Battery-Free Wireless Pressure Sensor for Intravascular Implantation Utilizing Changes in Electrical Boundary Conditions

A MEMS pressure sensor that can be implanted in a blood vessel has been used as a simple method for monitoring hemodynamics and detecting restenosis after a stent has been placed in the vessel. In this study, we successfully reduced the maximum dimensions to 40% or less compared to the conventional implantable MEMS sensor. This sensor utilizes electromagnetic waves for wireless energy transfer and signal detection, eliminating the need for a battery. Furthermore, this sensor detects changes in the electrical boundary conditions near the quartz resonator caused by pressure fluctuations as frequency shifts, enabling the simplification of its structure and successful miniaturization.