White, Jason,Kroh, Jason,Stern, David,Ralph, Stephen,Moore, Erik
申请号：
AU2014200072
公开号：
AU2014200072A1
申请日:
2014.01.02
申请国别(地区):
AU
年份:
2014
代理人:
摘要：
#$%^&*AU2014200072A120140220.pdf#####ABSTRACT A method and apparatus for determining cardiac parameters within the body of a patient includes a wireless sensor positioned in the patients 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.WO 2007/130628 PCT/US2007/010927 1/16 10 12F 20 -2122 24 -19 15 16 18 14
