STEERABLE ULTRASOUND CATHETER

• US 20080172067A1
• Filed: 02/25/2008
• Published: 07/17/2008
• Est. Priority Date: 11/24/2003
• Status: Active Grant

• Current Assignee: Flowcardia Inc. (Becton, Dickinson & Co)
• Original Assignee: Flowcardia Inc. (Becton, Dickinson & Co)
• Inventors: Nita, Henry, Sarge, Jeff
• Granted Patent: US 8,668,709 B2
• Time in Patent Office: Days
• US Class Current: 606/127
• CPC Class Codes: A61B 17/22004 using mechanical vibrations, e.g. ultrasonic shock waves A61B17/225 takes precedence
• CPC Class Codes: A61B 17/2202 the ultrasound transducer being inside patient's body at the distal end of the catheter
• CPC Class Codes: A61B 17/320068 using mechanical vibrations, e.g. ultrasonic A61B17/22012 takes precedence; dental tooth drilling devices operated by vibration A61C3/03; removing intra-ocular material using mechanical vibrations A61F9/00745
• CPC Class Codes: A61B 17/3207 Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016
• CPC Class Codes: A61B 2017/00243 cardiac
• CPC Class Codes: A61B 2017/22014 the ultrasound transducer being outside patient's body; with an ultrasound transmission member; with a wave guide; with a vibrated guide wire not applied in A61B17/22012
• CPC Class Codes: A61B 2017/308 with suction cups
• CPC Class Codes: A61B 2017/32007 with suction or vacuum means
• CPC Class Codes: A61B 2017/320071 with articulating means for working tip
• CPC Class Codes: A61M 25/0054 with regions for increasing flexibility

Abstract

Ultrasound catheter devices and methods provide enhanced disruption of blood vessel obstructions. Ultrasound catheter devices generally include an elongate flexible catheter body with one or more lumens, an ultrasound transmission member extending longitudinally through the catheter body lumen and a distal head coupled with the transmission member and positioned adjacent the distal end of the catheter body for disrupting occlusions. Improved features of ultrasound catheters include catheter bodies and ultrasound transmission members with increasing distal flexibility, guidewire tubes allowing contact between a guidewire and an ultrasound transmission member, distal heads with improved guidewire lumens, and torquable proximal housings for enhancing disruption of blood vessel occlusions.

Claims

1. A method for disrupting an occlusion in a blood vessel, the method. comprising:

advancing an ultrasound catheter through a blood vessel having at least one bend, the catheter conforming concomitantly to the at least one bend, wherein advancing includes contacting an ultrasound transmission member of the ultrasound catheter with a guidewire at one or more locations within the catheter;

positioning a distal end of the ultrasound catheter adjacent an occlusion in the blood vessel; and

transmitting ultrasound energy to the ultrasound transmission member to disrupt the occlusion into multiple occlusion fragments, wherein transmitting includes transmitting ultrasound energy to the guidewire.

2. A method as in claim 1, further including removing at least some of the occlusion fragments from the blood vessel via the ultrasound catheter

3. A method as in claim 1, wherein the ultrasound catheter is advanced along the guidewire.

4. A method as in claim 1, wherein the guidewire is passed through the catheter.

5. A method as in claim 1, wherein the catheter and the guidewire are advanced together through the blood vessel.

6. A method as in claim 1, wherein the ultrasound catheter is advanced through at least one bend having a radius of about 1.0 cm or less.

7. A method as in claim 1, wherein the ultrasound catheter and the guidewire are advanced along multiple bends in the blood vessel, wherein a catheter body of the catheter, the ultrasound transmission member and the guidewire are sufficiently flexible to conform concomitantly to the multiple bends.

8. A method as in claim 1, further comprising applying radial force to a proximal housing of the ultrasound catheter to radially turn the distal end of the ultrasound catheter in the blood vessel.