Novel dental turbine handpiece

Abstract

The invention discloses a novel dental turbine handpiece. The device comprises a shell, and a rotating shaft, a turbine, a connecting shaft cam, a disc, a connecting rod and a machine needle which are arranged in the shell, the machine needle, the disc, the connecting shaft cam and the rotating shaft are sequentially arranged from front to back, the machine needle is detachably installed on the disc, the connecting shaft cam mainly comprises a main shaft and a transmission shaft, the main shaft and the transmission shaft are eccentrically arranged and fixedly connected, the rotating shaft is sleeved outside the main shaft of the connecting shaft cam, and the turbine is sleeved outside the rotating shaft. The turbine is driven by airflow and drives the rotating shaft and a main shaft of the connecting shaft cam to synchronously rotate, and a transmission shaft of the connecting shaft cam is in transmission connection with the disc so as to drive the machine needle on the disc to do pendulum motion; the front end of the connecting rod is fixedly connected with the shell, the rear end of the connecting rod is movably connected with the disc, and the machine needle on the disc conducts pendulum type movement with the connecting position of the connecting rod on the disc as a fulcrum. The device helps to cut hard tissue of teeth and avoids damage to soft tissue of oral mucosa at the same time.

Description

Technical Field

[0001] The invention relates to the field of oral high-speed turbine mobile phones, in particular to a novel dental mobile phone. Background Art

[0002] At present, dental high-speed turbine handpieces are common treatment tools in the oral cavity, playing an important role in clinical operations such as tooth preparation, restoration and extraoral tooth extraction. However, during the operation, traditional high-speed turbine handpieces with rotation as the movement mode lack effective protection for oral soft tissues, making soft tissues including lips, buccal mucosa and lingual tissues vulnerable to damage during surgery, causing pain and discomfort to patients, and also affecting the accuracy and treatment effect of the surgery.

[0003] In clinical practice, there are many factors that can increase the risk of soft tissue injury. For example, the patient's oral structure may be very complex, especially when the teeth are positioned far back or the mouth opening is insufficient, and the maxillofacial anatomy of specific populations such as obese patients can affect the visibility and accuracy of the operation; children have poor compliance and are more likely to be uncooperative during treatment; in addition, improper operation by doctors and other factors can lead to the accidental occurrence of iatrogenic injuries.

[0004] Nowadays, although there are tools such as ultrasonic osteotome on the market, which can achieve precise cutting of hard tissues through high-frequency vibration or ultrasonic technology, while effectively protecting the surrounding soft tissues from damage. However, due to its high price and easy wear and tear, its further widespread application in clinical practice is limited. Overall, domestic and international research in the field of oral instruments is still blank, and the improvement of oral high-speed turbine mobile phones will be a vast blue ocean in this field. Summary of the invention

[0005] In order to solve the problem of soft tissue protection of traditional high-speed turbine handpieces, the present invention proposes a new dental turbine handpiece. The dental handpiece of the present invention changes the motion mode of the existing turbine handpiece from the traditional rotational motion to the reciprocating swinging mode, thereby achieving a selective cutting effect that can cut hard tissue (teeth) without damaging the soft tissue inside the oral cavity.

[0006] The present invention adopts the following technical solution:

[0007] The dental turbine handpiece comprises a housing and a rotating shaft, a turbine, a coupling cam, a disc, a connecting rod and a needle arranged in the housing. The needle, the disc, the coupling cam and the rotating shaft are arranged in sequence from front to back, and the needle is detachably mounted on the front side of the disc. The coupling cam is mainly composed of a main shaft and a transmission shaft, which are eccentrically arranged and fixedly connected. The main shaft of the coupling cam is tightly sleeved with a rotating shaft, and the rotating shaft is sleeved with a turbine. The turbine is driven by a high-speed airflow and drives the rotating shaft and the main shaft of the coupling cam to rotate synchronously. The transmission shaft of the coupling cam is connected to the disc in a transmission manner, thereby driving the needle on the disc to perform a pendulum-like motion on a plane perpendicular to the axis of the main shaft of the coupling cam. The front end of the connecting rod is fixedly connected to the front end surface of the housing, and the rear end of the connecting rod is movably connected to the disc, so that the needle performs a pendulum-like motion with the connection of the connecting rod on the disc as a fulcrum.

[0008] The dental mobile phone also includes a first sleeve, which is sleeved on the end of the connecting cam transmission shaft, and the end of the connecting cam transmission shaft is interference fit with the first sleeve. The first sleeve is slidably arranged in a strip groove opened on the disc, and the strip groove is opened through the disc. The strip groove is arranged along the radial straight line of the disc, and the geometric center of the strip groove is located at the center of the disc.

[0009] The dental handpiece further comprises a second sleeve, the rear end of the connecting rod is rotatably mounted inside the second sleeve, the second sleeve is embedded in a mounting groove provided on the front side surface of the disc, and the second sleeve is interference fit with the disc.

[0010] A curved groove is formed through the front end surface of the shell, and the front end of the needle extends out of the shell from the curved groove. The curved groove is in an arc shape, and the center of the arc is located at the center of the installation groove.

[0011] A needle mounting groove is provided on the front side surface of the disc, and the rear end of the needle is detachably embedded in the needle mounting groove.

[0012] The dental handpiece further comprises a first bearing and a second bearing; the first bearing and the second bearing are respectively arranged at intervals on the front side and the rear side of the turbine, the first bearing and the second bearing are both mounted on the outside of the rotating shaft, the rotating shaft is respectively interference fit with the first bearing and the second bearing, and the outer peripheries of the first bearing and the second bearing are both fixedly connected to the housing.

[0013] The maximum swing angle of the turning needle doing pendulum motion is 3° to 5°.

[0014] The dental handpiece further comprises a rear cover which is threadedly connected to the rear end of the housing.

[0015] A rolling bearing is installed on the rear cover, and the rolling bearing is sleeved on the outer periphery of the rear end of the rotating shaft, and the rotating shaft and the rolling bearing are interference fit.

[0016] A water outlet is provided on the front end surface of the shell, and the water outlet is used to discharge cooling water.

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention changes the movement mode of the existing turbine handpiece to achieve the ability to accurately cut hard tissues such as teeth during operation, while soft tissues can be pushed away during vibration due to their ductility and not be cut, thereby achieving a selective cutting effect that can cut hard tissues (teeth) without damaging soft tissues inside the oral cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded view of the internal structure of the dental handpiece of the present invention;

[0020] Figure 2 It is a three-dimensional schematic diagram of the internal structure of the dental handpiece of the present invention;

[0021] Figure 3 is a perspective view of the housing of the dental handpiece of the present invention;

[0022] Figure 4 It is a three-dimensional schematic diagram of a dental handpiece of the present invention;

[0023] Figure 5 It is a front view of the housing of the dental handpiece of the present invention (without the rear cover);

[0024] Figure 6 is a cross-sectional view of a dental handpiece of the present invention;

[0025] Figure 7 is a first cross-sectional view of a disc in a dental handpiece of the present invention;

[0026] Figure 8 is a second cross-sectional view of the disc in the dental handpiece of the present invention;

[0027] Fig. 9 It is a cross-sectional view of the coupling cam in the dental mobile phone of the present invention.

[0028] Among them, 1. rotating shaft, 2. first bearing, 3. turbine, 4. second bearing, 5. connecting cam, 6. first sleeve, 7. disc, 8. second sleeve, 9. connecting rod, 10. turning needle, 11. back cover, 12. curved groove, 13. water outlet, 14. mounting groove, 15. turning needle mounting groove, 16. strip groove. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The specific embodiments of the present invention are as follows:

[0031] like Figure 1 to Figure 6 As shown, the dental handpiece of the present invention comprises a housing and a rotating shaft 1, a turbine 3, a coupling cam 5, a disc 7, a connecting rod 9 and a needle 10 arranged in the housing.

[0032] The needle 10, the disc 7, the coupling cam 5 and the rotating shaft 1 are arranged in sequence from front to back. The needle 10 is detachably mounted on the front side of the disc 7. The coupling cam 5 is mainly composed of a main shaft and a transmission shaft. The main shaft and the transmission shaft are eccentrically arranged and fixedly connected. The main shaft of the coupling cam 5 is tightly sleeved with the rotating shaft 1 on the outside. The rotating shaft 1 is tightly sleeved with a turbine 3 on the outside. The turbine 3 is used to be driven by a high-speed airflow and drive the rotating shaft 1 and the main shaft of the coupling cam 5 to rotate synchronously. Specifically, a center hole is coaxially opened inside the rotating shaft 1 to accommodate the main shaft of the coupling cam 5. The main shaft of the coupling cam 5 is embedded in the center hole of the rotating shaft 1. Through the tight connection between the main shaft of the coupling cam 5 and the rotating shaft 1, the rotation of the turbine 3 is smoothly transmitted to the main shaft of the coupling cam 5 after passing through the rotating shaft 1.

[0033] Alternatively, if Fig. 9 As shown in the cross-sectional view in , the main shaft (right end of the cross-sectional view) and the transmission shaft (left end of the cross-sectional view) of the coupling cam 5 are fixedly connected via a connecting plate, and the main shaft and the transmission shaft are eccentrically arranged.

[0034] The transmission shaft of the coupling cam 5 is transmission-connected with the disc 7 , thereby driving the needle 10 on the disc 7 to perform pendulum-like motion on a plane perpendicular to the main shaft axis of the coupling cam 5 .

[0035] The front end of the connecting rod 9 is fixedly connected to the housing, and the rear end is movably connected to the disc 7, so that the needle 10 performs a pendulum-like motion with the connection point of the connecting rod 9 on the disc 7 as a fulcrum.

[0036] Furthermore, the dental handpiece further includes a first bearing 2 and a second bearing 4; the first bearing 2 and the second bearing 4 are used to fix the turbine 3, constrain the rotation of the shaft 1, and ensure the rotation accuracy of the shaft 1. The first bearing 2 and the second bearing 4 are arranged at intervals on the front side and the rear side of the turbine 3, respectively, the first bearing 2 and the second bearing 4 are both sleeved on the outside of the shaft 1, the shaft 1 is respectively interference-fitted with the first bearing 2 and the second bearing 4, and the outer peripheries of the first bearing 2 and the second bearing 4 are both fixedly connected to the housing.

[0037] In the above structure, the first bearing 2 and the second bearing 4 are used for axial limiting of the turbine 3. The outer periphery of the rotating shaft 1 cooperates with the center hole of the turbine 3, and the internal through hole of the rotating shaft 1 cooperates with the main shaft of the coupling cam 5, together forming the driving module of the dental mobile phone of the present invention. The driving process of the dental mobile phone of the present invention is: when the turbine 3 is powered by the outside, the turbine 3 itself rotates at a high speed (the rotating shaft is the center axis of the turbine 3). With the cooperation of the rotating shaft 1 and the center hole of the turbine 3, the rotating shaft 1 rotates together with the turbine 3; with the cooperation of the internal through hole of the rotating shaft 1 and the main shaft of the coupling cam 5, the coupling cam 5 also rotates around the center axis of the turbine 3, and finally the movement of the turbine 3 is transmitted to the coupling cam 5.

[0038] Specifically, the connecting rod 9 and the disc 7 are movably connected by the second sleeve 8, and the movement of the disc 7 is limited to rotation around the central axis of the connecting rod 9. The rear end of the connecting rod 9 is rotatably mounted inside the second sleeve 8, and the second sleeve 8 is embedded in the mounting groove 14 provided on the front side of the disc 7, and the second sleeve 8 and the disc 7 are interference fit.

[0039] Furthermore, a curved groove 12 is formed through the front end surface of the housing, and the front end of the needle 10 contacts the tooth after extending out of the curved groove 12. The curved groove 12 is in an arc shape, and the center of the arc is located at the geometric center of the mounting groove 14, so that the needle 10 can reciprocate between the two ends of the curved groove 12. The shape of the curved groove 12 can adapt to the movement trajectory of the needle 10, ensuring that the needle 10 can move smoothly without unnecessary collision with the housing.

[0040] Among them, Figure 2 As shown, the transmission connection between the transmission shaft of the coupling cam 5 and the disc 7 is specifically as follows: the dental handpiece also includes a first sleeve 6, the first sleeve 6 is sleeved on the end of the transmission shaft of the coupling cam 5, the end of the transmission shaft of the coupling cam 5 is interference fit with the first sleeve 6, the first sleeve 6 is slidably arranged in a strip groove 16 opened on the disc 7, the strip groove 16 is arranged along the radial straight line of the disc 7, and the geometric center of the strip groove 16 is located at the center of the disc 7, that is, the strip groove 16 takes the center of the disc 7 as its own geometric center.

[0041] The strip groove 16 is formed through the disc 7 to increase the stability of the turbine.

[0042] After the transmission shaft of the coupling cam 5 is sleeved with the first sleeve 6, a circular motion around the main shaft axis of the coupling cam 5 occurs in the strip groove 16 of the disc 7. The outer diameter of the first sleeve 6 is slightly smaller than the width of the strip groove 16, thereby achieving the effect of driving the disc 7 to move.

[0043] During the operation of the tooth cutting machine, the transmission shaft of the coupling cam 5 drives the first sleeve 6 to make a circular motion with the central axis of the turbine 3 (the main axis of the coupling cam 5) as the center, and the first sleeve 6 reciprocates in the strip groove 16, thereby driving the disc 7 to swing with a limited angle with the mounting groove 14 as the fulcrum. At the same time, the needle 10 detachably mounted on the disc 7 swings with the disc 7 synchronously with the disc 7. The needle thus achieves an ideal high-frequency swing within a certain angle, and the turbine speed (r / s) is equal to the needle swing frequency (Hz).

[0044] Specifically, the needle 10 is detachably mounted on the disc 7. A needle mounting groove 15 is provided on the front side of the disc 7. The rear end of the needle 10 is detachably mounted in the needle mounting groove 15. The rear end of the needle 10 is interference fit with the needle mounting groove 15.

[0045] Preferably, if Figure 8 As shown, the mounting groove 14 on the disc 7 is opened on the front side of the disc 7 and does not completely penetrate the disc 7.

[0046] Preferably, if Figure 8 As shown, the needle mounting groove 15 on the disc 7 passes through the disc 7 .

[0047] Preferably, if Figure 7 and Figure 8 As shown, the mounting groove 14 and the needle mounting groove 15 are both circular grooves.

[0048] Preferably, if Figure 7 and Figure 8 As shown, the mounting groove 14 , the strip groove 16 and the needle mounting groove 15 are arranged on the same radial straight line of the disk 7 , and the mounting groove 14 and the needle mounting groove 15 are symmetrically arranged relative to the center of the disk 7 .

[0049] Preferably, the maximum swing angle of the needle 10 is 3° to 5°. The maximum swing angle refers to the maximum angle formed between the two farthest points when the needle 10 performs a pendulum motion.

[0050] Furthermore, the dental handpiece further comprises a rear cover 11, which is threadedly connected to the rear end of the housing.

[0051] Furthermore, a rolling bearing is installed on the rear cover 11 , and the rolling bearing is sleeved on the outer periphery of the rear end of the rotating shaft 1 , and the rotating shaft 1 and the rolling bearing are interference fit.

[0052] Furthermore, if Figure 5 As shown, four water outlets 13 are provided on the front end surface of the housing, and the water outlets 13 are used to discharge cooling water.

[0053] Furthermore, a hollow pipe is provided inside the connecting rod 9 , and two ends of the hollow pipe are respectively connected to the cooling water pipe and the water outlet 13 .

[0054] The working process of the present invention is specifically as follows:

[0055] The turbine 3 rotates under the action of a power source (generally high-speed gas), and the main shaft of the coupling cam 5 also rotates through the transmission of the rotating shaft 1. The main shaft speed and direction of the coupling cam 5 should be the same as those of the turbine 3. The transmission shaft of the coupling cam 5 rotates with the main shaft and performs circular motion around the central axis of the turbine 3 (the main shaft of the coupling cam 5).

[0056] After the first sleeve 6 is put on the transmission shaft of the coupling cam 5, the first sleeve 6 reciprocates in the strip groove 16 at the center of the disc 7, converting the circular motion of the first sleeve 6 itself into the swing of the disc 7 with the mounting groove 14 (the projection of the central axis of the connecting rod 9 on the disc 7) as the fulcrum, thereby driving the needle 10 to perform a pendulum-like motion.

[0057] When the needle 10 contacts the patient's teeth, it can cut off the hard teeth. When the doctor accidentally contacts the needle 10 with the oral soft tissue, the back and forth swing of the needle 10 can achieve selective cutting without damaging the oral soft tissue with good ductility.

[0058] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A new type of dental turbine handpiece, Features: The invention comprises a housing and a rotating shaft (1), a turbine (3), a coupling cam (5), a disc (7), a connecting rod (9) and a needle (10) arranged in the housing; the needle (10), the disc (7), the coupling cam (5) and the rotating shaft (1) are arranged in sequence from front to back; the needle (10) is detachably mounted on the disc (7); the coupling cam (5) is mainly composed of a main shaft and a transmission shaft; the main shaft and the transmission shaft are eccentrically arranged and fixedly connected; the main shaft of the coupling cam (5) is sleeved with a rotating shaft (1); the outer surface of the rotating shaft (1) is The housing is provided with a turbine (3), the turbine (3) is driven by airflow and drives the rotating shaft (1) and the main shaft of the connecting cam (5) to rotate synchronously, the transmission shaft of the connecting cam (5) is connected to the disc (7), and then drives the needle (10) on the disc (7) to perform pendulum-like motion; the front end of the connecting rod (9) is fixedly connected to the housing, and the rear end of the connecting rod (9) is movably connected to the disc (7), so that the needle (10) performs pendulum-like motion with the connection point of the connecting rod (9) on the disc (7) as a fulcrum.

2. The new dental turbine handpiece according to claim 1, Features: The dental handpiece further comprises a first sleeve (6), wherein the first sleeve (6) is sleeved on the end of the transmission shaft of the coupling cam (5), the end of the transmission shaft of the coupling cam (5) is interference fit with the first sleeve (6), the first sleeve (6) is slidably arranged in the strip groove (16) on the disc (7), the strip groove (16) is penetrated through and opened on the disc (7), the strip groove (16) is arranged along the radial straight line of the disc (7), and the geometric center of the strip groove (16) is located at the center of the disc (7).

3. The new dental turbine handpiece according to claim 1, Features: The dental handpiece further comprises a second sleeve (8), the rear end of the connecting rod (9) being rotatably mounted inside the second sleeve (8), the second sleeve (8) being embedded in a mounting groove (14) provided on the disc (7), and the second sleeve (8) and the disc (7) being interference fit.

4. The new dental turbine handpiece according to claim 3, Features: A curved groove (12) is provided through the front end surface of the shell, and the front end of the needle (10) extends out of the shell from the curved groove (12). The curved groove (12) is in an arc shape, and the center of the arc shape is located at the mounting groove (14).

5. The new dental turbine handpiece according to claim 1, Features: A needle mounting groove (15) is provided on the front side of the disc (7), and the rear end of the needle (10) is detachably embedded in the needle mounting groove (15).

6. The new dental turbine handpiece according to claim 1, Features: The dental handpiece further comprises a first bearing (2) and a second bearing (4); the first bearing (2) and the second bearing (4) are respectively arranged on the front side and the rear side of the turbine (3); the first bearing (2) and the second bearing (4) are both mounted on the outside of the rotating shaft (1); the rotating shaft (1) is respectively interference fit with the first bearing (2) and the second bearing (4); the first bearing (2) and the second bearing (4) are both fixedly connected to the housing.

7. The new dental turbine handpiece according to claim 1, Features: The maximum swing angle of the turning needle (10) is 3° to 5°.

8. The new dental turbine handpiece according to claim 1, Features: The dental handpiece further comprises a rear cover (11), and the rear cover (11) is threadedly connected to the rear end of the shell.

9. The new dental turbine handpiece according to claim 8, Features: A rolling bearing is installed on the rear cover (11), and the rolling bearing is sleeved on the outer periphery of the rear end of the rotating shaft (1), and the rotating shaft (1) and the rolling bearing are interference fit.

10. The new dental turbine handpiece according to claim 1, Features: A water outlet (13) is provided on the front end surface of the shell, and the water outlet (13) is used to discharge cooling water.

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