WO2018215383A1

WO2018215383A1 - Gait training device

Info

Publication number: WO2018215383A1
Application number: PCT/EP2018/063248
Authority: WO
Inventors: David SALICIO CASTILLO; Ophélie CHOUPIN; Stélian CAMARA DIT PINTO; Maëva LE CLECH
Original assignee: Assistance Publique Hopitaux De Paris
Priority date: 2017-05-22
Filing date: 2018-05-21
Publication date: 2018-11-29
Also published as: FR3066397A1; US20200222750A1; EP3634589A1

Abstract

The invention relates to a gait training device (100) comprising a treadmill (120) comprising a belt (121) and rolling parts (122-124), and a frame (130) on which the treadmill is mounted, the rolling parts comprising: - a plurality of balls (122-124) distributed around a central core (126), and - a cage (125) enclosing the plurality of balls in order to keep said balls on the central core while allowing them to be movable relative to said central core, the belt (121) being able to slide over the balls and rotate said balls on the central core.

Description

DEVICE FOR TRAINING ON THE MARKET

TECHNICAL AREA

The present invention relates to a training device for walking, in particular for the rehabilitation of patients with injuries or disorders of walking or for training sportsmen. The invention has applications in the medical field, for example for rehabilitation in trauma, rheumatology and neurology, or in the sports field for training in walking or running or in the field of simulators and games video to simulate the movement of a user.

STATE OF THE ART

Walking mats are known, both in the medical field and in sports, to train a patient, an athlete or any other user to walk or run. These treadmills allow a repetition of the number of steps at different speeds or even slopes.

Many medical studies have demonstrated the value of these treadmills for the rehabilitation of patients with wounds or rheumatological or neurological conditions or in elderly patients for walking training. Indeed, it has been shown that the use of a treadmill improves the walking performance of these patients compared to conventional rehabilitation practiced only with the help of a therapist.

In the sports field, whether for the training of a high-level athlete or for occasional physical activity, the treadmill is used to reproduce, indoors, walking or running usually in the open air, with substantially identical effects on the body.

A conventional treadmill, such as that shown in Figure 1 and referenced 10, generally comprises a frame 1 1 in which a tread 12 is moved. This tread 12 is an endless band, that is to say forming a closed loop, of flexible material driven and supported by pulleys or drums 13. The pulleys and / or drums 13 are mounted transversely in the frame 1 1, inside the tread so that said tread is in tension between the two pulleys and / or drums 13. The pulleys and / or drums 13 are rotated by a motor not shown in FIG. 1 but generally accommodated in the chassis, so as to scroll the tread.

A conventional treadmill 10 generally comprises a console 15 provided with a control keyboard for controlling, for example, starting, stopping, speed and sometimes inclination of the tread 12 and a screen for visualize speed and slope data and / or medical data.

In addition, a conventional tread generally comprises holding arms 14, fixed to the frame and positioned substantially vertically of the tread 12. These holding arms 14 may be gripping handles that allow the user to synchronize its movements with the running of the tread, especially when the treadmill is used for sports applications. The holding arms 14 may also be parallel bars, as shown in Figure 1, which allow a brachial support of the user during the movement of his legs, especially when the treadmill is used for medical purposes.

Conventional treadmills have a disadvantage in terms of adaptability. Indeed, even if the conditions of running of the tread (speed of movement and inclination) can vary, these conditions respond to predefined parameters determined independently of the user. The user, or his therapist, can choose the tread conditions from among a selection of predetermined conditions, but this selection of conditions is invariable regardless of the user of the treadmill. The user must therefore adapt to the running rate of the tread. However, some patients, particularly those with walking disorders, have difficulty in following a steady and steady pace of walking. For these patients, walking on a tread with regular and continuous scrolling is a generator of falls. These patients can not use a treadmill alone. A therapist must watch every moment on each of them in order to be able to intervene quickly in case of fall or risk of falling.

SUMMARY OF THE INVENTION In response to the above-mentioned problem of the user's adaptability to the running rate of the tread, the applicant proposes a walking training device in which the rate of travel of the tread is imposed. by the user and not by the machine.

According to a first aspect, the invention relates to a walking training device comprising:

a treadmill comprising a tread and rolling members, and

- a chassis on which the treadmill is mounted.

This device is characterized in that it comprises a central core constituting a support structure for the rolling members and the tread, and in that the rolling members comprise:

a plurality of balls distributed around the central core, said central core comprising a plurality of first housings adapted to each receive one of the balls, and

- A cage trapping the plurality of balls to maintain said balls on the central core by allowing their mobility relative to said central core, the tread being adapted to slide on the balls and to drive said balls in rotation on the central core.

In this device, the tread is driven in displacement as the steps of the user. It is therefore the user himself who imposes the speed of displacement of the tread.

In the following description, the gait training device will be described with reference to an orthonormal marker XYZ, in which the plane XZ is a plane parallel to the surface of the ground on which the training device is placed. and in which the Y axis is an axis perpendicular to the XZ plane.

In addition, in this description, the arrangement of the balls of the device will be described with reference to the central core which constitutes the base of the conveyor belt, that is to say the support structure of the running gear and the tire strip. rolling. This central core has a surface and an underside, in substantially parallel planes, and a circumference or periphery perpendicular to the surface and sub-surface planes. The surface is the face of the central core closest to the user's walking surface. The underside is the face, opposite to the surface, the nearest of the soil surface.

In the description, "around the central core" will be understood to mean all the faces, surfaces, contours and / or sub-faces of the central core along which the tread is likely to move.

Advantageously, the tread surrounds the central core, the cage and the plurality of balls. Thus, the tread can be moved in all directions of the walking surface.

Advantageously, the plurality of balls comprises sliding balls distributed on the surface of the central core and housed in first housings of said central core. These sliding balls allow the sliding of the tread on the surface of the central core.

Advantageously, the plurality of balls comprises support balls distributed in the underside of the central core and housed in first housings of said central core. These support balls allow the displacement of the tread.

Advantageously, the sliding balls have a diameter smaller than the diameter of the support balls.

Advantageously, the frame comprises an inner wall equipped with second housings, the second housing being adapted to receive at least support balls contiguous to the support balls of the central core.

Advantageously, the support balls of the frame and the support balls of the central core are formed respectively on either side of the tread. This arrangement of the balls allows the tread to move smoothly, smoothly, smoothly, allowing the user to move on the treadmill as on a floor.

Advantageously, the plurality of balls comprises positioning balls or rollers positioned laterally on the central core and housed in first housings of said central core.

Advantageously, the chassis comprises positioning balls or rollers housed in the second housing of the frame and each contiguous to a ball or roller positioning the central core.

Advantageously, the positioning balls or rollers of the chassis and the positioning balls or rollers of the central core are formed respectively on either side of the tread. This arrangement of the balls or positioning rollers contribute to the fluidity of movement of the tread.

Advantageously, the gait training device comprises a safety device and / or a user retaining device able to be positioned vertically to the chassis so as to reassure and / or help maintain the user, especially when he is a patient with walking disorders.

Advantageously, the walking training device comprises an external structure in which is mounted the assembly formed of the frame and the treadmill, and a tilting system connecting the frame and the external structure to tilt said frame relative to the external structure. Such a configuration of the device makes it possible to simulate a sloping ground and to drive a user to walk on a slope.

BRIEF DESCRIPTION OF THE FIGURES Other advantages and characteristics of the invention will appear on reading the description, illustrated by the figures in which:

- Figure 1 shows an example of treadmill according to the prior art.

FIGS. 2A and 2B show views, respectively from the front and in perspective, of an example of a walking training device according to the invention.

FIG. 3 diagrammatically represents an example of a treadmill of the walking training device of FIG. 2.

- Figure 4 shows schematically an example of the treadmill of Figure 3 mounted in a frame of the walking device according to the invention.

- Figure 5 shows schematically an example of the frame block of Figure 4 mounted in an outer structure so as to be tilting.

- Figures 6A, 6B and 6C schematically show top views of different variants of the tilt system of the frame block in the outer structure. DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT

An exemplary embodiment of a gait device in which the rate of travel of the tread adapts to the user is described in detail hereinafter with reference to the accompanying drawings. This example illustrates the features and advantages of the invention. However, it is recalled that the invention is not limited to this example.

In the figures, the identical elements are identified by identical references. For questions of readability of the figures, the size scales between elements represented are not respected.

Figures 2A and 2B show a side view and a perspective view of the gait device according to some embodiments of the invention. This training device 100 comprises a treadmill 120 mounted in a frame 130 placed on the ground or on any other flat surface intended to receive the driving device 100. The treadmill 120 is adapted to be driven in motion by a patient or any other user, in walking position on said carpet.

The frame 130 is a rigid structure, for example made of metal or plastic, hollow, in which is placed the conveyor belt 120. The frame 130 may have, for example, a parallelepipedal or cylindrical basin shape with a narrow neck to surround the treadmill 120 while leaving free the surface of said carpet. The assembly consisting of the conveyor belt 120 and the frame 130 forms a frame unit 1 10. In some embodiments, the frame unit 1 10 is directly placed on the ground or on any flat surface parallel to the ground. In other embodiments, which will be described later, the frame unit 1 10 is mounted in an external structure 170 placed on the ground or on any flat surface parallel to the ground.

The treadmill 120 comprises a tread 121 intended to be moved by sliding on rolling members 122-124. Indeed, as will be described in more detail later, the user taking steps on the belt generates a displacement of the tread on the running gear. These rolling members comprise, as shown in Figure 3, a plurality of balls 122-124 distributed around a central core 126 and housed in said core. The central core 126 may be a plate, for example parallelepipedal or cylindrical, solid or partially hollow. The central core 126 can be made, for example, Titanium - which has the advantage of being very resistant - or Steel - which has the advantage of being cheaper than Titanium - or Aluminum - which has the advantage of being lightweight and have a good hygienic level - or even in composite materials - which have the advantage of being particularly light. The central core 126 may also be made using several of the aforementioned materials such as, for example, a composite material for the entire core with titanium reinforcements to make the core more impact resistant.

The central core 126 may comprise a plurality of housings 127, called first housings, adapted to each receive one of the balls 122-124. In some embodiments, each housing 127 is hollowed out of the material forming the central core 126. In other embodiments, the central core 126 is manufactured, for example by molding, with the plurality of housings 127. Depending on the material chosen for the central core 126, reinforcements, for example titanium, may be arranged in the housing or in the vicinity of said housing 127 to strengthen the core structure and / or facilitate the sliding of the balls 122-124 in their respective housings.

A cage 125 is provided around the central core 126 to trap the balls 122-124 to maintain them in their respective housing 127 while allowing their mobility in said housing. The cage 125 of the central core may be a box - of substantially identical shape to that of the central core 126 but substantially larger - whose walls have openings facing the housing 127 of the central core 126. According to one variant, the cage 125 may be a rigid or semi-rigid reinforcement, of the lattice type, having openings facing the housings 127 of the central core 126. The openings in the box or in the reinforcement have dimensions allowing partial traversing of the balls 122-124, that is to say the crossing of a portion less than half of the sphere forming each of the balls, this portion being called "external part of the balls". Thus, each of the balls 122-124 is placed in a housing 127 of the central core 126 and passes partly through an opening of the cage 125 so as to protrude from said cage while being maintained between the central core 126 and the cage 125 .

The tread 121 is an envelope made of a flexible material, of fabric or rubber type, mounted and stretched around the balls 122-124. The The material in which the tread 121 is formed has a predetermined elasticity and structure for forming an envelope which surrounds the entire assembly formed of the central core 126, the cage 125 and the balls 122-124. bearing 121 is in contact with the outer part of each ball 122-124, that is to say with the part of each of the balls which is outside the cage 125. In this way, any displacement of the strip 121 is accompanied by a rotation of the balls 122-124 in their respective housing 127.

The treadmill 120 may take the form, for example, of a right block or a cylinder whose height is small in front of the lateral dimensions (if right pad) or radial (if cylinder). In other words, the section of the treadmill 120 may have a parallelogram shape, for example a rectangle, or a disk shape. In the examples of FIGS. 2A and 2B, the treadmill 120 has a flat cylinder shape and comprises a cylindrical central core 126, surrounded by a cylindrical cage 125, itself surrounded by a tread 121 forming a cylindrical envelope. .

Housing 127, each intended to accommodate one of the balls 122-124, are distributed on the surface 126a and the underside 126b of the central cylindrical core 126 and on its circumference 126c. According to some embodiments, and as shown in the example of Figure 3, the balls 122-124 are distributed on the central core 126 according to their function. For example, sliding balls 122, intended to ensure the sliding of the tread 121, are distributed over the surface 126a of the central core; support balls 124, intended to support the central core 126 and ensure the displacement of the tread 121, are distributed on the underside 126b of the central core; positioning balls 123, intended to ensure the positioning of the central core in the chassis and the displacement of the tread 121, are distributed over the circumference of said central core 126.

The sliding balls 122 are, according to some embodiments, of dimensions smaller than the dimensions of the support balls 124 and positioning balls 123. The sliding balls 122 preferably have a diameter of less than 10 mm so as to ensure user, a feeling of flatness when walking. They may have, for example, a diameter of 5mm. The little the size of the sliding balls 122, relative to the support balls and the positioning balls, allows the tread 121 to slide on the central core 126, that is to say to move in a continuous and fluid manner, by developing a minimum effort. It also allows the user not to feel, under his feet, the undulations of the balls and to give him the feeling of walking on a flat structure such as soil.

The support balls 124 and the positioning balls 123 are balls of dimensions greater than the dimensions of the sliding balls 122 and whose role is to ensure the displacement of the tread around the central core 126. In a variant, the Support balls 124 and 134 have a diameter greater than that of the positioning balls 123 and 133. The positioning balls 123, 133 may have, for example, a diameter of the order of ten times the diameter of the sliding balls 122. The support balls 124, 134 may have, for example, a diameter of the order of twenty times the diameter of the sliding balls 122. In particular, the positioning balls may have a diameter of 50 mm and the support balls a diameter of 100mm.

These support balls 124 and positioning 123 are each associated with an identical ball, positioned in the frame. Each support ball 124 and positioning 123 of the treadmill 120 is adapted to interact with, respectively, a support ball 134 and a positioning ball 133 of the frame 130. Examples of pairs of support balls 124, 134 and pairs positioning balls 123, 133 are shown in Figure 4. As shown in Figure 4, the support balls 134 of the frame 130 and the positioning balls 133 of the frame 130 are housed in housings 137, called second housings, arranged in the inner wall 131 of the frame 130. A frame cage 135 is mounted at least partially along the inner wall 131 of the frame so as to maintain the support balls 134 and positioning 133 in their housings 137. As for the cage 125 of the central core, the cage 135 of the frame may be a rigid or semi-rigid frame type trellis having openings facing the housing 137 of the frame. According to a variant, the cage 135 of the frame may be a U-shaped receptacle - with dimensions substantially smaller than the dimensions of the inner pane 131 - whose walls have openings facing the housings 137 of the frame 130. openings in the receptacle or in the frame have dimensions allowing the partial crossing of the balls 133-134, that is to say the crossing of a portion less than half of the sphere forming each of the balls, this portion being called "outer part of the balls". Thus, each of the balls 133-134 is placed in a housing 137 of the frame 130 and passes partly through an opening of the cage 135 so as to protrude from said cage while remaining between the frame 130 and the frame cage 135 .

1. The support balls 124 of the central core and the support balls 134 of the frame are identical balls, of the same dimensions and made of the same material. Each support ball 124 is positioned opposite a support ball 134 and is separated from said ball 134 by the tread 121. Each support ball 134 is mounted by ball joint in a housing 137 of the frame.

Similarly, the positioning balls 123 of the central core and the positioning balls 133 of the frame are identical balls, of the same dimensions and made of the same material. Each positioning ball 123 is positioned opposite a positioning ball 133 and is separated from said ball 133 by the tread 121.

Thus, the tread 121, which surrounds the central core 126 and all the balls 122-124 of the core, is positioned so as to separate the support balls 124 from the core of the support balls 134 of the frame and the balls of positioning 123 of the core of the positioning balls 133 of the frame. The interaction between the support balls 124 of the core and the support balls 134 of the frame makes it possible to limit the areas of the tread in contact with the chassis and / or the core and thus limit the friction of the tread when of his displacements. The displacement of the tread 121 on the sliding balls 122 is thus facilitated so that the patient does not perceive this movement under his feet.

The interaction between the positioning balls 123 of the core and the positioning balls 133 of the frame makes it possible both to ensure the proper positioning of the tread 121 around the central core 126 and to assist in the movement of said tread. bearing on the rolling balls 122. The balls of positioning 123, 133 further allow the tread to be stretched so that it is not in contact with the cage 125 of the central core.

In some embodiments, the positioning balls 123 and the positioning balls 133 are in a cylindrical, roll-like shape, positioned along axes parallel to each other. The displacement of the tread 121 thus causes a rotation of each of the rollers 123, 133 in opposite directions of rotation.

It is understood from the foregoing that the frame structure 130 surrounds the treadmill 120 except the upper face 121 of the tread 121 - also known as the walking surface - which is intended to accommodate the user. When the user takes steps on the treadmill 120, the tread 121 is driven in translation by the sliding balls 122. In other words, the tread slides on the sliding balls. The positioning balls 123, 133 and the support balls 124, 134 accompany this sliding so that the tread can be translated in all directions of the plane containing the walking surface 121 s. In this way, it is the user who imposes his walking pace on the training device. The user is not forced to adapt to a rhythm imposed by the machine; he can move at his own pace on the treadmill and it is the tread that follows his movements. In applications in the medical field, the training device as just described promotes proprioception with unpredictable changes in rhythm and direction.

In certain embodiments, in particular those applied to the medical field shown in FIGS. 2A and 2B, the training device comprises a safety device 140 ensuring in particular the balance or the maintenance of the patient. This safety device 140 may comprise, for example, an annular structure 141 adapted to surround the patient and define a walking space. This annular structure 141 may be equipped at its center with a buoy 142 of dimensions adaptable to the corpulence of the patient. This buoy 142 may be a plastic or rubber ring whose inner circumference is variable and whose outer circumference is adapted to the annular structure 141.

In a variant, the buoy 140 is a hollow ring filled with a gas, for example air, the type of child's buoy or inner tube. The pressure of the gas the inside of the buoy 142 may vary depending on the size of the patient or the desired support.

In a variant, the annular structure 141 and the buoy 142 may be equipped with a door system making it possible to open and close the annular structure and the buoy to allow the patient to be installed on the conveyor belt 120.

The safety device 140 may further comprise telescopic feet 143 fixed to the annular structure 141 to ensure a vertical displacement of said annular structure and the buoy 142. These telescopic legs 143 can be placed on the ground, around the frame 130, or fixed in bases 1 1 1 secured to the frame 130. These telescopic legs 143 allow to lower the annular structure and / or the buoy to allow the patient to be installed on the treadmill 120 and to reassemble to maintain the patient.

The buoy 142 can be used to support the patient and help him to maintain the standing position. In this case, the buoy must be inflated enough to surround the patient. Buoy 142 can also be used to help the patient maintain balance and reassurance. In this case, the buoy must be slightly inflated to surround the patient without holding it.

The drive device may also include a patient restraint system 150. This restraint system may be in the form, for example, of a belt 151 to retain the patient in case of a fall. This shoulder belt 151 may be fixed on the annular structure 141, or on any other structure situated in the vicinity of the treadmill 120, by means of fasteners 152. These fasteners 152 may be, for example, equipped with a locking pawl associated with an accelerometer so that the shoulder 151 is blocked as soon as an acceleration threshold corresponding to a fall of the patient is detected.

In some embodiments, the gait device includes motors connected to the support balls and / or positioning balls to control the speed of travel of the tread 121 and, in particular, to avoid any acceleration of said tread. These motors, positioned in frame 130, for example in the vicinity of the support balls 124, are connected to a control unit able to control the speed and / or the direction of rotation of the support and / or positioning balls. In some embodiments, the chassis unit 1 10 as just described is mounted in an external structure 170, itself placed on the ground. The outer structure 170 may be made, for example, of the same material as the frame 130 and have a shape similar to said frame but of external and internal dimensions so that the entire frame unit can be contained in the outer structure. The frame unit 1 10 can be fixed in the external structure 170. The frame unit can also be movable in the external structure thus making it possible to incline the surface 121 s of the conveyor belt 120 with respect to the surface of the ground, that is, ie with respect to the XZ plane. Such inclination makes it possible to simulate, for the patient, a rising slope and / or a downward slope. In these embodiments, an example of which is shown in FIG. 5, the walking training device 100 comprises a tilting system 160 adapted to incline the frame block 101 formed of the frame 130 and the conveyor belt 120. , compared to the XZ plane. In these embodiments, the frame unit 1 10, as previously described, is mounted in an external structure 170 and connected to said external structure by the inclination system 160. This inclination system 160 can be controlled to move, in the Y direction, at least a portion of the frame block 1 10 so that said frame block is inclined at a predetermined angle with respect to the XZ plane.

For this, the inclination system 1 60 may comprise, for example, at least two cylinders 1 61 -1 64 positioned between the external structure 170 and the frame 130. The cylinders can be two in number, for example the jacks 1 61 and 162, positioned at opposite positions of each other of the frame. In the case of a rectangular frame block, one of the cylinders is positioned at the front of the carpet while the other cylinder is positioned at the rear of the carpet. In the case of a round frame block, the two jacks 1 61, 1 62 are positioned on either side of the diagonal of said frame unit, as shown schematically in FIG. 6A. The opposed jacks 1 61, 1 62 are fixed on the external structure 170 by pivotal links so as to allow an inclination in one direction or the other of the treadmill 120. The activation of the jacks 1 61 and / or 162 allows to generate a positive slope (rising slope) or a negative slope (downward slope) of a variable angle. The inclination of the two opposing cylinders 61, 162 allows a relatively high degree of slope for a reduced cylinder stroke. According to one variant, the inclination system 1 60 may comprise two jacks 161, 1 64 distributed on the same half of the frame unit and a pivot 1 65 fixed on the other half of the frame unit 1 10, as shown diagrammatically in the figure 6B. In the case of a rectangular frame block, the two cylinders 1 61, 1 64 can be both attached to the front of the frame block 1 10, by ball joints on the outer structure 170 and by pivot connections on the block frame. The pivot 1 65 is then attached to the rear of the frame unit. In the case of a round frame block, the two jacks 1 61, 164 can be both fixed on the same half-circumference of the frame block 1 10, by ball joints on the outer structure 170 and by pivot links on the chassis block. The pivot 1 65 is then fixed on the other half-circumference of the frame block, as shown in Figure 6B. In this variant, only a portion of the frame block rises relative to the XZ plane while the other part pivots. This variant, relatively simple to use, allows a stronger attachment but a lower degree of slope than the variant of Figure 6A.

According to another variant, the inclination system 160 may comprise three jacks 1 61, 1 63, 1 64 distributed over the contour of the chassis unit, as shown schematically in FIG. 6C. They can be distributed, for example, so as to form an equilateral triangle. Each cylinder 161, 1 63, 1 64 can be fixed by a ball joint connection to the chassis block and by a pivot connection on the external structure 170. This variant makes it possible to generate all kinds of inclinations, which makes it possible, for example, to simulate a displacement on variable slopes.

Although described through a number of examples, variants and embodiments, the gait training device according to the invention comprises various variants, modifications and improvements which will become apparent to those skilled in the art, being understood that these variants, modifications and improvements are within the scope of the invention.

Claims

1. Walking training device (100) comprising:

a treadmill (120) comprising a tread (121) and rolling members (122-124), and

a chassis (130) on which the treadmill is mounted,

characterized in that it comprises a central core (126) constituting a support structure for the rolling members and the tread, and

in that the rolling members comprise:

a plurality of balls (122-124) distributed around the central core (126), said central core comprising a plurality of first housings (127) adapted to each receive one of the balls (122-124), and

a cage (125) trapping the plurality of balls to maintain said balls on the central core by allowing their mobility with respect to said central core, the tread (121) being able to slide on the balls and to drive said balls in rotation on the central core.

Gait training device according to claim 1, characterized in that the tread (121) surrounds the central core (126), the cage (125) and the plurality of balls (122-124).

3. Walking training device according to claim 1 or 2, characterized in that the plurality of balls comprises sliding balls (122) distributed on the surface of the central core (126) and housed in first housings (127). of said central core.

4. Walking training device according to any one of claims 1 to 3, characterized in that the plurality of balls comprises support balls (124) distributed in the underside of the central core (126) and housed in first housings (127) of said central core.

Gait training device according to claims 3 and 4, characterized in that the sliding balls (122) have a diameter smaller than the diameter of the support balls (124).

6. Training device according to claim 5, characterized in that the frame comprises an inner wall (131) equipped with second housings (137), the second housing being adapted to receive at least support beads (134). ) contiguous to the support balls (124) of the central core.

7. Gait training device according to claim 6, characterized in that the support balls (134) of the frame and the support balls (124) of the central core are formed respectively on either side of the strip. rolling (121).

Gait training device according to one of Claims 1 to 7, characterized in that the plurality of balls comprise positioning balls or rollers (123) positioned laterally on the central core (126) and housed in first housings (127) of said central core.

9. A gait training device according to claim 8, characterized in that the frame comprises positioning balls or rollers (133) housed in second housing (137) of the frame and each contiguous to a ball or positioning roller (123) of the central core.

Gait training device according to claim 9, characterized in that the positioning balls or rollers (133) of the frame and the positioning balls or rollers (123) of the central core are respectively formed on each side and other of the tread (121).

1 1. Gait training device according to any one of claims 1 to 10, characterized in that it comprises a safety device and / or a user retaining device adapted to be positioned vertically of the frame.

12. Gait training device according to any one of claims 1 to 1 1, characterized in that it comprises: an external structure (170) in which is mounted the assembly formed of the frame and the conveyor belt, and

a tilt system (160) connecting the frame and the outer structure to tilt said frame relative to the outer structure.