Injector having a cylinder-piston unit and permanently sterile active piston skirt
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United States of America Patent
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Mar 12, 2013
Grant Date -
Sep 29, 2011
app pub date -
Jun 3, 2011
filing date -
Dec 17, 2008
priority date (Note) -
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Abstract
A unidirectional injector having at least one cylinder-piston unit, the piston thereof being displaceable between two stroke end positions relative to the cylinder, wherein the cylinder-piston unit comprises at least one sealing system sealing a compensating space from the surroundings. To this end the piston is provided at its front surface with an axial annular groove for accommodating a seal ring or a permanently elastic seal material, that the cylinder is provided with a first seal element and a second seal element which are spaced by at least a piston stroke, or that the piston is provided with the first seal element and the second seal element which are spaced by at least a piston stroke, or the cylinder carries the first seal element and the piston carries the second seal element which is displaced with respect to the first by the piston stroke.
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