FR3158879A1 - Massager - Google Patents

Abstract

One aspect of the invention relates to a massage apparatus (10) comprising a massage head (1) and a control system (2), the massage head (1) being intended to be applied to a subject's skin, wherein the control system (2) is configured to control the massage head (1) such that a depression is generated in the massage head (1) according to a depression function representing a temporal variation of the depression generated in the massage head (1), wherein the control system (2) is further configured to add, to the depression function, a sinusoidal vibration with a frequency between 25 Hz and 45 Hz. Figure to be published with the abstract: Figure 2

Description

Massager TECHNICAL FIELD OF THE INVENTION

The technical field of the invention is that of massage devices, and in particular massage devices comprising a massage head and a control system configured to control the massage head so that a vacuum is generated in the massage head.

TECHNOLOGICAL BACKGROUND OF THE INVENTION

Various massage techniques are used depending on the treatments to be performed. Generally speaking, they all involve applying constraints to the subject using pressure and/or movement and/or pinching.

There are many types of devices to make the masseur's job easier.

Among the various existing devices, it was considered to use equipment using a simple mechanical action, for example by means of assemblies comprising balls or balls mounted on a support housing, possibly allowing the distribution of a treatment product (cream, liquid).

Massage devices have also been proposed that implement suction of the subject's skin. Such suction makes it possible to form a skin fold inside an internal chamber of a massage head. Mechanical actuators such as rollers or valves then exert actions, for example pressure or friction on this skin fold, to induce a predefined massage effect on the subject. Such a solution is for example described in the applicant's patent EP3151805.

Current massage devices allow skin suction in two modes:

– a so-called “continuous” mode, in which suction is generated by applying a constant depression in the massage head, the suction power being chosen by the operator; and

– a so-called “alternating” mode, comprising a succession of suctions and “releases” thanks to an alternating succession of high depressions and low depressions in the massage head.

Figures 1a and 1b illustrate such modes known from the state of the art. In particular, the FIG. 1 represents the temporal evolution of the depression within the massage head in continuous mode, and the FIG. 1 represents the temporal evolution of the depression within the massage head in alternating mode.

In these two figures, the x-axis represents time and the y-axis represents the depression generated within the massage head. In continuous mode, shown in the FIG. 1 , suction is applied to the subject's skin by generating a constant depression, equal to a fixed pressure value p _F and possibly selected beforehand by the operator, in the massage head. In alternating mode, shown in the FIG. 1 , a succession of suctions and releases is applied to the subject's skin. For this, suction phases, during which a depression having a value p ₁ is generated in the massage head, alternate with phases during which no depression is generated in the massage head (i.e. the surface of the subject's skin is at atmospheric pressure). In the example of the FIG. 1 , the duration ΔT ₁ of the depression phases and the duration ΔT ₀ of the phases without depression are different, but they can be equal. Also, alternatively to the example of the FIG. 1 , it is possible to alternate between depression phases equal to a first value p ₁ for a duration ΔT ₁ and depression phases equal to a second value p ₀ < p ₁ for a duration ΔT ₀ (in the example of the FIG. 1 , the low value p ₀ is equal to 0, but this is not mandatory). The values p ₀ and p ₁ are fixed and can be selected in advance by the operator (i.e. the subject who manipulates the massage device).

As mentioned above, both modes allow the subject's skin to be sucked in to form a skin fold inside the massage head. Mechanical actuators in the massage head, such as flaps or rollers, then massage the sucked skin.

However, the subject may feel some discomfort or even pain when grasping the skin fold.

The invention improves the situation.

The invention provides a solution to the problems mentioned above by adding a sinusoidal vibration with a frequency between 25 Hz and 45 Hz to the depression function. It has been determined from tests that such a vibration has the effect of reducing or even completely eliminating the subject's pain.

One aspect of the invention thus relates to a massage apparatus comprising a massage head and a control system, the massage head being intended to be applied to the skin of a subject, in which the control system is configured to control the massage head so that a depression is generated in the massage head according to a depression function representing a temporal variation of the depression generated in the massage head, in which the control system is further configured to add, to the depression function, a sinusoidal vibration with a frequency of between 25 Hz and 45 Hz.

By "depression" is meant a negative pressure difference in the massage head compared to atmospheric pressure. In other words, the pressure inside the massage head is lower than atmospheric pressure, and the depression represents the (negative) difference between the pressure in the massage head and atmospheric pressure. Such a depression has the effect, when the massage head is applied against the subject's skin (on the surface thereof), of sucking the skin inside the massage head. In existing devices, this suction makes it possible to form a skin fold, which can then be worked (massaged) using mechanical actuators, such as valves or rollers. According to the present invention, this suction is no longer constant, and allows a massage effect of the skin fold according to a pattern defined by the shape of the curve representative of the applied depression function.

By “depression function” is meant the function (or, equivalently, its representative curve, i.e. its shape) representing the variations in depression within the massage head over time.

By "sinusoidal vibration" is meant a sinusoidal function added to the depression function. In other words, if the depression function is denoted , the depression obtained after adding vibration is: , Or is a sinusoidal function with a frequency between 25 Hz and 45 Hz.

A "sinusoidal function" is a function whose representative curve exhibits sinusoidal variations or variations that can be related to sinusoidal variations. This category of functions includes sine functions (as well as cosine functions), but also square wave, sawtooth and triangular functions.

It is noted that in the present application, the operator refers to the individual who manipulates the massage device, and the subject refers to the individual to whom the massage head is applied. The operator and the subject may be the same individual or two different individuals.

In particular, the frequency of sinusoidal vibration can be between 27 Hz and 35 Hz. Such frequencies have proven to be particularly comfortable for massage and effective for pain relief.

In embodiments, the sinusoidal vibration has an amplitude between 30 mbar and 70 mbar.

These amplitudes have proven particularly effective in reducing or eliminating pain.

In embodiments, the depression function is a constant function or a step function.

As mentioned above, these functions are used in state-of-the-art devices to capture the skin fold. Adding vibrations to these functions can reduce or eliminate the pain resulting from this capture of the skin fold.

In other embodiments, the depression function is continuous, periodic, and non-constant.

By "continuous" it is understood that the curve representing the depression function does not present any jump (unlike for example the niche function of the FIG. 1 ). By "periodic" it is understood that the curve representing the depression function repeats itself with a given period. By "non-constant" it is understood that the function takes at least two different values (in this case, an infinity of different values since it is continuous) during a period. It is possible for the function to have plateaus or levels, that is to say that the function can be constant over a time interval strictly less than the period, but it cannot be constant over the entire period (unlike the function represented on the FIG. 1 For example).

Such vacuum functions advantageously make it possible to obtain specific physiological effects, to reproduce or even surpass manual massage gestures. Indeed, the inventors of the present invention have determined that variations over time in the vacuum function make it possible to perform a vacuum massage function, which is not the case in existing devices (in which the massage function is only operated by the action of the rollers or flaps). Furthermore, by varying the frequency of the applied vacuum function, different depths of the skin can be reached, which makes it possible to obtain varied physiological effects.

In particular, the depression function can be a piecewise affine function or a sinusoidal function.

By "piecewise affine" it is understood that the curve is composed of straight line segments (increasing, constant or decreasing). Here, it is assumed that there are no "jumps" at the junctions between the straight line segments.

In other embodiments, the depression function corresponds to a concatenation of at least two portions of at least two respective basis functions, the at least two basis functions being chosen from: constant functions, affine or piecewise affine functions, sinusoidal functions and sigmoid functions.

By "concatenation" it is meant that the function is defined over several portions of the period, and that it has different expressions depending on the portions of the period (more precisely, the function follows a different expression over at least two portions). For example, the function can be a portion of a sinusoidal function connected to a constant function, itself connected to a sinusoidal function (identical or distinct from the first sinusoidal function). Here, it is assumed that there is no jump in value at the junctions between the portions.

In embodiments, the depression function has a period between 0 Hz and 20 Hz.

This frequency range corresponds to the frequencies that produce the most interesting physiological effects in the context of a cosmetic treatment. It is noted that the frequency of the vibration is more important than the frequency of the depression function.

In particular, the period can be between 0 and 16 Hz. This frequency range allows access to the deeper layers of the skin.

In embodiments, the control system includes a suction device connected to the massage head by a suction conduit configured to generate suction, said suction generating a vacuum in the massage head.

Another aspect of the invention relates to a cosmetic treatment method implemented by a massage device comprising a massage head and a control system, the massage head being intended to be applied to the skin of a subject, the method comprising:

- controlling, by the control system, the massage head so that a depression is generated in the massage head according to a depression function representing a temporal variation of the depression generated in the massage head;

in which a sinusoidal vibration with a frequency between 25 Hz and 45 Hz is added to the depression function.

The invention and its various applications will be better understood by reading the following description and examining the accompanying figures.

BRIEF DESCRIPTION OF THE FIGURES

Other characteristics and advantages of the invention will appear on reading the description, which can be read in conjunction with the figures. These figures are presented for information purposes only and in no way limit the invention.

There FIG. 1 represents the temporal evolution of the depression within the massage head in the continuous mode of the state of the art.

There FIG. 1 represents the temporal evolution of the depression within the massage head in the alternating mode of the state of the art.

There FIG. 2 represents a massage device according to one embodiment of the invention.

There FIG. 3 represents a cosmetic treatment method implemented by a massage device according to one embodiment of the invention.

There FIG. 4 represents an example of a control module in one embodiment of the invention.

Figures 5a and 5b show the depression curves corresponding to Figures 1a and 1b when vibration is activated.

Figures 6a and 6b show another example of a generated depression curve, with and without vibration, respectively.

Figures 7a and 7b show another example of a generated depression curve, with and without vibration, respectively.

Figures 8a and 8b show another example of a generated depression curve, with and without vibration, respectively

Figures 9a and 9b show another example of a generated depression curve, with and without vibration, respectively.

DETAILED DESCRIPTION

There FIG. 2 schematically illustrates a massage device 10 according to one embodiment of the invention. The massage device 10 comprises a massage head 1 (also called a treatment head) intended to be applied against the skin of a subject and a control system 2. The control system 2 is configured to control the massage head 1 so that the massage head generates a vacuum.

For example, the control system 2 may be an electropneumatic system comprising a control module 21 and a suction device 22 connected to the control module 21, the suction device 22 being connected to the massage head 1 by a suction conduit 3. The suction device 22 comprises a suction means (not shown) configured to generate suction, such as a pump, thereby causing a vacuum within the massage head 1. The control module 21 may thus be configured to send to the suction device 22 a control signal according to a given vacuum function, and upon receipt of this control signal, the suction device 22 may be configured to generate suction to generate, in the massage head 1, a vacuum corresponding to the vacuum function of the control signal.

Thus, the control system 2 makes it possible to control a depression within the massage head 1 according to a given depression function. A depression function represents a variation of the depression generated in the massage head 1 over time. Examples of depression functions are shown in Figures 1a and 1b, 6a, 7a, 8a and 9a.

As mentioned above, the curves in Figures 1a and 1b represent a continuous vacuum function and a notched vacuum function, respectively. These two functions are used in a known manner to capture the skin fold. The massage function is then performed by mechanical actuators of the massage head 1, such as flaps or rollers.

The curves in Figures 6a, 7a, 8a, and 9a represent more advanced vacuum functions. These functions are continuous, periodic, and non-constant. As detailed below, such functions can achieve specific physiological effects. The variation in the applied vacuum itself has a massaging effect on the skin, and, depending on the frequency of the vacuum function, it is possible to reach different depths of the skin.

The vacuum function may be provided to the control system 2 by a user interface 4, for example a set of buttons and/or a touch screen. For example, the user interface 4 may be connected to the control module 21, and the operator may select, via the user interface 4, a vacuum function from a plurality of predefined vacuum functions stored in the control module 21.

In embodiments, the control module 21 may store a plurality of predefined vacuum functions. Each vacuum function may be associated with a respective physiological effect (e.g., firming, palpate-roll, kneading, tapping, effleurage, friction, compression, smoothing, etc.). An operator may select, via the user interface 4, a vacuum function from the plurality of stored vacuum functions, or a desired physiological effect from the plurality of physiological effects associated with the stored vacuum functions.

Alternatively or in addition, the operator can send to the control module 21, via the user interface 4, a set of parameters to generate a vacuum function from these parameters. Upon receipt of these parameters, the vacuum function can be generated within the control module 21, which then transmits to the suction device 22 a command to generate suction so that the vacuum generated in the massage head 1 follows the desired vacuum function.

It is understood that the above two embodiments may be combined. For example, on a home screen of the user interface, the operator may be offered a choice between selecting a predefined vacuum function and entering a set of parameters to generate a vacuum function.

An example of a control module 21 is shown in FIG. 4 .

In this example, the control module 21 comprises a memory 211 for storing instructions allowing the transmission of a command to the suction device 22 upon receipt of a corresponding instruction via the user interface 4, and possibly depression functions, which may, depending on the embodiments, be associated with respective physiological effects.

The control module 21 further comprises a circuit 212. This circuit 212 may be, for example, a processor capable of interpreting instructions in the form of a computer program, an electronic card whose steps of the method of the invention are described in the silicon, or even a programmable electronic chip such as an FPGA chip (for “Field-Programmable Gate Array” in English).

The control module 21 comprises an input interface 213 for receiving an instruction relating to a vacuum function to be applied or parameters relating to the vacuum to be applied, and an output interface 214 for providing a command to the suction device 22. As mentioned above, the control module 21 may be connected to a user interface 4 for receiving a vacuum instruction or parameters. Alternatively, the user interface may be integrated with the control module 21. In these embodiments, the control module 21 may comprise input devices such as a screen (possibly touch-sensitive), a keyboard, a set of buttons, a touchpad, a microphone coupled to a voice control module, etc.

Referring again to the FIG. 2 , the massage head 1 may comprise a roller arranged in an internal chamber of the massage head, to perform massage movements (for example of the palpate-roll type). The suction duct 3 may be connected to the internal chamber so as to establish a vacuum therein. The internal chamber is intended to be applied against the skin of a subject to be massaged to form a skin fold. The suction device 22 is therefore intended to generate a vacuum in the ambient air to suck the subject's skin (and form a skin fold). More generally, the massage head may comprise at least one mechanical actuator, for example one or more motorized rollers and/or one or more valves, to massage the skin previously sucked into the internal chamber of the massage head 1 by the control system 2. In embodiments, the operator may adjust certain parameters, for example the speed and/or direction of rotation of the rollers or the flapping frequency of the valve, via the user interface 4.

As mentioned above, in the devices of the state of the art, the depressions generated in the massage head 1 operate in two modes: a continuous mode (shown in FIG. 1 ) and an alternating mode (represented in the FIG. 1 ). These two modes allow a skin fold to be formed, which can then be massaged via the mechanical actuators of the massage head 1.

With more advanced vacuum functions, including continuous, periodic and non-constant functions, the vacuum applied via the massage head 1 not only lifts the skin and thus forms the skin fold, as in the prior art, but also contributes to massaging the skin, in the same way as mechanical actuators. This makes it possible to reproduce manual gestures of a practitioner, or even surpass them. Indeed, the inventors of the present application have realized that, depending on the vacuum functions applied, different depths of skin could be reached and massaged according to varying amplitudes, which allows for more targeted and more effective treatments, but also more precise and more reproducible than a manual massage.

For example, by using a sinus-type vacuum function, the capture of the skin fold is advantageously optimized to be carried out flexibly and proportionally to the action of the valve. Once the skin fold is captured, vacuum functions with oscillations make it possible to work on the elasticity, tone and/or firmness of the skin. The massage function generated by such vacuum functions is thus much more advanced, effective and targeted than when it is carried out solely by the mechanical actuators of the massage head.

Indeed, the variation of depression applied to the skin makes it possible to massage different layers of skin and to access different depths of skin. In other words, this variation of depression makes it possible to achieve an additional massage function compared to the massage function of mechanical actuators. It is therefore possible to envisage a massage solely by depression (suction) effect, without mechanical actuators.

According to the present invention, the control system 2 is further configured to add, to the depression function , a sinusoidal vibration of the form:

with the amplitude of the vibration and the vibration period (with the vibration frequency).

Thus, the depression actually generated within the massage head 1 is of the form:

The frequency of the vibration is between 25 Hz and 45 Hz. Generally speaking, to obtain the desired effect it is preferable that the vibration frequency is higher than the frequency of the depression function: , ie . In addition, it is preferable that the vibration amplitude is less than the amplitude of the depression function. For example, the vibration amplitude can be between 1/10 and 1/2 times the amplitude of the depression function.

Figure 5a thus represents a function obtained when the initial depression function is that of Figure 1a, and Figure 5b thus represents a function obtained when the initial depression function is that of the FIG. 1 .

It was determined, through tests conducted on a large number of subjects and in collaboration with massage specialists, that such vibration could reduce or even completely eliminate pain during application of the massage head to the skin.

In particular, the frequency The vibration frequency can be between 27 Hz and 35 Hz. Such frequencies have proven to be particularly comfortable for massage and effective for pain relief.

For example, the amplitude The vibration can be between 30 mbar and 70 mbar. These amplitudes have proven particularly effective in reducing or eliminating pain.

By coupling a depression curve with vibration as above, a deep massage effect is obtained (via the depression function curve), to which is superimposed a superficial massage effect (via vibration) which allows the pain created by the deep massage to be reduced or erased.

Of course, the above vibration can be any sinusoidal function of type Or , with , And three real parameters.

The vibration can also be a square wave function (also called a square wave function) of the type:

The vibration may also be, depending on the embodiments, a triangular function or a sawtooth function.

The massage device 10 can operate in two modes: a mode without vibrations (in this case, the vacuum generated follows the “initial” vacuum function ) and a mode with vibrations (in this case, the depression generated follows the depression function with vibrations ). The operator can select, via input interface 4, one or the other of the modes.

There FIG. 3 represents a cosmetic treatment method implemented by a massage device according to one embodiment of the invention. The steps of the FIG. 3 can be implemented by the control system 2.

In one embodiment, in a step 310, parameters relating to a desired depression are received by the control system 2, for example via the user interface 4 (which may be connected or integrated with the control system 2). In step 320, a depression function may be generated by the control system 2 (for example, by the control module 21) according to the parameters received in step 310.

In another embodiment, depression functions are recorded in the control system 2 (for example in a memory of the control module 21). Each depression function can be associated with a respective physiological effect. Thus, during a step 330, data relating to a physiological effect can be received by the control system 2. This data can be generated after receiving, via the user interface 4 (which can be connected or integrated with the control system 2), a selection of the physiological effect desired by the operator. For example, the data can be an identifier of the physiological effect among the plurality of physiological effects associated with the plurality of recorded depression functions. In step 320, the control system can thus retrieve the depression function corresponding to the selected physiological effect.

Alternatively, the operator can directly select the desired vacuum function. In this case, in step 330, data for selecting a vacuum function from among the plurality of vacuum functions can be received, and in step 340, the control system can retrieve the selected vacuum function.

As mentioned above, the above embodiments are not mutually exclusive: on the same massage device 10, the operator can choose whether he wants to generate a depression function from parameters that he sets (steps 310, 320) or whether he wants to use a depression function already recorded (steps 330, 340).

Once the vacuum function has been generated (step 320) or recovered (step 340), if the “vibration” mode is activated on the massage device 10 (test 350, arrow “Y”), a sinusoidal vibration is added to the vacuum function (step 360). The control system can then control (step 370) the massage head so that a vacuum is generated in the massage head according to the vacuum function with vibration (i.e. according to the function ). For example, the control module 21 can control a suction in the suction device 22 so that the suction thus generated in the suction device generates a depression within the massage head 4 which follows the function .

If the “vibration” mode is not activated on the massage device 10 (test 350, arrow “N”), the control system can control (step 370) the massage head so that a vacuum is generated in the massage head according to the initial vacuum function (i.e. according to the function ). For example, the control module 21 can control a suction in the suction device 22 so that the suction thus generated in the suction device generates a depression within the massage head 4 which follows the function .

It is noted that the vacuum actually generated in the massage head 4 may differ from the desired vacuum function (with or without vibration). For example, there may be losses in the suction duct 3 or the massage head 4, which cause the vacuum in the massage head not to follow the desired vacuum function exactly.

Other examples of depression functions (with and without vibration) are now presented.

Figure 6a represents a “sinus” type depression function. The depression thus generated in the massage head is a function of the type: , Or represents time, and are real coefficients.

The coefficients can be predefined or selected by the operator.

For example, the operator can set different parameters, including:

- a maximum value P _max of depression;

- a minimum value P _min of depression;

- a period or a frequency of depression.

The depression function can then be a function of the form:

The depression function thus obtained has a frequency oscillation , between two extrema P _min and P _max .

Surprisingly, it was found, through tests carried out in collaboration with expert massage practitioners, that such a vacuum function has a pumping effect on the skin. By adjusting the frequency, it is possible to act on different depths of the skin, and therefore to obtain different physiological effects.

It is understood that a depression function similar to that of the FIG. 6 can be obtained from other functions. For example, by concatenating two portions of sigmoid functions (S-curves), one increasing and the other decreasing, we obtain a curve similar to the curve of a sine function over a period. By "concatenation", it is understood that the two portions of curves are connected (for example, a first portion of an S-curve increasing over an interval [0; T/2] and a second portion of a decreasing S-curve of the same amplitude as the S-curve increasing over an interval [T/2; T]). The connection is made in such a way that the "concatenated" curve thus obtained is continuous (in the mathematical sense of the term).

There FIG. 6 represents the depression function of the FIG. 6 , to which a sinusoidal vibration has been added, i.e. the function:

As mentioned above, such vibration helps to reduce or even eliminate painful sensations associated with the application of depression to the skin.

Another example of a depression function is shown in FIG. 7 .

There FIG. 7 represents a depression function of the “S-curve” type. The depression thus generated in the massage head is a function of the type:

Or represents time, represents a minimum depression value, represents a maximum depression value, represents an increasing sigmoid function going from has , represents a decreasing sigmoid function going from has , corresponds to the transition time (i.e. the growth time from a low plateau to a high plateau, or the decrease time from a high plateau to a low plateau), corresponds to the duration of a high plateau (i.e. the duration during which the depression is equal to the maximum power ) And corresponds to the duration of a high plateau (i.e. the duration during which the depression is equal to the maximum power ). The above formula thus represents the variation of depression over the time interval . The function can then be repeated to obtain a periodic function of period .

In the example of Figure 7a, the duration of a high plateau is equal to the duration a low tray, but this is not mandatory.

The portion of the curve above is therefore the concatenation of an increasing sigmoid function over a time , of a constant high depression (high shelf) for a while , of a decreasing sigmoid function for a time and a constant low depression (low plateau) for a time .

Such a function can be defined by the following “minimal” parameter set (i.e. comprising a minimal number of parameters allowing the depression function to be completely defined):

– minimum value of depression;

– maximum value of depression;

- period or frequency depression;

- duration of a high plateau; and

– duration of the transition (T _SC , which therefore corresponds to the duration of the portion of the S curve).

Rather than setting the transition duration, it is possible to set a parameter, here called the "transition parameter", corresponding to the percentage of the complete period what should the transition period represent? . In other words, if is the transition parameter (between 0% and 50%), the transition duration is: .

Optionally, the transition parameter can be a discrete variable taking a finite and predetermined number of values. For example, the transition parameter can correspond to the number of tens of percent of the period to which the transition duration corresponds . For example, if , this means that represents 40% of the full period , ie .

It is noted that the above transition parameter allows, from the period or frequency , to find the value of the transition duration . Any parameter allowing to go back to the value of the transition duration , generally called the "transition duration parameter", can be used.

Similarly, rather than defining the duration from the top tray, it is possible to define a parameter, called here "cycle ratio", which corresponds to the percentage of the complete period what the cumulative duration should represent of rise and high plateau. In other words, if is the duty cycle (strictly between 0% and 100%), we have: .

It is noted that knowledge of (Or ), (Or ) and of (Or ) allows you to determine the duration of a low plateau , and therefore of all the variables which intervene in the equation above defining the curve of the FIG. 7 .

Surprisingly, it was found, through tests carried out in collaboration with expert massage practitioners, that such a vacuum function had a "palpate-roll" effect. By adjusting the frequency, it is possible to act on different depths of the skin.

There FIG. 7 represents the depression function of the FIG. 7 , to which a sinusoidal vibration has been added, i.e. the function:

with defined as above.

Another example of a depression function is shown in FIG. 8 .

The depression function of the FIG. 8 corresponds to the depression function of the FIG. 7 , on which oscillations on the high plateaus have been added.

This new depression function can be defined by a "minimal" parameter set including the minimal parameter set of the depression function of the FIG. 6 , as well as two parameters specific to the oscillation added on the high plate:

– a discrete parameter N _osc corresponding to the number of oscillations on the upper plate (in the example of the FIG. 8 , this parameter is equal to 2); and

– a real A _osc parameter corresponding to the amplitude of the oscillation.

For example, the oscillation can be a sine or cosine function, whose frequency is directly related to the number N _osc of oscillations on a high plateau. The amplitude A _osc corresponds to the desired depression amplitude on the oscillation:

with the frequency of oscillations and the period of the oscillations. We have: .

Thus, the curve represented on the FIG. 8 can be constructed by concatenating a portion of an increasing S-curve, a portion of the cosine (or sine) function above, and a portion of a decreasing S-curve. In other words, with respect to the FIG. 7 , the high plateau is replaced by a portion of a sinusoidal curve.

In embodiments, oscillations could be added to the low platters in addition to or instead of the high platters.

As before, the connections between the portions of S-curves (increasing and decreasing portions between the high and low plateaus) and the portions of sinusoidal functions representing the oscillations are made in such a way as to obtain continuity of the entire curve of the depression function.

It has been determined that the addition of oscillations on the high plates allows for a more effective palpate-roll type massage than with the vacuum function of the FIG. 7 , adding a higher frequency massaging effect during skinfold shots.

There FIG. 8 represents the depression function of the FIG. 8 , to which a sinusoidal vibration has been added, i.e. the function:

with the depression function of Figure 8a. It is noted that the frequency of the vibration oscillations is higher than that of the plate oscillations: (SO ).

In the example of Figures 7a and 8a, high plateaus (possibly with oscillations) and low plateaus are connected by S-curves. It is noted that similar curves could be obtained from sine-like functions (or even other portions of increasing and decreasing functions) instead of S-curves.

Using S-shaped curves as ascending and descending curves, the depression functions of Figures 6a, 7a and 8a can be modeled, over a period , by functions of the form:

For these depression functions a minimal parameter set that allows the curve to be fully characterized can include:

– the minimum value of depression;

– the maximum value of depression;

– the period or the frequency depression;

– the cycle ratio, which corresponds to the percentage of the complete period what the cumulative duration should represent of ascent and high plateau ;

– the transition parameter, corresponding to the percentage of the complete period what should the transition period represent? (i.e. the transition time between a high plateau and a low plateau or between a low plateau and a high plateau);

– the number of oscillations on the high plate; and

– the amplitude of the oscillation.

For example, the minimum value of depression can be a value between 0 and 660 mbar, and preferably between 0 and 120 mbar. In particular, the operator can select, via the user interface 4, the minimum value of depression from a set of selectable minimum values, for example values between 0 and 120 mbar, in steps of 30 mbar.

The maximum value of depression can be a value between 0 and 660 mbar, and preferably between 90 and 300 mbar. In particular, the operator can select, via the user interface 4, the maximum value of depression from a set of selectable maximum values, for example values between 90 and 300 mbar, in steps of 30 mbar.

The frequency can be between 0 Hz and 32 Hz, and preferably between 0.25 Hz and 16 Hz. In particular, the operator can select, via the user interface 4, a frequency value from a set of selectable frequencies, for example 0.25 Hz, 0.50 Hz, 0.75 Hz, 1 Hz, 2 Hz, 3 Hz, and all integer values up to 16 Hz.

The cycle report may be a number between 0% and 100%. In particular, the operator may select, via the user interface 4, a duty cycle value from a set of selectable values, for example 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90%.

The transition parameter can take, for example, integer values between 1 and 5 that the operator can select via the user interface 4, representing the number of tens of percent of the full period what is the transition duration .

The transition parameter controls the time allocated to each portion of the curve (increasing or decreasing) between a high plateau (i.e. a high depression) and a low plateau (i.e. a low depression). The higher the transition parameter, the shorter the total duration of a high plateau and a low plateau during a cycle (i.e. a period). In particular, if , there are no longer any high or low plateaus, and, if no oscillation is added on the high plateaus, we find a "pseudo-sinusoidal" curve (concatenation of increasing and decreasing portions of sigmoids), having a shape "similar" to that of Figure 5a. In the particular case where , the cycle ratio is 50%.

The number of oscillations on the top tray can be an integer between 0 and 10 that the operator can select via the user interface 4.

The amplitude of the oscillation can be a value between 0 mbar and . In particular, the operator can select, via the user interface 4, the value of the amplitude of the oscillation from a set of selectable values, for example the values between 0 mbar and in steps of 30 mbar.

Of course, all the above values are provided as examples and are in no way limiting of the invention.

It is understood that the previous set of parameters, although it allows the depression function to be completely characterized, is not unique. For example, as mentioned above, the transition parameter can be replaced by the duration of the transition, the cycle ratio can be replaced by the duration of a high plateau, the number of oscillations can be replaced by an oscillation frequency and the amplitude of the oscillation can be replaced by a percentage of the amplitude ( ) of the depression function. In fact, we have:

Another example of a depression function is shown in FIG. 9 .

The depression function shown in Figure 6d corresponds to a so-called "ramp" function, whose temporal variations over a period , with And two strictly positive real parameters, can be represented by:

This depression function corresponds to a piecewise affine function composed of a succession of connections between a portion of increasing straight line between a low depression and a high depression with a rise time and a portion of increasing straight line between a high depression and a low depression with a descent time .

There FIG. 9 represents the depression function of the FIG. 9 , to which a sinusoidal vibration has been added, i.e. the function:

with the depression function defined above.

Of course, the present invention is not limited to the embodiments described above as examples; it extends to other variants.

Claims (9)

Massage apparatus (10) comprising a massage head (1) and a control system (2), the massage head (1) being intended to be applied to the skin of a subject, in which the control system (2) is configured to control the massage head so that a depression is generated in the massage head (1) according to a depression function representing a temporal variation of the depression generated in the massage head, in which the control system (2) is further configured to add, to the depression function, a sinusoidal vibration of frequency between 25 Hz and 45 Hz. A massage apparatus (10) according to claim 1, wherein the sinusoidal vibration has an amplitude between 30 mbar and 70 mbar. Massage apparatus (10) according to claim 1 or 2, wherein the depression function is a constant function or a square wave function. A massage apparatus (10) according to claim 1 or 2, wherein the vacuum function is continuous, periodic and non-constant. A massage apparatus (10) according to claim 4, wherein the depression function is a piecewise affine function or a sinusoidal function. Massage apparatus (10) according to claim 4, wherein the depression function corresponds to a concatenation of at least two portions of at least two respective basic functions, the at least two basic functions being chosen from: constant functions, affine or piecewise affine functions, sinusoidal functions and sigmoid functions. Massage apparatus (10) according to one of the preceding claims, wherein the vacuum function has a period between 0 Hz and 20 Hz. Massage device (10) according to one of the preceding claims, wherein the control system comprises a suction device (22) connected to the massage head (1) by a suction duct (3) configured to generate suction, said suction generating a depression in the massage head (1). Cosmetic treatment method implemented by a massage device (10) comprising a massage head (1) and a control system (2), the massage head (1) being intended to be applied to the skin of a subject, the method comprising:

• controlling (370), by the control system, the massage head so that a depression is generated in the massage head according to a depression function representing a temporal variation of the depression generated in the massage head,

in which a sinusoidal vibration of frequency between 25 Hz and 45 Hz is added (360) to the depression function.