Instrument delivery device with nested housing

The invention provides a medical device comprising: an instrument having a proximal end and a distal end; an introducer configured to movably receive the instrument and having an outer housing having a proximal end, a distal end, and a sidewall therebetween, thereby defining an interior volume, and an inner housing having a proximal end, a distal end, and a sidewall therebetween, thereby defining an interior volume, the inner housing is slidably received within the outer housing, and a distal end of the introducer is configured to couple the introducer to an intravenous line. The inner housing is configured to be movable relative to the outer housing to move the instrument between a first position and a second position. 本发明提供一种医疗装置，其包括：器械，其具有近端和远端；导引器，其被构造为可移动地接纳所述器械并且具有外部壳体和内部壳体，所述外部壳体具有近端、远端和在近端和远端间的侧壁，从而限定内部容积，所述内部壳体具有近端、远端和在近端和远端间的侧壁，从而限定内部容积，所述内部壳体可滑动地容纳在所述外部壳体内，所述导引器的远端被构造为将所述导引器联接到静脉内管线。所述内部壳体被构造为能够相对于所述外部壳体移动，以使所述器械在第一位置和第二位置之间移动。