Implantable treatment reservoir

An implantable assembly comprising:

• A. an implantable device with an interior reservoir and exit port coupled thereto, said exit port defining a flow path from said reservoir along an exit axis,
• B. a catheter having a central passage and an entry port coupled thereto, said entry port defining a flow path to said central passage along a central axis,
• C. a coupling means for detachably coupling said exit port and said input port and selectively establishing a continuous flow path between said reservoir and said central passage with said exit axis and said central axis being coaxial, wherein said coupling means includes:
• i. twist-lockable connector surrounding said entry port of said catheter, said connector extending along said central axis and including a flanged portion adjacent to a base portion, said flanged portion including a flange extending radially outwardly with respect to said central axis, said flanged portion having a maximum dimension d.sub.1 in a first direction and a maximum dimension d.sub.2 in a second direction rotationally offset from said first direction about the central axis, and said base portion having dimensions essentially no larger than d.sub.1 in said first and second directions, said central axis being perpendicular to said first direction and said second direction,
• ii. a locking member affixed to said device, said member including a locking portion defining an opening extending along said exit axis, and adapted to receive said flanged portion of said connector, said opening having an input region large enough to permit passage of said flange portion therethrough and an interior region large enough to receive therein said flange portion at all angular orientations about said exit axis with said central and exit axes coaxial, said input region having a maximum dimension D.sub.1 in a third direction perpendicular to said central axis, where D.sub.1 is less than d.sub.2.