Splitable tissue-cutting devices, assemblies, and methods

A tissue-cutting device, comprising:

• a body including a channel extending longitudinally between a distal end of the body and a proximal end of the body, wherein:
• the body includes a first body side coupled to a second body side via a longitudinally oriented hinge,
• the channel is disposed between the first body side and the second body side and is configured to receive a vascular catheter therein, the channel including a first diameter at the proximal end of the body and a second diameter at the distal end of the body, wherein the first diameter is greater than the second diameter,
• rotation of the second body side with respect to the first body side transitions the channel between a closed state and an open state,
• the vascular catheter is laterally constrained within the channel in the closed state, and
• the vascular catheter is laterally removable from the channel in the open state;
• and
• a tissue-cutting blade attached to the body, wherein the tissue-cutting blade:
• extends distally away from the distal end of the body, and
• extends laterally away from a longitudinal axis of the channel such that a cutting edge of the tissue-cutting blade is disposed opposite the longitudinal axis.