Ultrasonic hypotube devices for treatment of CTOs and stenotic lesions

An ultrasonic catheter system, comprising:

• an ultrasonic transducer;
• an outer sheath having a first end, a second end, and a frustoconical side wall portion located proximal to the second end, and having a sheath lumen that extends from the first end to the second end;
• a hypotube ultrasonic transmission member disposed in the sheath lumen of the outer sheath, the hypotube ultrasonic transmission member having an exterior surface, a hypotube side wall, a proximal hypotube portion, a distal hypotube portion, and a tapered intermediate portion, the proximal hypotube portion being operatively coupled to the ultrasonic transducer, the proximal hypotube portion having a constant first diameter along the proximal hypotube portion, the distal hypotube portion having a constant second diameter along the distal hypotube portion that is less than the constant first diameter, and the tapered intermediate portion configured to transition from the constant first diameter of the proximal hypotube portion to the constant second diameter of the distal hypotube portion, and wherein the tapered intermediate portion is located proximate the frustoconical side wall portion of the outer sheath;
• and
• a guide wire tube connected directly to the exterior surface of the hypotube ultrasonic transmission member.

An ultrasonic catheter system, comprising:

• an ultrasonic transducer configured to produce vibrational energy;
• a catheter assembly comprising:
• an outer sheath having a first end, a second end, and a frustoconical side wall portion located proximal to the second end, and having a sheath lumen that extends from the first end to the second end;
• a hypotube ultrasonic transmission member disposed in the sheath lumen of the outer sheath, the hypotube ultrasonic transmission member having an exterior surface, a hypotube side wall, a proximal hypotube portion, a distal hypotube portion, and a tapered intermediate portion, the proximal hypotube portion being operatively coupled to the ultrasonic transducer, the proximal hypotube portion having a first diameter, the distal hypotube portion having a second diameter less than the first diameter, and the tapered intermediate portion configured to transition from the first diameter of the proximal hypotube portion to the second diameter of the distal hypotube portion, and wherein the tapered intermediate portion is located proximate the frustoconical side wall portion of the outer sheath;
• and
• a guide wire tube connected directly to the exterior surface of the hypotube ultrasonic transmission member,
• wherein the distal hypotube portion is configured for longitudinal, transverse, or longitudinal and transverse displacement in accordance with the vibrational energy, and
• wherein the hypotube ultrasonic transmission member includes a plurality of holes through the hypotube side wall at the distal hypotube portion to convert the vibrational energy received from the ultrasonic transducer into cavitation bubbles.