Chronic Access System for Extracorporeal Treatment of Blood Including a Continuously Wearable Hemodialyzer
0 Assignments
0 Petitions
Accused Products
Abstract
A patient wearable, continuously operating extracorporeal pump apparatus which accesses the patient'"'"'s arterial venous pressure differential by applying external pressure to a subcutaneous graft that has been cannualized to modulate blood flow through an extracorporeal circuit and to drive the pump for delivering a medicament, such as an anticoagulant, to the site of an intravenous cannula to prevent clogging thereof and also to move a dialysate through a circuit, including a dialyzer and a dialysate rejuvenating cartridge, whereby kidney failure can be treated without recourse to prior art hemodialysis machines found in most treatment facilities. With slight modification, the present invention can be used to remove excess fluids from CHF patients, to remove toxins from the blood in those suffering from liver failure and to facilitate administration of insulin to diabetics and/or glucose to those having hypoglycemia.
-
Citations
56 Claims
-
1-42. -42. (canceled)
-
43. A medical device for delivering metered quantities of a medicament into a patient'"'"'s vascular system comprising:
-
(a) a reservoir containing a medicament, the reservoir being in fluid communication with at least one percutaneous cannula via a compressible tube segment; and (b) an extracorporeal peristaltic pump having a roller coacting with the compressible tube segment and adapted to be powered by the patient'"'"'s arteriovenous pressure differential for moving the medicament through the at least one cannula. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 53, 54, 55, 56)
-
-
52. A method for obtaining access to a patient'"'"'s arteriovenous pressure differential comprising the steps of
(a) selecting a venous segment in the patient'"'"'s forearm and surgically debranching the selected venous segment and tying off the distal end thereof; -
(b) surgically anastomosing the distal end portion of the debranched vein to a selected artery in the patient'"'"'s forearm; (c) inserting a needle cannula percutaneously into the debranched vein segment; and (d) sequentially applying pressure to the forearm sufficient to substantially occlude blood flow through the debranched vein segment and releasing the pressure whereby when the pressure is being applied, the needle cannula is exposed to arterial pressure and when released, the cannula is exposed to venous pressure.
-
Specification