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Thread: Cheap Doppler, Any use?

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    Re: Cheap Doppler, Any use?

    Quote Originally Posted by sherwood  View Original Post
    Ahhhh...the love between you two
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    Glad I could provide the entertainment for the day.

  2. #22
    RBW Member saturation has a spectacular aura about saturation has a spectacular aura about saturation has a spectacular aura about saturation has a spectacular aura about saturation has a spectacular aura about saturation has a spectacular aura about saturation's Avatar
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    Re: Cheap Doppler, Any use?

    Quote Originally Posted by acuevas  View Original Post
    Is Doppler fetal heart monitor better than the vascular doppler monitor?

    I know that fetal doppler are cheaper but on eBay there is this a vascular doppler monitor for only $99.00 and that is not too much.

    NEW CE PROVED VASCULAR DOPPLER MONITOR 8MHZ PROBE J - eBay (item 280580966738 end time Nov-26-10 00:48:13 PST)

    The Chinese dopplers are quite low cost, between $70-120 on eBay.

    I can't be sure what they advertise is correct.

    The higher the frequency, the deeper the penetration, but if it penetrates too deeply, you end up listening too through the artery/vein. So the trick is getting the frequency that makes the loudest sound.

    The preferred ones are between 2-5 MHz and shaped line a pen to make it easier to manipulate it under the collar bone.

    Just as example:




    Just basic, no LCD monitor needed. They all should come with an audio input jack for headphones so you can listen with some cheapo earbuds in a noisy location. Headphones or earbuds you buy separately but any will do, I just got mine from a dollar store for $1.

  3. #23
    RBW Member Owen P. Bermann is an unknown quantity at this point Owen P. Bermann's Avatar
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    Re: Cheap Doppler, Any use?

    Quote Originally Posted by saturation  View Original Post
    The Chinese dopplers are quite low cost, between $70-120 on eBay.

    I can't be sure what they advertise is correct.

    The higher the frequency, the deeper the penetration, but if it penetrates too deeply, you end up listening too through the artery/vein. So the trick is getting the frequency that makes the loudest sound.

    The preferred ones are between 2-5 MHz and shaped line a pen to make it easier to manipulate it under the collar bone.

    Just as example:




    Just basic, no LCD monitor needed. They all should come with an audio input jack for headphones so you can listen with some cheapo earbuds in a noisy location. Headphones or earbuds you buy separately but any will do, I just got mine from a dollar store for $1.
    Actually, the relationship between frequency and penetration is inverse. Higher frequency = less penetration. The 8 MHz probe is adequate to get to the subclavian vessels unless you're using them on someone really big.
    Higher frequency also gives you a larger Doppler shift which translates into a higher pitch (not necessarily louder, but should be easier to hear that the 2 MHz). The 8 MHz probes are typically used for detecting pulses in very superficial vessels in the extremities, usually feet, and wrist, but it can reach deeper. Your depth limit with the 8 MHz probe will likely be around 5 cm which shoud be fine.


    Owen

  4. #24
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    Re: Cheap Doppler, Any use?

    Owen is right, my bad. The higher frequency is less penetration. My error.

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