Patent ID: 7798989

Claim:
A needleless syringe comprising a body ( 2 ) that accommodates a cylindrical reservoir ( 3 ) which is closed off by a displaceable upstream obturator ( 4 ) and by a displaceable downstream obturator ( 5 ) and which encloses an active principle ( 6 ), and comprising, downstream of this, a receptacle ( 7 , 31 , 41 , 51 , 61 ) with at least one peripheral injection conduit ( 8 , 38 , 48 , 58 , 68 ), said receptacle bearing on the reservoir and comprising a bore ( 10 , 30 , 40 , 50 , 60 ) in which the downstream obturator ( 5 ) lodges when it is brought into contact with the bottom ( 7 a ) of the bore of said receptacle by the operation of a drive means ( 70 ) that displaces the assembly of upstream obturator, liquid and downstream obturator, said syringe being characterized in that the lateral wall of the bore comprises at least one protuberance reducing the cross section relative to the upstream opening of the bore, and in that the internal volume of said bore permits clearance of the inlets of the peripheral conduits when the downstream obturator is lodged in the bore ( 10 , 30 , 40 , 50 , 60 ).