The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 1990
Filed:
Apr. 13, 1989
Perry W Guinn, Idaho Falls, ID (US);
CD Medical, Inc., Miami Lakes, FL (US);
Abstract
A dialysis apparatus includes a series blood circuit that extends from a single needle through a hemodialyzer and back to the needle. Extending from this circuit is a single ended arm that includes a pump and a blood accumulation chamber. The pump is cyclically operated in opposite directions (in cooperation with associated valves) to alternately withdraw blood from the patient to the chamber and to expel blood from the chamber back to the patient. During one of these operations, blood flows through the dialyzer. By hydraulically isolating the pump and expansion chamber from the series blood circuit, the apparatus avoids large pressure swings and the attendant ultrafiltration that can occur with other single needle systems.