RU2627678C2 - Device for heated gutta percha injection into dental canal - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: device for heated gutta percha injection into the dental canal includes a housing with a control unit and a retractable stem with a plunger seal at the end, with an autoclaved sterile replaceable nozzle with a casing and interchangeable needles filled with gutta-percha rods mouted inside. Inside the housing, a heating means is located consisting of a metal tube, on the end part of which, on the needle side, there is a heating coil of the heater, electrically isolated from the metal tube by means of a heat-insulating tape, and a temperature sensor. At the end of the tube, there is an integral connecting sleeve, which is permanently connected to it, to fix the heating medium tube inside the casing and to connect it to the housing with a quick connection. The nozzle with the tube is mounted in the housing with a possibility of separation from the housing by means of a quick connection, and in the connecting sleeve of the tube there are through coaxial holes with electric conductors of electrical connections placed therein.

EFFECT: invention allows to reduce the laboriousness of heated gutta percha injection into the dental canal, reduce the laboriousness of nozzle and needle replacement, and provide a possibility to sterilise them.

7 cl, 24 dwg

Description

The invention relates to the field of dentistry and is intended for use as a means for treating dental canals, namely, for filling (obturation) of a tooth canal with heated gutta-percha.

The final stage of endodontic treatment is obturation of the root canals and their branches with non-destructive material. Three-dimensional obturation of the root canal system prevents re-infection of the periodontium, and also creates favorable conditions for tissue healing.

One of the methods for obturation of root canals is the introduction of thermoplasticized gutta-percha into the canal with its further condensation by a cold or heated plugger.

The first PAC-160 apparatus for supplying (injecting) hot softened gutta-percha, developed in 1981 by Whasledent International (USA), is known. A further modification of this type of apparatus is the OBTURA apparatus.

A device is known for injecting heated gutta-percha into the tooth canal, including a housing with a retractable stem, control and indication means, a tube with a longitudinal cavity for placing a rod and a rod of gutta-percha, equipped with a heater and a temperature sensor, and a removable needle, the cavity of which is connected with the longitudinal in the mounted position cavity of the tube (see the wireless version of the devices of the above type, for example, "System B Endodontic Cordless Fill Unit" (SybronEndo company).

Common to all these devices is the loading of a portion of cold gutta-percha in the form of cylindrical columns with a diameter of about 3 mm and a height of about 12 mm into the chamber, followed by heating them to a temperature of 160-220 ° C and extruding the softened gutta-percha with a piston through the endodontic needle into the tooth canal . The endodontic needle is made of silver alloy to increase thermal conductivity and reduce the cooling of gutta-percha as it passes inside the needle.

Significant disadvantages of all of these devices is that in the known device for changing the needle you need to wait for it to cool, then you need to unscrew the unnecessary needle, screw a new one and continue heating after heating, which together requires a lot of time.

Another significant drawback is the impossibility of sterilizing the needle with the adjacent part of the apparatus by autoclaving, which does not allow you to have several autoclaved sterile nozzles in advance. This is because the part of the device directly adjacent to the needle is permanently attached to the body and therefore not autoclaved.

From RU 2143244, 12/27/1999, an endodontic root canal filling tool (device) is known, made in the form of a holder with a working part, where the working part is made of an alloy with a shape memory effect, previously deformed to reduce the diameter, to press the filling material into the apical part of the root canal of the tooth when filling the canal with filling material.

From RU 2212206, 09/20/2003, another device for filling the pulp cavity and root canals is known, comprising a tip for installation in the pulp cavity, a vacuum pump connected to it, a source of flowing material for filling the pulp cavity, and means for bringing said source into the message with a pulp cavity, while the connection of the tip (1) with a vacuum pump (P) is carried out by means of the first system of connecting tubes (2B, 2d, 12), and the means for bringing the source of fluid material in communication with the pulp cavity is made in the form of a membrane (6), calibrated for destruction at a given pressure, while the membrane (6) is installed on the second system of connecting tubes (2A, 2C, 4) located between the source (9) of fluid material and the tip (one).

However, the above known devices are not used for root canal filling by injection of heated gutta-percha into the tooth canal.

The technical task of the present invention is to eliminate the above disadvantages in a device for filling a tooth channel with heated gutta-percha.

The technical result achieved by the claimed invention is to reduce the complexity of the process of injecting heated gutta-percha into the tooth canal, reduce the complexity of replacing the nozzle and needle, and make it possible to sterilize them by using a detachable connection of the part of the device directly adjacent to the needle to the body.

The problem is solved as a result of the fact that in the device for injecting heated gutta-percha into the tooth canal, which includes a housing with a retractable stem, controls and indicators, a tube equipped with a heater and a temperature sensor with a longitudinal cavity for placement of the gutta-percha rod and rod, and a removable needle , the cavity of which in the mounted position communicates with the longitudinal cavity of the tube, according to the invention, the tube is mounted in the nozzle with the possibility of separation from the housing, and the tube in the separated state allows wish to set up to load a rod of gutta-percha.

This set of common essential features is the essence of the claimed invention. It is necessary and sufficient in all cases of its use.

Thanks to this design, it becomes possible to use several relatively cheap nozzles with a single housing, providing a quick change of nozzles. This allows during the operation using one device to change nozzles with different lengths of needles. In the known device (prototype) for changing the needle, as described above, you need to wait for the needle to cool, then unscrew the unnecessary needle, screw a new needle, warm up the gutta-percha and continue heating after heating, which requires a lot of time.

The claimed device allows you to pre-prepare several nozzles with already filled gutta-percha cylinders. As a result, it becomes possible to quickly replace the tool at the end of gutta-percha (heating time - about 15 seconds).

Another important advantage is the ability to sterilize the nozzle with the needle by autoclaving, which allows you to have several autoclaved sterile nozzles in advance. In the known analogue there is no such possibility, since the nozzle is permanently attached to the body and not autoclavable.

The applicant has developed many variations of the claimed device, relating to both the design of the nozzle and the design of the housing.

At the same time, the applicant considers it necessary to highlight the following developments and / or clarifications of the totality of its essential features relating to some particular cases of implementation or use.

It is desirable that the nozzle with a heater and a temperature sensor, as well as a needle, be made of materials that can be sterilized by autoclaving, in particular withstanding temperatures up to 140 ° C. This will allow you to sterilize the needle with the adjacent part of the apparatus by the autoclaving method, which will allow you to have several autoclaved sterile nozzles in advance.

As a result, the claimed device can be equipped with a set of nozzles with tubes, which improves usability when injecting heated gutta-percha into the tooth canal.

To further improve the usability of the device, to reduce the time it takes to disconnect and connect the nozzle and the housing, it is preferable that the nozzle with the tube be mounted so that it can be separated from the housing using a quick coupler, for example a bayonet mount. In order to achieve the same goal, it is desirable that the tube be mounted so that it can be separated from the housing by means of a quick-disconnect electrical connection provided with spring-loaded electrical contacts.

The invention is illustrated in the drawing.

In FIG. 1 shows a device for injecting heated gutta-percha into the tooth canal, side view;

In FIG. 2 - the same, top view;

In FIG. 3 shows a device housing with a control unit and a sliding rod with a plunger seal at the end;

In FIG. 4 is the same, section AA of FIG. 3;

In FIG. 5 - the same, axonometry;

In FIG. 6 shows a detachable nozzle assembly, a perspective view;

In FIG. 7 - same, top view;

In FIG. 8 is the same, section BB of FIG. 7;

In FIG. 9 shows an assembly of a connecting sleeve and a heater tube, a top view;

In FIG. 10 is the same, section BB of FIG. 9;

In FIG. 11 shows the nozzle cover, a perspective view (the cover is designed to isolate a highly heated part of the device inserted into the patient’s mouth, as well as to protect it from mechanical damage);

In FIG. 12 - same, top view;

In FIG. 13 is the same, section GG of FIG. 12;

In FIG. 14 is the same, view D of FIG. 12;

In FIG. 15 shows a heater tube, a perspective view;

In FIG. 16 is the same longitudinal axial section;

In FIG. 17 - printed circuit board nozzles;

In FIG. 18 is the same, view along arrow E;

In FIG. 19 - reciprocal connecting sleeve of the housing, a perspective view;

In FIG. 20 is the same, section FJ of FIG. 19;

In FIG. 21 shows a circuit board of a housing with spring contacts;

In FIG. 22 is the same, view along arrow AND FIG. 21;

In FIG. 23 is a side view of a pusher of a heated gutta-percha injection device;

In FIG. 24 shows a seal (longitudinal section).

NOTE: since the construction of the gutta-percha rod is not the subject of the invention, and its construction and manipulations with it are obvious, in order not to overload the figures, it is not shown on them.

Description of the claimed device in statics

The device 1 for injecting heated gutta-percha into the tooth canal includes a housing 2 with controls and indicators and a retractable rod with a plunger seal at the end, as well as a nozzle 3 with a needle 4 with a longitudinal through cavity (Fig. 1, Fig. 2).

The nozzle 3, in turn, contains a casing 5, inside which is placed a heating means 6, consisting of a tube 7 and a heater 8 in the form of a heating coil located on the end of the tube 7 from the side of the needle (Fig. 8). The tube 7 is made of stainless steel having a relatively low thermal conductivity. The heater 8 in the form of a heating spiral is electrically isolated from the metal tube 7 using thermal insulation tape (adhesive tape). To this end, one layer of a thermally insulating tape is wound onto the end of the tube 7, onto which a heating spiral, which is a heater 8. is then wound. The tube 7 is separately shown in FIG. 15 and FIG. 16.

To fix the tube 7 of the heating means 6 inside the casing 5, the connecting sleeve 9 of the heater is used, which at the same time provides connection to the casing by means of a bayonet connection or any other connection similar in function, for example, screw. The connecting sleeve 9 of the heater is made, for example, of polycarbonate (high-temperature plastic that can withstand sterilization temperature in an autoclave (135 ° C) or other suitable polymeric material, which is cheap and allows easy molding.

The tube 7 and the connecting sleeve 9 of the heater are inextricably interconnected when casting the connecting sleeve. When connected, they are shown in FIG. 10 and FIG. 9. From the outer surface of the connecting sleeve 9, a groove 10 of the L-shaped bayonet connection is made on it. The flange 11 of the groove 10 is connected to the longitudinal part 12 of the groove 10, which extends to the end 13 of the connecting sleeve 9. The connecting sleeve 9 of the heater is molded from the polymer and in the central part is permanently connected when casting to the tube 7. In addition, longitudinal connections are formed in the connecting sleeve 9 of the heater through coaxial holes 14, designed to accommodate electrical conductors. Their quantity is determined, for example, by the need to skip one or another quantity by a wire of a certain section. In our case, it is necessary to skip four wires.

To prevent the longitudinal and rotational movement of the tube 7 relative to the connecting sleeve 9, grooves 15 are made on the tube 7 (Fig. 16), which are filled with polymer during casting of the connecting sleeve.

Assembled in the tail portion 16 (FIG. 10) of the connecting sleeve 9, a printed circuit board 17 of the nozzle is glued (FIG. 8). To place it in the rear of the connecting sleeve 9, a groove 18 is cast (Fig. 10) in the shape of this printed circuit board. The printed circuit board 17 is provided with pads 19 for connecting to the spring-loaded electrical contacts 20 of the control unit in the housing 2. The pads 19 are electrically connected to the pads 21 on the other side of the printed circuit board 17. The pads 21, in turn, are contacts for soldering wires, connecting the leads (two wires) of the heating coil of the heater 8 and the leads (also two wires) of the temperature sensor 22 (for example, a thermistor).

The assembly of the tube 7 with the connecting sleeve 9 (Fig. 10) is indispensably placed inside the casing 5 (Fig. 8), which is made, for example, of polycarbonate or other polymeric material that can withstand sterilization at a temperature of 135 ° C. The casing 5 is shown in detail in FIG. 11 - FIG. 14. To ensure an indispensable connection in the cavity of the casing 5, corrugations are formed in the form of protrusions 23, which provide a tight fit of the connecting sleeve 9 inside the casing 5 as a result of deformation of the protrusions 23.

To center the tube 7 inside the casing 5 is a ring 24 (Fig. 8) made of silicone or other suitable elastic high-temperature material. The silicone ring 24, stretching, put on in the annular groove 25 at the end of the tube 7 (Fig. 15, Fig. 16).

As noted earlier, the needle 4 is a separate element of the device. To connect the interchangeable needle 4 to the tube 7 at the end of the cavity 26 of the tube 7 (opposite the annular groove 25), a threaded thread 27 was made (Fig. 16, in Fig. 8 and 10, the thread is not indicated so as not to overload the drawing) with thread parameters corresponding to the thread 28 on the outer surface of the thickened end portion 29 of the needle 4.

The connecting sleeve 9 is detachably connected, for example, by means of a bayonet connection with the connecting sleeve 30 of the housing, which is part of the housing 2 of the claimed device with a control unit and a sliding rod 31 with a plunger seal at the end (Fig. 4).

The plunger seal includes a sleeve 32 made of a heat-resistant elastic material, for example fluoroplastic (Fig. 24) with a longitudinal cavity 33. To fix the sleeve 32 on the extension rod 31, a screw 34 is threaded through its longitudinal cavity 33 until the cap stops against the end of the sleeve 32. After that, the screw 34 they are screwed into the screw cavity 35 of the extension rod 31. The sleeve 32 rests against one end of the screw head 34 with one end and the end 36 of the extension rod 31 with the other end. When the screw is further screwed, the extension 32 expands to form a thickening at the end of the extension rod 31 (Fig. 4) .

Let us consider in more detail the design of the connecting sleeve 30 of the housing (Fig. 4, 19-22).

The housing connecting sleeve 30 includes a housing 37 of the housing connecting sleeve and a contact plate 38 of the housing 37 of the device housing connecting sleeve. The contact plate 38 of the housing 37 of the connecting sleeve of the housing of the device has spring-loaded electrical contacts 20, electrically, through connectors 39, connected to wires 40, connected, in turn, to the control board 41 of the device. The contact plate 38 of the housing 37 of the connecting sleeve of the housing of the device is fixed inside its cavity 42 on the annular protrusion 43, for example, by means of an adhesive joint. In the cavity 42 on its inner surface there is a protrusion 44 of the bayonet connection, designed to be placed inside the groove 10 of the G-shaped bayonet connection. A ring 45 made of an elastic material, such as silicone, is used to seal the bayonet joint. The housing 37 of the connecting sleeve with the contact plate 38 is connected to the rest of the housing 2, for example, by means of an adhesive joint.

The manufacture of the claimed device

To assemble the device for injecting heated gutta-percha into the tooth canal, a tube 7 is taken (Fig. 16) and a connecting sleeve 9 is formed on it by injection molding with longitudinal through coaxial holes 14 designed to accommodate electrical conductors (Fig. 8, Fig. 10). After that, a heat-insulating tape (adhesive tape) is wound on the end of the tube 7. A heating coil, which is a heater 8, is wound on top of it. Then, a temperature sensor 22 is attached to the tube 7 with a thermal tape. After that, a printed circuit board 17 with soldered wires that pass through the longitudinal through coaxial holes 14 is glued to the tail part 16 of the connecting sleeve 9. Then the missing wires are electrically connected to the terminals of the heating coil of the heater 8, for example, by electric welding. In addition, another pair of wires is electrically connected to the terminals of the temperature sensor 22. Then, a silicone ring 24 is put in the annular groove 25 at the end of the tube 7. After that, the connecting sleeve 9 is inserted with force into the cavity 46 of the casing 5 against the stop 47, crushing the protrusions 23 to provide a tight one-piece connection. Mount the needle 4 by screwing the thread 28 on the outer surface of the thickened end portion 29 of the needle 4 into the threaded thread 27 inside the end of the cavity 26 of the tube 7.

The assembly of the connecting sleeve 30 of the housing 2 is carried out in the following sequence.

First, take the contact board 38 of the housing 37 of the connecting sleeve 30 of the device body and fix it to the standard purchased spring-loaded electrical contacts 20. by soldering it, then wires 40 are soldered from the back of the contact board 38 to communicate with the control board 41 in the housing 2 (Fig. 21) . The contact plate 38 is fixed inside the cavity 42 to the annular protrusion 43, for example, by means of an adhesive joint. After that, a ring 45 of elastic material intended to tighten the bayonet joint is mounted. Then, after soldering the wires 40 to the control board 41 in the housing 2, the housing 37 of the connecting sleeve of the device housing is fixed to the rest of the housing 2, passing the retractable rod 31 through the hole 48 of the contact board 38.

Pre-assembly of the housing 2 of the device with the control unit and the sliding rod 31, including the connection to it of the connecting sleeve 30 of the housing. The assembly of the elements of the housing 2 is not disclosed, since it is not the subject of the present invention.

As a result of the assembly, we obtain a part of the device in the form of a housing 2 with a retractable rod 31, reciprocating with control from the processor system of the control board, which is standard, does not belong to the subject of the present invention and therefore is not considered in detail.

Device operation

Numerous algorithms for the operation of the device are possible. The following is one of them, without limiting the scope of rights to inventions.

To operate the device, first pick up the assembled nozzle 3 (Fig. 8). Then, a gutta-percha rod is introduced into the cavity 26 of the tube 7, for example, in the form of a cylinder with a diameter slightly smaller than the diameter of the cavity 26 of the tube 7. Move it all the way to the end face 49 of the thickened end part 29 of the needle 4 (Fig. 8). The length of the gutta-percha rod should be slightly less than the maximum stroke length of the retractable rod 31. To enter the gutta-percha rod, it is enough to place the assembled nozzle 3 vertically with the needle down. In this case, under the influence of its own weight, it spontaneously falls on the end 49 of the thickened end part 29 of the needle 4.

After that, the retractable rod 31 is introduced into the cavity 26 of the tube 7 in an intermediate position without stop in the end face of the gutta-percha rod, having previously adjusted the position of the retractable rod 31.

Then, the nozzle 3 is fixed by bayonet connection to the connecting sleeve 30 of the housing 2. In this case, after the protrusion 44 is turned all the way into the flange 11 of the groove 10, all spring-loaded electrical contacts 20 of the contact board 38 are in contact with the corresponding contact pads 19 of the printed circuit board 17.

After that, they take the case 2 with the attached nozzle 3 into their hands and, by pressing the button 50 (Fig. 5), a voltage is applied to the heating coil of the heater 8 through the control board. The gutta-percha of the core is heated from gutta-percha to a plastic (almost liquid) state. Look at the temperature indicated by the temperature sensor 22 shown on the display 51. After reaching the necessary heating (in the temperature range 160-220 degrees Celsius) for the obturation of the tooth canal (that is, for filling the canal with heated gutta-percha), the end of the needle 4 is inserted to a certain depth into the tooth canal. Then, by pressing individual presses of the button 52, heated heated gutta-percha is fed in controlled small portions into the tooth canal by extrusion as a result of small extensions of the retractable rod 31.

After the end of the obturation or to change the rod from gutta-percha, the end of the needle 4 is removed from the tooth canal. Then, by pressing the retractable rod extraction button 53, the retractable rod 31 is automatically moved back to the initial state.

To reload the rod from gutta-percha, the bayonet connection is disconnected, the nozzle 3 is separated from the body 2 and a new gutta-percha rod is introduced into the opened cavity 26 of the tube 7.

Next, the operations are repeated according to the above description of the work.

Thanks to the claimed design, the opportunity arises

use several relatively cheap nozzles with one housing, providing the possibility of quick change of nozzles. This allows during the operation to carry out using a single device change nozzles with different lengths of needles. In the known device (prototype), to change the needle, you need to wait for the needle to cool, then you need to unscrew the unnecessary needle, attach a new needle by screwing it, heat it up and continue working only after heating, which requires a lot of time. The claimed device allows you to pre-prepare several nozzles with already filled gutta-percha rods. Thanks to this, a quick tool change at the end of gutta-percha is possible (heating time - about 15 seconds).

Another important advantage of the claimed device is the ability to sterilize separately nozzles with a needle by autoclaving. For autoclaving, the nozzle is separated from the body. This allows you to have several autoclaved sterile nozzles in advance. In the closest known analogue there is no such possibility, since the nozzle is permanently attached to the body and therefore not autoclavable.

The invention improves the usability, reduce the burden on the treating person (doctor), facilitate the cleaning and sterilization of the instrument.

In addition to the above embodiment of the invention, numerous other modifications are possible.

All of them are covered by the following claims.

Claims (7)

1. A device for injecting heated gutta-percha into the tooth canal, including a housing (2) with a control unit and a sliding rod with a plunger seal at the end, inside of which an autoclaved sterile interchangeable nozzle (3) is mounted with a casing (5) and with interchangeable needles (4) filled with gutta-percha rods, inside the casing there is a heating device (6) consisting of a metal tube (7), on the end part of which from the side of the needle there is a heating coil of the heater, electrically isolated from the metal tube and using a heat-insulating tape, and a temperature sensor, at the same time at the end of the tube there is a connecting sleeve (9) that is permanently connected to it for fixing the heating means tube inside the casing and connecting it to the casing by means of a quick-disconnect connection, the nozzle with the tube is mounted in the casing with the possibility of separation from the housing by means of a quick-connect, and in the connecting sleeve of the tube there are molded through coaxial holes with electrical conductors of electric Connections. 2. The device according to p. 1, characterized in that the nozzle with a heater and a temperature sensor, as well as a needle, are made of materials that can be sterilized by autoclaving. 3. The device according to claim 2, characterized in that the nozzle with a needle, a heater and a temperature sensor are made of materials that can withstand temperatures up to 140 ° C. 4. The device according to p. 1, characterized in that the device is equipped with a set of nozzles with tubes. 5. The device according to p. 1, characterized in that the nozzle with the tube is mounted with the possibility of separation from the housing using a quick coupler. 6. The device according to p. 5, characterized in that the quick connection is a bayonet connection. 7. The device according to p. 1, characterized in that the tube is mounted with the possibility of separation from the housing using a quick disconnect electrical connection, equipped with spring-loaded electrical contacts.

Images