Neck posterior approach operation C-shaped headstock free of head nails

Abstract

The invention belongs to the field of spine surgery auxiliary instruments, and provides a head-nail-free cervical posterior approach surgery C-shaped headstock which comprises two bearing frames arranged in parallel, the vertical section contour of each bearing frame is in a concave shape, a bearing plate is arranged between the tops of one ends of the two bearing frames, and supporting columns which are vertically and slidably connected are symmetrically arranged on the bearing plate; c-shaped headstocks are arranged at the tops of the two supporting columns, and notches of the two C-shaped headstocks are opposite to each other; the operating table further comprises a linkage disc, the linkage disc is rotationally connected to the supporting column and movably attached to the top of the bearing plate, a control assembly for adjusting the distance between the two C-shaped headstocks is arranged on the outer side wall of the linkage disc, and a bed head clamping assembly fixed to the operating table is arranged on the outer side wall of the bearing frame. Compared with a traditional head nail fixing mode, the C-shaped head frame has the advantages that shaving is not needed any more, scalp penetrating is not needed, and postoperative safety is improved.

Description

Technical Field

[0001] The invention belongs to the field of spinal surgery auxiliary instruments, in particular to a C-shaped head frame for posterior cervical surgery without head nails. Background Art

[0002] Posterior cervical spine surgery is an important treatment for cervical spine diseases in spinal surgery. It is mainly used to relieve compression of the spinal cord or nerve roots and restore cervical spine stability. It is suitable for patients with multi-segment cervical spine lesions or severe spinal cord compression.

[0003] During posterior cervical spine surgery, patients usually lie prone, and their heads need to be fixed to a head frame to maintain the stability of the surgical area. Traditional head frames require three skull screws to penetrate the scalp to achieve skull fixation. Although this can provide intraoperative stability, the hair needs to be shaved before using the head frame. For women who love beauty, they will refuse surgery in order to avoid shaving their hair, which reduces the adaptability of the device. Statistics show that approximately 3.7% of cases experience cerebrospinal fluid leakage at the skull perforation, and 2.1% develop screw tract infection. For patients with osteoporosis, the incidence of fixation failure caused by screw cutting is as high as 5.6%, increasing the risk after surgery. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a C-shaped head frame for posterior cervical surgery without head pins, so as to solve the problems in the prior art of using head pins to fix the patient during posterior cervical surgery, requiring shaving of the patient's hair and increasing postoperative risks.

[0005] A C-shaped head frame for posterior cervical surgery without head pins, comprising two parallel supporting frames, each having a concave vertical cross-sectional profile, a supporting plate disposed between the tops of one end of the two supporting frames, symmetrically provided with vertically sliding support columns, and a C-shaped head frame for securing the head disposed on the tops of the two support columns, with the notches of the two C-shaped head frames facing each other.

[0006] It also includes a linkage disk, which is fixedly connected to the support column and movably fits with the top of the supporting plate. The outer wall of the linkage disk is provided with a control component for adjusting the distance between the two C-shaped head frames, and the outer wall of the supporting frame is provided with a bedside clamping component fixed to the operating bed.

[0007] Preferably, the vertical sections on both sides of the "concave" shape of the load-bearing frame are inconsistent in height, and the load-bearing plate is fixedly installed on the top of the vertical section of the load-bearing frame on the side with the lower height. A sliding groove is provided inside the load-bearing plate, and the vertical cross-sectional profile of the sliding groove is an inverted "T" shape. The bottom of the support column is fixedly connected to a sliding plate, and the sliding plate slides in the "T"-shaped horizontal section of the sliding groove, and the support column is movably located in the "T"-shaped horizontal section of the sliding groove. A headrest is provided at the top center of the load-bearing plate.

[0008] Preferably, an inward-concave limiting groove is provided on the outer circular wall of the linkage disk, and the cross-sectional profile of the limiting groove is annular. The control component includes a spacing adjustment plate and a control cylinder. One side of the spacing adjustment plate is movably located in the limiting groove. The spacing adjustment plate is provided with an inclined portion on the side close to the support column. The control cylinder is fixedly installed in the "recessed" mouth of the supporting plate and placed horizontally. The end of the piston rod of the control cylinder is fixedly connected to the spacing adjustment plate. The closer the inclined portions on the two spacing adjustment plates are to the control cylinder, the gradually smaller the spacing between the two is.

[0009] Preferably, the C-shaped head frame consists of a top plate and two coordination plates, the two coordination plates are slidably mounted on the top plate, the top plate is fixed on the top of the support column, and the other ends of the two coordination plates are respectively provided with a chin plate and a forehead plate, and the chin plates and forehead plates on the two C-shaped head frames are positioned relative to each other.

[0010] Preferably, the headrest is located between the two C-shaped head frames, and adjustment holes are symmetrically provided on each top plate and on both sides of the support column. An adjustment rod extending from the adjustment hole is provided at the bottom of each coordination plate, and a threaded locking nut is provided on the adjustment rod.

[0011] Preferably, the headboard engaging assembly includes a connecting frame, a positioning rod and a support plate, the number of the connecting frames is two and they are detachably connected to the top of the supporting frame away from the supporting plate, the vertical cross-sectional profile of the connecting frame is an inverted "L" shape, the positioning rod is fixedly connected to the connecting frame away from the supporting frame near the top position, the support plate is located below the positioning rod and movably connected to the connecting frame, a vertical guide rail is provided on the outer side wall of the "L"-shaped vertical section of the connecting frame, a movably connected lifting block is provided on the vertical guide rail, the other side of the lifting block is fixedly connected to the support plate, the bottom of the support plate is symmetrically provided with two rows of spaced-apart tooth grooves, and the vertical cross-sectional profile of the tooth groove is serrated.

[0012] Preferably, a mating plate is fixedly installed at the bottom of the "L"-shaped vertical section of the connecting frame, and the vertical cross-sectional profile of the mating plate is "U"-shaped. A guide plate is provided under the connecting frame, and the two mating plates are slidably connected on the guide plate. A positioning shaft is provided on the side of the mating plate away from the supporting frame, and a rotatably connected positioning plug plate is provided on the positioning shaft, and the latch teeth fixedly connected to the head of the positioning plug plate cooperate with the latch tooth groove.

[0013] Preferably, a vertical positioning socket is provided on the guide plate, a lower top cover is provided at the bottom of the mating plate, a positioning rod is provided inside the lower top cover, a reset spring is provided on the positioning rod, and the positioning rod passes through the mating plate and is inserted into the positioning socket.

[0014] Preferably, side baffles are provided at both ends of the supporting plate, and positioning screws are symmetrically provided on the two side baffles, and the positioning screws pass through the side baffles and are locked in the supporting plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This invention revolutionizes the traditional fixation method for posterior cervical surgery. The traditional method requires shaving the hair before posterior cervical surgery, and then three skull screws are inserted through the scalp to achieve skull fixation, providing intraoperative stability.

[0017] The present invention is completely different: through the setting of a supporting frame, a supporting plate is set between the two supporting frames, a supporting column is slidably connected to the supporting plate, and a C-shaped head frame is connected to the top of the supporting column, wherein the two C-shaped head frames are close to each other and fixed at the forehead and chin of the head. The control component can not only achieve the fixation of the C-shaped head frame to ensure the stability of the head, but also can be adjusted according to the size of different heads to improve flexibility. There is no need to shave the hair before surgery, reducing the impact on the person's appearance, and most importantly, no nails are used to penetrate the scalp. Compared with the traditional method, it avoids the risks of postoperative risks and improves postoperative safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the components of the overall headgear device of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the supporting frame, supporting plate and other components of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the internal components of the load-bearing plate and the limiting plate of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the C-type head frame components of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the integral bedside clamping assembly of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the supporting plate, positioning plug plate and other components of the present invention;

[0024] Figure 7 It is a schematic structural diagram of the guide plate, matching plate and other components of the present invention.

[0025] In the picture:

[0026] 1. Carrying frame; 2. Carrying plate; 3. Support column; 4. C-type head frame; 4-1. Top plate; 4-2. Coordinating plate; 5. Linkage disk; 6. Sliding groove; 7. Sliding plate; 8. Headrest; 9. Limiting groove; 10. Spacing adjustment plate; 10-1. Inclined part; 11. Control cylinder; 12. Chin plate; 13. Forehead plate; 14. Adjustment hole; 15. Adjustment rod; 16. Locking nut; 17. Connecting frame; 18. Positioning rod; 19. Support plate; 20. Vertical guide rail; 21. Lifting block; 22. Tooth groove; 23. Matching plate; 24. Guide plate; 25. Positioning shaft; 26. Positioning plate; 27. Positioning socket; 28. Lower top cover; 29. ​​Positioning rod; 30. Return spring; 31. Side baffle; 32. Positioning screw DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] As attached Figure 1 To the attached Figure 7 As shown:

[0029] Embodiment 1: The present invention provides a C-shaped head frame for posterior cervical surgery without head pins, comprising two parallel supporting frames 1, each having a concave vertical cross-sectional profile. A supporting plate 2 is provided between the tops of one end of the two supporting frames 1, and support columns 3 symmetrically provided on the supporting plate 2 for vertical sliding connection. A C-shaped head frame 4 for fixing the head is provided on the tops of the two support columns 3, and the notches of the two C-shaped head frames 4 face each other.

[0030] It also includes a linkage disk 5, which is fixedly connected to the support column 3 and movably fits with the top of the supporting plate 2. The outer wall of the linkage disk 5 is provided with a control component for adjusting the distance between the two C-shaped head frames 4, and the outer wall of the supporting frame 1 is provided with a bedside clamping component fixed to the operating bed.

[0031] It should be noted that, through the setting of the supporting frame 1, a supporting plate 2 is set between the two supporting frames 1, a support column 3 is slidably connected to the supporting plate 2, and a C-shaped head frame 4 is connected to the top of the support column 3, wherein the two C-shaped head frames 4 are close to each other and fixed at the forehead and chin of the head. The control component can not only achieve the fixation of the C-shaped head frame 4 to ensure the stability of the head, but also can be adjusted according to the size of different heads to improve flexibility. There is no need to shave the hair before surgery, which reduces the impact on people's appearance. And most importantly, no nails are used to penetrate the scalp. Compared with the traditional method, it avoids the risks after surgery and improves postoperative safety.

[0032] In this embodiment, the vertical sections on both sides of the "concave" shape of the load-bearing frame 1 are inconsistent in height, and the load-bearing plate 2 is fixedly installed on the top of the vertical section of the load-bearing frame 1 on the side with the lower height. A sliding groove 6 is provided inside the load-bearing plate 2, and the vertical cross-sectional profile of the sliding groove 6 is an inverted "T" shape. The bottom of the support column 3 is fixedly connected to a sliding plate 7, and the sliding plate 7 slides in the "T"-shaped horizontal section of the sliding groove 6. The support column 3 is movably located in the "T"-shaped horizontal section of the sliding groove 6. A headrest 8 is provided at the top center position of the load-bearing plate 2.

[0033] It should be noted that the cross-sectional dimension of the sliding plate 7 is larger than the cross-sectional dimension of the support column 3. The cross-sectional profile of the sliding plate 7 is rectangular, and it is movably fitted with the inner opposite surface of the sliding groove 6. Therefore, after the sliding plate 7 is placed in the sliding groove 6, on the one hand, the support column 3 will not be separated from the sliding groove 6, and when the support column 3 moves, it is restricted by the sliding plate 7, which can prevent the support column 3 from rotating during the movement, thereby ensuring that the C-type head frame 4 will not rotate. A headrest 8 is set at the top center position of the supporting plate 2, so that after the device is fixed on the operating bed, the person lies on the operating bed with his head resting on the headrest 8, which facilitates the C-type head frame 4 to fix the head.

[0034] In this embodiment, an inward-concave limiting groove 9 is provided on the outer circular wall of the linkage disk 5, and the cross-sectional profile of the limiting groove 9 is annular. The control component includes a spacing adjustment plate 10 and a control cylinder 11. One side of the spacing adjustment plate 10 is movably located in the limiting groove 9. The spacing adjustment plate 10 is provided with an inclined portion 10-1 on the side close to the support column 3. The control cylinder 11 is fixedly installed in the "recessed" mouth of the bearing plate 2 and placed horizontally. The end of the piston rod of the control cylinder 11 is fixedly connected to the spacing adjustment plate 10. The closer the inclined portions 10-1 on the two spacing adjustment plates 10 are to the control cylinder 11, the smaller the distance between the two gradually becomes.

[0035] It should be noted that a limit groove 9 is provided on the outer wall of the linkage disk 5, and one side of the spacing adjustment plate 10 is inserted into the limit groove 9. An inclined portion 10-1 is provided on one side of the spacing adjustment plate 10, and the inclined portion 10-1 is an inclined slope. When the head of the patient undergoing surgery needs to be fixed, the control cylinder 11 is started to drive the piston rod to move forward, and the inclined portion 10-1 on the spacing adjustment plate 10 dynamically fits with the inner ring wall of the limit groove 9. As the spacing adjustment plate 10 moves forward, the distance between the two inclined portions 10-1 gradually decreases, driving the linkage disk 5 to slide closer to each other on the supporting plate 2, so that the two C-shaped head frames 4 are close to each other. On the one hand, the head can be fixed, and it can also be adjusted according to the size of the head, thereby improving the flexibility of the device.

[0036] In this embodiment, the C-shaped head frame 4 is composed of a top plate 4-1 and two coordination plates 4-2. The two coordination plates 4-2 are slidably installed on the top plate 4-1. The top plate 4-1 is fixed to the top of the support column 3. The other ends of the two coordination plates 4-2 are respectively provided with a chin plate 12 and a forehead plate 13, and the chin plates 12 and forehead plates 13 on the two C-shaped head frames 4 are positioned relative to each other.

[0037] It should be noted that the C-type head frame 4 is composed of a top plate 4-1 and two coordination plates 4-2. The top plate 4-1 and the coordination plate 4-2 are both arc-shaped plates. The coordination plate 4-2 is installed on the top of the top plate 4-1. The farthest ends of the two coordination plates 4-2 on one side are respectively installed with a chin plate 12 and a forehead plate 13. The chin plate 12 is a U-shaped plate that fixes the chin part, and the forehead plate 13 fixes the forehead position of the patient's head. After the C-type head frames 4 are close to each other, the coordination plates 4-2 fix the two sides of the head, the chin plate 12 fixes the chin position, and the forehead plate 13 fixes the forehead position, thereby achieving complete fixation of the head, which can avoid shaking of the head during surgery and improve the stability of the surgery.

[0038] In this embodiment, the headrest 8 is located between the two C-shaped head frames 4, and adjustment holes 14 are symmetrically provided on each top plate 4-1 and on both sides of the support column 3. An adjustment rod 15 extending from the adjustment hole 14 is provided at the bottom of each coordination plate 4-2, and a locking nut 16 with a threaded connection is provided on the adjustment rod 15.

[0039] It should be noted that, by adjusting the hole 14 on the top plate 4-1, the adjusting rod 15 is fixed to the bottom of the coordination plate 4-2, and the adjusting rod 15 can be moved in the adjusting hole 14, so that the position of the chin plate 12 and the forehead plate 13 on the coordination plate 4-2 can be adjusted, and further adjusted according to the person's face shape. After the adjustment is completed, the locking nut 16 is threadedly matched with the adjusting rod 15, and the locking nut 16 and the top plate 4-1 fit each other to achieve the fixation of the coordination plate 4-2, which can better adapt to people with different face shapes and further improve the stability of the head.

[0040] In this embodiment, the headboard locking assembly includes a connecting frame 17, a positioning rod 18 and a support plate 19. There are two connecting frames 17 and they are detachably connected to the top of the supporting frame 1 away from the supporting plate 2. The vertical cross-sectional profile of the connecting frame 17 is an inverted "L" shape. The positioning rod 18 is fixedly connected to the connecting frame 17 away from the supporting frame 1 near the top position. The support plate 19 is located below the positioning rod 18 and is movably connected to the connecting frame 17. A vertical guide rail 20 is provided on the outer wall of the "L"-shaped vertical section of the connecting frame 17. A movably connected lifting block 21 is provided on the vertical guide rail 20. The other side of the lifting block 21 is fixedly connected to the support plate 19. The bottom of the support plate 19 is symmetrically provided with two rows of spaced-apart tooth grooves 22, and the vertical cross-sectional profile of the tooth grooves 22 is serrated.

[0041] It should be noted that, through the bedside clamping assembly, when the device needs to be fixed, two holes will be pre-opened on the operating bed, and the connecting frame 17 will be attached to the edge of the bed. A fixedly connected positioning rod 18 is provided on one side of the connecting frame 17. The positioning rod 18 cooperates with the hole on the operating bed, and is inserted into the hole and locked, so that the device can be fixed on the bed surface. The person lies on the bed for surgery, and the support plate 19 is located under the bed, so that the support plate 19 is attached to the bottom of the bed, further supporting the device, ensuring the stability of the device, and making it firmly installed on the head of the operating bed.

[0042] A vertical guide rail 20 is provided on the connecting frame 17, and the support plate 19 is movably connected to the vertical guide rail 20 through a lifting block 21. The height of the support plate 19 can be adjusted. When the connecting frame 17 is placed on the operating bed, it can be supported by adjusting the height of the support plate 19 to adapt to different types of operating beds.

[0043] In this embodiment, a mating plate 23 is fixedly installed at the bottom of the "L"-shaped vertical section of the connecting frame 17. The vertical cross-sectional profile of the mating plate 23 is a "U" shape. A guide plate 24 is provided at the bottom of the connecting frame 17. The two mating plates 23 are slidably connected to the guide plate 24. A positioning shaft 25 is provided on the side of the mating plate 23 away from the supporting frame 1. A rotatably connected positioning plug plate 26 is provided on the positioning shaft 25, and the latch teeth fixedly connected to the head of the positioning plug plate 26 cooperate with the latch tooth groove 22.

[0044] It should be noted that the positioning plug plate 26 is rotatably connected to the guide plate 24, and a latch tooth is provided on the top of the positioning plug plate 26. The latch tooth and the latch tooth groove 22 are both serrated. Therefore, when the support plate 19 supports the connecting frame 17, the positioning plug plate 26 is rotated so that the latch tooth on the positioning plug plate 26 is inserted into the latch tooth groove 22. The angle between the positioning plug plate 26 and the support plate 19 is an acute angle, so that the support plate 19 can be fixed.

[0045] In this embodiment, a vertical positioning hole 27 is provided on the guide plate 24, a lower top cover 28 is provided at the bottom of the mating plate 23, a positioning rod 29 is provided inside the lower top cover 28, a reset spring 30 is provided on the positioning rod 29, and the positioning rod 29 passes through the mating plate 23 and is inserted into the positioning hole 27.

[0046] It should be noted that the matching plate 23 is slidably connected to the guide plate 24, and the supporting frame 1 and the connecting frame 17 are detachably connected. When the operation is completed, the two are disassembled, the positioning socket 27 is pulled downward, and the reset spring 30 is compressed. When the positioning rod 29 is disengaged from the positioning socket 27, the matching plate 23 can be slid out of the guide plate 24. If it is damaged in the future, it can be replaced without replacing the entire thing, thereby reducing costs.

[0047] In this embodiment, side baffles 31 are provided at both ends of the supporting plate 2 . Positioning screws 32 are symmetrically provided on the two side baffles 31 . The positioning screws 32 pass through the side baffles 31 and are locked in the supporting plate 2 .

[0048] It should be noted that the side baffle 31 extends out of the bearing plate 2 and movably fits with the side wall of the spacing adjustment plate 10, thereby limiting the stroke of the spacing adjustment plate 10, avoiding displacement caused by force during the movement of the linkage disk 5, and improving stability.

[0049] It is additionally added that: after the device is installed through the bedside clamping assembly, the supporting plate 2 at the head of the operating bed is sunken, and there is a suitable gap between the two supporting plates 2, and there is no obstruction between them. It can meet the airway management of general anesthesia before the operation in the later stage, and it is also convenient for the surgeon to perform surgery on the posterior cervical route.

[0050] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A C-shaped head frame for posterior cervical surgery without head pins, characterized by: include: Two parallel supporting frames (1) are provided, wherein the vertical cross-sectional profile of the supporting frames (1) is concave, a supporting plate (2) is provided between the tops of one end of the two supporting frames (1), and support columns (3) connected vertically and slidably are symmetrically provided on the supporting plate (2), and a C-shaped head frame (4) for fixing the head is provided on the tops of the two support columns (3), and the notches of the two C-shaped head frames (4) are opposite to each other; The invention also includes a linkage disk (5), which is fixedly connected to the support column (3) and movably fits with the top of the carrier plate (2); a control component for adjusting the distance between the two C-shaped head frames (4) is provided on the outer wall of the linkage disk (5); and a bedside clamping component fixed to the operating bed is provided on the outer wall of the carrier frame (1).

2. The C-shaped head frame for posterior cervical surgery without head pins as claimed in claim 1, characterized in that: The vertical sections on both sides of the "concave" shape of the carrier frame (1) are inconsistent in height. The carrier plate (2) is fixedly installed on the top of the vertical section of the carrier frame (1) on the side with the lower height. A sliding groove (6) is provided inside the carrier plate (2). The vertical cross-sectional profile of the sliding groove (6) is an inverted "T" shape. The bottom of the support column (3) is fixedly connected with a sliding plate (7). The sliding plate (7) slides in the "T"-shaped transverse section of the sliding groove (6). The support column (3) is movably located in the "T"-shaped transverse section of the sliding groove (6). A headrest (8) is provided at the center position of the top of the carrier plate (2).

3. The C-shaped head frame for posterior cervical surgery without head pins as claimed in claim 2, characterized in that: The outer circular wall of the linkage disk (5) is provided with an inwardly concave limiting groove (9), and the cross-sectional profile of the limiting groove (9) is annular. The control component comprises a spacing adjustment plate (10) and a control cylinder (11). One side of the spacing adjustment plate (10) is movably located in the limiting groove (9), and the side of the spacing adjustment plate (10) close to the support column (3) is provided with an inclined portion (10-1). The control cylinder (11) is fixedly installed in the "recessed" mouth of the bearing plate (2) and is placed horizontally. The end of the piston rod of the control cylinder (11) is fixedly connected to the spacing adjustment plate (10), and the closer the inclined portions (10-1) on the two spacing adjustment plates (10) are to the control cylinder (11), the smaller the spacing between the two gradually decreases.

4. The C-shaped head frame for posterior cervical surgery without head pins as claimed in claim 1, characterized in that: The C-shaped head frame (4) is composed of a top plate (4-1) and two coordination plates (4-2), the two coordination plates (4-2) are slidably mounted on the top plate (4-1), the top plate (4-1) is fixed to the top of the support column (3), and the other ends of the two coordination plates (4-2) are respectively provided with a chin plate (12) and a forehead plate (13), and the chin plates (12) and the forehead plates (13) on the two C-shaped head frames (4) are positioned relative to each other.

5. The C-shaped head frame for posterior cervical surgery without head pins as claimed in claim 4, characterized in that: The headrest (8) is located between the two C-shaped head frames (4); an adjustment hole (14) is symmetrically provided on each top plate (4-1) and on both sides of the support column (3); an adjustment rod (15) extending from the adjustment hole (14) is provided at the bottom of each coordination plate (4-2); and a locking nut (16) is provided on the adjustment rod (15) and is threadedly connected.

6. The C-shaped head frame for posterior cervical surgery without head pins as claimed in claim 1, characterized in that: The bedside clamping assembly comprises a connecting frame (17), a positioning rod (18), and a support plate (19). The number of the connecting frames (17) is two and they are detachably connected to the top of the side of the carrier frame (1) away from the carrier plate (2). The vertical cross-sectional profile of the connecting frame (17) is an inverted "L" shape. The positioning rod (18) is fixedly connected to the connecting frame (17) at a position close to the top of the side away from the carrier frame (1). The support plate (19) is located below the positioning rod (18) and is movably connected to the connecting frame (17). A vertical guide rail (20) is provided on the outer side wall of the "L"-shaped vertical section of the connecting frame (17). A movably connected lifting block (21) is provided on the vertical guide rail (20). The other side of the lifting block (21) is fixedly connected to the support plate (19). The bottom of the support plate (19) is symmetrically provided with two rows of spaced-apart tooth grooves (22). The vertical cross-sectional profile of the tooth groove (22) is sawtooth-shaped.

7. The C-shaped head frame for posterior cervical surgery without head pins as claimed in claim 6, characterized in that: A matching plate (23) is fixedly installed at the bottom of the "L"-shaped vertical section of the connecting frame (17), and the vertical cross-sectional profile of the matching plate (23) is "return"-shaped. A guide plate (24) is provided below the connecting frame (17), and two matching plates (23) are slidably connected to the guide plate (24). A positioning shaft (25) is provided on the side of the matching plate (23) away from the supporting frame (1), and a rotatably connected positioning plug plate (26) is provided on the positioning shaft (25), and the latching teeth fixedly connected to the head of the positioning plug plate (26) cooperate with the latching tooth groove (22).

8. The C-shaped head frame for posterior cervical surgery without head pins as claimed in claim 7, characterized in that: A vertical positioning socket (27) is provided on the guide plate (24), a lower cover (28) is provided at the bottom of the matching plate (23), a positioning rod (29) is provided inside the lower cover (28), a return spring (30) is provided on the positioning rod (29), and the positioning rod (29) passes through the matching plate (23) and is inserted into the positioning socket (27).

9. The C-shaped head frame for posterior cervical surgery without head pins as claimed in claim 1, characterized in that: Side baffles (31) are provided at both ends of the bearing plate (2), and positioning screws (32) are symmetrically provided on the two side baffles (31). The positioning screws (32) pass through the side baffles (31) and are locked in the bearing plate (2).

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