Posterior occipital fixing structure and posterior reduction assembly for skull base depression

Abstract

The utility model relates to the technical field of medical instruments, in particular to an occipitocervical posterior approach fixing structure and a skull base depression posterior approach resetting assembly. The occipitocervical posterior fixing structure comprises a fixing plate, two reset connecting rods, two first threaded connecting pieces and two second threaded connecting pieces. A first containing groove is formed in the first threaded connecting piece, a first threaded pressing piece is arranged in the first containing groove, a second containing groove is formed in the second threaded connecting piece, and a second threaded pressing piece is arranged in the second containing groove. The reset connecting rod comprises a reset part and a fixing part, the reset part is pressed in the first containing groove through a first threaded pressing piece, the fixing part is pressed in the second containing groove through a second threaded pressing piece, limiting contact faces are formed on the two sides of the fixing part, and the limiting contact faces are in limiting fit with the corresponding side walls of the second containing groove respectively. The occipital neck posterior fixing structure overcomes the defects that an existing occipital neck posterior fixing structure is poor in stability after being fixed, the connecting rod is prone to rotating under interference of external force, and the fixing precision is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially, and it is a kind of occipito-cervical posterior fixation structure and cranial base invagination posterior reset assembly. BACKGROUND

[0002] Cranial base invagination is a disease occurring in cranio-cervical junction area. Its pathological mechanism is generally atlantoaxial dislocation on the basis of cranio-cervical junction deformity, leading to the upward and backward displacement of axis odontoid process and sinking into foramen magnum, and compressing brain stem or medulla oblongata. It leads to limb sensory motor dysfunction, even paralysis or death of serious consequences.

[0003] The pathological basis of cranial base invagination includes three aspects: (1) atlantoaxial vertical dislocation: it is the main reason for causing cranial sinking and the upper end structure of cervical spine sinking into foramen magnum; (2) atlantoaxial anterior and posterior dislocation, which can cause the anterior and posterior diameters of foramen magnum to be narrowed, and the medulla oblongata to be compressed; (3) the backward tilting of axis, which leads to the decrease of cranial vertebral angle and aggravates the compression of brain stem in front. The above three pathological factors jointly cause the compression of atlas brain stem and medulla oblongata in cranial base invagination, and serious neurological damage symptoms occur.

[0004] The purpose of treating cranial base invagination is mainly to lower and reset the cervical spine structure sinking into foramen magnum by means of instrument, and to correct the abnormal state of cranial vertebral angle, and then to realize reliable occipito-cervical fixation under the reset state. The existing internal fixation instrument for occipito-cervical fixation can only realize the in situ fixation of occipito-cervical structure, and does not have the reset function. Although a certain reset can be obtained with the aid of intraoperative skull traction force, the reset force is difficult to control, and only longitudinal reset can be realized, and the horizontal dislocation of atlantoaxial vertebrae and the odontoid process rotating backward (tilting) cannot be corrected, and the normal cranial vertebral angle cannot be restored, so the surgical effect is not ideal. In addition, the existing occipito-cervical posterior fixation structure has poor stability when fixed after operation, and the connecting rod is easily rotated under the interference of external force, which reduces the fixing accuracy and even leads to fixation failure.

[0005] In order to improve the surgical effect of cranial base invagination, the vertical dislocation and anterior and posterior horizontal dislocation of atlantoaxial vertebrae need to be corrected, and the brain stem compression needs to be improved by correcting the inclination angle of axis. The utility model is a surgical instrument designed based on the pathological principle of cranial base invagination, which can not only realize the controllable reset of vertical lowering, horizontal direction and axis de-rotation of cranial base invagination, but also finally realize the occipito-cervical fixation effect of cranial base invagination under the reset state. The utility model is an instrument designed for realizing the full reset of cranial base invagination and reliable fixation under the reset state. It is composed of axis long-tail single-shaft screw, integrated operation handle connectable with screw, occipital fixation plate with long-tail U-shaped tail cap, occipito-cervical connecting titanium rod with anti-rotation design, and additional tools such as titanium rod tail end pressurizer for realizing the upward lifting of skull. SUMMARY

[0006] The utility model provides a kind of pillow neck posterior fixation structure and cranial base sunken symptom posterior reset assembly, to solve the existing pillow neck posterior fixer instrument lack of reset ability, and its in in postoperative fixation Poor stability, it is easy to make connecting rod rotate under the interference of external force, reduce fixing precision even lead to the defect of fixed failure.

[0007] The utility model provides a kind of pillow neck posterior fixation structure, comprising: fixed plate, two reset connecting rods, two first threaded connectors and two second threaded connectors, two the first threaded connector is located in the fixed plate.

[0008] The first threaded connector is formed with a first receiving groove, a first threaded compression member is arranged in the first receiving groove, the second threaded connector is formed with a second receiving groove, and a second threaded compression member is arranged in the second receiving groove.

[0009] The reset connecting rod includes a reset portion and a fixed portion connected to each other, the reset portion is arranged in the first receiving groove and is compressed in the first receiving groove by the first threaded compression member, and the reset portion has a tendency to move away from the fixed plate, the fixed portion is arranged in the second receiving groove and is compressed in the second receiving groove by the second threaded compression member, two sides of the fixed portion form a limiting contact surface, and the limiting contact surface is limited and matched with the corresponding side wall of the second receiving groove.

[0010] According to the utility model provides a kind of pillow neck posterior fixation structure, the bottom surface of the fixed portion is attached to the bottom of the second receiving groove.

[0011] According to the utility model provides a kind of pillow neck posterior fixation structure, the bottom surface of the fixed portion is formed with a U-shaped attachment surface, and the shape of the bottom of the second receiving groove matches the U-shaped attachment surface.

[0012] According to the utility model provides a kind of pillow neck posterior fixation structure, the first threaded connector includes a mounting seat and two first arc-shaped plates, the mounting seat is arranged on the fixed plate, and two first arc-shaped plates are oppositely arranged on the mounting seat and form the first receiving groove.

[0013] The second threaded connector includes a threaded implantation portion and a connecting portion connected to each other, the connecting portion includes two second arc-shaped plates oppositely arranged, and the second receiving groove is formed between the two second arc-shaped plates.

[0014] According to the pillow neck posterior fixation structure, the first arc-shaped plate comprises a first main body part and a first falling part, the first main body part is connected with the mounting seat, and the first falling part is connected with the first main body part through a broken trace.

[0015] According to the pillow neck posterior fixation structure, two first screw connecting pieces are symmetrically arranged on the fixing plate.

[0016] According to the pillow neck posterior fixation structure, two first screw connecting pieces are symmetrically arranged on the fixing plate.

[0017] The utility model discloses a cranial base invagination posterior reset assembly, including: operating handle, cranial lifting presser and the pillow neck posterior fixation structure of any one described above, the cranial lifting presser includes the first pressure clamping part and the second pressure clamping part of opposite setting.

[0018] In the first working condition, the operating handle is threadedly connected with the second screw connecting piece, so that the handle drives the atlas vertebra reset; in the second working condition, the operating handle is threadedly connected with the first screw connecting piece, so that the operating handle drives the lifting reset of the atlas vertebra, and the head forward inclination is corrected; in the third working condition, the first pressure clamping part abuts one end of the fixing part, and the second pressure clamping part abuts the second screw connecting piece, so as to drive the fixing part to move relative to the second screw connecting piece.

[0019] The cranial base invagination posterior reset assembly further comprises a sheath, in the first working condition, one end of the sheath is sleeved on the second screw connecting piece, and the other end of the sheath is threadedly connected with the handle.

[0020] The cranial base invagination posterior reset assembly further comprises a sheath, in the first working condition, one end of the sheath is sleeved on the second screw connecting piece, and the other end of the sheath is threadedly connected with the handle.

[0021] The utility model provides a pillow neck posterior fixation structure, through setting up limit contact surface on both sides of the fixing part of reset connecting rod respectively, when the fixing part of reset connecting rod is pressed in the second containing groove through the second screw pressure piece, the limit contact surface on both sides of the fixing part can be limited and matched with the side wall corresponding to the second containing groove respectively, so that the rotation of reset connecting rod under external force is prevented, the stability of the fixing structure is improved, and the defects that the existing pillow neck posterior fixation structure is poor in stability after being fixed, is easy to make the connecting rod rotate under the interference of external force, reduces the fixing precision and even leads to the fixation failure are solved.

[0022] The additional aspects and advantages of the present application will be given partly in the following description, some will become obvious from the following description, or will be understood by those skilled in the art through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0024] Figure 1 is a schematic view of a pillow neck posterior fixation structure provided by the present application.

[0025] Figure 2 is a schematic view of a reset connecting rod in the pillow neck posterior fixation structure provided by the present application.

[0026] Figure 3 is a schematic view of a first threaded connecting piece in the pillow neck posterior fixation structure provided by the present application.

[0027] Figure 4 is a schematic view of a second threaded connecting piece in the pillow neck posterior fixation structure provided by the present application.

[0028] Figure 5 is a schematic view of a cranial base depression posterior reset assembly in a first working condition provided by the present application.

[0029] Figure 6 is a schematic view of a cranial base depression posterior reset assembly in a second working condition provided by the present application.

[0030] Figure 7 is a schematic view of a cranial base depression posterior reset assembly in a third working condition provided by the present application.

[0031] Figure 8 is an operation principle diagram of a cranial base depression posterior reset assembly in a first working condition provided by the present application.

[0032] Figure 9 is an operation principle diagram of a cranial base depression posterior reset assembly in a third working condition provided by the present application.

[0033] Figure 10 is a schematic view of a cranial lifting presser in a cranial base depression posterior reset assembly provided by the present application.

[0034] LIST OF REFERENCE NUMERALS

[0035] 10, fixed plate; 20, reset connecting rod; 210, reset part; 220, fixed part; 221, limit contact surface; 222, U-shaped fitting surface; 30, first threaded connecting piece; 310, first accommodating groove; 320, first threaded pressing piece; 330, mounting seat; 340, first arc-shaped plate; 341, first main body part; 342, first falling part; 40, second threaded connecting piece; 410, second accommodating groove; 420, second threaded pressing piece; 430, threaded implanting part; 440, second arc-shaped plate; 441, second main body part; 442, second falling part; 50, operating handle; 60, skull lifting pressurizer; 610, first pressurizing clamping part; 611, limit sink; 620, second pressurizing clamping part; 70, sheath. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described below in conjunction with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature can be "under", "below" and "underneath" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description 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 suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0041] The following will be described in combination with Figures 1 to 10 The present application provides a pillow neck posterior fixation structure and a basilar invagination posterior reduction assembly.

[0042] Referring to Figures 1 to 4 The pillow neck posterior fixation structure provided by the embodiments of the present application comprises: a fixing plate 10, two reset connecting rods 20, two first threaded connecting pieces 30 and two second threaded connecting pieces 40, and the two first threaded connecting pieces 30 are arranged on the fixing plate 10.

[0043] The first threaded connecting piece 30 is formed with a first accommodating groove 310, and the first threaded connecting piece 30 is arranged in the first accommodating groove 310 and is tightly pressed in the first accommodating groove 310 by the first threaded pressing piece 320. The second threaded connecting piece 40 is formed with a second accommodating groove 410, and the second threaded connecting piece 40 is arranged in the second accommodating groove 410 and is tightly pressed in the second accommodating groove 410 by the second threaded pressing piece 420.

[0044] The reset connecting rod 20 comprises a reset part 210 and a fixing part 220 connected with each other, the reset part 210 is arranged in the first accommodating groove 310 and is tightly pressed in the first accommodating groove 310 by the first threaded pressing piece 320, and the reset part 210 has a tendency to move away from the fixing plate 10, the fixing part 220 is arranged in the second accommodating groove 410 and is tightly pressed in the second accommodating groove 410 by the second threaded pressing piece 420, and the two sides of the fixing part 220 are formed with limiting contact surfaces 221, and the limiting contact surfaces 221 are limited and matched with the corresponding side walls of the second accommodating groove 410.

[0045] The pillow neck posterior fixation structure has the advantages that the limiting contact surfaces 221 on the two sides of the fixing portion 220 of the reset connecting rod 20 can be limited and matched with the side walls of the second accommodating groove 410 correspondingly when the fixing portion 220 of the reset connecting rod 20 is pressed into the second accommodating groove 410 through the second threaded pressing piece 420, the rotation of the reset connecting rod 20 under external force is prevented, the stability of the fixing structure is improved, and the defects that the existing pillow neck posterior fixation structure is poor in stability after being fixed, the connecting rod is easily rotated under the interference of external force, the fixing precision is reduced, and even the fixation is failed are solved.

[0046] Specifically, referring to FIG. 1, Figure 1 In the embodiment, the mounting plate is used for being fixed to the skull (the occipital bone middle line region) of a patient through a screw, the two first threaded connecting pieces 30 are symmetrically arranged on the left and right sides of the fixing plate 10, are respectively used for connecting one end of the two reset connecting rods 20, and make the two reset connecting rods 20 keep left-right symmetry.

[0047] One end of the two second threaded connecting pieces 40 is provided with a thread (a threaded implanting portion 430 described below), and the second threaded connecting piece 40 is implanted into the pedicle position of the patient through the thread, the two second threaded connecting pieces 40 are symmetrically arranged and are respectively located at the pedicle positions on the two sides of the dens axis.

[0048] The two first threaded connecting pieces 30 are provided with a fixing hole for fixing the fixing plate 10 to the skull, during the operation, after the fixing plate 10 is positioned, the screw is arranged in the fixing hole and is implanted into the occipital bone middle line region of the patient.

[0049] It should be noted that the reset connecting rod 20 is made of titanium metal with excellent mechanical properties, the titanium metal has a high elastic modulus and can be elastically deformed within a certain range without permanent deformation. After the pillow neck posterior fixation structure is fixed, the reset portion 210 is arranged in the first accommodating groove 310 and is pressed into the first accommodating groove 310 through the first threaded pressing piece 320, the side wall of the reset connecting rod 20 abuts against the bottom of the first threaded pressing piece 320, and the reset portion 210 has a tendency to move away from the fixing plate 10, so that the occipital bone is pulled back and reset under the action of the two reset connecting rods 20.

[0050] Referring to FIG. 1, Figure 1 , Figure 2 and Figure 4As shown, according to some embodiments of the utility model, the bottom surface of the fixed part 220 is attached to the bottom of the second accommodating groove 410. By setting the bottom surface of the fixed part 220 and the bottom of the second accommodating groove 410 as an attached structure, when the first threaded compression part 320 compresses the fixed part 220 of the reset link 20 to the second accommodating groove 410, the gap between the bottom surface of the fixed part 220 of the reset link 20 and the second accommodating groove 410 is first eliminated, at the same time, the limiting contact surfaces 221 formed on both sides of the fixed part 220 are respectively limited and matched with the corresponding side walls of the second accommodating groove 410, which plays a multi-directional limiting and fixing effect on the fixed part 220 of the reset link 20, and further improves the stability of the reset link 20 during fixing.

[0051] Specifically, the attachment of the bottom surface of the fixed part 220 to the bottom of the second accommodating groove 410 can be realized by setting an attached matching structure between the bottom surface of the fixed part 220 and the bottom of the second accommodating groove 410. For example, an arc-shaped protruding structure is arranged on the bottom surface of the fixed part 220, and an arc-shaped groove structure matching the arc-shaped protrusion is arranged on the bottom of the second accommodating groove 410.

[0052] Referring to Figure 1 , Figure 2 and Figure 4 As shown, according to the preferred embodiments of the utility model, the bottom surface of the fixed part 220 is formed with a U-shaped attached surface 222, so that the cross section of the fixed part 220 is horseshoe-shaped, and the shape of the bottom of the second accommodating groove 410 matches the U-shaped attached surface 222. By setting the U-shaped attached surface 222 on the bottom surface of the fixed part 220, and matching the shape of the bottom of the second accommodating groove 410 with the U-shaped attached surface 222, the fixed part 220 can slide relative to the second threaded connecting part 40 under the premise of ensuring the attachment between the bottom surface of the fixed part 220 and the bottom of the second accommodating groove 410, which facilitates the adjustment of the position of the reset link 20.

[0053] Specifically, when it is necessary to adjust the position of the reset link 20, only the second threaded compression part 420 needs to be rotated to eliminate the compression effect of the second threaded compression part 420 on the fixed part 220 of the reset link 20, and subsequently the position of the reset link 20 can be adjusted by using the skull lifting and pressing device 60.

[0054] Referring to Figure 3 and Figure 4As shown, according to some embodiments of the present application, the first threaded connecting piece 30 comprises a mounting seat 330 and two first arc-shaped plates 340, the mounting seat 330 is arranged on the fixed plate 10, and the two first arc-shaped plates 340 are oppositely arranged on the mounting seat 330 and form a first accommodating groove 310; the second threaded connecting piece 40 comprises a threaded implanting part 430 and a connecting part connected with each other, the connecting part comprises two second arc-shaped plates 440 oppositely arranged, and a second accommodating groove 410 is formed between the two second arc-shaped plates 440. By arranging the first threaded connecting piece 30 in the above structure, the first threaded connecting piece 30 can be conveniently fixed on the fixed plate 10, and the reset part 210 of the reset connecting rod 20 can be conveniently placed into the first accommodating groove 310. Similarly, by arranging the second threaded connecting piece 40 in the above structure, the second threaded connecting piece 40 can be conveniently fixed as a whole by implanting the threaded implanting part 430 (provided with external threads) into the pedicle position of the patient, and the fixing part 220 of the reset connecting rod 20 can be conveniently placed into the second accommodating groove 410.

[0055] Specifically, in the embodiment, the mounting seat 330 and the two first arc-shaped plates 340 are integrally arranged, and the mounting seat 330 is connected with the fixed plate 10 through a threaded fastener. The threaded implanting part 430 and the connecting part (the two second arc-shaped plates 440) are integrally arranged.

[0056] Referring to Figure 3 and Figure 4 As shown, according to some embodiments of the present application, the first arc-shaped plate 340 comprises a first main body part 341 and a first falling-off part 342, the first main body part 341 is connected with the mounting seat 330, and the first falling-off part 342 is connected with the first main body part 341 through a broken trace; the second arc-shaped plate 440 comprises a second main body part 441 and a second falling-off part 442, the second main body part 441 is connected with the threaded implanting part 430, and the second falling-off part 442 is connected with the second main body part 441 through a broken trace. By arranging the first arc-shaped plate 340 and the second arc-shaped plate 440 in the form that the main body part is connected with the falling-off part through a broken trace, the first falling-off part 342 and the second falling-off part 442 can be broken and fallen off after the pillow and neck posterior fixation structure is fixed, so that the occupied space of the fixation structure is reduced.

[0057] The pillow and neck posterior fixation structure described above can be correspondingly referred to.

[0058] Referring to Figures 5 to 7 As shown, the pillow and neck posterior fixation structure provided by the embodiment of the present application comprises an operating handle 50, a skull lifting press 60, and the pillow and neck posterior fixation structure described in any one of the above embodiments; the skull lifting press 60 comprises a first press clamping part 610 and a second press clamping part 620 oppositely arranged.

[0059] In the first working condition, the operating handle 50 is threadedly connected with the second threaded connecting piece 40 to drive the axis vertebra to reset through the operating handle 50; in the second working condition, the operating handle 50 is threadedly connected with the first threaded connecting piece 30 to drive the occipital bone to reset through the operating handle 50, and correct the head forward inclination; in the third working condition, the first pressurizing clamping part 610 abuts against one end of the fixed part 220, and the second pressurizing clamping part 620 abuts against the second threaded connecting piece 40 to drive the fixed part 220 to move relative to the second threaded connecting piece 40.

[0060] The occipitoposterior reset assembly for basilar invagination provided by the utility model can significantly improve the fixing stability of the fixing structure when the operation is completed. The axis vertebra can be driven to reset and the occipital bone can be driven to reset in the operation through the operating handle 50, the head forward inclination can be corrected, the longitudinal reset of the atlantoaxial joint can be driven in the operation through the skull lifting pressurizer 60, the longitudinal dislocation of the axis vertebra can be corrected, and the axis vertebra can be pulled out of the foramen magnum.

[0061] Referring to FIG. 1, Figure 8 As shown in FIG. 1, the operating handle 50 is used for threadedly connecting with the second threaded connecting piece 40, and the operator drives the axis vertebra to press downward and rotate counterclockwise through the operating handle 50, and the assistant tilts the head backward to realize the forward and backward reset of the axis vertebra and correct the backward inclination of the axis vertebra (the forward inclination of the skull).

[0062] Referring to FIG. 1, Figure 9 As shown in FIG. 1, the skull lifting pressurizer 60 is used for the longitudinal reset of the axis vertebra to correct the longitudinal dislocation of the axis vertebra and pull the axis vertebra out of the foramen magnum. During the operation, the first pressurizing clamping part 610 abuts against one end of the fixed part 220, and the second pressurizing clamping part 620 abuts against the second threaded connecting piece 40 to realize the longitudinal reset of the atlantoaxial joint, correct the longitudinal dislocation of the axis vertebra, and pull the axis vertebra out of the foramen magnum.

[0063] Referring to FIG. 1, Figure 5 According to some embodiments of the utility model, the occipitoposterior reset assembly further comprises a sheath 70, one end of the sheath 70 is sleeved on the second threaded connecting piece 40, and the other end of the sheath 70 is threadedly connected with the handle. Since the connecting part of the second threaded connecting piece 40 comprises two second arc-shaped plates 440 arranged oppositely, the sheath 70 can protect the two second arc-shaped plates 440 from over-deformation when the operating handle 50 is forced, so that the second threaded connecting piece 40 is prevented from being disabled.

[0064] Referring to FIG. 1, Figure 10As shown, according to some embodiments of the present invention, the first pressure clamping part 610 is provided with a limiting groove 611 that matches one end of the fixing part 220. By providing a limiting groove 611 that matches one end of the fixing part 220 on the first pressure clamping part 610, the limiting groove 611 can be used to limit and abut against the fixing part 220, thereby improving the stability of the craniotomy pressure device 60 during surgery and simplifying the surgical operation.

[0065] The surgical procedure for using the posterior approach reduction component for basilar impression provided by this invention is described in detail below. (See attached image.) Figures 1 to 10 As shown.

[0066] Second threaded connectors 40 are inserted at the pedicles on both sides of the axis, and the fixation plate 10 is fixed to the midline region of the patient's occipital bone with screws.

[0067] The pre-bent repositioning link 20 is inserted into the second receiving groove 410 of the corresponding second threaded connector 40, and then pressed into the second receiving groove 410 by the second threaded clamping member 420 to form a stable fixation. A distance is left between the repositioning part 210 of the repositioning link 20 and the fixing plate 10. After the repositioning part 210 is pressed by the first threaded clamping member 320, the repositioning part 210 tends to move away from the fixing plate 10, thereby achieving posterior repositioning of the occipital bone.

[0068] The sheath 70 is fitted onto the end of the second threaded connector 40, and the operating handle 50 is threaded through the sheath 70 and threaded onto the second threaded connector 40. Then the sheath 70 is threaded onto the operating handle 50, so that the second threaded connector 40 and the operating handle 50 are connected as a whole.

[0069] The operator holds two control handles 50 with each hand, according to... Figure 7 Apply force in the indicated direction to press the patient's axis forward and downward, and rotate it counterclockwise. The assistant tilts the head back to achieve the anterior and posterior repositioning of the axis and correct the posterior tilt of the axis (anterior tilt of the skull). Then remove the operating handle 50 and the protective sleeve 70.

[0070] The operating handle 50 is threadedly connected to the first threaded connector 30 to further lift and reposition the occipital bone, correcting the forward tilt of the head.

[0071] Release the clamping effect of the second threaded clamping member 420 on the fixing part 220 of the repositioning connecting rod 20, and place the first pressure clamping part 610 against one end of the fixing part 220 and the second pressure clamping part 620 against the second threaded connector 40. Apply longitudinal pressure to achieve longitudinal repositioning of the atlantoaxial joint, correct the longitudinal dislocation of the axis, and pull it out of the foramen magnum.

[0072] Tightening the second threaded fastener 420 to press the fixed part 220 of the reset link 20 in the second accommodating groove 410, and then breaking the falling parts of the first arc plate 340 and the second arc plate 440 from the main body part, thus, the surgical reset and fixation are completed.

[0073] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A posterior cervical fixation structure, characterized in that, include: The fixed plate, two reset connecting rods, two first threaded connectors and two second threaded connectors are provided on the fixed plate; The first threaded connector has a first receiving groove, and a first threaded clamping member is provided in the first receiving groove; the second threaded connector has a second receiving groove, and a second threaded clamping member is provided in the second receiving groove. The reset link includes a reset part and a fixing part connected to each other. The reset part passes through the first receiving groove and is pressed into the first receiving groove by the first threaded clamping member, and the reset part tends to move away from the fixing plate. The fixing part passes through the second receiving groove and is pressed into the second receiving groove by the second threaded clamping member. Limiting contact surfaces are formed on both sides of the fixing part, and the limiting contact surfaces respectively limit the engagement with the side wall of the second receiving groove.

2. The posterior cervical fixation structure according to claim 1, characterized in that, The bottom surface of the fixing part is in contact with the bottom of the second receiving groove.

3. The posterior cervical fixation structure according to claim 2, characterized in that, The bottom surface of the fixing part is formed with a U-shaped fitting surface, and the shape of the bottom of the second receiving groove matches the U-shaped fitting surface.

4. The posterior cervical fixation structure according to claim 1, characterized in that, The first threaded connector includes a mounting base and two first arc-shaped plates. The mounting base is disposed on the fixed plate, and the two first arc-shaped plates are disposed opposite to each other on the mounting base and form the first receiving groove. The second threaded connector includes a threaded insertion part and a connecting part that are connected to each other. The connecting part includes two second arc-shaped plates that are disposed opposite each other, and a second receiving groove is formed between the two second arc-shaped plates.

5. The posterior cervical fixation structure according to claim 4, characterized in that, The first arc-shaped plate includes a first main body and a first detachable part. The first main body is connected to the mounting base, and the first detachable part is connected to the first main body through a break line. The second arc-shaped plate includes a second main body and a second detached part. The second main body is connected to the threaded implanted part, and the second detached part is connected to the second main body through a break line.

6. The posterior cervical fixation structure according to any one of claims 1 to 5, characterized in that, Two of the first threaded connectors are symmetrically arranged on the fixed plate.

7. The posterior cervical fixation structure according to claim 6, characterized in that, A fixing hole for fixing the fixing plate to the skull is provided between the two first threaded connectors.

8. A posterior reduction assembly for basilar impression, characterized in that, include: The operating handle, the craniotomy pressure device, and the posterior cervical fixation structure as described in any one of claims 1 to 7; The craniotomy pressure device includes a first pressure clamping part and a second pressure clamping part arranged opposite to each other; In the first working condition, the operating handle is threadedly connected to the second threaded connector to drive the pivot to reset via the operating handle; In the second working condition, the operating handle is threadedly connected to the first threaded connector to drive the occipital bone to be lifted and reset through the operating handle, thereby correcting the forward tilt of the head; In the third operating condition, the first pressure clamping part abuts against one end of the fixed part, and the second pressure clamping part abuts against the second threaded connector to drive the fixed part to move relative to the second threaded connector.

9. The posterior approach reduction assembly for basilar impression according to claim 8, characterized in that, It also includes a protective sleeve. In the first working condition, one end of the protective sleeve is fitted onto the second threaded connector, and the other end of the protective sleeve is threadedly connected to the handle.

10. The posterior approach reduction assembly for basilar impression according to claim 8, characterized in that, The first pressure clamping part is provided with a limiting groove that matches one end of the fixing part.

Images