Injection devices comprising multiple sections, e.g., modular components, are disclosed. In some embodiments the injection system comprises an upper section comprising a compressed gas reservoir, and one or more lower sections, e.g., modular components, containing one or more compositions to be injected....http://www.google.fr/patents/US7740607?utm_source=gb-gplus-shareBrevet US7740607 - Modular units for use in an injection device
