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WO1997046173A1 - Systeme anti-refoulement pour dispositif d'aspiration - Google Patents

Systeme anti-refoulement pour dispositif d'aspiration Download PDF

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Publication number
WO1997046173A1
WO1997046173A1 PCT/US1997/009720 US9709720W WO9746173A1 WO 1997046173 A1 WO1997046173 A1 WO 1997046173A1 US 9709720 W US9709720 W US 9709720W WO 9746173 A1 WO9746173 A1 WO 9746173A1
Authority
WO
WIPO (PCT)
Prior art keywords
backflow
vacuum
valve seat
prevention device
backflow prevention
Prior art date
Application number
PCT/US1997/009720
Other languages
English (en)
Inventor
Kevin Helmer
Richard Bushman
Original Assignee
Kevin Helmer
Richard Bushman
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 Kevin Helmer, Richard Bushman filed Critical Kevin Helmer
Priority to AU32309/97A priority Critical patent/AU3230997A/en
Publication of WO1997046173A1 publication Critical patent/WO1997046173A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/06—Saliva removers; Accessories therefor
    • A61C17/12—Control devices, e.g. for suction
    • A61C17/125—Control devices, e.g. for suction with backflow prevention, e.g. check valves

Definitions

  • the invention relates to suctioning devices, and more particularly to medical suctioning devices that are adapted to prevent backflow of saliva, blood and other contaminants into the mouth of a dental patient, for example. Embodiments of the invention have potential application beyond the dental and medical arts, however. 2. Description of Related Art
  • the vacuum- release aperture is said to prevent creation of a temporary high vacuum in the patient's mouth; the aperture also likely prevents stoppage of air and /or fluid, at least between the aperture and the rest of the vacuum system.
  • the Powers, Jr. patent appears to rely merely on a "tortuous path" within the device to substantially prevent backflow of bacteria.
  • a boundary layer can form around the internal circumference of many currently used suctioning devices. The boundary layer is the portion of air and/or other fluid flowing in the immediate vicinity of the internal circumference.
  • Flow within the boundary layer is severely reduced, even eliminated due to the forces of adhesion and viscosity caused by the internal circumference. Because suction within the boundary layer is reduced or eliminated, a "bio-film" can be created, allowing saliva, blood and other contaminants to flow by gravity, for example, from the main vacuum system of a dental office, through saliva ejector assemblies and into the mouths of patients.
  • a dental apparatus backflow-prevention system substantially prevents contaminant backflow into a patient's mouth.
  • the system includes a saliva ejector tube for insertion into the patient's mouth and for removal of saliva, blood, etc. when a vacuum is applied.
  • a backflow-prevention device receives fluid from the saliva ejector tube and includes an internal valve seat.
  • Valve componentry disposed within the backflow-prevention device includes a housing and a seating mechanism operably supported by the housing to automatically engage the valve seat and prevent contaminant backflow upon release of the vacuum.
  • the seating mechanism automatically disengages from the valve seat and allows fluid flow away from the patient's mouth.
  • the seating mechanism is functionally flexible for movement within the housing away from the valve seat, and is spring- biased to move toward the valve seat upon release of vacuum.
  • Figure 1 is an isometric, exploded view of a backflow-prevention system according to an embodiment of the invention
  • Figure 2 is a cross-sectional view of the Figure 1 system
  • Figure 3 is an isometric, exploded view of a backflow-prevention system according to an alternative embodiment of the invention
  • Figure 4 is a cross-sectional view of the Figure 3 system
  • Figure 5 is an isometric view of alternative valve componentry according to an embodiment of the invention
  • Figure 6 is a cross-sectional view of the Figure 5 componentry
  • Figure 7 is an isometric view of alternative valve componentry according to an embodiment of the invention.
  • Figure 8 is a cross-sectional view of the Figure 7 componentry
  • Figure 9 is an isometric view of alternative valve componentry according to an embodiment of the invention.
  • Figure 10 is a cross-sectional view of the Figure 9 componentry
  • Figure 11 is an isometric view of valve componentry according to the embodiment of Figures 1-2;
  • FIG 12 is an isometric view showing the embodiment of Figures 1-2 in assembled form.
  • Suction is often used in dental applications, as described above.
  • Suctioning devices are also typically used to drain fluid and remove blood from many surgical environments, aid in respiration, and aid in a number of other medical and surgical procedures. Additionally, suctioning devices in which cross-contamination is undesirable also are used in non-medical and non-surgical environments. Therefore, although preferred embodiments of the invention will be described with respect to dental devices and applications, the invention is not limited to these embodiments.
  • a dental suctioning device preferably includes saliva ejector tube 5 for insertion into a patient's mouth, backflow-prevention device 10 with corresponding distal portion 13, internal valve componentry 15, and main body cap or proximal portion 20, and vacuum source /apparatus 25.
  • Saliva ejector tube 5 includes distal end 30, which preferably serves as a mouthpiece for contacting and directly withdrawing saliva, blood and /or other fluids and contaminants from a patient's mouth during a dental procedure, for example.
  • Saliva ejector tube 5 further includes proximal end 35, for connection to backflow-prevention device 10.
  • proximal end 35 of saliva ejector tube 5 is preferably received within substantially straight-walled orifice 40 of neck portion 45 in distal portion 13 of backflow-prevention device 10.
  • Orifice 40 allows fluids to enter main body 50 of backflow-prevention device 10.
  • orifice 40 includes a portion 43 of reduced circumference, to "bite" into and thus better secure ejector tube 5.
  • Backflow-prevention device 10 also includes blocking seat 55 comprising a central orifice, as shown.
  • Blocking seat 55 preferably is directly connected to central cavity 60, which receives fluids from orifice 40 and which preferably is of a substantially tapered shape, as shown, to improve flow characteristics.
  • Blocking seat 55 is disposed distally of substantially annular orifice 58, described below.
  • seat 55 is of substantially thin-walled and/or flexible construction, to better conform to the shape of an engagement member of associated valve componentry, as will be described.
  • Valve componentry 15 according to an embodiment of the invention will now be described with respect to Figures 1-2 and 11.
  • Valve componentry 15 includes outer support ring or housing 65, which according to the illustrated embodiment is substantially circular but can take other shapes as may be desirable to match the internal or external shapes of distal and proximal portions 13, 20 of backflow-prevention device 10.
  • Outer ring 65 supports seating mechanism or blocking member 70, which allows fluid flow of saliva and /or other substances when vacuum is applied via vacuum source 25, and substantially prevents backflow of such substances when vacuum is not applied by seating within seat 55.
  • Seating mechanism 70 includes engagement member 75, preferably of substantially ball-like or bulbous shape, and biassing member or spring assembly 80, best shown in Figure 11.
  • spring assembly 80 comprises a substantially triangular base portion 210, supporting two outer legs 215 and a central leg 220.
  • Legs 215, 220 each include notches 225, the placement of which can be chosen to affect the spring action of seating mechanism 70, i.e. the force necessary to open and /or close the orifice in seat 55.
  • only one notch is disposed in each leg 215, 220 in the illustrated embodiments, it is contemplated that each leg could have a plurality of notches 225.
  • spring assembly 80 is in a minimal-stress condition when engagement member 75 is engaged with - 6 -
  • a minimal-stress condition is preferred over a zero-stress condition, to minimize the tendency of engagement member 75 to bounce or otherwise move in seat 55.
  • the orifice of seat 55 is closed and backflow is substantially prevented.
  • legs 215, 220 bend such that engagement member 75 moves into an open position with respect to seat 55, allowing fluid to flow from the patient's mouth toward vacuum apparatus 25.
  • seating mechanism snaps or otherwise moves to a closed position.
  • Seating mechanism 70 thus is functionally flexible.
  • engagement member 75 can be connected to outer ring 65 by a plurality of circumferentially spaced spring assemblies 80 to allow e.g. substantially linear movement of seating engagement member 75 into and out of engagement with blocking seat 55 of backflow-prevention device 10.
  • Engagement member 75 also can include a substantially cup-shaped or other surface for close interface with housing 65, such that any backflow helps move seating mechanism 70 to its closed position.
  • main body cap 20 preferably includes annular flange 85 for connection to the rest of backflow- prevention device 10, for example by snap-fitting into snap-ring 90 thereof.
  • valve componentry 15 is accommodated within annular orifice 58 of distal portion 13 preferably by a friction fit, with substantially triangular members 93 "biting" into housing 65 of componentry 15 as it is inserted into recess 58.
  • Proximal portion 20 includes similar members for better engaging snap-ring 90, and for additionally compressing valve componentry 15.
  • seat 55 extends a sufficient distance above the distal walls 92 of orifice 58 to create a "damming" effect for reducing backflow past seat 55. Before backflow can reach seat 55, it must build up within well 94 surrounding seat 55 and reach a "height" sufficient to flow through the orifice in seat 55. This creates a time delay, giving seating mechanism 70 time to close before backflow can occur.
  • Main body cap 20 also preferably includes substantially straight- walled cavity 95 and substantially tapered portion 100, which leads to neck portion 105. Neck portion 105 includes orifice 110 for connection to receptacle portion 115 of vacuum apparatus 25.
  • Vacuum apparatus 25 also preferably includes an on/off valve to activate /deactivate vacuum pressure.
  • Figure 12 shows the system of Figures 1-2 in an assembled condition.
  • Figures 3-4 illustrate an alternative embodiment of the invention.
  • saliva ejector tube 5 is substantially similar to that described in the previous embodiment.
  • Backflow-prevention device 10 includes a plurality of internal fins 130, which lead to blocking seat 55. Although six fins 130 are used according to the illustrated embodiment, a greater or lesser number can be used as desired.
  • Valve componentry 15 includes preferably spherical ball 140, urged toward blocking seat 55 by wound spring 145. When vacuum is not applied, ball 140 is substantially sealingly engaged with seat 55, and componentry 15 thus prevents backflow into saliva ejector tube 5. When vacuum is applied, on the other hand, ball 140 compresses spring 145 against seat 150 of main body cap 20, allowing fluid to flow from saliva ejector tube 5 through backflow-prevention device 10 and into vacuum apparatus 25.
  • Main body cap 20 also includes a plurality of fins 155 preferably corresponding to fins 130 of the rest of backflow-prevention device 10. Together fins 130, 155 control movement of valve componentry 15 and allow flow of fluid around componentry 15 through main body portion 20 when vacuum is applied. Fins 130, 155 also substantially prevent relative rotation between backflow- prevention device 10 and main body cap 20. As illustrated, main body cap 20 also preferably includes annular flange 160 for entering orifice 170 of backflow-prevention device 10 and snap-fitting into corresponding annular recess 175 therein. Other elements of the embodiment illustrated in Figures 3-4 are similar to those described with respect to Figures 1-2 and will not be described again, to simplify the disclosure.
  • Valve componentry 15 can take various alternative forms, as shown in Figures 5-8.
  • Conical device 185 for example, can be used in connection with resilient material 190 to maintain pressure on blocking seat 55 in the absence of vacuum and thus prevent backflow.
  • flap device 195 with at least one seating flange 198 can be used, as can blocking portion 200 with spring-actuating portions 205.
  • valve componentry 15 is of very light weight to ensure a wide enough opening at blocking seat 55 when vacuum is applied. Valve componentry 15 allows the orifice within blocking seat 55 to be relatively large, greatly reducing the likelihood of clogging. Further, saliva ejector tube 5 and backflow-prevention device 10 are preferably disposable according to an embodiment of the invention.
  • An air-flow indicator e.g. a molded arrow
  • the indicator can be disposed on the outside of neck portion 45 of backflow-prevention device 10, for example, or at any other desired portion of the system.
  • a moisture-detection indicator can be included in backflow-prevention device 10 to indicate when moisture passes through it.
  • backflow-prevention device 10 can be formed of or can include a color-change material so that internal moisture is indicated by an external color change.
  • the various elements of the invention can be formed of multiple molded plastic parts.
  • plastic other moldable or even non-moldable materials demonstrating sufficient rigidity, for example polypropylene, polyethylene, various thermal elastomers, and other engineering polymers /plastics, can be used.
  • Spring steel can be used, for example to construct base 210 and /or legs 215, 220 of spring assembly 80.
  • the material can be impregnated with a germicide or other anti-bacterial substance, to further reduce the dangers associated with cross-contamination.
  • the various components can be of either permanent or disposable construction.
  • embodiments of the invention are not limited to situations involving boundary-layer backflow, discussed above.
  • Embodiments of the invention substantially eliminate backflow and the resulting cross-contamination in the vacuum line in a wide variety circumstances and applications.
  • Various other modifications and changes may occur to those skilled in the art without departing from the spirit and scope of the invention.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Check Valves (AREA)

Abstract

L'invention concerne un système anti-refoulement (10) pour dispositif de soins dentaires, qui élimine sensiblement les risques de contamination par refoulement dans la bouche d'un patient. Le système comprend une pompe à salive (5) qui, introduite dans la bouche du patient, aspire la salive, le sang, etc. quand l'aspiration se déclenche. Le dispositif anti-refoulement (10) reçoit le fluide aspiré par la pompe à salive (5). Il comprend un siège de valve interne (55). L'organe fonctionnel de valve placé dans le système comporte un boîtier (65) et un mécanisme d'assise (70) qui s'appuie sur le boîtier (65) pour enclencher automatiquement le siège de valve (55), et éviter ainsi les risques de contamination par refoulement en fin d'aspiration. Néanmoins, dès l'aspiration, le mécanisme d'assise (70) libère automatiquement le siège de valve (55) et permet l'écoulement de fluide hors de la bouche du patient. Dans une variante, le mécanisme d'assise (70) a une souplesse fonctionnelle de mouvement dans le boîtier qui lui permet de s'éloigner du siège de valve (55), et une contrainte fonctionnelle s'exerce sur lui pour le rapprocher du siège de valve (55) en fin d'aspiration. On décrit aussi un procédé associé qui offre les avantages exposés ci-dessus.
PCT/US1997/009720 1996-06-03 1997-06-03 Systeme anti-refoulement pour dispositif d'aspiration WO1997046173A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32309/97A AU3230997A (en) 1996-06-03 1997-06-03 Backflow prevention system in suctioning apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1909096P 1996-06-03 1996-06-03
US60/019,090 1996-06-03

Publications (1)

Publication Number Publication Date
WO1997046173A1 true WO1997046173A1 (fr) 1997-12-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/009720 WO1997046173A1 (fr) 1996-06-03 1997-06-03 Systeme anti-refoulement pour dispositif d'aspiration

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Country Link
AU (1) AU3230997A (fr)
WO (1) WO1997046173A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0931519A1 (fr) * 1995-07-18 1999-07-28 Atrion Medical Products, Inc. Collecteur autogène de dragments osseux
EP2303181A2 (fr) * 2008-06-27 2011-04-06 RJC Products LLC Modèle amélioré d'obturateur de clapet anti-retour pour injecteur de fluide
CN101896135B (zh) * 2007-05-22 2013-09-11 Rjc产品有限公司 用于流体注射器的改进的止回阀

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570525A (en) * 1969-04-21 1971-03-16 Adolph W Borsum Stem-actuated tiltable valve
US4081176A (en) * 1975-07-01 1978-03-28 Johnson W Grant Valve for an oral evacuator system
US4232677A (en) * 1977-06-07 1980-11-11 Saul Leibinsohn Microbe-barrier drainage device
US5267586A (en) * 1991-11-08 1993-12-07 Planmeca Oy Shutoff valve mechanism for the oral evacuator of a dental unit
US5464397A (en) * 1994-01-11 1995-11-07 Powers Jr.; Carleton A. Bacteria valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570525A (en) * 1969-04-21 1971-03-16 Adolph W Borsum Stem-actuated tiltable valve
US4081176A (en) * 1975-07-01 1978-03-28 Johnson W Grant Valve for an oral evacuator system
US4232677A (en) * 1977-06-07 1980-11-11 Saul Leibinsohn Microbe-barrier drainage device
US5267586A (en) * 1991-11-08 1993-12-07 Planmeca Oy Shutoff valve mechanism for the oral evacuator of a dental unit
US5464397A (en) * 1994-01-11 1995-11-07 Powers Jr.; Carleton A. Bacteria valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0931519A1 (fr) * 1995-07-18 1999-07-28 Atrion Medical Products, Inc. Collecteur autogène de dragments osseux
CN101896135B (zh) * 2007-05-22 2013-09-11 Rjc产品有限公司 用于流体注射器的改进的止回阀
EP2303181A2 (fr) * 2008-06-27 2011-04-06 RJC Products LLC Modèle amélioré d'obturateur de clapet anti-retour pour injecteur de fluide
EP2303181A4 (fr) * 2008-06-27 2014-05-07 Rjc Products Llc Modèle amélioré d'obturateur de clapet anti-retour pour injecteur de fluide

Also Published As

Publication number Publication date
AU3230997A (en) 1998-01-05

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