube and valve assembly as recited in claim 42, further comprising a base attached to the first end of the outer tube for allowing the tube to independently stand and for housing the air check valve.

46. A tube and valve assembly as defined in claim 17, wherein said means is defined by a decreasing radial thickness of the valve portion of the valve cover when moving axially in a direction from an inner end toward an outer end of the valve seat.

47. A tube and valve assembly for storing and dispensing a substance therefrom, comprising: a tube including a squeezable tubular body defining therein a storage chamber for receiving and storing the substance, and a head located at one end of the tubular body, wherein the head defines a neck and a first axially extending passageway formed therethrough that is coupled in fluid communication with the storage chamber of the tubular body and defines an unobstructed axially extending flow path therebetween; and a one-way valve assembly mounted on the head comprising: (a) a valve body including: a body base defining a second axially extending passageway coupled in fluid communication with the first axially extending passageway and defining an unobstructed axially extending flow path therebetween; an axially extending valve seat defining a diameter less than a diameter of the body base; a first portion extending between the body base and the valve seat; and a plurality of flow apertures axially extending through the first portion adjacent to the valve seat and angularly spaced relative to each other; and (b) a valve cover formed of an elastic material defining a predetermined modulus of elasticity, and including: a cover base mounted on the body base and fixedly secured against axial movement relative thereto; a valve portion overlying the valve seat, wherein the valve portion defines a predetermined radial thickness and a diameter less than a diameter of the valve seat to thereby form an interference fit therebetween, the valve portion and valve seat defining a normally closed, annular, axially extending valve opening therebetween, and the valve portion is movable radially between a normally closed position with the valve portion engaging the valve seat and an open position with a segment of the valve portion spaced radially away from the valve seat to allow the passage of substance at a predetermined valve opening pressure therebetween; and a second portion extending between the cover base and valve portion, overlying the first portion of the body, and forming an interference fit therebetween; and wherein the valve assembly further includes first means for progressively opening the valve opening and allowing the passage of substance from the storage chamber through the plurality of flow apertures upon manually squeezing the tubular body, and second means for hermetically sealing the plurality of flow apertures and preventing ingress of bacteria through the plurality of flow apertures and into the tube in the normally closed position.

48. A tube and valve assembly as defined in claim 47, wherein the first means is defined by at least one of the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material being selected to define a predetermined valve opening pressure generated upon manually squeezing the tube that allows passage of the substance from the storage chamber through the valve opening.

49. A tube and valve assembly as defined in claim 47, wherein the second means is defined by at least one of the valve seat diameter, a degree of interference between the valve cover and valve seat, the predetermined radial thickness of the valve portion, and a predetermined modulus of elasticity of the valve cover material being selected to hermetically seal the valve and prevent the ingress of bacteria through the valve and into the tube in the normally closed position.

50. A method for storing and dispensing a sterile substance comprising the steps of: providing a tube including a squeezable tubular body defining therein a storage chamber, the tube having a head located at one end of the tubular body, wherein the head defines a neck and a first axially extending passageway formed therethrough that is coupled in fluid communication with the storage chamber of the tubular body and defines an unobstructed axially extending flow path therebetween; coupling a one-way valve assembly to the tube, the one-way valve assembly having: (a) a valve body including: a body base defining a second axially extending passageway coupled in fluid communication with the first axially extending passageway and defining an unobstructed axially extending flow path therebetween; an axially extending valve seat defining a diameter less than a diameter of the body base; a first substantially frusto-conical portion extending between the body base and the valve seat; and a plurality of flow apertures axially extending through the substantially frusto-conical portion adjacent to the valve seat and angularly spaced relative to each other; and (b) a valve cover formed of an elastic material defining a predetermined modulus of elasticity, and including: a cover base mounted on the body base and fixedly secured against axial movement relative thereto, wherein the cover base defines a diameter less than a diameter of the body base to thereby form an interference fit therebetween; a valve portion overlying the valve seat, wherein the valve portion defines a predetermined radial thickness and a diameter less than a diameter of the valve seat to thereby form an interference fit therebetween, the valve portion and valve seat defining a normally closed, annular, axially extending valve opening therebetween, and the valve portion is movable radially between a normally closed position with the valve portion engaging the valve seat and an open position with a segment of the valve portion spaced radially away from the valve seat to allow the passage of substance at a predetermined valve opening pressure therebetween; and a second substantially frusto-conical shaped portion extending between the cover base and valve portion, overlying the first substantially frusto-conical shaped portion of the body, and forming an interference fit therebetween and hermetically sealing the valve assembly; storing within the hermetically sealed tubular body multiple doses of a sterile substance; dispensing a plurality of different doses of the sterile substance at different points in time by manually squeezing the tubular body to dispense each such dose; and maintaining the substance remaining in the tubular body between doses in a sterile, hermetically sealed condition.

51. A method as defined in claim 49, further comprising the step of providing the substance in a preservative-free form, and storing the preservative-free substance in a sterile, substantially airless condition throughout and between dispensing multiple doses of the substance by manually squeezing the tubular body.

52. A method as defined in claim 51, wherein the sterile, preservative free substance is for treating at least one dermatological condition.