Clamp-type intracanal broken instrument retriever

Abstract

This invention discloses a clamping-type intracanal broken needle extractor, comprising a gripping handle and an extraction body. The extraction body includes a connecting part, a retention outer tube, and a clamping inner tube. The retention outer tube is detachably connected to the gripping handle via the connecting part. The end of the retention outer tube opposite to the gripping handle has an inner diameter-reducing section, the inner diameter of which gradually decreases towards the gripping handle. The clamping inner tube slides through the retention outer tube so that its head extends or retracts into the end of the retention outer tube opposite to the gripping handle. The head of the clamping inner tube has multiple circumferentially distributed elastic clamping claws, the inner side of which has protruding ridges that engage with the outer texture of the broken needle. The invention also includes a drive assembly and a power supply unit. The drive assembly is disposed within the gripping handle to drive the sliding of the clamping inner tube, and the power supply unit provides power to the drive assembly. This invention can conveniently extract broken needles and provides a stable and controllable clamping force, reducing trauma to the patient.

Description

Technical Field

[0001] This invention relates to a clamping-type intracanal broken needle extractor, belonging to the field of medical device technology. Background Technology

[0002] In clinical root canal treatment, instrument separation is inevitable, leading to broken needles within the root canal, which can become firmly lodged within the canal wall. Currently, the most common method for removing broken needles is to use surgical forceps to clamp the end of the broken needle outside the root canal and pull it outwards. However, this requires dissecting the area around the broken needle within the root canal to expose one end of the broken needle, which introduces significant surgical trauma to the patient, hinders postoperative healing, and is cumbersome, making it difficult for the surgeon to provide stable clamping force. Therefore, there is an urgent need for a method to remove broken needles that provides stable and adjustable clamping force, firmly holding the visible broken needle within the root canal and pulling it outwards. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a clamping-type intracanal broken needle extractor that can conveniently retrieve broken needles and provide a stable and controllable clamping force, reducing trauma to patients.

[0004] To achieve the above-mentioned technical objectives and effects, this application provides the following technical solution:

[0005] A clamping-type root canal broken needle extractor includes a gripping handle and an extraction body. The extraction body includes a connecting part, a retaining outer tube, and a clamping inner tube. The retaining outer tube is detachably connected to the gripping handle via the connecting part. The end of the retaining outer tube away from the gripping handle has an inner diameter-reducing section, the inner diameter of which gradually decreases towards the gripping handle. The clamping inner tube slides through the retaining outer tube so that its head extends out or into the end of the retaining outer tube away from the gripping handle. The head of the clamping inner tube has multiple circumferentially distributed elastic clamping claws, and the inner side of each elastic clamping claw has a protruding ridge that engages with the outer texture of the broken needle. The device also includes a drive assembly and a power supply unit. The drive assembly is disposed within the gripping handle to drive the sliding of the clamping inner tube, and the power supply unit supplies power to the drive assembly.

[0006] Preferably, the inner diameter of the elastic clamping claw is slightly smaller than the outer diameter of the broken needle, and the inner wall of the end of the elastic clamping claw away from the clamping inner tube is provided with a chamfer.

[0007] Preferably, the maximum inner diameter of the inner diameter reduction section is within the range of 1.0 to 1.1 times the outer diameter of the elastic clamping claw, and the minimum inner diameter of the inner diameter reduction section is within the range of 0.9 to 1.0 times the outer diameter of the elastic clamping claw.

[0008] Preferably, the drive assembly includes a drive motor, a drive screw, and a drive slide. The drive motor is detachably mounted inside the grip handle. The drive screw is coaxially fixed with the output shaft of the drive motor. The drive slide is screwed to the drive screw and its rotation is restricted by the inner wall of the grip handle. The end of the clamping inner tube is fixedly connected to the drive slide. A control switch electrically connected to the drive motor is provided on the outer wall of the grip handle.

[0009] Furthermore, the drive motor includes a miniature DC brushed motor or a miniature stepper motor.

[0010] Furthermore, the drive carriage includes a sliding main frame and a fixing cover. The fixing cover is detachably disposed on the side of the sliding main frame away from the drive motor. The end of the clamping inner tube is provided with a limiting part. The head end of the clamping inner tube passes through the fixing cover, and the limiting part is pressed between the fixing cover and the sliding main frame.

[0011] Furthermore, the handle has an open end and a mounting base screwed to its outer wall, and the drive motor is detachably mounted in the mounting base so as to be embedded in the handle through the mounting base.

[0012] Furthermore, a limit block is detachably provided at the end of the drive screw opposite to the drive motor to limit the maximum sliding distance of the drive carriage.

[0013] Preferably, both the retaining outer tube and the clamping inner tube are metal tubes with deformation capability.

[0014] The clamping-type intracanal broken needle extractor provided by this invention has the following advantages: The clamping-type broken needle extractor of the present invention uses multiple circumferentially distributed elastic clamping claws on the clamping inner tube to snare the broken needle. At the same time, the protruding ridges on the elastic clamping claws are adapted to the texture on the broken needle to hook and reduce the possibility of the broken needle slipping out. After snare, the clamping inner tube is driven by the driving component to retract into the fixing outer tube. The multiple elastic clamping claws are pressed simultaneously by the inner diameter reduction section of the fixing outer tube to achieve stable clamping of the broken needle, which improves the convenience and stability of clamping. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the clamping-type broken needle extractor for root canals provided in an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the internal structure of the clamp-type root canal broken needle extractor, which is a key feature of this invention. Figure 1 ; Figure 3 for Figure 2 Enlarged diagram of section A in the middle; Figure 4 This is a schematic cross-sectional view of the internal structure of the clamp-type root canal broken needle extractor, which is a key feature of this invention. Figure 2 ; Figure 5 for Figure 4 Enlarged schematic diagram of section B.

[0016] In the picture: 1-Holding handle; 2-Removing main body; 21-Connecting part; 22-Fixing outer tube; 221-Inner wall diameter reduction section; 23-Clamping inner tube; 231-Elastic clamping claw; 232-Protruding ridge; 233-Limiting part; 3-Drive assembly; 31-Drive motor; 32-Drive screw; 33-Drive slide; 331-Sliding main frame; 332-Fixing cover; 4-Control switch; 5-Charging interface; 6-Mounting base; 7-Limiting block. Detailed Implementation

[0017] The technical solutions of the embodiments of this application 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 this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Reference Figures 1-5 A clamping-type root canal broken needle extractor includes a gripping handle 1 and an extraction body 2; The main body 2 includes a connecting part 21, a retaining outer tube 22, and a clamping inner tube 23. The retaining outer tube 22 is integrally formed with the connecting part 21. The connecting part 21 is screwed to the inner wall of the head end of the grip handle 1 to realize the detachable connection between the retaining outer tube 22 and the grip handle 1. The end of the retaining outer tube 22 away from the grip handle 1 has an inner wall diameter reduction section 221. The inner diameter of the inner wall diameter reduction section 221 gradually decreases in the direction close to the grip handle 1. The inner clamping tube 23 slides through the outer fixing tube 22 so that the head of the inner clamping tube 23 extends out of or into the outer fixing tube 22 at the end opposite to the gripping handle 1. The head of the inner clamping tube 23 has multiple circumferentially distributed elastic clamping claws 231. The inner wall of the end of the elastic clamping claw 231 opposite to the inner clamping tube 23 is provided with a chamfer to facilitate the elastic clamping claw 231 in taking the broken needle. The inner diameter of the elastic clamping claw 231 is slightly smaller than the outer diameter of the broken needle, such as 0.95 to 0.99 times the outer diameter of the broken needle, so that a certain clamping force is obtained in advance after the elastic clamping claw 231 takes the broken needle. The inner side of the elastic clamping claw 231 has a protruding ridge 232 that matches the texture on the outer side of the broken needle.

[0019] When gripping a broken needle, the elastic gripping claw 231 of the inner tube 23 extends out of the outer retaining tube 22 to fit the broken needle. At the same time, the protruding ridge 232 on the elastic gripping claw 231 is matched with the texture on the broken needle to hook it. Thus, the broken needle can be driven into the outer retaining tube 22 by the rearward movement of the inner tube 23, reducing the possibility of the broken needle slipping out. The maximum inner diameter of the inner diameter reduction section is in the range of 1.0 to 1.1 times the outer diameter of the elastic gripping claw 231, and the minimum inner diameter of the inner diameter reduction section is in the range of 0.9 to 1.0 times the outer diameter of the elastic gripping claw 231. With this setting, after the broken needle is driven back into the outer retaining tube 22 by the gripping inner tube 23, multiple elastic gripping claws 231 are pressed simultaneously by the inner diameter reduction section 221 of the outer retaining tube 22 to achieve stable gripping of the broken needle. In this embodiment, both the outer tube 22 and the inner tube 23 are metal tubes with deformation capabilities, which makes it convenient for medical staff to pre-bend the front of the outer tube 22 and the inner tube 23 according to the needle removal angle.

[0020] Reference Figures 1-5 The clamping-type root canal broken needle extractor also includes a drive assembly 3 and a power supply unit. The drive assembly 3 is installed in the grip handle 1 to drive the sliding of the clamping inner tube 23. The power supply unit is used to supply power to the drive assembly 3. In this embodiment, the power supply unit adopts a miniature rechargeable lithium battery. The grip handle 1 is provided with a charging interface 5 that is electrically connected to the power supply unit. The charging interface 5 includes, but is not limited to, standard USB type, dedicated contact type and solder direct connection type.

[0021] The drive assembly 3 includes a drive motor 31, a drive screw 32, and a drive slide 33. The drive motor 31 is a miniature DC brushed motor or a miniature stepper motor, capable of forward and reverse rotation and speed adjustment, and is detachably installed inside the grip handle 1. The drive screw 32 is coaxially and fixedly connected to the output shaft of the drive motor 31. The drive slide 33 is screwed to the drive screw 32 and its rotation is restricted by the inner wall of the grip handle 1, thereby converting the threaded rotation of the drive screw 32 into linear sliding of the drive slide 33 along the axis of the drive screw 32. The end of the clamping inner tube 23 is fixedly connected to the drive slide 33, and the sliding of the drive slide 33 drives the sliding of the clamping inner tube 23. A control switch 4, electrically connected to the drive motor 31 and the power supply unit, is installed on the outer wall of the grip handle 1 to control the energization, start-up, forward and reverse rotation, and speed adjustment of the drive motor 31. In this embodiment, the application of the control switch 4 is prior art and will not be described in detail.

[0022] Reference Figure 2 and Figure 4In a further embodiment, the drive carriage 33 includes a sliding main frame 331 and a fixing cover 332. The fixing cover 332 is detachably installed on the side of the sliding main frame 331 away from the drive motor 31 by bolts. The drive screw 32 passes through the bottom of the sliding main frame 331 and is screwed in. The drive screw 32 does not pass through the front side of the sliding main frame 331 and the fixing cover 332 during the sliding stroke. The end of the clamping inner tube 23 is integrally formed with a limiting part 233. In feasible embodiments, the limiting part 233 can be a block of any shape. In this embodiment, the limiting part 233 is preferably a cylinder with an outer diameter larger than the outer diameter of the clamping inner tube 23. The head end of the clamping inner tube 23 passes through the fixing cover 332. The limiting part 233 is pressed between the fixing cover 332 and the sliding main frame 331, thereby realizing the installation and fixation of the clamping inner tube 23, and realizing the practicality and service life of the replacement lifting extractor as a whole.

[0023] Reference Figure 1 , Figure 2 and Figure 4 In a further embodiment, the handle 1 has an open end and a mounting base 6 screwed onto its outer wall. The power supply unit (not shown in the figure) is installed in the mounting base 6, and the charging interface 5 is integrated into the bottom of the mounting base 6. The drive motor 31 is detachably installed in the mounting base 6 by screws so that it can be embedded into the handle 1 through the mounting base 6. After the drive screw 32 is connected and fixed to the output shaft of the drive motor 31 by a coupling, the drive slide 33 and the clamping inner tube 23 are installed in sequence. Then the drive motor 31 and the power supply unit are electrically connected. Finally, the entire drive assembly 3 is sent into the handle 1 through the mounting base 6 and then fixed in place by screwing the mounting base 6 to the handle 1.

[0024] Furthermore, a limiting block 7 is detachably installed on the end of the drive screw 32 away from the drive motor 31 by bolts to limit the maximum sliding distance of the drive carriage 33. In feasible embodiments, the limiting block 7 can be a block of any shape. In this embodiment, the limiting block 7 is preferably a cylindrical block that is coaxially arranged with the drive screw 32 and has an outer diameter larger than that of the drive screw 32.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A clamping-type intracanal broken needle extractor, characterized in that, The device includes a grip handle (1) and a removal body (2). The removal body (2) includes a connecting part (21), a retaining outer tube (22), and a clamping inner tube (23). The retaining outer tube (22) is detachably connected to the grip handle (1) through the connecting part (21). The end of the retaining outer tube (22) away from the grip handle (1) has an inner diameter reduction section (221). The inner diameter of the inner diameter reduction section (221) gradually decreases in the direction close to the grip handle (1). The clamping inner tube (23) slides through the retaining outer tube (221). The inner tube (23) is positioned so that the head of the inner tube (23) extends out or into the outer tube (22) away from the handle (1). The head of the inner tube (23) has multiple circumferentially distributed elastic gripping claws (231). The inner side of the elastic gripping claws (231) has a protruding ridge (232) that matches the outer texture of the broken needle. The handle (1) also includes a drive assembly (3) and a power supply unit. The drive assembly (3) is located inside the handle (1) to drive the sliding of the inner tube (23). The power supply unit is used to supply power to the drive assembly (3).

2. The clamping-type intracanal broken needle extractor as described in claim 1, characterized in that, The inner diameter of the elastic clamping claw (231) is slightly smaller than the outer diameter of the broken needle, and the inner wall of the end of the elastic clamping claw (231) facing away from the clamping inner tube (23) is provided with a chamfer.

3. The clamping-type intracanal broken needle extractor as described in claim 1, characterized in that, The maximum inner diameter of the inner diameter reduction section is within the range of 1.0 to 1.1 times the outer diameter of the elastic clamping claw (231), and the minimum inner diameter of the inner diameter reduction section is within the range of 0.9 to 1.0 times the outer diameter of the elastic clamping claw (231).

4. The clamping-type intracanal broken needle extractor as described in claim 1, characterized in that, The drive assembly (3) includes a drive motor (31), a drive screw (32), and a drive slide (33). The drive motor (31) is detachably installed inside the grip handle (1). The drive screw (32) is coaxially fixed with the output shaft of the drive motor (31). The drive slide (33) is screwed to the drive screw (32) and restricted from rotation by the inner wall of the grip handle (1). The end of the clamping inner tube (23) is fixedly connected to the drive slide (33). A control switch (4) electrically connected to the drive motor (31) is provided on the outer wall of the grip handle (1).

5. The clamping-type intracanal broken needle extractor as described in claim 4, characterized in that, The drive motor (31) includes a miniature DC brushed motor or a miniature stepper motor.

6. The clamping-type intracanal broken needle extractor as described in claim 4, characterized in that, The drive carriage (33) includes a sliding main frame (331) and a fixing cover (332). The fixing cover (332) is detachably disposed on the side of the sliding main frame (331) away from the drive motor (31). The end of the clamping inner tube (23) is provided with a limiting part (233). The head end of the clamping inner tube (23) passes through the fixing cover (332). The limiting part (233) is pressed between the fixing cover (332) and the sliding main frame (331).

7. The clamping-type intracanal broken needle extractor as described in claim 4, characterized in that, The handle (1) has an open end and a mounting base (6) screwed onto its outer wall. The drive motor (31) is detachably mounted in the mounting base (6) so that it can be embedded in the handle (1) through the mounting base (6).

8. The clamping-type intracanal broken needle extractor as described in claim 4, characterized in that, The end of the drive screw (32) opposite to the drive motor (31) is detachably provided with a limit block (7) to limit the maximum sliding distance of the drive carriage (33).

9. The clamping-type intracanal broken needle extractor as described in any one of claims 1-8, characterized in that, Both the fixed outer tube (22) and the clamping inner tube (23) are metal tubes with deformation capabilities.

Images