Blood perfusion balloon catheter

• US 5,370,617 A
• Filed: 09/17/1993
• Issued: 12/06/1994
• Est. Priority Date: 09/17/1993
• Status: Expired due to Term

• Current Assignee: Harvinder Sahota
• Original Assignee: Harvinder Sahota
• Inventors: Sahota, Harvinder
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): MCDERMOTT, CORRINE MARIE
• Application Number:
  US08/123,128
• Time in Patent Office: 445 Days
• Field of Search: 604/93, 604/95, 604/96, 604/97, 604/98, 604/99, 604/101, 604/102, 604/103, 604/104, 604/53, 606/191, 606/192, 606/194, 606/195
• US Class Current: 604/102.02
• CPC Class Codes: A61M 2025/0004 having two or more concentrically arranged tubes for forming a concentric catheter system
• CPC Class Codes: A61M 2025/1097 with perfusion means for enabling blood circulation only while the balloon is in an inflated state, e.g. temporary by-pass within balloon
• CPC Class Codes: A61M 25/104 used for angioplasty

Abstract

Dilatation catheters for use in administering treatments to relieve stenotic regions within a body lumen while maintaining blood flow past the dilatation balloons are described. According to the present invention, perfusion ports are provided in both a guidewire lumen and in a bypass lumen in several alternative embodiments in order to provide increased blood flow past the dilatation balloon.

Claims

1. A dilatation catheter for relieving an obstructed coronary artery while maintaining a steady flow of blood past the obstruction, comprising:

an axially elongate catheter shaft,

a dilatation balloon secured to said catheter shaft, said dilatation balloon having a proximal end and a distal end;

a guidewire conduit in said catheter shaft, said guidewire conduit defining a guidewire lumen which traverses said dilatation balloon;

an inflation lumen in fluid communication with said dilatation balloon;

a perfusion lumen defined by said catheter shaft for providing a path through which blood may bypass said dilatation balloon when said balloon is in an inflated state and occluding said artery, said perfusion lumen separate from said guidewire lumen;

a plurality of catheter shaft influent perfusion ports disposed proximate to the proximal end of said dilatation balloon, said influent ports opening into said perfusion lumen so as to enable blood from said artery to enter said perfusion lumen;

at least one catheter shaft effluent perfusion port opening into said perfusion lumen, said catheter shaft effluent perfusion port disposed distal to the distal end of said dilatation balloon so as to conduct blood from said perfusion lumen back into said artery and maintain a steady flow of blood past said dilatation balloon during the dilatation process;

a plurality of guidewire conduit influent perfusion ports disposed near to said plurality of catheter shaft influent perfusion ports, said guidewire conduit influent perfusion ports opening into said guidewire lumen to as to enable blood from said perfusion lumen to enter said guidewire lumen to traverse said dilatation balloon; and

at least one guidewire conduit effluent perfusion port opening from said guidewire lumen into said perfusion lumen, said guidewire conduit effluent perfusion port disposed proximate to said at least one catheter shaft effluent perfusion port so as to conduct blood from said guidewire lumen back into said perfusion conduit.

2. A dilatation catheter for relieving an obstructed artery while maintaining a steady flow of blood past the obstruction, comprising:

an elongate tubular body;

a dilatation balloon secured to said tubular body, said balloon having proximal and distal ends;

an inflation lumen in fluid communication with said dilatation balloon;

a first conduit extending axially through at least a portion of said elongate tubular body for receiving a guidewire and extending through said dilatation balloon, said first conduit having a proximal end and a distal end;

a second conduit extending axially through at least a portion of the tubular body and extending through said dilatation balloon for allowing blood flow to bypass said dilatation balloon when said dilatation balloon is in an expanded state;

at least one second conduit influent perfusion port in fluid communication with said second conduit, said influent perfusion port disposed upstream from said dilatation balloon so as to enable blood from said artery to enter said second conduit;

at least one first conduit influent perfusion port in fluid communication with said first conduit, said first conduit influent perfusion port disposed near said at least one second conduit influent perfusion port so as to enable blood from said second conduit to enter said first conduit;

at least one second conduit effluent perfusion port in fluid communication with said second conduit, said second conduit effluent perfusion port disposed downstream from said dilatation balloon so as to conduct blood from said second conduit back into said artery and maintain a steady blood flow past said dilatation balloon during the dilatation process; and

at least one first conduit effluent perfusion port in fluid communication with said first conduit, said first conduit effluent perfusion port disposed proximate said second conduit effluent perfusion port and configured so as to conduct blood from said first conduit back into said second conduit.

3. The dilatation catheter of claim 2, wherein said at least one first conduit effluent perfusion port comprises an open end of said guidewire conduit, said open end being axially near to said distal end of said dilatation balloon.

4. The catheter of claim 2, wherein said at least one first conduit effluent perfusion port comprises a cutout in said distal end of said first conduit.

5. The catheter of claim 2, wherein said at least one first conduit effluent perfusion port further comprises a plurality of perfusion ports at said distal end of said first conduit.

6. The catheter of claim 2, wherein said second conduit effluent perfusion port comprises a cutout extending from an axial locating near to said distal end of said dilatation balloon and extending distally for at least a portion of the catheter shaft along a distal portion of said catheter shaft.

7. A dilatation catheter for relieving an obstructed coronary artery while maintaining a steady flow of blood past the obstruction, comprising:

an axially elongate catheter shaft, said catheter shaft having a proximal end and a distal end;

a guidewire lumen in said catheter shaft;

a dilatation balloon secured to said catheter shaft;

an inflation lumen in fluid communication with said dilatation balloon;

a perfusion lumen defined by said catheter shaft for providing a path through which blood may bypass said dilatation balloon when said balloon is in an inflated state, said perfusion lumen separate from said guidewire lumen;

at least one catheter shaft influent perfusion port disposed proximal to said dilatation balloon, said at least one influent port opening into said perfusion lumen so as to enable blood from said artery to enter said perfusion lumen;

at least one catheter shaft effluent perfusion port in said perfusion lumen distal said dilatation balloon so as to enable blood from said perfusion lumen to enter the artery;

at least one guidewire lumen influent perfusion port disposed proximal to said dilatation balloon so as to enable blood from said perfusion lumen to enter said guidewire lumen; and

at least one guidewire lumen effluent perfusion port distal said dilatation balloon so as to enable blood from said guidewire lumen to exit said guidewire lumen.

8. The dilatation catheter of claim 7, wherein said at least one guidewire lumen effluent perfusion port distal said dilatation balloon permits blood to exit said guidewire lumen and enter said perfusion lumen.

9. The dilatation catheter of claim 7, wherein said at least one guidewire lumen effluent perfusion port permits blood contained in said guidewire lumen to exit said guidewire lumen and enter the artery.

10. The dilatation catheter of claim 7, wherein said at least one catheter shaft influent perfusion port is proximate said at least one guidewire lumen influent perfusion port.

11. The dilatation catheter of claim 7, wherein said at least one catheter shaft effluent perfusion port is near said at least one guidewire lumen effluent perfusion port are proximate.

12. A method of relieving stenotic regions of a body lumen while maintaining a steady flow of blood distal to the stenotic region, said method comprising the steps of:

positioning a guidewire within a body lumen;

mounting an axially elongate dilatation catheter with a separate perfusion conduit and guidewire conduit on the guidewire by positioning the guidewire within the guidewire conduit;

advancing the dilatation catheter along the guidewire into the body lumen so as to position a dilatation balloon, attached to said axially elongate dilatation catheter, proximate said stenosis;

injecting a suitable pressurized fluid into said dilatation balloon via an inflation lumen to increase radially the size of said dilatation balloon so as to increase the size of said body lumen by radial expansion;

channelling blood through said perfusion conduit and through said guidewire conduit, both said perfusion conduit and said guidewire conduit traversing said dilatation balloon, so as to bypass said dilatation balloon;

deflating the dilatation balloon; and

withdrawing said dilatation catheter from said body lumen.