WO1990000031A1 - Transducer for measurement of vertical foot forces - Google Patents

Transducer for measurement of vertical foot forces

Info

Publication number
WO1990000031A1
WO1990000031A1 PCT/DE1989/000444 DE8900444W WO9000031A1 WO 1990000031 A1 WO1990000031 A1 WO 1990000031A1 DE 8900444 W DE8900444 W DE 8900444W WO 9000031 A1 WO9000031 A1 WO 9000031A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
signal
pressure
value
device
heel
Prior art date
Application number
PCT/DE1989/000444
Other languages
German (de)
French (fr)
Inventor
Ulrich Boenick
Original Assignee
Effner Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/103Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/1036Measuring load distribution, e.g. podologic studies

Abstract

A transducer for measurement of vertical foot forces comprises a pressure sensor arranged in the tread region of a shoe or a plurality of pressure sensors distributed over the tread surface. The pressure sensors act as signal convertors which convert mechanical pressures to electrical signals, and the output signal of the pressure sensor or the combined output signals of a plurality of pressure sensors are an index of the integral of the vertical forces acting on the tread region.

Description

Measuring device for forces gig

Description

The invention relates to a measuring device for Auftritts- forces of the type indicated in the preamble of claim 1.

As part of the rehabilitation, it is necessary to control the Bela¬ stung the occurrence. In particular, it is desirable that these forces exceed a predetermined value regularly so that the patient takes the limbs wiederherge¬ also featured regularly in use and does not seek to avoid it because of stress in the stress pain or the like, or any other inconvenience. On the other hand, the forces are to be kontrol¬ prominent also in terms of its maximum value, so that, for example after implantation of bone replacement parts occurs no overload.

is known in the trade journal "orthopedic Tech¬ nik" Nr. 9/76, pages 179-182 by K. Nicol and arrangement for measuring the timing of the appearance of a force by means of at least one plate capacitor formed gelhardt described ene A. mat or shoe sole. Measured variable is the pressure of the force-dependent change in the spacing between the plates corresponding change in capacitance. With this measuring device, however, only local Druckkraft¬ are pointed by optical or acoustic display recognizable. However, crucial for assessing the actual Bela¬ stung the lower extremities of the patient is the total load on the sole.

The invention disclosed in claim 1 has the object to provide a measuring device which in ei¬ einfa¬ chem structural design and ease of handling allows ne reliable control of the tienten Gehapparat Pa¬ the applied loads.

This object is achieved with the features indicated in the characterizing part of the entitlement An¬ l measures. The invention is based on the recognition that the load of the lower extremities sum by one or more Druck¬ receiver is determined which distributed over the tread surface which has occurred in the area of ​​the pressure receiver local loads and register the determined SUMMA tion value or evaluate. In this way it is possible to detect the transferred into the body via the respective leg joints including the relevant forces safely. This detection is carried out regardless of the type of occurrence, and a possibly preferably chosen by the patient load zone of the ball or the heel.

According to a first advantageous embodiment of the inventions, the pressure transducer are formed as fertil piezoceramic disks aus¬, wherein the integration by means of additional Schalt¬ medium in the heel and ball portion can be made separately. Is advantageously provided for each hen a measured value, which is preferably constructed as a peak value memory for a measurement area associated region. For more precise discrimination a threshold circuit is connected upstream of the Spitzenwert¬ store, wherein the storage by the respective relief is gesteu¬ ert.

For the information of the patient for targeted Beeinflus¬ solution of the loading and / or unloading these is shown an¬ respectively by an optical and / or acoustic signal transmitter.

Conveniently, a histogram memory is provided, which for different classes of appearance forces weils JE a counter having. In this case, also a counter for the total number of occurrences of each surface is provided or associated areas.

According to another advantageous embodiment of the invention is a single, insbesonderer film-like, a pressure transducer is provided which, as a distance, in particular folien¬ shaped plate capacitor with pressure-dependent Platten¬ is formed. Here, the integration by the uniform film itself is made so that the extent omitted additional external circuits, integrators or Summier¬.

In order to compensate for large local loads occurring nearitäten nonlinearities are at a corresponding advantageous further to reduce the Flächen¬ dependence of the measurement signal, the capacitor in the Be¬ range to the largest expected the localized Flä¬ chenpressung provided with recesses. This concerns in particular the heel and ball area.

The electrical components for the implementation of plattenab- was dependent capacitance in a Freguenzänderung, vor¬ preferably a Resonant or oscillator assembly are arranged as on a copper board soldered surface mount component in the region of a recess.

Other electrical components are housed in an auxiliary device which is connected via a connector and an electrical lead to the output of the SMD component ver¬. Preferably as a handheld device formed accessory takes more particularly to a frequency-to-voltage converter, to which a threshold value circuit, a timer and an audible and / or optical signal transmitters are nachge¬ on.

By separating the evaluation unit and Signalaufnähme- the former may be ausge¬ staltet as a disposable component preferably so that hygienic measures the Wieder¬ use may be omitted in another patient.

The inventive device can be used as shoe soles or Einlege¬ Galosche be formed, wherein the supply Befesti¬ preferably by means of a Velcro strip is carried out.

A battery pack for power supply and / or elektro¬ African components for signal processing can be seen vor¬ preferred but also within the sole or heel area.

Advantageous developments of the invention are characterized in the subclaims and zu¬ hereinafter together with the description of the preferred embodiments of the invention are illustrated in more detail with reference to FIGS. Show it:

Figure 1 shows an embodiment of the measuring device according to the invention in side view,

2 shows the embodiment according to FIG 1 in the An¬ view from below,

3 shows a block diagram of the signal processing part of the measuring device, Figure 4 a second embodiment of the invention in the view ge Mäss Figure 2,

5 shows a cross section through the Meßsohle according to FIG 4, and

Figure 6 is a block diagram of the signal processing part of the second embodiment of the measuring device according to the invention.

In the illustrated embodiment in Figure 1 as a shoe design of the device according to the invention transducers 4 are provided in a sole 2 and in a shoulder 3 druckempfindli¬ che, the precise arrangement of the top view of Figure 2 can be seen. The converter Druck¬ form piezokera ical discs which utilization at Druckbe- proposed an electric voltage, the issue in the wesent¬ proportional to the pressure force exerted on the round surface.

The shoe 1 can be worn as a sandal, and is closed in this case by a Velcro strip. 5 but there are suitable as footwear inclusion of other relevant training. In the heel region between the heel and foot pad 6 there is a space 7, which serves for receiving batteries and electronic devices. At the back of the heel but a plug receptacle is provided, in which a plug 8 can be inserted, which in turn is connected via an electrical lead 9 with egg nem display 10 which is controlled by a key 11 cyclically one after the various measurements off. In this case, read out within one of the electronic part vorge overlooked memory, gives the information about the wäh¬ rend the use of the shoe 1 occurred Auftritts¬ forces. In normal operation shoe l and display 10 are separated from each other. The display is used by the Rehabi¬ be monitored litation patient person, so be¬ is usually found in the doctor's hand.

participants 4 evenly distributed from the arrangement of the various circular pressure buildup in sole and heel region it appears that at all opportunities to perform the transmitted compressive forces are completely detected. What is important here is that the pressure transducers 4 are arranged so that the transmission of force between the encryption schleißschichten in the sole and heel region 12 and 13 takes place exclusively via the pressure receiver, so that the adjacent to the pressure receiver above and below an¬ are layers so stable that they do not deform such that it can pass between the preferably round pressure transducer and can be laid on each other for power transmission (parasitic).

Due to the substantially circular pressure converter the advantage that on the one hand a relatively preisgünsti- ges pressure transducer element, which is very industrially produced, is available at low cost is obtained. Characterized in that the presence areas are covered mosaic abge¬ of these elements, there is sufficient flexibility of the tread portion to allow a rolling orthopedic necessary when walking in the sole or heel. Thus, when the sensors containing the sole and the heel is components with sandwichar¬ TIGEM structure in which adjoin a flexible wear layer, the transducer and the appearance forces receiving basic structure of the shoe 1 in the form of a entspre¬ sponding shaped body. The Meßwertaufneh¬ mer 4 are arranged ange¬ the foot immediately adjacent as possible, that is located at the top of the Sohlen¬ or heel region of the shoe. 1

In the example shown in Figure 3 embodiment of a circuit for signal processing of the output signals of the transducers 4 are each separately for the sole section 2 and the heel region 3 summing circuits 14 and 15 conces- leads, adding the outputs of the signal converter so that the analog value of the output signal proportional to for impinging on the sole or heel area Ge samtkraft as the integral of the local pressure values ​​is - and regardless of which part of the range, the cornering force is exerted.

The outputs of the stages 14 and 15 are supplied to analog-to-digital converters 16 and 17, wherein the digitali¬ overbased signals in turn reach maximum value memories 18 and 19, respectively, which in a corresponding memory location in each case hold the largest occurred signal value. Thus, the internal logic of this circuit includes chermittel Verglei¬ which determine whether the input is at the rising anste¬ digital value greater than, the stored. If this condition, the stored value is replaced by the standing at the entrance. The maximum value memory 18 and 19 are respectively fitted over zurückge¬ "Reset" inputs which are addressed after each Belastungszy¬ klus (appearance).

The outputs of the maximum value memory 18 and 19 ge long to a comparator 20 which provides an output signal ( "high) outputs when the digital value predominates in the memory 18 by the comparator 20, a switching stage 21 is driven, which the function of the output signal. comparator 20 either allows the digital output signal of the maximum value memory 18, or that of the entspre¬ sponding memory 19 to the output of the switch 21 ge long. the output signal of the switch 21 is supplied ei¬ nem addresser 22 as an input signal, which signal by the addresser in an address signal of a memory 23 is converted, which consists of a series of counters which are incremented each by an associated the betref¬ fenden counter clock signal by "1". in the illustrated embodiment, four counters are provided corresponding to different Belastungsεtufen and each of which the addresser in Abhängig¬ speed of de r is encountered load (ximalwertspeicher according to the ma-) delivers a control signal as a clock signal zuge¬. The clock signal for incrementing the addressed overbased counter in the memory 23 is formed by two Schwell¬ wertstufengleiche produced 24 and 25, .werden supplied to an AND gate 26 whose output signals. Falls below the digi¬ tale output signal of the analog-to-digital converter 16, 17 a predetermined value, the stung a complete unloading corresponds to the pressure sensor, so give the Schwell¬ wertstufengleiche 24 and 25, this signal state characterize sierendes logic signal, wherein when both regions (sole and heel) are unloaded, a signal is output from the aND gate 26, which forms the corresponding Taktsig¬ nal for the memory 23rd The memory 23 represents egg NEN histogram memory whose counter readings of these individual counters, the frequency of occurrence vorbe¬ certain pressure values ​​(appearance forces) to play.

By the clock signal as an output signal of the AND gate 26, the maximum value memory 18 and 19 so that they are ready for each discharge is reset for a new appearance force measurement simultaneously.

The output signal of the comparator 20 is optionally supplied as an additional address signal to the addresser 22nd It contains information as to whether the maximum value out of the heel or in the sole area comes. If the counters are areas of memory 23 divides ge into two groups, one each pressure value can be absolute (ie irrespective of whether it occurred in the heel or in the sole area) sort. In the other group of counters er¬ registration follows only in association with the place, which reached the maximum value, for example, here in Soh¬ lenbereich. From the number of rich for a digital value adjustments registered by appearance forces in the respective counters of the counter group values, that can be in the later reading out an assignment meet the range in which the respective load numbers occurred, so that a more detailed analysis of the performance behavior of patent tienten is possible. Here, any group of pressure transducers logical individual counter areas can be assigned. For this purpose, in each case for a group of such pressure transducers, a corresponding summer would provide 14 or 15 with the downstream maximum value memory.

To read out the data stored in the counter 23 values, the display unit 10 is verbun¬ to the output of the counter to. The key 11 outputs a clock signal for a counter 24, which, when inserted readout part (display 10) outputs an address signal, which replaces the output signals of the stages 21 and 20th By cyclically pressing the button 11 and the out taking place changing the Zäh¬ toddlers tandes the counter 24 all Zäh¬ can be cyclically interrogates lerstände so that the doctors the possibility is gege¬ ben who desired overall after a presettable period of use query "information . the boundaries between the individual count ranges in the histogram can verzugs¬, be provided in gradations of 25 N.

Figures 4 and 5 illustrate another example of managerial off Meßsohie invention as Darstel¬ development in plan view and in cross section.

Here, a single pressure transducer for the entire Auf¬'s exit surface provided. This is formed as a plate capacitor 27 with pressure dependent plate spacing. The cross-sectional view of Figure 5 shows that the Konden¬ sator of three plates 28, 29 and 30 is comprised, which are separated from each other by two dielectric acting as foam rubber layers 31 and 32nd In the middle of the Meßsoh- le, the one pole of the capacitor is forming plate 28, while the two outer plates 29 and 30 form the opposite pole. The capacitance is thus between the middle 28 and two outer plates 29 and 30 er¬ averages. The plates 28, 29 and 30 consist of plastic films coated leit¬ enabled material. This is preferably gold or silver bedampf¬ te films such as capacitors and for producing films-Kon¬ are common.

Under load, the sole is compressed, so that the distance between the plates is reduced and the capacity of the enlarged Kon¬ densators. This capacitance change is the signal to be evaluated. The electrically positive film 28 has in the regions of the heel and of the bale Ausspa¬ 33 and 34 posts, whereby the areas of extreme surface pressure, the rity the measurement result due to the Nichtlinia- wür¬ distort the pressure dependence of the capacitance to are eliminated. Instead of a larger recessed portion that is smaller but as the Auf¬ occurs zone (ie, the entire contact area of ​​the foot with the sole) when placed in the heel or ball region, can also in each case a plurality of smaller cutouts to be hen vorgese¬, which then also can exceed this area. The design of these areas is take so vorzu¬ in each case that the change in capacitance achieved in the essential surfaces independently of the surface on which the distributed Auf¬ stepping force.

The electrical components for converting the Kapazi¬ tätsänderung into a frequency change, for example, a resonant circuit or an oscillator are soldered as an SMD component 35 on a copper foil board and arranged in the region of the Ferεenaussparung 33, outside the relevant for the Detek- tion measurement range. Accordingly, they can also be provided in the area of ​​the toes. The SMD component 35 is part of the designed as a disposable part sole. Via a connector 8 on the heel of the Meßschuhs and a cable 9, the SMD component 35 is connected to a handset 36, which also receives other electrical components for Signalauswer-ung.

Figure 6 shows the essential components for Signal¬ evaluation in a block diagram. The frequency change signal generated by the SMD assembly 35 is converted zu¬ next by means of a frequency-voltage converter 37 (in the form of a VCO) into a DC voltage signal which is smoothed by a first order low-pass filter. This Ausgangεεignal the circuit 37, which forms a measure for the stepping force is a Schwellwert¬ circuit 38 and this signal is supplied via a Zeit¬ member 39 and integrated, so that s provides a pulse on the order of 0.1 to first respectively, an oscillator 40 is driven, for this period, the gnalimpuls modulates the Si¬ as Tonεignai and drives a speaker 41st The speaker 41 causes at Über¬ falls below a threshold value by means of the single adjustable limit load beeps with a duration that is determined by the timer. 39

So that the patient receives feedback about the er¬ handed landing force. As tests have shown, a patient is very good to measure its performance able strength so that the value at which a signal is heard is exceeded only marginally and therefore lies within the permissible load in rehabilitation. By a further corresponding Schwellschaltung but also (additionally Liehe) upper threshold may in another embodiment of the invention are provided, is prevented from a signal output from the. In this case, only one landing force in the intended target area to ei¬ nem acoustic signal leads.

The invention is not limited in its embodiment to the above-described preferred exemplified embodiment. Rather, a number of variants which make use of the described solution even for basically different configurations. * * * * *

Claims

Claims
1. Measuring device for Auftrittεkräfte with a passage region of a shoe disposed in the Auf¬ pressure receiver or more distributed angeord¬ Neten pressure recipients through the tread area, wherein the pressure transducer signal converter for converting mechanical Tr ckwerten in elek¬ trical signals form,
characterized ,
that the output signal of a pressure receiver or zu¬ sammengeführten output signals of several pressure receiver (4) a measure of the integral of the pressure forces occurring on the tread area bilden.-
2. A measuring device according to claim 1, dadurchge - indicates that the pressure receiver (4) is ausσebildet as a piezo ceramic disc or as a plate capacitor with ela¬ stischem dielectric.
3. A measuring device according to claim 2, ¬ dadurcnge denotes that a Fußsohle- of 'matched plate capacitor (27) with recesses (33 and 34) in the heel and the ball region is provided.
4. Measuring device according to one of the preceding che Ansprü¬, dadurchgekezeichet, data at least a part of the electrical components as on a copper foil soldered SMD component (35) is ausgebil¬ det, which in the region of a recess (33) and an intermediate space of or the pressure receiver is located.
5. Measuring device according to one of the preceding claims An¬, characterized in that the pressure receivers a Resonant or oscillator is connected downstream module (35) for converting the capacitance into a Fre¬ quenzänderung.
6. Measuring device according to one of the preceding Ansprü- before, characterized in that the pressure receiver and an optionally arranged in the region of the sole circuit via a plug connection (8) and with a hand-held device (36) which (a frequency-voltage converter 37 ) to which a threshold circuit (38), a timer (39) and a aku¬-extremist and / or optical signal generator are nachgeεchaltet.
7. Measuring device according to one of the preceding Ansprü¬ che, characterized in that a plurality of pressure receiver is hen (4) having surface (2, 3) each include a summer or integrator (14, 15) vorgese¬.
8. Measuring device according to one of the preceding claims, characterized in that the Ein¬ storage of the determined measurement signals in a memory by a circuit (24, 25) is triggered to determine the respective discharge gen.
9. Measuring device according to one of the preceding claims, characterized in that the ER-rich or exceeding of a predeterminable or fixed lower or upper load value by an optical and / or acoustic signal transmitter (10) is displayed.
che 10. Measuring device according to one of the preceding Ansprü¬, nn dadurchgeke characterized in that a, in particular designed as a histogram memory, memory (23) is provided, which for various Be¬ reichsk-Lasse.-: each includes a counter of occurrence forces.
II. Measuring device according to one of the preceding Ansprü¬ che, adurchgekennzeichnet that a counter (23) is vorαesehen for the total number of performance events.
che 12. Measuring device according to one of the preceding Ansprü¬, characterized in that the pressure sensor (2) at the top of the sole or heel of the shoe near the surface are arranged.
13. Measuring device according to one of the preceding che Ansprü¬, characterized in that the fixing takes place by means of a Velcro strip (5).
* * * * *
PCT/DE1989/000444 1988-07-01 1989-07-03 Transducer for measurement of vertical foot forces WO1990000031A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DEP3822767.3 1988-07-01
DE3822767 1988-07-01
DE19883827999 DE3827999A1 (en) 1988-07-01 1988-08-15 Measuring device for auftrittskraefte
DEP3827999.1 1988-08-15

Publications (1)

Publication Number Publication Date
WO1990000031A1 true true WO1990000031A1 (en) 1990-01-11

Family

ID=25869776

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1989/000444 WO1990000031A1 (en) 1988-07-01 1989-07-03 Transducer for measurement of vertical foot forces

Country Status (3)

Country Link
EP (1) EP0377714A1 (en)
DE (1) DE3827999A1 (en)
WO (1) WO1990000031A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5344408A (en) * 1993-08-06 1994-09-06 Becton, Dickinson And Company Break-away safety shield for needle cannula
DE9406117U1 (en) * 1994-04-13 1994-09-08 Dekumed Ges Fuer Kunststoff Un Insole with load monitoring
WO1995012352A1 (en) * 1993-11-04 1995-05-11 Paromed Medizintechnik Gmbh Device and process for ulcer prophylaxis and early recognition of neuropathy in the foot of a diabetic
ES2070692A2 (en) * 1992-11-17 1995-06-01 Univ Politecnica De Valencia I Soles instrumented to measure pressures
WO1995014430A1 (en) * 1993-11-22 1995-06-01 Della Ca Pietro Method for determination of the weight of human body and device for performing the method
DE102014104698A1 (en) 2014-04-02 2015-10-08 Ryszard Bukszynski Device for measuring the landing force of a foot when walking

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4135940A1 (en) * 1991-10-31 1993-05-06 Anselm Dipl.-Ing. Futterer (Fh), 7483 Inzigkofen, De Electronic circuit for foot pressure warning appts. - generates warning signal when pressure detected by sensor mounted in heal of plaster cast exceeds limit
DE4316992A1 (en) * 1993-05-21 1994-04-21 Daimler Benz Ag Load measuring appts. for measuring load on legs of vehicle crash test dummy - contains force measurement sensors mounted in measurement plates on heel and sole of measurement shoe
DE4442930A1 (en) * 1994-12-02 1996-06-05 Wolfgang Singewald Orthopaedic joint support
DE19612334A1 (en) * 1995-04-04 1997-01-02 Thomas Dipl Ing Thomann Foot overload warning device for patients after leg or hip operations
DE19521080A1 (en) * 1995-06-09 1996-12-12 Mex & Wonisch Gmbh & Co Kg Monitoring unit for medical and/or therapeutic purposes using electronic sensor
DE29604379U1 (en) * 1996-03-09 1997-07-17 Taut Werner Device for monitoring the load of the human leg following a osteosynthesis
DE19751878A1 (en) * 1997-11-22 1999-05-27 Sonja Lange Indication system for occurrence of loading on foot or leg e.g. for rehabilitation, therapy and athletic research
DE19804443A1 (en) * 1998-02-05 1999-08-19 Rausch Load detection arrangement for leg of patient
EP1419734A1 (en) * 2002-11-13 2004-05-19 Fritz Minke GmbH & Co. KG Foot overload monitoring device

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WO1988008275A1 (en) * 1987-04-29 1988-11-03 Helmut Huberti Device for monitoring loads exerted on parts of the body

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Title
Biomedizinische Technik, Band 28, Nr. 10, Oktober 1983 (Berlin, DE) W. BRUNNER et al.: "Kapazitives Druckverteilungsmesssystem fur hohe Messstellendichte", seiten 221-224 *
Biomedizinische Technik, Band 31, Nr. 1/2, Januar-Februar 1986 (Berlin, DE) B. KURZ et al.: "Portables Druckverteilungsmesssystem fur Biomechanische Gangspuranalysen", seiten 19-24 *
Medical and Biological Engineering and Computing, Band 16, Nr. 5, September 1978, IFMBE, (Stevenage, Herts, GB) S. MIYAZAKI et al.: "Limb-Load Alarm Device for Partial-Weight-Bearing Walking Exercise", seiten 500-505 *
Medical and Biological Engineering and Computing, Band 22, Nr. 4, Juli 1984, IFMBE, (Stevenage, Herts, GB) S. MIYAZAKI et al.: "Capacitive Transducer for Continuous Measurement of Vertical Foot Force", seiten 309-316 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2070692A2 (en) * 1992-11-17 1995-06-01 Univ Politecnica De Valencia I Soles instrumented to measure pressures
US5344408A (en) * 1993-08-06 1994-09-06 Becton, Dickinson And Company Break-away safety shield for needle cannula
WO1995012352A1 (en) * 1993-11-04 1995-05-11 Paromed Medizintechnik Gmbh Device and process for ulcer prophylaxis and early recognition of neuropathy in the foot of a diabetic
WO1995014430A1 (en) * 1993-11-22 1995-06-01 Della Ca Pietro Method for determination of the weight of human body and device for performing the method
DE9406117U1 (en) * 1994-04-13 1994-09-08 Dekumed Ges Fuer Kunststoff Un Insole with load monitoring
DE102014104698A1 (en) 2014-04-02 2015-10-08 Ryszard Bukszynski Device for measuring the landing force of a foot when walking
DE102014104698B4 (en) * 2014-04-02 2015-12-10 Ryszard Bukszynski Device for measuring the landing force of a foot when walking

Also Published As

Publication number Publication date Type
EP0377714A1 (en) 1990-07-18 application
DE3827999A1 (en) 1990-01-11 application

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