An instrument for zygomatic bone reduction surgery

Abstract

The present invention discloses an instrument for zygomatic bone reduction surgery, comprising a reduction rod, a handle, and a support structure; the support structure is connected to the first end of the reduction rod; the first end of the reduction rod is connected to the first end of the handle; the reduction rod and the handle form an angle whose opening direction is opposite to the direction of the support structure; the second end of the reduction rod is slender; and the second end of the handle includes a hand-held portion. The present invention utilizes the principle of a lever to construct a fulcrum, which amplifies the force applied by the doctor to the handle and transmits it to the zygomatic bone fracture fragment, so as to facilitate the conduction of force and make it easier to pull out or pry out the fracture fragment. In addition, the present invention constructs the fulcrum of the instrument outside the body to avoid causing harm to the patient's body when applying force.

Description

Technical Field

[0001] The present invention relates to the field of medical instruments, and in particular to an instrument used for zygomatic bone reduction surgery. Background Art

[0002] Zygomatic bone fractures are common maxillofacial injuries. The force causing the injury primarily displaces the zygomatic bone inward, backward, or downward, and may also cause rotational displacement, resulting in collapse and deformity of the zygomatic process. Following facial fractures, many patients experience symptoms such as orbital sunkenness, orbital rim step deformity, retrobulbar eyeballs, limited mouth opening, and facial asymmetry. These symptoms can even cause difficulty eating, severely impacting their quality of life.

[0003] like Figure 1 As shown in the figure, since the zygomatic bone is an irregular bone, it is connected to the maxilla internally, the frontal bone above, the temporal bone of the zygomatic arch, and the greater wing of the sphenoid bone posteriorly. Therefore, ideal zygomatic fracture reduction requires that all the above-mentioned displaced areas are well aligned, that is, the four ends of the maxillary bone, frontal bone, temporal bone, and greater wing of the sphenoid bone are all reduced at the same time to achieve better anatomical reduction and functional recovery.

[0004] Currently, the tools used in clinical practice for zygomatic body fracture reduction primarily rely on retractors or crowbars. These retractors are inserted into the inner side of the outer lower orbital margin, the posterior and lateral sides of the orbit, or the corner between the zygomatic bone and the zygomaticoalveolar support, to pull or pry out the indented zygomatic bone and then fix it. While these tools have some effectiveness, they also have the following disadvantages:

[0005] 1) The use of retractors or crowbars lacks a good fulcrum and cannot provide leverage for force transmission. The force of prying the zygomatic body is difficult to transmit to the zygomatic body, and the reduction force is weakened, making it difficult to achieve zygomatic reduction.

[0006] 2) Patent CN201220215587.4 discloses a medical maxillary surgical retractor. The retractor or crowbar has a single force application mode and a single point of action, making it difficult to apply three-dimensional reverse force to the zygomatic body. That is, it is difficult to apply outward, forward, and upward force to the zygomatic body, and it is even more difficult to apply reverse rotational force to the zygomatic body.

[0007] 3) Patent 202021479291.4 discloses an H-shaped zygomatic arch fracture reduction forceps, which reduces the zygomatic bone fracture part through an intraoral incision. The surgical field of view is small and the deep surgical area is difficult to fully expose. The surgical process is subject to certain limitations, and the maxillary gums and other parts need to be used as force fulcrums, which can easily cause secondary damage to the patient and the wound formed is large.

[0008] 4) In the area where the zygomatic bone and maxilla are adjacent, because the bone wall of the maxillary sinus is very thin, it is difficult to use normal prying force to reposition the zygomatic maxillary process of the inward-moved zygomatic bone, which may cause the maxillary wall to rupture and form new fracture fragments. In the area where the zygomatic bone and frontal bone are adjacent, because the eyeball is located in the orbital wall and the inner side of the orbital wall is smooth, there is no place to apply prying force to reposition the displaced zygomatic frontal process. As for the displacement of the zygomatic bone, the general lifting method can only reposition the outer shape of the zygomatic arch, but cannot completely reposition the zygomatic bone as a whole. Inaccurate repositioning often brings great difficulties to the final zygomatic fixation.

[0009] Therefore, it is often difficult to accurately reposition the broken ends of the zygomatic body during surgery. With the development of society, people have higher and higher requirements for facial appearance and health, and traditional surgical reduction instruments can no longer meet the needs of doctors and patients. Summary of the Invention

[0010] The purpose of the present invention is to provide a zygomatic bone reduction surgical instrument with adjustable angle and torque effect.

[0011] In order to achieve the above-mentioned object, the present invention provides an instrument for zygomatic bone reduction surgery, comprising a reduction rod, a handle and a support structure;

[0012] The support structure is connected to the first end of the reset rod;

[0013] The first end of the reset rod is connected to the first end of the handle;

[0014] The reset rod and the handle form an angle in which the opening direction is opposite to the direction of the support structure;

[0015] The second end of the reset rod is elongated;

[0016] The second end of the handle includes a hand grip.

[0017] Optionally, the first end of the reset rod is rotatably connected to the first end of the handle.

[0018] Optionally, the first end of the reset rod comprises a cylindrical structure, the first end of the handle comprises an arc groove, and the inner surface of the arc groove is adapted to the outer circumferential surface of the cylindrical structure;

[0019] The inner surface of the arc groove fits the outer circumference of the cylindrical structure, so that the handle can rotate axially along the outer circumference of the cylindrical structure and around the central axis of the cylindrical structure.

[0020] Optionally, it further comprises a gear slider, wherein the gear slider comprises a gear, a disc, a slider and a first screw connected in sequence;

[0021] The cylindrical structure includes a first side surface, and a tooth groove is provided in the cylindrical structure. The tooth groove is close to the first side surface and is arranged along the circumferential direction in the cylindrical structure, and the tooth groove is adapted to the gear teeth of the gear;

[0022] The first end of the handle includes a handle side wall, the handle side wall is arranged corresponding to the first side surface, and a slider hole adapted to the shape of the slider is opened on the handle side wall;

[0023] The gear slider can be inserted into the cylindrical structure from the first side surface so that the gear teeth are engaged with the tooth grooves, and the slider is located in the slider hole.

[0024] Optionally, it further includes a first spring and a first nut;

[0025] The first end of the first spring abuts against the inner surface of the side wall of the handle, and the second end of the first spring abuts against the outer side surface of the disc;

[0026] The first nut is connected to the first screw rod.

[0027] Optionally, a disc groove is provided on the outer side surface of the disc along the circumferential direction, and the second end of the first spring is placed in the disc groove.

[0028] Optionally, it further includes a second screw and a fixed stop;

[0029] The cylindrical structure includes a second side surface, the handle includes a third side surface, the second side surface and the third side surface are located in the same plane, and the fixed stopper is provided corresponding to the second side surface and connected to the third side surface;

[0030] A cylindrical through hole is opened along the central axis direction of the cylindrical structure, a block through hole is opened on the fixed block corresponding to the cylindrical through hole, and the second screw is inserted into the block through hole and the cylindrical through hole in sequence to fix the reset rod and the handle in connection.

[0031] Optionally, the second screw includes a first screw portion and a second screw portion, and the cylindrical through hole includes a first through hole portion and a second through hole portion;

[0032] The first screw portion is located in the first through hole portion and is threadedly connected to the first through hole portion;

[0033] The second screw portion is located in the second through hole portion.

[0034] Optionally, it further comprises a second spring, a tapered sleeve and a second nut sequentially sleeved outside the second screw portion;

[0035] The outer diameter of the second screw portion is smaller than the diameter of the second through hole portion, so that the second spring is located between the second screw portion and the second through hole portion;

[0036] The stopper through hole comprises a tapered hole with a diameter increasing from the inside to the outside, wherein the smallest diameter of the tapered hole is the same as the diameter of the second through hole portion; the outer diameter of the tapered sleeve is adapted to the tapered hole, so that the tapered sleeve is located between the second screw portion and the tapered hole;

[0037] The second nut is located outside the tapered sleeve.

[0038] Optionally, the second end of the reset rod includes a separation structure, the end surface of the separation structure is semicircular, and the upper surface of the separation structure is a curved surface.

[0039] The beneficial effects of the present invention are:

[0040] (1) The present invention utilizes the principle of leverage to construct a fulcrum, amplifying the force applied by the doctor to the handle and transmitting it to the zygomatic bone fragment, thereby facilitating the transmission of force and making it easier to pull or pry out the fragment. Compared with existing retractors or crowbars, the doctor can pry the zygomatic bone with less force. In addition, the present invention constructs the fulcrum of the instrument outside the body to avoid damage to the patient's body when applying force.

[0041] (2) The present invention uses the gear fitting principle to enable the reduction rod and the handle to rotate relative to each other, and the angle between the reduction rod and the handle is adjustable. In surgeries on different parts of the maxillofacial region, the appropriate angle is set according to the patient's specific situation to achieve the optimal force application effect, facilitate surgical operations, and improve surgical effects and safety: in the absence of a suitable force fulcrum, the angle is adjusted to a smaller value, and the force applied to the fracture fragment is applied through a lifting force mode. At this time, there is no energy loss in mechanical conduction, and the force applied to the handle can be transmitted to the fracture fragment in equal amounts; in the presence of a suitable force fulcrum, the angle is adjusted to a larger value, and the force applied to the fracture fragment is applied through a lever force mode. The power applied to the handle is multiplied, reducing the doctor's physical exertion.

[0042] (3) The second end of the reduction rod is designed to be a curved surface that matches the shape of the posterior support of the zygomatic body. Unlike the traditional retractor that contacts the zygomatic bone at a “point” or “line”, it achieves contact with the posterior support of the zygomatic body at a “surface”. Therefore, it can better pull the zygomatic body upward, forward, and outward, and can also give the zygomatic body a certain degree of rotational force. Figure 12 and Figure 13 As shown, only a small incision is needed on the inner side of the outer upper edge of the orbit for reduction treatment, without the need for multiple incisions on the skin tissue around the cheekbone, thus avoiding unnecessary damage to the victim's facial appearance.

[0043] (4) The present invention utilizes the wedge-shaped structure principle of the tapered sleeve, the spring force and the threaded connection method to achieve the effects of locking and backstopping, thereby improving the safety of the device.

[0044] (5) The present invention is made of high-quality medical stainless steel material, with a reasonable structure, simple operation, stability and reliability, and easy use; the surface of the present invention is smooth and easy to clean, which can effectively avoid cross infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Schematic diagram of the zygomatic bone, where (a) is the anterior-lateral view of the zygomatic bone (left side) and (b) is the posterior-lateral view of the zygomatic bone.

[0046] Figure 2 This is a schematic diagram of the instrument used for zygomatic bone reduction surgery according to the present invention in a small angle state.

[0047] Figure 3 This is a schematic diagram of the instrument used for zygomatic bone reduction surgery according to the present invention in a large angle state.

[0048] Figure 4 Schematic diagram of the structure of the reset rod of the present invention.

[0049] Figure 5 This is a second side view of the cylindrical structure of the present invention.

[0050] Figure 6 Schematic diagram of the handle structure of the present invention.

[0051] Figure 7 This is a cross-sectional view of the instrument used for zygomatic bone reduction surgery according to the present invention.

[0052] Figure 8 It is a structural schematic diagram of the gear slider of the present invention.

[0053] Figure 9 This is a structural schematic diagram of the gear slider of the present invention from another perspective.

[0054] Figure 10 It is a structural schematic diagram of the fixed stopper of the present invention.

[0055] Figure 11 This is a structural schematic diagram of the fixed stopper of the present invention from another perspective.

[0056] Figure 12 This is a schematic diagram of the use of the instrument for zygomatic bone reduction surgery according to the present invention.

[0057] Figure 13 This is a schematic diagram of another usage state of the instrument for zygomatic bone reduction surgery according to the present invention.

[0058] In the figure, 1-reset rod, 10-cylindrical structure, 101-first side surface, 102-tooth groove, 103-tooth groove spacing surface, 104-tooth groove center surface, 105-circumferential hole surface, 106-second side surface, 107-first through hole portion, 108-second through hole portion, 109-outer peripheral surface, 11-separation structure, 110-end surface, 12-support structure, 2-handle, 201-fourth side surface, 202-fixed stopper mounting hole, 203-third side surface, 204-arc groove, 205-handle side wall, 206-slide Block hole, 207-handle part, 3-gear slider, 31-gear, 311-gear tooth, 312-tooth top surface, 313-tooth root surface, 32-disc, 320-circular shaft surface, 321-disc groove, 33-slider, 34-first screw, 4-first nut, 5-first spring, 6-second screw, 7-second spring, 8-fixed stop, 801-countersunk hole, 802-tapered hole, 803-inner hole, 804-fixed stop side, 805-fixed stop inner surface, 9-tapered sleeve, 10-second nut. DETAILED DESCRIPTION

[0059] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0060] In the description of the present invention, it should be noted that the terms "inside" and "outside" are based on the instrument for zygomatic bone reduction surgery of the present invention, with the direction close to the instrument being "inside" and the direction away from the instrument being "outside"; the directions or positional relationships indicated by the terms "upper," "lower," "left," "right," "vertical," and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0062] like Figure 2-Figure 11As shown, the present invention provides an instrument for zygomatic bone reduction surgery, comprising a reduction rod 1, a handle 2 and a support structure 12. The support structure 12 is connected to the first end of the reduction rod 1; the first end of the reduction rod 1 is connected to the first end of the handle 2; the reduction rod 1 and the handle 2 form an angle whose opening direction is opposite to the direction of the support structure 12; the second end of the reduction rod 1 is slender; the second end of the handle 2 includes a hand-held portion 207. The first end of the reduction rod 1 is rotatably connected to the first end of the handle 2 to adjust the size of the angle formed by the reduction rod 1 and the handle 2. Optionally, the angle ranges from 12° to 60°. The support structure 12 provides a fulcrum for the instrument. Optionally, the support structure 12 is a sheet-like structure, which makes the support area larger and the support effect more stable.

[0063] The first end of the reset rod 1 includes a cylindrical structure 10 . The cylindrical structure 10 includes a first side surface 101 , a second side surface 106 , and an outer peripheral surface 109 . The first side surface 101 and the second side surface 106 are disposed on both sides of the outer peripheral surface 109 .

[0064] The first end of the handle 2 includes an arc groove 204, the inner surface of the arc groove 204 is adapted to the outer circumferential surface 109 of the cylindrical structure 10; the inner surface of the arc groove 204 fits the outer circumferential surface 109 of the cylindrical structure 10, so that the handle 2 can rotate axially along the outer circumferential surface 109 of the cylindrical structure 10 and around the central axis of the cylindrical structure 10.

[0065] In order to realize the rotatable connection between the reset rod 1 and the handle 2, the angle formed by the two can be adjusted step by step and the reset rod 1 and the handle 2 can be kept relatively fixed at a specific angle, such as Figure 8 and Figure 9 As shown, the apparatus of the present invention further comprises a gear slider 3, which comprises a gear 31, a disc 32, a slider 33 and a first screw 34 connected in sequence. Figure 8 Schematic diagram of the structure of the gear slider 3 shown from the perspective of the gear 31 to the first screw 34. Figure 9 Schematic diagram of the structure of the gear slider 3 shown from the perspective of observing the gear 31 from the first screw 34.

[0066] The cylindrical structure 10 is provided with a plurality of tooth grooves 102, located adjacent to the first side surface 101 and arranged circumferentially within the cylindrical structure 10. These tooth grooves 102 mate with the gear teeth 311 of the gear 31. The gear slider 3 can be inserted into the cylindrical structure 10 from the first side surface 103, meshing the gear teeth 311 of the gear 31 with the tooth grooves 102. Optionally, 15 tooth grooves 102 are uniformly arranged, with the angle between adjacent tooth grooves 104 being 24°. The number of teeth 311 is also uniformly arranged at 15.

[0067] When the gear 311 is meshed with the tooth groove 102:

[0068] (1) The tooth top surface 312 of the gear 31 fits in with the tooth groove center surface 104 of the cylindrical structure 10; the tooth root surface 313 of the gear 31 fits in with the tooth groove spacing surface 103 of the cylindrical structure 10. The tooth root surface 313 of the gear 31 is the inner side surface of the disk 32, that is, the connection surface between the gear 31 and the disk 32. The tooth top surface 312 of the gear 31 is the opposite surface of the tooth root surface 313, that is, the side of the gear slider 31 close to the cylindrical structure 10. After the plurality of tooth grooves 102 are evenly arranged circumferentially in the cylindrical structure 10, the plane connecting the two adjacent tooth grooves 102 is the tooth groove spacing surface 103. The plurality of tooth grooves 102 form a tooth groove center surface 104, which is recessed toward the inner side of the cylindrical structure 10 to leave space for the gear 31 to be inserted.

[0069] (2) The axial surface 320 of the disc 32 is in contact with the circumferential hole surface 105 of the cylindrical structure 10. The circumferential hole surface 105 is connected between the tooth groove spacing surface 103 and the first side surface 101.

[0070] The first end of the handle 2 includes a handle sidewall 205, which corresponds to the first side surface 101. A slider hole 206 is defined in the handle sidewall 205, matching the shape of the slider. After the gear slider 3 is inserted into the cylindrical structure 10, the slider 33 is positioned within the slider hole 206. The slider 33 is capable of sliding within the slider hole 206 along the axial direction of the first screw. The slider 33 has a predetermined length along the axial direction of the first screw. During use, whether tension is applied to the first nut 4 or released (described in detail below), the slider 33 remains within the slider hole 206. The slider 33 is shaped like a "convex" (convex) character. When the first nut 4 is subjected to force, the handle 2 rotates. Within the constraints of the slider hole 206, the handle 2 drives the gear slider 3, causing it to rotate along with the handle 2. Relative motion between the handle 2 and the gear slider 3 is prevented.

[0071] A first spring 5 is disposed between the handle 2 and the gear slider 3. The first end of the first spring 5 contacts the inner surface of the handle sidewall 205, and the second end of the first spring 5 contacts the outer surface of the disc, i.e., the connection surface between the slider 33 and the disc 32. Optionally, a disc groove 321 is defined along the circumference of the outer surface of the disc, with the second end of the first spring 5 positioned within the disc groove 321. A first nut 4 is threadedly connected to the first screw 34, securing the interconnection between the reset lever 1, the handle 2, the gear slider 3, and the spring 5. Optionally, the first nut 4 is a butterfly nut.

[0072] When the gear teeth 311 are engaged with the tooth groove 102, the first nut 4 is pulled outward, and the first nut 4 drives the gear slider 3, so that the gear 311 is pulled out of the tooth groove 102. The first spring 5 located between the handle side wall 205 and the disc groove 321 is compressed, maintaining the force applied to the first nut 4. The handle 2 is rotated, and the handle 2 drives the gear slider 3 to rotate through the slider hole 206. After reaching a suitable angle, the tension applied to the first nut 4 is released, and the compressed first spring 5 rebounds. The rebound force pushes the gear teeth 311 of the gear slider 3 into the tooth groove 102 of the reset rod 1, forming a new angle between the handle 2 and the reset rod 1.

[0073] The handle 2 includes a third side surface 203, which is opposite the handle side wall 205. The third side surface 203 and the handle side wall 205 are respectively disposed on opposite sides of the handle 2. When the reset lever 1 is connected to the handle 2, the third side surface 203 of the handle 2 and the second side surface 106 of the cylindrical structure 10 are located in the same plane and are flush with each other.

[0074] like Figure 10 and Figure 11 As shown, Figure 10 This is a schematic structural diagram of the fixed stopper 8 viewed from the outside to the inside. Figure 11 The diagram shows the structure of the fixed block 8, viewed from the inside out. The fixed block 8 is positioned relative to the second side 106 of the cylindrical structure 10 and is connected to the third side 203 of the handle 2. After connection, the inner surface 805 of the fixed block aligns with the third side 203 of the handle 2, and the side surface 804 of the fixed block aligns with the fourth side 201 of the handle 2. Optionally, three fixed block mounting holes 202 are defined on the third side 203, and three countersunk holes 801 are defined on the fixed block 8 corresponding to the fixed block mounting holes 202. After the countersunk holes 801 are aligned with the fixed block mounting holes 202, the handle 2 and the fixed block 8 are fixedly connected using screws. A cylindrical through hole is opened along the central axis direction of the cylindrical structure 10, and a block through hole is opened on the fixed stopper 8 corresponding to the cylindrical through hole. The cylindrical through hole and the block through hole have the same axis. The second screw can pass through the block through hole and the cylindrical through hole in sequence to connect the fixed stopper 8 with the reset rod 1, and then connect the reset rod 1 with the handle 2.

[0075] In some embodiments, the cylindrical through hole includes a first through hole portion 107 and a second through hole portion 108, and the second screw 6 includes a first screw portion and a second screw portion, the first screw portion is located in the first through hole portion 107 and is threadedly connected to the first through hole portion; the second screw portion is located in the second through hole portion 108.

[0076] The second spring 7, tapered sleeve 9, and second nut 11 are sequentially sleeved over the second screw portion. The outer diameter of the second screw portion is smaller than the diameter of the second through-hole portion 108, positioning the second spring 7 between the second screw portion and the second through-hole portion 108. The block through-hole comprises an inner hole 803 and a tapered hole 802, extending from the inside outward. The diameter of the inner hole 803 is the same as the diameter of the second through-hole portion 108. Part of the second spring 7 is located within the second through-hole portion 108, while part of the second spring 7 is located within the inner hole 803. The diameter of the tapered hole 802 increases from the inside outward, with the smallest diameter of the tapered hole 802 being the same as the diameter of the inner hole 803. The outer diameter of the tapered sleeve 9 matches the tapered hole 802, positioning it between the second screw portion and the tapered hole 802. The second nut 11 is located outside the tapered sleeve 9. Optionally, the second nut 11 is a butterfly nut.

[0077] Therefore, the outer conical surface of the tapered sleeve 9 fits with the tapered hole 802 of the fixed block 8, and the second nut 11 and the second screw 6 are screwed together to play a locking role, so that the second screw 6 fixes and locks the reset rod 1 and the handle 2.

[0078] In some embodiments, the second end of the reduction rod 1 includes a separation structure 11. The end surface 110 of the separation structure 11 is semicircular. When contacting facial soft tissue, the end surface 110 can reduce friction during tissue separation. The upper surface of the separation structure 11 is curved. Based on a scanned simulation of the morphology of the posterior strut of the zygomatic body, this curved surface is designed to conform to the physiological curve of the posterior strut of the zygomatic body. This allows the reduction rod 1 of the present invention to achieve "surface" contact with the posterior strut of the zygomatic body, unlike traditional retractors that only contact the zygomatic bone at a "point" or "line." This allows for upward, forward, and outward traction of the zygomatic body and a certain degree of rotational force on the zygomatic body.

[0079] In some embodiments, the hand-grip portion 207 of the handle 2 is designed with a circle of teeth, which can greatly increase the friction between the hand and the gripping structure during the force application process, facilitate holding, and greatly optimize the force application effect.

[0080] When in use, an angle is formed between the reset rod 1 and the handle 2, the gear teeth 311 are engaged with the tooth grooves 102, and the gear slider 3 does not rotate relative to the reset rod 1 and the handle 2; the fixed stopper 8 is fixedly connected to the handle 2, the second screw 6 passes through the cylindrical through hole and the stopper through hole, and the end face of the tapered sleeve 9 with the smallest outer diameter contacts and squeezes the second spring 7. The second spring 7 is in a compressed state and has a tendency to push the tapered sleeve 9 out of the tapered hole 802, but the second nut 11 threadedly connected to the second screw 6 contacts the end face of the tapered sleeve 9 with the largest outer diameter, so that the tapered sleeve 9 is located in the tapered hole 802, ensuring that the fixed stopper 8 is fixedly connected to the reset rod 1, thereby connecting and locking the reset rod 1 to the handle 2.

[0081] The angle adjustment method of the present invention comprises:

[0082] Step 1: Unlock the reset lever 1 and the handle 2.

[0083] The second nut 11 is rotated so that the second nut 11 no longer interferes with the tapered sleeve 9. Under the elastic force of the second spring 7, the tapered sleeve 9 is pushed out of the tapered hole 802, and the second spring 7 is in a free state.

[0084] At this time, since the first screw portion is threadedly connected to the first through-hole portion, the second screw 6 is still located in the cylindrical through-hole, but the outer conical surface of the tapered sleeve 9 no longer fits the tapered hole 802, and the inner diameter of the block through-hole is smaller than the outer diameter of the second screw portion. The fixed block 8 and the handle 2 connected thereto can move relative to the reset rod 1, and the reset rod 1 and the handle 2 are unlocked.

[0085] Step 2: The gear slider 3 is separated from the reset rod 1.

[0086] Pulling the first nut 4 drives the gear slider 3 to move outward along the axis of the first screw 34, and the gear teeth 311 of the gear slider 3 are pulled out from the tooth groove 102, and the gear slider 3 is disengaged from the reset rod 1, and the first spring 5 is in a compressed state.

[0087] Step 3: Turn the handle 2 to a suitable angle.

[0088] Maintaining the tension applied to the first nut 4, the handle 2 is rotated, causing the inner surface of the arc groove 204 to move axially along the outer circumferential surface 109 of the cylindrical structure 10 and around the central axis of the cylindrical structure 10. Restricted by the slider hole 206, the handle 2 can drive the slider 33, and thus the gear slider 3, causing the gear slider 3 to rotate along with the handle 2 until the handle 2 and the reset rod 1 form a new appropriate angle. During this process, the handle 2 and the gear slider 3 do not move relative to each other.

[0089] When the nut 4 is rotated to a suitable angle, the tension applied to the first nut 4 is released, and the compressed first spring 5 rebounds. The rebound force pushes the gear teeth 311 of the gear slider 3 into the tooth groove 102 of the reset rod 1 .

[0090] Step 4: Lock the reset lever 1 and the handle 2.

[0091] Push the tapered sleeve 9 into the tapered hole 802 , continue to compress the second spring 7 , and then re-tighten the second nut 11 on the second screw rod 6 to lock the reset rod 1 and the handle 2 .

[0092] Since the angle between the reset lever 1 and the handle 2 of the present invention is adjustable, the present invention has two usage methods:

[0093] Method 1: If Figure 2 As shown, when there is no suitable force fulcrum during the operation, the angle between the reduction rod 1 and the handle 2 is adjusted to a smaller angle, so that the upper surface of the separation structure 11 of the reduction rod 1 is aligned with the indented fracture fragment, and the hand-held portion 207 of the handle 2 is held to generate a lifting force to pull out the indented fracture fragment.

[0094] Method 2: If Figure 3 As shown, when a suitable fulcrum for applying force is found during surgery, the angle between reduction rod 1 and handle 2 is adjusted to a larger angle, so that the upper surface of separation structure 11 of reduction rod 1 aligns with the invaginated fracture fragment, and support structure 12 aligns with the fulcrum, forming a lever model. Gripping handle 2 by hand portion 207 generates a lifting force, which multiplies the force applied to handle 2, increasing the force exerted by reduction rod 1 on the zygomatic fracture fragment and significantly reducing the surgeon's physical exertion. Angle adjustment also solves problems such as insufficient operating space, allowing for personalized surgical procedures for patients and improving surgical outcomes.

[0095] In summary, the present invention provides an instrument for zygomatic bone reduction surgery, including a reduction rod, a handle and a support structure, wherein the support structure is connected to the first end of the reduction rod, and the first end of the reduction rod is connected to the first end of the handle. The reduction rod, the handle and the support structure together constitute a lever structure. By utilizing the principle of leverage and taking the support structure as a fulcrum, the force applied by the doctor on the handle is amplified and transmitted to the reduction rod, thereby lifting the zygomatic bone fracture fragment to facilitate the conduction of force and make it easier to pull out or pry out the fracture fragment. In addition, the present invention constructs the fulcrum of the instrument outside the body to avoid causing harm to the patient's body when applying force. The reduction rod and the handle of the present invention adopt a rotatable and adjustable design, and can be adjusted in angle according to the specific situation of the patient. The lifting force or lever force can be applied according to the adjustment angle, and the surgical procedure can be customized for the patient, thereby improving the surgical effect and safety.

[0096] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. An instrument for zygomatic bone reduction surgery, characterized in that: Includes reset lever, grip, support structure and gear slider; The support structure is connected to the first end of the reset rod; The first end of the reset rod is connected to the first end of the handle; the first end of the reset rod includes a cylindrical structure, and the first end of the handle includes an arc groove, the inner surface of the arc groove is adapted to the outer circumference of the cylindrical structure; the inner surface of the arc groove fits the outer circumference of the cylindrical structure, so that the handle can axially rotate along the outer circumference of the cylindrical structure and around the central axis of the cylindrical structure; The gear slider includes a gear, a disc, a slider and a first screw connected in sequence; the cylindrical structure includes a first side surface, and a tooth groove is provided in the cylindrical structure, the tooth groove is close to the first side surface and is arranged circumferentially in the cylindrical structure, and the tooth groove is adapted to the gear teeth of the gear; the first end of the handle includes a handle side wall, the handle side wall is arranged corresponding to the first side surface, and a slider hole adapted to the shape of the slider is opened on the handle side wall; the gear slider can be inserted into the cylindrical structure from the first side surface so that the gear teeth engage with the tooth groove, and the slider is located in the slider hole; The reset rod and the handle form an angle in which the opening direction is opposite to the direction of the support structure; The second end of the reset rod is elongated; The second end of the handle includes a hand grip.

2. The instrument for zygomatic bone reduction surgery according to claim 1, characterized in that: Also included is a first spring and a first nut; The first end of the first spring abuts against the inner surface of the side wall of the handle, and the second end of the first spring abuts against the outer side surface of the disc; The first nut is connected to the first screw rod.

3. The instrument for zygomatic bone reduction surgery according to claim 2, characterized in that: A disc groove is provided on the outer side surface of the disc along the circumferential direction, and the second end of the first spring is placed in the disc groove.

4. The instrument for zygomatic bone reduction surgery according to claim 1, characterized in that: Also includes a second screw and a fixed stop; The cylindrical structure includes a second side surface, the handle includes a third side surface, the second side surface and the third side surface are located in the same plane, and the fixed stopper is provided corresponding to the second side surface and connected to the third side surface; A cylindrical through hole is opened along the central axis direction of the cylindrical structure, a block through hole is opened on the fixed block corresponding to the cylindrical through hole, and the second screw is inserted into the block through hole and the cylindrical through hole in sequence to fix the reset rod and the handle in connection.

5. The instrument for zygomatic bone reduction surgery according to claim 4, characterized in that: The second screw includes a first screw portion and a second screw portion, and the cylindrical through hole includes a first through hole portion and a second through hole portion; The first screw portion is located in the first through hole portion and is threadedly connected to the first through hole portion; The second screw portion is located in the second through hole portion.

6. The instrument for zygomatic bone reduction surgery according to claim 5, characterized in that: It also includes a second spring, a tapered sleeve and a second nut which are sequentially sleeved outside the second screw portion; The outer diameter of the second screw portion is smaller than the diameter of the second through hole portion, so that the second spring is located between the second screw portion and the second through hole portion; The stopper through hole comprises a tapered hole with a diameter increasing from the inside to the outside, wherein the smallest diameter of the tapered hole is the same as the diameter of the second through hole portion; the outer diameter of the tapered sleeve is adapted to the tapered hole, so that the tapered sleeve is located between the second screw portion and the tapered hole; The second nut is located outside the tapered sleeve.

7. The instrument for zygomatic bone reduction surgery according to claim 1, characterized in that: The second end of the reset rod includes a separation structure, the end surface of the separation structure is semicircular, and the upper surface of the separation structure is a curved surface.

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