Novel dental turbine handpiece

Abstract

The utility model 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 dental forceps help to cut hard tissue of teeth and avoid damage to soft tissue of oral mucosa at the same time.

Description

Technical Field

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

[0002] Currently, dental high-speed turbine handpieces are common therapeutic tools in the oral cavity, playing an important role in clinical procedures such as tooth preparation, restoration, and extraoral tooth extraction. However, during operation, traditional high-speed turbine handpieces, which use a rotational motion mode, lack effective protection for oral soft tissues. This makes soft tissues, including the lips, buccal mucosa, and lingual tissue, susceptible to damage during surgery, causing pain and discomfort to patients while also compromising surgical precision and therapeutic effectiveness.

[0003] In clinical practice, many factors 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 is not fully opened. The maxillofacial anatomy of specific populations, such as obese patients, can affect the visibility and accuracy of the operation. Children have poor patient compliance and are more likely to be uncooperative during treatment. In addition, improper operation by the doctor can lead to the accidental occurrence of iatrogenic injury.

[0004] While tools such as ultrasonic osteotome have emerged on the market, using high-frequency vibration or ultrasonic technology to precisely cut hard tissue while effectively protecting surrounding soft tissue from damage, their high cost and high wear and tear have limited their widespread clinical application. Overall, research in this area of ​​oral devices remains underdeveloped, both domestically and internationally, and improvements to high-speed turbine handpieces represent a promising area of ​​research. Utility Model Content

[0005] To address the soft tissue protection issues associated with conventional high-speed turbine handpieces, this utility model proposes a new dental turbine handpiece. By changing the motion mode of conventional turbine handpieces from traditional rotary motion to a reciprocating oscillating motion, this new dental handpiece achieves a selective cutting effect that can cut hard tissue (teeth) without damaging soft tissue within the oral cavity.

[0006] The utility model adopts the following technical solutions:

[0007] The dental turbine handpiece includes a housing, a rotating shaft, a turbine, a coupling cam, a disc, a connecting rod, and a burr arranged within the housing. The burr, disc, coupling cam, and rotating shaft are arranged sequentially from front to back, with the burr being removably mounted on the front side of the disc. The coupling cam primarily comprises a main shaft and a transmission shaft, which are eccentrically arranged and fixedly connected. The rotating shaft of the coupling cam is tightly fitted around the exterior of the main shaft, which is also fitted with a turbine. The turbine is driven by 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 in transmission connection with the disc, thereby driving the burr on the disc to perform a pendulum-like motion in 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, while the rear end of the connecting rod is movably connected to the disc, causing the burr to perform a pendulum-like motion with the connection point of the connecting rod on the disc as a fulcrum.

[0008] The dental handpiece also includes a first sleeve, which is sleeved on the end of the connecting cam transmission shaft. 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. The strip groove is opened through the disc. The strip groove is arranged along the radial straight line of the disc. 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 portion 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 portion 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 portion of the needle is detachably embedded in the needle mounting groove.

[0012] The dental handpiece further includes 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 interference fit with the first bearing and the second bearing respectively, 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 when performing 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 shell.

[0015] A rolling bearing is installed on the rear cover. The rolling bearing is sleeved on the outer periphery of the rear end portion of the rotating shaft. 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 utility model are as follows:

[0018] The utility model changes the motion mode of the existing turbine handpiece, thereby achieving 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 This 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 utility model;

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

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

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

[0024] Figure 6 It is a cross-sectional view of the dental mobile phone of the present utility model;

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

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

[0027] Figure 9 It is a cross-sectional view of a connecting cam in a dental handpiece 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 will be described in further detail below with reference to the accompanying drawings and specific embodiments.

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

[0031] like Figures 1 to 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 bur 10 arranged in the housing.

[0032] The needle 10, disc 7, coupling cam 5, and 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 external part of the main shaft of the coupling cam 5 is tightly fitted with the rotating shaft 1. The external part of the rotating shaft 1 is tightly fitted with a turbine 3. The turbine 3 is driven by a high-speed airflow and drives 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, as Figure 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 in transmission connection with the disc 7 , thereby driving the needle 10 on the disc 7 to perform pendulum 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] The dental handpiece further includes a first bearing 2 and a second bearing 4. The first and second bearings 2 and 4 are used to secure the turbine 3, constrain the rotation of the shaft 1, and ensure the rotational accuracy of the shaft 1. The first and second bearings 2 and 4 are spaced apart on the front and rear sides of the turbine 3, respectively. The first and second bearings 2 and 4 are each mounted on the exterior of the shaft 1. The shaft 1 is interference-fitted with the first and second bearings 2 and 4, respectively. The outer peripheries of the first and second bearings 2 and 4 are fixedly connected to the housing.

[0037] In the above structure, the first bearing 2 and the second bearing 4 are used for axial limitation 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 as follows: when the turbine 3 is powered by the outside, the turbine 3 itself rotates at 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, finally realizing the transmission of the movement of the turbine 3 to the coupling cam 5.

[0038] The movable connection between connecting rod 9 and disk 7 is specifically as follows: disk 7 and connecting rod 9 are movably connected via second sleeve 8, and the movement of disk 7 is restricted to rotation about the central axis of connecting rod 9. The rear end of connecting rod 9 is rotatably mounted within second sleeve 8, which is inserted into mounting groove 14 defined in the front side of disk 7, forming an interference fit between second sleeve 8 and disk 7.

[0039] Furthermore, a curved groove 12 is formed through the front surface of the housing. The front end of the needle 10 extends out of the curved groove 12 and contacts the tooth. The curved groove 12 is arc-shaped, with the center of the arc located at the geometric center of the mounting groove 14, allowing the needle 10 to 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 smooth movement of the needle 10 and preventing 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, which is sleeved on the end of the transmission shaft of the coupling cam 5, and 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 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 first sleeve 6 is put on the transmission shaft of the coupling cam 5, 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, achieving the effect of driving the disc 7 to move.

[0043] During operation, the drive shaft of the coupling cam 5 drives the first sleeve 6 in circular motion about the central axis of the turbine 3 (the main axis of the coupling cam 5). The first sleeve 6 reciprocates within the strip groove 16, in turn driving the disc 7 to swing through a limited angle around the mounting groove 14. Simultaneously, the needle 10, removably mounted on the disc 7, swings synchronously with the disc 7 through a limited angle. This achieves the desired high-frequency swing within a certain angle. The turbine speed (r / s) is equal to the needle's swing frequency (Hz).

[0044] The needle 10 is detachably mounted on the disc 7. Specifically, a needle mounting groove 15 is formed 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 end points when the needle 10 performs a pendulum-like 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 portion of the rotating shaft 1 , and the rotating shaft 1 and the rolling bearing are interference fit.

[0052] Further, if Figure 5 As shown, four water outlets 13 are provided on the front face 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 both ends of the hollow pipe are respectively connected to the cooling water pipe and the water outlet 13 .

[0054] The working process of this utility model is specifically as follows:

[0055] The turbine 3 rotates under the action of the power source (generally high-speed gas), and the main shaft of the coupling cam 5 is also rotated through the transmission of the rotating shaft 1. The speed and direction of the main shaft 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 connecting cam 5, the first sleeve 6 moves back and forth in the strip groove 16 in 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 bur 10 contacts the patient's teeth, it can cut off the hard teeth. When the doctor accidentally contacts the bur 10 with the oral soft tissue, the bur 10 swings back and forth, which plays a selective cutting role and will not damage the oral soft tissue with good ductility.

[0058] The above specific implementation methods are used to illustrate the present invention rather than to limit the present invention. Any modifications and changes 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, characterized by: 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 provided with a rotating shaft (1), and the outer surface of the rotating shaft (1) is provided with a rotating shaft (1). The housing is provided with a turbine (3), which 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) in a transmission manner, thereby driving the needle (10) on the disc (7) to perform a 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 a 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 is characterized in that: The dental turbine handpiece further comprises a first sleeve (6), the first sleeve (6) being sleeved on the end of the transmission shaft of the coupling cam (5), the end of the transmission shaft of the coupling cam (5) being interference fit with the first sleeve (6), the first sleeve (6) being slidingly arranged in the strip groove (16) on the disc (7), the strip groove (16) being opened through the disc (7), the strip groove (16) being arranged along the radial straight line of the disc (7), and the geometric center of the strip groove (16) being located at the center of the disc (7).

3. The new dental turbine handpiece according to claim 1 is characterized in that: The dental turbine handpiece further comprises a second sleeve (8), the rear end portion 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 is characterized in that: 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 is characterized in that: A turning needle mounting groove (15) is provided on the front side surface of the disc (7), and the rear end portion of the turning needle (10) is detachably embedded in the turning needle mounting groove (15).

6. The new dental turbine handpiece according to claim 1 is characterized in that: The dental turbine 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 sleeved on the outside of the rotating shaft (1); the rotating shaft (1) is interference-fitted with the first bearing (2) and the second bearing (4) respectively; 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 is characterized in that: The maximum swing angle of the turning needle (10) is 3° to 5°.

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

9. The new dental turbine handpiece according to claim 8, characterized in that: A rolling bearing is installed on the rear cover (11), and the rolling bearing is sleeved on the outer periphery of the rear end portion 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 is characterized in that: 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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