Microfabricated catheter having an intermediate preferred bending section

A method of accessing a targeted vessel via the aortic root, the method comprising:

• providing an interventional device comprising:
• an elongated member extending between a proximal end and a distal end, the elongated member including a proximal section having a microfabricated region with a first cut arrangement with cuts arranged on multiple sides, a distal section having a microfabricated region with a second cut arrangement with cuts arranged on multiple sides and that provides greater flexibility than the first cut arrangement, and
• an intermediate section between the proximal section and the distal section and that has a proximal-intermediate section extending distally from the proximal section and a distal-intermediate section extending proximally from the distal section,
• wherein the proximal-intermediate section includes a microfabricated cut arrangement with cuts arranged on a single side to leave a resulting spine and to enable preferential flexing in one plane, and
• wherein the distal-intermediate section omits microfabricated cuts and is more rigid than the proximal-intermediate section and the distal section;
• routing the distal end of the interventional device to the aortic root;
• and
• positioning the device such that the proximal-intermediate section abuts an aortic wall at a contact point and forms a bend, and such that the distal-intermediate section extends across the aortic root away from the contact point and towards a targeted vessel to enable the distal section entry into the targeted vessel.