| 摘要 |
<p>An implantable device grafted directly to vascular structures for high volume blood and/or fluid infusion and/or removal for such purpose as hemodialysis, apheresis, exchange transfusion, or large volume fluid infusion. The device is also adaptable to intermittent access to the venous or arterial circulations for purpose of blood sampling or giving medications. The device is comprised of an implantable fluid chamber (25) connected to a cannula (15) which is then grafted directly to the vascular structure (e.g. artery or vein). The vascular end of the cannula (15) employs a valve (17) to prevent reflux of blood and subsequent washout of anticaogulant during periods when the device is not in use. The device is accessed percutaneously through a replaceable diaphragm (27) with a needle or needle-introduced catheter. The implantable fluid chamber (25) and cannula (15) are filled with anti-coagulant prior to needle withdrawal to prevent thrombosis.</p> |
