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Machine translation
1. (WO1984004672) A PRESSURE BALANCING DEVICE FOR SEALED VESSELS
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

C L A I M S

1. A device for ventilating and pressure balancing the interior of a sealed vessel (1) containing a substance which is to be taken out from said vessel e.g. by an injection syringe, said vessel being provided with a closure means (2) comprising a sealing member (2) through which a puncturing member, e.g. a needle can be passed for entering the interior of said vessel,
c h a r a c t e r i z e d i n,
that said closure means (2) or a connection means (3) attachable onto said vessel is provided with ventilating means ( 10 ; 13 ; 14 , 15 ) arranged to provide a communication between the interior of the vessel (1) and a closed container (7 ; 18 ; 19) or alternatively the atmosphere via filter.

2. A device according to claim 1,
c h a r a c t e r i z e d i n,
that said container consists of a balloon (7) having extensible side walls and which in inflated condition exerts a counterpres sure on the volume of air contained therein.

3. A device according to claim 1,
c h a r a c t e r i z e d i n,
that said container consists of a bellows (18), piston-cylinder or the like , the volume of which is variable and which is pressure-less in both retracted and extended position.

4. A device according to claim 1,
that the volume of said container is constant.

5. A device according to any of the preceding claims,
c h a r a c t e r i z e d i n,
that said connection means (3) is provided with a hollow needle (11) arranged to penetrate the sealing member (2) of the vessel (1) when attaching the connection means to the vessel, said needle constituting said ventilating means

6. A device according to any of claims 1-4,
c h a r a c t e r i z e d i n,
that said connection means (3) is provided with a hollow pointed member (11) arranged to penetrate the sealing member (2) of the vessel (1) when attaching the connection means to the vessel, said pointed member having a passage (12) through which the interior of the vessel can be reached by said puncturing member, e.g. a needle, and a further ventilating passage (13) making a part of said ventilating means.