Medication infusion set

A cannula housing for subcutaneous administration of a fluid, comprising:

• a projection,
• a first convex-shaped guide rail formed on a first external surface of the projection and adapted to mate with a first concave portion on a first guide arm on a connecting device,
• a second convex-shaped guide rail formed on a second external surface of the projection and adapted to mate with a second concave portion on a second guide arm on the connecting device;
• a first recess adapted to receive a first barb on a first locking arm that is included on the connecting device,
• a passageway formed through the projection;
• and
• a cannula adapted to be placed into the skin of a patient and in fluid communication with the passageway in the projection.

An infusion set for subcutaneous administration of a fluid, comprising:

• a cannula housing including
• a projection,
• a passageway formed through the projection,
• a first guide rail formed on a first external surface of the projection;
• a second guide rail formed on a second external surface of the projection,
• a cannula adapted to be placed into the skin of a patient and in fluid communication with the passageway in the projection;
• and
• a connector adapted to be connected to the cannula housing, the connector including
• a first guide arm having a first guide portion adapted to slide over the first guide rail,
• a second guide arm having a second guide portion adapted to slide over the second guide rail, and
• a first locking arm, wherein the first locking arm includes a first barb, and wherein the cannula housing further includes a first recess adapted to receive the first barb,
• wherein one of the first guide rail and the first guide portion is convex and the other is concave, and wherein one of the second rail and the second guide portion is convex and the other is concave.

An infusion set for subcutaneous administration of a fluid, comprising:

• a cannula housing including
• a projection,
• a passageway formed through the projection,
• a first guide rail formed on a first external surface of the projection;
• a second guide rail formed on a second external surface of the projection,
• a cannula adapted to be placed into the skin of a patient and in fluid communication with the passageway in the projection;
• and
• a connector adapted to be connected to the cannula housing, the connector including
• a first guide arm having a first guide portion adapted to slide over the first guide rail,
• a second guide arm having a second guide portion adapted to slide over the second guide rail,
• wherein one of the first guide rail and the first guide portion is convex and the other is concave, wherein one of the second rail and the second guide portion is convex and the other is concave, and wherein the projection contacts the first guide arm only at the first guide portion when the connector is connected to the cannula housing.