Oral prepharyngeal anterior cervical fixation device with self-lifting reset function

Abstract

The utility model relates to medical instrument technical field especially through the mouth pharynx pre -frontal pillow neck fixing device, including crossbeam, two upper side wings are established to the upper part of both ends of crossbeam oppositely, two lower side wings are established to the lower part of both ends of crossbeam oppositely, the surface arc of atlas of crossbeam and human body is in accord with, the end of upper side wing is upturned, the surface morphology of upturned part and pillow condyle is anatomically fitted, the surface arc of pivot of lower side wing and human body is in accord with. Crossbeam and human body atlas surface arc in the utility model are in accord with, and further improved the fitting degree between atlas, strengthened the fixed effect, the upper side wing can be connected with pillow bone, and with pillow condyle anatomically fitted, further strengthen the fixed effect, the lower side wing and reset board cooperation can reset the pivot joint of dislocation. Adopt the utility model can be in the mouth pharynx release operation, realize atlas pivot joint dislocation reset and atlas - pillow - pivot joint pre -frontal and fixed, treat atlas pillow joint instability and atlas pivot joint dislocation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an oropharyngeal anterior approach occipital-cervical fixation device. Background Technology

[0002] The atlantoaxial joint is located at the craniocervical junction. Congenital malformations or trauma can cause atlanto-occipital joint instability or atlantoaxial joint dislocation. Both atlanto-occipital joint instability and atlantoaxial dislocation can lead to high cervical spinal cord compression, resulting in paralysis or even death. Clinically, patients with atlanto-occipital joint instability or atlantoaxial dislocation are first treated with traction reduction, followed by external fixation or surgical internal fixation.

[0003] For patients who cannot be reduced by traction, oropharyngeal decompression is required, followed by anterior or posterior occipitocervical internal fixation surgery. Anterior surgery involves releasing the fibrous or bony connections between the atlantoaxial joint via the oral cavity and then repositioning and fixing them. Existing transoral anterior fixation plates are mostly straight plates, which are difficult to fully conform to the anterior structures of the atlantoaxial joint and lack self-reduction capabilities, resulting in poor reduction and fixation outcomes.

[0004] Therefore, this utility model provides a transoral anterior approach occipital-cervical fixation device that can improve the fit between the device and the atlas and has the ability to self-lift and reset the screw. Utility Model Content

[0005] The purpose of this invention is to provide an anterior oropharyngeal occipital fixation device, which has a high degree of fit with the atlas and is easy to fix, and can treat atlanto-occipital joint and atlantoaxial joint dislocation.

[0006] This utility model provides an oropharyngeal anterior approach occipitocervical fixation device, including a crossbeam. The upper parts of both ends of the crossbeam are provided with two upper side wings facing each other, and the lower parts of both ends of the crossbeam are provided with two lower side wings facing each other. The crossbeam conforms to the curvature of the surface of the human atlas. The ends of the upper side wings are upturned, and the upturned part conforms to the anatomical shape of the surface of the occipital condyle. The lower side wings conform to the curvature of the surface of the human axis.

[0007] Preferably, both ends of the crossbeam are provided with atlas fixation screw holes, through which atlas fixation screws pass and are fixedly connected to the atlas; the top of each upper wing is provided with occipital condyle fixation screw holes, through which occipital condyle fixation screws pass and are fixedly connected to the occipital condyle; the bottom of the lower wing is provided with axis fixation screw holes, through which axis fixation screws pass and are fixedly connected to the axis.

[0008] Preferably, each of the two atlas fixing screw holes is provided with a first auxiliary screw hole on one side close to each other, and a first compression bolt passes through the first auxiliary screw hole and is threaded to the crossbeam; each of the two pivot fixing screw holes is provided with a second auxiliary screw hole on one side close to the crossbeam, and a second compression bolt passes through the second auxiliary screw hole and is threaded to the lower wing.

[0009] Preferably, the screw heads of the first extrusion bolt and the second extrusion bolt are both arc-shaped, and can abut against adjacent screws after rotation.

[0010] Preferably, the angle between the upper wing and the crossbeam is 90-100°, and the angle between the lower wing and the crossbeam is 70-80°.

[0011] Preferably, a reset plate is provided below the center of the crossbeam, and a reset screw hole is provided on the reset plate. The reset screw passes through the reset screw hole and is fixedly connected to the odontoid process of the axis.

[0012] Preferably, the lower wing, the reset plate, and the crossbeam are all connected by an arc-shaped plate, and the arc-shaped plate is adapted to the step between the atlantoaxial joint.

[0013] Preferably, the thickness of the crossbeam, the upper wing, the lower wing, and the reset plate is 2-3 mm.

[0014] Preferably, the crossbeam, the upper wing, the lower wing, and the reset plate are all made of medical-grade titanium alloy.

[0015] Preferably, the crossbeam, the upper wing, the lower wing, and the reset plate are an integrated structure.

[0016] Beneficial effects: In this invention, the crossbeam conforms to the curvature of the human atlas surface, thereby improving the fit between the crossbeam and the atlas and enhancing the fixation effect; the upper wing can connect with the occipital bone and anatomically fit with the occipital condyle, further strengthening the fixation effect; the lower wing, in conjunction with the reduction plate, can reduce the dislocated axis joint.

[0017] This invention enables the reduction of atlantoaxial joint dislocation and anterior fixation of the atlanto-occipital-axial joint during oropharyngeal release surgery, thus treating atlanto-occipital joint instability and atlantoaxial joint dislocation. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the working structure of this utility model; Figure 2 This is a schematic diagram of the main structure of the present invention with some parts omitted. Figure 3 This is a side view of the structure of this utility model.

[0020] Explanation of reference numerals in the attached figures: 1-Occipital bone, 2-Atlas, 3-Axis, 4-Bridge, 401-Atlas fixation screw, 402-First compression bolt, 403-Atlas fixation screw hole, 404-First auxiliary screw hole, 5-Upper lateral wing, 501-Occipital condyle fixation screw, 502-Occipital condyle fixation screw hole, 6-Lower lateral wing, 601-Axis fixation screw, 602-Second compression bolt, 603-Axis fixation screw hole, 604-Second auxiliary screw hole, 7-Reduction plate, 701-Reduction screw, 702-Reduction screw hole, 8-Arc-shaped plate. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1 like Figure 1-3 As shown, an anterior oropharyngeal occipitocervical fixation device includes a crossbeam 4. Two upper wings 5 ​​are positioned opposite each other at the upper ends of the crossbeam 4, and two lower wings 6 are positioned opposite each other at the lower ends of the crossbeam 4. The crossbeam 4 conforms to the curvature of the surface of the atlas 2. The upper wings 5 ​​are curved upwards at their ends, conforming anatomically to the surface of the occipital condyle. The lower wings 6 conform to the curvature of the surface of the axis 3. A reduction plate 7 is located below the center of the crossbeam 4. The reduction plate 7 has reduction screw holes 702, through which reduction screws 701 are fixedly connected to the odontoid process of the axis 3. The lower wings 6, the reduction plate 7, and the crossbeam 4 are all connected by arc-shaped plates 8, which are adapted to the step between the atlas and axis 3.

[0025] The angle between the upper wing 5 and the crossbeam 4 is 90-100°, preferably 90°, and the angle between the lower wing 6 and the crossbeam 4 is 70-80°. These angles are compatible with the structure of the human occipital bone, atlas 2, and axis 3. The edges of the crossbeam 4, upper wing 5, lower wing 6, and repositioning plate 7 are all rounded to avoid scratching damage to surrounding soft tissues, blood vessels, and nerves during surgical implantation, thus reducing surgical risks. Simultaneously, the smooth transitions at the connection points of each component enhance the stability of the overall structure, reduce stress concentration points, and prevent breakage during long-term use.

[0026] Both ends of the crossbeam 4 are provided with compression-type atlas fixation screw holes 403, through which atlas fixation screws 401 pass and are fixedly connected to atlas 2; the top of the upper wing 5 is provided with occipital condyle fixation screw holes 502, through which occipital condyle fixation screws 501 pass and are fixedly connected to the occipital condyle; the bottom of the lower wing 6 is provided with axis fixation screw holes 603, through which axis fixation screws 601 pass and are fixedly connected to axis 3. The lengths of the atlas fixation screws 401, occipital condyle fixation screws 501, axis fixation screws 601, and reduction screws 701 are 15-21 mm.

[0027] Each of the two atlas fixing screw holes 403 has a first auxiliary screw hole 404 on the crossbeam 4 located close to each other. The first compression bolt 402 passes through the first auxiliary screw hole 404 and is threaded to the crossbeam 4. Each of the two pivot fixing screw holes 603 has a second auxiliary screw hole 604 on the lower wing 5 located close to the crossbeam 4. The second compression bolt 602 passes through the second auxiliary screw hole 604 and is threaded to the lower wing 5. The screw heads of the first compression bolt 402 and the second compression bolt 602 are both arc-shaped. After rotation, the screw head can apply a compression action to the screw heads of adjacent screws, thus locking the adjacent screws. The first compression bolt 402 and the atlas fixing screw 401, and the second compression bolt 602 and the pivot fixing screw 601 are paired together to form a compression reinforcement, which can lock the atlas fixing screw 401 and the pivot fixing screw 601 and prevent them from coming out.

[0028] The length of the reset plate 7 is less than the length of the lower wing 6. The thickness of the crossbeam 4, upper wing 5, lower wing 6, and reset plate 7 is 2-3mm. The crossbeam 4, upper wing 5, lower wing 6, and reset plate 7 are an integrated structure and are all made of medical-grade titanium alloy.

[0029] Working principle: The surgery was performed via a transoral approach, exposing the anterior clivus, occipital condyle, anterior arch of atlas 2, lateral mass of atlas 2, and the body of axis 3, as well as the bony structures such as the lateral mass joints on both sides. First, the soft tissue scars were cleared using an electrocautery knife. Then, the atlanto-occipital joint and the atlantoaxial lateral mass joint space were opened with a reamer, the articular cartilage was released and cleared, and after initial reduction, cancellous bone was implanted.

[0030] Next, a suitable-sized transoral anterior occipitocervical fixation device was selected, and the distance between its screw holes was measured to estimate the implantation position. An opening was made anterior to the occipital condyle using a burr, and a screw channel was established using a hand drill. After measuring the depth, an occipital condyle fixation screw 501 of appropriate length was selected to fix the superior lateral wing 5 to the occipital condyle. Similarly, a hole was drilled on the lateral mass of atlas 2 to establish a screw channel, and an atlas fixation screw 401 was implanted for anterior fixation. Fluoroscopy was used to observe the reduction of atlantoaxial 3 dislocation. If dislocation was present, a hole was drilled at the base of the odontoid process of axis 3, and after measuring the depth, a screw of appropriate length was selected as the reduction screw 701 and screwed into the base of the odontoid process of axis 3, using the spiral reduction effect to achieve traction reduction. Finally, holes were drilled corresponding to the axis fixation screw holes 603 on the inferior lateral wing 6 to establish a channel for a retrograde pedicle screw or axis 3 vertebral body screw. After measuring the depth, an axis fixation screw 601 was implanted to complete the fixation.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A transoral anterior cervical fixation device with self-lifting and repositioning function, characterized in that, The device includes a crossbeam, with two upper wings facing each other at the upper ends of the crossbeam and two lower wings facing each other at the lower ends of the crossbeam. The crossbeam conforms to the curvature of the surface of the human atlas. The upper wings are upturned at the ends, and the upturned part conforms to the anatomical shape of the surface of the occipital condyle. The lower wings conform to the curvature of the surface of the human axis. Both ends of the crossbeam are provided with atlas fixation screw holes, through which atlas fixation screws pass and are fixedly connected to the atlas; the top of the upper wing is provided with occipital condyle fixation screw holes, through which occipital condyle fixation screws pass and are fixedly connected to the occipital condyle; the bottom of the lower wing is provided with axis fixation screw holes, through which axis fixation screws pass and are fixedly connected to the axis.

2. The transoral anterior cervical fixation device with self-lifting and repositioning function according to claim 1, characterized in that, Each of the two atlas fixing screw holes is provided with a first auxiliary screw hole on one side close to each other, and a first compression bolt passes through the first auxiliary screw hole and is threaded to the crossbeam; each of the two pivot fixing screw holes is provided with a second auxiliary screw hole on one side close to the crossbeam, and a second compression bolt passes through the second auxiliary screw hole and is threaded to the lower wing.

3. The transoral anterior cervical fixation device with self-lifting and repositioning function according to claim 2, characterized in that, Both the first and second extrusion bolts have a superior arc-shaped screw head, which can be squeezed by rotating the bolt head of the adjacent screw.

4. The transoral anterior approach cervical fixation device according to claim 1, characterized in that, The angle between the upper wing and the crossbeam is 90-100°, and the angle between the lower wing and the crossbeam is 70-80°.

5. The transoral anterior cervical fixation device with self-lifting and repositioning function according to claim 1, characterized in that, A reset plate is provided below the center of the crossbeam. The reset plate has a reset screw hole, and the reset screw passes through the reset screw hole and is fixedly connected to the odontoid process of the axis.

6. The transoral anterior cervical fixation device with self-lifting and repositioning function according to claim 5, characterized in that, The lower wing, the reset plate, and the crossbeam are all connected by an arc-shaped plate, which is adapted to the step between the atlantoaxial joint.

7. The transoral anterior cervical fixation device with self-lifting and repositioning function according to claim 5, characterized in that, The thickness of the crossbeam, the upper wing, the lower wing, and the reset plate is 2-3 mm.

8. The transoral anterior cervical fixation device with self-lifting and repositioning function according to claim 5, characterized in that, The crossbeam, the upper wing, the lower wing, and the reset plate are all made of medical-grade titanium alloy.

9. The transoral anterior cervical fixation device with self-lifting and repositioning function according to claim 5, characterized in that, The crossbeam, the upper wing, the lower wing, and the reset plate are an integrated structure.

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