Patent ID: 6921153

Claim:
A liquid displacement assembly which comprises a first displacement member; a second displacement member, the first and second displacement members together defining a volume in which liquid is received, at least one of the first and second displacement members being movable with respect to the other to displace liquid from the volume; and a sealing formation positioned on each displacement member, the sealing formations being shaped so that a fluidic seal is interposed between the sealing formations when the liquid is received in the volume, each sealing formation having 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 being 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 and the sealing formations being shaped so that each liquid adhesion surface is interposed between the side surfaces of each respective sealing formation and the plane of reference.