An elementary question - Percussive waveform moving through human tissue

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I need a better understanding and explanation of how a percussion wave form can move through biological soft tissue. I know that human soft tissue functions microscopically in a fluid environment however I also understand that there are also obstructive forces in the way of a wave moving in a straight line when it comes to said soft tissue. Without going into further detail regarding my question, can anyone give me a good understanding which might then instigate an additional question!
 

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  • #2
berkeman
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I need a better understanding and explanation of how a percussion wave form can move through biological soft tissue. I know that human soft tissue functions microscopically in a fluid environment however I also understand that there are also obstructive forces in the way of a wave moving in a straight line when it comes to said soft tissue. Without going into further detail regarding my question, can anyone give me a good understanding which might then instigate an additional question!
Welcome to the PF, doctor. :smile:

It is probably related somewhat to how ultrasound moves through the body and is used to produce images. What is the frequency range of your percussion waves? Is the amplitude similar to what is used in typical ultrasonic imaging, or are you looking at higher amplitude percussion waves like blast waves?
 
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JAA
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Welcome to the PF, doctor. :smile:

It is probably related somewhat to how ultrasound moves through the body and is used to produce images. What is the frequency range of your percussion waves? Is the amplitude similar to what is used in typical ultrasonic imaging, or are you looking at higher amplitude percussion waves like blast waves?
Thank you for responding so quickly. This is where my physics of waves is VERY limited. My understanding simply, is that the difference between all wave forms i.e., sound, light, electrical, vibration, etc, are a matter of frequency. My guttural response (as we do not have this well defined) is that through our instrument delivered force to the upper cervical spinal complex, we utilize a blast from a hammer hit to a solenoid coil which delivers a percussion wave through the soft tissue at an angle that has been calculated to provide the highest degree of leverage to bypass muscular hold of the first cervical vertebra in malposition by stimulating the motor nerves to alter their over-firing. I'm challenged because I feel if I could understand friction obstacles at the level of the bio-molecular level I could have a better grasp on how to improve on how I am applying that force and in which direction.

I have a lot of questions in the way of application of force on biological tissue as well as how the direction of that force is applied, however I feel I need to understand some basics!?
 
  • #5
JAA
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Are you interested in a somewhat biophysical answer focused on trauma?:

https://www.ncbi.nlm.nih.gov/books/NBK299193/

Or

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4160106/

If you could clarify your goal maybe we could help. Note: I'm just a biologist, @Andy Resnick trends more toward Biophysics and can likely help, too.
My goal is to evaluate our use of an 8 pound percussion wave force delivered at a calculated Z and Y vector through soft tissue at the level of the 1st cervical vertebra (stabilized only by soft tissue), understand why our outcomes are fantastic on some and but less effective on others, and potentially change how we do what we do just a little to improve our outcomes.

Thank you so much for directing me to the books and articles you noted. I know they will help me. I am really appreciating this wonderful platform of excellent minds that I can ask questions in.
 
  • #6
berkeman
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My guttural response (as we do not have this well defined) is that through our instrument delivered force to the upper cervical spinal complex, we utilize a blast from a hammer hit to a solenoid coil which delivers a percussion wave through the soft tissue at an angle that has been calculated to provide the highest degree of leverage to bypass muscular hold of the first cervical vertebra in malposition by stimulating the motor nerves to alter their over-firing.
I assume you are not doing this on cadavers, since you talk about active electrical activity in the muscles around C1-C3. Is this clinical research being done under the FDA or some other authorizing body? What kind of a waiver do your patients need to sign to go through this experimental treatment? Are there any journal articles or medical textbooks that describe this procedure?

https://www.fda.gov/ScienceResearch/SpecialTopics/RunningClinicalTrials/default.htm
 
  • #7
JAA
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I assume you are not doing this on cadavers, since you talk about active electrical activity in the muscles around C1-C3. Is this clinical research being done under the FDA or some other authorizing body? What kind of a waiver do your patients need to sign to go through this experimental treatment? Are there any journal articles or medical textbooks that describe this procedure?

https://www.fda.gov/ScienceResearch/SpecialTopics/RunningClinicalTrials/default.htm
I'm sorry if I have caused some anxiety over my post. My comments regarding motor activation has to do the nervous system of the body. Our instrument has been FDA approved and does not deliver electricity to the consumer. Please look up www.globalao.com to learn more about what I am discussing. And, there are numerous sources on the in research having been written and in the process of being written up and studied on the efficacy of upper cervical specific chiropractic. I, myself, am working on writing literature reviews to sift through what is already known and I am working on utilization of the chiropractic schools to conduct specific studies.

I would like to focus on my questions so that I can continue to learn for myself as a dedicated and disciplined practitioner. Thank you for adding the link to running clinical trials. Our group and chiropractic community is conducting ongoing studies as quickly and effectively as we can!
 
  • #8
berkeman
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Our instrument has been FDA approved and does not deliver electricity to the consumer. Please look up www.globalao.com to learn more about what I am discussing. And, there are numerous sources on the in research having been written and in the process of being written up and studied on the efficacy of upper cervical specific chiropractic.
Thanks for posting that. BTW, do you have a link to the actual instrument? I was not able to find it at the GlobalAO website. Just a journal article describing their study. Thanks.
 
  • #10
berkeman
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Wow, that's a big needle! Does it go all the way through her neck?

(J/K) :smile:
 
  • #11
JAA
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1/4" diameter stylus and a resounding "no" it does not go through the skin...only touches it. Ok, but, I'm still in pursuit of my original question. I'll keep plugging away and again, I really do appreciate your responses and interest. I too LOVE science.
 
  • #12
Andy Resnick
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My understanding simply, is that the difference between all wave forms i.e., sound, light, electrical, vibration, etc, are a matter of frequency.
That is very untrue- just because those phenomena can often be described in terms of wave propagation does not mean they are all the same. It appears you are examining sound (pressure) wave propagation- a mechanical process, and the tissue responds mechanically.

My guttural response (as we do not have this well defined) is that through our instrument delivered force to the upper cervical spinal complex, we utilize a blast from a hammer hit to a solenoid coil which delivers a percussion wave through the soft tissue at an angle that has been calculated to provide the highest degree of leverage to bypass muscular hold of the first cervical vertebra in malposition by stimulating the motor nerves to alter their over-firing. I'm challenged because I feel if I could understand friction obstacles at the level of the bio-molecular level I could have a better grasp on how to improve on how I am applying that force and in which direction.
You are not applying a force- you are applying a pressure transient. Physics 1 may treat these as interchangeable, but for your application you should not. The pressure wave will diffract as it propagates and also reflect from tissue interfaces (the principle of ultrasound imaging). Not sure how application of pressure transients will excite nerve tissue- what is the threshold stimulation, for example. A related application may be a lithotripter:

https://en.wikipedia.org/wiki/Extracorporeal_shock_wave_lithotripsy

If you learn how the shock wave is controlled so that it targets a specific volume, you may gain some insight for your application.
 
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  • #13
JAA
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Thank you for responding. You'll have to excuse my oversimplification of certain concepts and/or phenomena! I'm trying to learn the difference between Sound wave propagation and percussion wave propagation. I then want to find out how much my percussion wave dissipates after traveling a short distance through soft tissue medium from its force, in pounds, discharge.

I also read the link from wikipedia so I'm still searching. Your time and words are really appreciated
 
  • #14
Nidum
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(1) Much depends on the initial conditions .

If the hammer is forcefully held against the body tissue before the impact is applied then much more impact force will be transmitted than where the hammer is only held lightly against the tissue or where there is no pre contact at all .

When the tissue is pre-compressed it will become relatively stiffer in the direction of force application .

(2) The vertebra and tissue structure and it's response to an impact load can probably be modelled quite well using normal engineering methods .

Possibly something like this has been done before using ANSYS ?
 
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  • #15
Nidum
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I think that it might actually be feasible to set up a 1D model of this system which would be good enough to give useful answers .

Certainly worth looking at before moving on to more complex models .
 
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  • #16
JAA
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I appreciate your thoughts however not certain I agree as I've actually seen and experienced the opposite. Point is, this question of force load proportional to power does not result in a consistent result. I will definitely look into your recommendations. Thank you!
 
  • #17
Tom.G
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An interesting history of chiropracty.http://www.latimes.com/business/lazarus/la-fi-lazarus-chiropractic-quackery-20170630-story.html
http://www.latimes.com/business/lazarus/la-fi-lazarus-chiropractic-quackery-20170630-story.html

Although the above article is rather negative, chiropracty does have some successes. My own experience is: two bad experiences, one helped for about a week, the fourth, when x-rays were viewed, I was thrown out of the office; the Dr. didn't want to chance making things worse!
 
  • #18
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As a former flight surgeon, we learned about military studies of multiples types of effects to the human body. The velocity of a bullet round entering the human body will affect the cavitation effects on the tissues and that pressure wave makes a huge difference for the extent of injuries sustained by the victim. Near an explosion, the blast wave will also cause humans tissues to act more like a liquid than a solid. The intensity of the blast wave determines whether the tissues remain intact or are disrupted, with different areas, such as the arch of the aorta, that plays a huge role in survival chances. However, harmonic frequencies play a key role in flying many aircraft, especially rotary wing designs. Two of the older helicopters had the generation of harmonic frequencies in the same range as the lumbar spine and pilots who flew those aircraft had a lot of lower back issues. Sikorski even did tests on the Blackhawk and made structural changes to the design to assure that harmonic frequencies were not set off by that aircraft. The F-16 was a 12G-capable aircraft but it had such a rapid onset of G-forces that it had computerized governors to keep the G-forces at or below 9.0 Gs because of the effects in had on its human pilots.
 

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