Dispensing syringe having multiple barrels for discharging a dental composition
First Claim
1. A dispensing syringe for dispensing a two-component composition, comprising:
- a) a syringe body including, i) a first elongated barrel having a proximate opening for receiving a first plunger rod and a first exit port for discharging a first component of the composition;
ii) a second elongated barrel having a proximate opening for receiving a second plunger rod and a second exit port for discharging a second component of the composition, the first and second barrels being arranged in parallel along the length of the syringe body;
b) a plunger rod assembly including, i) a rearward stop plate, ii) a first plunger rod having an outer threaded edge and an inner non-threaded edge, the first plunger rod having a forward-facing end portion for forcing the first component of the composition into the first exit port, and an opposing rear-facing end portion attached to the stop plate, iii) a second plunger rod having an outer threaded edge and an inner non-threaded edge, the second plunger rod having a forward-facing end portion for forcing the second component of the composition into the second exit port, and an opposing rear-facing end portion attached to the stop plate, wherein the first and second plunger rods are arranged in parallel for joint movement within the first and second barrels respectively; and
c) a rotatable, threaded knob for connecting the plunger rod assembly to the syringe body, the threaded knob having a through-bore with a continuous internal thread for engaging the outer threaded edges of the first and second plunger rods so that as the knob is rotated, the plunger rods move together in a forward or rearward direction within the barrels.
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Accused Products
Abstract
A dispensing syringe for dispensing a multi-component dental composition, preferably a two component composition, is provided. The syringe includes a syringe body with multiple elongated barrels for storing the components of the composition; a threaded plunger rod assembly; and a rotatable, threaded connector knob. Preferably, the syringe body has a double-barrel structure and the plunger rod assembly includes two plunger rods that slide within the barrels. The threaded knob has a through-bore with a continuous internal thread for engaging the outer threads of the first and second plunger rods. A dental practitioner manually rotates the knob to displace the first and second plunger rods and discharge the components. The dispensing syringe may further include a dispensing tip containing a static mixing element for mixing the components and dispensing the mixed composition.
85 Citations
22 Claims
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1. A dispensing syringe for dispensing a two-component composition, comprising:
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a) a syringe body including, i) a first elongated barrel having a proximate opening for receiving a first plunger rod and a first exit port for discharging a first component of the composition;
ii) a second elongated barrel having a proximate opening for receiving a second plunger rod and a second exit port for discharging a second component of the composition, the first and second barrels being arranged in parallel along the length of the syringe body;
b) a plunger rod assembly including, i) a rearward stop plate, ii) a first plunger rod having an outer threaded edge and an inner non-threaded edge, the first plunger rod having a forward-facing end portion for forcing the first component of the composition into the first exit port, and an opposing rear-facing end portion attached to the stop plate, iii) a second plunger rod having an outer threaded edge and an inner non-threaded edge, the second plunger rod having a forward-facing end portion for forcing the second component of the composition into the second exit port, and an opposing rear-facing end portion attached to the stop plate, wherein the first and second plunger rods are arranged in parallel for joint movement within the first and second barrels respectively; and
c) a rotatable, threaded knob for connecting the plunger rod assembly to the syringe body, the threaded knob having a through-bore with a continuous internal thread for engaging the outer threaded edges of the first and second plunger rods so that as the knob is rotated, the plunger rods move together in a forward or rearward direction within the barrels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A dispensing syringe for dispensing a two-component composition, comprising:
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a) a syringe body including, i) a first elongated barrel having a proximate opening for receiving a first plunger rod and a first exit port for discharging a first component of the composition into a dispensing tip;
ii) a second elongated barrel having a proximate opening for receiving a second plunger rod and a second exit port for discharging a second component of the composition into the dispensing tip, the first and second barrels being arranged in parallel along the length of the syringe body;
b) a plunger rod assembly including, i) a rearward stop plate, ii) a first plunger rod having an outer threaded edge and an inner non-threaded edge, the first plunger rod having a forward-facing end portion for forcing the first component of the composition into the dispensing tip, and an opposing rear-facing end portion attached to the stop plate, iii) a second plunger rod having an outer threaded edge and an inner non-threaded edge, the second plunger rod having a forward-facing end portion for forcing the second component of the composition into the dispensing tip, and an opposing rear-facing end portion attached to the stop plate, wherein the first and second plunger rods are arranged in parallel for joint movement within the first and second barrels respectively; and
c) a rotatable, threaded knob for connecting the plunger rod assembly to the syringe body, the threaded knob having a through-bore with a continuous internal thread for engaging the outer threaded edges of the first and second plunger rods so that as the knob is rotated, the plunger rods move together in a forward or rearward direction within the barrels. d) a dispensing tip for receiving the first and second components of the composition from the first and second barrels and dispensing the composition to a desired area. - View Dependent Claims (15, 16, 17, 18)
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19. A dispensing syringe for dispensing a multi-component composition, comprising:
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a) a syringe body including multiple elongated barrels, each barrel having a proximate opening for receiving a plunger rod and an exit port for discharging a single component of the composition;
b) a plunger rod assembly including, i) a rearward stop plate, ii) multiple plunger rods, each plunger rod having an outer threaded edge and an inner non-threaded edge, and each plunger rod further having a forward-facing end portion for forcing a single component of the composition into an exit port, and an opposing rear-facing end portion attached to the stop plate, wherein the plunger rods are arranged for joint movement within the barrels; and
c) a rotatable, threaded knob for connecting the plunger rod assembly to the syringe body, the threaded knob having a through-bore with a continuous internal thread for engaging the outer threaded edges of the multiple plunger rods so that as the knob is rotated, the plunger rods move together in a forward or rearward direction within the barrels. - View Dependent Claims (20, 21, 22)
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Specification