Distraction forceps for spinal posterior internal fixation

Abstract

The utility model discloses a pair of distraction forceps for fixing in a posterior spine. The pair of distraction forceps comprises a first forceps body, a second forceps body, an elastic component and a fixing component, the first clamp body and the second clamp body are rotationally connected in the middle, and a containing space is formed between the tail of the first clamp body and the tail of the second clamp body. The elastic assembly and the fixing assembly are arranged in the containing space, and the elastic assembly is used for driving the tails of the first clamp body and the second clamp body to be away from each other. The elastic assembly and the fixing assembly are both arranged in the containing space, compared with existing distraction forceps, the phenomenon that parts are arranged on the forceps body in a protruding mode can be avoided, so that occupation of the surgical operation space is reduced, the surgical field is provided, meanwhile, the surgical operation difficulty is not increased, and the phenomena that surgical gown and gloves are hooked and connected are avoided; the injury to a patient caused by mistaken touch during surgical operation is avoided, and the surgical safety and the surgical efficiency are improved.

Description

Technical Field

[0001] The utility model relates to medical equipment, in particular to a pair of distraction forceps for posterior spinal internal fixation. Background Art

[0002] Posterior spinal fixation is a surgical procedure used to treat spinal diseases or injuries, such as herniated disc, scoliosis, spinal cord injury, etc. During the operation, a distraction forceps is needed to expose the surgical field, and the vertebral body is distracted by the cooperation of the universal pedicle screw and the connecting rod. After distraction, the pre-locking screw is tightened to fix the universal pedicle screw and the connecting rod, and then the cross connection is installed to achieve vertebral fixation.

[0003] Most of the existing spreader forceps use a rack at the end of the handle to fix the two handles. The rack itself extends beyond the main body of the spreader forceps, which not only affects the surgical operation, limits the surgical operation space, and increases the difficulty of the operation, but may also cause accidental touch or even harm to the patient.

[0004] Based on the above, there is an urgent need for a distraction forceps for posterior spinal internal fixation that can solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a distraction forceps for posterior spinal internal fixation, which will not affect the surgical operation space and surgical difficulty and reduce the possibility of injury caused by accidental touch.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Spinal posterior internal fixation distraction forceps, including:

[0008] A first clamp body and a second clamp body, wherein the first clamp body and the second clamp body are rotatably connected at the middle, the heads of the first clamp body and the second clamp body are configured to open the spine, and an accommodation space is formed between the tails of the first clamp body and the second clamp body;

[0009] An elastic component, the elastic component is arranged in the accommodating space, and the elastic component is used to drive the tails of the first caliper body and the tails of the second caliper body to move away from each other;

[0010] A fixing component, the fixing component is arranged in the above-mentioned accommodating space, and the fixing component is used to fix the above-mentioned first pliers body and the above-mentioned second pliers body at a first preset angle and a second preset angle, the above-mentioned first preset angle is configured so that the heads of the above-mentioned first pliers body and the above-mentioned second pliers body abut against each other, and the above-mentioned second preset angle is greater than the above-mentioned first preset angle.

[0011] Optionally, the elastic component includes a first spring sheet and a second spring sheet, the tail of the first spring sheet is fixedly connected to the first caliper body, the tail of the second spring sheet is fixedly connected to the second caliper body, the head of the first spring sheet and the head of the second spring sheet are transmission-connected, and the first spring sheet and the second spring sheet are configured to be in a deformed state when the first caliper body and the second caliper body are in the second preset angle.

[0012] Optionally, a buckle portion is provided at the head of the first spring piece, and the cross-sectional size of the buckle portion gradually increases in the direction away from the tail of the first spring piece; a slot portion is provided at the head of the second spring piece, and the internal size of the slot portion gradually decreases in the direction away from the tail of the second spring piece; the buckle portion is inserted in the slot portion to limit the insertion and cooperation of the first spring piece and the second spring piece.

[0013] Optionally, the fixing assembly comprises a rack condition, a rack sleeve and a paddle, one end of the rack sleeve is rotatably connected to the first caliper body, one end of the rack condition is rotatably connected to the second caliper body, the other end of the rack sleeve is provided with a socket, and the other end of the rack condition extends into the socket; the paddle is movably provided on the outer surface of the rack sleeve, and the paddle is configured to have an abutting state with the rack condition and a separating state with the rack condition;

[0014] In the above-mentioned abutting state, the above-mentioned paddle can be embedded in the rack of the above-mentioned gear condition, so that the above-mentioned first pliers body and the above-mentioned second pliers body are fixed at the above-mentioned first preset angle or the above-mentioned second preset angle;

[0015] In the above-mentioned separation state, the above-mentioned rack member can extend into and withdraw from the above-mentioned rack sleeve, so that the above-mentioned first caliper body and the above-mentioned second caliper body can change between the above-mentioned first preset angle and the above-mentioned second preset angle.

[0016] Optionally, a connecting seat is provided at the tail of the first caliper body, one end of the connecting seat is fixedly connected to the first caliper body, the other end of the connecting seat is arranged toward the accommodating space, and one end of the rack sleeve is rotatably connected to the other end of the connecting seat.

[0017] Optionally, the fixing assembly further comprises a fixing pin, the other end of the connecting seat is provided with a connecting groove, the side wall of the connecting groove is provided with a pin hole, one end of the rack sleeve is provided with a connecting protrusion, the connecting protrusion is provided with a rotating hole, and the connecting protrusion is limitedly inserted in the connecting groove;

[0018] The fixing pin is fixedly inserted into the pin hole, and the connecting protrusion is rotatably sleeved on the fixing pin.

[0019] Optionally, the above-mentioned fixing assembly also includes a paddle seat, a paddle shaft and a torsion spring, the above-mentioned paddle seat is fixedly arranged on the outer surface of the above-mentioned rack sleeve, the above-mentioned paddle shaft is installed on the above-mentioned paddle seat and is arranged perpendicular to the axial direction of the above-mentioned rack sleeve, the above-mentioned paddle is rotatably installed on the above-mentioned paddle shaft, the above-mentioned torsion spring is sleeved on the above-mentioned paddle shaft, and the above-mentioned torsion spring is used to drive the above-mentioned paddle to remain in the above-mentioned abutment state.

[0020] Optionally, the head of the paddle is provided with an abutment portion bent toward the gear condition, the middle of the paddle is provided with an axial hole for the paddle shaft to pass through, the tail of the paddle is provided with an anti-slip groove, and the anti-slip groove is located on the side of the paddle away from the rack sleeve.

[0021] Optionally, along the direction of extending into the rack sleeve, the outer surface of the rack condition is provided with scale lines, and the scale lines are used to mark or calculate the distance between the heads of the first pliers body and the second pliers body.

[0022] Optionally, the rack sleeve is provided with an abutment hole, the abutment hole is connected to the socket, and the abutment portion can pass through the abutment hole and abut against the rack condition.

[0023] The beneficial effect of the distraction forceps for posterior spinal internal fixation provided by the utility model is that: by arranging both the elastic component and the fixing component in the accommodating space, compared with the existing distraction forceps, it is possible to avoid the phenomenon of parts protruding from the forceps body, thereby reducing the encroachment on the surgical operation space, and while providing a surgical field of view, it will not increase the difficulty of the surgical operation, and will not cause the phenomenon of hooking surgical clothes, gloves, etc., thus avoiding injuries to patients caused by accidental touch during the surgical operation, thereby improving the safety and efficiency of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of the structure of the distraction forceps for posterior spinal internal fixation in the utility model;

[0025] Figure 2 It is a three-dimensional structural diagram of the first clamp body in the utility model;

[0026] Figure 3 It is a three-dimensional structural diagram of the rotating screw in the utility model;

[0027] Figure 4 It is a three-dimensional structural diagram of the second clamp body in the utility model;

[0028] Figure 5 It is a three-dimensional structural diagram of the first spring piece in the utility model;

[0029] Figure 6 It is a three-dimensional structural diagram of the second spring piece in the utility model;

[0030] Figure 7 It is a three-dimensional structural diagram of the tooth condition in the utility model;

[0031] Figure 8 It is a three-dimensional structural diagram of the rack sleeve in the utility model;

[0032] Fig. 9 It is a three-dimensional structural diagram of the plectrum in the utility model;

[0033] Fig.10 It is a three-dimensional structural diagram of the connecting seat in the utility model;

[0034] Fig.11 It is a three-dimensional structural diagram of the paddle seat in the utility model;

[0035] Fig.12 It is a three-dimensional structural diagram of the torsion spring in the utility model;

[0036] Fig.13 It is a three-dimensional structural diagram of the paddle shaft in the utility model.

[0037] In the figure:

[0038] 1. The first clamp body;

[0039] 2. The second clamp body;

[0040] 3. first spring piece; 31. buckle portion;

[0041] 4. second spring piece; 41. slot portion;

[0042] 5. Tooth conditions;

[0043] 6. rack sleeve; 61. connecting protrusion; 62. socket; 63. abutment hole;

[0044] 7. paddle; 71. abutment portion; 72. anti-slip groove;

[0045] 8. Connecting seat; 81. Connecting slot;

[0046] 9. Pick seat;

[0047] 10. Torsion spring;

[0048] 11. Pick shaft;

[0049] 12. Turn the screw; 13. Fix the pin; 14. Tighten the screw. DETAILED DESCRIPTION

[0050] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0053] Refer to the following Figures 1 to 13 The utility model introduces a distraction forceps for posterior spinal internal fixation.

[0054] like Figure 1As shown, in this embodiment, the distraction forceps for posterior spinal internal fixation include a first forceps body 1, a second forceps body 2, an elastic component and a fixing component. The first forceps body 1 and the second forceps body 2 are rotatably connected in the middle, and the heads of the first forceps body 1 and the second forceps body 2 can abut against each other to extend into the gap of the spine, and can move away from each other to distract the spine. An accommodating space is formed between the tails of the first forceps body 1 and the second forceps body 2, and the elastic component and the fixing component are both arranged in the accommodating space. The elastic component is used to drive the tails of the first forceps body 1 and the second forceps body 2 to move away from each other, that is, to make the heads of the first forceps body 1 and the second forceps body 2 have a tendency to abut against each other, so as to facilitate the movement and use of the distraction forceps for posterior spinal internal fixation. The fixing assembly is used to fix the first clamp body 1 and the second clamp body 2 at a first preset angle and a second preset angle, and when the first clamp body 1 and the second clamp body 2 are at the first preset angle, the heads of the first clamp body 1 and the second clamp body 2 abut against each other to facilitate insertion into the gap, and when the first clamp body 1 and the second clamp body 2 are at the second preset angle, there is a preset distance between the heads of the first clamp body 1 and the second clamp body 2 to increase the spinal gap and meet different surgical needs.

[0055] By arranging both the elastic component and the fixed component in the accommodating space, compared with the existing spreading forceps, the phenomenon of parts protruding from the forceps body can be avoided, thereby reducing the encroachment on the surgical operation space. While providing a surgical field of view, the difficulty of the surgical operation will not be increased, and there will be no phenomenon of hooking of surgical gowns, gloves, etc., thus avoiding harm to the patient caused by accidental touch during the surgical operation, thereby improving the safety and efficiency of the operation.

[0056] Specifically, Figures 2 to 4 As shown, in this embodiment, the first clamp body 1 and the second clamp body 2 are connected in rotation by rotating the screw 12. Preferably, the first clamp body 1 is provided with a bite protrusion, and the second clamp body 2 is provided with a bite groove, and the bite protrusion can be inserted in the bite groove in a limited position. The rotating screw 12 is fixedly penetrated through the side wall of the bite groove, and is rotated to penetrate the bite protrusion, so that the first clamp body 1 and the second clamp body 2 are connected in rotation in a limited position, avoiding the first clamp body 1 and the second clamp body 2 from shaking in the direction of rotation, etc., and improving the structural stability when the spine is stretched.

[0057] like Figure 5 , Figure 6As shown, in this embodiment, the elastic component includes a first spring piece 3 and a second spring piece 4, the tail of the first spring piece 3 is connected to the first caliper body 1 by fastening screws 14 and gluing, the tail of the second spring piece 4 is connected to the second caliper body 2 by fastening screws 14 and gluing, and the head of the first spring piece 3 and the head of the second spring piece 4 are transmission-connected. When the first caliper body 1 and the second caliper body 2 are at the second preset angle, the first spring piece 3 and the second spring piece 4 are in a deformed state to generate an elastic force that causes the heads of the first caliper body 1 and the second caliper body 2 to move toward abutment. Preferably, in some embodiments, when the first caliper body 1 and the second caliper body 2 are at the first preset angle, the first spring piece 3 and the second spring piece 4 are also in a deformed state, so that the heads of the first caliper body 1 and the second caliper body 2 can remain in an abutment state, which is convenient for movement and taking.

[0058] Further, refer to Figure 1 , Figure 5 and Figure 6 As shown, the head of the first spring piece 3 is provided with a buckle portion 31, and the cross-sectional size of the buckle portion 31 gradually increases in the direction away from the tail of the first spring piece 3, and the head of the second spring piece 4 is provided with a slot portion 41, and the internal size of the slot portion 41 gradually decreases in the direction away from the tail of the second spring piece 4. The buckle portion 31 is inserted into the slot portion 41 to limit the insertion and matching of the first spring piece 3 and the second spring piece 4, which can avoid the separation of the first spring piece 3 and the second spring piece 4, resulting in the phenomenon that the tail of the first clamp body 1 and the second clamp body 2 cannot be normally opened, thereby facilitating the operation of reducing the opening degree during surgery.

[0059] like Figures 7 to 9 As shown, the fixing assembly includes a rack 5, a rack sleeve 6 and a paddle 7. One end of the rack sleeve 6 is rotatably connected to the first caliper body 1, and one end of the rack 5 is rotatably connected to the second caliper body 2. The other end of the rack sleeve 6 is provided with a socket 62, and the other end of the rack 5 is inserted into the socket 62, and the insertion depth can be selectively changed. The paddle 7 is movably arranged on the outer surface of the rack sleeve 6, and the paddle 7 has an abutting state with the rack 5 and a separation state with the rack 5. The surface of the rack 5 is provided with a rack, and in the abutting state, the paddle 7 can be embedded between two adjacent teeth of the rack 5, so that the first caliper body 1 and the second caliper body 2 are fixed at the above-mentioned first preset angle or the second preset angle. In the separation state, the paddle 7 is separated from the rack 5, and the rack 5 can be inserted into and withdrawn from the rack sleeve 6, so that the first caliper body 1 and the second caliper body 2 change between the first preset angle and the second preset angle.

[0060] Of course, according to actual needs, the position where the paddle 7 abuts against the tooth condition 5 can also be adjusted so that the first pliers body 1 and the second pliers body 2 are maintained at other angles such as the third preset angle to meet different surgical needs. Therefore, the utility model does not specifically limit the range of angles that can be achieved between the first pliers body 1 and the second pliers body 2, as long as the heads of the first pliers body 1 and the second pliers body 2 can abut and separate from each other.

[0061] Preferably, if Figure 7 As shown, along the direction of extending into the rack sleeve 6, the outer surface of the rack condition 5 is provided with scale lines, which are used to mark or calculate the distance between the heads of the first clamp body 1 and the second clamp body 2. The scale lines can facilitate quantitative expansion of the spine during surgery, improve the accuracy and safety of the surgery, and also facilitate postoperative recovery.

[0062] Alternatively, if Figure 8 As shown, the rack sleeve 6 is provided with an abutment hole 63, which is connected to the socket 62, and a portion of the paddle 7 can pass through the abutment hole 63 and abut against the rack member 5. After the abutment hole 63 is provided, the depth of the rack member 5 extending into the rack sleeve 6 can be no less than the distance from the abutment hole 63 to the socket 62, thereby avoiding the phenomenon of separation of the rack member 5 and the rack sleeve 6, avoiding loosening and failure of the distraction forceps during surgery, and ensuring the normal and safe operation.

[0063] Preferably, if Figure 1 , Figure 8 and Fig.10 As shown, a connection seat 8 is provided at the tail of the first caliper body 1, one end of the connection seat 8 is fixedly connected to the first caliper body 1, the other end of the connection seat 8 is arranged facing the accommodation space, and one end of the rack sleeve 6 is rotatably connected to the other end of the connection seat 8. The connection seat 8 can increase the rotation range of the rack sleeve 6 to avoid jamming.

[0064] Further preferably, the fixing assembly further comprises a fixing pin 13, a connecting groove 81 is provided at the other end of the connecting seat 8, a pin hole is provided on the side wall of the connecting groove 81, a connecting protrusion 61 is provided at one end of the rack sleeve 6, a rotating hole is provided on the connecting protrusion 61, and the connecting protrusion 61 is limitedly inserted in the connecting groove 81. The fixing pin 13 is fixedly inserted in the pin hole and welded to the first caliper body 1, and the connecting protrusion 61 is rotatably sleeved on the fixing pin 13. The rack sleeve 6 is limited by the connecting protrusion 61 and the connecting groove 81, so that the rack sleeve 6 can only be Figure 1 The rotation is performed in the vertical plane shown to further avoid jamming.

[0065] More specifically, if Fig. 9 , Figures 11 to 13As shown, the fixing assembly also includes a paddle seat 9, a paddle shaft 11 and a torsion spring 10. The paddle seat 9 is fixedly sleeved on the rack sleeve 6, and the paddle shaft 11 is welded and installed on the paddle seat 9 and is arranged perpendicular to the axial direction of the rack sleeve 6. The paddle 7 is rotatably installed on the paddle shaft 11, and its head can abut against or separate from the rack condition 5 during the rotation process. The torsion spring 10 is sleeved on the paddle shaft 11, and the torsion spring 10 is used to drive the paddle 7 to rotate and maintain it in an abutting state. By providing the torsion spring 10, it is possible to avoid the paddle 7 from separating from the rack condition 5 during the operation, and to make the rack condition 5 and the rack sleeve 6 slide, thereby preventing the distraction forceps from loosening and failing during the operation, and ensuring the normal and safe operation.

[0066] Preferably, if Fig. 9 As shown, the head of the paddle 7 is provided with an abutment portion 71 bent toward the rack condition 5, and the abutment portion 71 can pass through the abutment hole 63 and abut against the rack condition 5. The middle part of the paddle 7 is provided with an axial hole for the paddle shaft 11 to pass through, and the tail of the paddle 7 is provided with an anti-skid groove 72, and the anti-skid groove 72 is located on the side of the paddle 7 away from the rack sleeve 6. In this way, when the tail of the paddle 7 is pressed during the operation, the abutment portion 71 of the paddle 7 can be quickly separated from the rack condition 5. When the pressure on the tail of the paddle 7 stops, under the action of the torsion spring 10, the paddle 7 rotates quickly, and the abutment portion 71 quickly abuts against the rack condition 5. This operation is fast, convenient and simple, which can greatly reduce the difficulty of the operation and improve the safety and efficiency of the operation.

[0067] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A distraction forceps for posterior spinal internal fixation, characterized in that: include: A first clamp body (1) and a second clamp body (2), wherein the first clamp body (1) and the second clamp body (2) are rotatably connected at the middle, the heads of the first clamp body (1) and the second clamp body (2) are configured to open the spine, and an accommodating space is formed between the tails of the first clamp body (1) and the second clamp body (2); An elastic component, the elastic component is arranged in the accommodating space, and the elastic component is used to drive the tails of the first pliers body (1) and the tails of the second pliers body (2) to move away from each other; A fixing component, the fixing component is arranged in the accommodating space, and the fixing component is used to fix the first pliers body (1) and the second pliers body (2) at a first preset angle and a second preset angle, the first preset angle is configured so that the heads of the first pliers body (1) and the second pliers body (2) are in contact with each other, and the second preset angle is greater than the first preset angle.

2. The distraction forceps for posterior spinal internal fixation according to claim 1, characterized in that: The elastic component comprises a first spring sheet (3) and a second spring sheet (4), the tail of the first spring sheet (3) is fixedly connected to the first pliers body (1), the tail of the second spring sheet (4) is fixedly connected to the second pliers body (2), the head of the first spring sheet (3) and the head of the second spring sheet (4) are transmission-connected, and the first spring sheet (3) and the second spring sheet (4) are configured to be in a deformed state when the first pliers body (1) and the second pliers body (2) are at the second preset angle.

3. The distraction forceps for posterior spinal internal fixation according to claim 2, characterized in that: The head of the first spring piece (3) is provided with a buckle portion (31), and the cross-sectional size of the buckle portion (31) gradually increases in a direction away from the tail of the first spring piece (3); the head of the second spring piece (4) is provided with a slot portion (41), and the internal size of the slot portion (41) gradually decreases in a direction away from the tail of the second spring piece (4); the buckle portion (31) is inserted into the slot portion (41) to limit the insertion and matching of the first spring piece (3) and the second spring piece (4).

4. The distraction forceps for posterior spinal internal fixation according to claim 1, characterized in that: The fixing assembly comprises a rack member (5), a rack sleeve (6) and a paddle (7); one end of the rack sleeve (6) is rotatably connected to the first caliper body (1); one end of the rack member (5) is rotatably connected to the second caliper body (2); the other end of the rack sleeve (6) is provided with a socket (62); the other end of the rack member (5) extends into the socket (62); the paddle (7) is movably arranged on the outer surface of the rack sleeve (6), and the paddle (7) is configured to have an abutting state with the rack member (5) and a separated state with the rack member (5); In the abutting state, the paddle (7) can be embedded in the rack of the toothed frame (5), so that the first pliers body (1) and the second pliers body (2) are fixed at the first preset angle or the second preset angle; In the separated state, the toothed member (5) can extend into and out of the rack sleeve (6) so that the first caliper body (1) and the second caliper body (2) can change between the first preset angle and the second preset angle.

5. The distraction forceps for posterior spinal internal fixation according to claim 4, characterized in that: A connecting seat (8) is provided at the tail of the first caliper body (1), one end of the connecting seat (8) is fixedly connected to the first caliper body (1), the other end of the connecting seat (8) is arranged toward the accommodating space, and one end of the rack sleeve (6) is rotatably connected to the other end of the connecting seat (8).

6. The distraction forceps for posterior spinal internal fixation according to claim 5, characterized in that: The fixing assembly further comprises a fixing pin (13); the other end of the connecting seat (8) is provided with a connecting groove (81); the side wall of the connecting groove (81) is provided with a pin hole; one end of the rack sleeve (6) is provided with a connecting protrusion (61); the connecting protrusion (61) is provided with a rotating hole; the connecting protrusion (61) is limitedly inserted in the connecting groove (81); The fixing pin (13) is fixedly inserted into the pin hole, and the connecting protrusion (61) is rotatably sleeved on the fixing pin (13).

7. The distraction forceps for posterior spinal internal fixation according to claim 4, characterized in that: The fixing assembly further comprises a paddle seat (9), a paddle shaft (11) and a torsion spring (10); the paddle seat (9) is fixedly arranged on the outer surface of the rack sleeve (6); the paddle shaft (11) is mounted on the paddle seat (9) and is arranged perpendicular to the axial direction of the rack sleeve (6); the paddle (7) is rotatably mounted on the paddle shaft (11); the torsion spring (10) is sleeved on the paddle shaft (11); and the torsion spring (10) is used to drive the paddle (7) to remain in the abutting state.

8. The distraction forceps for posterior spinal internal fixation according to claim 7, characterized in that: The head of the paddle (7) is provided with an abutment portion (71) bent toward the rack condition (5), the middle of the paddle (7) is provided with an axial hole for the paddle shaft (11) to pass through, the tail of the paddle (7) is provided with an anti-slip groove (72), and the anti-slip groove (72) is located on a side of the paddle (7) away from the rack sleeve (6).

9. The distraction forceps for posterior spinal internal fixation according to claim 4, characterized in that: The outer surface of the rack member (5) is provided with scale lines along the direction of extending into the rack sleeve (6), and the scale lines are used to mark or calculate the distance between the heads of the first pliers body (1) and the second pliers body (2).

10. The distraction forceps for posterior spinal internal fixation according to claim 8, characterized in that: The rack sleeve (6) is provided with an abutment hole (63), the abutment hole (63) is communicated with the socket (62), and the abutment portion (71) can pass through the abutment hole (63) and abut against the rack condition (5).

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