Extraction forceps

Abstract

The utility model relates to medical instrument technical field especially is involved in tooth forceps, including the first handle and second handle of split type design, the first handle front end is connected with the first bill, the second handle front end is connected with the second bill, and the first bill and the second bill are articulated through the fulcrum pivot between, be provided with the connecting rod adjusting mechanism for adjusting the fulcrum pivot position on the first handle, and the connecting rod adjusting mechanism includes with slide rail assembly and multilink linkage assembly, and slide rail assembly extends along the first handle inner surface axial direction, and slide rail assembly and multilink linkage assembly one end swing joint, multilink linkage assembly is connected between the fulcrum bearing and slide rail assembly, and one end of multilink linkage assembly is fixed on the second handle, the utility model discloses through setting adjustable clamping fulcrum structure, realizes the adjustment to the mouthful of clamping fulcrum position, to adapt to the anatomical form of different tooth root, reduces the risk of crown fragmentation, and promotes the efficiency and safety of tooth extraction operation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a tooth extraction forceps. Background Technology

[0002] Tooth extraction forceps are frequently used instruments in clinical dental practice. During use, the dentist uses the beaks of the forceps to grasp the crown or root of the tooth, and through manipulation such as shaking, twisting, and traction, loosens and dislocates the tooth. Tooth extraction forceps generally consist of a handle, a joint, and beaks. The dentist applies force to the handle, which in turn moves the beaks via the joint. This design allows the beaks to open and close freely during operation, while also conserving effort.

[0003] However, in clinical dental procedures, teeth exhibit diverse shapes, and the joints of traditional extraction forceps are generally fixed. This means that the fulcrum of the forceps beaks cannot meet the extraction needs of teeth with different shapes. Therefore, different types of extraction forceps with varying beaks must be selected based on the extraction site, the type of crown, the root morphology, and the specific needs of the surgery. For example, when dealing with a curved tooth root, the fixed fulcrum of traditional extraction forceps may prevent the beaks from fully contacting the root, resulting in uneven force distribution and increasing the risk of crown breakage, which in turn affects subsequent treatment.

[0004] Therefore, there is an urgent need for a tooth extraction forceps that can flexibly adjust the clamping fulcrum and adapt to various tooth shapes. Utility Model Content

[0005] In order to address the technical deficiencies mentioned in the background art, the purpose of this utility model is to provide a tooth extraction forceps that, by setting an adjustable clamping fulcrum structure, allows for adjustment of the clamping fulcrum position of the forceps jaws, thereby adapting to different tooth root anatomical morphologies, reducing the risk of crown fragmentation, and improving the efficiency and safety of tooth extraction operations.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tooth extraction forceps includes a split first handle and a second handle. A first jaw is connected to the front end of the first handle, and a second jaw is connected to the front end of the second handle. The first jaw and the second jaw are hinged together by a pivot shaft. The first handle is provided with a linkage adjustment mechanism for adjusting the position of the pivot shaft. The linkage adjustment mechanism includes a slide rail assembly for adjusting the distance between the first jaw and the second jaw, and a multi-link linkage assembly for driving the slide rail assembly and the pivot shaft. The slide rail assembly extends axially along the inner surface of the first handle, and one end of the slide rail assembly is movably connected to the multi-link linkage assembly. The multi-link linkage assembly is connected between the pivot shaft and the pivot shaft, and one end of the multi-link linkage assembly is fixed to the second handle. By manually operating the slide rail assembly to slide along the first handle, the multi-link linkage assembly is driven to adjust the position of the pivot shaft, thereby changing the clamping pivot position of the second jaw and the first jaw.

[0008] Preferably, the slide rail assembly includes a guide rail groove formed on the surface of the first clamp handle, a slider that can slide along the guide rail groove, and an operating knob disposed on the slider; the vertical cross-section of the guide rail groove is T-shaped, the bottom end of the slider is provided with a T-shaped protrusion that mates with the guide rail groove, and the slider is provided with a threaded hole; the bottom end of the operating knob is provided with a threaded rod, and the operating knob protrudes from the guide rail groove; the threaded rod is threadedly engaged with the threaded hole on the slider, and the threaded rod is connected to the multi-link linkage assembly for transmission.

[0009] Preferably, the guide rail groove is provided with limiting bosses at both ends, and the slider side is provided with buffer rubber blocks that cooperate with the limiting bosses.

[0010] Preferably, the multi-link linkage assembly includes a first link, a second link, and a third link. One end of the first link is connected to a threaded rod, and the other end is connected to the second link via a short link. The two ends of the short link are hinged to the first link and the second link respectively via hinge shafts. A fixed bearing seat is provided at the connection between the second link and the third link. The fixed bearing seat is located on the second jaw arm extending from the root of the second jaw, and is rotatably connected to both the second link and the third link. The end of the third link that is offset from the second link is fixedly connected to a fulcrum bearing by a collar.

[0011] Preferably, a perforation with a central hole is provided on the first jaw arm extending from the root of the first jaw, and the second jaw passes through the perforation and engages with the first jaw.

[0012] Preferably, the first jaw arm extending from the root of the first jaw is further provided with a guide groove for guiding the pivot shaft. The guide groove extends axially along the surface of the first jaw arm and has an arc-shaped structure. The pivot shaft passes through the guide groove and slides along the guide groove.

[0013] Preferably, the outer sides of the first and second clamp handles are fitted with anti-slip handle sleeves, and the first clamp handle has scale markings engraved on one side of the guide rail groove.

[0014] Preferably, the clamping surfaces of the first and second jaws are provided with teeth, the teeth including arc-shaped teeth for adapting to curved roots and large-pitch teeth for adapting to fused roots.

[0015] In summary, the beneficial effects of this utility model are as follows:

[0016] This utility model of extraction forceps, through the cooperation of a slide rail assembly and a multi-link linkage assembly, allows for precise adjustment of the clamping fulcrum positions of the first and second jaws. This adjustment enables the forceps to adapt to the extraction needs of teeth with different shapes, such as curved roots and fused roots, reducing problems such as crown breakage and root remnants caused by improper fulcrum during extraction, and improving the efficiency and safety of extraction operations. Furthermore, this flexible fulcrum adjustment function expands the applicability of the extraction forceps, allowing the same forceps to handle extraction operations of various complex tooth shapes. This reduces the types of extraction forceps required in clinical practice, lowers medical costs, and also improves the ease and efficiency of operation for dentists. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the tooth extraction forceps of this utility model;

[0018] Figure 2 yes Figure 1 Enlarged view of the structure at point a;

[0019] Figure 3 This is a front view of the tooth extraction forceps of this utility model;

[0020] Figure 4 This is an exploded view of the tooth extraction forceps of this utility model;

[0021] Figure 5 yes Figure 4 Enlarged view of the structure at point b.

[0022] Explanation of the markings in the diagram:

[0023] 1. First clamp handle; 11. First clamp beak; 12. First clamp beak arm; 121. Through hole; 122. Guide groove; 2. Second clamp handle; 21. Second clamp beak; 22. Second clamp beak arm; 3. Pivot pivot; 4. Slide rail assembly; 41. Guide rail groove; 411. Limiting boss; 42. Slider; 421. T-shaped protrusion; 422. Threaded hole; 423. Buffer rubber block; 43. Operating knob; 43. Threaded rod; 5. Multi-link linkage assembly; 51. First link; 52. Second link; 53. Third link; 54. Short link; 55. Fixed bearing seat; 6. Anti-slip handle sleeve; 7. Scale markings; 8. Toothed pattern. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0025] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0026] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0027] The following is in conjunction with the appendix Figure 1-5 The present invention will now be described in further detail an embodiment of a tooth extraction forceps.

[0028] A type of tooth extraction forceps, such as Figure 1 , 2As shown, the device includes a split-type first clamp 1 and a second clamp 2. The front end of the first clamp 1 is connected to a first jaw 11, and the front end of the second clamp 2 is connected to a second jaw 21. The first jaw 11 and the second jaw 21 are hinged together by a pivot shaft 3. The first clamp 1 is provided with a linkage adjustment mechanism for adjusting the position of the pivot shaft 3. The linkage adjustment mechanism includes a slide rail assembly 4 for adjusting the distance between the first jaw 11 and the second jaw 21, and a multi-link linkage assembly 5 for driving the slide rail assembly 4 and the pivot bearing. The slide rail assembly 4 extends axially along the inner surface of the first clamp 1, and one end of the slide rail assembly 4 is movably connected to the multi-link linkage assembly 5. The multi-link linkage assembly 5 is connected between the pivot bearing and the slide rail assembly 4, and one end of the multi-link linkage assembly 5 is fixed to the second clamp 2. By manually operating the slide assembly to slide along the first clamp 1, the multi-link transmission assembly is driven to adjust the position of the support shaft, thereby changing the clamping pivot position of the second jaw 21 and the first jaw 11.

[0029] Specifically, when dealing with curved or fused roots, extraction forceps need to be used with different clamping positions and different force directions for extraction. This invention uses a linkage adjustment mechanism to adjust the movement position of the fulcrum shaft 3, which can adjust the clamping angle of the first jaw 11 and the second jaw 21, so that they can better fit the curved root. In this way, when applying force, it can be applied to the root more evenly, avoiding slippage or excessive pressure on the crown during extraction, thereby reducing the risk of crown breakage.

[0030] In this embodiment, as Figure 4 , 5 As shown, the slide rail assembly 4 includes a guide rail groove 41 formed on the surface of the first clamp handle 1, a slider 42 that can slide along the guide rail groove 41, and an operation knob 43 set on the slider 42; the vertical cross section of the guide rail groove 41 is T-shaped, the bottom end of the slider 42 is provided with a T-shaped protrusion 421 that cooperates with the guide rail groove 41, and the slider 42 is provided with a threaded hole 422; the bottom end of the operation knob 43 is provided with a threaded rod 43, and the operation knob 43 protrudes from the guide rail groove 41; the threaded rod is threadedly engaged with the threaded hole 422 on the slider 42, and the threaded rod 43 is connected to the multi-link linkage assembly 5 for transmission.

[0031] Specifically, when dealing with teeth of different shapes to be extracted (such as curved roots or fused roots), it is necessary to adjust the clamping fulcrum positions of the first jaw 11 and the second jaw 21. Taking a curved root tooth as an example, due to its special shape, the clamping fulcrum needs to be adjusted to a position that better conforms to the curvature of the curve in order to apply force better during extraction and reduce damage to the tooth. By manually rotating the operating knob 43, the rotation of the operating knob 43 drives the threaded rod 43 at the bottom to rotate. Because the threaded rod 43 is threadedly engaged with the threaded hole 422 on the slider 42, according to the principle of screw transmission, the rotation of the threaded rod 43 will be converted into the linear sliding of the slider 42 along the guide groove 41.

[0032] The T-shaped guide groove 41, in conjunction with the slider 42, structurally ensures the stability of the slider 42's sliding motion. Compared to other simple guide rail structures, the T-shaped structure of the guide groove 41 effectively restricts the movement direction of the slider 42, preventing it from shifting or derailing during sliding, thus providing a stable foundation for the entire adjustment process. The operating knob 43 protrudes from the guide groove 41, facilitating manual adjustment by the operator. This ergonomic design makes manual adjustment convenient. Compared to some complex electric adjustment devices, the manually adjustable operating knob 43 is more intuitive and convenient, allowing dentists to precisely control the adjustment force and range based on their operating habits and clinical experience. The scale markings 7 further assist the operator in quickly and accurately locating the slider 42, achieving precise adjustment of the clamping fulcrum, reducing adjustment time, and improving the overall efficiency of tooth extraction procedures.

[0033] It is worth noting that during tooth extraction, if complex situations arise, such as abnormal connections between the tooth and surrounding tissues or poor force feedback, the operator can fine-tune the fulcrum position as needed. Simply rotate the operating knob 43 again, and through the aforementioned adjustment principle, slightly adjust the position of the slider 42, thereby changing the clamping fulcrum and ensuring the smooth execution of the tooth extraction. This fine-tunable design greatly enhances the flexibility and adaptability of tooth extraction operations, enabling the handling of various complex clinical tooth extraction scenarios.

[0034] In this embodiment, as Figure 5 As shown, the guide rail groove 41 has limiting bosses 411 at both ends, and the slider 42 has buffer rubber blocks 423 on its side that cooperate with the limiting bosses 411.

[0035] Specifically, during the sliding process of slider 42, the limiting bosses 411 at both ends of guide rail groove 41 and the buffer rubber blocks 423 on the side of slider 42 play an important role. When slider 42 slides to the extreme positions at both ends of guide rail groove 41, the buffer rubber blocks 423 first contact the limiting bosses 411. The elastic deformation of the buffer rubber blocks 423 can absorb the kinetic energy of slider 42's movement, preventing slider 42 from directly colliding with the rigid limiting bosses 411 and damaging the components. At the same time, it can also prevent damage to structures such as multi-link linkage component 5 or fulcrum shaft 3 due to excessive sliding, ensuring the stability of the entire adjustment process and the service life of the components.

[0036] In this embodiment, as Figure 1 As shown, the multi-link linkage assembly 5 includes a first link 51, a second link 52, and a third link 53. One end of the first link 51 is connected to the threaded rod 43, and the other end is connected to the second link 52 via a short link 54. The two ends of the short link 54 are hinged to the first link 51 and the second link 52 respectively via hinge shafts. A fixed bearing seat 55 is provided at the connection between the second link 52 and the third link 53. The fixed bearing seat 55 is located on the arm of the second jaw 21 extending from the root of the second jaw 21 and is connected to the arm of the second jaw 21 by means of slots, bolts, etc., to ensure that the fixed bearing seat 55 achieves a stable rotational connection with the second link 52 and the third link 53 respectively. This rotational connection design allows the multi-link linkage assembly 5 to flexibly adjust the angle during transmission, adapt to the changes in the position of the slider 42, and thus accurately adjust the position of the fulcrum shaft 3.

[0037] Specifically, during the sliding of the slider 42 within the guide groove 41, motion is transmitted through the multi-link linkage assembly 5. The multi-link linkage assembly 5 employs a hinged and rotating connection design. This design allows for flexible angle adjustment during transmission, adapting to changes in the slider 42's position and ensuring smooth transmission and high-precision adjustment. Compared to traditional rigid transmission structures, the multi-link hinged transmission effectively disperses stress, reduces the load on individual transmission components, lowers the risk of component damage, and improves the reliability of the extraction forceps during frequent use.

[0038] In this system, the first link 51 moves along with the slider 42. Since the first link 51 and the short link 54, and the short link 54 and the second link 52 are all hinged, this multi-link hinged transmission method can transform the linear motion of the slider 42 into the complex planar motion of the multi-link assembly. The movement of the second link 52 drives the movement of the third link 53, which is connected to it through the fixed bearing seat 55. Ultimately, the third link 53 drives the fulcrum shaft 3 to slide along the guide groove 122 through the collar. The end of the third link 53 that is away from the second link 52 is fixedly connected to the fulcrum shaft 3 through the collar. The collar is designed to ensure a firm connection with the fulcrum shaft 3 while not affecting the sliding of the fulcrum shaft 3 in the guide groove 122, thus realizing the effective transmission control of the fulcrum shaft 3 by the multi-link linkage assembly 5.

[0039] In this embodiment, a perforation 121 and a guide groove 122 are machined on the jaw arm at the root of the first jaw 11. The perforation 121 is a central hole structure, used to allow the second jaw 21 to pass through, ensuring that the second jaw 21 can move stably within the perforation 121 and properly engage with the first jaw 11. The guide groove 122 extends axially along the surface of the jaw arm extending from the root of the first jaw 11, and is designed as an arc-shaped structure. Its arc trajectory is adapted to the movement requirements of the fulcrum pivot 3 during tooth extraction. The fulcrum pivot 3 passes through the guide groove 122, ensuring that the fulcrum pivot 3 can slide smoothly along the guide groove 122, providing track support for flexible adjustment of the fulcrum position.

[0040] In this embodiment, a guide groove 122 for guiding the pivot shaft 3 is also provided on the first jaw 11 arm extending from the root of the first jaw 11. The guide groove 122 extends axially along the surface of the first jaw 11 arm and has an arc-shaped structure. The pivot shaft 3 passes through the guide groove 122 and slides along the guide groove 122.

[0041] In this embodiment, the outer sides of the first clamp handle 1 and the second clamp handle 2 are fitted with anti-slip handle sleeves 6, and the first clamp handle 1 is engraved with scale markings 7 on one side of the guide rail groove 41.

[0042] Specifically, the anti-slip handle sleeve 6 is made of medical-grade materials, providing excellent anti-slip performance and comfort. It is fixed to the outer sides of the first clamp handle 1 and the second clamp handle 2 through interference fit or bonding. The application of the anti-slip handle sleeve 6 improves grip comfort and stability. Meanwhile, the scale markings 7 assist in the sliding distance of the slider 42, and the spacing and precision of the scale markings 7 are set according to actual adjustment needs, assisting the operator in accurately positioning the slider 42 during adjustment and improving adjustment accuracy.

[0043] It's worth noting that during tooth extraction, dentists need to hold the extraction forceps for extended periods. The anti-slip handle sleeve effectively reduces hand fatigue and increases grip stability, preventing operational errors caused by hand slippage. The different tooth patterns are specifically designed to fit different tooth shapes, allowing for better clenching during extraction, improving the success rate and safety of the extraction, and reducing problems such as tooth slippage and secondary damage caused by insecure gripping.

[0044] In this embodiment, the clamping surfaces of the first jaw 11 and the second jaw 21 are provided with teeth 8. The teeth 8 include arc-shaped teeth 8 for adapting to curved roots and large-pitch teeth 8 for adapting to fused roots. Different tooth 8 shapes can adapt to different root anatomical morphologies, thereby achieving a stable clamping effect.

[0045] The working principle of this new tooth extraction forceps:

[0046] Fulcrum adjustment: According to the shape of the tooth to be extracted (such as curved root, fused root), observe the scale mark 7, manually rotate the operation knob 43 to drive the threaded rod 43 to rotate, so that the slider 42 slides along the guide rail groove 41; the movement of the slider 42 drives the fulcrum shaft 3 to slide along the guide groove 122 through the multi-link linkage assembly 5, and adjusts the clamping fulcrum position of the first jaw 11 and the second jaw 21 to match the tooth shape.

[0047] Tooth extraction procedure: Hold the non-slip handle 6 and clamp the tooth with the first jaw 11 and the second jaw 21. Using the adjusted clamping fulcrum, apply force to extract the tooth. The fulcrum position can be finely adjusted as needed during the procedure to ensure smooth operation. Because the clamping fulcrum position is precisely adjusted, it better adapts to the tooth shape. Furthermore, based on the lever principle, the adjusted clamping fulcrum changes the lever arm length and the point of force application, allowing the operator to apply force to extract the tooth in a more effortless and precise manner.

[0048] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An extraction forceps comprising a first forceps handle and a second forceps handle in a split design, a first forceps beak connected to the front end of the first forceps handle, a second forceps beak connected to the front end of the second forceps handle, and the first forceps beak and the second forceps beak hinged through a fulcrum pivot, characterized in that, The first clamp handle is provided with a linkage adjustment mechanism for adjusting the position of the fulcrum pivot. The linkage adjustment mechanism includes a slide rail assembly for adjusting the distance between the first and second jaws and a multi-link linkage assembly for driving the slide rail assembly and the fulcrum bearing. The slide rail assembly extends axially along the inner surface of the first clamp handle, and one end of the slide rail assembly is movably connected to the multi-link linkage assembly. The multi-link linkage assembly is connected between the fulcrum bearing and the slide rail assembly, and one end of the multi-link linkage assembly is fixed to the second clamp handle. By manually operating the sliding assembly to slide along the first clamp handle, the multi-link transmission assembly is driven to adjust the position of the support pivot, thereby changing the clamping fulcrum position of the second and first jaws.

2. The tooth forceps according to claim 1, wherein The slide rail assembly includes a guide rail groove formed on the surface of the first clamp handle, a slider that can slide along the guide rail groove, and an operating knob disposed on the slider; the vertical cross-section of the guide rail groove is T-shaped, the bottom end of the slider is provided with a T-shaped protrusion that mates with the guide rail groove, and the slider is provided with a threaded hole; the bottom end of the operating knob is provided with a threaded rod, and the operating knob protrudes from the guide rail groove; the threaded rod is threadedly engaged with the threaded hole on the slider, and the threaded rod is connected to the multi-link linkage assembly for transmission.

3. The tooth forceps according to claim 2, wherein The guide rail groove is provided with limiting bosses at both ends, and the slider is provided with buffer rubber blocks that cooperate with the limiting bosses on its side.

4. The tooth forceps according to claim 1, wherein The multi-link linkage assembly includes a first link, a second link, and a third link. One end of the first link is connected to a threaded rod, and the other end is connected to the second link via a short link. The two ends of the short link are hinged to the first link and the second link respectively via hinge shafts. A fixed bearing seat is provided at the connection between the second link and the third link. The fixed bearing seat is located on the second jaw arm extending from the root of the second jaw, and is rotatably connected to both the second link and the third link. The end of the third link that is offset from the second link is fixedly connected to a fulcrum bearing by a collar.

5. The tooth forceps according to claim 1, wherein The first jaw arm, extending from the root of the first jaw, has a perforation with a central hole, through which the second jaw passes and engages with the first jaw.

6. The tooth forceps according to claim 5, wherein The first jaw arm extending from the root of the first jaw is also provided with a guide groove for guiding the pivot shaft. The guide groove extends axially along the surface of the first jaw arm and has an arc-shaped structure. The pivot shaft passes through the guide groove and slides along the guide groove.

7. The tooth forceps according to claim 1, wherein The first and second clamp handles are fitted with anti-slip handle sleeves on their outer sides, and the first clamp handle has scale markings engraved on one side of the guide rail groove.

8. The tooth forceps according to claim 1, wherein The clamping surfaces of the first and second jaws are provided with teeth, including arc-shaped teeth for adapting to curved roots and large-pitch teeth for adapting to fused roots.

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