Intravascular pump and bypass assembly and method for using the same

• US 5,746,709 A
• Filed: 04/25/1996
• Issued: 05/05/1998
• Est. Priority Date: 04/25/1996
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Corace, Russell A., Rom, Paul F.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): Black, John M.
• Application Number:
  US08/638,020
• Time in Patent Office: 740 Days
• Field of Search: 604/8, 604/9, 604/96, 604/19, 604/151
• US Class Current: 604/8
• CPC Class Codes: A61M 1/3621 Extra-corporeal blood circuits single-needle circuits A61M1/30
• CPC Class Codes: A61M 1/3659 Cannulae pertaining to extracorporeal circulation
• CPC Class Codes: A61M 25/00 Catheters; Hollow probes dilators A61M29/00; peritoneal catheters A61M1/285; tracheal tubes A61M16/04; for drainage A61M27/00; for uterus, vagina or rectum A61M31/00 ; for measuring or testing A61B; materials for catheters A61L29/00
• CPC Class Codes: A61M 60/13 by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/237 the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
• CPC Class Codes: A61M 60/414 transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter
• CPC Class Codes: A61M 60/833 Occluders for preventing backflow

Abstract

An intravascular pump and balloon catheter assembly is shown. The assembly includes a primary catheter having a balloon provided thereon and an intravascular pump provided therein. The pump is adapted to generate a pressure differential between the inlet of the catheter and the outlet. With this structure, fluid is supplied, under pressure, to multiple arteriotomy cannulae provided at the terminal end of the assembly. The cannulae are inserted into blood vessels at appropriate points so that an occlusion or restriction in a blood vessel can be bypassed while still maintaining blood flow throughout the body.

Claims

1. An intravascular catheter assembly comprising:

a primary catheter comprising;

a body with a lumen formed therein;

a distal end adapted to be received inside a blood vessel;

a proximal end adapted to be positioned outside the blood vessel;

a fluid inlet fluidly connected to the lumen;

a fluid outlet fluidly connected to the lumen;

an inflatable member provided on the exterior surface of the body of the catheter, the member being selectively inflated between a retracted state and an inflated state, wherein the inflatable member in the inflated state creates an occlusion in the blood vessel;

an inflation lumen having a distal end fluidly connected to the inflatable member and a proximal end adapted to receive fluid from a suitable source; and

an intravascular pump provided in the lumen of the catheter intermediate the fluid inlet and outlet, the pump being adapted to create a positive fluid differential between the fluid outlet and the inlet; and

a plurality of subcatheters each having a proximal end, a distal end and a lumen formed therein, the subcatheter lumens being fluidly connected to the lumen of the primary catheter and adapted to receive fluid flowing therethrough, each of the subcatheters being adapted to be fluidly connected to one or more blood vessels downstream from the occlusion so that blood flow can continue through the blood vessels, despite the occlusion.

2. An intravascular catheter assembly according to claim 1 and further comprising a plurality of arteriotomy intercostal cannulae provided at the proximal end of each subcatheter, each arteriotomy cannulae comprising a body with a lumen formed therein, a proximal end and a distal end, the distal end being fluidly connected to the subcatheter lumen and the proximal end being received inside a blood vessel downstream from the occlusion so that fluid being expelled from the intravascular pump is supplied downstream to blood vessels.

3. An intravascular catheter assembly according to claim 1 and further comprising a plurality of arteriotomy cannulae provided at the proximal end of each subcatheter, each cannula comprising a body with a lumen formed therein, a proximal end and a distal end, the distal end being fluidly connected to the subcatheter lumen and the proximal end being received inside a blood vessel downstream from the occlusion so that fluid being expelled from the intravascular pump is supplied downstream to blood vessels.

4. An intravascular catheter assembly according to claim 1 wherein said intravascular pump comprises a rotor rotatably mounted inside the catheter, a drive mechanism provided a spaced distance from the rotor and a drive cable having a distal end mounted to the rotor and a proximal end mounted to the drive mechanism.

5. An intravascular catheter assembly according to claim 4 and further comprising a stator securely mounted inside the catheter, adjacent the rotor.

6. A method of providing blood flow around an occlusion in a blood vessel comprising the steps of:

providing a catheter assembly comprising;

a primary catheter comprising;

a body with a lumen formed therein, the body having a distal end adapted to be received inside a blood vessel, a proximal end adapted to be positioned outside the blood vessel, a fluid inlet fluidly connected to the lumen and a fluid outlet fluidly connected to the lumen;

an inflatable member provided on the exterior surface of the body of the catheter adjacent the distal end, the member being selectively inflated between a retracted state and an inflated state, wherein the inflatable member in the inflated state creates an obstruction in the blood vessel;

an inflation lumen having a distal end fluidly connected to the inflatable member and a proximal end adapted to receive fluid from a suitable source; and

an intravascular pump provided in the lumen of the catheter intermediate the fluid inlet and outlet, the pump being adapted to create a positive fluid differential between the fluid outlet and the inlet; and

at least one subcatheter having a proximal end, a distal end and a lumen formed therein, the subcatheter lumen being fluidly connected to the lumen of the primary catheter and adapted to receive fluid flowing therethrough, each of said at least one subcatheter being adapted to be fluidly connected to one or more blood vessels downstream from the occlusion so that blood flow can continue through the blood vessel, despite the occlusion;

inserting the distal end of the primary catheter into a blood vessel;

fluidly connecting the at least one subcatheter with a blood vessel downstream from the primary catheter;

actuating a the pump; and

supplying fluid to the inflatable member through the inflation lumen thereby causing the inflatable member to assume the inflated state;

whereby the occlusion is effectively bypassed through the fluid conduit extending between the primary catheter and the subcatheter.

7. A method of providing blood flow around an aortic aneurysm comprising the steps of:

providing a catheter assembly comprising;

a primary catheter comprising;

a body with a lumen formed therein, the body having a distal end adapted to be received inside the aorta, a proximal end adapted to be positioned outside the aorta, a fluid inlet fluidly connected to the lumen and a fluid outlet fluidly connected to the lumen;

an inflatable member provided on the exterior surface of the body of the catheter adjacent the distal end, the member being selectively inflated between a retracted state and an inflated state;

an inflation lumen having a distal end fluidly connected to the inflatable member and a proximal end adapted to receive fluid from a suitable source; and

an intravascular pump provided in the lumen of the catheter intermediate the fluid inlet and outlet, the pump being adapted to create a positive pressure differential between the fluid outlet and the inlet; and

at least one subcatheter having a proximal end, a distal end and a lumen formed therein, the subcatheter lumen being fluidly connected to the lumen of the primary catheter and adapted to receive fluid flowing therethrough, said at least one subcatheter being adapted to be fluidly connected to the aorta downstream from the aneurysm so that blood flow can continue through the aorta, around the aneurysm;

inserting the distal end of the primary catheter into the aorta, upstream from the aneurysm;

fluidly connecting the at least one subcatheter with the aorta downstream from the aneurysm;

actuating the pump; and

supplying fluid to the inflatable member through the inflation lumen thereby causing the inflatable member to assume the inflated state;

whereby the aneurysm is effectively bypassed through the fluid conduit extending between the primary catheter and the subcatheter.

8. A method of providing blood flow around an aortic aneurysm according to claim 7 and further comprising the steps of:

identifying any and all arteries extending from the aorta which are prevented from receiving blood flow; and

fluidly connecting a second subcatheter to one of said arteries.

9. A method of providing blood flow around an aortic aneurysm according to claim 7 and further comprising the steps of:

identifying any and all arteries extending from the aorta which are prevented from receiving blood flow; and

fluidly connecting a subcatheter to each of said arteries.

10. A method of providing blood flow around an aortic aneurysm according to claim 7 and further comprising the steps of:

clamping the aorta downstream from the distal end of the primary catheter, but upstream from the aneurysm; and

clamping the aorta upstream from the aneurysm, but upstream from the fluid connection point of the at least one subcatheter.

11. A method of providing blood flow around an aortic aneurysm according to claim 10 and further comprising the steps of;

identifying any and all arteries extending from the aorta intermediate the two clamps which are prevented from receiving blood flow; and

fluidly connecting a second subcatheter to one of said arteries.

12. A method of providing blood flow around an aortic aneurysm according to claim 11 and further comprising the step of fluidly connecting a subcatheter to each of said arteries.