Patent ID: 7462164

Claim:
A device for preparing a medicinal liquid by combining a first liquid substance contained in a first variable-volume chamber and a second substance contained in a second chamber, the device, comprising: a first and a second tubular bodies each open at one end and closed at the other end, the respective open ends of the first and second tubular bodies being conformed to be engaged one into the other for a sliding movement, a first and a second internal tubular supports held in position respectively with respect to the first and second tubular bodies, for holding respectively in position the first variable-volume chamber and the second chamber, a double-ended needle for allowing these chambers to communicated with each other, and a pusher for engaging means for varying the volume of the first variable-volume chamber, device wherein the first internal tubular support has a smaller-diameter rear section for holding the first chamber and a larger-diameter forward section corresponding to the inside diameter of the first tubular body, the double-ended needle is held in position between the forward confronting ends of the first and second chambers by a central partition of a tubular guide member through which the double-ended needle passes, said tubular guide member being in slide engagement on the one hand into the open end of the second tubular body, and on the other hand into a larger-diameter forward section of the first internal tubular support, the end of the larger-diameter forward section of the first internal tubular support forming a stop for limiting the sliding movement of internal tubular supports one with respect to the other to a first section of sliding movement corresponding to passage of the respective ends of the double-ended needle into the first and second chambers, the said pusher projecting inside from the closed end of the first tubular body, the wall of the first tubular body comprising elastic arms the internal surfaces of which are shaped to fit the first internal tubular support for connecting the first tubular body and the first internal tubular support and for preventing the first internal tubular support from sliding relative to the first tubular body, inclined surfaces formed inside said elastic arms to be engaged by the end of the second tubular body at the end of the first section of the sliding movement, for releasing the first internal tubular support from the first tubular body allowing a second section of the said sliding movement of the first tubular body with respect to the first internal tubular support, during which the pusher of the first tubular body pushes the means for varying the volume of the first variable-volume chamber for transferring a defined volume of liquid from the first chamber to the second chamber.