Auxiliary flexible fixing device for oral cranio-maxillofacial osteotomy

Abstract

The invention provides an auxiliary flexible fixing device for oral cranio-maxillofacial osteotomy, which is mounted on a bed body, pawl rack assemblies are respectively arranged on two sides of the bed body, the pawl rack assemblies are connected with side fixing plates of the bed body through supporting assemblies, and the pawl rack assemblies on two sides are respectively connected with flexible clamp assemblies through guide rail connecting pieces; the flexible clamp assembly comprises a positioning plate, the positioning plate is connected with the guide rail connecting piece through a supporting column and a side plate in sequence, a plurality of pressing columns arranged at intervals are arranged on the positioning plate, second springs are arranged between the ends, away from the positioning plate, of the pressing columns and the side plate, and ball heads are arranged at the ends, exposed out of the positioning plate, of the pressing columns. The supporting assemblies, the pawl rack assemblies and the flexible clamp assemblies which are used in pairs are adopted, the mode of one-time moving positioning and double locking is completed, and due to reverse locking devices of pawls and ratchets, the first locking mode is achieved; the pressing column of the flexible fixing device fits the shape of the skull of the patient, the pressing column is locked, and a second locking mode is achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a flexible fixation device for assisting in oral craniofacial osteotomy. Background Technology

[0002] Oral-craniofacial osteotomy is a crucial procedure for correcting jaw deformities, repairing trauma, or improving facial contours. The patient lies supine on the operating table, and the skull needs to be stabilized. Using rigid fixation devices presents several technical drawbacks: too loose a fixation will not effectively stabilize the skull, while too tight a fixation will cause discomfort. Using fixed, shaped devices presents the following technical drawbacks: because the size and shape of each patient's skull are different, reliable fixation is difficult to achieve, increasing the complexity of the surgical procedure.

[0003] Current craniofacial osteotomy surgeries use rigid structures to fix the skull, causing discomfort to patients. During the procedure, if the skull fixation shifts, it will affect the planned trajectory of the craniofacial osteotomy line, making it difficult to achieve precise alignment between the planned and actual osteotomy line. This impacts the accurate reconstruction of the facial bones and the restoration of normal facial shape and occlusal function.

[0004] Utility model patent CN214771620 U discloses a novel flexible clamp that uses the elasticity and compressibility of a spring to move a pin up and down, thus achieving a flexible structure. Utility model patent CN109986487A discloses a dot-matrix self-mimicking flexible clamp, where one end of the clamping pins on both sides contacts and presses the clamped item, while the other end of the clamping pin presses a compression spring guide post. The compression spring guide post presses the compression spring, causing it to slide within the compression spring guide sleeve. The elastic force of the compression spring provides clamping force to the clamped item. Utility model patent CN210678459U discloses a car headlight bulb contouring flexible clamp. When the driver is released, the support rod can move up and down within the clamping groove. A bulb or other irregular workpiece is placed on the support rod, and the support rod in contact with the bulb surface moves down, maintaining contact through a spring. Once the appropriate position is reached, the driver pushes the clamping plate, and the rubber on the clamping groove presses against the support rod, keeping the support rod in a fixed position. These application embodiments have the following technical defects: the locking block pressure plate or clamping plate and the clamping plate are perpendicular to the axis of the distributed ejector pins or clamping pins and the support rod, and can only rely on springs to lock the ejector pins or clamping pins and the support rod.

[0005] Utility model patent CN213614982U discloses a flexible clamp for holding irregularly shaped aluminum alloy parts. The embodiment in this application mentions that "the compressed spring 42 still produces a slight elastic deformation, therefore it can only be used for welding and assembly of aluminum alloy parts, and cannot be milled." This has the following technical drawback: this slight elastic deformation is not applicable to this invention.

[0006] Utility model patent CN214350925 U discloses a suction-type flexible clamp. In this embodiment, an air inlet 231 is provided to introduce gas into the locking airbag 21, causing the airbag 21 to inflate and clamp the support rod 4 extending into the locking groove 22, thereby fixing the position of the support rod 4 and ensuring stable positioning and fixation of the component. However, this invention has the following technical drawback: it can only be used in application scenarios where a suitable air source is available, and is not applicable to the application scenarios of this invention.

[0007] Utility model patent application CN214686158U discloses a flexible clamping device. In this application embodiment, both the first flexible clamp (100) and the second flexible clamp (300) include a clamping body (110), an axial limiting mechanism (120), and a plurality of telescopic clamping mechanisms (130). The axial limiting mechanism (120) and the telescopic clamping mechanisms (130) are disposed on the clamping body (110); the axial limiting mechanism (120) is arranged perpendicular to the telescopic clamping mechanism (130); the plurality of telescopic clamping mechanisms (130)... The components are closely arranged, the first limiting adjustment member 122 is fed, the telescopic clamping mechanism 130 is pushed, the first elastic member 123 is compressed, and the axial limiting member 121 presses against the telescopic clamping mechanism 130 to limit the movement. The telescopic clamping mechanism 130 includes a clamping member 131, a radial limiting member 132, and a second elastic member 133. The radial limiting member 132 and the second elastic member 133 are sleeved on the clamping member 131, and the second elastic member 133 abuts between the radial limiting member 132 and the clamp body 110. The following technical defects exist: The axial limiting is achieved by the tight arrangement of the clamping parts 131 and the axial limiting mechanism perpendicular to the telescopic clamping mechanism. The tight arrangement leads to a narrow operating space, making it difficult to accurately align or apply sufficient clamping force during installation. During later maintenance or disassembly, the parts may obstruct each other, requiring the removal of surrounding components before operation, increasing labor time and costs, and may even damage the parts due to forced disassembly. The tightly arranged clamping parts lack buffer space. If there are minor dimensional errors (such as machining tolerances or cumulative assembly errors) in the clamped parts or the base structure, the clamping parts will squeeze each other, generating additional pre-tightening stress, which may cause deformation and cracks in the parts in the long term.

[0008] This embodiment of the application also proposes that the second limiting adjustment member 422 and the limiting mechanism sliding member 423 are connected by threads, and several third elastic members 421 abut between the limiting mechanism sliding member 423 and the sliding limiting mechanism body 410. Through threaded feeding, the third elastic members 421 are compressed, and the limiting mechanism sliding member 423 squeezes the slide rail 200, increasing the friction. The limiting mechanism sliding member 423 cannot slide on the slide rail 200. Since the sliding limiting mechanism 400 is connected to the second flexible clamp 300, the second flexible clamp 300 is limited to the slide rail 200. Conversely, the second flexible clamp 300 can slide on the slide rail 200. The following technical defects exist: the second limiting adjustment member and the limiting mechanism sliding member rely on threaded engagement. When tightening or loosening, it is necessary to rotate the tool multiple times to achieve the predetermined preload, which is time-consuming and laborious.

[0009] Utility model patent CN220680794U discloses a flexible clamping mechanism for hardware processing. The flexible clamping mechanism for hardware processing described in this application is characterized by: a first groove (a) adapted to a second clamping plate (92) being provided in the middle of the first clamping plate (91), the first groove (a) dividing the first clamping plate (91) into a first supporting part (911) and a second supporting part (912) that are interconnected, parallel, and symmetrical; a second groove (b) adapted to the first clamping plate (91) being provided on the base (3); and a locking mechanism 9 using the first clamping plate 91, the second clamping plate 92, a limiting hole 93, and a driving mechanism 94, that is, selectively locking the support rod 4 and the base 3 using the inner wall of the limiting hole 93. This application also proposes adjusting the spatial position of the workpiece relative to the worktable through an adjustment mechanism, which is described in the appendix to this specification. Figure 2 As can be seen, a lead screw with a reverse thread controls the spatial position of the worktable. This mechanism has the following technical drawbacks: it is only suitable for selective locking of the support rod 4 and the base 3; the lead screw controls the spatial position of the worktable by converting rotational motion into linear motion through thread engagement, and the lead screw is a "two-way transmission" structure. If unidirectional locking is required (such as preventing reverse movement of components), an additional braking device must be installed, further increasing the system complexity and cost.

[0010] Utility model patent CN211749977U discloses an orthopedic fixation bracket. In this embodiment, the flexible clamp is bow-shaped, with the concave arcs of the bow shape facing each other. A sensor is located at the center of the flexible clamp. The feature is that the flexible clamp has a flexible layer on its inner surface. The flexible clamp 12 is bow-shaped, with the concave arcs of the bow shape facing each other. The patient places the injured limb in the middle of the flexible clamp 12. The sensor 16 on the flexible clamp 12 sends a command to the controller. The controller controls the servo motor 5 to drive the lead screw 4 to rotate and controls the ball bearing slide 6 to move inward. Then, the flexible clamp 12 is extended or shortened by the hydraulic push rod 10, and its shape is adjusted to fit different body parts. However, this design has the following technical drawbacks: the bow-shaped flexible clamp cannot completely conform to the patient's skull; the lead screw is a "two-way transmission" structure, and if one-way locking (such as preventing reverse movement of components) is required, an additional braking device must be installed, further increasing the system complexity and cost.

[0011] Therefore, how to design a flexible fixation device that can accurately fix the patient's skull and avoid the patient feeling discomfort in the skull for oral craniofacial osteotomy has become an urgent problem to be solved. Summary of the Invention

[0012] In view of the problems existing in the prior art, the present invention provides a flexible fixation device for assisting craniofacial osteotomy to solve at least one of the above-mentioned technical problems.

[0013] The technical solution of this invention is: a flexible fixation device for assisting craniofacial osteotomy, installed on a bed, with flexible fixation components respectively provided on both sides of the bed. Each flexible fixation component includes a pawl and rack assembly, which is connected to a side fixing plate of the bed via a support assembly. The pawl and rack assemblies on both sides are respectively connected to a flexible clamp assembly via guide rail connectors. The pawl and rack assembly includes a dual-axis guide rail slider assembly and a pawl. The dual-axis guide rail slider assembly includes a slider mounted on a guide rail, with a ratchet rack connected to the bottom surface of the guide rail. The pawl meshes with the ratchet rack. The pawl is equipped with a reverse locking device; the flexible clamp assembly includes a positioning plate, one side of which is connected to the guide rail connector via a support column and a side plate in sequence. Several pressure columns are arranged at intervals on the end faces of the two positioning plates that are close to each other. A second spring is provided between the end of the pressure column away from the positioning plate and the side plate. A movable plate is provided between the side plate and the positioning plate. Several sealing rings are provided between the movable plate and the positioning plate. A ball head is provided at one end of the pressure column. The ball head passes through the sealing ring and protrudes from the positioning plate. The ball heads on both sides fix the two sides of the patient's skull.

[0014] This invention employs a paired support assembly, a ratchet rack assembly, and a flexible clamp assembly; it achieves a single movement and positioning with dual locking, simplifying operation for medical staff while protecting patients from repeated compression of the skull during skull positioning. During the movement of the flexible fixation device, the ratchet and ratchet rack's reverse locking mechanism provides the first layer of locking. The pressure column of the flexible fixation device conforms to the shape of the patient's skull, and then a movable plate presses the sealing ring parallel to the column's axis, applying force to the column's circumference and locking it, thus achieving the second layer of locking. The flexible fixation device allows the patient to... This design prevents the skull from being compressed by rigid objects during fixation, overcoming the technical shortcomings of existing craniofacial osteotomy procedures that cause discomfort to patients after skull fixation. It simplifies operation for medical staff, enabling rapid skull fixation to achieve the desired surgical outcome. Utilizing a dual-axis guide rail slider assembly with a ratchet rack mounted on the guide rail, the ratchet teeth of the pawl engage with the ratchet rack to control the locking position of the flexible clamp assembly. The ratchet teeth and ratchet rack achieve rapid locking or releasing through mechanical engagement, eliminating the need for repeated rotation and allowing fixation or release within seconds. This makes it suitable for scenarios requiring frequent disassembly and reassembly.

[0015] Preferably, an outer cover is provided between the outer edge of the positioning plate and the outer edge of the side plate; four arrayed eleventh-step holes are provided on the end face of the positioning plate near the movable plate, the large end of the eleventh-step hole is used to position one end of the first spring on the positioning plate; a thirteenth-step hole is provided on the end face of the movable plate near the positioning plate, the small end of the thirteenth-step hole is a through hole that allows the positioning pin to pass through, and the large end of the thirteenth-step hole is used to position the other end of the first spring; the positioning pin passes through the small end of the thirteenth-step hole and the first spring in sequence and then screws into the small end of the eleventh-step hole, restricting the first spring between the positioning plate and the movable plate; a fifteenth screw hole is provided at the center of the side plate, the fifteenth screw hole is connected to the handle, one end of the handle is a fourth stud, the fourth stud is screwed into the fifteenth screw hole, the end of the fourth stud located inside the outer cover is in contact with the center of the movable plate, and the first spring is used to reset the movable plate.

[0016] This invention employs four eleventh-step holes on the positioning plate, with the larger end of each eleventh-step hole used to fix one end of the first spring; and four thirteenth-step holes on the movable plate, with the larger end of each thirteenth-step hole used to fix the other end of the first spring; a positioning pin passes sequentially through the smaller end of the thirteenth-step hole, the first spring, and then connects to the eleventh screw hole, fixing the positioning pin to the positioning plate and confining the first spring between the positioning plate and the movable plate. The first spring is used for the reset of the movable plate; when the handle is rotated clockwise, the handle moves the movable plate towards the spherical head of the pressure column, compressing the first spring; when the handle is rotated counterclockwise, the handle moves the movable plate away from the spherical head of the pressure column, releasing the first spring, and the reset of the first spring causes the movable plate to reset.

[0017] Preferably, the positioning plate is provided with a plurality of spaced pressure column through holes, and the end face of the positioning plate near the movable plate is provided with a plurality of circular grooves corresponding to the pressure column through holes, and a sealing ring is provided in the circular groove; the end face of the movable plate near the positioning plate is provided with a plurality of spaced annular steps, and the movable plate is provided with a plurality of spaced through holes, the through holes corresponding one-to-one with the pressure column through holes, and the through holes communicating with the inner holes of the annular steps; one end of the spherical head of the pressure column passes through the through hole, the sealing ring, and the pressure column through hole in sequence and protrudes from the positioning plate; the other end of the pressure column is provided with a fourteenth step hole, the small end of the fourteenth step hole is connected to the guide post, and the large end of the fourteenth step hole is used for positioning one end of the second spring, the second spring is sleeved on the outer ring of the guide post, and the side plate is provided with a plurality of blind holes, the blind holes corresponding one-to-one with the through holes, and the blind holes are used for positioning the other end of the second spring.

[0018] This invention employs a fourteenth-step hole on the top surface of the large end of the pressure column, the large end of which is used to fix one end of the second spring. Several blind holes are set on the side plate to fix the other end of the second spring. The second spring is located between the blind holes and the large end of the fourteenth-step hole for resetting the pressure column. The spherical end of the pressure column passes through the through hole, the sealing ring, and the pressure column through hole in sequence before protruding from the positioning plate. The sealing ring is pressed by an annular step, with the inner ring of the sealing ring allowing the pressure column to pass through, and the outer ring fixed to the circular groove of the positioning plate. When the movable plate presses down on the sealing ring, the inner ring of the sealing ring is compressed and deformed, and it presses the pressure column tightly, thus locking the pressure column in any position.

[0019] Preferably, the positioning plate has four arrayed twelfth-step holes on the end face near the movable plate, and a support column is installed in the twelfth-step hole. The support column is screwed into the small end of the twelfth-step hole. The movable plate has four clearance grooves, which are arranged one-to-one with the twelfth-step holes. The clearance grooves are used to make way for the support column. The outer edge of the positioning plate near the outer cover has a first annular groove.

[0020] The outer edge of the side plate near the outer cover has a second annular groove; four arrayed fifteenth-step holes are arranged on the side plate near the outer cover, corresponding one-to-one with the twelfth-step holes; the larger end of the fifteenth-step hole is used for positioning the support column, and the smaller end of the fifteenth-step hole is a second through hole; countersunk holes are arranged at intervals on the side plate away from the outer cover, two countersunk holes are away from the guide rail connector, and two countersunk holes are arranged corresponding to the second through hole, countersunk screws are installed in the countersunk holes, and the two countersunk screws pass through the second through hole to connect the support column; sixteenth screw holes are arranged at intervals on the side plate.

[0021] The vertical plate end face of the guide rail connector is provided with tenth step holes distributed at the four corner points of the isosceles trapezoid. Tenth bolts are installed in the tenth step holes. Two tenth bolts pass through the tenth step holes at the two corner points of the upper base of the isosceles trapezoid and connect to the sixteenth screw hole. The other two tenth bolts pass through the tenth step holes and the second through hole at the two corner points of the lower base of the isosceles trapezoid in sequence and connect to the support column.

[0022] This invention uses the first annular groove on the positioning plate and the second annular groove on the side plate to position the two ends of the outer cover; the large end of the fifteenth step hole is used for positioning the support column; two countersunk screws pass through the second through hole at the small end of the fifteenth step hole to connect to the fourteenth screw hole, fixing the side plate away from the guide rail connector to the support column; two tenth bolts in the tenth step holes pass through the second through hole at the small end of the fifteenth step hole to connect to the fourteenth screw hole, fixing the guide rail connector to the side plate and the support column; and two more tenth bolts in the tenth step holes connect to the sixteenth screw hole, fixing the guide rail connector to the side plate.

[0023] Preferably, the support assembly includes parallel support rods, a connecting rod is provided between the upper parts of two support rods, and the lower part of any one support rod is connected to the side fixing plate of the bed through a medical clamp.

[0024] The support rod is arranged vertically. The upper end of the support rod is cylindrical and the lower end is flat. A rectangular opening slot and a first step hole are provided on the end face of the two cylindrical ends that are close to each other. The large end of the first step hole is at 180° with the rectangular opening slot, and the small end of the first step hole is connected to the bottom plane of the rectangular opening slot. A first bolt is provided in the first step hole.

[0025] The connecting rod is a first cuboid arranged horizontally. The two ends of the first cuboid are respectively located in the corresponding rectangular opening slots. The two end faces of the first cuboid are provided with first screw holes arranged at intervals. The first bolts are screwed into the corresponding first screw holes to connect the support rod and the connecting rod into one unit.

[0026] The present invention employs a rectangular opening groove provided on the end faces of the cylindrical ends of the two support rods that are close to each other. The bottom plane of the rectangular opening groove is used to position it with the end face of the first cuboid. The support rod and the connecting rod are connected as one unit by the first bolts in the two first step holes.

[0027] Preferably, a first groove is provided in the middle of the top surface of the connecting rod, and a second stepped hole is provided in the first groove at intervals. The small end of the second stepped hole communicates with the top surface of the first groove, and a second bolt is provided in the second stepped hole; the second bolt connects to the pawl rack assembly.

[0028] The present invention uses a first slot in the middle of the top surface of the connecting rod to position the pawl rack assembly, and fixes the pawl rack assembly to the connecting rod by the second bolts in the two second step holes.

[0029] Preferably, the medical clamp includes a medical fixation clamp, which is a horizontally placed U-shaped structure. The opening of the U-shaped structure is connected to the side fixing plate of the bed. A first rectangular through hole is provided on the straight plate of the U-shaped structure, and the flat end is located in the first rectangular through hole. A second slot is provided on the inner side of both straight plates of the U-shaped structure, and the second slot is connected to the side fixing plate of the bed.

[0030] This invention employs a medical fixation forceps with a horizontal U-shaped structure. A second slot is provided on the inner side of each of the two straight plates of the U-shaped structure. The second slot is used to horizontally connect to the side fixing plates of the bed. A first rectangular through-hole is provided on each straight plate of the U-shaped structure. The flat end of the support rod is inserted into the first rectangular through-hole of the medical fixation forceps. The first rectangular through-hole has a certain gap, allowing the flat end of the support rod to slide within it.

[0031] Preferably, a fourth mechanical interface is provided on the arc-shaped bottom surface of the U-shaped structure. The fourth mechanical interface is a second screw hole, and a knob is provided in the second screw hole. One end of the knob is a gripper part, and the other end is a screw rod. A third screw hole is provided at the end of the screw rod. The screw rod of the knob is connected to the pressure block. The pressure block is a cylinder. A third stepped hole is provided on one end face of the cylinder. A third bolt is provided in the third stepped hole, and the third bolt is screwed into the third screw hole.

[0032] The present invention uses a knob to fix the support assembly to the fixing plate on the side of the bed. The flat end has a certain length for adjusting the height of the support assembly. The pressure block and the screw end of the knob are connected as one unit by the third bolt in the third step hole. The knob presses the flat end and the side fixing plate of the bed through the pressure block to fix the support assembly to the side fixing plate of the bed.

[0033] Preferably, the pawl rack assembly includes a pawl fixing seat, which is an F-shaped structure. A first mounting groove is provided within the opening of the F-shaped structure. A dual-axis guide rail slider assembly is provided within the first mounting groove. The two ends of the guide rail of the dual-axis guide rail slider assembly are respectively connected to a slide rail end cap and a guide rail connector. Four arrayed fourth-step holes are provided on the top surface of the long side of the F-shaped structure. A fourth bolt is provided within each fourth-step hole and connected to the slider. An H-shaped structure is provided below the short side of the F-shaped structure. A second mounting groove is provided within the upper opening of the H-shaped structure. A pawl central shaft and a pawl are provided within the second mounting groove 2013. The corresponding part of the lower vertical plate of the F-shaped structure and the second mounting groove... The structure is provided with a fifth step hole and a fourth screw hole in sequence. A fifth bolt is installed in the fifth step hole, and the fifth bolt connects to the pull block. One side of the second mounting groove is a sloping groove. The upper end face of the H-shaped structure away from the F-shaped structure is provided with spaced fifth screw holes and spaced first pin holes. The upper horizontal plate end face of the F-shaped structure is provided with two fifth screw holes. The two fifth screw holes on the upper horizontal plate end face and the two fifth screw holes on the upper end face of the H-shaped structure are distributed at the four corners of the rectangle. The four fifth screw holes are used to connect the ratchet cover plate. The lower opening of the H-shaped structure is a third mounting groove. The bottom plane of the third mounting groove is provided with spaced sixth screw holes. The second bolt is screwed into the sixth screw hole.

[0034] The present invention uses the second bolts in the two second-step holes to connect with the sixth screw hole to fix the pawl rack assembly to the connecting rod; and uses the fifth bolt in the fifth-step hole to fix the pawl fixing seat to the pawl fixing seat.

[0035] Preferably, the pawl central shaft is provided with a first stud, a first shaft segment, and a second shaft segment sequentially from one end to the other. The diameters of the first stud and the second shaft segment are both smaller than the diameter of the first shaft segment. A pawl is installed on the second shaft segment. The first stud is connected to a fourth threaded hole. An annular groove is provided on the outer ring of the end of the second shaft segment away from the first shaft segment. The annular groove is used for the installation of the E-type retaining ring. An opening groove is provided at the center of the end face of the second shaft segment away from the first shaft segment.

[0036] One end of the pawl is provided with a first ratchet tooth, and the other end of the pawl is provided with a fixing hole. The second shaft section of the pawl's central shaft is installed in the fixing hole. The pawl is also provided with a mounting hole for fixing the small end of the tower spring. The mounting hole and the fixing hole are arranged at right angles. The tower spring has a structure with one end larger than the other. The large end of the tower spring is stuck in the inclined groove of the pawl fixing seat.

[0037] The reverse locking device includes a lever, which includes a first stepped shaft. The small end of the first stepped shaft is an irregular shaft section with a triangular cross-section. The apex arc and base arc of the triangle are circular with the outer cylindrical surface of the large end of the first stepped shaft. A seventh screw hole is provided on the end face of the small end of the first stepped shaft, and a fifth bolt is connected to the seventh screw hole.

[0038] The ratchet cover plate is a rectangular block with four arrayed eighth step holes and spaced second pin holes. The second pin holes correspond to the first pin holes, and a pin is installed in the second pin hole. The eighth step holes are located at the four corners of the rectangular block, and an eighth bolt is installed in the eighth step hole. The eighth bolt is screwed into the fifth screw hole. Rectangular bosses are provided on the lower part of both end faces of the ratchet cover plate. One rectangular boss has a spaced step. The center of the other rectangular boss has a V-groove with a central hole in the opening of the V-groove. The large end of the first step shaft passes through the central hole and connects to the irregular hand lever. The irregular hand lever mates with the V-groove.

[0039] This invention employs a pawl mounted on a second shaft segment, allowing the pawl to rotate around the second shaft segment. The pawl is axially limited by the first shaft segments at both ends and an E-type retaining ring. An open slot is provided on the pawl's central shaft for easy installation using a flathead screwdriver onto the pawl mounting base. The first stud of the pawl's central shaft connects to the fourth threaded hole, securing the pawl's central shaft to the pawl mounting base. The mounting hole of the pawl connects to the small end of a tower spring, and the ramped groove of the pawl mounting base connects to the large end of the tower spring, connecting the pawl and the pawl mounting base via the tower spring, which controls the reset and locking of the pawl and ratchet rack. A fifth bolt in the fifth stepped hole connects to the seventh threaded hole of the lever, securing the lever to the pawl mounting base. A non-circular shaft segment with a triangular cross-section at both ends is used for the pawl and... The ratchet rack is positioned for engagement; the first stepped shaft is used when the pawl and ratchet rack are not engaged. The shaped shaft section rotates to a cylindrical surface cocircular with the outer cylindrical surface of the large end of the first stepped shaft. This cylindrical surface mates with the side of the pawl, pushing the pawl out of the ratchet rack; a pin connects the second pin hole and the first pin hole for precise positioning of the pawl mounting base and pawl cover; the eighth bolts in the four eighth-step holes connect with the fifth screw hole to fix the pawl cover to the pawl mounting base; the center hole is used for positioning the large end of the first stepped shaft; the shaped hand lever mates with the V-groove. The first function of the shaped hand lever is to control the engagement of the pawl and ratchet rack by manually driving the first stepped shaft; the second function is to control the opening and engagement of the pawl by mates with the V-groove on the side of the shaped hand lever, and to provide a reverse locking device for the pawl. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the installation structure of the present invention.

[0041] Figure 2 This is an exploded view of the support component installation structure of the present invention.

[0042] Figure 3 This is an exploded view of the mounting structure of the dual-axis guide rail slider assembly of the present invention.

[0043] Figure 4This is an exploded view of the mounting structure of the ratchet fixing seat and the dual-axis guide rail slider assembly of the present invention.

[0044] Figure 5 for Figure 4 Rear view.

[0045] Figure 6 This is an exploded view of the ratchet fixing seat and ratchet cover plate mounting structure of the present invention.

[0046] Figure 7 This is an exploded view of the flexible clamp assembly mounting structure of the present invention.

[0047] Figure 8 This is an exploded view of the mounting structure of the positioning plate and the movable plate of the present invention.

[0048] Figure 9 This is an exploded view of the mounting structure of the pressure column, the first spring, and the guide column of the present invention.

[0049] Figure 10 This is a top-view three-dimensional view of the support rod of the present invention.

[0050] Figure 11 This is a three-dimensional view of the support rod of the present invention from a bottom angle.

[0051] Figure 12 This is a top-view three-dimensional view of the connecting rod of the present invention.

[0052] Figure 13 This is a three-dimensional view of the connecting rod of the present invention from a bottom angle.

[0053] Figure 14 This is an exploded view of the medical clamp mounting structure of the present invention.

[0054] Figure 15 This is a three-dimensional view of the knob of the present invention.

[0055] Figure 16 This is a three-dimensional view of the pressing block of the present invention.

[0056] Figure 17 This is a top three-dimensional view of the ratchet pawl fixing seat of the present invention.

[0057] Figure 18 This is a three-dimensional view of the ratchet pawl fixing seat of the present invention, viewed from below.

[0058] Figure 19 This is a three-dimensional view of the central axis of the pawl in this invention.

[0059] Figure 20 This is a three-dimensional view of the ratchet of the present invention.

[0060] Figure 21 This is a three-dimensional view of the dial block of the present invention.

[0061] Figure 22This is a top-view three-dimensional view of the dual-axis guide rail slider assembly of the present invention.

[0062] Figure 23 This is a three-dimensional view of the dual-axis guide rail slider assembly of the present invention, viewed from below.

[0063] Figure 24 This is a three-dimensional view of the ratchet rack of the present invention.

[0064] Figure 25 This is a three-dimensional view of the slide rail end cap of the present invention.

[0065] Figure 26 This is a front three-dimensional view of the ratchet cover plate of the present invention.

[0066] Figure 27 This is a rear three-dimensional view of the ratchet cover plate of the present invention.

[0067] Figure 28 This is a three-dimensional view of the guide rail connector of the present invention.

[0068] Figure 29 This is a three-dimensional view of the positioning plate of the present invention.

[0069] Figure 30 This is a three-dimensional view of the movable plate of the present invention.

[0070] Figure 31 This is a three-dimensional view of the positioning pin of the present invention.

[0071] Figure 32 This is a three-dimensional left-side view of the pressure column of the present invention.

[0072] Figure 33 This is a three-dimensional view of the pressure column of the present invention from the right side.

[0073] Figure 34 This is a three-dimensional view of the guide post of the present invention.

[0074] Figure 35 This is a three-dimensional view of the support column of the present invention.

[0075] Figure 36 This is a top-view three-dimensional view of the side panel of the present invention.

[0076] Figure 37 This is a three-dimensional view of the side panel of the present invention from below.

[0077] Figure 38 This is a three-dimensional view of the outer casing of the present invention.

[0078] Figure 39 This is a three-dimensional view of the handle of the present invention.

[0079] In the diagram: 1. Support assembly; 2. Pawl and rack assembly; 3. Flexible clamp assembly; 4. Bed; 5. Knob; 6. Pressure block; 101. Support rod; 102. Connecting rod; 103. Medical clamp; 201. Pawl fixing seat; 202. Pawl central shaft; 203. E-type circlip; 204. Tower spring; 205. Pawl; 206. Pulley block; 207. Dual-axis guide rail slider assembly; 208. Pawl rack; 209. Slide rail end cap; 210. Pawl cover plate; 301. Guide rail connector; 302. Positioning plate; 303. Sealing ring; 304. Movable plate; 305. Positioning pin; 306. Pressure column; 307. First spring; 308. Guide column; 309. Second spring; 310. Support column; 311. Side plate; 3 12. Outer cover; 313. Handle; 1011. Cylindrical end; 1012. Flat end; 1013. Rectangular opening slot; 1014. First stepped hole; 1021. First screw hole; 1022. First groove; 1023. Second stepped hole; 1031. Medical fixation forceps; 1032. First rectangular through hole; 1033. Second screw hole; 1034. Second groove; 1035. Third screw hole; 1036. Third stepped hole; 2011. First mounting groove; 2012. Fourth stepped hole; 2013. Second mounting groove; 2014. Fifth stepped hole; 2015. Fourth screw hole; 2016. Sloping groove; 2017. Fifth screw hole; 2018. First pin hole; 2019. Third mounting groove; 2020. Six screw holes; 2021. First stud; 2022. First shaft segment; 2023. Second shaft segment; 2024. Annular groove; 2025. Opening groove; 2051. First ratchet; 2052. Fixing hole; 2053. Mounting hole; 2061. Seventh screw hole; 2062. Irregular shaft segment; 2063. First stepped shaft; 2064. Irregular hand lever; 2071. Slider; 2072. Sixth stepped hole; 2073. Eighth screw hole; 2074. Ninth screw hole; 2081. Second ratchet; 2082. Tenth screw hole; 2091. Seventh stepped hole; 2101. Eighth stepped hole; 2102. Second pin hole; 2103. Step; 2104. Center hole; 2105. V-groove; 3011. Ninth stepped hole; 3012. Tenth-step hole; 3021. Pressure post through hole; 3022. Circular groove; 3023. Eleventh-step hole; 3024. Eleventh threaded hole; 3025. Twelfth-step hole; 3026. Twelfth threaded hole; 3027. First annular groove; 3041. Through hole; 3042. Annular step; 3043. Thirteenth-step hole; 3044. Relief groove; 3051. Threaded section; 3052. Third shaft section; 3053. Fourth shaft section; 3054. First plane; 3061. Fifth shaft section; 3062. Ball head; 3063. Sixth shaft section; 3064. Fourteenth-step hole; 3065. Thirteenth threaded hole; 3081. Second stud; 3082. Seventh shaft section; 3083. Second plane; 3101.3102. Third stud; 3103. Eighth shaft segment; 3104. Fourteenth threaded hole; 3105. Third plane; 3116. Blind hole; 3117. Second annular groove; 3118. Fifteenth stepped hole; 3119. ...

[0080] Two through holes; 3115. Countersunk hole; 3116. Fifteenth screw hole; 3117. Sixteenth screw hole; 3121. Square tube; 3131. Fourth stud; 3132. Irregular handle part. Detailed Implementation

[0081] The present invention will now be further described with reference to the accompanying drawings.

[0082] See Figure 1-39 The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0083] Example 1: A flexible fixation device for assisting craniofacial osteotomy, installed on a bed 4, with elongated side fixation plates on both sides of the bed 4, as shown in the reference. Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 , Figure 32The bed frame 4 is a purchased finished product and will not be described separately. Flexible fixing components are respectively provided on both sides of the bed frame 4. Each flexible fixing component includes a pawl and rack assembly 2, which is connected to the side fixing plate of the bed frame 4 via a support assembly 1. The pawl and rack assemblies 2 on both sides are respectively connected to the flexible clamp assembly 3 via guide rail connectors 301. The pawl and rack assembly 2 includes a dual-axis guide rail slider assembly and a pawl 205. The dual-axis guide rail slider assembly 207 includes a slider 2071 mounted on the guide rail. The bottom surface of the guide rail is connected to a ratchet rack 208, and the pawl 205 engages with the ratchet rack 208. A reverse locking device is provided on the pawl 205. The flexible clamp assembly 3 includes a positioning plate 30. 2. One side of the positioning plate 302 is connected to the guide rail connector 301 via a support column 310 and a side plate 311 in sequence. An outer cover 312 is provided between the outer edge of the positioning plate 302 and the outer edge of the side plate 311. Several pressure columns 306 are arranged at intervals on the end faces of the positioning plates 302 that are close to each other. A second spring 309 is provided between the end of the pressure column 306 inside the outer cover 312 (i.e., the end of the pressure column 306 away from the positioning plate 302) and the side plate 311. A ball head 3062 is provided on the end of the pressure column 306 that protrudes from the positioning plate 302. The ball heads 3062 on both sides fix the two sides of the patient's skull, which facilitates the fixation of the left and right sides of the patient's skull. This invention employs a paired support assembly, a ratchet rack assembly, and a flexible clamp assembly to achieve a single movement and positioning with dual locking. This simplifies operation for medical personnel and prevents patients from experiencing skull compression during skull positioning due to repeated fixation. During the movement of the flexible fixation device, the ratchet and ratchet rack's reverse locking mechanism provides the first layer of locking. The pressure column of the flexible fixation device conforms to the shape of the patient's skull, and then a movable plate presses the sealing ring parallel to the column's axis, applying force to the column's circumference and locking it, thus providing the second layer of locking. This flexible fixation device prevents patients from experiencing skull fixation... Regarding the issue of external pressure from rigid objects, this solution addresses the technical shortcomings of existing craniofacial osteotomy procedures that cause discomfort to patients after skull fixation. It simplifies operation for medical staff, enabling rapid skull fixation to achieve the desired surgical outcome, and is suitable for applications where an air supply is unavailable. Utilizing a dual-axis guide rail slider assembly with a ratchet rack mounted on the guide rail, the ratchet teeth of the pawl engage with the ratchet rack to control the locking position of the flexible clamp assembly. The ratchet teeth and ratchet rack achieve rapid locking or releasing through mechanical engagement, eliminating the need for repeated rotation and allowing fixation or release within seconds, making it suitable for scenarios requiring frequent disassembly and assembly.

[0084] Example 2: Based on Example 1, with reference to... Figure 2The support assembly 1 includes parallel support rods 101, a connecting rod 102 is provided between the upper parts of the two support rods 101, and the lower part of any one support rod 101 is connected to the side fixing plate of the bed 4 through a medical clamp 103.

[0085] refer to Figure 10 , Figure 11 The support rod 101 is arranged vertically. The upper end of the support rod 101 is a cylindrical end 1011 and the lower end is a flat end 1012. A first mechanical interface is provided on the end face of the two cylindrical ends 1011 that are close to each other. The first mechanical interface includes a rectangular opening slot 1013 and first stepped holes 1014 arranged at intervals. The large end of the first stepped hole 1014 is at 180° with the rectangular opening slot 1013, and the small end of the first stepped hole 1014 is connected to the bottom plane of the rectangular opening slot 1013. A first bolt is provided in the first stepped hole 1014.

[0086] refer to Figure 12 The connecting rod 102 is a first cuboid arranged laterally. Both ends of the first cuboid are located within corresponding rectangular opening slots 1013. The bottom plane of the rectangular opening slots 1013 is used for positioning with the end face of the first cuboid. Second mechanical interfaces are provided on both end faces of the first cuboid. The second mechanical interfaces are first screw holes 1021 arranged at intervals. First bolts are screwed into the corresponding first screw holes 1021 to connect the support rod 101 and the connecting rod 102 into one unit. This invention uses rectangular opening slots on the cylindrical ends of the two support rods that are close to each other. The bottom plane of the rectangular opening slots is used for positioning with the end face of the first cuboid. The support rod and the connecting rod are connected into one unit by first bolts in two first stepped holes.

[0087] refer to Figure 12 , Figure 13 A first slot 1022 is provided in the middle of the top surface of the connecting rod 102. A third mechanical interface is provided on the first slot 1022. The third mechanical interface includes second stepped holes 1023 arranged at intervals. The small end of the second stepped holes 1023 communicates with the top surface of the first slot 1022. A second bolt is provided in the second stepped holes 1023. The second bolt connects to the pawl rack assembly 2. In this invention, the first slot in the middle of the top surface of the connecting rod is used to position the pawl rack assembly, and the pawl rack assembly is fixed to the connecting rod by the second bolts in the two second stepped holes.

[0088] Example 3: Based on Example 2, with reference to... Figure 14The medical clamp 103 includes a medical fixation clamp 1031, which is a horizontally placed U-shaped structure. The opening of the U-shaped structure connects to the side fixing plate of the bed 4. A first rectangular through hole 1032 is provided on the straight plate of the U-shaped structure, and the flat end 1012 is located in the first rectangular through hole 1032. A second slot 1034 is provided on the inner side of each of the two straight plates of the U-shaped structure, and the second slot 1034 connects to the side fixing plate of the bed 4. This invention uses a horizontally placed U-shaped medical fixation clamp, with a second slot on the inner side of each of the two straight plates of the U-shaped structure. The second slot is used to horizontally connect to the side fixing plate of the bed. A first rectangular through hole is provided on the straight plate of the U-shaped structure, and the flat end of the support rod is used to insert into the first rectangular through hole of the medical fixation clamp. The first rectangular through hole has a certain gap, allowing the flat end of the support rod to slide within the first rectangular through hole.

[0089] The U-shaped structure has a fourth mechanical interface at the center of its arc-shaped bottom surface. The fourth mechanical interface is a second screw hole 1033. A knob 5 is installed inside the second screw hole 1033. The screw of the knob 5 is connected to the pressure block 6.

[0090] refer to Figure 15 , Figure 16 One end of the knob 5 is a gripper made of polymer materials such as POM or PA, used for hand gripping and rotating the knob; the other end of the knob 5 is a screw, with a fifth mechanical interface at the end of the screw, which is a third screw hole 1035; the pressure block 6 is a cylinder, with a sixth mechanical interface on one end face of the cylinder, which is a third stepped hole 1036. A third bolt is installed in the third stepped hole 1035, and the third bolt engages with the third screw hole 1035 to fix the pressure block 6 to the knob 5. This invention uses a knob to fix the support assembly to a fixed plate on the side of the bed. The flat end has a certain length for adjusting the height of the support assembly; the third bolt in the third stepped hole connects the pressure block and the screw end of the knob into one unit. The knob, through the pressure block, presses the flat end and the side fixed plate of the bed, fixing the support assembly to the side fixed plate of the bed.

[0091] Example 4: Based on Example 2, with reference to... Figure 4 , Figure 6 , Figure 17 , Figure 18The pawl rack assembly 2 includes a pawl fixing seat 201, which is an F-shaped structure. A first mounting groove 2011 is provided within the opening of the F-shaped structure, and a dual-axis guide rail slider assembly 207 is disposed within the first mounting groove 2011. Four arrayed fourth step holes 2012 are provided on the top surface of the long side of the F-shaped structure, and a fourth bolt is disposed within each fourth step hole 2012, connecting to the slider 2071. An H-shaped structure is provided below the short side of the F-shaped structure, and a second mounting groove 2013 is provided within the upper opening of the H-shaped structure. A pawl central shaft 202 and a pawl 205 are disposed within the second mounting groove 2013. A seventh mechanical interface and an eighth mechanical interface are sequentially provided from top to bottom on the corresponding parts of the lower vertical plate of the F-shaped structure and the second mounting groove 2013. The seventh mechanical interface is a fifth step hole 2014, and the eighth mechanical interface is a fourth screw hole 2015. A fifth bolt is installed in the stepped hole 2014, and the fifth bolt connects to the lever block 206; one side of the second mounting groove 2013 is a ramp groove 2016; a ninth mechanical interface is provided on the upper end face of the H-shaped structure away from the F-shaped structure, the ninth mechanical interface including the fifth screw holes 2017 spaced apart and the first pin holes 2018 spaced apart; two fifth screw holes 2017 are provided on the end face of the upper horizontal plate of the F-shaped structure, the two fifth screw holes 2017 on the end face of the upper horizontal plate and the two fifth screw holes 2017 on the upper end face of the H-shaped structure are distributed at the four corners of the rectangle, and the four fifth screw holes 2017 are used to install the ratchet cover plate 210; the lower opening of the H-shaped structure is a third mounting groove 2019, and a tenth mechanical interface is provided on the bottom plane of the third mounting groove 2019, the tenth mechanical interface being the sixth screw holes 2020 spaced apart, and the second bolt is screwed into the sixth screw hole 2020. The present invention uses the second bolts in the two second-step holes to connect with the sixth screw hole to fix the pawl rack assembly and the connecting rod.

[0092] refer to Figure 19The pawl central shaft 202 is provided with a first stud 2021, a first shaft section 2022, and a second shaft section 2023 sequentially from one end to the other. The diameters of the first stud 2021 and the second shaft section 2023 are both smaller than the diameter of the first shaft section 2022. A pawl 205 is installed on the second shaft section 2023. The first stud 2021 is connected to a fourth screw hole 2015. An annular groove 2024 is provided on the outer ring of the end of the second shaft section 2023 away from the first shaft section 2022. The annular groove 2024 is used for the installation of an E-type snap ring 203, which conforms to the provisions of GB / T 896-2020. An open groove 2025 is provided at the center of the end face of the second shaft section 2023 away from the first shaft section. This invention employs a pawl mounted on a second shaft segment, which can rotate around the second shaft segment. The pawl is axially limited by the first shaft segments at both ends of the pawl and the E-type retaining ring. An open slot is provided on the central shaft of the pawl to facilitate the installation of the central shaft of the pawl onto the pawl fixing seat using a flathead screwdriver. The first stud of the central shaft of the pawl is connected to the fourth screw hole to fix the central shaft of the pawl to the pawl fixing seat.

[0093] refer to Figure 5 , Figure 20 The pawl 205 has a first ratchet 2051 at one end and a fixing hole 2052 at the other end. The second shaft segment 2023 of the pawl's central shaft 202 is installed in the fixing hole 2052. The pawl 205 also has a mounting hole 2053 for fixing the small end of the tower spring 204. The mounting hole 2053 is arranged at a right angle to the fixing hole 2052. The tower spring 204 has a structure with one large end and one small end, and conforms to the specifications of GB / T30817-2014. The large end of the tower spring 204 is engaged in the inclined groove 2016 of the pawl fixing seat 201. In this invention, the mounting hole of the pawl connects to the small end of the tower spring, and the inclined groove of the pawl fixing seat connects to the large end of the tower spring. The tower spring connects the pawl and the pawl fixing seat, and controls the reset and locking of the pawl and the ratchet rack.

[0094] refer to Figure 21The reverse locking device includes a lever 206, which includes a first stepped shaft 2063. The small end of the first stepped shaft 2063 is a non-circular shaft section 2062. The cross-section of the non-circular shaft section 2062 is triangular. The apex arc and the base arc of the triangle are concentric with the outer cylindrical surface of the large end of the first stepped shaft 2063. An eleventh mechanical interface is provided on the end face of the small end of the first stepped shaft 2063. The eleventh mechanical interface is a seventh screw hole 2061, and a fifth bolt connects to the seventh screw hole 2061. The large end of the first stepped shaft 2063 is connected to a non-circular hand lever 2064. This invention uses the fifth bolt in the fifth step hole to connect with the seventh screw hole of the pawl, fixing the pawl to the pawl fixing seat; it uses a special-shaped shaft section with a triangular cross-section at the large and small ends, the inclined surfaces of the large and small ends of the triangle are used for limiting the pawl when it engages with the ratchet rack; the first step shaft is used when the pawl does not need to engage with the ratchet rack, the special-shaped shaft section is rotated to a cylindrical surface that is cocircular with the outer cylindrical surface of the large end of the first step shaft, the cylindrical surface of which mates with the side of the pawl, pushing the pawl out of the ratchet rack.

[0095] refer to Figure 22 , Figure 23 The top surface of the slider 2071 of the dual-axis guide rail slider assembly 207 is provided with four arrayed seventeenth screw holes, and the fourth bolt is screwed into the seventeenth screw holes. Several spaced twelfth mechanical interfaces are provided on the bottom of the guide rail groove. The twelfth mechanical interface is a sixth step hole 2072, and a sixth bolt is installed in the sixth step hole 2072, connecting to the ratchet rack 208. One end of the bottom surface of the guide rail has a spaced thirteenth mechanical interface, which is an eighth screw hole 2073. The other end of the bottom surface of the guide rail has four arrayed fourteenth mechanical interfaces, which are ninth screw holes 2074. The two ends of the guide rail of the dual-axis guide rail slider assembly 207 are respectively connected to the slide rail end cap 209 and the guide rail connector 301. This invention uses the fourth bolts in the four fourth step holes to connect to the seventeenth screw holes, fixing the ratchet fixing seat to the slider of the dual-axis guide rail slider assembly.

[0096] refer to Figure 3 , Figure 24 The ratchet rack 208 is a second cuboid, with a second ratchet 2081 on its bottom surface. A first ratchet 2051 engages with the second ratchet 2081. The top surface of the second cuboid has several spaced fifteenth mechanical interfaces, each a tenth screw hole 2082, into which a sixth bolt screws are screwed. This invention uses the connection between the sixth bolts in several sixth-step holes and the eleventh screw holes to fix the guide rail to the ratchet rack.

[0097] refer to Figure 25The slide rail end cap 209 has a first L-shaped structure. The horizontal plate of the first L-shaped structure has sixteenth mechanical interfaces arranged at intervals. The sixteenth mechanical interface is a seventh stepped hole 2091, in which a seventh bolt is installed. The seventh bolt engages with an eighth screw hole 2073. The end face of the vertical plate of the first L-shaped structure is in contact with the end face of the guide rail. This invention uses the seventh bolts in two seventh stepped holes connected to the eighth screw hole to fix one end of the guide rail to the slide rail end cap. The end face of the vertical plate of the slide rail end cap is in contact with the end face of the guide rail for limiting the slider in the dual-axis guide rail slider assembly.

[0098] refer to Figure 26 , Figure 27 The pawl cover plate 210 is a rectangular block with a seventeenth mechanical interface. The seventeenth mechanical interface includes four arrayed eighth step holes 2101 and spaced second pin holes 2102. The four eighth step holes 2101 are located at the four corners of the rectangular block, and eighth bolts are installed within each eighth step hole 2101. These eighteenth bolts secure the pawl cover plate 210 to the pawl fixing seat 201. The second pin holes 2102 correspond to the first pin holes 2018. 2. A pin is provided inside; both sides of the ratchet cover plate 210 are provided with rectangular bosses at the bottom. One rectangular boss is provided with rectangular steps 2103 arranged at intervals; the center of the other rectangular boss is provided with a V-groove 2105. A central hole 2104 is provided in the opening of the V-groove 2105. The first step shaft 2063 of the lever block 206 passes through the central hole 2104. The central hole 2104 is used for positioning the large end of the first step shaft 2063. The irregular hand lever block 2064 cooperates with the V-groove. This invention employs a pin shaft connecting a second pin hole and a corresponding first pin hole to precisely position the pawl fixing seat and pawl cover plate; four eighth bolts in the eighth step holes are connected to the fifth screw holes to fix the pawl cover plate and pawl fixing seat; the center hole is used for positioning the large end of the first step shaft; a special-shaped hand lever engages with a V-groove, the first function of which is to control the engagement of the pawl and the ratchet rack by manually driving the first step shaft; the second function is to control the opening and engagement of the pawl by engaging the V-groove with the side of the special-shaped hand lever, and to provide a reverse locking device for the pawl.

[0099] refer to Figure 28The guide rail connector 301 has a second L-shaped structure. The horizontal plate of the second L-shaped structure has four arrayed eighteenth mechanical interfaces, each a ninth-step hole 3011. A ninth bolt is installed within each ninth-step hole 3011 and engages with a ninth screw hole 2074. The vertical plate end face of the guide rail connector 301 is flush with the end face of the guide rail. A nineteenth mechanical interface is located on the vertical plate end face of the guide rail connector 301. This nineteenth mechanical interface consists of tenth-step holes 3012 distributed at the four corner points of an isosceles trapezoid. A tenth bolt is installed within each tenth-step hole 3012 and connects to the side plate 311. This invention uses the ninth bolts within the four ninth-step holes to connect with the ninth screw holes, fixing the other end of the guide rail to the guide rail connector. The vertical plate end face of the guide rail connector is flush with the end face of the guide rail for limiting the slider in the dual-axis guide rail slider assembly. The tenth bolts distributed at the four corner points on the base of the isosceles trapezoid connect the side plate.

[0100] Example 5: Based on Example 4, with reference to... Figure 8 , Figure 29The flexible clamp assembly 3 includes a positioning plate 302 and a movable plate 304 disposed inside the outer cover 312. The positioning plate 302 is provided with a plurality of pressure column through holes 3021 arranged at intervals. Pressure columns 306 are disposed in the pressure column through holes 3021. A plurality of circular grooves 3022 are provided on the end face of the positioning plate 302 near the movable plate 304, which are arranged corresponding to the pressure column through holes 3021. A sealing ring 303 is disposed in the circular groove 3022. The sealing ring 303 is an O-ring and is made of any one of rubber, nitrile, or silicone. The positioning plate 302 has a twentieth mechanical interface on its end face near the movable plate 304. The twentieth mechanical interface includes four arrayed eleventh stepped holes 3023 and an eleventh screw hole 3024 located at the small end of each eleventh stepped hole 3023. The large end of the eleventh stepped hole 3023 is used to position one end of the first spring 307 on the positioning plate 302. The eleventh screw hole 3024 is used for the positioning pin 305 to pass through the first spring 307 and fix it to the positioning plate 302. The first spring 307 is a linear straight column spring conforming to GB / T According to the provisions of 1239.2-2009; a twenty-first mechanical interface is provided on the end face of the positioning plate 302 near the movable plate 304. The twenty-first mechanical interface includes four arrayed twelfth step holes 3025 and a twelfth screw hole 3026 located at the small end of the twelfth step hole 3025. A support column 310 is provided in the twelfth step hole 3025; a first annular groove 3027 is provided on the outer edge of the end face of the positioning plate 302 near the outer cover 312; the four arrayed twelfth step holes 3025 are located on the outer ring of the four eleventh step holes 3023. This invention employs several spaced pressure column through holes on a positioning plate for the pressure column to slide within the holes; a circular groove for positioning the sealing ring; and an eleventh screw hole for fixing a positioning pin, which limits the first spring between the positioning plate and the movable plate. The positioning plate also features four eleventh-step holes, the larger end of which is used to fix one end of the first spring. The larger end of the twelfth-step hole is used for precise positioning of the support column, and the twelfth screw hole is used to fix the support column to the positioning plate. A first annular groove is used for positioning the outer casing on the positioning plate.

[0101] refer to Figure 30On the end face of the movable plate 304 near the positioning plate 302, there are several annular steps 3042 arranged at intervals. Several through holes 3041 are arranged at intervals on the movable plate 304, with each through hole 3041 corresponding to a pressure column through hole 3021. The through holes 3041 communicate with the inner holes of the annular steps 3042. On the end face of the movable plate 304 near the positioning plate 302, there are four thirteenth-step holes 3043, each corresponding to an eleventh-step hole 3023. The small end of the thirteenth-step hole 3043 allows the positioning pin 305 to pass through, while the large end is used for positioning the other end of the first spring 307. Four clearance grooves 3044 are provided on the movable plate 304, each corresponding to a twelfth-step hole 3025. The clearance grooves 3044 are used to allow clearance for the support column 310. This invention employs four thirteenth-step holes on a movable plate, with the larger end of each thirteenth-step hole used to fix the other end of the first spring. A spherical end of a pressure post passes sequentially through a through hole, a sealing ring, and a pressure post through hole before protruding from the positioning plate. An annular step is used to press the sealing ring, with the pressure post passing through the inner ring and the outer ring fixed to the circular groove of the positioning plate. When the movable plate presses down on the sealing ring, the inner ring of the sealing ring is compressed and deformed, tightly pressing the pressure post, thus locking the pressure post at any position.

[0102] refer to Figure 31 The locating pin 305 is a three-section stepped shaft, with one end being a small end, a middle section, and a large end, respectively. The small end is a threaded section 3051, used to fix the locating pin 305 to the locating plate 302. The middle section is the third shaft section 3052, and the large end is the fourth shaft section 3053. The outer cylindrical surface of the fourth shaft section 3053 has mutually parallel first planes 3054. In this invention, the locating pin passes through the small end of the thirteenth stepped hole, the first spring, and then connects to the eleventh threaded hole to fix the locating pin to the locating plate. The first spring is used to restrict the positioning plate and the movable plate, and is used for the reset of the movable plate. The first plane on the outer cylindrical surface of the fourth shaft section is used for locking the locating pin to the locating plate with a wrench or other locking tool.

[0103] refer to Figure 32 , Figure 33The pressure post 306 is the second stepped shaft, the small end of which is the fifth shaft segment 3061. The ball head 3062 is located at the end of the fifth shaft segment 3061 and contacts the patient's skull. The large end of the second stepped shaft is the sixth shaft segment 3063. The center of the large end face of the sixth shaft segment 3063 is provided with the twenty-second mechanical interface, which is the fourteenth stepped hole 3064. The small end of the fourteenth stepped hole 3064 is the thirteenth screw hole 3065, which is connected to the guide post 308. The large end of the fourteenth stepped hole 3064 is used for positioning one end of the second spring 309. The second spring 309 is sleeved on the outer ring of the guide post 308. The second spring 309 is a linear straight column spring, conforming to the provisions of GB / T 1239.2-2009. The invention employs a fifth shaft segment to pass through the movable plate and positioning plate, and the spherical shape makes it more comfortable when in contact with the patient's skull; the large end of the second stepped shaft is used as the sixth shaft segment, which is used to limit the movement of the movable plate during the ejection and compression of the pressure column; the large end of the fourteenth stepped hole limits one end of the second spring; and the thirteenth screw hole is used to fix the guide column and the pressure column.

[0104] refer to Figure 34 The guide post 308 is a third-step shaft, with its small end being a second stud 3081, which engages with a thirteenth threaded hole 3065. The large end of the third-step shaft is a seventh shaft segment 3082, with parallel second planes 3083 on its outer cylindrical surface. This invention uses the second stud and the thirteenth threaded hole to connect and fix the guide post and the pressure post. The parallel second planes on the outer cylindrical surface of the seventh shaft segment are used by locking tools such as wrenches to lock the guide post onto the pressure post, and also serve to guide the spring during compression, thus enhancing the guiding function of the spring.

[0105] refer to Figure 35 The support column 310 is a third-step shaft, with a third stud 3101 at its small end and an eighth shaft segment 3102 at its large end. A twenty-third mechanical interface, which is a fourteenth screw hole 3103, is located at the center of the large end face of the eighth shaft segment 3102. Parallel third planes 3104 are provided in the middle of the outer cylindrical surface of the eighth shaft segment 3102. This invention uses a third stud connected to a twelfth screw hole for fixing the support column to the positioning plate; the parallel third planes in the middle of the outer cylindrical surface of the eighth shaft segment are used by locking tools such as wrenches to lock the support column onto the positioning plate.

[0106] refer to Figure 36 , Figure 37The side plate 311 has a blind hole 3111 on the end face near the outer cover 312, corresponding to the pressure post 306, for positioning the other end of the second spring 309; the outer edge of the side plate 311 near the outer cover 312 has a second annular groove 3112 for positioning the outer cover 312; the side plate 311 has a twenty-fourth mechanical interface on the end face near the outer cover 312, which consists of four arrayed fifteenth step holes 3113, each corresponding to a twelfth step hole 3025; the larger end of the fifteenth step hole 3113 is used for positioning the support post 310, and the smaller end of the fifteenth step hole 3113 is a second through hole 3114; the side plate 311 Two countersunk holes 3115 spaced apart are provided on the end face away from the outer cover 312. The two countersunk holes 3115 are away from the guide rail connector 301. The two countersunk holes 3115 are arranged corresponding to the second through hole 3114. Countersunk screws are provided in the two countersunk holes 3115 and are connected to the support column 310. The center of the side plate 311 has a twenty-fifth mechanical interface, which is the fifteenth screw hole 3116. The fifteenth screw hole 3116 is connected to the handle 313. The side plate 311 is provided with a twenty-sixth mechanical interface, which is the sixteenth screw hole 3117 spaced apart. The two sixteenth screw holes 3117 are arranged one-to-one with the tenth step hole 3012 at the two corner points of the upper base of the isosceles trapezoid. This invention uses the large end of the fifteenth-step hole for positioning the support column; two countersunk screws pass through the second through hole at the small end of the fifteenth-step hole to connect to the fourteenth screw hole, fixing the side plate away from the guide rail connector to the support column; two tenth bolts in the tenth-step holes pass through the second through hole at the small end of the fifteenth-step hole to connect to the fourteenth screw hole, fixing the guide rail connector to the side plate and support column; two more tenth bolts in the tenth-step holes connect to the sixteenth screw hole, fixing the guide rail connector to the side plate; a second spring is located between the blind hole and the large end of the fourteenth-step hole for resetting the column; and a second annular groove is used for positioning the outer cover on the side plate.

[0107] refer to Figure 38 The outer cover 312 is a square tube 3121 with openings at both ends. In this invention, the two ends of the square tube are respectively located on the first annular groove and the second annular groove, and the outer cover is fixed between the side plate and the positioning plate.

[0108] refer to Figure 39One end of the handle 313 is a fourth stud 3131, which screws into the fifteenth screw hole 3116. The end of the fourth stud 3131 located inside the outer cover 312 contacts the center of the movable plate 304. The other end of the handle 313 is a non-circular handle portion 3132. In this invention, when the handle is rotated clockwise, the handle moves the movable plate toward the spherical head of the pressure post, pressing the sealing ring and compressing the first spring; when the handle is rotated counterclockwise, the handle moves the movable plate away from the spherical head of the pressure post, releasing the sealing ring, and the first spring resets, causing the movable plate to reset.

[0109] The above-described embodiments are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A flexible fixation device for assisting craniofacial osteotomy, mounted on a bed (4), characterized in that: Flexible fixing components are respectively provided on both sides of the bed (4). The flexible fixing components include a pawl and rack assembly (2). The pawl and rack assembly (2) is connected to the side fixing plate of the bed (4) through the support assembly (1). The pawl and rack assemblies (2) on both sides are connected to the flexible clamp assembly (3) through the guide rail connector (301). The pawl and rack assembly (2) includes a double-axis guide rail slider assembly (207) and a pawl (205). The double-axis guide rail slider assembly (207) includes a slider (2071) installed on the guide rail. The bottom surface of the guide rail is connected to the rack (208). The pawl (205) meshes with the rack (208). The pawl (205) is provided with a reverse locking device. The flexible clamp assembly (3) includes a positioning plate (302). One side is connected to the guide rail connector (301) in sequence through the support column (310) and the side plate (311). Several pressure columns (306) are arranged at intervals on the end faces of the positioning plates (302) on both sides. A second spring (309) is provided between the end of the pressure column (306) away from the positioning plate (302) and the side plate (311). A movable plate (304) is provided between the side plate (311) and the positioning plate (302). Several sealing rings (303) are provided between the movable plate (304) and the positioning plate (302). A ball head (3062) is provided at one end of the pressure column (306). The ball head (3062) protrudes from the sealing ring (303) and exposes the positioning plate (302). The ball heads (3062) on both sides fix the two sides of the patient's skull.

2. The flexible fixation device for assisting craniofacial osteotomy according to claim 1, characterized in that: An outer cover (312) is provided between the outer edge of the positioning plate (302) and the outer edge of the side plate (311); four arrayed eleventh step holes (3023) are provided on the end face of the positioning plate (302) near the movable plate (304), the large end of the eleventh step hole (3023) is used to position one end of the first spring (307) on the positioning plate (302); a thirteenth step hole (3043) is provided on the end face of the movable plate (304) near the positioning plate (302), the small end of the thirteenth step hole (3043) allows the positioning pin (305) to pass through, and the large end of the thirteenth step hole (3043) is used to position the other end of the first spring (307); the positioning pin (305) 05) After passing through the small end of the thirteenth step hole (3043) and the first spring (307) in sequence, it is screwed into the small end of the eleventh step hole (3023) to restrict the first spring (307) between the positioning plate (302) and the movable plate (304); the center of the side plate (311) is provided with the fifteenth screw hole (3116), the fifteenth screw hole (3116) is connected to the handle (313), one end of the handle (313) is the fourth stud (3131), the fourth stud (3131) is screwed into the fifteenth screw hole (3116), the end of the fourth stud (3131) located inside the outer cover (312) is in contact with the center of the movable plate (304), and the first spring (307) is used for the reset of the movable plate (304).

3. The flexible fixation device for assisting craniofacial osteotomy according to claim 2, characterized in that: The positioning plate (302) is provided with a plurality of pressure column through holes (3021) arranged at intervals. On the end face of the positioning plate (302) near the movable plate (304), there are a plurality of circular grooves (3022) arranged corresponding to the pressure column through holes (3021). A sealing ring (303) is provided in the circular groove (3022). On the end face of the movable plate (304) near the positioning plate (302), there are several annular steps (3042) arranged at intervals. On the movable plate (304), there are several through holes (3041) arranged at intervals. The through holes (3041) correspond one-to-one with the through holes (3021) of the pressure column. The through holes (3041) are connected to the inner holes of the annular steps (3042). One end of the spherical head (3062) of the pressure column (306) passes through the through hole (3041), the sealing ring (303), and the through hole (3021) of the pressure column in sequence and then protrudes from the positioning plate (3042). 02); The other end of the pressure column (306) is provided with a fourteenth step hole (3064). The small end of the fourteenth step hole (3064) is connected to the guide column (308). The large end of the fourteenth step hole (3064) is used to position one end of the second spring (309). The second spring (309) is sleeved on the outer ring of the guide column (308). Several blind holes (3111) are provided on the side plate (311). The blind holes (3111) are arranged in correspondence with the through holes (3041). The blind holes (3111) are used to position the other end of the second spring (309).

4. The flexible fixation device for assisting craniofacial osteotomy according to claim 2, characterized in that: The positioning plate (302) has four arrayed twelfth-step holes (3025) on its end face near the movable plate (304). A support column (310) is installed in the twelfth-step hole (3025), and the support column (310) is screwed into the small end of the twelfth-step hole (3025). The movable plate (304) has four clearance grooves (3044), which are arranged one-to-one with the twelfth-step holes (3025). The clearance grooves (3044) are used to make way for the support column (310). The outer edge of the end face of the positioning plate (302) near the outer cover (312) has a first annular groove (3027). The outer edge of the side plate (311) near the outer cover (312) is provided with a second annular groove (3112); four arrayed fifteenth step holes (3113) are provided on the side plate (311) near the outer cover (312), and the fifteenth step holes (3113) are arranged in a one-to-one correspondence with the twelfth step holes (3025); the large end of the fifteenth step hole (3113) is used for positioning the support column (310), and the small end of the fifteenth step hole (3113) is the second through hole (311). 4) On the end face of the side plate (311) away from the outer cover (312), there are countersunk holes (3115) arranged at intervals. The two countersunk holes (3115) are away from the guide rail connector (301). The two countersunk holes (3115) are arranged corresponding to the second through hole (3114). Countersunk screws are provided in the countersunk holes (3115). The two countersunk screws pass through the second through hole (3114) to connect to the support column (310). The side plate (311) is provided with sixteenth screw holes (3117) arranged at intervals. The guide rail connector (301) has tenth step holes (3012) distributed at the four corners of the isosceles trapezoid on the vertical plate end face. Tenth bolts are installed in the tenth step holes (3012). Two tenth bolts pass through the tenth step holes (3012) at the two corners of the upper base of the isosceles trapezoid and connect to the sixteenth screw hole (3117). The other two tenth bolts pass through the tenth step holes (3012) and the second through hole (3114) at the two corners of the lower base of the isosceles trapezoid and connect to the support column (310).

5. A flexible fixation device for assisting craniofacial osteotomy according to claim 1, characterized in that: The support assembly (1) includes parallel support rods (101), a connecting rod (102) is provided between the upper parts of the two support rods (101), and the lower part of any support rod (101) is connected to the side fixing plate of the bed body (4) through a medical clamp (103). The support rod (101) is arranged vertically. The upper end of the support rod (101) is a cylindrical end (1011) and the lower end is a flat end (1012). A rectangular opening slot (1013) and a first stepped hole (1014) are provided on the end faces of the two cylindrical ends (1011) that are close to each other. The large end of the first stepped hole (1014) is at 180° with the rectangular opening slot (1013), and the small end of the first stepped hole (1014) is connected to the bottom plane of the rectangular opening slot (1013). A first bolt is provided in the first stepped hole (1014). The connecting rod (102) is a first cuboid arranged horizontally. The two ends of the first cuboid are respectively located in the corresponding rectangular opening slots (1013). The two end faces of the first cuboid are provided with first screw holes (1021) arranged at intervals. The first bolt is screwed into the corresponding first screw hole (1021) to connect the support rod (101) and the connecting rod (102) into one unit.

6. A flexible fixation device for assisting craniofacial osteotomy according to claim 5, characterized in that: The connecting rod (102) has a first slot (1022) in the middle of its top surface. The first slot (1022) has second stepped holes (1023) arranged at intervals. The small end of the second stepped hole (1023) is connected to the top surface of the first slot (1022). A second bolt is installed in the second stepped hole (1023). The second bolt is connected to the ratchet rack assembly (2).

7. A flexible fixation device for assisting craniofacial osteotomy according to claim 6, characterized in that: The medical clamp (103) includes a medical fixation clamp (1031), which is a horizontal U-shaped structure. The opening of the U-shaped structure is connected to the side fixing plate of the bed (4). A first rectangular through hole (1032) is provided on the straight plate of the U-shaped structure, and the flat end (1012) is located in the first rectangular through hole (1032). A second slot (1034) is provided on the inner side of both straight plates of the U-shaped structure, and the second slot (1034) is connected to the side fixing plate of the bed (4).

8. A flexible fixation device for assisting craniofacial osteotomy according to claim 7, characterized in that: The U-shaped structure has a fourth mechanical interface on its arc-shaped bottom surface. The fourth mechanical interface is a second screw hole (1033). A knob (5) is installed in the second screw hole (1033). One end of the knob (5) is a gripper and the other end is a screw. A third screw hole (1035) is installed at the end of the screw. The screw of the knob (5) is connected to the pressure block (6). The pressure block (6) is a cylinder. A third stepped hole (1036) is installed on one end face of the cylinder. A third bolt is installed in the third stepped hole (1035). The third bolt is screwed into the third screw hole (1035).

9. A flexible fixation device for assisting craniofacial osteotomy according to claim 1, characterized in that: The pawl rack assembly (2) includes a pawl fixing seat (201), which is an F-shaped structure. A first mounting groove (2011) is provided in the opening of the F-shaped structure. A double-axis guide rail slider assembly (207) is provided in the first mounting groove (2011). The two ends of the guide rail of the double-axis guide rail slider assembly (207) are respectively connected to the slide rail end cap (209) and the guide rail connector (301). Four fourth step holes (2012) are arranged in an array on the top surface of the long side of the F-shaped structure. A fourth bolt is provided in the fourth step hole (2012) and is connected to the slider (2071). An H-shaped structure is provided below the short side of the F-shaped structure. A second mounting groove (2013) is provided in the upper opening of the H-shaped structure. A pawl central shaft (202) and a pawl (205) are provided in the second mounting groove 2013. A fifth pawl is provided in the corresponding part of the lower vertical plate of the F-shaped structure and the second mounting groove (2013) from top to bottom. The fifth bolt is provided in the stepped hole (2014), the fourth screw hole (2015), and the fifth stepped hole (2014). The fifth bolt is connected to the pull block (206). One side of the second mounting groove (2013) is a ramp groove (2016). The upper part of the H-shaped structure away from the F-shaped structure is provided with the fifth screw hole (2017) and the first pin hole (2018) arranged at intervals. The upper horizontal plate of the F-shaped structure is provided with two fifth screw holes (2017). The two fifth screw holes (2017) on the upper horizontal plate end face and the two fifth screw holes (2017) on the upper end face of the H-shaped structure are distributed at the four corners of the rectangle. The four fifth screw holes (2017) are used to connect the pawl cover plate (210). The lower opening of the H-shaped structure is the third mounting groove (2019). The bottom plane of the third mounting groove (2019) is provided with the sixth screw hole (2020) arranged at intervals. The second bolt is screwed into the sixth screw hole (2020).

10. A flexible fixation device for assisting craniofacial osteotomy according to claim 9, characterized in that: The pawl central shaft (202) is provided with a first stud (2021), a first shaft section (2022), and a second shaft section (2023) in sequence from one end to the other. The diameters of the first stud (2021) and the second shaft section (2023) are both smaller than the diameter of the first shaft section (2022). A pawl (205) is installed on the second shaft section (2023). The first stud (2021) is connected to the fourth screw hole (2015). An annular groove (2024) is provided on the outer ring of the end of the second shaft section (2023) away from the first shaft section (2022). The annular groove (2024) is used for the installation of the E-type snap ring (203). An open groove (2025) is provided at the center of the end face of the second shaft section (2023) away from the first shaft section. One end of the pawl (205) is provided with a first ratchet tooth (2051), and the other end of the pawl (205) is provided with a fixing hole (2052). The second shaft section (2023) of the pawl central shaft (202) is installed in the fixing hole (2052). The pawl (205) is also provided with a mounting hole (2053) for fixing the small end of the tower spring (204). The mounting hole (2053) and the fixing hole (2052) are arranged at right angles. The tower spring (204) has a structure with one end larger than the other. The large end of the tower spring (204) is stuck in the inclined groove (2016) of the pawl fixing seat (201). The reverse locking device includes a lever (206), which includes a first stepped shaft (2063). The small end of the first stepped shaft (2063) is a special-shaped shaft section (2062). The cross-section of the special-shaped shaft section (2062) is triangular. The apex arc and the base arc of the triangle are circular with the outer cylindrical surface of the large end of the first stepped shaft (2063). A seventh screw hole (2061) is provided on the end face of the small end of the first stepped shaft (2063). A fifth bolt is connected to the seventh screw hole (2061). The pawl cover plate (210) is a rectangular block with four arrayed eighth step holes (2101) and spaced second pin holes (2102). The second pin holes (2102) correspond to the first pin holes (2018), and a pin is installed in each second pin hole (2102). The eighth step holes (2101) are located at the four corners of the rectangular block, and an eighth bolt is installed in each eighth step hole (2101). The eighth bolt engages with the fifth screw hole (2017). The lower part of both sides of the cover plate (210) is provided with a rectangular boss. One rectangular boss is provided with a stepped platform (2103) arranged at intervals. The center of the other rectangular boss is provided with a V-groove (2105). A central hole (2104) is provided in the opening of the V-groove (2105). The large end of the first stepped shaft (2063) passes through the central hole (2104) and connects to the irregular hand lever (2064). The irregular hand lever (2064) cooperates with the V-groove (2105).

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