Distraction instrument for centrum collapse reduction
By designing the opening and gripping units of the opening device, and utilizing threaded connections and guide mechanisms to expand the upper and lower support plates, the problems of insufficient surgical force and easy rupture of balloons in minimally invasive surgery during vertebral fracture collapse reduction are solved, achieving a stable and reliable vertebral reduction effect.
Patent Information
- Application Number
- CN202423152907.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2034-12-19
AI Technical Summary
Existing techniques for reducing vertebral fractures and collapses pose risks of large trauma from open surgery and insufficient opening force and easy rupture of balloons in minimally invasive surgery, thus failing to meet clinical needs.
Design a spreading device, including a spreading unit and a gripping unit. The spreading unit consists of a spreading body and a pressure rotating shaft. The upper and lower support plates are expanded through threaded connection and guide mechanism to support the collapsed vertebral body, and a stable connection is formed with the gripper through a locking sleeve.
It achieves vertebral repositioning with high dislocation force and stable dislocation height under minimally invasive methods, overcoming the risks of large trauma and easy rupture of balloons in open surgery, and meeting the needs of clinical surgery.
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Figure CN223914188U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a distraction instrument, particularly to a distraction instrument for vertebral body collapse reset, belongs to orthopedics technical field. BACKGROUND
[0002] In orthopedic medical clinic, often encounter some because of accidental situation causes vertebral body fracture collapse patient, at this moment need to carry out vertebral body distraction reset application scene. The method currently adopted has: first, for the fracture collapse that can carry out incision reset, often in open operation, use some prying stick surgical instrument to reset the collapse part. Second, for the collapse of the spine, because cannot carry out direct reset, can use balloon and so on instrument in special instrument channel reset operation. The specific method is: through the establishment channel, send the high polymer balloon to the vertebral body fracture collapse, inject physiological saline or air in the balloon hollow catheter, make the balloon inflation, to achieve the effect of distraction collapse vertebral body.
[0003] The above method has certain limitation, if adopting open operation reset, open type reset operation trauma is bigger, patient postoperative recovery time is long, makes its infection risk also relatively higher. If using balloon distraction reset mode, balloon relies on the liquid and gas filled to carry out pressurization, relies on liquid pressure (gas pressure) distraction reset, because liquid and gas all have compressibility, therefore can provide distraction force is not very big, and balloon is made of high polymer material, if bone quality is relatively sharp, then there will be the risk of pricking the balloon. In addition, if the liquid and gas injection pressure is too large, exceeds the balloon pressure limit, also can have the risk of balloon rupture, once the balloon ruptures, the gas or liquid in the balloon also can invade into the human body, causes infection.
[0004] Therefore, it is necessary to design a product design that can be used in a minimally invasive way, has a larger distraction force value, a sufficient distraction height that meets the operation requirements, and can be retracted after distraction, preferably a mechanical rigid connection, to meet the needs of clinical use. SUMMARY
[0005] The utility model aims at providing a distraction instrument for vertebral body collapse reset, which is not only simple in structure and easy to operate, but also has a larger distraction force value, a sufficient distraction height that meets the operation requirements, a stable and reliable distraction structure, and is convenient to retract and exit after distraction.
[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a distraction instrument for vertebral body collapse reset, the innovation point of which is that it comprises 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, two ends of the expansion body are respectively provided with screw holes with opposite screw directions, the pressurizing rotating shaft is arranged in the interior of the expansion body, and two ends of the pressurizing rotating shaft are respectively threadedly connected with the corresponding screw holes of the expansion body,
[0008] The expansion body has upper and lower support pieces which are expanded to the outside and 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 expansion body, the locking sleeve is sleeved on the outer periphery of the gripper, and rotating the locking sleeve makes the gripper and the expansion body form locking,
[0010] Rotating the pressurizing rotating shaft, the two ends of the expansion body are simultaneously extruded to the middle, so that the upper and lower support pieces of the expansion body are simultaneously expanded to the outside, so as to support and reset the collapsed vertebral body.
[0011] In the above technical solution, the expansion body further comprises a head and a tail which are simultaneously connected with the upper and lower support pieces, the head and the tail are respectively provided with screw holes which are threadedly connected with the pressurizing rotating shaft, and the tail of the pressurizing rotating shaft is provided with a hexagonal inner hole which is convenient for the insertion of a pick to form a matched connection.
[0012] In the above technical solution, the two sides of the upper and lower support pieces are respectively provided with four elastic grooves which are arranged along the length direction and used to reduce the local structural strength, and rotating the pressurizing rotating shaft makes the upper and lower support pieces expand to the outside and be bent to three equilateral support pieces by a guide mechanism arranged in the interior of the expansion body.
[0013] In the above technical solution, the guide mechanism comprises upper and lower guide columns, a plurality of guide ring grooves are arranged on the outer peripheral wall of the pressurizing rotating shaft, two upper guide columns are arranged on the upper support piece, two lower guide columns are arranged on the lower support piece, and the upper and lower guide columns are respectively slidably matched in the corresponding guide ring grooves, rotating the pressurizing rotating shaft makes the upper and lower guide columns reversely slide along the guide ring grooves under the guidance of the guide ring grooves, so that the upper and lower support pieces expand to the outside and are bent to three equilateral support pieces, one of which is in a horizontal state, and the remaining two are located at the two ends of the horizontal support piece and form an included angle.
[0014] In the above technical solution, the upper and lower support pieces are simultaneously expanded to the outside by a guide plane formed by four guide columns, and the two upper guide columns and the two lower guide columns are diagonally arranged.
[0015] In the above technical solution, the outer sides of the upper and lower support pieces are respectively provided with a plurality of anti-skid grooves which are used to prevent displacement or slipping.
[0016] In the above technical scheme, the anti-skid groove is a V-shaped groove, the included angle of the V-shaped groove is 40-90 degrees, and the groove spacing is 0.5-5 mm.
[0017] In the above technical scheme, two ends of the upper support sheet and the lower support sheet and close to the head and the tail are respectively provided with elastic grooves for reducing the structural strength of the joint part and increasing the flexibility of the bending part of the support sheet, and the groove direction of the elastic groove is opposite to the notch direction of the elastic groove on the upper support sheet and the lower support sheet.
[0018] In the above technical scheme, the tail of the expansion main body is provided with clamping grooves, the clamping grooves are provided with positioning holes, the head of the gripper is provided with a pair of V-shaped elastic clamping sheets, the inner side wall of the elastic clamping sheet is provided with a positioning protrusion, the elastic clamping sheet of the gripper is closed and shrunk by rotating the locking sleeve, and the positioning protrusion on the elastic clamping sheet is tightly matched with the positioning hole, so that the gripper and the expansion main body are locked.
[0019] In the above technical scheme, the gripper comprises a hollow pipe, the tail of the hollow pipe is provided with a handle, and the inside of the hollow pipe is a screwdriver channel, the head of the locking sleeve is a tapered pipe, and the locking sleeve is sleeved on the outer periphery of the hollow pipe and is threadedly connected with the hollow pipe.
[0020] The utility model has the following positive effects: after the expansion instrument for the vertebral body collapse reset is used, because the utility model includes an expansion unit and a gripping unit for clamping the expansion unit,
[0021] The expansion unit comprises an expansion main body and a pressurizing rotating shaft, the two ends of the expansion main body are respectively provided with screw holes with opposite screw directions, the pressurizing rotating shaft is arranged in the inside of the expansion main body, and the two ends of the pressurizing rotating shaft are respectively threadedly connected with the corresponding screw holes of the expansion main body,
[0022] The expansion main body has an upper support sheet and a lower support sheet which are expanded to the outside and are in an expansion state,
[0023] The gripping unit comprises a gripper and a locking sleeve, the head of the gripper holds the tail of the expansion main body, the locking sleeve is sleeved on the outer periphery of the gripper, the locking sleeve is rotated to make the gripper and the expansion main body locked,
[0024] The pressurizing rotating shaft is rotated, the two ends of the expansion main body are simultaneously extruded to the middle to make the upper support sheet and the lower support sheet of the expansion main body simultaneously expanded to the outside, so as to support and reset the collapsed vertebral body,
[0025] The operation specific steps of the utility model are as follows: a support reset channel of the vertebral body is established in advance,
[0026] The gripper head of the gripping unit grips the tail of the expansion main body, and the locking sleeve is rotated to lock the gripper and the expansion main body, the expansion main body is gripped into the channel and located below the collapsed vertebral body, at this time, the pressure rotating shaft is rotated, the two ends of the expansion main body are simultaneously extruded to the middle, that is, the two ends of the expansion main body are simultaneously horizontally moved in opposite directions (opposite directions), so that the upper support piece and the lower support piece of the expansion main body are simultaneously expanded to the outside, so as to support the collapsed vertebral body and complete the vertebral body reduction,
[0027] After the vertebral body is reduced, the pressure rotating shaft is reversely rotated, the upper support piece and the lower support piece of the expansion main body are retracted to the initial state, and the expansion main body is withdrawn from the channel,
[0028] The fixation after the vertebral body is reduced by injecting bone cement into the channel,
[0029] The utility model discloses a kind of mechanical rigid connection products for collapsed vertebral body is reduced in minimally invasive way, not only simple structure, easy operation, and expansion force value is larger, expansion height can also meet the requirement of operation, simultaneously, the structure after expansion is stable, reliable, and after expansion, it is convenient to retract and exit, meet the demand of clinical operation, and also improve the soft balloon expansion force in existing scheme, excessive compression pressure can also cause product rupture, the risk of patient injury infection. At the same time, using this minimally invasive way to reduce, also overcome the defects, such as, in the prior art, open reduction surgery trauma surface is larger, patient recovery time is long, so its risk of infection is relatively higher. DRAWINGS
[0030] Figure 1 It is the structure schematic view of a specific embodiment of the utility model;
[0031] Figure 2 It is the state schematic view when locking sleeve of the utility model is loosened;
[0032] Figure 3 It is the state schematic view when locking sleeve of the utility model is locked (neck retraction);
[0033] Figure 4 It is the structure schematic view of expansion unit of the utility model;
[0034] Figure 5 It is the structure schematic view after expansion of expansion unit of the utility model;
[0035] Figure 6 It is the three-dimensional structure schematic view of expansion unit of the utility model;
[0036] Figure 7 It is Figure 6 Another direction schematic view of DETAILED DESCRIPTION
[0037] The utility model is further explained in connection with the drawings and the embodiments given below, but is not limited thereto.
[0038] As Figure 1 , 2 , 3, 4, 5, 6, 7, a kind of distraction instrument for vertebral body collapse reset, including distraction unit, and the gripping unit for clamping distraction unit,
[0039] The distraction unit includes distraction main body 1 and pressurized rotating shaft 2, the both ends of the distraction main body 1 are respectively provided with screw hole with opposite screw direction, the pressurized rotating shaft 2 is arranged in the inside of distraction main body 1, and the both ends of pressurized rotating shaft 2 are respectively threadedly connected with the corresponding screw hole of distraction main body 1,
[0040] The distraction main body 1 has upper support sheet 11 and lower support sheet 12 which expand to the outside and present distraction state,
[0041] The gripping unit includes gripper 3 and locking sleeve 4, the head of the gripper 3 grips the tail of distraction main body 1, the locking sleeve 4 is sleeved on the outer periphery of gripper 3, and rotating locking sleeve 4 makes gripper 3 and distraction main body 1 form locking,
[0042] Rotating the pressurized rotating shaft 2, the both ends of the distraction main body 1 are extruded to the middle simultaneously, so that the upper support sheet 11 and the lower support sheet 12 of distraction main body 1 expand to the outside simultaneously, to support the collapsed vertebral body and reset it.
[0043] Further, as Figure 6 , 7 The distraction main body 1 is in the form of cuboid structure as a whole, and is hollow inside, and the screw holes at the both ends of distraction main body 1 are different in size (different in diameter), and the pitch is consistent, i.e. the head-end screw hole is smaller than the tail-end screw hole. This design has the advantage that, since the distraction main body is in the form of cuboid structure, it is convenient to enter the collapsed vertebral body part through a minimally invasive channel, and the screw hole is smaller in front and larger at the back, facilitating assembly with the pressurized rotating shaft.
[0044] Further, as Figure 4 , 5 , 6, 7, in order to make the structure more reasonable, form stable connection with the pressurized rotating shaft, and enable the support sheet to achieve distraction purpose by rotating the pressurized rotating shaft, the distraction main body 1 further includes head 13 and tail 14 which are integrated with the upper support sheet 11 and the lower support sheet 12, the head 13 and the tail 14 are respectively provided with screw holes which form threaded connection with the pressurized rotating shaft 2, and in order to facilitate insertion of a screwdriver and control rotation of the pressurized rotating shaft, the tail of the pressurized rotating shaft 2 is provided with a hexagonal inner hole which facilitates insertion of a screwdriver to form cooperative connection.
[0045] Further, asFigure 6 、 7 As shown in the figure, in order to reduce the local structural strength of the support sheet, so as to realize the structural shape of the support sheet when it is expanded, four elastic grooves 15 for reducing the local structural strength are arranged on both sides of the upper support sheet 11 and the lower support sheet 12 along the length direction, the pressure rotating shaft 2 is rotated, the upper support sheet 11 and the lower support sheet 12 are expanded outward through the guide mechanism arranged in the expansion main body 1 and are bent into three equilateral support sheets. The structural shape of the support sheet after being supported is similar to a trapezoidal shape, the stability and smoothness of the support sheet after being expanded are ensured, collapse is not easy to occur, and the expansion structure is more reliable.
[0046] Further, as shown in the figure, Figure 6 、 7 In order to ensure the shape of the support sheet after being supported, the collapsed vertebral body can be effectively reset, the guide mechanism comprises an upper guide column 51 and a lower guide column 52, a plurality of guide ring grooves are arranged on the outer peripheral wall of the pressure rotating shaft 2, two upper guide columns 51 are arranged on the upper support sheet 11, two lower guide columns 52 are arranged on the lower support sheet 12, and the upper guide column 51 and the lower guide column 52 are respectively slidably matched in the corresponding guide ring grooves, the pressure rotating shaft 2 is rotated, the upper guide column 51 and the lower guide column 52 slide reversely (oppositely) along the guide ring grooves under the guide action, the upper support sheet 11 and the lower support sheet 12 are expanded outward and are bent into three equilateral support sheets, one of which is in a horizontal state, and the remaining two support sheets are located at both ends of the horizontal support sheet and form an included angle.
[0047] Further, as shown in the figure, Figure 5 In order to make the support sheet more stable and outwardly support, and avoid local support not being in place, the upper support sheet 11 and the lower support sheet 12 are simultaneously expanded outward through the guide plane formed by the four guide columns, two upper guide columns 51 and two lower guide columns 51 are diagonally arranged and are parallelly arranged. The purpose of such arrangement is to ensure that the upper and lower support sheets are always in a horizontal state during the expansion process, avoid uneven force from causing the horizontal state to be not horizontal, and the horizontal support sheet can increase the contact area with the collapsed vertebral body, prevent the vertebral body from being collapsed due to excessive local pressure and the expansion effect being poor.
[0048] Further, as shown in the figure, Figure 4 、 5 , 6, 7, in order to prevent the expansion main body from moving or slipping at the expansion position, the outer sides of the upper support sheet 11 and the lower support sheet 12 are each provided with a plurality of anti-skid grooves 6 for preventing displacement or slipping.
[0049] Further, in order to further improve the structural rationality, the anti-skid groove 6 is a V-shaped groove, the included angle of the V-shaped groove is 40°-90°, and the groove spacing is 0.5mm-5mm.
[0050] Further, as shown in Figure 4 、 5 , in order to make the structure more reasonable, the two ends of the upper support sheet 11 and the lower support sheet 12 and close to the head 13 and the tail 14 are respectively provided with an elastic groove 7 for reducing the structural strength of the joint part and increasing the flexibility of the bending part of the support sheet, the groove 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 such design is to retreat the head 13 part of the support body 1 and advance the tail 14 part when the pressurized rotating shaft rotates, and the elastic groove 7 and the elastic groove 15 will be elastically bent under the action of two thrust forces, so as to achieve the effect of supporting the support sheet to be opened.
[0051] Further, as shown in Figure 2 、 3 , 6, 7, in order to facilitate the gripper to grip the support body, the tail of the support body 1 is provided with a clamping groove 16, the clamping groove 16 has a positioning hole, the head of the gripper 3 is machined with a pair of symmetrically arranged notches, and there is a circular hole in the notch, the depth of the circular hole is lower than the notch plane, which is convenient for clamping and dismounting the instrument. Thus a pair of V-shaped elastic clamping sheets 31 are constructed, and the inner side wall of the elastic clamping sheet 31 is provided with a positioning protrusion 34. When the locking sleeve 4 is not restrained, the elastic clamping sheet 31 is opened to both sides, the locking sleeve 4 is rotated and the elastic clamping sheet 31 of the gripper 3 is restrained to close and shrink, and at the same time the positioning protrusion 34 on the elastic clamping sheet 31 is tightly matched with the positioning hole, so that the gripper 3 and the support body 1 are locked.
[0052] Further, as shown in Figure 2 、 3 , in order to facilitate the operation of the gripper, the gripper 3 includes a hollow tube 32, the tail of the hollow tube 32 is provided with a handle 33, and the inside of the hollow tube 32 is a screw channel. The screw enters the hollow tube of the gripper 3 and inserts into the internal hexagonal hole of the pressurized rotating shaft 2 to rotate it.
[0053] Further, as shown in Figure 2 、 3 , 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 connected with the thread, the locking sleeve 4 is rotated to move towards the head of the hollow tube 32, and the tapered tube of the head of the locking sleeve 4 can constrain a pair of elastic clamping sheets to close and lock the tail of the support body.
[0054] The specific operating steps of this utility model are as follows:
[0055] Pre-establish a support and repositioning channel for the vertebral body.
[0056] The elastic clamping piece 31 of the gripper 3 grips the clamping groove 16 at the tail of the main body 1 (e.g., Figure 2 As shown), the locking sleeve 4 is rotated, causing it to move towards the head of the hollow tube 32. The tapered tube at the head of the locking sleeve 4 can constrain a pair of elastic clamping pieces 31 to come together and lock them at the tail of the expanding body 1. At the same time, the positioning protrusion 34 on the elastic clamping piece 31 is tightly engaged with the positioning hole, so that the gripper 3 and the expanding body 1 form a lock (as shown). Figure 3 As shown), the gripper 3 is used to send the supporting body 1 into the channel and place it below the collapsed cone. At this time, the rotating shaft 2 is rotated and the two ends of the supporting body 1 are simultaneously squeezed towards the middle, that is, the two ends of the supporting body move horizontally in opposite directions (relatively) at the same time, so that the upper support plate 11 and the lower support plate 12 of the supporting body 1 expand outward at the same time. Under the guidance of the upper guide post 51 and the lower guide post 52, they slide back and forth along the guide ring groove. During the expansion process, the middle part of the upper and lower support plates is always in a horizontal state to avoid unevenness due to uneven force. Finally, the upper support plate 11 and the lower support plate 12 expand outward and bend towards the middle to form three equilateral support plates (as shown). Figure 5 (As shown), it is used to support the collapsed vertebral body and complete the vertebral repositioning.
[0057] After the vertebral body is repositioned, the pressure-applying rotating shaft 2 is rotated in the opposite direction, and the upper support plate 11 and lower support plate 12 of the expanding body 1 retract to return to their initial state (e.g., Figure 4 (As shown), and exit the channel.
[0058] The vertebral body is fixed after repositioning by injecting bone cement into the channel.
[0059] Of course, the expansion unit of this utility model can also be used as a vertebral body replacement component and implanted into the body. The expansion body is placed at the vertebral body that needs to be replaced. The overall height of the upper and lower support plates after expansion is adjusted according to the surgical requirements. The upper and lower support plates abut against the adjacent vertebral bodies respectively and are not prone to displacement.
[0060] This invention relates to a mechanical rigid connection product for minimally invasive reduction of collapsed vertebrae. It is not only simple in structure and easy to operate, but also possesses a large opening force and opening height that meets surgical requirements. Furthermore, the structure is stable and reliable after opening, and it is easy to retract and remove after opening, thus meeting clinical surgical needs. Simultaneously, this minimally invasive reduction method overcomes the drawbacks of existing open reduction surgeries, such as larger wound areas, longer postoperative recovery times, and a relatively higher risk of infection.
[0061] The above is the ideal embodiment of the present application, and the above description can be varied and modified without departing from the technical concept of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined by the scope of the claims.
Claims
1. A distraction device for use in the reduction of a collapsed vertebral body, comprising: The utility model relates to a kind of expanders and gripping units for holding expanders, The expander includes expander body (1) and pressurized rotating shaft (2), the two ends of expander body (1) are respectively provided with screw hole with opposite screw direction, pressurized rotating shaft (2) is arranged in the inside of expander body (1), and the two ends of pressurized rotating shaft (2) are respectively connected with the screw hole of expander body (1) with thread, The expander body (1) has upper support sheet (11) and lower support sheet (12) which expand to outside and are in expanded state, The gripping unit includes gripper (3) and locking sleeve (4), the head of gripper (3) holds the tail of expander body (1), locking sleeve (4) is sleeved on the outer periphery of gripper (3), and rotating locking sleeve (4) makes gripper (3) and expander body (1) form locking, Rotating pressurized rotating shaft (2), the two ends of expander body (1) are extruded to middle simultaneously, so that upper support sheet (11) and lower support sheet (12) of expander body (1) expand to outside simultaneously, to support collapsed vertebral body and reset it.
2. A distraction device for vertebral body collapse reduction according to claim 1, wherein: The expander body (1) further includes head (13) and tail (14) which are integrated with upper support sheet (11) and lower support sheet (12) simultaneously, the head (13) and tail (14) are respectively provided with screw hole which is connected with pressurized rotating shaft (2) with thread, and the tail of pressurized rotating shaft (2) is provided with hexagonal inner hole which is convenient for inserting lever to form matched connection.
3. The distractor instrument for vertebral body collapse reduction of claim 1, wherein: The two sides of upper support sheet (11) and lower support sheet (12) and along its length direction are respectively provided with four elastic grooves (15) for reducing local structural strength, rotating pressurized rotating shaft (2), so that upper support sheet (11) and lower support sheet (12) expand to outside and bend into three equilateral support sheets through guide mechanism arranged in the inside of expander body (1), one of which is horizontal, and the remaining two are located at both ends of the horizontal support sheet and form an angle.
4. A distraction device for vertebral body collapse reduction according to claim 3, wherein: The guide mechanism includes upper guide column (51) and lower guide column (52), the outer peripheral wall of pressurized rotating shaft (2) is provided with multiple sets of guide ring grooves, the upper support sheet (11) is provided with two upper guide columns (51), the lower support sheet (12) is provided with two lower guide columns (52), and the upper guide column (51) and the lower guide column (52) are respectively slidably matched in the corresponding guide ring groove, rotating pressurized rotating shaft (2), under the guidance of upper guide column (51) and lower guide column (52) and along the reverse sliding of guide ring groove, so that upper support sheet (11) and lower support sheet (12) expand to outside and are bent to three equilateral support sheets.
5. A distraction device for vertebral body collapse reduction according to claim 4, wherein: The upper support sheet (11) and the lower support sheet (12) are expanded to outside through the guide plane formed by four guide columns, and two upper guide columns (51) and two lower guide columns (52) are diagonally arranged.
6. The distractor instrument for vertebral body collapse reduction of claim 1, wherein: The outer side of upper support sheet (11) and lower support sheet (12) is respectively provided with a plurality of anti-skid grooves (6) for preventing displacement or slipping.
7. A distraction device for vertebral body collapse reduction as defined in claim 6 wherein: The anti-skid groove (6) is a V-shaped groove, the included angle of the V-shaped groove is 40°-90°, and the groove spacing is 0.5mm-5mm.
8. The distractor instrument for vertebral body collapse reduction of claim 2, wherein: The two ends of the upper support sheet (11) and the lower support sheet (12) and close to the head (13) and the tail (14) are respectively provided with elastic grooves (7) for reducing the structural strength of the joint part and increasing the flexibility of the bending part of the support sheet, the groove direction of the elastic groove (7) is opposite to the recess direction of the elastic groove (15) on the upper support sheet (11) and the lower support sheet (12).
9. The distractor instrument for vertebral body collapse reduction of claim 1, wherein: The tail of the expansion main body (1) is provided with clamping grooves (16), the clamping grooves (16) have positioning holes, the head of the gripper (3) has a pair of V-shaped elastic clamping sheets (31), and the inner side wall of the elastic clamping sheet (31) is provided with a positioning protrusion (34), the locking sleeve (4) is rotated and the elastic clamping sheet (31) of the gripper (3) is constrained to close and shrink, and the positioning protrusion (34) on the elastic clamping sheet (31) is tightly matched with the positioning hole, so that the gripper (3) and the expansion main body (1) are locked.
10. The distractor instrument for vertebral body collapse reduction of claim 1, wherein: The gripper (3) comprises a hollow pipe (32), the tail of the hollow pipe (32) is provided with a handle (33), and the inside of the hollow pipe (32) is a screw channel, the head of the locking sleeve (4) is a tapered pipe, and the locking sleeve (4) is sleeved on the outer periphery of the hollow pipe (32) and is threadedly connected with the same.