Abstract: A catheter system which provides adjustability of the length of the guidewire extending distally from the distal tip of the catheter and/or allows the guidewire to be secured relative to the catheter hub to allow the guidewire and the catheter to be steered simultaneously. The catheter system may include a catheter having an elongate shaft defining a catheter lumen, a hub assembly coupled to the proximal end of the elongate shaft and including a hub assembly lumen, a torque assembly releasably coupled to the hub assembly and including a torque assembly lumen, and a guidewire co-axially disposed within the catheter lumen, hub assembly lumen, and torque assembly lumen. In a first configuration the torque assembly may be configured to simultaneously torque the elongate shaft and the guidewire and in a second configuration the torque assembly may be configured to torque the guidewire independent of the elongate shaft.

Abstract: The microcatheter may include an elongated shaft having a distal end and a proximal end. The elongated shaft may include an outer layer which may be formed from a polymer, a middle layer which may be formed of a braid having a plurality of strands having four filaments each, wherein the four filaments may be a round metal with an outer diameter of less than 0.0009”. The braid may achieve at least a 70% surface area coverage. The elongated shaft may include an inner layer which may be formed from a polymer, and a distal polymeric tip which may be attached to the distal end of the elongated shaft.