Abstract:
A connection part providing communication between biopharmaceutical containers and/or conduits, includes a connection sheath ( 32 ) and two connection skirts ( 38   a   , 38   b ). The connection sheath ( 32 ) and both connection skirts ( 38   a   , 38   b ) have resiliency such that the connection part ( 30 ), from a disassembled state, is transversely stretchable, at the site of both connection skirts ( 38   a   , 38   b ) thereof, until transversely widened without loss of integrity so as to be made threadable through both collars ( 14, 24 ). Then, due to the resiliency thereof, the connection part contacts, with resilient clamping for support and with sealability, the coupled portion of the outer surface of both collars ( 14, 24 ). Moreover, from the assembled state, the connection part is transversely stretchable, at the site of both connection skirts ( 38   a   , 38   b ) thereof, until transversely widened so as to be capable of being unthreaded from both collars ( 14, 24 ) and thus be converted to the disassembled state.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to connections (i.e., a physical bond) with communication between biopharmaceutical containers and/or conduits. 
     2. Description of the Related Art 
     First of all, the invention more particularly has as its object a connecting part with communication for biopharmacy designed to connect two containers and/or conduits and to bring their inner spaces into communication. Secondly, a unit comprising such a connecting part with communication and at least one blocking clamp, and/or at least one functional means placed at least partially in the inner space of such a part. Thirdly, an assembly that consists of such a connecting part with communication, a first container or conduit, and a second container or conduit. Fourthly, a functional device for implementing a biopharmaceutical process that comprises at least a first container or conduit and a second container or conduit participating in such an assembly. And, fifthly, a process for connecting two containers and/or conduits with communication in biopharmacy. 
     Here, biopharmacy or biopharmaceutical is defined as that which relates to biotechnology, to pharmacy, and more generally to the medical field. In particular, biopharmaceutical product is defined as a product that is obtained from biotechnology—culture media, cellular cultures, buffer solutions, liquids of artificial nutrition, or a pharmaceutical product or more generally a product that is designed to be used in the medical field, at least in part in solid form that is more or less finely divided, in liquid form, or in paste form. 
     In biopharmacy, the need exists to be able to connect with communication, in a stationary, removable and sealed manner, parts such as—or parts of—containers and/or conduits, which, if necessary, can be integrated in more or less complex units that can comprise several containers and/or conduits that are combined with one another, and, if necessary, one or more access means in the inner space of such containers and/or conduits and/or one or more functional means. Such functional means are, for example, capable of and designed for treatment of a biopharmaceutical product, for example a means for mixing, aeration, measuring (collecting) data, or pumping, or capable of and designed for support of the containers and/or conduits. Such functional means are, as appropriate, capable of and designed to be placed completely inside or outside or partly inside and partly outside such containers and/or conduits. 
     Here, “containers” conventionally refers to that which in biopharmacy is capable of and designed in its inner space to contain, encase or enclose certain biopharmaceutical contents or, if necessary, several biopharmaceutical contents, in a more or less long-lasting or permanent static manner. Such biopharmaceutical contents are typically a biopharmaceutical product but can also be a functional means, as defined above. Such containers are, for example, pouches, sheaths, containers, receptacles, bioreactors, or else funnels for biopharmaceutical use, where this list is not limiting. 
     Such containers, considered collectively, are either rigid or flexible (for example, to be able to be folded flat before use) or partially rigid and partially flexible. As appropriate, they are made of stainless steel or plastic, with these embodiments not being limiting, and their capacity can range from less than one liter to more than 3,000 liters, with these values not being limiting. 
     Depending on the applications, such containers have a function of storage, shipping, handling, transfer or else bioreaction, where this list is not limiting. 
     As appropriate, such containers are for multiple use or single use. 
     SUMMARY OF THE INVENTION 
     The object of the invention is the case of such containers of the type comprising, in particular toward at least one end, at least one resistant annular collar. Such a collar extends axially toward the outside of the container. Such a collar comprises a terminal radial bulge that extends laterally toward the outside. Such a collar limits toward the inside an opening that allows access to the inner space of the container for the purpose in particular of introducing into, or extracting from, the container, respectively, the or some of the biopharmaceutical contents. 
     Examples of such containers are described in particular in the documents WO 2009/053572 and WO 2010/007273 and WO 2009/118494. 
     Here, “conduit” conventionally refers to that which in biopharmacy is capable of and designed for channeling or guiding one or more biopharmaceutical contents and more specially biopharmaceutical products, in its elongated inner space, in such a way as to allow its movement from upstream to downstream. Such conduits are, for example, tubes, ports, drains, pipes, sheaths, or else funnels for biopharmaceutical use, where this list is not limiting. 
     Such conduits, considered collectively, are either rigid or flexible or partially rigid and partially flexible. As appropriate, they are made of stainless steel or plastic, with these embodiments not being limiting. As appropriate, their length and their diameter, respectively, are more or less large. 
     Depending on the applications, such conduits have a transfer function, but they can also have a preservation function, for example for sampling, where this list is not limiting. 
     As appropriate, such pipes are for multiple use or for single use. 
     The object of the invention is the case of such conduits of the type comprising a rigid annular collar at least one end. Such a collar extends axially toward the outside of the conduit. Such a collar comprises a terminal radial bulge that extends laterally toward the outside. Such a collar limits the opening of the conduit toward the inside. 
     It is understood that the distinction made above between container and conduit essentially aims to illustrate each of them, not to contrast them, a funnel, for example, able to be seen, according to the time under consideration and the function met, as a container (ensuring a holding function in a location corresponding to the inner space of the funnel) or as a conduit (ensuring a channeling function in the inner space of the funnel). However, in all of the cases, the container or the conduit comprises at least one resistant annular collar that extends toward the outside, comprising a terminal radial bulge that extends laterally toward the outside and that limits an opening of the container or the conduit toward the inside. 
     Traditionally and as disclosed in the ISO 2852: 1993 standard, it is provided to assemble and to connect two such collars in a stationary, removable and sealed way, by means of a clamp that acts as a flange, comprising two jaws connected between them, for example articulated, and tightening and locking means. Such clamps, also known under the name of “tri-clamp,” are the object of numerous variant embodiments, such as those described in particular in the documents EP-A-1230505, U.S. Pat. No. 6,708,377, and U.S. Pat. No. 7,384,078, where this list is not limiting. Such a tri-clamp conventionally comprises a tightening cuff that at each of its two ends has a corresponding bulge, with a tightening element cooperating structurally and functionally with the lateral radial bulges opposite to the first biopharmaceutical container or conduit and the second biopharmaceutical container or conduit. More specifically, the clamp, flange or tri-clamp is capable of and designed to come to be tightened on the first and the second lateral terminal radial bulges by keeping them firmly against one another by their transverse end faces, to prevent their inadvertent disassembly and to ensure sealing. The object of the documents EP-A-0997155 and EP-A-1352851 is the implementation of such clamps or tri-clamps. 
     These embodiments have a certain number of limits and drawbacks. These tri-clamps, which are conventionally for multiple use, are expensive. They are ill-suited to the increasingly common and desired case of single use (per se or for a process overall). Most often, their inside diameter does not exceed about ten centimeters, whereas more and more frequently, the use of biopharmaceutical devices that are larger in size, in particular involving openings of containers, is considered. Their installation often proves difficult, long and hazardous, to the extent that the operator has to hold the tri-clamp and maneuver it (to close it) and simultaneously hold at least either the first container or conduit and the second container or conduit, and even both, while keeping them perfectly positioned relative to one another. These drawbacks are unacceptable when, as is more and more often desired, the two parts have to be able to be assembled quickly and more easily. 
     In addition, these embodiments only allow the assembly of a first biopharmaceutical container or conduit and a second biopharmaceutical container or conduit whose respective openings have identical diameters. 
     The document US-A-2003/0080140 describes a pouch, here of small capacity, having an exit port on which is mounted a connector on which in its turn is mounted a tube. 
     The document DE 20 2008 006416 U1 describes an outlet in the form of a collar with an annular projection on which a tube is mounted. 
     The document EP-A-1950481 describes a silicone pipe and a reusable connector for connecting one pipe end to such a silicone pipe. 
     The document U.S. Pat. No. 6,653,377 describes a system for the transfer of particles using a cartridge unit with multiple O-ring seals that can be mounted either on the unloading port or the loading port of a piece of transformation equipment. 
     The devices that are the object of these last four documents have a general scope but do not pertain to the application that is more especially targeted by the invention. 
     Consequently, in the biopharmaceutical field, the need exists for being able to connect with communication, in a stationary, removable and sealed manner, a first collar and a second collar as described above, belonging to a first biopharmaceutical container or conduit and to a second biopharmaceutical container or conduit, respectively, in such a way as to ensure communication between the first opening and the second opening, respectively, of the first biopharmaceutical container or conduit and the second biopharmaceutical container or conduit. 
     More specifically, this need exists with, as requirements, the possibility of a single use (per se or for a process overall), a low cost, a quick and reliable installation (i.e., mounting or assembly) and disassembly, an airtight mounting or assembly, a possibility of application in the case of a first opening and a second opening having different diameters, being able to reach about 50 centimeters. 
     Also, in biopharmacy, the need exists to use functional devices of the type comprising a first biopharmaceutical container or conduit and a second biopharmaceutical container or conduit connected to one another with communication, in such a way as to meet the above-mentioned requirements, in particular following a “versatile” design as to applications, functions performed, and diameters of openings. Concerning the biopharmaceutical field, it is also important that the materials that are used are such that the components and devices produced from them keep their integrity during sterilization, for example by γ-radiation, and that the devices that are used meet the approval of the health authorities and are compatible with use in a clean room. 
     The invention has as its object to meet these needs encountered in biopharmacy. 
     For this purpose, according to a first aspect, the invention has as its object a connecting part with communication for biopharmacy, capable of being either in a disassembled state or in an assembled state where it is connected to and between a first resistant annular collar and a second resistant annular collar limiting a first opening and a second opening of two containers and/or conduits forming a first inner space and a second inner space and capable of, in the assembled state, being located in a communication configuration where it ensures communication between the two inner spaces of two containers and/or conduits, comprising, forming a whole:
         A connecting sheath closed laterally on itself, provided at its first free end part and at its second free end part with a first communication opening and a second communication opening, capable of forming and limiting an inner space for connection in communication by the two openings to the first inner space and to the second inner space of the two containers and/or conduits,   At the first free end part of the sheath, a first annular and peripheral outer connecting skirt, whose inner lateral face is capable of coming into contact with elastic tightening for holding and sealing on a part mated to the outer face of the first collar,   At the second free end part of the sheath, a second annular and peripheral outer connecting skirt, whose inner lateral face is capable of coming into contact with elastic tightening for holding and sealing on a part mated to the outer face of the second collar,   The sheath and the two connecting skirts being integral, made of an inherently airtight material for biopharmacy and having an elasticity such that the connecting part with communication is capable of, on the one hand, starting from the disassembled state, being stretched transversely at the site of its two connecting skirts until it is broadened transversely, without loss of integrity, to be made capable of being threaded onto the two collars, and then, by its elasticity, coming into contact with elastic tightening for holding and sealing on the part mated to the outer face of the two collars and thus being brought into the assembled state, without the necessity for an extrinsic attachment part, and, on the other hand, starting from the assembled state, being stretched transversely at the site of its two connecting skirts until being broadened transversely to be able to be unthreaded from the two collars and thus to be brought into the disassembled state,   The connecting part with communication being capable of, in the assembled state and in the communication configuration, allowing location and/or channeling in its inner space of at least certain biopharmaceutical contents ( 10   a ) originally located in the inner space of a container or conduit.       

     This part is such that the inner lateral faces of one and the other of the connecting skirts comprise a cylindrical zone of larger inside diameter adjacent to the sheath, a cylindrical zone of smaller inside diameter adjacent to the free end edge of the connecting part with communication and a tapered zone placed between the cylindrical zone of large inside diameter and the cylindrical zone of smaller inside diameter. 
     According to one embodiment, the first communication opening and the second communication opening have different diameters. In particular, the first communication opening and the second communication opening have different diameters in a ratio that ranges from 1 to 10. 
     According to one embodiment, the inner face of the connecting part is essentially without rough spots, reliefs or roughness, and more especially is smooth. 
     According to one embodiment, the connecting part with communication is capable of being located in a flattened configuration for transverse blocking of at least one transverse blocking zone where the zones opposite the inner face of the sheath are applied against one another and prevent communication on both sides of such a transverse blocking zone. 
     According to one embodiment, the connecting part with communication comprises a single first and/or second free end part and a single first and/or second connecting skirt, the connecting part with communication being designed to be connected with communication to a single first and/or second collar of a single first and/or second container or conduit. 
     According to one embodiment, the sheath and the two connecting skirts are made of an inherently anti-static material or a material that is made extrinsically anti-static. 
     According to one embodiment, the sheath and the two connecting skirts are made of silicone or comprise silicone. 
     According to one embodiment, the connecting part with communication for biopharmacy is disposable. 
     According to a second aspect, the invention has as its object a unit that comprises a connecting part with communication for biopharmacy as has just been described and at least one blocking clamp that is capable of being located either in an inactive open configuration or in a closed configuration in which it is capable of coming to be placed around the sheath and being applied to the zones opposite its outer face in at least one transverse blocking zone, in such a way that the zones opposite the inner face of the sheath are applied against one another and prevent communication on both sides of such a transverse blocking zone. 
     According to a second aspect, the invention has as its object a unit that comprises a connecting part with communication for biopharmacy as was just described and at least one functional means placed at least partially in the inner connecting space. 
     According to a third aspect, the invention has as its object an assembly that consists of a connecting part with communication for biopharmacy as was just described, a first container or conduit, and a second container or conduit, such that:
         The inner lateral face of the first connecting skirt is in contact with elastic tightening for holding and sealing on a part mated to the outer face of the first collar, without the necessity for an extrinsic attachment part,   And the inner lateral face of the second connecting skirt is in contact with elastic tightening for holding and sealing on a part mated to the outer face of the second collar, without the necessity for an extrinsic attachment part.       

     According to one embodiment, the assembly comprises a single first and/or second container or conduit and a connecting part with communication for biopharmacy in the corresponding embodiment of this part. 
     According to one embodiment, the assembly also comprises at least one functional means placed at least partially in the inner connecting space. 
     According to a fourth aspect, the invention has as its object a functional device for the implementation of a biopharmaceutical process that comprises at least one first container or conduit and a second container or conduit having to be connected with communication, in which the first container or conduit, the second container or conduit, and a connecting part with communication for biopharmacy as was just described form an assembly such as was just described. 
     According to a fifth aspect, the invention has as its object a process for connecting with communication in biopharmacy: two containers and/or conduits respectively comprising a first resistant annular collar and a second resistant annular collar limiting a first opening and a second opening, characterized by the fact that:
         There are the first container or conduit and the second container or conduit,   There is a connecting part with communication for biopharmacy as was just described being in the disassembled state,   The connecting part with communication is stretched transversely at the site of its two connecting skirts until being broadened transversely to be able to be threaded onto the two collars,   Then, the connecting part with communication is allowed to come, by its elasticity, into contact with elastic tightening for holding and sealing on the part mated to the outer surface of the two collars and thus to be brought into the assembled state, without the necessity for an extrinsic attachment part.       

    
    
     
       BRIEF DESCRIPTION OF THE DRAWING FIGURES 
       Other characteristics and advantages will clearly emerge from the description that is given below, by way of indication and in no way limiting, with reference to the accompanying drawings, in which: 
         FIG. 1  is a perspective representation of an assembly consisting of a connecting part according to the invention that makes possible communication between a first container and a second container; 
         FIG. 2  is a cutaway representation of the assembly of  FIG. 1  in which the first collar of the first container is spaced in the vertical direction of the second collar of the second container; 
         FIG. 3  is a cutaway representation of the assembly of  FIG. 1 , in which the first collar of the first container is partially introduced into the inner space defined by the second collar of the second container; 
         FIG. 4  is a cutaway representation of the assembly of  FIG. 1  in which a blocking tool is used to hold the connecting part in a closed configuration in a transverse blocking zone; 
         FIG. 5  is a cutaway representation of an assembly that consists of a connecting part according to the invention that makes possible communication between two first containers and a second container; 
         FIG. 6  is a cutaway representation of an assembly that consists of a connecting part according to the invention that makes possible communication between a first container and two second containers; 
         FIG. 7  is a cutaway representation of an assembly that consists of a connecting part according to an alternative embodiment of the invention that makes possible communication between a first container and a second container. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  is a perspective view of an assembly  2 . 
     This assembly  2  consists of a first container  10  that forms a transparent and hermetically-sealed flexible pouch that is capable of containing a biopharmaceutical upstream product  10   a  that is at least partly in more or less finely divided solid form, in liquid form, or in paste form (culture media, cellular cultures, buffer solutions, liquids of artificial nutrition, etc.). 
     In this case, this first container  10  forms a transparent, flexible pouch. However, this first container  10  could also have a different shape, produced from a solid and non-transparent material. 
     This first container  10  forms a first inside space  12  and comprises one end on which a first annular collar  14  that limits a first opening  16  is formed. 
     The assembly  2  of  FIG. 1  also comprises a second container  20  that forms a solid and hermetically-sealed  3 D pouch inside of which a second inner space  22  is defined that can contain a downstream product  20   a  such as a liquid, a fluid, or any other type of biopharmaceutical, pharmaceutical or medical product. 
     This second container  20  comprises an upper surface  21   a  on which a second annular collar  24  that limits a second opening  26  is formed. The second container  20  has, furthermore, a lower surface  21   b  opposite to the upper surface  21   a  as well as four lateral surfaces  21   c  connecting the upper surface  21   a  and the lower surface  21   b . One of the four lateral surfaces  21   c  comprises a large number of communication openings that are capable of being connected to the end of transfer pipes  28  so as to transfer in particular downstream product  20   a  toward secondary containers. 
     According to a non-limiting embodiment, these transfer pipes  28  can also form a closed circuit that is equipped with a peristaltic pump that makes it possible to circulate and to continually mix the downstream product  20   a.    
     As above, the second container  20  can also have a different shape from the one illustrated in  FIG. 1 . More particularly, if reference is made to containers  10 ,  20  with reference to illustrative  FIGS. 1 to 7 , it should be recalled that the invention is not limited to the connection of such containers but on the contrary extends to the connection of any type of conduits as cited above. 
     The assembly  2  of  FIG. 1  also comprises a connecting part  30  that comprises a connecting sheath  32  that is closed laterally on itself. The connecting sheath  32  is provided at a first free end part  32   a  with a first communication opening  34   a  and at a second free end part  32   b  with a second communication opening  34   b . Between its first and second communication openings  34   a ,  34   b , the connecting sheath  32  is capable of forming and limiting an inner connecting space  36 . 
     Advantageously, the connecting sheath  32  has, in the assembled state and in communication configuration, a general cylindrical or tapered shape with a transverse cross-section that is at least approximately circular or pseudo-circular. 
     It also has an inner face that is essentially without rough spots, reliefs or roughness. This inner face more especially is smooth so as, on the one hand, not to slow down the transfer of the upstream product  10   a  toward the second container  20 , and, on the other hand, not to keep this upstream product  10   a  inside the connecting part  30 . 
     At the first free end part  32   a  of the connecting sheath  32 , there is formed a first annular and peripheral outer connecting skirt  38   a , whose inner lateral face is capable of coming into contact with elastic tightening for holding and sealing on a part that is mated to the outer face of the first collar of the first container  10 . 
     At the second free end part  32   b  of the connecting sheath  32 , there is formed a second annular and peripheral outer connecting skirt  38   b , whose inner lateral face is able to come into contact with elastic tightening for holding and sealing on a part that is mated to the outer face of the second collar  24  of the second container  20 . 
     Thus, as  FIG. 1  illustrates, the first free end part  32   a  of the connecting part  32  can be connected to the first annular collar  16  of the first container  10  and the second free end part  32   b  of the connecting sheath  32  can be connected to the second annular collar  26 . 
     It should be pointed out that the connecting sheath  32  and the first and second connecting skirts  38   a ,  38   b  are integral and are formed in an inherently airtight material for biopharmacy. This connecting sheath  32  and these first and second skirts  38   a ,  38   b  have an elasticity such that the connecting part  30  is capable of, on the one hand, starting from a disassembled state, being stretched transversely at the site of its two connecting skirts  38   a ,  38   b  until being broadened transversely, without loss of integrity, to be made capable of being threaded onto the two annular collars  14 ,  24  of the first and second containers  10 ,  20 , and then—by its elasticity—coming into contact with elastic tightening for holding and sealing on the part mated to the outer face of the two annular collars  16 ,  26 . Thus, the connecting part  30  can be brought into the assembled state, without the necessity for an extrinsic attachment part. In addition, the connecting sheath  32  and the first and second connecting skirts  38   a ,  38   b  have an elasticity such that the connecting part  30  is capable of, on the other hand, starting from the assembled state, being stretched transversely at the site of its two connecting skirts  38   a ,  38   b  until being broadened transversely for being able to be unthreaded from the two annular collars  16 ,  26  and thus being brought into the disassembled state. 
     So as to connect with communication the first and second containers  10 ,  20 :
         There are the first container  10  and the second container  20 ,   There is a connecting part  30  with communication that is in the disassembled state,   The connecting part  30  with communication is stretched transversely at the site of its two connecting skirts  38   a ,  38   b —successively or simultaneously—until being broadened transversely to be able to be threaded respectively onto the first and second collars  16 ,  26 ,   And then, the connecting part  30  is allowed to come, by its elasticity, into contact with elastic tightening for holding and sealing of the part that is mated to the outer face of the two collars  16 ,  26  and thus to be brought into the assembled state, without the necessary for an extrinsic attachment part.       

     In this way, the inner lateral face of the first connecting skirt  38   a  is in contact with elastic tightening for holding and sealing on a part that is mated to the outer face of the first annular collar  16 , without the necessity for an extrinsic attachment part, and the inner lateral face of the second connecting skirt  38   b  is in contact with elastic tightening for holding and sealing on a part that is mated to the outer face of the second annular collar  26 , without the necessity for an extrinsic attachment part. 
     Furthermore, the connecting part  30  is capable of, in the assembled state and in the communication configuration, allowing location and/or channeling in its inner space of at least one portion of the upstream product  10   a  that is originally located in the inner space of the first container  10 . 
     It should be emphasized that, according to the embodiment of  FIG. 1 , the connecting sheath  32  and the first and second connecting skirts  38   a ,  38   b  are of a single manufacturing piece. This makes it possible to ensure optimal containment inside the inner connecting space  36 , without the risk of leaks linked to the assembly of the connecting sheath  32  with the first and second connecting skirts  38   a ,  38   b.    
     However, it could also be envisioned that one or the other of the first and second connecting skirts  38   a ,  38   b —and even both—are connected to the connecting sheath  32  by bonding, welding, sewing or any other attachment means making it possible to ensure an adequately hermetically-sealed bond for the communication of biopharmaceutical products. 
     In contrast, according to an embodiment, the connecting sheath  32  and the first and second connecting skirts  38   a ,  38   b  are made of an inherently anti-static material or a material that is made extrinsically anti-static. Thus, the passage of the biopharmaceutical product, in particular when it is powdery inside the inner connecting space  36 , is not slowed down because of the inner wall of the connecting sheath  32 . 
     In addition, according to an embodiment, the connecting sheath  32  and the first and second connecting skirts  38   a ,  38   b  are made of silicone or partly comprise silicone. 
     The first container  10 , the second container  20 , and/or the connecting part  30  can be disposable, which makes it possible to eliminate any cleaning stage after the upstream product  10   a  has been poured into the second container  20 , for example. 
       FIG. 2  is now described in detail. 
     The latter shows, in vertical cutaway, the assembly  2  of  FIG. 1  and specifies the structure of the first annular collar  14  and the second annular collar  24 . 
     More particularly, the latter have mechanical characteristics such that it is possible for them to take on the pressures exerted respectively by the first free end part  32   a  and the second free end part  32   b  of the connecting sheath  32 , without undergoing substantial modification of their geometry. Without this, the hermetic nature of the communication between the first container  10  and the second container  20  could be altered. 
     According to this embodiment, the inner lateral faces of both of the first and second connecting skirts  38   a ,  38   b  comprise a cylindrical zone of larger inside diameter  40 GD adjacent to the connecting sheath  32 , a cylindrical zone of smaller inside diameter  40 PT adjacent to the free end part  32   a ,  32   b  of the connecting part  30 , and a tapered zone  40 TR placed between the cylindrical zone of larger inside diameter  40 GR and the cylindrical zone of smaller inside diameter  40 PT. 
     In the same way, the outer surfaces of both the first and second annular collars  14 ,  24  comprise a cylindrical zone of larger outside diameter  14 GR,  24 GR, close to their end edge, a cylindrical zone of smaller outside diameter  14 PT,  24 PT, and a tapered zone  14 TR,  24 TR placed between the cylindrical zone of larger diameter  14 GD,  24 GD and the cylindrical zone of smaller outside diameter  14 PT,  24 PT of the first and second annular collars  14 ,  24 . 
     Thus, holding the first and second connecting skirts  38   a ,  38   b  on the first and second annular collars  14 ,  24  respectively is ensured not only by the elasticity of the material forming the connecting part  30  but also by the complementary shape of these first and second connecting skirts  38   a ,  38   b  with the first and second annular collars  14 ,  24 . 
     The pressure exerted by the tapered zone  40 TR of the first and second connecting skirts  38   a ,  38   b  on the tapered zone  14 TR,  24 TR of the first and second annular collars  14 ,  24  is thus amplified when the first connecting skirt  38   a  is removed from the second connecting skirt  38   b.    
     The hermetic nature of the assembly  2  formed in particular by the connecting part  30  is thus supplemented. 
     According to the embodiment of  FIG. 2 , the outer lateral faces of both of the connecting skirts  38   a ,  38   b  also comprise a cylindrical zone of larger outside diameter  40 GR adjacent to the connecting sheath  32 , a cylindrical zone of smaller outside diameter  40 PT adjacent to the free end edge of the connecting part  30  and a tapered zone  40 TR placed between the cylindrical zone of larger outside diameter  40 GD and the cylindrical zone of smaller outside diameter  40 PT. 
     In this way, the first connecting skirt  38   a  and the second connecting skirt  38   b  comprise an identical or essentially identical radial thickness in the cylindrical zone of larger diameter  40 GR, in the cylindrical zone of smaller diameter  40 PT, and in the tapered zone  40 TR. This makes it possible to simplify the geometry of the connecting part  30  and therefore to facilitate its production. 
     According to an alternative embodiment, these first and second connecting skirts  38   a ,  38   b  could, however, have a larger radial thickness in the cylindrical zone of larger diameter  40 GR than in the cylindrical zone of small diameter  40 PT and in the tapered zone  40 TR. Such an embodiment advantageously makes it possible to reinforce the mechanical properties of the first and second connecting skirts  38   a ,  38   b  in this cylindrical zone of larger diameter  40 GR so as to make possible its stretching without running the risk of damaging it. 
     It should also be emphasized that according to the embodiment illustrated by this  FIG. 2 , both of the connecting skirts  38   a ,  38   b  have a tapered zone  40 TR. The tapered zone  40 TR ensures optimal holding of the connecting skirts  38   a ,  38   b  on the first and second annular collars  14 ,  24 . 
     Furthermore, several different angles could be used. 
     In contrast, the first communication opening  34   a  and the second communication opening  34   b  can have identical or different diameters. For example, the connecting part  30  can act to reduce or expand the diameter for the connection with communication of two containers  10 ,  20  and/or conduits whose first opening  16  and second opening  26  have different diameters. 
     According to the embodiment of  FIG. 2 , the first opening  16  of the first container  10  has a diameter that is smaller than that of the second opening  26  of the second container  20 . In the same way, the first communication opening  34   a  of the first skirt  38   a  has a diameter that is smaller than that of the second communication opening  34   b  of the second skirt  38   b . Thus, the transfer of the upstream product  10   a  from the first container  10  and toward the second container  20  does not generate a bottleneck. This difference in diameter is advantageously encompassed in a ratio that ranges from 1 to 10. 
     In the case where the difference in diameter is adequate, because of the flexibility of the connecting sheath  32 , the connecting part  30  is capable of being located when it is not connected to the containers  10 ,  20 :
         In a flattened configuration where the zones opposite the inner face of the sheath are applied against one another, and/or   In a configuration that is folded like an accordion on itself, with the first free end part  32   a  and the second free end part  32   b  of the sheath  32  being brought close together, and even adjacent to one another.       

     This makes it possible in particular to facilitate the conditioning of these connecting parts  30  by considerably reducing the space necessary for their storage. 
     It is also possible, however, to produce a first communication opening  34   a  and a second communication opening  34   b  having a diameter that is identical or essentially identical for the connection with communication of two containers and/or conduits whose first opening  16  and second opening  26  have a diameter that is identical or essentially identical. 
     In a general way, furthermore, the first connecting skirt  38   a  and the second connecting skirt  38   b  can have, in axial cross-section, an identical or essentially identical shape and an identical or essentially identical axial length, in a ratio that is at least of the same order as the ratio between the diameters of the first communication opening and the second communication opening. 
     The embodiment of  FIG. 3  is now described in detail. 
     The latter is identical to the embodiment of  FIG. 1  except for the fact that the first annular collar  14  of the first container  10  is partially introduced into the second inner space  12  defined by the second collar  24  of the second container  20 . 
     According to this embodiment, the connecting sheath  32  has an elasticity such that the first and second skirts  38   a ,  38   b  are held in position against the first annular collar  14  and the second annular collar  24  and ensures acceptable sealing in the biopharmaceutical field even when the connecting sheath  32  is not stretched. 
     According to this embodiment, the connecting sheath  30 , because of its flexibility, can then be curved to allow the introduction of the first annular collar  14  of smaller diameter into the second annular collar  24  of larger diameter. 
     The embodiment of  FIG. 4  is now described in detail. 
     This embodiment is also similar to the embodiment of  FIG. 1 . However, in this case, the connecting part  30  is no longer found in an inactive open position but in a closed blocking configuration in a transverse blocking zone  42 . In this closed configuration, the zones opposite the inner face of the connecting sheath  30  are applied against one another and prevent communication on both sides of the transverse blocking zone  42 . This embodiment can be used to temporarily prevent the upstream product  10   a  from flowing through the blocking zone  42  up to the second container  20 . It is particularly useful during the preparation of biopharmaceutical products for managing the quantities of upstream products  10   a  to be used, the filling period of the second container  20 , and, for example, stopping the transfer of upstream product  10   a  toward the second container  20  when the former is filled. 
     More particularly, in this case depicted, a blocking tool  44  is used that serves to keep adjacent to one another the zones of the inner face of the connecting sheath  30  that are opposite. The blocking tool  44  thus makes it possible, from the outside, to exert stresses on the outer face of the connecting sheath  32  in such a way as to bring close, position facing, and to keep adjacent to one another certain zones opposite the inner face of this connecting sheath  30 . 
     According to this embodiment, this blocking tool  44  comprises two arms  44   a ,  44   b  that can move relative to one another, each of them being equipped with a flat association surface  46   a ,  46   b . Thus, the connecting sheath  32  can be obstructed by the blocking tool  44  when it is positioned between these two arms  44   a ,  44   b , and when these two arms  44   a ,  44   b  are brought close to one another, and the flat association surfaces  46   a ,  46   b  are held against one another. 
     The blocking tool  44  also comprises holding means  48  that make it possible to hold in a structural and functional way these flat association surfaces  46   a ,  46   b  opposite one another in such a way as to prevent communication through the blocking zone  42 . 
     According to the proportions of the connecting part  30 , the holding means  48  ensure sealing—acceptable in the biopharmaceutical field—at zones of the inner face of the connecting sheath  32  that are attached. 
     The blocking tool  44  is not limited to the example that is described and illustrated in  FIG. 4  but can, on the contrary, exhibit a different geometry while ensuring sealing of the connecting sheath  32  at the blocking zone  42 . In contrast, this blocking zone  42  is not necessarily transverse but can on the contrary extend into an oblique plane relative to the transverse cross-section of the connecting sheath  32 . 
     The blocking tool  44  that can also be a single bar [sic]. 
       FIGS. 5 and 6  are now described in a detailed manner. 
       FIG. 5  illustrates an embodiment that differs from the embodiment of  FIG. 1  in that the connecting part  30  does not comprise a first free end part  32   a  but two first free end parts  32   a ,  32   a′.    
     As above, each of these two first free end parts  32   a ,  32   a ′ comprises a first skirt  38   a ,  38   a ′ and defines a first communication opening  34   a ,  34   a ′. This embodiment makes it possible to integrate in the second container  20  upstream products  10   a ,  10   a ′—identical or different—that respectively come from two first separate containers  10 ,  10 ′. 
       FIG. 6  illustrates an embodiment that differs from the embodiment of  FIG. 1  in that the connecting part  30  comprises not a second free end part  32   b  but two second free end parts  32   b ,  32   b′.    
     Just as above, each of these two second free end parts  32   b ,  32   b ′ comprises a second skirt  38   b ,  38   b ′ and defines a second communication opening  34   b ,  34   b ′. This embodiment makes it possible to integrate—in one stage—an upstream product  10   a  that originates from the first container  10  into two second containers  20  that are separate from one another. 
     Of course, according to alternative embodiments, the connecting part  30  may no longer contain two first free end parts  32   a ,  32   a ′ or two second free end parts  32   b ,  32   b ′ but x first free end parts  32   a ,  32   a ′,  32   a ″, etc., or x second free end parts  32   b ,  32   b ′,  32   b ″ with x greater than two. 
     This embodiment is particularly advantageous for increasing the rapidity and efficiency of production operation consisting in implementing the transfer of the upstream product(s)  10   a  that originate from the first container(s) toward the second container(s)  20  for the purpose of forming the downstream product(s)  20   a.    
     The first connecting skirts of the large number of first connecting skirts can be of the same size or essentially the same size or else different sizes relative to one another. 
     In a similar way, the first sub-sheaths of the large number of first sub-sheaths are:
         Either of the same axial diameter and/or length or essentially of the same axial diameter and/or length;   Or of axial diameter and/or length that are different from one another.       

     As  FIGS. 1 to 6  illustrate, the connecting part  30  according to the invention can be connected to a first container  10  and to a second container  20  for the purpose of forming a structural and functional unit that makes possible the transfer of upstream product  10   a  through the connecting part  30  and up to the second container  20 . The upstream product  10   a  that is combined with possible other products present in the second container  20  thus forms the downstream product  20   a.    
     However, the connecting part  30  can also contain a functional means such as an element to be placed at least partially in the inner connecting space  36 . 
     This functional means can be formed by any filtration means, buffer storage means, or connection means, which, associated in a structural and functional way with the connecting part  30 , makes possible the transfer according to a suitable operating mode of the upstream product  10   a  toward the second container  20 . According to one embodiment, the functional means can, for example, form a funnel in such a way as to transfer with a dropper the upstream product  10   a  through the connecting part  30 . In an alternative or simultaneous way, the functional means can also form a filter that makes it possible to allow the transfer of only one portion of the upstream product  10   a.    
     The invention is not limited to the embodiments described above but on the contrary extends to any other embodiment that can be used starting from the general knowledge of one skilled in the art. 
     In particular, the connecting part  30  does not necessarily have two connecting skirts  38   a ,  38   b  as described with reference to  FIGS. 1 to 6 . On the contrary, the latter can have connecting skirts  38   a ,  38   b  with alternative geometries that also make it possible to combine the connecting part  30  with the opening of the first or second container  10 ,  20 . 
     For example, according to an embodiment shown in  FIG. 7 , the first container  10  can have a first annular collar  14  that is formed by a first annular part  14   a  with a tapered outside diameter and a second annular part  14   b  also with a tapered outside diameter. The first annular part  14   a  has a larger outside diameter on the portion that is oriented toward the first inner space  12  than on the portion oriented toward the outside, while the second annular part  14   b  has a larger outside diameter on the portion that is oriented toward the outside than on the portion oriented toward the first inner space  12 . 
     The first annular part  14   a  also has a mean diameter that is very slightly less than the mean diameter of the second annular part  14   b . In this way, this first annular part  14   a  can be fitted into the second annular part  14   b  in such a way as to maintain the first connecting skirt  38   a , previously threaded on the first annular part  14   a  by transverse broadening without loss of integrity relative to the first opening  16  of the first container  10 . 
     This configuration can furthermore be adapted either to the first annular collar  14  of the first container  10  or to the second annular collar  24  of the second container  20 , or else to the two annular collars  14 ,  24 .