PRESSURE TRANSDUCER

• US 3,713,341 A
• Filed: 05/03/1971
• Issued: 01/30/1973
• Est. Priority Date: 05/04/1970
• Status: Expired due to Term

• Current Assignee: Jens Herman Jensen, Rud Frik Madsen
• Original Assignee: Jens Herman Jensen, Rud Frik Madsen
• Inventors: Madsen, Rud Frik, Jensen, Jens Herman
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US05/139,706
• Time in Patent Office: 638 Days
• Field of Search: 128/2.5D,2.5E,2.5A,2.5R 73/406,408 92/99,100
• US Class Current: 73/715
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61M 1/3639 Blood pressure control, pressure transducers specially adapted therefor
• CPC Class Codes: A61M 1/3641 Pressure isolators
• CPC Class Codes: G01L 7/00 Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements G01L11/004 takes precedence; transmitting or indicating the displacement of mechanical pressure-sensitive elements by electric , e.g., photoelectric or magnetic means G01L9/00; measuring differences of two or more pressure values G01L13/00; measuring two or more pressure values simultaneously G01L15/00

Abstract

In a blood pressure transducer a pressure compartment is sealingly closed by a plane diaphragm sensing the pressure of a liquid flowing through said compartment via inlet and outlet means. The pressure sensed is transmitted to a measuring device via a pressure transfer element.

Claims

1. A disposable blood pressure transducer useful in connection with the measurement of fluid pressure in an extracorporal dynamic liquid handling system, said transducer comprising:

a housing defining a pressure chamber, said housing including a pair of liquid connections communicating with the chamber for directing a continual flow of liquid into and out of the chamber and means defining a pressure transmission port communicating with said chamber;

a generally planar flexible diaphragm disposed across said port in liquid and pressure sealing relationship thereto, all portions of the housing and diaphragm in contact with said liquid being constructed of a synthetic plastic material;

a closure member engaging said diaphragm on the opposite side thereof from the chamber for maintaining the diaphragm in said fluid and pressure sealing relationship, said member defining a cavity opening toward the diaphragm and having an aperture opening away from the diaphragm; and

a pressure transfer element having a portion thereof disposed within said cavity proximal the diaphragm and an elongated projection extending away from the diaphragm and through the aperture, said pressure transfer element being loosely mounted in the cavity for at least limited completely free movement toward and away from the diaphragm relative to the latter and to the closure member, said pressure chamber and said fluid connections presenting a substantially unimpeded path for flow of liquid therethrough in either direction across the diaphragm.