Patent Application
20050215943
The invention relates to a connector for packaging containing medical fluids, in particular infusion or transfusion bags, which serves to extract a fluid from the bag. Moreover, the invention relates to packaging for medical fluids, in particular an infusion or transfusion bag, with such a connector.
WO 96/23545 describes an infusion bag with an injection part and an extraction part. The injection part serves to feed a drug by means of an injection syringe. It comprises a tubular connection part, which is sealed by a protective cap designed as a break-off part. A self-sealing septum sits in the opening area of the connection part, whilst a membrane capable of being pierced is arranged in the connection part, so that the septum does not come into contact with the solution before the use of the infusion bag. The extraction part serves to extract the solution by means of a spike. The extraction part does not have a self-sealing septum, otherwise the structure is similar to that of the injection part.
A connector for the extraction of an infusion solution is also described in DE 197 28 775 C2. The tubular connection part of the known extraction part is sealed by a flat membrane, which is in one piece with the connection part.
The known extraction parts have been tried and tested in practice. A drawback, however, consists in the fact that the infusion bag is not sealed again after the spike has been withdrawn. There is therefore the risk of the infusion solution running out. This is particularly critical after the addition of cytostatic drugs.
A further drawback is that the connection between the spike and the extraction part is not secured against slipping out. When the bag is hanging on the stand, there is the risk of the connection of the spike arid the extraction part being separated due to unintentional tugging on the flexible-tube line.
There is also the drawback that the injected membrane, which seals the connection part of the extraction part, does not always withstand greater mechanical loads. Thus, it has been shown in drop tests that the membrane of individual extraction parts ruptured.
The problem underlying the invention is to provide a connector for packages containing medical fluid, in particular infusion or transfusion bags, which reliably seals the packaging after the withdrawal of the spike.
The solution to this problem takes place according to the invention with the features of claim 1. Advantageous forms of embodiment of the invention are the subject-matter of the sub-claims.
The connector according to the invention has a self-sealing membrane, which is arranged in the connection part for accommodating the spike for the extraction of the fluid. The self-sealing membrane prevents the fluid from running out of the packaging after withdrawal of the spike.
It is advantageous that the self-sealing membrane has a circular portion, which transforms into a dish-shaped portion, whereby the circular portion of the membrane surrounds the spike in a sealed manner when it pierces the dish-shaped portion.
The special formation of the membrane with the circular and dish-shaped portion on the one hand ensures that the spike is guided reliably when it pricks the membrane and on the other hand guarantees that the membrane is again reliably sealed after withdrawal of the spike even in the presence of relatively high internal pressure in the packaging. It has been shown in tests that the special formation of the membrane is decisive for immediate re-sealing, whereby the sealing of the membrane is further enhanced with increasing pressure in the packaging. The reliable sealing can be traced back not to the volume of material, but to the special geometry of the membrane.
In a preferred form of embodiment of the connector according to the invention, the material of the dish-shaped portion of the membrane is weakened, so that the membrane can be particularly easily pierced by the spike. The membrane is preferably pre-slit in the form of a cross. It can also be pre-slit in the form of a star or suchlike or only be provided with a simple slit.
In a particularly preferred form of embodiment, the tubular connection part of the connector consists of a lower and an upper section, whereby the sections are fixed in a snap-in manner. The self-sealing membrane is preferably held clamped with elastic deformation of the same between the lower and upper section. Consequently, the fitting of the connector can be carried out in a straightforward manner by pressing of the individual parts. It is however also possible for the individual parts to be welded and/or glued together.
A further particularly preferred form of embodiment makes provision such that an outer portion, which is clamped between the two sections, follows on from the circular portion of the membrane.
In order to prevent the self-sealing membrane in the tubular connection piece from coming into contact with the solution contained in the infusion and transfusion bag prior to the use of the latter, a second membrane capable of being pierced is preferably arranged beneath the self-sealing membrane thereby forming an intermediate space. The second membrane is expediently a one-piece component of the tubular connection piece.
It has been shown in tests that the use of a membrane curved upwards or downwards instead of a flat membrane leads to an increase in drop strength. Since the second membrane is designed curved upwards or downwards, the connector according to the invention withstands relatively great mechanical loads. Apart from the increase in drop strength, there is also the advantage that the spike in the pierced position is held clamped by the curved membrane. The retention force of the spike in the withdrawal position is thus increased, as a result of which unintentional slipping out is prevented.
In order to secure the upper and lower part of the connection piece against radial torsion, both parts can have toothing or suchlike, which also ensures precise alignment of the parts during pressing together. Furthermore, the risk of damage to the two membranes is especially low during the pressing together of the individual parts.
The break-off sealing part of the connector, which serves as an originality seal, is preferably connected to the connection part via a circular rupture zone.
Since the break-off sealing part preferably has a grip part, which is designed in the manner of an arrow pointing upwards, it can immediately be recognised that the connector is an extraction part, but not an injection part. Preferably, the arrow is a recess in the grip part, which is immediately recognisable without lettering or suchlike being necessary. Confusion between the extraction and injection part of a package containing medical fluids can thus be avoided.
The lower part of the connection piece also preferably has an arrow pointing upwards, which is designed as a raised structure, preferably in a recessed grip. The upward-pointing arrow of the lower connection-piece part also permits the connector to be unequivocally assigned as the extraction part after breaking-off of the sealing part.
An example of embodiment of the invention is explained in greater detail below by reference to the drawings.
The figures show the following:
Connector 20 designed as an extraction part for packages containing medical fluids, in particular infusion or transfusion bags, has a tubular connection part 1, which consists of a package-side lower section 2 and a connection-side upper section 3. Tubular connection part 1 therefore has an upper and a lower opening 1a, 1b. Connector 20 is an injection-moulded part made of polypropylene.
Lower section 2 of tubular connection part 1 has a lower cylindrical portion 4, which transforms into an upper sleeve-shaped portion 5. Cylindrical portion 4 of lower section 2 can be inserted into a connection socket of a film bag and can be welded or glued to the socket or be directly welded into the film bag without a socket. Cylindrical portion 4 is sealed at its upper end with a membrane 6 capable of being pierced, said membrane being a single-piece component of lower section 2. The injected membrane is curved downwards. Alternatively, however, the membrane can also be curved upwards.
Upper section 3 of tubular connection part 1 is fixed in a snap-in manner on lower section 2, whereby upper section 3 has a cylindrical portion 7 which surrounds lower section 2. The internal wall of cylindrical portion 7 of upper section 3 has a peripheral groove 8, into which a peripheral projection 9 on the outer wall of sleeve-shaped portion 5 of lower section 2 snaps when the two sections 2, 3 are pressed together.
A self-sealing membrane 10 made of an elastic material, which is also referred to as a septum, is held clamped with elastic deformation of the same between the lower and upper section 2, 3 of tubular connection part 1. Self-sealing membrane 10 has an outer portion 11, which is clamped between lower and upper sections 2, 3 of circular connection part 1. Outer portion 11 is followed by an upper circular portion 12, which transforms into a lower dish-shaped portion 14 thereby forming a trough-shaped recess 13 at the upper side of membrane 10. Dish-shaped portion 14 is pre-slit in the form of a cross or a star in centre 15, so that the elastic material is weakened, but is not severed.
Upper section 3 of tubular connection part 1 is followed, via a circular rupture zone 31, by a cap-shaped sealing part 16, which seals upper opening 1a of connection part 1. Sealing part 16 transforms into a flat grip part 17, which is provided with a recess 18 in the shape of an arrow 19 pointing upwards. It can immediately be recognised from the direction of arrow 19 that connector 20 is not injection part 40, but rather the extraction part.
The side view of connector 20 of
On the outer wall of cylindrical portion 7 of upper section 3, tubular connection part 1 of connector 20 has two recessed grips 21 lying opposite one another, which are each formed by projecting webs 22 which are arranged at a distance from one another. A further arrow 23, which also points upwards in order to identify connector 20 as the extraction part, is formed as a raised structure on the outer wall of cylindrical portion 7 between webs 22.
Infusion bag 21 comprises two film layers 24, which are welded together at lower and upper edge 25, 26 and also at longitudinal edges 27, 28. Two connections sockets 29, 30 are welded into upper edge 25 of the infusion bag. The tubular connection pieces of injection and extraction part 40, 20 are inserted into connection sockets 29, 30 and connected with the sockets during sterilisation. The tubular connection pieces of the originality seals can however also be moulded onto an insert that is round or designed in the manner of a boat, said insert being welded in between the two film layers.
Upper section 3′ of tubular connection part 1′ is again followed, via a circular rupture zone 31′, by a cap-shaped break-off part 16′, which transforms into a flat grip part 17′. An arrow 19′ pointing downwards is designed as a recess in grip part 17′. Arrows 23′ pointing downwards to indicate the flow direction are located on the outer wall of upper section 3′ again inside recessed grips 21′.
For the extraction of infusion solution, break-off part 16 of extraction part 20 is broken off by turning or breaking the same, so that self-sealing membrane 2 is laid bare. The spike of a known transfer system is pushed into tubular connection part 1 of extraction part 20, as a result of which pre-slit membrane 10 is pierced and membrane 6 curved downwards is penetrated. Trough-shaped recess 13 serves as a guide for the spike. The spike is sealed by circular portion 12 of membrane 10. On account of the special formation of injected membrane 6, the spike is held firmly in tubular connection part 1.
The infusion solution can then be extracted. When the spike is again withdrawn, self-sealing membrane 10 reliably seals extraction part 20 even in the presence of a relatively high internal pressure. Moreover, the mechanical strength of extraction part 20 is increased by the special formation of injected membrane 6.
Injection part 40 serves. to inject an active substance into the infusion solution. For this purpose, self-sealing membrane 10′ and injected membrane 6′ are again pierced with the injection needle of a syringe after removal of break-off part 16′. The injection part is again sealed after withdrawal of the needle.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102 23 560.0 | May 2002 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP03/01847 | 2/24/2003 | WO | 4/20/2005 |
