DE102005048496A1 - Medical diagnostics measuring mat e.g. for monitoring sleep, determines pressure distribution on surface using pressure sensors and has temperature and moisture sensors - Google Patents

Abstract

The mat has a number of pressure sensors (10) arranged over an area. The mat has sensors (3,4) for measuring temperature and/or moisture. Multiplexers (12,13) may be provided for combining measured values. Sensors (10) may be provided for measuring an electrocardiogram (ECG). ECG sensors may be provided, comprising an insulating layer, a silver layer and a conductive closed polymer foam layer.

Description

The The present invention relates to a measuring mat for measuring a pressure distribution on their surface with a variety of area distributed pressure sensors.

such Measuring mats are used, for example, in sleep research for monitoring of sleeping data usual. There is the focus of interest to the movement of the activity investigating subjects. A disadvantage of the use of the known Measuring mats in the field of sleep research, however, that in the Usually in addition to the surface-resolved pressure measurement additional parameters are needed to make a meaningful evaluation to ensure the data. For this reason, become common additional Measuring probes for determining further patient parameters on the subject attached. This results especially from the perspective of the subject the disadvantage that this in his freedom of movement through the attached sensors is obstructed. In addition, the entire measurement setup through the use of the pressure measuring mat and the additional ones Sensors extremely complex and therefore confusing.

A Another common application of the generic measuring mats are movement studies of infants in the context of surveillance to avoid the sudden Infant death. The generic measuring mats serve here to determine the pressure curve with which the infant on the mattress rests. As in the case of application in the field However, sleep studies are disadvantageous especially in the case of infant monitoring a variety of other parameters of interest for monitoring which the measuring mat does not deliver. For this reason, it is common in infant monitoring, more monitoring probes on the body of the infant to install. This again has the disadvantage that this is unpleasant for the infant can be. Furthermore, there is a risk that by movements of the infant the sensors come off. After all the overall measurement setup is complex and unwieldy.

Further Applications of the known measuring mats are z. B. in the orthopedic Gait analysis in the context of orthopedic Rehabilitation or general inpatient and outpatient vital signs monitoring of patients. In all these applications, in addition to the need for monitoring additional described above Parameter further the disadvantage that with a known measuring mat achievable accuracies in the pressure measurement to be desired. This is due to the fact that a exact pressure measurement, for example, a temperature shift of To take into account sensor signals would have.

task The present invention is therefore a measuring mat of the above specify the type mentioned, which is a particularly accurate pressure measurement allows and with which in general the surveillance of patients is particularly efficient and clearly designed.

Is solved this object according to the invention by that the generic measuring mat Having sensors for measuring a temperature and / or humidity. The advantage of the equipment of the measuring mat according to the invention with temperature and / or Moisture sensors is that based on a measurement of temperature and / or the humidity in the vicinity of the measuring mat a compensation of the pressure sensors measured pressure values z. B. software technology carried out can be. In the determination of the pressure values in this way according to the invention a very achieved high accuracy, which allows new applications. For example, the respiratory movement of the subject can be measured via the pressure sensors become.

In special advantageous embodiment of the invention are multiplexers for bundling provided the measured values. The multitude of measured values of both the pressure sensor matrix and the additionally raised according to the invention Temperature and / or humidity values can be advantageous the use of a multiplexer over a single signal line lead to an evaluation unit.

The Measuring mat according to the invention is still improved when arranged a variety of area distributed Temperature sensors is provided. This has the advantage that a Pressure compensation due to changeable Temperature values are not only a flat rate for all pressure sensors of the measuring mat, but rather also temperature gradients in the area of the measuring mat be recorded. this leads to an even more accurate evaluation of the pressure State of the art in most cases in addition to the generic pressure measuring mat carried out by attaching separate temperature sensors, a temperature measurement. Advantage of the integration according to the invention the temperature measurement in the generic measuring mat is therefore a more compact design with low cabling density. Besides that is the operation of the measuring mat particularly convenient for the operating personnel, as a additional Attaching temperature sensors to the patient or subjects with Advantage is eliminated.

In Another advantageous embodiment of the invention is a variety from areal provided distributed moisture sensors provided. This is possible with advantage also a variability or a gradient of the moisture at different locations of the measuring mat metrologically detect.

For example is common in anti-decubitus pads to observe the situation that in places of increased contact pressure increased perspiration of the Patients or volunteers occurs. A spatially differentiated arrangement of sensors for measuring the local humidity is therefore of great advantage.

In Advantageous development of the invention are sensors for measuring an electrocardiogram (ECG). The integration of an ECG measurement into the measuring mat according to the invention is used advantageous for further improving the clarity of the measurement order on the patient or subjects. This is the case with many applications, such as z. B. in infant monitoring or in the sleep laboratory or also during inpatient and outpatient vital signs monitoring from patients, routinely too the heart rate is determined by means of an ECG measurement. The integration according to the invention The ECG measurement in the measuring mat therefore offers the advantage of a Reducing complexity of the measurement setup and thus facilitates the use of the measuring mat considerably.

If about that in addition to a special embodiment arranged the invention a variety of area distributed ECG sensors, ECG leads can be body regions measure up. The error-proneness The ECG measurement is thus advantageously by redundant Measurements greatly reduced. For example, depending on the location of the Patients on the measuring mat only part of the ECG probes with the body of the Patients or volunteers. The inventive arrangement multiple ECG probes at different locations of the measuring mat thus advantageously increases the probability that at least a pair of ECG electrodes with the patient's body or subjects in suitable places for the waiting for the ECG signal is connected.

Especially is advantageous according to a preferred embodiment of the invention, when the ECG sensors have a dry electrode. These have for the integration in the pressure measuring mat according to the invention has proved to be particularly favorable, especially for a long-term measurement of the ECG.

In Advantageous embodiment of the measuring mat according to the invention is provided, that the ECG sensors each have at least one insulating layer, one Silver layer as well as a conductive have closed polymer foam layer. The sandwich-like Structure of ECG sensors according to the invention allows in particular by the polymer foam layer an optimal connection between the electrode and the body of the patient or subjects largely independent of how this on the measuring mat is located. Due to the elasticity of the polymer foam is also with movements of the patient or subjects on the measuring mat always ensures that there is a connection between body and electrode.

A Variant of the measuring mat according to the invention provides that the measuring mat has a control unit for controlling the Measurements has. The advantage of the control unit is that the with the aid of the measuring mat according to the invention Measurements made the measurement parameters can be influenced and always to the particular Conditions given by the patient / subject, the environmental parameters and the scope of the measurement, be adjusted.

Especially It is advantageous according to the invention, if the control unit to separately control the sampling rate of each Measurement is formed. about the controller leaves In this way, for example, adjust that the pressure for a dynamic Pressure measurement, for example, several times per second measured and read whereas, the temperature is usually high in time less leaps and bounds, for example, read only once every minute becomes.

to increase the ease of use is provided according to a variant of the invention, that the measuring mat according to the invention an evaluation unit and / or a display unit. With Help the evaluation unit leaves For example, a compensation of the measured pressure values due to the simultaneously recorded temperature and / or humidity values To run. The display unit allows the graphical visualization of the recorded and possibly evaluated Readings. Particularly advantageous, the display of the desired Measured values take place in real time.

In a further advantageous embodiment of the measuring mat according to the invention it is provided that the display unit is designed for the preferably time-resolved graphic display of the area distribution of a desired measured value combination. For example, by using a suitable color code or a three-dimensional representation, the matrix of the measured values can be displayed over time in this way. This allows operators, such as medical personnel, to quickly assess the situation from a medical point of view.

Around To follow a single reading particularly accurately is according to a Variant of the invention, the display unit for displaying a temporal Course of a desired Measured value formed. For example, this can be done in this way Advantage of the time course of the pressure at a preselected location on the measuring mat in a graph. alternative or at the same time, for example, the temperature value represented in the same way in this place.

A such representation facilitates z. B. with advantage the evaluation of mutual influences of different from the measuring mat according to the invention recorded measured values.

at a special advantageous variant of the measuring mat according to the invention is the time course of the pressure difference between two selectable points on the surface displayable. In many applications it comes primarily to pressure gradients and less to absolute Pressure values. In these cases is the display of the time course of the pressure difference between two suitably chosen Points on the surface the measuring mat of large Advantage.

to Improvement of clarity the measurement setup on the patient or volunteer sees a beneficial embodiment The invention means for wireless data exchange between the measuring mat and the evaluation unit and / or the display unit. The at the recording of several different readings on the body of a Patients or subjects found in the prior art confusing Wiring diagram between measuring probe and evaluation unit and / or Display unit becomes effective with wireless transmission avoided.

Of the wireless data exchange is designed according to a variant of Invention particularly simple when the measuring mat according to the invention for the Data exchange has a transponder. If the transponder attached to a suitable place on the measuring mat, the Evaluation unit and / or the display unit this example for Expenditure of the desired Measurements are stimulated. The transponder can also be passive, d. H. without their own energy supply.

to increase the patient or proband comfort is an advantageous development the measuring mat according to the invention as a garment, in particular Shirt, educated. Especially in connection with a wireless Communication between the measuring mat and an evaluation and / or display unit This can significantly improve the comfort of the patient or subject become. It is also conceivable that the patient or subject with the formed as a shirt measuring mat according to the invention within the Transmission range is mobile. This opens up a number of possibilities such as the measurement of respiration on the basis of the pressure distributions, the heart rate over the ECG sensors, the temperature based on the temperature sensors or the sweating behavior over the moisture sensors on the patient or subjects, without this locally a mat would be bound. In the field of infant monitoring, especially for the prevention of sudden infant death, it is in Frame of the invention advantageous when the measuring mat in a sleeping bag for children is integrated or if the measuring mat itself designed as a sleeping bag is. That way Also make sure that the probes are as close to the body as possible Patients, volunteers or infants are located.

A especially cheap Embodiment of measuring mat according to the invention receives one, if each sensor line by means of a detachable plug connection preferably separately from the other sensor lines to the control unit and / or Evaluation unit is connectable. The advantage is that, for example individual lines can be excluded from the measurement. In addition, can Advantageously, the measuring mat exchanged, for example, for hygienic reasons without at the same time the electrical connection of the test leads must be solved with the data processing equipment. This can be special Be beneficial, provided different patients or subjects at one Test setup be investigated using a measuring mat according to the invention should.

The Invention is in a preferred embodiment with reference on a drawing by way of example, with further advantageous details the figures of the drawing can be seen.

Functionally same Parts are provided with the same reference numerals.

The Figures of the drawing show in detail:

1 : schematic representation of an embodiment of the measuring mat according to the invention with accessories

2 : Detail representation of the measuring mat according to the invention

3 : further detail of the sensor interconnection of the measuring mat according to the invention

4 : schematic representation of a trained according to the invention as a shirt measuring mat

5 : schematic representation of the structure of an electrode for use with the measuring mat according to the invention

6 : schematic representation of the functioning of the electrode 5

7 : Representation of a preferred display mode of the display unit of the measuring mat according to the invention

8th : Representation of another preferred display mode of the display unit of the measuring mat according to the invention

The 1 shows a measuring mat 1 , The measuring mat 1 has a pressure sensor matrix 2 on. Each point corresponds to the pressure sensor matrix 2 inside the measuring mat 1 a pressure sensor. The measuring mat 1 indicates its pressure sensor matrix 2 also additional ECG electrodes 19 on. The ECG electrodes 19 are about the pressure sensor matrix 2 on the measuring mat 1 arranged distributed. At the left edge of the measuring mat 1 there is a data bundle bar 5 , The data bundle bar 5 is with a transponder 6 connected. The transponder 6 is powered by a power adapter 7 energized. The power supply 7 further supplies the pressure sensor matrix 2 and the other sensors with energy. The transponder 6 can also be designed as a passive transponder without power supply. The transponder 6 sends over a radio link 8th Measurement data of the pressure sensor matrix 2 , as well as the other sensors to a portable computer 9 , The portable computer 9 can be a commercial computer. The computer 9 comes with a screen as well as a receiver for over the radio link 8th from the transponder 6 equipped with transmitted measuring signals. Instead of the radio link 8th can be used in the context of the invention equally as a cable connection for data exchange.

The 2 shows a detailed representation of the pressure sensor matrix 2 the measuring mat 1 out 1 , In addition to those in connection with the description of the figures 1 described elements are in the 2 single, the pressure sensor matrix 2 forming pressure sensors 10 shown. Further, at the output of each line 11 the pressure sensor matrix 2 one line multiplexer each 12 connected. The row multiplexers 12 are above the data bundle bar 5 with a matrix multiplexer 13 connected together. In the 2 are the additional ECG sensors 19 not shown.

3 schematically shows a circuit diagram of its geometric arrangement of the pressure sensor matrix 2 with the additional temperature sensors 3 or humidity sensors 4 , Like in the 3 to recognize is the pressure sensors 10 each a signal preprocessing electronics 14 downstream. Some points of the pressure sensor matrix 2 are in addition to the pressure sensor 10 with a temperature sensor 3 or a humidity sensor 4 Mistake. Both the signal of each temperature sensor 3 as well as the signal of each humidity sensor 4 also runs via the signal preprocessing electronics 14 , The pressure sensor matrix 2 forming circuit board 15 on which the pressure sensors are located 10 , Humidity sensors 4 as well as temperature sensors 3 are flexible. The output signals of the pressure sensors 10 , Temperature sensors 3 as well as humidity sensors 4 are about the signal preprocessing electronics 14 with the respective line multiplexer 12 connected.

It can be seen in the 3 in particular, that at every point of the sensor matrix 2 a pressure sensor 10 is attached and additionally in the in 3 shown section of the pressure sensor matrix 2 distributes a total of two temperature sensors 3 as well as two humidity sensors 4 at points of the pressure sensor matrix 2 are attached. Not shown in the figure are those at some points of the pressure sensor matrix 2 according to 1 attached ECG electrodes 19 , These are in principle analogous to temperature sensors 3 or humidity sensors 4 connected.

Finally, in the 3 to recognize that the signals of the line multiplexer 12 every line 11 via a plug connection 29a . 29b with the line signal line 16 are connected. There is every line 19 with a plug 29b provided in one in the respective row signal line 16 attached socket 29a is pluggable.

For operation of the measuring mat 1 becomes the measuring mat 1 For example, placed on the bed of a bed in a sleep laboratory or on the bed of a cot for purposes of monitoring against the background of sudden infant death. Subsequently, a test subject lies in the case of the sleep laboratory or a baby on the measuring mat 1 , About the power adapter 7 becomes the measuring mat 1 energized. The desired measurement parameters are via the portable computer 9 over the radio link 8th to the transponder 6 to the signal preprocessing electronics 14 over the matrix multiplexer 13 and the row multiplexers 12 parameterized. It will be on the computer 9 expediently, values are set via the sampling rate or the required signal dynamics and similar parameters. Also, in the calculator 9 a desired display mode is selected for the data to be measured.

To carry out the measurement, this is first on the computer 9 and the radio link 8th with a corresponding command to the transponder 6 started. The pressure sensors 10 Now convert that of the subject or the infant to the respective pressure sensor 10 the pressure sensor matrix 2 applied pressure in a measurement signal and send this to the signal preprocessing electronics 14 , In the signal preprocessing electronics 14 Each preprocessing steps, which may include, for example, a calibration or noise suppression filtering. That of the signal preprocessing electronics 14 preprocessed signal from each pressure sensor 10 is next to the line multiplexer 12 forwarded. Each line multiplexer 12 receives successively signals of all in the respective line 11 existing pressure sensors 10 , The output of the line multiplexer 12 is in a single row signal line 16 to the matrix multiplexer 13 forwarded.

Additionally, both measurements are via the temperature sensors 3 as well as the humidity sensors 4 Temperature or humidity signals converted into a measuring signal. This is also via the signal preprocessing electronics 14 at every point of the pressure sensor matrix 2 passed and subjected there to preprocessing. Again, preprocessing in the signal preprocessing electronics 14 z. B. include noise reduction and / or calibration. That in the signal preprocessing electronics 14 preprocessed signal from the temperature sensors 3 or humidity sensors 4 becomes analogous to the signals of the pressure sensors 10 to the input of the line multiplexer 12 directed. In the line multiplexer 12 the signal is combined with the signals of the individual pressure sensors 10 in the respective line 11 in the common line signal line 16 fed. The line signal line 16 every line 11 then in the matrix multiplexer 13 united into a single signal strand.

The unified signal at the output of the matrix multiplexer 13 will now be using the transponder 6 over the radio link 8th to the computer 9 Posted. In the portable computer 9 then the multiplexing is done 12 . 13 summarized signal back into the individual signals including the address information, that of which pressure sensor 10 or temperature sensor 3 or humidity sensor 4 a reading comes, decomposed.

This is then done using suitable evaluation methods in the portable computer 9 a compensation of the pressure sensors 10 sent pressure values with the values of the temperature sensors measured near them 3 or humidity sensors 4 , In this way one obtains a particularly reliable measurement result for each pressure sensor 10 the pressure sensor matrix 2 , Here, in particular, local variations of the humidity via the humidity sensors 4 as well as the temperature over the temperature sensors 3 taken into account in the evaluation.

In the 4 is a special embodiment of the measuring mat according to the invention 1 as a so-called sensor shirt 17 to recognize. The sensor shirt 17 Functionally corresponds to the measuring mat 1 in the previous figures. The sensor shirt 17 In particular, again comprises a pressure sensor matrix 2 , The structure of the pressure sensor matrix 2 the sensor shirt 17 corresponds to that in the 1 . 2 and 3 shown construction. In particular, are also in addition to the pressure sensors 10 several temperature sensors 3 as well as humidity sensors 4 via the pressure sensor matrix 2 arranged distributed. The sensor shirt 17 also includes two shoulder straps 18 , At one of the shoulder straps 18 is the transponder 6 attached and with the transponder 6 will be like in 1 illustrated over a radio link 8th Data exchange with a portable computer 9 carried out.

In addition to the mentioned pressure sensors 10 , Humidity sensors 4 as well as temperature sensors 3 includes the sensor shirt 17 ECG electrodes 19 , These are analogous to the temperature sensors 3 or humidity sensors 4 at points of the pressure sensor matrix 2 arranged.

If a subject or, for example, a baby or a patient, the sensor shirt 17 carries, stand the ECG electrodes 19 at least in part with the skin of the subject respectively infant or patient in a leading connection. Provided at least one suitable pair of ECG electrodes 19 is in sufficient conducting connection with the body of the subject, an ECG-accurate measurement of the heart rate can be performed via this pair. If, in the most favorable case, several pairs of ECG electrodes 19 are in a conductive connection with the subject's body, can be carried out comparative determinations of the ECG accurate heart rate or there is redundancy in the measurement. This increases the reliability of the ECG measurement with the sensor shirt according to the invention 17 ,

In the 5 is a detailed view of a preferred embodiment of the ECG electrode 19 shown schematically. As can be seen in the figure, the ECG electrode comprises 19 on the outside an insulating layer 20 , which is associated with the body of the subject. On the side facing away from the body of the insulating layer 20 there is a silver layer 21 , which in turn on a conductive closed polymer foam layer 22 is arranged. End of the polymer foam layer facing away from the body 22 is located a signal preprocessing electronics 14 , The signal preprocessing electronics 14 and the body facing away from the body portion of the polymer foam layer 22 are within one version 23a , The construction described allows a capacitive long-term measurement of the ECG.

The 6 illustrates the benefits of in 5 illustrated ECG electrode 19 compared to a conventionally constructed electrode. In part (a) of the 6 is to recognize how the skin 23 through the rigid metal electrode 21a through one in the skin 23 hair 24 is strongly pressed. This leads to a bad contact of the skin 23 with the rigid metal electrode 21a , The situation shown in Figure (a) corresponds to a conventional ECG electrode 19 , In contrast, in the figure (c) is also schematically a skin section 23 with a hair 24 shown. However, here is the modern ECG electrode according to the invention 19 with the in 5 used shown multilayer structure. As can be seen, the additional polymer foam layer is used 22 to a uniform contact of the electrode 19 with the skin 23 , The polymer foam layer 22 hugs the hair 24 around.

Part (b) of the 6 shows the situation if the rigid metal electrode 21a in conventional electrode construction, not parallel to the skin 23 is aligned. In this case, as can be seen, also a very bad contacting of the rigid metal electrode 21a with the skin 23 to complain. In contrast, it can be seen in part (d) of the figure that due to the polymer foam layer according to the invention 22 in the ECG electrode 19 a good fitting of the electrode 19 to the skin 23 results, although the silver layer 21 is inflexible and not parallel to the skin 23 is aligned.

The 7 shows a preferred display mode within serving as a display and Auswertegerätes portable computer 9 , There is the two-dimensional representation of the measured values of the pressure measurement matrix 2 selected. The illustrated pressure gauge matrix 25 shows in the form of an indicated by contours color coding the pressure values at each location of the pressure sensor matrix 2 , A dynamic representation of the time course of the pressure distribution is also possible. In this case, the instantaneous values of the pressure distribution pertaining to the selected sampling rate for the determination of the pressure measured values are played back in chronological order, similar to a film.

The 8th shows another preferred possible display mode within the portable computer serving as a display device 9 , In the time graph 26 is the course of a through a pressure sensor 10 shown in the thorax of the subject measured pressure value over time. The horizontal axis 27 corresponds to the time axis, whereas the vertical axis 28 the pressure axis corresponds.

This display mode is particularly suitable for tracking the time history of a single selected measurement point. Instead of depicting the pressure of the thorax, which has been shown here by way of example, the pressure difference between any two pressure sensors can also be used, for example 10 being represented.

Equally, however, the course, for example, the temperature, as he of a temperature sensor 3 was measured, or the humidity, as measured by a humidity sensor 4 was measured.

In the graph of 8th is due to the representation of the pressure readily recognizable that due to the high sensitivity of the pressure sensor 10 The pressure can be measured so accurately that even the respiratory movement of the subject emerges as a periodic oscillation. The measuring mat according to the invention 1 is therefore particularly suitable for monitoring the respiration of the subject or patient.

With the abovementioned preferred embodiments of the measuring mat according to the invention, a measuring mat was thus provided for measuring a pressure distribution on its surface with a large number of pressure sensors arranged distributed over the surface 10 proposed, with which a particularly accurate pressure measurement is possible, and with which overall monitoring of patients or subjects is particularly efficient and clearly designed.

Possible applications the measuring mat according to the invention are the design of the measuring mat as measuring sleeping bag for children, the use as a measuring mat for Examinations in the sleep laboratory, the intraoperative and postoperative monitoring of patients, microclimate measurements or the pressure analysis while lying, sitting or standing. The measuring mat according to the invention is particularly suitable for long-term monitoring of the collected parameters. Further Applications are in the field of orthopedic rehabilitation. In addition, can the measuring mat according to the invention be integrated into an anti-decubitus system.

1

measuring mat

2

Pressure sensor matrix

3

temperature sensor

4

humidity sensor

5

Data bundling bar

6

transponder

7

power adapter

8th

radio link

9

portable computer

10

pressure sensor

11

row

12

row multiplexer

13

matrix multiplexer

14

Signalvorverarbeitungselektronik

15

flexible circuit board

16

Row signal line

17

Sensor-Shirt

18

shoulder straps

19

ECG electrode

20

insulating

21a

metal electrode

21

silver layer

22

Polymer foam layer

23a

version

23

skin

24

hair

25

Pressure Indicator Matrix

26

time graph

27

timeline

28

pressure axis

29a

Rifle

29b

plug

Claims (18)

Measuring mat ( 1 ) for measuring a pressure distribution on the surface thereof with a multiplicity of pressure sensors distributed in a planar manner ( 10 ) for medical diagnostics, characterized in that they include sensors ( 3 . 4 ) for measuring a temperature and / or a humidity. Measuring mat ( 1 ) according to claim 1, characterized in that multiplexer ( 12 . 13 ) are provided for bundling the measured values Measuring mat ( 1 ) according to claim 1 or 2, characterized in that a plurality of surface distributed distributed temperature sensors ( 3 ) is provided. Measuring mat ( 1 ) according to one of claims 1 to 3, characterized in that a plurality of surface distributed moisture sensors ( 4 ) is provided. Measuring mat ( 1 ) according to one of the preceding claims, characterized in that sensors ( 10 ) are provided for measuring an electrocardiogram (ECG). Measuring mat ( 1 ) according to claim 5, characterized in that a plurality of areal distributed ECG sensors ( 19 ) is provided. Measuring mat ( 1 ) according to claim 5 or 6, characterized in that the ECG sensors ( 19 ) have a dry electrode. Measuring mat ( 1 ) according to one of claims 5 to 7, characterized in that the ECG sensors ( 19 ) at least one insulating layer ( 20 ), a silver layer ( 21 ) and a conductive closed polymer foam layer ( 22 ) exhibit. Measuring mat ( 1 ) according to one of the preceding claims, characterized in that it comprises a control unit ( 9 ) for controlling the measurements. Measuring mat ( 1 ) according to claim 9, characterized in that the control unit ( 9 ) is designed to separately control the sampling rate of each measurement. Measuring mat ( 1 ) according to one of the preceding claims, characterized in that it comprises an evaluation unit ( 9 ) and / or a display unit ( 9 ) having. Measuring mat ( 1 ) according to claim 11, characterized in that the display unit ( 9 ) for the preferably time-resolved graphical display of the area distribution ( 25 ) of a desired combination of measured values is formed. Measuring mat ( 1 ) according to claim 11 or 12, characterized in that the display unit for displaying a time course ( 26 ) of a desired measured value is formed. Measuring mat ( 1 ) according to one of claims 11 to 13, characterized in that the time profile of the pressure difference between two selectable points on the surface can be displayed. Measuring mat ( 1 ) according to one of the preceding claims, characterized in that means ( 6 ) for wireless data exchange between the measuring mat ( 1 ) and the evaluation unit ( 9 ) and / or the display unit ( 9 ) are provided. Measuring mat ( 1 ) according to claim 15, characterized in that it has a transponder for data exchange ( 6 ) having. Measuring mat ( 1 ) according to one of the preceding claims, characterized in that they as a garment, in particular shirt ( 17 ), is trained. Measuring mat ( 1 ) according to one of the preceding claims, characterized in that each sensor line ( 11 ) by means of a detachable plug connection ( 29a . 29b ) preferably separate from the other sensor lines ( 11 ) with the control unit ( 9 ) and / or evaluation unit ( 9 ) is connectable.