WO2009103251A4

WO2009103251A4 - Three -chamber automatic injector

Info

Publication number: WO2009103251A4
Application number: PCT/CZ2009/000021
Authority: WO
Inventors: Bohuslav Dolezal; Karel Ledvinica; Filip Behensky; Kamil Kuca; Daniel Jun; Jirí KASSA; Jan Dolezal
Original assignee: Vakos Xt A.S.
Priority date: 2008-02-22
Filing date: 2009-02-20
Publication date: 2009-10-29
Also published as: WO2009103251A1; SK500382010A3; SK288151B6; CA2714606C; EP2259817A1; CA2714606A1

Abstract

Injector allowing to mix, dissolve and apply medicine stored in mutually separated chambers consists of the body (1) where its inside contains a pushing mechanism and a part with three separated chambers (19, 18 and 30) with injection needle (16). The chambers (19, 18 and 30) are mutually separated by pistons (10, 11 and 12), the second chamber (18) contains bypass connection (29). In the third chamber (30), an injection needle (16) is fixed inside the guide cylinder (17) located below the third piston (12), and the guide cylinder (17) is equipped with bypasses (22) connecting the third chamber (30) with the entry of the injection needle (16). The third chamber (30) is equipped with the second section (21) with diameter by 5 to 10 % larger than diameters of the other chambers and is closed by end cap (13). The part with three separated chambers (19, 18 and 30) is formed by replaceable cartridge (7).

Claims

AMENDED CLAIMS received by the International Bureau on10 September 2009Amended Claims

1. Three-chamber automatic injector for mixing and application of medicine stored in a mutually separated chambers consisting of a pushing mechanism and a body of the injector where its inside space contains separated chambers filled with solutions and/or powder of pharmaceutically active substance with an injection needle, whereas before using of the injector the first chamber is closed from the top by the first piston, above which the pushing mechanism is located, and it is separated from the second chamber by the second piston, the second chamber contains a bypass connection of the second piston, the third piston mutually separates the second chamber and the third chamber where the injection needle is fixed inside a guide cylinder located below the third piston, the top part of the guide cylinder is equipped with bypasses connecting the third chamber with entry of the injection needle, the third chamber consists of the first section and the second section, diameter of the second section is by 5 to 10 % larger than diameters of the first chamber and the second chamber and its length is shorter than the sum of all three pistons' heights, the second section is in its bottom part under the point of the needle closed by end cap, characterized by the fact that the pushing mechanism consists of a pull-rod (2), a driving spring (3) and a safety lock (4), the safety lock (4) is placed at the top part of the bottom (27) of the inside space of the body (1), the driving spring (3) is put around the pull-rod (2), the pull-rod (2) in its top part is equipped with two catches (24 and 25) allowing the pull-rod (2) to fall gradually down through a aperture (28) created in the safety lock (4) into the first operating position and the second operating position, and a replaceable cartridge (7) is freely placed inside place the body (1) of the injector, the replaceable cartridge (7) consists of a hollow cylinder, which three pistons (10, 11 and 12) divide into three chambers (19, 18 and 30), the injection needle (16) located in third chamber (30) is fixed inside the guide cylinder (17) located below the third piston (12), the diameter of the guide cylinder (17) is smaller than diameter of pistons (10, 11 and 12), the bypass connection (29) of the second piston (11) in the second chamber (18) is formed in the inner wall of the hollow cylinder of the replaceable cartridge (7) and the third chamber (30) of the replaceable cartridge (7) is closed by end cap (13), whereas the inner body (1 ) at the bottom is closed by a screew stopper (6).

2. Three-chamber automatic injector according to claim 1 characterized by the fact that the safety lock (4) is covered by a cap (5), in which it moves in reciprocal motion, the cap (5) is firmly connected with the body (1).

3. Three-chamber automatic injector according to claim 1 characterized by the fact that the safety lock (4) is placed on the top part of the bottom (27) of the inside space of the body (1) rotationally and serves as a cap (5) at the same time.

4. Three-chamber automatic injector according to claims 1 to 3 characterized by the fact that the bypass connection (29) is formed by a segment created by a perimeter recess or a groove in the inner wall of the second chamber (18) of the replaceable cartridge (7) and has diameter larger than the diameter of the second piston (11).

5. Three-chamber automatic injector according to claims 1 to 3 characterized by the fact that the bypass connection (29) is formed by a segment with bypass channels (14) parallel with the body (1) axis, formed with slight recess (15) in axial direction in the inner enclosing wall of the replaceable cartridge (7).

6. Three-chamber automatic injector according to claims 1 to 5 characterized by the fact that the third piston's (12) front side is equipped with a hollow allowing to place the guide cylinder (17).

7. Three-chamber automatic injector according to claims 1 to 6 characterized by the fact that the end cap (13) touches the screw stopper (6), which is equipped with the aperture allowing the injection needle (16) to pass.