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:
Apr. 12, 2022
Filed:
Dec. 17, 2017
Fresenius Medical Care Deutschland Gmbh, Bad Homburg, DE;
Fresenius Medical Care Duetschland GmbH, Bad Homburg, DE;
Abstract
The invention relates to a positive displacement pumpfor conveying medical fluids, which pump has a pumping chamberand a positive displacement element, and to a blood treatment apparatus comprising a positive displacement pump. In addition, the invention relates to a method for controlling a positive displacement pumpfor conveying medical fluids. The positive displacement pumpaccording to the invention has an actuation memberin operative connection with the positive displacement elementfor displacing or deforming the positive displacement element in order to convey the fluid into the pumping chamber or out of the pumping chamber, and a drive devicefor displacing the actuation member. A control unitis provided for to controlling the drive deviceand an inlet valveand outlet valve. The actuation memberis in operative connection with the positive displacement elementvia a working chamberthat is filled with gas and has a sealed volume. In order to achieve a high conveying precision, the pressure in the working chamberis kept constant when the positive displacement elementis moved.