Dual medicament carpule for dental syringes
First Claim
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1. A dental carpule comprising:
- a tubular carpule body having a cylindrical bore along a length thereof, the carpule having a neck formed on a distal end thereof and a hole formed through the neck which is smaller in diameter than the bore and which connects the bore to a distal face of the carpule body;
a septum fixedly attached to the distal face of the carpule body to close the distal end of the carpule body;
a plunger disposed in a proximal end of the bore such that the plunger seals against the bore to close the proximal end of the bore;
a piston disposed in the bore between the septum and the plunger such that the piston divides the bore into a first anesthetic chamber and a second anesthetic chamber, wherein the piston comprises a generally cylindrical piston body having a hole therethrough, the hole being disposed in alignment with the bore of the carpule body and a membrane which is thin compared to a cylindrical wall of the piston body and which is attached to a distal face of the piston body to close the hole through the piston body;
wherein the piston comprises a proximal body portion which is cylindrical and which seals against the carpule body bore and a generally cylindrical distal body portion extending distally from the proximal body portion which is smaller in diameter than the proximal body portion and which is smaller in diameter than the hole through the carpule body neck;
a first anesthetic without a vasoconstrictor disposed in the first anesthetic chamber; and
a second anesthetic with a vasoconstrictor disposed in the second anesthetic chamber.
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Abstract
A carpule for a dental syringe provides an internal piston disposed between a front septum and a rear plunger. The internal piston is hollow and includes a thin membrane front. The internal piston is designed to offer minimum resistance to movement in the carpule body to allow for aspiration and for easy dispensing. The internal piston divides the carpule into two anesthetic chambers, allowing an anesthetic without a vasoconstrictor and an anesthetic with a vasoconstrictor to be dispensed sequentially in a single injection and without causing undue trauma to the patient.
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Citations
17 Claims
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1. A dental carpule comprising:
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a tubular carpule body having a cylindrical bore along a length thereof, the carpule having a neck formed on a distal end thereof and a hole formed through the neck which is smaller in diameter than the bore and which connects the bore to a distal face of the carpule body; a septum fixedly attached to the distal face of the carpule body to close the distal end of the carpule body; a plunger disposed in a proximal end of the bore such that the plunger seals against the bore to close the proximal end of the bore; a piston disposed in the bore between the septum and the plunger such that the piston divides the bore into a first anesthetic chamber and a second anesthetic chamber, wherein the piston comprises a generally cylindrical piston body having a hole therethrough, the hole being disposed in alignment with the bore of the carpule body and a membrane which is thin compared to a cylindrical wall of the piston body and which is attached to a distal face of the piston body to close the hole through the piston body; wherein the piston comprises a proximal body portion which is cylindrical and which seals against the carpule body bore and a generally cylindrical distal body portion extending distally from the proximal body portion which is smaller in diameter than the proximal body portion and which is smaller in diameter than the hole through the carpule body neck; a first anesthetic without a vasoconstrictor disposed in the first anesthetic chamber; and a second anesthetic with a vasoconstrictor disposed in the second anesthetic chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10)
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8. A dental system comprising:
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a dental carpule comprising; a tubular carpule body having a cylindrical bore along a length thereof, the carpule having a neck formed on a distal end thereof and a hole formed through the neck which is smaller in diameter than the bore and which connects the bore to a distal face of the carpule body; a septum fixedly attached to the distal face of the carpule body to close the distal end of the carpule body; a plunger disposed in a proximal end of the bore such that the plunger seals against the bore to close the proximal end of the bore; a piston disposed in the bore between the septum and the plunger such that the piston divides the bore into a first anesthetic chamber and a second anesthetic chamber, wherein the piston comprises a generally cylindrical piston body having a hole therethrough, the hole being disposed in alignment with the bore of the carpule body and a membrane which is thin compared to a cylindrical wall of the piston body and which is attached to a distal face of the piston body to close the hole through the piston body; a first anesthetic without a vasoconstrictor disposed in the first anesthetic chamber; and a second anesthetic with a vasoconstrictor disposed in the second anesthetic chamber; wherein the carpule is inserted into a syringe for use, and wherein an injection needle is attached to the syringe such that a cartridge end of the needle pierces the septum, and wherein the cartridge end of the needle does not extend proximally in the carpule body beyond the neck; and wherein the membrane is smaller than the hole through the carpule neck and wherein, during use, the piston is displaced distally while dispensing the first anesthetic until the membrane passes into the carpule neck and the membrane is pierced by the cartridge end of the needle. - View Dependent Claims (9)
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11. A carpule comprising:
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a tubular carpule body having a cylindrical bore disposed along a length thereof; a septum fixedly attached to a distal end of the carpule body to seal the distal end of the carpule body; a plunger disposed in a proximal end of the bore such that the plunger seals against the bore to close the proximal end of the bore; a generally rigid piston disposed in the bore between the septum and the plunger such that the piston divides the bore into a first medicine chamber and a second medicine chamber; wherein the piston comprises a generally cylindrical piston body having a hole therethrough, the hole being disposed in alignment with the bore of the carpule body, and a membrane attached to a distal face of the piston body to close the hole through the piston body, the hole extending through the piston body to expose a proximal face of the membrane; wherein the piston more specifically comprises a generally cylindrical proximal piston body, a shoulder disposed at the distal end of the proximal piston body, and a generally cylindrical distal body section which has a diameter which is smaller than a diameter of the proximal piston body and which protrudes distally from the shoulder, and wherein the distal body section is nestable within a reduced diameter carpule body neck which extends distally from the bore, and wherein the membrane is attached to a distal face of the distal body section; a first medicine disposed in the first medicine chamber; and a second medicine different than the first medicine disposed in the second medicine chamber. - View Dependent Claims (12, 13)
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14. A carpule comprising:
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a carpule body having a bore along a length thereof; a pierceable seal attached to a distal end of the carpule body to close a distal end of the bore; a plunger disposed in a proximal end of the bore to close the proximal end of the bore, the plunger being slidable within the bore; a piston disposed in the bore between the seal and the plunger, the piston sealing against the bore to divide the bore into a first medicine chamber and a second medicine chamber; wherein the piston comprises a cylindrical body, a membrane disposed on a distal end of the cylindrical body, and an opening in a proximal end of the cylindrical body, the opening extending distally to the membrane such that the membrane is exposed to the proximal end of the piston; wherein the distal end of the carpule body has a neck having a reduced diameter hole therethrough and wherein a distal portion of the piston body is generally cylindrical and has a reduced diameter which permits the distal portion of the piston body and the membrane to extend into the carpule body neck; wherein the piston has a range of distal movement which terminates adjacent a distal end of the bore, and wherein the bore is smooth throughout said range of distal movement; a first liquid medicine disposed in the first medicine chamber; and a second liquid medicine different from the first medicine disposed in the second medicine chamber. - View Dependent Claims (15, 16, 17)
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Specification