EP3975973B1 - Transfer cannula - Google Patents

Description

field of technology

The invention relates to a transfer cannula for the sterile transfer of fluids to powders or fluids to fluids from a first container into a second container, with two line sections running in the same direction and having different lengths in the longitudinal direction of the line sections, the longer line section ending in an insertion tip, the line sections being furthermore firmly connected to a coupling wall surrounding the line sections in a cylindrical shape, the coupling wall having, assigned to each tip and opposite one another on both sides with respect to the longitudinal direction of the line sections, a recess extending to an end edge of the coupling wall, in which recess a respective insertion tip of the line sections is exposed in a side view.

State of the art

Transfer cannulas are also known in practice as so-called transfer cannulas. These enable sterile transfer of, for example, fluids to powders or fluids to fluids from a first container to a second container. The conduit sections each pass through a closure element, made of a rubber material, for example, of the respective container. The closure element is pierced by the piercing tip formed at one end of the conduit sections when the transfer cannula is inserted.

The line sections have different lengths in their longitudinal extension, in particular starting from a transverse to the longitudinal extension considered transverse plane, in which both line sections are shown in a corresponding sectional view in a solid cross-section, i.e., closed in the circumferential direction. Based on this, the line section with the piercing tip generally extends over a longer distance than the other line section.

The longer line section having the piercing tip at one end can be the shorter line section when viewed in the opposite direction from the mentioned transverse plane.

Due to this design and arrangement of two pipe sections, a favorable ventilation or de-aeration of the containers can be achieved during the transfer.

Support on or at the containers can be achieved via the coupling wall. The coupling wall can at least partially encompass the container wall with respect to an extension in the direction of the longitudinal extension of the line sections.

The recesses provided in the coupling wall allow the container enclosed by the coupling wall to be grasped, in particular for removal thereof.

Such a transfer cannula is, for example, from the US 6 948 522 B2 known, whereby the coupling wall ends approximately with the insertion tip in the direction of the longitudinal extension of the line sections.

A transfer cannula in which the coupling wall is held displaceably on a support wall in the longitudinal direction of the line sections is further known, for example, from US 5,879,345 known.

From the WO 2012/143921 A1 It is known to construct the transfer cannula in several parts, with separate coupling walls that can be connected to a base body plug.

Summary of the invention

Based on the state of the art according to US 6948522 B2 The invention is concerned with the task of designing a transfer cannula of the type in question which is particularly advantageous in terms of handling.

This object is achieved in the subject matter of claim 1, wherein the line sections are surrounded by a first cylinder region forming a holding migration for a closure region of a container and that the recesses are formed in a second cylinder region which is provided coaxially to the first cylinder region and forms the coupling migration and which extends at a radial distance from the first cylinder region.

A possible solution can also be provided by providing, with respect to a longitudinal extension of the line sections, two support walls extending in opposite directions from a central region, on each of which a coupling wall is movably mounted.

The coupling wall is provided with an axial length such that the free end edge of the coupling wall is formed at a distance from the associated piercing tip of a line section, viewed in the longitudinal direction of the line sections. This longitudinal projection of the coupling wall beyond the piercing tip can achieve favorable guidance of the transfer cannula as a whole, particularly during the piercing process. The coupling wall can thus initially rest in a guiding manner, for example, against the wall of the container to be coupled, whereby at the same time exact alignment, for example centering, of the line sections penetrating the closure element of this container can be achieved, furthermore in particular before such piercing, but also during the piercing process.

The coupling wall is provided with such an axial length that the free end wall of the coupling wall is formed with a longitudinal extension of the line sections to the associated piercing tip of a line section. Furthermore, this longitudinal extension allows the line sections, in particular their free ends, and in particular the piercing tip, to lie protected even in a non-use or preparation position, surrounded by the coupling wall. The line sections, in particular their free ends with the piercing tip, are thus protected from significant contamination or soiling before use of the transfer cannula.

The V-shaped extension of the recess towards the end edge offers particular handling advantages, especially when removing a plug-connected to the transfer cannula Container. The recess can increase in size, for example, by approximately 1.2 to 2.5 times, or further by approximately 1.5 to 2 times, relative to the extent in the circumferential direction of the coupling wall in the direction of the end edge. Furthermore, the V-shaped widening can begin approximately in the middle of the longitudinal extent of the recess, viewed in the direction of the longitudinal extent of the line sections, and furthermore, approximately in the region of a middle third of the longitudinal extent. The section of the recess extending in front of it, viewed in the longitudinal extent, can have a substantially constant extent in the circumferential direction.

With respect to the longitudinal extent of the line sections, two oppositely extending support walls can be provided starting from a central region, on each of which a coupling wall is movably mounted.

The possible arrangement of two opposing support walls with movably mounted coupling walls provides a particularly advantageous design for a transfer cannula compared to known solutions in terms of handling. This allows for a mutually independent arrangement of the containers. Both ends of the transfer cannula, viewed in the longitudinal direction of the line sections, can thus be suitable for receiving the first or second container. The respective application for coupling or decoupling the respective container can thus be identical on both sides.

The features of the above-described independent claims are essential both individually and in any combination with each other of importance, whereby further features of an independent claim can be combined with the features of another independent claim or with features of several independent claims, further also with only individual features of one or more of the other independent claims.

Thus, according to one possible embodiment, two oppositely extending support walls can be provided starting from a central region, on each of which a coupling wall can be movably mounted, wherein one or both coupling walls can project beyond the respective insertion tip in the direction of the longitudinal extension of the line sections and wherein furthermore in one or both coupling walls a recess can be provided which can widen in a V-shape associated with the end edge.

Further features of the invention are explained below, also in the description of the figures, often in their preferred relationship to the subject matter of claim 1 and to features of further claims. However, they may also be important in a relationship to only individual features of claim 1 or the respective further claim, or each may be important independently.

According to a further possible embodiment, the transfer cannula can be designed to be essentially mirror-symmetrical with respect to a center plane running transversely to the longitudinal extension of the line sections. This also results in a design that is favorable in terms of handling. Both end regions of the transfer cannula can be used for attaching both the first and, optionally, the second container. There is not necessarily a fixed assignment of the first and second containers to a possibly predetermined side of the transfer cannula.

The recess can have an extension, starting at the facing piercing tip up to the end edge of the coupling wall, which may correspond to one-third or more of the length of a line section that is completely closed in the circumferential direction. Thus, this excess of the recess beyond the piercing tip, considered in the longitudinal extension of the line sections, may correspond to approximately 0.3 to 0.7 times, and furthermore approximately 0.4 to 0.6 times, the longitudinal extension of a line section that is completely closed in the circumferential direction beyond this extension.

The line sections are surrounded by a first cylinder region forming a holding wall for a closure region of a container, wherein the recesses can further be formed in a second cylinder region which is provided coaxially to the first cylinder region and forms the coupling wall and which runs at a radial distance from the first cylinder region.

The two cylinder areas for forming the containment wall and the coupling wall are aligned coaxially to each other.

The two cylinder areas together with the line sections can also be designed as a single piece and made of the same material, for example by means of a plastic injection molding process.

The support wall formed by the first cylindrical region can, as is also preferred, serve to support the transfer cannula as a whole on a closure region comprising the closure means of the container. The conduit sections can be provided substantially centrally, oriented along a longitudinal central axis of the support wall.

The central plane running transversely to the longitudinal extent of the line sections can be structurally formed by a transverse wall running correspondingly transversely to the longitudinal extent, from which the line sections and the support and/or coupling walls extend on both sides, viewed in the longitudinal direction, wherein the line sections as a whole pass through such a transverse wall.

A terminal edge of the first cylinder region or the support wall, preferably extending transversely to the longitudinal direction of the line sections and spaced longitudinally from the center plane, can, as is also preferred, be overhanged by the piercing tip of one line section. In this case, the piercing tip can project beyond the terminal edge of the support wall, which can correspond to half or less of the length of the line section that is completely closed in the circumferential direction.

In addition, an associated recess of the coupling wall can also end with respect to a side view against the transfer cannula as a whole with a distance to the end edge of the holding wall, viewed in the longitudinal extension of the line sections.

In one possible embodiment, the first cylinder region forming the support wall can be circumferentially closed. In an alternative embodiment, however, this cylinder region can also be partially open in the circumferential direction, possibly even open all the way to the end edge.

On the second cylinder area forming the coupling wall, on the outside wall side in the direction of the line sections, extending ribs. These can serve as anti-roll devices to ensure that the transfer cannula does not roll off the table or similarly during or after use. Furthermore, the ribs can improve handling of the transfer cannula, particularly when connecting the containers and/or removing the containers, for example, after a transfer has been performed.

In the case of a movable mounting of the coupling wall on the mounting wall, it can further be provided that a rotationally fixed guide is provided in this regard. In this case, the coupling wall is correspondingly slidably displaceable relative to the mounting wall in the longitudinal direction of the line sections, and optionally, as is also preferred, is limited by stops in both directions of displacement. In the circumferential direction, however, with such a configuration, the coupling wall can be immovably bound to the mounting wall, so that a predetermined orientation in the circumferential direction can be maintained in every displacement position of the coupling wall.

For this purpose, the support wall can, for example, have at least one longitudinal slot, in which, for example, a radially inwardly pointing rib of the coupling wall can engage.

Furthermore, the rib/longitudinal slot interaction can, as is also preferred, provide guidance of the coupling wall during the sliding displacement.

In addition, several longitudinal slots can be provided distributed over the circumference of the support wall, which, if necessary within a group, can be arranged evenly distributed in the circumferential direction. Thus, according to a further possible embodiment, two groups of two, three or more longitudinal slots diametrically opposed in cross-section can be provided, wherein the longitudinal slots of a group can be evenly spaced from one another in the circumferential direction.

Along the edges of a longitudinal slot in the support wall, radially outwardly projecting ribs can be formed, extending in the longitudinal direction of the line sections, against which the coupling wall can be supported on the inside of the wall. By arranging several such ribs around the circumference of the support wall, a uniform radial spacing of the coupling wall from the support wall can be achieved.

With regard to the longitudinal extension of the line sections, a radially extending projection can be formed in the central region of the support wall, against which a displaceable coupling wall can rest when retracted. A center plane of this radially extending projection extending transversely to the longitudinal extension of the line sections can, in one possible embodiment, form a center or symmetry plane, from which a support and/or coupling wall can extend on either side.

The radially extending projection may also have a radial dimension, starting from a longitudinal center axis of the transfer cannula, that may exceed the largest radial dimension of the coupling wall in this regard.

Furthermore, this rib and/or each coupling wall can be designed non-circularly over the circumference, for example diametrically having opposing flat sections. The transfer cannula designed in this way is thus provided with a rolling prevention feature.

The ranges or value ranges or multiple ranges specified above and below also include all intermediate values with regard to the disclosure, in particular in 1/10 increments of the respective dimension, and may therefore also be dimensionless. For example, the specification 0.3 to 0.7 times also includes the disclosure of 0.31 to 0.7 times, 0.3 to 0.69 times, 0.31 to 0.69 times, etc., while the specification 1.2 to 2.5 times also includes the disclosure of 1.3 to 2.5 times, 1.2 to 2.4 times, 1.3 to 2.4 times, etc. This disclosure can serve, on the one hand, to delimit a stated range limit from below and/or above, but alternatively or additionally, to disclose one or more singular values from a respective specified range.

Short description of the drawings

Fig. 1

eine Überleitungskanüle in einer ersten Ausführungsform in Seitenansicht;

Fig. 2

die Draufsicht auf die Überleitungskanüle;

Fig. 3

die Überleitungskanüle in perspektivischer Darstellung;

Fig. 4

den Längsschnitt gemäß der Linie IV-IV in Figur 1;

Fig. 5

eine weitere Längsschnittdarstellung durch die Überleitungskanüle bei gegenüber der Schnittdarstellung in Figur 4 abweichender Schnittebene;

Fig. 6

in perspektivischer Explosionsdarstellung die Überleitungskanüle in einer zweiten Ausführungsform;

Fig. 7

die Seitenansicht hierzu;

Fig. 8

in perspektivischer Darstellung die Überleitungskanüle der zweiten Ausführungsform in einer auseinander gezogenen Grundstellung;

Fig. 9

die Seitenansicht hierzu;

Fig. 10

die Draufsicht auf die Überleitungskanüle;

Fig. 11

einen Längsschnitt durch die Überleitungskanüle gemäß der Linie XI-XI in Figur 9;

Fig. 12

eine weitere Längsschnittdarstellung durch die Überleitungskanüle bei gegenüber Figur 11 veränderter Schnittebene;

Fig. 13

eine der Figur 8 entsprechende perspektivische Darstellung, jedoch betreffend eine zusammengeschobene Nutzungsstellung der Überleitungskanüle;

Fig. 14

die Seitenansicht hierzu;

Fig. 15

eine der Figur 11 entsprechende Längsschnittdarstellung, jedoch betreffend die Nutzungsstellung gemäß Figur 13;

Fig. 16

eine der Figur 12 entsprechende Längsschnittdarstellung, jedoch betreffend die Nutzungsstellung gemäß Figur 13;

Fig. 17

den Schnitt gemäß der Linie XVII-XVII in Figur 16.

The invention is explained below with reference to the accompanying drawings, which, however, only represent exemplary embodiments. A part that is explained only with reference to one of the exemplary embodiments and is not replaced by another part in another embodiment due to the special feature highlighted therein is thus also described for this further embodiment as a possible part present at any rate. The drawing shows:

Fig. 1

a transfer cannula in a first embodiment in side view;

Fig. 2

the top view of the transfer cannula;

Fig. 3

the transfer cannula in perspective view;

Fig. 4

the longitudinal section along line IV-IV in Figure 1 ;

Fig. 5

a further longitudinal section through the transfer cannula with a different view than the section in Figure 4 different cutting plane;

Fig. 6

in perspective exploded view the transfer cannula in a second embodiment;

Fig. 7

the side view of this;

Fig. 8

in perspective view the transfer cannula of the second embodiment in an extended basic position;

Fig. 9

the side view of this;

Fig. 10

the top view of the transfer cannula;

Fig. 11

a longitudinal section through the transfer cannula along the line XI-XI in Figure 9 ;

Fig. 12

another longitudinal section through the transfer cannula at opposite Figure 11 changed cutting plane;

Fig. 13

one of the Figure 8 corresponding perspective view, but concerning a collapsed usage position of the transfer cannula;

Fig. 14

the side view of this;

Fig. 15

one of the Figure 11 corresponding longitudinal section, but concerning the usage status according to Figure 13 ;

Fig. 16

one of the Figure 12 corresponding longitudinal section, but concerning the usage status according to Figure 13 ;

Fig. 17

the section along the line XVII-XVII in Figure 16 .

Description of the embodiments

It is shown and described using a Figures 1 to 5 illustrated first embodiment and by means of a second embodiment, illustrated in the Figures 6 to 17 , a transfer cannula 1 for the sterile transfer of, for example, fluids to powders or fluids to fluids from a first container 2 into a second container 3.

The transfer cannula 1 has two line sections 4, 5 running in the same direction, with each line section 4, 5 forming an insertion tip 6 at one end.

In the longitudinal direction L of the line sections 4 and 5 extends a longitudinal central axis x of the transfer cannula 1. Essentially concentric to this longitudinal central axis x, the line sections 4 and 5 are initially surrounded at a radial distance by a first cylinder region Z ₁ , which first Cylinder region Z ₁ forms a support wall 7 for a closure region 9 of the container 2 or 3. Further coaxial to the longitudinal center axis x, at a radial distance from the first cylinder region Z ₁ , a second cylinder region Z ₂ is provided, which forms a coupling wall 8. With this coupling wall 8, the respective container wall 10 can be encompassed or supported in the corresponding assigned position, in particular during the transfer of, for example, a fluid from the first container 2 to the second container 3 or vice versa.

The two line sections 4 and 5 preferably extend essentially in a tube-like arrangement next to each other, so that the longitudinal center axis x can result between the line sections 4 and 5 in the area of the tangentially touching line walls (compare in particular the Figures 2 and 5 and 10 and 11).

Starting from a transverse plane E oriented transversely to the longitudinal central axis x, which can also represent a central or symmetry plane, the line sections 4 and 5 extend in the longitudinal direction L with different lengths a and b. Thus, as also shown, the line section having the insertion tip 6 at the end in this direction of extension can extend over a length a which corresponds approximately to 1.5 to 2.5 times, and further approximately to twice the length b of the other line section. This other line section with the shorter length b ends in a more blunt manner in this longitudinal direction compared to the insertion tip 6, and accordingly has at least approximately a wall running circumferentially in a cross-section transverse to the longitudinal central axis x in the opening plane.

The insertion tip 6, on the other hand, has an opening surface 29 enclosing an acute angle α of approximately 10 to 20 degrees, further approximately 15 degrees to a line parallel to the longitudinal central axis x.

In a mirror-symmetrical arrangement to the transverse plane E, the line section provided at one end with an insertion tip 6 opens at the other end into a blunt-like opening, while the line section provided with the blunt-like opening is longer beyond the transverse plane E and forms an insertion tip 6 at the other end.

A transverse wall 11 may be provided along the transverse plane E or, correspondingly, along a plane of symmetry. This wall supports the cannula unit resulting from the line sections 4 and 5 or is penetrated by them essentially centrally.

The support wall 7 can also be connected via this transverse wall 11. The support wall 7 can extend on both sides in the axial direction starting from the transverse wall 11 or the transverse plane E, wherein additional connection and stabilization can be provided via radial ribs 12. These radial ribs 12 can preferably be evenly distributed over the circumference with respect to the longitudinal center axis x. Thus, according to the Figures 1 to 5 illustrated first embodiment, four such radial ribs 12 may be provided or alternatively according to the second embodiment, six of them (see Figure 10 ).

The radial ribs 12 can preferably be connected both to the transverse wall 11 and to the inner wall surface of the support wall 7. Also with regard to the arrangement and design of the radial ribs 12 a symmetrical arrangement with respect to the transverse plane E can be given.

According to the Figures 1 to 5 In the first embodiment shown, the support wall 7 can be designed to be circumferentially closed, furthermore in particular in the form of a circular cylinder.

The coupling wall 8 can be connected to this first cylinder region Z ₁ or to this support wall 7 at a radial distance to the outside, this by arranging spacing radial ribs 13 between the support wall 7 and the coupling wall 8. These further radial ribs 13 can be provided in radial extension to the previously described radial ribs 12 between the line sections 4, 5 and the support wall 7.

The coupling wall 8 can, as is also preferred, have a substantially circular-cylindrical shape with ribs 14 arranged centrally on the outside of the wall, viewed in the longitudinal direction L, each extending in the longitudinal direction L, which are intended to serve as anti-roll protection before, during, or after use of the transfer cannula 1. Furthermore, these ribs 14 improve the handling of the transfer cannula 1 designed in this way.

Furthermore, the coupling wall 8 can, as is also preferred, be provided on both sides of the transverse plane E with recesses 15 extending substantially in the longitudinal direction L. These can also initially be of the form of an elongated hole, opening towards the free end edge 16. With reference to a plan view according to Figure 2 On both sides of the transverse plane E there is a diametrically opposite arrangement of two recesses 15.

As can be seen particularly from the presentation in Figure 1 As can be seen, a V-shaped widening in the direction of the end edge 16 can occur over the length c of each recess 15 viewed in the longitudinal direction L, approximately from half the length of the extension. In this case, the end region of the recess 15 facing the transverse plane E can have a Figure 1 considered width d, which can correspond to approximately 3 to 5 times a free inner diameter of a line section 4, 5, and moreover, for example, approximately 4 times.

The same side view according to Figure 1 The considered width e of the recess 15 in the outlet in the region of the end edge 16 can be approximately 1.5 to 2.5 times, furthermore approximately 2 times the width d. The recess 15 can be arranged with respect to a side view towards the transfer cannula 1, for example according to Figure 1 , starting from the end facing the transverse plane E, initially extend with a constant width d and then merge into a section which widens evenly up to the end edge 16, approximately in a V-shape.

The above-described length c of the recess 15, starting from the end edge 16, can further be dimensioned such that, as also for example from Figure 4 visible, the insertion tip 6 of one line section 4 or 5 with reference to a side view according to Figure 1 can be exposed in the recess 15.

Accordingly, the insertion tip 6 can, as is also preferred, protrude beyond the relevant end edge 17 of the support wall 7, while according to a preferred embodiment, the stump 18 of the other (shorter) line section 5 or 4 ends at an axial distance from this end edge 17 of the support wall 7 and accordingly can extend within the pot-like opening provided by the support wall 7.

As can be seen particularly from the sectional view in Figure 5 As can be seen, a length f, starting from the end edge 16 of the coupling wall 8 up to a plane oriented transversely to the longitudinal central axis x and touching the insertion tip 6, can correspond to approximately 0.8 to 1.2 times a length g of a line section 4, 5 which is circumferentially closed over the length g in a cross-section transversely to the longitudinal central axis x.

According to the first exemplary embodiment, the line sections 4, 5, the support wall 7 and the coupling wall 8, together with the ribs described further, can preferably be formed in one piece and from the same material, for example as a result of production using the plastic injection molding process.

In the Figures 6 to 17 In the second embodiment shown, however, only a one-piece and uniform material design of the line sections 4, 5 and the support walls 7, 7', which are also connected here via radial ribs 12, results.

In this embodiment, two support walls 7, 7' extend substantially symmetrically to the transverse plane E, each of which is assigned a coupling wall 8 or 8'.

The coupling walls 8, 8' are guided in the longitudinal direction L relative to the respective support wall 7, 7' so that they are displaceable but rotationally fixed.

For this purpose, the support walls 7, 7' can have longitudinal slots 19 running in the longitudinal direction L, which, according to the illustrated embodiment, can completely penetrate the support walls 7 and 7' respectively in the radial direction.

The longitudinal slots 19 extend in the longitudinal direction L, starting from the transverse wall 11, open at the edge, to the end edge 17 of the support wall 7, 7'.

As can be seen particularly from the sectional view in Figure 17 As can be seen, essentially two groups of longitudinal slots 19 can be provided, which groups can be located essentially diametrically opposite each other with respect to the longitudinal center axis x. Thus, three such longitudinal slots 19 can be provided per group, which are preferably evenly spaced from one another in the circumferential direction. The circumferential spacing between two consecutive longitudinal slots 19 of different groups can be selected to be greater than the circumferential spacing between two longitudinal slots 19 of the same group.

The longitudinal slots 19 are engaged by radially inwardly directed ribs 20 of the coupling wall 8 or 8' (compare Figure 17 ).

This rib/slot arrangement enables a rotationally fixed sliding displacement of the coupling walls 8 and 8' relative to the support wall 7, 7' and the line sections 4, 5.

Furthermore, spacer ribs 21 can be formed on the outside of the support wall 7, 7', flanking a longitudinal slot 19, which ensure the uniform radial distance between the coupling wall 8, 8' and the support wall 7, 7'.

The sliding displacement of the coupling wall 8, 8' relative to the support wall 7, 7' is preferably limited by stops in both displacement directions.

Diametrically opposite each other in the circumferential direction, each coupling wall 8, 8' can form two spring sections 27. The rib 20 assigned to the inside of each spring section 27 serves as a spreader 28, via which the respective spring section 27 can experience an elastically resilient displacement radially outward when a container 2, 3 is attached. The spring sections 27 can thus act via the spreaders 28 in a clamping manner on the container 2, 3, for example, on its container wall 10.

Pointing towards each other in one direction (retracted state), the coupling walls 8, 8' are abutted by a radially outwardly extended configuration of the transverse wall 11. The thereby formed, substantially circumferential projection 22 can, as also shown, project in the radial direction over the coupling wall 8, 8' (compare also for example Figure 15 ).

A safeguard against the transfer cannula 1 rolling off, for example when placed on a table surface or the like, can be provided by arranging diametrically opposite straight sections 23 which interrupt the otherwise circular outline of the projection 22.

In a pull-out direction of the coupling walls 8 and 8', a stop limit is provided due to the stop ribs 24 provided on the inside of the coupling wall 8, 8' striking the counter stop ribs 25 formed on the outside of the support wall 7, 7' (see Figure 12 ).

With reference to a plan view according to Figure 10 Radially projecting collar sections 26 can be formed on the outside of the coupling walls 8, 8', offset by 90 degrees from the straight sections 23 of the projection 22, in the region of their end edges 16. These collar sections 26 can serve as a retraction aid.

The transfer cannula 1, regardless of its design, can preferably be initially placed in a sterile foil bag or the like before first use. After removal from the foil bag, the containers 2 and 3 can be attached on both sides in such a way that the free ends of the line sections 4 and 5, with the aid of the insertion tip 6, penetrate the closure area 9, made, for example, of a rubber material, in such a way that the openings in the area of the insertion tip 6 and in the area of the stump 18, and thus the openings of both line sections 4, 5, can protrude freely into the interior of the container (cf. Figures 5 and 15 ).

The coupling wall 8, 8' surrounds the container wall 10, if necessary protectively, and in any case centering the arrangement.

With a movable arrangement of the coupling walls 8, 8', the transfer cannula 1 can first be placed in the extended, ie pulled-apart position, on a container 3, after which a container 2 can be placed from above on the opposite end of the line sections 4 and 5 is placed on top. The coupling walls 8 and 8', which have previously been moved into a telescopic position, provide guidance for the containers 2 and 3 during a loading downward movement of the upper (first) container 2, as a result of which its closure region 9 is pierced by the facing insertion tip 8, the holding wall 7, 7' together with the projection 22 is also displaced downwards and as a result the insertion tip 6 pointing towards the lower (second) container 3 is forced through the associated closure region 9.

As a result of the telescopic sliding of the support wall 7, 7' and the coupling walls 8, 8', a final transition position is obtained in which the insertion tips 6 also protrude beyond the planes of the end edges 16 of the coupling walls 8 and 8' (compare Figure 15 ).

During the transfer of liquid, for example, from the first (upper) container 2 into the second (lower) container 3, fluid transport is achieved via one of the line sections 4 or 5, while deaeration or ventilation is achieved via the other line section 5, 4. List of reference symbols 1 Transfer cannula 26 collar section 2 first container 27 spring section 3 second container 28 Spreader 4 Line section 29 Opening area 5 Line section 6 Insert tip 7 Support wall 7' Support wall a length 8 Coupling wall b length 8' Coupling wall c length 9 Closure area d Width 10 Container wall e Width 11 Transverse wall f length 12 radial rib G length 13 radial rib x Longitudinal center axis 14 rib 15 recess 16 Finishing edge 17 Finishing edge E transverse plane 18 blunt L Longitudinal direction 19 Longitudinal slot _Z1 first cylinder area 20 rib _Z2 second cylinder area 21 spacer rib 22 projection 23 straight section 24 Stop rib α angle 25 Counter stop rib

Claims (11)

1. A transfer cannula (1) for the sterile transfer of fluids to powders or fluids to fluids from a first receptacle (2) into a second receptacle (3), wherein said transfer cannula has two parallel tube sections (4, 5) that have different lengths in the longitudinal direction (L) of the tube sections (4, 5), wherein the longer tube section (4, 5) terminates in an insertion tip (6), wherein the tube sections (4, 5) furthermore are designed to be rigidly connected to a coupling wall (8) surrounding the tube sections (4, 5) in a cylindrical manner, wherein the coupling wall (8) has, associated with each insertion tip (6) and arranged oppositely on both sides with respect to the longitudinal direction (L) of the tube sections (4, 5), a cutout (15) that extends as far as a terminal edge (16) of the coupling wall (8), and wherein an insertion tip (6) of the tube sections (4, 5) is in a side view respectively exposed in said cutout, characterized in that the coupling wall (8) protrudes beyond the insertion tip (6) in the direction of the longitudinal extent (L) of the tube sections (4, 5), and in that the cutout (15) widens in a V-shaped manner at the terminal edge (16), the tube sections (4, 5) are surrounded by a first cylinder region (Z₁) for a closure region (9) of a receptacle (2, 3), wherein said first cylinder region forms a retaining wall (7), and in that the cutouts (15) are formed in a second cylinder region (Z₂) that is provided coaxial to the first cylinder region (Z₁) and forms the coupling wall (8), wherein said second cylinder region extends at a radial distance from the first cylinder region (Z₁).
2. The transfer cannula according to claim 1, characterized in that the transfer cannula (1) is realized mirror-symmetrical with respect to a central plane extending transverse to the longitudinal extent (L) of the tube sections (4, 5).
3. The transfer cannula according to one of claims 1 or 2, characterized in that an extent of the cutout (15) from the respective insertion tip (6) up to the terminal edge (16) of the coupling wall (8) corresponds to one-third or more of a length (g) of a circumferentially closed tube section (4, 5).
4. The transfer cannula according to one of the preceding claims, characterized in that the insertion tip (6) protrudes beyond a terminal edge (17) of the first cylinder region (Z₁), which extends transverse to the longitudinal direction (L) of the tube sections (4, 5).
5. The transfer cannula according to one of the preceding claims, characterized in that the first cylinder region (Z₁) is realized in a circumferentially closed manner.
6. The transfer cannula according to one of the preceding claims, characterized in that ribs (14) extending in the longitudinal direction (L) of the tube sections (4, 5) are formed on the outer side of the second cylinder region (Z₂).
7. The transfer cannula according to one of the preceding claims, characterized in that a coupling wall (8, 8') is retained in a displaceable manner on each of the retaining walls (7, 7').
8. The transfer cannula (1) according to claim 7, characterized in that the coupling walls (8, 8') protrude beyond the respective insertion tip (6) in the direction of the longitudinal extension of the tube sections (4, 5).
9. The transfer cannula according to one of claims 7 or 8, characterized in that the coupling wall (8, 8') is guided on the retaining wall (7, 7') in a rotationally fixed manner.
10. The transfer cannula according to one of claims 7 to 9, characterized in that the retaining wall (8, 8') has a longitudinal slot (19), wherein a rib (20) of the coupling wall (8, 8'), which is directed radially inward, engages into said longitudinal slot.
11. The transfer cannula according to one of claims 7 to 10, characterized in that a radially extending projection (22) is formed on the retaining wall (7, 7') in the central region with respect to a longitudinal extent (L) of the tube sections (4, 5), wherein the coupling wall (8, 8') can abut on said projection in the retracted state.