A device and method for distraction and fixation of a tibial osteotomy

Abstract

The application discloses a device and method for distraction and fixation of tibial osteotomy. The device for distraction and fixation of tibial osteotomy comprises a distraction assembly, which comprises left and right distraction devices arranged detachably. The left distraction device comprises a left turnover plate and a left fixed plate, and the front end of the left turnover plate is hinged to the front end of the left fixed plate. The right distraction device further comprises a right turnover plate and a right fixed plate, and the front end of the right turnover plate is hinged to the front end of the right fixed plate. Adjacent sides of the left and right turnover plates are provided with upper notches, and the rear end openings of the upper notches are used for switching sliding into the sliding entrances of a moving plate and a supporting wedge. The left and right turnover plates are linked through the moving plate. The device further comprises an angle adjusting assembly for controlling the distraction angle of the left and right distraction devices. The application realizes controllable distraction angle, and controls the distraction angle through the rotation angle control of a driving knob.

Description

Technical Field

[0001] This invention relates to the field of surgical instruments, specifically to osteotomy, distraction and fixation devices. Background Technology

[0002] High tibial osteotomy (HTO) is a lower limb alignment surgery that adjusts the knee joint alignment from the worn medial compartment to the relatively normal lateral compartment through tibial osteotomy. This slows down the destruction of the medial compartment, treating medial compartment osteoarthritis of the knee and prolonging the lifespan of the knee joint. Medial open wedge high tibial osteotomy (MOWHTO) has gradually become the mainstream surgical method for treating varus deformity of the knee due to its advantages such as simple surgical procedure, precise adjustment of the correction angle during surgery, no risk of peroneal nerve injury, and no need for fibular osteotomy.

[0003] In traditional procedures, after osteotomy, the distraction device is created by repeatedly stacking and hammering in bone chisels. This method makes precise control of the distraction angle difficult and can damage the tibia during the hammering process. After distraction, a distractor is needed to maintain the distraction angle. The bone plate is then fixed. The traditional combination of bone chisels and distractors requires switching between instruments during surgery, which is inconvenient and makes the procedure cumbersome. Postoperatively, after fixation, a large osteotomy gap remains within the tibia, which is detrimental to bone growth.

[0004] There is an urgent need for a single instrument that can accommodate both osteotomy and fixation. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a device and method for opening and fixing tibial osteotomy, which solves at least one of the above-mentioned technical problems.

[0006] The technical solution of the present invention is: a device for opening and fixing tibial osteotomy, comprising an opening assembly, wherein the opening assembly comprises a left opening device and a right opening device that are detachably arranged on the left and right sides;

[0007] The left expander includes a left flip plate and a left fixed plate, and the front end of the left flip plate is hinged to the front end of the left fixed plate.

[0008] The right expander also includes a right flip plate and a right fixing plate, with the front end of the right flip plate hinged to the front end of the right fixing plate.

[0009] The left and right flip plates are provided with upper notches on their adjacent sides, and the upper notches are provided with rear openings. The rear openings of the upper notches are used to switch the sliding entrance of the sliding movable plate and the sliding entrance of the support wedge. The inner wall of the upper notches is provided with a connecting structure for detachably connecting the movable plate. The left and right flip plates are linked together through the movable plate.

[0010] The left and right fixing plates are provided with a lower notch on their adjacent sides. The lower notch is provided with a rear end opening, which is used for the sliding entrance of the support wedge to slide in.

[0011] It also includes an angle adjustment assembly for controlling the opening angle of the left and right expanders, the angle adjustment assembly including a housing, a sliding rack and a drive knob;

[0012] The housing and the sliding rack are respectively fixed to the left side of the left fixed plate of the left expander and the left flip plate, or the housing and the sliding rack are respectively fixed to the right fixed plate of the right expander and the right flip plate.

[0013] The drive knob is mounted on the outside of the housing, and the drive knob is connected to the sliding rack via a transmission gear set.

[0014] This invention combines an expansion component and an angle adjustment component to facilitate controllable expansion angle. The control of the expansion angle is ensured by controlling the rotation angle of the drive knob.

[0015] Meanwhile, the notches of the left and right flip plates of the present invention are used to switch the sliding moving plate and the support wedge, realizing the linkage between the left and right flip plates during the opening process. At the same time, it also realizes the installation space when the support wedge needs to be inserted, which facilitates the insertion of the support wedge.

[0016] More preferably, the angle adjustment component further includes a check module for driving the knob to rotate unidirectionally, causing the sliding rack to rise in an arc shape and preventing it from returning in the opposite direction, and an unlocking module for releasing the lock of the check module.

[0017] This invention facilitates locking when raised to a specific angle and resetting the angle by using a check-back module and an unlocking module.

[0018] More preferably, the transmission gear set includes a drive gear, the drive gear being connected to a transmission shaft, the transmission shaft being rotatably mounted within the housing;

[0019] The check valve module includes a check valve wheel, the drive knob is tractively connected to the check valve wheel, the check valve wheel is located inside the housing, and a first spring is sandwiched between the check valve wheel and the housing;

[0020] The check wheel is provided with one-way meshing teeth;

[0021] The drive gear is provided with a tooth structure that meshes with the one-way meshing teeth.

[0022] By rotating the drive knob counterclockwise, the check wheel rotates counterclockwise, which in turn drives the drive gear to rotate counterclockwise. Due to the cooperation between the one-way meshing teeth and the gear tooth structure, rotating the drive knob counterclockwise can increase the opening angle. Rotating the drive knob clockwise cannot transmit power to the drive gear. At the same time, due to the cooperation between the one-way meshing teeth and the gear tooth structure, the drive gear cannot rotate clockwise, thus achieving the check angle of opening.

[0023] More preferably, both the drive knob and the check wheel have shaft holes for inserting the drive shaft.

[0024] More preferably, the drive knob is provided with a rotating shaft that is rotatably connected to the housing, and the rotating shaft is provided with a first limiting groove and a second limiting groove that are axially and inwardly disposed.

[0025] The unlocking module includes an elastic locking piece, and the housing has a groove for the elastic locking piece to slide radially on the transmission shaft;

[0026] The elastic locking piece has a through hole for the transmission shaft to pass through, and a limiting protrusion for embedding into the first limiting groove or the second limiting groove is provided in the through hole;

[0027] A spring groove is installed at the bottom of the slide, and a second spring is installed in the spring groove. The second spring is used to provide the elastic force for the drive shaft to abut against the elastic locking piece.

[0028] When the limiting protrusion is embedded in the first limiting groove, the one-way meshing teeth on the anti-return wheel abut against the gear teeth on the drive gear;

[0029] When the limiting protrusion is embedded in the second limiting groove, the one-way meshing teeth on the anti-return wheel are separated from the gear teeth on the drive gear.

[0030] More preferably, the left side of the movable plate is slidably connected to the left side of the notch on the left flip plate;

[0031] The right side of the movable plate is slidably connected to the right side of the notch on the right flip plate.

[0032] More preferably, the connecting structure is a strip-shaped groove or a strip-shaped protrusion with its length direction being front-to-back.

[0033] More preferably, the left flip plate and the right flip plate are connected by mutually cooperating protrusions and grooves.

[0034] The left and right fixing plates are connected by interlocking protrusions and grooves.

[0035] More preferably, a rotating shaft is fixed on the housing;

[0036] The left flip plate and the left fixed plate are rotatably connected via the rotating shaft;

[0037] The right flip plate and the right fixed plate are rotatably connected via the rotating shaft.

[0038] More preferably, the left flip plate and the left fixed plate are axially slidably connected to the rotating shaft.

[0039] It facilitates sliding to the left to separate.

[0040] Further preferably, the housing includes a first housing and a second housing disposed on the left and right sides, the first housing and the second housing forming a cavity for accommodating the transmission gear set.

[0041] More preferably, the sliding rack is connected to the left flip plate or the right flip plate via a transmission rod;

[0042] The housing has an arc-shaped guide groove for slidingly connecting the transmission rod.

[0043] More preferably, the housing is provided with an arc-shaped groove for the sliding rack to slide in an arc shape.

[0044] More preferably, the housing has a fan-shaped structure, and the arc-shaped groove is formed on the outer circumference of the housing.

[0045] More preferably, the transmission gear set includes a driving gear, a first driven gear, and a second driven gear. The drive knob is coaxially connected to the driving gear. The driving gear meshes with the first driven gear, the first driven gear meshes with the second driven gear, and the second driven gear meshes with the sliding rack.

[0046] The drive knob rotates counterclockwise, which in turn drives the sliding rack to rotate counterclockwise.

[0047] More preferably, the transmission ratio of the driving wheel, the first driven wheel, the second driven wheel, and the sliding rack is 7:9:9:140.

[0048] This allows the drive knob to rotate 20°, and the expansion component to expand 1°, thus enabling more precise adjustment of the expansion angle.

[0049] More preferably, the drive knob is provided with circumferentially arranged angle markings for displaying the opening angle;

[0050] The housing is provided with a reference alignment line for aligning the angle mark.

[0051] The angle markings allow for easy identification of the opening angle. Each 20° rotation of the drive knob corresponds to a 1° change in the displayed opening angle, with an adjustable range of 1° to 15°. This wide range allows for intuitive and precise adjustment of the opening angle. Furthermore, the opening angle is consistent with the angle of the support wedge 4, which ranges from 4° to 15°, covering actual surgical needs.

[0052] The drive gear has a module of 1 and 14 teeth.

[0053] The first driven wheel has a gear module of 1 and 18 teeth;

[0054] The third driven wheel has a gear module of 1 and 18 teeth.

[0055] The sliding rack has a module of 1 for the entire circle and a number of 280 teeth for the entire circle.

[0056] More preferably, it also includes a fixing assembly for fixing the support wedge, the fixing assembly including a fixing plate, a fixing nail, and a tension screw;

[0057] The fixation plate is provided with a fitting surface that conforms to the bone surface;

[0058] The fixing plate and the support wedge are connected by a tension screw, and the tension screw is threadedly connected to the support wedge;

[0059] The fixing plate has through holes on both sides of the connecting support wedge for passing through the fixing nail, and the end of the fixing nail has a threaded hole for implantation into the bone.

[0060] A method for opening and fixing tibial osteotomy, comprising opening and fixing using the aforementioned device for opening and fixing tibial osteotomy;

[0061] Includes the following steps:

[0062] Step 1: Insert the retractor into the bone gap formed after the osteotomy of the tibia;

[0063] Step 2: Rotate the drive knob to cause the left and right flip plates to flip synchronously and adjust the opening angle.

[0064] Step 3: Once the appropriate opening angle is reached, remove the movable plate and switch to install the support wedge corresponding to the opening angle.

[0065] The left retractor moves to the left to withdraw from the bone suture, and the right retractor moves to the right to withdraw from the bone suture.

[0066] In a further preferred step, step four involves implanting a fixation plate to ensure it fits snugly against the bone surface.

[0067] A fixation pin is implanted, and the fixation pin is threaded into the fixation plate.

[0068] A tension screw is implanted, which passes through the fixing plate and engages with the support wedge thread.

[0069] Beneficial effects:

[0070] This invention solves the problems of uncontrollable and unintuitive spreading angle and cumbersome surgical operation in high tibial osteotomy, while also improving the stability of the fixation device.

[0071] This invention provides both opening angle and support, facilitating implant placement. Compared to the traditional method of using two instruments—a bone chisel and a retractor—it saves surgical time. The retractor device features a knob that makes the opening angle intuitive and visible, ensuring precise control of the rotation angle. The internal gear structure guarantees effective support.

[0072] The fixation components include a variety of support wedges available in different sizes, improving surgical operability. The hollow mesh design inside the support wedges, manufactured using 3D-printed titanium alloy additives, not only provides support for the bone but also allows bone to grow in, enhancing implant stability and surgical safety. Furthermore, the biocompatibility of titanium alloy ensures safety for the human body. A tension screw engages with the threaded support wedge for locking. The screw contacts the curved surface of the fixation plate, applying pressure to the support wedge during insertion and enhancing device stability. Attached Figure Description

[0073] Figure 1 This is a schematic diagram of the device for opening and fixing the tibia osteotomy according to the present invention;

[0074] Figure 2 This is a schematic diagram of the angle adjustment component of the present invention;

[0075] Figure 3 This is a partial structural schematic diagram of the angle adjustment component of the present invention;

[0076] Figure 4 This is a partial structural schematic diagram of the angle adjustment component of the present invention;

[0077] Figure 5 This is a schematic diagram of the structure from another perspective of the present invention;

[0078] Figure 6 This is a partial structural diagram of the anti-return module and the unlocking module of the present invention;

[0079] Figure 7 This is a partial cross-sectional view of the elastic locking piece of the present invention when the limiting protrusion is embedded in the second limiting groove;

[0080] Figure 8 This is a partial cross-sectional view of the elastic locking piece of the present invention when the limiting protrusion is embedded in the second limiting groove;

[0081] Figure 9 This is a schematic diagram of a device for opening and fixing tibial osteotomy according to the present invention.

[0082] Figure 10 This is a schematic diagram of the structure of the expansion component of the present invention;

[0083] Figure 11 This is a schematic diagram of the structure of the right-side expander of the present invention;

[0084] Figure 12 This is a schematic diagram of the structure of the left support opener of the present invention;

[0085] Figure 13 This is a schematic diagram of the structure of the fixing component of the present invention;

[0086] Figure 14 This is a schematic diagram showing the state of the tibia after osteotomy.

[0087] Figure 15 This is a schematic diagram of the state after the expansion component of the present invention is inserted into the tibia. Figure 1 ;

[0088] Figure 16 This is a schematic diagram of the state after the expansion component of the present invention is inserted into the tibia. Figure 2 ;

[0089] Figure 17 This is a schematic diagram of the state after the expansion component of the present invention is inserted into the tibia. Figure 3 ;

[0090] Figure 18 This is a partial schematic diagram of the connection point when the right and left expanders of the present invention are combined;

[0091] Figure 19 This is a schematic diagram of the drive knob of the present invention;

[0092] Figure 20 This is a schematic diagram of the state of the spreading component after it is inserted into the tibia in this invention.

[0093] Figure 21 This is a schematic diagram showing the state of removing the moving plate in this invention;

[0094] Figure 22 This is a schematic diagram showing the state of the implanted support wedge in this invention;

[0095] Figure 23 This is a schematic diagram showing the state of the right and left expanders removed in this invention;

[0096] Figure 24 This is a schematic diagram showing the state of the implanted fixation plate in this invention;

[0097] Figure 25 This is a schematic diagram showing the state of the implanted fixation nail in this invention;

[0098] Figure 26 This is a schematic diagram showing the state after the tension screw is implanted in this invention.

[0099] In the diagram: 1-Angle adjustment component, 2-Spreading component, 3-Fixing plate, 4-Support wedge, 5-Tension screw, 6-Fixing nail;

[0100] 11-Second housing, 12-First housing, 13-Driving wheel, 14-First driven wheel, 15-Second driven wheel, 16-Sliding rack; 17-Check wheel, 18-Gear structure, 19-First spring, 110-Second spring, 111-Elastic locking piece;

[0101] 131-Driving gear, 132-Transmission shaft, 133-Drive knob, 141-First driven gear, 142-First driven shaft, 151-Second driven gear, 152-Second driven shaft;

[0102] 21-Right expander, 22-Left expander, 23-Moving plate, 24-Rotating shaft;

[0103] 211-Right flip plate, 212-Right fixed plate, 213-Second sliding rod, 221-Left flip plate, 222-Left fixed plate, 223-First sliding rod, 224-Limiting plate. Detailed Implementation

[0104] See Figures 1 to 26Specific embodiment 1: A device for opening and fixing tibial osteotomy includes an opening assembly 2, which includes a left opener 22 and a right opener 21 detachably disposed on the left and right sides. The left opener 22 includes a left flip plate 221 and a left fixing plate 222, with the front end of the left flip plate 221 hinged to the front end of the left fixing plate 222. The right opener 21 also includes a right flip plate 211 and a right fixing plate 212, with the front end of the right flip plate 211 hinged to the front end of the right fixing plate 212. An upper notch is provided on the adjacent side of the left flip plate 221 and the right flip plate 211, and the upper notch has a rear end opening. The rear end opening of the upper notch is used to switch the sliding entrance of the sliding movable plate 23 and the supporting wedge 4. The inner wall of the upper notch is provided with a connecting structure for detachably connecting the movable plate 23. The left flip plate 22... 1. The right flip plate 211 is linked to the moving plate 23; the left fixed plate 222 and the right fixed plate 212 have lower notches on their adjacent sides, and the lower notches have rear end openings. The rear end openings of the lower notches are used for sliding into the sliding entrance of the support wedge 4; it also includes an angle adjustment component 1 for controlling the opening angle of the left expander 22 and the right expander 21. The angle adjustment component 1 includes a housing, a sliding rack, and a drive knob 133; the housing and the sliding rack are respectively fixed to the left side of the left fixed plate 222 and the left flip plate 221 of the left expander 22, or the housing and the sliding rack are respectively fixed to the right side of the right fixed plate 212 and the right flip plate 211 of the right expander 21; the drive knob 133 is installed on the outside of the housing, and the drive knob 133 is connected to the sliding rack 16 through a transmission gear set. The sliding rack 16 is circumferentially slidably connected to the housing.

[0105] This invention, through the combination of the spreading component 2 and the angle adjustment component 1, facilitates controllable spreading angle. The spreading angle is controlled by rotating the drive knob 133. Simultaneously, the notches in the left flip plate 221 and right flip plate 211 are used to switch between the sliding moving plate 23 and the support wedge 4, achieving linkage between the left flip plate 221 and right flip plate 211 during the spreading process. Furthermore, it provides installation space when the support wedge 4 needs to be inserted, facilitating its placement.

[0106] Both the left expander 22 and the right expander 21 are made of metal.

[0107] The hollow mesh design inside the support wedge 4 is manufactured using titanium alloy 3D printing metal additive manufacturing, allowing bone to grow in and improving implant stability.

[0108] See Figures 6-9The angle adjustment assembly 1 also includes a check module for driving the knob 133 to rotate unidirectionally, causing the sliding rack to rise in an arc shape and preventing it from returning in the opposite direction, and an unlocking module for releasing the lock of the check module. The present invention, through the check module and the unlocking module, facilitates locking when raised to a specific angle and resetting the angle. The transmission gear set includes a drive gear 131, which is connected to a drive shaft 132, which is rotatably mounted inside the housing; the check module includes a check wheel 17, which is driven by the knob 133; the check wheel 17 is located inside the housing, and a first spring 19 is sandwiched between the check wheel 17 and the housing; the check wheel 17 is provided with unidirectional meshing teeth; the drive gear 131 is provided with a tooth structure 18 that meshes with the unidirectional meshing teeth. By rotating the drive knob 133 counterclockwise, the check wheel 17 rotates counterclockwise, which in turn drives the drive gear 131 counterclockwise. Due to the engagement of the one-way meshing teeth with the gear tooth structure 18, the counterclockwise rotation of the drive knob 133 increases the opening angle. Clockwise rotation of the drive knob 133 prevents the drive gear 131 from rotating clockwise. Simultaneously, due to the engagement of the one-way meshing teeth with the gear tooth structure 18, the drive gear 131 cannot rotate clockwise, thus preventing the opening angle from turning back. The gear tooth structure 18 includes triangular limiting teeth with increasing axial width in the circumferential direction. The check wheel is provided with a check tooth structure that fits into the gap between adjacent limiting teeth. Both the drive knob 133 and the check wheel 17 have shaft holes for inserting the drive shaft 132.

[0109] The drive knob 133 is provided with a rotating shaft that is rotatably connected to the housing. The rotating shaft has a first limiting groove and a second limiting groove that are axially and internally arranged. The unlocking module includes an elastic locking piece 111. The housing has a groove for the elastic locking piece 111 to slide radially on the drive shaft 132. The elastic locking piece 111 has a through hole for the drive shaft 132 to pass through. The through hole has a limiting protrusion for embedding into the first limiting groove or the second limiting groove. A spring groove is installed at the bottom of the groove. A second spring 110 is installed in the spring groove. The second spring 110 is used to provide the elastic force for the drive shaft 132 to abut against the elastic locking piece 111. When the limiting protrusion is embedded in the first limiting groove, the one-way meshing teeth on the check wheel 17 abut against the gear tooth structure 18 on the drive gear 131. When the limiting protrusion is embedded in the second limiting groove, the one-way meshing teeth on the check wheel 17 are separated from the gear tooth structure 18 on the drive gear 131. The drive shaft 132 is rotatably mounted within a through hole. The through hole is circular. The limiting protrusion is annular. The first limiting groove and the second limiting groove are annular grooves. The inner diameter of the limiting protrusion is larger than the outer diameter of the drive shaft.

[0110] See Figures 10-12The left side of the movable plate 23 is slidably connected to the left side of the notch on the left flip plate 221; the right side of the movable plate 23 is slidably connected to the right side of the notch on the right flip plate 211. The connecting structure is a strip-shaped groove or strip-shaped protrusion with the length direction in the front-back direction. The left flip plate 221 and the right flip plate 211 are inserted left and right; the left fixed plate 222 and the right fixed plate 212 are inserted left and right. The left flip plate 221 and the right flip plate 211 are inserted left and right through mutually cooperating protrusions and grooves; the left fixed plate 222 and the right fixed plate 212 are inserted left and right through mutually cooperating protrusions and grooves. See also Figure 18 .

[0111] See Figures 10-12 A rotating shaft 24 is fixed to the housing; the left flip plate 221 and the left fixed plate 222 are rotatably connected via the rotating shaft 24; the right flip plate 211 and the right fixed plate 212 are rotatably connected via the rotating shaft 24. The left flip plate and the left fixed plate are axially slidably connected to the rotating shaft, facilitating sliding separation to the left. A limiting plate 224 is fixed to the left side of the left flip plate 221, and a first sliding rod 223 is fixed to the rear end of the limiting plate 224. A sliding hole for sliding connection of the first sliding rod 223 is opened at the rear end of the left flip plate 221; a second sliding rod 213 is fixed to the rear end of the right flip plate 211, and the end of the second sliding rod 213 extends out of the right side of the left flip plate 221.

[0112] The housing includes a first housing 12 and a second housing 11 arranged on the left and right sides, forming a cavity to accommodate the transmission gear set. A sliding rack is connected to either the left flip plate 221 or the right flip plate 211 via a transmission rod; an arc-shaped guide groove is provided on the housing for sliding connection of the transmission rod. The transmission rod is the end of the second sliding rod 213 extending from the right flip plate 211. An arc-shaped groove is provided on the housing for the arc-shaped sliding of the sliding rack. The housing has a fan-shaped structure, and an arc-shaped groove is provided on the outer circumference of the housing. The first housing 12 and the second housing 11 are detachably connected.

[0113] See Figure 3 as well as Figure 4 The transmission gear set includes a driving gear 13, a first driven gear 14, and a second driven gear 15. A drive knob 133 is coaxially connected to the driving gear 13. The driving gear 13 meshes with the first driven gear 14, the first driven gear 14 meshes with the second driven gear 15, and the second driven gear 15 meshes with a sliding rack 16. Rotating the drive knob 133 counterclockwise causes the driving gear 13 to rotate counterclockwise, driving the first driven gear 14 to rotate clockwise; this causes the second driven gear 15 to rotate counterclockwise, ultimately resulting in the sliding rack 16 rotating counterclockwise. The drive knob 133 and the sliding rack 16 rotate in the same direction, facilitating the surgeon's operation during surgery.

[0114] The drive knob 133 rotates counterclockwise, which in turn drives the sliding rack 16 to rotate counterclockwise. At this time, the opening angle of the left and right flip plates gradually increases. The transmission ratio of the drive wheel 13, the first driven wheel 14, the second driven wheel 15, and the sliding rack 16 is 7:9:9:140. This achieves a 20° rotation of the drive knob 133, which in turn opens the opening assembly 2 by 1°, allowing for more precise adjustment of the opening angle. The drive gear 131 is connected to the transmission shaft 132 to form the drive wheel 13.

[0115] The first driven wheel 14 includes a first driven shaft 142 and a first driven gear 141 connected together. The first driven shaft 142 is rotatably disposed within the housing. The second driven wheel 15 includes a second driven shaft 152 and a second driven gear 151 connected together. The second driven shaft 152 is rotatably disposed within the housing.

[0116] See Figure 19 The drive knob 133 features circumferentially arranged angle markings to display the opening angle; the housing has a reference alignment line for aligning the angle markings. This allows for easy identification of the opening angle through the angle markings. The drive knob 133 displays a 1° change in opening angle for every 20° increment, with an adjustable angle range of 1° to 15°, providing a wide range for intuitive and precise adjustment of the opening angle. Simultaneously, the opening angle matches the angle of the support wedge 4, which ranges from 4° to 15°, covering actual surgical needs.

[0117] The driving gear 131 has a gear module of 1 and 14 teeth; the first driven gear 14 has a gear module of 1 and 18 teeth; the third driven gear has a gear module of 1 and 18 teeth; the sliding rack 16 has a whole circle module of 1 and a whole circle number of 280 teeth.

[0118] It also includes a fixation assembly for fixing the support wedge 4, which includes a fixation plate 3, fixation nails 6, and tension screws 5; the fixation plate 3 is provided with a contact surface that conforms to the bone surface; the fixation plate and the support wedge 4 are connected by tension screws 5, which are threadedly connected to the support wedge 4; the fixation plate 3 has through holes on both sides of the support wedge 4 for the fixation nails 6 to pass through, and the ends of the fixation nails 6 are provided with threaded holes for implantation into the bone. The thickness of the support wedge 4 decreases from the side adjacent to the fixation plate to the side away from the fixation plate.

[0119] A method for opening and fixing tibial osteotomy, comprising using a device for opening and fixing tibial osteotomy;

[0120] Includes the following steps:

[0121] Step 1: Insert the retractor component 2 into the bone suture formed after the osteotomy of the tibia; see [link / reference] Figure 15 , Figure 16 as well as Figure 17 The structure of the bone sutures formed after osteotomy is described in [reference needed]. Figure 14 .

[0122] Step two, rotate the drive knob 133 to synchronously rotate the left flip plate 221 and the right flip plate 211, adjusting the opening angle; see [link / reference] Figure 20 .

[0123] Step 3: Once the appropriate opening angle is reached, remove the movable plate 23. (See attached image) Figure 21 Switch to the support wedge 4 with the corresponding opening angle; see [link / reference]. Figure 22 The left retractor 22 moves to the left to withdraw from the suture, and the right retractor 21 moves to the right to withdraw from the suture. See also Figure 23 .

[0124] Step 4: Implant the fixation plate, ensuring that fixation plate 3 adheres to the bone surface; see [link / reference] Figure 24 .

[0125] Implant fixation pin 6, which is threaded into the fixation plate; see also Figure 25 .

[0126] A tension screw 5 is inserted, passing through the fixing plate and threadedly engaging with the support wedge 4. See also... Figure 26 .

[0127] The above 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 principle 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 device for spreading and fixing tibial osteotomy, characterized in that, The component includes a spreading assembly, which includes a left spreading member and a right spreading member that are detachably disposed on the left and right sides. The left expander includes a left flip plate and a left fixed plate, and the front end of the left flip plate is hinged to the front end of the left fixed plate. The right expander also includes a right flip plate and a right fixing plate, with the front end of the right flip plate hinged to the front end of the right fixing plate. The left and right flip plates are provided with upper notches on their adjacent sides, and the upper notches are provided with rear openings. The rear openings of the upper notches are used to switch the sliding entrance of the sliding movable plate and the sliding entrance of the support wedge. The inner wall of the upper notches is provided with a connecting structure for detachably connecting the movable plate. The left and right flip plates are linked together through the movable plate. The left and right fixing plates are provided with a lower notch on their adjacent sides. The lower notch is provided with a rear end opening, which is used for the sliding entrance of the support wedge to slide in. It also includes an angle adjustment assembly for controlling the opening angle of the left and right expanders, the angle adjustment assembly including a housing, a sliding rack and a drive knob; The housing and the sliding rack are respectively fixed to the left side of the left fixed plate of the left expander and the left flip plate, or the housing and the sliding rack are respectively fixed to the right fixed plate of the right expander and the right flip plate. The drive knob is mounted on the outside of the housing, and the drive knob is connected to the sliding rack via a transmission gear set.

2. The device for spreading and fixing tibial osteotomy according to claim 1, characterized in that: The angle adjustment assembly also includes a check module for driving the knob to rotate in one direction, causing the sliding rack to rise in an arc shape and preventing it from returning in the opposite direction, and an unlocking module for releasing the lock of the check module.

3. The device for spreading and fixing tibial osteotomy according to claim 2, characterized in that: The transmission gear set includes a drive gear, which is connected to a drive shaft, and the drive shaft is rotatably mounted inside the housing; The check valve module includes a check valve wheel, the drive knob is tractively connected to the check valve wheel, the check valve wheel is located inside the housing, and a first spring is sandwiched between the check valve wheel and the housing; The check wheel is provided with one-way meshing teeth; The drive gear is provided with a tooth structure that meshes with the one-way meshing teeth.

4. The device for spreading and fixing tibial osteotomy according to claim 3, characterized in that: The drive knob is provided with a rotating shaft that is rotatably connected to the housing. The rotating shaft is provided with a first limiting groove and a second limiting groove that are axially and internally arranged. The unlocking module includes an elastic locking piece, and the housing has a groove for the elastic locking piece to slide radially on the transmission shaft; The elastic locking piece has a through hole for the transmission shaft to pass through, and a limiting protrusion for embedding into the first limiting groove or the second limiting groove is provided in the through hole; A spring groove is installed at the bottom of the slide, and a second spring is installed in the spring groove. The second spring is used to provide the elastic force for the drive shaft to abut against the elastic locking piece. When the limiting protrusion is embedded in the first limiting groove, the one-way meshing teeth on the anti-return wheel abut against the gear teeth on the drive gear; When the limiting protrusion is embedded in the second limiting groove, the one-way meshing teeth on the anti-return wheel are separated from the gear teeth on the drive gear.

5. The device for spreading and fixing tibial osteotomy according to claim 1, characterized in that: The left side of the movable plate is slidably connected to the left side of the notch on the left flip plate; The right side of the movable plate is slidably connected to the right side of the notch on the right flip plate.

6. The device for spreading and fixing tibial osteotomy according to claim 1, characterized in that: The left and right flip plates are connected by interlocking protrusions and grooves. The left and right fixing plates are connected by interlocking protrusions and grooves.

7. The device for spreading and fixing tibial osteotomy according to claim 1, characterized in that: The housing includes a first housing and a second housing arranged on the left and right sides, and the first housing and the second housing form a cavity for accommodating the transmission gear set.

8. The device for spreading and fixing tibial osteotomy according to claim 1, characterized in that: The housing is provided with an arc-shaped groove for the sliding rack to slide in an arc shape; The shell has a fan-shaped structure, and the arc-shaped groove is provided on the outer circumference of the shell.

9. The device for spreading and fixing tibial osteotomy according to claim 1, characterized in that: The transmission gear set includes a driving gear, a first driven gear, and a second driven gear. The drive knob is coaxially connected to the driving gear. The driving gear meshes with the first driven gear, the first driven gear meshes with the second driven gear, and the second driven gear meshes with the sliding rack. The transmission ratio of the driving wheel, the first driven wheel, the second driven wheel, and the sliding rack is 7:9:9:140.

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