An angled handpiece with a built-in conductive sheet on the back cover and a root canal preparation machine

Abstract

The present invention relates to a contralateral handpiece with a built-in conductive sheet in the back cover and a root canal preparation machine. The contralateral handpiece with a built-in conductive sheet in the back cover comprises a handpiece, a back cover and a cutting tool. A core assembly for driving the cutting tool to rotate is provided in the handpiece, and a conductive sheet is provided in the back cover. The conductive sheet comprises a semi-ring body and an elastic part. The semi-ring body is sleeved in the back cover, the tail end of the elastic part is connected to the middle part of the semi-ring body, and the front end of the elastic part extends to the center of the semi-ring body. When the back cover is fixed to the handpiece, the front end of the elastic part contacts the center of the end face of the cutting tool.

Description

Technical Field

[0001] The present invention relates to the technical field of dental auxiliary equipment, in particular to a contra-angle handpiece with a built-in conductive sheet on the back cover and a root canal preparation machine. Background Art

[0002] A device is known for performing root canal treatment and simultaneously measuring the root canal, wherein a cutting tool, such as a file or a dental drill, is used which also serves as a measuring probe. In this case, the cutting tool serves as an electrode in a circuit for measuring the length of the root canal, and the measurement signal is transmitted to a control host.

[0003] Some contra-angle handpieces with root canal length measurement function integrate the conduction circuit inside the handpiece, relying on the conductive sheet's own elasticity to hold the rotating shaft to ensure that the test signal can be transmitted to the cutting tool during rotation. However, the relative linear speed between the conductive sheet and the rotating shaft inside the contra-angle handpiece is large, which makes the conductive sheet more susceptible to wear (severely reducing the life of the conductive sheet). In addition, the impurities generated after wear lead to poor contact between the rotating shaft and the conductive sheet, affecting the transmission of the test signal. In addition, the brush sheet is integrated inside the handpiece, making it very difficult to disassemble and the maintenance cost very high. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a contra-angle handpiece and a root canal preparation machine with a simple structure and a long service life and a built-in conductive sheet on the back cover.

[0005] In order to solve the above technical problems, the present invention provides a bending machine head with a built-in conductive sheet in the back cover, comprising a machine head, a back cover and a cutting tool. A core assembly for driving the cutting tool to rotate is provided in the machine head, and a conductive sheet is provided in the back cover. The conductive sheet comprises a semi-ring body and an elastic part. The semi-ring body is sleeved in the back cover, the tail end of the elastic part is connected to the middle part of the semi-ring body, and the front end of the elastic part extends to the center of the semi-ring body. When the back cover is fixed to the machine head, the front end of the elastic part contacts the center of the end face of the cutting tool, so that the conductive sheet and the cutting tool are always in a conductive state.

[0006] Furthermore, cutting grooves are provided on both sides of the tail end of the elastic part on the semi-ring body, and the front end of the elastic part is tilted downward to facilitate contact between the front end of the elastic part and the center of the cutting tool.

[0007] Furthermore, the elastic part is an elastic sheet, a spring, or a thimble arranged in a cross shape.

[0008] Furthermore, the rear cover includes a connecting tube and an end cap, and the outer wall of the connecting tube is provided with a slot adapted to the semi-ring body so that the semi-ring body is sleeved on the slot of the connecting tube, and the end cap is sleeved with the connecting tube to limit the semi-ring body.

[0009] Furthermore, the end cap is provided with a mounting hole, and a cover plate is embedded in the mounting hole.

[0010] Furthermore, the back cover also includes a circular pressing plate for limiting the cover plate, and a avoidance groove adapted to the elastic part is provided on the pressing plate, and the avoidance groove extends from the edge of the pressing plate to the center so that the elastic part can pass through the pressing plate.

[0011] Furthermore, the rear cover also includes an elastic support member placed in the connecting tube, and the elastic support member is composed of a plurality of wave washers and washers arranged at intervals, providing elastic support for the pressure plate.

[0012] Furthermore, a rectangular groove is provided on the outer wall of the connecting tube along the axial direction for evading the elastic part.

[0013] Furthermore, an external thread is provided at the front end of the connecting tube, and an internal thread adapted to the external thread is provided on the machine head, so that the rear cover is threadably connected to the machine head.

[0014] Furthermore, the rear cover also includes a sealing ring, and an annular groove is provided on the outer wall of the connecting tube. After the rear cover is connected to the machine head, the sealing ring is placed in the annular groove to provide damping between the rear cover and the machine head to prevent the thread from loosening.

[0015] A root canal preparation machine comprises the above-mentioned contra-angle handpiece with a built-in conductive sheet in the rear cover.

[0016] The technical effects of the invention are as follows: (1) Compared with the prior art, the bending machine head with a built-in conductive sheet in the back cover of the present invention is that when the cutting tool is in high-speed rotation, the conductive sheet is in a static compression state and rubs against the end face of the cutting tool. Since the relative friction between the conductive sheet and the cutting tool is located at the center of the rotating axis of the cutting tool, the relative friction speed is very small, thereby greatly reducing the wear of the conductive sheet and the cutting tool and improving the service life of the conductive sheet. In addition, since the cutting tool is a consumable and is frequently replaced, even if impurities appear after wear, they will be taken away with the new cutting tool, further ensuring the conductive connection performance between the cutting tool and the machine head. Finally, even if a problem occurs, the back cover with the conductive sheet is easy to disassemble and install, thereby perfectly solving the problem of the service life of the cutting tool and the conductive sheet; (2) The conductive sheet is composed of a semi-ring body and an elastic part. The semi-ring body is easy to be assembled and sleeved. The setting of the cutting groove is conducive to the compression of the elastic part; the semi-ring body is limited and assembled by the end cap and the connecting tube, and the connection is firm and easy to disassemble and assemble; (3) The setting of the pressure plate facilitates the fixing of the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic cross-sectional view of the contra-angle handpiece with a built-in conductive sheet in the back cover of the present invention;

[0019] Figure 2This is a schematic diagram of the cross-sectional structure of the contra-angle handpiece with a built-in conductive sheet in the back cover after explosion;

[0020] Figure 3 It is a schematic diagram of the exploded structure of the back cover of the present invention;

[0021] In the figure: cutting tool 1, head 2, conductive sheet 3, half ring 31, elastic part 32, cutting groove 33,

[0022] Back cover 4, head housing 5, end cap 6, mounting hole 61, cover plate 62, connecting tube 7, annular groove 71, rectangular groove 72, external thread 73, card slot 74, pressure plate 8, avoidance groove 81, first corrugated washer 91, first washer 92, second corrugated washer 93, second washer 94, sealing ring 95. DETAILED DESCRIPTION

[0023] Example 1

[0024] like Figures 1 to 3 As shown, the bending machine head with a built-in conductive sheet in the back cover of this embodiment includes a machine head 2, a back cover 4 and a cutting tool 1. A core component for driving the cutting tool 1 to rotate is provided in the machine head 2, and one side of the machine head 2 is connected to the handle (not shown in the figure) through the machine head shell 5; the back cover 4 includes a connecting tube 7 and an end cap 6, a conductive sheet 3 is provided in the back cover 4, and the conductive sheet 3 includes a semi-ring body 31 and an elastic part 32 that are integrally formed. The outer wall of the connecting tube 7 is provided with a groove 74 that is adapted to the semi-ring body 31, so that the semi-ring body 31 is sleeved on the groove 74 of the connecting tube 7, and the end cap 6 is glued and fixed or interference fit with the connecting tube 7 after sleeve fitting, which is used to perform The rear end of the elastic portion 32 is connected to the middle of the semi-ring body 31, and the front end of the elastic portion 32 extends to the center of the semi-ring body 31. Cutting grooves 33 are provided on both sides of the rear end of the elastic portion 32 on the semi-ring body 31. The elastic portion 32 is an elastic sheet arranged in a "J" shape (in other embodiments, it can also be a spring or an elastic ejector pin). The rear end of the elastic sheet is bent and connected to the semi-ring body 31. The front end of the elastic sheet is tilted downward to facilitate contact between the front end of the elastic sheet and the center of the cutting tool 1. When the rear cover 4 is fixed to the machine head 2, the front end of the elastic sheet is in contact with the center of the end face of the cutting tool 1, so that the conductive sheet 3 and the cutting tool 1 are always in a conductive state.

[0025] Preferably, the end cap 6 is provided with a mounting hole 61 , and a cover plate 62 is embedded in the mounting hole 61 for observing the conductive sheet 3 .

[0026] Preferably, the back cover 4 also includes a circular pressure plate 8 for limiting the cover plate 62. The pressure plate 8 is provided with an avoidance groove 81 adapted to the elastic part 32. The avoidance groove 81 extends from the edge of the pressure plate 8 to the center so that the elastic part 32 can pass through the pressure plate 8.

[0027] Preferably, the rear cover 4 further includes an elastic support member disposed in the connecting tube 7 , which is composed of a first corrugated washer 91 , a first washer 92 , a second corrugated washer 93 , and a second washer 94 that are spaced apart to provide elastic support for the pressure plate 8 .

[0028] Preferably, a rectangular groove 72 is provided on the outer wall of the connecting tube 7 along the axial direction for evading the elastic portion 32 .

[0029] Preferably, an external thread 73 is provided at the front end of the connecting tube 7 , and an internal thread matching the external thread 73 is provided on the machine head 2 so that the rear cover 4 is threadedly connected to the machine head 2 .

[0030] Preferably, the rear cover 4 also includes a sealing ring 95, and an annular groove 71 is provided on the outer wall of the connecting tube 7. After the rear cover 4 is connected to the machine head 2, the sealing ring 95 is placed in the annular groove 71 to provide damping between the rear cover 4 and the machine head 2 to prevent the threads from loosening.

[0031] Example 2

[0032] A root canal preparation machine comprises the curved handpiece head with a built-in conductive sheet in the back cover as described in Example 1.

[0033] Obviously, the above embodiments are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all embodiments here. However, such obvious variations or modifications arising from the spirit of the present invention remain within the scope of protection of the present invention.

Claims

1. A contra-angle handpiece with a built-in conductive sheet on the back cover, characterized in that: The invention comprises a machine head, a back cover and a cutting tool, wherein a core assembly for driving the cutting tool to rotate is provided in the machine head, a conductive sheet is provided in the back cover, and the conductive sheet comprises an integrally formed semi-ring body and an elastic portion, the semi-ring body being sleeved in the back cover, the tail end of the elastic portion being connected to the middle portion of the semi-ring body, and the front end of the elastic portion extending to the center of the semi-ring body. When the back cover and the machine head are fixed, the front end of the elastic portion contacts the center of the end face of the cutting tool; The rear cover includes a connecting tube and an end cap. The outer wall of the connecting tube is provided with a slot adapted to the semi-ring body so that the semi-ring body is sleeved on the slot of the connecting tube. The end cap is provided with a mounting hole, and a cover plate is embedded in the mounting hole; The back cover also includes a circular pressing plate for limiting the cover plate. The pressing plate is provided with an avoidance groove adapted to the elastic part. The avoidance groove extends from the edge of the pressing plate to the center so that the elastic part can pass through the pressing plate.

2. The contra-angle handpiece with a built-in conductive sheet on the back cover according to claim 1, characterized in that: Cutting grooves are arranged on both sides of the tail end of the elastic part of the semi-ring body, and the front end of the elastic part is arranged to be tilted downward.

3. The contra-angle handpiece with a built-in conductive sheet in the back cover according to claim 2, characterized in that: The elastic part is an elastic sheet, a spring, or an ejector pin arranged in a cross shape.

4. The contra-angle handpiece with a built-in conductive sheet on the back cover according to claim 1, characterized in that: The rear cover further comprises an elastic support member disposed in the connecting tube, wherein the elastic support member is composed of a plurality of wave washers and washers arranged at intervals.

5. The contra-angle handpiece with a built-in conductive sheet on the back cover according to claim 4, characterized in that: A rectangular groove is axially arranged on the outer wall of the connecting cylinder.

6. The contra-angle handpiece with a built-in conductive sheet on the back cover according to claim 5, characterized in that: The front end of the connecting tube is provided with an external thread, and the machine head is provided with an internal thread adapted to the external thread.

7. A root canal preparation machine, characterized in that: A contra-angle handpiece with a built-in conductive sheet in the back cover as described in any one of claims 1 to 6.

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