Distraction instrument for centrum collapse reduction

Abstract

The distraction instrument is characterized in that the distraction instrument comprises a distraction unit and a grasping unit, the distraction unit comprises a distraction body and a pressurizing rotating shaft, screw holes with opposite thread directions are formed in the two ends of the distraction body respectively, and the grasping unit is arranged on the distraction body. The two ends of the pressurizing rotating shaft are in threaded connection with corresponding screw holes of the distraction body respectively, the distraction body is provided with an upper supporting piece and a lower supporting piece, the grasping unit comprises a grasping device and a locking sleeve, the head of the grasping device grasps the tail of the distraction body, the periphery of the grasping device is sleeved with the locking sleeve, and the locking sleeve is sleeved with the pressurizing rotating shaft. The locking sleeve is rotated to enable the grabber and the distraction body to be locked, the pressurizing rotating shaft is rotated, and the upper supporting piece and the lower supporting piece expand outwards at the same time to be used for supporting a collapsed vertebral body and resetting the collapsed vertebral body. The distraction device is simple in structure and convenient to operate, the distraction force value is large, the distraction height can meet the operation requirement, meanwhile, the distraction structure is stable and reliable, and retraction and retreating are convenient after distraction.

Description

Technical Field

[0001] The invention relates to a distraction device, in particular to a distraction device used for vertebral collapse reduction, belonging to the technical field of orthopedics. Background Art

[0002] In orthopedic clinical practice, we often encounter patients whose vertebral fractures and collapses are caused by unexpected circumstances, and at this time, the application scenario of vertebral expansion and reduction is required. The current methods are: First, for fracture collapse that can be reduced by incision, some surgical instruments such as pry bars are often used to reduce the collapsed part during open surgery. Second, for the collapse of the spine, since direct reduction is not possible, instruments such as balloons can be used to perform reduction surgery in special instrument channels. The specific method is: by establishing a channel, the polymer balloon is sent to the collapsed part of the vertebral fracture, and saline or air is injected into the hollow catheter of the balloon to expand the balloon to achieve the effect of expanding the collapsed vertebra.

[0003] The above methods all have certain limitations. If open surgery is used for reduction, the trauma surface of the open reduction surgery is large, the patient's postoperative recovery time is long, and the risk of infection is relatively high. If a balloon expansion reduction method is used, the balloon relies on pressurizing the liquid and gas filled with it, and relies on liquid pressure (gas pressure) to expand and reduce. Since both liquid and gas are compressible, the expansion force they can provide is not very large. Moreover, the balloon is made of polymer materials. If the bone is hard and sharp, there is a risk of puncturing the balloon. In addition, if the pressure of the injected liquid and gas is too high and exceeds the balloon pressure limit, there is also a risk of balloon rupture. Once the balloon ruptures, the gas or liquid in the balloon will also invade the human body and cause infection.

[0004] Therefore, it is necessary to design a product that can be minimally invasive, has a large expansion force, a expansion height that is sufficient to meet surgical requirements, and can be retracted after expansion, preferably with a mechanically rigid connection, to meet the needs of clinical use. Summary of the invention

[0005] The purpose of the present invention is to provide a distraction device for vertebral collapse reduction which is not only simple in structure and easy to operate, but also has a large distraction force and a distraction height that meets surgical requirements, while having a stable and reliable distraction structure and being easy to retract and withdraw after distraction.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a distraction device for vertebral collapse reduction, the innovation of which is: comprising a distraction unit and a gripping unit for clamping the distraction unit,

[0007] The expansion unit comprises an expansion body and a pressurizing rotating shaft, wherein two ends of the expansion body are respectively provided with screw holes with opposite thread directions, the pressurizing rotating shaft is arranged inside the expansion body, and the two ends of the pressurizing rotating shaft are respectively threadedly connected with the screw holes corresponding to the expansion body,

[0008] The expansion body comprises an upper support sheet and a lower support sheet which expand outward and are in an expanded state.

[0009] The gripping unit comprises a gripper and a locking sleeve. The head of the gripper grips the tail of the expanded body. The locking sleeve is sleeved on the outer circumference of the gripper. The locking sleeve is rotated to lock the gripper and the expanded body.

[0010] By rotating the pressurizing rotating shaft, the two ends of the expansion body are pressed toward the middle at the same time, so that the upper supporting piece and the lower supporting piece of the expansion body are expanded outward at the same time, so as to support the collapsed vertebral body and reset it.

[0011] In the above technical solution, the support body also includes a head and a tail which are connected to the upper support plate and the lower support plate as a whole. The head and the tail are respectively provided with screw holes which are threadedly connected with the pressurized rotating shaft. The tail of the pressurized rotating shaft is provided with a hexagonal inner hole which is convenient for inserting a screwdriver to form a mating connection.

[0012] In the above technical solution, four elastic grooves for reducing the local structural strength are respectively provided on both sides of the upper support plate and the lower support plate and along their length direction. The pressurized rotating shaft is rotated so that the upper support plate and the lower support plate expand outward through the guide mechanism provided inside the support body and are lifted up and bent toward the middle to form three equilateral support plates.

[0013] In the above technical solution, the guide mechanism includes an upper guide column and a lower guide column, a plurality of guide ring grooves are provided on the outer peripheral wall of the pressurized rotating shaft, two upper guide columns are provided on the upper support plate, and two lower guide columns are provided on the lower support plate, and the upper guide columns and the lower guide columns are respectively slidably matched in the corresponding guide ring grooves, and the pressurized rotating shaft is rotated, and under the guidance of the upper guide columns and the lower guide columns, it slides in the opposite direction along the guide ring grooves, so that the upper support plate and the lower support plate expand outward and bend into three equilateral support plates, one of which is horizontal, and the remaining two support plates are located at both ends of the horizontal support plate and form an angle.

[0014] In the above technical solution, the upper support plate and the lower support plate are simultaneously stretched outwards through a guide plane formed by four guide pillars, wherein the two upper guide pillars and the two lower guide pillars are arranged diagonally.

[0015] In the above technical solution, the outer side surfaces of the upper support plate and the lower support plate are provided with a plurality of anti-skid grooves for preventing displacement or slipping.

[0016] In the above technical solution, the anti-slip groove is a V-shaped groove, the included angle of the V-shaped groove is 40° to 90°, and the groove spacing is 0.5 mm to 5 mm.

[0017] In the above technical solution, elastic grooves are respectively provided at both ends of the upper support piece and the lower support piece, near the head and the tail, for reducing the structural strength of the connecting part and increasing the flexibility of the bending part of the support piece. The notch direction of the elastic groove is opposite to the notch direction of the elastic groove on the upper support piece and the lower support piece.

[0018] In the above technical solution, clamping grooves are provided on both sides of the tail of the support body, and positioning holes are provided in the clamping grooves. The head of the gripper has a pair of V-shaped elastic clamping plates, and positioning protrusions are provided on the inner side walls of the elastic clamping plates. The locking sleeve is rotated to constrain the elastic clamping plates of the gripper to move closer and contract. At the same time, the positioning protrusions on the elastic clamping plates are tightly matched with the positioning holes, so that the gripper and the support body are locked.

[0019] In the above technical solution, the gripper includes a hollow tube, a handle is provided at the tail of the hollow tube, and the interior of the hollow tube is a screwdriver channel, the head of the locking sleeve is a conical tube, and the locking sleeve is sleeved on the outer circumference of the hollow tube and threadedly connected thereto.

[0020] The positive effect of the present invention is that after the distraction device for vertebral collapse reduction of the present invention is used, since the present invention includes a distraction unit and a gripping unit for clamping the distraction unit,

[0021] The expansion unit comprises an expansion body and a pressurizing rotating shaft, wherein two ends of the expansion body are respectively provided with screw holes with opposite thread directions, the pressurizing rotating shaft is arranged inside the expansion body, and the two ends of the pressurizing rotating shaft are respectively threadedly connected with the screw holes corresponding to the expansion body,

[0022] The expansion body comprises an upper support sheet and a lower support sheet which expand outward and are in an expanded state.

[0023] The gripping unit comprises a gripper and a locking sleeve. The head of the gripper grips the tail of the expanded body. The locking sleeve is sleeved on the outer circumference of the gripper. The locking sleeve is rotated to lock the gripper and the expanded body.

[0024] By rotating the pressurizing rotating shaft, the two ends of the expansion body are pressed toward the middle at the same time, so that the upper supporting piece and the lower supporting piece of the expansion body are expanded outward at the same time, so as to support the collapsed vertebral body and reset it.

[0025] The specific operation steps of the present invention are: pre-establishing a vertebral support and reduction channel,

[0026] The gripper head of the gripping unit grips the tail of the expansion body, and the locking sleeve is rotated to lock the gripper with the expansion body. The expansion body is put into the channel by the gripper and is located below the collapsed vertebral body. At this time, the pressurizing rotating shaft is rotated, and the two ends of the expansion body are squeezed toward the middle at the same time, that is, the two ends of the expansion body move horizontally in opposite directions (relatively) at the same time, so that the upper support plate and the lower support plate of the expansion body expand outward at the same time to support the collapsed vertebral body to complete the vertebral body reduction.

[0027] After the vertebral body is reset, the pressurizing rotating shaft is rotated in the reverse direction, and the upper supporting piece and the lower supporting piece of the expansion body are retracted to return to the initial state and exit the channel.

[0028] The fixation of the vertebral body after reduction is completed by injecting bone cement into the channel.

[0029] The present invention is a mechanical rigid connection product that can be used to reposition collapsed vertebral bodies in a minimally invasive manner. It is not only simple in structure and easy to operate, but also has a large expansion force value and an expansion height that meets surgical requirements. At the same time, the expanded structure is stable and reliable, and it is easy to retract and exit after expansion. While meeting the needs of clinical surgery, it also improves the existing solutions, such as insufficient expansion force of soft balloons, excessive pressurization pressure, which can also cause product rupture and the risk of patient injury and infection. At the same time, the use of this minimally invasive method for reduction also overcomes the defects of the existing technology, such as the large trauma surface of open reduction surgery, the long recovery time of patients after surgery, and the relatively high risk of infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention;

[0031] Figure 2 It is a schematic diagram of the state when the locking sleeve of the present invention is loosened;

[0032] Figure 3 It is a schematic diagram of the state when the locking sleeve of the present invention is locked (necked);

[0033] Figure 4 It is a structural schematic diagram of the propping unit of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure after the expansion unit of the present invention is expanded;

[0035] Figure 6 It is a schematic diagram of the three-dimensional structure of the expansion unit of the present invention;

[0036] Figure 7 yes Figure 6 Schematic diagram of another direction. DETAILED DESCRIPTION

[0037] The present invention is further described below with reference to the accompanying drawings and given embodiments, but is not limited thereto.

[0038] like Figure 1 , 2 , 3, 4, 5, 6, and 7 show a distraction device for vertebral collapse reduction, comprising a distraction unit and a gripping unit for clamping the distraction unit.

[0039] The expansion unit comprises an expansion body 1 and a pressurizing rotating shaft 2. The expansion body 1 has screw holes with opposite thread directions at both ends. The pressurizing rotating shaft 2 is arranged inside the expansion body 1, and the two ends of the pressurizing rotating shaft 2 are respectively threadedly connected with the screw holes corresponding to the expansion body 1.

[0040] The expansion body 1 comprises an upper support piece 11 and a lower support piece 12 which are expanded outward and in an expanded state.

[0041] The gripping unit comprises a gripper 3 and a locking sleeve 4. The head of the gripper 3 grips the tail of the expanded body 1. The locking sleeve 4 is sleeved on the outer circumference of the gripper 3. The locking sleeve 4 is rotated to lock the gripper 3 with the expanded body 1.

[0042] By rotating the pressurizing rotating shaft 2, the two ends of the expansion body 1 are pressed toward the middle at the same time, so that the upper supporting piece 11 and the lower supporting piece 12 of the expansion body 1 are expanded outward at the same time, so as to support the collapsed vertebral body and reset it.

[0043] Further, such as Figure 6 , 7 As shown, the expansion body 1 is a rectangular parallelepiped structure as a whole, and is hollow inside. At the same time, the screw holes at both ends of the expansion body 1 are of different sizes (different diameters) and the same pitch, that is, the screw hole at the head end is smaller than the screw hole at the tail end. The advantage of this design is that since the expansion body is a rectangular parallelepiped structure, it is convenient to enter the collapsed part of the vertebral body through a minimally invasive channel, and the screw hole is small in front and large in the back, which is convenient for assembly with the pressurized rotating shaft.

[0044] Further, such as Figure 4 , 5 As shown in , 6 and 7, in order to make the structure more reasonable and to form a stable connection with the pressurized rotating shaft, and to enable the support sheet to be stretched by rotating the pressurized rotating shaft, the stretching body 1 also includes a head 13 and a tail 14 which are connected to the upper support sheet 11 and the lower support sheet 12 at the same time, and the head 13 and the tail 14 are respectively provided with screw holes which are threadedly connected with the pressurized rotating shaft 2, and in order to facilitate the insertion of a screwdriver and control the rotation of the pressurized rotating shaft, the tail of the pressurized rotating shaft 2 is provided with a hexagonal inner hole which is convenient for the insertion of a screwdriver to form a matching connection.

[0045] Further, such as Figure 6 ,7 As shown, in order to reduce the local structural strength of the support sheet and realize the structural form when the support sheet is stretched, four elastic grooves 15 for reducing the local structural strength are respectively provided on both sides of the upper support sheet 11 and the lower support sheet 12 and along their length direction. The pressurizing rotating shaft 2 is rotated so that the upper support sheet 11 and the lower support sheet 12 are expanded outward through the guide mechanism provided inside the stretching body 1 and bent into three sections of equilateral support sheets. The structural form of the support sheet after being supported by the present invention is similar to a trapezoidal shape, which ensures the stability and stability of the support sheet after being stretched, and is not prone to collapse, making the stretching structure more reliable.

[0046] Further, such as Figure 6 , 7 As shown, in order to ensure the shape of the support plate after support and to effectively reposition the collapsed vertebral body, the guide mechanism of the present invention includes an upper guide column 51 and a lower guide column 52, and a plurality of guide ring grooves are provided on the outer peripheral wall of the pressurized rotating shaft 2, and two upper guide columns 51 are provided on the upper support plate 11, and two lower guide columns 52 are provided on the lower support plate 12, and the upper guide columns 51 and the lower guide columns 52 are respectively slidably matched in the corresponding guide ring grooves, and the pressurized rotating shaft 2 is rotated, and slides in the opposite direction (back to back) along the guide ring grooves under the guidance of the upper guide columns 51 and the lower guide columns 52, so that the upper support plate 11 and the lower support plate 12 expand outward and are lifted up and bent toward the middle to form three equilateral support plates, one of which is horizontal, and the remaining two support plates are located at both ends of the horizontal support plate and form an angle.

[0047] Further, such as Figure 5 As shown, in order to make the support sheet support outward more stably and avoid partial inadequate support, the upper support sheet 11 and the lower support sheet 12 are simultaneously stretched outward through the guide plane formed by four guide pillars, wherein the two upper guide pillars 51 and the two lower guide pillars 51 are arranged diagonally and in parallel. The purpose of this arrangement is to ensure that the middle part of the upper and lower support sheets is always in a horizontal state during the stretching process, to avoid unevenness due to uneven force, and the horizontal support sheet can increase the contact area with the collapsed vertebral body, to prevent the vertebral body from collapsing due to excessive local pressure and causing poor stretching effect.

[0048] Further, such as Figure 4 , 5 As shown in FIGS. 6 and 7 , in order to prevent the expansion body from moving or slipping in the expansion position, the outer side surfaces of the upper support plate 11 and the lower support plate 12 are provided with a plurality of anti-skid grooves 6 for preventing displacement or slipping.

[0049] Furthermore, in order to further improve the rationality of the structure, the anti-slip groove 6 is a V-shaped groove, the angle of the V-shaped groove is 40° to 90°, and the groove spacing is 0.5 mm to 5 mm.

[0050] Further, such as Figure 4 , 5 As shown, in order to make the structure more reasonable, elastic grooves 7 are respectively provided at both ends of the upper support sheet 11 and the lower support sheet 12 and near the head 13 and the tail 14 to reduce the structural strength of the connection part and increase the flexibility of the support sheet bending part. The notch direction of the elastic groove 7 is opposite to the notch direction of the elastic groove 15 on the upper support sheet 11 and the lower support sheet 12. The purpose of this design is that when the pressurizing rotating shaft rotates, the head 13 part of the opening body 1 moves backward and the tail 14 part moves forward. Under the action of two thrusts, the elastic groove 7 and the elastic groove 15 will bend elastically, thereby achieving the effect of the support sheet being opened.

[0051] Further, such as Figure 2 , 3 As shown in , 6, and 7, in order to facilitate the gripper to grip the open body, the two sides of the tail of the open body 1 are provided with clamping grooves 16, and the clamping grooves 16 have positioning holes. The head of the gripper 3 is machined with a pair of symmetrically arranged notches, and there is a round hole in the notch, and the depth of the round hole is lower than the notch plane, which is convenient for the clamping and disassembly of the instrument. Thus, a pair of V-shaped elastic clamping pieces 31 are constructed, and the inner side wall of the elastic clamping piece 31 is provided with a positioning protrusion 34. When there is no locking sleeve 4 to restrain, the elastic clamping piece 31 opens to both sides, and the locking sleeve 4 is rotated to constrain the elastic clamping piece 31 of the gripper 3 to move closer and shrink. At the same time, the positioning protrusion 34 on the elastic clamping piece 31 is tightly matched with the positioning hole, so that the gripper 3 and the open body 1 are locked.

[0052] Further, such as Figure 2 , 3 As shown, in order to facilitate the operation of the gripper, the gripper 3 includes a hollow tube 32, a handle 33 is provided at the tail of the hollow tube 32, and the interior of the hollow tube 32 is a screwdriver channel. The screwdriver enters through the hollow tube of the gripper 3 and is inserted into the inner six holes of the pressurized rotating shaft 2 to rotate it.

[0053] Further, such as Figure 2 , 3 As shown, the head of the locking sleeve 4 is a tapered tube, and the outside of the hollow tube 32 is provided with a locking thread, the inside of the locking sleeve 4 has a threaded groove, the locking sleeve 4 is sleeved on the outer periphery of the hollow tube 32 and is threadedly connected thereto, the locking sleeve 4 is rotated to move toward the head of the hollow tube 32, and the tapered tube at the head of the locking sleeve 4 can constrain a pair of elastic clamping sheets to move closer and lock them at the tail of the expanded body.

[0054] The specific steps of operation of the present invention are:

[0055] Establish the vertebral support reduction channel in advance.

[0056] The elastic clamping piece 31 of the gripper 3 is gripped at the clamping groove 16 at the rear of the main body 1 (such as Figure 2 As shown), the locking sleeve 4 is rotated to move the locking sleeve 4 toward the head of the hollow tube 32, and the tapered tube at the head of the locking sleeve 4 can constrain a pair of elastic clamping pieces 31 to be close and locked at the tail of the expanded body 1, and at the same time, the positioning protrusion 34 on the elastic clamping piece 31 is tightly matched with the positioning hole, so that the gripper 3 and the expanded body 1 are locked (as shown). Figure 3 As shown in the figure, the expansion body 1 is sent into the channel by the gripper 3 and is located below the collapsed vertebral body. At this time, the pressurized rotating shaft 2 is rotated, and the two ends of the expansion body 1 are squeezed toward the middle at the same time, that is, the two ends of the expansion body are moved horizontally in opposite directions (relatively) at the same time, so that the upper support sheet 11 and the lower support sheet 12 of the expansion body 1 are expanded outward at the same time, and under the guidance of the upper guide column 51 and the lower guide column 52, they slide back to back along the guide ring groove. During the expansion process, the middle parts of the upper and lower support sheets are always in a horizontal state, avoiding unevenness due to uneven force, and finally making the upper support sheet 11 and the lower support sheet 12 expand outward and be lifted up in the middle and bent into three equilateral support sheets (as shown in the figure). Figure 5 As shown), it is used to support the collapsed vertebral body and complete vertebral reduction.

[0057] After the vertebral body is reset, the pressurizing rotating shaft 2 is rotated in the reverse direction, and the upper supporting piece 11 and the lower supporting piece 12 of the expansion body 1 are retracted and restored to the initial state (such as Figure 4 As shown), and exit the channel,

[0058] The fixation of the vertebral body after reduction is completed by injecting bone cement into the channel.

[0059] Of course, the expansion unit of the present invention can also be used as a vertebral replacement component and implanted in the body, and the expansion body is placed at the vertebral part that needs to be replaced. The overall height of the upper and lower support plates after expansion is adjusted according to surgical requirements, and the upper and lower support plates are respectively abutted against adjacent vertebrae and are not easily displaced.

[0060] The present invention is a mechanical rigid connection product that can be used to reposition collapsed vertebral bodies in a minimally invasive manner. It is not only simple in structure and easy to operate, but also has a large expansion force value and an expansion height that meets surgical requirements. At the same time, the expanded structure is stable and reliable, and it is easy to retract and exit after expansion, meeting clinical surgical needs. At the same time, the use of this minimally invasive method for reduction also overcomes the defects of the existing open reduction surgery in the prior art, such as a large trauma surface, a long recovery time for patients after surgery, and a relatively high risk of infection.

[0061] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A distraction device for vertebral collapse reduction, characterized in that: It comprises an expansion unit and a gripping unit for clamping the expansion unit. The expansion unit comprises an expansion body (1) and a pressurizing rotating shaft (2), wherein the expansion body (1) is provided with screw holes with opposite thread directions at both ends, the pressurizing rotating shaft (2) is arranged inside the expansion body (1), and the two ends of the pressurizing rotating shaft (2) are respectively threadedly connected to the corresponding screw holes of the expansion body (1). The expansion body (1) comprises an upper support piece (11) and a lower support piece (12) which are expanded outward and in an expanded state. The gripping unit comprises a gripper (3) and a locking sleeve (4); the head of the gripper (3) grips the tail of the expanded body (1); the locking sleeve (4) is sleeved on the outer circumference of the gripper (3); the locking sleeve (4) is rotated to lock the gripper (3) with the expanded body (1); By rotating the pressurizing rotating shaft (2), the two ends of the expansion body (1) are simultaneously pressed toward the middle, so that the upper supporting piece (11) and the lower supporting piece (12) of the expansion body (1) are simultaneously expanded outwards, so as to support the collapsed vertebral body and reposition it.

2. The distraction device for vertebral collapse reduction according to claim 1, characterized in that: The expansion body (1) further comprises a head portion (13) and a tail portion (14) which are connected to the upper support plate (11) and the lower support plate (12) as a whole, the head portion (13) and the tail portion (14) are respectively provided with screw holes which are threadedly connected to the pressurizing rotating shaft (2), and the tail portion of the pressurizing rotating shaft (2) is provided with a hexagonal inner hole which is convenient for a screwdriver to be inserted into to form a mating connection.

3. The distraction device for vertebral collapse reduction according to claim 1, characterized in that: Four elastic grooves (15) for reducing the local structural strength are respectively provided on both sides of the upper support sheet (11) and the lower support sheet (12) and along their length direction. The pressurizing rotating shaft (2) is rotated so that the upper support sheet (11) and the lower support sheet (12) are expanded outward through a guide mechanism provided inside the support body (1) and are bent into three equilateral support sheets, one of which is horizontal, and the remaining two support sheets are located at both ends of the horizontal support sheet and form an angle.

4. The distraction device for vertebral collapse reduction according to claim 3, characterized in that: The guide mechanism comprises an upper guide column (51) and a lower guide column (52); a plurality of guide ring grooves are provided on the outer peripheral wall of the pressurizing rotating shaft (2); two upper guide columns (51) are provided on the upper support plate (11); two lower guide columns (52) are provided on the lower support plate (12); and the upper guide columns (51) and the lower guide columns (52) are respectively slidably matched in the corresponding guide ring grooves; the pressurizing rotating shaft (2) is rotated, and under the guiding action of the upper guide columns (51) and the lower guide columns (52), the upper support plate (11) and the lower support plate (12) are reversely slid along the guide ring grooves, so that the upper support plate (11) and the lower support plate (12) are expanded outwards and lifted up in the middle and bent into three sections of equilateral support plates.

5. The distraction device for vertebral collapse reduction according to claim 4, characterized in that: The upper support plate (11) and the lower support plate (12) are simultaneously stretched outwards through a guide plane formed by four guide pillars, wherein the two upper guide pillars (51) and the two lower guide pillars (51) are arranged diagonally.

6. The distraction device for vertebral collapse reduction according to claim 1, characterized in that: The outer side surfaces of the upper support plate (11) and the lower support plate (12) are both provided with a plurality of anti-skid grooves (6) for preventing displacement or slipping.

7. The distraction device for vertebral collapse reduction according to claim 6, characterized in that: The anti-slip groove (6) is a V-shaped groove, the included angle of the V-shaped groove is 40° to 90°, and the groove spacing is 0.5 mm to 5 mm.

8. The distraction device for vertebral collapse reduction according to claim 2, characterized in that: Elastic grooves (7) for reducing the structural strength of the connection parts and increasing the flexibility of the bending parts of the support pieces are respectively provided at both ends of the upper support piece (11) and the lower support piece (12) and near the head part (13) and the tail part (14), and the notch direction of the elastic groove (7) is opposite to the notch direction of the elastic groove (15) on the upper support piece (11) and the lower support piece (12).

9. The distraction device for vertebral collapse reduction according to claim 1, characterized in that: The rear end of the expansion body (1) is provided with clamping grooves (16) on both sides, and the clamping grooves (16) have positioning holes. The head of the gripper (3) has a pair of V-shaped elastic clamping pieces (31), and the inner side walls of the elastic clamping pieces (31) are provided with positioning protrusions (34). The locking sleeve (4) is rotated to constrain the elastic clamping pieces (31) of the gripper (3) to move closer and contract. At the same time, the positioning protrusions (34) on the elastic clamping pieces (31) are tightly matched with the positioning holes, so that the gripper (3) and the expansion body (1) are locked.

10. The distraction device for vertebral collapse reduction according to claim 1, characterized in that: The gripper (3) comprises a hollow tube (32), a handle (33) is provided at the tail of the hollow tube (32), and the interior of the hollow tube (32) is a screwdriver channel, the head of the locking sleeve (4) is a conical tube, and the locking sleeve (4) is sleeved on the outer circumference of the hollow tube (32) and is threadedly connected thereto.

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