the embodiment of a perforating connector of the invention shown in the figures comprises a hollow needle 1 with an axial fluid passage 1 a , and a needle support body 2 that surrounds and is fixed in a sealed manner to an intermediate section of the needle 1 , and which leaves projecting a first end section 3 and a second end section 4 of the needle 1 . the first end section 3 of the needle 1 is surrounded by a first tubular receptacle 5 closed by a first foil 6 . as a result , in an initial or transport position shown in fig1 , the first end section 3 of the needle 1 remains confined in a first cavity 7 delimited by the first foil 6 , by the first tubular receptacle 5 and by the body 2 . similarly , a second tubular receptacle 8 surrounds the second end section 4 of the needle 1 and is closed by a second foil 9 . as a result , in an initial or transport position shown in fig1 , the second end section 4 of the needle 1 is confined in a second cavity 10 delimited by the second foil 9 , by the second tubular receptacle 8 and by the body 2 . the first tubular receptacle 5 is conformed to be coupled to a first container to be connected , for example on being pressed axially against a foil or stopper of a first flask . similarly , the second tubular receptacle 8 is conformed to be coupled to a second container to be connected , for example by being pressed axially against a second foil or stopper of a second flask . the combination of the first foil 6 and the first tubular receptacle 5 is able to slide on the body 2 , so that the first foil 6 is movable axially relative to the needle support body 2 over a first piercing stroke c 1 : the first piercing stroke c 1 is defined as the movement in axial translation of the first foil 6 from an initial position , shown in fig1 , in which the first foil 6 is away from the body 2 and the needle 1 , to a final position , shown in fig2 , in which the first foil 6 has been moved toward the body 2 , the needle 1 has passed through the first foil 6 , and its end 3 a projects toward the exterior of the connector . similarly , the combination of the second foil 9 and the second tubular receptacle 8 is able to slide on the body 2 , so that the second foil 9 is movable axially relative to the needle support body 2 over a second piercing stroke c 2 ( fig3 ). the second piercing stroke c 2 is defined as the movement in axial translation of the second foil 9 from an initial position , shown in fig1 to 3 , in which the second foil 9 is away from the body 2 and the needle 1 , to a final position , shown in fig4 , in which the second foil 9 has been moved toward the body 2 , the needle 1 has passed through the second foil 9 , and its end 4 a projects toward the exterior of the connector . the two foils 6 and 9 are movable independently of each other toward and away from the body 2 . thus the first foil 6 is mounted on a first tubular receptacle 5 in the form of a first cylinder that slides on the body 2 with first sealed sliding means 5 a between them , for example a plurality of annular ribs on the body 2 . similarly , the second foil 9 is mounted on a second tubular receptacle 8 in the form of a cylinder that slides on the body 2 with sealed sliding means 8 a between them , for example a plurality of annular ribs on the body 2 . an external coaxial sleeve 11 is provided to constitute holding means for axially moving the body 2 toward the first foil 6 over a distance equal to the first piercing stroke c 1 , entraining the second foil 9 , and then moving the second foil 9 axially toward the body 2 and toward the first foil 6 over the second piercing stroke c 2 . to this end , the sleeve 11 comprises unilateral engagement means for pushing the body 2 axially toward the first foil 6 , so that the sleeve 11 effects the first piercing stroke in the direction of the body 2 , i . e . the stroke illustrated from fig1 to fig2 . during this first piercing stroke , the first foil 6 bears axially against a first container , so that it is subjected to a relative movement toward the body 2 over said first piercing travel . the unilateral engagement means then allow the sleeve 11 to effect a return stroke in the opposite direction to the first piercing stroke , away from the first foil 6 , i . e . to move from the fig2 position to the fig3 position . during this return stroke , the second foil 9 bears axially against a second container , and non - return engagement means on the sleeve 11 hold the second foil 9 fixed in position relative to the body 2 , allowing it to slide in the sleeve 11 . the unilateral engagement means then again allow axial movement of the sleeve 11 in the direction of the first foil 6 , over a second piercing stroke , from the fig3 position to the fig4 position , during which stroke the sleeve entrains the second foil 9 axially from its initial position toward its final position for piercing by the needle 1 . to allow these various movements , the sleeve 11 comprises a larger diameter first bore 12 in a first end section of the sleeve 11 , and delimited by a first shoulder 13 and a second shoulder 14 . the body 2 comprises a larger diameter annular rib 15 engaged in the first bore 12 of the sleeve 11 to allow relative axial movement of the sleeve 11 around the body 2 over an appropriate stroke equal to the first piercing stroke c 1 . in the end of stroke positions , the annular rib 15 abuts against the shoulder 13 or the shoulder 14 . also in order to allow the above movements , the sleeve 11 comprises a larger diameter second bore 16 in a second end section of the sleeve 11 , and delimited by a third shoulder 17 and a fourth shoulder 18 . the second foil 9 remains engaged in the second bore 16 and moves over an appropriate axial stroke equal to the second piercing stroke c 2 . the second bore 16 comprises an intermediate annular rib 19 with a sawtooth transverse profile having an non - inclined first face 20 and an inclined second face 21 . as may be seen in the figures , the first tubular receptacle 5 , in the form of the first cylinder , slides in the sleeve 11 . similarly , the second tubular receptacle 8 , in the form of the second cylinder , slides in the sleeve 11 . in the initial position shown in fig1 , the first cylinder projects out of the sleeve 11 , so that the first foil 6 has an external first face 6 a accessible for disinfection . similarly , in this same initial position , the second cylinder 8 is engaged in the sleeve 11 with the second foil 9 in the vicinity of the second end of the sleeve 11 , so that the external face 9 a of the second foil 9 is also accessible to the user for disinfecting it . to transport it , the connector is in the state shown in fig1 : the first tubular receptacle in the form of the cylinder 5 is away from the body 2 and projects out of the sleeve 11 , the first end section 3 of the needle 1 being confined in the first cavity 7 and set back from the first foil 6 . the second tubular receptacle 8 is engaged in the sleeve 11 in the vicinity of its second end , the second foil 9 being engaged between the fourth shoulder 18 and the intermediate rib 19 , and being away from the body 2 . the second end section 4 of the needle 1 is then confined in the second cavity 10 . after cleaning the two external surfaces 6 a and 9 a of the foils 6 and 9 , respectively , the foil or stopper of a first container is engaged against the first foil 6 , and the perforating connector is pushed by means of its sleeve 11 against the first flask , i . e . downward in fig1 . the sleeve 11 , which at this time bears on the annular rib 15 of the body 2 through the shoulder 14 , pushes the body 2 and the needle 1 downward , causing the first end section 3 of the needle 1 to pierce the first foil 6 and the foil or stopper of the first container . note that the shoulder 18 also entrains the second foil 9 over the same stroke , with the same movement as the body 2 , so that the needle 1 always remains set back from the second foil 9 . the sleeve 11 then performs a return stroke , as shown in fig3 . during this return stroke , the second foil 9 , which is held in axial bearing engagement against the foil or stopper of a second container , allows the intermediate rib 19 to move past it , because of the asymmetrical shape of the rib and elastic radial deformation of the rib 19 and / or the foil 9 , and engages under the non - inclined face 20 of the intermediate rib 19 . a second , downward axial movement of the sleeve 11 then entrains the second foil 9 downward , while the body 2 remains immobile with its rib 15 bearing against the first tubular receptacle 5 , which in turn bears on the first flask . the second foil 9 is then pierced . at the same time , the needle 1 pierces the foil or stopper of the second container , which is bearing against the second foil 9 . clearly , at no time is the atmosphere inside the needle brought into contact with the external atmosphere , and the connection is made under optimum sterilization conditions . moreover , the foils are pierced non - simultaneously by successive intentional actions of the user on the sleeve 11 , ruling out premature piercing . the present invention is not limited to the embodiments explicitly described but includes diverse variants and generalizations thereof that fall within the scope of the following claims .
a connector according to the invention comprises a hollow needle fastened to a body . a first tubular receptacle provided with a first foil surrounds a first end section of the needle . a second tubular receptacle provided with a second foil surrounds a second end section of the needle . the tubular receptacles are able to slide on the body . the holding sleeve moves the body toward the first foil over a first piercing stroke to pierce it , and then moves the second foil toward the body over a second piercing stroke to pierce it . in this way there may be obtained simultaneous piercing of the foils and foils or stoppers of containers such as flasks or sachets pressed against the foils , to provide a connection under optimum conditions of sterility .