Patent ID: 7618370
Filing Date: 2009-11-17
Classification: A61B,A61M,Y10S

Abstract:
1. A venous-arterial detector, comprising: a first chamber having first opening at a first end and a second opening in a wall thereof; a needle connected to and in fluid communication with the first chamber through the first opening; an indicator chamber pressurized before use to a defined pressure that is greater than a venous blood pressure and less than an arterial blood pressure, the indicator chamber being connected to the first chamber through the second opening in the first chamber, the first chamber and the indicator chamber being fixedly attached to one another; and a valve interposed between the first chamber and the indicator chamber so as to place the indicator chamber in selective fluid communication with the first chamber, the valve being constructed and arranged such that (1) the defined pressure within the indicator chamber cannot pass through the valve, and thus remains within the indicator chamber, and (2) fluid flowing from the first chamber toward the indicator chamber is permitted to pass through the valve; wherein blood entering the first chamber through the needle flows into the indicator chamber if the pressure of the entering blood is greater than the defined pressure within the indicator chamber.