Bar bending device for spine

Abstract

The utility model discloses a rod bending device for a spine, which belongs to the technical field of medical instruments and comprises a left forceps handle and a right forceps handle hinged to the front portion of the left forceps handle, a driving gear is arranged at the hinged position of the left forceps handle and the right forceps handle, and a driven gear meshed with the driving gear is arranged at the front end of the left forceps handle. A middle bar pressing column is arranged at a rotating shaft of the driven gear, a first side face bar pressing column is arranged at the position, behind the driven gear, of the front portion of the left clamp handle, and a second side face bar pressing column is arranged at the position, away from the first side face bar pressing column, of the driven gear. A transmission device used for pushing the driving gear to rotate so as to drive the driven gear to rotate in a stepping mode, and therefore the middle bar pressing column, the first side face bar pressing column and the second side face bar pressing column can bend the connecting bar gradually is arranged on the right clamp handle, and a locking device used for preventing the driving gear from retreating is arranged on the left clamp handle. Deviation of the bent connecting rod can be avoided, the rod can be bent with one hand, operation is more labor-saving, and operation time can be saved conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a spinal rod bending device. Background Art

[0002] In orthopedic surgery, some fixing elements are often used to fix various parts of the patient's bones at an ideal angle. For example, in spinal surgery, connecting rods bent at a certain angle are required to connect the vertebrae. When formulating the surgical plan, the doctor will determine the bending angle of the connecting rod. Usually, a traditional three-point rod bender is used to bend the connecting rod during the operation. For example, utility model patent CN205913389U discloses a rod bender, CN209004181U discloses a spinal connecting rod bender, and CN215018751U discloses a spinal titanium rod precision pre-bender.

[0003] These rod benders usually require two hands to operate, using the lever formed by the length of the handle to press the connecting rod to bend the connecting rod. Although these rod benders are easy to use and simple to operate, the bent connecting rod is prone to deviation, ultimately resulting in poor surgical results, and the force used to bend the rod is relatively large. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a spinal rod bender which has high bending accuracy and saves labor.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A spinal rod bender comprises a left clamp handle and a right clamp handle hinged to the front of the left clamp handle, a driving gear is provided at the hinge of the left clamp handle and the right clamp handle, and a driven gear meshing with the driving gear is provided at the front end of the left clamp handle;

[0007] The rotating shaft of the driven gear is provided with an intermediate rod pressing column, the front part of the left clamp handle is provided with a first side rod pressing column behind the driven gear, and the driven gear is provided with a second side rod pressing column at a position away from the first side rod pressing column;

[0008] The right clamp handle is provided with a transmission device for pushing the driving gear to rotate to drive the driven gear to rotate step by step so that the middle pressure rod column, the first side pressure rod column and the second side pressure rod column gradually bend the connecting rod, and the left clamp handle is provided with a locking device for preventing the driving gear from retreating.

[0009] Furthermore, a driving ratchet is coaxially fixed on the driving gear, and the transmission device includes an active pawl hinged on the right clamp handle and capable of engaging with the active ratchet to drive the active ratchet to rotate.

[0010] Furthermore, the locking device includes a stopping pawl hinged on the left clamp handle and capable of engaging with the active ratchet to prevent the active ratchet from retreating.

[0011] Furthermore, the right pliers handle is provided with a first torsion spring for pushing the active pawl so that the active pawl remains engaged with the active ratchet wheel;

[0012] And / or, a first cylindrical pin is provided on the right pliers handle behind the active pawl to prevent the active pawl from over-rotating;

[0013] And / or, the left pliers handle is provided with a second torsion spring for pushing the stopping pawl so that the stopping pawl remains engaged with the active ratchet.

[0014] Furthermore, the diameter of the active ratchet is greater than the diameter of the active gear;

[0015] And / or, a plug-in slot is provided at the rotating shaft of the active ratchet, a plug-in portion matching the plug-in slot is provided at the rotating shaft of the active gear, a radially extending protrusion is provided on the plug-in portion, and a groove for accommodating the protrusion is provided on the plug-in slot.

[0016] Furthermore, the driven gear includes a semicircular main body and an extension located on the right side of the main body, the arc edge of the main body is provided with meshing teeth matching with the driving gear, and the extension is provided with the second side rod pressing column.

[0017] Furthermore, a first connecting arm and a second connecting arm extending to the right are respectively provided on both sides of the front of the left pliers handle, a first cylinder is fixed between the right sides of the first connecting arm and the second connecting arm, a gap is provided at the front of the right pliers handle for accommodating the driving gear and the driving ratchet, and the front end of the right pliers handle is hinged on the first cylinder.

[0018] Furthermore, a second cylinder is provided at the front end of the left clamp handle, a sleeve portion for being sleeved on the second cylinder is provided at the rotating shaft of the driven gear, a blocking piece for blocking the sleeve portion is provided at the end of the second cylinder, and the second cylinder and the sleeve portion together form the intermediate pressure rod column.

[0019] Furthermore, a sleeve is provided at the front left side of the first connecting arm, a third cylinder is provided at the left side of the second connecting arm, the third cylinder passes through the front part of the left clamp handle and is inserted into the sleeve, and the third cylinder and the sleeve together form the first side pressure rod column;

[0020] And / or, a connecting hole is provided at the rear left side of the first connecting arm, and a fourth cylinder for installing a stopping pawl is provided at the front of the left clamp handle, and the fourth cylinder passes through the stopping pawl and extends into the connecting hole.

[0021] Further, each cylinder is fixed by argon arc welding;

[0022] And / or, the left clamp handle and the right clamp handle are respectively provided with a first elastic sheet and a second elastic sheet for pushing the left clamp handle and the right clamp handle outward.

[0023] The utility model has the following beneficial effects:

[0024] The spinal rod bender of the utility model achieves the purpose of bending the connecting rod by repeatedly pinching the left and right clamp handles and finally rotating the driven gear through a series of mechanical transmissions (not bending the connecting rod at one time as in the prior art). In the utility model, the bending amount of each time by the step-by-step rotation method is relatively small, and the bending accuracy is high, which can solve the problem that the connecting rod after bending in the prior art is prone to deviation. Moreover, the special rod bender structure design allows the operator to bend the rod with one hand, which is more labor-saving than conventional rod bender and is convenient for saving surgical time. Due to the characteristics of its structural design, this rod bender structure can also bend the rod at a large angle, and can quickly bend a connecting rod with a suitable angle and a gradually changing curve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front structural schematic diagram of the spinal rod bender of the utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the side structure of a spinal rod bender shown;

[0027] Figure 3 for Figure 2 The AA section view of the spinal rod bender shown;

[0028] Figure 4 for Figure 1 A schematic diagram of the matching structure between the middle active ratchet, the active pawl and the stop pawl;

[0029] Figure 5 for Figure 4 A schematic diagram of a local enlarged structure;

[0030] Figure 6 for Figure 1 Schematic diagram of the matching structure of the driving gear and the driven gear;

[0031] Figure 7 for Figure 1 A schematic diagram of the matching structure between the middle active gear and the active ratchet;

[0032] Figure 8 for Figure 6 A partial cross-sectional view of the driven gear shaft;

[0033] Fig. 9 for Figure 1 Schematic diagram of the combined structure of the left clamp handle and the right clamp handle;

[0034] Fig.10 for Figure 1 A schematic diagram of the structure of the middle left clamp handle and the second connecting arm;

[0035] Fig.11 for Figure 1 Schematic diagram of the structure of the middle right clamp handle;

[0036] Fig.12 for Figure 1 A schematic diagram of the structure of the first connecting arm;

[0037] Fig.13 for Figure 1 The diagram shows the spinal rod bender in use. DETAILED DESCRIPTION

[0038] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0040] The utility model provides a spinal rod bending device, such as Figure 1-13 As shown, it comprises a left clamp handle 1 and a right clamp handle 2 hinged to the front of the left clamp handle 1, wherein:

[0041] A driving gear 3 is provided at the hinge of the left clamp handle 1 and the right clamp handle 2, and a driven gear 4 meshing with the driving gear 3 is provided at the front end of the left clamp handle 1;

[0042] An intermediate rod pressing column 41 is provided at the rotating shaft of the driven gear 4, a first side rod pressing column 11 is provided at the front of the left clamp handle 1 behind the driven gear 4, and a second side rod pressing column 42 is provided on the driven gear 4 at a position away from the first side rod pressing column 11;

[0043] The right clamp handle 2 is provided with a transmission device for pushing the driving gear 3 to rotate to drive the driven gear 4 to rotate step by step so that the middle pressure rod column 41, the first side pressure rod column 11 and the second side pressure rod column 42 gradually bend the connecting rod 10, and the left clamp handle 1 is provided with a locking device for preventing the driving gear 3 from retreating.

[0044] When using, refer to Fig.13 First, place the connecting rod 10 between the middle pressure rod column 41, the first side pressure rod column 11 and the second side pressure rod column 42, that is, the middle pressure rod column 41 is located in the middle of the connecting rod 10 to be bent, and the first side pressure rod column 11 and the second side pressure rod column 42 are respectively located on both sides of the connecting rod 10 to be bent, and then pinch the left clamp handle 1 and the right clamp handle 2. At this time, the transmission device on the right clamp handle 2 drives the active gear 3 to rotate to drive the driven gear 4 to rotate step by step, so that the middle pressure rod column 41, the first side pressure rod column 11 and the second side pressure rod column 42 gradually bend the connecting rod 10. After one pinching, the locking device on the left clamp handle 1 prevents the active gear 3 from retreating. Then, the left clamp handle 1 and the right clamp handle 2 are repeatedly pinched in the same way. When the connecting rod 10 is bent to a suitable angle, the connecting rod 10 can be removed.

[0045] In the prior art, the left and right handles of the three-point rod bender are usually hinged at the front, and a middle rod pressing column is provided at the hinge, and a first side rod pressing column and a second side rod pressing column are provided at the front ends of the left and right handles, respectively; the rod bender usually needs to be operated with both hands, and the lever formed by the length of the handle is used to press the connecting rod, and the connecting rod is bent by pinching once. Although such a rod bender is easy to use and simple to operate, the connecting rod after bending is prone to deviation, which ultimately leads to poor surgical results, and the force used to bend the rod is also relatively large.

[0046] The spinal rod bending device of the utility model comprises a left clamp handle and a right clamp handle hinged at the front part of the left clamp handle, a driving gear is provided at the hinge part of the left clamp handle and the right clamp handle, a driven gear meshing with the driving gear is provided at the front end of the left clamp handle, an intermediate rod pressing column is provided at the rotating shaft of the driven gear, a first side rod pressing column is provided at the front part of the left clamp handle behind the driven gear, a second side rod pressing column is provided on the driven gear at a position away from the first side rod pressing column, which is different from the position arrangement of the rod pressing columns in the prior art, and a transmission device for pushing the driving gear to rotate to drive the driven gear to rotate step by step so that the intermediate rod pressing column, the first side rod pressing column and the second side rod pressing column gradually bend the connecting rod, and a locking device for preventing the driving gear from retreating is provided on the left clamp handle. In this way, the utility model repeatedly pinches the left clamp handle and the right clamp handle, and finally makes the driven gear rotate through a series of mechanical transmissions to achieve the purpose of bending the connecting rod (not bending the connecting rod at one time in the prior art). Therefore, in the utility model, the bending amount of each time by the step-by-step rotation method is relatively small, and the bending accuracy of the rod is high, which can solve the problem that the connecting rod is prone to deviation after bending in the prior art. Moreover, the special rod bender structure design allows the operator to bend the rod with one hand, which is more labor-saving than conventional rod bender and is convenient for saving surgical time. Due to the characteristics of its structural design, this rod bender structure can also bend rods at large angles, and can quickly bend a connecting rod with a suitable angle and a gradually changing curve.

[0047] In the present invention, the transmission device and the locking device can adopt various methods that can be easily thought of by those skilled in the art, such as directly pushing the driving gear 3 (for example, providing a power gear that can move along the slide groove, and when pushing, the power gear can mesh with the driving gear 3 to achieve a pushing effect, and when there is no need to push, the power gear moves along the slide groove and automatically disengages from the driving gear 3) or locking (for example, using side extrusion locking or ratchet locking, etc.), however, for the convenience of implementation, it is preferred to push or lock the driving gear 3 indirectly, and the specific structural method can be as follows:

[0048] like Figure 1-6 As shown, a driving ratchet 5 can be coaxially fixed on the driving gear 3, and the transmission device includes an active pawl 6 hinged on the right clamp handle 2 (specifically, it can be located behind the active ratchet 5) and can engage with the active ratchet 5 to drive the active ratchet 5 to rotate. In specific implementation, the active pawl 6 can be fixed on the right clamp handle 2 by a cylindrical pin 63.

[0049] The locking device may include a stop pawl 7 which is hinged on the left clamp handle 1 (specifically, may be below the first side pressure rod column 11) and can engage with the active ratchet 5 to prevent the active ratchet 5 from retreating.

[0050] Furthermore, the right clamp handle 2 may be provided with a first torsion spring 61 for pushing the active pawl 6 so that the active pawl 6 keeps meshing with the active ratchet 5. In specific implementation, the first torsion spring 61 may be fixed to the right clamp handle 2 by a cylindrical pin 62, with one end of the first torsion spring 61 abutting against the active pawl 6 and the other end abutting against the side wall of the corresponding accommodation groove (i.e., the subsequent gap 21) on the right clamp handle 2. Due to the existence of the first torsion spring 61, a certain force is applied to the active pawl 6 so that it contacts the active ratchet 5.

[0051] A first cylindrical pin 64 for preventing the active pawl 6 from over-rotating may be provided on the right pliers handle 2 behind the active pawl 6. The function of the first cylindrical pin 64 is to limit the active pawl 6 from over-rotating, causing its tail to contact the active ratchet 5 and interfere with its rotation.

[0052] The left pliers handle 1 may be provided with a second torsion spring 71 for pushing the stop pawl 7 so that the stop pawl 7 keeps meshing with the active ratchet 5. In specific implementation, the second torsion spring 71 may be fixed to the left pliers handle 1 through a cylinder 72, one end of the second torsion spring 71 abuts against the stop pawl 7, and the other end may abut against the cylinder 73. The second torsion spring 71 may give a certain force to abut against the stop pawl 7.

[0053] At this time, the working principle of the active ratchet 5 is as follows:

[0054] like Figure 4-5 As shown, when the active pawl 6 moves a distance of one tooth counterclockwise (i.e. when the pliers handle is opened), the tooth 65 on the active pawl 6 can slide along the tooth 54 on the active ratchet 5 to the next tooth, and then move a distance of one tooth clockwise (i.e. when the pliers handle is pinched) to drive the active ratchet 5 to rotate clockwise; when the active ratchet 5 rotates clockwise, the tooth 74 on the stopping pawl 7 can slide over one tooth of the active ratchet 5 to the next tooth, and then stop the movement of the active ratchet 5 to prevent it from reversing.

[0055] Since the active pawl 6 is fixed to the right pliers handle 2 by the cylindrical pin 63, as the right pliers handle 2 rotates counterclockwise by a certain angle (i.e. when the pliers handle is opened), the active pawl 6 is driven to rotate counterclockwise, and then rotates clockwise by the same angle (i.e. when the pliers handle is pinched), thereby driving the rotation of the active ratchet 5; the stop pawl 7 is used to prevent the active ratchet 5 from reversing.

[0056] like Figure 7As shown, the diameter of the active ratchet 5 is preferably larger than the diameter of the active gear 3, so that it is more labor-saving during operation. In order to facilitate the coaxial fixing of the active gear 3 and the active ratchet 5, a plug-in groove 51 can be provided at the rotating shaft of the active ratchet 5, and a plug-in portion 31 matching the plug-in groove 51 is provided at the rotating shaft of the active gear 3. The plug-in portion 31 is provided with a radially extending protrusion 32, and the plug-in groove 51 is provided with a groove 52 for accommodating the protrusion 32. In this way, the active gear 3 and the active ratchet 5 cooperate through the protrusion 32 and the groove 52, and their contour design can also play a role in preventing rotation. When in use, the active ratchet 6 drives the active ratchet 5 to rotate, and the active gear 3 can also drive the active gear 3 to rotate, and the active gear 3 causes the driven gear 4 to rotate through gear meshing.

[0057] The driven gear 4 can be of various structural forms, for the convenience of implementation, such as Figure 6 As shown, the driven gear 4 preferably includes a semicircular main body 4a and an extension 4b located on the right side of the main body 4a, the arc edge of the main body 4a is provided with meshing teeth 43 that cooperate with the driving gear 3, and the extension 4b is provided with the second side pressure rod column 42, which has a better use effect.

[0058] To facilitate the hinge connection of the left and right clamp handles, Figure 9-12 As shown, the front sides of the left pliers handle 1 can be respectively provided with a first connecting arm 8 and a second connecting arm 9 extending to the right side, a first cylinder 81 is fixedly provided between the right sides of the first connecting arm 8 and the second connecting arm 9, and the front part of the right pliers handle 2 is provided with a gap 21 for accommodating the driving gear 3 and the driving ratchet 5, and the front end of the right pliers handle 2 is hinged on the first cylinder 81 (that is, the driving gear 3 and the driving ratchet 5 are also hinged on the first cylinder 81).

[0059] To facilitate the installation of the driven gear 4 onto the left clamp handle 1, as shown in FIG. Figure 6 , Figure 8 and Fig.10 As shown, the front end of the left clamp handle 1 may be provided with a second cylinder 12, and the shaft of the driven gear 4 is provided with a sleeve portion 44 for sleeved on the second cylinder 12. The driven gear 4 is connected to the left clamp handle 1 in the form of sleeved on the second cylinder 12. At this time, the second cylinder 12 and the sleeve portion 44 together form an intermediate pressure rod column 41, so that the intermediate pressure rod column 41 has strong rigidity and good bending effect. The end of the second cylinder 12 may be provided with a baffle 13 for blocking the sleeve portion 44. The function of the baffle 13 is to prevent the driven gear 3 from falling out and improve the installation firmness, and to maintain the axial rotation degree of the driven gear 3.

[0060] Continue as Figure 9-12As shown, a sleeve 82 can be provided on the front left side of the first connecting arm 8, and a third cylinder 91 can be provided on the left side of the second connecting arm 9. The third cylinder 91 passes through the front part of the left clamp handle 1 and is inserted into the sleeve 82. The third cylinder 91 and the sleeve 82 together form a first side pressure rod column 11. In this way, the first side pressure rod column 11 has strong rigidity and good bending effect.

[0061] A connecting hole 83 may be provided at the rear left side of the first connecting arm 81, and a fourth cylinder 14 for installing a stop pawl 7 may be provided at the front of the left clamp handle 1. The fourth cylinder 14 passes through the stop pawl 7 and extends into the connecting hole 83, thereby improving the connection firmness between the first connecting arm 8 and the left clamp handle 1.

[0062] During assembly at this time, the driving gear 3 and the driving ratchet 5 can first be aligned with the right clamp handle 2 facing the hole 211 on the front end of the right clamp handle 2, and then pass through the first cylinder 81 and be installed together on the left clamp handle 1; the first connecting arm 8 is connected to the left clamp handle 1 and the right clamp handle 2 by the inner hole of the sleeve 82 facing the third cylinder 91, the connecting hole 84 on the right side of the first connecting arm 8 facing the first cylinder 81, and the connecting hole 83 at the lower left side of the first connecting arm 8 facing the fourth cylinder 14, and then fixedly connected to the left clamp handle 1 and the right clamp handle 2 by argon arc welding to achieve a strong fixation effect.

[0063] A second connecting arm 9 is designed on the left clamp handle 1, which is connected to the right clamp handle 2 through the first cylinder 81. The first connecting arm 8 is connected to the right clamp handle 2 through the first cylinder 81. This double fixation is to maintain the rigidity of the entire system during the bending process to avoid failure forms such as flipping.

[0064] The cylinders 81, 12, 91, 14, 72, 73 in the figure can be fixed by argon arc welding to achieve a strong fixing effect. The left clamp handle 1 and the right clamp handle 2 can be respectively provided with a first spring piece 15 and a second spring piece 25 for opening the left clamp handle 1 and the right clamp handle 2 outward. In specific implementation, the first spring piece 15 can be fixed to the left clamp handle 1 by a screw 151, and the second spring piece 25 can be fixed to the right clamp handle 2 by a screw 251. The purpose of the spring piece is to allow the left and right clamp handles to be freely opened after releasing the hands when the left and right clamp handles are pinched together, which is more convenient and quick.

[0065] The working principle of the spinal rod bender of the utility model can be as follows:

[0066] like Fig.13As shown, the dotted line part is the position of the connecting rod 10. If the initial position of the rod bender is not suitable for placing a straight rod, you only need to press the stop pawl 7 and lift the active pawl 6 by hand, so that the active ratchet 5 can be in a free state, and the position of the driven gear 4 can be adjusted to allow the connecting rod 10 to be placed; then move the left clamp handle 1 and the right clamp handle 2 in relative directions, so that the right clamp handle 2 will move with the active pawl 6, thereby moving the active ratchet 5, which in turn drives the active gear 3 to move. Since the driven gear 4 and the active gear 3 are gear meshing, the driven gear 4 will eventually move. One end of the connecting rod 10 is placed on the contact surface 111 of the first side pressure rod column 11, and the other end is on the contact surface 421 of the second side pressure rod column 42. As the driven gear 4 rotates, the connecting rod 10 will be driven to bend.

[0067] In order to facilitate the calculation of the bending angle, the bending angle of the connecting rod 10 can be inferred from the angle of each meshing circle of the gear, and the bending angle of the connecting rod 10 can be accurately controlled. The transmission design of the gear can amplify the force applied by the user through the clamp handle, thereby achieving a labor-saving effect; since the driven gear 4 is designed to rotate 180 degrees, the connecting rod 10 can be bent to a sufficiently large angle to meet clinical needs.

[0068] In summary, the surgical operation performed by the surgical instrument provided by the utility model has obvious advantages. Due to the advantages of gears and ratchets, it is more labor-saving than conventional rod bender and can bend rods with one hand. It can solve the problem that the connecting rods are prone to deviation after bending in the prior art, and can also bend rods at large angles, and can quickly bend connecting rods with suitable angles and gradually changing curves.

[0069] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A spinal rod bender, characterized in that: It comprises a left pliers handle and a right pliers handle hinged at the front of the left pliers handle, a driving gear is provided at the hinge of the left pliers handle and the right pliers handle, and a driven gear meshing with the driving gear is provided at the front end of the left pliers handle; The rotating shaft of the driven gear is provided with an intermediate rod pressing column, the front part of the left clamp handle is provided with a first side rod pressing column behind the driven gear, and the driven gear is provided with a second side rod pressing column at a position away from the first side rod pressing column; The right clamp handle is provided with a transmission device for pushing the driving gear to rotate to drive the driven gear to rotate step by step so that the middle pressure rod column, the first side pressure rod column and the second side pressure rod column gradually bend the connecting rod, and the left clamp handle is provided with a locking device for preventing the driving gear from retreating.

2. The spinal rod bender according to claim 1, characterized in that: A driving ratchet is coaxially fixed on the driving gear, and the transmission device comprises a driving pawl which is hinged on the right clamp handle and can mesh with the driving ratchet to drive the driving ratchet to rotate.

3. The spinal rod bender according to claim 2, characterized in that: The locking device comprises a stop pawl which is hinged on the left pliers handle and can be engaged with the active ratchet to prevent the active ratchet from retreating.

4. The spinal rod bender according to claim 3, characterized in that: The right pliers handle is provided with a first torsion spring for pushing the active pawl so that the active pawl keeps meshing with the active ratchet wheel; And / or, a first cylindrical pin is provided on the right pliers handle behind the active pawl to prevent the active pawl from over-rotating; And / or, the left pliers handle is provided with a second torsion spring for pushing the stopping pawl so that the stopping pawl remains engaged with the active ratchet.

5. The spinal rod bender according to claim 2, characterized in that: The diameter of the active ratchet is greater than the diameter of the active gear; And / or, a plug-in slot is provided at the rotating shaft of the active ratchet, a plug-in portion matching the plug-in slot is provided at the rotating shaft of the active gear, a radially extending protrusion is provided on the plug-in portion, and a groove for accommodating the protrusion is provided on the plug-in slot.

6. The spinal rod bender according to claim 2, characterized in that: The driven gear comprises a semicircular main body and an extension located on the right side of the main body, the arc edge of the main body is provided with meshing teeth matched with the driving gear, and the extension is provided with the second side bar pressing column.

7. The spinal rod bender according to any one of claims 2 to 6, characterized in that: The front sides of the left pliers handle are respectively provided with a first connecting arm and a second connecting arm extending to the right side, a first cylinder is fixed between the right sides of the first connecting arm and the second connecting arm, the front part of the right pliers handle is provided with a gap for accommodating the driving gear and the driving ratchet, and the front end of the right pliers handle is hinged on the first cylinder.

8. The spinal rod bender according to claim 7, characterized in that: A second cylinder is provided at the front end of the left clamp handle, a sleeve portion for being sleeved on the second cylinder is provided at the rotating shaft of the driven gear, a blocking piece for blocking the sleeve portion is provided at the end of the second cylinder, and the second cylinder and the sleeve portion together form the intermediate pressure rod column.

9. The spinal rod bender according to claim 8, characterized in that: A sleeve is provided at the front left side of the first connecting arm, a third cylinder is provided at the left side of the second connecting arm, the third cylinder passes through the front part of the left clamp handle and is inserted into the sleeve, and the third cylinder and the sleeve together form the first side pressure rod column; And / or, a connecting hole is provided at the rear left side of the first connecting arm, and a fourth cylinder for installing a stopping pawl is provided at the front of the left clamp handle, and the fourth cylinder passes through the stopping pawl and extends into the connecting hole.

10. The spinal rod bender according to claim 9, characterized in that: Each cylinder is fixed by argon arc welding; And / or, the left clamp handle and the right clamp handle are respectively provided with a first elastic sheet and a second elastic sheet for pushing the left clamp handle and the right clamp handle outward.

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