Dental contra-angle handpiece and dental contra-angle handpiece

Abstract

The application discloses a dental bending handpiece head and a dental bending handpiece. The dental bending handpiece head comprises a head structure, a clamping needle tube body and a sealing element. The sealing element is arranged between the gap between the working port of the head structure and the clamping needle tube body, and the clamping needle tube body is arranged in the through hole of the sealing element. The sealing part is arranged at the edge of the through hole of the sealing element, the sealing part is in contact with the outer wall of the clamping needle tube body, the working port of the head structure is sealed, and the design position of the parting line of the sealing element is located at the position of the sealing part on the sealing element. The dental bending handpiece head and the dental bending handpiece can improve the sealing effect of the sealing element on the dental bending handpiece head, so that the internal devices of the dental bending handpiece are less affected by corrosion.

Description

Technical Field

[0001] This invention relates to the field of dental medical device technology, and in particular to a dental curved handpiece head and a dental curved handpiece. Background Technology

[0002] Currently, dental handpieces use clamped burs to perform dental procedures such as tooth treatment, restoration, and oral surgery. A sealing element is installed in the gap at the front of the handpiece head to prevent blood or other liquids from entering the machine and causing corrosion to internal components.

[0003] However, in practical applications, the parting line of the sealing element is located at the mating edge of its inner hole. After manual processing, the parting line of the sealing element may have burrs, defects, cracks, etc., which will reduce the sealing effect of the sealing element and make the internal components of the dental handpiece more susceptible to corrosion. Therefore, how to improve the sealing effect of the sealing element on the dental handpiece to reduce the impact of corrosion on the internal components of the dental handpiece has become an urgent problem to be solved. Summary of the Invention

[0004] This invention discloses a dental curved handpiece head and a dental curved handpiece, which can improve the sealing effect of the sealing element on the dental curved handpiece head, thereby reducing the impact of corrosion on the internal components of the dental curved handpiece.

[0005] To achieve the above objectives, in a first aspect, the present invention discloses a needle clamping structure, wherein the dental curved handpiece head includes:

[0006] A head structure, wherein the head structure has a working cavity and a working port communicating with the working cavity;

[0007] The needle clamping tube is disposed in the working chamber through the working port, and the interior of the needle clamping tube is used to clamp the dental bur to be used; wherein, the machine head structure is used to control the needle clamping tube to rotate about the central axis of the working chamber, so as to drive the dental bur to rotate.

[0008] A sealing element having a through hole is disposed in the gap between the working port of the machine head structure and the needle clamping tube body, and the needle clamping tube body passes through the through hole of the sealing element. The edge of the through hole of the sealing element is provided with a sealing part, which contacts the outer wall of the needle clamping tube body to seal the working port. The mold parting line of the sealing element is designed to be located on the sealing element at a position other than the sealing part.

[0009] As an optional implementation, in an embodiment of the first aspect of the present invention, the sealing element further includes a mold closing portion, which is disposed on either side of the sealing element in the axial direction. There is a gap between the mold closing portion and the clamping needle tube body. The mold closing line of the sealing element is designed to be located on the inner edge of the mold closing portion facing the outside of the working cavity or on the inner edge of the mold closing portion facing the inside of the working cavity.

[0010] As an optional implementation, in an embodiment of the first aspect of the present invention, the sealing element is made of a soft material or an elastic material, and the width of the portion of the sealing element used to seal the gap is designed to be greater than the gap width between the working port of the head structure and the needle clamp tube body.

[0011] As an optional implementation, in an embodiment of the first aspect of the present invention, the sealing part is designed with an arc-shaped cross-section, and the arc of the sealing part is disposed toward the center of the through hole of the sealing element.

[0012] As an optional implementation, in an embodiment of the first aspect of the present invention, the needle clamping tube has a needle clamping spring for clamping the dental bur inside the needle clamping tube.

[0013] As an optional implementation, in an embodiment of the first aspect of the present invention, the head unit structure includes:

[0014] A rotation control assembly is provided, the connecting end of which is sleeved on the outer wall of the needle clamping spring. The rotation control assembly is used to control the needle clamping tube to rotate about the central axis of the working chamber, so as to drive the dental bur to rotate.

[0015] The head housing has a working cavity and a working port and a rear cover opening communicating with the working cavity. The working port and the rear cover opening are arranged opposite to each other. The rotation control component and the needle clamping tube are both disposed in the working cavity.

[0016] A rear cover assembly is disposed at the rear cover opening of the head housing to close the rear cover opening.

[0017] As an optional implementation, in an embodiment of the first aspect of the present invention, the rotation control component includes:

[0018] The shaft is sleeved on the outer wall of the needle clamping spring. The shaft is the connecting end of the rotation control assembly. The shaft is used to control the needle clamping tube to rotate about the central axis of the working chamber, so as to drive the dental bur to rotate.

[0019] A bearing assembly is sleeved on the outer wall of the shaft core, and the bearing assembly is used to support the shaft core to rotate.

[0020] As an optional implementation, in an embodiment of the first aspect of the present invention, the bearing device includes:

[0021] A first bearing is disposed between the shaft core and the machine head housing, and the inner wall of the first bearing is in contact with the outer wall of the shaft core.

[0022] A second bearing is disposed between the shaft core and the rear cover assembly, and the inner wall of the second bearing is in contact with the outer wall of the shaft core.

[0023] Both the first bearing and the second bearing are used to support the rotation of the shaft core.

[0024] As an optional implementation, in an embodiment of the first aspect of the invention, the rear cover assembly is provided with a pressing extension on one side, the rear cover assembly being used to open the needle clamping spring through its pressing extension so that the needle clamping tube body releases its grip on the dental bur.

[0025] In a second aspect, the present invention discloses a dental handpiece, comprising:

[0026] The phone body is bent.

[0027] The dental curved handpiece head as described in the first aspect of the present invention is mounted on the curved handpiece body.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The dental curved handpiece head provided by this invention seals the working opening of the handpiece structure by setting a sealing part at the edge of the through hole of the sealing element. The sealing part contacts the outer wall of the needle clamping tube. The parting line of the sealing element is designed to be located at the non-sealing part of the sealing element, thereby avoiding the sealing effect of the sealing element when there are burrs, defects, cracks or other phenomena on the parting line of the sealing element. This improves the sealing effect of the sealing element on the dental curved handpiece head and reduces the impact of corrosion on the internal components of the dental curved handpiece.

[0030] The dental curved handpiece provided by this invention uses the aforementioned dental curved handpiece head. By setting a sealing part at the edge of the through hole of the sealing element, the sealing part contacts the outer wall of the needle clamping tube to seal the working port of the handpiece head structure. Furthermore, the parting line of the sealing element is designed to be located at the non-sealing part of the sealing element, thereby avoiding the sealing effect of the sealing element when there are burrs, defects, cracks, etc. on the parting line of the sealing element. This improves the sealing effect of the sealing element on the dental curved handpiece head and reduces the impact of corrosion on the internal components of the dental curved handpiece. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a dental curved handpiece head according to a specific embodiment of the present invention;

[0032] Figure 2 This is a cross-sectional view of a sealing element according to a specific embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of a sealing element according to a specific embodiment of the present invention;

[0034] Figure 4 This is a cross-sectional view of a sealing element according to another specific embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the sealing element according to another specific embodiment of the present invention;

[0036] Figure 6 This is a cross-sectional view of a dental handpiece head according to a specific embodiment of the present invention.

[0037] The meanings of the reference numerals in the attached figures are as follows:

[0038] The machine head structure 100, rotation control assembly 110, shaft core 111, bearing device 112, first bearing 1121, second bearing 1122, machine head housing 120, rear cover assembly 130, pressing extension 131, needle clamping tube 200, needle clamping spring 210, sealing element 300, sealing part 310, and mold closing part 320. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0041] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0042] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0043] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0044] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0045] Currently, dental handpieces use clamped burs to perform dental procedures such as tooth treatment, restoration, and oral surgery. A sealing element is installed in the gap at the front of the handpiece head to prevent blood or other liquids from entering the machine and causing corrosion to internal components.

[0046] However, in practical applications, the parting line of the sealing element is located at the mating edge of its inner hole. After manual processing, the parting line of the sealing element may have burrs, defects, cracks, etc., which will reduce the sealing effect of the sealing element and make the internal components of the dental handpiece more susceptible to corrosion. Therefore, how to improve the sealing effect of the sealing element on the dental handpiece to reduce the impact of corrosion on the internal components of the dental handpiece has become an urgent problem to be solved.

[0047] In response, this invention discloses a dental curved handpiece head and a dental curved handpiece, which can improve the sealing effect of the sealing element on the dental curved handpiece head, thereby reducing the impact of corrosion on the internal components of the dental curved handpiece.

[0048] like Figure 1 As shown, the present invention discloses a dental curved handpiece head, which includes: a handpiece structure 100, a needle clamping tube body 200, and a sealing element 300. The head structure 100 has a working chamber and a working port communicating with the working chamber; the needle clamping tube 200 is disposed in the working chamber through the working port, and the interior of the needle clamping tube 200 is used to clamp the dental bur to be used; wherein, the head structure 100 is used to control the needle clamping tube 200 to rotate about the central axis of the working chamber, so as to drive the dental bur to rotate; the sealing element 300 has a through hole, the sealing element 300 is disposed in the gap between the working port of the head structure 100 and the needle clamping tube 200, and the needle clamping tube 200 passes through the through hole of the sealing element 300, and the edge of the through hole of the sealing element 300 is provided with a sealing part 310, which contacts the outer wall of the needle clamping tube 200 to seal the working port; wherein, the parting line of the sealing element 300 is designed to be located at the position of the non-sealing part 310 on the sealing element 300.

[0049] In this embodiment, refer to Figure 1 The head structure 100 has a working cavity inside, and a working port communicating with the working cavity is opened at the lower end of the head structure 100. The needle clamping tube 200 is a tubular object, and the needle clamping tube 200 has a cavity opened in the vertical direction inside, and both the upper and lower ends of the needle clamping tube 200 are provided with openings.

[0050] The needle clamping tube 200 is disposed within the working cavity of the head structure 100, and is coaxially arranged with the working cavity. A section of the lower end of the needle clamping tube 200 extends out of the working port of the head structure 100. A dental bur to be used is inserted into the inner cavity of the needle clamping tube 200 through the opening at the lower end, and is clamped and fixed by the needle clamping tube 200. The head structure 100 can control the needle clamping tube 200 to rotate about the central axis of the working cavity, thereby causing the dental bur held by the needle clamping tube 200 to rotate as well, thus using the rotating bur to perform related dental procedures.

[0051] The sealing element 300 is an annular sealing object with a through hole at its center. The sealing element 300 is positioned in the gap between the working port of the machine head structure 100 and the needle clamping tube 200. A section of the lower end of the needle clamping tube 200 extends outward from the through hole of the sealing element 300. A sealing portion 310 is provided on the edge of the through hole of the sealing element 300. The sealing portion 310 contacts the outer wall of the needle clamping tube 200 to seal the working port of the machine head structure 100. Simultaneously, the parting line of the sealing element 300 can be located at any position on the sealing element 300 except for the sealing portion 310. Because the parting line is misaligned with the sealing portion 310 used to mate with the needle clamping tube 200, the sealing effect of the sealing element 300 will not be affected when burrs, defects, or cracks appear on the parting line.

[0052] As can be seen, the dental curved handpiece head of the present invention provides a sealing part 310 at the edge of the through hole of the sealing element 300. The sealing part 310 contacts the outer wall of the needle clamping tube body 200 to seal the working port of the handpiece head structure 100. The parting line of the sealing element 300 is designed to be located at the position of the non-sealing part 310 on the sealing element 300. This avoids the sealing effect of the sealing element 300 being affected by burrs, defects, cracks, etc. on the parting line of the sealing element 300. This improves the sealing effect of the sealing element 300 on the dental curved handpiece head and reduces the impact of corrosion on the internal components of the dental curved handpiece.

[0053] like Figure 2 and Figure 3 As shown, in an optional embodiment, the sealing element 300 is further provided with a mold closing part 320, which is disposed on either side of the sealing element 300 in the axial direction. There is a gap between the mold closing part 320 and the needle clamping tube body 200. The mold closing line of the sealing element 300 is designed to be located on the inner edge of the mold closing part 320 facing the outside of the working cavity or on the inner edge of the mold closing part 320 facing the inside of the working cavity.

[0054] In this optional embodiment, the mold-closing portion 320 can be disposed above or below the sealing element 300, that is, above or below the sealing portion 310. The transverse width of the cross-section of the sealing portion 310 is greater than the transverse width of the cross-section of the mold-closing portion 320, and the mold-closing portion 320 does not contact the clamping needle tube body 200. Since the sealing element 300 is an annular object, its mold-closing line O is designed to be annular.

[0055] In one specific embodiment, refer to Figure 2 and Figure 3The mold-closing portion 320 can be disposed below the sealing element 300, that is, below the sealing portion 310. The design position of the mold-closing line O is located in the mold-closing portion 320 below the sealing portion 310, specifically on the edge between the inner ring wall of the mold-closing portion 320 and the lower side surface of the mold-closing portion 320. In another specific embodiment, refer to... Figure 4 and Figure 5 The mold closing part 320 can be disposed on the upper side of the sealing element 300, that is, above the sealing part 310. The mold closing line O is designed to be located on the mold closing part 320 above the sealing part 310, specifically on the edge between the inner ring wall of the mold closing part 320 and the upper side surface of the mold closing part 320.

[0056] Since the mold closing part 320 does not contact the clamping needle tube body 200, the sealing effect of the sealing element 300 will not be affected when there are burrs, defects, cracks or other phenomena on the mold closing line provided on the mold closing part 320.

[0057] As can be seen, this optional embodiment can also prevent the parting line from contacting the parting line by providing a mold part 320 on the sealing element 300 that is spaced apart from the needle clamping tube body 200. When the parting line has burrs, defects, cracks, or other phenomena, the sealing effect of the sealing element 300 will not be affected, thereby improving the sealing effect of the sealing element 300 on the dental curved handpiece head.

[0058] In an optional embodiment, the sealing element 300 is made of a soft or elastic material, and the width of the portion of the sealing element 300 used to seal the gap is designed to be greater than the gap width between the working port of the head structure 100 and the needle clamp tube body 200.

[0059] In this optional embodiment, a soft or elastic material is used as the constituent material of the sealing element 300, meaning the sealing element 300 has elastic compressibility. The width design value of the portion of the sealing element 300 used for sealing the gap is greater than the gap width between the working port of the head structure 100 and the needle clamping tube 200. When the sealing element 300 is installed between the working port and the needle clamping tube 200, due to the elastic compressibility of the sealing element 300, the sealing portion 310 of the sealing element 300 can be compressed, applying a pre-tightening force to the needle clamping tube 200, thereby further improving the sealing effect of the sealing element 300. It is understood that the width design value of the portion of the sealing element 300 used for sealing the gap can be adaptively adjusted according to the actual required sealing effect.

[0060] like Figure 2 and Figure 4 As shown, in an optional embodiment, the sealing portion 310 is designed with an arc-shaped cross-section, and the arc of the sealing portion 310 is oriented toward the center of the through hole of the sealing element 300.

[0061] In this optional embodiment, refer to Figure 2 and Figure 4 The sealing part 310 has a cross-sectional shape that is an arc facing the center of the through hole, meaning that the inner edge of the through hole of the sealing part 310 is arc-shaped. The arc design of the sealing part 310 makes it easier to install the sealing element 300 between the working port and the needle clamp tube 200. Furthermore, when the sealing part 310 of the sealing element 300 is compressed, it will not affect the pre-tightening force applied to the needle clamp tube 200, thus ensuring the sealing effect of the sealing element 300.

[0062] like Figure 6 As shown, in an optional embodiment, the needle clamping tube 200 has a needle clamping spring 210 for clamping dental burs inside the needle clamping tube 200.

[0063] In this optional embodiment, refer to Figure 6 The upper end of the needle clamping tube 200 has a needle clamping spring 210. When the dental bur is inserted into the inner cavity of the needle clamping tube 200 through the opening at the lower end of the needle clamping tube 200, the dental bur first opens the needle clamping spring 210 through the snap A. When the dental bur is fully inserted into the inner cavity of the needle clamping tube 200, the needle clamping spring 210 engages with the groove on the dental bur through its snap A, so that the dental bur can be clamped inside the needle clamping tube 200.

[0064] As can be seen, this optional embodiment can also clamp the dental bur using the clamping spring 210 on the clamping tube 200, thereby improving the stability of clamping the dental bur.

[0065] like Figure 6 As shown, in an optional embodiment, the head structure 100 includes: a rotation control assembly 110, a head housing 120, and a rear cover assembly 130. The connecting end of the rotation control assembly 110 is sleeved on the outer wall of the needle clamp spring 210. The rotation control assembly 110 is used to control the needle clamp tube 200 to rotate about the central axis of the working cavity, so as to drive the dental bur to rotate. The head housing 120 has a working cavity and a working port and a rear cover port communicating with the working cavity. The working port and the rear cover port are arranged opposite to each other. The rotation control assembly 110 and the needle clamp tube 200 are both disposed in the working cavity. The rear cover assembly 130 is disposed at the rear cover port of the head housing 120 to close the rear cover port.

[0066] In this optional embodiment, refer to Figure 6The cavity inside the head housing 120 is the working cavity of the head structure 100. The lower end of the head housing 120 has a working port communicating with the working cavity, and the upper end of the head housing 120 has a rear cover opening communicating with the working cavity. The rear cover assembly 130 is located at the rear cover opening at the upper end of the head housing 120 to close the rear cover opening.

[0067] The working cavity of the head housing 120 houses a rotation control component 110 and a needle clamping tube 200. The rotation control component 110 is sleeved on the outer wall of the needle clamping spring 210 through its connecting end. The rotation control component 110 controls its connecting end to drive the needle clamping tube 200 to rotate around the central axis of the working cavity, thereby driving the dental bur held by the needle clamping tube 200 to rotate together, so as to use the rotating bur to perform related dental surgery.

[0068] As can be seen, this optional embodiment can also accommodate the rotation control component 110 and the needle clamping tube 200 through the head housing 120, and control the rotation control component 110 to drive the dental bur to rotate together with the needle clamping spring 210, thereby realizing the use of the rotating bur to perform dental surgery.

[0069] like Figure 6 As shown, in an optional embodiment, the rotation control assembly 110 includes a shaft core 111 and a bearing device 112. The shaft core 111 is sleeved on the outer wall of the needle clamp spring 210, and the shaft core 111 is the connecting end of the rotation control assembly 110. The shaft core 111 is used to control the rotation of the needle clamp tube 200 around the central axis of the working cavity, so as to drive the dental bur to rotate. The bearing device 112 is sleeved on the outer wall of the shaft core 111, and the bearing device 112 is used to support the rotation of the shaft core 111.

[0070] In this optional embodiment, refer to Figure 6 The shaft core 111 has a cavity extending vertically. The shaft core 111, through this cavity, can be fitted onto the outer wall of the needle clamping tube 200, with the inner wall of the cavity of the shaft core 111 contacting the outer wall of the needle clamping tube 200, thereby fixing the needle clamping tube 200 within the cavity of the shaft core 111. It is understood that the outer wall of the needle clamping tube 200 may have a threaded portion to improve the stability of the shaft core 111 in fixing the needle clamping tube 200. The shaft core 111 controls the rotation of the needle clamping tube 200 around the central axis of the working cavity, thereby causing the dental bur held by the needle clamping tube 200 to rotate as well, thus using the rotating bur to perform related dental procedures.

[0071] The bearing device 112 is disposed between the shaft core 111 and the machine head housing 120 and between the shaft core 111 and the rear cover assembly 130, that is, the bearing device 112 is sleeved on the outer wall of the shaft core 111. The bearing device 112 can support the rotational movement of the shaft core 111 and reduce the coefficient of friction during its movement, thereby ensuring the rotational accuracy of the shaft core 111.

[0072] As can be seen, this optional embodiment can also control the rotation of the needle clamp spring 210 through the shaft core 111, thereby driving the dental bur to rotate together, and the rotational movement of the shaft core 111 can be supported by the bearing device 112, thereby ensuring the rotational accuracy of the shaft core 111.

[0073] like Figure 6 As shown, in an optional embodiment, the bearing assembly 112 includes a first bearing 1121 and a second bearing 1122. The first bearing 1121 is disposed between the shaft core 111 and the head housing 120, and the inner wall of the first bearing 1121 contacts the outer wall of the shaft core 111; the second bearing 1122 is disposed between the shaft core 111 and the rear cover assembly 130, and the inner wall of the second bearing 1122 contacts the outer wall of the shaft core 111; wherein, both the first bearing 1121 and the second bearing 1122 are used to support the shaft core 111 to rotate.

[0074] In this optional embodiment, the bearing assembly 112 is divided into a first bearing 1121 and a second bearing 1122. The first bearing 1121 is provided between the shaft core 111 and the machine head housing 120, and the second bearing 1122 is provided between the shaft core 111 and the rear cover assembly 130. The outer wall of the shaft core 111 is in contact with the inner wall of the first bearing 1121 and the inner wall of the second bearing 1122, respectively. The first bearing 1121 and the second bearing 1122 can support the rotational movement of the shaft core 111, thereby further reducing the coefficient of friction during the rotational movement of the shaft core 111, thus ensuring the rotational accuracy of the shaft core 111.

[0075] As can be seen, this optional embodiment can also support the rotational movement of the shaft core 111 by setting the first bearing 1121 and the second bearing 1122, thereby further reducing the coefficient of friction during the rotational movement of the shaft core 111 and further ensuring the rotational accuracy of the shaft core 111.

[0076] like Figure 6 As shown, in an optional embodiment, a pressing extension 131 is provided on one side of the rear cover assembly 130, which is used to open the needle clamp spring 210 through its pressing extension 131 so that the needle clamp tube 200 releases its grip on the dental bur.

[0077] In this optional embodiment, refer to Figure 6The lower side of the back cover assembly 130 is provided with a pressing extension 131, the lower end of which is designed with a rounded edge. The upper end of the needle clamp spring 210 is a curved structure that opens to the left and right. When the back cover assembly 130 is pressed down, the pressing extension 131 contacts the curved structure at the upper end of the needle clamp spring 210. As the back cover assembly 130 continues to be pressed down, the pressing extension 131 can open the needle clamp spring 210 through the curved structure, thereby releasing the clamping of the dental bur by the needle clamp tube 200.

[0078] As can be seen, this optional embodiment can also control the clamping of the dental bur by the needle clamping tube 200 through the pressing extension 131 provided on the rear cover assembly 130, thereby improving the controllability of the dental bur clamping.

[0079] The present invention also discloses a dental curved handpiece, which includes a curved handpiece body and a dental curved handpiece head as described in the above embodiments of the present invention, wherein the dental curved handpiece head is mounted on the curved handpiece body.

[0080] As can be seen, in this embodiment, the dental curved handpiece uses the aforementioned dental curved handpiece head. By providing a sealing part 310 at the edge of the through hole of the sealing element 300, the sealing part 310 contacts the outer wall of the needle clamping tube 200 to seal the working port of the handpiece head structure 100. Furthermore, the parting line of the sealing element 300 is designed to be located at the position of the non-sealing part 310 on the sealing element 300. This avoids the sealing effect of the sealing element 300 being affected by burrs, defects, cracks, etc., which may exist on the parting line of the sealing element 300. This improves the sealing effect of the sealing element 300 on the dental curved handpiece head and reduces the impact of corrosion on the internal components of the dental curved handpiece.

[0081] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A dental curved handpiece head, characterized in that, The dental curved handpiece head includes: A head structure, wherein the head structure has a working cavity and a working port communicating with the working cavity; The needle clamping tube is disposed in the working chamber through the working port, and the interior of the needle clamping tube is used to clamp the dental bur to be used; wherein, the machine head structure is used to control the needle clamping tube to rotate about the central axis of the working chamber, so as to drive the dental bur to rotate. A sealing element having a through hole is disposed in the gap between the working port of the machine head structure and the needle clamping tube body, and the needle clamping tube body passes through the through hole of the sealing element. A sealing part is provided at the edge of the through hole of the sealing element, and the sealing part contacts the outer wall of the needle clamping tube body to seal the working port; wherein, the parting line of the sealing element is designed to be located on the sealing element at a position other than the sealing part.

2. The dental curved handpiece head according to claim 1, characterized in that, The sealing element is further provided with a mold closing part, which is disposed on either side of the sealing element in the axial direction. There is a gap between the mold closing part and the clamping needle tube body. The mold closing line of the sealing element is designed to be located on the inner edge of the mold closing part facing the outside of the working cavity or on the inner edge of the mold closing part facing the inside of the working cavity.

3. The dental curved handpiece head according to claim 2, characterized in that, The sealing element is made of a soft or elastic material, and the width of the portion of the sealing element used to seal the gap is designed to be greater than the gap width between the working port of the head structure and the needle clamp tube body.

4. The dental curved handpiece head according to claim 3, characterized in that, The sealing part is designed with an arc-shaped cross-section, and the arc of the sealing part is oriented towards the center of the through hole of the sealing element.

5. The dental curved handpiece head according to any one of claims 1 to 4, characterized in that, The needle clamping tube has a needle clamping spring, which is used to clamp the dental bur inside the needle clamping tube.

6. The dental curved handpiece head according to claim 5, characterized in that, The head unit structure includes: A rotation control assembly is provided, the connecting end of which is sleeved on the outer wall of the needle clamping spring. The rotation control assembly is used to control the needle clamping tube to rotate about the central axis of the working chamber, so as to drive the dental bur to rotate. The head housing has a working cavity and a working port and a rear cover opening communicating with the working cavity. The working port and the rear cover opening are arranged opposite to each other. The rotation control component and the needle clamping tube are both disposed in the working cavity. A rear cover assembly is disposed at the rear cover opening of the head housing to close the rear cover opening.

7. The dental curved handpiece head according to claim 6, characterized in that, The rotation control component includes: The shaft is sleeved on the outer wall of the needle clamping spring. The shaft is the connecting end of the rotation control assembly. The shaft is used to control the needle clamping tube to rotate about the central axis of the working chamber, so as to drive the dental bur to rotate. A bearing assembly is sleeved on the outer wall of the shaft core, and the bearing assembly is used to support the shaft core to rotate.

8. The dental curved handpiece head according to claim 7, characterized in that, The bearing assembly includes: A first bearing is disposed between the shaft core and the machine head housing, and the inner wall of the first bearing is in contact with the outer wall of the shaft core. A second bearing is disposed between the shaft core and the rear cover assembly, and the inner wall of the second bearing is in contact with the outer wall of the shaft core. Both the first bearing and the second bearing are used to support the rotation of the shaft core.

9. The dental curved handpiece head according to claim 6, characterized in that, The rear cover assembly has a pressing extension on one side, which is used to open the needle clamping spring through the pressing extension so that the needle clamping tube body releases its grip on the dental bur.

10. A dental curved handpiece, characterized in that, The dental handpiece includes: The phone body is bent. The dental curved handpiece head as described in any one of claims 1 to 9, wherein the dental curved handpiece head is mounted on the curved handpiece body.

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