WO2001054611A2 - Soupape de regulation d'eau pour porte-outil dentaire - Google Patents

Soupape de regulation d'eau pour porte-outil dentaire Download PDF

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Publication number
WO2001054611A2
WO2001054611A2 PCT/CA2000/000071 CA0000071W WO0154611A2 WO 2001054611 A2 WO2001054611 A2 WO 2001054611A2 CA 0000071 W CA0000071 W CA 0000071W WO 0154611 A2 WO0154611 A2 WO 0154611A2
Authority
WO
WIPO (PCT)
Prior art keywords
water
conduit
channel
piston
discharge
Prior art date
Application number
PCT/CA2000/000071
Other languages
English (en)
Other versions
WO2001054611A3 (fr
Inventor
Claude Lachapelle
Original Assignee
Claude Lachapelle
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 Claude Lachapelle filed Critical Claude Lachapelle
Priority to PCT/CA2000/000071 priority Critical patent/WO2001054611A2/fr
Priority to AU22730/00A priority patent/AU2273000A/en
Publication of WO2001054611A2 publication Critical patent/WO2001054611A2/fr
Publication of WO2001054611A3 publication Critical patent/WO2001054611A3/fr

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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
    • A61C1/0061—Air and water supply systems; Valves specially adapted therefor
    • 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
    • A61C1/0061—Air and water supply systems; Valves specially adapted therefor
    • A61C1/0076—Sterilising operating fluids or fluid supply elements such as supply lines, filters

Definitions

  • the present invention relates to dental handpieces, and more particularly to a constant water flow device or valve for a handpiece of a dental unit waterline.
  • Dental handpieces e.g. equipped with a bur
  • the pneumatic bur located at the distal free end portion of the handpiece, rotates at high speed under the propelling force of a primary air flow provided by an air turbine, for allowing efficient drilling operations to be performed in the patient's teeth.
  • Cooling of the bur is necessary to prevent the bur and the tooth from becoming too hot under the high velocity friction forces induced therein.
  • the cooling is achieved by means of an atomized water spray which is projected against the tooth and the bur drilling head.
  • the propelling air flow is recovered and discharged. However, the cooling water droplets are expelled into the patient's mouth through the bur head.
  • the amount of water used by the dental handpiece during dental procedures is very small. Due to this low water flow rate and to the relatively important length of the water lines connected to the dentist's water providing apparatus, water therein is likely to stagnate for a few days, typically for one or two weeks on average, before it is expelled at the outlet for cooling the distal bur head.
  • the medium of the water lines containing stagnating water is thus favourable to bacteria development, and the bacteria count may increase significantly during stagnation time at favourable dental room temperatures. This may result in local infections of a patient's oral cavity upon a portion of the high count bacteria water being expelled into his mouth, especially if the patient has flesh wounds resulting either from the dentist's intervention or other causes.
  • Chemical compounds can be injected at regular time intervals into the dentist water line network to sterilize the water tubing and eliminate the bacteria formations in the water lines, when water lines are not in operation.
  • these cleaning products are likely to - and often do - damage the valves and other parts of the water tubes, especially the rubber gaskets and valves therein, due to their chemical composition.
  • a patient may be contaminated by the often toxic cleaning products if residues of this chemical cleaner remain when the water tubes are not rinsed properly after the cleaning products have been circulated therein. Thus, particular efforts have to, be undertaken to both cleanse and rinse the water tubes.
  • Freedman apparatus includes a water tube which is equipped at its intermediate portion with a drainage pipe provided with a flap valve.
  • the tube intermediate portion is destined to be positioned lower than the tube proximal inlet and distal outlet extremities, so that gravity forces the water in the pipe down towards the drainage pipe to evacuate same.
  • the flap valve includes a resilient flap which remains opened in an unbiased condition, thus allowing the water to freely flow out into the drainage pipe; and which closes under the pressure differential to block the drainage pipe upon water flowing from the inlet extremity to the outlet extremity.
  • water back-flow from the distal ejector nozzle into the water tube is allegedly controlled.
  • a problem with the dental apparatus disclosed in the Freedman apparatus is that it requires the water tube to be positioned in a particular way, i.e. with its intermediate portion located lower than the remaining segments of the tube. If other segments are lowered under the level of the drainage pipe, then water stagnation is likely to occur.
  • the dental apparatus of the Freedman apparatus is especially adapted for a water spray nozzle of old construction, where the water flow rate is greater than in modern dental handpieces; thus, the purpose of the drainage pipe in the Freedman patent is to prevent water from running back from the outlet nozzle into the tube, and eventually into the water reservoir. It is not adapted to prevent water stagnation, and does not offer any form of continuous water flow in the tube.
  • the present invention relates to a valve member for operatively linking a dentist cabinet dental handpiece of the type which selectively requires a water flow and which includes a water inlet nozzle and a discharge outlet nozzle, to a main tubing of the type having a water tube outlet and a discharge tube inlet, the water tube outlet providing a continuous positive water flow
  • said valve member comprising: a water conduit for operatively fluidingly linking the water tube outlet to the dental handpiece water inlet nozzle, a continuous positive water pressure thus being present in said water conduit for allowing selective water flow out through the dental handpiece; a discharge conduit for operatively fluidingly linking the discharge tube inlet to the dental handpiece discharge outlet nozzle, the pressure in said discharge conduit being inferior to the pressure in said water conduit; - a bypass channel linking said water conduit to said discharge conduit; and an actuator, selectively movable in said bypass channel between a first limit position in which said actuator allows fluid access through said bypass channel from said water conduit to said discharge conduit, and a second limit position in which said actuator blocks
  • the dental handpiece further is of the type having a high- pressure air inlet nozzle and the tubing further is of the type having a high-pressure air tube outlet selectively providing a high-pressure air flow
  • said valve member further comprising: - a biasing member, for continuously biasing said actuator towards said first limit position; a high-pressure air conduit for operatively fluidingly linking the high-pressure air tube outlet to the dental handpiece water inlet nozzle; and an air channel linking said air conduit to said bypass channel, for forcibly biasing said actuator towards said second position, against the action of said biasing member, upon the high-pressure air flow being fed into said high-pressure air conduit; said actuator, in all positions thereof, sealingly blocking said bypass channel to prevent fluid from flowing between said air conduit and both said water conduit and said discharge conduit.
  • said actuator is a piston slidable in said bypass channel.
  • said biasing member is a coil spring located in said bypass channel.
  • the invention further relates to the valve member as described hereinabove, in combination with the dental handpiece, said dental handpiece having a head portion requiring in an operative condition thereof a high-pressure air flow fed by a handpiece high-pressure air conduit connected to said air inlet nozzle, and a cooling water flow fed by a handpiece cooling water conduit connected to said water inlet nozzle, said dental handpiece expelling at least a portion of said air and water flows through a handpiece discharge conduit connected to the handpiece discharge outlet nozzle.
  • the invention also relates to a water circulation device for preventing water stagnation in the tubing of a dentist cabinet dental waterline unit, said water circulation device for linking a dental handpiece to the tubing, the tubing of the type having a high-pressure air tube for selectively providing a high-pressure air flow to the dental handpiece, a cooling water tube for providing a continuous water cooling water flow for the dental handpiece, a cooling air tube for providing a cooling air flow for atomizing the cooling water into a cooling water spray, and a discharge tube, in which part of the cooling water spray and part of the high-pressure air flow are carried away from the dental handpiece, said water circulation device including a valve member comprising: - a high-pressure air conduit, a cooling air conduit, a cooling water conduit and a discharge conduit, each for operatively fluidingly linking respectively the high-pressure air tube, the cooling water tube, the cooling air tube and the discharge tube to the dental handpiece; a bypass channel fluidingly linking said cooling water conduit to said discharge conduit; a piston movable
  • said actuator is a piston slidable in said bypass channel.
  • said bypass channel comprises a piston channel segment, in which said piston is slidable between said first and second limit positions, a water channel segment linking said water conduit to said piston channel segment, and a discharge channel segment linking said discharge conduit to said piston channel segment, with said water channel segment being located intermediate said discharge channel segment and said air channel, with said piston being located in said first limit position intermediate said air channel and said water and discharge channel segment, and with said piston blocking said water channel segment in said second limit position.
  • the water circulation device comprises a sealing ring located around said valve member and holding each said at least one channel segment opening.
  • said biasing member is a coil spring located in said piston channel segment.
  • the water circulation device further comprises a hollow connector sleeve carrying said sleeve member, said connector sleeve having a first end portion for complementary engagement to said dental handpiece, and a second end portion for complementary engagement to said tubing.
  • the invention also relates to a process of making a water circulation device as defined hereinabove, comprising the steps of: a) moulding a valve member blank; b) longitudinally piercing in said valve member blank said high-pressure air conduit, said cooling water conduit, said cooling air conduit and said discharge conduit; c) transversely piercing in said valve member blank said air piston channel segment, said air channel, said water channel segment and said discharge channel segment, thus creating at least one transverse opening in said blank; d) installing sealing plugs in each one of said at least one openings; and e) forcing in a friction-fit engagement said sealing ring about said valve member for holding said plugs.
  • Figure 1 is a side elevation of a dental handpiece equipped with a bur at its distal end, together with a portion of the water and air tubes which are connected to the handpiece by means of a water circulation device according to the invention
  • Figure 2 is an exploded side elevation, at an enlarged scale, of the proximal end of the dental handpiece, together with the water circulation device according to a preferred embodiment of the invention and with the distal end portion of the water and air tubes, the outer connector sleeve of the water circulation device being shown in cross-section for allowing the inner valve member to be shown, and two of the four inner conduits of the valve member being partly shown in dotted lines
  • Figure 3 is an enlarged cross-sectional view taken along line III-III of figure 5, with the piston of the valve member being shown in a first limit position;
  • Figure 4 is a view similar to figure 3, but with the piston being in a second limit position;
  • Figure 5 is an elevational view of the water valve member according to the invention, with a portion of the sealing ring being broken for showing the sealing plugs of the valve member main body;
  • Figure 6 is a schematic perspective view of the inline fluid circuit of an alternate embodiment of the water valve member of the invention, suggesting in phantom lines the outer limits of the valve member main body;
  • Figures 7 and 8 are views similar to figure 6, but being partially broken to show the interior of the valve member piston channel, with the piston being shown in its second and first limit positions respectively in figures 7 and 8;
  • Figure 9 is a perspective view of the piston of the valve member of the embodiment of figures 6 to 8.
  • Figures 10, 11, 12 and 13 are schematic perspective views of respective third, fourth, fifth and sixth embodiments of water valve members of the invention.
  • FIG. 1 shows a conventional rigid dental handpiece 20, equipped with a conventional bur head 22.
  • An elongated flexible main tube 24 is connected at one end to handpiece 20 through the instrumentality of a water circulation device 26 according to the invention, as will be detailed hereinafter.
  • Main tube 24 is connected to a tap water source atits other end opposite handpiece 20, and as shown in figure 2, comprises four tubes tangentially attached to one another, namely: a high pressure air tube 28, e.g.
  • a cooling water tube 30 for feeding cooling water from the main water tap system to the bur head, for cooling the bur rotating at high velocity and for cooling the tooth being drilled by the bur; a cooling air tube 32, for providing an air flow for atomizing the cooling water from tube 30 at the bur head 22 into a cooling water spray; and a discharge tube 34 for discharging the high-pressure air flow after it has run through the bur head to rotate the bur, and for discharging part of the atomized cooling water spray.
  • tubes can be linked to the flexible elongated main tube 24, such as power cable-carrying tubes for lighting purposes or the like.
  • Figure 2 further shows that the conventional dental handpiece 20 is provided, opposite its distal bur head 22, with a proximal end portion 36 having a thread 38 from which protrudes four nozzles, namely a high-pressure air inlet nozzle 40, a cooling water inlet nozzle 42, a cooling air inlet nozzle 44 and a discharge outlet nozzle 46, each for being connected to the respective tubes 28, 30, 32 and 34 of main tube 24, through the instrumentality of a water circulation device 26 according to the invention, as will be detailed hereinafter.
  • the handpiece nozzles 40, 42, 44, 46 are co-extensive with and connected to inner handpiece conduits (not shown) which carry the respective fluids to or from the bur head portion 22, as known in the art.
  • FIGS. 2 to 5 show that the water circulation device 26 according to the invention comprises a water valve member 48 (shown separately in figure 5) having an outer sealing ring 50 enclosing a cylindrical inner main body 52 made of a suitable corrosion-resistant material, e.g. brass or stainless steel, or even a suitable plastic material.
  • the valve member main body 52 has a first distal end 52a, which defines a peripheral radially-projecting flange 54, and a second proximal end 52b opposite its first end 52a.
  • valve member 48 is inserted inside a connector sleeve 56 which defines a first opened distal end portion 56a having an inner thread 58, and a second opposite opened proximal end portion 56b opposite its first end portion 56a.
  • a peripheral shoulder 60 is located longitudinally inwardly of thread 58, and is sized to receive in stable abutment the peripheral flange 54 of valve member 48 when the latter is coaxially inserted into sleeve connector 56 as shown in figure 2.
  • Valve member nozzles are provided at the proximal end 52b of the valve member main body 52, namely a high-pressure bur air nozzle 62, a cooling water nozzle 64, a cooling air nozzle 66 and a discharge nozzle 68, all for respective friction-fit connection into the slightly resilient tubes 28, 30, 32 and 34 of main tube 24.
  • FIGS. 3 to 5 further show that the valve member main body 52 is full, and longitudinally pierced with a high-pressure bur air conduit 70, a cooling water conduit 72, a cooling air conduit 74 and a discharge conduit 76, which are all coextensive with and connected to the respective valve member nozzles 62, 64, 66 and 68, and which are all opened at the valve member main body distal end 52a for allowing the respective dental handpiece nozzles 40, 42, 44 and 46 to engage conduits 70, 72, 74 and 76 respectively.
  • valve member 48 when the valve member 48 is operatively inserted inside sleeve connector 56 as shown in figure 2 and as described hereinabove, the thread 38 of handpiece 20 can engage the complementary thread 58 of sleeve member 56, with the handpiece nozzles 40, 42, 44 and 46 each being fluidingly connected to a respective valve member conduit 70, 72, 74 and 76.
  • nozzles 40, 42, 44 and 46 extend well short of the valve member proximal end 52b, and more particularly extend down to an intermediate tapered portion 70a, 76a of conduits 70, 72, 74, 76 shown in dotted lines in figure 5 (with the conduits 72, 74 not being shown in figure 5).
  • An annular seal 78 e.g. made of rubber, is preferably inserted between the handpiece proximal end portion 36 and the valve member distal end 52a.
  • transverse channels 80, 82, 84, 86 are made in the valve member main body 52, at an intermediate portion thereof, and are more particularly located spacedly between the valve member main body proximal end 52b and the free extremities of the handpiece nozzles 40, 42, 44, 46 when the latter are operatively inserted into valve member 48.
  • the four transverse channels are a cylindrical piston channel 80 extending spacedly adjacent to the bur air conduit 70 and discharge conduit 76; a first inner air channel 82 fluidingly interconnecting the bur air conduit 70 to piston channel 80; a second inner water channel 84 fluidingly interconnecting the cooling water conduit 72 to the piston channel 80; and a third inner discharge channel 86 fluidingly interconnecting the discharge conduit 76 to the piston channel 80.
  • second inner channel 84 is located between the first and the third inner channels 82, and 86, and is substantially parallel thereto.
  • transverse channels 80, 82, 84, 86 are made by piercing the valve member main body 52 inwardly from its peripheral surface, with the four channels not extending all the way through main body 52.
  • a first channel opening 88 is created by piercing the piston channel 80 and the first inner channel 82
  • a second opening 90 is created by piercing the second inner channel 84
  • a third channel opening 92 is created by piercing the third inner channel 86.
  • channel openings 88, 90, 92 serve no purpose per se, since they owe their existence merely to the through-piercing of the transverse channels 80, 82, 84, 86.
  • Suitable first, second and third sealing plugs 94, 96, 98 e.g. made of rubber, respectively seal the first, second and third channel openings 88, 90, 92.
  • the sleeve member sealing ring 50 is inserted coaxially about the valve member main body 52 until it axially abuts against the valve member main body flange 54, sealing ring 50 frictionally engaging the sealing plugs 88, 90, 92 which prevent sealing ring 50 from accidentally sliding off from main body 52, while sealing ring 50 prevents sealing plugs 88, 90, 92 from being accidentally expelled from their respective channel openings 88,
  • a cylindrical piston 100 e.g. made of nylon, is slidable inside cylindrical piston channel 80, with piston 100 being sized to sealingly fit inside piston chamber 80.
  • Piston 100 is provided with a pair of coaxial integral studs 102, 104 at both of its extremities, the diameter of studs 102, 104 being inferior to the diameter of piston 100.
  • a coil spring 106 coaxially located in piston chamber 80 is installed between the piston channel end wall 80a and the piston 100, preferably being wound partially around stud 104 for enhanced stability of the spring and piston engagement.
  • Coil spring 106 continuously biases piston 100 towards the first channel opening 88.
  • a first limit position shown in figure 3, in which stud 102 abuts against first sealing plug 94. In this position, the piston 100 main body is located between the first and the second inner channels 82, 84, without blocking any of these two channels.
  • a high-pressure air flow runs through the bur air conduit 70 and communicates with piston channel 80 through first inner channel 82.
  • This high-pressure air flow biases piston 100 against the action of spring 106, towards a second limit position shown in figure 4.
  • the main body of piston 100 blocks the opening of the second inner water channel 84 to the piston channel 80, thus effectively preventing the water from flowing from water cooling conduit 72 to discharge conduit 76. Consequently, the water flowing in water cooling conduit 72 may flow to the handpiece and to the bur head, for accomplishing its cooling purpose by being atomized by the air flowing in the cooling air conduit 74.
  • valve member 48 of the invention water stagnation in the water tubes of the dental handpiece is completely obviated, which significantly hampers the microorganisms (in particular, bacteria) deposition and accumulation therein. Indeed, when the bur head 22, or more generally the dental handpiece 20, is not being used, the water continuously flows to be expelled through the discharge conduit and out into the local sewer outlet. This continuous water flow prevents the water from stagnating, and thus the water tubes become much less proper as a bacteria reproduction medium, since constantly flowing tap water is itself chemically treated with bactericidal agents, there is constant decontamination of the main tubing 24 and of the handpiece 20. It is understood that the water flow rate through the cooling water tube is very small, and thus no important water waste occurs due to the continuous water flow into discharge conduit 76.
  • valve member of the invention can be installed in a retro-fit fashion on existing tubing.
  • the conventional sockets provided on dental handpiece tubing are similar to the water circulation device of the present invention, to the exception that no water redirection occurs, since no transverse channels are provided therein.
  • the conventional sockets are simply installed on the tubing outlets to allow easy installation and removal of dental handpieces, to be replaced by other handpieces.
  • the conventional socket may be replaced by the water circulation device 26, which will also act as a socket for receiving the dental handpiece and connecting same to the tubing due to sleeve connector 56.
  • the conventional handpiece socket and the water circulation device of the invention.
  • FIGS. 6-13 show alternate embodiments of the invention.
  • the inline fluid conduits have been schematically shown as pipes, although it is understood that the preferred way to carry out the invention is to provide a full valve member body in which are pierced through-channels or conduits, due to manufacturing costs considerations of the valve member of such small dimension.
  • FIGs 6-8 schematically show a second embodiment of a valve member 150 according to the invention, through which extend a high-pressure bur air conduit 152, a cooling water conduit 154, a cooling air conduit 156 and a discharge conduit 158, as with the first embodiment of the invention.
  • a piston channel 160 transversely extends inside the main body of valve member 150, in which a piston 162 is slidable and continuously biased towards a first limit position, shown in figure 8, by a coil spring 164.
  • piston 162 comprises a first and a second spaced-apart cylinders 166, 168 integrally axially linked by a short spacer rod 170.
  • Figures 6-8 further show that the cooling water conduit is separated into two segments 154a and 154b located respectively downstream and upstream of piston channel 160, and both open into an intermediate portion of piston channel 160 in fluid connection therewith and in facing register with each other.
  • Valve member 150 comprises a first inner air channel 172 which links the high-pressure bur air conduit to a first extremity of piston channel 160; a second inner bypass channel 174 which links cooling water conduit 154 to an intermediate portion of piston channel 160; a third inner bypass channel 176 which links discharge conduit 158 to an intermediate portion of piston channel 160, in register with second inner channel 174; and a fourth inner channel 178, which links discharge conduit 158 to piston channel 160 at the second extremity thereof, opposite its first extremity.
  • Second cylinder 168 is positioned in register with the cooling water conduit downstream and upstream segments 154a, 154b and blocks same to prevent water from flowing from one to the other.
  • the water flowing in the cooling water conduit downstream segment 154a is redirected through second inner channel 174, passes into the piston channel 160 between the two piston cylinders 166,
  • valve member 150 When the dental handpiece 20 is not in use, there is a continuous water flow in valve member 150, to prevent water stagnation and microorganism build-up in the dental handpiece 20 and main tube 24.
  • a high-pressure air flow runs through the bur air conduit 152, and passes through the first inner channel 172 to bias piston 162 towards the piston channel second extremity, against the action of coil spring 164.
  • first cylinder 166 is located in register with the openings of second and third bypass channels 174, 176, to block same and consequently prevent access from one to the other through piston channel 160, while the piston second cylinder 168 frees the way between the cooling water conduit segments 154a, 154b to allow the cooling water to flow from one to the other.
  • the water can be fed to the handpiece bur head 22, to be being atomized by the cooling air flow and accomplish its cooling purpose.
  • the purpose of the fourth inner channel 178 is to allow air to be fed and evacuated between piston 162 and the piston channel 160 second extremity, during the translational movements of piston 162.
  • FIG 10 schematically shows the inline fluid circuit of a third embodiment of a valve member 200 according to the invention.
  • the valve member 200 comprises a pivotable actuator 212 which is pivotable inside an arcuate inner chamber 210.
  • Actuator 212 is full and comprises a first and a second inner passages 216, 218 therein.
  • the cooling water conduit is divided by chamber 210 into a downstream segment 204a and an upstream segment 204b.
  • a spring 214 biases actuator 212 into a first limit position in which the second inner passage 218 of actuator 212 comes in register with the downstream segment 204a of the cooling water conduit.
  • the cooling water is redirected through the elbowed second passage 218 of actuator 212, into chamber 210, out through a first inner channel 220 and into the discharge conduit 208.
  • the water can be continuously evacuated through discharge conduit 208 and continuous water flow is achieved, to prevent water stagnation.
  • a high- pressure air flow runs through the bur air conduit 202, through second inner channel 222 and into chamber 210, to pivotally bias actuator 212 against the action of spring 214 into a second limit position, in which the actuator first passage 216 comes in register with both the downstream and upstream segments 204a, 204b of the cooling water conduit to allow the water to flow through first passage 216 and to the dental handpiece.
  • FIG 11 schematically shows the inline fluid circuit of a fourth embodiment of a valve member 250 according to the invention.
  • the valve member 250 comprises an inner chamber 252 in which is slidable a block actuator 254 having a single passage 256 therein.
  • block actuator 254 is biased by a coil spring 258 so that the downstream segment 260a of the cooling water conduit communicate through chamber 252 with a first transverse inner channel 262 which in turn is connected to the discharge conduit 264.
  • block actuator 254 the water flows constantly through the water tubing, into the valve member to be dispatched through the discharge tube.
  • FIG. 12 schematically shows the inline fluid circuit of a fifth embodiment of a valve member 300 according to the invention.
  • the valve member 300 comprises an inner chamber 302 in which is pivotable an actuator 304 having a single passage 306 therein.
  • actuator 304 is pivotally biased by a coil spring 308 so that the downstream segment 310a of the cooling water conduit communicate through chamber
  • FIG. 13 schematically shows the inline fluid circuit of a sixth embodiment of a valve member 350 according to the invention.
  • the valve member 350 includes a piston channel 352 in which is slidable a piston 354 having two cylinders 356, 358 coaxially linked by an intermediate spacer rod 360, similar to the piston shown in the embodiment of figures 6-9.
  • Valve member 350 further includes a spring 362 continuously biasing piston 354 in a first limit position, in which piston 354 blocks with its first cylinder 356 the registering segments 364a, 364b of the cooling water pipe. In this first position of piston 354, the cooling water is redirected in a bypass channel 366, through piston channel 352, and into a discharge channel 368 and a discharge conduit 370.
  • piston 354 is biased against the action of spring 362 into a second limit position, in which the first cylinder 356 blocks bypass channel 366, and in which the cooling water is allowed to flow from the first segment 364a to the second segment 364b of the cooling water conduit, to feed the dental handpiece.
  • FIG. 1-5 show a valve member including several inner transverse channels, namely a piston channel 80, a first inner air channel 82, a second inner water channel 84, and a third inner discharge channel 86.
  • the water channel 84, the discharge channel 86 and the portion of the piston channel 80 which link the two former channels all form a bypass channel which may be identified as a single channel. It could be envisioned to design a valve member having a single bypass channel linking all three of the high-pressure air conduit 70, the water conduit 72 and the discharge conduit 76, to operatively move the piston in the bypass channel responsive to the air pressure in the high-pressure air conduit 70, and responsive to the bias of a coil spring.
  • any suitable biasing member of known construction such as an arm made of a resilient material or a blade spring, torsion spring or other biasing device, would also be acceptable. It could furthermore be envisioned that the piston or actuator be manually movable from its first to its second limit position, but this is not the preferred way to carry out the invention.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Oral & Maxillofacial Surgery (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)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Un dispositif de circulation d'eau comprend une soupape équipée de quatre conduits internes reliant chacun de manière exploitable des tuyaux respectifs à un porte-outil dentaire. De plus, un canal de dérivation est formé dans la soupape, entre le conduit d'eau d'élément de soupape et le conduit de décharge. Un piston peut être déplacé dans le canal de dérivation entre une première position d'écoulement dans laquelle l'eau peut s'écouler librement du conduit d'eau dans le conduit de décharge, et une deuxième position de fermeture dans laquelle le piston bloque le canal de dérivation de manière étanche aux fluides afin d'empêcher l'eau de s'écouler dans le conduit de décharge. Un ressort sollicite en continu le piston dans sa première position d'écoulement. De cette manière, quand le porte-outil ne fonctionne pas et qu'aucun écoulement d'air haute pression ne traverse le conduit d'air haute pression, l'eau peut s'écouler librement dans la soupape, du conduit d'eau dans le canal de décharge sans atteindre le porte-outil, et s'écouler en continu afin d'éviter que l'eau stagne.
PCT/CA2000/000071 2000-01-27 2000-01-27 Soupape de regulation d'eau pour porte-outil dentaire WO2001054611A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CA2000/000071 WO2001054611A2 (fr) 2000-01-27 2000-01-27 Soupape de regulation d'eau pour porte-outil dentaire
AU22730/00A AU2273000A (en) 2000-01-27 2000-01-27 Water valve for dental handpiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA2000/000071 WO2001054611A2 (fr) 2000-01-27 2000-01-27 Soupape de regulation d'eau pour porte-outil dentaire

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WO2001054611A2 true WO2001054611A2 (fr) 2001-08-02
WO2001054611A3 WO2001054611A3 (fr) 2002-10-17

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2462349A (en) * 2008-08-05 2010-02-10 Mark L Anderson Dental Handpiece Fluid Supply Technology
JP2014018672A (ja) * 2012-07-23 2014-02-03 Medtronic Gmbh 歯科用器具の供給管を供給及び制御ユニットと接続する連結装置
EP3037057A1 (fr) * 2014-12-22 2016-06-29 W & H Dentalwerk Bürmoos GmbH Pièce à main ou pièce coudée médicale, en particulier dentaire
JP2018000736A (ja) * 2016-07-06 2018-01-11 株式会社モリタ製作所 医療用装置および媒体導管セット
JP2020022888A (ja) * 2019-11-21 2020-02-13 株式会社モリタ製作所 医療用装置

Citations (1)

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Publication number Priority date Publication date Assignee Title
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Cited By (10)

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GB2462349A (en) * 2008-08-05 2010-02-10 Mark L Anderson Dental Handpiece Fluid Supply Technology
GB2462349B (en) * 2008-08-05 2012-08-29 Mark L Anderson Dental handpiece fluid supply technology
JP2014018672A (ja) * 2012-07-23 2014-02-03 Medtronic Gmbh 歯科用器具の供給管を供給及び制御ユニットと接続する連結装置
EP2689741A3 (fr) * 2012-07-23 2014-11-12 Medtronic GmbH Dispositif d'accouplement pour relier un tuyau d'alimentation pour des instruments de médecine dentaire à une unité d'alimentation et de commande
US9188265B2 (en) 2012-07-23 2015-11-17 Medtronic Gmbh Coupling device for connecting a supply tube for dental instruments with a supply and control unit
EP3037057A1 (fr) * 2014-12-22 2016-06-29 W & H Dentalwerk Bürmoos GmbH Pièce à main ou pièce coudée médicale, en particulier dentaire
WO2016102524A1 (fr) * 2014-12-22 2016-06-30 W & H Dentalwerk Bürmoos GmbH Pièce à main ou coudée médicale, en particulier dentaire
JP2018000736A (ja) * 2016-07-06 2018-01-11 株式会社モリタ製作所 医療用装置および媒体導管セット
EP3266404A3 (fr) * 2016-07-06 2018-04-11 J. Morita Manufacturing Corporation Dispositif médical et ensemble de conduit pour médium
JP2020022888A (ja) * 2019-11-21 2020-02-13 株式会社モリタ製作所 医療用装置

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AU2273000A (en) 2001-08-07

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