CN111000638A

CN111000638A - Rotary ultrasonic vibration composite dental hand bender

Info

Publication number: CN111000638A
Application number: CN201911330326.XA
Authority: CN
Inventors: 宋晓菲; 马华润; 陈兴鹏; 许可; 王越; 张译尹
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-04-14
Anticipated expiration: 2039-12-20
Also published as: CN111000638B

Abstract

The invention discloses an ultrasonic vibration rotary dental curved handpiece, which comprises a handpiece, a handpiece and a handpiece tail; an ultrasonic vibration device and a wireless power transmission device are arranged in the machine head, and the wireless power transmission device supplies power to the ultrasonic vibration device; the output end of a horn of the ultrasonic vibration device is connected with a needle, and the needle performs ultrasonic high-frequency vibration under the action of the ultrasonic vibration device; the amplitude transformer is provided with a first gear; the handle transmits the rotary power of the tail into the machine head, and the tail transmits the power transmitted by the electric motor to the handle and then to the needle at the machine head, so that the needle is driven to rotate. The invention discloses a rotary ultrasonic vibration composite dental bender for dental restoration, which is characterized in that an ultrasonic high-frequency vibration technology is combined on a conventional dental rotary restoration technology, and the rotary ultrasonic vibration composite dental bender for dental restoration is provided.

Description

Rotary ultrasonic vibration composite dental hand bender

Technical Field

The invention relates to a medical cutting instrument for preparing a tooth in an oral cavity, in particular to a rotary ultrasonic vibration composite dental bender.

Background

Tooth preparation is an essential key procedure in the clinic of oral cavity restoration, and is also an oral cavity restoration operation with the highest application frequency. In the dental restoration process, a doctor usually needs to shape and grind an affected tooth, and at this time, the dentist uses a dental cutting instrument (i.e., a dental handpiece) to prepare the affected tooth in the oral cavity through operations such as cutting, removing and grinding.

The tooth preparation refers to the technical operation of removing caries and modifying the appearance of the adjacent teeth of the affected tooth or the lost tooth through a dental instrument so as to meet the requirements of retention, support, appearance, beauty and function of a subsequent prosthesis in order to recover, improve or reconstruct the anatomical appearance and physiological function of the lost tooth. Since the dental preparation needs to be performed inside the mouth, the dental instruments used can only be dental handpieces. During the dental preparation process, the rotating speed of the dental bending handpiece reaches 20 ten thousand revolutions per minute, and the diameter of the lathe needle is only 1.4mm, which easily causes excessive cutting temperature and excessive cutting force, damages dental pulp and gum for a long time and seriously influences the comfort of a patient. It is appreciated that current dental burs for dental preparation surgery have not met clinical requirements and there is a need for improved innovations in current dental burs.

Researches show that the material removal rate can be improved, the cutting force can be obviously reduced, and the material surface cutting quality can be improved by coupling ultrasonic vibration in the traditional industrial rotary machining. The medical field has applied ultrasonic technology to ultrasonic osteotomes and ultrasonic tooth cleaners, the ultrasonic osteotomes use a piezoelectric conversion device to convert electrical energy into mechanical energy to enable a titanium alloy cutting head to be in a high-frequency resonance mode, and use a surgical tool to crush and cut bone tissues or tooth bodies by using strong mechanical acceleration of the cutting head. However, the material removing type cutter only has simple linear reciprocating ultrasonic high-frequency motion, the shape of the cut tissue is single, the material removing efficiency is extremely low, and the material removing type cutter cannot be applied to tooth preparation. The ultrasonic dental scaler is similar to an ultrasonic osteotome, generates high-frequency vibration by utilizing a piezoelectric effect, mainly removes calculi and plaques on the surface of teeth, has lower power than the ultrasonic osteotome, and has amplitude smaller than that of the ultrasonic osteotome. The power of the ultrasonic tooth cleaner can only be used for dirt on the surface of the tooth, and the tooth tissue cannot be removed. Therefore, in order to create an efficient and excellent oral appliance for dental preparation, the ultrasonic vibration technology is applied to a dental bender in order to improve the cutting efficiency, the surface quality of the dental body and the comfort of the patient.

Disclosure of Invention

The invention aims to overcome the defects in the existing tooth preparation technology and provide a rotary ultrasonic vibration composite dental bender which has the advantages of improving cutting efficiency, reducing cutting force, improving tooth preparation quality and the like compared with the conventional dental bender.

The technical scheme adopted by the invention is as follows: an ultrasonic vibration rotary dental elbow machine comprises a machine body and a machine needle, wherein the machine body comprises a machine head, a machine handle and a machine tail which are sequentially connected;

an ultrasonic vibration device and a wireless power transmission device are arranged in the machine head, and the wireless power transmission device supplies power to the ultrasonic vibration device; the output end of a horn of the ultrasonic vibration device is connected with the needle, and the needle performs ultrasonic high-frequency vibration under the action of the ultrasonic vibration device; the amplitude transformer is provided with a first gear;

a first transmission shaft is arranged in the machine handle, a second gear is arranged at one end, close to the machine head, of the first transmission shaft, the second gear is meshed with the first gear, and an outer bevel gear is arranged at one end, close to the machine tail, of the first transmission shaft;

the needle turning device is characterized in that a second transmission shaft is arranged in the tail, an inner bevel gear is arranged at one end, close to the handle, of the second transmission shaft, the inner bevel gear is meshed with the outer bevel gear, the second transmission shaft is connected with a clutch, the clutch is driven to rotate by an electric motor, rotary motion is transmitted to the first gear through the second transmission shaft and the first transmission shaft, and then the ultrasonic vibration device is driven to rotate through the first gear, so that the needle connected with the amplitude transformer is driven to rotate.

Furthermore, the ultrasonic vibration device comprises an amplitude transformer and an energy converter, the energy converter is formed by alternately arranging piezoelectric ceramic rings and electrode plates, and the wireless power transmission device transmits current to the electrode plates of the energy converter, so that the piezoelectric ceramic rings generate high-frequency vibration, and the high-frequency vibration is transmitted to the vehicle needle through the amplification effect of the amplitude transformer.

Further, the first gear is disposed at a node of the horn where the amplitude of the ultrasonic vibration is zero.

Further, the wireless power transmission device comprises an inner coil and an outer coil;

the inner coil is connected with a transducer and an amplitude transformer of the ultrasonic vibration device through a double-end stud and is compressed through a locking nut, and the inner coil rotates along with the ultrasonic vibration device during operation; the outer ring of the inner coil is wound with a first lead, and the first lead is connected to the electrode plate of the transducer;

the outer coil is fixed on the periphery of the inner coil, a second wire is wound on the inner ring of the outer coil and connected with a third wire, the third wire is communicated with high-frequency alternating current, so that the outer coil is communicated with high-frequency alternating current, the inner coil generates induced current under the action of electromagnetic induction, the electrode plates are powered through the first wire, and then the piezoelectric ceramic ring generates piezoelectric effect to vibrate.

Further, the outer coil is fixedly connected in the handpiece wall of the handpiece through a handpiece sleeve; a boss is arranged on the outer surface of the outer coil and connected with the first groove in the inner wall of the handpiece sleeve in an interference fit manner; the outer wall of the machine head sleeve is provided with a protrusion, the protrusion is matched with a machine head wall inner groove in the machine head wall to prevent the machine head sleeve from rotating, a flange is arranged at the top of the machine head sleeve and abuts against an inner wall boss of the machine head wall, the machine head sleeve is tightly pressed through a machine head end cover, and therefore the outer coil is fixed.

Furthermore, a wire guide hole is formed in the side wall of the handpiece sleeve, and the third wire penetrates through the wire guide hole and is connected to the second wire of the outer coil.

The invention has the beneficial effects that: the invention provides a rotary ultrasonic vibration composite dental bender for preparing a tooth body in an oral cavity, which changes the mechanism of removing the surface of a tooth tissue by an ultra-0-sound high-frequency vibration energy coupling high-speed rotary cutting technology, improves the cutting efficiency of the tooth body, reduces the cutting force by 40 to 50 percent at most and effectively reduces the damage to the surface of the tooth body and the degree of edge breakage compared with the clinical existing dental bender, thereby improving the preparation quality of the tooth body and the clinical comfort of a patient. In addition, the ultrasonic composite dental handpiece can reduce the cutting temperature in the tooth preparation process, and effectively avoids the thermal damage to surrounding soft tissues caused by the existing tooth preparation method.

Drawings

FIG. 1: the invention discloses a schematic diagram of the whole structure of a rotary ultrasonic vibration composite dental curved handpiece;

FIG. 2: the internal structure of the handpiece of the invention is schematically shown;

FIG. 3: the structure of the ultrasonic vibration device is schematic;

FIG. 4: the transducer structure of the ultrasonic vibration device is schematic;

FIG. 5: the structure of the handpiece sleeve is schematically shown;

FIG. 6: the structure of the wireless power transmission device is shown schematically;

FIG. 7: the second gear and the bevel gear are connected with the first transmission shaft.

The attached drawings are marked as follows:

1-head 2-spring

3-locking nut 4-fourth bearing

5-handpiece sleeve 5-1-second groove

5-2-projection 5-3-wire hole

5-4-first groove 5-flange

6-machine head wall 6-1-machine head wall internal groove

7-outer coil 7-1-second conducting wire

7-2-boss

8-inner coil 8-1-first wire

9-stud 10-transducer

10-1-piezoelectric ceramic ring 10-2-electrode plate

11-first gear 12-horn

13-needle 14-fifth bearing

15-water pipe 16-second shaft sleeve

17-second retainer ring 18-third bearing

19-second gear 20-handpiece end cover

21-first drive shaft 22-third conductor

23-inner wall of handle 24-handle

25-conduit 26-second bearing

27-inner cone gear 28-outer cone gear

29-tail 30-first retainer ring

31-first sleeve 32-retaining ring

33-first bearing 34-compression spring

35-second transmission shaft 36-sleeve

37-pin 38-clutch

39-first pin 40-second pin

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:

as shown in fig. 1 to 7, the ultrasonic vibration rotary dental curved handpiece comprises a body and a needle 13, wherein the body mainly comprises a handpiece 1, a handpiece 24 and a handpiece tail 29 which are connected in sequence.

The internal structure of the handle 24 and the tail 29 is mainly used for transmitting the power of an external motor to the needle 13 in the handpiece 1, so that the needle 13 rotates at a high speed.

The interior of the machine tail 29 mainly comprises an inner bevel gear 27, a first shaft sleeve 31, a second transmission shaft 35, a compression spring 34, a clutch 38, a pin shaft 37 and the like, and aims to transmit power transmitted by an electric motor to the machine handle 24 and further to the needle 13 at the machine head 1. Second transmission shaft 35 is close to the one end external connection of handle 24 has first bearing 33, first bearing 33 is used for supporting the rotation of second transmission shaft 35, first bearing 33 is installed in first axle sleeve 31, through the inside boss of first axle sleeve 31 blocks the outer lane of first bearing 33, first axle sleeve 31 with the inner wall tight fit of tail 29, just the head of first axle sleeve 31 is provided with the flange, supports the shell of tail 29. The second transmission shaft 35 is welded with the inner bevel gear 27 at the joint of the tail 29 and the handle 24, the inner bevel gear 27 extends into the handle 24 to be meshed with the outer bevel gear 28, and a first retainer ring 30 is arranged between the inner bevel gear 27 and the first bearing 33. The clutch 38 has one end externally connected to an electric motor for power transmission, and the other end connected to the second transmission shaft 35 through a pin 37. The pin shaft 37 is sleeved with a sleeve 36 to prevent the pin shaft 37 from falling off, the sleeve 36 abuts against the clutch 38 through a compression spring 34, the other end of the compression spring 34 abuts against a retaining ring 32, and the retaining ring 32 retains an inner ring of the first bearing 33.

The internal components of the machine handle 24 mainly include a first transmission shaft 21, a second gear 19, an outer bevel gear 28, a second bushing 16, a second bearing 26, a third bearing 18 and the like, so as to transmit the rotation power of the machine tail 29 into the machine head 1. As shown in fig. 7, a second gear 19 is arranged on one side of the first transmission shaft 21 close to the handpiece 1, the second gear 19 is connected with the first transmission shaft 21 through a first pin 39, and the second gear 19 extends into the handpiece 1 and is meshed with the first gear 11 in the handpiece 1 to transmit power; an outer bevel gear 28 is arranged on one side of the first transmission shaft 21 close to the tail 29, the outer bevel gear 28 is connected with the first transmission shaft 21 through a second pin 40, and the outer bevel gear 28 is meshed with the inner bevel gear 27. The second bearing 26 and the third bearing 18 are respectively disposed at two ends of the first transmission shaft 21, and the second bearing 26 and the third bearing 18 are mounted on the first transmission shaft 21 through a second bushing 16 for supporting the rotation of the first transmission shaft 21, and the second bushing 16 is connected with a handle inner wall 23 through tight fit. A second retainer 17 is used to retain the inner races of the second bearing 26 and the third bearing 18.

In addition, a conduit 25 and a water pipe 15 are arranged in the machine tail 29 and the machine handle 24, wherein a third conductor 22 is arranged in the conduit 25, and the third conductor 22 is externally connected with high-frequency alternating current to electrify the ultrasonic vibration device at the machine head 1.

As shown in fig. 2, an ultrasonic vibration device, a first gear 11, a wireless power transmission device, a fourth bearing 4, a fifth bearing 14, a handpiece sleeve 5, a spring 2, a handpiece end cover 20, and the like are arranged in the handpiece 1. As shown in fig. 3, the ultrasonic vibration device can make the needle 13 vibrate with high frequency and small amplitude, and comprises an amplitude transformer 12 and a transducer 10, the amplitude transformer 12, the transducer 10 and the inner coil 8 of the wireless power transmission device are connected together by a stud 9, and are compressed by a lock nut 3, so as to better transmit vibration. As shown in FIG. 4, the transducer 10 is composed of piezoelectric ceramic rings 10-1 and electrode plates 10-2 stacked alternately. As shown in fig. 6, the wireless power transmission device includes an inner coil 8 and an outer coil 7, and power transmission is performed by wireless induction transmission through the inner coil 8 and the outer coil 7; when the ultrasonic vibration device works, the inner coil 8 rotates along with the ultrasonic vibration device, a first lead 8-1 is wound on the outer ring of the inner coil 8, and the first lead 8-1 is connected to an electrode plate 10-2 of the transducer 10; the outer coil 7 is fixed on the periphery of the inner coil 8 and is not moved, a second lead 7-1 is wound on the inner ring of the outer coil 7, the second lead 7-1 is connected with the third lead 22, the third lead 22 is supplied with high-frequency alternating current, so that the outer coil 7 is supplied with high-frequency alternating current, the inner coil 8 generates induced current under the action of electromagnetic induction, the current of the inner coil 8 is transmitted to the electrode plate 10-2 of the energy converter 10 through the first lead 8-1 to supply power to the electrode plate 10-2, so that the piezoelectric ceramic ring 10-1 generates piezoelectric effect and vibrates, and then the high-frequency vibration is transmitted to the needle 13 after the amplification effect of the amplitude transformer 12.

The outer coil 7 is fixedly connected in a handpiece wall 6 of the handpiece 1 through a handpiece sleeve 5, as shown in fig. 5 and 6, a boss 7-2 is arranged on the outer surface of the outer coil 7, and the boss 7-2 is connected and fixed with a first groove 5-4 on the inner wall of the handpiece sleeve 5 through interference fit; the outer wall of the machine head sleeve 5 is provided with a bulge 5-2, the bulge 5-2 is matched with a machine head wall inner groove 6-1 on the machine head wall 6 to prevent the machine head sleeve 5 from rotating, the top of the machine head sleeve 5 is provided with a flange 5-5, the flange 5-5 is abutted against an inner wall boss of the machine head wall 6, and finally, the machine head sleeve 5 is pressed through a machine head end cover 20 to fix the outer coil 7; in addition, a wire guide hole 5-3 is formed in the side wall of the handpiece sleeve 5, and the third wire 22 is connected to the second wire 7-1 of the outer wire through the wire guide hole 5-3.

The fourth bearing 4 and the fifth bearing 14 are used for supporting the rotation of the ultrasonic vibration device; the fourth bearing 4 is mounted on the amplitude transformer 12; the fifth bearing 14 is mounted on the locking nut 3, the outer ring of the fifth bearing 14 is matched with the handpiece sleeve 5, the second groove 5-1 on the inner wall of the handpiece sleeve 5 is abutted against the outer ring of the fifth bearing 14 to prevent the fifth bearing 14 from moving axially, and after the fifth bearing 14 is mounted, the handpiece end cover 20 is connected with the handpiece wall 6 through threads to press the handpiece sleeve 5 tightly. The spring 2 is arranged between the handpiece end cover 20 and the locking nut 3 and is used for pre-tightening the whole ultrasonic vibration device.

The first gear 11 is welded at the large end of the amplitude transformer 12, the welding position is the node position of the amplitude transformer 12, the amplitude of the ultrasonic vibration is zero, and the first gear 11 is installed at the node position, so that the ultrasonic vibration is not influenced, and the problem of rotary motion transmission is solved; the first gear 11 is engaged with the second gear 19, the rotational motion transmitted from the motor is transmitted to the first gear 11 through the second transmission shaft 35 and the first transmission shaft 21, and the ultrasonic vibration device is driven to rotate through the first gear 11, so that the needle 13 in threaded connection with the horn 12 is driven to rotate.

The ultrasonic vibration device and the axis of the needle 13 are perpendicular to the axis of the first transmission shaft 21, and the axis of the first transmission shaft 21 and the axis of the second transmission shaft 35 are arranged at an angle.

When the invention works, power is transmitted to the second gear 19 in the machine head 1 through the transmission device in the machine tail 29 and the transmission device in the machine handle 24, the second gear 19 is meshed with the first gear 11, the first gear 11 and the amplitude transformer 12 are welded together, so that the amplitude transformer 12 is driven to rotate at high speed, the needle 13 is connected with the amplitude transformer 12 through threads, and the needle 13 can rotate at high speed. Meanwhile, the third lead 22 supplies power to the outer coil 7 by the high-frequency alternating current, and the inner coil 8 generates an induced current, thereby completing wireless power transmission. The inner coil 8 transmits current to an electrode plate 10-2 of the transducer 10 through a first lead 8-1, and due to piezoelectric effect, the piezoelectric ceramic ring 10-1 generates high-frequency vibration which is transmitted to the amplitude transformer 12 and is amplified and further transmitted to the needle 13. At this time, the needle 13 is rotated at a high speed and also vibrated in the high-frequency axial direction. By the invention, high-speed rotary motion and ultrasonic vibration can be coupled at the position of the needle 13, so that the compound function of rotary motion and ultrasonic high-frequency vibration is realized, and the purpose of auxiliary grinding by ultrasonic vibration is achieved.

In conclusion, the invention provides a rotary ultrasonic vibration composite dental curved hand machine for dental restoration, which is combined with an ultrasonic high-frequency vibration technology on the basis of a conventional dental rotary restoration technology. The rotary ultrasonic dental bender can obviously improve the tooth preparation efficiency, reduce the cutting force in the tooth preparation process, improve the tooth surface repair quality and improve the comfort of patients.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. An ultrasonic vibration rotary dental curved handpiece comprises a handpiece and a needle (13), and is characterized in that the handpiece comprises a handpiece (1), a handle (24) and a handpiece tail (29) which are connected in sequence;

an ultrasonic vibration device and a wireless power transmission device are arranged in the handpiece (1), and the wireless power transmission device supplies power to the ultrasonic vibration device; the output end of an amplitude transformer (12) of the ultrasonic vibration device is connected with the sewing needle (13), and the sewing needle (13) performs ultrasonic high-frequency vibration under the action of the ultrasonic vibration device; the amplitude transformer (12) is provided with a first gear (11);

a first transmission shaft (21) is arranged in the machine handle (24), a second gear (19) is arranged at one end, close to the machine head (1), of the first transmission shaft (21), the second gear (19) is meshed with the first gear (11), and an outer bevel gear (28) is arranged at one end, close to the machine tail (29), of the first transmission shaft (21);

a second transmission shaft (35) is arranged in the tail (29), an inner bevel gear (27) is arranged at one end, close to the handle (24), of the second transmission shaft (35), the inner bevel gear (27) is meshed with the outer bevel gear (28), the second transmission shaft (35) is connected with a clutch (38), the clutch (38) is driven to rotate by an electric motor, rotary motion is transmitted to the first gear (11) through the second transmission shaft (35) and the first transmission shaft (21), and then the ultrasonic vibration device is driven to rotate through the first gear (11), so that the sewing needle (13) connected with the amplitude transformer (12) is driven to rotate.

2. An ultrasonic vibration rotary dental bender as claimed in claim 1, characterized in that said ultrasonic vibration device comprises a horn (12) and a transducer (10), said transducer (10) is composed of a piezoelectric ceramic ring (10-1) and an electrode plate (10-2) which are arranged alternately, said wireless transmission device transmits current to the electrode plate (10-2) of said transducer (10), so as to make the piezoelectric ceramic ring (10-1) generate high frequency vibration, and then transmits the high frequency vibration to said needle (13) after amplification action of said horn (12).

3. An ultrasonically vibrating rotary dental bender according to claim 1, characterized in that said first gear wheel (11) is arranged at a node of said horn (12), where the amplitude of the ultrasonic vibrations is zero.

4. An ultrasonically vibrating rotary dental bender according to claim 2, characterized in that said wireless power transmission means comprises an inner coil (8) and an outer coil (7);

the inner coil (8) is connected with a transducer (10) and an amplitude transformer (12) of the ultrasonic vibration device through a double-end stud (9) and is compressed through a locking nut (3), and the inner coil (8) rotates together with the ultrasonic vibration device during operation; a first lead (8-1) is wound on the outer ring of the inner coil (8), and the first lead (8-1) is connected to an electrode plate (10-2) of the transducer (10);

the outer coil (7) is fixed on the periphery of the inner coil (8), a second lead (7-1) is wound on the inner ring of the outer coil (7), the second lead (7-1) is connected with a third lead (22), the third lead (22) is supplied with high-frequency alternating current, so that the outer coil (7) is supplied with the high-frequency alternating current, the inner coil (8) generates induced current under the action of electromagnetic induction, the electrode plate (10-2) is supplied with power through the first lead (8-1), and the piezoelectric ceramic ring (10-1) generates piezoelectric effect and vibrates.

5. An ultrasonically vibrating rotary dental bender according to claim 4, characterized in that said outer coil (7) is fixedly attached within the handpiece wall (6) of said handpiece (1) by means of a handpiece sleeve (5); a boss (7-2) is arranged on the outer surface of the outer coil (7), and the boss (7-2) is connected with a first groove (5-4) on the inner wall of the handpiece sleeve (5) in an interference fit manner; the outer wall of the machine head sleeve (5) is provided with a protrusion (5-2), the protrusion (5-2) is matched with a machine head wall inner groove (6-1) in the machine head wall (6) to prevent the machine head sleeve (5) from rotating, a flange is arranged at the top of the machine head sleeve (5) and abuts against a boss on the inner wall of the machine head wall (6), and the machine head sleeve (5) is tightly pressed through a machine head end cover (20), so that the outer coil (7) is fixed.

6. An ultrasonically vibrating rotary dental bender according to claim 5, characterized in that said handpiece sleeve (5) is provided with wire guides (5-3) in its side wall, and said third wire (22) is connected to the second wire (7-1) of said outer coil (7) through said wire guides (5-3).