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WO1996004935A1 - Systeme d'alimentation en eau sterile destine a une installation dentaire - Google Patents

Systeme d'alimentation en eau sterile destine a une installation dentaire Download PDF

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Publication number
WO1996004935A1
WO1996004935A1 PCT/US1994/010861 US9410861W WO9604935A1 WO 1996004935 A1 WO1996004935 A1 WO 1996004935A1 US 9410861 W US9410861 W US 9410861W WO 9604935 A1 WO9604935 A1 WO 9604935A1
Authority
WO
WIPO (PCT)
Prior art keywords
waterline
ultraviolet light
water
hydrogen peroxide
transmitting medium
Prior art date
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.)
Ceased
Application number
PCT/US1994/010861
Other languages
English (en)
Inventor
David A. Hamlin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BTG International Inc
Original Assignee
British Technology Group USA Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Technology Group USA Inc filed Critical British Technology Group USA Inc
Publication of WO1996004935A1 publication Critical patent/WO1996004935A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/0007—Control devices or systems
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides

Definitions

  • the present invention relates to a sterile water supply system for use in dental equipment and, more particularly, to a water supply system using ultraviolet light and hydrogen peroxide to prevent growth in water supply lines of microbiota, such as bacteria, viruses, etc.
  • Fig. 1 Many dental delivery systems, commonly used by dentists for a variety of procedures, are of similar basic design. Referring to Fig. 1, these delivery systems consist of a base unit 58 and one or more hand-held units 60.
  • the base unit provides power 62, water 64 and control functions 66 to the hand-held units 60.
  • a variety of tips 68 can be placed on the hand-held units, depending upon the treatment the dentist is using. It is obviously important to ensure elimination of cross contamination by rendering the instruments attached to these lines sterile, particularly the hand-held units which are placed in the patient's mouth.
  • Most dental tools are disconnectible and sterilizable, but the water lines are not. Fouling of water lines can cause microbial organisms to be distributed to sterilized dental tools before the dental tools are even used.
  • the narrow tubing in dental delivery systems provides an ideal home for bacteria to thrive in biofilms. Because of the physical characteristics of water flow, the water in contact with the tubing surface is stationary. As a result, flushing dental systems with water does nothing to reduce or disturb the biofilm.
  • a possible solution to this problem is to use a sterile water supply.
  • the sterile water will become contaminated once it passes through the waterlines.
  • the use of ultraviolet light is increasing as a general method of water sterilization.
  • Ultraviolet radiation in the 200- 300nm wavelength region can inactivate bacteria, protozoa, viruses, fungi, yeasts and algae although the resistance to ultraviolet radiation varies between organisms. At sufficiently high radiation doses all contaminants can be completely destroyed. It is easy to use and avoids the residues and potential by-products that arise from conventional chemical treatments.
  • ultraviolet light treatment requires adequate residence time of the water in the ultraviolet zone as well as good transmission through the water layer.
  • UV light treatment may sterilize the water, in a dental water delivery system it is the surface of the pipes and tubing carrying the water that become contaminated, especially when the water is not flowing.
  • the ultraviolet light treatment does not provide a satisfactory method of sterilizing the surface of the water pipes and tubes.
  • chemical treatments do have advantages over ultraviolet radiation treatments.
  • the chemicals persist in the water after the direct exposure time, which is inevitably short. Chemical treatments are also unaffected by water opacity. Hydrogen peroxide is an acceptable treatment but, used on its own, requires a high concentration to guarantee effectiveness and the residual peroxide level normally makes it an unacceptable treatment for drinking water.
  • the present invention is directed to a water supply system which comprises a waterline, means for selectively providing hydrogen peroxide to the waterline, and an ultraviolet light emitting medium extending along at least a portion of the length of the waterline such that ultraviolet light can pass from the medium into the waterline.
  • the present invention is also directed to a method of sterilizing a dental water supply system in which water is fed through a waterline to a dental device. The method comprises selectively providing hydrogen peroxide into the water in the waterline, and subjecting the water and hydrogen peroxide solution to ultraviolet light.
  • FIG. 1 is a schematic drawing of a typical dental delivery system.
  • Fig. 2 is schematic drawing of a dental delivery system containing a form of the water supply system of the present invention.
  • Fig. 3 is a side plan view of a typical hand-held dental unit.
  • Fig. 4 is a cross-sectional view taken along line 4-4 of Fig. 3.
  • Fig. 5 is a perspective view of another form of the present invention.
  • Fig. 6 is a perspective view of a third form of the present invention.
  • the water supply system 10 includes a base unit 12, a water source 14 and a hydrogen peroxide source 16, both connected to a waterline 18 through lines 19 and 20 respectively.
  • a valve 21 is provided in line 20 for controlling the flow of hydrogen peroxide into the system.
  • Attached along the length of the waterline 18 is a light emitting medium 22, such as an optical fiber.
  • the optical fiber 22 may be made of quartz.
  • the optical fiber 22 is attached to an ultraviolet light source 24, contained within the base unit 12.
  • the waterline 18 and the light emitting medium 22 continue through the base unit 12 and are connected at the other end away from the base unit to one or more hand held units 26.
  • FIG. 3 there is shown a schematic view of the hand-held dental unit 26 which is used with the water supply system 10 of the present invention.
  • the waterline 18 is attached along its length to the ultraviolet light emitting medium 22, such as an optical fiber.
  • the waterline 18 and the light emitting medium 22 continue through the handle 28 of the hand ⁇ held unit to the tip 30.
  • the waterline 18 is attached along a surface 32 to the light emitting medium 22, such as an optical fiber.
  • the light emitting medium 22 such as an optical fiber.
  • This window area 34 is of a material transparent to ultraviolet light, such as quartz, to allow ultraviolet light from the light emitting medium 22 to penetrate through the waterline 18 and into any liquid contained in the waterline 18.
  • the waterline 18 may be made from any flexible material. It is preferable that the material be plastic.
  • the waterline 18 may be opaque or translucent to ultraviolet light, except for the window area 34, which is transparent to ultraviolet light.
  • the water supply system 36 comprises a waterline 38 which is embedded within a light emitting medium 40.
  • the waterline 38 is made of a flexible material which allows light from the light transmitting medium 40 to pass through the waterline 38 and into the liquid within the waterline 38.
  • the light emitting medium 40 may be designed such that ultraviolet light will radiate only towards the embedded waterline 38, with no light radiating external from the light embodying medium 40. At least a portion of the waterline 38 is transparent to ultraviolet light.
  • FIG. 6 there is shown another form of a water supply system 42 of the present invention.
  • a light emitting medium 44 such as an optical fiber, is embedded within a waterline 46.
  • Ultraviolet light from the light emitting medium 44 radiates in all directions into the fluid running through the waterline 46.
  • the outer surface 48 of the waterline 46 may be completely opaque to ultraviolet light.
  • hydrogen peroxide is mixed with the water in the waterline.
  • concentration of the hydrogen peroxide can be controlled through the use of the valve system 21 in Fig. 2.
  • concentration of hydrogen peroxide should be no greater than 10% by weight, and preferably no greater than 3% by weight.
  • the ultraviolet light source 24, as shown in Fig 2. is turned on.
  • the wavelength of the ultraviolet light should be wholly or predominantly below 325nm. Ultraviolet light radiates from the light emitting medium attached to the light source into the waterline containing the water-hydrogen peroxide mixture, resulting in the sterilization of the waterline.
  • the low concentration of hydrogen peroxide is required to provide a low concentration of radicals which result in sterilization when subjected to the ultraviolet light. At higher concentrations of hydrogen peroxide, there is provided a higher concentration of radicals which tend to recombine with each other rather than result in sterilization. The hydrogen peroxide is then shut off, and the waterline may be flushed with pure water.
  • a water supply system for use in dental delivery units which contains both an ultraviolet light and a source of hydrogen peroxide.
  • the hydrogen peroxide and ultraviolet light may be introduced at one end of the water supply system, its threshold value is sufficient to result in sterilization along the entire length of the supply system.
  • This provides the ability to kill organisms in the system and thereby sterilize the waterlines of the dental delivery unit quickly and efficiently.
  • the combination of ultraviolet light hydrogen peroxide provides more thorough decontamination of the waterlines than using either method alone.
  • the system may be sterilized at the convenience of the operator. The operator, whether dentist or technician, can be sure of using a sterile water supply for each patient. Also, this water system sterilization can be used for water supply systems in other industries, such as in the food processing and pharmaceutical processing industries.

Landscapes

  • Health & Medical Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Organic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Dentistry (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Epidemiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Physical Water Treatments (AREA)

Abstract

Système (10) d'alimentation en eau, destiné notamment à une installation dentaire, comprenant une conduite (18) d'eau ainsi qu'un milieu (22) de transmission de lumière ultraviolette s'étendant le long de la conduite (18) d'eau. Ledit milieu (22) peut être fixé le long de la surface extérieure de la conduite (18) d'eau, une fenêtre étant ménagée entre la conduite (18) et le milieu (22), afin de permettre aux rayons ultraviolets de passer du milieu (22) dans la conduite (18). Ledit milieu (22) peut être également encastré dans la conduite (18) d'eau de manière que la lumière ultraviolette rayonne dans toutes les directions, du milieu (22) dans la conduite (18). La conduite (18) d'eau peut être encastrée dans le milieu (22) de transmission de lumière de telle manière que la lumière ultraviolette rayonne à travers la surface de la conduite (18) d'eau. On mélange à l'eau (14) de la conduite (18) du peroxyde d'hydrogène (16) qui est soumis aux rayons ultraviolets, ce phénomène concourant à la stérilisation de l'eau contenue dans la conduite.
PCT/US1994/010861 1994-08-15 1994-09-26 Systeme d'alimentation en eau sterile destine a une installation dentaire Ceased WO1996004935A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29052594A 1994-08-15 1994-08-15
US08/290,525 1994-08-15

Publications (1)

Publication Number Publication Date
WO1996004935A1 true WO1996004935A1 (fr) 1996-02-22

Family

ID=23116398

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/010861 Ceased WO1996004935A1 (fr) 1994-08-15 1994-09-26 Systeme d'alimentation en eau sterile destine a une installation dentaire

Country Status (1)

Country Link
WO (1) WO1996004935A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999027970A3 (fr) * 1997-12-01 1999-07-22 Zamir Tribelski Procede de desinfection de liquides et de gaz et dispositifs utilisables a cette fin
US7033511B2 (en) 2004-01-20 2006-04-25 A-Dec, Inc. Sustained water treatment in dental equipment
EP1698352A1 (fr) * 2002-08-05 2006-09-06 CASTELLINI S.p.A. Utilisation d'une composition active pour la désinfection et/ou stérilisation d'une unité dentaire
EP2253290A3 (fr) * 2009-05-18 2013-10-16 Dental Equipment LLC d/b/a Pelton & Crane Company Outil dentaire manuel doté d'un réacteur de désinfection
AU2012227351B2 (en) * 2009-05-18 2015-05-14 Dental Equipment, Llc Dental hand tool with disinfectant reactor
CN107265554A (zh) * 2016-04-20 2017-10-20 贺苏国际贸易（上海）有限公司 一种水路灭菌器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012321A (en) * 1975-03-25 1977-03-15 The United States Of America As Represented By The Secretary Of The Navy Oxidation of refractory organics in aqueous waste streams by hydrogen peroxide and ultraviolet light
US4289728A (en) * 1979-01-11 1981-09-15 National Research Development Corp. Improvements in methods of sterilization
US5244570A (en) * 1991-05-06 1993-09-14 Champion International Corporation Apparatus for treating wastewater
US5262066A (en) * 1991-11-13 1993-11-16 Soye Charles C Van Process for delivering radiant energy for the treatment of fluids
US5320749A (en) * 1992-03-26 1994-06-14 Mullen Patrick J Apparatus for treatment of fluid media with ultraviolet irradiation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012321A (en) * 1975-03-25 1977-03-15 The United States Of America As Represented By The Secretary Of The Navy Oxidation of refractory organics in aqueous waste streams by hydrogen peroxide and ultraviolet light
US4289728A (en) * 1979-01-11 1981-09-15 National Research Development Corp. Improvements in methods of sterilization
US5244570A (en) * 1991-05-06 1993-09-14 Champion International Corporation Apparatus for treating wastewater
US5262066A (en) * 1991-11-13 1993-11-16 Soye Charles C Van Process for delivering radiant energy for the treatment of fluids
US5320749A (en) * 1992-03-26 1994-06-14 Mullen Patrick J Apparatus for treatment of fluid media with ultraviolet irradiation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999027970A3 (fr) * 1997-12-01 1999-07-22 Zamir Tribelski Procede de desinfection de liquides et de gaz et dispositifs utilisables a cette fin
US6468433B1 (en) 1997-12-01 2002-10-22 Zamir Tribelski Method for disinfecting liquids and gases and devices for use thereof
EP1698352A1 (fr) * 2002-08-05 2006-09-06 CASTELLINI S.p.A. Utilisation d'une composition active pour la désinfection et/ou stérilisation d'une unité dentaire
US7033511B2 (en) 2004-01-20 2006-04-25 A-Dec, Inc. Sustained water treatment in dental equipment
EP2253290A3 (fr) * 2009-05-18 2013-10-16 Dental Equipment LLC d/b/a Pelton & Crane Company Outil dentaire manuel doté d'un réacteur de désinfection
AU2012227351B2 (en) * 2009-05-18 2015-05-14 Dental Equipment, Llc Dental hand tool with disinfectant reactor
CN107265554A (zh) * 2016-04-20 2017-10-20 贺苏国际贸易（上海）有限公司 一种水路灭菌器

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