it is the essence of this invention to provide a durable and tough container that can reliably endure long - term storage at very low cryogenic temperature environments . such containers are essential to preserve valuable and perishable contents such as rare blood or progenitor cells of neonatal . the present invention provides a metallic container characterized with high strength and high toughness to endure very low cryogenic temperature . it is known that cold temperatures embrittle materials causing it to fracture at much lower than normal impacts . by using tough metals that greatly minimize the effect of embrittlement , containers are capable of withstanding stresses or impacts at low temperatures . a top view of a metallic container 20 is shown in fig1 . the container is generally having the shape of a rectangular parallelepiped with a large flat base and a relatively little height . the large flat base and top surfaces are referred to as planar surfaces 24 . the side surface that is substantially perpendicular to and circumscribes the two planar surfaces is referred to as sidewall 25 . the planar surface having rounded corners 26 enabling the sidewall to blend into a matching curvature at each corner . the sidewall also blends with the planar surfaces along the edges forming a merging contour that minimizes any stress concentration in the structure . fig1 further portrays tubular ports 22 used for fluid channeling are extended from the edge of the container . one portal is connected to a plastic tube 42 that could be integrated with a disposable bags set ( not shown ) used to collect blood . a second portal is shown having a spike connection port 44 . the third portal is connected to a needle insertion port 46 . container volume can range from 1 ml to 1000 ml depending on the application . tubing 42 could also carry at its free end a suitable sterile or aseptic connection device ( not shown ), to establish communication with a source of material that is to be conveyed into the container 20 . once the material is transferred into the container , the tubing 42 can be closed by a conventional radio frequency heat seal , which permits tubing 42 beyond the seal to be disconnected from the container 20 . in a preferred embodiment , the metallic container is fabricated of austenitic stainless steel sheet metal alloy . this steel alloy having high concentration of nickel that greatly enhances its ability to withstand very low temperature environments . as alternative material titanium alloy can also be used to fabricate containers . although there are many ways of fabricating metallic containers , the most practical fabrication method for this invention is to weld two previously formed half shells . a special tool encompassing the features of the container is used form a half shell 30 shown in fig2 . a large and flat planar surface 24 is bounded by an undersized sidewall 25 . the sidewall blends with the planar surface in a contoured curvature of a constant radius . a defined number of extensions 32 having the shape of a half cylinder sectioned by a plane passing through its longitudinal axis are originated at the top of the sidewall 25 . referring to fig3 , a side view of a welded container is illustrated . two half shells 30 are matched together and welded at the seam 35 . the two half shells are matched in a way that the free end of the sidewall of each half shell touches the free end of the sidewall of the other half shell . the seam 35 is materialized at the contact line between the two sidewalls . it is preferred to use high precision laser welder technology to join the two half shells . matching extensions 32 of each half shell form a cylindrical port 22 at the edge of the container . as shown in the cross sectional are in fig3 , it is preferable in some applications to seal bond plastic bushings 48 to the welded tubular ports 22 to facilitate the bonding of plastic tubing 42 , spike ports 44 or needle ports 46 to the container . the plastic bushings are seal welded or bonded to the metallic tubular ports . in an alternative embodiment , the sidewalls 25 on the matching half shells 30 are extended slightly to establish an overlap between the sidewalls used for lap welding . a top view of a half shell 40 bounded with a flange is shown in fig4 . in this configuration , the sidewall 25 that surrounds the planar surface 24 is terminated with a flange 34 that is situated in plane parallel to the planar surface . the flange completely encircles the sidewall and edges all the concaved channels on the extensions 32 along the longitudinal axis . the flange has a constant width and it is oriented away from the planar surface and away from the concaved channels on the extensions . two symmetrical half shells 40 are matched and welded at the flange forming a sealed container with defined ports . fig5 shows a cross sectional view of a container fabricated by welding two half shells at the flange . the matching flanges 34 could be laser welded at the seam 35 , heat resistance weld , or brazing at the mating flange surfaces 33 . the matching flanges could be brazed or bonded at the mating surfaces . in another method , the container 20 is fabricated by welding two half shells 30 or 40 that do not have any extension member 32 . tubular cylinders 22 are welded afterward to the container surface after a matching hole is cut allowing for the fluid to channel through the tubular port . referring to fig5 , a plastic laminate 75 covering the inner wall of the enclosure is shown . this laminate is a further step to enhance the biocompatibility characteristics of the container and allows the usage of different metal alloys such as aluminum to fabricate the container . in other embodiments a biocompatible coating is used to cover the inner surface of the container to protect the contents . a top view of rigidly connected containers 20 is shown in fig6 . these containers are attached by one or more welded metallic strip 36 . these strips having defined cutting lines 56 that can be easily cut by pliers or scissors . containers are safely separated by cutting the joining metallic strips along the defined cutting lines 56 without compromising the sterility of the content in each container . alternatively , these containers can be fabricated from previously formed half shells that have more than one recessed structure . such half shells having at least two shallow depressions , each embracing a planar base surrounded by a sidewall , are welded forming two joint containers . fig7 depicts an alternative way of joining two or more containers . a holding fastener 38 that securely clinches on two or more containers to maintain them physically in combination . the fastener having defined breakable lines 58 strategically placed between the attached containers . containers can be easily separated by simply breaking the holding fastener at the breaking line between the containers . the breaking line secures a safe separation of the containers without compromising the sterility of the contents in each container . fig7 also illustrates a portion of tubing set 50 connected to the joint containers by portals 22 . this tubing set is originally connected to a set of bags and harnesses ( not shown in the figure ) to collect blood and separate components . some bags on the set contain cryoprotectant fluids that stabilize the cells or membranes for freezing . referring to fig8 a cross section view of a container fabricated by welding a half shell 30 or a flanged half shell 40 to a flat sheet metal 45 is shown . fig8 also illustrates a flexible corrugated geometry 70 . this geometry is flexible enough to adjust the container shape for limited volume expansion . the flexible geometry feature is used to relief stresses caused by expanding frozen fluid inside the container . fig9 demonstrates a top view a container encompassing a coned shape edge 52 that merges into a tubular port 22 to facilitate the exiting of fluids . a little holder 54 attached to the container is used to hold the container to a hook or to an iv pole . referring to fig1 and fig1 that demonstrate a container having two compartments 55 connected by a passageway 60 . each compartment having an identification label 65 secured to its outer surface . the passageway can be seal welded at two spots 62 and then is cut across the line 64 to safely segregate the two compartments . a seal weld 62 assures the integrity of each compartment and secures the sterility of the content . having now described a few embodiments of the invention , it should be apparent to those skilled in the art that the foregoing is merely illustrative and not limiting , having been presented by way of example only . numerous modifications and other embodiments are within the scope of ordinary skill in the art and are contemplated as falling within the scope of the invention as defined by the appended claims and equivalents thereto . the contents of all references , issued patents , and published patent applications cited throughout this application are hereby incorporated by reference . the appropriate components , processes , and methods of those patents , applications and other documents may be selected for the present invention and embodiments thereof .
metallic containers with high toughness characteristics are utilized to cryopreserve blood products and more particularly neonatal stem and progenitor cells at cryogenic temperatures . metallic containers with high toughness and strength characteristics are durable at low temperatures and are capable to endure high stresses and impacts at − 196 ° c . these containers are better fit to preserve blood products without compromising their sterility or their medical integrity . methods for fabricating metallic containers are also disclosed .