Intravascular device utilizing fluid to extract occlusive material

• US 5,843,022 A
• Filed: 05/24/1996
• Issued: 12/01/1998
• Est. Priority Date: 10/25/1995
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Willard, Kevin C., Keith, Peter T.
• Primary Examiner(s): Coggins, Wynn Wood
• Assistant Examiner(s): Blyveis, Deborah
• Application Number:
  US08/655,335
• Time in Patent Office: 921 Days
• Field of Search: 604/96, 604/30, 604/101, 604/264, 604/280, 604/43, 606/192
• US Class Current: 604/30
• CPC Class Codes: A61B 17/22 Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for dilators A61M29/00
• CPC Class Codes: A61B 17/32037 for removing obstructions from inner organs or blood vessels, e.g. for atherectomy
• CPC Class Codes: A61B 2017/22067 Blocking; Occlusion A61B2017/22054 takes precedence
• CPC Class Codes: A61B 2017/22084 stone- or thrombus-dissolving
• CPC Class Codes: A61M 1/00 Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems catheters A61M25/00; tube connectors, tube couplings, valves or branch units specially adapted for medical use A61M39/00; devices for taking samples of blood A61B5/15; filters implantable into blood vessels A61F2/01
• CPC Class Codes: A61M 2025/1015 having two or more independently movable balloons where the distance between the balloons can be adjusted, e.g. two balloon catheters concentric to each other forming an adjustable multiple balloon catheter system
• CPC Class Codes: A61M 2025/1052 for temporarily occluding a vessel for isolating a sector
• CPC Class Codes: A61M 2025/1079 having radio-opaque markers in the region of the balloon
• CPC Class Codes: A61M 2025/109 having balloons for removing solid matters, e.g. by grasping or scraping plaque, thrombus or other matters that obstruct the flow
• CPC Class Codes: A61M 25/007 Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
• CPC Class Codes: A61M 25/10 Balloon catheters A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02; inflatable balloons for placing stents or stent-grafts A61F2/958 ; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00
• CPC Class Codes: A61M 25/1002 characterised by balloon shape A61M25/1006, A61M25/1009 take precedence
• CPC Class Codes: A61M 25/1011 Multiple balloon catheters

Abstract

An intravascular device and associated system which utilizes pressurized fluid to extract occlusive material. The device and system includes several unique features which provide desirable advantages over prior art devices. For example, the device is particularly suitable for removing occlusive material which is diffuse, friable, grumous-like, paste-like, granular, and/or chunky. The device includes independently movable fluid input and fluid output tubes and may be advanced over a guide wire. The fluid port holes are located immediately adjacent the distal end of the fluid output tube so as to engage the occlusive material without the need to first traverse the occlusive material with the device. The system utilizes a unique constant volume pump and associated pressure sensors to maintain balanced flow and immediately detect and correct conditions which may cause clinical complications.

Claims

1. A fluid extraction catheter for use in combination with a pressurized fluid system for the extraction of vascular occluding material, the catheter comprising:

a. an elongate extraction tube having a proximal end, a distal end, and an extraction lumen extending therethrough;

b. a fluid input tube coextending inside the extraction tube and longitudinally moveable relative thereto, the fluid input tube having a proximal end, a distal end, more than one port hole disposed adjacent the distal end and a fluid input lumen extending therethrough, wherein the port holes are directed at least partially outwardly and at least partially proximallly; and

c. an occluding balloon disposed on the extraction tube adjacent the distal end of the extraction tube.

2. A fluid system as in claim 1, wherein the port holes are directed at an angle to a lateral tangent line on an outer surface of the fluid input tube to create a spiral flow pattern.

3. A fluid extraction catheter for use in combination with a pressurized fluid system to extract vascular occluding material, the catheter comprising:

a fluid input tube having a distal end and more than one port disposed adjacent the distal end, the ports facing at least partially proximally and facing at least partially outwardly and directed at an angle to a lateral tangent line on an outer surface of the fluid input tube to create a spiral flow pattern and a fluid extraction tube moveably disposed about the fluid input tube, the extraction tube having a distal end; and

an occluding balloon disposed on the fluid extraction tube adjacent the distal end of the fluid extraction tube.