Patent ID: 11918795
Assignee: BARD ACCESS SYSTEMS, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 2:
3. A puncturing system configured to differentiate between a venipuncture and an arterial puncture, comprising:
a puncturing device including:
a needle including a shaft, a lumen defined by an inner diameter of the shaft, and a tip in a distal-end portion of the shaft;
a hub disposed over a proximal-end portion of the shaft; and
a capacitive pressure sensor disposed in the shaft of the needle configured to respond to changes in pressure from blood entering the shaft, the capacitive pressure sensor being a microelectromechanical system having a deformable diaphragm over a non-deformable substrate responsive to the changes in pressure; and

an external meter coupled to the capacitive pressure sensor configured to determine mean blood pressure from the changes in pressure received from the capacitive pressure sensor, compare the mean blood pressure to that expected for venous blood or arterial blood, and indicate whether the mean blood pressure is consistent with venous blood pressure or arterial blood pressure to differentiate between a venipuncture and an arterial puncture, respectively, the capacitive pressure sensor being configured to send to the external meter changes in capacitance corresponding to the changes in pressure.