Cold plasma device for treating skin

Abstract

The present application relates to a cold plasma device (1) for treating skin (5). The cold plasma device (1) comprises a cold plasma generator (3) adapted to generate cold plasma that produces reactive species for treating said skin (5), and a manipulator (10) adapted to manipulate said skin (5) to increase exposure of bacteria on said skin to said reactive species during use of the device.

Claims

1. A cold plasma device for treating skin, the cold plasma device comprising: a housing having an end face, a cold plasma generator adapted to generate cold plasma that produces reactive species for treating said skin, wherein the cold plasma generator is substantially evenly spaced from said skin during use, and a manipulator connected or coupled to the end face of the housing and adapted to manipulate said skin to increase exposure of bacteria on said skin to said reactive species during use of the device, wherein said manipulator extends between the cold plasma generator and the said skin during use; wherein the manipulator comprises a movable member movable relative to the manipulator, said movable member arranged to contact said skin to be treated during use of the cold plasma device.

2. The cold plasma device of claim 1, further comprising an actuator adapted to move the movable member relative to the remainder of the cold plasma device.

3. The cold plasma device of claim 1, wherein the manipulator comprises a stretcher member.

4. The cold plasma device of claim 3, wherein the stretcher member is pivotally mounted to the cold plasma device.

5. The cold plasma device of claim 3, wherein the manipulator comprises a plurality of stretcher members arranged in adjacent lines.

6. The cold plasma device of claim 5, wherein a distance between the plurality of stretcher members are greater than a length of the stretcher members.

7. The cold plasma device of claim 3, further comprising an actuator adapted to rotate the stretcher member.

8. The cold plasma device of claim 1, wherein the manipulator is cylindrical and is adapted to be rolled across said skin.

9. The cold plasma device of claim 1, wherein the manipulator is spherical and is adapted to be rolled across said skin.

10. The cold plasma device according to claim 1, wherein the manipulator comprises a fixed member arranged to contact said skin during use of the device.

11. The cold plasma device of claim 1, wherein the manipulator comprises a mesh.

12. The cold plasma device of claim 1, wherein the manipulator comprises a plurality of protrusions adapted to contact said skin during use of the cold plasma device.

13. The cold plasma device of claim 1, wherein the manipulator comprises a resiliently flexible material, and the manipulator is adapted to the shape of the skin being treated.

14. The cold plasma device of claim 1, wherein the cold plasma generator and the manipulator are integrally formed, with the manipulator being disposed on a surface of the cold plasma generator.

15. The cold plasma device of claim 1, wherein the manipulator is configured to smooth out wrinkles.

16. The cold plasma device of claim 1, further comprising an actuator adapted to cause the movable member to vibrate relative to the device.

17. The cold plasma device of claim 1, further comprising a belt adapted to contact the skin, wherein the belt is mounted on at least two rollers, wherein an actuator is adapted to rotate the belt.

18. The cold plasma device of claim 1, wherein the cold plasma generator comprises a first electrode and a second electrode that are embedded within a dielectric material, wherein a surface of the dielectric material comprises the manipulator.

19. The cold plasma device of claim 18, wherein the second electrode comprises openings configured to permit reactive species of cold plasma filaments to reach the skin during use of the device.

20. The cold plasma device of claim 1, wherein the manipulator comprises a ring-shaped plate, the plate comprising a plurality of protrusions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

(2) FIG. 1 shows an example cold plasma device for treating skin;

(3) FIG. 2a shows a perspective view of an example cold plasma device for treating skin;

(4) FIG. 2b shows an exploded view of the cold plasma device of FIG. 2a;

(5) FIG. 3 shows the manipulator of the cold plasma device of FIG. 2a and FIG.

(6) 2b;

(7) FIG. 4a shows a schematic diagram of an example of a cold plasma device for treating skin;

(8) FIG. 4b shows an enlarged view of a part of the manipulator of the cold plasma device of FIG. 4a;

(9) FIG. 5a shows a schematic diagram of an example of a cold plasma device for treating skin;

(10) FIG. 5b shows an enlarged view of a part of the manipulator of the cold plasma device of FIG. 5a;

(11) FIGS. 6a to 6c show examples of manipulators for a cold plasma device for treating skin;

(12) FIGS. 7a to 7d show an example of a cold plasma device for treating skin, the cold plasma device including a manipulator having stretcher members;

(13) FIG. 8 shows a schematic diagram of an example stretcher member;

(14) FIG. 9 shows a schematic diagram of another example stretcher member;

(15) FIGS. 10a to 10c show schematic diagrams of example rotatable stretcher members;

(16) FIG. 11 shows an example of a line of stretcher members;

(17) FIG. 12a and FIG. 12b show views of an example cold plasma device for treating skin, having a manipulator comprising cylindrical rollers;

(18) FIGS. 13a to 13c show views of an example cold plasma device for treating skin, having a manipulator comprising belts;

(19) FIG. 14a and FIG. 14b show an example of a cold plasma device for treating skin, having a spherical manipulator;

(20) FIG. 15 shows an example of a cold plasma device for treating skin, having a cylindrical manipulator;

(21) FIG. 16 shows an example cold plasma generator;

(22) FIG. 17 shows another example cold plasma generator with an integrated manipulator;

(23) FIG. 18 shows another example cold plasma generator with an integrated manipulator; and,

(24) FIG. 19 shows another example cold plasma generator with an integrated manipulator.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(25) The example cold plasma device 1 shown in FIG. 1 comprises a housing 2 that holds a cold plasma generator 3.

(26) The term cold plasma is used to describe plasmas at an ion temperature that is less than about 100 degrees Celsius, and is therefore suitable for use on and around people, particularly for treating skin.

(27) The cold plasma generator 3 of the example of FIG. 1 comprises a first electrode 6, a second electrode 7, and a dielectric material 8 disposed between the first and second electrodes 6, 7. As shown in FIG. 1, the cold plasma generator 3 extends across the housing 2 so that it is substantially parallel with an end face 9 of the housing 2. In this way, the cold plasma generator 3, particularly the second electrode 7 (which is closer to the skin 5), is substantially evenly spaced from the skin 5 during use.

(28) The cold plasma generator 3 is connected to a power supply (not shown) within the device 1 such that a voltage is generated across the first and second electrodes 6, 7. The dielectric material 8 acts to electrically insulate the first electrode 6 from the second electrode 7.

(29) The above-described structure of the cold plasma generator 3 is termed a dielectric barrier discharge cold plasma generator. A pulsating direct current, or alternating voltage, with amplitude of several kilovolts is applied across the first electrode 6 and the second electrode 7. The dielectric material 8 prevents direct discharge between the first electrode 6 and the second electrode 7. Instead, filaments (micro-discharges) are generated between the dielectric material 8 and the second electrode 7. These filaments are created by the ionisation of molecules present between the first and second electrodes 6, 7, for example nitrogen molecules within the air, caused by the high voltage. This ionisation process releases electrons which collide with, and ionise, other molecules, such as radicals, present between the first and second electrodes 6, 7. These further molecules may collide with other molecules, resulting in a cascading effect generating the reactive species.

(30) In this way, reactive species are generated from the air between the second electrode 7 and the dielectric material 8. Amongst others, the reactive species may include nitrogen oxides, atomic oxygen, Ozone, hydroxyl, reactive oxygen species, reactive nitrogen species, and free electrons. The reactive species may be charged (e.g. ions or free electrons) or non-charged. These reactive species are chemically reactive and can inactivate bacteria, and are thus useful for treating surfaces such as skin.

(31) The ion temperature of the cold plasma is the temperature of the ions and the neutral molecules after being thermalized, i.e. once they have reached thermal equilibrium. In the treatment of skin, the temperature rise may be limited to a few degrees Celsius above ambient temperature. However, for treating other surfaces a higher voltage can be used to generate a higher temperature above ambient temperature, for example up to 100 degrees Celsius.

(32) The skilled person will appreciate that the cold plasma generator 3 may have an alternative structure. For example, US20140147333 describes two alternative arrangements of cold plasma generators. A first example is a surface micro discharge cold plasma generator in which the dielectric material fills the entire space between the first and second electrodes. Another example is a self-sterilizing surface cold plasma generator, in which the first and second electrodes are embedded in dielectric material, and so the filaments are emitted from a surface of the dielectric material.

(33) Moreover, the skilled person will appreciate that cold plasma can be generated within a gas that is not air. For example, other gasses can be provided to the space between the dielectric material and the second electrode, and these gasses would be ionised by the cold plasma generator and create reactive species. Such other gasses could be provided from a compressed gas source. For example, a cold plasma can be generated from a mixture of Argon gas and Oxygen. It is possible to control the type and quantity of reactive species generated by selecting different gasses.

(34) The cold plasma device 1 of FIG. 2a and FIG. 2b comprises a housing 2 that houses a cold plasma generator 3, a power supply (not shown) and other components of the device 1.

(35) The power supply may comprise a replaceable battery, a rechargeable battery, or a connection to an external power source (e.g. mains electricity). The power source may include other appropriate electrical components (e.g. transformer) to provide suitable electrical power to the cold plasma generator 3.

(36) In addition, the device 1 of FIG. 2a and FIG. 2b comprises a manipulator 10 adapted to manipulate the skin (5, see FIG. 1) to increase exposure of bacteria on the skin (5, see FIG. 1) to reactive species generated by the cold plasma generator 3 during use of the device 1.

(37) As shown in FIG. 2a and FIG. 2b, the device 1 includes a support 11 for the manipulator 10. The manipulator 10 is mounted within the support 11 and the support 11 is attached to the housing 2. Alternatively, the manipulator may be mounted directly to the housing 2.

(38) In some examples, the support 11 and manipulator 10 may be removable from the device 1 so that a user is able to select different attachments for different uses of the device 1. For examples, people have different sized armpits, and so various sized supports 11 could be supplied to allow the device 1 to be used by different people or used for a different area of skin.

(39) As shown in FIG. 3, the manipulator 10 of this example comprises a mesh 12. The mesh 12 comprises a series of struts 14 that define a plurality of openings 13 through which the reactive species of the cold plasma can travel to reach the skin (5, see FIG. 1) during use of the device 1.

(40) When the device 1 is in use the manipulator 10 is placed against the skin (5, see FIG. 1) and moved across the skin (5, see FIG. 1), while at the same time the cold plasma generator 3 generates the reactive species for treating the skin (5, see FIG. 1). In addition, the manipulator 10 contacts the skin (5, see FIG. 1) and so defines the minimum spacing between the cold plasma generator 3 and the skin (5, see FIG. 1) during use of the device 1.

(41) As the manipulator 10 is moved across the skin (5, see FIG. 1) it acts to manipulate the skin (5, see FIG. 1) in such a way that bacteria on the skin (5, see FIG. 1) is more exposed to the reactive species of the cold plasma. In particular, the manipulator 10 acts to stretch the skin (5, see FIG. 1) so that folds and wrinkles are leveled out and cavities exposed, while also providing a scraping action that may move or remove parts of the skin to expose cavities or crevices. Such manipulation may also lift or move hairs on the skin, thus exposing bacteria underneath the hairs to the reactive species.

(42) For example, the manipulator 10 acts to stretch and scrape the skin so that cavities defined by hair follicles, sebaceous glands, sweat glands, wrinkles, and even layers of corneocyte, are exposed, resulting in higher exposure of bacteria on the skin to the reactive species.

(43) In the example cold plasma device 1 of FIG. 4a and FIG. 4b, the first electrode 6 and dielectric material 8 of the cold plasma generator are arranged similarly to as explained with reference to FIG. 1. However, in this example the second electrode 7 and the manipulator 10 are part of the same component.

(44) In particular, as shown more clearly in FIG. 4b, the second electrode 7 comprises a mesh with struts 15 that define a plurality of openings 16. Attached to, or integral with, the struts 15 of the second electrode 7 is the manipulator 10. The openings 16 permit the reactive species generated in the space between the dielectric material 8 and the second electrode 7 to reach the skin (5, see FIG. 1).

(45) In this example, the manipulator 10 comprises a plurality of protrusions 17 mounted to the struts 15 of the manipulator 10. The protrusions 17 are pointed such that they engage the skin (5, see FIG. 1) and act to stretch and scrape the skin (5, see FIG. 1) as the cold plasma device 1 is moved across the skin (5, see FIG. 1). The protrusions 17 may be integral with, or attached to, the second electrode 7.

(46) In one example, the protrusions 17 are elongate and extend along the struts 15 of the mesh. In another example, each strut 15 includes a plurality of individual protrusions 17.

(47) The protrusions 17 may be rigid, or they may be resiliently deformable for example made from a rubber material. In some examples, the protrusions 17 may be bristles, or groups of bristles.

(48) In the example of FIG. 5a and FIG. 5b, the manipulator 10 is separate to, and spaced from, the second electrode 7. In this example, the second electrode 7 comprises a mesh that allows reactive species generated in the space between the dielectric material 8 and the second electrode 7 to reach the skin (5, see FIG. 1) during use.

(49) The manipulator 10 also comprises a mesh, with struts 14 and openings 13 that permit the reactive species to reach the skin (5, see FIG. 1) during use of the device 1. The struts 14 of the manipulator 10 include protrusions 17 that may be attached to, or integral with, the struts 14.

(50) The protrusions 17 are pointed such that they engage the skin (5, see FIG. 1) and act to stretch and scrape the skin (5, see FIG. 1) as the cold plasma device 1 is moved across the skin (5, see FIG. 1).

(51) In one example, the protrusions 17 are elongate and extend along the struts 14 of the mesh. In another example, each strut 14 may include a plurality of individual protrusions 17.

(52) The protrusions 17 may be rigid, or they may be resiliently deformable for example made from a rubber material. In some examples, the protrusions 17 may be bristles, or groups of bristles.

(53) In the examples of FIG. 6a to FIG. 6c the manipulator 10 comprises one or more openings 18.

(54) In the example of FIG. 6a, the manipulator 10 comprises a plate 19 that includes a plurality of openings 18. A plurality of protrusions 17 are disposed on the plate 19. The protrusions 17 may be integral with, or mounted to, the plate 19. The openings permit reactive species of the cold plasma to reach the skin (5, see FIG. 1) during use of the device. In the example of FIG. 6a, the openings 18 are circular and spaced from each other in the plate 19.

(55) In the example of FIG. 6b, the manipulator comprises a plurality of plates 19, each defining a segment of the manipulator 10. Between each plate 19 is an opening 18 to permit reactive species of the cold plasma to reach the skin (5, see FIG. 1) during use of the device. Similarly to the example of FIG. 6a, the plates 19 may comprise a plurality of protrusions that act to manipulate the skin (5, see FIG. 1). The protrusions may be integral with, or mounted to, the plates 19.

(56) In the example of FIG. 6c, the manipulator 10 comprises a ring-shaped plate 19 defining a single, circular opening 18 therein. The plate 19 may comprise a plurality of protrusions that act to manipulate the skin (5, see FIG. 1). The protrusions may be integral with, or mounted to, the plates 19.

(57) It will be appreciated that the manipulator 10 may take a variety of other shapes.

(58) As indicated by arrow 20 in FIG. 6a, the cold plasma device 1 may include an actuator (not shown) adapted to move the manipulator 10 relative to the remainder of the cold plasma device 1.

(59) In this example, the actuator is adapted to rotate the manipulator 10. In particular, the actuator is adapted to alternate the direction of rotation of the manipulator 10. In other examples, the actuator may be adapted to move the manipulator 10 in a linear direction, which may be alternated. In other examples, the actuator may be adapted to vibrate the manipulator 10.

(60) In the example illustrated in FIG. 7a to FIG. 7d, the cold plasma device 1 includes a manipulator 10 that comprises a plurality of stretcher members 21, in this example three stretcher members 21. The stretcher members 21 are adapted to contact the skin (5, see FIG. 1) during use.

(61) As shown in FIG. 7b, the stretcher members 21 are elongate and extend across the device 1 in parallel to each other. The reactive species of the cold plasma can pass between the stretcher members 21 to reach the skin 5 during use.

(62) As shown in FIG. 7c and FIG. 7d, when the device 1 is moved in the direction of arrows 22, 23 across the skin 5, the stretcher members are folded back in an opposite direction. In particular, the stretcher members 21 may be pivotally mounted to the manipulator 10. In this case, the stretcher members 21 may comprise a rigid material.

(63) In other examples, the stretcher members 21 may comprise a resiliently deformable material such that they deform during use.

(64) The deforming of the stretcher members 21 causes the skin to be stretched and scraped to provide manipulation and increase exposure of bacteria on the skin 5 to the reactive species of the cold plasma.

(65) FIG. 8 and FIG. 9 show different examples of the stretcher members 21 of FIGS. 7a to 7d.

(66) In particular, FIG. 8 shows stretcher members 21 with a triangular cross-section that is mounted on pivot 24. The stretcher member 21 rotates about pivot 24 as the cold plasma device is moved across the skin 5 in the direction of arrows 22, 23.

(67) In the example of FIG. 9, the stretcher members 21 have a partly cylindrical cross-section and are mounted on a pivot 24. The stretcher member 21 rotates about pivot 24 as the cold plasma device is moved across the skin 5 in the direction of arrows 22, 23.

(68) In both examples of FIG. 8 and FIG. 9, the stretcher members 21 are provided with a stop 25 that limits the rotation of the stretcher members 21 about the pivot 24. In these examples, a single stop 25 is provided per stretcher member that acts to limit the degree of rotation of the stretcher members 21 in both directions. However, it will be appreciated that more than one stop 25 may be provided per stretcher member 21.

(69) When the stretcher members 21 are in a rotated position, as shown in FIG. 8 and FIG. 9, the tops of the stretcher members 21 are exposed to the reactive species of the cold plasma, and are thereby sterilised. Therefore, during use of the device the stretcher members 21 are sterilised so that use of the device does not spread bacteria over the skin 5.

(70) FIG. 10a to FIG. 10c show another example of a stretcher member 21 of FIGS. 7a to 7d.

(71) In this example, the stretcher member 21 comprises a hub portion 27, which is attached to the pivot 24, and two protruding arms 28 that form a ‘V-shape’ and contact the skin 5. As shown in FIG. 10a and FIG. 10c, the stretcher member 21 rotates as the device is moved across the skin 5 in the direction of arrows 22, 23.

(72) As with previous examples, in the each of the rotated positions shown in FIG. 10a and FIG. 10c, one arm 28 of the stretcher member 21 is exposed to reactive species 26 of the cold plasma, thus sterilising that arm 28. Therefore, during use of the device the stretcher members 21 are sterilised so that use of the device does not spread bacteria over the skin 5.

(73) In the example of FIG. 11, the manipulator 10 includes a plurality of individual stretcher members 21 arranged in a line. The stretcher members 21 are mounted to a pivot 24 and can rotate about the pivot 24 independently of each other. In this way, when the device is moved across the skin the manipulator 10 can adapt to the shape of the skin, taking account of contours. Moreover, if the device were moved such that the manipulator 10 were rotated on the skin, then different stretcher members can pivot in different directions to provide the manipulation, as indicated by arrows 29, 30.

(74) The stretcher members 21 of any of FIG. 7a to FIG. 10c may be arranged as shown in FIG. 11. Furthermore, the manipulator 10 may comprise several of the lines of stretcher members 21 shown in FIG. 11, arranged in parallel as shown in FIG. 7a to FIG. 7d.

(75) In the example of FIG. 12a and FIG. 12b, the manipulator 10 comprises a plurality of cylindrical stretcher members 21. Each stretcher member 21 is effectively a roller that can be rolled across the skin 5. The stretcher members 21 are arranged in parallel to each other on the manipulator 10.

(76) The roller stretcher members 21 may each have a high friction coating to increase friction between the stretcher members 21 and the skin 5. Additionally or alternatively, the outer surface of the roller stretcher members 21 may be provided with a plurality of protrusions, for example resiliently flexible protrusions or bristles, such that the stretcher members 21 perform a brushing action as well as a stretching action.

(77) As indicated by arrow 31, the cold plasma device 1 may include an actuator adapted to rotate the roller stretcher members 21. Adjacent roller stretcher members 21 may be rotated in opposite directions such that the skin 5 in the region between two roller stretcher members 21 is stretched. The actuator may be adapted to alternate the direction of rotation to increase manipulation.

(78) In the example of FIG. 13a to FIG. 13c, the cold plasma device 1 comprises a manipulator 10 in the form of two belts 32, which are mounted on pulleys 33. At least one of the pulleys 33 may be driven by an actuator such that the belts 32 are rotated on the device 1. The belts 32 contact the skin 5 during use of the device 1 and act to manipulate the skin 5 to increase exposure of the reactive species.

(79) As shown in FIG. 13c, the belts 32 may include openings 35 to permit the reactive species of the cold plasma to reach the skin 5.

(80) As shown in FIG. 13a, the belts 32 may include a plurality of protrusions 34 to increase manipulation. The protrusions 34 may be attached to, or integral with, the belts 32. The protrusions may be rigid, or they may be resiliently deformable for example made from a rubber material. In some examples, the protrusions 34 may be bristles, or groups of bristles.

(81) In another example, the device 1 is provided with only one belt 32.

(82) As the belts 32 rotate, during use of the device 1, the tops of the belts 32 are exposed to the reactive species of the cold plasma. In this way, the surfaces of the belts 32 that come into contact with the skin are sterilised during use.

(83) In one example, adjacent belts 32 are rotated in opposite directions to increase manipulation of the skin 5. Alternatively or additionally, the actuator may be adapted to alternate the direction of rotation of the one or more belts 32.

(84) In these examples, the cold plasma device 1 can be moved across the skin in a direction perpendicular to the rotation of the belts 32.

(85) In the example of FIG. 14a and FIG. 14b, the cold plasma device comprises a spherical manipulator 10.

(86) As shown in FIG. 14a, the cold plasma generator 3 is housed within the spherical manipulator 10. In particular, the first electrode 6 and dielectric material 8 are also spherical and located within a spherical second electrode 7. Spacers 38 maintain separation between the second electrode 7 and the dielectric material 8.

(87) In one example, the second electrode 7 comprises a mesh. The mesh may be as described with reference to FIG. 3 to FIG. 5b, and may include protrusions 17 to manipulate the skin. The protrusions 17 may be attached to, or integral with, the spherical mesh 7. The protrusions 17 may be rigid, or they may be resiliently deformable for example made from a rubber material. In some examples, the protrusions 17 may be bristles, or groups of bristles.

(88) Alternatively, the second electrode 7 may be a separate mesh-like component mounted within, and spaced from, a further mesh that forms the manipulator 10.

(89) The spherical manipulator 10 is mounted on pivots 35 that permit the spherical manipulator to be rolled across the skin. The cold plasma generator 3 within the spherical manipulator 10 can be electrically connected to a power source via connections in the pivots 35.

(90) As shown in FIG. 14b, the spherical manipulator 10 may comprise a spherical ball 36 that is provided with a plurality of openings 37. The cold plasma generator (first electrode, second electrode and dielectric material) may be mounted within the spherical ball 36. Alternatively, the spherical ball 36 itself may be the second electrode.

(91) The openings 37 permit the reactive species of the cold plasma to reach the skin during use of the device.

(92) The spherical ball 36 may be provided with protrusions 17. The protrusions 17 may be attached to, or integral with, the spherical ball 36. The protrusions 17 may be rigid, or they may be resiliently deformable for example made from a rubber material. In some examples, the protrusions 17 may be bristles, or groups of bristles.

(93) In the example of FIG. 15, the manipulator 10 comprises a cylindrical roller 38. The cylindrical roller 38 may comprise a mesh, the cold plasma generator may be located within the mesh. Similarly to the example of FIG. 4a, the mesh itself may be the second electrode of the cold plasma generator.

(94) Alternatively, as shown in FIG. 15, the cylindrical roller 38 may comprise a cylindrical member that includes openings 39, and the cold plasma generator is mounted within the cylindrical roller 38. The openings 39 permit the reactive species of the cold plasma to reach the skin during use of the device.

(95) The cylindrical roller 38 may include a plurality of protrusions 17. The protrusions 17 may be attached to, or integral with, the cylindrical roller 38. The protrusions 17 may be rigid, or they may be resiliently deformable for example made from a rubber material. In some examples, the protrusions 17 may be bristles, or groups of bristles.

(96) The cylindrical roller 38 includes pivots 40 about which it rotates. The cold plasma generator within the cylindrical roller 38 may be electrically connected to a power source via electrical connections in one or more of the pivots 40.

(97) FIG. 16 shows an alternative cold plasma generator 3. In this example, the cold plasma generator 3 comprises a first electrode 6 and a second electrode 7 embedded within a dielectric material 8. This arrangement is a self-sterilising surface cold plasma generator, as previously mentioned.

(98) FIG. 17 shows an example of a cold plasma device 1 having a self-sterilising surface cold plasma generator 3 and a manipulator 10.

(99) In this example, the surface of the dielectric material 8 that faces the skin during use of the device is profiled, and constitutes the manipulator 10. In particular, as shown in FIG. 17 the dielectric material 8 is provided with a plurality of protrusions 41 that manipulate the skin as the device is used.

(100) The protrusions 41 may be arranged in an array, or in lines. The protrusions 41 may be elongate ridges and extend across the surface of the dielectric material 8, or they may be conically shaped protrusions.

(101) FIG. 18 shows an example similar to that of FIG. 17, but the second electrode 7, embedded within the dielectric material 8, is shaped to substantially match the shape of the profiled surface of the dielectric material 8, in particular the protrusions 41.

(102) As shown in FIG. 18, the second electrode 7 is shaped such that there is a substantially even distance between the outer surface of the protrusions 41 and the second electrode 7. Therefore, reactive species are more evenly generated across the cold plasma generator 3.

(103) FIG. 19 shows another example similar to those of FIG. 17 and FIG. 18. In this example, the first electrode 6 and the second electrode 7 are arranged such that they are equally spaced from the outer surface of the dielectric material 8. In this example, the first and second electrodes 6, 7, embedded within the dielectric material 8, are interwoven with each other, but always separated by the dielectric material 8. Both the first and second electrodes 6, 7 are shaped to substantially match the shape of the profiled surface of the dielectric material 8, in particular the protrusions 41. This creates a substantially even distance between the outer surface of the protrusions 41 and the first and second electrodes 6, 7. Therefore, reactive species are more evenly generated across the cold plasma generator 3.

(104) The above embodiments as described are only illustrative, and not intended to limit the technique approaches of the present invention. Although the present invention is described in details referring to the preferable embodiments, those skilled in the art will understand that the technique approaches of the present invention can be modified or equally displaced without departing from the spirit and scope of the technique approaches of the present invention, which will also fall into the protective scope of the claims of the present invention. In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality.

(105) Any reference signs in the claims should not be construed as limiting the scope.