US 5,860,739 A · Automatic mixing syringe for dental materials

Abstract

A dental syringe system including a gun element, for association with a tip element, to mix and dispense respective dental materials of and while the materials yet have plastic or flowable consistency. The gun has a chamber in which to load cartridges of respective such materials, a motor, two plungers, a ram to move relative to the gun, and a trigger-and-gears mechanism to operate the plungers in association with the motor, and separately to operate the ram. The trigger is mounted to move to and between several positions. At one such position, the trigger operates the motor to advance the plungers into respective sites where such cartridges may be loaded and, when cartridges are so loaded, to express materials from the cartridges and the gun. At a subsequent such position, the trigger extends the ram from the gun, and the motor and the plungers disengage. The tip element has a trans-tip passage with a cavity, vanes within the cavity, and a channel from the cavity. When the gun is so loaded and carries the tip element so that the chamber is in communication with the cavity, the trigger is operable in two respects: first, to advance the plungers and to express material from each cartridge into the cavity, and, second, to extend the ram into the cavity, to mix the materials on the vanes, and to urge mixed materials from the tip element via the channel. Two trigger-and-gear mechanisms for the gun are disclosed.

Claims14

Dependent claims

A syringe member for association with a tip to be carried on the syringe member, the tip having an interior passage with a cavity and a channel from the cavity, for dispensing dental materials, and comprising

a gun providing a chamber, an orifice and sites in the chamber for loading a respective cartridge of dental material at each site;
and, adapted to carry such tip with the chamber in communication with the cavity via the orifice;
a motor on the gun;
a shaft carried within the gun, comprising a ram, and arranged for movement as to the gun, to be driven by the motor, and to disengage from the motor;
first and second plungers on the gun, and arranged to advance into respective ones of the sites when the motor drives the shaft;
and,
a trigger on the gun;
linked with the shaft;
arranged to be moved to and between each of first, second and third positions;
and, adapted at the second position to connect the motor with a power source and so to operate the motor to drive the shaft, and, at the third position, to disengage the shaft from the motor;
so, when the gun is loaded with a cartridge of dental material at each site and carries such tip with the chamber in communication with the cavity via the orifice, the trigger at the second position serves to advance each one of the plungers into a respective one of the cartridges and to express materials from the cartridges, via the orifice, into the passage;
and, movement of the trigger to the third position serves to disengage the shaft from the motor and to extend the ram, via the orifice, into the cavity to urge expressed materials from the tip via the channel.

9 more elements

A syringe, for dispensing dental materials in mixed status comprising

a gun having a chamber, an orifice, and sites in the chamber for loading cartridges of respective dental materials;
an electric motor on the gun;
a shaft carried within the gun, defining a ram, and arranged to move as to the gun, and to be driven by and to disengage from the motor;
first and second plungers on the gun whereof each is implemented to advance into a respective one of the sites when the shaft is driven by the motor;
a trigger on the gun and arranged to be moved to and between each of first, second and third positions;
linked to the shaft;
adapted, at second position, to connect the motor with a power source and so to operate the motor to drive the shaft, and, at third position, to disengage the shaft from the motor;
and,
a tip with wall portions defining an interior trans-tip passage including a cavity and a channel from the cavity, with spatular vanes in the cavity and to be mounted on the gun with the cavity in communication with the chamber via the orifice, and whereof the vanes are adapted to displace toward wall portions defining the cavity under applied deflective force;
so when the gun is loaded with a cartridge of dental material at each site, and the tip is mounted on the gun, the trigger at second position drives the shaft to advance each one of the plungers into a respective one of the cartridges and to express dental materials from the cartridges, via the orifice, into the cavity and to mix expressed materials on the vanes;
and, subsequent movement of the trigger to third position extends the ram, via the orifice and into the cavity and mixed materials there to apply deflective force to the vanes and to urge mixed materials from the tip via the channel.

8 more elements

Dependencies are inferred from the claim text.

Automatic mixing syringe for dental materials

Life of this patent

Automatic mixing syringe for dental materials

Life of this patent

Abstract

Claims14