GANAPATHY, ANAND;GREET, BRIAN;JOHN, MATHEWS;RAZAVI, MEHDI;BURKLAND, DAVID
发明人:
GANAPATHY, ANAND,BURKLAND, DAVID,JOHN, MATHEWS,GREET, BRIAN,RAZAVI, MEHDI
申请号：
CA3057085
公开号：
CA3057085A1
申请日:
2018.03.19
申请国别(地区):
CA
年份:
2018
代理人:
摘要：
A surgical instrument includes an impedance sensing system for monitoring the position of the tip of the surgical instrument relative to the pericardial space. The surgical instrument consists of a guidewire or needle including a conductive core terminating at a distal tip of the guidewire or needle. The distal tip has a conductive surface exposed to patient tissues and/or fluids. The impedance sensing system includes a first electrode formed by the exposed surface of the guidewire or needle, and at least a second electrode isolated from the conductive core of the guidewire or needle. The second electrode may be formed on an outer surface of the guidewire or needle, or may be a pad electrode applied to the patient skin. The impedance sensing system also includes an impedance analyzer for measuring impedance and phase using one or more frequencies.
