Signal transmission tube with inverse initiation retention seal method

A detonator device of the non-electric type comprising:

• A. a detonator capsule 2 having a tubular elongated shape with an open end 13 and a closed end 13a and further including a first explosive charge 8 within said capsule 2, adjacent to said closed end 13a and at least one pyrotechnic delay train charge 9 adjacent to said explosive charge 8;
• B. a tube 3 for transmitting a shock wave signal having an internal continuous channel and an internal surface 3a with a predetermined amount of a second explosive composition impregnated thereon to effectively propagate said wave without destroying said tube, and said tube including first and second ends, said first end connected to at least one detonator of the non-electric type and a first predetermined portion of said tube 3 adjacent to said second end being housed within said capsule 2 with said second end in abutting contact with said at least one delay train charge 9 and a seal 12 for interrupting the continuous communication of the internal channel and preventing the transmission of an inverse shock wave in said tube 3 and said seal 12 being located at a first predetermined distance from said second end defining a second predetermined portion of said tube 3, said seal 12 being an expandable collapsed portion of said internal surface adjacent to said second predetermined portion thereby reducing the communication through said tube 3, and the amount of said second explosive in said second predetermined portion being insufficient to propagate said shock wave from said second end to said first end while permitting the propagation of said wave form said first end to said second end when ignited;
• and
• C. a plastic protective cover 5 around said capsule 2 at a third predetermined distance from said open end.