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:
Jan. 26, 1993
Filed:
Aug. 01, 1991
Masamitsu Sato, Akita, JP;
Masami Tanishima, Tokyo, JP;
Nihon Kohden Corporation, Shinjuku, JP;
Abstract
An internal pressure measuring catheter is constituted by at least three lumens which are: an internal pressure measuring lumen whose distal end is open and whose proximal end is connected to an internal pressure measuring transducer; a position correcting liquid-charged lumen whose distal end is closed, in which a liquid is charged, and whose proximal end is connected to a liquid pressure measuring transducer; and a position correcting atmosphere-opened lumen whose distal end is closed and whose proximal end is open to the atmosphere. The adjoining surfaces of the distal end portions of the liquid-charged and atmosphere-opened lumens have a small hole through which the charged liquid can be brought into contact with the atmosphere through the atmosphere-opened lumen. An internal pressure value is detected from the output signal of the internal pressure measuring transducer, and a head value corresponding to the height of the distal end of the charged liquid which is in contact with the atmosphere is detected from the output signal of the liquid pressure measuring transducer to correct the internal pressure value.