Patent Publication Number: US-2019168930-A1

Title: Device with co-molded closure, one-way valve and variable-volume storage chamber, and related method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This patent application is a divisional of U.S. patent application Ser. No. 14/680,393, entitled “Device with Co-Molded Closure, One-Way Valve and Variable-Volume Storage Chamber, and Related Method,” to be issued as U.S. Pat. No. 10,131,474, which claims the benefit of similarly-titled U.S. patent application Ser. No. 12/901,420, now U.S. Pat. No. 8,998,034, which claims the benefit of similarly-titled U.S. Provisional Patent Application Ser. No. 61/250,363, filed Oct. 9, 2009, all of which are hereby expressly incorporated by reference as part of the present disclosure. 
    
    
     FIELD OF THE DISCLOSURE 
     The present invention relates to devices with one-way valves and variable-volume storage chambers, and more particularly, to new and improved one-way valves, devices including one-way valves and/or variable-volume storage chambers, and to related methods. 
     BACKGROUND INFORMATION 
     Prior art devices including one-way valves and variable-volume storage chambers require the separate manufacture of the one-way valves, the closures, the variable-volume storage chambers, and the housings for receiving therein one or more such components. Such prior art devices require the separate manufacture and assembly of multiple components, and in some instances, require sterilization of such multiple components prior to assembly. Such devices can be relatively expensive, and their manufacture relatively time consuming and expensive. 
     Accordingly, it is an object of the present invention to overcome one or more of the above-described drawbacks and/or disadvantages of the prior art. 
     SUMMARY OF THE INVENTION 
     In accordance with a first aspect, the present invention is directed to a one way valve comprising a semi-annular, relatively rigid valve seat defining axially-extending, opposing first marginal portions, and an axially-extending first mid-portion angularly extending between the opposing first marginal portions. A flexible valve member is superimposed on the valve seat and defines axially-extending, opposing second marginal portions fixedly secured on or adjacent to respective first marginal portions of the valve seat, and an axially-extending second mid-portion angularly extending between the opposing first marginal portions and superimposed onto the first mid-portion of the valve seat. The flexible valve cover and valve seat form a normally closed axially and angularly extending valve seam therebetween. The valve seam defines an inlet at approximately one end thereof, and an outlet axially spaced relative to the inlet at approximately another end thereof. The valve cover and valve seat define a first degree of interference therebetween at the inlet, and a second degree of interference therebetween at the outlet that is less than the first degree of interference. The valve cover is movable in response to fluid at the inlet exceeding a valve opening pressure between (i) a normally closed position with the first and second mid-portions in contact with each other and defining the normally closed seam, and (ii) a second position with at least a portion of the valve cover spaced away from the valve seat to allow the fluid to pass through the seam from the inlet through the outlet. 
     In some embodiments of the present invention, the degree of interference between the valve cover and valve seat progressively decreases from the first degree of interference to the second degree of interference. In some such embodiments, the degree of interference substantially uniformly decreases from the first degree of interference to the second degree of interference. In some embodiments, the degree of interference between the valve cover and the valve seat is higher at the marginal portions of the valve cover than at the mid-portions of the valve cover. 
     In some embodiments of the present invention, in the normally closed position, the valve cover and valve seat form a hermetic seal therebetween. In some such embodiments, in the normally closed position, the hermetic seal substantially prevents the ingress of bacteria or germs in the direction from the outlet to the inlet. In some embodiments, the valve seat is curvilinear, such as semi-circular. 
     In accordance with another aspect, the present invention is directed to a flexible valve cover formed of material with elastic properties and substantially zero creep. In some such embodiments, the material is a silicone. In some embodiments, the elastic material includes an antimicrobial additive. In some such embodiments, the elastic material is a relatively low durometer silicone including a silver-based antimicrobial additive. 
     In some embodiments of the present invention, the valve cover defines a substantially uniform thickness substantially throughout the mid-portion thereof. In some embodiments, the valve cover defines a substantially uniform thickness substantially throughout the marginal portions thereof. In some such embodiments, the valve cover defines a substantially uniform thickness substantially throughout the mid-portion and marginal portions thereof. In some embodiments, the mid-portion of the valve seat is substantially curvilinear, such as semi-circular, and in some such embodiments, the mid-portion and opposing marginal portions of the valve seat are substantially semi-circular. Preferably, the mid-portion of the valve cover is substantially in tension between the opposing marginal portions thereof. 
     In accordance with another aspect, the present invention is directed to a method comprising the following steps: 
     (i) injection molding a support and integral variable-volume storage chamber pre-form; and 
     (ii) blow molding the pre-form, but not the support, into an expanded shape forming a flexible pouch defining the variable-volume storage chamber. 
     In some embodiments of the present invention, the method further comprises the following steps: 
     (i) collapsing the flexible pouch and variable-volume storage chamber formed within the pouch; 
     (ii) sealing the interior of the variable-volume storage chamber with respect to ambient atmosphere; and 
     (iii) sterilizing the sealed variable-volume storage chamber. 
     The currently preferred embodiments of the present invention further comprise the steps of molding a closure, and assembling the molded closure to the support to seal the variable-volume storage chamber with the closure. In some such embodiments, the step of molding the closure includes co-molding a support and integral flexible valve cover, wherein the flexible valve cover is preferably a liquid silicone that is over-molded; the step of injection molding a preferably rigid support includes injection molding the support and integral valve seat; and the step of assembling the closure to the support includes superimposing the valve cover on the valve seat and forming an axially-extending, normally closed valve seam there between. In the currently preferred embodiments, the closure is snapped onto the support, and the closure defines in a single piece, a peripheral rigid snapping ring and a central elastic member. The central elastic member is preferably a silicone member that has at least two portions: (i) a valve portion which extends as a bridge across the space left open in the center by the surrounding rigid snapping ring, and (ii) a depressible dome portion forming an actuator that may be manually or otherwise engageable for actuating the device and dispensing multiple doses through the valve. The configuration of the central elastic member is such that after assembly of the closure or first support onto the second support, the valve portion forms an interference fit with the nozzle segment of the pre-form, and the dome is located above a rigid compression chamber segment of the pre-form. The bottom of the compression chamber is open in continuity with the inner channel of a hollow finger like portion of the pre-form for blow molding into the flexible pouch. 
     In some embodiments, the step of molding the closure further includes co-molding a flexible actuator, which is preferably the dome-shaped actuator described above, integral with the flexible valve cover, and the step of assembling the closure to the support further includes forming the compression chamber between the actuator and support that is connectible in fluid communication between the variable-volume storage chamber and the valve seam. 
     In some embodiments of the present invention, the step of molding the closure includes co-molding an integral support and penetrable portion, and the assembling step includes assembling the closure to the support with the penetrable portion in fluid communication with the variable-volume storage chamber. Some such embodiments further comprise the steps of introducing an injection member, such as a needle, through the penetrable portion after a pre-filling sterilizing step, introducing a substance through the injection member and into the variable-volume storage chamber, withdrawing the injection member from the penetrable portion, and resealing a resulting penetration aperture formed in the penetrable portion. In some such embodiments, the resealing step includes applying a liquid sealant to the resulting penetration aperture and hermetically resealing the penetrable portion with the liquid sealant. In some such embodiments, the liquid sealant is applied at approximately ambient temperature. In some such embodiments, the liquid sealant is a silicone and/or includes an anti-microbial additive and/or is loaded with metallic or other detectable particles. 
     In some embodiments of the present invention, the sterilizing step includes irradiating the sealed, empty variable-volume storage chamber to sterilize the chamber. Some embodiments further comprise assembling the sealed closure and collapsed pouch assembly into a relatively rigid hollow body receiving the empty collapsed pouch therein. Preferably, the sealed closure and collapsed pouch assembly is sterilized prior to assembling same into the hollow body. In some embodiments of the present invention, the collapsing step includes evacuating the pouch. The method further comprises sterile filling the collapsed pouch received within the hollow body. The method preferably further comprises substantially preventing the formation of foam within the pouch during sterile filling thereof, such as by filling an evacuated or substantially evacuated variable-volume storage chamber. 
     Some embodiments of the present invention further comprise the steps of applying to a surface of the closure and pouch assembly a fluid sterilant, and applying filtered gas at a temperature higher than ambient temperature to the fluid sterilant receiving surface to further evaporate any fluid sterilant thereon. In some such embodiments, the fluid sterilant is applied to a penetrable portion of the closure, and the method further comprises the steps of introducing an injection member through the penetrable portion after application of fluid sterilant and/or filtered gas thereto, introducing a substance through the injection member and into the variable-volume storage chamber, withdrawing the injection member from the penetrable portion, and resealing a resulting penetration aperture formed in the penetrable portion. In some such embodiments, the resealing step includes metering a liquid sealant onto the resulting penetration aperture and hermetically resealing the penetrable portion with the liquid sealant. Some such embodiments further comprise the step of forming the penetrable portion within a recess, and metering the liquid sealant into the recess to reseal the penetration aperture. 
     In accordance with another aspect, the present invention is directed to a device including a one-way valve, a first support forming the valve seat of the one-way valve thereon, and a variable-volume storage chamber extending outwardly from the first support and connectible in fluid communication with the inlet to the valve seam. In some embodiments of the present invention, the first support at least partially defines a compression chamber connectible in fluid communication between the variable-volume storage chamber and the inlet to the valve seam. 
     In accordance with another aspect of the present invention, the first support is defined by an injection molded pre-form, and the variable-volume storage chamber is defined by a flexible pouch blow molded from the injection molded pre-form. Some embodiments of the present invention further include a relatively rigid outer hollow recipient. The flexible pouch, which is preferably stretched blow molded from the pre-form, is received within the hollow outer body, and the first support is fixedly secured to the body. Some embodiments of the present invention further comprise a closure including a second support formed integral with the valve cover and fixedly connectible to the first support with the valve cover superimposed on the valve seat. In some embodiments, the first support at least partially defines a compression chamber connectible in fluid communication between the variable-volume storage chamber and the inlet to the valve seam, and the second support includes an actuator movable between first and second positions for pressurizing fluid within the compression chamber above the valve opening pressure to, in turn, dispense the fluid through the one-way valve. 
     In some embodiments of the present invention, the actuator is a flexible member formed integral with the valve cover. In some such embodiments, the valve cover and flexible actuator are co-molded with the second support. In some such embodiments, the actuator is substantially dome-shaped. In some embodiments, the substantially dome-shaped actuator defines a manually-engageable surface that is manually engageable and movable between the first and second positions. In some embodiments of the present invention, the closure defines a peripheral sealing member formed integral with the flexible valve member and actuator and forming a dry compression seal between the closure and first support. The first and second supports are sealed together, and are preferably snapped together to form a sealed enclosure. The sub-assembly of the first and second supports forms itself essentially the whole liquid container, which may be sterilized after assembly. One of the advantages of this sub-assembly, is that it is formed of only two parts forming a fluid-tight seal therebetween, and is further characterized by a collapsible pouch, which is collapsed, preferably by vacuum, in order to reduce to a minimum the volume to be sterilized. It is particularly advantageous when such sterilization is achieved by radiation. Another advantage of the enclosure sub-assembly, is that it may include a clear transparent base, injection molded in one piece with the pre-form, which allows the use of high energy light for sterilization of the whole enclosure, such as a pulsed UV sterilizing radiation. 
     Some embodiments of the present invention further comprise a penetrable portion configured to receive therethrough an injection member for sterile filling the variable-volume storage chamber with a substance. The substance may take the form of any of numerous different substances that are currently known or that later become known, such as sterile foods or beverages, including without limitation milks, milk-based products and liquid nutrition products, pharmaceuticals, ophthalmic products, dermatological products, including creams, gels or other liquids of any desired viscosity, and nutritional supplements. Some such embodiments further comprise a sealant overlying a resulting penetration aperture formed in the penetrable portion after removal of the injection member therefrom that hermetically seals the penetration aperture. In some such embodiments, the sealant is a liquid silicone. In some such embodiments, the liquid silicone is room temperature curing. The liquid silicone or other sealant is preferably identical or substantially the same as a liquid silicone or other elastic material, that preferably exhibits substantially zero creep, that is over molded on a relatively rigid snapping ring of the first support. One or more drops of the same liquid silicone or other sealant used to seal the pin hole or other penetration aperture resulting from a piercing member for sterile filling, is preferably blended with one or several of the following elements: (i) an antimicrobial additive, (ii) a colorant for visual inspection and quality control, and/or (iii) a metal or other detectable particles or substances loaded into the liquid silicone for in-line magnetic or other automated sensor detection of the amount of such particles or other detectable substance, and thus the amount of liquid silicone applied to reseal the penetration aperture. The liquid silicone or other sealant may be applied and received within a recess molded in an actuation dome or other surface of the device that defines the penetration region for sterile filling therethrough. 
     One advantage of the device and method of the present invention, and/or of the currently preferred embodiments thereof, is that the closure, valve cover and actuator can be co-molded as a single part, the base defining the valve seat, compression chamber and variable-volume storage chamber pre-form can be injection molded as a single part, and therefore the device can be formed in essentially two parts that can be easily assembled, such as by snap fitting the closure to the base. Accordingly, the device can be manufactured with significantly fewer parts than prior art devices, yet can exhibit comparable or even greater functionality than such prior art devices. 
     Another advantage of the preferred embodiments is that the device and method allow the capacity to fill viscous products and to re-seal at room temperature, even over a residue, due to the cavity being made for the purpose of sealing, and being made of the same material or substantially the same material as the sealant. 
     Another advantage of the currently preferred embodiments is the self resealing property of the elastic and the relatively thick silicone dome actuator which prevents any ingress after filling. As a result, the sterile filling machine used to fill the device may be relatively inexpensive, whether it includes a laser for resealing, and/or involves the assembly of an additional part for mechanically resealing the resulting penetration aperture. 
     Another substantial advantage of the preferred embodiments is that the valve is extremely simple, and the tension only of the elastic valve segment after assembly onto the second support allows the valve characteristics to be adjusted to the viscosity of the product to be sealed within the device and dispensed through the valve. Any residue left in between the valve and the underlying nozzle is forced out by the interference/hoop stress differential between the valve and nozzle from the base to the dispensing tip of the valve. 
     Another advantage of the currently preferred embodiments is that the elastic valve member is easy to assemble onto the rigid underlying nozzle of the enclosure and thereby provides a high quality product at a relatively inexpensive cost. 
     Another substantial advantage of the preferred embodiments is the possibilities offered by the relatively thin wall of the stretched blow molded pouch, and as a consequence, the extremely small amount of plastic needed to form the liquid container itself, which may be made of only two pieces. Yet another advantage is that the outer housing or recipient can be made out of a fully bio degradable material, of a re-usable material and/or an entirely recyclable material, knowing that the enclosure can be disassembled automatically from the outer recipient. 
     Other objects and advantages of the present invention, and/or of the currently preferred embodiments thereof, will become more readily apparent in view of the following detailed description of the currently preferred embodiments and accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross-sectional view of an assembled closure including a co-molded one-way valve, dome-spring actuator and support that is fixedly connected to an injection molded base including a valve seat and variable-volume storage chamber pre-form. 
         FIG. 2  illustrates sequential perspective views of the base of  FIG. 1  including the injection molded variable-volume storage chamber pre-form, and showing the manner in which the injection molded pre-form is blow molded into a flexible pouch forming the variable-volume storage chamber. 
         FIG. 3  illustrates sequential perspective views of the base of  FIG. 1  showing the manner in which the flexible pouch is collapsed by applying vacuum thereto prior to sterile filling. 
         FIG. 4  is a perspective view illustrating the assembled closure, including the integral one-way valve and dome-spring actuator, and collapsed flexible pouch assembly, prior to sterile filling. 
         FIG. 5  illustrates sequential perspective views of the sterilized closure and collapsed pouch assembly, and showing insertion of the sterilized assembly into a container housing prior to sterile filling. 
         FIG. 6  illustrates sequential perspective views of the assembled dispenser undergoing surface sterilization with a fluid sterilant, such as vaporized hydrogen peroxide (“VHP”), and evaporation thereof with heated filtered air prior to sterile filling. 
         FIG. 7  illustrates sequential perspective, cross-sectional views of the assembled dispenser undergoing sterile needle filling of the variable-volume storage chamber. 
         FIG. 8  is a perspective view illustrating resealing of the resultant penetration aperture with a liquid sealant, such as a room temperature vulcanizing silicone sealant, to hermetically reseal the closure and sterile product within the variable-volume storage chamber. 
         FIG. 9  illustrates perspective views of a family of dispensers embodying the present invention in different sizes. 
         FIG. 10  illustrates partial, cross-sectional views of the one-way valve of the devices of  FIGS. 1-9 . 
     
    
    
     DETAILED DESCRIPTION OF CURRENTLY PREFERRED 
     Embodiments of the Present Invention 
     In  FIGS. 1-10 , a device embodying the present invention is indicated generally by the reference numeral  10 . The device  10  includes a first piece  12  that is secured to a second piece  14  to form a sealed, empty device. The first piece  12  defines an integral first support  16 , actuator  18  and flexible one-way valve or valve cover  20 . The components of the first piece  12  are co-molded, such as by injection molding the first support  16 , and over molding the actuator  18  and valve cover  20  to the first support  16 . The second piece  14  includes a second support  22 , a valve seat or nozzle  24 , and a variable-volume storage chamber pre-form  26 . As described further below in connection with  FIG. 2 , the pre-form  26 , but not the second support  22  and valve seat  24 , is blow molded into a flexible pouch defining a variable-volume storage chamber  30 . 
     The first piece  12  further defines a recess  32 , which as described further below in connection with  FIGS. 7 and 8 , defines a needle penetrable region that is penetrable by a needle or other injection member to sterile or aseptically fill the variable-volume storage chamber  30 . The recess  32  is adapted to receive a substantially metered amount of a liquid sealant, such as a silicone sealant, to hermetically seal the resulting needle penetration aperture and thereby hermetically seal the sterile filled substance within the variable-volume storage chamber  30 . 
     As described further below, the flexible valve cover  20  and relatively rigid valve seat  24  form a one-way valve  34  defining an axially-elongated, normally closed interface or valve seam  36  therebetween. The first piece  12  and second piece  14  cooperate to define a compression chamber  38  that is connectible in fluid communication between the variable-volume storage chamber  30  and an inlet  40  to the normally closed valve seam  36  of the one-way valve  34 . An annular check valve  42  is co-molded with the valve cover and actuator, and formed between the variable-volume storage chamber  30  and the compression chamber  38 . As described further below, movement of the actuator  18  draws substantially metered amounts of the substance stored in the variable-volume storage chamber  30  through the check valve  42  and into the compression chamber  38  and, in turn, pressurizes the substance in the compression chamber above a valve opening pressure to dispense the substance through the normally closed valve seam  36  of the one-way valve  34  and out of the device. The first piece  12  further defines a resilient sealing member  44  co-molded with the valve cover, actuator and check valve, and extending about the periphery of the first piece. The second piece  14  defines a peripheral sealing surface  46  that engages the resilient sealing member  44  to form a compression seal therebetween to hermetically seal the interior of the device with respect to ambient atmosphere. The first support  16  defines on an interior surface thereof an annular groove  48  and an annular chamfer  50  formed adjacent to the annular groove. The second support  22  defines an annular flange  52  that is received within the annular recess  48  of the first support to fixedly secure the two supports together. The annular chamfer  50  facilitates movement of the second support  22  into the first support  16  and, in turn, snap fitting the peripheral flange  52  into the recess  48 . Upon receiving the flange  52  into the recess  48 , the sealing surface  46  compressively engages the sealing member  44  to form a dry, compression seal. 
     In the illustrated embodiment, the actuator  18  is substantially dome-shaped, and is formed of a resilient and/or elastomeric material. The dome-shaped actuator  18  defines a substantially dome-shaped spring that allows the actuator to be depressed inwardly to compress the compression chamber  38  and, in turn, dispense substantially metered volumes of substance through the one-way valve  34 . A second substantially dome-shaped spring  54  is formed integral with the actuator, and is spaced axially and radially inwardly from the interior surface of the actuator  18  to define the compression chamber  38  therebetween. As can be seen, the spring  54  defines a curvilinear, substantially dome-shaped wall providing the spring with a substantial dome shape. The second piece  22  defines a boss  56  forming the inlet and outlet of the variable-volume storage chamber  30 . The spring  54  defines an annular base  58  that is axially and radially spaced relative to the boss  56  to form an annular fluid-flow path therebetween. The second support  22  defines an annular recess  60  that receives therein the annular base  58  of the spring  54 . The annular recess  60  defines an annular fluid flow path between the variable-volume storage chamber  30  and the one-way check valve  42 . 
     In order to actuate the device  10 , the actuator  18  is depressed inwardly to compress the substance within the compression chamber  38  above the valve opening pressure. As the actuator  18  is depressed inwardly, the annular base  58  of the spring  54  is moved axially inwardly, and radially outwardly within the annular recess  60  of the second support  22 . This forces the resilient annular check valve  42  radially outwardly against the annular sealing surface of the second support  22  to thereby maintain the check valve in the closed or sealed position, and in turn allow pressurization of the substance within the compression chamber above the valve opening pressure. The annular recess  60  also operates to stop further axial and radial movement of the base  58  with further inward movement of the actuator  18  to thereby progressively decrease the volume of the compression chamber  38  as the actuator  18  is further depressed. When the substance within the compression chamber  38  exceeds the valve opening pressure, the substance is forced through the inlet  40  and normally closed seam  36  of the one-way valve  34  and out of the device. Then, the actuator  18  is released which, in turn, allows the dome-spring of the actuator  18  and dome spring  54  to drive the actuator outwardly and into its ambient or rest position, as shown typically in  FIG. 1 . During movement from the depressed position to the rest or ambient position, the compression chamber  38  is expanded which, in turn, draws a substantially metered amount of substance from the variable-volume storage chamber  30 , through the annular recess  60  and check valve  42 , and into the compression chamber  38 . The device  10  is then ready to dispense another metered amount of substance by repeating the foregoing steps. The actuator  18  may be manually engaged and depressed by a using the finger(s) of the same hand that is holding the device, or the device may be mounted within an apparatus known to those of ordinary skill in the pertinent art that includes an actuating device that engages the actuator  18  to depress the actuator. 
     As shown best in  FIG. 10 , the one way valve  34  comprises a semi-annular, relatively rigid valve seat  24  defining axially-extending, opposing first marginal portions  62 , and an axially-extending first mid-portion  64  angularly extending between the opposing first marginal portions  62 . The flexible valve member  20  is superimposed on the valve seat  24  and defines axially-extending, opposing second marginal portions  66  that are fixedly secured on or adjacent to the respective first marginal portions  62  of the valve seat  24 . The valve cover  20  further defines an axially-extending second mid-portion  68  angularly extending between the opposing first marginal portions  66  and superimposed onto the first mid-portion  64  of the valve seat  24 . In the illustrated embodiment, the mid-portions  64 ,  68  are curvilinear, and are substantially semi-circular. However, as may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, the valve seat and valve cover may define any of numerous other curvilinear shapes, any of numerous other combinations of curvilinear and flat shapes, and/or a substantially flat or planar shape. The flexible valve cover  20  and valve seat  24  form the normally closed axially and angularly extending valve seam  36  therebetween. The valve seam  36  defines an inlet  70  at approximately one end thereof, and an outlet  72  axially spaced relative to the inlet at approximately another end thereof. As shown in  FIG. 10 , the valve cover  20  and valve seat  24  define a first degree of interference  74  therebetween at the inlet  70 , and a second degree of interference  76  therebetween at the outlet  72  that is less than the first degree of interference  74 . As shown in  FIG. 10 , the valve cover  20  is movable in response to fluid at the inlet  70  exceeding a valve opening pressure between (i) a normally closed position with the first and second mid-portions  64 ,  68  in contact with each other and defining the normally closed seam  36 , and (ii) a second or open position with at least a portion of the valve cover  20  spaced away from the valve seat  24  to allow the fluid or other substance to pass through the seam  36  from the inlet  70  through the outlet  72 . For example, as shown typically in  FIG. 10 , the pressurized fluid may cause axially spaced segments of the valve cover to sequentially move between the normally closed and open positions while the fluid moves from the inlet through the outlet of the valve. 
     In the illustrated embodiment, and as indicated by the broken lines in  FIG. 10 , the degree of interference between the valve cover  20  and valve seat  24  progressively decreases from the first degree of interference  74  to the second degree of interference  76 , i.e., the deeper the broken line from the respective interface, the greater the interference. Also in the illustrated embodiment, the degree of interference substantially uniformly decreases from the first degree of interference  74  to the second degree of interference  76 . In addition, as also indicated by the broken lines in  FIG. 10 , the degree of interference between the valve cover  20  and the valve seat  24  is higher at the marginal portions  66 ,  66  of the valve cover than at the mid-portion  68  of the valve cover. As can be seen, in the normally closed position, the valve cover  20  and valve seat  24  form a hermetic seal at the seam  36 . In the illustrated embodiment, in the normally closed position, the hermetic seal substantially prevents the ingress of bacteria or germs in the direction from the outlet to the inlet. 
     In the illustrated embodiment, the flexible valve cover  20  is formed of an elastomeric material that exhibits substantially zero creep. In one currently preferred embodiment, the elastomeric material is a silicone. In another currently preferred embodiment, the elastomeric material includes an antimicrobial additive to further prevent any bacteria, germs or other microbial substances from entering the seam  36  of the valve or otherwise collecting on the dispensing tip of the valve. In another currently preferred embodiment, the elastomeric material is a silicone elastomer including a silver-based or other antimicrobial additive. Exemplary silicone elastomeric compounds for forming the valve cover and/or other features formed integral with the valve cover, including the actuator and sealing member, include any of numerous different liquid silicone rubbers, such as any of the liquid silicon rubbers sold by General Electric Company and/or Momentive Performance Materials under the LIM® trademark, including LIM 8040, or other liquid silicone rubbers, silicones or silicone-based elastomers, such as the antimicrobial elastomers sold by General Electric Company and/or Momentive Performance Materials under the StatSil™ trademark. 
     As can be seen, in the currently preferred embodiments, the valve cover  20  defines a substantially uniform thickness substantially throughout the mid-portion  68  thereof and substantially throughout the marginal portions  66  thereof. The mid-portion  68  of the valve cover  20  is substantially in tension between the opposing marginal portions  66 ,  66  thereof. As shown in  FIG. 10 , the second support  22  defines a plurality of relatively sharp protuberances  78  that engage the undersides of the marginal portions  66 ,  66  of the valve cover  20  to fixedly secure the valve cover relative to the valve seat. As shown typically in  FIG. 4 , the first support  16  overlies the base and marginal portions of the valve cover to compress these portions of the valve cover against the valve seat and/or second support  22 , and thereby fixedly secure the valve cover to the valve seat and form the one-way valve. As shown in  FIG. 4 , the first support  16  defines an arcuate shaped base clamping surface  80  and opposing marginal portion clamping surface  82  that extend axially along the marginal portions of the valve cover, and extend progressively radially outwardly from the mid-portion of the valve cover when moving in the direction from the inlet toward the outlet of the valve. 
     As shown typically in  FIG. 2 , the second piece  14  includes an injection molded pre-form  26 , and the variable-volume storage chamber  30  is defined by a flexible pouch  28  blow molded from the injection molded pre-form  26 . A significant advantage of this feature is that the variable-volume storage chamber, valve seat, and part of the compression chamber, can be formed in one part as the second piece. Yet another advantage is that the valve seat and second support can be injection molded and formed to relatively tight tolerances, whereas the pre-form can be blow molded into the flexible pouch forming the variable-volume storage chamber while nevertheless maintaining the relatively tight tolerances of the other features of the second piece requiring such tolerances. As indicated in  FIG. 2 , after the second piece  14  is injection molded, the pre-form  26  is preheated and then stretch blow molded to form the pouch  28  in a manner known to those of ordinary skill in the pertinent art. In the illustrated embodiment, the second piece  14  and thus the pre-form  26  is made of PET or PP (polypropylene). However, as may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, these components may be made of any of numerous different materials, and may define any of numerous different layers of material(s), or combinations of different materials forming the different features of the second piece, that are currently known, or that later become known. For example, the second piece, or the pre-form thereof, may be defined by a multi-layered, or laminated material to provide the desired barrier properties and/or internal surfaces for contact with the product to be stored therein. 
     As shown in  FIG. 3 , after blow molding the pre-form into the pouch  28 , the pouch is collapsed, such as by pulling a vacuum on the variable-volume storage chamber  30 . Then, as shown in  FIG. 4 , the first piece  12 , which defines a device closure, is assembled to the second piece  14  to hermetically seal the variable-volume storage chamber  30  and form the one-way valve  34 . As indicated above, the first piece or closure  12  is assembled to the second piece  14  by snap fitting the two parts at the peripheral flange  52  and annular groove or recess  48 . After assembly of the first and second pieces  12  and  14 , respectively, the sealed empty device is sterilized. In the illustrated embodiment, the device is sterilized by subjecting it to irradiation, such as ebeam or gamma radiation. However, as may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, any of numerous different methods or apparatus for sterilizing the device and/or the internal surfaces and cavities thereof, that are currently known, or that later become known, equally may be employed. 
     As shown in  FIG. 5 , the device  10  further includes a relatively rigid, hollow body or housing  84 . The flexible pouch  28  is received within the hollow body  84 , and the first support  16  is fixedly secured to the body. The housing  84  includes a base  86 , which in the illustrated embodiment is flared, to support the device on a surface, and an upper support  88  that is secured to the first support  16  of the closure to attach the housing to the closure. As shown in  FIG. 1 , the second support  22  defines a depending, substantially annular flange  90  and a substantially annular recess  92  extending radially between the annular flange and the chamfer  50  of the first support  16 . As shown in  FIG. 7 , the upper support  88  of the housing defines an upwardly extending, substantially annular flange  94  that is received within the annular recess  92  to secure the housing to the assembled first and second supports  16  and  22 , respectively. In the illustrated embodiment, the annular flange  94  is press fit within the annular recess  92 ; however, as may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, the flange  94  or housing  84  can be secured to the closure or first and/or second supports in any of numerous different ways that are currently known, or that later become known. 
     As shown in  FIG. 6 , the sealed, empty, sterilized device is then readied for sterile or aseptic filling by sterilizing again the penetrable region of the device (e.g., in case such surfaces are contaminated during transport or assembly post sterilization of the device). First, a fluid sterilant, such as vaporized hydrogen peroxide, is applied to the penetrable surface of the recess  32  of the actuator  18  to re-sterilize such surface(s). Second, a heated filtered gas, such as air, is applied to the fluid-sterilant receiving surface(s) to further evaporate such sterilant and provide a dry, sterilized, penetrable surface. 
     As shown in  FIG. 7 , the sealed, empty sterile device is then sterile or aseptically filled by introducing an injection member, such as a needle  96 , through the penetrable portion at the base of the recess  32 , introducing a substance  98  through the injection member and into the variable-volume storage chamber  30 , withdrawing the injection member from the penetrable portion, and resealing a resulting penetration aperture formed in the penetrable portion. One advantage of collapsing the pouch  28  prior to filling is that there is very little, and preferably substantially no air in the variable-volume storage chamber  30  prior to filling, thus preventing or substantially preventing the formation of foam during filling of a liquid substance  98  into the variable-volume chamber. This can be a significant advantage with respect to increasing filling speeds, particularly with liquid substances that have a tendency to foam during filling, such as with liquid foods and beverages, such as milks or milk-based products, and other liquid products. Accordingly, the device and method of the present invention can provide significantly increased filling speeds in comparison to the prior art. 
     In the illustrated embodiment, and as shown in  FIG. 8 , the resealing step includes applying a liquid sealant  100  to the resulting penetration aperture formed in the recess  32  and hermetically resealing the penetrable portion with the liquid sealant. In the illustrated embodiment, the liquid sealant is applied at approximately ambient temperature. In the currently preferred embodiment, the liquid sealant is a silicone. However, as may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, the liquid sealant can take the form of any of numerous different sealants that are currently known, or that later become known. As can be seen, a resealing device  102  is mounted over the devices to be resealed after needle filling. The resealing device  102  includes a source of liquid sealant  100 , or is coupled in fluid communication with a source of liquid sealant, and a pump  104  for pumping metered amounts of the liquid sealant onto the penetrated regions of the devices to hermetically reseal the penetration apertures, and thus hermetically seal the aseptically filled product within the variable-volume storage chamber  30 . The pump  104  may take the form of a piston-type pump as shown, or may take the form of any of numerous other mechanisms for metering volumes or other measured amounts of liquid sealant onto the penetration apertures of the devices to seal the apertures, that are currently known, or that later become known, such as systems with pressurized liquid sealant and valves for releasing the pressurized sealant. The resealing device  102  may be fixedly mounted over a motorized conveyor for transporting the devices  10 , or may be movable relative to the devices, to align a dispensing port  106  of the device with the penetration aperture(s). An overpressure of sterile filtered air of other gas may be supplied into a chamber or barrier enclosure containing the needle(s) and liquid resealing device(s) to further prevent contamination of devices during the needle filling and liquid resealing process. If desired, the system may include a plurality of needles mounted on a manifold that is driven vertically, or on which the needles are driven vertically, into and out of engagement with the penetrable portions of the devices, and a plurality of liquid resealing devices mounted adjacent to, or downstream of, the needles for liquid resealing the penetration apertures. 
     In an alternative embodiment, rather than sterile filling the device with a needle or other injection member, and resealing the resulting penetration aperture, the device may include a second filling valve formed integral and co-molded with the dispensing valve to allow sterile filling of the variable-volume storage chamber through the filling valve. In this alternative embodiment, the second support of the closure includes co-molded therewith a first integral flexible valve cover and a second integral flexible valve cover. The first support includes a first valve seat and a second valve seat. The first valve cover is superimposed on the first valve seat and forms a first dispensing valve defining a first axially-extending, normally closed dispensing valve seam, and the second valve cover is superimposed on the second valve seat and forms a second filling valve defining a second axially-extending, normally closed filling valve seam. The first support at least partially defines the compression chamber connectible in fluid communication between the variable-volume storage chamber and the inlet to the first dispensing valve seam, and the second support defines an actuator movable between first and second positions for pressurizing fluid within the compression chamber above the valve opening pressure and, in turn, dispensing the pressurized fluid through the dispensing valve. The dome-shaped or other flexible actuator is formed integral and co-molded with the first and second valve covers. 
     In the method of forming the device of this alternative embodiment, the step of molding the closure includes co-molding the second support with the first integral flexible valve cover and the second integral flexible valve cover. The step of injection molding the support includes injection molding the support with the first integral valve seat and the second integral valve seat. The step of assembling the closure to the support includes (i) superimposing the first valve cover on the first valve seat and forming the first dispensing valve defining the first axially-extending, normally closed valve seam, and (ii) superimposing the second valve cover on the second valve seat and forming the second filling valve defining the second axially-extending, normally closed valve seam. After the sterilizing step, a filling member, such as a hollow cannula coupled in fluid communication with a pump or pressurized source of product to be sterile filled, is placed in fluid communication with the normally closed valve seam of the second filling valve. Then, the substance is sterile filled through the filling member and into the second normally closed valve seam at a pressure at or above a valve opening pressure of the second normally closed valve seam and into the variable-volume storage chamber. After the variable-volume storage chamber is sterile filled with the substance, the filling member is withdrawn from the second valve. The sterile filled substance is maintained hermetically sealed within the variable-volume storage chamber throughout a shelf life and between multiple doses of substance from the variable-volume storage chamber through the first dispensing valve. 
     One advantage of the device and method of the present invention is that the device may be manufactured in essentially two parts forming a sealed, empty, sterile variable-volume storage chamber that is ready for aseptic filling by needle penetration and resealing by liquid sealant or by any of numerous other sterile filling methods or devices that are currently known, or that later become known. Yet another advantage is that the housing or outer body may be formed of a relatively inexpensive material, such as recycled plastic, cardboard, or other biodegradable materials, that after use may be automatically disassembled into (1) the collapsed plastic bag and closure that can be recycled, and (2) the outer bottle or body which can be biodegradable. Alternatively, the housing can be reusable such that the collapsed pouch and closure can be removed from the housing, and a fresh pouch and enclosure can be inserted into the housing as many times as desired. 
     A significant advantage of the currently preferred embodiments is that the following features are provided in only two parts: zero possible ingress in a multi-dose delivery system; a non-contamination valve; a sterile filling port; a metering dose pump; a collapsible pouch defining a sealed, variable-volume storage chamber; and a compression chamber in fluid communication between the variable-volume storage chamber and the non-contamination valve and forming part of the metering dose pump. Yet another advantage of the currently preferred embodiments is that they provide the possibility to stay with a two piece collapsible assembly or to add a more rigid container that is completely bio-degradable, re-usable and/or recyclable. A still further advantage is that the unique valve prevents any ingress of any germs, bacteria or other unwanted substances, and thus prevents contamination of the product stored within the interior of the device which, in turn, may significantly increase the stability of the product. A still further advantage is that there is no need to refrigerate the container or other device, even after multiple dose delivery, since the variable-volume storage chamber remains hermetically sealed and each dose is sterile from the first to the last. Another advantage of the currently preferred embodiments is that the package provides a unique means to reduce the carbon foot print of the packaging in comparison to prior art packages. For example, there is no need to re-heat the product after filling (such as with retort processing), and there is no need to refrigerate the product or container after dispensing or between dispensing multiple doses over extended periods of time. Yet another advantage of the currently preferred embodiments is that they can provide a high, and even unmatched, safety level assurance in a very price competitive package. 
     As may be recognized by those of ordinary skill in the pertinent art based on the teachings herein, numerous changes may be made to the above-described and other embodiments of the present invention without departing from the scope of the invention. For example, the device may be sterile filled in any of numerous different ways, including by needle penetration and laser resealing, or valve-in filling. The actuator, one-way valve, housing and other components of the device may be formed of any of numerous different materials or combinations of materials, may take any of numerous different shapes and/or configurations, and may be manufactured in accordance with any of numerous different methods or techniques, that are currently known or that later become known. In addition, the devices may include few or more components or features than the embodiments described herein. Further, the variable-volume storage chamber may be formed of any of numerous different materials or configurations, in accordance with any of numerous different manufacturing techniques, that are currently known or that later become known. In addition, the term “semi-annular” is used herein to mean a portion of, or less than 360° of a surface, but does not require that the surface be circular or defined by a portion of a circle. Rather, the semi-annular surface may be curvilinear in part and/or substantially flat in part. Accordingly, this detailed description of currently preferred embodiments is to be taken in an illustrative as opposed to limiting sense.