US 6,981,961 B1
Needleless syringe comprising an injector with nested elements
Alain Navelier, Pierrefeu du Var (France); Patrick Alexandre, Gray (France); Bernard Brouquieres, Toulon (France); and Claude Mikler, Dijon (France)
Assigned to Crossject, Paris (France)
Appl. No. 10/18,133
PCT Filed Jun. 30, 2000, PCT No. PCT/FR00/01851
§ 371(c)(1), (2), (4) Date Dec. 18, 2001,
PCT Pub. No. WO01/05454, PCT Pub. Date Jan. 25, 2001.
Claims priority of application No. 99 09252 (FR), filed on Jul. 16, 1999.
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 5/30 (2006.01)
U.S. Cl. 604—68 11 Claims
OG exemplary drawing
 
1. A needleless syringe for injecting an active principle, comprising:
an injector including at least one injection nozzle, said injector being placed a distal end of the needleless syringe; and
a wall that can be displaced under the effect of a propulsive system pressurizing and expelling the active principle through the injector, wherein:
the active principle is initially placed between the injector and the wall, and
the injector includes an assembly of at least two elements; each of said elements having a downstream face, an upstream face and a lateral surface joining said elements together, the lateral surfaces of said elements in the assembly being at least partly in contact with each other to define contacting surfaces; at least one of the lateral surfaces having at least one groove which constitutes the injection nozzle in the assembly of said elements; and the injection nozzle being located between the lateral surfaces.