11
To fix MPOD on the body patient, use solutions provided by the product supplier. Be sure not to
tighten up excessively. The MPOD is provided with a mechanical interface to attach bracelets, belts
or straps. This is the only interface that the user must use to adapt non-magnetic bracelets provided
by the manufacturer. The MPOD should not be in contact with any other material that can cause
measurement distortion.
MPOD must however remain attached on the body. A biocompatible Clothing interface will be
placed between the skin and the MPOD to guarantee hygiene and to avoid direct contact.
Do not use any other mechanical interface than the one provided by the supplier and specially made
for this purpose.
VIII.
PRECAUTIONS
1.
USING ENVIRONMENTS
The MPOD is a measurement technology based on accelerometers, magnetometers and gyroscopes.
Its main purpose is to provide the user with 3D orientation of the body segment wearing the sensor.
The MPOD is well-adapted to estimate posture of a joint segment. Measurements must be carried
out within the limitations of the sensor:
•
8G acceleration
•
Maximum Angular velocity: 1600°/s
The use of MPOD does not have any long term effect. Movements of the patient must however be
carried-out under the supervision of a health professional. Indications given by the MPOD are
provided as an indication.
The MPOD encloses sensors that to measure orientation parameters in space. These measurements
should not be used for diagnosis. They are only informative and meant to support the physical
therapists decision. They are not certified, so the information they give must be subject to
discussion.
Like any other electronic device, there is a risk of modification of the system’s
essential performances in case of electromagnetic disturbances. This risk is
increased by the presence of magnetometers in the system.
Note 1: A magnetic object is disturbing. Similarly, a ferrous object (attractable by a magnet)
is also very likely to disturb magnetometers of the MPOD™.
Note 2: A mobile phone often has a loudspeaker which contains magnets itself.
For best performances of your system, you must respect conditions of use and rightfully choose the
site where you carry out your measurements:
•
You must carry out sessions of measures at a usual chosen place, where magnetic
disturbances are minimal.
•
When various postures or positions are carried out by the subject, it is necessary to avoid
translations higher than 1m of amplitude. The static magnetic field must be constant and
uniform inside the area of work.
•
Keep any ferrous objects far from the measurement site (approximately at a distance twice
the largest dimension of the ferrous object) ; for example :
o
Scissors : 30 cm
o
Laptop battery : 50 cm
