A device for removing an intracanal separation instrument

Abstract

The utility model relates to tooth treatment field, concretely relates to a kind of root canal inner separating instrument's taking-out device, including operating rod and hollow intervention rod, intervention rod is detachably connected in operating rod front end, first rack is slidably arranged in operating rod along length direction, second rack is slidably arranged in the one side of first rack, first rack is engaged with first gear, second gear is engaged between first gear and second rack, first gear is connected with connecting rod, handle is connected in the other end of connecting rod, handle is located outside operating rod, first rack and second rack can be stretched from operating rod front end, steel wire fixing structure is arranged in the front end of first rack and the front end of second rack.The utility model can solve the problem of uneven stress of unilateral tightening steel wire in prior art.

Description

Technical Field

[0001] This utility model relates to the field of dental treatment, specifically to a device for removing endodontic instruments. Background Technology

[0002] Root canal treatment is the primary treatment for pulpitis and periapical periodontitis. During treatment, various root canal instruments (such as nickel-titanium files and burs) are used to clean and prepare the root canals. However, due to the complex anatomy of the root canals (including curvature, narrowing, and calcification), instrument fatigue from repeated use, or improper operation (such as excessive force or failure to promptly address instrument jamming), instruments may break and become trapped within the root canal. Retained instruments hinder thorough cleaning and filling, increase the risk of infection, and affect treatment prognosis; therefore, they must be removed to ensure the smooth progress of root canal treatment.

[0003] Currently, there are various methods for removing retained instruments from root canals, such as microsurgical techniques, ultrasonic removal, and snare removal. Among these, the snare removal method has some clinical applications due to its relative simplicity and minimal damage to tooth structure. Its principle involves using a snare made of flexible material such as wire to encircle the retained instrument and then tightening it to remove it.

[0004] The prior art discloses a root canal separation instrument extractor (CN213372614U). A first steel wire is movably connected to a first take-up roller movably installed in the middle of the main body. This first steel wire is connected to a second steel wire movably connected to a second take-up roller movably installed at the right end of the main body. After inserting a rod to fix the second take-up roller, rotating the rotating rod at the upper end of the first take-up roller allows the first and second steel wires to fix the drill bit left inside the root canal. Then, gently applying outward force removes the drill bit from the root canal.

[0005] However, existing technologies still have the following problems: Existing technologies use a single-sided tightening wire. This single-sided force distribution can easily lead to uneven distribution of clamping force on the retained instrument. On the one hand, excessive local clamping force may damage the instrument or root canal wall; on the other hand, uneven force can cause the instrument to shift or tilt during retrieval, increasing the difficulty of retrieval, and may even cause the instrument to further break or become stuck, making it impossible to remove. If attempting simultaneous tightening on both sides, the existing structure requires operators to use two hands or two people to operate the two take-up rollers separately. This operation is cumbersome, makes it difficult to accurately control the rhythm and force of contraction on both sides, and cannot guarantee synchronous and equal force contraction on both sides, affecting the stable clamping of the instrument by the snare. Utility Model Content

[0006] The present invention aims to provide a device for removing instruments from the root canal, so as to solve the problem of uneven force on the unilateral tightening wire in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A device for removing an endodontic dissection instrument includes an operating rod and a hollow intervention rod. The intervention rod is detachably connected to the front end of the operating rod. A first rack is slidably disposed along the length direction inside the operating rod, and a second rack is slidably disposed on one side of the first rack. The first rack meshes with a first gear, and a second gear meshes between the first gear and the second rack. The first gear is connected to a connecting rod, and the other end of the connecting rod is connected to a handle. The handle is located outside the operating rod. The first rack and the second rack can extend from the front end of the operating rod. Both the front ends of the first rack and the front ends of the second rack are provided with a wire fixing structure.

[0008] Preferably, as an improvement, a miniature pressure sensor is provided at the rear end of the first rack, the miniature pressure sensor is electrically connected to a controller, and the controller is electrically connected to an indicator light.

[0009] Preferably, as an improvement, the controller is also electrically connected to a warning light.

[0010] Preferably, as an improvement, one side of the steel wire is provided with micro-serrations.

[0011] Preferably, as an improvement, the intervention rod is a flexible intervention rod.

[0012] Preferably, as an improvement, the wire fixing structure is a wire connecting hole, with both ends of the wire connecting hole penetrating the end and side of the rack, respectively.

[0013] Preferably, as an improvement, the wire fixing structure consists of a locking hole on the first and second racks, and a limiting head that can pass through the locking hole is pressed on the free end of the wire. The width of the limiting head is greater than that of the locking hole, and the thickness of the limiting head is less than that of the locking hole.

[0014] The beneficial effects of this plan are: 1. This solution uses the linkage design of the first and second racks, combined with the transmission of the first and second gears in the middle. Rotating the handle towards the rear of the operating lever drives the first and second racks to slide synchronously. The wire ring can be tightened synchronously on both sides with one hand, so that the instrument retained in the root canal is subjected to uniform force. This avoids the instrument displacement, tilting or root canal wall damage caused by traditional unilateral tightening, and significantly improves the stability and safety of the retrieval process.

[0015] 2. After removing the intervention rod, rotating the handle in the opposite direction will drive the first and second racks to extend synchronously from the front end of the operating rod, exposing the wire fixing structure for easy wire replacement. This solution offers two wire fixing structures for users to choose from: the wire connection hole method is suitable for ordinary wires, where the wire end is simply passed through the connection hole and tied in a knot for fixation; the snap-fit ​​method is suitable for wires with specially designed limiting heads, where the limiting head is inserted into the snap-fit ​​hole and rotated 90° to lock, allowing for faster wire replacement. Regardless of the method, this solution eliminates the need to disassemble the take-up roller compared to traditional devices, significantly improving suture changing efficiency, shortening surgical time, and enhancing clinical ease of operation.

[0016] 3. The miniature pressure sensor integrated at the rear end of the first rack is linked with the indicator light / warning light to monitor the wire tension in real time and provide intuitive feedback. When the pressure reaches the safe threshold (e.g., 5-15N), the indicator light will light up. When overloaded (>20N), the warning light will be triggered, helping doctors to accurately control the operating force, preventing instrument breakage or root canal wall perforation due to improper force, and reducing surgical risks.

[0017] 4. The hollow intervention rod is flexible and can adapt to the physiological structure of the curved root canal, avoiding excessive compression of the root canal wall by the rigid rod, reducing the risk of dentin microcracks, and improving the device's ability to penetrate calcified root canals and narrow root canals, thus expanding its applicable range.

[0018] 5. This solution features micro-serrations on the inside of the wire, which can embed into the surface texture of the instrument (such as the cutting groove of a nickel-titanium file) when tightened, increasing friction and effectively preventing the wire from sliding relative to the instrument. It can maintain stable clamping, especially in a humid root canal environment, solving the problem of traditional smooth wires easily slipping off and improving the success rate of retrieval. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0020] Figure 2 This is a cross-sectional view of Embodiment 1 of the present utility model.

[0021] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle.

[0022] Figure 4 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0023] Figure 5 This is a cross-sectional view of Embodiment 2 of the present invention.

[0024] Figure 6 This is a schematic diagram of the steel wire fixing structure in Embodiment 5 of this utility model.

[0025] Figure 7 This is a schematic diagram of the structure of the end of the steel wire in Embodiment 5 of this utility model.

[0026] The reference numerals in the accompanying drawings include: steel wire 1, intervention rod 2, operating rod 3, handle 4, first rack 5, first gear 6, second gear 7, second rack 8, steel wire connection hole 9, indicator light 10, warning light 11, miniature pressure sensor 12, locking hole 13, limit head 14. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method: Example 1 like Figure 1 and Figure 2 As shown, a device for removing an endodontic dissection instrument includes an operating rod 3 and an intervention rod 2. The intervention rod 2 is threadedly connected to the front end of the operating rod 3. A first rack 5 is slidably disposed within the operating rod 3 along its length. A second rack 8 is slidably disposed on one side of the first rack 5. The first rack 5 and the second rack 8 are slidably connected to the inner wall of the operating rod 3 via a sliding groove and a slider, respectively. The first rack 5 meshes with a first gear 6, and a second gear 7 meshes between the first gear 6 and the second rack 8. A connecting rod is coaxially connected to the first gear 6, and a handle 4 is fixedly connected to the other end of the connecting rod. The handle 4 is located outside the operating rod 3.

[0028] Both the front ends of the first rack 5 and the front ends of the second rack 8 are equipped with steel wire fixing structures, combined with Figure 3 As shown, in this embodiment, the wire fixing structure is a wire connecting hole 9, with both ends of the wire connecting hole 9 penetrating the end and side of the rack, respectively. In this embodiment, the wire 1 is made of medical-grade nickel-titanium steel wire, which has good wear resistance.

[0029] In practical application, after clarifying the location of the dissection instruments using a endodontic microscope or CBCT before the operation, rotate the handle 4 towards the front end of the operating rod 3 (left end in the figure). The handle 4 drives the first gear 6 to rotate, which in turn drives the first rack 5 to move to the left. Simultaneously, the first gear 6 drives the second gear 7 to rotate, which in turn drives the second rack 8 to move to the left. This causes the first rack 5 and the second rack 8 to slide synchronously towards the front end of the operating rod 3. After the front ends of the first rack 5 and the second rack 8 extend from inside the operating rod 3 to a suitable length, stop rotating the handle 4. Select a steel wire 1 of appropriate diameter, and thread both ends through the wire connection holes 9 at the front ends of the first rack 5 and the second rack 8, respectively, and tie them in place. Then, rotate the handle 4 in the opposite direction to retract the first rack 5 and the second rack 8 into the operating rod 3, leaving the steel wire 1 outside the operating rod 3. Then, pass the two strands of steel wire 1 through the intervention rod 2 and thread the intervention rod 2 to the front end of the operating rod 3, so that the middle part of the steel wire 1 protrudes outside the front end of the intervention rod 2, forming a large steel wire loop.

[0030] Holding the operating lever 3, slowly insert the intervention lever 2 along the prepared root canal channel. Observe and adjust its position using a microscope to ensure the wire loop precisely covers the dissecting instrument. Rotate the handle 4 towards the rear end of the operating lever 3. This drives the first rack 5 and the second rack 8 to retract further into the operating lever 3 simultaneously via the first gear 6 and the second gear 7, achieving simultaneous tightening of the wire loop on both sides and ensuring uniform and stable clamping force on the instrument. After tightening to the desired position, keep the handle 4 in the same position and pull the operating lever 3 outward at a uniform speed, using the friction between the wire loop and the instrument to remove it from the root canal.

[0031] When it is necessary to replace wire 1, remove the intervention rod 2, and rotate the handle 4 again to extend the front ends of the first rack 5 and the second rack 8, fully exposing the wire connection hole 9. Untie the knots at both ends of the original wire 1, take the new wire 1, and insert its two ends into the wire connection holes 9 of the first rack 5 and the second rack 8 respectively, and tie the two ends together to form a new wire loop.

[0032] Example 2 Combination Figure 4 and Figure 5 As shown, the difference between this embodiment and embodiment 1 is that a miniature pressure sensor 12, such as a thin-film pressure sensor, is installed at the rear end of the first rack 5. The miniature pressure sensor 12 is electrically connected to a controller, and the controller is electrically connected to an indicator light 10 and a warning light 11.

[0033] In this embodiment, the operator can easily control the rotation force of the handle 4. A preset pressure range value for the steel wire loop tightening device is included in the miniature pressure sensor 12. The first rack 5 slides to contact the miniature pressure sensor 12 under the drive of the handle 4. When the miniature pressure sensor 12 detects that the pressure applied by the first rack 5 reaches the preset value, it sends a signal to the controller, which then illuminates the indicator light 10, prompting the operator to stop rotating the handle 4. Alternatively, a pressure alarm value can be preset. When the miniature pressure sensor 12 detects that the pressure applied by the first rack 5 reaches the alarm value, it sends a signal to the controller, which then illuminates the warning light 11, indicating that the tightening force of the steel wire loop 1 is too high.

[0034] Example 3 The difference between this embodiment and Embodiment 1 is that one side of the wire 1 is provided with micro-serrations. In this embodiment, when installing the wire 1, the side of the wire 1 with micro-serrations is located inside the wire loop. In this way, when the wire loop is used to cover the instruments in the root canal, the micro-serrations can increase the friction and improve the stability of instrument removal.

[0035] Example 4 The difference between this embodiment and embodiment 1 is that the intervention rod 2 is a flexible intervention rod 2. The flexible intervention rod 2 is made of nickel-titanium shape memory alloy, which can adapt to the structure of the root canal, has better flexibility, and reduces excessive compression of the root canal wall by the intervention rod 2.

[0036] Example 5 Combination Figure 6 and Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that the wire fixing structure consists of strip-shaped locking holes 13 on the first rack 5 and the second rack 8. The free end of the wire 1 is pressed into a limiting head 14 that can pass through the locking hole 13. The width of the limiting head 14 is greater than that of the locking hole 13, and the thickness of the limiting head 14 is less than that of the locking hole 13. Using this embodiment, the limiting head 14 can be passed through the locking hole 13 first and then rotated 90° to lock the limiting head 14 on the opposite side of the locking hole 13. This allows for quick assembly and disassembly of the wire 1 in a few seconds, improving the assembly and disassembly efficiency of the wire 1.

[0037] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for removing an intracanal dissection instrument, characterized in that: The device includes an operating lever and a hollow intervention lever. The intervention lever is detachably connected to the front end of the operating lever. A first rack is slidably arranged along the length direction inside the operating lever, and a second rack is slidably arranged on one side of the first rack. The first rack meshes with a first gear, and a second gear meshes between the first gear and the second rack. The first gear is connected to a connecting rod, and the other end of the connecting rod is connected to a handle. The handle is located outside the operating lever. The first rack and the second rack can extend from the front end of the operating lever. Both the front ends of the first rack and the front ends of the second rack are provided with steel wire fixing structures.

2. The device for removing an intracanal dissection instrument according to claim 1, characterized in that: A miniature pressure sensor is located at the rear end of the first rack. The miniature pressure sensor is electrically connected to a controller, and the controller is electrically connected to an indicator light.

3. The device for removing an intracanal dissection instrument according to claim 2, characterized in that: The controller is also electrically connected to a warning light.

4. The device for removing an intracanal dissection instrument according to claim 1, characterized in that: The steel wire has micro-serrations on one side.

5. The device for removing an intracanal dissection instrument according to claim 1, characterized in that: The interventional rod is a flexible interventional rod.

6. The device for removing an intracanal dissection instrument according to claim 1, characterized in that: The wire fixing structure consists of wire connecting holes, with the two ends of the wire connecting holes penetrating the end and side of the rack, respectively.

7. The device for removing an intracanal dissection instrument according to claim 1, characterized in that: The wire fixing structure consists of locking holes on the first and second racks. A limiting head that can pass through the locking holes is pressed on the free end of the wire. The width of the limiting head is greater than that of the locking hole, and the thickness of the limiting head is less than that of the locking hole.

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