Implantable arterio-venous shunt devices and methods for their use
A long-term implantable arterio-venous shunt device is provided that can be used as a therapeutic method. The shunt device is implanted between an artery and a vein, preferably between the aorta and the inferior vena cava. The shunt device decreases the systemic vascular resistance and allows a blood flow rate through the shunt device of at least 5 ml/min after the implantation. The blood flow rate could be controlled either via an open loop or a closed loop control means. The shunt device could also be a self-adjustable shunt device to self-adjust its structure to control the blood flow rate through its lumen. Based on the effects of the shunt device to the respiratory, cardiac and circulatory system, the implantable shunt device could be beneficial as a therapy to patients with problems or conditions related to these systems.
1. A therapeutic method comprising:
selecting a human subject suffering from chronic obstructive pulmonary disease; and
diverting a portion of an oxygenated blood flow from an arterial location to a venous location in the patient by way of a flow pathway between a peripheral vein and a peripheral artery, distal from the renal arteries, wherein said method provides increased cardiac output, lowered mean arterial blood pressure, and decreased systemic vascular resistance.
2. The method of claim 1 wherein the flow pathway has a length defined by the combined wall thickness of a human artery and a human vein.
3. The method of claim 1 wherein the flow pathway is created between the common iliac artery and vein.
4. The method of claim 1 wherein the flow pathway is created between the external iliac artery and vein.
5. The method of claim 1 wherein the flow pathway is created between the internal iliac artery and vein.
6. The method of claim 1 wherein the flow pathway is created between the femoral artery and vein.
7. The method of claim 1 wherein the flow pathway provides a blood flow rate in the range from 150 ml/min to 1500 ml/min.
8. The method of claim 1 wherein said method provides a lower mean arterial blood pressure by at least 5% compared to mean arterial blood pressure prior to the flow pathway creation.
9. The method of claim 1 wherein said method provides a decrease in the systemic vascular resistance by at least 5% compared to vascular resistance prior to the flow pathway creation.
10. The method of claim 1 wherein the subject is a human patient suffering from Chronic Obstructive Pulmonary Disease (COPD).
11. The method of claim 1 wherein the peripheral artery is selected from the group consisting of the axillary artery, the common iliac artery, the external iliac artery, the femoral artery, and the subclavian artery.
12. The method of claim 1 wherein mean cardiac output is increased by at least 5% compared to mean cardiac output prior to the creation of the flow pathway.
13. The method of claim 1 wherein the flow pathway so created has a length in the range of about 2.5 mm to about 15 mm.