Medical Injection Device With Gas Evacuation

Abstract: An injection device (1) for injecting a medical liquid, comprising: - a piston (6) arranged within an inner space (4) delimiting an upper space (4b) and a lower space (4a), - an evacuation path, said evacuation path traversing the piston (6) the lower space (4a) to the upper space (4b) of the inner space, - a selector (24) between a lower portion (17a) and an intermediate portion (17b) of the evacuation path, configured for selectively allowing the gas to go through and preventing the medical liquid from going through said selector (24, 50, 60), - a purge valve (22) between the intermediate portion (17b) of the evacuation path and an upper portion (17c) of the evacuation path and configured for moving between a blocking and a passing configuration which requires an overpressure in the intermediate portion (17b) caused by the piston (6) travelling towards the lower end of the body (2).

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