Patent ID: 11918320
Assignee: UNIST (ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY)
Field: Medical technology (Instruments)
Classification: CPC A  H | IPC A  H

Claim 0:
1. A system for measuring biometric information comprising:
an implantable device inserted into a body and configured to measure biometric information; and
an external device configured to transmit a signal to the implantable device, wherein the signal's frequency is constantly changing based on a given interval from a frequency of GHz by sweeping a frequency, wherein the external device comprises a phase-locked loop configured to sweep the frequency in order to drive the EM-based sensor included in the implantable device;
wherein the implantable device comprises:
an electro-magnetic (EM)-based sensor configured to reflect the signal transmitted by the external device; and
a sensor interface configured to measure a power level of the signal reflected and returned by the EM-based sensor and convert the signal into digital data,
wherein the sensor interface comprises:
a frequency-selective filter configured to filter the signal reflected and returned by the EM-based sensor; and
an envelope detector configured to find and output a minimum value in frequencies output by the frequency-selective filter.