US20080131834A1 - Photocatalysis process toothbrush - Google Patents
Photocatalysis process toothbrush Download PDFInfo
- Publication number
- US20080131834A1 US20080131834A1 US11/946,263 US94626307A US2008131834A1 US 20080131834 A1 US20080131834 A1 US 20080131834A1 US 94626307 A US94626307 A US 94626307A US 2008131834 A1 US2008131834 A1 US 2008131834A1
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- United States
- Prior art keywords
- blue light
- head
- light source
- toothbrush
- handle
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B9/00—Arrangements of the bristles in the brush body
- A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
- A46B9/04—Arranged like in or for toothbrushes
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
- A46B15/0002—Arrangements for enhancing monitoring or controlling the brushing process
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
- A46B15/0002—Arrangements for enhancing monitoring or controlling the brushing process
- A46B15/0016—Arrangements for enhancing monitoring or controlling the brushing process with enhancing means
- A46B15/0034—Arrangements for enhancing monitoring or controlling the brushing process with enhancing means with a source of radiation, e.g. UV, IR, LASER, X-ray for irradiating the teeth and associated surfaces
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0601—Apparatus for use inside the body
- A61N5/0603—Apparatus for use inside the body for treatment of body cavities
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
- A61N5/0624—Apparatus adapted for a specific treatment for eliminating microbes, germs, bacteria on or in the body
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B2200/00—Brushes characterized by their functions, uses or applications
- A46B2200/10—For human or animal care
- A46B2200/1066—Toothbrush for cleaning the teeth or dentures
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0601—Apparatus for use inside the body
- A61N5/0603—Apparatus for use inside the body for treatment of body cavities
- A61N2005/0606—Mouth
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N2005/0658—Radiation therapy using light characterised by the wavelength of light used
- A61N2005/0662—Visible light
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0601—Apparatus for use inside the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
- A61N5/062—Photodynamic therapy, i.e. excitation of an agent
Definitions
- the present invention relates to dental hygiene and, in particular, to a toothbrush which emits radiation, in the near ultraviolet region of the electromagnetic spectrum, in order to oxidize and destroy potentially harmful bacteria and/or other contaminants or compounds contained within the mouth and also activate a photo catalyst that may be deposited on the teeth and the gums of the person utilizing the toothbrush during normal brushing.
- photocatalysis in dental hygiene processes is well established and stems from processes for purifying gases and liquids and for controlling bacteria and other microorganisms in gases and liquids and on the surfaces of solid objects.
- photocatalysis methods involve the photoexcitation of photocatalytic compounds, for example, catalytic n-type semiconductor particles such as TiO 2 particles, with ultraviolet (UV) light to activate the photocatalyst, which then participates in reduction/oxidation reactions with matter adsorbed to or in the near vicinity of the surface of the particles.
- photocatalytic compounds for example, catalytic n-type semiconductor particles such as TiO 2 particles
- UV light ultraviolet
- the reduction/oxidation reactions produce highly reactive hydroxyl radicals which oxidize and destroy bacteria and organic compounds in the gas or liquid or on the surface(s) being treated, such as bacteria and other organic substances associated with, for example, tooth decay, gum disease, denture stomatitis and halitosis/malodor.
- UV photocatalysis methods have generally only been performed in a dentist's offices by either a dentist or a dental hygienist using a specialized UV laser(s) or some other optical device(s) which emits a controllable, directed beam of UV light. More recently, however, there have been proposals to manufacture and sell UV photocatalysis devices to the general public, e.g., a toothbrush containing a UV light radiating device, together with toothpastes and/or mouthwashes containing photocatalytic particles, such as TiO 2 .
- the UV light emitted by a UV laser diode passes through a light guide to the end of the toothbrush which brushes the teeth where this light is emitted into the user's mouth by, for example, lenses implanted among the bristles or through fiber optic bristles that form at least part of the brush bristles.
- the bristles mechanically facilitate removal of plaque and/or other organic materials from the teeth and the gums during brushing, similar to brushing with a conventional toothbrush, while the UV light is emitted directly to illuminate photocatalytic particles distributed on the surfaces of the teeth and the gums, thereby providing both a conventional cleaning mechanism as well as a photocatalytic cleaning mechanism.
- UV photocatalytic toothbrushes which are marketed to consumers, however, have a number of significant problems, not the least being the potential hazards associated with such devices.
- UV light at any power level is typically capable of damaging human skin including the tissue of human eyes. Compounding this problem is the fact that UV light within this wavelength range is nearly invisible to a user or patient, so that it is difficult to determine where the emitted UV beam is directed or aimed.
- the duration of irradiation of the catalytic particles, at any particular location within the mouth is typically very short during the normal toothbrushing process, thus requiring higher power levels of UV radiation in order to obtain effective catalytic reactions.
- This problem is further compounded by the normal deterioration of the light transmission capability of the brush end elements, such as the lenses and the fiber optic elements, over time. Higher emitted power levels are generally called for in order to achieve satisfactory performance.
- the present invention provides a solution to the above described as well as other related problems associated with the prior art products and methods.
- a primary object of the invention is to provide a toothbrush which emits radiation, in the near ultraviolet region of the electromagnetic spectrum, to oxidize and destroy potentially harmful bacteria and/or other contaminants or compounds contained within the mouth.
- Another object of the invention is to provide a toothbrush that will activate a photo catalyst deposited on the teeth and the gums of the person utilizing the toothbrush during normal brushing.
- a further object of the invention is to provide a toothbrush which emits blue light within the 420 nm to 480 nm wavelength band, of the electromagnetic spectrum to avoid the normal hazards associated with using UV radiation as well as the corresponding FDA restrictions.
- Yet another object of the invention is to provide a toothbrush in which the radiated blue light emissions may be amplitude modulated from 0% to 100% at a frequency of between about two (2) and about two hundred (200) Hertz, more preferably between about 6 and about 60 Hertz and most preferably between about 10 and about 30 Hertz, with an average optical output power level of less than 5 watts.
- a still further object of the invention is to provide a toothbrush which is relatively inexpensive to manufacture which has a power source that is light weight and can be readily recharged or replaced as needed.
- the term “average optical output power level” means that the optical output power may briefly exceed 5 watts on modulation peeks how ever the total integrated power level over a time period of 1 second will not exceed 5 watts.
- FIG. 1 is a diagrammatic perspective view of a toothbrush according with the teachings of the present invention.
- FIG. 2A is a diagrammatic transverse cross sectional side view of the toothbrush of FIG. 1 ;
- FIG. 2B is a diagrammatic transverse cross sectional side view of the toothbrush of FIG. 1 ;
- FIG. 3A is an enlarged diagrammatic side elevational view of a brush head with the blue light source extending further away from the base of the head, then the embodiments of FIGS. 2A and 2B , so that the light is emitted adjacent the free ends of the bristles of the toothbrush;
- FIG. 3B is a diagrammatic transverse cross sectional side view of an alternative embodiment of a toothbrush which comprises a handle having a removal brush head;
- FIG. 3C is a diagrammatic transverse cross sectional side view of an alternative embodiment of a toothbrush in which the handle is integral with the brush head;
- FIG. 3D is a diagrammatic enlarged view of the brush head of FIG. 3C ;
- FIG. 4A is a diagrammatic enlarged view of an alternative embodiment of the brush head in which each individual blue light source is associated with a group of bristles attached to the brush head to supply the blue light along the length of the bristles;
- FIG. 4B is a diagrammatic enlarged view of a further embodiment of a brush head have each blue light source associated with a group of bristles attached to the brush head.
- the toothbrush 10 includes is includes a handle 12 having a grip 14 at its proximal end to be held in the user's hand while using the toothbrush 10 and a brush head 16 , typically including one or more groups of bristles 18 , located at the distal or working end of the handle 12 .
- the head 16 further includes one or more blue light emitters 20 that emit blue light 22 in the 450 nm +/ ⁇ 30 nm (nanometer) wavelength band, that is, in the wavelengths between 420 nm and 480 nm and at an average power level of less than 5 watts.
- the blue light has an average power level of between about 0.25 and about 1 watt and more preferably an average power level of between about 0.5 and about 0.95 watts.
- the blue light output from the emitters 20 may comprise solely a continuous emission of blue light having a combined power level of less than 5 watts, while in other applications the blue light output from the emitters 20 may comprise a modulated blue light emission having a frequency of between about two (2) and about two hundred (200) Hertz, more preferably between about 6 and about 60 Hertz and most preferably between about 10 and about 30 Hertz, having an average combined power level of less than 5 watts.
- the blue light output from the emitters 20 may comprise a first blue light component which is a continuous emission of blue light and a second blue light component which is a pulsed blue light emission at a frequency typically between two (2) and two hundred (200) Hertz a few Hertz and a few hundred Hertz, more preferably between about 6 and about 60 Hertz and most preferably between about 10 and about 30 Hertz.
- the combined total emission must not exceed an average output which is greater that 5 watts.
- the 420 nm to 480 nm wavelength band is within the visible “blue light” portion of the electromagnetic spectrum and is, therefore, below the UV light spectrum normally employed during conventional dental hygiene processes conventionally carried out by dentists and dental hygienist, thereby avoiding the normal hazards associated with using UV radiation as well as the corresponding FDA restrictions.
- the presently preferred photocatalytic agents for use with radiation within the 420 nm to 480 nm “blue light” band include, for example, modified TiO 2 semiconductor type materials and possibly other catalytic n-type semiconductor particles as well as various organic dyes already known in the art as being photocatalytically responsive to blue light radiation.
- the blue light emitters 20 emit blue light 22 in a direction generally perpendicular to an upper surface 24 of the head 16 thereby to radiate the blue light 22 into the mouth cavity of the person brushing his or her teeth, that is, the blue light is generally directed toward the teeth, the gums, and the tongue, being contacted by the bristles 18 as the toothbrush is used to brush the teeth.
- the blue light emitters 20 may comprise one or more blue light sources 26 A, such as blue light emitting diodes or blue light emitting organic light emitting diodes, or any other type of blue light emitting device located either on, within or partially recessed within the upper surface 24 of the head 16 to facilitate directly emitting the blue light 22 .
- the blue light source(s) 26 A may be located within the body of the head 16 or within handle 12 with the blue light 22 being conducted along the handle and/or body to the blue light emitters 20 where the blue light is finally emitted.
- One or more internal passages or light conductive elements, such as reflective surfaces, blue conductive fiber optics, lenses and/or any combination thereof are provided in the handle and/or body to facilitate transmission of the blue light to the blue light emitters 20 .
- the blue light source or sources 26 A will be described or defined as being located contiguous to the head 16 , such as at the top surface 19 of head 16 or within the body of head 16 , and it should be noted that for purposes of the present descriptions, the term contiguous is taken as meaning “in physical contact with” or “near, next to, or adjacent”.
- the blue light source or sources 26 A may be located non-contiguously with head 16 , such as in handle 12 , with the blue light 22 being conducted along the handle to blue light emitters 20 located within the head 16 by means of blue light optical conductors 26 B comprising, for example, of blue conductive fiber optic elements or lenses, reflective surfaces, passages or conductive “pipes” comprising blue conductive materials, and/or any combination thereof, which form a one or more paths that conduct the blue light 22 from the blue light source or sources 26 A to the blue light emitters 20 where the light is emitted.
- blue light optical conductors 26 B comprising, for example, of blue conductive fiber optic elements or lenses, reflective surfaces, passages or conductive “pipes” comprising blue conductive materials, and/or any combination thereof, which form a one or more paths that conduct the blue light 22 from the blue light source or sources 26 A to the blue light emitters 20 where the light is emitted.
- one or more blue light sources 26 A may be located in handle 12 at a position just below a neck 28 , formed at a junction between the handle 12 and the head 16 .
- the neck 28 , the head 16 and possibly portions of the handle 12 are constructed, for example, of a blue transparent material or with one or more blue transparent passage(s) or blue light conductive “pipe” which facilitate passage of the blue light 22 through the neck 28 to the head 16 and thereafter radiated from the blue light emitters 20 .
- the portions of the neck 28 through which blue light 22 is transmitted comprises a suitable blue transparent material, as does the body of the head 16 .
- the interior of head 16 includes a blue reflective surface 30 formed as facets 30 F wherein the blue light reflective properties of reflective surface 30 is formed, for example, by a coating applied at least between the surfaces of facets 30 F and an over-mold 30 O of a different material forming the back regions of the head 16 .
- the reflective surface 30 may also be formed, for example, by the optical interface of the body 16 and the over-mold 30 O materials in the region of facets 30 F.
- the blue light 22 passing through neck 28 is reflected by facets 30 F and redirected by the facets 30 F from an arrival path, supplied along and co-linear with the neck 28 , to a direction generally parallel to the bristles 18 , that is, to and through the upper surface 24 of the head 16 .
- other scattering of the blue light 22 in other directions, such as through the distal end of head 16 would provide catalytic activity in other areas of the mouth, but would require attention during design to avoid unwanted emissions of blue light from toothbrush.
- the reflection of the blue light from its arrival path from handle 12 to the direction parallel with the bristles 18 may also be accomplished by curved or flat surfaces, rather than by faceted surfaces.
- the blue light source or sources 26 A are again located in the handle 12 which illuminate the blue light emitters 20 provided in the head 16 , via a blue light conductive path, wherein the blue light conductive path comprises blue light optical conductors 26 B including, for example, blue conductive fiber optic elements or lenses, tunnel-like passages or conductive “pipes” comprising blue conductive materials and/or any combination thereof.
- the blue light 22 is then emitted via the blue light emitters 20 in the upper surface 24 , such as lenses, the ends of optical fibers or through optically conductive bristles 18 .
- the bristles 18 may comprise either conventional bristles 18 , such as found in conventional toothbrushes, and the blue light 22 may be radiated the from blue light emitters 20 located on or in the top surface 24 of the head 16 , as was discussed above.
- the blue light emitters 20 in or one the top surface 24 of the head 16 may comprise wholly, or in part, blue light emitting bristles 18 E containing a blue light conductive material.
- the blue light source of sources 26 A may be located either in the head 16 , at the bases of emitting bristles 18 E, to illuminate emitting bristles 18 E directly, or, as illustrated in FIG.
- the emitting bristles 26 E may comprise the same material as the blue light optical conductors 26 B or may be continuations of the blue light optical conductors 26 B.
- the emitting bristles 18 E may be coated or otherwise provided with a reflecting outer surface to prevent or minimize the loss or escape of the blue light 22 out through the sides of the emitting bristles 18 E, and the head 16 may likewise be provided with a reflective blue light containment surface to prevent or minimize leakage or loss of the blue light 22 .
- the blue light source or sources 26 A may be located either in the head 16 or in the handle 12 .
- blue light 22 must be conducted from the blue light source or sources 26 A located within the handle 12 to the head 16 and, in the other instance, electrical power, such as from a battery 32 , must be conducted from the handle 12 to the head 16 for supplying electrical power to the blue light source or sources 26 A.
- electrical power such as from a battery 32
- the neck 28 which is formed between the head 16 and the handle 12 may form a disconnectable junction or connection 34 between the head 16 and the handle 12 to allow the head 16 to be removed from the handle 16 .
- This is a common feature in many conventional toothbrushes, particularly in conventional battery powered toothbrushes wherein a battery and an electric motor vibrate or rotate the toothbrush head.
- This design facilitates replacement of a worm or old head 16 with a new head 16 or a different head 16 having, for example, a different function, a different arrangement, a different type of bristles 18 and/or different blue light emitters 20 .
- the path between the blue light source or sources 26 A and the head 16 will include the appropriate blue light optical connectors 34 L, at junction 34 , to allow the optical path to be repeatedly disconnected and reconnected in a reliable manner.
- Connectors 34 L may, for example, comprise lenses, fiber optic connectors or appropriately shaped ends in those implementations wherein the optical light path comprises the material of the handle 12 and the head 16 or a tunnel passage therethrough.
- the blue light source(s) 26 A will typically be provided with electrical power from one or more batteries 32 located within an internal cavity 36 of the handle 12 and the supply of electrical power to the blue light source or sources 26 A will typically be controlled by a switch 38 , e.g., a “on/off” switch, located at an appropriate position on the handle 12 .
- the circuitry will further include leads 32 L running from the handle 12 and through the neck to the head 16 and the leads 32 L will typically include appropriate electrical connectors 34 L at junction 34 which facilitate repeated disconnection and reconnection in a reliable manner.
- batteries 32 may be of any type meeting the power, storage and/or size requirements while still being small enough to reside in within the handle 12 and to provide the necessary levels of current to the blue light sources 20 for the required duration, such a NiCad, NiMiH, lithium ion, or lithium polymer batteries which typically may be rechargeable by electrical current supplied from a wall socket.
- the handle 12 will typically also include a charging circuit 32 C that can be connected to a direct or indirect source of electrical current supplied from a conventional wall socket, such as by a connector or by an induction coupling device.
- An active and passive interlock system will be employed to prevent normal operation during battery recharge.
- This interlock system may consist of mechanical keying of electrical connections and or electronic control of the toothbrush electronics by the charging circuit. It should also be noted that advances in battery technology may allow one or more batteries 32 to be located within the head 16 to facilitate the use of interchangeable heads 16 , with the corresponding connections for the switch 38 and the recharging circuits 32 C passing through the neck 15 to the handle 12 .
- the power source or batteries may be AA or AAA alkaline, lithium, or carbon zinc batteries which are commercially available and readily replaceable by the user of the toothbrush.
- the toothbrush 10 will typically further include a control circuitry 38 which will typically be located in the handle 12 and normally include functions such as a timer circuitry, which times the duration(s) of use of the toothbrush 10 while brushing, an on/off duty cycle of the blue light source or sources 26 A, a replace battery indicator, and so on.
- the control circuitry 38 may also include blue light source 26 A control circuitry, which may be connected with one or more sensors 40 S, located in the head 16 , for detecting when the head 16 is actually located within a user's mouth, thereby reducing the possibility of the blue light being inadvertently emitted except when the toothbrush is actually located within the mouth of the user.
- the Sensor(s) 40 S could include, for example, sensors for measuring or detecting conductivity, temperature, ambient light, or some other parameter indicating that the head 16 is in the mouth of a user, and the handle 12 may include a sensor for sensing the warmth or pressure of the user's hand before the blue light source or sources 20 can be activated.
- the toothbrush 10 may further include a motor (not shown) which moves, vibrates and/or rotates the head 16 in the manner of conventional powered toothbrushes, which may in turn effect the arrangements for supplying the blue light 22 to the blue light emitters 20 in as much as the mechanical structure between the handle 12 and the head 16 in such toothbrushes includes a moving mechanical joint.
- a motor not shown
- the provision of the replaceable head 16 permits the use of other forms of blue light emitting heads 16 containing blue light emitters 20 as described herein above, but shaped for other purposes than specifically as a toothbrush, such as a wand specifically designed and/or intended for blue light irradiation of a photocatalytic agent distributed on the surfaces of the teeth and the gums.
- the head 16 may be designed to hold and manipulate flossing thread or string, thereby allowing flossing to be carried out at the same time as a blue light photocatalytic process.
Abstract
A photocatalysis process toothbrush comprising a handle with a grip at a proximal end and a head at a distal end thereof. The head has at least one group of bristles and at least one blue light emitter is provided on an upper surface of the head for emitting blue light in a direction generally parallel to the bristles. At least one blue light source is provided for radiating blue light, in a wavelength band between 420 nm to 480 nm, and a power source is provided for energizing the at least one blue light source. The blue light is at least one of modulated emission with an average optical output power level of less than 5 watts.
Description
- This application is related to and claims benefit of U.S. Provisional Patent Application No. 60/872,761 filed on Dec. 4, 2006 and entitled “TOOTH BRUSH WITH BLUE LIGHT SOURCE” and such teaching and disclosure is hereby incorporated by reference.
- The present invention relates to dental hygiene and, in particular, to a toothbrush which emits radiation, in the near ultraviolet region of the electromagnetic spectrum, in order to oxidize and destroy potentially harmful bacteria and/or other contaminants or compounds contained within the mouth and also activate a photo catalyst that may be deposited on the teeth and the gums of the person utilizing the toothbrush during normal brushing.
- The use of photocatalysis in dental hygiene processes is well established and stems from processes for purifying gases and liquids and for controlling bacteria and other microorganisms in gases and liquids and on the surfaces of solid objects. In general, photocatalysis methods involve the photoexcitation of photocatalytic compounds, for example, catalytic n-type semiconductor particles such as TiO2 particles, with ultraviolet (UV) light to activate the photocatalyst, which then participates in reduction/oxidation reactions with matter adsorbed to or in the near vicinity of the surface of the particles. The reduction/oxidation reactions produce highly reactive hydroxyl radicals which oxidize and destroy bacteria and organic compounds in the gas or liquid or on the surface(s) being treated, such as bacteria and other organic substances associated with, for example, tooth decay, gum disease, denture stomatitis and halitosis/malodor.
- In the past, photocatalysis methods have generally only been performed in a dentist's offices by either a dentist or a dental hygienist using a specialized UV laser(s) or some other optical device(s) which emits a controllable, directed beam of UV light. More recently, however, there have been proposals to manufacture and sell UV photocatalysis devices to the general public, e.g., a toothbrush containing a UV light radiating device, together with toothpastes and/or mouthwashes containing photocatalytic particles, such as TiO2. In such toothbrushes, the UV light emitted by a UV laser diode, for example, passes through a light guide to the end of the toothbrush which brushes the teeth where this light is emitted into the user's mouth by, for example, lenses implanted among the bristles or through fiber optic bristles that form at least part of the brush bristles. The bristles mechanically facilitate removal of plaque and/or other organic materials from the teeth and the gums during brushing, similar to brushing with a conventional toothbrush, while the UV light is emitted directly to illuminate photocatalytic particles distributed on the surfaces of the teeth and the gums, thereby providing both a conventional cleaning mechanism as well as a photocatalytic cleaning mechanism.
- The currently UV photocatalytic toothbrushes which are marketed to consumers, however, have a number of significant problems, not the least being the potential hazards associated with such devices. For example, in the generally preferred wavelength range of 280 mm to 400 mm, UV light at any power level is typically capable of damaging human skin including the tissue of human eyes. Compounding this problem is the fact that UV light within this wavelength range is nearly invisible to a user or patient, so that it is difficult to determine where the emitted UV beam is directed or aimed. In addition, the duration of irradiation of the catalytic particles, at any particular location within the mouth, is typically very short during the normal toothbrushing process, thus requiring higher power levels of UV radiation in order to obtain effective catalytic reactions. This problem is further compounded by the normal deterioration of the light transmission capability of the brush end elements, such as the lenses and the fiber optic elements, over time. Higher emitted power levels are generally called for in order to achieve satisfactory performance.
- Up until now it is in fact the potential hazards of UV radiation that has limited the use of the UV dental hygiene processes to dentists and oral hygienists and the practical application of these methods to consumer toothbrushes and devices accordingly faces significant hurdles. For example, all medical or dental devices emitting ultraviolet light, and in particular within the wavelength range of 280 mm to 400 mm, are under Food and Drug Administration (FDA) control and licensing. In addition, all laser devices emitting coherent radiation of 1 milliwatt or more in the visible wavelengths, and all devices emitting laser radiation at any power level in the non-visible wavelengths, such as the UV and IR wavelengths, are presently prohibited from being sold to the general public.
- The present invention, however, provides a solution to the above described as well as other related problems associated with the prior art products and methods.
- Wherefore, it is an object of the present invention to overcome the above mentioned shortcomings and drawbacks associated with the prior art.
- A primary object of the invention is to provide a toothbrush which emits radiation, in the near ultraviolet region of the electromagnetic spectrum, to oxidize and destroy potentially harmful bacteria and/or other contaminants or compounds contained within the mouth.
- Another object of the invention is to provide a toothbrush that will activate a photo catalyst deposited on the teeth and the gums of the person utilizing the toothbrush during normal brushing.
- A further object of the invention is to provide a toothbrush which emits blue light within the 420 nm to 480 nm wavelength band, of the electromagnetic spectrum to avoid the normal hazards associated with using UV radiation as well as the corresponding FDA restrictions.
- Yet another object of the invention is to provide a toothbrush in which the radiated blue light emissions may be amplitude modulated from 0% to 100% at a frequency of between about two (2) and about two hundred (200) Hertz, more preferably between about 6 and about 60 Hertz and most preferably between about 10 and about 30 Hertz, with an average optical output power level of less than 5 watts.
- A still further object of the invention is to provide a toothbrush which is relatively inexpensive to manufacture which has a power source that is light weight and can be readily recharged or replaced as needed.
- As used herein, the term “average optical output power level” means that the optical output power may briefly exceed 5 watts on modulation peeks how ever the total integrated power level over a time period of 1 second will not exceed 5 watts.
- The invention will now be described, by way of example, with reference to the accompanying drawings in which:
-
FIG. 1 is a diagrammatic perspective view of a toothbrush according with the teachings of the present invention; -
FIG. 2A is a diagrammatic transverse cross sectional side view of the toothbrush ofFIG. 1 ; -
FIG. 2B is a diagrammatic transverse cross sectional side view of the toothbrush ofFIG. 1 ; -
FIG. 3A is an enlarged diagrammatic side elevational view of a brush head with the blue light source extending further away from the base of the head, then the embodiments ofFIGS. 2A and 2B , so that the light is emitted adjacent the free ends of the bristles of the toothbrush; -
FIG. 3B is a diagrammatic transverse cross sectional side view of an alternative embodiment of a toothbrush which comprises a handle having a removal brush head; -
FIG. 3C is a diagrammatic transverse cross sectional side view of an alternative embodiment of a toothbrush in which the handle is integral with the brush head; -
FIG. 3D is a diagrammatic enlarged view of the brush head ofFIG. 3C ; -
FIG. 4A is a diagrammatic enlarged view of an alternative embodiment of the brush head in which each individual blue light source is associated with a group of bristles attached to the brush head to supply the blue light along the length of the bristles; and -
FIG. 4B is a diagrammatic enlarged view of a further embodiment of a brush head have each blue light source associated with a group of bristles attached to the brush head. - Turning now to
FIG. 1 , a diagrammatic representation of atoothbrush 10, according to the present invention, is shown. As illustrated therein, thetoothbrush 10 includes is includes ahandle 12 having a grip 14 at its proximal end to be held in the user's hand while using thetoothbrush 10 and abrush head 16, typically including one or more groups ofbristles 18, located at the distal or working end of thehandle 12. As also illustrated inFIG. 1 , thehead 16 further includes one or moreblue light emitters 20 that emitblue light 22 in the 450 nm +/−30 nm (nanometer) wavelength band, that is, in the wavelengths between 420 nm and 480 nm and at an average power level of less than 5 watts. Preferably the blue light has an average power level of between about 0.25 and about 1 watt and more preferably an average power level of between about 0.5 and about 0.95 watts. - In some applications, the blue light output from the
emitters 20 may comprise solely a continuous emission of blue light having a combined power level of less than 5 watts, while in other applications the blue light output from theemitters 20 may comprise a modulated blue light emission having a frequency of between about two (2) and about two hundred (200) Hertz, more preferably between about 6 and about 60 Hertz and most preferably between about 10 and about 30 Hertz, having an average combined power level of less than 5 watts. For other applications, the blue light output from theemitters 20 may comprise a first blue light component which is a continuous emission of blue light and a second blue light component which is a pulsed blue light emission at a frequency typically between two (2) and two hundred (200) Hertz a few Hertz and a few hundred Hertz, more preferably between about 6 and about 60 Hertz and most preferably between about 10 and about 30 Hertz. For such combined continuous and pulsed blue light emission, the combined total emission must not exceed an average output which is greater that 5 watts. It is to be appreciated that the 420 nm to 480 nm wavelength band is within the visible “blue light” portion of the electromagnetic spectrum and is, therefore, below the UV light spectrum normally employed during conventional dental hygiene processes conventionally carried out by dentists and dental hygienist, thereby avoiding the normal hazards associated with using UV radiation as well as the corresponding FDA restrictions. - The presently preferred photocatalytic agents, for use with radiation within the 420 nm to 480 nm “blue light” band include, for example, modified TiO2 semiconductor type materials and possibly other catalytic n-type semiconductor particles as well as various organic dyes already known in the art as being photocatalytically responsive to blue light radiation.
- As illustrated in
FIGS. 1 , 2A, 3A and 3B and as will be described further in the following description, the blue light emitters 20 emitblue light 22 in a direction generally perpendicular to anupper surface 24 of thehead 16 thereby to radiate theblue light 22 into the mouth cavity of the person brushing his or her teeth, that is, the blue light is generally directed toward the teeth, the gums, and the tongue, being contacted by thebristles 18 as the toothbrush is used to brush the teeth. Theblue light emitters 20 may comprise one or moreblue light sources 26A, such as blue light emitting diodes or blue light emitting organic light emitting diodes, or any other type of blue light emitting device located either on, within or partially recessed within theupper surface 24 of thehead 16 to facilitate directly emitting theblue light 22. Alternatively, the blue light source(s) 26A may be located within the body of thehead 16 or withinhandle 12 with theblue light 22 being conducted along the handle and/or body to theblue light emitters 20 where the blue light is finally emitted. One or more internal passages or light conductive elements, such as reflective surfaces, blue conductive fiber optics, lenses and/or any combination thereof are provided in the handle and/or body to facilitate transmission of the blue light to theblue light emitters 20. In such embodiments of atoothbrush 10, the blue light source orsources 26A will be described or defined as being located contiguous to thehead 16, such as at the top surface 19 ofhead 16 or within the body ofhead 16, and it should be noted that for purposes of the present descriptions, the term contiguous is taken as meaning “in physical contact with” or “near, next to, or adjacent”. - In other embodiments, such as is illustrated in
FIGS. 2B , 3C and 3D, the blue light source orsources 26A may be located non-contiguously withhead 16, such as inhandle 12, with theblue light 22 being conducted along the handle to bluelight emitters 20 located within thehead 16 by means of blue lightoptical conductors 26B comprising, for example, of blue conductive fiber optic elements or lenses, reflective surfaces, passages or conductive “pipes” comprising blue conductive materials, and/or any combination thereof, which form a one or more paths that conduct the blue light 22 from the blue light source orsources 26A to theblue light emitters 20 where the light is emitted. - For example, one or more blue
light sources 26A may be located inhandle 12 at a position just below aneck 28, formed at a junction between thehandle 12 and thehead 16. According to one exemplary embodiment, such as illustrated inFIGS. 3C and 3D , theneck 28, thehead 16 and possibly portions of thehandle 12 are constructed, for example, of a blue transparent material or with one or more blue transparent passage(s) or blue light conductive “pipe” which facilitate passage of theblue light 22 through theneck 28 to thehead 16 and thereafter radiated from theblue light emitters 20. In the embodiment illustrated inFIGS. 3C and 3D , the portions of theneck 28 through whichblue light 22 is transmitted comprises a suitable blue transparent material, as does the body of thehead 16. The interior ofhead 16 includes a bluereflective surface 30 formed asfacets 30F wherein the blue light reflective properties ofreflective surface 30 is formed, for example, by a coating applied at least between the surfaces offacets 30F and an over-mold 30O of a different material forming the back regions of thehead 16. Thereflective surface 30 may also be formed, for example, by the optical interface of thebody 16 and the over-mold 30O materials in the region offacets 30F. - As indicated in
FIGS. 3C and 3D , theblue light 22 passing throughneck 28 is reflected byfacets 30F and redirected by thefacets 30F from an arrival path, supplied along and co-linear with theneck 28, to a direction generally parallel to thebristles 18, that is, to and through theupper surface 24 of thehead 16. It should be noted with regard to this embodiment that other scattering of theblue light 22 in other directions, such as through the distal end ofhead 16, would provide catalytic activity in other areas of the mouth, but would require attention during design to avoid unwanted emissions of blue light from toothbrush. - It will be recognized that the reflection of the blue light from its arrival path from
handle 12 to the direction parallel with thebristles 18 may also be accomplished by curved or flat surfaces, rather than by faceted surfaces. - In an alternate embodiment, as illustrated in
FIG. 2B , the blue light source orsources 26A are again located in thehandle 12 which illuminate theblue light emitters 20 provided in thehead 16, via a blue light conductive path, wherein the blue light conductive path comprises blue lightoptical conductors 26B including, for example, blue conductive fiber optic elements or lenses, tunnel-like passages or conductive “pipes” comprising blue conductive materials and/or any combination thereof. Theblue light 22 is then emitted via theblue light emitters 20 in theupper surface 24, such as lenses, the ends of optical fibers or through optically conductive bristles 18. - Turning now to the
bristles 18, it has been described above that thebristles 18 may comprise eitherconventional bristles 18, such as found in conventional toothbrushes, and theblue light 22 may be radiated the from bluelight emitters 20 located on or in thetop surface 24 of thehead 16, as was discussed above. In other embodiments, however, theblue light emitters 20 in or one thetop surface 24 of thehead 16 may comprise wholly, or in part, bluelight emitting bristles 18E containing a blue light conductive material. As illustrated inFIG. 4A , the blue light source ofsources 26A may be located either in thehead 16, at the bases of emitting bristles 18E, to illuminate emittingbristles 18E directly, or, as illustrated inFIG. 4B , may be located inhandle 12 with theblue light 22 being conducted to the bases of the emittingbristles 28E by blue lightoptical conductors 26B. In the latter case, the emitting bristles 26E may comprise the same material as the blue lightoptical conductors 26B or may be continuations of the blue lightoptical conductors 26B. It should also be noted that the emittingbristles 18E may be coated or otherwise provided with a reflecting outer surface to prevent or minimize the loss or escape of theblue light 22 out through the sides of the emitting bristles 18E, and thehead 16 may likewise be provided with a reflective blue light containment surface to prevent or minimize leakage or loss of theblue light 22. - Next, it will be noted from the above descriptions of the
toothbrush 10 that while theblue light emitters 20 are located in or on thehead 16, the blue light source orsources 26A may be located either in thehead 16 or in thehandle 12. In one instance, therefore,blue light 22 must be conducted from the blue light source orsources 26A located within thehandle 12 to thehead 16 and, in the other instance, electrical power, such as from abattery 32, must be conducted from thehandle 12 to thehead 16 for supplying electrical power to the blue light source orsources 26A. It must also be noted, however, that in certain implementations, such as those illustrated inFIGS. 2B , 3C and 3D for example, theneck 28 which is formed between thehead 16 and thehandle 12 may form a disconnectable junction orconnection 34 between thehead 16 and thehandle 12 to allow thehead 16 to be removed from thehandle 16. This is a common feature in many conventional toothbrushes, particularly in conventional battery powered toothbrushes wherein a battery and an electric motor vibrate or rotate the toothbrush head. This design facilitates replacement of a worm orold head 16 with anew head 16 or adifferent head 16 having, for example, a different function, a different arrangement, a different type ofbristles 18 and/or different bluelight emitters 20. - In those instances wherein the blue light source or
sources 26A are located inhandle 12, the path between the blue light source orsources 26A and thehead 16 will include the appropriate blue lightoptical connectors 34L, atjunction 34, to allow the optical path to be repeatedly disconnected and reconnected in a reliable manner.Connectors 34L may, for example, comprise lenses, fiber optic connectors or appropriately shaped ends in those implementations wherein the optical light path comprises the material of thehandle 12 and thehead 16 or a tunnel passage therethrough. - In those instances wherein the blue light source or
sources 26A are located in thehead 16, the blue light source(s) 26A will typically be provided with electrical power from one ormore batteries 32 located within aninternal cavity 36 of thehandle 12 and the supply of electrical power to the blue light source orsources 26A will typically be controlled by aswitch 38, e.g., a “on/off” switch, located at an appropriate position on thehandle 12. The circuitry will further includeleads 32L running from thehandle 12 and through the neck to thehead 16 and theleads 32L will typically include appropriateelectrical connectors 34L atjunction 34 which facilitate repeated disconnection and reconnection in a reliable manner. - In this regard, it should be noted that
batteries 32 may be of any type meeting the power, storage and/or size requirements while still being small enough to reside in within thehandle 12 and to provide the necessary levels of current to the bluelight sources 20 for the required duration, such a NiCad, NiMiH, lithium ion, or lithium polymer batteries which typically may be rechargeable by electrical current supplied from a wall socket. For this reason, thehandle 12 will typically also include a charging circuit 32C that can be connected to a direct or indirect source of electrical current supplied from a conventional wall socket, such as by a connector or by an induction coupling device. An active and passive interlock system will be employed to prevent normal operation during battery recharge. This interlock system may consist of mechanical keying of electrical connections and or electronic control of the toothbrush electronics by the charging circuit. It should also be noted that advances in battery technology may allow one ormore batteries 32 to be located within thehead 16 to facilitate the use ofinterchangeable heads 16, with the corresponding connections for theswitch 38 and the recharging circuits 32C passing through the neck 15 to thehandle 12. As an alternative source, the power source or batteries may be AA or AAA alkaline, lithium, or carbon zinc batteries which are commercially available and readily replaceable by the user of the toothbrush. - The
toothbrush 10, according to the present invention, will typically further include acontrol circuitry 38 which will typically be located in thehandle 12 and normally include functions such as a timer circuitry, which times the duration(s) of use of thetoothbrush 10 while brushing, an on/off duty cycle of the blue light source orsources 26A, a replace battery indicator, and so on. Thecontrol circuitry 38 may also include bluelight source 26A control circuitry, which may be connected with one or more sensors 40S, located in thehead 16, for detecting when thehead 16 is actually located within a user's mouth, thereby reducing the possibility of the blue light being inadvertently emitted except when the toothbrush is actually located within the mouth of the user. The Sensor(s) 40S could include, for example, sensors for measuring or detecting conductivity, temperature, ambient light, or some other parameter indicating that thehead 16 is in the mouth of a user, and thehandle 12 may include a sensor for sensing the warmth or pressure of the user's hand before the blue light source orsources 20 can be activated. - It should also be noted that the
toothbrush 10 may further include a motor (not shown) which moves, vibrates and/or rotates thehead 16 in the manner of conventional powered toothbrushes, which may in turn effect the arrangements for supplying theblue light 22 to theblue light emitters 20 in as much as the mechanical structure between thehandle 12 and thehead 16 in such toothbrushes includes a moving mechanical joint. In such implementations, therefore, it may be preferable to place the blue light source orsources 26A in thehandle 12 and communicate theblue light 22 to theblue light emitters 20 in thehead 16 by optical paths that are typically less affected by moving mechanical joints than are electrical conductors. - Lastly, it should be noted that the provision of the
replaceable head 16 permits the use of other forms of bluelight emitting heads 16 containing bluelight emitters 20 as described herein above, but shaped for other purposes than specifically as a toothbrush, such as a wand specifically designed and/or intended for blue light irradiation of a photocatalytic agent distributed on the surfaces of the teeth and the gums. In a further example of an alternate arrangement of thehead 16, thehead 16 may be designed to hold and manipulate flossing thread or string, thereby allowing flossing to be carried out at the same time as a blue light photocatalytic process. - It will be appreciated that various changes and/or modifications to the present invention may be made by those of ordinary skill in the art without departing from the spirit and scope of the present invention which is set out in more particular detail in the appended claims. Furthermore, those of ordinary skill in the art will appreciate that the foregoing description is supplied by way of example only, and is not intended to be limiting of the invention as described in the appended claims.
Claims (20)
1. A photocatalysis process toothbrush comprising:
a handle having a grip at a proximal end and a head at a distal end thereof;
the head including at least one group of bristles;
the head having at least one blue light emitter for emitting blue light in a direction generally parallel to the at least one group of bristles;
a power source for energizing the at least one blue light source; and
at least one blue light source for radiating blue light in a wavelength band between 420 nm to 480 nm.
2. The photocatalysis process toothbrush of claim 1 , wherein the at least one blue light source is located contiguously with the head.
3. The photocatalysis process toothbrush of claim 1 , wherein the at least one blue light source is located in the handler and the toothbrush further includes
at least one blue light conductor for conducting the blue light along the handle from the at least one blue light source to the at least one blue light emitter.
4. The photocatalysis process toothbrush of claim 3 , wherein the at least one blue light conductor includes at least one of:
a blue light conducting fiber;
a blue light conductive material forming at least the head of the toothbrush;
a tunnel passage;
a reflective path; and
at least one blue light lens.
5. The photocatalysis process toothbrush of claim 3 , wherein the head further includes at least one blue light reflecting surface for redirecting the blue light from an arrival path from the at least one blue light source in the handle in a direction generally parallel to the at least one group of bristles.
6. The photocatalysis process toothbrush of claim 1 , wherein the blue light emitters include at least one group of blue light conductive bristles coupled to the at least one blue light source for emitting the blue light from remote ends of the at least one group of blue light conductive bristles.
7. The photocatalysis process toothbrush of claim 1 , further comprising a neck having a connectable junction joining the handle and the head, wherein the connectable junction includes one of:
a blue light optical connector for forming a blue light transmission path between the at least one blue light source in the handle and the at least one blue light emitter located on the upper surface of the head, and
an electrical connector for forming an electrical connection between the power source in the handle and the at least one blue light source contiguous with the head.
8. The photocatalysis process toothbrush of claim 1 , wherein the blue light radiated by the at least one blue light source has an average power level of less than 1 watt.
9. The photocatalysis process toothbrush of claim 8 , wherein the blue light radiated by the at least one blue light source is a continuous blue light emission.
10. The photocatalysis process toothbrush of claim 8 , wherein the blue light radiated by the at least one blue light source is a modulated blue light emission.
11. The photocatalysis process toothbrush of claim 10 , wherein the modulated blue light emission is at a frequency of between about 6 and about 60 Hertz.
12. The photocatalysis process toothbrush of claim 1 , wherein the blue light radiated by the at least one blue light source comprises a combination of a continuous blue light emission and a modulated blue light emission and the combination blue light emission has an average power level of less than 5 watts.
13. The photocatalysis process toothbrush of claim 1 , wherein the photocatalytic agent is one of a modified TiO2 semiconductor type materials, a catalytic n-type semiconductor material, and an organic dye which photocatalytically responsive to blue light radiation.
14. The photocatalysis process toothbrush of claim 1 , wherein the power source is one of a non-rechargeable battery and a rechargeable battery.
15. A photocatalysis process toothbrush comprising:
a handle having a grip at a proximal end and a head at a distal end thereof;
the head including at least one group of bristles;
the head having at least one blue light emitter for emitting blue light in a direction generally parallel to the at least one group of bristles;
a power source for energizing the at least one blue light source;
at least one blue light source modulated from 0% to 100% at a frequency of between a two (2) and two hundred (200) Hertz with an average optical output power level of less than 5 watts for radiating blue light in a wavelength band between 420 nm to 480 nm; and
the at least one blue light source is located in the handle, and the handle includes at least one blue light conductor for conducting the blue light along the handle from the at least one blue light source to the at least one blue light emitter.
16. The photocatalysis process toothbrush of claim 15 , wherein the at least one blue light conductor includes at least one of:
a blue light conducting fiber;
a blue light conductive material forming at least the head of the toothbrush;
a tunnel passage;
a reflective path; and
at least one blue light lens.
17. The photocatalysis process toothbrush of claim 15 , wherein the blue light emitters include at least one group of blue light conductive bristles coupled to the at least one blue light source for emitting the blue light from remote ends of the at least one group of blue light conductive bristles.
18. The photocatalysis process toothbrush of claim 15 , wherein the head further includes at least one blue light reflecting surface for redirecting the blue light from an arrival path from the at least one blue light source in the handle in a direction generally parallel to the at least one group of bristles.
19. The photocatalysis process toothbrush of claim 15 , wherein the blue light radiated by the at least one blue light source comprises a blue light emission that may be modulated from 0% to 100% at a frequency of between two (2) and two hundred (200) Hertz with an average optical output power level of less than 5 watts.
20. A method of forming a toothbrush with a photocatalysis process toothbrush the method comprising the steps of:
providing a handle with a grip at a proximal end and a head at a distal end thereof;
mounting at least one group of bristles to the head;
locating at least one blue light emitter so as to emit blue light in a direction generally parallel to the at least one group of bristles;
energizing the at least one blue light source with a power source;
locating the at least one blue light source in the handle, and the handle includes at least one blue light conductor for conducting the blue light along the handle from the at least one blue light source to the at least one blue light emitter; and
radiating blue light, within a wavelength band between 420 nm to 480 nm and having an average power level of less than 5 watts, from at least one blue light source for and the blue light radiated by the at least one blue light source is one of an amplitude modulated emission from 0% to 100% at a frequency of between two (2) and two hundred (200) Hertz.
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US12/252,876 US20090083924A1 (en) | 2006-12-04 | 2008-10-16 | Photocatalysis process toothbrush |
US13/195,362 US20110296643A1 (en) | 2006-12-04 | 2011-08-01 | Photocatalysis process toothbrush |
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