Connecting rod assembly for spinal correction

Abstract

The present invention provides a connecting rod assembly for spinal correction, comprising a first connecting rod, a second connecting rod and a positioning component; the first connecting rod is provided with a rotating shaft; the second connecting rod is provided with a receiving hole for inserting the rotating shaft, and the rotating shaft can rotate in the receiving hole; the second connecting rod is also provided with a receiving component; when the receiving component is connected to the positioning component, the positioning component can press the rotating shaft so that the position of the rotating shaft in the receiving hole is fixed. In the connecting rod assembly of the present invention, the bending angle between the first connecting rod and the second connecting rod can be adjusted, which reduces the reduction of fatigue life caused by damage to the first connecting rod and the second connecting rod, effectively prevents the risk of fracture of the first connecting rod and the second connecting rod, reduces the operation time, and reduces the amount of intraoperative bleeding of the patient.

Description

[0001] This application is a divisional application of the following patent applications:

[0002] Application number: 202110901526.7;

[0003] Application date: August 6, 2021;

[0004] Invention title: Connecting rod assembly for spinal correction Technical Field

[0005] The invention relates to the technical field of medical instruments, and in particular to a connecting rod assembly for spinal correction. Background Art

[0006] At present, the commonly used implants for posterior internal fixation procedures for spinal diseases include pedicle screws, connecting rods and locking screws. The connecting rods are mostly single-rod straight or arc-shaped. During deformity correction surgery, the connecting rods usually need to be bent multiple times and at multiple points, which can easily damage the connecting rods and affect their fatigue life, causing premature failure of the internal fixation system. Summary of the invention

[0007] In view of the above-mentioned shortcomings of the prior art, the technical problem solved by the present invention is to provide a connecting rod assembly for spinal correction with an adjustable bending angle.

[0008] To achieve the above-mentioned and other related purposes, the present invention provides a connecting rod assembly for spinal correction, comprising: a first connecting rod, a second connecting rod and a positioning component;

[0009] The first connecting rod is provided with a rotating shaft;

[0010] The second connecting rod is provided with a receiving hole for inserting the rotating shaft, and the rotating shaft can rotate in the receiving hole; the second connecting rod is also provided with a receiving component; when the receiving component is connected to the positioning component, the positioning component can press the rotating shaft so that the position of the rotating shaft in the receiving hole is fixed.

[0011] Preferably, when the receiving component is connected to the positioning component, the central axis of the positioning component is perpendicular to the central axis of the rotating shaft.

[0012] Preferably, the receiving hole is provided with an inner-hole serration portion; the outer side surface of the rotating shaft is provided with an outer-tooth portion, and the outer-tooth portion is meshed with the inner-hole serration portion.

[0013] Preferably, the receiving hole is a regular polygonal hole, and the rotating shaft is a regular prism structure; the structure of the receiving hole is the same as that of the rotating shaft.

[0014] Preferably, the positioning component includes a connected threaded rod and a screw head, the receiving component is a threaded hole, and the threaded rod is threadedly connected to the screw head; a support member is provided on the second connecting rod, the receiving hole and the receiving component are both arranged on the support member, and the end of the receiving component for inserting the threaded rod is arranged on the supporting surface of the support member.

[0015] Furthermore, the receiving hole is provided with an opening, the opening penetrates to the supporting surface of the supporting member, and the opening is communicated with the receiving member.

[0016] Furthermore, the receiving hole is provided with a through opening for the first connecting rod to pass through, and the central axis of the first connecting rod and the central axis of the second connecting rod are in the same plane.

[0017] Furthermore, a through groove is provided on the outer surface of the receiving component, and the through groove divides the receiving component into a first hole portion and a second hole portion, and the supporting surface is located on the first hole portion; a notch is provided on the receiving hole, and the notch is connected to the through groove; a receiving groove is provided on the supporting surface, and the receiving groove is connected to the through groove.

[0018] Furthermore, the central axis of the first connecting rod is parallel to the central axis of the second connecting rod, one end of the rotating shaft is connected to the first connecting rod, and a stopper is provided on the other end of the rotating shaft, and the size of the stopper is smaller than the size of the notch.

[0019] Furthermore, a flange extending outward is provided on one end of the threaded rod away from the screw head, and the size of the outer side surface of the flange is larger than the size of the receiving component.

[0020] As described above, the connecting rod assembly for spinal correction of the present invention has the following beneficial effects:

[0021] The connecting rod assembly for spinal correction of the present invention has a rotating shaft that can rotate in the receiving hole, so that the bending angle between the first connecting rod and the second connecting rod can be adjusted, which makes the connecting rod assembly for spinal correction able to adapt to the physiological curvature of the spine and adjust the angle; when the spinal correction is completed, the receiving component is tightly connected to the positioning component, and the positioning component presses the rotating shaft so that the position of the rotating shaft in the receiving hole is fixed, and the first connecting rod and the second connecting rod are locked; the connecting rod assembly for spinal correction of the present invention can be used as an orthopedic connecting rod, and the first connecting rod and the second connecting rod of the connecting rod assembly can adapt to the physiological curvature of the spine and adjust the angle before being locked, so there is no need to bend the first connecting rod and the second connecting rod during surgery, which reduces the fatigue life reduction caused by damage to the first connecting rod and the second connecting rod, and effectively prevents the risk of breakage of the first connecting rod and the second connecting rod; reduces the operation time and reduces the patient's intraoperative bleeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The diagram shows a three-dimensional structure of a connecting rod assembly for spinal correction according to Example 1.

[0023] Figure 2 Display as Figure 1 Schematic diagram of the enlarged structure at A.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the connecting rod assembly for spinal correction in Example 1 when it is exploded.

[0025] Figure 4 The diagram shows a three-dimensional structure of a connecting rod assembly for spinal correction according to Embodiment 1 when the first connecting rod rotates relative to the second connecting rod.

[0026] Figure 5 Display as Figure 4 Schematic diagram of the enlarged structure at B.

[0027] Figure 6 The enlarged structural schematic diagram shows a flange disposed on the threaded rod of the connecting rod assembly for spinal correction according to Embodiment 1.

[0028] Figure 7 The diagram shows a three-dimensional structure of a connecting rod assembly for spinal correction according to Embodiment 2.

[0029] Figure 8 Display as Figure 7 Schematic diagram of the enlarged structure at C.

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the connecting rod assembly for spinal correction in Example 2 when it is exploded.

[0031] Fig.10 Display as Fig. 9 Schematic diagram of the enlarged structure at D.

[0032] Fig.11 The figure shows a cross-sectional structural schematic diagram of a second connecting rod of a connecting rod assembly for spinal correction according to Embodiment 2.

[0033] Fig.12 It shows a schematic diagram of the side structure of a vertebral body in which a pedicle screw is implanted in Example 1.

[0034] Fig.13 The diagram shows a top view of the structure of a vertebral body in which a pedicle screw is implanted in Example 1.

[0035] Fig.14 The diagram shows the side structure of the connecting rod assembly for spinal correction according to Example 1 implanted on the correction side of the spine according to Example 1.

[0036] Fig.15 The diagram shows a top view of the structure of the connecting rod assembly for spinal correction according to Example 1 implanted on the correction side of the spine according to Example 1.

[0037] Fig.16 The diagram shows a side structural view of the connecting rod assembly for spinal correction according to Example 1, which can adjust the angle according to the correction of spinal curvature.

[0038] Fig.17 The diagram shows a top view of the structure of the connecting rod assembly for spinal correction according to Example 1, which can adjust the angle according to the correction of spinal curvature.

[0039] Fig.18 It is a schematic diagram of the top view of the structure of the pedicle screw on the vertebral body of Example 1 in which a connecting rod is implanted.

[0040] Fig.19 It is a schematic side view of the structure of installing a locking screw plug in the pedicle screw on the vertebral body of Example 1.

[0041] Fig. 20 The schematic diagram shows a top view of the structure of a locking screw plug installed in a pedicle screw on a vertebral body in Example 1.

[0042] Description of Figure Numbers

[0043] 100 First connecting rod

[0044] 110 Rotation axis

[0045] 111 External teeth

[0046] 112 Stopper

[0047] 200 Second connecting rod

[0048] 210 Storage hole

[0049] 211 Serrations in the hole

[0050] 212 Opening

[0051] 213 Through hole

[0052] 214 Gap

[0053] 220 Attachment parts

[0054] 222 Through slot

[0055] 223 First hole

[0056] 224 Second hole

[0057] 225 receiving slot

[0058] 226 Bell mouth

[0059] 230 Support

[0060] 231 Support surface

[0061] 300 Positioning components

[0062] 310 Threaded Rod

[0063] 311 Flange

[0064] 320 Screw head

[0065] 10 vertebrae

[0066] 20 Pedicle Screws

[0067] 30 Locking screw plug

[0068] 40 Connecting rods DETAILED DESCRIPTION

[0069] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0070] Please refer to the attached drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the attached drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0071] Example 1

[0072] like Figures 1 to 6 , Figures 12 to 20 As shown, the connecting rod assembly for spinal correction of this embodiment includes: a first connecting rod 100, a second connecting rod 200 and a positioning component 300;

[0073] The first connecting rod 100 is provided with a rotating shaft 110;

[0074] The second connecting rod 200 is provided with a receiving hole 210 for inserting the rotating shaft 110, and the rotating shaft 110 can rotate in the receiving hole 210; the second connecting rod 200 is also provided with a receiving component 220; when the receiving component 220 is connected to the positioning component 300, the positioning component 300 can press the rotating shaft 110 so that the position of the rotating shaft 110 in the receiving hole 210 is fixed.

[0075] The connecting rod assembly for spinal correction of the present invention can adjust the bending angle between the first connecting rod 100 and the second connecting rod 200 in the sagittal plane because the rotating shaft 110 can rotate in the receiving hole 210. The first connecting rod 100 and the second connecting rod 200 are connected in a hinged manner, which enables the connecting rod assembly for spinal correction to adjust the angle of the spinal physiological curvature adaptively. When the spinal correction is completed, the receiving component 220 is tightly connected to the positioning component 300, and the positioning component 300 presses the rotating shaft 110 so that the position of the rotating shaft 110 in the receiving hole 210 is fixed. , then the first connecting rod 100 and the second connecting rod 200 are locked firmly; the connecting rod assembly for spinal correction of the present invention can be used as an orthopedic connecting rod member 40, and the first connecting rod 100 and the second connecting rod 200 of the connecting rod assembly can adaptively adjust the angle according to the physiological curvature of the spine before being locked. Therefore, there is no need to bend the first connecting rod 100 and the second connecting rod 200 during surgery, which reduces the fatigue life reduction caused by damage to the first connecting rod 100 and the second connecting rod 200, and effectively prevents the risk of breakage of the first connecting rod 100 and the second connecting rod 200; reduces the operation time and reduces the amount of intraoperative bleeding of patients. Figure 4 The first connecting rod 100 indicated by the dotted line is a state in which the first connecting rod 100 rotates relative to the second connecting rod 200 .

[0076] When the receiving member 220 is connected to the positioning member 300, the central axis of the positioning member 300 is perpendicular to the central axis of the rotating shaft 110. This structure facilitates the positioning member 300 to press the rotating shaft 110.

[0077] The receiving hole 210 is provided with an inner hole serration 211; the outer surface of the rotating shaft 110 is provided with an outer tooth portion 111, and the outer tooth portion 111 meshes with the inner hole serration 211. This structure makes the rotating shaft 110 feel damped when rotating in the receiving hole 210, which is convenient for adjusting the angle between the first connecting rod 100 and the second connecting rod 200 and convenient for operation.

[0078] The positioning component 300 includes a threaded rod 310 and a screw head 320 connected to each other, the receiving component 220 is a threaded hole, and the threaded rod 310 is threadedly connected to the screw head 320; the second connecting rod 200 is provided with a support member 230, the receiving hole 210 and the receiving component 220 are both provided on the support member 230, and one end of the receiving component 220 for inserting the threaded rod 310 is provided on the support surface 231 of the support member 230. The threaded rod 310 and the screw head 320 are connected by threads, which is easy to process and can be firmly connected.

[0079] The receiving hole 210 is provided with an opening 212, which penetrates to the supporting surface 231 of the supporting member 230, and is communicated with the receiving component 220. After the spinal correction is completed, the threaded rod 310 is further screwed into the receiving component 220, and the screw head 320 moves toward the rotating shaft 110 until the screw head 320 presses the rotating shaft 110.

[0080] The cross-sectional dimensions of the screw head 320 increase in a direction away from the threaded rod 310. This structure increases the contact area between the outer side of the screw head 320 and the outer side of the rotating shaft 110 when the screw head 320 presses the rotating shaft 110, so that the screw head 320 can stably press the rotating shaft 110. One end of the threaded hole close to the supporting surface 231 is a bell mouth 226 for inserting the screw head 320, so that the screw head 320 can extend into the threaded hole.

[0081] In order to make the structure more compact, the receiving hole 210 is provided with a through hole 213 for the first connecting rod 100 to pass through, and the central axis of the first connecting rod 100 is in the same plane as the central axis of the second connecting rod 200. The connecting rod assembly of this embodiment can be used in the correction of cervical vertebrae, thoracic vertebrae and lumbar vertebrae.

[0082] The end of the threaded rod 310 away from the screw head 320 is provided with a flange 311 extending outward, and the size of the outer side of the flange 311 is larger than the size of the receiving part 220. This structure can prevent the threaded rod 310 from being separated from the receiving part 220. After the threaded rod 310 is connected to the receiving part 220 and the end of the threaded rod 310 away from the screw head 320 passes through the receiving part 220, the end of the threaded rod 310 away from the screw head 320 is stamped to form the flange 311.

[0083] The method for using the connecting rod assembly for spinal correction of this embodiment includes the following steps:

[0084] 1) implanting a pedicle screw 20 into a vertebral body 10 of a patient's spine;

[0085] 2) implanting the connecting rod assembly for spinal correction of the present embodiment on the correction side of the spine according to the treatment plan, screwing the pedicle screw 20 into the locking screw plug 30, and pre-locking the first connecting rod 100 and the second connecting rod 200 by the locking screw plug 30;

[0086] 3) Correct the spine to a normal physiological curvature or close to a normal physiological curvature. The connecting rod assembly for spinal correction in this embodiment can adjust the angle according to the correction of the spinal curvature. The positioning component 300 is locked. The positioning component 300 can press the rotating shaft 110 so that the position of the rotating shaft 110 in the receiving hole 210 is fixed. The positioning component 300 locks the relative position of the first connecting rod 100 and the second connecting rod 200, and then the locking screw plug 30 in the pedicle screw 20 is locked. At this time, the correction is completed;

[0087] 4) A connecting rod 40 for stabilizing the position is implanted on the opposite side, and a locking screw 30 is screwed into the pedicle screw 20 to lock the connecting rod 40;

[0088] 5) The nail arms of the pedicle screw 20 and the locking screw plug 30 are broken off, and then the skin is sutured, and the operation is completed.

[0089] Example 2

[0090] like Figures 7 to 11 As shown, the difference between this embodiment and embodiment 1 is that the receiving hole 210 is a regular polygonal hole, and the rotating shaft 110 is a regular prism structure; the structure of the receiving hole 210 is the same as that of the rotating shaft 110. This structure makes the rotating shaft 110 feel damped when rotating in the receiving hole 210. In order to facilitate the stable rotation of the rotating shaft 110 in the receiving hole 210, the number of edges of the rotating shaft 110 is at least 12. In this embodiment, the number of edges of the rotating shaft 110 is 12. The connecting rod assembly of this embodiment can be applied to the transition section between the cervical vertebrae and the thoracic vertebrae.

[0091] A through groove 222 is provided on the outer surface of the receiving component 220, and the through groove 222 divides the receiving component 220 into a first hole portion 223 and a second hole portion 224, and the support surface 231 is located on the first hole portion 223; a notch 214 is provided on the receiving hole 210, and the notch 214 is connected to the through groove 222; a receiving groove 225 is provided on the support surface 231, and the receiving groove 225 is connected to the through groove 222. After the spinal correction is completed, the threaded rod 310 is further screwed into the receiving component 220, and the screw head 320 presses the first hole portion 223, so that the size of the through groove 222 between the first hole portion 223 and the second hole portion 224 is reduced, so that the size of the receiving hole 210 is reduced, and the receiving hole 210 can press the rotating shaft 110; therefore, in this embodiment, the positioning component 300 drives the size of the receiving hole 210 to reduce by pressing the first hole portion 223, so as to achieve the pressing of the rotating shaft 110.

[0092] The cross-sectional dimensions of the screw head 320 gradually decrease along the direction away from the threaded rod 310. This structure makes the contact surface between the screw head 320 and the support surface 231 larger, making it easier for the screw head 320 to press the first hole portion 223.

[0093] The central axis of the first connecting rod 100 is parallel to the central axis of the second connecting rod 200. One end of the rotating shaft 110 is connected to the first connecting rod 100. A stopper 112 is provided on the other end of the rotating shaft 110. The size of the stopper 112 is smaller than the size of the notch 214. The notch 214 is for the stopper 112 to be inserted. After the stopper 112 passes through the receiving hole 210, the stopper 112 abuts against the support member 230, thereby preventing the rotating shaft 110 from being separated from the receiving hole 210.

[0094] The difference between the method of using the connecting rod assembly for spinal correction in this embodiment and the method of using the connecting rod assembly for spinal correction in Example 1 is that the locking positioning component 300 drives the storage hole 210 to reduce in size by pressing the first hole portion 223, so that the inner wall of the storage hole 210 presses the rotating shaft 110 to achieve the fixed position of the rotating shaft 110 in the storage hole 210, that is, the positioning component 300 locks the relative position of the first connecting rod 100 and the second connecting rod 200.

[0095] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A connecting rod assembly for spinal correction, It is characterized in that include: A first connecting rod (100), a second connecting rod (200) and a positioning component (300); The first connecting rod (100) is provided with a rotating shaft (110); The second connecting rod (200) is provided with a receiving hole (210) for the rotating shaft (110) to be inserted, and the rotating shaft (110) can rotate in the receiving hole (210); the second connecting rod (200) is also provided with a receiving component (220); when the receiving component (220) is connected to the positioning component (300), the positioning component (300) can press the rotating shaft (110) so that the position of the rotating shaft (110) in the receiving hole (210) is fixed; the positioning component (300) The connecting member (220) comprises a threaded rod (310) and a screw head (320) connected to each other, the receiving member (220) being a threaded hole, the threaded rod (310) being threadedly connected to the screw head (320); a supporting member (230) is provided on the second connecting rod (200), the receiving hole (210) and the receiving member (220) are both arranged on the supporting member (230), and one end of the receiving member (220) for inserting the threaded rod (310) is arranged on a supporting surface (231) of the supporting member (230); When the receiving hole (210) is provided with an opening (212), the opening (212) penetrates to the supporting surface (231) of the supporting member (230), and when the opening (212) is connected to the receiving member (220), the size of the cross section of the screw head (320) increases gradually in a direction away from the threaded rod (310); When a through groove (222) is provided on the outer surface of the receiving component (220), the through groove (222) divides the receiving component (220) into a first hole portion (223) and a second hole portion (224), and the supporting surface (231) is located on the first hole portion (223); a notch (214) is provided on the receiving hole (210), and the notch (214) is connected to the through groove (222); a receiving groove (225) is provided on the supporting surface (231), and when the receiving groove (225) is connected to the through groove (222), the size of the cross section of the screw head (320) decreases successively along the direction away from the threaded rod (310).

2. The connecting rod assembly for spinal correction according to claim 1, Features: When the receiving component (220) is connected to the positioning component (300), the central axis of the positioning component (300) is perpendicular to the central axis of the rotating shaft (110).

3. The connecting rod assembly for spinal correction according to claim 1 or 2, Features: An inner hole sawtooth portion (211) is provided in the receiving hole (210); an outer side surface of the rotating shaft (110) is provided with an outer tooth portion (111), and the outer tooth portion (111) meshes with the inner hole sawtooth portion (211).

4. The connecting rod assembly for spinal correction according to claim 1 or 2, Features: The storage hole (210) is a regular polygonal hole, and the rotating shaft (110) is a regular prism structure; the structure of the storage hole (210) is the same as that of the rotating shaft (110).

5. The connecting rod assembly for spinal correction according to claim 1, Features: When the receiving hole (210) is provided with an opening (212), the opening (212) passes through the supporting surface (231) of the supporting member (230), and the opening (212) is connected to the receiving member (220), the receiving hole (210) is provided with a through hole (213) for the first connecting rod (100) to pass through, and the central axis of the first connecting rod (100) and the central axis of the second connecting rod (200) are in the same plane.

6. The connecting rod assembly for spinal correction according to claim 1, Features: When a through groove (222) is provided on the outer surface of the receiving component (220), the through groove (222) divides the receiving component (220) into a first hole portion (223) and a second hole portion (224), and the supporting surface (231) is located on the first hole portion (223); a notch (214) is provided on the receiving hole (210), and the notch (214) is connected to the through groove (222); a receiving groove (225) is provided on the supporting surface (231), and when the receiving groove (225) is connected to the through groove (222), the central axis of the first connecting rod (100) is parallel to the central axis of the second connecting rod (200), one end of the rotating shaft (110) is connected to the first connecting rod (100), and a stopper (112) is provided on the other end of the rotating shaft (110), and the size of the stopper (112) is smaller than the size of the notch (214).

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