Surgery – Truss – Pad
Patent
1987-02-24
1989-01-31
Hindenburg, Max
Surgery
Truss
Pad
128 78, A61B 510
Patent
active
048008974
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for detection of relative movements or positions of one or more parts of the body, comprising at least two measuring sensors which are attached to the part/parts of the body the movements/positions of which are to be measured, by which signals are emitted to a signal processor for storing and/or analyzing.
BACKGROUND OF THE INVENTION
There is a great demand for studies and analyzes of body movements during different working moments, e.g. in industry. The most important reason is to prevent pains and injuries, e.g. in the back and the neck, where they are very frequent. Another reason is that the law of "occupational injury insurance" requires that mechanical stresses, that a person have been exposed to in an occupational injury, have to be estimated.
Today, it is common that physiotherapists or industrial hygienists visit working places and study in which way the different working movements are performed, and thereby this knowledge is increased and makes it possible to take steps to decrease the presence of injuries and pain, which is very high in different exposed working places. By studying for example how many times and for how long a part of a body is in a special position, a base is obtained to give the size of the stress for different working movements and this makes it possible to give advice and if necessary restrictions for performing the working movements.
THE PRIOR ART
Many devices for detection of movement or position of a part of the body are known today. These are based on different registration techniques. For example, film-cameras or video cameras can be used for registration of a working movement. But the evaluation of the film if quite time- and work-consuming. Important limitations also appear when the film is taken; thus, the technique can be used only in a few cases.
Another known technique is based on opto-electronics, where e.g. an infrared-camera is used to detect a number of points of light which are attached on the object. Because of the disadvantage that the points of light have to be exposed to the camera all the time, this method is not suitable for measurements in real working places where some movements might be hidden by machines or likewise. The evaluation in this case requires also a lot of work.
The most suitable technique for detection of movements or positions of a working person (the test object) is the goniometer technique. This technique means that some kind of sensing member is constructed, e.g., an angular sensing member, which physically detects the movements or the position of the part of the body and converts this to e.g. an electrical signal which is proportional to the movement or position. The quantity of information is processed/reduced in order to make it possible to present it in an easily readable way.
An example of the goniometer technique is described in the Swedish Pat. No. 7900887-7 which presents a device for measuring the position of a part of the body in relation to the earth's gravitation. It is not possible to measure e.g. the bending of a part of the body in relation to another, with this device.
Another registration device is shown in U.S. Pat. No. 4,306,571. Herein, a three-plane measuring device comprising three potentiometers which are arranged to measure the rotation of a knee in three axes or planes is described. For example, square shafts are used for mechanical transmission of torsional or rotational movements. But the field of application for this device is not the same as for the present invention. That is, it is only intended to make measurements of a knee, which is only one joint and cannot be compared with a complex system like a back, a neck, etc.
In U.S. Pat. No. 4,436,099 there is further shown a measuring device which is suitable e.g. for measuring of angular changes between a person's upper arm and forearm. With this device it is possible to measure angular movements only in one plane, which movements are converted optically by a disc having segments of different colours, said dis
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Hindenburg Max
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