HK1142034B - Parison and method for the production of a receptacle used for holding liquids for medical applications - Google Patents

Description

The invention relates to a preform for the manufacture of a container for the reception of liquids for medical applications, in particular for the reception of infusion, transfusion or enteric nutritional solutions. The invention also relates to a process for the manufacture of a container for the reception of liquids for medical applications, in particular for the reception of infusion, transfusion or enteric nutritional solutions. The invention also relates to a container for the reception of liquids for medical applications.

A large number of containers of different types are known for the reception of liquids.

It is known that containers for medical liquids, such as bottles made of extruded PE or PP, are made sterile and pyrogen-free in a process by biaxial stretching and blow moulding of a preform, also known as preform, into the desired shape, are aseptically filled with a sterile filler after cooling and then hermetically sealed.

The well-known containers for infusion solutions or enteral nutritional solutions are generally suspended from a stand. For this purpose, the containers have a hanger. There are numerous containers known to have a hanger which is an integral part of the container. For example, EP 070 641 A1 and US 3 901 399 describe bottles with hangers moulded on the bottom. The hangers are shaped as eyelets to allow the bottle to be hung from a hook.

EP 0 483 671 B1 describes a method for producing an infusion container with a ring-shaped stopper at the bottom of the bottle. The bottle is made from a preform (preform) by biaxial stretching and inflation. The preform itself is made together with the ring-shaped stopper by injection moulding. The known manufacturing method is characterised by the fact that no further work step is required to attach a stopper after the blow moulding.

The purpose of the invention is to provide a preform that allows a container for receiving liquids for medical applications, in particular for receiving infusion solutions or enteric nutritional solutions, to be manufactured in a simple manner with a hanger. In addition, the purpose of the invention is to provide an easy-to-use process for manufacturing a container for receiving medical liquids that has a hanger. Another purpose of the invention is to provide an easy-to-make container for receiving medical liquids.

The solution of these problems is according to the invention with the features of claims 1 and 11.

The preform of the invention for the manufacture of a container for medical liquids, consisting of a neck part with an opening, a wall part and a bottom part, is characterised by the fact that at the bottom of the bottom part one end of a part of a suspended ring is moulded to suspend the container, the free end of the part being preferably capable of being connected to the bottom of the bottom part to the suspended ring by deformation.

The ring-shaped pendant can be circular or oval, but in principle, angular shapes are also possible, provided that the pendant is a closed ring.

The preform is first formed without the free end of the suspension being connected to the bottom of the bottom part of the suspension, and the container is then formed from the preform by stretching and blowing.

The preform itself is preferably produced by injection molding. The necessary process steps are also known to the professional. It is crucial that when the preform is injected the part of the suspension is not yet connected to the ground part. This simplifies the injection molding process for the production of the preform. A relatively high filling rate of the mould tool in the area of the suspension is obtained due to a better injection diameter through two small injection points, so that the cycle times are shortened. Furthermore, a precise wall thickness distribution and fast cooling and thus a more accurate loosening of the mould tool result. The entire volume of the bottle is used by the remover.

The suspension part may be connected to the ground part after the injection molding process, during the stretch blowing process or at a later stage at the customer's premises.

In the preferred embodiment of the preform, the part of the suspension is formed as a flexible strip; the mobility required to deform the part into the ring suspension can be achieved by selecting a material with sufficient flexibility and/or by appropriate dimensioning of the cross-section of the part.

The part of the hanger is preferably formed as a flat strip with a rectangular cross-section. This gives sufficient flexibility even for a less flexible material. In any case, the material should be so flexible that it does not break when bending. Instead of a rectangular cross-section, however, a circular cross-section is also possible.

In another preferred embodiment, the free end of the part and the floor are connected by a form-locking connection, preferably by a snap or a restraint connection, so that the connection can only be made at the customer's premises.

In principle, however, other connection techniques are also possible, for example, the free end of the suspension part can be welded or welded with the ground part.

The part of the hanger is preferably preformed into an oval shape, so that it can be easily deformed into the ring-shaped hanger. In principle, however, it is also possible to make the part essentially straight or only slightly curved.

Another particularly favourable embodiment is that the end of the part, which is moulded to the bottom of the floor, is formed as a base moulded to the bottom of the floor, which connects the free end of the part to the ring-shaped suspension by deformation of the same.

The following are examples of various embodiments of the invention, which are explained in more detail by reference to the drawings.

It shows: Fig. 1 an example of the cut-out of the preform of the invention,Fig. 2 a cut through the preform of Fig. 1,Fig. 3 an enlarged cut-out of Fig. 1 and a perspective of Fig. 1

Figures 1 and 2 show a cut-out example of the preform of the invention for the manufacture of a container for the reception of a medical liquid, in particular an infusion solution or enteric nutritional solution. The preform is produced by injection molding, in particular by injection molding, with two or three components of plastic, in particular polypropylene PP, polyethylene PE, PET or a combination of PP, PE, PET, which has sufficient stability. The preform has a hollow partition 1 with an opening 1A, fitted with an external winding 1B. At the neck partition 1 is joined to a wall partition 2 which is passed through a wall partition 3.

The bottom part 3 of the preform has a section 4 with a semicircular cross-section, at the bottom of which a plastic part 5 is formed, which later forms the hanger.

The plastic part 5 of the suspension has a flat base 5A, which is moulded to the bottom of the semicircular section 4 of the bottom part 3 and is therefore a single component of the bottom part. A flat part 5B is attached to one side of the base 5A, which is curved inwards towards an axis such that the free end of the part extends to close to the other side of the base 5A. The flat part 5B has a rectangular cross-section.

A rest or snap connection 6 allows the free end of part 5B to be connected to the base 5A in the form of a suspension with an essentially circular cross-section. The rest or snap connection includes a protruding aperture 7 at the free end of part 5B which can be fitted into a back-cut exception 8 in the base 5A, thus providing a form-locked spring and utility connection.

To secure the spring in the nut, the protruding approach 7 has a head 9 with a circular cross-section at the free end of part 5B which can be pressed into a hole 10 at the bottom of the base body 5A's exception 8 to create a button-like connection.

The hole 10 at the bottom of the 8th excerpt serves as a borehole to take in a notch that is shaped instead of the notch at the forward approach 7. The notch, which has a slightly smaller diameter than the borehole, is pushed through the borehole so that the notch protrudes from the borehole. To connect the two components, the overhanging end of the notch is deformed by machining in width to the so-called lock head, which securely connects the components. The machining can be done either by applying sudden pressure (shock) or continuous pressure (hot pressure) or by heat treatment of materials in such a way that they cannot be destroyed by the solvent or any other material, although the construction of the notch has a similar or similar force to that provided for in the previous section of the connection.

Figures 3 and 4 show the suspension in enlarged form before the attachment of the suspension part 5B to the base 5A. The parts to be connected are close together.

The container is formed from the preform by biaxial stretching and inflating according to the known processes. The shape of the suspension remains unchanged. Only after the injection molding is the part connected to the base body under the formation of the suspension. This simplifies the injection molding. The welding process is preferably carried out during stretching and inflating.

Claims (13)

1. A parison for the production of a receptacle used to hold liquids for medical applications, in particular to hold infusion solutions or enteral nutrient solutions, wherein the parison includes a neck part with an opening, a wall part and a bottom part, characterised in that one end of a section of an annular suspension device for suspending the receptacle is moulded onto the underside of the bottom part, the free end of the section being able to be connected to the underside of the bottom part to form the annular suspension device.
2. The parison according to claim 1, characterised in that the section of the suspension device is constituted as a flexible strip.
3. The parison according to claim 2, characterised in that the flexible strip is constituted as a flat strip with a rectangular cross-section.
4. The parison according to any one of claims 1 to 3, characterised in that the free end of the section of the suspension device and the bottom part can be connected to one another with a keyed connection.
5. The parison according to claim 4, characterised in that the keyed connection is a snap- in or catch connection.
6. The parison according to claim 4 or 5, characterised in that the free end of the section of the suspension device includes a shoulder and the bottom part includes an undercut recess, the shoulder of the section being able to be inserted into the undercut recess of the bottom part.
7. The parison according to claim 4, characterised in that the keyed connection is a riveted joint.
8. The parison according to any one of claims 1 to 7, characterised in that the section of the suspension device is preformed into an eyelet.
9. The parison according to any one of claims 1 to 8, characterised in that the end of the section of the suspension device moulded onto the underside of the bottom part is constituted as a base piece moulded onto the underside of the bottom part, with which the free end of the section can be connected such that said section is deformed and the annular suspension device is formed.
10. The parison according to claim 9, characterised in that the base piece is constituted as a flat body.
11. Production of a receptacle used to hold medical liquids, in particular to hold infusion solutions or solutions for enteral nutrition, with the following process steps:

    preparation of a parison in accordance with anyone of claims 1 to 10,

    stretching and blow-moulding of the parison to form a receptacle,

    connecting the free end of the section of the suspension device to the underside of the bottom part to form the annular suspension device.
12. The method according to claim 11, characterised in that the free end of the section of the suspension device is connected in a keyed manner to the underside of the bottom part.
13. The method according to claim 11 or 12, characterised in that the parison is produced by the injection moulding process.