A medical valve having an open mode that permits fluid flow, and a closed mode that prevents fluid flow, the medical valve comprising: a housing having an inlet to receive a medical implement and an outlet and characterized in that the medical valve further comprises:; a resilient member within the housing and having a body portion with a free state when undeformed by external mechanical forces and a deformed state when the valve is in the closed mode, the body portion being formed to radially expand to return toward the free state as the valve transitions from the closed mode to the open mode when pressed by the medical implement, the body portion having a distal aperture therethrough, the distal aperture biased toward an open state, the distal aperture being closed when in the deformed state to prevent fluid flow through the valve, the body portion defining at least part of a fluid path through the valve from the inlet to the outlet; and a control member located within the housing and at least in part containing the body portion, insertion of the medical implement causing the control member to radially expand and thereby allow the body portion to return toward the free state, and thereby transition the valve from the closed mode to the open mode. a housing having an inlet to receive a medical implement and an outlet and characterized in that the medical valve further comprises:; a resilient member within the housing and having a body portion with a free state when undeformed by external mechanical forces and a deformed state when the valve is in the closed mode, the body portion being formed to radially expand to return toward the free state as the valve transitions from the closed mode to the open mode when pressed by the medical implement, the body portion having a distal aperture therethrough, the distal aperture biased toward an open state, the distal aperture being closed when in the deformed state to prevent fluid flow through the valve, the body portion defining at least part of a fluid path through the valve from the inlet to the outlet; and a control member located within the housing and at least in part containing the body portion, insertion of the medical implement causing the control member to radially expand and thereby allow the body portion to return toward the free state, and thereby transition the valve from the closed mode to the open mode. a resilient member within the housing and having a body portion with a free state when undeformed by external mechanical forces and a deformed state when the valve is in the closed mode, the body portion being formed to radially expand to return toward the free state as the valve transitions from the closed mode to the open mode when pressed by the medical implement, the body portion having a distal aperture therethrough, the distal aperture biased toward an open state, the distal aperture being closed when in the deformed state to prevent fluid flow through the valve, the body portion defining at least part of a fluid path through the valve from the inlet to the outlet; and a control member located within the housing and at least in part containing the body portion, insertion of the medical implement causing the control member to radially expand and thereby allow the body portion to return toward the free state, and thereby transition the valve from the closed mode to the open mode.