A large-angle quantitative bending bar bender

Abstract

This application belongs to the field of medical devices and discloses a large-angle quantitative bending rod bender, which includes a fixed handle and a movable handle connected to a pivot. The fixed handle and the movable handle are located on both sides of the pivot and are pivotally connected through the pivot; a pivot arranged on the fixed handle and the movable handle; a bending arm, which 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 both sides of the pivot, and the first bending arm and the second bending arm are pivotally connected through the pivot; a shift disk arranged between the fixed handle and the movable handle, which includes teeth arranged on the pivot, a first stop block and a second stop block that are fixedly connected to the fixed handle through a pin shaft and are relatively arranged on both sides of the pivot, a first chute and a second chute that are relatively arranged on both sides of the pivot and are both inclined inward, and the stop blocks are pivotally connected to the chutes through the pin shaft. When the rod bender bends the connecting rod at a large angle, the connecting rod can be bent to an accurate angle.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and more particularly to a large-angle quantitative bending rod bender. Background Art

[0002] Posterior spinal rod-screw internal fixation is the main method for treating spinal orthopedic diseases. To adapt to the physiological curvature of the human spine, the connecting rod needs to be bent and shaped during the operation. Due to individual physiological curvature differences, the angles required for bending the connecting rod vary. At this time, an instrument that can quantitatively control the bending angle and arc is needed to meet the clinical needs of the operation. Especially in spinal deformity correction surgery, the degree of spinal deformity of patients is different, and the connecting rod needs to be bent and shaped at a large angle. At the same time, the quantitative control during the bending process is more stringent. Otherwise, the fatigue life of the connecting rod may decrease due to excessive backfolding during the operation, ultimately leading to clinical accidents. Summary of the Invention

[0003] The present invention is precisely proposed based on the above-mentioned needs of the prior art. The technical problem to be solved by the present invention is to be able to bend the connecting rod to an accurate angle when bending and shaping the connecting rod at a large angle.

[0004] To solve the above problems, the technical solution provided by the present invention includes a large-angle quantitative bending rod bender, which is characterized by comprising: a handle, the handle includes a fixed handle pivotally connected to a pivot shaft, and a movable handle fixedly connected to the pivot shaft. The fixed handle and the movable handle are pivotally connected through the pivot shaft, and the fixed handle and the movable handle are located on both sides of the pivot shaft;

[0005] a pivot shaft provided on the fixed handle and the movable handle; a bending arm, 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 respectively located on both sides of the pivot shaft. The first bending arm and the second bending arm are pivotally connected through the pivot shaft; and a shift disk provided between the fixed handle and the movable handle, the shift disk having a locking gear position, a left rotation gear position, and a right rotation gear position.

[0006] Preferably, a first clamping seat is provided at the free end of the first bending arm, and a second clamping seat is provided at the free end of the second bending arm. The first clamping seat clamps the first part of the connecting rod, and the second clamping seat clamps the second part of the connecting rod.

[0007] Preferably, a glass bead is provided on the first bending arm, and a glass bead limiting groove is provided on the shift disk. The glass bead and the limiting groove cooperate with each other.

[0008] Preferably, the bead limiting groove includes a first limiting groove, a second limiting groove, and a third limiting groove. When the bead cooperates with the first limiting groove, the shift disk is in the locked gear position; when the bead cooperates with the second limiting groove, the shift disk is in the left rotation gear position; when the bead cooperates with the third limiting groove, the shift disk is in the right rotation gear position.

[0009] Preferably, beads are provided on the second bending arm, a bead limiting groove is provided on the pivot shaft, the beads cooperate with the limiting groove, and the second bending arm is detachably installed with the pivot shaft.

[0010] Preferably, a rotary pointer is provided on the second bending arm, and a scale line is provided on the first bending arm.

[0011] Preferably, the rotary pointer includes a first rotary pointer and a second rotary pointer. When the second bending arm rotates clockwise, the first rotary pointer bends the connecting rod in the clockwise direction and points to the scale line to display the angle of bending the connecting rod. When the second bending arm rotates counterclockwise, the second rotary pointer bends the connecting rod in the counterclockwise direction and points to the scale line to display the angle of bending the connecting rod.

[0012] Preferably, the shift disk includes: teeth provided on the pivot shaft, a stop block fixedly connected to the fixed handle by a pin shaft. The stop block includes a first stop block and a second stop block. The first stop block and the second stop block are oppositely arranged on both sides of the pivot shaft. The chute includes a first chute and a second chute. The first chute and the second chute are oppositely arranged on both sides of the pivot shaft. The upper parts of the first chute and the second chute are inclined inward. The first stop block is pivotally connected to the first chute by a pin shaft, and the second stop block is pivotally connected to the second chute by a pin shaft. In the locked gear position, the first stop block and the second stop block hold the teeth from both left and right sides; in the left rotation gear position, the first stop block holds the left side of the teeth, and the second stop block is separated from the right side of the teeth; in the right rotation gear position, the first stop block is separated from the left side of the teeth, and the second stop block holds the right side of the teeth.

[0013] Preferably, the first stop block and the second stop block include a first part and a second part. The first pin shaft passes through the first part and is arranged in the blind hole on the end face of the first bending arm close to the shift disk; the second pin shaft passes through the second part and is arranged in the chute.

[0014] Preferably, a torsion spring is provided on the first pin shaft of the first stop block and the second stop block.

[0015] Compared with the prior art, the bent connecting rod of the present invention can conform to the physiological curvature of the patient's corrected spine as much as possible, thereby ensuring the reasonable cooperation between the correction components, better dispersing the load, reducing stress concentration, improving the stability and safety of supporting the spine, and achieving a better treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the embodiments of the present specification. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is the front view of the large-angle quantitative bending rod bender in the specific embodiment of the present invention;

[0018] Figure 2 is the structural diagram of the first card seat in the specific embodiment of the present invention;

[0019] Figure 3 is the structural diagram of the shift disk in the specific embodiment of the present invention;

[0020] Figure 4 is the structural diagram of the shift disk in the locked gear position in the specific embodiment of the present invention;

[0021] Figure 5 is the structural diagram of the shift disk in the left rotation gear position in the specific embodiment of the present invention;

[0022] Figure 6 is the structural diagram of the shift disk in the right rotation gear position in the specific embodiment of the present invention;

[0023] Figure 7 is the structural diagram of the stopper in the specific embodiment of the present invention;

[0024] Figure 8 is the structural diagram of the glass bead in the first bending arm in the specific embodiment of the present invention;

[0025] Figure 9 is the structural diagram of the rotary pointer in the specific embodiment of the present invention.

[0026] Reference numerals:

[0027] 1. Fixed handle; 2. Movable handle; 3. Pivot; 4. First bent arm; 4-1. First card seat; 4-2. First card slot; 4-3. First fixing member; 4-4. Ball; 5. Second bent arm; 5-1. Second card seat; 5-2. Second card slot; 5-3. Second fixing member; 6. Shift disk; 6-1. Slide groove; 6-2. Ball limiting groove; 6-2-1. First limiting groove; 6-2-2. Second limiting groove; 6-2-3. First limiting groove; 7. Stopper; 7-1. Stopper body; 7-2. First pin shaft; 7-3. Second pin shaft; 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 manner

[0028] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. 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 indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] 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 and have nothing to do with their orientations in space.

[0031] For the convenience of understanding the embodiments of the present invention, the following will further explain with specific embodiments in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the embodiments of the present invention.

[0032] In surgeries for treating spinal orthopedic diseases, such as scoliosis, after the curved spine is usually corrected to the normal alignment position, it is fixed to the spine through the combination of a connecting rod and a screw-rod to maintain the normal shape of the corrected spine. The connecting rod provides necessary support for the spine, which is beneficial for the spine to remain stable after correction, so that the spine will be more stable after correction and the risk of deformation occurring again is reduced.

[0033] However, due to the differences in the physiological curvature of the individual spine, the angles required for bending the connecting rod vary. At this time, it is necessary to bend the connecting rod quantitatively to meet the clinical requirements of the surgery.

[0034] And since excessive folding back of the connecting rod easily leads to a decrease in the fatigue life of the connecting rod, a higher precision is required for the quantitative bending degree during the bending process. The precise bending degree of the connecting rod can ensure that the bent connecting rod fits as closely as possible to the physiological curvature of the patient's corrected spine, thereby ensuring a reasonable cooperation between the correction components, better dispersing the load, reducing stress concentration, and thus improving the stability and safety of supporting the spine and achieving a better treatment effect.

[0035] For this reason, in this case, the present specific embodiment provides a large-angle quantitative bending rod bender. The large-angle quantitative bending rod bender can not only bend and shape the connecting rod at a large angle, but also bend the connecting rod to an accurate angle. The structure of the large-angle quantitative bending rod bender is as Figure 1 shown. The large-angle quantitative bending rod bender includes a handle, a pivot, and a bending arm.

[0036] The structure of the large-angle quantitative bending rod bender is as Figure 1 shown. The handle includes a fixed handle 1 and a movable handle 2. The tops of the fixed handle 1 and the movable handle 2 are pivotally connected by a pivot 3 so that the movable handle 2 can 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 along the front-rear direction. An axial hole is provided at the top of the fixed handle 1, and the pivot 3 is arranged in the axial hole to provide a rotational connection between the fixed handle 1 and the pivot 3. Furthermore, the pivot 3 can also be connected to the axial hole through a bearing to facilitate smoother rotation.

[0037] Grip portions are provided at the lower ends of both the fixed handle 1 and the movable handle 2. The shape of the grip portion is adapted to the human hand. For example, a wider dimension is set at the position corresponding to the middle of the human hand to facilitate a firm grip of the human hand, so that the acting force can be stably transmitted to the arm. The outer shape with a wider dimension in the grip portion can be realized by a rubber sleeve.

[0038] The top end of the fixed handle 1 is fixedly connected to a first bent arm 4. The top end of the movable handle 2 is connected to a second bent arm 5. The second bent arm 5 and the movable handle 2 are respectively located on both sides of the pivot 3. The first bent arm 4 moves synchronously with the fixed handle 1, and the second bent 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 bent arm 4 and the second bent arm 5 to move correspondingly, 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 bent arm 4, and the length of the movable handle 2 is greater than the length of the second bent arm 5. In this way, it is more labor-saving to bend the connecting rod through the first bent arm 4 and the second bent arm 5.

[0039] The first bent arm 4 and the second bent arm 5 have fixed ends and free ends. The fixed ends of the first bent arm 4 and the second bent arm 5 are pivotally connected through the pivot 3 so that the second bent arm 5 can rotate relative to the first bent arm 4 around the pivot 3. Further, the second bent arm 5 can be detachably inserted and installed in the pivot 3 in the front-rear direction, and at the same time, it is matched with the bead limiting groove on the pivot 3 through a bead, so as to detachably fix the second bent arm 5 on the pivot 3 and be able to replace the second bent arms 5 of different specifications. The second bent arms 5 of different specifications have different turning radii, and connecting rods with different bending angle requirements can be conveniently bent.

[0040] A first clamping seat 4-1 is arranged at the free end of the first bent arm 4. The first clamping seat 4-1 can rotate relative to the free end of the first bent arm 4. A second clamping seat 5-1 is arranged at the free end of the second bent arm 5. The second clamping seat 5-1 can rotate relative to the free end of the second bent arm 5. The first clamping seat 4-1 clamps the first part of the connecting rod, and the second clamping seat 5-1 clamps the second part of the connecting rod, thereby clamping the connecting rod on the first bent arm 4 and the second bent arm 5.

[0041] Specifically, taking the first clamping seat 4-1 as an example, as Figure 2As shown, a first card slot 4-2 is provided on the first card holder 4-1. The first card slot 4-2 penetrates through the first card holder 4-1 along 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 through the first card holder 4-1. Among them, the sizes of the two side openings of the first card slot 4-2 are larger than the size of the middle 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 penetrates into the first card slot 4-2 from one side opening, passes through the middle space of the first card slot 4-2, and then exits from the other side opening. During this process, while clamping the first part of the connecting rod at the middle position of the first card slot 4-2, a deformation space is reserved for the bending 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 the bending process, so that the curvature of the connecting rod can conform to the human physiological curvature as much as possible. Further, the size of the forward-facing opening of the first card slot 4-2 is small, while the internal space of the first card slot 4-2 is large, preventing the connecting rod from coming out of the first card slot 4-2 and increasing the safety when bending the connecting rod.

[0042] A second card slot 5-2 is provided on the second card holder 5-1. The structure of the second card slot 5-2 is the same as that of the first card slot 4-2, and will not be elaborated here.

[0043] The first card holder 4-1 is connected to the free end of the first bending arm 4 by cooperating with a first fixing member 4-3. When the cooperation relationship 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 bending arm 4, so that one of the two side openings of the first card slot 4-2 is oppositely arranged to one of the two side openings of the second card slot 5-2. The connecting rod can thus sequentially pass through the first card slot 4-2 and the second card slot 5-2, and then the first card holder 4-1 and the first fixing member 4-3 are fastened. Similarly, the second card holder 5-1 is connected to the free end of the second bending arm 5 by cooperating with a second fixing member 5-3. The shape of the second fixing member 5-3 is the same as the shape of the first fixing member 4-3, and will not be elaborated here.

[0044] Further, taking the first fixing member 4-3 as an example, the first fixing member 4-3 is preferably formed as a bolt, so as to provide a large biting force for fixing the first clamping seat 4-1 at the free end of the first bending arm 4, and prevent the first clamping seat 4-1 from loosening relative to the first bending arm 4 when squeezing the fixed handle 1 and the movable handle 2 to drive the first bending arm 4 and the second bending arm 5 to rotate relative to each other to bend the connecting rod, and maintain the stability of the connection between the first clamping seat 4-1 and the first bending arm 4.

[0045] Furthermore, taking the first clamping seat 4-1 as an example, the first clamping seat 4-1 has a forward protrusion relative to the first bending arm 4, and the first clamping groove 4-2 is arranged on the side of the first clamping seat 4-1 away from the first bending arm 4. On the one hand, the protrusion makes the first clamping groove 4-2 for clamping the connecting rod have a distance from the first bending arm 4 in the front-rear direction, and the second clamping groove 5-1 also has a forward protrusion relative to the first bending arm 4. Furthermore, the connecting rod clamped on the bender has a distance from the first bending arm 4 and the second bending arm 5 in the front-rear direction, so as to prevent the first bending arm 4 and the second bending arm 5 from interfering with the connecting rod during the bending process of the connecting rod, and further affecting the precise bending of the connecting rod. On the other hand, the protrusion makes the first clamping seat 4-1 and the second clamping seat 5-1 have the same position in the front-rear direction, so as to limit the connecting rod in the vertical plane formed by extending in the left-right direction and the up-down direction. When the load applied to the handle is transmitted to the first clamping seat 4-1 and the second clamping seat 5-1, it is convenient to precisely bend the connecting rod into the required angle.

[0046] 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 squeezing the fixed handle 1 and the movable handle 2, 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 stressed and bent accordingly.

[0047] Further, the distance between the movable handle 2 and the second bending arm 5 in the front-rear direction is greater than the distance between the first bending arm 4 and the second bending arm 5, so as to form a space for accommodating the shifting disc 6 for directionally bending the connecting rod in the front-rear direction.

[0048] The shifting disc 6 is used for directionally bending the connecting rod, that is, bending the connecting rod in different directions at different gears. And, if it is necessary to fold back to repair the bending angle of the connecting rod, the bending angle of the connecting rod can be adjusted by switching the gear of the shifting disc, and then the bending angle of the connecting rod can be corrected to the required angle, without first disassembling the connecting rod and then reinstalling it in the reverse direction.

[0049] Specifically, the shift disk 6 is connected to the pivot 3. As Figure 3 shown, by rotating the shift disk 6, the gear is shifted. The gears include a locking gear, a left-handed gear, and a right-handed gear. Further, in order to more clearly indicate to the operator which gear the bender is in, a gear pointer 10 is preferably provided at a position corresponding to the gear on the first bending arm 4. When the gear pointer 10 points to different gears, it indicates that the bender is in the corresponding gear. At this time, the bender can only perform bending work in the corresponding gear.

[0050] When the fixed handle 1 and the movable handle 2 are pinched in different gears, 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, and then the connecting rod is bent in a preset direction, avoiding the shape of the bent connecting rod deviating from the surgical requirements and causing a foldback, and reducing the impact on the quality of the connecting rod due to a bending direction error.

[0051] The shift disk 6 is provided with stoppers 7 and a gear 8. The stoppers 7 are oppositely arranged on both sides of the shift disk 6. The gear 8 is fixedly connected to the pivot 3 relatively, and the gear 8 moves synchronously with the pivot 3. The stoppers 7 are distributed on both sides of the gear 8. By rotating the shift disk 6, the stoppers 7 on both sides are engaged with or separated from the gear 8. When the stoppers 7 on both sides are engaged with the gear 8, the stoppers 7 restrict the rotation of the gear 8, and thus restrict the rotation of the pivot 3. At this time, the bender is in the locked gear and cannot bend the connecting rod, as Figure 5 shown; when the left stopper 7 is engaged with the gear 8 and the right stopper 7 is separated from the gear 8, the stopper 7 restricts the gear 8 from rotating clockwise, and thus restricts the pivot 3 from rotating clockwise. At this time, the bender is in the left-handed gear and can only bend the connecting rod counterclockwise, as Figure 6 shown; when the left stopper 7 is separated from the gear 8 and the right stopper 7 is engaged with the gear 8, the stopper 7 restricts the gear 8 from rotating counterclockwise, and thus restricts the pivot 3 from rotating clockwise. At this time, the bender is in the right-handed gear and can only bend the connecting rod clockwise, as Figure 7 shown.

[0052] A shaft hole is provided in the middle of the shift disk 6, and the pivot 3 is arranged in the shaft hole. An O-ring is preferably arranged between the shaft hole of the shift disk 6 and the pivot 3 to prevent wear.

[0053] The stopper 7 is as Figure 7As shown, the stopper 7 includes a stopper body 7-1, a first pin 7-2, and a second pin 7-3. After the first pin 7-2 is arranged in the through hole of the first part of the stopper body 7-1 in the front-rear direction, it is arranged in the blind hole of the end face of the first bending arm 4 close to the shift disk 6. After the second pin 7-3 is arranged in the through hole of the second part of the stopper body 7-1 in the front-rear direction, it is arranged in the chute 6-1 of the shift disk 6 close to the first bending arm 4. The chute 6-1 is relatively arranged on both sides of the pin 3, and the upper part of the chute 6-1 inclines inward, that is, the distance between the upper position of the chute 6-1 and the gear 8 is less than the distance between the lower position of the chute 6-1 and the gear 8.

[0054] Preferably, a torsion spring 7-4 can be arranged on the first pin 7-2, and an opening for accommodating the torsion spring 7-4 can be arranged on the stopper body 7-1.

[0055] When the shift disk 6 rotates to the locked gear position, the gear position pointer 10 points to the locked gear position, and the shift disk 6 is in the locked state, that is, the bender is in the locked state. At this time, the state of the internal components of the shift disk 6 is as Figure 4 shown. The stopper 7 is located at the first position, that is, both the second pins 7-3 are located at the middle positions of the chutes 6-1. The stopper 7 holds the gear 8 from both the left and right sides, and the stopper 7 restricts the gear 8 from rotating clockwise or counterclockwise from both the left and right sides. Furthermore, the gear 8 cannot rotate, and thus cannot drive the second bending arm 5 to rotate. At this time, the bender is locked and cannot bend the connecting rod.

[0056] When the shift disk 6 is in the locked gear position, rotate the shift disk 6 counterclockwise, and the gear position pointer 10 switches from pointing to the locked gear position to pointing to the left rotation gear position. The shift disk 6 switches to the left rotation gear position. At this time, the state of the internal components of the shift disk 6 is as Figure 5 shown. During this switching process, the chute 6-1 in the shift disk 6 drives the stopper 7 from the first position to the second position through the second pin 7-3. The second position is the upper limit position of the left second pin 7-3 in the left chute 6-1. In the second position, the second part of the left stopper 7 is engaged with the left side of the gear 8, and the second part of the right stopper 7 is separated from the right side of the gear 8. At this time, the distance from the center of gravity of the left stopper 7 to the engaging part of the second part of the left stopper 7 and the gear 8 is greater than the distance from the center of gravity of the stopper 7 to other positions of the second part of the left stopper 7. Therefore, in the second position, the stopper 7 restricts the gear 8 from rotating clockwise, and thus restricts the pivot 3 from rotating clockwise. At this time, when the bender is in the left rotation gear position, it can only bend the connecting rod counterclockwise.

[0057] When the shift disk 6 is in the locked gear position, apply a load and rotate the shift disk 6 clockwise. The gear pointer 10 switches from pointing to the locked gear position to pointing to the right rotation gear position. The shift disk 6 switches to the right rotation gear position. At this time, the state of the internal components of the shift disk 6 is as Figure 6 shown. During this switching process, the chute 6-1 in the shift disk 6 drives the stopper 7 from the first position to the third position through the second pin shaft 7-3. The third position is the upper limit position where the left second pin shaft 7-3 is located in the upper part of the left chute 6-1, and the right second pin shaft 7-3 is located in the lower upper limit position of the right chute 6-1. In the third position, the second part of the left stopper 7 is separated from the gear 8, and when the second part of the right stopper 7 is engaged with the gear 8, at this time, the distance from the center of gravity of the right stopper 7 to the engagement part of the second part of the right stopper 7 and the gear 8 is greater than the distance from the center of gravity of the stopper 7 to other positions of the second part of the right stopper 7. Therefore, in the third position, the stopper 7 restricts the gear 8 from rotating counterclockwise, and further restricts the pivot 3 from rotating counterclockwise. At this time, when the bender is in the right rotation gear position, it can only bend the connecting rod in the clockwise direction.

[0058] Preferably, a bead limiting groove 6-2 is provided on the plane of the shift disk 6 on the side close to the first bending arm 4. The bead limiting groove 6-2 cooperates with the bead 4-4 at the corresponding position on the plane of the first bending arm 4 on the side close to the shift disk 6, as Figure 8 shown. Specifically, when the shift disk 6 is in the locked gear position, the bead 4-4 cooperates with the middle first limiting groove 6-2-1; when the shift disk 6 is in the left rotation gear position, the bead 4-4 cooperates with the left second limiting groove 6-2-2; when the shift disk 6 is in the right rotation gear position, the bead 4-4 cooperates with the right third limiting groove 6-2-3 to prevent incomplete gear shifting of the shift disk 6 from affecting the engagement effect between the stopper 7 and the gear 8.

[0059] Further, a rotary 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 rotary 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 may also be provided on the second bending arm 5 and the rotary pointer 9 on the first bending arm 4. The scale indicated by the rotary pointer 9 on the scale line 11 represents the angle by which the second bending arm 5 rotates relative to the first bending arm, that is, the angle by which the connecting rod is bent. Further, at the position where the second bending arm 5 rotates relative to the first bending arm 4, the rotary pointer 9 is preferably provided with a first rotary pointer 9-1 and a second rotary pointer 9-2, as Figure 9 shown. The first rotary pointer 9-1 can display the angle of the bent connecting rod when the second bending arm 5 rotates clockwise and bends the connecting rod in the clockwise direction. The second rotary pointer 9-2 can display the angle of the bent connecting rod when the second bending arm 5 rotates counterclockwise and bends the connecting rod in the counterclockwise direction, so that the angle of the bent connecting rod can be displayed in both clockwise and counterclockwise rotations. Further, since bending the connecting rod in the clockwise direction is more commonly used, the size of the first rotary pointer 9-1 is preferably larger than the size of the second rotary pointer 9-2.

[0060] Since clinical spinal deformity surgeries may require connecting rods to be bent at large angles, at this time, under the action of the human hand load, the distance 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 approach each other in the left-right direction. However, until the distance between the fixed handle 1 and the movable handle 2 in the left-right direction disappears, the connecting rod may still not be bent to the target angle. Therefore, additional load needs to be applied 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 phenomenon of the fixed handle 1 and the movable handle 2 crossing will occur, and it is not convenient to apply force at this time.

[0061] In this case, the movable handle 2 is preferably detachably connected to the pivot 3 so that when a large-angle bent connecting rod is required, the movable handle 2 is pre-set at a position farther from the fixed handle 1 in the left-right direction, leaving a distance during the process of the human hand driving the fixed handle 1 and the movable handle 2 to approach each other, preventing the phenomenon of the two hands crossing during the bending process and making the operation more comfortable.

[0062] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only for the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A large-angle quantitative bending rod bender, characterized in that, Comprising: A handle, 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 are pivotally connected through the pivot, and the fixed handle and the movable handle are located on both sides of the pivot; A pivot, arranged on the fixed handle and the movable handle; A bending arm, 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 respectively located on both sides of the pivot, and the first bending arm and the second bending arm are pivotally connected through the pivot; And a shift disk, arranged between the fixed handle and the movable handle, the shift disk has a locking gear position, a left rotation gear position and a right rotation gear position; The shift disk includes: Teeth, the teeth are arranged on the pivot; Blocks, the blocks are fixedly connected to the fixed handle through pins. The blocks include a first block and a second block, and the first block and the second block are relatively arranged on both sides of the pivot; Chute, the chute includes a first chute and a second chute, the first chute and the second chute are relatively arranged on both sides of the pivot, and the upper parts of the first chute and the second chute are both inclined inward. The first block is pivotally connected to the first chute through a pin, and the second block is pivotally connected to the second chute through a pin; In the locking gear position, the first block and the second block clamp the teeth from the left and right sides; in the left rotation gear position, the first block clamps the left side of the teeth, and the second block is separated from the right side of the teeth; in the right rotation gear position, the first block is separated from the left side of the teeth, and the second block clamps the right side of the teeth.

2. The large-angle quantitative bending bar bender according to claim 1, characterized in that A first clamping seat is arranged at the free end of the first bending arm, and a second clamping seat is arranged at the free end of the second bending arm. The first clamping seat clamps the first part of the connecting rod, and the second clamping seat clamps the second part of the connecting rod.

3. The large-angle quantitative bending rod bender according to claim 1, characterized in that, A ball is arranged on the first bending arm, and a ball limiting groove is arranged on the shift disk, and the ball cooperates with the limiting groove.

4. A large-angle quantitative bending bar bender according to claim 3, characterized in that The ball limiting groove includes a first limiting groove, a second limiting groove and a third limiting groove. When the ball cooperates with the first limiting groove, the shift disk is in the locking gear position; when the ball cooperates with the second limiting groove, the shift disk is in the left rotation gear position; when the ball cooperates with the third limiting groove, the shift disk is in the right rotation gear position.

5. A large-angle quantitative bending bar bender according to claim 1, characterized in that, A ball is arranged on the second bending arm, and a ball limiting groove is arranged on the pivot. The ball cooperates with the limiting groove, and the second bending arm is detachably installed on the pivot.

6. The large-angle quantitative bending bar bender according to claim 1, characterized in that, A rotary pointer is arranged on the second bending arm, and a scale line is arranged on the first bending arm.

7. The large-angle quantitative bending bar bender according to claim 6, characterized in that, The rotating pointer includes a first rotating pointer and a second rotating pointer. When the second bending arm rotates clockwise, the first rotating pointer bends the connecting rod in the clockwise direction and points to the scale line to display the angle of the bent connecting rod. When the second bending arm rotates counterclockwise, the second rotating pointer bends the connecting rod in the counterclockwise direction and points to the scale line to display the angle of the bent connecting rod.

8. A large-angle quantitative bending bar bender according to claim 1, characterized in that The first stopper and the second stopper include a first part and a second part. The first pin shaft passes through the first part and is disposed in a blind hole on the end face of the first bending arm close to the shift disk. The second pin shaft passes through the second part and is disposed in the sliding groove.

9. The large-angle quantitative bending bar bender according to claim 1, characterized in that, A torsion spring is disposed on the first pin shaft of the first stopper and the second stopper.

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