RU2245168C1 - Dental ampule injector - Google Patents

Abstract

FIELD: medicine, in particular, stomatology, applicable for local injection dental anesthesia.

SUBSTANCE: the dental ampule injector has a cylindrical casing with an anesthetic solution, with a needle sealed in its front end face. From behind the casing is closed with an elastic piston cup with a cylindrical duct in the centre terminating in a cavity having the shape of a truncated cone. The piston cup is hinge-joined to a replaceable handle beginning with a pusher in the form of a cylinder with a spherically thickened tip. The length and the diameter of the cylindrical section of the replaceable handle corresponds to the length and the diameter of the duct with a truncated cone-shaped cavity of the piston cup. The replaceable handle terminates in a stop for the fingers, it has 4 guide blades forming a flat stage resting upon the piston cup. For infiltration injections the capacity of the ampule injector makes up 1.2 ml, the needle caliber is 0.3 mm, its length is 21 mm, and for conductive injections the capacity make up 2.5 ml, needle caliber is 0.4 mm, its length is 32 mm.

EFFECT: produced compact, simple in assembly and safe in terms of infection injector.

1 dwg

Description

The invention relates to dentistry, dentistry. Anesthesia is an important part of any dental specialty. In dental anesthesia, a cartridge syringe is the main tool.

More than 1 billion cartridges are consumed worldwide every day. It was proposed in 1918 by the American surgeon H.S. Cook.

The authors consider the metal holder of a replaceable, standard cylindrical ampoule (1.8 ml cartridge) with an anesthetic solution, a handle-pusher-piston-tube ampoule, a ledge on the front end of the case to strengthen the injection needle, stops for fingers and palms as an analogue. (S. A. Rabinovich, 2000. - pp. 39-48, chap. Syringes) As a prototype, the authors propose a dental cartridge syringe from Cook-Waite Laboratories, which, while retaining all of the above elements, has a pusher handle with a harpoon tip connecting to the plug piston through a channel obtained by piercing it. The syringe is used with a set of needles of different lengths and diameters. The syringe is adapted to one standard cartridge - 1.8 ml. (N.B. Jorgensen, J. Hayden, 1980. - pp. 59-62, ch. Equipment and materials).

Common disadvantages of syringe holders.

1. Any cartridge syringe is too long, which does not allow it to hold the grip with a pen when bringing the needle to the target of injection. This length is determined by the size of the cartridge: at least d = 8 mm, l = 64 mm.

2. The injection system consists of at least 3 parts: a needle, a cartridge, a cartridge holder, which increases the size of the system and requires time to assemble it, which often passes before the eyes of the patient.

3. This is an expensive device.

4. The metal case of the cartridge syringe holder has remained almost unchanged over the course of a century: it remains a reusable device. For proper use (sterilization), there should be several (4-6-10) syringe holders in the doctor’s workflow. Dentists have single samples and therefore sterilization is replaced by disinfection. This is a violation of asepsis.

5. Cartridges of the syringe holder have a pronounced self-aspiration effect. And since almost a third of domestic dentists use the same cartridge in different patients, it creates the possibility of cross-infection with viral hepatitis, AIDS, purulent infections, etc.

6. The cartridge membrane is sterilized before filling into the syringe and therefore is further treated with alcohol.

7. It is not possible to aspirate the liquid with the cartridge holder-syringe by pulling the cartridge plug-piston by the push handle.

8. The cartridge syringe should have a set of screw-on needles of different calibers in thickness, length and two types of thread: American and European.

The disadvantages of the prototype include all of the above disadvantages of the analogue.

a. In addition, for regular aspiration, the prototype syringe holder is complicated by special devices, in this case a harpoon gripper for the plug piston.

b. The volume of injected anesthetic solution is dictated by the size of the cylindrical ampoule (1.8 ml). In particular, if you need to enter 2.5-3 ml, you need to do 2 injections to the patient.

The authors propose a disposable sterile dental syringe ampoule (see drawing), consisting of a cylindrical body (1) with an anesthetic solution (2), with a needle (3) soldered into its protrusion at the front end, closed by a sealed elastic case (4). The rear part of the cylindrical body with the sides-stops for fingers (5) is closed by an elastic piston-plug (6) with a diameter of 9-11 mm, a length of 8-12 mm with a cylindrical channel in the center (7) with a diameter of 3.5 mm, a depth of 6-10 mm, ending in a cavity in the form of a truncated cone (8) with a base diameter of 6 mm, an angle of 45 ° and a diameter of a truncated peak corresponding to the diameter of the piston-tube channel. The plug piston (5) is pivotally connected to a replaceable handle 70 mm long (9), starting with a cylinder-shaped pusher (10) with a spherically thickened tip (11). The length and diameter of the cylindrical part of the interchangeable handle corresponds to the length and diameter of the channel with a truncated-conical cavity of the piston-plug. The replaceable handle ends with a finger rest (12) and contains 4 guide vanes (13), cut at an angle of 45 ° and forming a flat platform with a diameter of 6 mm (14), abutting against the piston plug. For infiltration injections, the diameter of the syringe ampoule is 9-12 mm, the capacity is 1.0-1.8 ml, the needle gauge is 0.4-0.25 mm, its length is 8-21 mm, and for conductive injections the diameter of the ampoule is 9-12 mm, capacity 2-3 ml, needle gauge 0.4-0.5 mm, its length 30-35 mm.

Advantages

1. More compact as the case replaces the cartridge.

2. The small length and compactness of the injection system makes it possible to move from the grip with a pen without shifting when the needle is brought to the target to pressure on the piston.

3. It is safer in terms of infection, since sterilization or disinfection of the injection part in the doctor’s office is excluded.

4. Assembling a syringe ampoule is simple and can be entrusted to maintenance personnel.

5. The syringe ampoule provides for the possibility of aspiration without gross displacements, including the possibility of aspirating a large amount of liquid.

6. There is no problem selecting a needle depending on the type of screw thread on its cannula.

7. There is no problem selecting a needle depending on the method of anesthesia: infiltration or conductor.

8. The process of piercing a piston with a syringe plug by a harpoon is excluded.

Claims (1)

Dental syringe ampoule, including a cylindrical ampoule with an anesthetic solution, a pusher handle with a gripping tip in the form of a harpoon connected to the piston-plug through the channel, and a set of needles, characterized in that the dental syringe ampoule is a disposable sterile cylindrical dental syringe an ampoule consisting of a cylindrical body with an anesthetic solution, with a needle soldered into its protrusion on the front end, closed with a sealed elastic case, with finger stops at the rear end of the case, closed by an elastic plug piston with a diameter of 9-11 mm, a length of 8-12 mm with a cylindrical channel in the center with a diameter of 3.5 mm, a depth of 6-10 mm, ending with a cavity in the form of a truncated cone with a base diameter of 6 mm, with an angle of 45 ° and a diameter of its truncated apex corresponding to the diameter of the piston-plug channel pivotally connected to a replaceable handle 70 mm long, starting with a cylinder-shaped pusher with a spherically thickened tip, the length and diameter of the cylindrical part of which correspond to the length and diameter of the truncated cone-shaped channel the hollow of the piston-plug, ending with an emphasis for the fingers and containing 4 guide vanes cut at an angle of 45 ° and forming a flat platform with a diameter of 6 mm, abutting against the piston-plug, and for infiltration injections, the diameter of the syringe-ampoule is 9-12 mm, capacity 1, 0-1.8 ml, needle gauge 0.4-0.25 mm, its length 8-21 mm, and for conductor injections, the diameter of the ampoule is 9-12 mm, the capacity is 2-3 ml, the needle gauge 0.4-0, 5 mm, its length is 30-35 mm.