CA2364109A1

CA2364109A1 - A disposable toothbrush

Info

Publication number: CA2364109A1
Application number: CA002364109A
Authority: CA
Inventors: Bruce Alan Sargent
Original assignee: Individual
Current assignee: TRI-CONCEPTS Pty Ltd
Priority date: 1999-03-10
Filing date: 1999-11-24
Publication date: 2000-09-14
Also published as: WO2000053053A1; AU1172400A; JP2002537925A; CN1352534A; NZ514670A; EP1164891A1

Abstract

This invention relates to a compact disposable toothbrush in combination wit h a toothpaste dispenser for use by travellers and persons suffering from oral diseases. The toothbrush comprises a toothbrush head (12) which included a base (22), bristles (24) and a cap (36). The cap (36) contains toothpaste behind a sealed membrane (42), or within a sachet (not shown). In use, the c ap is pressed laterally relative to the head (22), pointed ridges (32) perforat e the membrane (42) and the toothpaste is caused to flow through an aperture (34) in the base (22) to the bristles (24). The handle (14) of the toothbrus h includes a first cavity (16) containing a supply of dental floss and a secon d cavity (18) containing a supply of mouthwash. According to a preferred embodiment of the invention the toothpaste and mouthwash contain active ingredients for treating oral diseases.

Description

17-04-2001 CA 02364109 2001-09-07 IB 00990187:
APO - ~C
~ 7, 0~, 200i A DISPOSABLE TOOTHBRUSH y oa BACKGROUND OF THE INVENTION
THIS invention relates to a toothbrush, more particularly to a disposable toothbrush which includes a toothpaste dispenser.
Disposable toothbrushes are used particularly by travellers to brush their teeth in toilet facilities along the route on which they are travelling. It is convenient for the toothbrush to be in combination with a toothpaste dispenser and also to be disposable, so that the traveller can easily buy a toothbrush or be given one. use it once, and then throw it away. Another use for disposable toothbrushes is in treating oral diseases. Persons afflicted with oral diseases can very often only use a toothbrush once as subsequent use of the toothbrush can re-infect the person or introduce bacteria into the mouth of the person.
A disposable toothbrush is disclosed in United States Patent No. 5,865,19.
In this document toothpaste is contained within the brush head of the toothbrush, in a storage reservoir behind the bristles of the toothbrush. The toothpaste is applied to bristles, via apertures through the brush head, by depressing the storage reservoir. A problem with this toothbrush is that the toothpaste within the reservoir is not sealed from the atmosphere and the toothbrush must be packaged in a specially sealed container. As the container is likely to contain air, the toothpaste within the reservoir may dry out, or may become contaminated during the packaging process.
It is an object of this invention to provide an improved compact disposable toothbrush in combination with a toothpaste dispenser.
AMENDED SHEET

17-04-2001 CA 02364109 2001-09-07 IB 00990187:
SUMMARY OF THE INVENTION
According to the invention there is provided a toothbrush and toothpaste dispenser unit comprising:
a longitudinally extending brush head attached to a brush handle;
a plurality of bristles extending from the brush head;
a plunger cap defining a supply cavity containing a supply of toothpaste in the brush head, the plunger cap being movable laterally relative to the brush head from an inoperative position to an operative position;
at least one aperture extending through the brush head, bringing the supply cavity into communication with the bristles;
characterized in that the brush head includes a perforatable membrane for sealing the supply of toothpaste from the atmosphere and perforating means for perforating the membrane when the plunger cap is moved from the inoperative position to the operative position so that the toothpaste may be forced by the plunger cap, via the at least one aperture in the brush head, to the bristles.
The supply of toothpaste may be contained within a sachet within the plunger cap.
Advantageously, the supply of toothpaste contained within the supply cavity in the cap is sealed from the atmosphere by a perforatable membrane which is adhered to an opening defined by the plunger cap.
Preferably, the perforatable membrane is a plastics film or a foil.
AMENDED SHEET

17-04-2001 CA 02364109 2001-09-07 IB 00990187:

The perforating means is preferably a pointed ridge or spike formed integrally with the brush head.
Advantageously, the perforating means is arranged to substantially fill the supply cavity in the plunger cap, when the plunger cap is in the operative position.
The brush head may include locking means for locking the plunger cap in the operative position.
AMENDED SHEET

WO 00/53053 _ -4- PCT/IB99/01875 Typically, the perforating means is a pointed ridge or spike formed integrally with the brush head.
Advantageously, the brush head includes locking means for locking the plunger in the second operative position.
The brush handle preferably includes a first cavity for storing a supply of dental floss and also a second cavity for storing a supply of mouthwash.
Preferably, the toothpaste includes an active ingredient for the treatment of an oral disease, such as gingivitis, perdontitis, carries, calculus and dentinal hypersensitivity.
Advantageously, the mouthwash also includes an active ingredient for the treatment of an oral disease, such as gingivitis, perdontitis, carries, calculus and dentinal hypersensitivity.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is an exploded side cross-sectional view of a disposable toothbrush according to a first embodiment of the invention;
Figure 2 is a cross-section view of Figure 1 through the line 2-2;
Figure 3 is a cross-sectional side view of the disposable toothbrush of Figure 1 in an inoperative position;
Figure 4 is a cross-sectional side view of disposable toothbrush of Figure 1 in an operative position;

Figure 5 is a cross-sectional side view of a disposable toothbrush according to a second embodiment of the invention;
Figure 6 is a pictorial view of a sachet containing toothpaste for the disposable toothbrush shown in Figure S;
Figure 7 is cross-sectional side view of the disposable toothbrush shown in Figure 5, in an inoperative position; and Figure 8 is a cross-sectional side view of the disposable toothbrush of Figure 5, in an operative position.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to Figure 1, a disposable toothbrush 10 according to a first embodiment of the invention includes a longitudinally extending brush head shown generally by the numeral 12 with a brush handle 14. The brush handle 14 is made of a ridged plastics material such as polypropylene or styrene. The brush handle 14 includes a first cavity 16 for retaining a supply of dental floss and a second cavity 18 for containing a supply of mouthwash. A flexible removable end cap 20 is provided for closing the cavity 18.
Referring to Figures 1 and 2, the brush head 12 includes a base 22 formed integrally with the handle 14 and is made from the same material as the handle. The base 22 has an outer surface 26 to which is secured a number of bristles 24. The bristles 24 are arranged to lie substantially perpendicular relative to the surface 26. The base 22 also defines a cavity 28 having a floor 30. Projections, in the form of pointed ridges 32 are formed integrally with and extend from the floor 30. An aperture 34 extends through the WO 00/53053 - _6- PCT/IB99/01875 brush head 12, linking the cavity 28 to the bristles 24 communicatively.
The brush head 12 further includes a plunger cap 36 which is made from a flexible material such as low density polyethylene or more preferably thermoplastic elastomer (TPE). The plunger cap 36 defines a supply cavity 38 with an opening 40 into the supply cavity 38. The opening 40 is sealed closed by a perforatable membrane 42 which is made from a plastics film or foil. A single supply of toothpaste (shown by stippling) is contained within the supply cavity 38, behind the membrane 42. The cap 36 further includes a peripheral projection 44 which is engageable with first and second projections 46 and 48 on an inner side wall 49 of the cavity 28 in the base 22. The projection 44 is also arranged to form a seal with the inner side wall 49 of the cavity 28.
Referring to Figure 3, the cap 36 is pressed onto the base 22 so that the projections 44 on the cap 36 engage with the first projections 46 on the side wall 49 of the base 22, thereby locking the cap 36 onto the base 22. The cap 36 is now in a first inoperative position, with the toothbrush 10 ready for sale or storage. The membrane 42 seals the supply of toothpaste (shown by stippling) from the atmosphere and ensures that the toothpaste is not contaminated by germs and that it does not dry out.
Referring to Figure 4, in use, the cap 36 is pressed, like a plunger, from the first inoperative position shown in Figure 3, laterally relative to the brush head 12, to the second operative position shown in Figure 4. During the lateral movement, the pointed ridges 32 perforate the membrane 42 and toothpaste (shown by stippling) is forced through the aperture 34 and onto the bristles 24. The peripheral projection 44 engages sealingly with the inner side wall 49 to stop toothpaste from escaping between the cap 36 and the inner side wall 49. The flexible cap 36 also ensures that most of the toothpaste (shown by stippling) is pressed out of the supply cavity when the cap is depressed. The toothbrush may then be used by a user, with WO 00/53053 _ _~- PCT/IB99/01875 toothpaste already on the bristles. After brushing, the user may use the mouthwash to wash his/her mouth out and then may use the dental floss 48 for further cleaning of the teeth. Once in the second operative position, the peripheral projection 44 on the cap 36 engage with the second projections 48 on the base 22, locking the cap 36 in place, so that the toothbrush may only be used once.
Referring to Figure 5, according to a second embodiment of the invention, toothpaste (shown by stippling) is contained within the cap 36 within a sachet 50. Referring to Figure 6, the sachet 50 is shaped to fit within the supply cavity 38 in the cap 36 and is made from a plastics film or a foil.
Referring back to Figure 5, in this embodiment, the projections 32 shown in Figure 1 are replaced with blocks 52 which are formed integrally with the base 22 of the brush head 12. The blocks substantially fill the cavity 28 in the base 22 and support spikes 54 which are formed integrally therewith.
Referring to Figure 7, in an inoperative position, the cap 36 clips onto the base 22 in the same way as Figure 3. Toothpaste within the sachet 50 is sealed from the atmosphere, is not contaminated by germs and does not dry ollt.
Referring to Figure 8, in use, the cap 36 is pressed laterally relative to the brush head 12 from the inoperative position shown in Figure 7 to an operative position shown in Figure 8. During the lateral movement, the spikes 54 perforate the membrane of the sachet 50 and toothpaste (shown by stippling) is forced through the aperture 34 and onto the bristles 24. Again, as with the toothbrush shown in Figure 4, the cap 36 is then locked in place by the projection 48. In this embodiment the blocks 52 substantially fill the cavity 28 in the base 22, to ensure that as much toothpaste as possible is forced from the cavity 38 in the cap 36 onto the bristles 24. It will be noted _g_ that the flexible cap 36 is deformed over the spikes 54 to ensure that as much toothpaste as possible is forced onto the bristles 24.
A sachet can be used in the toothbrush shown in Figure l; and a cap with a sealed membrane could be used with the toothbrush shown in Figure 2.
The toothbrush according to the invention provides a compact and easy to operate toothbrush head which includes a toothpaste dispenser that a traveller can use once, and then throw away. In addition, the system is hygienic and the toothpaste does not dry out as it is sealed from the atmosphere during transport and storage, before use.
Another important advantage of the toothbrush according to the invention is that it can be used in health care to treat, or to assist in the treatment of, oral diseases.
The toothpaste in the cap or sachet may contain an active ingredient such as an antiseptic, antibiotic, antimicrobial, anti-fungal, analgesic, anaesthetic, anti-inflammatory or any other medicament for the treatment of an oral disease, such as a gum disease for example, gingivitis and other oral diseases such as periodontitis, caries, calculus and dentinal hypersensitivity.
A typical example would be the toothpaste sold under the trade mark Sensodyne which contains strontium chloride hexahydrate, a surface anaesthetic for treatment of dentinal hypersensitivity.
The advantage of the toothbrush according to the invention is that toothpaste containing an active ingredient is sealed from the atmosphere and this prolongs the shelf life of the active ingredient in the toothpaste which could otherwise be oxidised if exposed to oxygen. After being used once, the toothbrush is discarded. This is often necessary in treating oral diseases, as a used brush can re-infect a patient or introduce new bacteria to the patient's mouth. Also, the toothpaste supply in the brush can have a selected volume and concentration of active ingredient for the disease that is to be treated.
The mouthwash in the handle of the brush may also contain an active ingredient as mentioned above for the treatment of an oral disease, such as those mentioned above. For example, the handle could contain the mouthwash sold under the trade mark Cosordyl which contains chlorhexidine gluconate as an active ingredient which is an antibacterial.

Claims

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1. A toothbrush including:
a longitudinally extending brush head attached to a brush handle;
a plurality of bristles extending from the brush head;
a plunger cap defining a supply cavity containing a supply of toothpaste in the brush head, the plunger cap being movable laterally relative to the brush head from an inoperative position to an operative position;
at least one aperture extending through the brush head, bringing the supply cavity into communication with the bristles;
characterized in that the brush head includes a perforatable membrane for sealing the supply of toothpaste from the atmosphere and perforating means for perforating the membrane when the plunger cap is moved from the inoperative position to the operative position so that the toothpaste may be forced by the plunger cap. via the at least one aperture in the brush head, to the bristles.

2. A toothbrush according to claim 1 wherein the supply of toothpaste is contained within a sachet within the plunger cap.

3. A toothbrush according to claim 1 wherein the supply of toothpaste contained within the supply cavity in the cap is sealed from the atmosphere by a perforatable membrane which is adhered to an opening defined by the plunger cap.

4. A toothbrush according to claim 2 or 3 wherein the perforatable membrane is a plastics film or a foil.

5. A toothbrush according to any one of the preceding claims wherein the perforating means is a pointed ridge or spike formed integrally with the brush head.

6. A toothbrush according to any one of the preceding claims wherein the perforating means is arranged to substantially fill the supply cavity of the plunger cap, when the plunger cap is in the operative position.

7. A toothbrush according to any one of the preceding claims wherein the brush head includes locking means for locking the plunger cap in the operative position.