Infusion set and connector

A connector configured to be connected to an injection port disposed in a first infusion line, the connector defining a flow channel and comprising:

• a male connector end that is insertable into the injection port;
• a first female connector end to which a second infusion line is connectable;
• a second female connector end into which a male connector end of an additional connector that is identical to the connector is insertable;
• and
• a partition that extends into the male connector end and divides a portion of the flow channel into an in-flow channel and an out-flow channel,
• wherein the connector is configured such that, when the male connector end is inserted into the injection port, liquid is flowable from the injection port to the in-flow channel, from the in-flow channel around the partition to the out-flow channel, and from the out-flow channel back to the injection port, and
• wherein the connector is configured such that, when the male connector end of the additional connector is inserted into the second female connector end, the partition adjoins a partition of the additional connector.

A combination comprising:

• a first connector defining a first flow channel and comprising:
• a male connector end,
• a first female connector end, and
• a first partition that extends into an interior of the male connector and divides a portion of the first flow channel into an in-flow channel and an out-flow channel;
• a second connector defining a second flow channel and comprising:
• an upstream port to which a proximal portion of a first infusion line is connectable;
• a downstream port to which a distal portion of the first infusion line is connectable,
• a second female connector end into which the male connector end of the first connector is insertable, and
• a second partition that extends into an interior of the second female connector end and divides a portion of the second flow channel into an upstream flow channel and a downstream flow channel;
• wherein the first connector and the second connector are configured such that, when the male connector end of the first connector is inserted into the second female connector end of the second connector, the first partition cooperates with the second partition such that liquid is flowable from the upstream port to the upstream flow channel of the second connector, from the upstream flow channel of the second connector to the in-flow channel of the first connector, from the in-flow channel around the first partition to the out-flow channel of the first connector, from the out-flow channel of the first connector to the downstream flow channel of the second connector, and from the downstream flow channel to the downstream port of the second connector.