Needleless connector having check valve with concave flow surface

A needleless connector, comprising:

• a housing having an upper portion comprising an inlet port, a lower portion comprising an opening, and an inner surface forming an inner cavity extending from the inlet port in a distal direction to the opening, the upper portion having a first section of opposing walls that extend distally at an angle radially inward, relative to a longitudinal axis of the housing, and a second section of opposing walls that are axially aligned with the first section of opposing walls and extend distally at an angle radially outward, relative to the longitudinal axis of the housing;
• and
• a compressible valve having a head portion and a compressible body portion extending distally from the head portion, the compressible valve positioned within the inner cavity and compressible between a closed state and an open state, wherein, in the closed state, a top section of the head portion is engaged against the inner surface to resist movement of a fluid between the inlet port and the inner cavity and comprises a top surface, and in the open state, the top section of the head portion is engaged against the first section of opposing walls that are angled radially inward such that the top section is pinched between two points on the first section of opposing walls to bias the top section of the head portion such that the top surface forms a concave shape and a fluid flow path is formed between the top section of the head portion and the inner surface.