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WO2000066027A1 - Systeme de distribution de matiere d'impression entrainee par piston pneumatique direct - Google Patents

Systeme de distribution de matiere d'impression entrainee par piston pneumatique direct Download PDF

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Publication number
WO2000066027A1
WO2000066027A1 PCT/US2000/012144 US0012144W WO0066027A1 WO 2000066027 A1 WO2000066027 A1 WO 2000066027A1 US 0012144 W US0012144 W US 0012144W WO 0066027 A1 WO0066027 A1 WO 0066027A1
Authority
WO
WIPO (PCT)
Prior art keywords
viscous material
chamber
cylinder
extruding
valve
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/US2000/012144
Other languages
English (en)
Inventor
Raymond Bushnell
Sheri Gillett
Andras Hites
George Hites
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.)
MICRODENTAL LABORATORIES Inc
Original Assignee
MICRODENTAL LABORATORIES 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 MICRODENTAL LABORATORIES Inc filed Critical MICRODENTAL LABORATORIES Inc
Priority to US09/958,528 priority Critical patent/US6676408B1/en
Priority to AU49841/00A priority patent/AU4984100A/en
Publication of WO2000066027A1 publication Critical patent/WO2000066027A1/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
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A61C9/0006—Impression trays
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A61C9/0026—Syringes or guns for injecting impression material; Mixing impression material for immediate use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00503—Details of the outlet element
    • B05C17/00516—Shape or geometry of the outlet orifice or the outlet element

Definitions

  • the present invention is in the field of dental impression material handling systems.
  • models of a patient's teeth and gums are made so that accurate repair pieces can be made.
  • the models of teeth and gums are typically made by making a mold of the patient's mouth.
  • a tray having a "U" shaped cross section is connected via tubes to an impression material injection system.
  • the tray is placed in the patient's mouth and impression material is injected through the tube into the tray until the teeth and gums are surrounded. After the impression material hardens the tray is removed from the patient's mouth forming a mold of the patient's mouth. The hardened mold is then used to make a positive of the patient's mouth.
  • the impression material is typically stored as two separate flowable components which are mixed together just before being injected into the dental tray. After mixing, the impression material has a working time during which the mixture remains a flowable material and can be manipulated and a set time after which the impression material polymerizes or rubberizes. The time after the impression material is mixed is monitored so that adjustments to the tray and impression material are not made after the working time has expired. The impression material polymerizes or rubberizes and after the set time has elapsed the tray can be removed from the patient's mouth.
  • the impression material may be a silicone or any other suitable material.
  • the working time, set time and viscosity are characteristics of the impression material that are specified in literature supplied by the manufacturer.
  • the working time is typically 1.5 to 2.5 minutes and the set time is 2.25 to 5 minutes.
  • Dental impression material is currently available in either cartridge or pouch dispensers of various standard volumes, including: 25, 50 and 75 milliliters.
  • U.S. Patent No. 4,472,141 discloses several mechanical devices including: levers, ratchets and gears/screws which drive a plunger into a barrel which may contain a dental impression material.
  • the use of these mechanical devices applied to dental impression applications is problematic because the flow of impression material is a function of the force exerted by the operator. It may be difficult for the operator to regulate the mechanical device force so that an even flow of material is produced.
  • Electric motors may be used to extrude impression material from a dispenser.
  • a manual switch controls the motor and movement of the piston and the flow of impression material from the dispenser.
  • Pressurized gas systems have also been developed for the extrusion of dental impression material.
  • U.S. Patent No. 5,370,533 discloses a mechanism which uses pressurized gas to move a piston and drive a rod into a dispenser which extrudes impression material through a tube to a dental tray.
  • Pressurized gas systems can be large heavy floor mounted systems which are connected to the dental tray with a long tube. The time required for the impression material to flow through the tube to the dental tray reduces the available working time of the impression material.
  • a problem with viscous material extrusion devices is that the working and set times must be monitored by a separate timer or clock. What is needed is a system that incorporates a timer to keep track of the working and set times of the material immediately after the components are mixed. What is also needed is a compact light weight system which can be placed close to the tray so that the viscous material can be delivered to the tray without travelling through a long tube which consumes the working time wastes .
  • the present invention is a light weight portable impression material dispensing system used to inject impression material into dental trays to make molds of a patient's mouth.
  • the inventive system utilizes pressurized gas to move one or more pneumatic cylinders which drive two rods into a two cylinder dispenser.
  • Each cylinder of the dispenser contains a different material component.
  • the two material components are mixed and extruded through a tube connected to a dental tray.
  • a timer incorporated into the inventive system monitors the time after the material components have been mixed and inform the operator of the remaining working time and set time of the material.
  • switches used to control the flow of material are mounted in a hand grip attached to the injection system so that the entire system is held and controlled by one hand.
  • the system is a table top unit which is also controlled with one hand.
  • Fig. 1 illustrates a cross section view of the impression material system
  • Fig. 2 illustrates a cross section view of the impression material system
  • Fig. 3 illustrates an embodiment of the impression material system with a handle
  • Fig. 4 illustrates another embodiment of the impression material system.
  • the body 101 houses a cylinder 103, a piston 109 and two rods 105, 107.
  • the piston 109 and rods 105, 107 are movable between extended and retracted positions within the cylinder 103 having a front end 113 and a back end 111.
  • Fig. 1 an embodiment of the present invention is illustrated.
  • the body 101 houses a cylinder 103, a piston 109 and two rods 105, 107.
  • the piston 109 and rods 105, 107 are movable between extended and retracted positions within the cylinder 103 having a front end 113 and a back end 111.
  • the system 100 is illustrated with the piston 109 at the back end 111 of cylinder 103 and the ends of rods 105, 107 retracted within the front surface of the body 101.
  • the cylinder 103 may have a circular, rectangular, hexagonal or any other suitable cross section.
  • a dispenser 121 having a flanged end 123 can be attached to a grooved fitting at the front surface of the body 101.
  • the dispenser 121 has a first chamber 125 containing a first component 128 of the impression material and a second chamber 127 which contain second component 129 of the impression material.
  • the first chamber 125 is aligned with rod 105 and the second chamber 127 is aligned with rod 107.
  • the first chamber 125 and second chamber 127 converge at junction 131 which is connected to a tube 133 which is connected to a dental tray 135.
  • the dispenser 121 is an off the shelf stock item which is typically either a cartridge or pouch configuration.
  • the illustrated embodiments show the cart- '.!ge type dispensers 121 which have a flanged end 123 which engages grooves in the body 101, however the inventive system 100 is also compatible other types of material containers.
  • a pouch containing material 130 or the raw material 130 may be placed in a chamber(s) adjacent to the rods 105, 107.
  • the chamber may be configured such that when the rods 105, 107 enter the chamber(s) the material 130 flows through the tube 133 into the dental tray 135.
  • the piston 109 and rods 105, 107 are moved within the cylinder 103 by actuating either an extension valve 143 or a retraction valve 145.
  • the extension valve 143 and the retraction valve 145 are three way valves which are connected to a pressurized gas source 151.
  • the actuation valve 143 is connected to the back end 111 of cylinder 103 and the retraction valve 145 is connected to the front end 113 of cylinder 103. In their normal positions, the extension valve 143 and retraction valve 145 block the flow of gas from the pressurized gas source 151 and vent the ends of the cylinder 103 to ambient.
  • the pressurized gas source 151 is compressed air commonly used in a dental examination room.
  • Other suitable pressurized gas sources 151 include: pressurized nitrogen, air and mixtures of inert gases.
  • Switches 147, 149 are used to actuate the extension valve 143 and the retraction valve 145, respectively.
  • the connection between the switches 147, 149 and the valves 143, 145 may be: mechanical, electrical, pneumatic or any other suitable interface.
  • the switches 147, 149 are push buttons mechanically or electrically connected to the extension valve 143 and the retraction valve 145.
  • the dispenser 121 may only be attached to or removed from the body 101 when the rods 105, 107 are fully retracted.
  • pressurized gas flows from the pressurized gas source 151 into the front end of cylinder 103.
  • the differential pressure across the piston 109 moves it towards the back end 111 of the cylinder 103 retracting the rods 105, 107.
  • Pressure at the back end 111 of the cylinder does not build because the extension valve 143 vents this volume to atmosphere.
  • the piston 109 stops at the end of the cylinder 103 with the ends of the rods 105, 107 fully retracted within the body 101.
  • the piston 109 fits closely within the cylinder 103.
  • the inner surface of the cylinder 103 may be coated with well known lubricants so that the piston 109 slides smoothly between the front end 113 and the back end 111 of the cylinder 103.
  • an O-ring 161 may be mounted around the circumference of the piston 109. The O-ring 161 slides against the inner lubricated surface of the cylinder 103 as the piston 109 moves and is compressed between the piston 109 and cylinder 103 forming a gas tight seal which prevents gas from flowing around the piston 109. Because the rods 105, 107 travel through the front end of cylinder 103, similar O-rings 163 may be mounted in the body 101 around the rods 105, 107.
  • the O-rings 161, 163 may be made of rubber, plastic or any other suitable material.
  • the piston 109 fits closely within the cylinder 103 and the rods 105, 107 fit closely with the body 101 such that a substantial amount of gas does not flow through the cylinder 103, it is not necessary for the system 100 to have O-rings 161, 163.
  • the use of O-rings 161, 163 assists in controlling the rate of movement of the piston 109 within the cylinder 103.
  • the piston 109 does not move freely within the cylinder 103 due to the friction caused by the sliding of O-rings 161, 163. More specifically, the rate of movement of the piston 109 through the cylinder 103, will be substantially uniform as long as the differential pressure across the piston 109 is between 25 and 45 psi.
  • Gas pressure into the back end 111 of the cylinder 103 can be regulated by a flow restricting orifice and a pressure relief valve located downstream of the extension valve 143.
  • the pressure relief is set to approximately 45 psi.
  • the gas seal mechanisms for the piston 109 and rods 105, 107 have been described as O-rings 161, 163, any other well known and suitable seal may be used including: bellows, lip seals, gaskets, bushings and sleeves.
  • Fig. 2 illustrates the impression material dispensing system 100 in the extended position.
  • the extension valve 143 is actuated pressurized gas flows from the pressurized gas source 151 into the back end 111 of cylinder 103.
  • the differential pressure across the piston 109 moves it towards the front end 113 of cylinder 103 pushing rod 105 into the first chamber 125 and rod 107 into the second chamber 127 of the dispenser 121.
  • the first component 128 in the first chamber 125 and second component 129 in the second chamber 127 are mixed in the junction 131 forming a viscous material 130 which flows through the tube 131 into the dental tray 135 placed within a patient's mouth.
  • the operator turns off the extension valve 143 which stops the movement of the piston 109 and the flow of viscous material 130 into the dental tray 135.
  • the piston 109 and rods 105, 107 are retracted so that the dispenser can be removed and
  • inventive system 100 may mix the first component and the second component at any other ratio. Specifically, if a larger percentage quantity of the first component 128 is desired, the first chamber 125 can be a wider diameter than the second chamber 127 and the rod 105 can similarly be a wider diameter than the rod 107. By adjusting the cross sectional areas of the first chamber 125 and the second chamber 127, the mix ratio of the first component 128 and the second component 129 can controlled.
  • the viscous material 130 may have specific working and set times which begin as soon as the first component 128 and second component 129 are mixed. Adjustments can be made to the dental tray 135 before the working time of the impression material 130 has expired but the mold may be damaged by movement of the dental tray 135 after the impression material begins to polymerize or rubberize. When the viscous material 130 has fully hardened and the dental tray 135 is removed from the patient's mouth. The impression of the patient's mouth remains in the hardened impression material 130 forming a mold which may be used to make a replica of the teeth and gums.
  • a programmable timer 141 having a display may be built into the body 101 which can be programmed with the working time and set time of the impression material 130 being used. After the extension valve 143 is actuated and the viscous material 130 is mixed, the timer 141 is started and the elapsed time is displayed in digital or analog form so that the working and set times can be monitored by the operator. As discussed, the dental tray 135 and viscous material 130 can be moved during the working time, but should not be moved after the working time has elapsed. The dental tray 135 may be removed from the patient's mouth once the viscous material 130 after the set time has elapsed.
  • a single button starts both the working and set timers and both the remaining working and set times are displayed.
  • the timer 141 start button may be connected to the extension valve 143, such that when the extension valve 143 is actuated, the timer 141 starts and when the retraction valve 145 is actuated, the timer stops and resets.
  • a speaker may also be connected to the timer 141 so that audible signals may be emitted during the timing process to notify the user of the elapsed time or remaining working and set times.
  • the timer 141 may have two independent start buttons for the working and set times. Separate timers may be necessary when a substantial amount of time is required to fill the dental tray 135 with viscous material 130.
  • the working timer may be started as soon as the viscous material 130 leaves dispenser 121 so that the adjustments are not made after the initial viscous material 130 enters the dental tray 135 and begins to solidify.
  • the set timer may be started later, after the dental tray 135 has been filled with impression material 130 because the dental tray 135 should not be removed until all of the impression material 130 has hardened.
  • extension valve 143 and retraction valve 145 is illustrated as being housed in a handle 303 attached to the body 101 which allows the operator to hold the viscous material injection system 300.
  • extension valve 143 and retraction valve 145 are actuated by switches 147 and 149, respectively, that are built into the handle 203.
  • the switches 147 and 149 are actuated by the operator's grip hand fingers.
  • a timer 141 may be mounted on the back of the body 101 allowing the elapsed time to be seen by the operator during viscous material 130 injection.
  • the retraction valve 145 is typically only utilized to remove or replace dispensers after impression material has been injected into the dental tray in the patient's mouth.
  • the switch 149 is recessed in the handle 303 to prevent it from being accidentally pressed and actuating the retraction valve 145.
  • switches 147 and 149 and timer 141 are mounted on top of the body 101.
  • the impression material injection system is controlled with switches 147 and 149.
  • the switches 147 and 149 may be mounted on a remote foot pedal allowing actuation of extension valve 143 and retraction valve 145 with the operator's feet. Actuation signals are then sent from the foot pedals to the extension valve 143 and retraction valve 145 via wires, radio signal, pneumatic tubing or any other suitable signal transmission means.
  • the timer 141 may be located remotely from the impression material injection system 400.
  • Switches 147 and 149 may be electrical switches that are used to actuate electrically operated solenoid valves or other electrically actuated valves. It is also contemplated that the switches 147 and 149 may be pneumatic switches connected to actuators mounted on the valves 147 and 149.
  • the inventive system is used for dentistry and may be exposed to various chemicals commonly found in a dentist's office.
  • the external surfaces of the inventive apparatus are made of chemical resistant materials.
  • the inventive impression material dispensing system is made of injection molded plastic which is not affected by exposure to: formaldehyde, alcohol, glutaraldehyde, fenoliz components, quantiarium ammonia, hydrochloric acid, phenylphenol, chlorophenol as well as any other chemicals used in the medical profession and equipment sterilization processes.
  • a viscous material dispensing system has been described as a dental impression material handling system.
  • inventive system may be used for other applications including: mold making, adhesives, epoxies, resins, cement, catalysts, ear, nose and throat medical applications. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense.

Landscapes

  • Health & Medical Sciences (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 Preparations (AREA)

Abstract

L'invention concerne un système (100) de distribution de matière visqueuse utilisant du gaz sous pression dirigé vers une extrémité d'un ensemble piston (109) et cylindre (103) pour extruder la matière d'impression (128, 129) provenant d'un distributeur (121) à travers un tuyau (133) et dans un porte-empreinte (135) dentaire, cette matière durcissant pour former un moule de la bouche du patient. Le mouvement du piston (109) est commandé par des interrupteurs (147, 149) qui règlent des soupapes (143, 145) de gaz dirigeant le gaz sous pression vers un côté ou l'autre du piston (109). Une minuterie (141) est incorporée dans le système (100) de distribution de matière pour surveiller le temps de travail et le temps de durcissement de la matière d'impression (128, 129) après son injection dans le porte-empreinte (135) dentaire.
PCT/US2000/012144 1999-05-04 2000-05-04 Systeme de distribution de matiere d'impression entrainee par piston pneumatique direct Ceased WO2000066027A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US09/958,528 US6676408B1 (en) 1999-05-04 2000-05-04 Direct pneumatic piston driven impression material dispensing system
AU49841/00A AU4984100A (en) 1999-05-04 2000-05-04 Direct pneumatic piston driven impression material dispensing system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13251799P 1999-05-04 1999-05-04
US60/132,517 1999-05-04

Publications (1)

Publication Number Publication Date
WO2000066027A1 true WO2000066027A1 (fr) 2000-11-09

Family

ID=22454406

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/012144 Ceased WO2000066027A1 (fr) 1999-05-04 2000-05-04 Systeme de distribution de matiere d'impression entrainee par piston pneumatique direct

Country Status (2)

Country Link
AU (1) AU4984100A (fr)
WO (1) WO2000066027A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7226477B2 (en) 2002-11-15 2007-06-05 Advanced Cardiovascular Systems, Inc. Apparatuses and methods for heart valve repair

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704088A (en) * 1984-04-27 1987-11-03 Newman Martin H Dental materials dispenser and applicator
US4991755A (en) * 1987-11-02 1991-02-12 Stephen Grusmark Toothpaste dispenser with timer assembly
US5370533A (en) * 1993-11-08 1994-12-06 Bushnell; Raymond B. Dental impression tray assembly and method of taking impressions
US5722829A (en) * 1995-02-27 1998-03-03 Minnesota Mining & Manufacturing Co. Cartridge dispensing system for dental material
US5816445A (en) * 1996-01-25 1998-10-06 Stainless Steel Coatings, Inc. Method of and apparatus for controlled dispensing of two-part bonding, casting and similar fluids and the like

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704088A (en) * 1984-04-27 1987-11-03 Newman Martin H Dental materials dispenser and applicator
US4991755A (en) * 1987-11-02 1991-02-12 Stephen Grusmark Toothpaste dispenser with timer assembly
US5370533A (en) * 1993-11-08 1994-12-06 Bushnell; Raymond B. Dental impression tray assembly and method of taking impressions
US5722829A (en) * 1995-02-27 1998-03-03 Minnesota Mining & Manufacturing Co. Cartridge dispensing system for dental material
US5816445A (en) * 1996-01-25 1998-10-06 Stainless Steel Coatings, Inc. Method of and apparatus for controlled dispensing of two-part bonding, casting and similar fluids and the like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7226477B2 (en) 2002-11-15 2007-06-05 Advanced Cardiovascular Systems, Inc. Apparatuses and methods for heart valve repair

Also Published As

Publication number Publication date
AU4984100A (en) 2000-11-17

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