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:
Mar. 07, 1978
Filed:
Sep. 27, 1976
Ronald Gangemi, Huntington Beach, CA (US);
Other;
Abstract
An isolating and blood pressure transmitting apparatus for use in an extracorporeal blood treatment system or the like comprises a generally cylindrical, transparent plastic chamber with a housing having axially opposing inlet and outlet portions. The inlet portion is connected to a blood pumping and purifying portion of the system for receiving pressurized blood therefrom; the outlet portion is connected to a conventional pressure transducer which, in response to blood pressure transmitted thereto, controls blood pumping valving to maintain blood pressure in the system within predetermined limits. The chamber housing has a diameter and an axial length substantially greater than the diameter of the inlet and outlet portions, the chamber having an appreciable volume to absorb pressure surges. A thin flexible membrane, formed in a frustoconical shape is disposed across the housing to physically isolate the pressure transducer from the blood pumping and purifying portion of the system. A plurality of annular membrane wall segments, interconnected into a staircase-like structure, form the conical portion of the membrane and permit such portion to axially expand and contract or telescope in response to blood pressure variations at the inlet portion, pressure being thereby transmitted to the transducer through a pressure transmitting media. In extreme variations of blood pressure the conical membrane can turn inside out and sweep out major portions of the chamber volume, enabling use of the apparatus with very sensitive transducers. Axial portions of the conical membrane portion may be formed having an appearance contrasting with adjacent axial portions to enhance visual monitoring of membrane expansion and hence of blood pressure in the system. The membrane steps may be formed of varying thickness to provide non-linear expansion and contraction of the conical membrane portion in response to linear blood pressure variations at the inlet portion and to provide pressure surge protection for the transducer.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile