An internal fixation device for cancellous bone

Abstract

This invention provides an internal fixation device for cancellous bone, belonging to the field of medical device technology. It includes a fixation plate with a plurality of screw holes and positioning holes arranged in a linear array on its top outer wall; and a guide assembly connected to the fixation plate, used to guide the hollow self-drilling screws. By incorporating the guide assembly, this invention not only guides the hollow self-drilling screws, preventing them from deviating from their pre-operatively assessed position during insertion, thus affecting their fixation effect on the fracture site, but also holds the screws during the guiding process, preventing the screw head from tilting and protruding, which could cause skin irritation and affect postoperative recovery.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an internal fixation device for cancellous bone. Background Technology

[0002] Internal fixation of cancellous bone refers to the technique of fixing cancellous bone using specific internal fixation devices (such as cancellous bone screws, plates, intramedullary nails, etc.) during fracture or other orthopedic surgeries. This procedure is often used for fracture fixation in elderly patients because their bones are relatively porous and require special screw fixation.

[0003] Currently, during fracture fixation surgery for osteoporosis patients, a fixation plate is placed in the fracture area, and then cancellous bone screws are inserted. The screw insertion process requires drilling a hole before screwing it in. This drilling process results in some bone loss, and solid screws do not have good biocompatibility with bone; therefore, hollow self-tapping screws are used for fixation.

[0004] However, during the screw-in process, a guide is used to guide the screw to ensure it doesn't deviate from its intended position. Currently, a commonly used guide is a metal tube that fits the screw size. Because the diameters at both ends of the screw are different, even with the guidance of the metal tube, the screw can still tilt, causing the screw head to protrude and leading to skin irritation.

[0005] Therefore, the present invention provides an internal fixation device for cancellous bone to meet the requirements. Summary of the Invention

[0006] The technical problem this invention aims to solve is to provide a cancellous bone internal fixation device that, through the inclusion of a guide component, not only guides the hollow self-tapping screw, preventing it from deviating from the pre-operatively assessed position during insertion and thus affecting its fixation effect on the patient's fracture site, but also holds the hollow self-tapping screw during the guiding process. This prevents the screw head from protruding due to tilting, which could cause skin irritation and affect postoperative recovery. Furthermore, the guide component facilitates the placement of the hollow self-tapping screw, and during screw insertion, the surgeon can place the fixation plate at the patient's fracture site without the need for an assistant, improving the surgeon's work efficiency. These features effectively solve the problem of screw head protrusion due to tilting, which can lead to skin irritation.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] An internal fixation device for cancellous bone includes a fixation plate. The top outer wall of the fixation plate is provided with a plurality of screw holes and a plurality of positioning holes. The plurality of screw holes and the plurality of positioning holes are arranged in a linear array. A guide component is connected to the fixation plate and guides the hollow self-drilling screws.

[0009] Optionally, the guide assembly includes a positioning post inserted into the positioning hole, one end of the positioning post being fixedly connected to a guide cylinder, square clearance holes being symmetrically formed on the outer wall of the guide cylinder near the bottom end, a first clearance groove being symmetrically formed on the inner wall of the guide cylinder near the top end, a second clearance groove being formed on the inner wall of the guide cylinder near the bottom end, and a first sliding groove being symmetrically formed on the inner wall of the guide cylinder near the middle.

[0010] Optionally, two sets of first elastic plates are symmetrically fixedly connected to the outer wall of the guide cylinder near the bottom end. There are four first elastic plates in total, divided into two groups. Each set of two first elastic plates is fixedly connected to a clamping plate. A first abutting block is fixedly connected to the outer wall of the clamping plate near the guide cylinder. A support rod is fixedly connected to the outer wall of the guide cylinder near the top end. A second sliding groove is symmetrically opened on the outer wall of the support rod near the middle. A circular clearance channel is opened on the outer wall of the support rod near the second sliding groove. A handle is fixedly connected to the end of the support rod away from the guide cylinder.

[0011] Optionally, a sliding sleeve plate is slidably connected to the inner wall of the second clearance groove, a second abutment block is symmetrically fixedly connected to the top outer wall of the sliding sleeve plate about the central axis of the sliding sleeve plate, and a sliding column is symmetrically fixedly connected to the top outer wall of the sliding sleeve plate about the central axis of the sliding sleeve plate.

[0012] Optionally, a plurality of fixed cylinders are fixedly connected to the inner wall of the guide cylinder near the second clearance groove. The plurality of fixed cylinders are arranged in a circumferential array. The ends of the plurality of fixed cylinders away from the guide cylinder are all fixedly connected to the same fixed cylinder. A plurality of second elastic plates are fixedly connected to the bottom end of the fixed cylinder, and a first storage compartment is fixedly connected to the top end of the fixed cylinder.

[0013] Optionally, a third sliding groove is symmetrically provided on the two outer walls near the top of the first storage compartment, and a limiting block is symmetrically fixedly connected on the two outer walls near the bottom of the first storage compartment. A tension spring is fixedly connected on the outer wall of the two limiting blocks away from the fixed cylinder.

[0014] Optionally, the inner walls of the two third sliding grooves are respectively slidably connected with first sliding protrusions, and the outer walls of the two first sliding protrusions away from the third sliding grooves are fixedly connected with the same second storage compartment. The second storage compartment consists of two parts: a hollow cylinder at the top and an arc plate with a "C" shape at the bottom. A rotating protrusion is fixedly connected to the outer wall at the top of the second storage compartment, and third clearance grooves are provided on the outer walls on both sides near the bottom of the second storage compartment.

[0015] Optionally, a connecting post is fixedly connected to the outer wall of the second storage compartment near the bottom end, a sliding ring is fixedly connected to one end of the connecting post, a second sliding protrusion is symmetrically fixedly connected to the outer wall of the sliding ring, circular clearance holes are symmetrically opened on the top outer wall of the sliding ring, a pull cable is fixedly connected to the top outer wall of the sliding ring near the support rod, a pull ring is fixedly connected to the end of the pull cable away from the sliding ring, a third sliding protrusion is symmetrically fixedly connected to the inner circumference outer wall of the pull ring, and a lever is fixedly connected to the outer wall of the pull ring near the handle.

[0016] Optionally, the rotating protrusion is rotatably connected to a rotating plate, a threaded hole is provided at the center of the top outer wall of the rotating plate, limit posts are symmetrically fixedly connected to both sides of the bottom outer wall of the rotating plate, a rotating groove is provided on the bottom outer wall of the rotating plate, and several anti-slip grooves are provided on the outer wall of the rotating plate.

[0017] Optionally, a threaded post is screwed onto the inner wall of the threaded hole, a rotating handle is fixedly connected to one end of the threaded post, and a plug-in post is fixedly connected to the other end of the threaded post. Snap-in posts are symmetrically fixedly connected to the outer wall of the plug-in post, and a screwdriver bit is inserted into the outer wall of the plug-in post.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] In the above-mentioned solution, by setting up a guide component, not only can the hollow self-tapping screw be guided to prevent it from deviating from the preoperative assessment position during the screwing process, thus affecting its fixation effect on the patient's fracture site, but the hollow self-tapping screw can also be held during the guiding process. This can prevent the screw head from protruding due to tilting, which could cause skin irritation and affect postoperative recovery. In addition, the guide component facilitates the placement of the hollow self-tapping screw, and when screwing in the hollow self-tapping screw, the doctor can place the fixation plate at the patient's fracture site without the need for an assistant, thus improving the doctor's work efficiency.

[0020] By setting up clamping plates, a first elastic plate, a support rod, and a handle, the guide tube can be placed at the designated position for the patient's preoperative assessment by holding the handle, while the two clamping plates hold the fixation plate in place, eliminating the need for an assistant to pre-fix the fixation plate.

[0021] By incorporating a first storage compartment, a second storage compartment, a tension spring, and a second elastic plate within the guide assembly, doctors can quickly and easily place the hollow self-drilling screw into the second storage compartment, facilitating subsequent implantation and saving surgical time. Furthermore, the elasticity of the second elastic plate provides a certain holding force to the hollow self-drilling screw, preventing it from tilting during insertion without assistance and thus ensuring the patient's postoperative recovery.

[0022] By incorporating a rotating plate, threaded post, rotating handle, insertion post, locking post, and screwdriver bit within the guide assembly, the screwdriver bit can be easily aligned and inserted into the groove on the head of the hollow self-drilling screw by rotating the rotating plate. Then, by rotating the rotating handle, the hollow self-drilling screw is screwed into the patient's bone. This operation method is simple and convenient, effectively improving the doctor's work efficiency. At the same time, different screw sizes can be adapted by changing the screwdriver bit. Attached Figure Description

[0023] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0024] Figure 1 A three-dimensional structural diagram of a cancellous bone internal fixation device;

[0025] Figure 2 A schematic diagram of the three-dimensional structure for guiding components;

[0026] Figure 3 A cross-sectional three-dimensional structural diagram showing the fit between the guide cylinder, rotating plate, and threaded column;

[0027] Figure 4 for Figure 3 Enlarged 3D structural diagram at point A;

[0028] Figure 5 A cross-sectional enlarged three-dimensional structural diagram showing the combination of the clamping plate, the first elastic plate, and the guide cylinder;

[0029] Figure 6 A magnified first-view 3D structural diagram of the guide tube, support rod, and handle.

[0030] Figure 7 A magnified three-dimensional structural diagram from a second-view perspective showing the coordination of the guide tube, support rod, and handle.

[0031] Figure 8 A magnified three-dimensional structural diagram of the pull ring and the plate in action;

[0032] Figure 9An enlarged 3D structural diagram of the first and second storage compartments working together;

[0033] Figure 10 An enlarged three-dimensional structural diagram showing the combination of the first storage compartment, the fixed cylinder, the fixed tube, and the second elastic plate;

[0034] Figure 11 A magnified three-dimensional schematic diagram of the second storage compartment and the sliding ring in combination;

[0035] Figure 12 A magnified three-dimensional structural diagram of the sliding ring and sliding sleeve in action;

[0036] Figure 13 A magnified three-dimensional schematic diagram of the mating threaded post and screwdriver head;

[0037] Figure 14 This is an enlarged three-dimensional schematic diagram of the rotating plate.

[0038] Figure label:

[0039] 1. Fixed steel plate; 101. Positioning hole; 102. Screw hole; 2. Guide cylinder; 201. First elastic plate; 202. Clamping plate; 203. Support rod; 204. Handle; 205. Second sliding groove; 206. Positioning post; 207. Square clearance hole; 208. First clearance groove; 209. First abutment block; 2091. Inclined surface; 210. Second clearance groove; 211. Circular clearance channel; 212. First sliding groove; 3. Rotating plate; 301. Threaded hole; 302. Rotating groove; 303. Limiting post; 4. Sliding sleeve plate; 401. Second abutment block; 402. Sliding post; 5. Sliding... 501. Moving ring; 502. Connecting post; 503. Second sliding protrusion; 504. Circular clearance hole; 505. Pulling ring; 506. Plate; 507. Third sliding protrusion; 6. Fixed cylinder; 601. Fixed cylinder; 602. Second elastic plate; 7. First storage compartment; 701. Third sliding groove; 702. Limiting block; 703. Tension spring; 8. Second storage compartment; 801. First sliding protrusion; 802. Third clearance groove; 803. Rotating protrusion; 9. Threaded post; 901. Rotating handle; 902. Insertion post; 903. Snap-fit ​​post; 904. Screwdriver head; 905. Snap-fit ​​groove.

[0040] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0041] The following is a detailed description of the cancellous bone internal fixation device provided by the present invention, in conjunction with the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some well-known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0042] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0043] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0044] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0045] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0046] like Figures 1 to 14As shown, an embodiment of the present invention provides an internal fixation device for cancellous bone, including a fixation plate 1, which is a square metal plate. A plurality of screw holes 102 and a plurality of positioning holes 101 are respectively opened on the top outer wall of the fixation plate 1. The screw holes 102 and the positioning holes 101 are arranged in a linear array. The screw holes 102 are generally gourd-shaped grooves, as disclosed in the prior art, and will not be described in detail. The positioning holes 101 are trapezoidal grooves with an arc, and the top of the positioning holes 101 is chamfered. A guide assembly is used to guide the hollow self-drilling screws, and the guide assembly is connected to the fixation plate 1.

[0047] This application, by setting a guide component, can not only guide the hollow self-tapping screw to prevent it from deviating from the preoperative assessment position during the screwing process, thus affecting its fixation effect on the patient's fracture site, but also hold the hollow self-tapping screw during the guiding process. This can prevent the screw head from protruding due to tilting, which could cause skin irritation and affect postoperative recovery. In addition, the guide component facilitates the placement of the hollow self-tapping screw, and when screwing in the hollow self-tapping screw, the doctor can place the fixation plate 1 at the patient's fracture site without the need for an assistant.

[0048] As one implementation method in this embodiment, such as Figure 2 , Figure 6 As shown, the guide assembly includes a positioning post 206 inserted into the positioning hole 101. The positioning post 206 is made of metal, and its overall outline is a curved trapezoidal column. A chamfer is provided on the outer wall of the bottom end of the positioning post 206. Because the outer wall outline of the positioning post 206 matches the inner wall outline of the positioning hole 101, and with the cooperation of the chamfer on the positioning post 206 and the chamfer on the positioning hole 101, the positioning post 206 can be quickly inserted into the positioning hole 101. A guide cylinder 2 is fixedly connected to the end of the positioning post 206 away from the fixed steel plate 1. The guide cylinder 2 is a hollow metal cylinder, such as... Figure 6 As shown, square clearance holes 207 are symmetrically formed on the outer wall of the guide cylinder 2 near the bottom. The square clearance holes 207 are square grooves that extend through the inner wall of the guide cylinder 2. Figure 5As shown, the guide cylinder 2 has symmetrically formed first clearance grooves 208 on its inner wall near the top, and the first clearance grooves 208 are square grooves. The guide cylinder 2 has symmetrically formed first sliding grooves 212 on its inner wall near the middle, and the first sliding grooves 212 are convex metal grooves. Two sets of first elastic plates 201 are symmetrically fixedly connected to the outer wall of the guide cylinder 2 near the bottom. The first elastic plate 201 is a "C" shaped metal plate. When the first elastic plate 201 is subjected to force, it will deform along its bending direction. There are four first elastic plates 201 in total, divided into two groups. The two first elastic plates 201 in each group are located on both sides of the square clearance hole 207, and are distributed in a mirror image. The two first elastic plates 201 in each group are fixedly connected to the same clamping plate 202. The clamping plate 202 consists of two parts: a metal cuboid at the top and a "C" shaped metal plate at the bottom. The bottom outer wall contour of the clamping plate 202 is adapted to the outer wall contours of the two sides of the fixed steel plate 1. Therefore, the fixed steel plate 1 can be clamped by the cooperation between the two clamping plates 202. A first abutment block 209 is fixedly connected to the outer wall of the clamping plate 202 near the guide cylinder 2. The first abutment block 209 is a metal cuboid with an inclined surface 2091 at one end, wherein the inclined surface 2091 is located at the end of the first abutment block 209 away from the clamping plate 202, and the outer wall contour of the first abutment block 209 matches the inner wall contour of the square clearance hole 207. Therefore, the first abutment block 209 can slide on the inner wall of the square clearance hole 207. When the first abutment block 209 is subjected to force, it slides along the inner wall of the square clearance hole 207 away from the guide cylinder 2. When the direction of the central axis moves, it will cause the clamping plate 202 to move away from the central axis of the guide cylinder 2. At this time, the first elastic plate 201 will be subjected to force and deform along its bending direction. When the first abutting block 209 is no longer subjected to force, the first elastic plate 201 will recover its deformation under its own elasticity and cause the lower clamping plate 202 to move towards the central axis of the guide cylinder 2. The first abutting block 209 will follow the clamping plate 202 and move along the inner wall of the square clearance hole 207 towards the central axis of the guide cylinder 2.

[0049] like Figure 2 As shown, a support rod 203 is fixedly connected to the outer wall of the guide cylinder 2 near its top. The support rod 203 is a Z-shaped metal tube. Figure 6As shown, a second sliding groove 205 is symmetrically formed on the outer wall of the support rod 203 near the middle. The second sliding groove 205 is a square groove. A circular clearance channel 211 is formed on the outer wall of the support rod 203 near the second sliding groove 205. The circular clearance channel 211 is a groove with a circular overall outline, which runs through the inner wall of the guide cylinder 2 along the interior of the support rod 203. A handle 204 is fixedly connected to the end of the support rod 203 away from the guide cylinder 2. The handle 204 is a wooden cylinder with arcs at both ends. By holding the handle 204, the guide cylinder 2 can be placed in the designated position for the patient's preoperative assessment. The two clamping plates 202 can also be used to clamp the fixing steel plate 1, eliminating the need for an assistant to pre-fix the fixing steel plate 1.

[0050] In this embodiment, as Figure 5 As shown, a second clearance groove 210 is provided on the inner wall of the guide cylinder 2 near the bottom end. The second clearance groove 210 is a square annular groove. Figure 4 and Figure 12 As shown, a sliding sleeve 4 is slidably connected to the inner wall of the second clearance groove 210. The sliding sleeve 4 is a hollow metal circular plate. Two second abutment blocks 401 are fixedly connected to the top outer wall of the sliding sleeve 4. The two second abutment blocks 401 are symmetrical about the central axis of the sliding sleeve 4. The second abutment block 401 is a metal cuboid with an inclined surface at one end away from the sliding sleeve 4. The inclined surface on the second abutment block 401 is adapted to the inclined surface 2091 on the first abutment block 209 mentioned above. The inclined surfaces on the first abutment block 209 and the second abutment block 401 abut together. When the sliding sleeve 4 slides along the inner wall of the second clearance groove 210 toward the top of the sliding cylinder, the inclined surface on the second abutment block 401 abuts against the inclined surface 2091 of the first abutment block 209, causing the first abutment block 209 to move along the inner wall of the square clearance hole 207 away from the central axis of the guide cylinder 2.

[0051] like Figure 3 As shown, two sliding columns 402 are fixedly connected to the top outer wall of the sliding sleeve 4. The two sliding columns 402 are symmetrical about the central axis of the sliding sleeve 4. Each sliding column 402 consists of a metal cylinder at the bottom and a metal plate at the top. Figure 9 and Figure 10As shown, several fixed cylinders 601 are fixedly connected to the inner wall of the guide cylinder 2 near the second clearance groove 210. There are four fixed cylinders 601 in total, arranged in a circular array. The ends of the four fixed cylinders 601 furthest from the inner wall of the guide cylinder 2 are all fixedly connected to the same fixed cylinder 6. Several second elastic plates 602 are fixedly connected to the outer wall of the bottom end of the fixed cylinder 6. There are four second elastic plates 602 in total, arranged in a circular array. Each second elastic plate 602 is a metal plate with a fan-shaped top and an overall "S" shape. The end of the second elastic plate 602 away from the fixed cylinder 6 is open. When the inner wall of the four second elastic plates 602 is compressed, the second elastic plate 602 will deform along its bending direction after being subjected to force. The end of the second elastic plate 602 away from the fixed cylinder 601 moves towards the inner wall of the guide cylinder 2. The four second elastic plates 602 can provide a certain holding force for the drilling end of the hollow self-drilling screw, so that the hollow self-drilling screw is perpendicular to the screw hole 102 during the screwing process.

[0052] like Figure 9 and Figure 10 As shown, a first storage compartment 7 is fixedly connected to the top of the fixed cylinder 6. The first storage compartment 7 is a semi-circular metal plate. Symmetrically arranged third sliding grooves 701 are formed on the outer walls of the first storage compartment 7 near the top. The third sliding grooves 701 are convex straight grooves. Limiting blocks 702 are symmetrically fixedly connected to the outer walls of the first storage compartment 7 near the bottom. The limiting blocks 702 are metal cuboids. One end of a tension spring 703 is fixedly connected to the outer wall of each limiting block 702 on the side away from the fixed cylinder 6. The tension spring 703 is prior art and will not be described in detail. Figure 11As shown, when the tension spring is subjected to tension, it deforms along its bending direction. Two first sliding protrusions 801 are slidably connected to the inner walls of the two third sliding grooves 701. Each first sliding protrusion 801 is a convex metal block, and its contour matches the contour of the inner wall of the third sliding groove 701, allowing it to slide on the inner wall of the third sliding groove 701. The same second storage compartment 8 is fixedly connected to the outer wall of each of the two first sliding protrusions 801 at the end furthest from the third sliding groove 701. The second storage compartment 8 consists of a hollow cylinder at the top and a C-shaped arc plate at the bottom. The second storage compartment 8, in conjunction with the first storage compartment 7, can hold and guide hollow self-tapping screws. A rotating protrusion 803 is fixedly connected to the top outer wall of the second storage compartment 8. The rotating protrusion 803 is an inverted "convex" shaped metal block. A third clearance groove 802 is provided on the two outer walls near the bottom of the second storage compartment 8. The third clearance groove 802 is a rectangular groove. The other end of the tension spring 703 is fixedly connected to the inner wall of the third clearance groove 802 near the rotating protrusion 803. When the second storage compartment 8 slides along the inner wall of the third sliding groove towards the top of the guide cylinder 2, the tension spring 703 is subjected to tension and will deform along its bending direction. At this time, the doctor can quickly place the hollow self-drilling screw into the second storage compartment 8. The above structural design not only makes it convenient for the doctor to quickly place the hollow self-drilling screw into the second storage compartment 8, which is convenient for subsequent screw implantation and thus saves surgical time, but also provides a certain holding force to the hollow self-drilling screw through the elasticity of the second elastic plate 602 itself, so as to prevent it from shifting during the screwing process and thus affecting postoperative recovery.

[0053] In this embodiment, as Figure 12 As shown, a connecting post 501, which is a metal cuboid, is fixedly connected to the outer wall of the second storage compartment 8 near its bottom. A sliding ring 5, a metal circular ring, is fixedly connected to the end of the connecting post 501 away from the second storage compartment 8. Symmetrically fixed to the outer wall of the sliding ring 5 are second sliding protrusions 502, which are convex metal blocks. The outer contour of the second sliding protrusion 502 matches the inner contour of the first sliding groove 212 mentioned above, thus allowing the second sliding protrusion 502 to slide on the inner wall of the first sliding groove 212. Figure 11As shown, circular clearance holes 503 are symmetrically provided on the top outer wall of the sliding ring 5. The circular clearance hole 503 is a circular groove. The inner wall contour of the circular clearance hole 503 is adapted to the outer wall contour of the sliding column 402 mentioned above. Therefore, the circular clearance hole 503 can be fitted on the outer wall of the sliding column 402 and slide along the outer wall of the sliding column 402 until the sliding ring 5 slides to the end of the sliding column 402 away from the sliding sleeve plate 4. Under the obstruction of the metal circular plate at the top of the sliding column 402, the sliding ring 5 will not slide off the outer wall of the sliding column 402. As the sliding ring 5 slides, it will drive the sliding column 402 to move towards the top of the guide cylinder 2. At this time, driven by the sliding column 402, the sliding sleeve plate 4 will slide along the inner wall of the second clearance groove 210 towards the top of the guide cylinder 2. A cable 504 is fixedly connected to the outer wall of the sliding ring 5 near the support rod 203. The cable 504 is made of metal and is existing technology, so it will not be described in detail. The outer contour of the cable 504 matches the inner contour of the circular clearance channel 211, so the cable 504 can pass through the circular clearance channel 211. Figure 8 As shown, a pull ring 505 is fixedly connected to the end of the cable 504 away from the sliding ring 5. The pull ring 505 is a metal ring. A third sliding protrusion 507 is symmetrically fixedly connected to the outer wall of the inner circumference of the pull ring 505. The third sliding protrusion 507 is a metal cuboid. The outer contour of the third sliding protrusion 507 matches the inner contour of the second sliding groove 205. Therefore, the third sliding protrusion 507 can slide on the inner wall of the second sliding groove 205. A lever 506 is fixedly connected to one end of the pull ring 505 near the outer wall of the handle 204. The lever 506 is a C-shaped metal plate. When the doctor grips the handle 204 and hooks the lever 506 with his index finger, pulling the lever 506 will cause the pull ring 505 to slide along the inner wall of the second sliding groove 205 towards the handle 204. At this time, the cable 504 will be pulled by the pull ring 505, and the sliding ring 5 will be driven by the cable 504 along... The inner wall of the first sliding groove 212 slides towards the top of the guide cylinder 2. This setting allows the second storage compartment 8 to be pulled out by hooking the lever 506. The operation is simple. It can also be used in conjunction with the sliding column 402 to pull the sliding sleeve 4. The inclined surface 2091 of the second abutting block 401 abuts against the inclined surface 2091 of the first abutting block 209, causing the first abutting block 209 to be forced to move the clamping plate 202, thereby releasing the clamping of the fixed steel plate 1.

[0054] like Figure 14As shown, a rotating plate 3 is rotatably connected to the rotating protrusion 803. The rotating plate 3 is a metal circular plate. Limiting posts 303 are symmetrically fixed to both sides of the bottom outer wall of the rotating plate 3. The limiting posts 303 are metal cuboids. The outer contour of the limiting posts 303 matches the inner contour of the first clearance groove 208 mentioned above, so the limiting posts 303 can be inserted into the first clearance groove 208. A rotating groove 302 is provided on the bottom outer wall of the rotating plate 3. The rotating groove 302 is a concave annular groove. The inner contour of the rotating groove 302 matches the outer contour of the rotating protrusion 803, so the rotating protrusion 803 can rotate on the inner wall of the rotating groove 302. Several anti-slip grooves are provided on the outer wall of the rotating plate 3. The anti-slip grooves are semi-circular grooves. This design can prevent the hand from slipping when rotating the rotating plate 3. A threaded hole 301 is provided at the center of the top outer wall of the rotating plate 3. The threaded hole 301 is a circular groove with threads on its inner wall. Figure 13As shown, a threaded post 9 is screwed onto the inner wall of the threaded hole 301. The threaded post 9 is a metal cylinder with threaded grooves on its outer wall. One end of the threaded post 9 is fixedly connected to a handle 901, which is a metal plate with three semi-circular anti-slip grooves on its outer wall to prevent the doctor's hand from slipping when turning the handle 901. The other end of the threaded post 9 is fixedly connected to a plug post 902, which is a metal cylinder. Symmetrically fixed to the outer wall of the plug post 902 are snap-fit ​​posts 903, which are metal cylinders with an arc at one end. A screwdriver head 904 is inserted into the outer wall of the plug post 902. The screwdriver head 904 is a hollow metal cylinder with a quincunx-shaped metal cylinder at the bottom, and the bottom outer wall of the screwdriver head 904 is chamfered. This design facilitates the insertion of the screwdriver head 904 into the groove at the top of the hollow self-drilling screw. Two locking grooves 905 are formed on the outer wall of the screwdriver head 904. The locking grooves are L-shaped, and the inner wall contour of the locking grooves matches the outer wall contour of the locking post 903. The two locking grooves 905 are symmetrical about the center of the screwdriver head 904. When the doctor rotates the rotating plate 3, the threaded post 9 will be rotated by the rotating plate 3, and the screwdriver head 904 will also rotate accordingly, so that the screwdriver head 904 is aligned and inserted into the groove on the head of the hollow self-drilling screw until the limiting post 303 slides into the first clearance groove 208. Then, when the doctor rotates the handle 901, the threaded post 9 will rotate towards the bottom of the guide cylinder 2. As the screw rotates and moves, under the limiting action of the first clearance groove 208 on the limiting post 303, the rotating plate 3 will not rotate with the threaded post 9. At this time, the screwdriver head 904 will rotate to push the hollow self-drilling screw into the patient's bone. The above structure allows the screwdriver head 904 to be aligned and inserted into the groove on the head of the hollow self-drilling screw by rotating the rotating plate 3. Then, by rotating the handle 901, the hollow self-drilling screw is screwed into the patient's bone. This operation method is simple and convenient, effectively improving the doctor's work efficiency. At the same time, the screwdriver head 904 can be replaced to adapt to different types of screws.

[0055] The working principle of the technical solution provided by this invention is as follows:

[0056] In use, the doctor holds the handle 204, hooks the lever 506 with their index finger, and pulls the lever 506. At this time, the lever 506 drives the pull ring 505, causing it to slide along the inner wall of the second sliding groove 205 towards the handle 204. The movement of the pull ring 505 pulls the cable 504, which in turn drives the sliding ring 5 to slide along the inner wall of the first sliding groove 212 towards the top of the guide cylinder 2. When the sliding ring 5 slides to the end of the sliding post 402 away from the sliding sleeve 4, the metal disc at the top of the sliding post 402 will block the sliding ring 5, preventing it from sliding out of the outer wall of the sliding post 402. However, as the sliding ring 5 moves, the sliding post 402 will be displaced towards the top of the guide cylinder 2 by the sliding ring 5, while the sliding sleeve 4 slides along the inner wall of the second clearance groove 210 towards the top of the guide cylinder 2. The two second abutment blocks 401 will move with the sliding sleeve 4, and their inclined surfaces 2091 will abut against the inclined surfaces 2091 of the first abutment block 209. As the second abutment blocks 401 move towards the top of the guide cylinder 2, the first abutment block 209 will be subjected to force and slide along the inner wall of the square clearance hole 207 away from the central axis of the guide cylinder 2, thereby causing the clamping plate 202 to move. The first elastic plates 201 fixedly connected to both sides of the clamping plate 202 will be subjected to force and deform along their bending direction. At this time, the positioning pins 206 on the guide cylinder 2 can be inserted into the target positioning holes 101 on the fixed steel plate 1.

[0057] Meanwhile, as the sliding ring 5 slides along the inner wall of the first sliding groove 212 toward the top of the guide cylinder 2, it drives the second storage compartment 8 to slide along the inner wall of the third sliding groove 701 toward the top of the guide cylinder 2. At this time, the tension spring is under tension and deforms along its bending direction. The doctor can quickly insert the hollow self-drilling screw into the second storage compartment 8 and then release his index finger. After the tension spring is no longer under tension, it will recover its deformation under its own elasticity and pull the second storage compartment 8 back to its original position. The sliding ring 5 will also follow the second storage compartment 8 back to its original position. At this time, the sliding sleeve 4 is no longer under the tension of the sliding ring 5, and the first elastic plate 201 will recover its deformation under its own elasticity and drive the clamping plate 202 back to its original position. The two clamping plates 202 will clamp the two sides of the fixed steel plate 1. The first abutting block 209 will slide along the inner wall of the square clearance hole 207 towards the central axis of the guide cylinder 2 under the action of the clamping plates 202. The second abutting block 401 will drive the sliding sleeve 4 to slide towards the bottom of the guide cylinder 2 under the pressure of the first abutting block 209.

[0058] At this point, the doctor can hold the handle 204 and place the fixation plate 1 against the target position assessed before surgery. Then, rotating the rotating plate 3 causes the threaded post 9 to rotate, and simultaneously the screwdriver head 904 rotates, aligning and inserting it into the groove on the head of the hollow self-drilling screw until the limiting post 303 slides into the first clearance groove 208. The doctor then rotates the handle 901, causing the threaded post 9 to shift towards the bottom of the guide cylinder 2. Under the limiting effect of the first clearance groove 208 on the limiting post 303, the rotating plate 3 will not rotate with the threaded post 9. The threaded post 9 drives the screwdriver head 904 to shift towards the bottom of the guide cylinder 2, and the rotating screwdriver head 904 pushes the hollow self-drilling screw into the patient's bone. At this time, as the screw is screwed in, the inner wall of the second elastic plate 602 is subjected to compressive force and deforms along its bending direction. The end of the second elastic plate 602 away from the fixed cylinder 601 will move towards the inner wall of the guide cylinder 2 during its own deformation, and rely on its own elasticity to provide a certain holding force for the hollow self-drilling screw, so that the hollow self-drilling screw is perpendicular to the screw hole 102 during the screwing process.

[0059] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made 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 cancellous bone internal fixation device, comprising: The device includes a fixed steel plate, on the top outer wall of which are provided a plurality of screw holes and a plurality of positioning holes, which are arranged in a linear array. A guide assembly is connected to the fixed steel plate and guides the hollow self-drilling screws. The guide assembly includes a positioning post inserted into the positioning hole, a guide cylinder fixedly connected to one end of the positioning post, square clearance holes symmetrically opened on the outer wall of the guide cylinder near the bottom end, a first clearance groove symmetrically opened on the inner wall of the guide cylinder near the top end, a second clearance groove opened on the inner wall of the guide cylinder near the bottom end, and a first sliding groove symmetrically opened on the inner wall of the guide cylinder near the middle. Two sets of first elastic plates are symmetrically fixedly connected to the outer wall of the guide cylinder near the bottom end. There are four first elastic plates in total, divided into two groups. Each set of two first elastic plates is fixedly connected to a clamping plate. A first abutting block is fixedly connected to the outer wall of the clamping plate near the guide cylinder. A support rod is fixedly connected to the outer wall of the guide cylinder near the top end. A second sliding groove is symmetrically opened on the outer wall of the support rod near the middle. A circular clearance channel is opened on the outer wall of the support rod near the second sliding groove. A handle is fixedly connected to the end of the support rod away from the guide cylinder. A sliding sleeve plate is slidably connected to the inner wall of the second clearance groove. Two second abutting blocks are fixedly connected to the top outer wall of the sliding sleeve plate. The two second abutting blocks are symmetrical about the central axis of the sliding sleeve plate. Two sliding columns are fixedly connected to the top outer wall of the sliding sleeve plate. The two sliding columns are symmetrical about the central axis of the sliding sleeve plate.

2. The cancellous bone internal fixation device according to claim 1, wherein, Several fixed cylinders are fixedly connected to the inner wall of the guide cylinder near the second clearance groove. The several fixed cylinders are arranged in a circumferential array. The ends of the several fixed cylinders away from the guide cylinder are all fixedly connected to the same fixed cylinder. Several second elastic plates are fixedly connected to the bottom end of the fixed cylinder. A first storage compartment is fixedly connected to the top end of the fixed cylinder.

3. The cancellous bone internal fixation device according to claim 2, characterized in that, The first storage compartment has symmetrically provided third sliding grooves on the two outer walls near the top. The first storage compartment has symmetrically fixedly connected limit blocks on the two outer walls near the bottom. The two limit blocks have tension springs fixedly connected on the outer walls of the side away from the fixed cylinder.

4. The cancellous bone internal fixation device according to claim 3, characterized in that, The inner walls of the two third sliding grooves are respectively slidably connected with first sliding protrusions. The outer walls of the two first sliding protrusions away from the third sliding grooves are fixedly connected with the same second storage compartment. The second storage compartment consists of two parts: a hollow cylinder at the top and an arc plate with a "C" shape at the bottom. A rotating protrusion is fixedly connected to the outer wall at the top of the second storage compartment. Third clearance grooves are provided on the outer walls of the two sides near the bottom of the second storage compartment.

5. The cancellous bone internal fixation device according to claim 4, characterized in that, A connecting post is fixedly connected to the outer wall near the bottom of the second storage compartment. A sliding ring is fixedly connected to one end of the connecting post. A second sliding protrusion is symmetrically fixedly connected to the outer wall of the sliding ring. Circular clearance holes are symmetrically opened on the top outer wall of the sliding ring. A pull cable is fixedly connected to the outer wall of the top of the sliding ring near the support rod. A pull ring is fixedly connected to the end of the pull cable away from the sliding ring. A third sliding protrusion is symmetrically fixedly connected to the inner circumference outer wall of the pull ring. A lever is fixedly connected to the outer wall of the pull ring near the handle.

6. The cancellous bone internal fixation device according to claim 4, characterized in that, The rotating protrusion is rotatably connected to a rotating plate. A threaded hole is provided at the center of the top outer wall of the rotating plate. Limiting posts are symmetrically fixed to both sides of the bottom outer wall of the rotating plate. A rotating groove is provided on the bottom outer wall of the rotating plate. Several anti-slip grooves are provided on the outer wall of the rotating plate.

7. The cancellous bone internal fixation device according to claim 6, characterized in that, A threaded post is screwed onto the inner wall of the threaded hole. A rotating handle is fixedly connected to one end of the threaded post, and a plug-in post is fixedly connected to the other end of the threaded post. Snap-in posts are symmetrically fixedly connected to the outer wall of the plug-in post, and a screwdriver bit is inserted into the outer wall of the plug-in post.

Images