Multi-lumen catheter coupling

A transition device for providing fluid communication between a multi-lumen tube and an externally located infusion or withdrawal tube comprising:

• a tube having a first epidermal end which emerges from the epidermis of a patient into the external environment when the transition device is in place and a second subcutaneous end which is perpendicular to said first end and which is implanted int he patient when the transition device is in place;
• said subcutaneous end terminating in multiple nipples arranged in a circular conformation such that a cylindrical multi-lumen tube having a similar conformation may be fitted hermetically to said subcutaneous end over said nipples;
• multiple lumens running through the interior of said tube, said multiple lumens being separated by septa, said septa being recessed from said nipples;
• and wherein each of said multiple lumens is capable of being fluidly connected to a separate lumen in the multi-lumen tube;
• and wherein each of said multiple lumens is configured to be capable of accepting an externally located cylindrical infusion or withdrawal tube at said epidermal end and of maintaining a consistent hydraulic radius along the fluid path between said infusion or withdrawal tube and the multi-lumen tube.

A transition device for providing fluid communication between a multi-lumen tube and an externally located infusion or withdrawal tube comprising:

• a cylindrical multi-lumen tube;
• an infusion or withdrawal tube;
• a tube having a first epidermal end which emerges from the epidermis of a patient into the external environment when the transition device is in place and a second subcutaneous end which is perpendicular to said first end and which is implanted in the patient when the transition device is in place;
• said subcutaneous end terminating in two D-shaped nipples arranged in a circular conformation such that the cylindrical multi-lumen tube may be fitted hermetically to said subcutaneous end over said nipples;
• two lumens running through the interior of said tube, said lumens being separated by a septum, said septum being recessed from said nipples;
• each of said lumens being capable of accepting the cylindrical infusion or withdrawal tube at said epidermal end, the cylindrical infusion or withdrawal tube positioned to rest perpendicular to the epidermis of the patient and each of said lumens being configured to maintain a consistent hydraulic radius along the fluid path of the tube between the infusion or withdrawal tube and the multi-lumen tube.

A transition device for providing fluid communication between a multi-lumen tube and an externally located infusion or withdrawal tube comprising:

• a multi-lumen tube;
• an infusion or withdrawal tube;
• a tube having a first epidermal end which emerges from the epidermis of a patient into the external environment when the transition device is in place and a second subcutaneous end which is perpendicular to said first end and which is implanted in the patient when the transition device is in place;
• said subcutaneous end terminating in multiple nipples arranged in a circular conformation such that said cylindrical multi-lumen tube may be fitted hermetically to said subcutaneous end over said nipples;
• multiple lumens running through the interior of said tube, said multiple lumens being separated by septa, said septa being recessed from said nipples and wherein each of said multiple lumens is capable of being fluidly connected to a separate lumen in the multi-lumen tube;
• each of said lumens being configured to be capable of accepting the cylindrical infusion or withdrawal tube at said epidermal end and of maintaining a consistent hydraulic radius along the fluid path between said infusion or withdrawal tube and the multi-lumen tube;
• the cylindrical infusion of withdrawal tube positioned to rest perpendicular to the epidermis of the patient.