Large-angle quantitative bending rod bender

Abstract

Provided is a large-angle quantitative bending rod bender, which comprises: a fixed handle (1) and a movable handle (2) that are connected to a pivot shaft (3), wherein the fixed handle (1) and the movable handle (2) are respectively located on two sides of the pivot shaft (3) and are pivotally connected by means of the pivot shaft (3); the pivot shaft (3) disposed on the fixed handle (1) and the movable handle (2); bending arms, comprising a first bending arm (4) that moves synchronously with the fixed handle (1) and a second bending arm (5) that moves synchronously with the movable handle (2), wherein the second bending arm (5) and the movable handle (2) are respectively located on the two sides of the pivot shaft (3), and the first bending arm (4) and the second bending arm (5) are pivotally connected by means of the pivot shaft (3); and a shift disc (6) disposed between the fixed handle (1) and the movable handle (2), comprising engaging teeth (8) disposed on the pivot shaft (3), stop blocks (7) that are fixedly connected to the fixed handle (1) by means of pin shafts (7-2, 7-3) and are oppositely disposed on the two sides of the pivot shaft (3), and sliding grooves (6-1) that are oppositely disposed on the two sides of the pivot shaft (3) and are both inclined inward, wherein the stop blocks (7) are pivotally connected to the sliding grooves (6-1) by means of the pin shafts (7-2, 7-3). When the rod bender performs large-angle bending of a connecting rod, the connecting rod can be bent to a precise angle.

Description

A large-angle quantitative bending rod bending machine

[0001] This patent application claims priority to the following Chinese patent application:

[0002] Submission Date: October 15, 2024; Application Number: 202411438338.5; Invention Title: A Large-Angle Quantitative Bending Rod Bending Device;

[0003] The full text of the above application is incorporated herein by reference. Technical Field

[0004] This invention belongs to the field of medical devices, and specifically relates to a large-angle quantitative bending rod device. Background Technology

[0005] Posterior spinal rod-and-screw internal fixation is a primary treatment for spinal orthopedic diseases. To conform to the physiological curvature of the human spine, the connecting rod needs to be bent and shaped during the procedure. Due to individual differences in physiological curvature, the required bending angle of the connecting rod varies. Therefore, instruments capable of quantitatively controlling the bending angle and arc are needed to meet the clinical requirements of the surgery. This is especially true in spinal deformity correction surgery, where patients have varying degrees of spinal deformity and the connecting rod requires large-angle bending and shaping. Furthermore, the quantitative control during the bending process is even more stringent; otherwise, excessive retraction during surgery can lead to a decrease in the fatigue life of the connecting rod, ultimately resulting in clinical accidents. Summary of the Invention

[0006] The present invention is proposed based on the above-mentioned needs of the prior art. The technical problem to be solved by the present invention is to bend the connecting rod to a precise angle when bending the plastic connecting rod at a large angle.

[0007] To address the aforementioned problems, the present invention provides a large-angle quantitative bending rod device, comprising: a handle, the handle including a fixed handle pivotally connected to a pivot, and a movable handle fixedly connected to the pivot, the fixed handle and the movable handle being pivotally connected via the pivot, the fixed handle and the movable handle being located on opposite sides of the pivot; a pivot, disposed on the fixed handle and the movable handle; and a bending arm, the bending arm including a first bending arm that moves synchronously with the fixed handle, and a second bending arm that moves synchronously with the movable handle, the second bending arm and the movable handle being located on opposite sides of the pivot, the first bending arm and the second bending arm being pivotally connected via the pivot.

[0008] Preferably, a first retaining seat is provided at the free end of the first bending arm, and a second retaining seat is provided at the free end of the second bending arm. The first retaining seat holds a first part of the connecting rod, and the second retaining seat holds a second part of the connecting rod.

[0009] Preferably, glass beads are provided on the first bent arm, and glass bead limiting grooves are provided on the shift plate, with the glass beads and the limiting grooves cooperating with each other.

[0010] Preferably, the glass bead limiting groove includes a first limiting groove, a second limiting groove, and a third limiting groove. When the glass bead engages with the first limiting groove, the shift disc is in a locked position; when the glass bead engages with the second limiting groove, the shift disc is in a left-hand rotation position; and when the glass bead engages with the third limiting groove, the shift disc is in a right-hand rotation position.

[0011] Preferably, a glass bead is provided on the second bent arm, and a glass bead limiting groove is provided on the pivot. The glass bead and the limiting groove cooperate with each other, and the second bent arm and the pivot are plugged and inserted into each other.

[0012] Preferably, a rotating pointer is provided on the second bent arm, and scale lines are provided on the first bent arm.

[0013] Preferably, the rotating pointer includes a first rotating pointer and a second rotating pointer. The first rotating pointer points to the scale line to indicate the angle of bending the connecting rod when the second bending arm rotates clockwise and bends the connecting rod in a clockwise direction. The second rotating pointer points to the scale line to indicate the angle of bending the connecting rod when the second bending arm rotates counterclockwise and bends the connecting rod in a counterclockwise direction.

[0014] Preferably, the large-angle quantitative bending rod bending device further includes a shift disc, which is disposed between the fixed handle and the movable handle. The shift disc has a locking position, a left-hand rotation position, and a right-hand rotation position. The shift disc includes: a retaining tooth disposed on the pivot; a stop block fixedly connected to the fixed handle by a pin, the stop block including a first stop block and a second stop block, the first and second stop blocks being disposed opposite to each other on both sides of the pivot; and a sliding groove including a first sliding groove and a second sliding groove, the first and second sliding grooves being disposed opposite to each other on the pivot. On both sides of the pivot, the upper parts of the first and second slide grooves are inclined inward. The first stop is pivotally connected to the first slide groove by a pin, and the second stop is pivotally connected to the second slide groove by a pin. In the locked position, the first and second stops hold the locking teeth from the left and right sides. In the left-hand position, the first stop holds the left side of the locking teeth, and the second stop separates from the right side of the locking teeth. In the right-hand position, the first stop separates from the left side of the locking teeth, and the second stop holds the right side of the locking teeth.

[0015] Preferably, the first stop and the second stop include a first part and a second part, the first pin passes through the first part and is disposed in a blind hole on the end face of the first bent arm near the shift disc; the second pin passes through the second part and is disposed in the slide groove.

[0016] Preferably, a torsion spring is provided on the first pin shaft on the first stop and the second stop.

[0017] Compared with the prior art, the bent connecting rod of the present invention can conform as closely as possible to the physiological curvature of the patient's corrected spine, thereby ensuring reasonable coordination between the various correction components, better distributing the load, reducing stress concentration, and thus improving the stability and safety of the spine support, achieving better treatment results. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 is a front view of the large-angle quantitative bending rod bending device according to a specific embodiment of the present invention.

[0020] Figure 2 is a structural diagram of the first card holder in a specific embodiment of the present invention;

[0021] Figure 3 is a structural diagram of the shift disc in a specific embodiment of the present invention;

[0022] Figure 4 is a structural diagram of the shift disc in the locked position in a specific embodiment of the present invention;

[0023] Figure 5 is a structural diagram of the shift disc in the left-hand rotation position in a specific embodiment of the present invention;

[0024] Figure 6 is a structural diagram of the shift disc in the right-hand rotation position in a specific embodiment of the present invention;

[0025] Figure 7 is a structural diagram of the stop block in a specific embodiment of the present invention;

[0026] Figure 8 is a structural diagram of the glass beads in the first bent arm in a specific embodiment of the present invention;

[0027] Figure 9 is a structural diagram of the rotating pointer in a specific embodiment of the present invention.

[0028] Reference numerals: 1. Fixed handle; 2. Movable handle; 3. Pivot; 4. First bending arm; 4-1. First card seat; 4-2. First card slot; 4-3. First fixing member; 4-4. Glass bead; 5. Second bending arm; 5-1. Second card seat; 5-2. Second card slot; 5-3. Second fixing member; 6. Gear shifter; 6-1. Slide groove; 6-2. Glass bead limiting groove; 6-2-1. First limiting groove; 6-2-2. Second limiting groove; 6-2-3. First limiting groove; 7. Stop block; 7-1. Stop block body; 7-2. First pin; 7-3. Second pin; 7-4. Torsion spring; 8. Gear; 9. Rotating pointer; 9-1. First rotating pointer; 9-2. Second rotating pointer; 10. Gear position pointer; 11. Scale line. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention 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, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a direct connection; or it can be an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0031] The terms “at the bottom of”, “at the top of”, and “on” used throughout the text refer to the relative positions of the components of the device, regardless of their orientation in space.

[0032] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0033] In surgical treatment of spinal orthopedic diseases, such as scoliosis, the curved spine is typically corrected to a normal alignment. Then, it is fixed to the spine using a combination of connecting rods and screws to maintain the corrected spine's normal shape. These connecting rods provide necessary support to the spine, helping it remain stable after correction. This results in a more stable spine after correction, reducing the risk of recurrence.

[0034] However, due to differences in the physiological curvature of the individual spine, the required bending angle of the connecting rod varies. Therefore, it is necessary to bend the connecting rod quantitatively to meet the clinical needs of the surgery.

[0035] Furthermore, since excessive bending of the connecting rod can easily lead to a decrease in its fatigue life, the quantitative bending degree during the bending process requires higher precision. The precise bending degree of the connecting rod ensures that the bent rod conforms as closely as possible to the physiological curvature of the patient's corrected spine, thereby ensuring proper coordination between the various corrective components, better load distribution, reduced stress concentration, and thus improved stability and safety of the supported spine, achieving better therapeutic results.

[0036] Therefore, this specific embodiment provides a large-angle quantitative bending rod bending tool, which can bend and shape the connecting rod at a large angle while also bending it to a precise angle. The structure of the large-angle quantitative bending rod bending tool is shown in Figure 1, and it includes a handle, a pivot, and a bending arm.

[0037] The structure of the large-angle quantitative bending rod bending device is shown in Figure 1. The handle includes a fixed handle 1 and a movable handle 2. The top ends of the fixed handle 1 and the movable handle 2 are pivotally connected by a pivot 3, allowing the movable handle 2 to rotate relative to the fixed handle 1 around the pivot 3. Specifically, the movable handle 2 can be fixedly connected to the pivot 3, while the fixed handle 1 is pivotally connected to the pivot 3. Further, the movable handle 2 and the fixed handle 1 can be arranged in a front-back direction. The top end of the fixed handle 1 is provided with a shaft hole, and the pivot 3 is disposed in the shaft hole to provide a rotational connection between the fixed handle 1 and the pivot 3. Even further, the pivot 3 can also be connected to the shaft hole via a bearing for smoother rotation.

[0038] Both the fixed handle 1 and the movable handle 2 have a gripping part at their lower ends. The shape of the gripping part is adapted to the human hand. For example, it is set to be wider at the corresponding position in the middle of the hand to facilitate a firm grip and thus stably transmit the force to the arm. The wider shape of the gripping part can be achieved by a rubber sleeve.

[0039] The top of the fixed handle 1 is fixedly connected to a first bending arm 4, and the top of the movable handle 2 is connected to a second bending arm 5. The second bending arm 5 and the movable handle 2 are located on opposite sides of the pivot 3. The first bending arm 4 moves synchronously with the fixed handle 1, and the second bending arm 5 moves synchronously with the movable handle 2. When the fixed handle 1 and the movable handle 2 rotate relative to each other, they drive the first bending arm 4 and the second bending arm 5 to move accordingly, thus forming two levers with the pivot 3 as the fulcrum. The length of the fixed handle 1 is greater than the length of the first bending arm 4, and the length of the movable handle 2 is greater than the length of the second bending arm 5, making it easier to bend the connecting rod using the first bending arm 4 and the second bending arm 5.

[0040] The first bending arm 4 and the second bending arm 5 have fixed ends and free ends. The fixed ends of the first bending arm 4 and the second bending arm 5 are pivotally connected by a pivot 3, so that the second bending arm 5 can rotate relative to the first bending arm 4 about the pivot 3. Furthermore, the second bending arm 5 can be plugged into and installed with the pivot 3 in the front-back direction. At the same time, it is detachably fixed to the pivot 3 by cooperating with the glass bead limiting groove on the pivot 3 through glass beads. Different specifications of second bending arms 5 can be replaced. Different specifications of second bending arms 5 have different turning radii, which can easily bend connecting rods with different bending angle requirements.

[0041] The free end of the first bending arm 4 is provided with a first retainer 4-1, which is rotatable relative to the free end of the first bending arm 4. The free end of the second bending arm 5 is provided with a second retainer 5-1, which is rotatable relative to the free end of the second bending arm 5. The first retainer 4-1 holds the first part of the connecting rod, and the second retainer 5-1 holds the second part of the connecting rod, thereby holding the connecting rod on the first bending arm 4 and the second bending arm 5.

[0042] Specifically, taking the first card holder 4-1 as an example, as shown in Figure 2, the first card holder 4-1 is provided with a first card slot 4-2. The first card slot 4-2 penetrates the first card holder 4-1 in a direction parallel to the first bending arm 4, and the first card slot 4-2 has a forward-facing opening and two side openings formed by penetrating the first card holder 4-1. The size of the two side openings of the first card slot 4-2 is larger than the size of the central space of the first card slot 4-2, thereby facilitating the smooth insertion of the connecting rod into the first card slot 4-2. That is, the connecting rod enters from one side opening of the first card slot 4-2, passes through the central space of the first card slot 4-2, and exits from the other side opening. During this process, while holding the first part of the connecting rod in the central position of the first card slot 4-2, space is also reserved for the bending deformation of the connecting rod, so that the part of the connecting rod covered by the two sides of the first card slot 4-2 can form a smooth curvature during bending, so that the curvature of the connecting rod conforms as closely as possible to the physiological curvature of the human body. Furthermore, the opening size of the first slot 4-2 facing forward is small, while the internal space of the first slot 4-2 is large, which prevents the connecting rod from coming out of the first slot 4-2 and increases the safety when bending the connecting rod.

[0043] The second card holder 5-1 is provided with a second card slot 5-2. The second card slot 5-2 has the same structure as the first card slot 4-2, which will not be described in detail here.

[0044] The first card holder 4-1 connects to the free end of the first bent arm 4 by cooperating with the first fixing member 4-3. When the cooperation between the first card holder 4-1 and the first fixing member 4-3 is released, the first card holder 4-1 can rotate relative to the first bent arm 4, thereby aligning one of the openings on both sides of the first card slot 4-2 and the second card slot 5-2. The connecting rod can then pass through the first card slot 4-2 and the second card slot 5-2 in sequence, and then the first card holder 4-1 is fastened to the first fixing member 4-3. Similarly, the second card holder 5-1 connects to the free end of the second bent arm 5 by cooperating with the second fixing member 5-3. The shape of the second fixing member 5-3 is the same as that of the first fixing member 4-3, and will not be described further here.

[0045] Furthermore, taking the first fixing member 4-3 as an example, the first fixing member 4-3 is preferably formed as a bolt, thereby providing a larger biting force to fix the first card seat 4-1 to the free end of the first bending arm 4, preventing the first card seat 4-1 from becoming loose relative to the first bending arm 4 when the fixed handle 1 and the movable handle 2 are squeezed to drive the first bending arm 4 and the second bending arm 5 to rotate relative to each other to bend the connecting rod, thus maintaining the stability of the connection between the first card seat 4-1 and the first bending arm 4.

[0046] Furthermore, taking the first card holder 4-1 as an example, the first card holder 4-1 has a forward protrusion relative to the first bending arm 4, and the first card slot 4-2 is disposed on the side of the first card holder 4-1 away from the first bending arm 4. The protrusion ensures that the first card slot 4-2 holding the connecting rod is at a distance from the first bending arm 4 in the front-back direction, and the second card holder 5-1 also has a forward protrusion relative to the first bending arm 4. This further ensures that the connecting rod held on the bender is at a distance from the first bending arm 4 and the second bending arm 5 in the front-back direction, thereby preventing the first bending arm 4 and the second bending arm 5 from interfering with the connecting rod during the bending process, thus affecting the accurate bending of the connecting rod. On the other hand, the protrusion makes the first card holder 4-1 and the second card holder 5-1 have the same position in the front-back direction, thereby limiting the connecting rod in the vertical plane formed by extending in the left-right and up-down directions. When the load applied to the handle is transmitted to the first card holder 4-1 and the second card holder 5-1, it is convenient to accurately bend the connecting rod to the required angle.

[0047] In this specific embodiment, since the first bending arm 4 moves synchronously with the fixed handle 1 and the second bending arm 5 moves synchronously with the movable handle 2, when the fixed handle 1 and the movable handle 2 are squeezed together, the movable handle 2 drives the second bending arm 5 to rotate relative to the first bending arm 4 through the pivot 3, and the connecting rod is subjected to force and bends accordingly.

[0048] Furthermore, the distance between the movable handle 2 and the second bending arm 5 in the front-back direction is greater than the distance between the first bending arm 4 and the second bending arm 5, thereby forming a space in the front-back direction to accommodate the shift disc 6 for accommodating the directional bending connecting rod.

[0049] The shift disc 6 is used for directional bending of the connecting rod, that is, bending the connecting rod in different directions by using different gears. Furthermore, if it is necessary to fold back to correct the bending angle of the connecting rod, the bending angle of the connecting rod can be adjusted by switching the gears of the shift disc, thereby correcting the bending angle of the connecting rod to the required angle, without having to disassemble the connecting rod and then reinstall it in reverse.

[0050] Specifically, the shift disc 6 is connected to the pivot 3, as shown in Figure 3. The shift disc 6 is rotated to change gears, including a locked gear, a left-hand rotation gear, and a right-hand rotation gear. Furthermore, to more clearly indicate to the operator which gear the bending device is in, a gear pointer 10 is preferably provided on the first bending arm 4 at a position corresponding to the gear. The gear pointer 10 pointing to different gears indicates that the bending device is in the corresponding gear, at which point the bending device can only perform bending operations in the corresponding gear.

[0051] When the fixed handle 1 and the movable handle 2 are pinched at different gear positions, the second bending arm 5 can be driven to rotate relative to the first bending arm 4 around the pivot 3 in a specific direction, thereby bending the connecting rod in a preset direction. This avoids the connecting rod bending shape deviating from the surgical requirements and causing it to fold back, reducing the impact on the quality of the connecting rod due to incorrect bending direction.

[0052] The shift disc 6 is provided with a stop block 7 and a gear 8. The stop block 7 is disposed opposite to each other on both sides of the shift disc 6. The gear 8 is fixedly connected to the pivot 3. The gear 8 moves synchronously with the pivot 3. The stop block 7 is distributed on both sides of the gear 8. The shift disc 6 is rotated to engage or disengage the two side stops 7 from the gear 8. When both side stops 7 are engaged with the gear 8, the stop 7 restricts the rotation of the gear 8, thereby restricting the rotation of the pivot 3. At this time, the bending device is in the locked position and cannot bend the connecting rod, as shown in Figure 5. When the left side stop 7 is engaged with the gear 8 and the right side stop 7 is disengaged from the gear 8, the stop 7 restricts the gear 8 from rotating clockwise, thereby restricting the rotation of the pivot 3 clockwise. At this time, the bending device is in the left-hand rotation position and can only bend the connecting rod counterclockwise, as shown in Figure 6. When the left side stop 7 is disengaged from the gear 8 and the right side stop 7 is engaged with the gear 8, the stop 7 restricts the gear 8 from rotating counterclockwise, thereby restricting the rotation of the pivot 3 clockwise. At this time, the bending device is in the right-hand rotation position and can only bend the connecting rod clockwise, as shown in Figure 7.

[0053] The shift disc 6 has a shaft hole in the middle, and the pivot 3 is disposed in the shaft hole. Preferably, an O-ring rubber washer is disposed between the shaft hole of the shift disc 6 and the pivot 3 to prevent wear.

[0054] As shown in Figure 7, the stop block 7 includes a stop block body 7-1, a first pin 7-2, and a second pin 7-3. The first pin 7-2 is disposed in a through hole in the first part of the stop block body 7-1 along the front-rear direction, and then in a blind hole on the end face of the first bent arm 4 near the gear shift disc 6. The second pin 7-3 is disposed in a through hole in the second part of the stop block body 7-1 along the front-rear direction, and then in a groove 6-1 on the gear shift disc 6 near the first bent arm 4. The groove 6-1 is disposed opposite to both sides of the pivot 3, and the upper part of the groove 6-1 is inclined inward, meaning the distance between the upper part of the groove 6-1 and the gear 8 is less than the distance between the lower part of the groove 6-1 and the gear 8.

[0055] Preferably, a torsion spring 7-4 may be provided on the first pin 7-2, and an opening for accommodating the torsion spring 7-4 may be provided on the stop body 7-1.

[0056] When the shift disc 6 is rotated to the locked position, the gear pointer 10 points to the locked position, and the shift disc 6 is in a locked state, which means the bending device is in a locked state. At this time, the state of the internal components of the shift disc 6 is as shown in Figure 4. The stop block 7 is in the first position, that is, the second pin shaft 7-3 is located in the middle of the slide groove 6-1. The stop block 7 holds the gear 8 from the left and right sides, and restricts the gear 8 from rotating in a clockwise or counterclockwise direction from the left and right sides. As a result, the gear 8 cannot rotate, and therefore cannot drive the second bending arm 5 to rotate. At this time, the bending device is locked and cannot bend the connecting rod.

[0057] When the shift disc 6 is in the locked position, rotating it counterclockwise switches the gear position pointer 10 from pointing to the locked position to pointing to the left-hand rotation position. When the shift disc 6 is switched to the left-hand rotation position, the state of the internal components of the shift disc 6 is shown in Figure 5. During this switching process, the slide groove 6-1 in the shift disc 6 drives the stop block 7 from the first position to the second position via the second pin 7-3. The second position is where the left second pin 7-3 is located at the upper limit of the left slide groove 6-1. In the second position, the second part of the left stop block 7 engages with the left side of the gear 8, and the second part of the right stop block 7 separates from the right side of the gear 8. At this time, the distance from the center of gravity of the left stop block 7 to the engagement point of the second part of the left stop block 7 with the gear 8 is greater than the distance from the center of gravity of the stop block 7 to other positions of the second part of the left stop block 7. Therefore, in the second position, the stop 7 restricts the gear 8 from rotating clockwise, thereby restricting the pivot 3 from rotating clockwise. At this time, the bender is in the left-hand rotation position and can only bend the connecting rod in the counterclockwise direction.

[0058] When the shift disc 6 is in the locked position, a load is applied to rotate the shift disc 6 clockwise, and the gear pointer 10 switches from pointing to the locked position to pointing to the right-hand drive position. When the shift disc 6 switches to the right-hand drive position, the state of the internal components of the shift disc 6 is shown in Figure 6. During this switching process, the slide groove 6-1 in the shift disc 6 drives the stop block 7 from the first position to the third position via the second pin 7-3. The third position is where the left second pin 7-3 is at its upper limit position on the left slide groove 6-1, and the right second pin 7-3 is at its lower upper limit position on the right slide groove 6-1. In the third position, the second part of the left stop block 7 separates from the gear 8, while the second part of the right stop block 7 engages with the gear 8. At this time, the distance from the center of gravity of the right stop block 7 to the engagement point of the second part of the right stop block 7 with the gear 8 is greater than the distance from the center of gravity of the stop block 7 to other positions of the second part of the right stop block 7. Therefore, in the third position, the stop 7 restricts the gear 8 from rotating counterclockwise, thereby restricting the pivot 3 from rotating counterclockwise. At this time, the bender is in the right-hand rotation position and can only bend the connecting rod in the clockwise direction.

[0059] Preferably, a glass bead limiting groove 6-2 is provided on the plane of the shift disc 6 near the first bent arm 4. The glass bead limiting groove 6-2 cooperates with a glass bead 4-4 at a corresponding position on the plane of the first bent arm 4 near the shift disc 6, as shown in Figure 8. Specifically, when the shift disc 6 is in the locked position, the glass bead 4-4 cooperates with the first limiting groove 6-2-1 located in the middle; when the shift disc 6 is in the left-hand position, the glass bead 4-4 cooperates with the second limiting groove 6-2-2 located on the left; when the shift disc 6 is in the right-hand position, the glass bead 4-4 cooperates with the third limiting groove 6-2-3 located on the right, to prevent incomplete gear shifting when changing gears of the shift disc 6, which would affect the engagement effect between the stop block 7 and the gear 8.

[0060] Furthermore, a rotating pointer 9 and a scale line 11 are provided at the position where the second bending arm 5 rotates relative to the first bending arm 4. The rotating pointer 9 is provided on the second bending arm 5, and the scale line 11 is provided on the first bending arm 4. Correspondingly, the scale line 11 can also be provided on the second bending arm 5, while the rotating pointer 9 rotates on the first bending arm 4. The rotating pointer 9 points to a mark in the scale line 11, indicating the angle of rotation of the second bending arm 5 relative to the first bending arm, which is the angle at which the connecting rod is bent. Furthermore, at the position where the second bending arm 5 rotates relative to the first bending arm 4, the rotating pointer 9 preferably has a first rotating pointer 9-1 and a second rotating pointer 9-2, as shown in Figure 9. The first rotating pointer 9-1 displays the bending angle of the connecting rod when the second bending arm 5 rotates clockwise and bends the connecting rod in a clockwise direction. The second rotating pointer 9-2 displays the bending angle of the connecting rod when the second bending arm 5 rotates counterclockwise and bends the connecting rod in a counterclockwise direction. This allows the bending angle of the connecting rod to be displayed regardless of whether the rotation is clockwise or counterclockwise. Furthermore, since bending the connecting rod clockwise is more common, the size of the first rotating pointer 9-1 is preferably larger than the size of the second rotating pointer 9-2.

[0061] Because clinical surgery for spinal deformities may require a connecting rod that is bent at a large angle, under the load of a human hand, the gap between the fixed handle 1 and the movable handle 2 gradually decreases in the left-right direction, and the fixed handle 1 and the movable handle 2 move closer to each other in the left-right direction. However, even when the gap between the fixed handle 1 and the movable handle 2 in the left-right direction disappears, the connecting rod may not have been bent to the target angle. Therefore, it is necessary to apply a load to make the fixed handle 1 and the movable handle 2 move away from each other in the left-right direction. At this time, the fixed handle 1 and the movable handle 2 will cross, which makes it inconvenient to apply force.

[0062] In this case, the movable handle 2 is preferably detachably connected to the pivot 3 so that when the connecting rod needs to be bent at a large angle, the movable handle 2 is pre-positioned at a position further away from the fixed handle 1 in the left-right direction, so as to reserve distance when the fixed handle 1 and the movable handle 2 are driven by the hand to approach each other, to prevent the phenomenon of hands crossing during the bending process, and to make the operation more comfortable.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A large angle quantitative bending bender characterized by, include: The handle includes a fixed handle pivotally connected to a pivot and a movable handle fixedly connected to the pivot, the fixed handle and the movable handle being pivotally connected via the pivot and located on opposite sides of the pivot; A pivot is provided on the fixed handle and the movable handle; The bending arm includes a first bending arm that moves synchronously with the fixed handle and a second bending arm that moves synchronously with the movable handle. The second bending arm and the movable handle are located on opposite sides of the pivot, and the first bending arm and the second bending arm are pivotally connected through the pivot.

2. A large angle quantitative bending bender according to claim 1, characterized in that, The free end of the first bending arm is provided with a first retaining seat, and the free end of the second bending arm is provided with a second retaining seat. The first retaining seat holds the first part of the connecting rod, and the second retaining seat holds the second part of the connecting rod.

3. A large angle, precision bending bender as defined in claim 1 wherein, A glass bead is provided on the second bent arm, and a glass bead limiting groove is provided on the pivot. The glass bead and the limiting groove cooperate with each other, and the second bent arm and the pivot are plugged and inserted.

4. A large angle, precision bending bender as defined in claim 1 wherein, A rotating pointer is provided on the second bent arm, and scale lines are provided on the first bent arm.

5. A large angle, precision bending bender as defined in claim 4 wherein, The rotating pointer includes a first rotating pointer and a second rotating pointer. The first rotating pointer points to the scale line to indicate the angle of bending the connecting rod when the second bending arm rotates clockwise and bends the connecting rod in a clockwise direction. The second rotating pointer points to the scale line to indicate the angle of bending the connecting rod when the second bending arm rotates counterclockwise and bends the connecting rod in a counterclockwise direction.

6. A large angle, precision bending bender as defined in claim 1 wherein, The large-angle quantitative bending rod bending machine further includes a shift disc, which is disposed between the fixed handle and the movable handle. The shift disc has a locking position, a left-hand rotation position, and a right-hand rotation position. The shift disc includes: A locking tooth, wherein the locking tooth is disposed on the pivot; A stop block is fixedly connected to the fixed handle by a pin. The stop block includes a first stop block and a second stop block, which are arranged opposite to each other on both sides of the pivot. The slide includes a first slide and a second slide, which are disposed opposite to each other on both sides of the pivot. The upper parts of both the first slide and the second slide are inclined inward. The first stop is pivotally connected to the first slide by a pin, and the second stop is pivotally connected to the second slide by a pin. In the locked position, the first stop and the second stop engage the locking teeth from the left and right sides; in the left-hand rotation position, the first stop engages the left side of the locking teeth, and the second stop separates from the right side of the locking teeth; in the right-hand rotation position, the first stop separates from the left side of the locking teeth, and the second stop engages the right side of the locking teeth.

7. A large angle, precision bending bender as defined in claim 6 wherein, A glass bead is provided on the first bending arm, and a glass bead limiting groove is provided on the shift plate, with the glass bead and the limiting groove cooperating with each other.

8. A large angle, precision bending mandrel according to claim 7, wherein, The glass bead limiting groove includes a first limiting groove, a second limiting groove, and a third limiting groove. When the glass bead engages with the first limiting groove, the shift disc is in a locked position; when the glass bead engages with the second limiting groove, the shift disc is in a left-hand rotation position; and when the glass bead engages with the third limiting groove, the shift disc is in a right-hand rotation position.

9. A large angle, precision bending mandrel according to claim 6 wherein, The first stop and the second stop each include a first part and a second part. A first pin passes through the first part and is disposed in a blind hole on the end face of the first bent arm near the shift disc. A second pin passes through the second part and is disposed in the slide groove.

10. A large angle, precision bending bender as defined in claim 9 wherein, A torsion spring is provided on the first pin shaft of the first and second blocks.

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