Skin impurity extraction head

Abstract

Skin impurity extraction head. A skin impurity extraction head (10) characterized in that it comprises: - a housing (16) defining an internal chamber (20), the internal chamber opening onto an aperture (17) intended to be applied against the skin, - a skin-pinching means (18) arranged at said aperture, and - a suction conduit (19) intended to be connected to a suction means (5) to create a vacuum at the aperture. Figure for the abbreviation: Figure 1

Description

Title of the invention: Skin impurity extraction head Technical field of the invention

[0001] The invention relates to the field of cosmetic skin treatment devices, in particular the field of devices intended to extract impurities from the skin, in particular blackheads or comedones. The invention also relates to a cosmetic treatment method with such an extraction device. State of the prior art

[0002] The skin of the human body, and in particular the skin of the face, sometimes contains impurities, such as comedones or blackheads, which it is desirable to remove or reduce. A method of extraction by pinching, in particular with the fingers, is known. However, this method can lead to local injury to the skin. In addition, it is unhygienic and is not always effective. In particular, the extraction of impurities in certain areas of the face such as the base of the nose or around the nostrils is particularly difficult.

[0003] Extraction methods based on the use of utensils such as blackhead removers are also known. Blackhead removers are also unhygienic and do not always allow impurities to be extracted effectively. Suction extraction devices are also known. For example, publication WO2016167496 discloses suction combined with positive pressure to extract a blackhead. In practice, such devices are not sufficiently effective. Presentation of the invention

[0004] The aim of the invention is to provide a device for extracting impurities from the skin which overcomes the above drawbacks and improves the devices known from the prior art.

[0005] More specifically, a first object of the invention is an extraction device which is both hygienic, making it possible to effectively extract impurities from the skin and limiting the traumatic impact on skin tissue. Summary of the invention

[0006] The invention relates to a head for extracting impurities from the skin, comprising: - a housing defining an internal chamber, the internal chamber opening onto an opening intended to be applied against the skin, - a skin pinching means arranged at said opening, and - a suction duct intended to be connected to a suction means to create a vacuum at the opening.

[0007] The housing may comprise at least one flexible wall bordering said opening, and the pinching means may be configured to vary at least one dimension of said opening.

[0008] Said dimension of the opening may be capable of varying between a first value of between 5 mm and 10 mm inclusive and a second value, strictly less than the first value, and of between 2 mm and 5 mm inclusive.

[0009] The flexible wall may be made of silicone.

[0010] The pinching means may comprise at least one movable element pivotally mounted relative to the housing, in particular at least two movable elements pivotally mounted relative to the housing, the at least one movable element comprising a first end configured to pinch the skin.

[0011] The first end of the at least one movable element may bear on the flexible wall to vary the at least one dimension of said opening.

[0012] The first end may comprise a metal blade.

[0013] The extraction head may comprise a removable filter arranged in the suction duct.

[0014] The housing may comprise a generally frustoconical outer shape.

[0015] The invention also relates to an apparatus for extracting impurities from the skin, comprising an extraction head as defined above and a handle provided with an electrical drive means cooperating with said pinching means to pinch the skin.

[0016] The handle may comprise a cam capable of being driven in rotation by the electric drive means, the cam cooperating with said pinching means to pinch the skin.

[0017] The handle may comprise a suction means connected to the suction duct of the extraction head.

[0018] The extraction head can be removably attached to the handle.

[0019] The extraction apparatus may be configured to pinch the skin at a given first frequency, in particular a frequency between 1 Hz and 5 Hz.

[0020] The invention also relates to a device for extracting impurities from the skin, comprising an extraction apparatus as defined above and a suction means connected to the suction duct of the extraction head.

[0021] The extraction device can be configured to vary a depression at the skin level according to a second given frequency, in particular a frequency between 1 Hz and 5 Hz.

[0022] The extraction device may comprise an extraction apparatus configured to pinch the skin according to the first given frequency, in particular a frequency between 1 Hz and 5 Hz, and the suction means may be synchronized with the electrical drive means, in particular the first frequency may be equal to the second frequency and / or the first frequency may be a multiple of the second frequency and / or the second frequency may be a multiple of the first frequency.

[0023] The invention also relates to a cosmetic treatment method, comprising: - contacting the opening of an extraction head as defined previously against the skin, then simultaneously - a pinching of the skin, and - the creation of a depression in the internal chamber of the extraction head. Presentation of figures

[0024] These objects, characteristics and advantages of the present invention will be explained in detail in the following description of a particular embodiment made without limitation in relation to the attached figures among which: [Fig.l] is a schematic view of an extraction device according to one embodiment of the invention, the extraction device comprising an extraction apparatus connected to a base provided with a suction means. [Fig.2] is a perspective view of a handle of the extraction apparatus. [Fig.3] is a front view of the handle. [Fig.4] is a perspective view of an extraction head of the extraction apparatus. [Fig.5] is a perspective view of a pinching means and a filter of the extraction head. [Fig.6] is a sectional view of the extraction apparatus with an opening of the extraction head in a constricted configuration. [Fig.7] is a sectional view of the extraction apparatus with the extraction head opening in an enlarged configuration. [Fig.8] is a diagram illustrating the kinematics of moving elements integrated into the extraction head. [Fig.9] is a graph illustrating the temporal evolution of the depression within an internal chamber of the extraction head during a treatment method according to an embodiment of the invention. Detailed description

[0025] [Fig.l] schematically illustrates an extraction device 1 according to one embodiment of the invention. The extraction device 1 is intended to mechanically extract impurities from the skin, in particular blackheads, more generally called comedones. These impurities block certain pores of the skin, at the level of a superficial layer of the skin, generally at the level of the epidermis. The extraction device therefore aims to bring out, at least partially, these impurities from the skin. The extraction device is preferably intended to treat the face but can also suitable for treating any other part of the human body.

[0026] According to the embodiment shown in [Fig.l], the extraction device 1 comprises an extraction apparatus 2 and a remote station 3, connected to the extraction apparatus 2. The station 3 may in particular comprise a suction means 5 and / or an electrical energy source 6 connected to the extraction apparatus 2 respectively by a conduit 7 and an electrical cable 8. The extraction apparatus 2 is a device that can be handled by hand. It is intended to be handled by a user to treat impurities on his skin or by a person responsible for applying aesthetic care to the skin of a patient.

[0027] The integration of the suction means 5 and / or the electrical energy source 6 in the station 3 makes it possible in particular to make the extraction device 2 lighter and more compact, which makes it easier to handle. In addition, the station 3 may possibly be configured to be connected to other skin treatment devices or tools, which makes it possible to share the suction means 5 and / or the electrical energy source 6. The extraction device 1 can thus be used for a whole range of aesthetic treatments, including the extraction of impurities from the skin. The station 3 may be intended to be connected to an electricity distribution network. It may be movable, in particular by means of casters.

[0028] According to an alternative embodiment of the invention, the suction means 5 and / or the electrical energy source 6 could be integrated into the extraction apparatus 2 so that they can be used wirelessly. In this case, the electrical energy source 6 can advantageously be a battery, in particular a rechargeable battery, integrated into the extraction apparatus 2.

[0029] The extraction apparatus 2 comprises an extraction head 10 and a handle 11. The handle 11, particularly illustrated in [Fig. 2], comprises a generally elongated shape so as to be grasped by one hand. The extraction head 10 is fixed to one end of this handle 11. Advantageously, the extraction head 10 is removably fixed to the handle, which makes it possible to envisage the fixing of other treatment heads on this same handle, in order to apply other skin treatments. For this purpose, the handle comprises a snap-on fixing interface 12.

[0030] Advantageously, the handle 11 also comprises pneumatic and electrical connection means to which the conduit 7 and the electric cable 8 are respectively connected. In addition, the handle 11 comprises an electrical drive means 13, in particular an electric motor. The electrical drive means 13 has an output shaft 14 to which a cam 15 is fixed (better visible in [Fig. 3]). The cam 15 is rotatably mounted about an axis of rotation A1 corresponding to the axis in which the handle 11 extends. As we will see later, the cam 15 drives a skin pinching means 18 which is integrated into the extraction head 10. The cam 15 may have a generally ellipsoidal shape, that is to say with two opposite lobes arranged on its circumference. For example, the small diameter DI of the cam 15 may be between 15 mm and 20 mm inclusive. The largest diameter D2 of the cam 15 may be strictly greater than the small diameter DI and between 20 mm and 30 mm inclusive. Alternatively, the dimensions and / or the number of lobes could be different, for example a single lobe, three lobes or even more lobes. Advantageously, the cam 15 may take the form of a groove or an undulating groove.

[0031] The extraction head 10 is illustrated in more detail in Figures 4 and 5. The extraction head 10 comprises a housing 16 provided with an opening 17 intended to be applied against the skin, the pinching means 18 arranged at the opening 17, and a suction conduit 19.

[0032] The housing 16 defines an internal chamber 20 which opens onto the opening 17. The internal chamber 20 communicates with the suction duct 19 which is connected to the suction means 5. The opening 17 has dimensions such that all of its edges can come into contact with the skin. Advantageously, the edges of the opening can extend in a plane. Thus, when the opening is applied to the skin, all of the edges of the opening are in contact with the skin, which forms an airtight seal. It is then possible to form a depression in the internal chamber 20, which causes local suction of the skin, at the level of an area inscribed in the opening 17. Air can thus be sucked through the opening 17 when the latter is not applied against the skin.

[0033] According to one embodiment of the invention, the housing 16 comprises a rigid part 21 intended to be snapped onto the handle 11 and a more flexible part 22 in which the opening 17 is formed. The opening 17 is thus bordered by a flexible wall. Consequently, the opening 17 is a deformable opening. The flexible nature of the edges of the opening 17 allows the variation of at least one of the dimensions of the opening. This also makes it possible to form an airtight interface between the housing and the skin, regardless of the geometry of the skin, in particular when the skin forms a rounded surface such as in the area of ​​the forehead, chin, cheekbones or nose.

[0034] The housing 16 is advantageously made of two different materials. The flexible part 22 may for example be made of silicone, or alternatively of any other sufficiently flexible material such as an elastomer or rubber. The rigid part 21 may be made of a more rigid plastic material or of metal, so as to integrate therein a fixing interface with the handle 11. The flexible part and the rigid part of the housing may be fixed together for example by gluing or by welding. The housing may also be produced by an injection manufacturing process. bi-material such as overmolding or co-injection. The thickness of the flexible wall may be, for example, between 1 mm and 5 mm. Alternatively, the housing 16 could comprise only the flexible part. In this case, the means for fixing the extraction head 10 to the handle 11 would be adapted accordingly.

[0035] Advantageously, the housing 16 comprises a generally frustoconical external shape, at least at the end in which the opening 17 is provided. A frustoconical shape designates in the broad sense any shape whose section parallel to the plane in which the opening 17 extends increases as this section moves away from the opening 17. Consequently, the extraction head 10 is thinner at the end in which the opening 17 is formed than at its attachment interface with the handle 11. This frustoconical shape makes it possible to access the most difficult areas of the face, such as for example the base of the nose or the nostrils.

[0036] The opening 17 can therefore be deformed between at least two distinct shapes. This makes it possible to pinch the skin around the impurity to be treated. In [Fig. 4] a first line L1 in solid lines represents the shape of the opening 17 in a first configuration, called the widened configuration. In this first configuration, the opening 17 can have any convex shape, in particular a generally ovoid or circular shape. A second line L2 in dotted lines represents the opening 17 in a second configuration, called the narrowed configuration. In this second configuration, two opposite edges of the opening come together to form rounded portions oriented towards the center of the opening. In other words, the shape of the opening 17 in this second configuration is concave. The dimension D3 of the opening 17 thus varies between a first value and a second value strictly less than the first value.When the opening 17 is in its first configuration, the dimension D3 may be, for example, between 5 mm and 10 mm inclusive. When the opening 17 is in its second configuration, the dimension D3 may be, for example, between 2 mm and 5 mm inclusive. Such dimensions are particularly suitable for effectively extracting comedones from the skin, or at least initiating their extraction from the skin. As a note, other dimensions of the opening 17 may remain generally unchanged between the first and second configurations. Thus, the dimension D4, measured along an axis perpendicular to the dimension D3, may be at least roughly unchanged between the first and second configurations of the opening. Alternatively, the dimension D4 of the opening could also vary between the first and second configurations.Generally speaking, the surface area of ​​the opening in its first configuration is preferably strictly greater than the surface area of ​​the opening in its second configuration. As a note, the shapes of the opening 17 in a narrowed or widened configuration could. be freely adapted, in particular to treat specific areas of the human body, including specific areas of the face. The extraction device can thus be supplied with various removable extraction heads, suitable for different areas to be treated.

[0037] The pinching means 18 is configured to vary at least one dimension of the opening 17. Reducing the dimension D3 of the opening 17 therefore produces a pinching of the skin. In particular, the pinching means 18 comprises a mechanical member making it possible to vary the dimension D3 of the opening 17. More precisely, it comprises at least one movable element, or valve, pivotally mounted relative to the housing 16. According to the embodiment presented, the pinching means 18 comprises two movable elements integrated into flexible walls of the housing, diametrically opposed. Alternatively, the pinching means 18 could comprise a different number of movable elements, for example a single movable element or more than two movable elements. For example, a pinching of the skin could also be obtained with a single movable element pinching the skin against a wall of the housing 16. The movable elements are generally elongated elements.They are pivotally mounted relative to the housing along an axis A2 perpendicular to the axis of rotation Al of the cam 15. For this purpose, each movable element comprises two lugs 23 extending parallel to the axis A2 and cooperating with complementary shaped recesses provided in the housing 16. Each movable element further comprises a first end 24 in contact with the flexible wall. This first end 24 may be, for example, a metal blade. This metal blade may be, for example, overmolded or inserted into a plastic body of the movable element. Alternatively, the entire movable element could be made of metal. This first end 24 may be embedded in the thickness of the flexible wall or extend against the flexible wall. Generally speaking, the first end bears against the flexible wall so as to transmit to it the forces necessary to deform it.It may have a length of the order of several millimeters, or even several centimeters in the direction in which the movable element extends. Advantageously, this first end 24 is both sufficiently rigid to transmit the forces making it possible to deform the opening 17 and pinch the skin and sufficiently thin not to significantly increase the thickness of the walls bordering the opening. Thus, the extraction head makes it possible to reach all areas of the face, even those which are the most difficult to access. Finally, each movable element comprises a second end 25, opposite the first end 24, and cooperating with the cam 15. This second end 25 may for example comprise a sphere bearing on the cam 15. Advantageously, and as can be seen in FIGS. 6 and 7, the handle 11 comprises a groove 28 arranged at the periphery of the cam and in which the two spheres. can take place. The groove 28 thus forms a cam path. The two lugs 23 are positioned substantially towards the middle of each movable element, between the first end 24 and the second end 25, at the opposite end of the movable element.

[0038] [Fig. 6] schematically illustrates the movement of the movable elements between the two configurations, narrowed and widened, of the opening 17. The solid lines represent the direction in which the movable element extends when the extraction head is in the narrowed configuration. The dotted lines represent the direction in which the movable element extends when the extraction head is in the widened configuration. It is therefore understood that the kinematics of the movable elements can be easily adapted by adjusting the shape of the cam, in particular the dimensions DI and D2 of the cam, and / or by adjusting the position of the pivot point formed by the lugs 23, and / or by adjusting the length of the movable elements. It is thus possible to obtain a more or less significant pinching effect.Advantageously, the extraction device may be provided in the form of a kit comprising several heads and / or several cams in order to offer the user the possibility of adjusting the pinching effect obtained. When the cam rotates around the rotation axis A1 at a given speed, the moving elements pivot around the axis A2 which causes a variation of the dimension D3 of the opening 17 according to a first given frequency. Advantageously, the number of lobes of the cam and / or the rotation speed of the motor may be adapted so as to obtain a frequency of between 1 Hz and 5 Hz.

[0039] According to an alternative embodiment not shown, the variation of at least one dimension of the opening 17 could be obtained differently. For example, the extraction head could integrate: - a diaphragm, and / or - inflatable and deflatable areas, and / or - electromagnetic elements whose power of attraction or repulsion could be modulated by an electric current, - piezoelectric means. The variation of at least one dimension of the opening could even be obtained or amplified by the action of a depression generated by the suction means on the flexible walls of the extraction head. According to another alternative embodiment, the pinching means 18 could be dissociated from the walls bordering the opening 17. It could for example be arranged inside the internal chamber 20. In particular, the mobile elements could be mounted mobile inside the internal chamber 20 and produce a pinching of the skin without deformation of the opening 17.

[0040] The suction duct 19 is intended to be connected to the suction means 5 to create a vacuum at the opening 17. The suction duct 19 therefore passes through the extraction head 10 and is extended by a second suction duct 26 provided in the handle 11. The second suction duct 26 is connected to the suction means 5 via the duct 7. The suction duct 19 can be arranged inside the housing 16 and extend parallel to the axis of rotation AL. Alternatively, the suction duct 19 could be formed directly by the walls of the housing 16. The second suction duct 26 can, for example, pass through a central zone of the cam 15. It is therefore understood that the extraction head comprises a first opening intended to be applied against the skin (this first opening corresponding to the opening 17) and a second opening opposite the second suction duct 26 integrated in the handle 11. Alternatively, the suction duct 19 could be connected directly to the suction means 5, without passing through the handle 11.

[0041] The suction means 5 may comprise, for example, a vacuum pump and / or a turbine. The vacuum level is sufficiently high to extract impurities while being sufficiently low to avoid the formation of bruises or hickeys. For example, the vacuum produced by the suction means 5 may be between 10 kPa and 40 kPa, and preferably between 20 and 30 kPa relative to atmospheric pressure.

[0042] Advantageously, the extraction head 10 comprises a removable filter 27 arranged in the suction duct 19. The filter 27 advantageously comprises a casing facilitating its handling and its integration in the suction duct 19. The filter makes it possible to collect the impurities extracted from the skin and to prevent them from contaminating the suction means 5. Advantageously, the filter 27 is designed to be single-use. It can, for example, be manufactured with materials with low environmental impact, in particular biodegradable materials.

[0043] Preferably, the extraction device is configured to vary a depression at the skin level according to a second given frequency. This can be achieved by directly controlling the suction means, or alternatively by providing a suction means producing a constant depression and means such as valves or valves configured to cyclically interrupt this suction. Such valves or valves can for example be integrated into the extraction head 10. They can also be actuated by the pinching means 18.

[0044] [Fig. 9] illustrates an example of the variation of the depression (on the ordinate) as a function of time (on the abscissa) within the internal chamber 20. Suction phases in which the surface of the skin is under depression alternate with non-suction phases in which the surface of the skin is at ambient pressure. The duration of these two phases may be substantially identical. Advantageously, the extraction device is configured so as to generate abrupt transitions between the non-suction phases and the suction phases, so as to accentuate the capacity extraction of impurities. Advantageously, the pressure variation within the internal chamber can be approximately 40kPa in a time period of between 0.5s and 2s during the transition between the non-suction phases and the suction phases.

[0045] An advantage of varying the depression level cyclically is that it is thus possible to achieve greater depression values ​​without causing bruising. Indeed, the high depressions are only applied to the skin for a short time. This preserves the skin while allowing sufficient extraction of impurities. In addition, the ambient pressure phases allow the extraction head to be moved freely over the surface of the skin without exerting stress on the skin.

[0046] Advantageously, the suction means 5 can be synchronized with the electrical drive means 13. In particular, the first frequency can be equal to the second frequency. The extraction device can thus be configured so that the pinching of the skin is carried out at the same time as the depression phase. When the skin is sucked through the opening, it forms a fold which is easier to pinch than a flat surface. In addition, the formation of a fold makes it possible to open the pores of the skin, which allows impurities to come out more freely. This provides a synergistic effect between the pinching and the suction which further amplifies the power of extracting impurities.

[0047] Alternatively, the first frequency may be a multiple of the second frequency, i.e., more skin pinches than suction phases occur per unit of time. However, each time a skin suction phase occurs, a pinch is performed simultaneously. According to another alternative, the second frequency is a multiple of the first frequency, i.e., more skin suction phases occur than pinch phases per unit of time. However, each time a skin pinch occurs, a suction phase is performed simultaneously.

[0048] The assembly of the extraction head 10 to the handle 11 is particularly simple to carry out since this can be obtained by a simple translational movement of the extraction head relative to the handle along the axis AL. Depending on the position taken by the spheres arranged at the second ends 25 of the movable elements, a correct orientation of the extraction head relative to the cam may be necessary for this assembly operation. Advantageously, the groove 28 in which the spheres are positioned comprises ramps 29 which facilitate the assembly of the extraction head regardless of its orientation relative to the cam around the axis AL.

[0049] The extraction device can thus be used in a therapeutic treatment method peutic or, on the contrary, in a non-therapeutic treatment process such as a cosmetic skin treatment. The cosmetic skin treatment aims to cleanse the skin of its impurities in order to give it a clean and pure appearance. The treatment of the skin using the extraction device 1 can thus be described as a skin cleansing process. It can be implemented in a beauty treatment practice or in a beauty salon. Alternatively, it can also be implemented personally by a user to treat their own skin at home. This non-invasive process aims to cleanse the epidermis of its impurities, or at least to prepare the epidermis for future extraction of impurities. According to one embodiment, the process comprises: - contacting the opening 17 with the extraction head 10 against the skin, then simultaneously - a pinching of the skin, and - the creation of a vacuum in the internal chamber 20 of the extraction head. Advantageously, the pinching of the skin and the vacuum are carried out simultaneously. The dual action of pinching and suction promotes the extraction of impurities. The extraction apparatus 2 and the extraction head 10 are therefore configured to implement such a method.

[0050] The treatment method may optionally include other complementary steps. In particular, in the event that the impurities are not completely extracted from the face at the end of the previous steps, the extraction method may be supplemented by steps during which different products are applied to the skin and / or during which an additional mechanical treatment of the skin is carried out.

[0051] Thanks to the invention, a skin extraction device is provided which makes it possible to effectively extract skin impurities such as comedones or blackheads. This extraction device is also hygienic and protects the skin from the risk of excessive pinching or the appearance of a bruise. In addition, the extraction device makes it possible to treat impurities in all parts of the face, including those which are difficult to access.

Claims

Claims

1. Extraction head (10) for impurities from the skin, characterized in that it comprises: - a housing (16) defining an internal chamber (20), the internal chamber opening onto an opening (17) intended to be applied against the skin, the opening (17) having dimensions such that all of its edges can come into contact with the skin, - a skin pinching means (18) arranged at the level of said opening, and - a suction duct (19) intended to be connected to a suction means (5) to create a vacuum at the level of the opening.

2. Extraction head (10) according to the preceding claim, characterized in that the housing (16) comprises at least one flexible wall bordering said opening (17), and in that the pinching means (18) is configured to vary at least one dimension (D3) of said opening.

3. Extraction head (10) according to the preceding claim, characterized in that the flexible wall is made of silicone.

4. Extraction head (10) according to one of the preceding claims, characterized in that the pinching means (18) comprises at least one movable element pivotally mounted relative to the housing (16), in particular at least two movable elements pivotally mounted relative to the housing (16), the at least one movable element comprising a first end (24) configured to pinch the skin.

5. Extraction head (10) according to the preceding claim and according to one of claims 2 to 4, characterized in that the first end (24) of the at least one movable element bears on the flexible wall to vary the at least one dimension (D3) of said opening (17).

6. Extraction head (10) according to one of the preceding claims, characterized in that it comprises a removable filter (27) arranged in the suction duct (19).

7. Apparatus (2) for extracting impurities from the skin, characterized in that it comprises an extraction head (10) according to one of the preceding claims and a handle (11) provided with an electric drive means (13) cooperating with said pinching means (18) to pinch the skin.

8. Extraction apparatus (2) according to the preceding claim, characterized in that the handle (11) comprises a cam (15) capable of being driven rotating by the electric drive means (13), the cam cooperating with said pinching means (18) to pinch the skin.

9. Extraction apparatus (2) according to one of claims 7 or 8, characterized in that it is configured to pinch the skin according to a first given frequency, in particular a frequency between 1Hz and 5Hz.

10. Device (1) for extracting impurities from the skin, characterized in that it comprises an extraction apparatus (2) according to one of claims 7 to 9 and a suction means (5) connected to the suction duct (19) of the extraction head (10).

11. Extraction device (1) according to the preceding claim, characterized in that it is configured to vary a depression at the level of the skin according to a second given frequency, in particular a frequency between 1Hz and 5Hz.

12. Extraction device (1) according to the preceding claim, characterized in that it comprises an extraction apparatus (2) according to claim 9, and in that the suction means (5) is synchronized with the electrical drive means (13), in particular in that the first frequency is equal to the second frequency and / or the first frequency is a multiple of the second frequency and / or the second frequency is a multiple of the first frequency.

13. Cosmetic treatment method, characterized in that it comprises: - bringing the opening (17) of an extraction head (10) according to one of claims 1 to 6 into contact with the skin, then simultaneously - pinching the skin, and - creating a depression in the internal chamber (20) of the extraction head.

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