EP4115868B1 - Dispositif de surveillance de la charge sur une jambe d'un patient - Google Patents

Dispositif de surveillance de la charge sur une jambe d'un patient Download PDF

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Publication number
EP4115868B1
EP4115868B1 EP21184472.5A EP21184472A EP4115868B1 EP 4115868 B1 EP4115868 B1 EP 4115868B1 EP 21184472 A EP21184472 A EP 21184472A EP 4115868 B1 EP4115868 B1 EP 4115868B1
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EP
European Patent Office
Prior art keywords
compression spring
force introduction
introduction element
crutch
load
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EP21184472.5A
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German (de)
English (en)
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EP4115868A1 (fr
Inventor
Klaus Wurster
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Klaus Wurster GmbH
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Klaus Wurster GmbH
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H3/00—Appliances for aiding patients or disabled persons to walk about
    • A61H3/02—Crutches
    • A61H3/0277—Shock absorbers therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H3/00—Appliances for aiding patients or disabled persons to walk about
    • A61H3/02—Crutches
    • A61H3/0288—Ferrules or tips therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/01—Constructive details
    • A61H2201/0173—Means for preventing injuries
    • A61H2201/0184—Means for preventing injuries by raising an alarm
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5007—Control means thereof computer controlled
    • A61H2201/501—Control means thereof computer controlled connected to external computer devices or networks
    • A61H2201/5012—Control means thereof computer controlled connected to external computer devices or networks using the internet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5023—Interfaces to the user
    • A61H2201/5043—Displays
    • A61H2201/5046—Touch screens
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5058—Sensors or detectors
    • A61H2201/5061—Force sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5058—Sensors or detectors
    • A61H2201/5064—Position sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5058—Sensors or detectors
    • A61H2201/5071—Pressure sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5058—Sensors or detectors
    • A61H2201/5082—Temperature sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5097—Control means thereof wireless
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2230/00—Measuring physical parameters of the user
    • A61H2230/80—Weight

Definitions

  • the invention relates to a device for monitoring the load on a patient's leg or foot when using a crutch.
  • a sole plate for absorbing a force exerted by a patient's foot and a spring device mechanically connected to the sole plate are known, the spring device being elastically deformable by pressure on the upper sole plate.
  • a signal generating device is provided for generating a warning signal when a predetermined deformation of the spring device is reached.
  • the known devices either cannot reliably determine the load effectively acting on a patient's leg when using a crutch or are complex in construction and correspondingly expensive.
  • the assembly of the known devices, especially in crutches, is also complex.
  • a cane support for controlling the leg load during the rehabilitation of patients, which signals to the user that a preselectable force on the cane support has been exceeded.
  • a tube that is closed at the bottom In a lower end of a length-adjustable tube there is a tube that is closed at the bottom and has a rubber buffer that can be moved longitudinally.
  • a possible displacement path of the tube, which is closed at the bottom, is limited by a rivet that slides in elongated holes and is firmly connected to the length-adjustable tube.
  • a helical compression spring is arranged between a pressure piece connected to the rivet and the lower end of the tube closed at the bottom, which causes the tube closed at the bottom to push into the length-adjustable tube when the stick support is subjected to longitudinal loading.
  • the invention is based on the object of providing a device of the type mentioned at the outset, which makes it possible to reliably determine the load acting on a patient's leg when using crutches in a structurally simple and cost-effective manner.
  • the device should preferably be able to be mounted on existing crutches in a simple manner, if possible, by the patient himself.
  • the invention solves the problem in that the device is connectable to a foot area of the crutch first compression spring and a first capacitive or inductive measuring device, wherein the first capacitive or inductive measuring device measures a compression of the first compression spring when the crutch is loaded.
  • the crutch or crutches affected according to the invention can in particular be single-arm crutches, also colloquially referred to as crutch(s).
  • a first compression spring that can be connected to a foot area of the crutch is provided to measure the load acting on the crutch when it is placed on the ground.
  • the first compression spring is designed for high loads so that it does not impact when the patient is supported, i.e. does not block.
  • the first compression spring is compressed.
  • a first capacitive or inductive measuring device is provided to measure the compression.
  • the capacitive or inductive sensor measures the path of the first compression spring under load, i.e. the compression.
  • the load acting on the first compression spring can be calculated from the measurement result. This in turn, together with the known body weight of the patient, provides reliable information about the load on the leg or foot of the patient's leg standing on the ground.
  • the device according to the invention can in particular replace a foot insert in a pipe section of the crutch. This ensures that standard crutches can be easily retrofitted. Assembly can be easily done by the patient himself. This results not least from a simple construction and measurement technology structure.
  • the device is correspondingly inexpensive, robust and space-saving. The proven, simple design of the crutches does not need to be changed. Rather, only a part of the crutches that is already separately provided, namely the foot insert, is replaced by the device according to the invention.
  • the first compression spring can be a cylindrical torsion spring.
  • a helical spring allows large forces to be measured in a very small space.
  • Such helical springs are subjected to torsion under load and, due to their geometry, are ideally suited for the present application for mounting on a tube section of a crutch.
  • the first compression spring is designed for comparatively large loads above which it stops or blocks.
  • the first compression spring can thus be designed for loads of up to 50 kg, preferably up to 75 kg, more preferably up to 100 kg. This ensures that the load that occurs when supporting the patient is always within the measuring range and can therefore be reliably recorded.
  • a first force introduction element can be provided that can be placed on a tube section of the crutch that forms the foot area and is attached to the first compression spring.
  • the first force introduction element can be hollow cylindrical and can be arranged at least in sections within the first compression spring when attached to the first compression spring.
  • the first force introduction element serves as an active mechanical connection between the pipe section and the first compression spring.
  • the first force introduction element can be screwed, for example, to the first compression spring.
  • the tubular section of the crutch can be held in the first force introduction element as a press fit, for example by sealing rings, in particular O-rings.
  • the first force introduction element can have a stop against which the free end of the pipe section, i.e.
  • the pipe section is thus held securely in the first force introduction element.
  • the first force introduction element can be a hollow cylindrical body with a Thread formed in sections on its circumferential surface for screwing to the first compression spring, which can have a corresponding internal thread.
  • the first force introduction element can have a closed bottom.
  • the tubular section of the crutch dips into the force introduction element.
  • the flow of force is thereby redirected twice and concentrated on the narrowest part of the pipe section. In this way, no overall height of the crutch is wasted.
  • the device according to the invention essentially does not increase the length of the crutch. Retrofitting a conventional crutch with the device according to the invention is particularly simple thanks to this design and can be easily carried out by the patient himself.
  • the first force introduction element can form a movable electrode of the first capacitive measuring device.
  • a fixed electrode of the first capacitive measuring device can then be arranged on an end of the first compression spring facing away from an insertion opening of the first compression spring for the first force introduction element.
  • This insertion opening is in particular facing away from the foot of the crutch, and the fixed electrode can be arranged, in particular attached, for example glued, to an end of the first compression spring facing the foot of the crutch.
  • the movable electrode of the first capacitive measuring device can be formed, for example, by a section of the first force introduction element facing the foot of the crutch, in particular by a bottom of the hollow cylindrical first force introduction element. In this way, the interaction of the movable electrode and Capacitive displacement measurement can be carried out in a particularly simple manner using the fixed electrode as a capacitor. An overload stop is integrated into the design.
  • a second compression spring which can be connected to the tube section forming the foot area of the crutch and is designed for a lower load than the first compression spring.
  • a second capacitive or inductive measuring device is provided, wherein the second capacitive or inductive measuring device measures a compression of the second compression spring when the crutch is loaded.
  • the second spring can in turn be a cylindrical torsion spring.
  • the second compression spring can be designed for loads up to a stop, in particular a blocking, of a maximum of 20 kg, preferably a maximum of 10 kg.
  • the effective relief provided by the crutches and thus the effective load on the patient's leg is determined by the vertical components of the reaction forces of the crutches.
  • the first compression spring is used to measure the load on the crutch and thus the reaction force along the longitudinal axis of the crutch, in particular the pipe section.
  • To measure the vertical component of the reaction force it is also necessary to measure the angle of the longitudinal axis of the crutch, in particular the tube section of the crutch, to the vertical. In the present case, this is achieved by a second compression spring which is weak compared to the first compression spring and which strikes, i.e. blocks, at a relatively low load and then tips over.
  • the second compression spring automatically adapts to the geometric binding of the crutch, which is formed by placing the crutch on the floor.
  • the weaker second compression spring thus acts as an elastic joint.
  • the variable angle of the longitudinal axis of the crutch to the vertical can also be detected capacitively or inductively, as will be explained in more detail below.
  • Another advantage of the combination of a weak second compression spring and a strong first compression spring is the avoidance of hard shocks when placing the crutches on the floor due to the gradual build-up of force by the two compression springs.
  • the second compression spring is preferably arranged closer to the foot of the crutch than the first compression spring. An automatic angle adjustment takes place, which saves the usual approach to tactile resistance from the surface with conventional crutches. This achieves greater stability and improved walking comfort for the patient.
  • the first compression spring and the second compression spring can be designed as a one-piece cylindrical torsion spring, with a first longitudinal section of the one-piece cylindrical torsion spring forming the first compression spring and a second longitudinal section of the one-piece cylindrical torsion spring forming the second compression spring.
  • the second longitudinal section can be arranged closer to the foot of the crutch than the first longitudinal section.
  • the strong and weak compression springs are combined in a one-piece component, a monoblock. Overall, it can be a hollow cylindrical compression spring component, with the turns of the compression spring differing from those in the second longitudinal section, particularly in terms of number, pitch and/or dimension.
  • a non-resilient section can be provided between the two longitudinal sections, which can hold fixed electrodes of the first capacitive measuring device and/or the second capacitive measuring device.
  • fixed electrodes of the first and/or second capacitive measuring device can be glued into the fixed section from opposite sides with corresponding circuit boards.
  • a second force introduction element attached to the second compression spring can be provided.
  • the second force introduction element can at the same time form a foot of the crutch that can be placed on a surface.
  • the second force introduction element or, depending on the consideration of the force flow, the force dissipation element can for example again have a cylindrical, for example wooden cylindrical, basic shape with a thread formed on a section of the circumference, with which the second force introduction element can be screwed to a corresponding internal thread of the second compression spring .
  • the second force introduction element can have a damping foot section, for example made of rubber, which, in addition to damping, also provides the required static friction.
  • the second force introduction element When attached to the second compression spring, the second force introduction element can be arranged in sections within the second compression spring. It is then immersed in the second compression spring or the monoblock made up of the first and second compression springs, so that the overall height is not increased unnecessarily here either.
  • the second force introduction element can form a movable electrode of the second capacitive measuring device, and a fixed electrode of the second capacitive measuring device can be arranged on an end of the second compression spring facing away from an insertion opening of the second compression spring for the second force introduction element.
  • the end of the second force introduction element inserted into the second compression spring for example a bottom of the second force introduction element, can form the movable electrode of the capacitor of the second capacitive measuring device.
  • a fixed electrode of the capacitor can then be arranged at an end of the second compression spring opposite the insertion opening. As explained above, this can be done, for example, in a fixed section of the monoblock between the two longitudinal sections forming the first and second compression springs. If the second compression spring is compressed or tilted under load, the distance between the movable electrode of the second force introduction element and the fixed electrode is reduced accordingly, so that the path traveled by the second compression spring under load can in turn be capacitively detected.
  • a first measuring coil of the inductive measuring device can be arranged, for example, in particular at the top in the fixed section of the monoblock.
  • a compression of the first compression spring can then be detected by a change in the magnetic resistance of the air gap between the upper side of the monoblock and the lower side of the first force introduction element.
  • the second measuring device is an inductive measuring device.
  • the second measuring coil can be arranged in particular at the bottom in the fixed part of the monoblock.
  • the angle created by tilting the second compression spring can then be changed by changing the magnetic Resistance of the air gap between the lower side of the monoblock and the upper side of the second force introduction element can be detected.
  • the device can include an evaluation device which calculates a load on the patient's leg standing on the ground from the measured compression of the first compression spring and/or the second compression spring and outputs an overload signal when a limit load is exceeded.
  • the overload signal can be output, for example, in the form of a visual, acoustic and/or haptic alarm, so that the patient immediately recognizes the overload and can reduce it by adjusting the placement angle of the crutches or shifting his body weight.
  • the evaluation device can in principle also be integrated into the crutches. However, it could also be located at a location separate from the crutches, so that the crutches only include a (wireless) transmitter for transmitting the measurement results to the evaluation device.
  • the evaluation device could then be arranged, for example, in a portable mobile device, for example a smartphone, a smartwatch or data glasses.
  • Modern microcontrollers with low energy consumption can be used in the capacitive measuring devices of the device according to the invention, which can communicate with Internet terminals, for example via Bluetooth.
  • Internet terminals can typically be formed by smartphones, smartwatches or data glasses. Monitoring the patient's stress during rehabilitation can therefore be easily implemented via the evaluation device, for example an app. The measured values can then be transferred to the evaluation device via a suitable interface.
  • the evaluation device can be designed as an app.
  • the patient can enter personal data in an initialization phase, for example his body mass in kilograms, which he measures with a bathroom scale.
  • the evaluation device or app can determine the geographical latitude and altitude via GPS via an internet connection. Taking into account the local gravitational acceleration of the earth according to Cassini's approximation, the evaluation device or app can then calculate the patient's exact body weight.
  • a limit load set for example by a doctor, can be entered into the evaluation device or app, for example in the unit Newton.
  • the evaluation device or app receives the measured values of the two crutches on the Internet terminal, in particular wirelessly, and continuously calculates the vertical components of the reaction forces of the crutches. From these, the effective load on the patient's leg can be calculated, taking into account the previously determined body weight. All measured values and the control of the limit load can be documented in the evaluation device or app for later evaluation.
  • the first compression spring and/or the second compression spring in particular a monoblock forming the first and second compression springs and/or the first force introduction element and/or the second force introduction element (possibly except for a foot, which can be made of rubber, for example), can/can be made of a metal, for example stainless steel or an aluminum material.
  • the invention also relates to a crutch, in particular a one-arm crutch, with a device according to the invention mounted thereon.
  • FIG. 1 A patient is shown schematically, supporting himself on the floor with two one-arm crutches. Due to the patient's body weight G, the crutches exert pressure on the floor, with the reaction forces F 1 and F 2 relieving the patient's body on the resting foot.
  • Figure 2 shows the effective forces with their points of attack on the ground in a top view.
  • FIG 4 is a device according to the invention for monitoring the load on the patient's leg or foot when using a crutch in one shown in a perspective exploded view.
  • the device comprises a first hollow cylindrical force introduction element 12 into which the tube section 10 is inserted.
  • the pipe section 10 is held by a press fit within the first force introduction element 12.
  • the left-hand bottom of the hollow cylindrical first force introduction element 12 forms a stop for the pipe section 10.
  • a monoblock 16 which is also hollow cylindrical, forms a first compression spring and a second compression spring, as will be explained in more detail below.
  • a fixed electrode 18 of a first capacitive measuring device is arranged from one side and a fixed electrode 20 of a second capacitive measuring device is arranged from the opposite side.
  • the first force introduction element 12 forms with its in Figure 4 left closed end a movable electrode of the first capacitive measuring device, as will also be explained in more detail below.
  • the first force introduction element 12 has an external thread 22 on a section of its circumferential surface (see Figures 7 and 8 ), with which the first force introduction element 12 is screwed to an internal thread 24 of the monoblock 16 when it is partially inserted into the monoblock 16.
  • the device also has a second force introduction element 26, which in the example shown is also hollow cylindrical and which also has an external thread 28 on a section of its circumference, which is inserted into a corresponding internal thread on the inside Figure 4 left end of the monoblock 16 is screwed in.
  • a second force introduction element 26 which in the example shown is also hollow cylindrical and which also has an external thread 28 on a section of its circumference, which is inserted into a corresponding internal thread on the inside Figure 4 left end of the monoblock 16 is screwed in.
  • the end face of the second force introduction element 26 that can be seen forms a movable electrode 30 of the second capacitive measuring device.
  • a rubber foot 32 is applied, for example vulcanized, to the lower end of the second force introduction element 26.
  • the monoblock 16 forming the first and second compression springs will be explained in more detail.
  • the monoblock 16 is overall a hollow cylindrical torsion spring, with a first longitudinal section 34 forming a first compression spring 36 and a second longitudinal section 38 forming a second compression spring 40. Between the longitudinal sections 34, 38 and thus between the first compression spring 36 and the second compression spring 40, a fixed section 42 is provided, into which the fixed electrodes 18 and 20 are glued from opposite sides.
  • the first compression spring 36 is designed to be stronger than the second compression spring 40.
  • the first compression spring 36 can be designed for loads of up to 50 kg, preferably up to 75 kg, more preferably up to 100 kg.
  • the second compression spring 40 can be designed for loads of a maximum of 30 kg, preferably a maximum of 20 kg, more preferably a maximum of 10 kg. This can be achieved by the number and design, in particular dimension and pitch, of the turns of the two compression springs 36, 40.
  • the monoblock 16 can consist of a metal, for example stainless steel or an aluminum material.
  • the first force introduction element 12 will be explained in more detail. As already explained, the first force introduction element 12 is connected to the one in the Figures 7 and 8 lower end inserted into the interior of the first compression spring 36 and screwed. A flange section 44 forms a stop. In Figure 8 the end face section forming the movable electrode 46 of the first capacitive measuring device can be seen. The movable electrode 46, together with the fixed electrode 18, forms a capacitor of the first capacitive measuring device.
  • the first force introduction element 12 can also consist of a metal, for example stainless steel or an aluminum material. In Figure 8 There is also a ring-shaped heel at the bottom of the first Force introduction element 12 can be seen, which forms an overload stop 52 integrated into the construction.
  • the second force introduction element 26 can be seen.
  • the one in the Figures 9 and 10 upper end face the movable electrode 30 of the second capacitive measuring device, which forms a capacitor together with the fixed electrode 20.
  • a flange section 48 is provided, which forms a stop when the second force introduction element 26 is screwed into the second compression spring 40.
  • the second force introduction element 26 can also consist of a metal, for example stainless steel or an aluminum material, except for the rubber foot.
  • the second compression spring 40 is initially compressed until it blocks relatively quickly and then bends in the form of an elastomechanical joint. This results in a reduction in the distance between the movable electrode 30 and the fixed electrode 20 of the second capacitive measuring device. As the crutch is put on further, the stronger first compression spring 36 is compressed and thus the distance between the movable electrode 46 and the fixed electrode 18 of the first capacitive measuring device is reduced. The first and second capacitive measuring devices accordingly measure the path of the first compression spring 36 and the second compression spring 40 under load.
  • the measured values can, for example, be transmitted wirelessly, preferably via a Bluetooth connection, to an evaluation device 50 of the device according to the invention.
  • the evaluation device 50 can be used, for example, by an app on an internet terminal, for example a smartphone, a smartwatch or data glasses.
  • the evaluation device 50 calculates the load B on the patient's leg from the measured values.
  • the patient's body weight is taken into account, which is preferably calculated precisely using GPS data for the respective location.
  • the patient can have previously entered his body mass in kilograms into the evaluation device 50.
  • the evaluation device 50 can be given a limit load that should not be exceeded. This can be specified by a doctor, for example.
  • the evaluation device 50 If the evaluation device 50 detects that the limit load has been exceeded by the determined load B , it can output an overload signal, for example an optical, acoustic and/or haptic alarm signal.
  • an overload signal for example an optical, acoustic and/or haptic alarm signal.
  • the continuously determined load values B can be stored in the evaluation device 50 for later evaluation.
  • the distance z 2 between the electrodes 30, 20 of the second capacitive measuring device changes.
  • the distance depends on the coordinate x along the respective electrode surface, since the second compression spring 40 bends as explained above.
  • the following applies to the distance z 2 (x): e.g 2 x d + sin ⁇ ⁇ r Outside + tan ⁇ ⁇ x
  • the temperature can be measured in the device according to the invention, in particular by providing a temperature sensor.
  • capacitive first and second measuring devices were described in the exemplary embodiment with reference to the figures, inductive measuring devices would also be possible.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Pain & Pain Management (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Rehabilitation Therapy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Rehabilitation Tools (AREA)

Claims (14)

  1. Dispositif de surveillance de la charge sur une jambe d'un patient pendant l'utilisation d'une béquille, dans lequel le dispositif comporte un premier ressort de pression (36) apte à être relié à une région de pied de la béquille et un premier système de mesure capacitif ou inductif, dans lequel le premier système de mesure capacitif ou inductif mesure une compression du premier ressort de pression (36) lors d'une charge sur la béquille, dans lequel il est également prévu un deuxième ressort de pression (40) apte à être relié à la section de tube (10) formant la région de pied de la béquille, caractérisé en ce que le deuxième ressort de pression (40) est conçu pour une charge plus petite que le premier ressort de pression (36), et en ce qu'il est prévu un deuxième système de mesure capacitif ou inductif, dans lequel le deuxième système de mesure capacitif ou inductif mesure une compression du deuxième ressort de pression (40) lors d'une charge sur la béquille.
  2. Dispositif selon la revendication 1, caractérisé en ce que le premier ressort de pression (36) est un ressort de torsion cylindrique (36).
  3. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le premier ressort de pression (36) est conçu pour des charges jusqu'à 50 kg, de préférence jusqu'à 75 kg, plus préférentiellement jusqu'à 100 kg.
  4. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un premier élément d'induction de force (12) apte à être placé sur une section de tube (10) de la béquille formant la région de pied, lequel est fixé au premier ressort de pression (36).
  5. Dispositif selon la revendication 4, caractérisé en ce que le premier élément d'induction de force (12) est formé comme un cylindre creux et disposé au moins partiellement à l'intérieur du premier ressort de pression (36) dans l'état fixé au premier ressort de pression (36).
  6. Dispositif selon la revendication 5, caractérisé en ce que le premier élément d'induction de force forme une électrode mobile (46) du premier système de mesure capacitif, et en ce qu'une électrode fixe (18) du premier système de mesure capacitif est disposée à une extrémité du premier ressort de pression (36) opposée à une ouverture d'introduction du premier ressort de pression (36) destinée au premier élément d'induction de force (12).
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le deuxième ressort de pression (40) est un ressort de torsion cylindrique (40).
  8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le deuxième ressort de pression (40) est conçu pour des charges de 20 kg maximum, de préférence de 10 kg maximum.
  9. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le premier ressort de pression (36) et le deuxième ressort de pression (40) sont formés comme un ressort de torsion cylindrique unitaire (16), dans lequel une première section longitudinale (34) du ressort de torsion cylindrique unitaire (16) forme le premier ressort de pression (36) et une deuxième section longitudinale (38) du ressort de torsion cylindrique unitaire (16) forme le deuxième ressort de pression (40).
  10. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un deuxième élément d'induction de force (26) fixé au deuxième ressort de pression (40).
  11. Dispositif selon la revendication 10, caractérisé en ce que le deuxième élément d'induction de force (26) forme simultanément un pied de la béquille susceptible d'être placé sur un sol.
  12. Dispositif selon l'une des revendications 10 ou 11, caractérisé en ce que le deuxième élément d'induction de force (26) est disposé au moins partiellement à l'intérieur du deuxième ressort de pression (40) dans l'état fixé au deuxième ressort de pression (40).
  13. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le deuxième élément d'induction de force (26) forme une électrode mobile (30) du deuxième système de mesure capacitif, et en ce qu'une électrode fixe (20) du deuxième système de mesure capacitif est disposée à une extrémité du deuxième ressort de pression (40) opposée à une ouverture d'introduction du deuxième ressort de pression (40) destinée au deuxième élément d'induction de force (26).
  14. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un système d'évaluation (50), lequel calcule une charge sur la jambe du patient à partir de la compression mesurée du premier ressort de pression (36) et/ou du deuxième ressort de pression (40) et émet un signal de surcharge lors d'un dépassement d'une charge limite.
EP21184472.5A 2021-07-08 2021-07-08 Dispositif de surveillance de la charge sur une jambe d'un patient Active EP4115868B1 (fr)

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Publication number Priority date Publication date Assignee Title
DE2704520A1 (de) * 1977-02-01 1978-08-03 Georg Dipl Ing Bergmann Stockstuetze mit eingebauter kraftmess- und signaleinrichtung
DE10214745A1 (de) * 2001-04-03 2003-02-20 Horst Broziat Belastungsmelder
AT412254B (de) 2002-06-19 2004-12-27 Heimo Dr Clar Vorrichtung zur messung und überwachung der teilbelastung orthopädischer und unfallchirurgischer patienten
DE102009057424B4 (de) 2009-12-08 2012-09-06 Panasonic Corporation Gehhilfe mit kabellosem piezoelektrischem Kraftmessmodul
DE102013001192A1 (de) 2013-01-24 2014-07-24 Harald Kobolla Informationssystem und Verfahren zur Information eines Patienten über seine Auftrittsbelastung
DE202015102702U1 (de) 2015-05-26 2015-06-23 Edgar Emil Sinn Vorrichtung zum Erzeugen eines Warnsignals bei zu hoher Belastung eines Beins eines Patienten
DE102015108261A1 (de) 2015-05-26 2016-12-15 Edgar Emil Sinn Vorrichtung zum Erzeugen eines Warnsignals bei zu hoher Belastung eines Beins eines Patienten
CN206994700U (zh) * 2017-05-10 2018-02-13 倪浩城 一种跌倒报警拐杖

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