Abstract: A tissue-removing catheter for removing tissue in a body lumen includes an elongate drive member and a tissue-removing element operatively coupled to the distal end portion of the elongate drive member. An inner liner received within the drive coil defines a liner passage sized and shaped to receive a guidewire therein. A distal tip extends distally outward from the tissue-removing element. The distal tip has a proximal end portion disposed within the tissue-removing element and a distal end portion spaced distally from the tissue-removing element. A distal end portion of the inner liner is axially spaced apart from the proximal end portion of the distal tip such that the distal tip is free from direct connection to the inner liner.

Abstract: The present disclosure provides a tissue-removing catheter that includes an elongate body, a tissue-removing element, and an inner liner. The elongate body has proximal and distal end portions spaced apart from one another along an axis and is sized and shaped to be received in a body lumen. The tissue-removing element rotates by the elongate body to remove tissue. The inner liner is received within the elongate body, defines a guidewire lumen, and isolates an interior of the guidewire lumen from the elongate body and tissue-removing element, preventing torsional force from transferring from the elongate body and tissue-removing element to the interior of the guidewire lumen. The inner liner includes a distal end margin that may have a construction different from a construction of a second portion of the inner liner proximal of the distal end margin. The distal end margin may be more flexible than the second portion.

Abstract: The present disclosure provides a tissue-removing catheter that includes an elongate body with proximal and distal end portions, a tissue-removing element, an inner liner, and a coupling assembly. The tissue-removing element removes tissue by rotation from the elongate body. The inner liner defines a guidewire lumen received within the elongate body and is coupled to the tissue-removing element at its distal end portion. The coupling assembly includes a bushing attached to the distal end portion of the inner liner and a bearing disposed around the bushing with an exterior surface of the bushing contacting an interior surface of the bearing along less than 50% of an internal surface area of the interior surface of the bearing. At least one of the exterior surface of the bushing and the interior surface of the bearing may define a non-uniform dimension extending along a length of one of the bushing and bearing.