Hello Gonneke,
The power/area of the ultrasound will modify the energy deposited in
the tissue under treatment. It may change the amplitude of the
vibration, but it will not affect the frequency.

What will happen with a higher power is that the attenuation will be
lower in the tissue that is between the ultrasound emitter and the
area you want to treat. If your ultrasound wave has low power, then it
will be quickly attenuated and will become heat in the tissue before
the area you want to treat.

Sound shock waves are used to treat kdney stones. The name of the
technique is lithotripsy. I wonder if in this mechanism lies the
explanation for the use of ultrasound in treatment of obstructions in
the breast. And I also wonder whether somethign along the lines of
lithotripsy could be used to treat blockec ducts.

Best regards,

Veronica


>  3. heat/ ultrasound and blocked ducts
> ------------------------------
>
> Date:    Mon, 16 Feb 2009 22:49:07 -0800
> From:    gonneke van veldhuizen <[log in to unmask]>
> Subject: Re: heat/ ultrasound and blocked ducts
>
> Dear friends,
> My dear hubby has a low back hernia and needed physical therapy yesterday. =
> I had to drive the car for him and so went in with him to chat with the the=
> rapist (a friend of ours). We talked ultrasound in his and my job. He told =
> that in every therapeutic use he knew the better results come from higher w=
> atts/cm2. They used to use 1 to 1.5 W/cm2, but tend towards 1.5 to 2 now. T=
> here is little evidences based protocol here, they seem to have similar dif=
> ficulties in using randomised double blind studies as we in lactation, but =
> empiric evidence shows.
> Now, does higher Watts mean more vibration? My physics is not that good. If=
>  so, I guess a vibrator might do the trick as well.
>
> Warmly,
> Gonneke, LLLL, IBCLC, MOM in wet and greyish southern Netherlands
>
*********************************************
>



-- 
Verónica Garea
GALM Bariloche
IBFAN Bariloche - LLL Argentina
" La verdadera sabiduría está en reconocer la propia ignorancia./True
knowledge exists in knowing that you know nothing."
Sócrates

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