crown remover

Abstract

The utility model relates to medical instrument technical field, concretely is crown pliers, including the first bending pliers and second bending pliners of arc surface opposite. The first bending pliers one end is equipped with the sharp mouth, and the second bending pliers corresponding end is equipped with the convex block with the threaded hole, and the threaded hole is installed with the screw rod with the round block, and the other end of screw rod is opened with the hexagonal groove. The other end of first bending pliers is connected with the middle part of first front clamping block, and the clamping block below is connected with the left side of first round plate, and the right side of first round plate is connected with first rear clamping block. The other end of second bending pliers is connected with the middle part of second front clamping block, and the clamping block above is connected with the right side of second round plate, and the left side of second round plate is connected with second rear clamping block. First round plate and second round plate are pasted and are connected through the dowel. The two rear clamping blocks are all equipped with the bent handle, and the bent handle sleeve has the rubber sleeve with the finger sleeve. When operating, hold and open and close the bent handle drive two round plates relative rotation to drive two bending pliers to open and close, make the sharp mouth and round block cooperate and complete the clamping action. The instrument can accurately control the clamping force stably and adjustably, and the safe disassembly of oral cavity prosthesis is convenient.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to crown removal forceps. Background Technology

[0002] Crown removal forceps are commonly used instruments in clinical dental restoration and orthodontic treatment. Their main function is to safely remove cemented crowns, temporary crowns, or orthodontic bands without damaging healthy tooth structure. During treatment, restorations often need to be completely removed due to replacement, repair, or the completion of a treatment phase. Therefore, using specialized instruments to achieve controlled and precise removal is a fundamental step in dental treatment.

[0003] Existing crown removal instruments typically have fixed clamping components, which are difficult to adapt flexibly to the specific shape and thickness of different restorations, potentially leading to unstable clamping or the need to apply excessive force. At the same time, the design of the contact surface at the working end may be relatively simple, making it difficult to achieve a stable and tissue-friendly force application method when dealing with restorations of some special shapes or locations. Utility Model Content

[0004] The purpose of this invention is to provide crown removal pliers to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: The crown removal pliers include a first curved plier and a second curved plier, with their curved surfaces facing each other. One end of the first curved plier, located on the curved surface, is a pointed tip, and one end of the second curved plier, also located on the curved surface, is a protrusion facing the pointed tip. The protrusion has a threaded hole, and a threaded rod is threadedly installed in the threaded hole. A round block is fixedly installed at one end of the threaded rod, and the round block fits against the protrusion. The other end of the threaded rod passes through the threaded hole, and a hexagonal groove is formed at the end of the threaded rod at the point of penetration.

[0006] Preferably, the other end of the first bending clamp is fixed to the middle of the first front clamping block, and the lower part of the side of the first front clamping block opposite to the first bending clamp is fixed to the left side of the first circular plate.

[0007] Preferably, the first circular plate is fixed on the side opposite to the first front clamping block and located to the right of that side and below the first rear clamping block, and the first front clamping block and the first rear clamping block are staggered.

[0008] Preferably, the other end of the second bending clamp is fixed to the middle of the second front clamping block, and the upper part of the second front clamping block opposite to the second bending clamp is fixed to the right side of the second circular plate.

[0009] Preferably, the second circular plate is fixed on the side opposite to the second front clamping block and on the left side of that side and above the second rear clamping block, and the second front clamping block and the second rear clamping block are staggered.

[0010] Preferably, the first circular plate and the second circular plate are attached together, and the first circular plate and the second circular plate are respectively provided with pin grooves on the same axis, and pins are installed coaxially in the pin grooves.

[0011] Preferably, the first front clamping block and the second front clamping block are adjacent to each other, and the first rear clamping block and the second rear clamping block are adjacent to each other. A curved handle is fixedly installed on the side of the first rear clamping block opposite to the first circular plate and the side of the second rear clamping block opposite to the second circular plate, respectively.

[0012] Preferably, the inner arc surfaces of the bend handles face each other, and rubber sleeves are respectively fitted on the bend handles. Finger sleeves are respectively fixedly installed on the side of the rubber sleeves opposite to the inner arc surface of the bend plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This crown removal forceps, through the relative arrangement of the pointed tip on the curved surface of the first curved forceps and the circular block on the protrusion of the second curved forceps, achieves precise wrapping and surface contact of the working end when closed. This provides a more stable and evenly distributed clamping force when removing restorations such as crowns, temporary crowns, or orthodontic bands, helping to reduce local stress concentration on the restoration itself and surrounding healthy tooth tissue during force application. It is particularly suitable for clinical scenarios requiring minimally invasive procedures, such as pediatric dentition. The forceps also features threaded holes on the protrusion, a threaded shank installed within, and a hexagonal groove at the end of the threaded shank. This allows the operator to adjust the circular block by screwing it in or out using standard tools, enabling fine-tuning of the clamping gap at the working end or quick replacement of the circular block accessory. This improves the instrument's clinical adaptability and maintenance convenience when handling restorations of different sizes and shapes. Attached Figure Description Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the overall disassembly of this utility model; Figure 3 This is a schematic diagram of the circular block structure of this utility model; Figure 4 This is a schematic diagram of the structure of the rubber sleeve of this utility model.

[0014] In the diagram: 101, First curved pliers; 102, Second curved pliers; 103, Pointed mouth; 104, Protrusion; 105, Threaded hole; 106, Threaded rod; 107, Round block; 108, Hexagonal slot; 109, First front clamping block; 110, First round plate; 111, Second front clamping block; 112, Second round plate; 113, First rear clamping block; 114, Second rear clamping block; 115, Pin groove; 116, Pin; 117, Curved handle; 118, Rubber sleeve; 119, Finger sleeve. Detailed Implementation

[0015] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-4 As shown, this utility model provides a technical solution: The crown removal pliers include a first curved pliers 101 and a second curved pliers 102, with the curved surfaces of the first curved pliers 101 and the second curved pliers 102 facing each other. One end of the first curved pliers 101, located on the curved surface, is designated as a pointed tip 103. One end of the second curved pliers 102, also located on the curved surface, is designated as a protrusion 104, with the protrusion 104 facing the pointed tip 103. A threaded hole 105 is provided on the protrusion 104, and a threaded rod 106 is threadedly installed in the threaded hole 105. A round block 107 is fixedly installed at one end of the threaded rod 106, and the round block 107 fits against the protrusion 104. The other end of the threaded rod 106 extends through the threaded hole 105, and a hexagonal groove 108 is provided at the end of the threaded rod 106 at the through-hole.

[0017] Through the above scheme, the bending contours of the working ends of the first and second bending clamps can cooperate to achieve wrapping and alignment of the target object; a fine end point for cutting or clamping is formed by the tip; a support platform corresponding to the tip is formed by the protrusion; a connection interface with internal threads is provided by the threaded hole; an adjusting rod that can be screwed into the interface and moved axially is formed by the threaded rod; a smooth spherical contact surface is formed at the end of the threaded rod by the round block, which is used to cooperate with the tip to complete surface contact clamping; by setting the round block to fit against the protrusion, the clamping force can be directly transmitted to the main structure of the second bending clamp through the protrusion; by passing through one end of the threaded rod and opening a hexagonal groove, it is easy to use a standard wrench to tighten, thereby controlling the advance and retreat of the round block.

[0018] In this embodiment, preferably, the other end of the first bending clamp 101 is fixed to the middle of the first front clamp 109, and the lower side of the first front clamp 109 opposite to the first bending clamp 101 is fixed to the left side of the first circular plate 110.

[0019] The above scheme provides a solid intermediate fixed fulcrum for the rear end of the first bending clamp by the first front clamp, enabling the first bending clamp to perform lever motion by using this fulcrum; the first circular plate receives the motion from the first front clamp and converts it into rotational motion.

[0020] In this embodiment, preferably, the first circular plate 110 is fixed on the side opposite to the first front clamping block 109 and located to the right of that side and below the first rear clamping block 113, and the first front clamping block 109 and the first rear clamping block 113 are arranged alternately.

[0021] Through the above scheme, the force generated when the operator holds the first rear clamping block is effectively transmitted to the first circular plate by the fixed connection between the first rear clamping block and the first circular plate, driving it to rotate; through the staggered arrangement of the first front clamping block and the first rear clamping block, the two are separated in space, leaving an independent and non-interfering operating position for the user's fingers to hold.

[0022] In this embodiment, preferably, the other end of the second bending clamp 102 is fixed to the middle of the second front clamp 111, and the upper part of the second front clamp 111 opposite to the second bending clamp 102 is fixed to the right side of the second circular plate 112.

[0023] The above scheme provides a solid intermediate fixed fulcrum for the rear end of the second bending clamp by the second front clamp, enabling the second bending clamp to perform lever motion by using this fulcrum; the second circular plate receives the motion from the second front clamp and converts it into rotational motion in the opposite direction to that of the first circular plate.

[0024] In this embodiment, preferably, the second circular plate 112 is fixed on the side opposite to the second front clamping block 111 and on the left side of that side and above the second rear clamping block 114, and the second front clamping block 111 and the second rear clamping block 114 are arranged alternately.

[0025] Through the above scheme, the force generated when the operator holds the second rear clamping block is effectively transmitted to the second circular plate by the fixed connection between the second rear clamping block and the second circular plate, driving it to rotate; through the staggered arrangement of the second front clamping block and the second rear clamping block, the two are staggered in space, leaving an independent and non-interfering operating position for the user's fingers to hold.

[0026] In this embodiment, preferably, the first circular plate 110 and the second circular plate 112 are attached together, and the first circular plate 110 and the second circular plate 112 are respectively provided with pin grooves 115 on the same axis, and pins 116 are coaxially installed in the pin grooves 115.

[0027] The above scheme ensures a stable contact surface during relative rotation of the first and second circular plates by making them fit together, thus preventing unnecessary shaking. Precisely aligned shaft holes are formed by coaxially opening pin grooves on the first and second circular plates. A pin passes through and is installed in the two pin grooves, pivotally connecting the first and second circular plates into a single unit and establishing their common axis of rotation.

[0028] In this embodiment, preferably, the first front clamping block 109 and the second front clamping block 111 are adjacent to each other, and the first rear clamping block 113 and the second rear clamping block 114 are adjacent to each other. The side of the first rear clamping block 113 opposite to the first circular plate 110 and the side of the second rear clamping block 114 opposite to the second circular plate 112 are respectively fixedly installed with a curved handle 117.

[0029] The above scheme allows the first and second front clamps to be adjacent to each other, forming the thumb grip area at the front of the device; the first and second rear clamps to be adjacent to each other, forming the remaining finger grip area at the rear of the device; and the curved handle is fixed to the two rear clamps respectively, which extends the lever arm of the grip, making operation more effortless and improving grip comfort and force direction.

[0030] In this embodiment, preferably, the inner arc surfaces of the bend handle 117 are opposite to each other, and rubber sleeves 118 are respectively fitted on the bend handle 117. Finger sleeves 119 are respectively fixedly installed on the side of the rubber sleeve 118 opposite to the inner arc surface of the bend plate.

[0031] The above solution creates a concave grip surface that conforms to the natural curvature of human fingers by aligning the inner curved surfaces of the handles. A rubber sleeve covers the surface of the handles, increasing friction during gripping and providing cushioning and shock absorption. Finger sleeves are fixed to the outside of the rubber sleeve, providing clear positioning and constraint for the operator's fingers, ensuring stable hand posture and direct power transmission during operation.

[0032] In this embodiment of the crown removal pliers, the operator places their fingers into the finger sleeves 119 fixed to the rubber sleeves 118. The rubber sleeves 118 are tightly fitted onto the curved handles 117, which are fixedly mounted on the first rear clamping block 113 and the second rear clamping block 114. When removing the crown, the operator applies force with their fingers, causing the first rear clamping block 113 and the second rear clamping block 114 to move closer together via the fixed curved handles 117 and the rubber sleeves 118. At the same time, the first front clamping block 109 and the second front clamping block 111, which are in contact with the operator's thumb, also move accordingly.

[0033] This gripping action constitutes the initial input for the motion. The movement of the first rear clamping block 113 is directly transmitted to the first circular plate 110 through its connection with the lower fixed point of the first circular plate 110, causing the first circular plate 110 to rotate around a core axis. Similarly, the movement of the second rear clamping block 114 is directly transmitted to the second circular plate 112 through its connection with the upper fixed point of the second circular plate 112, causing the second circular plate 112 to rotate in the opposite direction around the same axis. The key to enabling this relative and opposite rotation of the first circular plate 110 and the second circular plate 112 lies in their contact with each other and their connection by pins 116 coaxially installed in their respective pin slots 115. The pins 116 form a common axis of rotation for both, ensuring the coaxiality and stability of the motion.

[0034] The rotational motion of the first circular plate 110 is converted into the displacement of the first front clamp 109 through its fixed connection with the left side of the first front clamp 109. Since the middle part of the first curved clamp 101 is fixed to the first front clamp 109, the displacement of the first front clamp 109 drives the first curved clamp 101 to swing with its connection point with the first front clamp 109 as the fulcrum. Completely symmetrically, the reverse rotation of the second circular plate 112 is converted into the displacement of the second front clamp 111 through its fixed connection with the right side of the second front clamp 111, and drives the second curved clamp 102 to swing in the opposite direction with its connection point with the second front clamp 111 as the fulcrum.

[0035] Therefore, the opening and closing of the tail portions of the first curved clamp 101 and the second curved clamp 102, respectively, through the opening and closing of the gripping portions formed by the first front clamping block 109, the first rear clamping block 113, the second front clamping block 111, and the second rear clamping block 114, is precisely translated into the opening and closing of their working heads. The pointed tip 103 at one end of the curved surface of the first curved clamp 101 and the round block 107 on the protrusion 104 at one end of the curved surface of the second curved clamp 102 subsequently move towards or away from each other. Because the curved surfaces of the first curved clamp 101 and the second curved clamp 102 are arranged opposite each other, when the pointed tip 103 and the round block 107 approach each other, they can stably contact and clamp the target object from opposite directions. This composite lever mechanism, which uses the rotation of a circular plate to drive the swinging of the pliers, focuses the relatively broad gripping force of the hand and transforms it into a fine and controllable micro-displacement and clamping force at the working end. It is particularly suitable for crown replacement after denture restoration, removal of temporary crowns, and fine disassembly of orthodontic bands. Its fine control characteristics are especially in line with the high requirements for force and precision in minimally invasive procedures for pediatric dentistry.

[0036] The adjustability and replaceability of the working end block 107 further enhance the instrument's adaptability. The block 107 is fixed to one end of the threaded rod 106, which is screwed into the threaded hole 105 on the protrusion 104. By inserting a tool into the hexagonal groove 108 at the other end of the threaded rod 106 and rotating it, the threaded rod 106 can be driven to move forward and backward in the threaded hole 105, thereby moving the block 107 closer to or further away from the protrusion 104, achieving fine-tuning of the clamping gap. If the threaded rod 106 is completely unscrewed, the block 107 can be removed and replaced. This design allows for targeted adjustments or replacement of parts according to the shape and size of different prostheses in clinical practice.

[0037] In the entire power transmission chain, the rubber sleeve 118 fitted onto the curved handle 117 provides the fingers with a flexible cushioning and a high-friction grip surface, while the finger sleeve 119 fixed to the rubber sleeve 118 restrains the operator's fingers in an ideal operating position, together ensuring stable, comfortable, and efficient force application and reducing the possibility of slippage and hand fatigue. From the fingers, finger sleeves 119, rubber sleeves 118, curved handle 117, rear clamp, to the round plate, pin 116, front clamp, curved pliers, and finally to the tip 103, protrusion 104, threaded rod 106, and round block 107, all components are interlocked and work together to accurately and reliably convert human power into directional mechanical force suitable for removal operations in the confined space of the oral cavity. While effectively completing the removal task, it strives to minimize interference with surrounding healthy tissues.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. Crown removal pliers, comprising a first curved pliers (101) and a second curved pliers (102), characterized in that: The curved surfaces of the first bending pliers (101) and the second bending pliers (102) are opposite each other. One end of the first bending pliers (101) located on the curved surface is set as a pointed tip (103). One end of the second bending pliers (102) located on the curved surface is set as a protrusion (104), and the protrusion (104) is opposite to the pointed tip (103). A threaded hole (105) is provided on the protrusion (104). A threaded rod (106) is installed in the threaded hole (105) by thread. A round block (107) is fixedly installed at one end of the threaded rod (106). The round block (107) fits against the protrusion (104). The other end of the threaded rod (106) passes through the threaded hole (105), and a hexagonal groove (108) is provided at the end of the threaded rod (106) located at the through hole.

2. The crown removal pliers according to claim 1, characterized in that: The other end of the first curved clamp (101) is fixed to the middle of the first front clamp (109), and the lower side of the first front clamp (109) opposite to the first curved clamp (101) is fixed to the left side of the first circular plate (110).

3. The crown removal pliers according to claim 2, characterized in that: The first circular plate (110) is fixed on the side opposite to the first front clamping block (109) and located to the right of that side and below the first rear clamping block (113). The first front clamping block (109) and the first rear clamping block (113) are staggered.

4. The crown removal pliers according to claim 3, characterized in that: The other end of the second bending clamp (102) is fixed to the middle of the second front clamp (111), and the upper part of the second front clamp (111) opposite to the second bending clamp (102) is fixed to the right side of the second circular plate (112).

5. The crown removal pliers according to claim 4, characterized in that: The second circular plate (112) is fixed on the side opposite to the second front clamping block (111) and on the left side of that side above the second rear clamping block (114). The second front clamping block (111) and the second rear clamping block (114) are arranged alternately.

6. The crown removal pliers according to claim 5, characterized in that: The first circular plate (110) and the second circular plate (112) are fitted together. The first circular plate (110) and the second circular plate (112) are respectively provided with pin grooves (115) on the same axis. A pin (116) is coaxially installed in the pin groove (115).

7. The crown removal pliers according to claim 6, characterized in that: The first front clamping block (109) and the second front clamping block (111) are adjacent to each other, and the first rear clamping block (113) and the second rear clamping block (114) are adjacent to each other. The first rear clamping block (113) is fixedly installed on the side opposite to the first circular plate (110), and the second rear clamping block (114) is fixedly installed on the side opposite to the second circular plate (112).

8. The crown removal pliers according to claim 7, characterized in that: The inner arc surfaces of the bend handle (117) are opposite each other, and rubber sleeves (118) are respectively fitted on the bend handle (117). Finger sleeves (119) are respectively fixedly installed on the side of the rubber sleeve (118) opposite to the inner arc surface of the bend plate.

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