Patent EA-004092-B1 (EA)
Title: Injection device
Inventor: BERGERON LUC
IPC: A61M5/42
Filed: 2001-05-14
Abstract: 1. A handheld injection device comprising: an open cavity (2) having a rim (2a), the rim being capable of forming an airtight seal when applied to the skin of a patient; a needle (9) projecting into the open cavity (2), but not projecting beyond the rim (2a); a first piston (10) for containing a product to be injected being in communication with the with the needle (9); a second piston (11) for creating suction in the open cavity (2a), being in communication with open cavity (2); wherein withdrawal of the second piston (11) creates suction in the open cavity (2a), causing the patient's skin to be sucked into the cavity (2) and to be pierced by the needle (9), and actuation of the first piston (10) causes the product to be injected; characterised in that the first (10) and second (11) pistons are located within a cylindrical body (1), the cylindrical body having the needle (9) at one end and actuating means (13) for the pistons (10, 11) at another end. 2. A device according to claim 1, wherein said cylindrical body (1) comprises a first central cylinder (5) surrounded by a second annular cylinder (6) in which are located respectively said first (10), and second pistons (11). 3. An injection device comprising: an open cavity (2) the opening of which is delimited by an annular rim (2a) intended to be applied to the skin of a subject under treatment, an injection needle (9) projecting from the bottom of the cavity (2) its forward end being set back in relation to the said annular rim (2a) of the cavity (2), a first leakproof compartment (6) delimited by a first section of a mobile barrier (11), first means (13) for displacing the said first section of a mobile barrier (11) in order to vary the volume of the said first compartment (6), at least one passage (7) communicating between the first leakproof compartment (6) and the said cavity (2), a second leakproof compartment (5) for a product to be injected, delimited by a second section of a mobile barrier (10), second means (12) for displacing the said second section of a mobile barrier (10) in order to vary the volume of the second leakproof compartment (5) and an opening (8a) communicating between the second leakproof compartment (5) and the said injection needle (9), characterized in that the said first and second leakproof compartments (5, 6) extend longitudinally within a tubular body (1), that the said cavity (2) is located at one end of the tubular body (1), while the said first and second means (13, 12) for displacing the said first and second sections of a mobile barrier (11, 10) respectively of the said first and second leakproof compartments (5, 6) are accessible at the other end of the said tubular body(1). 4. A Device according to Claim 3, characterized in that the said second leakproof compartment (6) has an annular section surrounding the said second leakproof compartment (5). 5. A Device according to claim 3 or 4, characterized in that it includes elastic pressure devices (14) acting on the said second section of a mobile barrier (11) to increase the volume of the said second compartment (6) and locking elements (1a), a position in which the said elastic devices (14) are compressed, equivalent to the minimum volume of the said second compartment (6). 6. A Device according to Claim 5, characterized in that the said locking elements (1a, 13d) form one piece with both the said second devices (13) for displacing the said first section of a mobile barrier (11) and with the said tubular body (1). 7. A Device according to any one of claims 3 to 6, characterized in that each of the said first and second sections of a mobile barrier (11, 10) is formed by a piston sliding within its respective compartment (6, 5). 8. A Device according to any one of claims 3 to 7, characterized in that an annular wall (4a) extends concentrically around the portion of the said injection needle (9) which projects at the bottom of the said cavity (2), at approximately half the distance between the bottom and the forward end of the said injection needle (9).