Mixing and dispensing syringe

• US 4,776,704 A
• Filed: 12/15/1986
• Issued: 10/11/1988
• Est. Priority Date: 12/15/1986
• Status: Expired due to Fees

• Current Assignee: DENTSPLY International Incorporated (Astrazeneca PLC)
• Original Assignee: DENTSPLY International Incorporated (Astrazeneca PLC)
• Inventors: Welsh, Richard E., Hammesfahr, Paul D., Kopunek, Thomas V.
• Primary Examiner(s): JENKINS, ROBERT
• Application Number:
  US06/941,471
• Time in Patent Office: 666 Days
• Field of Search: 366/184, 366/189, 366/190, 366/336, 366/338, 366/339, 366/340, 366/267, 366/332, 366/333, 366/334, 366/335, 222/190, 222/145, 222/386, 604/56, 604/82, 604/89, 604/92, 604/416
• US Class Current: 366/184
• CPC Class Codes: A61C 5/62 Applicators, e.g. syringes or guns
• CPC Class Codes: A61C 5/64 for multi-component compositions
• CPC Class Codes: B01F 25/43141 composed of consecutive sections of helical formed elements
• CPC Class Codes: B01F 31/441 performing a rectilinear reciprocating movement
• CPC Class Codes: B01F 33/5011 portable during use, e.g. hand-held
• CPC Class Codes: B01F 33/50112 of the syringe or cartridge type
• CPC Class Codes: B01F 35/3202 Hand driven
• CPC Class Codes: B05C 17/00516 Shape or geometry of the outlet orifice or the outlet element

Abstract

A mixing and dispensing syringe having a single mixing cylinder loadable at one end with a plurality of different materials to be blended and mixed by static devices, a dispensing nozzel on the opposite end of said cylinder, a piston-like unit axially movable in the cylinder between opposite ends thereof by means of a manually-operable member connected to one end of the unit, whereby, when the unit is positioned nearest the nozzle in the cylinder and the cylinder is loaded with the materials to be mixed, movement of the unit toward the loadable end of the cylinder causes the materials to pass through a mixing device in the unit and into a common chamber or barrel of the syringe to effect partial mixing and when the unit next is moved toward the nozzle by the manual member, the partially mixed materials then pass through the static mixing device in the nozzle and are further mixed incident to being discharged from the syringe.

Claims

1. A mixing and dispensing syringe for viscous material comprising in combination, a single mixing cylinder having a discharge nozzle on one end and a filling entrance on the opposite end, closure means operable upon said opposite end to enclose a plurality of materials when loaded into said cylinder, a piston-like unit complementary in size with the diameter of said cylinder and movable longitudinally therein between opposite ends of said cylinder and initially positioned adjacent said nozzle, a first static mixing device in said piston-like unit and a second static mixing device in said nozzle, and an elongated manual-operating member connected at one end to said piston-like unit and extending longitudinally and slidably through said closure and adapted to be pulled outwardly relative to said closure to cause the plurality of materials to be passed through said first static mixing device to be mixed as said piston-like unit is pulled toward said closure means and, upon reversely pushing said piston-like member toward said nozzle, the partially mixed materials will be expressed through the second static mixing device in said nozzle, thereby to complete the mixing of said materials as being discharged from said cylinder, wherein each static mixing device comprises a plurality of axially-aligned members and the mixing device in said nozzle having a greater number of said members than the number in said piston-like unit, whereby a greater amount of mixing of the materials occurs in the nozzle than in the piston-like unit prior to discharge from the syringe.

2. The syringe according to claim 1, further characterized by said elongated manual-operating member comprising a flat blade-like member extending between opposite walls of said cylinder and slidably engaging the same to form a pair of material-receiving compartments when said piston-lke unit is positioned in spaced relation to the filling end of said cylinder.

3. The syringe according to claim 1, further including a one-way valve on the end of the first static mixing device in said piston-like unit nearest the nozzle, whereby, when the materials have been partially mixed by movement of the piston-like unit toward the filling end of the cylinder while the materials pass through and are mixed by dispensing into a common chamber of said syringe by passing through said first static mixing device and the piston-like unit is moved toward said optional nozzle, said valve is closed by engaging the partially mixed materials and remains closed while said partially mixed materials are passing through the static mixing device in said nozzle.

4. The syringe according to claim 1, further including an enclosing cover for said nozzle to maintain the same uncontaminated and said components of the entire syringe being composed of relatively rigid plastic material to render the same inexpensive to manufacture and permit disposal of the same and any material therein to prevent re-use.

5. The syringe according to claim 1, further characterized by piston-like unit being composed of two parts connected for limited longitudinal movement, one of said members being connected to the inner end of said operating member and the other part of said piston-like member having a sleeve-like male portion slidably received in a bore in said one of said parts, said sleeve-like male portion having a bore longitudinally therethrough which contains said first static mixing device for passage of the materials therethrough to be mixed, said connection of said one part to said operating member having a passage therethrough for movement of material to one end of said first static mixing device when said piston-like member is being moved toward said filling end of said cylinder and said other part of said piston-like member being movable to close passage to said first static mixing device when said member is moved toward the nozzle on said cylinder.

6. The syringe according to claim 5, in which movement between the parts of said piston-like member is controlled by slots of limited length being formed in one of said members and screw-like members being fixed to said other member and having portions slidable in said slots, whereby limited movement is restricted to the length of said slots.

7. A mixing reservoir comprising in combination, a reservoir member to enclose a plurality of materials, a piston-like unit comprising a mixing device means complementary with said reservoir member and reciprocally movable therein between two positions, said mixing means being a static mixing device and an outlet in said reservoir member, said mixing reservoir comprising a manual-operating member connected to said piston-like unit and extending through said mixing reservoir and dividing said mixing reservoir into at least two material-containing compartments when said piston-like unit is positioned adjacent said outlet and adapted to be moved away from said outlet on the first said stroke to cause the plurality of materials to be passed through said mixing device to be mixed, and, upon reversely moving on the second said stroke moving said piston-like member toward said outlet to express said mixed materials therefrom, wherein said mixing device means comprises a valve means adapted to be opened to pass said plurality of materials through said mixing device of said piston-like unit on a first stroke of reciprocal movement to effect at least partial mixing of said plurality of materials and closed on another stroke of said reciprocal movement when expressing said mixed materials from said outlet, wherein said reservoir is tubular with the wall surface defining said tube being substantially aligned with the path of reciprocal movement of said piston-like unit, said outlet being at one end of said tubular reservoir, said piston-like unit being complementary with the inside cross section of said tubular reservoir and movable therein between opposite ends of said tubular reservoir and initially positioned adjacent said outlet, and said piston-like unit being adapted to be moved to cause said plurality of materials to be passed through said mixing device with a rolling and cutting action mixing the plurality of materials together as said piston-like unit is moved on at least one stroke of said reciprocal movement.

8. The mixing reservoir of claim 7, further characterized by said static mixing device only partially mixing said plurality of materials, and said oulet containing a second static mixer through which mixed material is passed to effect further mixing thereof.

9. The mixing reservoir of claim 8, wherein said first and said second static mixers each comprise a plurality of axially-aligned blade members that have reversing concave and convex surfaces, the static mixing device in said outlet having a greater number of said blade members than the number in said piston-like unit, whereby a greater amount of mixing of the materials occurs while passing through the outlet than while passing through the mixing device in said piston-like unit prior to discharge from the outlet.

10. The mixing reservoir of claim 8, further including a one-way valve on the end of the first static mixing device at the end of said piston-like unit farthest from said outlet and having a valve seat on said piston-like unit and a valve member on said manual-operating member, said valve member being lifted from said seat on operation of said manual-operating member on the first stroke during which the materials are partially mixed by movement of the piston-like unit away from said outlet to cause the materials to pass through and be partially mixed by the static mixing device and when the piston-like unit is moved toward said outlet, said valve member engages said seat to close said valve when the manually-operating unit is moved toward said outlet to push said piston-like unit against the partially mixed materials and said valve remains closed while said partially mixed materials are passing through said second static mixing device in said outlet.

11. A flow control valve for a mixing and dispensing syringe comprising a piston-like unit having two longitudinally movable members having a common axis, one of said members having a bore, a static mixing device in said bore adapted to have ingredients pass through said valve and then through said device to be mixed, the other member of said unit slidably receiving at least a portion of said one member and at one end being connected to one end of an operating member adapted to be moved toward and from said one member, and a valve member on said operating member at least coextensive in area and aligned with one end of said static mixing device and adapted to abut said one end of said device and close it against passage of material therethrough when moved toward said one member and when movement of said operating member is reversed said valve member is moved away from said end of said device and opens the adjacent end of said static mixing device for passage of material therethrough to be mixed.

12. The flow control valve according to claim 11 further including movement limiting means interconnected between said longetudinally movable members and comprising a groove or slot of predetermined length in one of said members and at least one projecting member fixed to the other member and slidable within said groove or slot.

13. A mixing syringe for a plurality of different flowable materials comprising in combination, a hollow-body having a discharge end, and a plurality of side by side compartments respectively to contain said different materials, a piston-like member movable longitudinally in said body and having at least one passage therethrough, at least one valve member adapted to close said passage in said piston-like member when the same is adjacent the discharge end of body and thereby prevent escape of material from said compartments until mixing thereof is desired, and an actuating member which is elongated and flat and extends between opposite side walls of said hollow body to form said compartments, and wherein said piston-like member comprises a pair of first and second longitudinally movable members having means to restrict the amount of relative movement therebetween, and said elongated actuating member being connected to the first member which is nearest the end of the actuating member on which the valve member is mounted and the second member of the piston-like member having said longitudinal passage therethrough and slidably extending through said first member, and in which said activating member opens said valve member opening said passage and mixing said different materials and then moving said piston-like member away from the discharge end of said body toward the other end thereof and thereby forcing the materials in said compartments to interengage and mix.

14. The mixing syringe according to claim 13 in which said second member has an elongated diametrically reduced portion on one end and said first member has a bore slidably receiving said reduced portion of said second member for the full length thereof, and movement-limiting means on said members comprising a slot in one member and a pin or screw on the other slidably received in said slot.