Patent ID: 7748275
Filing Date: 2010-07-06
Classification: A61M

Abstract:
1. A pressure sensor for an extracorporeal circulating circuit comprising: a liquid chamber, a pressure measuring means, and a liquid flow path, wherein the liquid chamber is provided with a reference plane which is not deformed by a pressure in the extracorporeal circulating circuit, a deformable plane which is disposed separately from the reference plane and is at least partially deformed by the pressure in the extracorporeal circulating circuit, a first connecting plane which connects the deformable plane with the reference plane to form a closed liquid-tight space therein and is not deformed by a pressure in the extracorporeal circulating circuit, a liquid flow inlet provided in a side surface of the first connecting plane, and a liquid flow outlet which is disposed at a position separated from the liquid flow inlet by a distance from more than one half to less than one of the inner circumference in the direction of a flow of a liquid wherein the liquid is introduced along an inner circumference of side surfaces of the first connecting plane; wherein the pressure measuring means is disposed outside of the liquid chamber for measuring a deformation quantity of the deformable plane; and wherein the liquid flow path is connected to the liquid flow inlet in a liquid tight manner so that the liquid introduced into the liquid chamber flows along the inner circumference of side surfaces of the first connecting plane.