Temperature detecting circuit and implanted medical device using the same

Abstract

The invention discloses a temperature detecting circuit comprising a temperature sensing circuit for acquiring a temperature voltage, a reference current generating circuit for acquiring a reference current with a temperature coefficient of zero, a trimming circuit for carrying out proportion-based mirror image trimming on the reference current to obtain a trimming current, a voltage generating circuit for generating a quasi-voltage and a threshold voltage corresponding to a first threshold temperature, and a comparing circuit. The comparing circuit is used for comparing the temperature voltage with the threshold voltage, outputting a first control signal when the temperature voltage is greater than the threshold voltage, and outputting a second control signal if the temperature voltage isless than or equal to the threshold voltage. According to the temperature detecting circuit provided by the invention, after generation of the reference current with the adjustable temperature coefficient, the trimming circuit and the voltage generating circuit are used for carrying out proportion-based mirror imaging on the reference current to a reference voltage circuit and a threshold voltagecircuit so as to generate a reference voltage and a threshold voltage that are not affected by the temperature change. Therefore, the comparison result of the comparison circuit is more accurate andpower consumption of the entire circuit is also reduced.

Description

technical field [0001] The invention belongs to the field of implantable medical devices, in particular to a temperature detection circuit and an implantable medical device using the same. Background technique [0002] In implantable medical devices, nerve stimulators can effectively control the symptoms of functional neurological diseases and mental diseases by chronically stimulating target nerves. Common implantable medical devices are used to treat cardiac arrhythmia pacemakers, defibrillators to treat heart fibrillation, retinal stimulators to treat blindness, muscle stimulators to produce coordinated limb movements, and more. [0003] Generally speaking, the components of an implantable neurostimulator include a stimulation chip, a stimulation controller, a wireless communication module, a voltage conversion module, a wireless charging module, a battery, and so on. Implantable neurostimulators consume power during normal operation, and the more functions they have, th...

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Problems solved by technology

[0005] The electric energy of wireless charging will lose energy during the transmission process, and part of the energy will be released in the form of heat energy. The problem is that the temperature of the part where the human body is implanted with the stimulator will increase.

If the temperature continues to increase and exceeds a certain value of the human body temperature, the human body will feel uncomfortable, and in extreme cases, it may damage human tissue; in order to realize temperature monitoring, in the prior art, a thermistor is generally integrated in the PCB as a temperature detection, but due to The thermistor has a large error and is easy to absorb current, which reduces the accuracy of temperature monitoring and increases the burden on the battery. As an external device, the thermistor may be easily damaged by the device and occupies a large space, which is not conducive to Make smaller implants

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