Implanted passive wireless acoustic surface wave sensor detection device

Abstract

The invention discloses an implanted passive wireless acoustic surface wave sensor detection device. In the device, the power supply output end of an in-vitro processing module is connected with an in-vitro transmitting antenna, while the signal input end is connected with an in-vitro receiving antenna; an in-vivo receiving antenna is connected with a wireless power supply module which is connected with an acoustic surface wave sensor detection module that is connected with an in-vivo transmitting antenna; the in-vivo receiving antenna device is arranged in the radiation area of the in-vitro transmitting antenna; the in-vitro receiving antenna is arranged in the radiation area of the in-vivo transmitting antenna; the acoustic surface wave sensor detection module has the same central frequency as the in-vivo transmitting antenna; the in-vivo receiving antenna has the same central frequency as the in-vitro transmitting antenna; the in-vitro receiving antenna has the same central frequency as the in-vivo transmitting antenna; and the central frequency of the in-vivo receiving antenna and the in-vitro transmitting antenna is smaller the central frequency of the in-vitro receiving antenna and the in-vivo transmitting antenna. The device can detect the physiological parameters of organisms with high accuracy and has a long measurement distance.

Description

Technical field [0001] The invention relates to a surface acoustic wave sensor, an antenna, and wireless energy supply technology, in particular to an implanted passive wireless surface acoustic wave sensing and detecting device, and belongs to the technical field of implanted medical electronic instruments. Background technique [0002] Passive wireless surface acoustic wave sensing detection system is a research hotspot in the field of sensing detection systems in recent years, and its system is basically composed of three parts: surface acoustic wave sensor module, antenna module and interrogator module. Its working principle is: the interrogator sends out a radio frequency interrogation signal through the antenna, and the surface acoustic wave sensor receives the interrogation signal and converts the physical signal to be measured into a frequency signal or a phase signal. The antenna responds to the interrogator, and the interrogator performs a certain processing The respons...

AI Technical Summary

Problems solved by technology

However, the implantable passive wireless surface acoustic wave sensing technology faces the following technical problems: 1) The international radio management organization divides the biomedical telemetry communication frequency band around 433MHz, so it is applied to the implantable surface acoustic wave The operating frequency band of the sensor device should be designed around 433MHz. However, due to the high frequency in this frequency band, physiological organisms have a large attenuation of electromagnetic waves and different tissues have different attenuation of electromagnetic waves. For example, experiments have shown that 5mm thick skin tissue attenuates electromagnetic waves at 433MHz About 15db~20db, which makes it relatively difficult for electromagnetic signals to propagate in the body

Therefore, in the research on implantable surface acoustic wave sensing in Europe, America, Japan and other developed countries and regions, some researchers use wired measurement methods, such as Nachappa Gopalsami, Ivan Osorio et al. published in IEEE SENSORS JOURNAL in July 2007 The article "SAW Microsensor BrainImplant for Prediction and Monitoring of Seizures" presents an implantable surface acoustic wave temperature sensing system and device for monitoring the brain temperature of epileptic patients. The detection sensitivity can reach 0.005°C, but the sensor The measurement method of the sensing detection system and device is wired measurement, which limits its application in the implantable field

2) Increasing the electromagnetic radiation energy outside the body can increase the signal-to-noise ratio of useful signals and improve the communication quality in the living body, but excessive electromagnetic radiation energy will cause damage to biological tissues

G.Martin, P.Berthelet, J.Masson et al published the article "Measuring the Inner Body Temperature using a Wireless TemperatureSAW-Sensor-Based System" in IEEE Ulrrasonics Symposium Volume 4, Page 2089-2092 in 2005, aiming to design a measurement The passive wireless surface acoustic wave temperature sensing device for the temperature of the organism's digestive system gives the corresponding design ideas and technical solutions, but because it uses the traditional passive wireless surface acoustic wave sensing technology, it uses intermittent RF pulse or RF sine pulse train is used as the interrogation signal, and the interrogation signal and the echo signal work in the same radio frequency band, so the signal amplitude is weak and the signal-to-noise ratio is poor, the measurement distance is short (about 2-3cm) and the accuracy is low

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