Patent Grant
11590055
The present invention generally relates to the protection of a flexible pouch specially designed to contain a biopharmaceutical fluid and more broadly to a system for containing a biopharmaceutical fluid. The invention also relates to methods for manufacturing/assembling such a system that is adapted for freezing and thawing the biopharmaceutical fluid within the system. A biopharmaceutical fluid means a biotechnological derived fluid, for example a fluid derived from a culture medium, a cell culture, a buffer solution, an artificial nutrition liquid, a blood fraction, a blood derived component or a pharmaceutical fluid or, more broadly, a fluid specifically designed to be used in the medical field. Of course, the fluid may become solid or partly solid after freezing (typically at a temperature much lower than 0° C.).
It is known to use a flexible pouch to contain biopharmaceutical fluid. The flexible pouch is able to withstand low mechanical stress without damage. Hence, the leakage risk is reduced. Moreover, the flexible pouch is advantageous since it can be folded or stored flat when there is no biopharmaceutical fluid inside. Hence, the flexible pouch occupies a small volume.
The flexible pouch is generally designed for a single use and to contain a biopharmaceutical fluid volume which is between 1 liter and 500 liters.
However, specifically for shipping of the flexible pouch filled with fluid, for example, between several plant areas or from the provider of the fluid to its client which will use it, but also for storage, the flexible pouch must be protected, although the leakage risk is small.
The document EP-2 322 442 discloses a container for a flexible pouch. The container comprises a lower part and an upper part which are rigid and joined along a common edge and which form a single piece container. The container has a volume which is much more important than the volume of the flexible pouch. Consequently, the container has a useless volume. Moreover, if the flexible pouch is not retained by suitable positioning means provided in the container, it could be moved within the container, especially during shipping. Thus, the leakage risk increases.
Single-use polymeric containers, hereafter called bags or pouches, are successfully used for the storage of biopharmaceuticals in liquid state. Today, bags made of ethylene vinyl acetate (EVA) or low-density polyethylene (LDPE) have been found suitable for the storage and shipping of biological bulks at ambient or cold temperature (2 to 8° C.). However, problems exist in freezing applications with bags as currently configured. At low temperatures, the physical properties of plastic materials may change sufficiently to introduce brittleness that can reduce the capacity of the bag to absorb external forces, i.e., shocks without fracturing. In addition, ice volumetric expansion can cause significant mechanical stress leading to bag, port, tubing, or connector breakage. It is well known that current commercially available unprotected bags do not adequately protect frozen products.
To eliminate problems related to bag breakage, Sartorius Stedim Biotech has developed the Celsius™ FFT concept (FFT for “Flexible Freeze and Thaw”), which combines a flexible pouch with a semi-rigid protective shell. The contribution of the protective shell is predominant in the absorption of stresses resulting from processing or handling conditions.
Document US 2018/125757 provides a protecting body, so that the flexible pouch is sandwiched by the two plates of the protecting body, with a constraining effect. A freeze/thaw protection system may be obtained, by combining a single-use flexible container wrapped by such a protecting body and a protective shell. However, uniform fluid distribution may be difficult because, in a filled state of the flexible container, a significant bulge (big belly) in the middle is formed. In frozen state, ice expansion is thus relatively significant, and more time will be needed to freeze this big mass in the middle of the interior volume of the pouch.
Besides, some radial/transverse folds or waves may be formed at the pouch outer surfaces during filling, which may interfere with appropriate fluid distribution, especially in the four corner regions.
Document WO 2015/200218 discloses a single-use flexible freezer bag, in which a tufting coupling is provided, in order to divide the cavity of the container into a plurality of regions. This is of interest to limit risk of having a significant bulge, so that liquid mass concentration is prevented in a middle part of the flexible container. Such design cannot be widely used, especially because the bag design is more complex, which increases the cost of the single-use container. Besides, this kind of container cannot extend planar in empty state and may be more difficult to be drained, especially if the container is filled with a large volume of fluid.
The purpose of the present invention is to provide a protecting device for obtaining a robust freeze/thaw containment and protection system efficient for limiting liquid mass concentration in middle area of a flexible pouch (typically a 2D-pouch than inflates in a filled state), while keeping flexibility of design for the flexible pouch.
To this end, embodiments of the present invention provide a protecting device for use in freezing, storing and thawing biopharmaceutical materials contained in a flexible pouch, the protecting device comprising:
a protecting body comprising two plates for protecting the flexible pouch, the protecting body comprising a longitudinal axis and having four sides, the four sides comprising two longitudinal sides extending parallel to the longitudinal axis and two other sides that include a first end side and a second end side each perpendicular to the longitudinal axis,
an attachment system for fastening the two plates so that in an assembled state of the two plates, the protecting body comprises a peripheral margin that extends annularly in a protecting body reference plane, the peripheral margin being provided with at least one opening able to receive at least one port of the flexible pouch;
wherein the two plates define two mutually unfixed facing parts forming a covering part for covering the flexible pouch, the covering part being surrounded by the peripheral margin;
wherein in the assembled state:
the protecting body extends planar in an empty state of the flexible pouch, along the protecting body reference plane;
the two plates are configured to sandwich the flexible pouch for constraining the flexible pouch in a filled state of the flexible pouch, the protecting body being deformable due to shrinking of the two plates in at least one direction belonging to the protecting body reference plane; and
the two plates respectively form a first outer surface and a second outer surface of the protecting body, facing in opposite directions, at least one amongst the first outer surface and the second outer surface being a surface having a plurality of ribs, which extend at least on a peripheral annular region of the covering part, along the peripheral margin.
With such ribbing, geometry of the protecting device in filled state of the pouch constrained by the plates can be impacted favorably. For large volumes (about 50 liters, 75 liters or more for instance), a full surround rib or similar pattern of ribs parallel to the peripheral margin can prevent undesirable formation of waves that create dead volumes and impair efficient drainage operation.
More generally, the ribs can locally structure a plate, preferably the two plates, near the peripheral margin to prevent undesirable folding/bending of a plate while still allowing the protecting body to expand with filling of the pouch contained therein. The ribs thus may be ribs arranged to locally structure the covering part of the protecting body, for instance around a panel part which may be substantially rectangular or provided with a square shape.
A good compromise may be obtained between ease of the covering part at expanding transversally (vertically when the protecting body reference plane is horizontal), with suitable flexibility of the plates using, while also preventing fold formation neat the peripheral margin. The plates may be accordion-like, using several ribs arranged parallel to the respective four margin portions of the peripheral margin.
Accordion effect in a plate may be obtained by having parallel ribs, each of the parallel ribs locally having a thickness lower than in other portions of the plate. When a pouch filled with fluid constrains the interior faces of the plates (where the ribs define an elongated hollow or groove), the ribs may help for having a greater expansion in direction transverse (perpendicular) to the protecting body reference plane, despite low flexibility of the plate material as compared to plastic material of the pouch.
Each rib of the plate may be obtained by locally drawing the plastic material, thus causing a reduction in thickness at the ribs. This may be sufficiently deep drawing, in order to have the hollow or groove of each rib deeper than average thickness of the plate. Each of the ribs may have a flaring shape, typically forming a U-shape profile in a section view (section transverse to length direction of the rib).
Depth or height of the ribs may be at least twice or at least three times the thickness of the plate (plate material thickness), preferably at least four or height times. With such height and with slight decrease in thickness, the ribs located close to the peripheral margin efficiently improve expansion (with a higher shift relative to the protecting body reference plane) near the margin portions, as if the plate was locally more expandable. Even if the margin portions cannot expand, due to the attachment system, all or part of the peripheral annular region may expand/deviate from the protecting body reference plane quicker than if the plate was deprived from such ribs.
The grooves formed by the ribs are elongated, such grooves having a groove length corresponding either to length extension, or to width extension of the plate, which is a generally rectangular plate. The groove interior width may be superior to 10 mm, preferably superior or equal to 15 mm. In some embodiments, such width is between 20 and 40 mm. As apparent in
The region provided with the ribs may be an annular region formed as a transition region between a panel part without ribs and the peripheral margin that is typically not allowed to move transverse to the protecting body reference plane. Such transition region may form a homogenous sloped region in expanded/filled state of the system, as formation of undesirable waves/folds is prevented.
The peripheral margin is configured to remain flat along the protecting body reference plane in the assembled state, independently of a filling state of the flexible pouch covered by the covering part. Optionally, the attachment system may be a fastening assembly, two opposite sides (opposite margin portions) of the peripheral margin being part of the fastening assembly to prevent any shifting in position between the two plates once they are mutually fastened at least in the two margin portions, in a predetermined superimposed configuration for forming the protecting body.
The plates typically are separate pieces, preferably two pieces. The constraining effect is of interest for a step of emptying the flexible pouch, and is advantageous to limit vertical expansion of the fluid, especially during freezing, when the protecting body reference plane extends substantially horizontal.
The vertical expansion may be also limited by having a belt effect exerted in a middle region of the covering part, possibly by retaining the shrink stroke of the peripheral margin, selectively in margin middle portions located on both sides of this middle region.
In some embodiments, ribs of the plurality of ribs are distributed at least in two opposite parts of the surface which are longitudinally opposite parts.
Besides, the ribs of the plurality of ribs include one or more first transverse rib portions proximal or adjacent to the first end side and one or more second transverse rib portions proximal or adjacent to the second end side.
In various embodiments of the device, recourse may optionally also be had to one or more of the following dispositions:
the one or more first transverse rib portions include two first transverse ribs portions, while the one or more second transverse rib portions include two second transverse ribs portions.
the attachment between the plates is a removable attachment, allowing the plates to be fully separated.
the plates are removably fixed to each other by the attachment system distributed (selectively distributed) in the peripheral margin.
two opposite margin portions, provided longitudinally in the peripheral margin, are part of a fastening assembly to prevent any shifting in position between the two plates once they are mutually fastened at least in the two margin portions, in a predetermined superimposed configuration for forming the protecting body.
each of the two plates comprises embossments or boss portions, which define, in assembled state of the plates (to form the protecting body), several protecting body embossments protruding in a first direction perpendicular to the protection body reference plane, forming corresponding cavities opening in a second direction opposite to the first direction.
the embossments may be longitudinally distributed in the peripheral margin.
a number of the embossments provided in one of the two plates are engaged in a same number of the corresponding cavities provided in the other one of the two plates.
the two plates are two pieces.
the two plates may have a same thickness that is lower than 2 mm, each of the two plates having a density superior to 1.10 g/cm3 and being made of plastic material.
the two plates are made of same plastic material, preferably transparent or translucent.
the protecting body is made of a freeze resistant polyester or copolyester material that is not brittle at about 25° F. or −4° C.
the material of the protecting body is PET.
the material of the protecting body is TRITAN (i.e. a copolyester compound called TRITAN™, which is a transparent amorphous thermoplastic material, typically made by combining three monomers; some formulations of this material do not contain additives, while others contain about or less than 10% additives).
the material of the protecting body is an amorphous copolyester made by combining the following monomers: dimethyl terephthalate, 2.2,4,4-tetramethyl-1,3-cyclobutanediol, and 1.4-cyclohexanedimethanol.
the protecting body is directly engaged by positioning members that belong to the attachment device, in order to have a profile of shrink at the protecting body circumference, optionally with almost no reduction or less shrink due to direct engagements of the positioning members engaged in a middle region of the protecting body, at the margin portions.
the positioning members may be sliders or similar members housed in a guiding or covering part of a holding and retaining assembly, which may forms a stationary frame around a hollow space/location for the pouch.
each of the positioning members may have inserting pin or inserting member that is inserted either in a protecting body through-slot or in a hollow part delimited by a pair of respective embossments of the two plates (the slot or hollow part being provided in the peripheral margin, in order to not interfere with expansion of the covering part that covers the pouch).
the ribs of the plurality of ribs further include a group of elongated rib portions, extending in the peripheral annular region of the covering part.
the elongated ribs may be parallel to the longitudinal axis, thus extending perpendicular to any one of the first transverse rib portions and the second transverse rib portions.
the group of elongated rib portions may consist in longitudinal ribs and/or comprise two opposite elongated rib portions/ribs, which are longer than any one of the first transverse rib portions and the second transverse rib portions.
each plate is provided with a clearance area (which is an area without any relief/rib) provided between and/or separating longitudinal rib portions that are distributed in respective halves of the plate.
each plate has one or two pairs of elongated continuous rib portions, parallel to the longitudinal axis, which extend cross a middle section or middle transverse band of the plate.
the elongated continuous rib portions extend longitudinal to remain close, typically only at a distance of less than about 30 or 50 mm from a respective one of the two opposite margin portions of the rectangular peripheral margin, while the transverse distance between the two opposite margin portions is at least equal to 500 or 600 mm, preferably superior or equal to 700 mm, when the plate extends planar (when the plates are assembled to sandwich the pouch, this planar state is obtained for non-filled state of the pouch).
amongst each pair of elongated continuous rib portions, parallel to the longitudinal axis, which extend cross a middle section or middle transverse band of the plate, each elongated continuous ribs extends straight to remain close from a margin portion, at a distance less than 10% of the total plate width from this margin portion.
the plate has longitudinal rib portions of relatively shorter length, as compared to the elongated continuous rib portions, also called side rib portions, which are crossing over the middle section/middle transverse band, the longitudinal rib portions of relatively shorter length not interfering with the clearance area or not interfering with a plate middle area only provided with transverse rib portions.
the corner ribs comprise first corner ribs interconnecting one of elongated rib portions with one of the first transverse rib portions.
the corner ribs further comprise second corner ribs interconnecting one of elongated rib portions with one of the second transverse rib portions.
in the surface provided with the plurality of ribs, a continuous rectangular region without any ribs is surrounded by (and possibly delimited between) a first group of ribs extending annularly in the peripheral annular region of the covering part, and a second group of ribs extending parallel to the first group of ribs and arranged closer to the peripheral margin as compared to the first group.
the first group of ribs may extend annularly at a maximal distance from the peripheral margin, which is a first distance, while the second group of ribs may extend at a minimal distance from the peripheral margin, which is a second distance, the second distance being typically superior to the first distance.
In some embodiments, the protecting body may extend substantially horizontally and/or the first outer surface, which is delimited by the peripheral margin, is a lower surface of the protecting body, while the second outer surface, delimited by the peripheral margin, is an upper surface of the protecting body.
In particular embodiments, each of the lower surface and the upper surface comprises a pattern of ribs distributed in two halves, the first transverse rib portions being provided in a first half of the two halves, while the second transverse rib portions are provided in a second half of the two halves.
Optionally, the pattern of ribs in the lower surface and the pattern of ribs in the upper surface are symmetric relative to the protecting body reference plane, the two halves being preferably two symmetrical halves relative to a median plane that is perpendicular to the protecting body reference plane.
In some embodiments, the pattern of ribs is surrounding at least one smooth panel region extending away from the peripheral margin.
Around the panel, one or two continuous or discontinuous ribs of the pattern of ribs are configured to allow fluid (liquid) to be spread to the edges and corners. In embodiments, the ribbing pattern provides more flexibility to the protecting body edge regions to be deformed (regions adjacent to the four respective side edges) by forming sloped portions, parallel to the peripheral margin. Such rib delimiting the panel may be a continuous or discontinuous annular rib.
The longitudinal ribs, elongated, may propagate the hinge effect at junction (which may be a rectilinear junction) between the peripheral margin where the plates remain fixed in a plane and one long side amongst the four sides of the rectangular covering part.
The transverse ribs, typically also elongated, may propagate the deployment with hinge effect at junction (which may be a rectilinear junction) between the peripheral margin where the plates remain fixed in a plane and one short side amongst the four sides of the rectangular covering part.
In various embodiments of the device, recourse may optionally also be had to one or more of the following dispositions:
the protecting body is provided with ribs in the first outer surface and in the second outer surface, so that a first plurality of ribs is formed on the first outer surface and a second plurality of ribs is formed on the second outer surface.
the protecting body is configured to expand along a direction perpendicular to the body reference plane due to filling of the flexible pouch sandwiched between the two plates, so that the two mutually unfixed facing parts form respective panels, which are each: extending parallel to the protecting body reference plane, and surrounded by reliefs elongated to extend parallel to the peripheral margin.
the reliefs may be protruding outwardly and formed by a part of the ribs included in
each of the two plates comprises at least one plate panel part extending between the first transverse rib portions and the second transverse rib portions.
a single panel may be formed by each plate outer surface provided with ribs.
two panel portions, longitudinally distributed, may be formed by each plate outer surface provided with ribs.
each the two plates has at least one central portion arranged away from the two end sides.
one or two ribs may extend transversally to separate two panel parts in a same plate, such ribs typically extending transverse in such central portion.
each panel part is formed without any ribs or hinge lines.
in non-filled state of the pouch or in any flat state of the of the protecting device, each surface amongst the first and second outer surfaces is provided with height differences of 0.8 to 20 mm (and not protruding more),
the maximum height reliefs are provided on areas surrounding the one or two panel parts, while no height difference is found in the panel part(s).
In some embodiments, the protecting device may be provided with a holding and retaining assembly, separate from the attachment system, for supporting the protecting body at the peripheral margin, away from any one of the ribs of the protecting body. Typically, the holding and retaining assembly may comprise a frame with abutment surfaces arranged between the covering part and the peripheral margin, in order to allow the two plates moving, extending, and shrinking in a transverse direction belonging to the protecting body reference plane, without having the peripheral margin displaced inwardly beyond the abutment surfaces.
In various embodiments of the protecting device, recourse may optionally also be had to one or more of the following dispositions:
the peripheral margin is provided with positioning members spaced from any one of the ribs of the protecting body.
the positioning members are configured to limit movement in the transverse direction of at least one part of the peripheral margin, in order to limit expansion of the flexible pouch in at least one region that is intermediate between the first transverse rib portions and the second transverse rib portions.
the first transverse rib portions are typically proximal to the first end side and distal from the second end side, while the second transverse rib portions are proximal to the second end side and proximal form the second end side (preferably, the first transverse rib portions are not spaced from the corresponding first end side by a distance more than 15 or 25% of the total length of the plate, as measured along the longitudinal axis in the planar empty state; similarly, the second transverse rib portions may be not spaced from the corresponding second end side by a distance of more than 15 or 25% of the total length of the plate, as measured along the longitudinal axis in the planar empty state).
each of the first transverse rib portions and the second transverse rib portions extends perpendicular to the longitudinal axis and belong to an intermediate region between two corner regions respectively adjacent to an intersection of two of the four sides.
the two corner regions are formed to be elastically more deformable than the intermediate region provided with the first transverse rib portions and the intermediate region provided with the second transverse rib portions.
each intermediate region is adjacent to one amongst the first end side and the second end side.
each amongst the first outer surface and the second outer surface comprises longitudinal rib portions that extend parallel to the longitudinal axis in two opposite side regions, in order to be each proximal to the peripheral margin and distal to the longitudinal axis.
each of the corner regions are formed to be elastically more deformable than any one of the side regions provided with the longitudinal rib portions.
In some embodiments, each plate may be provided with several ribs protruding outwardly (i.e. protruding upwardly for the top plate, downwardly for the lower plate). The ribs which are closer to the peripheral margin (so-called side ribs) may be protruding more than any other rib present in the plate.
The maximum in height (protruding height) is obtained at the side ribs, while a minimum in rib height may optionally be obtained in the corner regions.
Each of the lower surface and the upper surface has a planar surface, while height of the rib portions or similar protruding portions protruding from the planar surface is large (for instance greater than 6 or 10 mm) only in regions away from two virtual diagonal lines provided in each plate that is rectangular in shape.
In some embodiments, the protecting body may be have:
the two plates made as two separate pieces, having same circumferential size and same outer shape, each of the first outer surface and the second outer surface comprising first transverse rib portions proximal to the first end side and second transverse rib portions proximal to the second end side.
the two plates may be two separate identical pieces.
the plurality of ribs and the protecting body are made of same freeze resistant polyester or copolyester material, the two plates being two separate pieces.
the plate material is not brittle at about 25° F. or −4° C., the material being preferably PET or TRITAN.
the two plates a made of deformable plastic more rigid than the flexible pouch and configured so that an interspace between the two plates, as measured perpendicularly to the protecting body reference plane in a filled state of the flexible pouch, increases with increasing distance from the peripheral margin.
the protecting body is expansible with corner regions less strengthened by the ribs.
each rib of the plurality of ribs delimits an interior hollow opening inwardly, in order to open toward the flexible pouch.
each rib of the plurality of ribs delimits an interior hollow separate from the peripheral margin so that the interior hollow provides additional volume in an interspace between the two plates.
each of two plates is a plate having a rectangular shape with four corners and two virtual diagonal lines each intersecting a pair of corner vertices of the four corners, and wherein each of the two virtual diagonal lines intersects: a first series of corner ribs proximal to the first end side and protruding outwardly along a direction perpendicular to the protecting body reference plane, and a second series of corner ribs proximal to the second end side and protruding outwardly along a direction perpendicular to the protecting body reference plane.
each of the corner ribs are curved and are connecting two rib portions that are perpendicular one to each other.
the first transverse rib portions may be directly connected to the corner ribs of the first series, while the second transverse rib portions may be directly connected to the corner ribs of the second series.
Embodiments of the invention also provide a freeze/thaw containment system for containing a biopharmaceutical composition, comprising:
the protecting device according to the invention,
a flexible pouch sandwiched between the two plates, the flexible pouch being fillable with a biopharmaceutical composition via at least one port of the flexible pouch which protrudes outwardly through the least one opening, the flexible pouch being more flexible than material of the protecting body.
In some embodiments, the two plates constrain the flexible pouch by a covering part that extends between two margin portions of the peripheral margin.
The system may be provided with a frame for attachment of the protecting device selectively at the peripheral margin. Accordingly, the frame allows having the covering part of the protecting body suspended, as only the peripheral margin is fixed to and retained by the frame. In some options, the frame is rectangular and does not cover the covering part. In other portions, all or part of the frame may be included in a protective shell provided with shell parts forming a housing for accommodating the covering part. Such protective shell preferably includes all or part of the attachment system, thus allowing the peripheral margin to be maintained in the protecting body reference plane that typically coincides with an interspace provided by the frame.
The frame may be provided with upper parts and lower parts in some embodiments, such parts being assembled to form the frame with the retaining feature relative to the peripheral margin. Positioning members may be either provided on the peripheral margin, or be included in the parts of the frame.
The freeze/thaw containment system (which is a protection system for storing and withstanding freezing and thawing of the biopharmaceutical composition contained in the flexible pouch) may be assembled using a method that comprises:
sandwiching a flexible pouch between two plates of a protecting body, selectively by a covering part distributed in the two plates for covering the flexible pouch, the protecting body being configured for protecting the flexible pouch and comprising the two plates, the protecting body further having a longitudinal axis and comprising four sides, the four sides comprising two longitudinal sides extending parallel to the longitudinal axis and two other sides that include a first end side and a second end side each perpendicular to the longitudinal axis,
fastening the two plates by an attachment device at a peripheral margin so that in an assembled state of the two plates, the protecting body has the peripheral margin which extends annularly in a protecting body reference plane, around the covering part,
inserting through the peripheral margin, in at least one opening, thereof, at least one port of the flexible pouch (which is thus received in such at least one opening);
maintaining the peripheral margin parallel to the protecting body reference plane, by a holding and retaining assembly accommodating the peripheral margin in an annular housing, so that the peripheral margin remains flat along the protecting body reference plane in the assembled state, independently of a filling state of the flexible pouch covered by the covering part;
wherein in the assembled state:
the two plates are configured to sandwich the flexible pouch for constraining the flexible pouch in a filled state of the flexible pouch; and
the two plates respectively form a first outer surface and an upper surface of the protecting body, at least one amongst these surfaces being a surface having a plurality of ribs which extend at least on a peripheral annular region of the covering part, along the peripheral margin, in order to locally structure the covering part of the protecting body.
The assembling may be easy and the ribs are provided to protrude outside, with these ribs distributed in two opposite parts of the surface which are longitudinally opposite parts.
The protecting body may be less ribbed or provided with low height reliefs in four corner regions of the protecting body, each corner region being respectively adjacent to an intersection of two of the four sides.
The flexible pouch is inflated when filling the flexible pouch with the biopharmaceutical composition in a fluid state, and the covering part is constraining the flexible pouch, while guided when expanded due to side ribs that prevent undesirable centripetal folds near the peripheral margin.
Other features and advantages of the invention will become apparent to those skilled in the art during the description which will follow, given by way of a non-limiting example, with reference to the appended drawings.
In the various figures, the same references are used to designate identical or similar elements.
In the different Figures, a vertical direction, a longitudinal direction and a lateral direction are based on the freeze/thaw containment system horizontally stored in a shelf. A direction perpendicular to the longitudinal direction is the lateral direction. One direction according to the height of the freeze/thaw containment system 1 is the vertical direction, reflected by direction Z in the
In embodiments, the freeze/thaw containment system 1 may be such as illustrated in
Thus, when the biopharmaceutical composition Q is frozen, the containing region or useful part of the flexible pouch 2, i.e. inner region relative to the peripheral seal J, may be slightly curved. Hence, a dimension on the longitudinal direction (along longitudinal axis X1) of the protecting body 12 slightly decreases. In this case, the biopharmaceutical composition is slightly constrained by the two plates 12A, 12B.
In accordance with embodiments, the plate dimension reduction (as considered in XY plane) is obtained with a profile of shrink strokes, such reduction being adjusted to be different, depending on longitudinal positions of some positioning members PM integral with margin portions of the protecting body that locally prevent or limit such dimension decrease, for a control of the shrink stroke, as it will be described below. Additionally or in variants, a ribbing is provided for controlling that the shrinkage is obtained without decreasing height on pouch sides or altering an optimal shape of the pouch 2.
Referring to
The protecting body 12, 112, 212 is obtained by fastening the two plates 12A, 12B in a circumferential part that surrounds a covering part 8 of the protecting body 12. For instance, the protecting body 12, 112, 212 is assembled when sandwiching the empty pouch 2 by the covering part 8, by securing the circumferential parts of the plates 12A and 12B together. For this, an attachment device or attachment system 18 is provided, in order to fasten the two plates 12A, 12B. In an assembled state of the two plates 12A, 12B, the protecting body 12, 112, 212 comprises a peripheral margin 80. The peripheral margin 80 is obtained by securing respective margin portions 8a, 8b of the plates. Each margin portion 8a, 8b may be composed of four outer band regions of the plates 12A and 12B.
The protecting body 12, 112, 212 extends planar, along a protecting body reference plane P, and cannot inflate like a thin rubber balloon, as the plates 12A, 12B are relatively rigid to constrain the pouch 2. The protecting body 12, 112, 212 may be typically as rigid as or more rigid than a PET bottle for containing sparkling water, thus allowing very limited deformation as compared to the material of the flexible pouch 2. In the plates 12A, 12B, ribs R1, R2, R2′,800 also structure the covering part 8 in a peripheral annular region 8p thereof, typically along the peripheral margin 80 to have a guiding effect when the protecting body 12 expands. The structuring is not impairing the expansion as only linear regions for local/linear strengthening are provided, so that plate deviation angle α as illustrated in
In the illustrated embodiment of
Ribs R3 and/or R4 may optionally be added, with a shift toward a middle region, as compared to the side ribs R1 or the ribs R, R2′. Accordingly, at least three transverse rib portions extending perpendicular to the longitudinal axis X1 of the protecting body 12 may be provided, at each opposite ends of the plate 12A and/or 12B.
Here in
When a belt effect is obtained as described below (referring to
The system 1 is suitable for containing, freezing/thawing a biopharmaceutical composition Q (see
The flexible pouch 2 is typically a 2D-type pouch, delimited by two longitudinal sides LS1, LS2 and having a substantially rectangular shape without predefined folds on its two main outer faces, as illustrated in
Referring to
Typically, the receiving part 2r of the containing pouch 2 for receiving the biopharmaceutical composition Q cannot be in contact with the rigid structures of the holding and retaining assembly HR, thanks to the protecting body 12, 112 or 212. In the assembled state, the protecting body 12, 112, 212 may entirely cover the receiving part 2r of the pouch 2, while the peripheral margin 80 remains planar (here always coinciding with the reference plane P, due to the attachment system 18).
The protecting device 10 provides efficient protection in freezing, storing and thawing operations, while the biopharmaceutical composition Q is contained in the receiving part 2r of the flexible pouch 2. The covering portion 8 of the protecting body 12 is not as flexible as the receiving part 2r of the flexible pouch 2, due to a difference in material (more rigid for the two pieces forming the plates 12A, 12B).
When placed horizontally and maintained by the holding and retaining assembly HR, the two plates 12A, 12B respectively form a lower surface and an upper surface of the protecting body 12, 112, 212.
Each pouch 2 may be filled with a solution, fluid composition, to be frozen and held with slight compression between the two plates 12A, 12B that serve as heat-exchange surfaces. For this purpose, the plates completely cover the pouch 2, at least in the fluid receiving part, i.e. region defining the interior volume of the pouch 2 (i.e. typically all the walls W1, W2 with possible exception of the annular seal J and optional outer extension(s)). In the illustrated embodiments, the pouch 2 is entirely covered by a protecting body 12, 112 which is formed by the two plates 12A, 12B. During freeze/thaw operations, the plates 12A, 12B are cooled/heated by circulating heat transfer fluid, for instance from an external, programmable refrigeration unit. The slight compression (containment effect) provides improved contact and heat transfer, resulting in a frozen pouch having the general shape of a pillow (see
Arrangement for Maintaining and Guiding the Protecting Body
The pouch 2, sandwiched between the plates 12A, 12B may be supported by a structure surrounding the pouch. Such structure may include a frame 15 or similar holding and retaining device HR, arranged peripherally around the covering part 8, so as not to damage the material inside during handling and transport. Referring to
The frame 15 may be included in a holding and retaining assembly HR, which also includes positioning members PM engaged in the peripheral margin 80 of the protecting body 12, as illustrated in
More generally, the protecting body 12 and the holding and retaining assembly HR may be assembled in such a way that outer surfaces S, S′ (here corresponding to the lower surface S′ of the lower plate 12A and the upper surface S of the upper plate 12B) remain exposed (uncovered), while the flexible pouch 2 is placed inside the storage assembly, the pouch 2 being covered by the two plates 12A, 12B. A shown in particular in
The freeze/thaw containment system 1 is provided with several positioning members PM that are secured to or formed on this peripheral margin 80. This peripheral margin 80 may be seen as the part of the protecting body which is complementary to a covering part 8 where the pouch conformation changes, depending on the level of filling of the pouch 2. The system 1 also comprises a frame 15 that is constructed to surround a hollow space where the pouch 2 extends. The frame 15 may be provided with two longitudinal supporting parts that are separate from the positioning members PM.
It is understood that interface Frame—Protecting body is shifted relative to the covering part 8, thus not interfering with the expansion along Z-direction. Besides, ribs of plates 12A, 12B can be formed away from the arrangement provided for maintaining the protecting body 12, 112, since only the peripheral margin 80 is include or in contact with the positioning members PM.
Referring to
The positioning members PM are configured to protrude each from at least one amongst a lower surface S′ and an upper surface S of the protecting body 12, 112, 212, in the peripheral margin 80. Typically, the positioning members PM comprise each a lower part LP and an upper part UP that are two separate flat bars or any suitable pair of pieces configured to sandwich the protecting body, in a region of the peripheral margin 80, outside the hollow space of the frame 15 where the pouch 2 extends.
Referring to
In the system shown in
Use of four rigid profiles is here illustrated in
In some options the holding and retaining assembly HR may have less than four members, so as not to form a rectangular frame. For instance, only three members may be sufficient, with a transverse member interconnecting two longitudinal covering parts 31, 32 parallel to the longitudinal axis A of the pouch 2.
When the positioning members PM are part of the attachment system 18, the attachment system 18 can be considered as an assembly of several displaceable parts that can move inwardly relative to the frame 15. Here, the frame 15 comprise two elongated longitudinal supporting parts formed by two pieces or profiles 93, 94, that define each a housing for accommodating respective positioning members PM. At least one of the positioning members PM constitutes a slider movable inwardly inside the corresponding housing. Referring to
Referring to
More generally, it is understood that the frame 15 typically comprises abutment surfaces included and distributed in the two longitudinal supporting parts, all or part of the positioning members PM connecting the peripheral margin 80 to the frame 15 so that the frame 15 retains and supports:
the protecting body 12, 112, 212; and
the pouch 2 that is sandwiched between the two plates 12A, 12B.
Some or all of the positioning members PM may constitute sliders, which are slidably mounted on or in the two longitudinal supporting parts, in order to be movable along a direction transverse to the longitudinal axis X1 (see
a first position, in a non-filled-state of the pouch 2, in which the sliders are pushed outwardly or maintained away from the surfaces BS1, BS2 for abutment, by the protecting body 12, 112, 212 (when having its flat rectangular shape with a maximal perimeter), so that the sliders are able to be further displaced inwardly,
and a second position, in a filled-state of the pouch 2, in which the sliders are each engaged against one of the surfaces BS1, BS2 for abutment.
In some options, positioning members PM may form guiding parts for receiving one or more body crossing members, screws or the like. Referring to
Pouch Properties and Access for Filling or Emptying the Pouch
Referring to
In the illustrated embodiments, the protecting body 12, 112 preferably has an attachment system 18 for fastening the two plates 12A, 12B so that in an assembled state of the two plates, the protecting body 12, 112, 212 comprises a peripheral margin 80 that extends annularly in a protecting body reference plane P.
As shown in
a first end side 120a, which is composed of the ends E1 of the two plates in the assembled state of the protecting body 12, 112, and
a second end side 120b, which is composed of the ends E2 of the two plates in the assembled state of the protecting body 12, 112.
The one or more ports 24 may protrude axially outward from the second end side 120b. This arrangement with an opening 80a may be provided in any other version of the protecting body, in order to accommodate a flexible pouch 2 having one or more ports 24 (with flexible hose(s)).
Tubes T may be associated to the ports 24. Here, each of the tubes T is connected to the flexible pouch 2 by a port 24. Two front ports 24 may be provided. For example, one port 24 forms an inlet for the flexible pouch 2 and the other port 24 forms an outlet of the flexible pouch 2.
The pouch 2 is also designed to provide a high surface area/volume ratio at a thin thickness or spacing. By way of non-limiting example, a pouch 2 may have rectangular dimensions of about 600 mm by about 1300 or 1400 mm, and/or a holding volume of between about 10 liters and about 120 or 200 liters (preferably between 50 and 120 liters), and/or a spacing or pouch thickness (height along Z direction) of between about 8 or 10 mm to about 25 or 30 mm.
Each pouch 2 may be made from any suitable biologically compatible material, and which preferably facilitates heat transfer between the inside and the outside of the pouch 2. To reduce or avoid damage to the pouch 2 during cryopreservation due to the expansion of the biopharmaceutical material, it is preferred that the material would have a glass transition temperature that is below that of the biopharmaceutical material. By way of non-limiting example, each pouch 2 may be made from a multilayer composite material only made of thermoplastic material, for instance including polyethylene.
Tubing Holder
Referring to
The assembly 22 for holding the two tubes 16 is symmetrically arranged with respect to the longitudinal direction X (i.e. pouch longitudinal axis A which typically coincides with axis X1). Each symmetrical part is able to hold one tube T or hose.
In other options, especially suitable for accommodating pouches of high capacity (for example between 30 or 50 liters and 200 liters), the frame 15 may directly support at least one bracket or similar holding member, as illustrated in
Referring to
Each hose/tube T is provided with a connector 17 for fluid connection, typically a connection to another biopharmaceutical device. The connector 17 thus makes it possible to fluidly connect the flexible pouch 2 to another element, for example a tank. In storage position of the tube (s) by use of the fixation means MF1, MF2, each connector 17 may be located between the longitudinal rear side 120b of the protecting body 12 and the middle region MR.
Referring to
Referring to
The bracket may be resiliently deformable, allowing removal of the fixing element relative to the frame 15, for instance by spacing the arms of the bracket further away. Accordingly, the tubing holder formed by the fixation means MF1, MF2 may be removed once line is no more used (inlet line not useful anymore after filling line disconnected).
Referring to
The more the flexible tube T is away from the periphery of the system 1, the lower is risk for accidentally handling and disconnecting this hose or tube T, during transportation steps for instance. But, this tube T remains here easily available for operators.
The tubing holder may be an assembly for holding two tubes T, in order to be symmetrically arranged with respect to the longitudinal direction X (i.e. pouch longitudinal axis A). Each symmetrical part is able to hold one hose/tube T.
While
Protecting Body
Referring to
The protecting body 12 comprises two substantially planar plates 12A, 12B that are each made of a single thermoformed plastic piece. The planar plates 12A, 12B extend also in a plane parallel to the main plane XY (here parallel to the protecting body reference plane P). The plate 12A forms a lower surface S′ and the plate 12B forms an upper surface S, with respect to the vertical axis Z. In preferred embodiments, the two plates 12A, 12B are identical and symmetrically face each other, with respect to the main plane XY.
The protecting body is a thin body, as the plates 12A, 12B may be compared to sheets of relatively low flexibility, the plates being made of same material. The thickness e of each plates 12A, 12B is lower than a minimal thickness of the positioning members PM. The plates 12A, 12B can have a general curvature but cannot easily folding (flexibility being substantially as low as PET).
While the illustrated embodiments show a protecting body 12, 112, 212 covering entirely the two main walls W1, W2 by the covering part 8, other size may be used for the covering part 8. For instance, the protecting body 12 could only cover a transverse band portion of each wall W1, W2, at a distance from the pouch edges 2A, 2B. Besides, one or more complementary protecting bodies could be used to cover at least one of the end parts of the walls W1, W2.
Referring to
Optionally, the attachment system 18 may comprise a plurality of snap buttons 20A, 20B. One of the two plates 12A, 12B comprises a first element 20A of one snap button and the other plate comprises a second complementary element 20B of one snap button. The second element 20B (possibly a male element) engages the first element 20A (possibly a female element) in a direction parallel to the vertical axis Z. Insertion pieces IP, for instance with screws or bolts may also be used, by crossing the peripheral margin at specific holes or slots S80 (see
Alternatively, the attachment system 18 is a non-removable system, which means that, once the two plates 12A, 12B are fixed to each other, it is not possible anymore to detach the two plates 12A, 12B one from each other. Clips may be used for such non-removable fixation.
In the non-limiting embodiment of
As can be seen in
Exemplary Ribbing Patterns
In each plate 12A, 12B, a group of ribs is provided with ribs R1, R2, R2′,800 arranged close to the peripheral margin 80. An optional other group of ribs may be provided with ribs R3, R4, 83, 84, 85, 86 arranged at a greater distance from the peripheral margin 80. Such ribs R3, R4, 83, 84, 85, 86, which can be considered as ribs of a first group, may surround one or two panel portions PP, PP1, PP2, which are typically forming rectangular panels, in each outer surface S, S′ of the protecting body 12, 112.
Referring to
ribs (front ribs) close to a front side provided with the opening for the one or more ports 24,
and ribs (rear ribs) arranged at the opposite from the front side.
Each panel portion may be strictly planar before assembling, possibly except at few local projections, here except at two projections 12p, which can be protruding (outwardly) in same direction as the ribs. The projections 12p can be used to support a temperature sensor. These projections 12p may be median projections, intersected by a median plane of the protecting body 12 which extends along Z direction, parallel to a width of the protecting body 12. The projections 12p may be disposed at the rear of any one of the front ribs and at the front of any one of the rear ribs.
More generally, the ribs may be distributed in groups, a first group of which having ribs R3, R4, 83, 84, 85, 86 extending annularly (possibly with square or rectangle shape with curved corners), typically in the peripheral annular region 8p of the covering part 8 as they are outside any panel part PP or PP1, PP2, while a second group of ribs has ribs R1, R2, R2′,800 extending parallel to the first group of ribs and arranged closer to the peripheral margin 80 as compared to the first group.
Here, it is seen that several transverse ribs portions may be provided, separating the short margin portion of the peripheral margin 80 from one of the panel part (panel PP1 or PP2). At least six or eight transverse ribs thus may be provided and distributed at two opposite ends of each plate 12A or 12B. Referring to
In the illustrated embodiments, the protecting body 12, 112, 212 preferably has an attachment device/system 18 for fastening the two plates 12A, 12B so that in an assembled state of the two plates, the protecting body 12, 112 comprises a peripheral margin 80 that extends annularly in a protecting body reference plane P as illustrated in
The protecting body may be provided with:
a first end side 120a, which is composed of the ends E1 of the two plates 12A, 12B in the assembled state of the protecting body 12, 112, 212, and
a second end side 120b, which is composed of the ends E2 of the two plates in the assembled state of the protecting body 12, 112.
The one or more ports 24 may protrude axially outward from the second end side 120b. Here a part of the pouch front edge is thus accessible.
In empty state of the pouch 2, the two plates 12A, 12B respectively form a first surface S′ and a second surface S of the protecting body 12, 112 covering the pouch 2. When having a substantially horizontal configuration, the first surface is a lower surface and the second surface is an upper surface. The fastening members 146, 147, 148 can be provided on one of these surfaces S, S′ near an end side chosen amongst the first end side 120a and the second end side 120b.
At least one amongst the lower surface S′ and the upper surface S may be a surface having a plurality of ribs distributed in two opposite parts of the surface, which are longitudinally opposite parts. Preferably, the ribs of this plurality include first transverse rib portions 4 proximal to the first end side 120a and second transverse rib portions 6 proximal to the second end side 120b.
More generally, such transverse rib portions 4, 6 or RP1, RP2 provide an accordion effect due to width of the corresponding grooves G1, G2 formed by the ribs and/or height of the ribs (depth of the grooves G1, G2). This facilitates local expansion of the plates 12A, 12B despite the planar structure of the peripheral margin 80 forming the protecting body reference plane P. Typically, in corner regions CR, the first and second transverse rib portions 4, 6 have a height decreasing with decreasing space from the corner vertices of the plate having such rib portions 4, 6. Accordingly, too great expansion that could create undesirable folds (along diagonal lines) may be limited or prevented when having height reduction for the corner rib portions, extending in the corner regions CR. In other words, accordion effect may be practically reduced in the four corner regions CR in each plate 12A, 12B. More generally, structuring of the plates 12A, 12B, using first and second transverse rib portions 4, 6, is helpful, in order to facilitate spreading of fluid toward the margin 80 and toward the corners of the protecting body 12, 112 when filling the flexible pouch 2 sandwiched between the plates 12A and 12B.
This is of interest, in order to have or improve a belly retention effect. Indeed, the more the fluid can be distributed toward the four corners, the less bulged is the pouch 2 in a middle region. The protecting body 12, 112 is typically able to move in interspaces of the holding and retaining assembly HR, as described in more detail below. Besides, the structuring effect of the ribs may prevent folding lines to form substantially along the diagonals DL1, DL2, when difference in thickness/expansion between the middle region including the center C of the protecting body and the covering portion edges is too pronounced.
Some detailed embodiments of a protecting body 12 or 112 provided with a ribbing pattern will be described hereinafter.
The plates 12A, 12B as illustrated in
Thanks to the ribs R1 and R2, R2′, a pair of transverse rib portions 4, 6, here parallel to Y-axis direction (perpendicular to the longitudinal axis X1) may be arranged close to the respective end sides 120a, 120b. In other words, these ribs form the first transverse rib portions 4 proximal to the first end side 120a and the second transverse rib portions 6 proximal to the second end side 120b.
Referring to
a first series of corner ribs C1, C2 proximal to the first end side 120a and protruding outwardly along a direction perpendicular to the protecting body reference plane P, and
a second series of corner ribs C1, C2′ proximal to the second end side 120b and protruding outwardly along a direction perpendicular to the protecting body reference plane P.
Each of the corner ribs C1, C2, C1′, C2′ is curved and connects two rib portions that are perpendicular one to each other. Here the annular rib R1 thus may include two pair of corner ribs C1, respectively C1′.
It can also be seen that the ribs may be provided with differences in height so that they protrude more or less outside. For instance, the transverse rib portions 4, 6 included in the ribs of annular shape or U-shape R1, R2, R2′,800 may be of increasing height (maximal height) with the decreasing distance to the peripheral margin 80. Typically, the ribs very close to the peripheral margin 80 may have a progressive rounding (with greater radius of curvature) in their profile as viewed in cross section of the rib. Such ribs close to the peripheral margin 80 may also prevent waves or radial folds along angled/diagonal directions to be created in the plates 12A, 12B.
As such rib height may relatively great near the junction with the peripheral margin (thus locally allowing a greater slope effect), other ribs of lower height (possibly more rigid) may be provided around the panel PP, PP1 or PP2, to have expansion of the plates 12A, 12B that remain substantially parallel to the protecting body reference plane P.
Besides, as the pair of U-shaped ribs R2, R2′ are separated, the same applying for the optional ribs 800, also U-shaped, there is no additional rib in the middle region MR at equal distance from the front and rear ends E1, E2. Avoiding multiple longitudinal ribs in the middle/edges of the protecting body 12 is here preferred as having too many or too significant/pronounced ribs could cancel benefits of a belt effect made by stoppers 41 such as illustrated in
Referring to
In corner regions CR, the height may be significantly lower than in the transverse rib portions 4, 6 formed by the ribs R1, R2, R2′,800, which may be of interests for not impairing integrity of the plates. Besides, having here lower height in the ribs may allow having a transition as smooth as possible between elongated sloped portions SP formed along the long sides of the peripheral margin 80 and the elongated transverse sloped portions SP′ formed along the short sides of the peripheral margin 80.
It can also be seen that the ribs are provided in the thin regions of the protecting body once the pouch 2 has been filed, so that these ribs R1, R2, R2′,800 extend perpendicular to the slope considered along Z direction. With such orientation, the parallel ribs can expand in accordion manner, with provision that the pouch 2 is filled at a sufficient level (for example filled more than 60% or 70% of the full capacity) as the content should provide sufficient internal pressure to push the ribs from inside.
Referring to
It thus shows that the arrangement of the ribs is of interest to delay/relatively reduce the increase in stretching, which causes higher filling at the panel part PP and lower filing outside the panel part PP.
Referring to
The ribs R1, R2, R2′, R3, R4 may each be delimited by straight edges, in order to define respective virtual rectangles. Besides, the ribs R1, R2, R2′, R3, R4 may extend around a panel part PP of the plate 12A, 12B, with such panel part PP having a transverse size TL which is equal or superior to half the width T12 (transverse size) of the plate 12A, 12B, as illustrated for example in
Here, the length LL (longitudinal size) of the panel PP is also much greater than half the total length of the plate 12A, 12B. When having two panels PP1, PP2, cumulated longitudinal size of the two panels PP1, PP2 may also be superior or equal to the total length of the plate 12A, 12B. More generally, it is of interest to have cumulated panel length(s) exceeding half of the plate length.
Still referring to
In some embodiments, all or part of the longitudinal rib portions are removed and only transverse rib portions 4, 6, RP1, RP2 are present in at least one of the plates 12A, 12B. These transverse rib portions 4, 6, RP1, RP2 are already efficient to have more liquid stored in the two opposite ends adjacent to the short margin portions of the peripheral margin 80. The more liquid can be stored near the corners and the short sides, the lower is the thickness of the protecting body 12, 112.
The following table shows impact for the size along Z direction, when using some ribbing patterns in the plates 12A, 12B, each time with same belt effect using a configuration of positioning members PM such as in
It can be seen that the U-shaped ribs (here ribs R2, R2′ and R3, R4) are especially efficient at the end of the filling, when the pouch 2 sandwiched by the plates 12A, 12B is filled at more than 75%. For this reason, the minimum size along Z direction is obtained with this ribbing pattern. In similar embodiments, less U-shaped rib portions may be used, as illustrated in
Regarding situation with a pouch filled at lower level, for instance about 70 or 75% or less, the ribs such as shown in
When analyzing the bulge effect such as shown in
A high part of the biopharmaceutical product mass is concentrated in the middle of the covering part 8, even if the pouch 2 is filled only at 75% of its full capacity. Here, the plates of the protecting body 212 are not submitted to any belt effect on the one hand, and there is no ribbing for helping in having narrower sloped portions and/or homogeneous slope (without interfering folds) on the other hand. The solution illustrated in
Referring to
The rib portions 114, forming middle ribs in this embodiment, may be suitable to obtain a kind of “camel back” shape, once the pouch 2 is in a filled state. Some simulations have been performed to confirm this is efficient to limit total thickness of the protecting body, for pouches filled with 75 or 100 liters of liquid biopharmaceutical composition Q. Practically, the ribs of this pattern have a kind of molding effect so as to get two small off-center bellies rather than a greater mass of product in the middle section MS.
Transverse rib portions RP1, RP2 mays also be formed at opposite ends of the cover part 8, these rib portions possibly being interconnected to the longitudinal rib portions 110 by smaller corner ribs C1 provided in the corner region CR. In some options, no corner rib is present. Referring to
Now referring to
In the illustrated embodiments, each of the two virtual diagonal lines DL1, DL2 may intersect: a first series of corner ribs proximal to the first end side E1, and a second series of corner ribs proximal to the second end side E2 and protruding outwardly. Each of the corner ribs are curved and are connecting two rib portions that are perpendicular one to each other. Typically, the first transverse rib portions 4 are directly connected to the corner ribs of the first series, while the second transverse rib portions 6 are directly connected to the corner ribs of the second series.
Besides, the first transverse rib portions 4 and the second transverse rib portions 6 may extend perpendicular to the longitudinal axis X1 and belong to an intermediate region between two corner regions CR respectively adjacent to an intersection of two of the four sides. Preferably, each corner region is elastically more deformable than such intermediate region provided with transverse rib portions. Typically, each of the corner regions are more deformable than any one of the side regions provided with longitudinal rib portions 110.
A symmetrical ribbing may be preferred. For instance, ribs in the lower surface S′ is distributed in two halves of the plate forming the lower surface S′, and/or the pattern of ribs in the upper surface S is distributed in two halves of the plate forming the upper surface S. While same ribbing pattern is provided in the two complementary plates 12A, 12B according to the illustrated drawings, some differences may be provided in variants. Optionally, one of the plates may be deprived of ribs.
The plates 12A, 12B form each a stiffening layer when overlapping, and preferably entirely covering, the main walls W1, W2. The thickness e of each plate 12A, 12B before Thermoforming may be of about 1.27 mm and thus may be lower than 2 mm, with provision that the plastic material of the plates has a density superior to 1.10 g/cm3, preferably superior to 1.15 g/cm3 (typically without being above 1.5 or 1.6 g/cm3). Plate material may have a tensile strength at break, which is typically between 45 and 75 MPa, for example in the range 50-60 MPa, typically 52-59 MPA (standard test ASTM D638). Plate material may have a tensile strength at break between 45 and 60 MPA and a Young's Modulus comprised between 1250 and 1550 MPa, both along transverse direction (TD) and machine direction (MD).
Shrink Management
The flexible pouch 2 can inflate during filling operation, which means that the circumference of two main walls W1, W2 as considered in the pouch plane is decreasing due to inward movement, also known as shrink stroke, of the different sides. Here, in horizontal configuration of the system 1 as illustrated in
The holding and retaining assembly HR, which may include a rectangular frame 15 or at least two longitudinal covering parts 31, 32, is arranged to maintain two longitudinal margin portions of the peripheral margin 80, and allowing the two plates 112A, 112B moving, extending, and shrinking in a transverse direction belonging to the protecting body reference plane P. The two longitudinal covering parts 31, 32 may comprise two profiles 93, 94 each delimiting an interior cavity CP. In non-limiting embodiments, the interspaces may be respective interior cavities CP of such covering parts. Each of the two longitudinal covering parts 31, 32 may include a profile having a C-shape to delimit one of the interior cavities CP.
Now referring to
The positioning members PM may be adapted to cover the boss portions B12, B12′ such as illustrated in
Typically, the frame 15 may house the margin portions 8a, 8b sandwiched by a plurality of discontinuous positioning members PM. Along Z direction (see
Here, the frame 15 is provided with abutment surfaces BS1, BS2 included in abutment members or rims. Each abutment members may delimit an inner access to a housing, in which the positioning members PM extend. Typically, each profile 91, 92, 93, 94, forming a side of the frame 15 may be provided with an open end suitable for introduction of a respective side of the protecting body 12, 112, 212 inside the housing (side chosen amongst the four sides). The inner open sides of the frame 15 are not used for assembling or disassembling steps, due to presence of the abutment members that prevent any possibility for the positioning members PM to be inserted inside or extracted outside the profiles 91, 92, 93, 94 through the inner open sides. Indeed, at an inner face of each profile 91, 92, 93, 94, there is at least one abutment member BS1, BS2 extending transversely relative to the protecting body reference plane P. Here, each profile 91, 92, 93, 94 has a C-shape section, with the opening of the inner open side delimited between two vertically spaced abutment members. Each abutment member is here a continuous member elongated along length of the corresponding profile. But in variants, the abutment members may be divided into separated abutment regions or constructed in any suitable manner, without interfering with the protecting body reference plane P.
Here, as illustrated in
Referring to
Here, it can be seen that the sliders may comprise:
first sliders fitted in at least one cavity CP delimited by the first housing; and
second sliders fitted in at least one cavity CP delimited by the second housing.
Referring to
Referring to
In the illustrated embodiments, all or part of the positioning members PM are configured to slide and thus form sliders able to be displaced inwardly with increasing filling level of the pouch 2, as illustrated in
Typically, width of each groove G1, G2, G may be superior to 10 or 12 mm, preferably inferior or equal to 35 or 40 mm. In embodiments, any of the ribs formed along X or Y direction may have a width superior to 10 or 12 mm, while forming an elongated hollow/groove having an interior width of at least 10 mm.
Referring to
The frame 15 has here a rectangular shape thanks to the two longitudinal supporting parts and the transverse supporting parts. It is thus understood that the frame 15 can comprise abutment surfaces BS1, BS2 included and distributed in the two longitudinal supporting parts and in at least one of the transverse supporting parts.
The positioning members PM, forming sliders in the frame 15 and assembled such as shown in
Details of Exemplary Embodiments for Controlling Pouch Expansion
In embodiment of
Here, the positioning members PM (which are secured to the peripheral margin 80 as illustrated in
All or parts of the positioning members PM are stoppers for providing strokes limitation between the stoppers 41, 41′ 42 and the abutment surfaces BS1, BS2 included in the frame 15 of the holding and retaining assembly HR. Referring to
The positioning members may act as stoppers 41 or 41′ only in the two intermediate parts 82 of the protecting body 12. As a result, since stroke is allowed in regions closer to the corner regions CR, here in the end parts 81, the pouch 2 covered by the containment protecting body 12, 112 or 212 cannot form a single belly or bulge in the middle thereof.
Moreover, the optional ribs R1, R2, R2′, R3, R4 prevent the plate outer surface S, S′ from forming fold lines or hollows that limit good filling of the biopharmaceutical composition Q in the corner region. Such ribs, possibly with regions or portions of lower height (for instance only at the diagonal lines DL1, DL2 as guiding and accordion-like effect is already obtained along the four sides of the rectangular shaped protecting body 12, 112), may help in expanding the protecting body 12, 112 from the inside without creating hollows or inappropriate fold lines detrimental to filling at the corner regions CR.
It is understood that at a given level of filling, the pouch corners and protecting body corners can continue to move inwardly during filling operation, while the intermediate parts 82 are blocked by the stoppers 41, 41′. At the corner regions CR, shrink strokes are longer than in the middle and will allow storing at least the same liquid capacity than without the belly/bulge retention.
Still referring to
During filling operation, as the stoppers 41, 41′ provided in intermediate parts 82 of the longitudinal margin portions 8a, 8b are (initially) shifted inwardly due to arrangement of the attachment system 18, and because the abutment surfaces BS1, BS2 are in alignment, parallel to the X direction, these stopper 41, 41′ are in abutment state against the abutment surfaces AB1, AB2 well before the stoppers 42 adjacent to/facing a corresponding corner region CR. A belly retention effect at the middle of the protecting body 12, 112 is obtained.
In options, ribs R1, R2, R2′ R3, R4 are provided in the plates 12A, 12B. In such kind of option, the retention effect (decreasing bulge effect in the middle region MR, near the center C) is completed by a regular expansion of the regions around the panels PP or PP1, PP2, preventing undesirable formation of pronounced fold lines. Possibly, some corner ribs or rib portions C1, C2 have a decreasing height profile toward the intersection region with the diagonals DL1, DL2.
Of course,
The one or more bulges/bellies B1, B2 as illustrated in
More generally, any configuration with positioning members PM able to form stoppers away from the corner regions CR may be provided, so that a higher constraining effect can be obtained in a center of the pouch 2, as illustrated in
Dashed lines in
the pouch 2 in width (with w′<w, where w′ is the pouch width in filled state, as compared to pouch width w in empty state), and
the pouch 2 in length (with L′<L, where L′ is the pouch length in filled state, as compared to pouch length L in empty state).
In some variants, the positing members PM may be positioned in through slots and maintained stationary, for instance by being secured to or integral with the rigid frame 15 or similar holding and retaining assembly. The slots in the protecting body may be of greater size only near the end sides 120a, 120b, thus allowing greater shrinking only at the corner regions CR and preventing forming a too great bulge near the center C (due to belly effect/retention in the intermediate parts where the positioning members are early stopping members).
The holding and retaining assembly HR may comprise at least three positioning members PM distributed on each of the longitudinal sides 120c, 120d, with typically one or two central stoppers 41 corresponding to the positioning members PM arranged away from the corner regions CR.
Referring to
The flexible pouches 2 can be frozen, thawed, filled or emptied simultaneously when they are stored on stacked protecting bodies 12, 112, using the frames 15. When the flexible pouches 2 are stored, the biopharmaceutical fluid can be frozen or thawed. When the flexible pouches 2 are shipped, most often, the biopharmaceutical fluid is thawed even if the biopharmaceutical fluid can as well be frozen.
Now referring to
As illustrated in
The plates 12A, 12B here have same thickness e, as illustrated in
Length of the two opposite margin portions 8a, 8b is here substantially the same. Such length may be for example superior to 250 or preferably superior to 350 mm, which of interest to provide at least three through-slots regularly distributed in at least one margin portion, preferably in all of these margin portions 8a, 8b, while having excellent robustness. This length may correspond to more than 75% of the total length of the pouch 2, before filling the pouch 2.
The freeze/thaw system 1 may be optionally provided with clamps, here two clamps 11, 13 in the example of
With such arrangement, the frame or similar holding assembly HR may possibly only support the two margin portions 8a, 8b. The frame structure may be particularly simple when the capacity of the pouch 2 is lower than 10 or 20 liters.
Independently of the way the positioning members PM are provided in the peripheral margin 80, the protecting body 12, 112, 212 mounted to sandwich the flexible pouch 2 may be received in a single cavity of interior space of any suitable holding and retaining device HR, which is rigid and delimits an outer circumference of the system 1. Depending on level of filling of the pouch 2 sandwiched by the plates 12A, 12B, the protecting body 12 may comprise one or more areas with ribbing.
In order to accommodate the corresponding thickness variation (as measured on corresponding outer surface S or S′, from the protecting body reference plane along Z axis-direction), the holding and retaining device may be of annular shape without covering the covering part 8. The one or more bulges/bellies B, B1, B2 can be formed due to the expansion control and early stopping effect at the intermediate parts 82, so that the middle section MS illustrated in
The system 1 is well adapted for freezing, storing and thawing biopharmaceutical materials contained in a flexible pouch 2 of simple conception. A protecting device 10 as above described is of interest for filing the pouch 2 with a controlled and restricted expansion, so that expansion is restricted in one or more areas where the fluid thickness would reach a maximum if no expansion control is carried. The interior volume or cavity delimited by the main walls W1, W2 is expanded with prevention of free expansion in the middle areas of these walls W1, W2. Especially expansion can be limited along one or more belt line BL that joins the two intermediate parts 82, as illustrated in
Depression along such belt line BL, due to the low or inexistent shrink stroke in the intermediate parts 82, typically creates at least one recess. In the pouch 2 as filled and in containment configuration of the storage unit 10, at least one recess is thus created in the filled pouch 2 between the two bulges B1, B2 that are formed respectively in front of and at rear of the belt line BL (line crossing the at least one recess). Of course, such effect does not prevent fluid communication between the two opposite regions where a bulge B1 or B2 is formed. This allows a generally equal distribution of fluid. As more than one region is created with bulge formation, a more uniform thickness distribution is obtained, without decreasing the capacity of the pouch 2. In other words, the decreased thickness of each region decreases the thickness at any one point in the pouch 2, and thus no “belly” is formed.
The ribbing also facilitates having the belt effect without undesirable waves or folds which impair filling in the corner region CR.
The pouch 2 and the storage unit 10 may be exposed to a temperature of about −70° C. or lower to freeze the biopharmaceutical fluid. The annular shape of the shell HR is of interest to provide a recessed area where cold air can circulate and flow between systems 1 (even if they are staked). But other shapes and structures may be used to form a holding and retaining device for a controlled expansion, in order to eliminate or reduce the formation of too significant projections during freezing. In some options with a shell covering/contacting the covering part 8, this also facilitates separation of the halves or protecting parts 3, 4 of the shell HR.
The present invention has been described in connection with the preferred embodiments. These embodiments, however, are merely for example and the invention is not restricted thereto.
Of course, the pouches 2 of the present invention are not in any way limited to pouches having four sides and/or pouches that are larger than wide. The pouches 2 may have other shapes provided with two generally parallel sides, covered by the pair of plates 12A, 12B or similar protecting body including two flat portions.
In preferred embodiments as illustrated, the positioning members PM are sliding members inserted in slots or holes of the peripheral margin 80 or through-slots 25. In variants, the protecting body through-slots may be replaced by at least one cavity or hollow included in the respective plates, for receiving a positioning member PM that prevent inward movement, locally in a margin portion 8a or 8b.
Variation of the clearance for the shrink stroke may be obtained by abutting members included in a shell or covering parts that are differently positioned relative to the through-holes 25, as in
It will be understood by those skilled in the art that other variations and modifications can easily be made within the scope of the invention as defined by the appended claims, thus it is only intended that the present invention be limited by the following claims.
Any reference sign in the following claims should not be construed as limiting the claim. It will be obvious that the use of the verb “to comprise” and its conjugations does not exclude the presence of any other elements besides those defined in any claim. The word “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
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| Number | Date | Country | |
|---|---|---|---|
| 20220031567 A1 | Feb 2022 | US |
