Designing an Amplifier Circuit for Hypothermia Treatment Device

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    Amplifier Circuits
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Discussion Overview

The discussion revolves around the design of an amplifier circuit intended for a device that measures brain temperature and subsequently heats the blood to treat hypothermia. Participants explore the technical aspects of the circuit design, including its functionality and the underlying principles necessary for effective operation.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • The original poster describes a circuit designed to measure brain temperature and heat blood, but notes that their professor believes the circuit will not work.
  • Some participants question the design, asking for clarification on the intent behind the circuit and the role of the NPN transistor and variable resistance.
  • Concerns are raised about the absence of a voltage source (Vcc) and the specific resistor responsible for heating the blood.
  • Participants suggest that the circuit may require negative feedback to maintain control over the heating process.
  • There is a mention of the need to understand contraindications for active heating in hypothermia treatment and traditional methods of active heating.

Areas of Agreement / Disagreement

Participants express varying levels of concern about the circuit design, with some questioning its feasibility while others suggest seeking additional expertise in medical sciences. The discussion remains unresolved regarding the effectiveness of the proposed circuit.

Contextual Notes

Participants highlight potential limitations in the circuit design, including missing components and the need for further understanding of medical protocols related to hypothermia treatment.

himansipatel
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Hi,

I have project to design a device that measures the temperature of the brain first and then heats the blood to normal tempearture. it is used to treat hypothermia. In hypothermia, temperature of the blood drops down. i have designed a circuit for it. I have attached the pic. It is a neck patch which goes around the neck. I showd to my prof he said my circuit won't work. i need to change the circuit. i also need to show the equations for the circuit. Can someone help me with this? Thank you
 

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Welcome to PF, Himansipatel.
I'm afraid that I can be of no help to you. I'm wondering, though, if it might be worthwhile to open a post in 'Medical Sciences' directing people to this one. There's a strong possibility that someone there has experience with such things.
 
himansipatel said:
Hi,

I have project to design a device that measures the temperature of the brain first and then heats the blood to normal tempearture. it is used to treat hypothermia. In hypothermia, temperature of the blood drops down. i have designed a circuit for it. I have attached the pic. It is a neck patch which goes around the neck. I showd to my prof he said my circuit won't work. i need to change the circuit. i also need to show the equations for the circuit. Can someone help me with this? Thank you

I may end up moving this to Medical Sciences as Danger suggests, but for now I'll keep it here.

The circuit as you've drawn it does appear a bit odd. What is your intent with it? Are you trying to generate a voltage at the collector of the NPN transistor, based on the variable resistance (is that your temperature measuring element?)?

Also, have you done much reading about treatment for hypothermia? Do you know what the contraindications are for active heating? What is the traditional method of active heating, and when is it indicated over passive heating?
 
himansipatel said:
Hi,

I have project to design a device that measures the temperature of the brain first and then heats the blood to normal tempearture.
...

Where is the Vcc source?
Which resistor is going to heat the blood?
It seems your transistor is the wrong type.
Your circuit should have a kind of negative feedback (to keep things in control).
 
Last edited:

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