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Summary of responses on sensitive pad for orthopedic measurements

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  • Summary of responses on sensitive pad for orthopedic measurements

    Hello

    Here is a summary of the responses I received in reply to my question
    (see below).

    Terry O'Bannon:

    Check out the Novel Pedar system at http://www.novel.de/

    ************************************************** ********

    Wagner de Godoy:

    Try the following addresses:
    http://www.rsscan.com/
    http://www.tekscan.com/
    http://www.novel.de/

    ************************************************** ********

    Jason K. Otto:

    I know of two commercially available products:
    F-Scan by Tekscan (www.tekscan.com). It's resistance based.
    Pedar by Novel (www.novel.de). It's capacitance based.
    Tekscan has better resolution, but accuracy is potentially better with
    Novel. Tekscan is cheaper ($15,000?) than Novel ($25,000?).

    ************************************************** ********

    Jan Simon:

    There are a lot of papers concerning the distribution of pressure. Look
    at MedLine (http://www4.ncbi.nlm.nih.gov/PubMed/ ).

    Some old ideas and methods:

    1. A plate with silicon pyramids, base length 0.5cm, lying on a plate of

    glass. Between the pyramids there is a couloured liquid and photographs
    are taken from beneath. Evaluation of the photographs is difficult.

    2. Let the subject walk over a force plate (e.g. Kistler) and don't hit
    the plate with the complete foot, but with only parts of it. Very
    tricky!
    Scott and Winter did this 1992 in the Journal of Biomechanics and the
    calculated the forces inside the foot.

    3. Several sheets of paper are lying under the foot, the one direct
    under
    the foot is prepared with ink. The higher the pressure, the more sheets
    are coloured.

    4. The only real, accurate and easy way is to borrow a EMED plate from
    Novel. All self made systems have to be calibrated, what is an
    unpleasant
    work. The same way is to collaborate with a gaitlab using such plates.
    Novel offers some soles for measuring in shoes too.

    ************************************************** ********

    Guy Gosselin:

    Why not have a look into the Pliance System from Novel (Munich), or the
    Emed insole (Zurich).
    Alternatively, depending on the resolution that you need, you could
    create a simple piezo film sensor matrix. Have a look at at
    http://www.msiusa.com/piezo/metallized_piezo_film.htm

    ************************************************** ********

    Alison McConnell:

    Tekscan makes in-shoe pressure sensors. their sensors are reusable (and
    quite dynamic) have two layers of resistive ink lines at right angles to

    one another and decrease their resistance with increased force. where
    the ink lines cross over is a "sensel" and the output gives you the
    pressure or force at each sensel. there's some stuff in the literature
    about problems with it, but i think 5% should be no prob. just make
    sure
    you understand their "calibration" algorithms.
    Fugi-film might be another option. it is a static, one-time
    measurement.
    i think ink bubbles burst and colour the pad. the staining is
    indicative
    of the load. lots in the lit on that.

    ************************************************** ********

    Craig Nevin:

    The best equipment is from RSscan International.
    They use a sensor array with 3 or 4 sensor per square centimeter.
    These EACH record at up to 500hz. The pressure plates come in a
    basic 0.5m size and multiples. They are the only pressure plates that
    can be coupled to forceplates to provide a real-time calibration if
    accuracy is what you are after.

    ************************************************** ********

    Apart from BIOMCH-L list I also found:

    1) Podia-Scan ( http://www.fuji-prescale.com/podiascan.html ).
    This one was mentioned above by Alison McConnell as a "Fugi-film"

    2) Vista Medical company (Canada)

    3) AMT company (Boston, Mass., USA)

    For two last items I have no web links and any details.

    Thanks to all who sent a reply.

    WBR,
    Andrei Chermyanin, Dipl. eng.


    Original question:

    >Which methods are there for measurement of pressure distribution
    >beneath human foot? To use a matrix of miniature load cells seems to
    >me much complex and expensive because I must to provide >measurements
    in a few hundreds points beneath of both foots.
    >Maybe somebody know other solutions which are less expensive and >more
    elegant? There is no need to measure during walking, only in static
    >state, and 5% error is quite acceptable.

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