Improved oral hygiene irrigator syringe bulb

Abstract: The disclosure relates to an oral irrigator syringe bulb comprising an elastic compressible bulb (1), which may be filled with the irrigation fluid, having an opening (2); and a rigid nozzle (3) having a base portion (4) which may be sealingly fitted to said bulb opening, and a lumen (6) along the longitudinal axis thereof having a fluid outlet (7) at the upper portion thereof to which suitable irrigation means (8, 8', 8'') can be attached, and an elongate non-kinking flexible dip tube (9) accommodated therein, one end of said dip tube reaching into said lumen and the free end (10) of said dip tube being provided with a weight (11); whereby when the nozzle is fitted onto the bulb the free end of said tube extends into the bulb and is submerged in the irrigation fluid at any spatial position of the bulb.

Description: The present invention relates to a oral irrigation fluid dispensing device, which may be equipped with suitable irrigation probe device, for the delivery of medically compatible fluids into the periodontal pocket or the gingival sulcus or the interdental space. Periodontal inflammation is one of the most common diseases of the adult population. Periodontal inflammation is induced by the dental plaque, a mixture of bacteria embedded in an adhesive matrix, present on the tooth surface particularly at the interdental spaces and near the gums. The initial pathological reaction to the plaque, called gigivitis, is expressed by the doft gum tissue as redness, bleeding, swelling, bad breath and sour taste. Later, over a period of several years, the gum disease progresses and causes destruction of the tooth supporting bone, leaving a pathologic space between the tooth root and the gum. This space is the periodontal pocket. The plaque extends into the pockets, from which it cannot be removed by conventional oral hygiene methods, such as brushing and flossing. This plaque induces further damage, increasing the pocket size in depth and width, with eventual tooth loss. In addition to the gingivitis, plaque present in the interdental space also causes interproximal tooth decay. Since the implication of plaque in the development of dental diseases, the majority of plaque control devices introduced over the past decades have been developed for supragingival plaque removal. Supragingival plaque can be effectively removed by brushing and flossing, but most brushing and flossing devices are restricted by physical restraints that limit their ability to extend far enough below the gingival margin. The configuration of tooth picks, pipe cleaners, interdental brushes and other interdental cleaning aids also limits the effect of these devices on subgingival plaque. Furthermore, antiplaque agents used as mouth rinses affect only supragingival plaque unless such agents are introduced below the gingival margin with an irrigating device. Oral irrigators allow practitioners and patients access to subgingival areas in order to disrupt the plaque that proliferates at these sites. Irrigation can be defined simply as "the flushing of a specific site or area with a stream of fluid delivered by an irrigator". In 1968, the first powered oral irrigation device, WaterPik R (Teledyne WaterPik), was accepted by the American Dental Association for its ability to remove food particles and debris from interdental areas and below the gum line. This device was widely recommended, particularly for orthodontic and prosthodontic patients. However, research was unable to establish a definitive relationship between the presence of debris and periodontal disease and found no evidence that irrigation with WaterPik R could significantly reduce plaque. Subsequent research utilizing antimicrobial solutions delivered by an oral irrigator equipped with a fine probe, has helped to establish oral irrigation as a useful procedure for plaque control, especially for "site specific" therapeutic approaches that require direct delivery of antimicrobial solutions into the affected sulcus or pocket, and has expanded the usefulness of the irrigator in preventative care, beyond its application as a mechanism to simply flush away debris. Researchers of general preventive techniques, dental hygiene educators as well as various practitioners, have maintained that oral irrigation is an effective adjunctive plaque control therapy throughout the course of periodontal treatment, from initial plaque removal instruction through maintenance. Furthermore, experts gathered at the April 1991 meeting of the International Association of Dental Research in Acapulco, Mexico, agreed that the use of antimicrobial solutions applied with oral irrigation systems exhibits high promise in the site specific treatment of periodontal conditions. Irrigators designed for home care by the patient consist of a power driven pump or flexible syringe bulb and a tip. The early irrigator tips, designed for supragingival removal of debris were too large to penetrate the interdental space and gingival sulcus of patients with undisrupted gum architecture or periodontal pockets. In addition, the motor driven pumps deliver a powerful stream that causes undesirable enforcement of debris and microorganisms into the dental tissues. Subgingival irrigation devices, introduced into the dental market over the past decade, are capable of delivering medicaments directly to the site of the periodontal infection. This form of therapy can effectively remove bacterial plaque in sites inaccessible to brushing, flossing and other mechanical manipulations [a variety of available irrigation devices can be found in Dental Products Report R Europe (also published in the U.S.A.), MEDEC Dental Communications, A Division of Medical Economics Publishing Company, Inc., October 1991]. However, one of the main drawbacks of oral hygiene techniques used for arrest or prevention of periodontal diseases, particularly irrigation, is patient compliance, since the patient should maintain routine, day-by-day treatment. A great deal of the incompliance can be attributed to the non-handiness of most avalable oral irrigators. U.S. Patent No. 5,127,831, corresponding to co-pending Israel Patent Application No. 98355, discloses a novel irrigation probe, particularly suitable for use by patient. Conventional irrigation devices, like blunt, rigid metal needles, are also used for irrigation, by trained personnel [e.g. Soh, L.L., et al ., J. Clin. Periodontol. 9 : 66-74 (1982); J.G.L. Khoo and H.N. Newman, J. Periodont. Res. 18 : 607-619 (1983)]. Another dental irrigation needle is disclosed in U.S. Patent No. 4,993,941. Additionally, IMAX R Periotips R (SDI Group, Inc., IL U.S.A.) are used for in-office professional subgingival irrigation. All of the known prior art irrigation probes can be used with various pumping devices containing the irrigation fluid, which may be water or medically compatible solutions. These devices include different manual and automatic syringes, spray injectors and mechanically or electrically driven pump systems. The known pumping devices, particularly syringes, are mostly designed for in-office use by trained personnel. Another pumping device, stated to be suitable for use by patient, is sold under the name Luer Syrette R (Perio Dental, Inc., Colorado USA). This pumping device consists of a compressible bulb, which has a narrow opening, and a hollow shaft. One end of the shaft can be sealing fitted into the opening in the bulb, the other end has a luer lock for connecting the irrigation probe. This Luer Syrette R in only operable when held in an upright position. Thus, in order to irrigate lower jaw sites, or other sites which are difficult to reach, an elongate extension tube is used, connecting said luer lock with the irrigation probe, to enable the attending dentist or the patient to reach all subgingival pockets, while maintaining the Luer Syrette R in the upright position. To achieve the upright position, both hands of the user are engaged which is a drwaback since one hand should preferably be free, to push aside the lip/s or cheek/s, to expose the target site. In addition, the structure of the Luer Syrette R is rather complex, since it requires the inclusion of an anti-suction valve, preventing suction of the irrigation fluid back into the bulb when pressure on the bulb is released. Moreover, the bulb opening is narrow and the bulb is filled with the irrigation fluid by suction from a larger container. Also washing of the bulb with water between uses is achieved by suction. Evidently, the fact that the bulb can only be operated when in upright position is a major drawback, particularly when considering the anatomy of the mouth, and especially when to be used by the patient. The present invention intends to overcome the described drawbacks, essentially by providing an irrigation device which is equipped with a non-kinking weighted dip tube, which is submerged in the irrigation fluid irrespective of the spatial position in which the irrigator is held. Various fluid dispensing devices comprising a weighted dip tube assembly, some of them non-kinking tubes, which ensures that the free end of the dip tube is always submerged in the fluid to be dispensed are known. Such fluid dispensing devices are described, for example, in UK Patent Applications Nos. 902,114, 1,008,733, 2,136,057, 2,217,394 and 2,234,555, U.S. Patents Nos. 2,978,152, 3,088,680, 3,211,349, 3,490,656 and 3667655, DE 363640 and French Patent Applications Nos. 1479.528, 1565071, 2101504 and 2437246. However, none of the dispensers disclosed in these publications is intended for dental use and in all of the disclosed dispensers the container is rigid and the pressurised fluid is dispensed by aerosol means. Moreover, the prior art dispensers appear to be only suitable for one-time use and cannot be refilled. US-A-4286735 discloses a hand operated fluid and/or powder dispenser which includes a plastic squeeze container having longitudingly fluted ribs for easy collapsing. In the interior, there is carried a flexible feeding tube having an end which slides against the bottom of the container. This tube has a weighted enlarged inlet formed with a multiplicity of channels. The container is filled with fluid or powder and has a screw cap retainer in which is mounted a ball valve. This valve is moved to two limits. At an inner limit, air or atmosphere flows inwardly when the container is allowed to relax to its moulded condition. When the container is squeezed, a ball valve is moved to a closed condition whereby air pressure rapidly builds up within the container and the fluid or powder is caused to flow through the flexible tubing to a directing spout mounted on the cap portion. There is no provision for preventing ingress of fluid or other contaminating material through the spout into the container. US-A-1166036 discloses a dental appliance in the form of a chip blower which is intended for use by a dental practitioner, and not for ordinary home use. A double acting valve is provided in the stem of a nozzle and located between the nozzle and a compressible bulb. In one direction air pressure will open the valve to permit air, under pressure, to pass through the stem and out of the nozzle. When the bulb is released, the valve is closed against intake through the nozzle, but openings are provided through which air is drawn by the suction caused by the expanding bulb. The invention provides an oral irrigator fluid dispensing apparatus comprising an elastic compressible bulb having an opening and an internal cavity for holding an irrigation fluid therein such that the irrigation fluid always settles to a low region of the internal cavity within the bulb in any spatial orientation of the bulb, a rigid nozzle having a base portion to which the bulb opening is attached and a lumen having a fluid outlet at an upper portion thereof, a flexible, non-kinking tube, one end of which is being coupled to a lower portion of said lumen, the tube extending into the cavity in the bulb and having a second end being a fluid inlet end within the cavity, irrigation means coupled to said fluid outlet of said lumen for dispensing said irrigation fluid therefrom by compressing said bulb, a weight attached to the fluid inlet end of the tube within cavity with the tube being of a sufficient length and flexibility such that with the cooperation of the said weight, the fluid inlet end of the tube is maintained in said low region of the cavity to enable irrigation fluid therein to flow through the flexible tube to the nozzle regardless of the spatial orientation of said bulb, and a first one-way valve for preventing flow of air from said bulb when the bulb is compressed and permitting flow of air into the bulb during decompression; wherein the first one-way valve is positioned in communication with the outside wall of the bulb or in the nozzle for drawing air respectively through the wall of the bulb or the nozzle into the bulb, and a second one-way valve, which is separate from the first one-way valve, is accommodated within said lumen for enabling said irrigation fluid to flow from said bulb through the flexible tube, nozzle and irrigation means so as to be dispensed therefrom upon compression of said bulb and for preventing contaminated oral fluids from flowing into said cavity of said bulb by way of said irrigation means, nozzle, and flexible tube upon decompression of the bulb. The invention will be described in more detail on hand of the appended drawing, in which: Figure 1 illustrates an exploded view of an oral irrigator syringe bulb; Figure 2 illustrates a longitudinal cross-sectional view of the oral irrigator of Figure 1, but without illustrating the one way valves; Figures 3A-3D illustrate longitudinal cross-sectional views of the oral irrigator of Fig.1, in upside-down, upright, inclined and horizontal positions respectively, again without illustrating the one-way valves; and Figure 4A-4B illustrate the syringe of Fig.1 showing the one-way valves according to the invention. The present invention relates to an oral irrigator syringe bulb comprising essentially two parts: (i) an elastic compressible bulb, which may be filled with the irrigation fluid, the bulb having an opening; and (ii) a nozzle having a base portion, which may be sealingly fitted to said bulb opening, and a lumen along the longitudinal axis thereof, having a fluid outlet at one end thereof, to which suitable irrigation means, such as probes, tips or needles, can be attached, and an elongate non-kinking flexible tube accomodated within said nozzle, one end of said dip tube reaching into the said lumen, the free end of said dip tube being provided with a weight. Thus, when the nozzle is fitted onto the bulb, the free end of said dip tube extends into the bulb and, due to the weight attached thereto, is submerged in the irrigation fluid at any spatial position in which the bulb is held. Upon compression of bulb, the irrigation fluid is urged into the lumen through said dip tube and from the lumen into the irrigation tip through said fluid outlet. The bulb may be essentially ball- or pear-shaped or essentially cylindrical. The bulb may be made from any suitable elastic material, for example, rubber. Silicon rubber and soft polyvinylchloride, which are medically compatible materials, are preferred. The opening of the bulb may be provided with means for sealingly fitting the base portion of the nozzle thereto. These means may be threads, O-rings, bayonets or any other suitable means providing for sealed-fitting. The bulb opening can be large enough to enable filling the bulb with the irrigation fluid by simply pouring the irrigation fluid thereinto, optionally via a funnel, before fitting the nozzle thereon. The bulb can be washed, between uses, in the same manner, after removing the nozzle. This facilitates use considerably. The nozzle may be made from any suitable rigid material, preferably rigid medically compatible plastic material. The base portion of the nozzle, which is to be sealing fitted to the bulb opening, may be provided with means for said sealed-fitting, which correspond to the sealing means provided on said opening, and which may be threads, O-rings, bayonets or any other suitable means providing for sealed-fitting. The nozzle may be manufactured in the form of a single, integral part, or it can be mounted from separate parts. The non-kinking dip-tube can be straight or spiral, and can be made from any suitable medically compatible material. Preferred materials are polyvinylchloride and other soft plastic materials, rubber, silicon rubber and latex. According to the invention, the nozzle is equipped with a one-way valve, located within the lumen of the nozzle, which permits exit of the irrigation fluid through the nozzle and the irrigation means into the oral cavity, but prevents back-flow of any oral fluids, e.g. saliva, back into the bulb. In such embodiments contamination of the bulb and the irrigation fluid contained therein by contaminants such as bacetria or blood is prevented, providing for improved hygiene. A further one-way valve is provided, to permit suction of air into the bulb. This further one-way valve is situated at an outside wall of the bulb, or on the rigid nozzle. The irrigation means, namely tips, probes or needles, are attached to the irrigator via the fluid outlet, which is suitably designed or can optionally be equipped with means for attaching the irrigation means, such means being known in the art. The weight which is attached to the free end of the dip tube is made from a suitable material having high specific gravity, preferably metal. A preferred embodiment of an oral irrigator according to the invention is illustrated in the appended Figures. As may be seen in Figs. 1 and 2, the oral irrigator comprises a bulb (1), which has an opening (2). The second part of the oral irrigator is a nozzle (3). The nozzle has a base portion (4), which may be sealing fitted to the bulb opening (2). In the illustrated embodiment, the sealed fitting is achieved by means of threads. The nozzle (3) is threaded onto the bulb at opening (2) by means of threads (5) and corresponding threads on the base portion (4) of the nozzle. The threads can be replaced by other sealing means known to the man skilled in the art, such as O-rings, bayonets and the like. The bulb opening and the base part of the nozzle can also be sodimensioned as to achieve sealed-fitting by pressure only, pressing the base portion of the nozzle into the bulb opening, without the need for any particular sealing means. The nozzle (3) has a lumen (6), along the longitudinal axis thereof, ending with a fluid outlet (7) at the upper end thereof. This fluid outlet is designed to be fitted with any suitable irrigation tips, probes or needles (8, 8', 8''). Alternatively the fluid outlet (7) may be equipped with means known in the art for attaching the irrigation means thereto. The nozzle (3) is further provided with an elongate, flexible non-kinking dip tube (9). The illustrated dip tube is spiral, but it can also be non-spiral. One end of the dip tube (9) is accomodated within said lumen (6), the free end of said dip tube (10) is provided with a weight (11). As may be seen in Figs. 3A to 3D, the weight (11) ensures that the free end (10) of the dip tube to which it is attached is submerged in the irrigation fluid (12) at any spatial position in which the oral irrigator is held (upside-down - Fig. 3A; upright - Fig. 3B; inclined - Fig. 3C; horizontal - Fig.3D). Upon compression of the bulb (1), the irrigation fluid (12) is urged via the dip tube, through the opening at said free end thereof (10), into the said lumen (6), and from there into the irrigation tip (8), through said fluid outlet (7). As may be seen in Figs. 4A And 4B, the nozzle (3) is further equipped with a one-way valve (13), accomodated within said lumen (6). The one-way valve (13) allows for exit of the irrigation fluid (12) to the irrigation means (8), but prevents back-flow of any oral fluids back into the bulb (1) and irrigation fluid (12). Another one-way valve ((14) in Fig. 4A; (14') in Fig. 4B) permits suction of air into the bulb. While a single embodiment has been described in detail, the invention is not limited thereto and is only defined by the scope of the appended claims.

Claims: An oral irrigator fluid dispensing apparatus comprising an elastic compressible bulb (1) having an opening (2) and an internal cavity for holding an irrigation fluid therein such that the irrigation fluid always settles to a low region of the internal cavity within the bulb in any spatial orientation of the bulb, a rigid nozzle (3) having a base portion (4) to which the bulb opening is attached and a lumen (6) having a fluid outlet (7) at an upper portion thereof, a flexible, non-kinking tube (9), one end of which is being coupled to a lower portion of said lumen, the tube extending into the cavity in the bulb and having a second end (10) being a fluid inlet end within the cavity, irrigation means (8) coupled to said fluid outlet of said lumen for dispensing said irrigation fluid therefrom by compressing said bulb, a weight (11) attached to the fluid inlet end (10) of the tube within cavity with the tube being of a sufficient length and flexibility such that with the cooperation of the said weight, the fluid inlet end of the tube is maintained in said low region of the cavity to enable irrigation fluid therein to flow through the flexible tube to the nozzle regardless of the spatial orientation of said bulb, and a first one-way valve (14) for preventing flow of air from said bulb when the bulb is compressed and permitting flow of air into the bulb during decompression; characterised in that the first one-way valve (14) is positioned in communication with the outside wall of the bulb or in the nozzle for drawing air respectively through the wall of the bulb or the nozzle into the bulb, and in that a second one-way valve (13), which is separate from the first one-way valve (14), is accommodated within said lumen for enabling said irrigation fluid to flow from said bulb through the flexible tube, nozzle and irrigation means so as to be dispensed therefrom upon compression of said bulb and for preventing contaminated oral fluids from flowing into said cavity of said bulb by way of said irrigation means, nozzle, and flexible tube upon decompression of the bulb. An oral irrigator fluid dispensing apparatus according to claim 1, characterised in that said fluid outlet (7) is equipped with suitable means for attaching the irrigation means (8) thereto. An oral irrigator fluid dispensing apparatus according to claim 1 or claim 2, characterised in that said nozzle (3) constitutes a single part. An oral irrigator fluid dispensing apparatus according to claim 1 or claim 2, characterised in that said nozzle (3) comprises several parts which may be permanently or releasably mounted together. An oral irrigator fluid dispensing apparatus according to any preceding claim, characterised in that said nozzle (3) is made from a rigid plastic material. An oral irrigator fluid dispensing apparatus according to any preceding claim, characterised in that said bulb (1) is formed from an elastic material. An oral irrigator fluid dispensing apparatus according to any preceding claim, characterised in that said bulb (1) is compressible. An oral irrigator fluid dispensing apparatus according to any preceding claim, characterised in that said bulb (1) is made from rubber. An oral irrigator fluid dispensing apparatus according to claim 8, characterised in that said bulb (1) is made from silicon rubber. An oral irrigator fluid dispensing apparatus according to any one of claims 1 to 7, characterised in that said bulb (1) is made from soft polyvinylchloride. An oral irrigator fluid dispensing apparatus according to any preceding claim, characterised in that said tube (9) includes a spiral portion which is located in said internal cavity of said bulb. An oral irrigator fluid dispensing apparatus according to any one of claims 1 to 10, characterised in that said tube (9) has an essentially non-spiral shape. An oral irrigator fluid dispensing apparatus according to any preceding claim. characterised in that said tube (9) is formed from a suitable medically compatible material. An oral irrigator fluid dispensing apparatus according to any preceding claim, characterised in that said tube (9) is made of a material selected from the group consisting of polyvinylchloride, soft plastic material, rubber, silicon rubber or latex. An oral irrigator fluid dispensing apparatus according to any preceding claim, characterised in that said weight (11) is made from a material having a high specific gravity. An oral irrigator fluid dispensing apparatus according to claim 15, characterised in that said weight (11) is made from metal. An oral irrigator fluid dispensing apparatus according to any preceding claim, characterised in that said base portion (4) of said nozzle (3) is formed from a rigid material.

Inventors: NOVADENT LTD, BAB, ITAI, PORAT, GADI, NOVADENT LTD.
Applicants: NOVADENT LTD, NOVADENT LTD.
Application year: 1993
Main classification: A61C17
IPC codes: A61C17, B65D83, A61C19