WO1997017265A1 - Improved vented vial stopper for processing freeze-dried products - Google Patents
Improved vented vial stopper for processing freeze-dried products Download PDFInfo
- Publication number
- WO1997017265A1 WO1997017265A1 PCT/US1996/013970 US9613970W WO9717265A1 WO 1997017265 A1 WO1997017265 A1 WO 1997017265A1 US 9613970 W US9613970 W US 9613970W WO 9717265 A1 WO9717265 A1 WO 9717265A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- membrane
- stopper
- freeze
- core
- passageway
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
Definitions
- the present invention relates to an apparatus for freeze-drying various products.
- Cross contamination between different batches of product being dried at the same time is also a problem.
- Cross contamination has been shown to occur in 20 to 80% of vials in a freeze-dryer as reported by Barbaree and Sanchez, 26 Developments in Industrial Microbiology. Chapter 27 (1985).
- Freeze-drying equipment is expensive, and freeze-drying cycles are generally very long, consuming many hours or even several days for the processing of a single batch of material.
- freeze-drying manufacturers would prefer to maximize the use of their capital investment in the equipment by attempting to fully load the freeze-drying chamber every time it is cycled. This would result in the practice of freeze-drying different materials in the same chamber at the same time. Since all the materials are in open containers, cross contamination of product would occur. Because of the cross contamination and incompatibility of certain products, freeze-driers are thereby run only partially full, which increases costs.
- a container is described to protect freeze-dried products from contamination during the freeze-drying process.
- the container has at least one side that includes a hydrophobic, porous, germ-tight, water vapor-permeable membrane. Water vapor can escape the closed container through this porous membrane, while the membrane represents a barrier to contamination.
- Another technique used involves freeze-drying material in a container that has a porous hydrophobic wall. An example of this approach is taught in United States Patent 5,309,649 to Bergmann. Neither of these approaches, however, addresses the concern about rehydrating the contents of the container once the doors of the drier are opened.
- a vented vial is provided that utilizes a stopper employing a vent made from permeable PTFE membrane.
- the porous venting media provides a barrier to bacteria and particulate contamination while permitting the passage of gases, such as air and water vapor.
- gases such as air and water vapor.
- the product described in the copending patent application provides inherent improvements over existing technology insofar as chemical inertness of the stopper material. Regretfully, for some applications the stopper may not adequately combine barrier properties with sufficient chemical compatibility and other desirable properties, such as lubricity, sealing, and venting.
- the present invention comprises a conformal coating of expanded polytetrafluoroethylene (ePTFE) membrane applied to the surface of a resilient stopper to create a protective gasketing sheath.
- ePTFE expanded polytetrafluoroethylene
- This sheath provides many benefits, including: (1) lubricity such that the stopper can easily be inserted into the vial; (2) chemical protection to the resilient stopper from aggressive pharmaceuticals, which, in turn, protects the pharmaceuticals from contamination; (3) sealability or gasketabihty which ensures hermetic seal once inserted into the vial despite its surface texture and vial diameter variability.
- the effect of the present invention is that the ePTFE remains porous and permits venting of gases without letting liquids permeate through the membrane to attack the resilient material (such as butyl rubber) underneath.
- An improved embodiment of the present invention comprises a second smaller stopper combined with the first stopper described above to function as a final hermetic seal for the vial. This stopper is placed inside the larger stopper and is seated at the end of the freeze-dry process to assure a complete seal to the container.
- Figure 1 is a side elevation view of a first embodiment of a freeze-dry stopper of the present invention, including a vent passageway in phantom therethrough;
- Figure 2 is a side elevation view of a second embodiment of a stopper of the present invention, including a smaller stopper mounted on top, in up position, to allow for hermetic sealing at the end of the freeze-dry process, and seat for the smaller stopper and a vent passageway in phantom therethrough;
- Figure 3 is a side cross-section view in exploded orientation of a butyl rubber stopper, expanded PTFE membrane, and a forming die used to form the stopper of the present invention;
- Figure 4 is a cross-section view of a stopper of the first embodiment of the present invention shown placed in a freeze-dry vial;
- Figure 5 is a cross-section view of a stopper of the second embodiment of the present invention placed in a freeze-dry vial in use with a locking cap applied;
- Figure 6 is a cross-section view of still another embodiment of a stopper of the present invention.
- the present invention comprises a resilient stopper with a conformal expanded polytetrafluoroethylene (ePTFE) membrane coating.
- ePTFE polytetrafluoroethylene
- the ePTFE membrane coating is applied to the stopper and secured by use of a heated forming die, under pressure, which thermally fuses the two materials together.
- the fuse points of the stopper are any of its smooth, outward projecting surfaces. Once the membrane and stopper are completely fused together, the normally opaque membrane turns translucent to transparent.
- This method can be used for virtually any shape of rubber material as well as with other materials as described below.
- the stopper is made of butyl rubber and is also coated with a very light film of silicone oil.
- the stopper 10 of the present invention comprises a resilient stopper core 12 and an expanded PTFE membrane 14 coating most or all of the surface of the stopper that may come in contact with chemicals within a freeze-dry vial during freeze-dry processing.
- the stopper 10 of the present invention should include some means for venting of water vapor during the freeze-dry process without allowing solids or liquids to escape.
- One such means comprises providing one or more passageways 16 through the stopper, such as the one passageway 16 down the middle of the stopper 10 as shown.
- the expanded PTFE membrane 14 covers one opening 18 to the passageway 16 to provide the necessary selectively permeable barrier. As so constructed, gases can enter and leave a container protected by the stopper of the present invention, while contaminants are excluded from the container.
- the membrane comprises a porous material that provides selective air flow therethrough.
- the membrane 14 serves to protect the core 12 material from exposure to the interior of a freeze-drying vessel and vapors or material therein that may react with or degrade the stopper core. Not only does this protect the core material from attack, it also protects the contents of the vessel from contact with or outgassing from the core.
- the membrane is densified on at least some of the covered surface of the core.
- a particularly preferred embodiment of the basic stopper 10 of the present invention employs a membrane 14 that is selectively densified.
- a second embodiment of the present invention can be provided with a multiple component stopper assembly 20.
- the stopper assembly 20 includes a base stopper 10, again with a vent passageway 16, an outer protective coating 14, and a selectively sealed opening 18 as well as a seat or cavity 22 on top such that another, smaller, freeze-dry stopper 24 (or "plug") can be placed inside.
- the smaller stopper 24 includes one or more vent openings 25 therein to allow vapor to escape through the stopper assembly when the smaller stopper 24 is in an "up" position.
- the small stopper 24 is placed in the "up" position shown during the freeze-dry process to allow the water vapor passing out of the vial to escape through the membrane 14.
- the passageway 16 is sealed by inserting the smaller stopper 24 into cavity 22, so that the freeze-dry container is sealed.
- the smaller stopper 24 is adapted to be collapsed within the larger stopper 10 following freeze-drying so that a hermetic seal is created. This seal is important so that water vapor does not seep back into the vial causing premature hydration of the freeze-dried product.
- This smaller stopper 24 should have a hard Durometer (for instance, >60) to facilitate a hermetic seal.
- the insertion of the smaller stopper 24 into the larger stopper 10 may be accomplished through a variety of means.
- Each of the smaller stoppers 24 can be individually inserted after the freeze-dry process, either manually or through mechanized means.
- the smaller stoppers are automatically sealed as a group, such as collapsing a shelf upon an entire tray of containers.
- FIG. 3 A preferred method of constructing the stopper of the present invention is shown in Figure 3. First, a circular membrane patch 26 of ePTFE membrane is placed on the bottom of the stopper core 28 such that their centers are aligned. Next, a heated forming die 30 is used to conform the membrane 26 to the stopper core 28. Pressure is applied to fuse the membrane to the rubber core. Typical sealing conditions are a temperature of 220 to 350°C, a pressure of 30 to 80 psi, over a period of time of 1 to 10 seconds.
- the forming die 30 is made slightly larger in diameter than the stopper core 28 so that the membrane on the sides is not compressed. In this manner, as has been described, some of the conformable properties of the ePTFE are preserved-allowing for it to provide gasketing between the stopper and the vial. Since PTFE has a very low coefficient of friction, it allows the stopper to be easily inserted into a freeze-dry container, such as a glass vial, without addition of a lubricant, such as silicone oil, and forms a hermelic seal despite variations in the container.
- a freeze-dry container such as a glass vial
- a lubricant such as silicone oil
- the ePTFE membrane will density in those areas where full heat and pressure is applied by the forming die 30, forming a translucent or transparent PTFE layer.
- the ePTFE remains fully porous and conformable in other areas. This allows for proper gasketing, and, of course, for the controlled passage of gases through the passageway in the stopper.
- the basic stopper 10 configuration of the present invention fits into a typical freeze-dry vessel 32 in the manner shown Side-facing surface 19c, which has conformable membrane 14 attached to it, forms a tight seal against the inside of the vessel 32.
- material to be freeze-dried 34 is placed within the vessel 32 and then the vessel 32 is capped with stopper 10. During the freeze-drying process, moisture passes out of passageway 16, through the membrane 14 portion covering opening 18.
- Securing the stopper 10 of the present invention to a vessel 32 establishes a bacterial barrier between the contents of the vessel and the surrounding environment. This minimizes contamination risks and may allow transport of the vessels in other than expensive aseptic environments.
- the stopper of the present invention retains all the advantages of previous stoppers that merely employ an ePTFE membrane as a barrier layer. Moreover, the stopper of the present invention allows use of desirable resilient material like butyl rubber, without risk of chemical breakdown or incompatibility, sticking or fitting problems, or other deficiencies that exposed rubber material might experience in these applications.
- the rubber stopper is also coated with a lubricant such as a very light film of silicone oil.
- a lubricant such as silicone oil, which is normally applied to most stoppers to help the stopper fit into the vial, will cross-link under heat and pressure creating an additional adhesive bond between the stopper and the membrane.
- a locking clip 36 such as one made from plastic or metal, is provided to hold the stopper 10 in a seated position in a vial 32 or other vessel during handling.
- the locking clip or overcap 36 prevents the stopper 10 from unseating itself during transport from the freeze-drier to the capping, inspection, or packing processes within the pharmaceutical manufacturing system.
- an undipped stopper 10 will unseat itself in only a very small percentage of vials, the risk of such an event causes some manufacturers to use larger areas of aseptic environments to avoid any risk of product contamination.
- this stopper 10 comprises the multiple component stopper assembly 20 previously described. Still another embodiment of the present invention is shown in Figure 6.
- This embodiment comprises a one-piece stopper 38.
- the stopper In an "up" position, water vapor is allowed to release during freeze-drying.
- the stopper is provided with steps 40 on its sides to allow the stopper to sit in the "up” position.
- Membrane 42 gaskets to the glass vial affecting a seal, and thusly providing a sterile barrier.
- the step 40 in the stopper is such that after freeze-drying is complete, the stopper is forced “down” completing the hermetic seal for storage.
- the stopper has multiple channels 44a, 44b, 44c (could have 1 or many more) to permit vapor escape thru the membrane in the "up” position but when pressed
- the membrane used in the present invention comprises one with a minimum porosity of 50%, and a preferred porosity of 70-90%, and an air permeability of ⁇ 100 Guriey seconds, and a preferred permeability of 2-30 Guriey sec.
- the ePTFE membrane layer could also be comprised singularly or in combination of the following materials: polyamide, polycarbonate, polyethylene, polypropylene, polysulfone, polyvinyl chloride, polyvinylidene fluoride, acrylate copolymer, methacrylate copolymer, Tyvek® spunbonded olefin, and the like. Test Procedure
- the resistance of samples to air flow was measured by a Guriey densometer (ASTM D726-58) manufactured by W. & L. E. Guriey & Sons. The results are reported in terms of Guriey number which is the time in seconds for 100 cubic centimeters of air to pass through 1 square inch of a test sample at a pressure drop of 4.88 inches of water.
- Bubble point is the pressure of air required to blow the first continuous bubbles detectable by their rise through a layer of isopropyl alcohol covering the PTFE media.
- the bubble point of the porous PTFE is measured using isopropyl alcohol following ASTM Test Method F316-86.
- EXAMPLE 1 Multiple 20 mm rubber stoppers P/N 1014-5820, available from The
- the stopper was then placed bottom side up directly below the impact seal machine with aluminum die.
- the square of the membrane was then laid over the bottom of the stopper.
- the die was heated to a temperature of 330°C and then pressed down over the stopper so as to conform the sample of membrane to all surfaces using the impact heat sealer using air pressure of 40 psi for a period of 6 seconds.
- the die was then raised and removed.
- the stopper was then removed from the apparatus and observed for conformity, continuity, and durability of the membrane layer.
- the membrane could not be pulled, scratched or easily removed from the surface of the stopper yet remained pliable.
- the membrane was pulled from the stopper with much effort leaving bits and layers of membrane indicating that the bond of the rubber to membrane was greater than the cohesive strength of the membrane.
- a membrane coated stopper was than inserted within a 20 mm glass vial available from The West Company, of Lionville, PA, P/N 6800-0318.
- the stopper fit snugly but was very easy to slide within the glass vial precluding the need for added lubricant.
- EXAMPLE 2 A stopper was prepared as in Example 1 above but before sealing the membrane, a hole about 0.29 inches (7.37 mm) in diameter was drilled along the center axis from the top surface to the bottom surface of the stopper to produce a passageway therethrough.
- a membrane was affixed to it as in Example 1.
- the 13 mm stopper was a freeze- dry stopper that had an increased hardness of 70 Durometer to facilitate a good seal with the 20 mm rubber stopper. In the "up" position, the 13 mm freeze-dry stopper permits the flow of water vapor out of the vial during freeze- drying and, when pressed down into the 20 mm stopper during final processing, forms a hermetic seal.
- a stopper was prepared as in Example 2 but a recess about 0.5 inches (12.7 mm) in diameter was cut along the center axis from the top surface towards the bottom to a depth of 0.09 inches (2.28 mm).
- a membrane was affixed as in Example 1.
- a 13 mm stopper was inserted as in Example 2, however, since the 20 mm stopper has a recess cut on top, the 13 mm stopper did not stick up above the top of the 20 mm stopper when pressed down into the 20 mm stopper during final processing to form a hermetic seal. This allowed an overcap to be applied to secure the stopper assembly to the vial.
- Example 3 Component parts were prepared as in Example 3, however, a special overcap was formed from aluminum such that it sealed the 20 mm stopper to the vial. This prevented spontaneous leaking while permitting the insertion of the 13 mm stopper for freeze-drying. Once the freeze-dry process was completed, the 13 mm stopper was driven into the 20 mm stopper to form a hermetic seal which could be further secured and overcapped.
- the overcap was fashioned such that first the 13 mm stopper was assembled into the 20 mm stopper in a vial then the overcap was applied to seal the system to the vial. Overall, the 13 mm stopper can be positioned into an "up" position to allow water vapor to escape for freeze-drying. At the end of the process, the overcap is collapsed driving the 13 mm stopper into the 20 mm stopper and sealing the entire system with the collapsed overcap.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51815597A JP3773958B2 (en) | 1995-11-06 | 1996-08-22 | Improved aerated vial stopper for lyophilized product processing |
EP96932155A EP0859721A1 (en) | 1995-11-06 | 1996-08-22 | Improved vented vial stopper for processing freeze-dried products |
AU71047/96A AU7104796A (en) | 1995-11-06 | 1996-08-22 | Improved vented vial stopper for processing freeze-dried products |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/554,054 | 1995-11-06 | ||
US08/554,054 US5596814A (en) | 1995-11-06 | 1995-11-06 | Vented vial stopper for processing freeze-dried products |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997017265A1 true WO1997017265A1 (en) | 1997-05-15 |
Family
ID=24211871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/013970 WO1997017265A1 (en) | 1995-11-06 | 1996-08-22 | Improved vented vial stopper for processing freeze-dried products |
Country Status (6)
Country | Link |
---|---|
US (1) | US5596814A (en) |
EP (1) | EP0859721A1 (en) |
JP (1) | JP3773958B2 (en) |
AU (1) | AU7104796A (en) |
CA (1) | CA2232711A1 (en) |
WO (1) | WO1997017265A1 (en) |
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US10729616B2 (en) | 2014-08-04 | 2020-08-04 | Genentech, Inc. | Apparatus and methods for sealing a medicament within a medical delivery device |
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1995
- 1995-11-06 US US08/554,054 patent/US5596814A/en not_active Expired - Lifetime
-
1996
- 1996-08-22 JP JP51815597A patent/JP3773958B2/en not_active Expired - Lifetime
- 1996-08-22 WO PCT/US1996/013970 patent/WO1997017265A1/en not_active Application Discontinuation
- 1996-08-22 AU AU71047/96A patent/AU7104796A/en not_active Abandoned
- 1996-08-22 EP EP96932155A patent/EP0859721A1/en not_active Withdrawn
- 1996-08-22 CA CA002232711A patent/CA2232711A1/en not_active Abandoned
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US10729616B2 (en) | 2014-08-04 | 2020-08-04 | Genentech, Inc. | Apparatus and methods for sealing a medicament within a medical delivery device |
US11523969B2 (en) | 2014-08-04 | 2022-12-13 | Genentech, Inc. | Apparatus and methods for sealing a medicament within a medical delivery device |
Also Published As
Publication number | Publication date |
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CA2232711A1 (en) | 1997-05-15 |
EP0859721A1 (en) | 1998-08-26 |
AU7104796A (en) | 1997-05-29 |
US5596814A (en) | 1997-01-28 |
JP3773958B2 (en) | 2006-05-10 |
JP2001515435A (en) | 2001-09-18 |
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