Vladimir P. Nikolski,Linnea R. Lentz,Amy E. Thompson-Nauman,Teresa A. Whitman,Mark T. Marshall
申请号：
US16050626
公开号：
US20200038060A1
申请日:
2018.07.31
申请国别(地区):
US
年份:
2020
代理人:
摘要：
In some examples, a system includes a medical device comprising an elongate body configured to advance through layers of tissue of a patient, a lumen extending through the elongate body, a fluid line configured to supply fluid to the lumen, and a pressure sensor positioned within the lumen or the fluid line. The system may further include processing circuitry configured to receive, from the pressure sensor, a signal corresponding to the pressure of the fluid at each of a plurality of time points, determine, for each time point: a corresponding amplitude value of the signal, a difference between two amplitude values of the signal, an amplitude oscillation status of the signal, a position of the elongate body based on the difference and the amplitude oscillation status； and provide an indication of the position of the elongate body relative to the layers of tissue.
