EP0377714A1 - Dispositif de mesure des forces exercees pendant la marche - Google Patents

Dispositif de mesure des forces exercees pendant la marche

Info

Publication number
EP0377714A1
EP0377714A1 EP19890907095 EP89907095A EP0377714A1 EP 0377714 A1 EP0377714 A1 EP 0377714A1 EP 19890907095 EP19890907095 EP 19890907095 EP 89907095 A EP89907095 A EP 89907095A EP 0377714 A1 EP0377714 A1 EP 0377714A1
Authority
EP
European Patent Office
Prior art keywords
measuring device
pressure
signal
area
sole
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP19890907095
Other languages
German (de)
English (en)
Inventor
Ulrich Boenick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Effner GmbH
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
Application filed by Effner GmbH filed Critical Effner GmbH
Publication of EP0377714A1 publication Critical patent/EP0377714A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/1036—Measuring load distribution, e.g. podologic studies

Definitions

  • the invention relates to a measuring device for occurrence forces of the type specified in the preamble of claim 1.
  • the object of the invention specified in claim 1 is to provide a measuring device which, with a simple structural design and simple handling, enables reliable control of the loads acting on the patient's walking apparatus.
  • the invention is based on the knowledge that the load on the lower extremities can be determined by one or more pressure receivers which, distributed over the tread area, add up the local loads which have occurred in the area of the pressure receivers and register or evaluate the determined sum value. In this way it is possible to reliably detect the forces transferred into the trunk via the respective leg including the relevant joints. This detection is carried out regardless of the type of occurrence and a loading area of the ball or heel that may be preferred by the patient.
  • the pressure receivers are designed as piezoceramic disks, the integration being able to be carried out separately by additional switching means in the heel and ball area.
  • a measurement value memory which is preferably designed as a peak value memory, is advantageously provided for an area assigned to a measurement surface. For more precise discrimination, the peak value memory is preceded by a threshold circuit, the storage being controlled by the respective relief.
  • a histogram memory is advantageously provided, which is used for different classes of appearance forces. because it has a counter.
  • a counter for the total number of occurrences is also provided or assigned to individual surface areas.
  • a single, in particular film-shaped, pressure receiver is provided, which is designed as a, in particular film-shaped, plate capacitor with a pressure-dependent plate spacing.
  • the integration is carried out by the uniform film itself, so that additional external integrators or summing circuits are not required.
  • the capacitor is provided with cutouts in the area of the greatest expected locally limited surface pressure in a corresponding advantageous further development to reduce the surface dependency of the measurement signal. This applies in particular to the heel and ball area.
  • the electrical components for converting the capacitance dependent on the board spacing into a frequency change are arranged as an SMD component soldered onto a copper board in the region of a cutout.
  • an additional device which is connected to the output of the SMD component via a plug connection and an electrical line. That is preferably designed as a handheld device
  • the additional device in particular accommodates a frequency-voltage converter, which is followed by a threshold circuit, a timing element and an acoustic and / or optical signal transmitter.
  • the former can preferably be designed as a disposable component, so that hygienic measures before reuse in another patient can be omitted.
  • the device according to the invention can be designed as a shoe, insole or galoshes, wherein the attachment is preferably carried out by means of a Velcro strip.
  • a battery part for the power supply and / or electronic components for signal processing can, however, preferably also be provided within the sole or the heel area.
  • FIG. 1 shows an embodiment of the measuring device according to the invention in side view
  • FIG. 2 shows the exemplary embodiment according to FIG. 1 from below
  • FIG. 3 shows a block diagram of the signal processing part of the measuring device according to the invention
  • FIG. 4 shows a second exemplary embodiment in the view according to FIG. 2,
  • Figure 5 shows a cross section through the measuring sole according to Figure 4.
  • Figure 6 is a block diagram of the signal processing part of the second embodiment of the measuring device according to the invention.
  • pressure-sensitive signal converters 4 are provided in a sole 2 and in a heel 3, the exact arrangement of which can be seen from the top view according to FIG.
  • the pressure transducers form piezoceramic disks which, when subjected to pressure, emit an electrical voltage which is essentially proportional to the compressive force exerted on the round surface.
  • the shoe 1 can be worn as a sandal and is closed in this case by a Velcro 5.
  • other appropriate training courses are also suitable as footwear.
  • In the heel area between the heel and the footrest 6 there is a space 7 which is used to hold batteries and electronic components.
  • a plug receptacle into which a plug 8 can be inserted which in turn is connected via an electrical feed line 9 to a display 10 which, controlled by a button 11, cyclically outputs different measured values one after the other. gives.
  • a memory provided inside the electronic part is read out, which provides information about the occurrence forces occurring during the use of the shoe 1.
  • shoe 1 and display 10 are separated from one another. The display is used by the person monitoring the rehabilitation of the patient, and is therefore usually in the hand of the doctor.
  • the pressure transducers 4 are arranged in such a way that the force between the wear layers in the sole and heel areas 12 and 13 is transmitted exclusively via the pressure receivers, that is to say those adjacent to the pressure receivers above and below Layers are so stable that they do not deform in such a way that they can get between the preferably round pressure transducers and can lay against one another for (parasitic) power transmission.
  • the essentially circular pressure transducer has the advantage that, on the one hand, a relatively inexpensive pressure transducer element, which is manufactured on a large industrial scale, is available inexpensively. Because the tread areas are covered in a mosaic-like manner, there is sufficient flexibility in the tread area to also enable an orthopedically necessary unrolling when walking in the sole or heel area.
  • the sole or heel containing the transducers is therefore a component with a sandwich-like structure in which a flexible wear layer, the transducers and the basic structure of the shoe 1, which absorbs the forces of occurrence, adjoin one another in the form of a corresponding molded body.
  • the measurement recorders 4 are arranged as directly as possible adjacent to the foot, that is to say they are located on the top of the sole or heel region of the shoe 1.
  • the output signals of the transducers 4 are each supplied separately for the sole region 2 and the heel region 3 summing circuits 14 and 15, which add up the output signals of the signal converters, so that the analog value of the output signal is proportional to the total force impinging on the sole or heel area as an integral of the local pressure values - regardless of the part of the area in which the relevant force is exerted.
  • the output signals of stages 14 and 15 are fed to analog-digital converters 16 and 17, the digitized signals in turn reaching maximum value memories 18 and 19 which hold the largest signal value that occurred in a corresponding memory location.
  • the internal logic of this circuit therefore contains comparing means which determine whether the digital value present at the input is greater than the stored value. If this condition applies, the stored value is replaced by the one at the input.
  • the maximum value memories 18 and 19 are each reset via “reset” inputs, which are addressed after each load cycle (occurrence).
  • the output signals of the maximum value memories 18 and 19 reach a comparator 20, which emits an output signal ("high") if the digital value predominates in the memory 18.
  • the comparator 20 controls a switching stage 21 which, depending on the output signal of the Comparator 20 allows either the digital output signal of the maximum value memory 18 or that of the corresponding memory 19 to reach the output of the switch 21.
  • the output signal of the switch 21 is fed to an addresser 22 as an input signal, this signal being input by the addresser an address signal of a memory 23 is converted, which consists of a series of counters, each of which is incremented by "1" by a clock signal assigned to the counter in question.
  • a control signal is supplied as a clock signal.
  • the clock signal for the incrementing of the addressed counter in the memory 23 is generated by two threshold value stages 24 and 25, the output signals of which are fed to an AND gate 26. If the digital output signal of the analog-digital converter 16 or 17 falls below a predetermined value, which corresponds to a complete relief of the pressure transducers, then the threshold value stages 24 and 25 give this signal state transmitting logic signal, wherein when both areas (sole and heel) are relieved, a signal is emitted by the AND gate 26, which forms the corresponding clock signal for the memory 23.
  • the memory 23 represents a histogram memory, the counter readings of these individual counters reflect the frequency of the occurrence of predetermined pressure values (occurrence forces).
  • the maximum value memories 18 and 19 are reset at the same time with each relief, so that they are ready for a new measurement of the occurrence force.
  • the output signal of the comparator 20 is optionally supplied to the addresser 22 as an additional address signal. It contains information about whether the maximum value comes from the heel or the sole area. If the counter areas of the memory 23 are divided into two groups, each pressure value can be classified absolutely (ie regardless of whether it occurred in the heel or in the sole area). In the other group of counters, the registration only takes place in association with the location that reached the maximum value, for example here in the area of the floor. From the number of values registered for a digital value range of occurrence forces in the corresponding counters of the two counter groups, an assignment can be made when reading out later, in which range the respective load numbers occurred, so that a more detailed analysis of the occurrence behavior of the patient is possible. Any number of pressure transducers can be logically assigned to individual meter areas become. For this purpose, a corresponding summer 14 or 15 with the downstream maximum value memory would have to be provided for a group of such pressure transducers.
  • the display unit 10 is connected to the output of the counter.
  • the key 11 gives a clock signal for a counter 24 which, when the read-out part (display 10) is inserted, emits an address signal which replaces the output signals of the stages 21 and 20.
  • all counter readings can be queried cyclically, so that the doctor is given the option of querying the desired " information after a predetermined period of use
  • the boundaries between the individual counting ranges in the histogram can be provided in increments of 25 N each.
  • FIGS. 4 and 5 illustrate a further exemplary embodiment of the measuring tube according to the invention as a representation in top view and in cross section.
  • a single pressure receiver is provided for the entire tread area.
  • This is designed as a plate capacitor 27 with a pressure-dependent plate spacing.
  • the cross-sectional illustration in FIG. 5 shows that the capacitor consists of three plates 28, 29 and 30, which are separated from one another by two foam rubber layers 31 and 32 which act as a dielectric.
  • the plate 28 forming a pole of the capacitor is located in the middle of the measuring base, while the two outer plates 29 and 30 form the opposite pole.
  • the capacitance is thus determined between the middle 28 and the two outer plates 29 and 30.
  • the plates 28, 29 and 30 consist of plastic films coated with conductive material. These are preferably foils coated with gold or silver, as are also used for the production of foil capacitors.
  • the electrically positive film 28 has cutouts 33 and 34 in the areas of the heel and ball of the foot, as a result of which the areas of extreme surface pressure which would falsify the measurement result due to the nonlinearity of the pressure dependence of the capacity are eliminated.
  • a larger recessed area which is smaller in itself than the tread zone (ie the entire contact area of the foot with the sole) when touching down in the heel or ball area
  • several smaller cutouts can also be provided, which then also can exceed this area.
  • the dimensioning of these areas is to be carried out in such a way that the change in capacity achieved becomes essentially independent of the area over which the treading force is distributed.
  • the electrical components for converting the change in capacitance into a change in frequency are soldered as SMD component 35 on a copper foil board and in the area the heel cut-out 33, that is to say arranged outside the measuring range relevant for the detection. Accordingly, it can also be provided in the area of the toes.
  • the SMD component 35 is part of the sole designed as a disposable part.
  • the SMD component 35 is connected to a hand-held device 36 via a plug connection 8 on the heel of the measuring shoe and a cable 9, which also accommodates further electrical components for signal evaluation.
  • FIG. 6 shows the essential modules for signal evaluation in a block diagram.
  • the frequency change signal generated by the SMD module 35 is first converted 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 output signal from circuit 37 which forms a measure of the force of occurrence, is fed to a threshold circuit 38 and this signal is also integrated via a timing element 39, so that a pulse of the order of 0.1 to 1 s results.
  • An oscillator 40 is activated for this period, which modulates the signal pulse as a sound signal and drives a loudspeaker 41.
  • the loudspeaker 41 causes a beep with a duration that is determined by the timing element 39 when a limit load that can be set with the aid of the threshold value circuit is exceeded.
  • a further corresponding threshold circuit can also be used in another embodiment of the invention to provide an (additional) upper threshold, from which signal output is prevented. In this case, only an impact force in the intended target range leads to an acoustic signal.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

Un dispositif de mesure des forces exercées pendant la marche comprend un capteur de pression agencé dans la partie d'une chaussure sur laquelle on pose le pied pendant la marche, ou une pluralité de capteurs de pression répartis sur la surface de la chaussure sur laquelle on pose le pied pendant la marche. Les capteurs de pression font office de convertisseurs de signaux qui convertissent les valeurs de la pression mécanique en signaux électriques. Le signal de sortie du capteur de pression, ou l'ensemble des signaux de sortie de plusieurs capteurs de pression, constituent une mesure de l'intégrale des forces de compression exercées sur la zone sur laquelle on pose le pied pendant la marche.
EP19890907095 1988-07-01 1989-07-03 Dispositif de mesure des forces exercees pendant la marche Withdrawn EP0377714A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3822767 1988-07-01
DE3822767 1988-07-01
DE19883827999 DE3827999A1 (de) 1988-07-01 1988-08-15 Messvorrichtung fuer auftrittskraefte
DE3827999 1988-08-15

Publications (1)

Publication Number Publication Date
EP0377714A1 true EP0377714A1 (fr) 1990-07-18

Family

ID=25869776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890907095 Withdrawn EP0377714A1 (fr) 1988-07-01 1989-07-03 Dispositif de mesure des forces exercees pendant la marche

Country Status (3)

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

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4135940A1 (de) * 1991-10-31 1993-05-06 Anselm Dipl.-Ing. Futterer (Fh), 7483 Inzigkofen, De Fussauftrittskraft mess - und warngeraet
ES2070692B1 (es) * 1992-11-17 1997-02-16 Univ Politecnica De Valencia I Plantillas instrumentadas para medida de presiones.
DE4316992A1 (de) * 1993-05-21 1994-04-21 Daimler Benz Ag Meßanordnung zur Belastungsmessung an den unteren Gliedmaßen einer anthropomorphen Meßpuppe oder dergleichen
US5344408A (en) * 1993-08-06 1994-09-06 Becton, Dickinson And Company Break-away safety shield for needle cannula
DE4337608A1 (de) * 1993-11-04 1995-06-22 Paromed Medizintechnik Gmbh Vorrichtung und Verfahren zur Ulcusprophylaxe und zur Früherkennung der Neuropathie beim diabetischen Fuß
WO1995014430A1 (fr) * 1993-11-22 1995-06-01 Della Ca Pietro Procede de determination du poids du corps humain et dispositif permettant d'appliquer ce procede
DE9406117U1 (de) * 1994-04-13 1994-09-08 DEKUMED Gesellschaft für Kunststoff- und Medizintechnik mbH, 83233 Bernau Schuheinlage mit Belastungsüberwachung
DE4442930A1 (de) * 1994-12-02 1996-06-05 Wolfgang Singewald Orthopädisches Gerät
DE19612334A1 (de) * 1995-04-04 1997-01-02 Thomas Dipl Ing Thomann Tragbares Fußbelastungs-Warngerät
DE19521080A1 (de) * 1995-06-09 1996-12-12 Mex & Wonisch Gmbh & Co Kg Überwachungseinrichtung
DE29604379U1 (de) * 1996-03-09 1997-07-17 Taut, Werner, 44339 Dortmund Gerät zur Überwachung der Belastung des menschlichen Beins im Anschluß an eine Osteosynthese
DE19751878A1 (de) * 1997-11-22 1999-05-27 Sonja Lange Vorrichtung zum Anzeigen der Belastung eines Fußes und/oder Beines beim Auftreten
DE19804443A1 (de) * 1998-02-05 1999-08-19 Rausch Einrichtung zum Erfassen der Belastung eines Beines eines Patienten
EP1419734A1 (fr) * 2002-11-13 2004-05-19 Fritz Minke GmbH & Co. KG Dispositif permettant de surveiller la charge s'appliquant au système locomoteur
DE102014104698B4 (de) 2014-04-02 2015-12-10 Ryszard Bukszynski Vorrichtung zur Messung der Auftrittskraft eines Fußes beim Gehen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3714218A1 (de) * 1987-04-29 1988-12-01 Huberti Helmut Dr Med Therapeutische schutzvorrichtung gegen ueberlastung des menschlichen bewegungsapparates, sogenannte fusssohlenwaage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9000031A1 *

Also Published As

Publication number Publication date
WO1990000031A1 (fr) 1990-01-11
DE3827999A1 (de) 1990-01-11

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