Abstract:
A micro-needle roller infusion system for transdermal or intradermal delivery of active agents, skin-care products, and other topical formulations is provided. The infusion system comprises a needle roller assembly with needles enclosed in a housing with a disposable cartridge having the active agent. The device offers the advantages of creating a path for the active agents to reach or be injected into the desired depth for an easier, more effective interaction with the target skin layer. Apart from the approximation of the agent to the target, the device also provides biological benefits of the needling therapy of collagen generation and skin rejuvenation coupled with superior convenience and ease of use.

Description:
FIELD OF THE INVENTION 
     The present invention is directed to a device for the delivery of material or stimulus to targets within a body to produce a desired response, and in particular, to a dermal or transdermal delivery device including a number of projections or microneedles for the penetration or non-penetration of a body surface, delivery of bioactive substances, skin-care products, topical formulations, and other stimuli to living cells and intercellular matrix. 
     BACKGROUND OF THE INVENTION 
     Human skin is the largest organ in the body and is made up of multiple layers of ectodermal tissue. Skin regulates temperature and serves as a barrier against foreign agents, toxic substances, microorganisms, pathogens, and injury guarding the underlying muscles, bones, ligaments and internal organs. Human skin varies in thickness from location to location and can be as thin as 0.5 mm on the eyelids and as thick as 4 mm in the soles, palms and scalp. The skin is composed of two primary layers, the epidermis and the dermis. As shown in  FIG. 1 , the epidermis includes the outermost layers of the skin and forms a protective barrier responsible for keeping water and essential elements in the body and preventing pathogens and foreign substances from entering. The epidermis is subdivided into additional layers that include, beginning with the outermost layer and extending deeper into the skin, the stratum corneum, stratum granulosum, stratum lucidum, stratum spinosum, and stratum basale. The epidermis contains no blood vessels and cells in the deepest layers of the epidermis are nourished by diffusion from blood capillaries extending to the upper layers of the dermis. 
     The epidermis and the dermis are separated by a thin sheet of fibers called the basement membrane which controls the traffic of cells and molecules between the dermis and the epidermis but also serves, through the binding of a variety of cytokins and growth factors, as a reservoir for their controlled release during physiological remodeling or repair processes. The dermis includes many nerve endings and it also contains the hair follicles, sweat glands, sebaceous glands, lymphatic vessels and blood vessels which provide nourishment and waste removal from its own cells as well as for the epidermis. The top area of the dermis adjacent to the epidermis is called the papillary region and the deeper area is known as the reticular region. The papillary region includes papillae or fingerlike projections that extend toward the epidermis and interdigitates with the epidermis strengthening the connection between the two layers of skin. The reticular region lies deeper and includes collagenous, elastic and reticular fibers that provide strength and elasticity. Also located within the reticular region are the roots of the hair and sweat glands and blood vessels. Beneath the dermis is the subcutaneous fat layer. 
     Penetration of the outer layers of skin to deliver a pharmaceutical composition is a widely held practice.  FIG. 2  illustrates the penetration depths to reach certain layers of the skin. Approximately 0.25 mm penetrates the stratum corneum, approximately 0.5 mm from the outer surface reaches the middle of the epidermis, approximately 1.0 mm to approximately 2.0 mm reaches the basal layer; and approximately 2.5 mm penetrates the top of the dermis layer. In some applications, the bioavailability of an active ingredient may be increased with increased depth of penetration of the microneedles and hence, depth of delivery of the active ingredient. 
     Typically, injections of pharmaceuticals are achieved by subcutaneous delivery, intramuscular delivery, as well as intravenous delivery. Less invasive procedures have been developed and are also widely utilized. Among these less invasive procedures include topical applications such as patches, which are used to provide slow release of a composition. However, these patch delivery systems rely on formulations that can carry the active ingredients across the skin barrier into the blood stream. Therefore, there is a need for an article of manufacture that can be used to deliver a composition cutaneously or subcutaneously to the skin in a controlled and a convenient way that could be used by professionals or lay users. Specifically, there is also a need for an article that is capable of lancing the surface of skin or is capable of penetrating the surface of skin to a desired depth where a composition can be efficaciously applied. 
     One solution is the use of microneedles in which each individual microneedle is designed to puncture the skin up to a predetermined distance, which typically is desired to be greater than the nominal thickness of the stratum corneum layer of skin (the very outer layer of the skin out-covering the epidermis). Using such microneedles provides a great benefit in that the barrier properties of the skin are largely overcome. At the same time, the microneedles are relatively painless and bloodless if they are made to not penetrate through the epidermis, which is approximately less than 2.0-2.5 mm beneath the outer surface of the skin. 
     Microneedles require a direct pushing motion against the skin of sufficient force to penetrate completely through the stratum corneum. Furthermore, when the stratum corneum is penetrated, it is important to efficiently compel a matrix such as a liquid drug or other active ingredient though the relatively tiny openings created by the microneedles as the microneedles are usually quite small in diameter. 
     In general, microneedle stimulation systems are well known for their use in skin care treatment of various conditions such as wrinkles, acne scarring, stretch marks, skin whitening and facial rejuvenation. In microneedling, a method of piercing holes in the skin and applying drugs or cosmetics to the skin provides a way to rapidly and sufficiently permeate the skin. Another advantage of using microneedles is to injure the skin just enough to begin natural healing processes and stimulate collagen and elastin production, and the like, to heal the skin. In these methods, hundreds to thousands of tiny holes or microconduits are created in the skin with the microneedling device without damaging the deeper layers of the skin. This injury to the skin begins a natural healing process that leads to the release of natural stimulants and growth factors which stimulates the formation of new natural collagen and elastin in the papillary dermis to produce new, healthy skin tissue. Also, new capillaries are formed. This neovascularisation and neocollagenesis associated with the wound healing process leads to the formation of younger looking skin, reduction of skin pathologies and improvement of scars. Generally called percutaneous collagen induction therapy, microneedling has also been used in the treatment of photo ageing. Furthermore, medical substances may be applied to the site where the holes are created and the substances are supposed to permeate into the skin through the tiny holes. Microneedling is generally applied to the face, neck, scalp, and just about anywhere on the body where a particular condition warrants without removing or permanently damaging the skin. Microneedling is simple and safe. A predetermined number of needles are inserted into the skin to the desired depth. As a reaction to the minor injury, the skin tissue begins a natural wound-healing cascade. This natural process forms new healthy dermal tissue that helps smooth scars, remove wrinkles and improve pigmentation, and yields a younger, healthier and a cleaner-looking skin. 
     There is a need for an improved microneedling system. The present invention provides an improved microneedle roller system for mechanically perforating the outer skin layer in the presence of one or more active agents in a controlled environment that allows for approximation and absorption of the active compounds in a stable delivery environment. It is an object of the present invention to provide an improved microneedle mechanical delivery system that can provide a greater efficiency of flow from the device for one or more types of compounds topically and/or through the stratum corneum, and to the have the delivery system penetrate and stimulate the outer skin layers by a rolling motion across the skin at the same time. 
     SUMMARY OF THE INVENTION 
     The microneedle roller system of the present invention provides improved delivery of one or more active agents to the skin of a subject. The microneedle roller system generally comprises a housing having one or more cavities, wherein each cavity is adapted to receive one or more containers, reservoirs, cartridges and/or one or more active agents contained in the cavity or in the containers, reservoirs or cartridges that may be removable, interchangeable or replaceable. The housing encloses a skin penetrating device that is in fluid connection with the cavity in the housing. The skin penetrating device comprises a microneedle roller comprising one or more microneedles attached to and supported by a roller surface wherein movement of the roller over the skin of the subject causes a rotation of the roller and brings the microneedles into contact with the skin of the subject through an opening in the assembly resulting in penetration of the skin and the transdermal or dermal delivery of the active agent, the skin care product, the topical formulation, stimulation or combinations thereof present on or provided by the roller. The active agent comprises a formulation selected from the group including but not limited to a solution, a suspension, an emulsion, a lotion, a hydrgel, a semi-solid formulation, a cream and an emollient. In another aspect the active agent comprises a therapeutic or a prophylactic drug, wherein the drug is selected from the group including but not limited to of analgesic agent, an anti-inflammatory agent, an anti-allergic agent, a steroid, a local anesthetic, a muscle relaxant, a neurotoxin, an anti-itch agent, an anti-bacterial agent, an anti-fungal agent, vaccines, hormones, systemic drugs, dermatological active agents, herbal products, homeopathic preparations and combinations and modifications thereof. The device offers the advantages of creating a path for the active agents to reach or be injected into the desired depth for an easier, more effective interaction with the target skin layer. Apart from the approximation of the agent to the target, the device provides the well-known biological benefits of the needling therapy of collagen generation and skin rejuvenation coupled with superior convenience and ease of use. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a top perspective view of various layers of human skin. 
         FIG. 2  is a schematic of a side view of a microneedle roller and various layers of skin and their depths from the surface. 
         FIG. 3  is a top perspective view of a microneedle device according to the present invention. 
         FIG. 4  is a front view of a microneedle device according to the present invention. 
         FIG. 5  is a side, partial view of a microneedle device according to the present invention. 
         FIG. 6  is a side, partial view of a microneedle device with a sliding door in an open position exposing the skin penetrating device according to the present invention. 
         FIG. 7  is a side, partial view of a microneedle device with a sliding door in an open position exposing the skin penetrating device according to the present invention. 
         FIG. 8  is an exploded perspective view of a microneedle device according to the present invention. 
         FIG. 9  is a bottom, partial perspective view of a microneedle device with a door open showing the skin penetrating device according to the present invention. 
         FIG. 10  is a partial, side cross-sectional view of a according to the present invention. 
         FIG. 11  is a bottom perspective view of a microneedle device according to the present invention. 
         FIG. 12  is a partial bottom perspective view of a microneedle device in a load position according to the present invention. 
         FIG. 13  is a top perspective, cross-sectional view of a microneedle device according to the present invention. 
         FIG. 14  is a top partial view of a microneedle device according to the present invention. 
         FIG. 15  a partial cross-sectional view of a microneedle device according to the present invention. 
         FIG. 16  is a partial, semi-transparent view of a microneedle device according to the present invention. 
         FIG. 17  is a partial, cross-sectional view of a microneedle device according to the present invention. 
         FIG. 18  is a schematic of a microneedle and its cross-section according to the present invention. 
         FIG. 19  is a schematic showing micro-channels formed by the microneedles into the skin and product on the surface of the skin entering the micro-channels according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Turning to  FIGS. 3-17 , there is shown a microneedle roller device  20  according to the present invention. The microneedle roller  20  includes a handle  22  connected to a housing  24  at the distal end. The housing  24  may be permanently affixed to the handle  22  or may be configured to be removed and interchanged with another housing  24  such as a larger housing having a larger or longer roller or to replace a used housing with a new housing after use or with a housing having a roller with different needle lengths. The housing  24  may be connected via a spring or ball joint to allow the housing  24  to move easily up and down or right or left to adjust to the surface contours of the body in order to create a smooth movement over different anatomical areas. 
     The housing  24  includes a skin-penetrating device  26  that is in fluid communication with at least one cavity in the housing  24 . The skin-penetrating device  26  is a microneedle roller. The microneedle roller  26  is a cylinder having an outer surface provided with a plurality of very small needles or microneedles  28  extending outwardly from the outer surface. The microneedles  28  have a sharp distal end configured for mechanically perforating the outer skin layer. The proximal end of a microneedle  28  is embedded in the microneedle roller  26 . The length of the microneedle  28  that extends beyond the outer surface may be preselected or predetermined for the particular application for which the device is suited and designed for such as a roller having longer needles for penetrating deeper into the skin layers relative to a roller having shorter needles. The proximal end of a microneedle  28  may taper toward the distal end to create a sharp point or tip near the distal end. The microneedles  28  are made by reactive ion etching techniques of stainless, surgical steel or titanium metal or other alloy or plastic or appropriate material and do not necessarily be configured to penetrate the skin. The microneedles  28  are embedded into the outer surface of the cylindrical roller  26  which may be made of a resin, soft plastic, silicone or other polymer layer which may be molded over the needles  28 . A plurality of microneedles  28  are arranged in an array around the cylindrical outer surface of the roller  26  at a density of approximately 1-250 microneedles per square centimeter. When the roller  26  is rolled across the skin surface, they are configured to pierce the skin and penetrate the stratum corneum and create microconduits for fluidic transport into and/or across the stratum corneum. The microneedles  28  may be small enough to provide adequate stimulation of skin layers or large enough to create micrometer scale pathways across the skin for drug delivery of even the largest macromolecules. In another variation, the microneedles  28  are cannulated to provide a fluidic pathway through the needle  28  to an exit aperture at the tip of the needle  28 . In another variation, the cross-section of a needle taken perpendicular to the longitudinal axis of the needle may not only be circular but also diamond-shaped including a diamond shape having curved sides as shown in  FIG. 18 . In another variation, the needle  28  includes plastic mushroom heads to apply blunt pressure on the skin to create a micro-massaging effect and in another version non-penetrating, blunt-tipped, or mushroom-capped needles made of plastic or resin, for example, can provide local needling stimulation of the skin without penetrating it while applying topically the desired agents. The non-penetrating needles can be used for reflexology or massage. The outer surface of the cylinder  26  includes a spiral channel  30  for evenly distributing material across the outer surface of the roller  26  and onto the skin from the at least one cavity of the housing. The skin penetrating roller  26  includes an inner lumen for connection with at least one pin  32  inserted into the lumen.  FIGS. 3-17  show two pins  32  inserted into either end of the lumen and configured for the rotation of the roller  26  relative to the housing  24 . In one variation, a spring  34  is used to bias at least one of the pins  32  so that compression of the pins  32  inwardly will release the roller  26  from the housing for replacement or interchangeability with another roller  26 . The housing  24  further includes a first gear  36  connected to one of the pins  32  such that rotation of the roller  26  rotates the pin  32  which in turn rotates the first gear  36 . 
     The housing  24  of the device  20  further includes a chamber element  38 . The chamber element  38  includes two oppositely disposed end caps  40  that are spanned by a bottom wall  42  at least two side walls  44 . The end caps  40  serve as end walls which together with the bottom wall  42  and the two side walls  44  define a cavity  46 . In one variation that is shown in  FIG. 10 , three cavities  46   a ,  46   b ,  46   c  are defined by the two end caps  40 , bottom wall  42  and four side walls  44   a ,  44   b ,  44   c ,  44   d . The sidewalls  44  extend radially upwardly from the bottom wall  42  to define the height of the cavity  46 . The distance between the side walls  44  define the width of the cavity  46  and the distance between the end caps  40  define the depth of the cavity  46 . The cavity space may be varied. Each cavity  46  includes a slot  48  that is formed in the bottom wall  42 . In one variation, the slot  48  extends from end cap to end cap  40  along the entire depth of the cavity  46 . The slot  48  serves as an exit portal for material exiting the cavity  46 .  FIG. 10  shows three cavities  46   a ,  46   b ,  46   c  with each cavity having its own slot  48   a ,  48   b ,  48   c , respectively. The chamber element  38  includes two circular apertures  51  formed in the end caps  40 . The pins  32  extend through these apertures  51  to connect the roller  26  to the chamber element  38  such that the roller  26  can rotate relative to the chamber element  38 . A second gear  50  is connected to the outer surface of one end cap  40  on the same side of the chamber element  38  as the first gear  36 . This second gear  50  is configured to connect with the first gear  36  such that rotation of the first gear  36  moves the second gear  50  along a rack  54  of a pusher element  52  of the housing  24 . 
     The pusher element  52  includes a rack  54  having teeth for engaging with the second gear  50 . As the roller  26  rolls across the surface of the skin, it rotates the first gear  36  which in turn moves the second gear  50  along the rack  54  moving the pusher element  52  relative to the chamber element  38 . As shown in  FIG. 8 , the pusher element  52  includes two pusher end caps  56 . At least one of the end caps  56  includes a rack  54  comprising an open slot with teeth configured for engagement with the second gear  50 . At least one pusher  58  spans the two pusher end caps  56 . The pushers  58  are side walls that extend radially relative to the pusher end caps  56 .  FIG. 10  illustrates a pusher element  52  having three pushers  58   a ,  58   b ,  58   c  spanning the pusher end caps  56 . The three pushers  58   a ,  58   b ,  58   c  are spaced apart from each other such that when the chamber element  38  is disposed inside the pusher element  52 , the pushers  58   a ,  58   b ,  58   c  extend into each cavities  46   a ,  46   b ,  46   c , respectively. When the roller  26  rotates, the pushers  58  will move in the direction of the arrow  60  across the length of the cavity  46 . The pushers  58  are configured to squeeze or push material along the length of the cavity  46  and out of the cavity  46  through slots  48 . The pusher end caps  58  include apertures  62  configured for the passage of pins  32 . Knobs  64  that extend outwardly from the pusher end caps  56  are formed in the location encompassing the pusher apertures  62 . The knobs  64  permit rotation of the pusher element  52  into position to load and unload the cavities  46 . 
     The housing  24  further includes a housing cover  66 . The housing cover  66  has a proximal end with means for attachment to the handle  22 . The housing cover  66  is partially cylindrical in shape having an outer wall  68  interconnected with opposite end walls  70 . Each end wall  70  includes an aperture  72  for passing of pusher knobs  64  and pins  32 . The outer wall  68  includes at least one window  74  through which a marker  76  on the pusher element  52  is visible. Visibility of the marker  76  provides visual indication of how far along the length of the cavity  46  a pusher  58  has travelled, thereby, indicating to the user whether the cavity  46  is full or empty. The outer surface of the outer wall  68  also is provided with markings such as “FULL” and “EMPTY”. The housing cover  66  is partially cylindrical to provide an opening through which the needle roller  26  may extend. The opening is closed with a sliding door  78 . 
     The housing  24  further includes a sliding door  78 . The sliding door  78  is configured to connect with the housing cover  22  and to slide between an open position uncovering and exposing the needles  28  and a closed position covering the needles  28 . The sliding door  78  is also partially cylindrical in shape having partially circular end walls  80  interconnected by a partially cylindrical outer wall  82 . The outer wall  82  includes windows  84  that are aligned with the at least one window  74  in the housing cover  66  to permit visibility of the marker  76  on the pusher element  52 . The end walls  80  also include circular apertures  86  for the passage of pins  32  and knobs  64 . The perimeter of the apertures  86  are provided with markers  88  that provide indication to the user whether the door  78  is open or closed. Markings such as “OPEN” and “CLOSED” are provided on the end walls  70  of the housing cover  66 . The housing  24  or skin penetrating cylinder  26  may be varied with narrower width housings  24  or cylinders  26  used for smaller application areas in order to cover areas that are harder to cover with a wider housing  24  or cylinder  26 . The housings  24  may be removable and interchangeable with the handle  22  according to the intended use. Also the density of the microneedles  28  may vary from one skin penetrating cylinder  26 /housing  24  to another with the size of the skin penetrating cylinder  26  remaining constant or varying in size. The cylinder  26  or housing  24  may be interchanged with another cylinder  26  or housing  24  having a different microneedle density that is more suitable for the intended purpose or the severity of the treated skin condition. 
     The housing  24  is assembled by passing pins  32  into the lumen of the cylindrical roller  26 , one or more of which may be spring biased such that the pins  32  may be depressed relative to the roller  26  so that the roller may be released from the housing  24 . The roller  26  and pins  32  are disposed through the apertures  51  in the chamber element  38  and through the apertures  62  in the pusher element  52  and through the apertures  86  of the door  78  and through the apertures  72  of the cover  66 . The chamber element  38  is disposed within the pusher element  52  such that the first gear  36  contacts the second gear  50  which is connected to the rack  54  of the pusher element  52 . The door  78  is snapped into the housing cover  66  such that the door is movable between an open position and a closed position. The knobs  64  of the pusher element  52  can be turned between a first open position for loading the cavities  46  with material for dispensing and a second closed position indicating a loaded position. 
     In operation, the microneedle roller device  20  is turned over and the sliding door  78  of the housing  24  is opened to expose the skin penetrating device or roller  26 . The sliding door  78  protects the user from inadvertent puncturing with the microneedles  28  and prevents drying out of the material. The knobs  64  are turned to expose the cavity  46  through the opening in the housing cover  66 . The at least one cavity  46  is loaded with material. The material may be directly loaded into the cavity  46  or provided in cartridges or pouches or other container such as a capsule in which case the container is placed into each cavity  46 . The knobs  64  are turned to rotate the cavities  46  into the loaded position and expose the microneedles  28 . The exposed microneedles  28  are contacted with the skin and the roller  20  is rolled across the skin such that the microneedles  28  penetrate the skin. As the roller  26  rotates, the first gear  36  moves the second gear  50  relative to the rack  54  of the pusher element  52 . This action moves the pushers  58  along the length of the cavity  46 , thereby, pushing material or squeezing the cartridge or pouch so as to dispense material out of the cartridge or pouch and out of the cavity  46  through the slot  48  and onto the microneedles  28  and roller  26 . The first and second gears are metered to dispense the appropriate and desired amount of material onto the roller  26  and the spiral channels  30  in the roller  26  help to even out the material across the roller surface so that material is evenly applied onto the skin. With continues usage, the pushers  58  will move across the length of the cavity  46  until the cavity sidewall  44  is contacted at which point the marker  76  on the pusher element  52  will indicate through the windows  74 ,  84  that the cavity  46  is empty at which point the user can turn the knob  64  to expose the cavity  46  for reloading. After use, the sliding door  78  of the housing is closed to prevent material from drying out and to protect the user from inadvertent puncturing with the microneedles. In one variation, the roller  26  is configured such that moving the roller  26  in the opposite or backward direction relative to the skin instead of a forward movement will still move the pusher  58  to dispense material. In another variation, backward motion of the roller  26  results in the pusher  58  not moving and no new material being dispensed or pushed out of the cavity  46 . Hence, the device  20  can either dispense material only on forward movement or may be configured to dispense material during movement in both the forward and backward directions. 
     The microneedle roller device  20  may be further provided with a strip  90  located at the front of the device  20  and connected to the housing  24  such that the strip  90  makes contact with the skin prior to the skin coming into contact with the needles  28  of the roller  26  thereby prepping the skin with material. An additional strip  90  may also be placed at the back of the roller  20  after the needles contact the skin. The strip  90  may be provided with material that is an anesthetic to sooth or numb the pain that may be felt from the needles  28  puncturing the skin. Also, the strip  90  may be provided with the same material that is provided in the cavities  46  for extra absorption or any other material in wet or dry form, which may be released upon wetting and/or contact with the surface. The strip  90  may be sponge-like to retain material yet dispense an appropriate amount when in contact with the skin. Also, the strip  90  may be interchangeable and replaced when used. A rubber metering bumper may also be provided at the front of the device to help evenly distribute or smooth the material. To enhance the well-established advantages of microneedling, different active agents can be applied onto the skin prior or after the needling procedure. Such agents include but are not limited to vitamins, minerals, natural plant extracts, hyaloronic acid (HA), cosmetics, pharmaceuticals, moisturizers, homeopathic agents and the like. The material provided via the strips  90  may be the same or different from the material provided via the cavities  46 . 
     The microneedle roller device  20  may be further provided with a collection bar  92  located at the back of the device  20  and connected to the housing  24  such that the collection bar  92  makes contact with the skin after the skin comes into contact with the needles  28 . The collection bar  92  serves to collect excess material that may remain on the skin and to cycle the material back onto the roller  26  for re-application onto the skin. 
     The microneedling roller device  20  of the present invention offers the advantages of the needling therapy and at the same time ensures accurate, standardized and convenient means of delivering the chosen agent into the desired skin layer with the appropriate length needles. The use of the device  20  will provide collagen generation, skin rejuvenation and wound healing effect associated with the needling as well as the additional contribution provided by the adjuvant pharmaceutical/cosmetic agent or agents delivered by the device into the desired skin layer. 
     The housing  24  of the present device or alternatively the roller  26  may be replaced or sterilized and can carry one or more refillable cavities  26  or no refillable cavities that contain the active agent to be released upon contact with the skin so that the entire housing would have to be replaced with a new sterile housing. Alternatively, the roller  26  and housing  24  may be sterilized by the user employing a sterilizing agent in the form of a dissolvable tablet or liquid into which the housing is immersed. 
     While the microneedle roller device  20  is rolled over the device, the spring loaded handle  22  allows the housing  24  to adapt to the varying contours of the body. The needles  28  penetrate the skin to the desired layer creating microscopic conduits. The length of the needles determines the skin layer to be affected and the roller with the appropriate needle length is selected by the user accordingly. The dispensing cavities  46  and/or strips  90  release the active agent to the surface of the skin. The agent released by the front strip  90  will be pushed into the micro-openings in the skin created by the needles  28  that touch the skin immediately after. Any agent released by the back strip  90  will passively infiltrate the skin puncture holes. The device  20  may be used without any material to just stimulate the skin into natural collagen production, healing and rejuvenation. The device  20  provides an improvement in the accuracy in terms of the amount of material applied, providing more standardized homogenous application and a more convenient and less messy user experience. Furthermore, two or more active agents may be applied at the same time either by filing the different cavities  46  with different agents or providing the front strip or rear strip with an agent that is different from the agent provided in the cavities  46 . This application method will allow for a more efficient use of the active agents together with a better control of the amounts delivered. 
     As described above, the microneedles  28  may be cannulated or hollow so that material may be moved through the needle  28  and out through the tip of the needle. The material delivered to the tip of the needles will be directly injected into the skin layer into which the needles penetrate. The device may include external refillable dispensing chambers that contain an additional agent that would be dispensed onto the surface of the skin upon contact and will provide an additional means for a topical application. The device provides the ability to deliver one agent into the skin via the chambers, the front or back strips. Other features such as vibration of the housing and roller, ion release, heat emission, cooling features, sound (or ultrasound) emission, light (of different wave lengths) emission and electromagnetic discharge may be combined with the device  20 .  FIG. 19  illustrates micro-channels formed in the skin with product deployed on the surface of the skin migrating through the micro-channels formed by the microneedles  28  and reaching repaired and damaged cells. 
     The microneedle roller device  20  of the present invention may further include a display configured to present the user with specific information pertaining to the roller such as the distance the device has traveled on the skin, a calculation of the number of needling punctures delivered to the skin, and the amount of substance or dosage injected to the skin that is based on the concentration and the area treated. Sensor and a microprocessor may be included and configured to display the information on a small LCD screen located on the roller. Other information such as time for replacement, sterilization or replacement of medicament cartridge may also be calculated and indicated on the display screen. For example, rolling a particular device  20  for a distance of six inches will deliver a pre-calculated dose to the surface of the skin. The micro-processor can be programmed by the user or physician such that the indicator provides an information to the user that the pre-calculated dose has been delivered and that rolling may cease. Also, the device  20  itself may stop delivery of material from the reservoir chamber by closing off the chamber from dispensing material onto the cylinder. In one variation, the device  20  is configured to vibrate to further assist in projecting the needles into the skin or provide a massaging-effect. Also, vibration of the skin surface helps the material overcome static friction and penetrate or travel a longer, deeper distance into the skin. In such a variation, the vibrating motor may be provided inside the handle  22  or housing  24  or configured such that housing  24  vibrates relative to the handle  22  or such that the surface of the skin is vibrated. The device  20  according to the present invention may include a microprocessor and a transmitter such as a radio frequency or Bluetooth device to transmit information and/or provide control of the device  20  from an external location such as a computer, Internet connection, smart phone or other mobile computing device or tablet. The external device may be provided with a software application that monitors progress, including the storage of before/after photographs, progress notes, providing reminders, dosage changes and recommendations to and from a physician or user community. In another variation, the device  20  may further includes an infra-red light source or heating device located on the device and directed toward the surface of the skin in order to provide an adjuvant treatment modality. 
     The microneedle roller device  20  of the present invention can be used for cosmetic applications such as skin whitening, dark spots, cellulitis, wrinkle removal, pigmentation removal, melasma, stretch mark removal (apothederm), sun damage skin marks, acne treatment, post acne marks, hair removal agents, uneven skin tone, tattooing, tattoo removal, dry skin, skin hydration, skin tightening, general moisturizing, hand rejuvenation, loose skin, double chin, vitamin delivery, alopecia, hair loss and tanning. For scalp treatment purposes such as the treatment of migraines and hair growth, the microneedles may be longer, bigger and canulated in order to penetrate the thicker skin and to penetrate it more deeply. The microneedle roller device  20  according to the present invention may be configured with specialized needles such as longer or thicker needles for creating micro-channels in the scalp to facilitate the insertion of hair plugs into the scalp in a faster, more-even manner. It may also be used for dermatological conditions such as but not limited to acne, psoriasis, scars, keloids, burns, contractures, alopecia, scales, fungal infections and itching to apply agents like botox, restaline, collagen, steroids, regain, anti-scarring products, lattice and different local antimicrobial anti-fungal and other biologically active agents. Also, the device  20  may be used for medical applications such as immunizations, vaccinations, injections of hormones like insulin, growth factors, fertility supportive hormones, testosterone, local anesthetics, skin cancer, treatment for hemangiomas and varicose veins, colloidal silver, stem cell delivery and any other medical condition requiring controlled delivery of active agents to be used by medical professionals, by patients or by lay people. The needling effects of the device coupled with appropriate agents could be also used for soft tissue augmentation or phallic augmentation. 
     The device represents advantageous means of delivery of bio-active materials combined with higher convenience and ease of use. The device will also improve the efficacy of the delivered active agents as it creates micro-channels in the skin bringing the agents closer to their targets in the different layers of the skin. 
     An example for a cosmetic use in which the device may be used is skin-whitening procedures. Most skin-lightening treatments can reduce or block some amount of melanin production and are aimed at inhibiting tyrosinase. Many treatments use a combination of topical lotions or gels containing melanin-inhibiting ingredients along with a sunscreen and a prescription retinoid. Depending on how the skin responds to these treatments, exfoliants, either in the form of topical cosmetic or chemical peels and lasers may be used. For skin whitening, material that may be used with the device include hydroquinone which is the primary topical ingredient for inhibiting melanin production. Its components have potent antioxidant abilities. Topical hydroquinone comes in 2% solution typically available in cosmetics or higher concentrations that would require a prescription, alone or in combination with tretinoin 0.05% to 0.1%. Hydroquinone is a strong inhibitor of melanin production and its effect is on melanin hyper pigmentation. Another material that may be used with this device for skin whitening is azelaic acid which is a component of grains, such as wheat, rye, and barley. It is applied topically in a cream formulation at a 10-20% concentration. It is used to treat acne, but is also effective for skin discolorations by inhibiting the melanin production. Another material is Vitamin C which is considered to be an effective antioxidant for the skin and helps to lighten the skin by elevating glutathione levels in the body. Arbutin, which is found in pears and berries (bearberry, mulberry, white mulberry and paper mulberry), inhibits melanin production and may also be used with this device. Kojic acid is a by-product of rice in the fermentation process of sake. Research shows kojic acid is effective in inhibiting melanin production and as an antioxidant and can be used with the device  20 . Kojic acid is unstable in cosmetic formulations as it turns brown and lose its efficacy upon exposure to air or light. Many cosmetic companies use kojic dipalmitate as an alternative because it is more stable in formulations. Since the chambers of the device can host active materials in sealed cartridges, the unstable product can be stored in a vacuum packed cartridge that will maintain its stability until the time of use. Upon application with the device, the cartridge will be initiated (punctured) and the product will be immediately used. The device allows the use of individual single-use cartridges such as at each treatment session the consumer uses only the amount needed while the rest of the material (in other cartridges) does not sustain long term exposure to air or light and by that way the device allows for the use of unstable materials without the waste of unused materials.  Cinnamomum subavenium , a Chinese herb, is used as a skin whitening agent and may also be used in the present invention. The plant contains substances which inhibit production of tyrosinase an enzyme which catalyzes the production of melanin. Other commercially available skin whitening products such as Aveeno Positively Radiant Daily Moisturizer, Garnier Nutrioniste Skin Renew, Lancome Blanc Expert High Resolution Resurface-C, Shiseido Brightening Emulsion, Olay Definity may also be used with the device of the present invention. 
     Another example for a use of the invention is wrinkle removal. The device  20  of the present invention may be used effectively and more conveniently for the removal or reduction and prevention of wrinkles. A wrinkle is a fold, ridge or crease in the skin. Skin wrinkles typically appear as a result of aging processes, loss of body mass, or temporarily, as the result of prolonged immersion in water. Age wrinkling in the skin is promoted by habitual facial expressions, aging, sun damage, smoking, poor hydration, and various other factors. Wrinkle removing treatments that can be used with the present invention include tretinoin, which is also known as Retin-A, which decreases cohesiveness of follicular epithelial cells. Additionally, tretinoin stimulates mitotic activity and increased turnover of follicular epithelial cells. Epidermal growth factor (EPG) may also be used. EPG is a small polypeptide of 53 amino acids and is a cytokine or cell messenger protein that stimulates epithelial cell proliferation. Taken internally, EPG is used to treat conditions in premature infants, as well as enlarged prostate. In cream form, EPG stimulates cell renewal but decreases collagen production in the skin. It is also helpful for wound and burn healing and has achieved amazing cures of severe ulcerating skin diseases. Another group of materials that can be used with the present invention are dermal fillers to correct wrinkles, and other depressions in the skin. Glycosaminoglycans (GAGs) may also be used with the present invention. GAGs are produced by the body to maintain structural integrity in tissues and to maintain fluid balance. Hyaluronic acid, which is a type of GAG that promotes collagen synthesis can be also employed. GAGs serve as a natural moisturizer and lubricant between epidermal layers. Topical glycosaminoglycans supplements can help to provide temporary restoration of enzyme balance to slow or prevent matrix breakdown and consequent onset of wrinkle formation. Botulinum toxin is a neurotoxin protein produced by the bacterium clostridium botulinum, which is frequently used to treat wrinkles as it immobilizes the muscles that caused the wrinkle. It can also be used with the present invention to treat wrinkles by delivering the toxin to the right depth and dispersing it conveniently along the route of the wrinkle. Commercially available materials that may be used as a material in the present invention for the treatment of wrinkles include Neutrogena Ageless Intensives® Anti-Wrinkle Deep Wrinkle Serum, Olay Regenerist Micro-Sculpting Cream, Clarins Contouring Facial Lift, and L&#39;Oreal RevitaLift Deep-Set Wrinkle Repair. 
     It will be understood that many modifications can be made to the various disclosed embodiments without departing from the spirit and scope of the concept. For example, various sizes of the surgical devices are contemplated as well as various types of constructions and materials. It will also be apparent that many modifications can be made to the configuration of parts as well as their interaction. For these reasons, the above description should not be construed as limiting the invention, but should be interpreted as merely exemplary of preferred embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the present invention.