Dispensing – With cutter and/or punch – To form dispensing opening in container
Patent
1983-01-05
1986-02-04
Rolla, Joseph J.
Dispensing
With cutter and/or punch
To form dispensing opening in container
222 89, 604408, 604411, B67B 748
Patent
active
045679991
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for providing a sealed liquid connection with the interior of a liquid container made of a flexible sheet material.
Packages of flexible sheet materials for liquids of various types have been widely used and have a number of advantages. Among various fields of use, packages for foodstuffs and various pharmacological preparations can be mentioned as examples, and among the many advantages it can be mentioned for example, that the packages are light, durable and can be produced in large numbers at a low price. Moreover, it is possible to produce and also to fill the packages under sterile conditions so that the sterility of the contents is assured. By a selection of suitable heat-resistant materials, the packages can also be heat sterilized with their contents.
One disadvantage of packages of flexible foil materials has been that it has often been difficult to make a connection to the package for drawing off its contents or adding a material to its contents. As the wall material of the package is flexible and without any great rigidity, it can be difficult to obtain a liquid-tight and leakproof connection. This problem will be still greater when at the same time the contents of the packages are to be kept sterile during and after tapping or at addition of material to the package. Soft packages of plastic foil have for example been widely used for solutions intended for intravenous infusion to a patient, and also for blood for transfusions. It goes without saying that an imperfect sterility of the package contents may have fatal consequences in such cases.
A connection to the interior of the container for supplying or drawing off liquid is mostly obtained in such a way that a point is made to penetrate the container wall so that a connection is obtained. In most cases, the point is hollow and can, for example, be the needle of a hypodermic syringe or of an infusion aggregate. Liquid is then drawn off or added through the channel in the needle, at which process several problems may occur. Such a problem is obtaining a safe seal where the needle penetrates the container wall. Another problem is obtaining a seal when the needle has been withdrawn after completed addition of liquid to the package, the packages mostly being made of a sheet material that has inferior self-sealing properties. This means that the sheet material is not sufficiently elastic to contract so that the hole is closed and sealing is obtained after withdrawal of the needle, but the resulting hole is still open so that leakage and bacterial contamination occur. Certain sheet materials, especially those based on rubber, have good self-sealing properties, but they are less suitable for the production of packages as they have unsuitable mechanical and optical properties, are difficult to heat-seal and are also difficult to sterilize.
There are also liquid packages of flexible sheet materials which already in their manufacture have been provided with passages of various types for supplying or drawing off liquid. Bag-shaped packages for infusion solutions can for example be provided with two passages, one having a rubber membrane for addition of liquid and the other being tubular for connection to an infusion aggregate for administration of the infusion solution to a patient. However, also such passages have disadvantages. Thus, the manufacture and handling of the packages will be much more troublesome and expensive than in the manufacture of simple "cushion packages". Besides, it may occur that several additions to the liquid in the package must be carried out before its use, and consequently the rubber membrane in the passage for additions must be penetrated with a hollow needle a number of times. This considerably increases the risk of rubber particles being released from the membrane and getting out into the solution. Moreover, the fixed passages will make it more difficult to arrange an outer protective bag around the package, which is often required to protect the package contents against light and penetrati
REFERENCES:
patent: 2704075 (1955-03-01), Cherkin
patent: 2856929 (1958-10-01), Gossett et al.
patent: 3172570 (1965-03-01), Lipschutz
patent: 3930286 (1976-01-01), McGowen
patent: 4022205 (1977-05-01), Tenczar
patent: 4381776 (1983-05-01), Latham
Bennwik Percy E.
Hjertman Birger T.
Handren Frederick R.
International Nutritional Research Institute AB
Rolla Joseph J.
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