Combined medical device with sliding frontal attachment and retractable needle

A medical device comprising a frontal attachment, a connector housing, a fluid seal disposed between the frontal attachment and the connector housing, a forwardly projecting retractable needle, and at least one stop member;

• the frontal attachment and connector housing being maintained in closely spaced, laterally slidable relation to each other by structural elements connected to at least one of the frontal attachment and connector housing to provide a lateral sliding interface between the frontal attachment and connector housing that is at all points along the interface transverse to a longitudinal axis through the forwardly projecting retractable needle;
• the connector housing further comprising a needle retraction chamber, a needle retraction cavity, and a connector attachable to an associated medical apparatus, wherein the needle retraction chamber is coaxially aligned with the needle retraction cavity but is laterally offset from the forwardly projecting needle prior to needle retraction, wherein the connector is coaxially aligned with the forwardly projecting needle prior to needle retraction, and wherein a linear fluid flow path is established between the connector and the forwardly projecting needle prior to needle retraction;
• the at least one stop member being configured to restrict lateral sliding motion of the connector housing relative to the frontal attachment sufficiently to prevent accidental separation of the frontal attachment and the connector housing.