Anti-suckback dental handpiece

Abstract

The present invention discloses an anti-back-suction dental handpiece, comprising a handpiece, wherein the handpiece comprises a turbine, a bearing, a water spray seat, a machine core shaft and a turning needle, wherein the turning needle is mounted on the machine core shaft, and the turbine, the bearing and the water spray seat are sequentially mounted on the machine core shaft, a gap is formed between the machine core shaft and the water spray seat, and the anti-back-suction dental handpiece further comprises an anti-back-suction component, wherein the anti-back-suction component comprises a sealing ring, which is made of elastic material, the sealing ring is sleeved on the machine core shaft and forms a gap with the machine core shaft, the sealing ring is located between the bearing and the water spray seat, and when negative pressure is formed inside the handpiece, the sealing ring radially contracts and fits with the machine core shaft to make the gap disappear, the gap is blocked by the sealing ring, and oral fluid cannot be back-sucked into the inside of the handpiece through the gap.

Description

Technical Field

[0001] The invention relates to a dental handpiece, in particular to an anti-suckback dental handpiece. Background Art

[0002] As people become more aware of caring for their teeth, they often perform tooth cleaning, filling, and grinding to bring their teeth to an ideal state. The most commonly used dental instrument is the dental handpiece. Dental handpieces are divided into slow-speed handpieces and high-speed handpieces. Slow-speed handpieces are mainly used to clean and polish teeth, while high-speed handpieces are used clinically to grind and cut teeth. The principle of both slow-speed and high-speed handpieces is to blow the turbine with a certain air pressure, thereby driving the needle to run at high speed. The speed of the needle on the handpiece is very high, and the needle is pressed and fixed by the machine core shaft, and there is always a certain gap between the machine core shaft and the internal structure of the handpiece, although it is very small. However, since the rotation of the needle in the dental handpiece handpiece is an energy conversion that converts air pressure into the rotation of the impeller and the needle, air pressure is the source of energy.

[0003] However, the internal structure of the dental handpiece currently on the market causes negative air pressure to be generated inside the handpiece after the dental handpiece stops working, causing the fluid in the patient's mouth to be sucked back. The suckback can easily cause oral fluid to flow back into the handpiece and the inside of the handpiece handle, causing various damages to the handpiece and the inside of the dental handpiece. When the handpiece is not completely disinfected, the oral fluid suckback may cause cross-infection between patients, and also reduce the energy conversion rate of air pressure. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide an anti-suckback dental handpiece which can prevent oral fluid from being sucked back after the dental handpiece stops working.

[0005] One of the purposes of the present invention is achieved by the following technical solution:

[0006] A back-sucking prevention dental handpiece comprises a handpiece, the handpiece comprises a turbine, a bearing, a water spray seat, a machine core shaft and a turning needle, the turning needle is mounted on the machine core shaft, the turbine, the bearing and the water spray seat are sequentially mounted on the machine core shaft, a gap is formed between the machine core shaft and the water spray seat, the back-sucking prevention dental handpiece further comprises an back-sucking prevention component, the back-sucking prevention component comprises a sealing ring, the sealing ring is made of elastic material, the sealing ring is sleeved on the machine core shaft and a gap is formed between the machine core shaft, the sealing ring is located between the bearing and the water spray seat, when negative pressure is formed inside the handpiece, the sealing ring radially contracts and fits with the machine core shaft to make the gap disappear, and the gap is blocked by the sealing ring.

[0007] Furthermore, the sealing ring is made of fluoroplastic.

[0008] Furthermore, the sealing ring is provided with a first mounting groove, the first mounting groove extends to the inner wall of the sealing ring, and the anti-back-sucking assembly also includes a first sealing ring, and the first sealing ring is movably installed in the first mounting groove.

[0009] Further, the depth of the first installation groove is greater than the height of the first sealing ring, and the first sealing ring can move axially along the movement axis in the first installation groove.

[0010] Furthermore, the inner diameter of the first sealing ring is smaller than the inner diameter of the sealing ring, so as to prevent the core shaft from rubbing against the sealing ring when the anti-suckback dental handpiece is working.

[0011] Furthermore, the first sealing ring is a metal ring.

[0012] Furthermore, the sealing ring is provided with a second mounting groove, the second mounting groove extends to the outer wall of the sealing ring, the anti-back-suction assembly also includes a second sealing ring, the second sealing ring is installed in the second mounting groove, and the second sealing ring is in conflict with the bearing.

[0013] Furthermore, the second sealing ring is a metal ring.

[0014] Furthermore, the machine head also includes a shell and a cover body, the turbine, bearing, machine core shaft, anti-back-suction assembly and water spray seat are accommodated in the shell, and the cover body is fixed to the top of the shell.

[0015] Furthermore, the shell is provided with an internal thread, and the cover body is provided with an external thread, and the external thread cooperates with the internal thread to fix the cover body to the shell.

[0016] Compared with the prior art, the anti-backsuck dental mobile phone of the present invention further includes an anti-backsuck component, which includes a sealing ring made of elastic material. The sealing ring is sleeved on the machine core shaft and forms a gap with the machine core shaft. The sealing ring is located between the bearing and the water spray seat. When negative pressure is formed inside the machine head, the sealing ring radially contracts and fits with the machine core shaft to eliminate the gap. The gap is blocked by the sealing ring, and oral fluid cannot be sucked back into the machine head through the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of the anti-suckback dental handpiece of the present invention;

[0018] Figure 2 for Figure 1 Exploded view of the handpiece of the anti-suckback dental handpiece;

[0019] Figure 3 for Figure 2 An exploded view of the anti-suckback assembly of the handpiece;

[0020] Figure 4 for Figure 2 A cross-sectional view of the nose of the aircraft;

[0021] Figure 5 for Figure 4 An enlarged view of the nose A.

[0022] In the figure: 10, machine head; 11, housing; 12, cover; 13, turbine; 14, bearing; 15, movement shaft; 16, needle; 17, anti-backsucking assembly; 170, sealing ring; 1701, mounting hole; 1702, first mounting groove; 1703, second mounting groove; 1704, boss; 171, first sealing ring; 172, second sealing ring; 18, water spray seat; 19, gap; 20, handle. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] Figures 1 to 5 The anti-suckback dental handpiece of the present invention comprises a handpiece 10 and a handle 20 , wherein the handpiece 10 is mounted at the end of the handle 20 .

[0027] The machine head 10 includes a housing 11 , a cover 12 , a turbine 13 , a bearing 14 , a machine core shaft 15 , a needle 16 , an anti-backsucking assembly 17 and a water spray seat 18 .

[0028] The housing 11 is a hollow structure, and an inner thread is provided on the inner wall at the top of the housing 11 .

[0029] The outer wall of the cover body 12 is provided with an external thread.

[0030] The anti-back-sucking assembly 17 includes a sealing ring 170, a first sealing ring 171 and a second sealing ring 172. The sealing ring 170 is made of carbon new material. In the present embodiment, the sealing ring 170 is made of fluoroplastic. The sealing ring 170 is provided with a mounting hole 1701, a first mounting groove 1702, a second mounting groove 1703 and a boss 1704. The mounting hole 1701 is a circular hole. The mounting hole 1701, the first mounting groove 1702, the boss 1704 and the second mounting groove 1703 are arranged in sequence from the inside to the outside. The boss 1704 is located between the first mounting groove 1702 and the second mounting groove 1703. The first mounting groove 1702 extends to the inner wall of the sealing ring 170. The second mounting groove 1703 extends to the outer wall of the sealing ring 170. The first sealing ring 171 and the second sealing ring 172 are both metal rings. The height of the first sealing ring 171 is less than the depth of the first mounting groove 1702. The inner diameter of the first sealing ring 171 is smaller than the inner diameter of the first installation groove 1702. The height of the second sealing ring 172 is the same as the depth of the second installation groove 1703.

[0031] When assembling the anti-suckback dental handpiece, the first sealing ring 171 is installed in the first mounting groove 1702, and the second sealing ring 172 is installed in the second mounting groove 1703, forming the anti-suckback assembly 17. The needle 16 is pressed and fixed to the machine core shaft 15. The anti-suckback assembly 17, the bearing 14, and the turbine 13 are sequentially installed on the machine core shaft 15. The anti-suckback assembly 17, the bearing 14, the turbine 13, and the machine core shaft 15 are accommodated in the housing 11. The external thread of the cover body 12 cooperates with the internal thread of the housing 11 to fix the cover body 12 to the housing 11. The water spray seat 18 is installed at the bottom of the housing 11. At this time, a gap 19 is formed between the water spray seat 18 and the machine core shaft 15.

[0032] When the anti-suckback dental handpiece works normally, the turbine 13 drives the needle 16 to rotate in height, the inside of the handpiece 10 is positively pressurized, and the first sealing ring 171 contacts the bottom of the first mounting groove 1702. Since the height of the first sealing ring 171 is less than the depth of the first mounting groove 1702, there is a gap above the first sealing ring 171, there is a gap between the first sealing ring 171 and the machine core shaft 15, there is a gap between the blocking ring 170 and the machine core shaft 15, and the gap 19 formed between the water spray seat 18 and the machine core shaft 15 together forms a channel, and the airflow carries the tooth powder from the channel into the patient's mouth. Since the inner diameter of the first sealing ring 171 is smaller than the inner diameter of the first mounting groove 1702, the first sealing ring 171 is closer to the machine core shaft 15 than the blocking ring 170, and the first sealing ring 171 can prevent the blocking ring 170 from rubbing against the high-speed rotating machine core shaft 15. At this time, the second sealing ring 172 contacts the outer ring of the bearing 14 to prevent the blocking ring 170 from rubbing against the bearing 14.

[0033] When the anti-suckback dental handpiece stops working, the interior of the handpiece 10 is under negative pressure, and the sealing ring 170 contracts radially under the negative pressure and fits with the machine core shaft 15. The gap between the sealing ring 170 and the machine core shaft 15 disappears, the passage is blocked, and oral fluid cannot enter the interior of the handpiece 10. At this time, the first sealing ring 171 moves radially along the machine core shaft 15 under the negative pressure and fits with the bearing 14. The gap above the first sealing ring 171 disappears, further preventing medical waste from entering the interior of the handpiece 10.

[0034] Through the above design, when negative pressure is formed inside the handpiece 10, the sealing ring 170 radially contracts and fits with the machine core shaft 15 to eliminate the gap, and the gap 19 is blocked by the sealing ring 170. Oral fluid cannot be sucked back into the handpiece 10 through the gap 19, thereby avoiding various damages to the handpiece 10 and the dental mobile phone, avoiding cross infection between patients, and also improving the energy conversion rate of air pressure.

[0035] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. An anti-suckback dental handpiece, comprising a handpiece, the handpiece comprising a turbine, a bearing, a water spray seat, a machine core shaft and a needle, the needle is mounted on the machine core shaft, the turbine, the bearing and the water spray seat are sequentially mounted on the machine core shaft, a gap is formed between the machine core shaft and the water spray seat, characterized in that: The anti-backsuck dental handpiece further comprises an anti-backsuck component, the anti-backsuck component comprises a blocking ring, the blocking ring is made of elastic material, the blocking ring is sleeved on the machine core shaft and forms a gap between the machine core shaft, the blocking ring is located between the bearing and the water spray seat, when negative pressure is formed inside the handpiece, the blocking ring radially contracts and fits with the machine core shaft to make the gap disappear, and the gap is blocked by the blocking ring; The sealing ring is provided with a first mounting groove, the first mounting groove extends to the inner wall of the sealing ring, the anti-backsucking assembly further comprises a first sealing ring, the first sealing ring is movably mounted in the first mounting groove; The depth of the first installation groove is greater than the height of the first sealing ring, and the first sealing ring can move axially along the movement axis in the first installation groove; The inner diameter of the first sealing ring is smaller than the inner diameter of the blocking ring, so as to prevent the core shaft from rubbing against the blocking ring when the anti-suckback dental handpiece is working; The sealing ring is provided with a second mounting groove, and the second mounting groove extends to the outer wall of the sealing ring. The anti-back-sucking assembly also includes a second sealing ring, and the second sealing ring is installed in the second mounting groove, and the second sealing ring is in conflict with the bearing.

2. The anti-suckback dental handpiece according to claim 1, characterized in that: The sealing ring is made of fluoroplastic.

3. The anti-suckback dental handpiece according to claim 1, characterized in that: The first sealing ring is a metal ring.

4. The anti-suckback dental handpiece according to claim 1, characterized in that: The second sealing ring is a metal ring.

5. The anti-suckback dental handpiece according to claim 1, characterized in that: The machine head also includes a shell and a cover body. The turbine, bearing, machine core shaft, anti-back-sucking assembly and water spray seat are accommodated in the shell, and the cover body is fixed to the top of the shell.

6. The anti-suckback dental handpiece according to claim 5, characterized in that: The shell is provided with an internal thread, and the cover is provided with an external thread. The external thread cooperates with the internal thread to fix the cover to the shell.

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