COLD PLASMA GENERATING DEVICES, SYSTEMS, AND METHODS

Abstract

A system and method for cosmetic treatment of a region of a biological surface using cold atmospheric plasma is presented. In one embodiment, a method of treatment of a region of a biological surface with cold plasma includes: selecting a post-treatment formulation; and applying the post-treatment formulation to the region pre-treated by the cold plasma.

Claims

1. A method of treatment of a region of a biological surface with a cold plasma, the method comprising: selecting a post-treatment formulation; and applying the post-treatment formulation to the region pre-treated by the cold plasma.

2. The method of claim 1, further comprising: generating the cold plasma between a plasma treatment device and the region; and prior to applying the post-treatment formulation, switching off the cold plasma.

3. The method of claim 2, further comprising: activating an auxiliary treatment device, wherein the auxiliary treatment device is selected from a group consisting of (i) a vibration device, (ii) a source of ultrasound, (iii) a light source configured to illuminate the region, and (iv) a source of air directed to the region; and containing the cold plasma between the plasma treatment device and the region by a skirt disposed at least partially about the cold plasma.

4. The method of claim 1, further comprising: selecting a pre-treatment formulation; applying the pre-treatment formulation to the region; generating the cold plasma between a plasma treatment device and the pre-treatment formulation; switching off the cold plasma; and removing the pre-treatment formulation from the region.

5. The method of claim 4, further comprising: prior to applying the pretreatment formulation to the region, treating the pre-treatment formulation by discharging the cold plasma into the pre-treatment formulation; during generating the cold plasma between a plasma treatment device and the region, sensing one or more treatment parameters with one or more sensors; determining a plasma dose from the treatment parameters; and adjusting the plasma dose.

6. The method of claim 4 or 5, further comprising: optimizing at least one of the pre-treatment formulation and post-treatment formulation by a formulation engine configured for a machine learning; and modulating plasma parameters by the formulation engine based on sensing one or more treatment parameters with one or more sensors.

7. A cold plasma system for cosmetic treatment of a region of a biological surface, comprising: a cold plasma generator comprising: an electrode, and a dielectric barrier having a first side that faces the electrode and a second side that faces away from the electrode; and an auxiliary treatment device configured to enhance effects of the cold plasma on the region.

8. The system of claim 7, wherein the auxiliary treatment device is selected from a group consisting of (i) a vibration device, (ii) a source of ultrasound, (iii) a light source configured to illuminate the region, (iv) a source of air directed to the region; and (v) a source of heat directed to the region.

9. The system of claim 7, wherein the cold plasma generator comprises: a plasma generator body; and a head that is removeably attached to the plasma generator body, wherein the head has a mounting side facing the generator body and an application side that carries the electrode and the dielectric barrier.

10. The system of claim 7, wherein the electrode is pixelated into individually activated areas capable of generating the cold plasma, the system further comprising: a controller configured to energize the activated areas of the electrode.

11. A cold plasma system for treating a region of a biological surface, the system comprising: a plasma treatment device, including an electrode; and a dielectric barrier having a first side that faces the electrode and a second side that faces away from the electrode; at least one sensor configured to measure properties of at least one of a cold plasma, an ambient environment around the system, and the biological surface; and a controller operably coupled to the plasma treatment device and to the at least one sensor, wherein the controller is configured to receive input from the at least one sensors; determine control data for the plasma treatment device; and send control data to the plasma treatment device.

12. The system of claim 11, wherein the at least one sensor is selected from a group consisting of: a motion sensor; a humidity sensor configured to measure a humidity of ambient air; a reactive oxygen species sensor; reactive nitrogen species sensor; a light sensor; a plasma conductivity sensor; a surface temperature sensor; a distance sensor; and an ion concentration sensor.

13. The system of claim 12, wherein the controller is further configured to: determine effectiveness of the plasma treatment device based on the input from the at least one sensor; and determine a length of time for a safe plasma treatment based on the input from the at least one sensor.

14. The system of claim 11, further comprising at least one auxiliary treatment device configured to enhance effects of the cold plasma on the region, wherein the auxiliary treatment device is selected from a group consisting of (i) a vibration device, (ii) a source of ultrasound, (iii) a light source configured to illuminate the region, (iv) a source of air directed to the region; and (v) a source of heat directed to the region.

15. The system of claim 11, wherein the system is operatively coupled to a cloud storage system configured to: determine plasma parameters from the at least one sensor; and optimize at least one of a pre-treatment formulation and a post-treatment formulation by a formulation engine configured for a machine learning.

Description

DESCRIPTION OF THE DRAWINGS

[0099] The foregoing aspects and advantages of the inventive technology will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:

[0100] FIG. 1 is a schematic diagram of a plasma generator in accordance with prior art;

[0101] FIG. 2 is an image of a dielectric barrier discharge surface in operation in accordance with prior art;

[0102] FIGS. 3A-3B are two views of a cold plasma system in accordance with prior art;

[0103] FIG. 4 is a block diagram of a cold plasma system in accordance with prior art;

[0104] FIG. 5 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0105] FIG. 5A is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0106] FIG. 6 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0107] FIG. 7 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0108] FIG. 8 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0109] FIG. 9 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0110] FIG. 9A is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0111] FIG. 10 is a flowchart of a method of cold plasma treatment according to the present disclosure;

[0112] FIG. 11 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0113] FIG. 11A is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0114] FIG. 11B is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0115] FIG. 11C is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0116] FIG. 11D is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0117] FIG. 12 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure;

[0118] FIG. 13 is a schematic diagram of a cold plasma electrode system in accordance with the present disclosure; and

[0119] FIG. 14 is a flowchart of a method of cold plasma treatment according to the present disclosure.

DETAILED DESCRIPTION

[0120] While several embodiments have been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the inventive technology.

Cold Plasma System with Additional Treatment Devices

[0121] FIG. 5 presents a schematic diagram of a cold plasma treatment system in accordance with the present disclosure. In some embodiments, the cold plasma treatment system provides cosmetic treatment of a region of a biological surface 210 of a consumer 200. In some embodiments, the system includes a cold atmospheric plasma treatment device 100 including a plasma generator having an electrode 114 and a dielectric barrier 116.

[0122] In some embodiments, the plasma treatment device 100 includes a vibration device 130. Without being bound to theory, it is believed that the actuation of the vibration device 130 provides the consumer 200 with an enhanced treatment experience, and improves treatment efficacy by mitigating plasma 118 non-uniformity over the region. In some embodiments, the vibration device 130 may emit ultrasound vibrations. In operation, the ultrasound may enhance the transport of active plasma species into the tissue (or across diffusion barriers, in general) therefore increasing the efficacy of cold plasma treatment.

[0123] The vibration device 130 may vibrate the treatment device 100, thereby affecting the distance L between the second side of the dielectric barrier 116 and the biological surface 210. In some embodiments, the vibration device 130 vibrates the treatment device 100 in multiple axes simultaneously. In other embodiments, the vibration device 130 vibrates the treatment device 100 along only one axis. The vibration device 130 may vibrate the treatment device 100 such that the plasma 118 moves parallel to the biological surface 210 in one or two axes. It is believed that such movement distributes the plasma 118 across the region, thereby improving plasma 118 uniformity. The vibration device 130 may include one or more vibration sources, such as a piezoelectric actuator or a multi-axis eccentric mass vibrator.

[0124] FIG. 5A illustrates a cold plasma treatment system in accordance with the present disclosure. In some embodiments, the plasma treatment device 100 directly actuates the biological surface 210 by one or more actuating members 120. Without being bound to theory, it is believed that repeated tension and compression of the biological surface 210 enhances the efficacy of multimodal treatment by stimulating synergistic effects with permeability of plasma generated species and consumer 200 experience of the treatment. The actuating members 120 may be in direct contact with the biological surface 210 at or near the region. In some embodiments, the actuating members 120 move in opposite directions to each other, parallel to the biological surface 210. The actuating members 120 may move towards each other, in turn compressing and releasing the biological surface 210. The actuating members 120 may move away from each other, in turn stretching and releasing the biological surface 210. In some embodiments, the actuating members 120 move both towards and away from each other, thus both stretching and compressing the biological surface 210. In some embodiments, the plasma 118 is generated toward the region while the actuating members 120 actuate the biological surface 210.

[0125] The actuation may be in the form of the ultrasound emitted by the vibration device 130. In different embodiments, the ultrasound may be transmitted to the target biological surface 210 through the actuating members 120 capable of generating ultrasound. In some embodiments, the actuating members 120 form an annular shape with the electrode 114 and the dielectric barrier 116 contained within the annular shape. In other embodiments, a source of ultrasound may include multiple apertures for directing cold plasma toward the biological surface 210. In operation, an acoustic coupling medium may couple the source of ultrasound (e.g., the actuating members 120) with the biological surface 210. Some nonexclusive examples of such coupling media are hydrogels, solid gel pads, etc. The coupling medium can be formulated to have additional ingredients and properties to enhance the experience, such as precursors and ingredients that can be activated by plasma and/or work with it, fragrance etc. In some embodiments, no coupling gel is used and the source of ultrasound couples enough energy to biological surface even in the absence of coupling medium.

[0126] The actuating members 120 may actuate the surface without plasma 118 exposure, thereby providing a tactile experience to the consumer 200.

[0127] FIG. 6 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure. In addition to treatment by the plasma 118, the plasma treatment device 100 may include a light source 150, configured to illuminate the region with light 152 within the area described by the characteristic dimension T. As previously described, it is believed that irradiation of the biological surface 210 with light having a wavelength in the range of 400-500 nm provides desirable therapeutic results for cosmetic treatment of blemishes. In some embodiments, the plasma treatment device 100 includes multiple light sources. The light source 150 may include one or more light emitting diodes, individually emitting light having a wavelength within a target range.

[0128] The light source 150 may include an infrared light element, providing radiative heating to the biological surface 210. Without being bound to theory, it is believed that radiative heating of the biological surface enhances the therapeutic effect of plasma treatment by triggering a response of the biological surface 210 to plasma generated species and by providing an enhanced experience for the consumer 200.

[0129] The plasma treatment device 100 may include a cover 117 disposed on or over the dielectric barrier 116. Non-exclusively, the cover 117 may include plastic, glass, or quartz, and may block plasma generated species from reaching the biological surface 210. Without being bound to theory, it is believed that the plasma 118 may emit ultraviolet photons under certain conditions. As such, it may be desirable to block the transmission of ultraviolet photons using a cover 117.

[0130] FIG. 7 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure. In some embodiments, the plasma treatment device 100 includes a source of air that directs an air stream 162 to the region within the area described by the characteristic dimension T. The source of air may include an air mover 160, such as a fan or a blower, disposed within an air conduit 164 that is shaped to provide the air stream 162 at the surface of the region. In some embodiments, one or more temperature control elements 168 disposed within the plasma treatment device 100 adjust the temperature of the air. Non-limiting examples of the temperature control elements 168 include thermoelectric cooling elements including Peltier coolers, electric heating elements including resistive heating coils, etc. In some embodiments, a volatile oil is disposed within the air conduit 164 that contains a fragrance such that, when the air mover 160 is active, the oil imparts a pleasant aroma to the region.

Small Size Device

[0131] FIG. 8 presents a schematic diagram of a cold plasma treatment system in accordance with the present disclosure. In some embodiments, the plasma treatment device 100 is electrically connected to an external device 300 having a power cell 310 and a controller 320. In some embodiments, the plasma treatment device 100 is electrically connected to the external device via a cable 111. In some embodiments, the cable 111 carries control inputs and electrical power to the plasma treatment device 100. In some embodiments, the cable 111 is detachable from the plasma treatment device 100, the external device 300, or both. The power cell 310 may be a rechargeable battery including, for example a lithium ion battery. The controller 320 may be capable of receiving data and sending control signals to the plasma treatment device 100.

[0132] In some embodiments, the plasma treatment device 100 includes a battery 119 electrically connected to the electrode 114. The battery 119 may be rechargeable, charged by connecting the cable 111 to the plasma treatment device 100 and to a power source. Some non-limiting examples of such power source are the external device 300, an adapter connected to a standard wall outlet providing electricity, a solar cell, etc. In some embodiments, the battery 119 charges wirelessly 330. In some embodiments, the battery 119 is a commercially available battery, such as a battery of one of the A-series types (A, AA, or AAA).

[0133] In some embodiments, the external device 300 is a smart phone. In some embodiments, the external device 300 is a laptop or a tablet, configured to be compatible with the plasma treatment device 100 and to provide power and control inputs to the external device 300. In some embodiments, the external device 300 is a cosmetic tool, including but not limited to an electronic beard trimmer, a hair iron, a hair drier, an electronic epilator, etc. The external device 300 may be a large area plasma treatment device, as described previously, further including a charging dock for electrically connecting to the plasma treatment device 100. In some embodiments, the charging dock is configured to accept the plasma treatment device 100, which can be operably mounted into the large-area device for compact charging and operation as a plasma generator.

[0134] In some embodiments, the electrode 114 and the dielectric barrier 116 are disposed behind a cover 117. The cover 117 may be removable. The cover 117 may provide protection for the dielectric barrier 116 when the plasma treatment device 100 is not in use.

[0135] In some embodiments, the electrode 114 and the dielectric barrier 116 are disposed on a retractable support enclosed within the plasma treatment device 100. The retractable support may be configured such that when retracted, the dielectric barrier 116 and the electrode 114 are hidden from view and the plasma treatment device 100 cannot be activated. The retractable support may rotate through the action of a mechanism disposed at an end of the plasma treatment device 100 opposite to the dielectric barrier 116, such that the dielectric barrier 116 emerges from the opposite end of the plasma treatment device 100 in a manner resembling a lipstick. The plasma treatment device 100 may have a form factor similar or comparable to a retractable lipstick tube, such that it resembles the lipstick tube when inactive. In some embodiments, the retractable support is a linear slide that is configured to slide the electrode 114 and the dielectric barrier 116 behind the shield 119 when not in use.

[0136] In some embodiments, the plasma treatment device 100 is controlled via a user interface in the external device 300. In some embodiments, the external device 300 is any type of device including a battery, a general purpose computer, and computer readable memory with instructions stored thereon that, when executed by the computer implement a method of treatment of a region of a biological surface by cold atmospheric plasma.

[0137] In some embodiments, the plasma treatment device 100 includes one or more user controls including, but not limited to, a power switch, a plasma intensity selector, and a safety switch. The plasma treatment device 100 may be switched on and switched off using a power switch disposed on the plasma treatment device 100, and the plasma 118 is generated while the plasma treatment device 100 is on. In some embodiments, a safety switch prevents the plasma treatment device 100 from turning on until the safety switch is disengaged. In some embodiments, the safety switch is a fingerprint reader. In some embodiments, a plasma intensity selector permits smooth and continuous modulation of the plasma intensity, in terms of a power supplied to the electrode 114. In some embodiments, the plasma intensity selector limits the plasma treatment device 100 to one of a number of discrete intensity settings, in terms of incremental steps in the power supplied to the electrode 114.

[0138] In some embodiments, the plasma treatment device 100 includes one or more light emitting diodes (not shown), providing therapeutic light to the biological surface 210. In some embodiments, the light emitting diodes provide blue light, in the range of 400-500 nm.

Cold Plasma with Formulation Dispensing

[0139] FIG. 9 presents a schematic diagram of a cold plasma treatment system in accordance with the present disclosure. In some embodiments, the plasma treatment device 100, including the dielectric barrier 116 and the electrode 114, discharges the plasma 118 into the biological surface 210 through a formulation 410. The formulation 410 may include one or more active ingredients, including but not limited to anti-oxidants, radical scavenging compounds, ultraviolet absorbing compounds, rejuvenating compounds, etc. In some embodiments, the radical scavenging compound is an anhydrous, glycol-in-silicone formula with ascorbic acid and ascorbyl glucoside. In some embodiments, the radical scavenging compound is a water-in-silicone emulsion with a large internal aqueous phase incorporating water-soluble active ingredients. Without being bound to theory, it is believed that the aqueous phase will form encapsulations, containing active ingredients. Rejuvenating compounds may include collagen, elastin, and the like. The formulation may include inactive ingredients, such as dyes, pigments, fragrances, essential oils, emulsifiers, viscosity modifiers, etc. In some embodiments, the dye may be chemically reactive, and may respond to changes in pH induced by exposure to the plasma 118.

[0140] As shown in FIG. 9A, in some embodiments the plasma 118 is discharged into the formulation 410 in a container 415, before application to the biological surface 210 at or near the region. Without being bound to theory, it is believed that the plasma 118 generates beneficial species in the plasma, including ions, radicals, and long-lived RONS. The plasma treatment device 100 may generate the plasma in proximity of the formulation 410, by placing the plasma treatment device 100 near the exposed surface of the formulation 410 while it is in the container 415.

[0141] In some embodiments, a pre-treatment formulation enhances the effects of exposure to the plasma 118 by including reagent compounds to generate RONS. In some embodiments, a post-treatment formulation reduces the potentially harmful effects of prolonged exposure to plasma generated species. For example, the post-treatment formulation may control the pH shift of the region after exposure to plasma generated species by including buffer compounds.

[0142] FIG. 10 illustrates a method of treatment 500 using the plasma treatment device 100 to generate the plasma 118 between the plasma treatment device 100 and the biological surface 210 that includes at least one formulation 410. In some embodiments, the method may include additional steps or may be practiced without all steps illustrated in the flow chart.

[0143] The method starts in block 510, and proceeds to a pre-treatment phase, including selecting a formulation, as shown in block 520, and applying the formulation to the region, as shown in block 530. As previously described, the formulation 410 may have protective or enhancing properties that improve therapeutic results following exposure to the plasma 118. In some embodiments, the formulation 410 is selected for reducing exposure of the region to ultraviolet photons produced in the plasma, or for enhancing production of RONS, etc.

[0144] In some embodiments, a pre-treatment formulation is applied to the region before exposure to the plasma 118. The method then proceeds to block 540, which includes generating the plasma 118. The plasma treatment device 100 may generate the plasma 118 in proximity to the region. The plasma treatment in block 540 may continue until the plasma 118 turns off. In some embodiments, the method then proceeds to block 550, where a post-treatment formulation is selected. The post-treatment formulation may be applied to the region following exposure to the plasma 118. The pre-treatment formulation and the post-treatment formulation may be identical or different, and selected to provide different effects to the region. The method ends in block 570. In some embodiments, the method includes removing the pre-treatment formulation following plasma treatment 540. In some embodiments, the method includes removing the post-treatment formulation after applying the post-treatment formulation 560.

[0145] Modular Cold Plasma Generating Device FIG. 11 is a schematic diagram of a cold plasma treatment system 100 in accordance with the present disclosure. In some embodiments, the system includes a treatment device body 100 and a head 110 that is removeably attached to the treatment device body 100. The illustrated head 110 has a mounting side facing the treatment device body 100 and an application side carrying an electrode 114, and a dielectric barrier 116 has a first side facing the electrode 114 and a second side facing away from the electrode 114. The cold plasma system 100 may include a plurality of attachable heads 110 for cosmetic treatment over a region of a biological surface 210. The biological surface 210 includes, but is not limited to, skin, hair, fingernails, etc.

[0146] In some embodiments, a head 110-x is selected to produce the cold plasma 118 to execute a particular treatment. For example, when treating a relatively small region on the biological surface 210, a size of plasma 118 may be selected to avoid exposing the non-target portion of the biological surface 210 to plasma-generated species. Here, the term size of plasma refers to a characteristic or a descriptive dimension of the plasma. For example, for a plasma generated by a round electrode 114, the characteristic dimension of the plasma is related to a diameter of the electrode 114.

[0147] As illustrated in FIG. 11A, a head 110a may be selected and attached to the treatment device body 100. The head 110a tapers from a larger size at the mounting side to a smaller size at the application side. Therefore, the illustrated head 110a generates the plasma 118 having a characteristic size that differs from the diameter of the mounting side of the head 110a. While FIG. 11A illustrates the head 110a having the application side that is smaller than the attachment side, it should be understood that the reverse is also possible. For example, the head 110a may have its application side larger than the attachment side to cause a low intensity treatment over a region of the biological surface 210.

[0148] As illustrated in FIG. 11B, a head 110b may include a formula reservoir 180 and an exuding surface 186 on the application side of the head 110b. The exuding surface 186 may be connected to the formula reservoir 180 via one or more conduits 184. In some embodiments, the formula exuding surface 186 includes one or more nozzles on the application side of the head 110b. In some embodiments, the formula exuding surface 186 is a porous material having a void volume to buffer the flow of formula from the formula exuding surface. The porous material may include a cured gel, a soft plastic foam, a rigid plastic foam, a natural porous material such as pumice, etc. In some embodiments, the formula exuding surface 186 may include a vent barred by one or more grills, a wire mesh screen, a patterned perforated screen, etc.

[0149] In some embodiments, the formula reservoir 180 is compressed by pressure when the application side of the head 110b is applied to the biological surface 210. In some embodiments, the formula reservoir 180 is compressed by a mechanism enclosed within the head 110b including, but not limited to an electric actuator, a servo, a manually operated lever, a roller, a pair of rollers, etc. In some embodiments, the formula reservoir 180 is removable and interchangeable, and contains a prepared formula tailored to a desired therapeutic or cosmetic result.

[0150] In some embodiments, the formula includes one or more cosmetic ingredients. Cosmetic ingredients may include a fragrance, a pigment, a cream, an oil, a natural extract, a moisturizer, etc. In some embodiments, the formula includes one or more medicaments, for example, astringents, pharmaceutically active compounds, acid neutralizing creams, anti-oxidants, etc. In some embodiments, the formula includes one or more protective compounds to protect the biological surface from potentially harmful effects of exposure to the plasma 118. Some non-limiting examples of such protective compounds are an anti-oxidant, a moisturizer, a clarifying cream, an acidity buffering cream, etc.

[0151] In one embodiment, the head 110b includes a flexible skirt 170 at the application side of the head 110b. In some embodiments, the flexible skirt 170 is made from corrugated plastic or soft rubber, and attached to the application side of the head 110b. In some embodiments, the flexible skirt 170 is compressed by contacting the biological surface 210. In some embodiments the flexible skirt 170 includes a rigid spacer 174, restricting the compression of the skirt 170, thereby defining a minimum spacing between the head 110b and the biological surface 210. In some embodiments the flexible skirt 170 is impermeable to gases and, when compressed, creates a contained environment for the plasma 118 to form therein. The rigid spacer 174 may be enclosed by the flexible skirt 170 or may be external to it, and may be added or removed. In some embodiments, the rigid spacer 174 includes a conductive material including but not limited to a metal. In some embodiments, the rigid spacer 174 including a conductive material is biased at a voltage greater than or equal to zero. Without being bound to theory, it is believed that the rigid spacer 174 thus biased may allow the plasma to form between the head 110b and the rigid spacer 174, thereby reducing the dose of ions and electrons directed to the biological surface 210. In some embodiments, the plasma 118 discharging into the rigid spacer 174 produces RONS that are contained in the volume defined by the flexible skirt 170.

[0152] In one embodiment, the head 110b includes a filter 190 for filtering the plasma 118. The filter 190 may be placed between the head 110b and the biological surface 210, e.g., on a path of the plasma 118 applied to the biological surface.

[0153] In some embodiments, the filter 190 is an ultraviolet filter, placed at least partially to block the path of ultraviolet photons from the plasma 118 to the biological surface 210. In some embodiments, the filter 190 blocks ultraviolet photons because the filter is made of UV absorbent or UV scattering material, including, but not limited to, plastic, glass or quartz treated with a UV-blocking film, etc.

[0154] In some embodiments, the filter 190 is a chemical filter designed to sequester or convert one or more plasma generated species that would otherwise reach the biological surface 210. In some embodiments, the filter 190 includes a carbonaceous material, non-limiting examples of which include graphene, carbon nanotubes, activated carbon paper, carbon fiber, etc. In another embodiment, the filter 190 includes a catalytic material, non-limiting examples of which include metal particles embedded in a porous matrix. In some embodiments, the filter 190 includes radical scavenging materials, for example, antioxidants, including catalases, glutathione peroxidase, superoxide dismutase (SOD), -tocopherol (Vit. E), ascorbic acid (Vit. C), carotene (Vit. A), selenium, etc. In some embodiments, the filter includes a pH sensitive polymer that responds to changes in proton concentration by changing its porosity, surface properties, dimensions, etc. Some non-limiting examples of such pH sensitive polymers include polyacids and polybases, chitosan, hyaluronic acid, and dextran. In some embodiments, the filter responds to changes in pH by opening pores and releasing one or more of the previously described radical scavenging materials.

[0155] In some embodiments, the filter 190 includes a liquid formula that is applied to the biological surface 210 upon contact. The liquid formula may include any of the previously mentioned filter materials, carried in a liquid emulsion including but not limited to a cream or an oil. In some embodiments, the liquid formula filter 190 includes additional materials such as cosmetic ingredients, medical ingredients, etc. In some embodiments, the liquid formula includes an indicator material that provides a colorimetric indicator of exposure to plasma generated species. In some embodiments, the indicator material is a pH sensitive dye that will change color when the biological surface 210 has been exposed to a concentration of plasma-generated acidifying or alkalizing species that is sufficient to alter the molecular structure of the dye. Non limiting examples of pH sensitive dye include Gentian violet, Methyl yellow, Methyl red, Cresolphthalein, Indigo carmine, etc.

[0156] In some embodiments, the filter 190 includes a charged particle filter placed between the plasma 118 and the biological surface 210 that attracts and neutralizes charged particles present in the plasma 118. In some embodiments, the charged particle filter includes one or more conductive elements, individually biased at a nonzero voltage. Non-limiting examples of a conductive element include a metal screen, a metal probe, a metal ring, etc., placed near or around the dielectric material 116 on the application side of the head 110b. In some embodiments, the charged particle filter selectively filters out positive ions by having a negative polarity, therefore neutralizing the positive ions that approach the surface of the filter 190. In some embodiments, the charged particle filter filters out all charged particles by combining multiple conductive elements, e.g., at least one conductive element carrying a negative polarity and at least one conductive element carrying a positive polarity.

[0157] As illustrated in FIG. 11C, the biological surface 210 includes contours that may affect the uniformity of exposure of the region to the plasma 118. Non-limiting examples of contoured biological surfaces 210 include regions on a face and body, including but not limited to convex surfaces such as the cheekbones, the chin, the eyebrows, the nose, the jaw, knuckles, ankles, elbows, knees, etc. Similarly, contoured biological surfaces 210 may include concave surfaces, as in the area beneath the jaw, around the ears, along the neck, etc. In some embodiments, a head 110c includes a conformable material on the application side. The conformable material is configured to reversibly conform to the contours of the region. Non-limiting examples of the conformable material include gel, cured foam, rubber, plastic, etc. In some embodiments, the conformable material on the head 110c includes a consumable material, for example a dry solid, a moisturizing gel, a water soluble cream, etc.

[0158] In some embodiments, the application side of the head 110c is reversibly conformable with respect to the biological surface 210. In some embodiments, the dielectric barrier 116 includes a flexible surface, including but not limited to a woven dielectric cloth, such as a glass cloth, a ceramic cloth, etc. In some embodiments, the electrode 114 includes a flexible conductive surface, such as a woven metal cloth, copper mesh, stainless steel mesh, etc. In some embodiments, the flexible surface included in the dielectric barrier 116 is sealed to prevent accumulation of material abraded from the biological surface 210 during the plasma treatment. The flexible surface may be sealed with a coating including, but not limited to, Teflon, SiO.sub.x film, graphene, etc.

[0159] As illustrated in FIG. 11D, a head 110d may provide an air cushion between the head 110d and the biological surface 210. In some embodiments, the head 110d includes a plurality of air conduits 164 that at least partially surround the electrode 114 and the dielectric barrier 116. In operation, the air mover 160 provides air to the air conduits 164 (e.g., nozzles, vents, etc.) that direct a vectored flow of air away from the head 110d. The flow of air may create an air cushion that prevents or at least minimizes a contact between the head 110d and the biological surface 210. In some embodiments, the air mover 160 is an electric fan, located within the head 110d. The air mover may operate independently from the electrode 116 and may be turned on and turned off without altering the state of the plasma 118.

Cold Plasma Device with Sensors

[0160] FIG. 12 is a schematic diagram of a cold plasma treatment system in accordance with the present disclosure. In some embodiments, the cold plasma treatment device 100 includes one or more sensors 140 to measure plasma parameters. Based on the measured plasma parameters, a controller 142 may control the cold atmospheric plasma 118 and maintain a predetermined cosmetic treatment over a region of a biological surface 210.

[0161] As previously described, in some embodiments, the cold atmospheric plasma 118 is formed using the biological surface 210 as a floating reference electrode. Without being bound to theory, it is believed that such an arrangement is sensitive to non-uniform distribution of water and ion concentrations over the biological surface 210. It is believed that a localized region that is relatively rich in ions, such as a sweat gland, may provide a preferred conductive path for plasma-generated charged species, and the cold atmospheric plasma 118 may form preferentially at such a site on the biological surface 210. In turn, plasma preference for a particular location over another on a biological surface 210 introduces poorly controlled non-uniformity in treatment and variability in plasma dosage over the region treated by the plasma 118. It is believed that uniformity is an important criterion in the operation of a cold atmospheric plasma source. Therefore, in at least some embodiments, the design of the plasma treatment device 100 takes into account the sensitivity of the cold atmospheric plasma 118 to variations in properties of the surface 210.

[0162] Uniformity of the plasma 118 is defined in terms of a variability of one or more plasma parameters, for example, discharge power, discharge volume, the concentrations of plasma generated species, etc. In a highly variable system, for example, where the treatment region contains many discrete sub-regions of disparate properties, the plasma treatment device 100 may exhibit discontinuities in the discharge current or discharge voltage as the plasma treatment device 100 translates between ion-rich and ion-poor sub-regions of the surface 210. Without being bound to theory, it is believed that a plasma source, passing over a conductive sub-region may exhibit a spike in discharge current and a corresponding drop in discharge voltage.

[0163] In some embodiments, the controller 142 actuates an electronic ballast circuit, connected to the electrode 114. Without being bound to theory, it is believed that an electronic ballast circuit may permit the controller 142 to regulate the current to electrode 142, thereby preventing thermal runaway of the plasma 118 and constriction of the plasma 118 at one or more localized spots on the biological surface 210.

[0164] As illustrated in FIG. 12, which demonstrates an embodiment of the inventive technology, the plasma source 100 incorporates one or more sensors 140 to measure parameters of a cold atmospheric plasma 118 and a biological surface 210. In some embodiments, the plasma treatment device 100 includes sensors 140 that measure plasma parameters. The plasma parameters may include measurements of the electric current discharged into the biological surface 210, the voltage drop between the dielectric barrier 116 and the surface 210. The plasma parameters may include one or more parameters indicative of the energy density of the plasma 118, such as the spectrum of light emitted by the plasma 118, the ion-density in the plasma 118, or variation in time of the prior-mentioned parameters that would indicate non-uniform surface treatment. Without being bound to theory, it is believed that one or more short-lived discontinuities in the discharge voltage or discharge current indicates a non-uniformity in the form of preference of the cold atmospheric plasma 118 for one or more highly localized ion-rich regions on the surface.

[0165] In some embodiments, one or more sensors 140, placed on the surface 210 at or near the treatment region, measure parameters of the plasma 118 or of the biological surface 210. For example, the plasma treatment device 100 may include ion sensors, such as pH sensors or chloride sensors, light sensors, reactive oxygen sensors, a surface temperature sensor, a distance sensor, humidity sensors, etc.

[0166] In some embodiments, sensors 140 placed either on the surface 210 or on the plasma treatment device 100 measure the ambient environment. Such sensors 140 may include ion sensors, light sensors, reactive oxygen sensors, temperature sensors, humidity sensors, etc.

[0167] In some embodiments, a position reference sensor placed on the plasma treatment device 100 is operably coupled to a distance sensor on the biological surface 210. The position reference sensor may determine the distance of the dielectric barrier 118 from the surface 210. In some embodiments, a distance sensor, such as a laser rangefinder included in the plasma treatment device 100, measures the distance from the dielectric barrier 118 to the surface 210.

[0168] In some embodiments, the sensors 140 communicate with the controller 142, as part of the plasma source 110. The controller 140 may be operably coupled to the plasma treatment device 100, and may receive input from the sensors 140 and process that input to determine control data for the plasma treatment device 100. In some embodiments, the control data includes, but is not limited to, signals sent to electronic components of the plasma treatment device 100 to modulate the current or the voltage provided to the electrode 116, and signals sent to other components of the plasma treatment device 100 to produce a perceptible signal. In some embodiments, the perceptible signal is a haptic feedback or an audible or visible indicator. In some embodiments, the controller 142 sends control data in response to an unsafe dose of energy or reactive species produced by the plasma 118.

[0169] As previously described, without being bound to theory, a plasma dose is believed to determine exposure to one or more plasma generated species such as, reactive chemical species, energetic species including ions and electrons, photons, etc.

[0170] In some embodiments, a plasma dose is a concentration of a given species imparted to a given region on the biological surface 210 over a period of time, expressed as a number per unit-area, per unit-time (such as per square-centimeter seconds). In some embodiments, the controller 142 determines a treatment duration and control data to send to the plasma treatment device 100, by integrating the plasma dose over the area of the dielectric barrier 116, to provide a plasma dose per unit time.

[0171] In some embodiments, when the plasma treatment device 100 remains over a given region on the biological surface 210 for a length of time such that the plasma 118 is likely to harm the surface 210, the plasma treatment is considered unsafe. Conversely, in some embodiments, if the treatment device 100 remains over the given region for a length of time such that the plasma 118 is unlikely to have the desired effect, the plasma treatment is considered to have provided an ineffective dose. In some embodiments, these doses are not unique values, but rather are thought to occur in ranges. As such, a controller 142 may determine an unsafe range or an ineffective range of doses, wherein it will send control data to the plasma treatment device 100 to produce a perceptible signal or to modulate the plasma 118, or both.

[0172] In some embodiments, the controller 142 responds to an unsafe dose by sending a signal for the source to be moved away from the region on the biological surface 210 toward a second region. The controller 142 may respond to an unsafe dose by sending control data to the electronic components of the plasma treatment device 100 to turn off the plasma 118, or to modulate the power provided to the electrode 114 to diminish the generation of energetic species and reactive species in the plasma 118.

[0173] In some embodiments the plasma 118 is generated by a plurality of pixelated electrodes 114i,j arranged in a matrix, as shown in FIG. 13. The pixelated electrodes may be individually addressable by the controller 142, where the controller determines a discharge power for a given pixelated electrode 114. In some embodiments, the controller uses input from current and voltage sensors 140 for the pixelated electrodes 114i,j to counteract non-uniform plasma 118 constriction or localization. In some embodiments, when the plasma 118 localizes to a spot on the biological surface 210 having disparate chemical or physical properties, the controller 142 receives input indicating which pixelated electrodes 114i,j are drawing a disproportionate rate of electrical power, relative to the average for the matrix 114. The controller 142 may modulate the plasma 118 by turning off the electrodes 114i,j that are drawing excess power, thereby distributing plasma energy to operational electrodes O, and diminishing the undesirable effects of plasma non-uniformity near the non-operational electrodes NO.

[0174] The components of the cold plasma system 100 may communicate directly through wired and powered connections. These components may communicate to each other via a network (not shown), which may include suitable communication technology including, but not limited to, wired technologies such as DSL, Ethernet, fiber optic, USB, and Firewire; wireless technologies such as WiFi, WiMAX, 3G, 4G, LTE, and Bluetooth; and the Internet.

[0175] In some embodiments, the controller 142 includes a non-transitory computer readable medium having computer executable instructions and data stored thereon that cause, in response to execution by one or more processors of a computing device, the computing device to implement a method of treatment 600 as described herein and illustrated in FIG. 14.

[0176] FIG. 14 is a flowchart of a method of cold plasma treatment according to the present disclosure. In some embodiments, the method of treatment 600 of the region of the biological surface 210 with the cold atmospheric plasma 118 includes generating the cold plasma between the plasma treatment device 100 and the region. The method of treatment 600 may include measuring one or more treatment parameters with one or more sensors 140 and determining a plasma dose from the treatment parameters. In some embodiments, the method of treatment 600 includes modulating one or more of the treatment parameters to adjust the plasma dose, and switching off the cold atmospheric plasma 118.

[0177] In some embodiments, the method may include additional steps or may be practiced without all steps illustrated in the flow chart. The method starts at block 605, and proceeds to block 610 where one or more sensors 140 measure treatment parameters, for example, ambient parameters and surface parameters. In some embodiments, prior to generating the plasma 118, the method 600 includes placing at least one sensor 140 onto the biological surface 210 at or near the region. As previously described, the sensors 140 may be operably coupled to the controller 142, and may provide sensor input to the controller 142 to be used in block 615 to determine plasma parameters necessary for effective treatment. In some embodiments, the plasma parameters are defined by default values, and the controller 142 does not act until the plasma 118 has been turned on. In some embodiments, the plasma parameters include a discharge voltage as a function of time, a discharge current as a function of time, a plasma temperature as a function of time, or a gas temperature near the region as a function of time. In some embodiments, the sensor measurements are provided to a data storage system 620, which may aggregate the measurements with other sensor data. In some embodiments, a parameter engine communicates parameter information to the controller 142 as shown in block 627. The parameter engine determines a treatment dose based on aggregate sensor inputs accumulated and stored in a data storage system 620, and further determines a set of plasma parameters that are provided to the controller 142.

[0178] In block 630, a cosmetic formulation is applied to the treatment region. In some embodiments, the cosmetic formulation enhances plasma treatment. In some embodiments, the cosmetic formulation protects the biological surface 210 from harmful aspects of the plasma 118. A formulation engine, shown in block 625, may determine the formulation, which may receive input from the data storage system 620. In some embodiments, the formulation engine applies machine learning to optimize the components of the formulation for a given purpose such as radical scavenging, UV absorption, electrical conductivity, thermal conductivity, etc.

[0179] In block 635, the plasma treatment device 100 applies the cold atmospheric plasma 118 to the biological surface 210 at the treatment region. In block 635, a post-plasma formulation is applied to the treatment region of the biological surface 210. As in block 630, the formulation may be determined by a formulation engine as shown in block 625. In some embodiments, the post-plasma formulation may be the same as the formulation of block 630. In some embodiments, the post-plasma formulation may be different from the formulation of block 630. In some embodiments, the post-plasma formulation neutralizes ions and moisturizes the biological surface 210. In some embodiments, the post-plasma formulation counteracts possible oxidative effects of plasma treatment by including anti-oxidant ingredients.

[0180] In block 645, the treatment may be repeated. In some embodiments, the controller 142 determines whether the treatment dose has been met at block 645. Where the treatment dose has not been met, the controller 142 may repeat the sensor measurements, determine new plasma parameters, and modulate the plasma to provide an effective and safe dose of plasma generated species. In some embodiments, the treatment is not repeated, and the method ends in block 650.

[0181] The controller 142 may determine plasma parameters from a group including a current provided to the electrode 114, a driving frequency, a voltage waveform, a peak to peak voltage, a root mean square voltage, a plasma temperature, a gas temperature, optical emission from the plasma 118, etc.

[0182] In some embodiments, the controller determines an indicator of uniformity of the cold atmospheric plasma 118. As previously described, uniformity describes the spatial distribution of plasma 118 between the second side of the dielectric barrier 116 and the biological surface 210, as well as whether a time-averaged flow of current between the two surfaces is evenly spread across the treated region on the biological surface 210. In some embodiments, the controller sends control data to the plasma treatment device 100 to modulate one or more of the plasma parameters in response to changes in the indicator of uniformity. The controller may determine the indicator of uniformity intermittently, based on sensor inputs provided to the controller 142.

[0183] As understood by one of ordinary skill in the art, a data storage system as described herein may be any suitable device configured to store data for access by a computing device. An example of the data storage system 620 is a high-speed relational database management system (DBMS) executing on one or more computing devices and being accessible over a high-speed network. However, other suitable storage techniques and/or devices capable of providing the stored data in response to queries may be used, and the computing device may be accessible locally instead of over a network, or may be provided as a cloud-based service. The cloud storage system 620 may also include data stored in an organized manner on a computer-readable storage medium.

[0184] In general, the word engine, as used herein, refers to logic software and algorithms embodied in hardware or software instructions, which can be written in a programming language, such as C, C++, COBOL, JAVA, PHP, Perl, HTML, CSS, JavaScript, VBScript, ASPX, Microsoft .NET, PYTHON, and/or the like. An engine may be compiled into executable programs or written in interpreted programming languages. Software engines may be callable from other engines or from themselves. Generally, the engines described herein refer to logical modules that can be merged with other engines, or can be divided into sub engines. The engines can be stored in any type of computer readable medium or computer storage device and be stored on and executed by one or more general purpose computers, thus creating a special purpose computer configured to provide the engine or the functionality thereof.

[0185] Many embodiments of the technology described above may take the form of computer- or controller-executable instructions, including routines executed by a programmable computer or controller. Those skilled in the relevant art will appreciate that the technology can be practiced on computer/controller systems other than those shown and described above. The technology can be embodied in a special-purpose computer, application specific integrated circuit (ASIC), controller or data processor that is specifically programmed, configured or constructed to perform one or more of the computer-executable instructions described above. Of course, any logic or algorithm described herein can be implemented in software or hardware, or a combination of software and hardware.

[0186] From the foregoing, it will be appreciated that specific embodiments of the technology have been described herein for purposes of illustration, but that various modifications may be made without deviating from the disclosure. Moreover, while various advantages and features associated with certain embodiments have been described above in the context of those embodiments, other embodiments may also exhibit such advantages and/or features, and not all embodiments need necessarily exhibit such advantages and/or features to fall within the scope of the technology. Where methods are described, the methods may include more, fewer, or other steps. Additionally, steps may be performed in any suitable order. Accordingly, the disclosure can encompass other embodiments not expressly shown or described herein.

[0187] For the purposes of the present disclosure, lists of two or more elements of the form, for example, at least one of A, B, and C, is intended to mean (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C), and further includes all similar permutations when any other quantity of elements is listed.