A guide catheter comprising: an elongate tubular body with an outer diameter of no more than 0.0835 inches (2.1209 mm), an inner diameter of no less than 0.0715 inches (1.8161 mm), a proximal end, a distal end, and a total length therebetween; and a sole reinforcement tubular structure embedded in polymer (34, 38) between the outer diameter and the inner diameter of the elongate tubular body from the proximal end of the elongate tubular body to proximal to the distal end of the elongate tubular body, the sole reinforcement tubular structure made solely of a first plurality of elongate wire members and a second plurality of elongate wire members braided together in a braid configuration; wherein each of the first plurality of elongate wire members arranged in a counterclockwise helix about a central longitudinal axis of the elongate tubular body and having a first constant transverse cross-sectional shape, which first cross-sectional shape has a maximum thickness and a maximum width, the maximum width being at least three times as great as the maximum thickness and no more than four and a half times as great as the maximum thickness; and each of the second plurality of elongate wire members arranged in a clockwise helix about the central longitudinal axis of the elongate tubular body and having a second constant transverse cross-sectional shape, which second cross-sectional shape has a maximum thickness and a maximum width, the maximum width being at least two times a great as the maximum thickness and no more than three times as great as the maximum thickness; wherein the braid configuration is 2-over, 2-under; wherein the first plurality of elongate wire members comprises eight wire members and the second plurality of elongate wire members comprises eight wire members; and, wherein a braid pics per centimetre (ppc) is constant and is a value between 25.6 and 29.5 (65 and 75 pics per inch (ppi)). an elongate tubular body with an outer diameter of no more than 0.0835 inches (2.1209 mm), an inner diameter of no less than 0.0715 inches (1.8161 mm), a proximal end, a distal end, and a total length therebetween; and a sole reinforcement tubular structure embedded in polymer (34, 38) between the outer diameter and the inner diameter of the elongate tubular body from the proximal end of the elongate tubular body to proximal to the distal end of the elongate tubular body, the sole reinforcement tubular structure made solely of a first plurality of elongate wire members and a second plurality of elongate wire members braided together in a braid configuration; wherein each of the first plurality of elongate wire members arranged in a counterclockwise helix about a central longitudinal axis of the elongate tubular body and having a first constant transverse cross-sectional shape, which first cross-sectional shape has a maximum thickness and a maximum width, the maximum width being at least three times as great as the maximum thickness and no more than four and a half times as great as the maximum thickness; and each of the second plurality of elongate wire members arranged in a clockwise helix about the central longitudinal axis of the elongate tubular body and having a second constant transverse cross-sectional shape, which second cross-sectional shape has a maximum thickness and a maximum width, the maximum width being at least two times a great as the maximum thickness and no more than three times as great as the maximum thickness; wherein the braid configuration is 2-over, 2-under; wherein the first plurality of elongate wire members comprises eight wire members and the second plurality of elongate wire members comprises eight wire members; and, wherein a braid pics per centimetre (ppc) is constant and is a value between 25.6 and 29.5 (65 and 75 pics per inch (ppi)).