Liquid displacement assembly including a fluidic sealing structure

摘要

A liquid displacement assembly includes a first displacement member and a second displacement member. The first and second displacement members together define a volume in which liquid is received. At least one of the first and second displacement members is movable with respect to the other to displace liquid from the volume. A sealing formation is positioned on each displacement member. The sealing formations are shaped so that a fluidic seal is interposed between the sealing formations when the liquid is received in the volume. Each sealing formation has a liquid adhesion surface positioned between side surfaces of the sealing formation and directed towards a plane of reference oriented substantially orthogonally with respect to a direction of relative displacement of the sealing formations. The sealing formations are spaced from each other to define a region in which a meniscus can be formed so that opposed edges of the meniscus adhere to respective adhesion surfaces of the sealing formations. The sealing formations are shaped so that each liquid adhesion surface is interposed between the side surfaces of each respective sealing formation and the plane of reference.