The present disclosure provides medical devices for creating a channel in a biological soft tissue. The devices comprise an integral rotatable tool formed by an elongated distal member and a proximal shaft the elongated member having a distal end portion and a proximal end portion the distal end portion comprising a tissue piercing tip of a pyramid like shape and the proximal end portion comprising an elongated prism like portion having at least three surfaces and respective prism edges with at least one of the prism edges between the surfaces being configured as a tissue cutting blade and the proximal shaft interfacing and extending from the prism like portion and having a cross section larger than a cross section of the prism like portion at the interface. In some embodiments the device comprises an intermediate portion extending between the distal end portion and the proximal end portion and having a frustum shape thereby forming a smooth transition between a base portion of the tissue piercing tip and the proximal end portion.
