1. important information

1.1 General information

With the pressure measurement system GP MultiSens WiFi you can record the plantar pressure load.

The pressure data from the measuring platform is sent directly to your PC via WLAN, where it is stored and analysed. The measuring platform has 2,304 pressure sensors distributed over a measuring area of 38 cm x 38 cm. The maximum measuring frequency is 200 Hz.

This manual in digital form, as well as answers to frequently asked questions, can be found on our support homepage -  www.gpsupport.de

1.2 Intended use

The target user group for the systems is not made up of end users, but of specialist groups (engineers, orthopaedic (shoe) technicians, biomechanics specialists, trainers, etc.) from the various sectors:

• Orthopaedic (shoe) technology
• Sport
• Science

The user of the GeBioM pressure distribution measuring systems is always given an introduction when the systems are delivered, e.g. online or on site. This includes basic handling of the systems, exclusion criteria for certain measurement situations (e.g. do not use sharp objects, etc.) and an introduction to the evaluation options of the respective system. The specialist knowledge required to analyse the results is assumed. The devices cannot be used contrary to their intended purpose according to normal judgement. The measures taken by the user based on the respective measurement results are always subject to his personal expertise and philosophy.

The systems are designed in such a way that the respective test person (in industry usually employees of the respective department, in sales consulting the customer, in orthopaedic (shoe) technology the customer/patient) is not significantly influenced by the movement of the measuring sensors. The subject merely walks across the measurement field.

Important:          Make sure that the measuring foil is not damaged by sharp objects.
objects is loaded. This could cause the sensors to malfunction.

1.3 Calibration cycles

GeBioM recommends regular calibration of the measuring system by the manufacturer, at least once a year. If the system is used almost daily, the calibration should be repeated more often.

2. hardware MultiSens-WiFi

2.1 Scope of delivery

• (1) MultiSens WiFi platform
• (2) 12 V power supply unit
• (3) WLAN router incl. plug
• (4) WLAN stick
• (5) USB extension cable
• (6) Software installation stick

2.2 Installation and commissioning

• Install the GP Manager from the enclosed USB stick (6) or with the help of an installation or update link. You will be guided through the individual steps of the installation.

• Once the GP Manager has been successfully installed, plug the WLAN router (3) into a nearby socket. It is used for data transmission and must be supplied with power during the entire measurement process. If no power socket is available, use the USB port on your PC as a power source. The router and the disc each have a sticker with the serial number (blue). If you have several MultiSens WiFi discs, make sure that the router and disc are assigned correctly!

Remark: Please press not the reset button on the router. As a result, you will no longer be able to carry out measurements as important settings will be deleted.

• Data is transferred between the platform and computer via WLAN. If your PC already has a WLAN interface because you are using the platform on a laptop, for example, you can use the internal WLAN interface on your laptop. If your PC does not have a WLAN interface, use the WLAN stick (4). Plug this into a free USB port on your computer and ideally use the USB extension cable (5) to ensure an interference-free wireless connection. The WLAN stick normally installs itself automatically if an Internet connection is available. If the WLAN stick does not install automatically, please download the appropriate driver from the manufacturer's website:

tp-link.com/en/download/TL-WN821N.html#Driver

• Connect to the WLAN of the router. This corresponds to the serial number of your disc. To do this, click on the network symbol ( or ) in the bottom right-hand corner of the screen and then on "GP-MS4-W-20xx-xx" (see figure 3). Then click on "Connect". The password is: 12345678

• Switch on the MultiSens platform (1). The switch is located next to the handle. The platform has an integrated rechargeable battery. The battery life is approx. 10 hours. The platform may only be charged using the enclosed mains adapter (2) and can also be operated during the charging process.

• The platform has four LEDs:
• green = Power ON,
• red = battery is charging
• orange = battery is fully charged
• white = platform has connected to WLAN router

• Now open the already installed GP Manager and start a measurement in the module GP Balance.

3. software module GP Balance

With the software module GP Balance the plantar pressure distribution is measured while standing. The centre of gravity of the pressure calculated from this provides information on how well the person can maintain their balance.

3.1 Overview

To start the module, you must first select a customer or create a new one. To do this, click on the following symbol at the top right . To create a new customer, click on and fill in at least the mandatory fields marked with an *. The arrow then takes you back to the start page and you can start the GP Balance module.

3.2 Perform measurement

Once the pressure measuring plate has been switched on and connected (see 2.2 Installation and commissioning), the measurement can be started. One person stands barefoot with both feet on the pressure measuring plate and tries to stand as still as possible. Click on "Measure" to start the measurement.

3.2.1 Time

The measuring time is set to 10 s as standard. This means that the measurement is automatically ended 10 seconds after the start. If desired, a different measurement time can be set or the measurement can be started and stopped as required by deactivating the "Time" tick box using the "Measure" button. The target measurement time and the current measurement time are displayed to the right of the pressure distribution.

3.2.2 Turning

The "Rotate" button allows you to rotate the view in 90° increments. This is only possible during the live measurement, not afterwards.

3.2.3 New track

Clicking on the "New track" button restarts the live measurement, i.e. the time starts again at 0 and the previously recorded pressure values are deleted. This can be useful if the person was not ready at the beginning.

3.2.4 Maximum values

By default, the totalised pressure distribution is always displayed for the balance measurement (maximum values). If the corresponding tick box is deactivated, only the current pressure distribution is displayed.

3.2.5 Ellipse

The ellipse provides information about the person's stability. It is calculated automatically on the basis of the centre of gravity data and is displayed as an orange circle. The ellipse can be deactivated by ticking the box. Then only the course of the centre of gravity is shown. You can find out more about analysing the balance measurement using the ellipse under 3.3.4.

3.3 Presentation and analysis

After the measurement time has elapsed or the measurement has been stopped with the "Measure" button, the saved measurement appears on the user interface. The measurement time is displayed to the right of the pressure measurement.

Older measurements of the customer can be selected by clicking on the top right.

3.3.1 Info

By clicking on "Info...", you can enter information about the recorded measurement. This is then displayed in the display area at the top left.

3.3.2 Legend

The pressure in the respective foot region is displayed as a coloured isobaric representation. The altitude can be determined using the legend on the right-hand side. The warmer the colour, the higher the pressure. The unit of pressure is given as standard in Newtons per cm² (N/cm²). In a balance measurement, a pressure range of approx. 14 N/cm² is shown in green and the foot region that exceeds a pressure value of 28 N/cm² is shown in red.

3.3.3 Centre of gravity (COP)

The software calculates the person's centre of pressure at all times. The COP (centre of pressure) is displayed as small squares in the software. The maximum deflection of the COP in the frontal and sagittal planes is shown in mm at the bottom of the screen.

3.3.4 Ellipse

The ellipse provides information about the person's stability. It is calculated automatically on the basis of the centre of gravity data and is displayed as an orange circle. The parameters of the ellipse are displayed above the pressure distribution. The larger the area of the ellipse, the greater the fluctuation in general. The angle indicates the orientation of the ellipse and therefore the direction of the fluctuation. Examples

• 0° = forwards/backwards
• 45° from rear left to front right
• -45° from rear right to front left

3.3.5 Crosshairs and percentage pressure distribution

The thin, black horizontal and vertical lines are intended to represent a crosshair (see Figure 5). The orange bars in the corners of the display area indicate the percentage distribution of the pressure in the four fields of the crosshairs. In Figure 5, for example, the left forefoot is loaded with 24% and the hindfoot with 22% of the total pressure. The crosshairs can be positioned accordingly by holding down the mouse button. If the crosshairs in Figure 5 were drawn vertically to the bottom edge of the image in the centre, the percentage distribution right-left foot is shown.

3.3.6 Comparison

You can compare the currently open measurement with another measurement. To do this, click on the button and select the desired comparison measurement in the preview window.

To view the selected comparison, you must tick the checkbox in front of the comparison.

If you deactivate the checkbox, you will return to the initial measurement.

The illustration shows a comparison of two measurements. When looking at the ellipse and the orange bars, it is easy to see that the person on the left is standing relatively still, whereas the person on the right is swaying very strongly from the left forefoot to the right hindfoot.

3.4 Printing

Measurements can be printed out by clicking on the printer symbol (top right). Various display options are available to you. If the comparison is active, the comparison is printed.

4 Quick guide

1. Plug the WLAN router (3) into a nearby socket and establish a connection with the PC (Password: 12345678)
2. Switch on MultiSens platform (1)
3. Select the customer button on the GP Manager start page and create a new customer or search for an existing customer
4. Use the arrow to accept the customer and return to the start page
5. The module GP Balance Open
6. A person stands barefoot on the pressure measuring plate
7. Click on "Measure" to start the measurement
8. When the measurement time has elapsed, the measurement is automatically saved and can then be analysed.