A rod bending device and forming method for connecting rods in orthopedic spine surgery

Abstract

The invention discloses a rod bending device and a forming method for connecting rods for orthopedic spinal surgery, the rod bending device comprises a rigid frame supporting plate, a bending assembly, a sliding rod and a sliding part, the sliding rod has a plurality of parallel mounted in the rigid frame supporting plate, a group of sliding parts is passed through each sliding rod, the length of each group of sliding parts is consistent and they are located on the same side to form an array; the bending assembly comprises a top pressure plate and a driving mechanism; when bending the connecting rod, the distribution of the sliding part array is first changed, and the sliding part is moved along the sliding rod, so that a gap is formed between the sliding parts on both sides and the edge of the gap defines the required curvature of the connecting rod; the connecting rod blank is placed in the gap, and the top pressure plate, driven by the driving mechanism, pushes the sliding part to move synchronously to realize the resetting of the sliding parts on both sides, and through the multi-point rod bending principle, the bending curvature is more accurately controlled, and the sliding part is directly pressed and formed at one time, and the operation is simple and convenient; the connecting rod is supported on the rod bending device and clamped by multiple points, so the clamping effect is good and it is not easy to slip or pop out.

Description

Technical Field

[0001] The invention relates to the field of medical equipment, in particular to a rod bender and a bending method for bending a connecting rod in orthopedic spinal surgery. Background Art

[0002] Screw-rod technology (pedicle screw fixation, vertebral screw fixation, etc.) is the most commonly used technology in spinal surgery. After the screw is implanted, a connecting rod with a suitable curvature is placed to restore the physiological curvature of the spine or correct the deformity. Therefore, how to use a rod bender to bend the connecting rod into a suitable curvature is very critical.

[0003] The most common one in the prior art is a three-point rod bender, such as the rod bender disclosed in the utility model patent with patent announcement number CN205913389U, which includes a pair of long arms, a pivot and a bending assembly. On the basis of the three-point rod bending principle, an arc measuring ruler is added. The measuring ruler located at the end of the long arm can display the curvature of the bending rod; for example, the utility model patent with patent announcement number CN212015745U discloses an adjustable rod bender, which includes left and right clamp heads and left and right clamp handles, as well as a sliding plate and an angle measurer. A bending assembly for three-point bending is provided on the sliding plate. Different bending curvatures can be achieved by disassembling the left and right clamp heads, the sliding plate and the bending assembly of the rod bender.

[0004] However, the above-mentioned rod bender has the following disadvantages: (1) poor accuracy. Since the connecting rod has few stress points, the angle after bending can only be determined by the doctor's experience, which has a large error; (2) lack of reproducibility and consistency. During the bending operation, it is impossible to control and measure the current curvature. Even if the physician plans the curvature of the rod based on the imaging data before the operation, the traditional rod bender cannot produce a connecting rod that meets the preoperative plan; (3) lack of continuity and is time-consuming and labor-intensive. Since the opening of the rod bender is small, it is impossible to form a longer connecting rod at one time. When the surgical range is large (more than 2 segments), the rod bender needs to be moved repeatedly, which makes the operation complicated. , wasting time; (4) It is impossible to accurately achieve "S"-shaped bending of the rod. For patients with scoliosis or severe osteoporosis, long-segment surgery usually involves two physiological bends, and the connecting rod needs to be completed in an "S" shape. The current rod bender has a single bending direction. Even with a simulated rod for reference, it is difficult to accurately bend the rod into the required arc. Repeated operations are required, which reduces the rigidity of the connecting rod and increases the risk of postoperative broken nails, broken rods, or loose internal fixation; (5) The holding force is poor and it is easy to slip. The current rod bender is easy to slip or even pop out when bending short rods, which may injure the operating physician or damage the patient's spinal cord or nerves, affecting function.

[0005] Therefore, it is necessary to design a rod bending device that can accurately bend rods, continuously bend rods, save time and effort, is safe, and is formed in one step to overcome the shortcomings of the prior art such as poor accuracy, repeated operations, and easy slipping when bending rods. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a rod bender and a forming method for a connecting rod used in orthopedic spinal surgery.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A rod bender for connecting rods in orthopedic spinal surgery comprises a rigid frame carrier plate, a bending assembly, a sliding rod and a sliding member, wherein the sliding rod has multiple parallel structures arranged in the rigid frame carrier plate to form a fence-like structure, a group of sliding members are passed through each sliding rod, and each group of sliding members has the same length. The sliding members are located on the same side of the rigid frame carrier plate to form an array, and the bending assembly is located on the other side of the rigid frame carrier plate; the bending assembly comprises a top pressure plate arranged perpendicular to the sliding rod and a driving mechanism for driving the top pressure plate to slide toward the sliding member; a gap matching the curvature of the connecting rod is formed by changing the distribution of the sliding member array, and under the push of the top pressure plate, the sliding member arrays on both sides of the gap clamp the connecting rod blank to realize the bending of the connecting rod.

[0009] The sliding member is a spherical ball.

[0010] The sliding member forms inner concave surfaces along two opposite side surfaces on the axis of the penetration hole, and a space for clamping the connecting rod is formed between the inner concave surfaces of the two sliding members.

[0011] The driving mechanism comprises a connecting rod arm and a driving rod, wherein the middle part of the connecting rod arm is hinged to the rigid frame bearing plate, the lower end part is hinged to the end part of the driving rod, and the other end part of the driving rod is hinged to the top pressure plate.

[0012] The connecting rod arm comprises a straight arm portion and a bent arm portion, and a hinge joint hinged to the rigid frame bearing plate is provided at the intersection of the straight arm portion and the bent arm portion, and the end of the bent arm portion is hinged to the end of the driving rod.

[0013] A clearance opening (31) is provided on the side of the rigid frame bearing plate corresponding to the swing position of the connecting rod arm.

[0014] The top pressure plate is penetrated on the sliding rod through a plurality of through holes arranged thereon and slides along the sliding rod.

[0015] The driving rod comprises a screw rod and a screw-on sleeve, and the screw-on sleeve can be rotated relative to the screw rod to adjust the length of the driving rod.

[0016] A method for forming a connecting rod for orthopedic spinal surgery, using the above-mentioned rod bender, changing the distribution of the sliding member array according to actual needs, moving the sliding member along the sliding rod to separate it into left and right sides, forming a gap between the sliding members on both sides and the edge of the gap defining the required curvature of the connecting rod; placing the connecting rod into the gap; driving the top pressure plate through the driving mechanism, under the action of the top pressure plate, pushing one side of the sliding member to reset synchronously, and bending the connecting rod to a preset curvature under the squeezing of the sliding members on both sides.

[0017] The beneficial effects of the present invention are:

[0018] (1) Different from the traditional three-point rod bender, the present invention forms multiple force points on the connecting rod by forming an array of multiple sets of sliding parts, thereby realizing multi-point rod bending, which can more accurately quantify and control the curvature;

[0019] (2) The arc shape of the connecting rod is set by using a plurality of sliding member arrays of a sliding module; the array of sliding members can be adjusted based on experience, or a simulated rod can be pre-installed to obtain an individualized and precise arc, and then the bent simulated rod is pressed into the middle of the sliding member to obtain the required arc shape, forming an arc that is 1:1 with the body; the latter is particularly safe and efficient in spinal orthopedic surgery or patients with severe osteoporosis who require long-segment in situ fixation;

[0020] (3) After the connecting rod is placed, the present invention directly presses and forms it once through the sliding module, which makes the operation simpler and more convenient;

[0021] (4) The connecting rod is supported on the rod bender of the present invention and is clamped at multiple points, so the clamping effect is good and the connecting rod is not easy to slip or pop out. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 yes Figure 1 A top view of

[0025] Figure 3 It is a schematic diagram of the structure of the separate array of sliding modules of the present invention;

[0026] Figure 4 yes Figure 3 A top view of

[0027] Figure 5 It is a schematic diagram of the structure of the present invention when bending a rod;

[0028] Figure 6 yes Figure 5 A top view of

[0029] Figure 7 is a schematic structural diagram of a first embodiment of a sliding member of the present invention;

[0030] Figure 8 is a schematic structural diagram of a second embodiment of a sliding member of the present invention;

[0031] Fig. 9 It is a structural schematic diagram of the press-bending assembly of the present invention;

[0032] Fig.10 , Fig.11 It is a working schematic diagram of the press bending assembly of the present invention. DETAILED DESCRIPTION

[0033] Reference Figure 1 , Figure 2 A rod bender for connecting rods in orthopedic spinal surgery comprises a rigid frame carrier plate 1, a bending assembly 2, a sliding rod 3 and a sliding member 4. The rigid frame carrier plate 1 has a rectangular metal frame. The bending assembly 2 comprises a top pressure plate 5 arranged perpendicular to the sliding rod 3 and a driving mechanism 6 for driving the top pressure plate 5 to slide toward the sliding member 4. The sliding rod 3 is a metal rod with a smooth surface and has a plurality of parallel rods erected in the rigid frame carrier plate 1 to form a fence-like structure. A group of sliding members 4 are passed through each sliding rod 3. The smaller the size of the sliding member 4, the more and denser the sliding rods 3 are arranged, and the higher the accuracy of the rod bending.

[0034] Normally, the sliding members 4 are arranged on the same side of the rigid frame carrier plate 1 to form an array, and the bending assembly 2 is located on the other side of the rigid frame carrier plate 1 .

[0035] like Figures 3 to 6 As shown, when the connecting rod is press-bent and formed by using a rod bender, first, the curvature of the connecting rod is determined according to actual needs, the distribution of the array of sliding members 4 is changed, and the sliding members 4 are moved to separate them into left and right sides, and a gap is formed between the sliding members on the two sides, and the edge of the gap defines the curvature of the connecting rod. At this time, the connecting rod blank is placed in the gap, and the top pressure plate 5 pushes one side of the sliding member 4 to move and reset along the sliding rod 3 under the drive of the driving mechanism 6. At the same time, the sliding members 4 on both sides are combined to clamp and squeeze the connecting rod, and multiple groups of sliding members apply force to achieve multi-point bending of the rod, which can more accurately control the curvature of the bending rod and complete the connection rod with a preset curvature at one time. Furthermore, a simulation rod can be used to press into the sliding member 4, and the array distribution of the sliding member 4 can be adjusted according to the curvature of the simulation rod; the simulation rod is pre-planned and bent after obtaining accurate data based on the individual patient's examination report, imaging data, etc. Therefore, an individualized and more accurate curvature can be obtained by pre-installing the simulation rod, forming a 1:1 curvature with the patient's internal spine. The connecting rod bent by this curvature is particularly safe and efficient in patients undergoing spinal orthopedic surgery or severe osteoporosis who require long-segment in situ fixation.

[0036] As a preferred embodiment of the present invention, the sliding member 4 is a metal sphere with a central circular hole (such as Figure 7 As shown), in another preferred embodiment, the sliding members 4 are provided with arc-shaped grooves 41 (as shown in FIG. Figure 8 As shown in FIG. 1 , a central hole is formed between the arc-shaped grooves on both sides, and the arc-shaped grooves clamp the surface of the connecting rod to achieve better fixation, so that the connecting rod can be bent more stably under force. In addition to the above embodiments, the sliding member 4 also has a variety of variations, such as the opposite surface of the sliding member is designed to be a plane, etc., which will not be described one by one here.

[0037] The driving mechanism 6 can be set to semi-automatic or manual. The semi-automatic type can be driven by power elements such as gas rods or motors, while the preferred embodiment of the present invention adopts a manual driving mechanism, such as Figures 9 to 11 As shown, it includes a connecting rod arm 7 and a driving rod 8. The middle part of the connecting rod arm 7 is hinged to the side of the rigid frame carrier plate 1 to form a lever structure, and the lower end is hinged to the end of the driving rod 8. The other end of the driving rod 8 is hinged to the top pressure plate 5. The connecting rod arm 7 includes a straight arm portion 71 and a bent arm portion 72. The intersection of the straight arm portion 71 and the bent arm portion 72 is provided with an articulated joint hinged to the side of the rigid frame carrier plate 1. The end of the bent arm portion 72 is hinged to the end of the driving rod 8, and the other end of the driving rod 8 is hinged to the top pressure plate 5. The user can grab the straight arm portion 71 to apply force, while the bent arm portion 72 can better bear the force and transfer the force to the driving rod 8. Through the principle of lever, the connecting rod blank can be bent more easily. The side of the rigid frame carrier plate 1 is provided with a clearance hole 11 corresponding to the swing position of the connecting rod arm 7, so that the connecting rod arm 7 can swing more flexibly.

[0038] Preferably, a plurality of avoidance holes 61 are provided on the top pressure plate 5 corresponding to the sliding rod 3. The top pressure plate 5 is mounted on the sliding rod 3 through the avoidance holes 61 and slides along the sliding rod 3, so that the top pressure plate 5 and the sliding member 4 are at the same level, which can better apply force to the sliding member 4.

[0039] Preferably, the driving rod 8 includes a screw rod 81 and a screw-on sleeve 82 . The screw-on sleeve 82 can be rotated relative to the screw rod 81 to adjust the length of the driving rod 8 , thereby adjusting the moving distance of the top pressure plate.

[0040] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, without departing from the principle of the present invention, any technical purpose and technical effect of the present invention achieved by basically the same technical means should fall within the protection scope of the present invention.

Claims

1. A rod bender for connecting rods in orthopedic spine surgery, characterized in that: The invention comprises a rigid frame bearing plate (1), a bending assembly (2), a sliding rod (3) and a sliding member (4); the sliding rod (3) comprises a plurality of sliding rods (3) arranged in parallel in the rigid frame bearing plate (1) to form a fence-like structure; a group of sliding members (4) are passed through each sliding rod (3); the sliding members (4) are arranged on the same side of the rigid frame bearing plate (1) to form an array; the bending assembly (2) is located on the other side of the rigid frame bearing plate (1); the bending assembly (2) comprises a top pressure plate (5) arranged perpendicular to the sliding rod (3) and a driving mechanism (6) for driving the top pressure plate (5) to slide toward the sliding member (4); a gap matching the curvature of a connecting rod is formed by changing the distribution of the sliding member (4) array; under the push of the top pressure plate (5), the sliding member arrays on both sides of the gap clamp the connecting rod blank to achieve the bending of the connecting rod.

2. The rod bender according to claim 1, characterized in that: The sliding member (4) is a spherical ball.

3. The rod bender according to claim 1, characterized in that: The sliding member (4) forms inner concave surfaces (41) on two opposite side surfaces along the axis of the penetration hole, and a space for clamping the connecting rod is formed between the inner concave surfaces (41) of the two sliding members.

4. The rod bender according to claim 1, characterized in that: The driving mechanism (6) comprises a connecting rod arm (7) and a driving rod (8), wherein the middle portion of the connecting rod arm (7) is hinged to the rigid frame supporting plate (1), the lower end portion is hinged to the end portion of the driving rod (8), and the other end portion of the driving rod (8) is hinged to the top pressure plate (5).

5. The rod bender according to claim 4, characterized in that: The connecting rod arm (7) comprises a straight arm portion (71) and a bent arm portion (72); an articulated joint hinged to the rigid frame bearing plate (1) is provided at the intersection of the straight arm portion (71) and the bent arm portion (72); and an end of the bent arm portion (72) is hinged to an end of the driving rod (8).

6. The rod bender according to claim 4 or 5, characterized in that: A clearance opening (11) is provided on the side of the rigid frame bearing plate (1) corresponding to the swing position of the connecting rod arm (7).

7. The rod bender according to claim 1, 2 or 3, characterized in that: The top pressure plate (5) is inserted through a plurality of through holes (51) provided thereon and slides along the sliding rod (3).

8. The rod bender according to claim 4, characterized in that: The driving rod (8) comprises a screw rod (81) and a screw-on sleeve (82); the screw-on sleeve (82) can be rotated relative to the screw rod (81) to adjust the length of the driving rod (8).

9. A method for forming a connecting rod for orthopedic spine surgery, characterized in that: The rod bender as claimed in any one of claims 1 to 8 is adopted, and the distribution of the sliding member array is changed according to actual needs. The sliding member (4) is pushed along the sliding rod (3) to separate into left and right sides, and a gap is formed between the sliding members (4) on both sides, and the edge of the gap defines the required curvature of the connecting rod. At this time, the connecting rod blank is placed in the gap, and the top pressure plate (5) is driven by the driving mechanism (6). Under the action of the top pressure plate (5), the sliding member (4) is pushed to reset, and the connecting rod is bent to a preset curvature under the squeezing of the sliding members (4) on both sides.

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