CN117770931A - Split type spine pedicle screw opening device and application method thereof - Google Patents

Abstract

The application provides a split type spine pedicle screw strutting arrangement and a using method thereof, which belong to the technical field of spine correction device devices and comprise a first handle and a second handle, wherein the head ends of the first handle and the second handle are respectively provided with a first connecting piece and a second connecting piece. The first handle is provided with the pivot, and the head end of second handle is provided with the trip, and the trip encloses into the arc wall that has the opening to deviate from second handle tail end direction. When the novel pedicle screw is used, the first handle and the second handle are in a separation state before being connected with the pedicle screw, and the first handle and the second handle are quite free to be connected with the pedicle screws at different positions and are not affected by space positions. After two handles are connected with pedicle screws, the first handle and the second handle are connected in a manual mode, specifically, the rotating shaft is arranged in the arc-shaped groove, preliminary correction of the position of the spine is achieved, and then the first handle and the second handle are kneaded to complete the opening operation. The device has simpler structure and operation mode.

Description

A split spinal pedicle screw distraction device and its use method

Technical field

The present application belongs to the technical field of spinal correction devices, and more specifically, relates to a split spinal pedicle screw expansion device and its use method.

Background technique

In minimally invasive spinal surgery, it is sometimes necessary to correct the position of the pedicles between the vertebrae to the same plane and expand and reposition them. Since the initial positions of the pedicles between the vertebrae are not in the same straight line or plane, but are arranged in a disordered manner in three-dimensional airdrop, the positions of the tail caps of the two pedicle screws that have been driven into the spine are not flush. Most of the existing traditional expanders can only meet the connection of pedicle screws on one plane, and cannot meet the connection of pedicle screws on different planes.

The Chinese invention patent with publication number CN107595377A (publication date: 2018.01.19) discloses a spacing adjustment device for percutaneous pedicle screws. Its two handles are respectively hinged through a first connector, a second connector and The third connecting piece realizes adjustment of the position of the first pressing piece at the end. The first pressing member corresponds to the pedicle screw. However, this solution has certain shortcomings. Specifically, the adjustment of the spatial position through a three-link structure makes the structure of the entire device relatively complex. At the same time, the position adjustment between the three connecting rods needs to be performed during the operation so that the first pressing member is aligned with the two pedicle screws respectively, and after connection, a first locking mechanism, a second locking mechanism and The third locking mechanism fixes the position of the connecting rod, which is cumbersome to operate and increases the difficulty of the operation.

Contents of the invention

In a first aspect, the present invention provides a split-type spinal pedicle screw expansion device, which is connected to the pedicle screws on different planes through two mutually separated handles, and pressurizes the vertebral screws when they are not present. The screws on a plane are adjusted and reset, and the expansion operation is performed, which solves the defects of complex structure and cumbersome operation of the existing solutions in the background technology.

In order to achieve the above purpose, the technical solution adopted by this application is to provide a split spinal pedicle screw expansion device, which includes a first handle and a second handle. The head end of the first handle is provided with a first connecting piece, and the first connecting piece is provided at the head end of the first handle. The head ends of the two handles are provided with a second connector; both the first connector and the second connector are provided with an installation structure for connecting with the pedicle screw tail cap;

The head end of the first handle is provided with a first U-shaped groove. The opening of the first U-shaped groove is disposed in a direction away from the tail end of the first handle. The first U-shaped groove is located on the side of the first connecting member away from the tail end of the first handle. , a rotating shaft is provided between the opposite side walls of the first U-shaped groove; a hook is provided at the head end of the second handle, the hook and the second connecting piece are both arranged toward the same side of the second handle, and the hook is located on the second Between the connecting piece and the rear end of the second handle, the hook is surrounded by an arc-shaped groove that opens in a direction away from the rear end of the second handle;

Pass the hook through the gap between the rotating shaft and the bottom wall of the first U-shaped groove, and place the rotating shaft in the arc-shaped groove; by kneading the first handle and the second handle, the second handle and the first handle use the rotating shaft as the central axis. By relative rotation, the mounting structure on the first connecting piece and the mounting structure on the second connecting piece spread out from each other.

Optionally, the tail end of the second handle is provided with a rack, the rack and the second connecting member both extend toward the same side of the second handle, and the teeth of the rack are arranged toward the direction of the second connecting member; the tail end of the first handle The end is provided with clamping teeth that can be limited to any teeth on the rack.

Optionally, the tail end of the first handle is provided with a U-shaped snap-in groove, the opening of the U-shaped snap-in slot is arranged in a direction away from the head end of the first handle, and the width of the U-shaped snap-in slot is the same as the width of the rack. The latching teeth are located in the U-shaped latching groove, the latching teeth are limited behind the rack, and the rack is limited between two opposite side walls of the U-shaped latching groove.

Optionally, the rack is elastically swingably connected to the second handle.

Optionally, a second U-shaped groove is provided at the tail end of the second handle, the opening of the second U-shaped groove is provided in the direction of the rack, and a hinge shaft is set between opposite side walls of the second U-shaped groove, and the teeth The end of the bar is rotated and sleeved on the outside of the hinge shaft;

It also includes a spring piece, one end of the spring piece is connected to the side wall of the second handle; the other end of the spring piece passes through the gap between the hinge shaft and the bottom wall of the second U-shaped groove, and faces the bottom wall of the second U-shaped groove with the rack. The end walls are in contact.

Optionally, the installation structure is a plug-in column; the plug-in column includes two arc-shaped side walls arranged back to each other and a limiting bump located between the two arc-shaped side walls, and bolts are provided on the arc-shaped side walls. hole;

The plug-in post is used to be plugged into the U-shaped groove in the pedicle screw tail cap, and the arc-shaped side walls fit on the two opposite internally threaded side walls of the U-shaped groove in the pedicle screw tail cap. The limiting bump extends out of the openings on both sides of the U-shaped groove in the tail cap of the pedicle screw.

Optionally, both the first connecting piece and the second connecting piece are hollow with both ends open; one end of the first connecting piece is connected to the first handle, and the mounting structure on the first connecting piece is located away from the first connecting piece. The end of the handle; one end of the second connecting piece is connected to the second handle, and the mounting structure on the second connecting piece is located at the end of the second connecting piece away from the first and second handles.

Optionally, the side wall of the first handle is provided with a groove matching the hand.

In a second aspect, the present invention provides a method for using a split-type spinal pedicle screw distraction device, which allows the screws that are not on the same plane to be adjusted and reset, and performs a distraction operation, and is easy to operate and is not affected by the pedicle screws. Effect of initial screw position.

In order to achieve the above purpose, the technical solution adopted in this application is to provide a method of using a split spinal pedicle screw expansion device, which includes the following steps:

S1: Connect the installation structure on the first connector and the installation structure on the second connector to the tail caps of the pedicle screws at two different positions on the spine that need to be corrected;

S2: Manually adjust the first handle and the second handle so that the hook passes through the gap between the rotating shaft and the bottom wall of the first U-shaped groove, and the rotating shaft is placed in the arc groove; pinch the first handle and the second handle, the second handle and the first handle rotate relative to each other with the rotating shaft as the center axis, and the mounting structure on the first connecting member and the mounting structure on the second connecting member open to each other, completing the spinal distraction and reduction at the positions of the two pedicle screws.

In a third aspect, the present invention provides a method for using a split-type spinal pedicle screw distraction device, which allows the screws that are not on the same plane to be adjusted and reset, and performs a distraction operation, and is easy to operate and is not affected by the pedicle screws. Effect of initial screw position.

In order to achieve the above purpose, the technical solution adopted in this application is to provide a method of using a split spinal pedicle screw expansion device, which includes the following steps:

S1: Connect the installation structure on the first connector and the installation structure on the second connector to the tail caps of the pedicle screws at two different positions on the spine that need to be corrected;

S2: Manually adjust the first handle and the second handle so that the hook passes through the gap between the rotating shaft and the bottom wall of the first U-shaped groove, the rotating shaft is placed in the arc groove, and the teeth are aligned with the rack; pinch the first handle and the second handle. The second handle and the first handle rotate relative to each other with the rotating shaft as the central axis. The teeth slide along the rack. The mounting structure on the first connecting piece and the mounting structure on the second connecting piece open to each other; let go. The rear teeth are limited to the rack to complete the spinal distraction reduction at the positions of the two pedicle screws.

The beneficial effects of the technical solution of this application compared to the existing technology are:

Since the first handle and the second handle are in a separated state before being connected to the pedicle screws, they are not connected, so that the connection between the two handles and the pedicle screws at different positions is very free, and is not affected by the spatial position and is connected with the spine. The degree of adaptation is higher. After the connection with the pedicle screws is completed, the first handle and the second handle are connected manually, specifically by setting the rotating shaft in the arcuate groove to achieve preliminary correction of the spinal position, and then kneading the first handle and the second handle. The second handle completes the expansion operation. Compared with adjusting the position through sequentially articulated connecting rods, the entire device has a simpler structure and operation method, and is more flexible.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

Figure 1 is a schematic structural diagram of the first split spinal pedicle screw distraction device;

Figure 2 is a schematic diagram of the connection structure of the first split spinal pedicle screw distraction device;

Figure 3 is a cross-sectional view of the connection structure between the hook and the rotating shaft;

Figure 4 is a schematic diagram of the installation structure;

Figure 5 is a schematic structural diagram of the second split spinal pedicle screw expansion device;

Figure 6 is a schematic diagram of the connection structure of the second split spinal pedicle screw expansion device.

Icon: 1. First handle; 101. First U-shaped groove; 102. Rotating shaft; 103. Teeth; 104. U-shaped engaging groove; 105. Groove; 2. Second handle; 201. Hook; 202 , arc groove; 203, rack; 204, second U-shaped groove; 205, hinged shaft; 206, spring piece; 31, first connector; 32, second connector; 301, arc side wall; 302, Limiting bump; 303, bolt hole.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

It should be noted that when an element is referred to as being "fixed" or "disposed" to another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

It should be understood that the terms "length", "width", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "top" The orientations or positional relationships indicated by , "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply what is meant. Devices or elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limiting.

Example 1:

This embodiment provides a split spinal pedicle screw expansion device, which is based on Figures 1 to 3 and includes a first handle 1 and a second handle 2. The head end of the first handle 1 is provided with a first connector. 31. The head end of the second handle 2 is provided with a second connecting piece 32 . Both the first connecting member 31 and the second connecting member 32 are provided with mounting structures for connecting with the tail caps of pedicle screws. Among them, the first U-shaped groove 101 is provided at the head end of the first handle 1 , and the opening of the first U-shaped groove 101 is provided in a direction away from the tail end of the first handle 1 . The first U-shaped groove 101 is located at the first connecting piece 31 On the side away from the rear end of the first handle 1, a rotating shaft 102 is provided between the opposite side walls of the first U-shaped groove 101. Matchingly, the head end of the second handle 2 is provided with a hook 201. The hook 201 and the second connector 32 are both arranged toward the same side of the second handle 2. The hook 201 is located between the second connector 32 and the second handle. 2, the hook 201 surrounds an arc-shaped groove 202 with an opening facing away from the rear end of the second handle 2.

The first handle 1 and the second handle 2 are initially in a separated state. During treatment, the mounting structure on the first connector 31 in the first handle 1 and the mounting structure on the second connector 32 in the second handle 2 are respectively connected to the tail caps of the pedicle screws at two different positions at the position to be corrected on the spine. Since the first handle 1 and the second handle 2 are not connected to each other, the connection between the two and the pedicle screws at different positions is very free, not affected by the spatial position, and the degree of adaptation to the spine is higher. Subsequently, the hook 201 is passed through the gap between the rotating shaft 102 and the bottom wall of the first U-shaped groove 101, the rotating shaft 102 is placed in the arc groove 202, and the first handle 1 and the second handle 2 are connected manually to achieve preliminary correction of the spinal position. Then, by pinching the first handle 1 and the second handle 2, the second handle 2 and the first handle 1 are relatively rotated with the rotating shaft 102 as the central axis, and the mounting structure on the first connector 31 and the mounting structure on the second connector 32 are opened to each other to complete the opening operation. Compared with the method of adjusting the position by sequentially hinged connecting rods, the entire device has a simpler structure and operation method, and is more flexible, and can meet the connection correction of pedicle screws on different planes.

It should be noted that after the hook 201 is placed in the arc-shaped groove 202, the first handle 1 and the second handle 2 are not completely connected in the strict sense, but are in a state of mutual borrowing. During the process of kneading the first handle 1 and the second handle 2, the hook 201 is located between the rotating shaft 102 and the bottom wall of the first U-shaped groove 101, and the lateral relative movement of the first handle 1 and the second handle 2 is restricted. Prevent misalignment between the two and ensure the accuracy of the relative position of the two pedicle screws. At the same time, as shown in FIG. 3 , in actual use, the thickness of the hook 201 will be slightly smaller than the distance between the rotating shaft 102 and the bottom wall of the first U-shaped groove 101 . The hook 201 has a certain movable space, that is, there is a certain movable space between the first handle 1 and the second handle 2 to prevent the spines from being too tightly restricted and causing damage to the spine. The first handle 1 and the second handle 2 are connected to the pedicle screws on the spine through the installation structure. When the first handle 1 and the second handle 2 rotate relative to each other, the bottom wall of the first U-shaped groove 101 actually contacts the pedicle screws. The hooks 201 abut each other, and the arc-shaped groove 202 and the rotating shaft 102 only limit rotation.

Further, based on what is shown in Figure 4, the installation structure is a plug-in post. The plug-in column includes two arc-shaped side walls 301 arranged away from each other and a limiting bump 302 located between the two arc-shaped side walls 301. Bolt holes 303 are provided on the arc-shaped side walls 301. When in use, the insertion post is used to be inserted into the U-shaped groove in the pedicle screw tail cap, and the arc-shaped side walls 301 respectively fit into the two opposite internal threads of the U-shaped groove in the pedicle screw tail cap. On the side wall, to ensure the lateral limit of the pedicle screw connection, the limit bumps 302 extend out of the openings on both sides of the U-shaped groove in the pedicle screw tail cap. The limiting bump 302 plays a guiding role during insertion and also limits the rotation between the pedicle screw and the insertion column. When the insertion post is inserted into the tail cap of the pedicle screw, the two are connected through bolts.

Furthermore, the first connecting member 31 and the second connecting member 32 are both hollow with both ends open, and both can be made of tubular material. When the first connecting member 31 and the second connecting member 32 are both connected to the pedicle screw, the screw can be locked and loosened through the hollow interior. One end of the first connecting member 31 is connected to the first handle 1, and the mounting structure on the first connecting member 31 is located at the end of the first connecting member 31 away from the first handle 1. One end of the second connecting member 32 is connected to the second handle 2, and the mounting structure on the second connecting member 32 is located at the end of the second connecting member 32 away from the second handle 2.

Optionally, the side wall of the first handle 1 is provided with a groove 105 that matches the hand to increase the comfort of holding and reduce slippage.

Example 2:

This embodiment provides a split spinal pedicle screw expansion device. Based on the solution of Embodiment 1 and as shown in FIGS. 5 and 6 , a rack 203 is provided at the rear end of the second handle 2 , and both the rack 203 and the second connecting member 32 extend toward the same side of the second handle 2 , the teeth of the rack 203 are arranged toward the direction of the second connecting member 32 . The rear end of the first handle 1 is provided with latch teeth 103 that can be limited to any teeth on the rack 203 . The rack 203 and the second connecting member 32 can be arranged in parallel or at a certain angle.

When the first handle 1 and the second handle 2 are pinched, the latching teeth 103 at the rear end of the first handle 1 slide along the rack 203 at the rear end of the second handle 2. After releasing the handle, the first handle 1 and the second handle 2 cannot rotate relative to each other in the opposite direction due to the engagement of the latching teeth 103 and the rack 203. Under the pressure of the latching teeth 103 and the rack 203, two pedicle screws that are not in a straight line can be adjusted and kept in the same plane without holding the first handle 1 and the second handle 2 all the time, thereby completing the surgical reduction of spinal internal fixation.

Preferably, the tail end of the first handle 1 is provided with a U-shaped snap-in groove 104. The opening of the U-shaped snap-in groove 104 is disposed in a direction away from the head end of the first handle 1. The width of the U-shaped snap-in groove 104 is equal to the width of the rack. 203 have the same width, the latching teeth 103 are located in the U-shaped latching groove 104, the latching teeth 103 are limited behind the rack 203, and the rack 203 is limited between the two opposite side walls of the U-shaped latching groove 104. The arrangement of the U-shaped snap-in groove 104 can prevent lateral relative sliding between the rack 203 and the snap-in teeth 103, prevent the first handle 1 and the second handle 2 from tripping, and ensure the smooth connection between the first handle 1 and the second handle 2. Connection stability.

Further, the rack 203 is elastically swingably connected to the second handle 2 . Specifically, when the second 204 rack 203 is subjected to an external force, it can have a certain swing range, and at the same time, the rack 203 can maintain the position limit of the latch teeth 103 under the action of elasticity. Based on Figures 1 and 2, when the first handle 1 and the second handle 2 are pinched together, the latch teeth 103 slide along the rack 203, and the rack 203 can swing to a certain extent under the action of the above elasticity, ensuring that the latch teeth 103 can Pass through the teeth on rack 203 smoothly. After letting go, the rack 203 is reset under the action of elasticity to prevent the clamping teeth 103 from moving in the opposite direction. In detail, a second U-shaped groove 204 is provided at the rear end of the second handle 2. The opening of the second U-shaped groove 204 is provided in the direction of the rack 203. The end of the hinge shaft 205 and the rack 203 is rotatably sleeved on the outside of the hinge shaft 205 . At the same time, shrapnel 206 is also included. One end of the elastic piece 206 is connected to the side wall of the second handle 2, and may be fixed by screws or direct welding. The other end of the elastic piece 206 passes through the gap between the hinge shaft 205 and the bottom wall of the second U-shaped groove 204 and abuts against the end wall of the rack 203 facing the bottom wall of the second U-shaped groove 204 . When the rack 203 rotates along the hinge axis 205, the elastic piece 206 exerts a reaction force on the rack 203, causing the rack 203 to have a tendency to reset, thereby realizing elastic swing between the rack 203 and the second handle 2.

Preferably, as shown in FIG. 6 , the top end of the rack 203 can be set in an L shape to increase the contact area between the end surface of the rack 203 and the elastic piece 206 to ensure that the elastic piece 206 exerts an elastic force on the end of the rack 203 .

Example 3:

This embodiment provides a method of using the split spinal pedicle screw expansion device shown in Embodiment 1, based on what is shown in Figures 1 to 3, including the following steps:

S1: The mounting structure on the first connecting member 31 and the mounting structure on the second connecting member 32 are respectively connected to the tail caps of two pedicle screws at different positions on the spine that need to be corrected.

Since the first handle 1 and the second handle 2 are not connected to each other, the connection between the first handle 1 and the second handle 2 with the pedicle screws at different positions is very free, is not affected by the spatial position, and has a higher degree of adaptability to the spine.

S2: Manually adjust the first handle 1 and the second handle 2 so that the hook 201 passes through the gap between the rotating shaft 102 and the bottom wall of the first U-shaped groove 101, and the rotating shaft 102 is placed in the arc-shaped groove 202. Knead the first handle 1 and the second handle 2, the second handle 2 and the first handle 1 rotate relative to each other with the rotating shaft 102 as the central axis, and the installation structure on the first connector 31 and the installation structure on the second connector 32 are mutually exclusive. Open and complete the spinal distraction reduction at the two pedicle screw locations.

Specifically, during operation, the hook 201 is placed in the first U-shaped groove 101 through manual calibration. The hook 201 is located between the rotating shaft 102 and the bottom wall of the first U-shaped groove 101. The lateral relative movement of the first handle 1 and the second handle 2 is restricted to prevent misalignment between the two and ensure that the two pedicle screws are Accurate relative position. When the first handle 1 and the second handle 2 rotate relative to each other, the bottom wall of the first U-shaped groove 101 and the hook 201 actually abut each other, and the arc-shaped groove 202 and the rotating shaft 102 only limit rotation. Compared with adjusting the positions of sequentially articulated connecting rods during surgery, the entire method is simpler to operate, has fewer steps, and is very flexible. It can meet the connection and correction of pedicle screws on different planes.

Example 4:

This embodiment provides a method of using the split spinal pedicle screw expansion device shown in Embodiment 2. Based on what is shown in Figures 5 and 6, it includes the following steps:

S1: The mounting structure on the first connecting member 31 and the mounting structure on the second connecting member 32 are respectively connected to the tail caps of two pedicle screws at different positions on the spine that need to be corrected.

Since the first handle 1 and the second handle 2 are not connected to each other, the connection between the first handle 1 and the second handle 2 with the pedicle screws at different positions is very free, is not affected by the spatial position, and has a higher degree of adaptability to the spine.

S2: Manually adjust the first handle 1 and the second handle 2 so that the hook 201 passes through the gap between the rotating shaft 102 and the bottom wall of the first U-shaped groove 101, the rotating shaft 102 is placed in the arc groove 202, and the latch 103 is aligned with the rack 203. Pinch the first handle 1 and the second handle 2, the second handle 2 and the first handle 1 rotate relative to each other with the rotating shaft 102 as the central axis, the latch 103 slides along the rack 203, and the mounting structure on the first connecting member 31 and the mounting structure on the second connecting member 32 open to each other. After releasing the grip, the latch 103 is limited to the rack 203, completing the spinal distraction reduction at the positions of the two pedicle screws.

Specifically, during operation, the hook 201 is placed in the first U-shaped groove 101 through manual calibration. The hook 201 is located between the rotating shaft 102 and the bottom wall of the first U-shaped groove 101. The lateral relative movement of the first handle 1 and the second handle 2 is restricted to prevent misalignment between the two and ensure that the two pedicle screws are Accurate relative position. At the same time, after letting go, the first handle 1 and the second handle 2 cannot rotate relative to each other due to the mutual engagement of the teeth 103 and the rack 203 . Under the pressure of the teeth 103 and the rack 203, the two pedicle screws that are not in a straight line can be adjusted and kept on the same plane without holding the first handle 1 and the second handle 2 all the time. , thereby completing the surgical reduction of spinal internal fixation. The arrangement of the latch 103 and the rack 203 can free the doctor's hands after the reset operation and facilitate other operations.

The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (10)

1. A split-type spinal pedicle screw expansion device, including a first handle (1) and a second handle (2). The head end of the first handle (1) is provided with a first connecting piece (31) , the head end of the second handle (2) is provided with a second connector (32); both the first connector (31) and the second connector (32) are provided with pedicle screws. The installation structure of the tail cap connection; The invention is characterized in that: a first U-shaped groove (101) is provided at the head end of the first handle (1), the opening of the first U-shaped groove (101) is arranged in a direction away from the tail end of the first handle (1), the first U-shaped groove (101) is located on the side of the first connecting member (31) away from the tail end of the first handle (1), and a rotating shaft (102) is arranged between two opposite side walls of the first U-shaped groove (101); a hook (201) is provided at the head end of the second handle (2), the hook (201) and the second connecting member (32) are both arranged in a same side of the second handle (2), the hook (201) is located between the second connecting member (32) and the tail end of the second handle (2), and the hook (201) is surrounded by an arc-shaped groove (202) with an opening in a direction away from the tail end of the second handle (2); Pass the hook (201) through the gap between the rotating shaft (102) and the bottom wall of the first U-shaped groove (101), and place the rotating shaft (102) in the arc-shaped groove (202) ); By kneading the first handle (1) and the second handle (2), the second handle (2) and the first handle (1) take the rotating shaft (102) as the central axis. By relative rotation, the mounting structure on the first connecting piece (31) and the mounting structure on the second connecting piece (32) open to each other. 2. The split spinal pedicle screw expansion device according to claim 1, characterized in that: a rack (203) is provided at the tail end of the second handle (2), and the rack (203) and the second connecting piece (32) both extend toward the same side of the second handle (2), and the teeth of the rack (203) are arranged in the direction of the second connecting piece (32); The rear end of the first handle (1) is provided with latch teeth (103) that can be limited to any teeth on the rack (203). 3. The split spinal pedicle screw expansion device according to claim 2, characterized in that: the tail end of the first handle (1) is provided with a U-shaped snap-in groove (104), and the U-shaped The opening of the snap-in groove (104) is arranged in the direction away from the head end of the first handle (1). The width of the U-shaped snap-in groove (104) is the same as the width of the rack (203). The latch teeth (103) are located in the U-shaped latch groove (104). The latch teeth (103) are limited behind the rack (203). The rack (203) is limited in the U-shaped latch groove (104). between two opposite side walls of the snap-in groove (104). 4. The split spinal pedicle screw expansion device according to claim 2, characterized in that the rack (203) and the second handle (2) are elastically swingably connected. 5. The split spinal pedicle screw distraction device according to claim 4, characterized in that: a second U-shaped groove (204) is provided at the tail end of the second handle (2), the opening of the second U-shaped groove (204) is arranged in the direction of the rack (203), a hinge shaft (205) is arranged between the two opposite side walls of the second U-shaped groove (204), and the end of the rack (203) is rotatably sleeved on the outer side of the hinge shaft (205); It also includes a spring sheet (206), one end of which is connected to the side wall of the second handle (2); the other end of the spring sheet (206) passes through the gap between the hinge shaft (205) and the bottom wall of the second U-shaped groove (204), and abuts against the end wall of the rack (203) facing the bottom wall of the second U-shaped groove (204). 6. The split spinal pedicle screw expansion device according to claim 1, wherein the installation structure is a plug-in column; the plug-in column includes two arc-shaped side walls arranged back to each other. (301) and a limiting bump (302) located between the two arc-shaped side walls (301), with bolt holes (303) provided on the arc-shaped side walls (301); The plug-in column is used to be plugged into the U-shaped groove in the tail cap of the pedicle screw, the arc-shaped side wall (301) is respectively fitted on two opposite internal threaded side walls of the U-shaped groove in the tail cap of the pedicle screw, and the limiting protrusion (302) extends out of the openings on both sides of the U-shaped groove in the tail cap of the pedicle screw. 7. The split spinal pedicle screw distraction device as described in claim 1 is characterized in that: the first connecting member (31) and the second connecting member (32) are both hollow with both ends open; one end of the first connecting member (31) is connected to the first handle (1), and the mounting structure on the first connecting member (31) is located at the end of the first connecting member (31) away from the first handle (1); one end of the second connecting member (32) is connected to the second handle (2), and the mounting structure on the second connecting member (32) is located at the end of the second connecting member (32) away from the first handle. 8. The split spinal pedicle screw expansion device according to claim 1, characterized in that: the side wall of the first handle (1) is provided with a groove (105) matching the hand. 9. The method for using the split spinal pedicle screw distraction device as claimed in claim 1, characterized in that it comprises the following steps: S1: Connect the installation structure on the first connector (31) and the installation structure on the second connector (32) to the tail caps of the pedicle screws at two different positions on the spine that need to be corrected; S2: Manually adjust the first handle (1) and the second handle (2) so that the hook (201) passes through the gap between the rotating shaft (102) and the bottom wall of the first U-shaped groove (101), and the rotating shaft (102) is placed in the arc groove (202); pinch the first handle (1) and the second handle (2), the second handle (2) and the first handle (1) rotate relative to each other with the rotating shaft (102) as the central axis, and the mounting structure on the first connecting member (31) and the mounting structure on the second connecting member (32) are opened to each other, thereby completing the spinal column distraction and reduction at the positions of the two pedicle screws. 10. The method of using the split spinal pedicle screw expansion device according to claim 2, characterized in that it includes the following steps: S1: Connect the installation structure on the first connector (31) and the installation structure on the second connector (32) to the tail caps of the pedicle screws at two different positions on the spine that need to be corrected; S2: Manually adjust the first handle (1) and the second handle (2) so that the hook (201) passes through the gap between the rotating shaft (102) and the bottom wall of the first U-shaped groove (101). The rotating shaft (102) ) is placed in the arc groove (202), and the teeth (103) are aligned with the rack (203); pinch the first handle (1) and the second handle (2), and the second handle (2) and the first handle (1 ) perform relative rotation with the rotating shaft (102) as the central axis, the teeth (103) slide along the rack (203), and the mounting structure on the first connecting piece (31) and the mounting structure on the second connecting piece (32) are mutually exclusive. Open; after releasing, the latch teeth (103) are limited to the rack (203), completing the spinal expansion and reduction at the positions of the two pedicle screws.