RU2780924C1 - Disposable syringe for a two-gradient dental material and tubular cannula of a disposable syringe - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: group of inventions relates to medicine and medical equipment and can be used for mixing and dispensing two-gradient dental materials. Disposable syringe for a two-gradient dental material comprises a tubular cannula connected with two cylindrical bodies by a mixing chamber. Pistons with rods are placed in the cavities of the cylindrical bodies. A thrust end finger jumper links the ends of the rods. The pistons are equipped with sealing rings made of an elastic material. Rings are located by the ends of the pistons oriented towards the mixing chamber. The pointed tubular elements placed in the mixing chamber are made to pierce the ends of the output channels of the cavities of the cylindrical bodies. The opposing ends of the pistons are made with conical guide depressions for orienting the tapering ends of the rods, equipped with annular stops for the interaction with the end walls of the cylindrical bodies by the rod insertion holes, the diameters whereof are smaller than the diameters of the annular stops by an amount at least exceeding the thickness of one end wall. Each cylindrical body by the end oriented towards the mixing chamber is made with an annular inner locking recess for a sealing ring, the diameter whereof is greater than the diameter of half the depth of the recess. The body cavities are filled with dental material gradients required for at least a single dose of the two-gradient dental material.

EFFECT: higher convenience of using a disposable syringe to manually dose two ingredients of a dental material supplied for mixing the resulting composition in the mouth immediately before use.

2 cl, 2 dwg

Description

SUBSTANCE: group of inventions relates to medicine and medical equipment and can be used for mixing and distributing two-gradient dental materials.

A syringe for a two-gradient dental material is known, containing a tubular cannula connected by a mixing chamber to a container with two cylindrical housings placed inside, in which pistons and rods are located, connected by a persistent end jumper for fingers (US 2003,0187387 A1, 02.10.2003).

The disadvantage of the known syringe is the complexity of its design, which includes a container that is a common housing for cylindrical housings and is equipped with a latch that ensures its connection with cylindrical housings.

A closer tax of the first invention (prototype) is a disposable syringe for a two-gradient dental material containing a tubular cannula connected by a mixing chamber with two cylindrical housings with pistons and rods placed in the cavities and connected by a persistent end jumper for fingers (US 6936033 B2, 08/30/2005) .

The disadvantage of the prototype is the implementation of the mechanism that prevents the reuse of the syringe, by completely disassembling it into separate components. However, the reuse of individual elements of a known design cannot exclude such a mechanism.

The group of inventions is aimed at solving a technical problem, which consists in creating a design that does not have the disadvantages of known devices.

The technical result of the group of inventions is to improve the convenience of manual dosing with a disposable syringe of two ingredients of dental material supplied for mixing immediately before using the resulting composition in the mouth.

The essence of the group of inventions is expressed in the totality of essential features, in which a disposable syringe for a two-gradient dental material, containing a tubular cannula connected by a mixing chamber with two cylindrical housings with pistons and rods placed in cavities, connected by a persistent end jumper for fingers, differs from the closest analogue in that that the pistons are provided with sealing rings made of elastic material, located at the ends of the pistons, oriented towards the mixing chamber, equipped with pointed tubular elements made to pierce the ends of the outlet channels of the cavities of the cylindrical housings, moreover, the opposite ends of the pistons are made with cone-shaped guide cavities to orient the tapering ends of the rods, equipped with annular stops for interaction with the end walls of the cylindrical housings at the holes made for the rods, the diameters of which are less than the diameters of the annular stops by an amount as at least exceeding the thickness of one end wall, while each cylindrical body at the end oriented to the mixing chamber is made with an annular internal locking recess for the sealing ring, the diameter of which is greater than the diameter of half the depth of the recess, and the cavity of each housing is filled with a gradient of dental material necessary for, at least one dose of bigradient dental material.

A tubular cannula for a disposable syringe contains a mixing chamber with pointed tubular elements designed to pierce the ends of the outlet channels of the cavities of the cylindrical bodies, moreover, the mixing chamber is threaded for connection with two cylindrical bodies of the syringe, and the pointed tubular elements are fixed on an insert installed in the mixing chamber with the possibility of rotation relative to the inner surface of the mixing chamber.

The essence of the group of inventions is illustrated by the drawing, where in Fig. 1 is a general view of a disposable syringe for a two-gradient dental material, and FIG. 2 - longitudinal section of a disposable syringe.

A disposable syringe for a two-gradient dental material contains a tubular cannula 1 connected by a mixing chamber 2 with two cylindrical bodies 3 and 4, in the cavities of which pistons 5 and 6 are placed, connected to the rods 7 and 8. A thrust end jumper 9 for fingers connects the ends of the rods 7 and 8. Pistons 5 and 6 are provided with O-rings 10 and 11 made of elastic material. Rings 10 and 11 are located at the ends of the pistons 5 and 6, oriented towards the mixing chamber 2. The pointed tubular elements 12 and 13 placed in the mixing chamber 2 are made to pierce the ends of the outlet channels of the cavities of the cylindrical bodies 3 and 4. The opposite ends of the pistons 5 and 6 are made with cone-shaped guide depressions 14 and 15 for orienting the tapering ends of the rods 7 and 8, equipped with annular stops 16 and 17 for interacting with the end walls 18 and 19 of the cylindrical bodies 3 and 4 at the holes 20 and 21 made for the rods 7 and 8, the diameters of which are smaller diameters of the annular stops 16 and 17 by a value at least greater than the thickness of one end wall 18 or 19. Each cylindrical body 3 or 4 at the end oriented to the mixing chamber 2 is made with an annular internal locking recess 22 or 23 under the sealing ring 10 or 11, the diameter of which is greater than the diameter of half the depth of the recess 22 or 23. The cavities of the housings 3 and 4 are partially filled enes with gradients of dental material designed for a single dose or the desired number of doses.

The tubular cannula 1 for a disposable syringe contains a mixing chamber 2 with pointed tubular elements 12 and 13, which are designed to pierce the ends of the outlet channels of the cavities of the cylindrical bodies 3 and 4. The mixing chamber 2 is threaded for connection with two cylindrical bodies 3 and 4. Pointed tubular elements 12 and 13 are fixed on the insert 24 installed in the mixing chamber 2 with the possibility of rotation relative to the inner surface of the mixing chamber 2.

A disposable syringe for a two-gradient dental material prepared for work and in a sterile package must contain the required volumes of gradients, which, during the manufacture of the syringe, partially fill bodies 3 and 4 with pistons 5 and 6 installed in them and rods 7 and 8. Tapered ends of rods 7 and 8 are placed in the cone-shaped guide depressions 14 and 15, necessary for orienting the tapering ends of the rods 7 and 8, which do not have a permanent connection with the pistons 5 and 6. The tubular cannula 1 in the position prepared for operation is connected to the cylindrical bodies 3 and 4, but the pointed tubular elements 12 and 13 located in the mixing chamber 2 do not touch the outlet channels of the cavities of the cylindrical bodies 3 and 4.

To apply a two-gradient dental material, the dentist removes the syringe from the package and rotates the tubular cannula 1 for several turns, screwing it onto housings 3 and 4. When rotating the tubular cannula and mixing chamber 2, which also rotates and moves towards housings 3 and 4, insert 24 , installed in the mixing chamber 2 with the possibility of rotation relative to its inner surface, maintains its position relative to the housings 3 and 4, and when the mixing chamber 2 and housings 3 and 4 approach each other, it pierces the ends of the outlet channels of the cavities of the cylindrical housings 3 and 4.

With the pressure of the fingers on the thrust end jumper 9 of the rods 7 and 8, the dentist moves the pistons 5 and 6 in the cylindrical housings 3 and 4, squeezing out the dental material gradients from each housing.

The movement of the pistons 5 and 6 occurs until their end surfaces stop against the ends of the cylindrical bodies 3 and 4. O-rings 10 and 11, made of elastic material in the final segment of the working stroke of the pistons 5 and 6, even before their end surfaces stop against the ends of the cylindrical bodies 3 and 4 fall into the annular internal locking recesses 22 or 23, made for sealing rings 10 and 11, the diameter of which is greater than the diameter of half the depths of the recesses 22 or 23.

The ratio of the diameters of the sealing rings 10 and 11 and the depths of the recesses 22 or 23, combined with the absence of a retaining connection between the cone-shaped guide cavities 14 and 15 and the tapered ends of the rods 7 and 8, excludes the reverse stroke of the pistons 5 and 6 and the reuse of the syringe. The removal of the rods 7 and 8 from the cylindrical bodies 3 and 4 is prevented by the annular stops 16 and 17, interacting with the end walls 18 and 19 of the cylindrical bodies 3 and 4 at the holes 20 and 21 made for the rods 7 and 8. Since the diameters of the holes 20 and 21 are smaller than the diameters annular stops 16 and 17 by an amount at least exceeding the thickness of one end wall 18 or 19. Extraction of rods 7 and 8 from the cavities of cylindrical bodies 3 and 4 leads to the destruction of their end walls 18 and 19.

Example

Patient A., 37 years old. Complaints: the presence of a carious cavity in the area of the 46th tooth, short-term pain from cold and sweet.

Objectively: there is a carious area of medium depth on the masticatory surface, probing is sensitive along the enamel-dentin border, thermometry in the cold, painful, transient, percussion is painless, the gingival mucosa is hyperemic.

Diagnosis: medium caries 46 tooth

Treatment:

Pain relief Sol.Ultracaini 1.7 ml. For high-quality treatment, it is necessary to ensure the absence of moisture, external liquid and saliva in the area of the working field for adhesion of the composite and photopolymer to the walls of the tooth, their adhesion. After anesthetizing the patient, the doctor proceeds to the manufacture of a protective barrier. To do this, a syringe is taken out of a sterile package, a two-gradient dental material is applied with a disposable syringe, namely a liquid silicone corrective impression mass and an activator. Then the fabric rubber dam and clamp are installed. Then, using a disposable syringe, the remaining mixture is injected directly into the interdental spaces, into the cervical region and onto the fabric rubber dam adjacent to the dental neck. Due to its plastic consistency, the silicone mixture easily adapts and fills the interdental spaces and the spaces between the tooth neck and the tissue rubber dam, ensuring a tight and dry working field. At the end of the treatment procedures, the frozen silicone mixture does not stick to the surface of the gums and teeth and is easily removed without injuring the gums, the neck of the tooth and the dental papilla.

Claims (2)

1. A disposable syringe for a two-gradient dental material containing a tubular cannula connected by a mixing chamber with two cylindrical bodies with pistons placed in cavities and rods connected by a persistent end jumper for fingers, characterized in that the pistons are equipped with sealing rings made of elastic material located at the ends pistons oriented to the mixing chamber, equipped with pointed tubular elements, made for piercing the ends of the outlet channels of the cavities of the cylindrical housings, and the opposite ends of the pistons are made with cone-shaped guide depressions for orienting the tapering ends of the rods, equipped with annular stops for interacting with the end walls of the cylindrical housings at the bottoms hole rods, the diameters of which are less than the diameters of the annular stops by an amount at least greater than the thickness of one end wall, while each cylindrical body at the end is oriented bathtub to the mixing chamber, is made with an annular internal locking recess for the sealing ring, the diameter of which is greater than the diameter of half the depth of the recess, and the cavity of each body is filled with a gradient of dental material required for at least one dose of two-gradient dental material. 2. A tubular cannula for a disposable syringe according to claim 1, containing a mixing chamber with pointed tubular elements made to pierce the ends of the outlet channels of the cavities of cylindrical bodies, the mixing chamber being threaded for connection with two cylindrical bodies of the syringe, and the pointed tubular elements are fixed on the liner installed in the mixing chamber with the possibility of rotation relative to the inner surface of the mixing chamber.

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