Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
  • A61M5/2448—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic comprising means for injection of two or more media, e.g. by mixing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
  • B65D25/02—Internal fittings
  • B65D25/04—Partitions
  • B65D25/08—Partitions with provisions for removing or destroying, e.g. to facilitate mixing of contents
  • B65D25/082—Partitions with provisions for removing or destroying, e.g. to facilitate mixing of contents the partition being in the form of a plug or the like which is removed by increasing or decreasing the pressure within the container
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C5/00—Filling or capping teeth
  • A61C5/50—Implements for filling root canals; Methods or instruments for medication of tooth nerve channels
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C5/00—Filling or capping teeth
  • A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
  • A61C5/62—Applicators, e.g. syringes or guns
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/31—Details
  • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
  • A61M5/31596—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms comprising means for injection of two or more media, e.g. by mixing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
  • B65B3/003—Filling medical containers such as ampoules, vials, syringes or the like
  • B65B3/006—Related operations, e.g. scoring ampoules
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
  • B65D77/04—Articles or materials enclosed in two or more containers disposed one within another
  • B65D77/048—Articles or materials enclosed in two or more containers disposed one within another the inner and outer containers being rigid and the outer container being of curved cross-section, e.g. cylindrical
  • B65D77/0486—Articles or materials enclosed in two or more containers disposed one within another the inner and outer containers being rigid and the outer container being of curved cross-section, e.g. cylindrical the inner container being coaxially disposed within the outer container
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D83/00—Containers or packages with special means for dispensing contents
  • B65D83/76—Containers or packages with special means for dispensing contents for dispensing fluent contents by means of a piston
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining

Definitions

• the present application is directed to devices and methods for mixing, storing and dispensing two-part dental compositions.
• a and B components Many chemical formulations are packaged in two initially separate parts, often known as A and B components. Separate storage of the A and B components is often necessary where the composition resulting from mixing is unstable over time.
• a self-etching dental primer composition may be provided in two initially separate parts to prevent the acid component from slowly destabilizing the polymerizable resin component by hydrolyzing off the functional group(s) to which the backbone of the resin is chemically bonded. Although such destabilization may not occur immediately upon mixing, with many such compositions, it is often recommended that the composition be used up or discarded within a certain time period (e.g., 30, 60, or 90 days) after initial mixing.
• the present invention is directed to a hollow inner plunger for use within a syringe-in-syringe mixing system for mixing a two-part dental composition.
• the hollow inner plunger includes a body having a continuous cylindrical wall defining an internal chamber for containing a first component.
• the body includes a proximal end and a distal end.
• a sealing plug and rupturable membrane are disposed at the distal end of the body, and the sealing plug and rupturable membrane are integrally formed together as a single piece (e.g., formed of a single piece of elastomeric material).
• the integral sealing plug and rupturable membrane provide a simple, low-cost way to ensure initial separation of the two-parts of a two-part dental composition within the syringe-in-syringe mixing system, while also minimizing and/or preventing contamination that may otherwise occur if the rupturable membrane were to comprise a separate part bonded to the distal end of the hollow inner plunger.
• any bonding adhesive used to bond a membrane may be contaminated or chemically attacked by one or both of the components separated by the rupturable membrane causing weakening or failure of the bond (e.g., during storage).
• the composition may contaminate the wall or other surface to which the membrane is to be bonded, which may inhibit formation of a strong bond.
• any bonding adhesive may likewise contaminate or chemically react with one or both of the two components to be separated, which may render the mixed composition less effective or otherwise unsuitable for use. Therefore, providing an integral sealing plug and rupturable membrane not only reduces the number of parts and steps required in assembly, but also reduces the likelihood of contamination of the two-part composition or any bonding adhesive.
• the hollow inner plunger may comprise part of an associated syringe-in- syringe mixing system for use in mixing and dispensing a two-part dental composition.
• a system includes a first plunger, the hollow inner plunger as described above, and a syringe barrel configured to contain a second component.
• the first plunger When assembled, the first plunger is slidably disposed in sealing engagement within the hollow inner plunger, and the hollow inner plunger is slidably disposed in sealing engagement within the syringe barrel.
• the first component is initially stored within the chamber of the inner hollow plunger separate from the second component which is stored within the chamber of the syringe barrel.
• the two chambers are initially separated by the rupturable membrane.
• the internal chamber of the hollow inner plunger has a diameter at the distal end of the body that is less than a diameter of the chamber at the proximal end.
• this narrowing of diameter occurs near the distal end of the body (e.g., adjacent to or near a proximal end of the integral sealing plug/rupturable membrane). Narrowing the diameter of the chamber significantly increases the pressure exerted by the first component against the rupturable membrane, which has been found to greatly aid in causing rupture of the membrane in such a way that results in jetting of the first component into the second component. The result of such jetting action is near instantaneous mixing of the two components, particularly for two relatively low viscosity liquids.
• the internal diameter at the distal end is preferably not more than about 75% of the largest diameter of the chamber (e.g., the diameter at the proximal end), more preferably not more than about 50% of the largest diameter of the chamber (e.g., the diameter at the proximal end), and most preferably not more than about 35% of the largest diameter (e.g., the diameter at the proximal end).
• a diameter at the distal end i.e., adjacent the rupturable membrane
• the largest diameter of the chamber e.g., the diameter from the proximal end to a location adjacent the sealing plug where the diameter is abruptly narrowed
• the actual thickness of the rupturable membrane depends on the strength and other physical properties of the selected material, along with the configuration of any reduction in diameter leading up to the proximal end of the body where the membrane is located.
• the rupturable membrane preferably has a thickness ranging from about 0.0005 inch to about 0.04 inch, more preferably from about 0.002 inch to about 0.025 inch, and most preferably from about 0.005 inch to about 0.015 inch.
• a thermoplastic elastomer material having a thickness from about 0.005 inch to about 0.010 inch is particularly preferred for the reasons described above when the diameter of the internal chamber is reduced adjacent the distal end to about one-third of its value at the proximal end.
• Figure IA is a perspective view of an exemplary hollow inner plunger including an integrally formed sealing plug and rupturable membrane
• Figure IB is a close up cross-sectional view of a distal end of the hollow inner plunger including the integral sealing plug and rupturable membrane of Figure IA;
• Figure 1 C is a close up cross-sectional view of an alternative hollow inner plunger including an internal chamber of substantially constant diameter along its entire length;
• Figure 2 is a perspective view of an exemplary syringe-in-syringe mixing system incorporating a hollow inner plunger according to the present invention;
• Figure 3A is a perspective view of an exemplary first plunger for use in a syringe-in-syringe mixing system, the first plunger including an exemplary locking mechanism to prevent pull-out of the first plunger once it has been fully inserted within the hollow inner plunger;
• Figure 3B is a perspective view of an alternative first plunger including an alternative locking mechanism;
• Figures 3C-3D illustrate an alternative embodiment in which the integral sealing plug and rupturable membrane may be incorporated within a syringe-to- syringe mixing system
• Figure 4A illustrates the first plunger being pressed into the hollow inner plunger so as to cause the rupturable membrane at the distal end of the hollow inner plunger to break, resulting in jet mixing of the first component into the second component;
• Figure 4B illustrates the first plunger in a locked configuration relative to the hollow inner plunger so as to prevent pull-out of the first plunger from the hollow inner plunger;
• Figure 4C illustrates dispensing of a portion of the mixed two-part composition onto a pad for subsequent application to a desired surface.
• the present invention is directed to a hollow inner plunger for use within a syringe-in-syringe mixing system for mixing a two-part dental composition.
• the hollow inner plunger includes a body having a continuous cylindrical wall defining an internal chamber for containing a first component.
• the body includes a proximal end and a distal end.
• a sealing plug and rupturable membrane are disposed at the distal end of the body, and the sealing plug and rupturable membrane are integrally formed together as a single piece (e.g., formed of a single piece of elastomeric material).
• the hollow inner plunger may comprise part of an associated syringe-in- syringe mixing system for use in mixing and dispensing a two-part dental composition.
• a system includes a first plunger, the hollow inner plunger as described above, and a syringe barrel configured to contain a second component.
• the first plunger When assembled, the first plunger is slidably disposed in sealing engagement within the hollow inner plunger, and the hollow inner plunger is slidably disposed in sealing engagement within the syringe barrel.
• the first component is initially stored within the chamber of the inner hollow plunger separate from the second component which is stored within the chamber of the syringe barrel.
• the two chambers are initially separated by the rupturable membrane.
• Figure IA is a perspective view of hollow inner plunger 100 having a body including a continuous cylindrical wall 102.
• the body and wall 102 include a proximal end 104 and an opposite distal end 106.
• the interior of wall 102 defines an internal chamber 108 configured to contain a first component HOa.
• a flange 112 is disposed at proximal end 104, while an integrally formed sealing plug and rupturable membrane 116 is disposed at distal end 106.
• sealing plug 114 and membrane 116 are integrally formed as a single piece, for example, from an elastomeric material.
• Rupturable membrane 116 caps and seals off the distal end of hollow inner plunger 100 so as to contain first component HOa within chamber 108, keeping it separate from a second component until the user desires to effect mixing.
• Sealing plug 114 is disposed on the outside of body wall 102 and is configured to plug within a syringe barrel (see Figure 2) so as to seal the proximal end of the syringe barrel when the hollow inner plunger 100 is assembled into a syringe-in-syringe mixing system.
• sealing plug 114 includes an outwardly extending annular ridge 118 that prevents plug 114 from being separated from hollow inner plunger 100 during rupture of rupturable membrane 116.
• Sealing plug 114 includes a corresponding annular groove 120 configured to matingly engage ridge 118 so as to securely attach sealing plug and rupturable membrane 116 to the body of hollow inner plunger 100.
• Sealing plug 114 and rupturable membrane 116 may advantageously be formed of an elastomeric material (e.g., a thermoset elastomer or thermoplastic elastomer), which advantageously provides an excellent seal against a syringe barrel while also providing a desired strength to rupturable membrane 116.
• Rupturable membrane 116 seals off the distal end of hollow inner plunger 100, separating first component 110a from a second component 110b contained within a syringe barrel 128 (see Figure 2) until the user intentionally ruptures membrane 116, causing first component 110a to be forced into syringe barrel 128, where the two components are mixed together.
• sealing plug 114 and rupturable membrane 116 that are integral so as to comprise a single piece of material greatly simplifies the mass manufacture of the hollow inner plunger 100 and a syringe-in-syringe mixing system of which it forms a part.
• the integral sealing plug 114 and rupturable membrane 116 provide a simple, low-cost way to ensure initial separation of the two-parts of a two-part dental composition within a syringe-in-syringe mixing system, while also minimizing and/or preventing contamination that may otherwise occur if the rupturable membrane 116 and sealing plug 114 were to comprise two separate parts requiring bonding of each to the body or wall 102.
• any bonding adhesive used to bond a rupturable membrane to wall 102 may be contaminated or chemically attacked by one or both of the components separated by the rupturable membrane (e.g., during storage). Such contamination or chemical reaction would likely lead to weakening and/or failure of the bond holding the membrane in place.
• the composition may contaminate the wall or other surface to which the membrane is to be bonded, which may inhibit formation of a good bond.
• any bonding adhesive may likewise contaminate or chemically react with one or both of the two components intended for separation within a syringe-in-syringe mixing system, which may render one component, both components, or the mixed composition less effective or otherwise unsuitable for use. Therefore, providing an integral sealing plug and rupturable membrane not only reduces the number of parts and steps required to assemble a hollow inner plunger and an associated syringe-in-syringe mixing system, but also reduces the likelihood of contamination of the two-part composition or any bonding adhesive, either of which could render the mixing system and/or composition useless.
• Figures IB and 1C illustrate cross-sectional views of alternative embodiments.
• Figure IB illustrates an example in which the inside diameter of the chamber 108 is reduced adjacent to rupturable membrane 116
• Figure 1C illustrates an alternative example in which the diameter D of the chamber 108' is not reduced, but is substantially constant along the length of the chamber 108' so that the diameter D adjacent membrane 116' and plug 114' is substantially the same as the diameter D elsewhere along chamber 108'.
• Figure IB shows a preferred embodiment in which the internal chamber 108 of hollow inner plunger 100 has a diameter Ds at distal end 106 of the body that is less than a diameter D L of the chamber at proximal end 104. As illustrated, preferably this narrowing of diameter occurs near the distal end 106 of the body. For example, in the illustrated embodiment, the narrowing of the chamber diameter occurs adjacent or near the proximal edge of the sealing plug 114.
• Reducing the outside diameter of the body wall 102 along this distal portion also provides space for the receipt of sealing plug 114 in a way that presents an overall outside diameter of the plunger 100 that is substantially constant along the entire length (i.e., between proximal end 104 adjacent flange 112 and distal end 106), with the exception of primary and secondary sealing surfaces 122a and 122b, respectively, which are configured to seal against the inside surface of a syringe barrel.
• Such an arrangement provides a tight fit of the inner plunger 100 within a syringe barrel (e.g., see Figure 2), reducing any tendency of the inner plunger to wobble within the syringe barrel, which tendency may become particularly pronounced further away from the sealing surfaces 122a and 122b (e.g., near proximal end 104).
• narrowing the diameter of chamber 108 significantly increases the pressure exerted by first component 11 Oa against rupturable membrane 116, when force is selectively applied by a user to a plunger inserted within proximal end 104. Narrowing of diameter has been found to greatly aid in causing rupture of membrane 116 in such a way that results in jetting of first component HOa into second component 110b. The result of such jetting action is near instantaneous mixing of the two components, particularly for two relatively low viscosity liquids.
• the internal diameter Ds at the distal end 106 is preferably not more than about 75% of the diameter D L at proximal end 104 and along the remainder of chamber 108, more preferably not more than about 50% of the diameter D L , and most preferably not more than about 35% of the diameter D L .
• a diameter at the distal end i.e., adjacent the rupturable membrane measuring about one-third that of the largest diameter of the chamber (e.g., the diameter is substantially constant from the proximal end 104 to a location adjacent the sealing plug 114 where the diameter is abruptly narrowed) results in catastrophic rupture of the membrane and jetting of substantially all of the first component 110a through the rupturable membrane 116 and into the second component to effect homogeneous mixing.
• the actual thickness of rupturable membrane 116 depends on the strength and other physical properties of the selected material, along with the configuration of any reduction in diameter leading up to the proximal end of the body where the membrane is located.
• the rupturable membrane preferably has a thickness ranging from about 0.0005 inch to about 0.04 inch, more preferably from about 0.002 inch to about 0.025 inch, and most preferably from about 0.005 inch to about 0.015 inch.
• a rupturable membrane formed of a thermoplastic elastomer material having a thickness from about 0.005 inch to about 0.010 inch is particularly preferred for the reasons described above when the diameter Ds of the internal chamber 108 is reduced adjacent the distal end 106 to about one-third of its value at the proximal end 104.
• FIG. 2 illustrates an exemplary syringe-in-syringe mixing system 124.
• System 124 includes a first plunger 126, a hollow inner plunger 100, and a syringe barrel 128 with a cap 130 at a distal end of syringe barrel 128 (a plug fitting inside the distal end of barrel 128 could equivalently be used).
• First plunger 126 is slidably disposed within hollow inner plunger 100, which is slidably disposed within syringe barrel 128.
• hollow inner plunger 100 contains a first component 110a
• syringe barrel 128 contains a second component 110b.
• First plunger 126 includes an elongate stem 132 and an associated sealing plug 134 at a distal end of stem 132.
• a locking mechanism 136 may advantageously be included near a proximal end of first plunger 126 to prevent withdrawal of first plunger 126 from inner plunger 100 once inserted. Such a locking mechanism is helpful as once the membrane is ruptured, the device cannot be reused for mixing two components, although it can be used to dispense the mixed composition until all has been dispensed.
• Locking first plunger within inner plunger 100 allows the dispensing device to operate as a syringe comprising a barrel and plunger, which simplifies dispensing by the user while also preventing slideout of the first plunger, which could result in loss, contamination or waste of the mixed composition.
• Illustrated locking mechanism 136 comprises a circumferentially extending portion of enlarged diameter 138 (relative to the remainder of stem 132), with a plurality of longitudinally extending interlock ribs 140. In use, interlock ribs 140 are inserted into hollow inner plunger 100, where the ribs 140 bias against the inside wall 102 of hollow inner plunger 100.
• the system is configured such that when first plunger 126 is fully inserted into hollow inner plunger 100, circumferentially extending portion 138 rests within flange 112 of hollow inner plunger 100, while interlock ribs 140 extend distally into hollow inner plunger 100, past flange 112. Because flange 112 provides increased barrel strength relative to the remainder of hollow inner plunger 100, little or no deformation occurs to the inside wall of hollow inner plunger 100 on account of portion 138, but deformation is caused by ribs 140, resulting in associated indentations being formed into the inside wall 102 of hollow plunger 100 distal to flange 112, preventing, or at least inhibiting, later removal of first plunger 126 from hollow inner plunger 100 (e.g., see Figure 4D).
• Figure 3B illustrates an alternative first plunger 126' including a cylindrical elongate stem 132, and a sealing plug 134.
• first plunger 126' includes an alternative locking mechanism 136' comprising an annular interlock ring 140' rather than the enlarged diameter portion 138 and plurality of interlock ribs 140 of the embodiment of Figure 3 A.
• annular interlock ring 140' causes the formation of an indentation or groove within the inside wall 102 of hollow inner plunger 100.
• Annular interlock ring 140' resides in the formed groove, preventing, or at least inhibiting, pull out of first plunger 126 once fully inserted into hollow inner plunger 100.
• Other locking mechanisms e.g., an interference fit of the first plunger into the hollow inner plunger may alternatively be used.
• a pre -measured, pre-filled syringe-in-syringe mixing system may be manufactured by first inserting first plunger 126 into hollow inner plunger 100 so that first plunger 126 is slidably received within hollow inner plunger 100. Sealing plug 134 of first plunger 126 seals the proximal end of hollow inner plunger. First component HOa may then be introduced into internal chamber 108 of hollow inner plunger 100. Integrally formed rupturable membrane 116 and sealing plug 114 may then be placed over distal end 106 of hollow inner plunger 100, effectively sealing first component HOa within chamber 108.
• hollow inner plunger 100 may be inserted into syringe barrel 128 so that hollow inner plunger 100 is slidably received therein.
• Second component HOb may then be introduced into syringe barrel 128 through the distal end of the barrel.
• Cap 130 may finally be placed over the distal end of barrel 128 so as to seal the distal end. Assembly in such a manner prevents or at least minimizes the formation and entrapment of air bubbles within the chamber of the inner plunger 100 and/or the syringe barrel 128, and is thus currently preferred.
• Figures 3C-3D illustrate an alternative embodiment in which the integral sealing plug and rupturable membrane may be incorporated within a syringe-to- syringe mixing system 224.
• Figure 3C illustrates a cross-sectional view of alternative syringe barrel 200 similar to those illustrated in Figures IB-I C including a continuous cylindrical wall 202 which defines an internal chamber 208 configured to contain a first component.
• syringe barrel 200 is not configured to slide within a syringe barrel, but rather to be coupled to another syringe barrel so as to allow syringe-to-syringe mixing (as opposed to syringe-in-syringe mixing), as shown in Figure 3D.
• Syringe barrel 200 includes means for coupling to another syringe barrel.
• a female portion of a coupling mechanism is disposed at the distal end of barrel 200.
• a cylindrical outer wall 250 with grooves 252 formed therein acts to receive a correspondingly shaped male portion of another syringe barrel, which is received within cylindrically extending cavity 254.
• the male portion includes threads configured to engage within grooves 252.
• a male portion of a coupling mechanism may alternatively be disposed at the distal end of syringe barrel 200 which includes the integrally formed rupturable membrane and sealing plug, with the female portion being disposed on the other syringe.
• Other coupling means and mechanisms will be apparent to one skilled in the art.
• syringe barrel 200 Similar to hollow inner plunger 100, syringe barrel 200 also includes a rupturable membrane 216, a sealing plug 214, an outwardly extending annular ridge 218, and annular groove 220. Rupturable membrane 216 caps and seals off the distal end of syringe barrel 200 so as to contain a first component within chamber 208, keeping it separate from a second component until the user desires to effect mixing.
• Sealing plug 214 is disposed on the outside of body wall 202, and although it does not slide or provide a seal against the inside of a syringe barrel (as in a syringe-in-syringe mixing system), its presence may help to seal and prevent any leaking that may otherwise occur between the two syringes when they are coupled together.
• such a sealing plug formed of an elastomeric material may improve the tightness, grip, and coupling strength of syringe barrel 200 to another syringe barrel, as the male portion of the other syringe barrel contacts sealing plug 214 (i.e., plug 214 may increase coupling friction by contacting or gripping the male portion of the coupled syringe barrel).
• an integral sealing plug and rupturable membrane specifically the arrangement of annular ridge 218 and annular groove 220, provides means for attaching rupturable membrane 216 to syringe barrel 200 without the need for glue or any other adhesive, which is helpful in preventing contamination as described above.
• first plunger 226 When it is desired to effect mixing of the two-part composition, the user presses first plunger 226 into syringe barrel 200 so as to compress first component 1 10a. Although it may be possible to first press opposite plunger 226a, this is less preferred as it may reduce the jetting mixing action of one component into the other.
• First plunger 226 may include a mark label thereon indicating that it be pressed first (not shown). Once a sufficient force is applied, rupturable membrane 216 breaks, causing first component 110a to be expressed under pressure from syringe barrel 200 into syringe barrel 228 where it mixes with second component 110b.
• the force of such rupture and jetting of the first component HOa into the second component HOb is often sufficient to effect homogeneous mixing, such that no additional mixing is required, although the illustrated syringe-to-syringe mixing system 224 easily allows a user to alternatingly press plungers 226 and 226a so as to further mix the two components together.
• Such a syringe-to-syringe mixing system may be particularly preferred where one or both components are of particularly high viscosity, such that additional mixing may be needed.
• Figure 4A illustrates an exemplary syringe-in-syringe mixing system 124.
• the user may press first plunger 126 into hollow inner plunger 100 so as to compress first component HOa.
• rupturable membrane 116 breaks causing first component HOa to be expressed under pressure from hollow inner plunger 100 into syringe barrel 128 where it mixes with second component 110b.
• the force of such rupture and jetting of the first component HOa into the second component 110b is sufficient to effect homogeneous mixing, such that no additional mixing (e.g., by shaking) is required, particularly where both components are low viscosity liquids.
• first and second components HOa and 11 Ob may each be a liquid, or one may be a solid powder, as dictated by the characteristics of the two-part composition to be mixed.
• the syringe-in-syringe mixer is particularly well suited for mixing together two relatively low viscosity liquids (e.g., less than about 100 centipoise, more preferably less than about 10 centipoise, and most preferably less than about 3 centipoise), because of the ability of the system to cause one component to be forcefully ejected into the other component so as to effect mixing without any additional effort (e.g., shaking is not necessary).
• One contemplated relatively low viscosity liquid-liquid two-part composition is a two-part self etching dental primer composition described in U.S. Patent Application Serial No. 11/261,171, filed October 28, 2005, and entitled SELF-ETCHING DENTAL PRIMER COMPOSITIONS AND METHODS AND SYSTEMS UTILIZING SUCH COMPOSITIONS.
• the system may also be used with higher viscosity liquids (e.g., up to about 1000 centipoise or even up to about 3500 centipoise) or a liquid-solid powder two-part composition, although when used for mixing such two-part compositions further mixing beyond that provided by the rupture of the membrane and turbulent jetting of one component into the other may be necessary.
• higher viscosity liquids e.g., up to about 1000 centipoise or even up to about 3500 centipoise
• a liquid-solid powder two-part composition e.g., up to about 1000 centipoise or even up to about 3500 centipoise
• it may be helpful when mixing such a composition to remove cap 130 and couple the system to another syringe so as to allow syringe-to-syringe mixing of the composition.
• the rupturable membrane 116 is configured to only pass first component HOa for mixing with second component HOb under a pressure sufficiently high to cause jetting of the first component into the second component (e.g., so as to create turbulence sufficient to mix the two components together).
• Cap 130 may include a check- valve or other vent (not shown) that permits air or other gas within barrel 128 to be expelled as first component 110a is expressed into barrel 128. Any check-valve known in the art can be used or modified to attach to barrel 128.
• the system may advantageously be configured such that a force required to rupture membrane 116 is approximately equal to a force required to insert and lock locking mechanism 136 (i.e., enlarged diameter portion 138 and interlocking ribs 140) of the cylindrical elongate stem 132 into hollow inner plunger 100, although it is not required.
• locking mechanism 136 i.e., enlarged diameter portion 138 and interlocking ribs 140
• Such a configuration provides a smooth and continuous movement and feel during use of the system as first plunger 126 is pressed into hollow inner plunger 100, rupturing membrane 116 and locking first plunger 126 into hollow inner plunger 100, all within a single movement.
• Figure 4B illustrates the system once first plunger 126 has been fully inserted into hollow inner plunger 100. In this configuration, first plunger 126 is locked into hollow inner plunger 100.
• FIG. 4C illustrates the system 124 with a dispensing tip 142 coupled at a distal end of barrel 128 so as to allow the user to dispense the mixed two-part composition 110.
• composition 110 maybe dispensed onto a pad for subsequent application ⁇ e.g., with a brush tool).
• composition 110 may be dispensed directly onto a tooth or other surface, depending on the preference of the user.

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• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Veterinary Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
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• General Health & Medical Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Dentistry (AREA)
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• Heart & Thoracic Surgery (AREA)
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• Anesthesiology (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
• Medical Preparation Storing Or Oral Administration Devices (AREA)

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• 2007
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• 2010
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• 2013
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