Method and apparatuses for accessing and/or modifying a target patient tissue site

A modular dilation device, comprising:

• a first dilator, the first dilator having an elongate first dilator body and a first dilator distal end, the first dilator having a first dilator outer surface and a first dilator inner lumen, the first dilator having a first dilator side wall opening, the first dilator distal end having a first dilator open tip, the first dilator side wall opening selectively placing the first dilator outer surface in fluid communication with the first dilator inner lumen, the first dilator having a first dilator open slit, the first dilator open slit extending between the first dilator side wall opening and the first dilator open tip;
• and
• a second dilator, the second dilator having an elongate second dilator body and a second dilator distal end, the second dilator having a second dilator inner lumen, the second dilator distal end having a second dilator open tip;
• wherein when the second dilator is operatively joined to the first dilator the second dilator open tip is adjacent to the first dilator side wall opening.