IMPLANTABLE WIRELESS SENSOR FOR IN VIVO PRESSURE MEASUREMENT AND CONTINUOUS OUTPUT DETERMINATION
摘要
A method and apparatus for determining cardiac parameters within the body of a patient includes a wireless sensor positioned in the patient's pulmonary artery. An external RF telemetry device communicates wirelessly with the sensor and interrogates the sensor to determine changes in pressure in the pulmonary artery over time. The peak pressure difference is determined. Then, assuming zero blood flow velocity at the time of valve opening and at the time of valve closing, a velocity-time function is determined. The velocity-time function is used to determine a velocity-time integral. The velocity-time integral is then used to determine cardiac stroke volume. The cardiac stroke volume is multiplied times the heartbeat rate to determine cardiac output. The cardiac output can be monitored over time to determine continuous cardiac output.
申请公布号
WO2007130628(A2)
申请公布日期
2007.11.15
申请号
WO2007US10927
申请日期
2007.05.04
申请人
CARDIOMEMS, INC.;STERN, DAVID;RALPH, STEPHEN;WHITE, JASON;KROH, JASON;MOORE, ERIK
发明人
STERN, DAVID;RALPH, STEPHEN;WHITE, JASON;KROH, JASON;MOORE, ERIK