Internal fixing device for cancellous bone

Abstract

The invention provides a cancellous bone internal fixing device, and belongs to the technical field of medical instruments. Comprising a fixing steel plate, a plurality of screw holes and a plurality of positioning holes are formed in the outer wall of the top of the fixing steel plate, and the screw holes and the positioning holes are distributed in a linear array mode; and the guide assembly is used for guiding the hollow self-drilling screw, and the guide assembly is connected with the fixed steel plate. By arranging the guiding assembly, the hollow self-tapping screw can be guided, the situation that the fixing effect of the hollow self-tapping screw on the fracture position of a patient is affected due to the fact that the hollow self-tapping screw deviates out of the designated position of preoperative evaluation in the screwing-in process is avoided, the hollow self-tapping screw can be held in the guiding process, and the fracture position of the patient is not affected. In this way, the situation that the screw head protrudes due to inclination, skin irritation is caused, and then postoperative recovery is affected can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a cancellous bone internal fixation device. BACKGROUND

[0002] Cancellous bone internal fixation refers to a technique of fixing cancellous bone by using specific internal fixation devices (such as cancellous bone screws, steel plates, intramedullary nails, etc.) in fracture or other orthopedic surgery. This surgery is often used for fracture fixation of elderly patients, because the bone quality of elderly patients is relatively loose, and special screw fixation is required.

[0003] Nowadays, when fixing the fracture of an osteoporotic patient, a fixation steel plate is placed in the fracture area of the patient, and then a cancellous bone screw is driven in. During the use of the screw, a hole is first drilled and then the screw is screwed in. The process of drilling a hole will lose a part of the bone, and the solid screw does not have good biocompatibility with the bone, so a hollow self-tapping screw is used for fixation.

[0004] However, in the process of screwing in the screw, in order to ensure that the screw does not deviate from the specified position, a guide is used to guide the screw. At present, the commonly used guide is a metal pipe that fits the size of the screw. Because the diameters of the two ends of the screw are different, even under the guidance of the metal pipe, the screw will still be inclined, and the screw head will protrude due to the inclination, causing skin irritation.

[0005] Therefore, the present application provides a cancellous bone internal fixation device to meet the needs. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a cancellous bone internal fixation device which, by providing a guide assembly, can not only guide the hollow self-tapping screw and avoid the hollow self-tapping screw deviating from the specified position during the screwing process, thereby affecting the fixation effect on the fracture of the patient, but also can hold the hollow self-tapping screw during the guiding process, so as to avoid the screw head protruding due to the inclination, causing skin irritation and affecting postoperative recovery. In addition, the guide assembly is also convenient for placing the hollow self-tapping screw, and when the hollow self-tapping screw is screwed in, the doctor can place the fixation steel plate at the fracture of the patient without the assistance of an assistant, thereby improving the work efficiency of the doctor. Through the above settings, the problem of the screw head protruding due to the inclination and causing skin irritation can be solved.

[0007] To solve the above technical problems, the present application provides the following technical solutions:

[0008] The application discloses a cancellous bone internal fixation device which comprises a fixing steel plate, a plurality of screw holes and a plurality of positioning holes are formed in the top outer wall of the fixing steel plate respectively, the plurality of screw holes and the plurality of positioning holes are linearly arranged, and a guide assembly is connected with the fixing steel plate and guides a hollow self-drilling screw.

[0009] Optionally, the guide assembly comprises a positioning column which is inserted into the positioning hole, one end of the positioning column is fixedly connected with a guide cylinder, a square avoiding hole is symmetrically formed in the outer wall close to the bottom end of the guide cylinder, a first avoiding groove is symmetrically formed in the inner wall close to the top end of the guide cylinder, a second avoiding groove is formed in the inner wall close to the bottom end of the guide cylinder, and a first sliding groove is symmetrically formed in the inner wall close to the middle part of the guide cylinder.

[0010] Optionally, two groups of first elastic plates are symmetrically fixedly connected to the outer wall close to the bottom end of the guide cylinder, the first elastic plates are four in total and are divided into two groups, two first elastic plates in each group are fixedly connected with a clamping plate, a first abutting block is fixedly connected to the outer wall on the side close to the guide cylinder of the clamping plate, a support rod is fixedly connected to the outer wall close to the top end of the guide cylinder, a second sliding groove is symmetrically formed in the outer wall close to the middle part of the support rod, a circular avoiding channel is formed in the outer wall close to the second sliding groove of the support rod, and a handle is fixedly connected to the end of the support rod away from the guide cylinder.

[0011] Optionally, a sliding sleeve plate is slidingly connected to the inner wall of the second avoiding groove, a second abutting block is fixedly connected to the top outer wall of the sliding sleeve plate in symmetry about the central axis of the sliding sleeve plate, and a sliding column is fixedly connected to the top outer wall of the sliding sleeve plate in symmetry about the central axis of the sliding sleeve plate.

[0012] Optionally, a plurality of fixed cylinders are fixedly connected to the inner wall close to the second avoiding groove of the guide cylinder, the fixed cylinders are circularly arranged, and the ends of the fixed cylinders away from the guide cylinder are fixedly connected with a same fixed cylinder.

[0013] Optionally, a third sliding groove is symmetrically formed in the two side outer walls close to the top end of the first storage bin, a limiting block is symmetrically fixedly connected to the two side outer walls close to the bottom end of the first storage bin, and a tension spring is fixedly connected to the outer wall on the side away from the fixed cylinder of each limiting block.

[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 distal ends of the two first sliding protrusions are fixedly connected with a same second storage compartment.

[0015] Optionally, the outer wall of the bottom end of the second storage compartment is fixedly connected with a connecting column, one end of the connecting column is fixedly connected with a sliding ring, the outer wall of the sliding ring is fixedly connected with second sliding protrusions in a symmetrical manner, the top outer wall of the sliding ring is symmetrically provided with circular avoiding holes, the outer wall of the top of the sliding ring close to the support rod is fixedly connected with a cable, one end of the cable away from the sliding ring is fixedly connected with a pulling ring, the inner circumferential outer wall of the pulling ring is fixedly connected with third sliding protrusions in a symmetrical manner, and the outer wall of the pulling ring close to the handle is fixedly connected with a wrench.

[0016] Optionally, the rotating protrusion is rotatably connected with a rotating plate, a threaded hole is formed in the center of the top outer wall of the rotating plate, the bottom outer wall of the rotating plate is fixedly connected with limiting columns in a symmetrical manner, a rotating groove is formed in the bottom outer wall of the rotating plate, and a plurality of anti-skid grooves are formed in the outer wall of the rotating plate.

[0017] Optionally, a threaded column is screwed in the inner wall of the threaded hole, one end of the threaded column is fixedly connected with a rotating handle, the other end of the threaded column is fixedly connected with a plug-in column, the outer wall of the plug-in column is fixedly connected with clamping columns in a symmetrical manner, and a screw head is plugged into the outer wall of the plug-in column.

[0018] Compared with the prior art, the present application has at least the following advantages:

[0019] In the above scheme, by arranging the guide assembly, the hollow self-tapping screw can be guided, so as to avoid deviating from the specified position of the preoperative evaluation during the screwing process, thereby affecting the fixing effect on the patient's fracture, and the hollow self-tapping screw can also be held during the guiding process, so as to avoid the screw head from protruding due to inclination, causing skin irritation and affecting postoperative recovery. In addition, the guide assembly is also convenient for placing the hollow self-tapping screw, and when the hollow self-tapping screw is screwed, the doctor can place the fixing steel plate at the patient's fracture without the assistance of an assistant, thereby improving the doctor's work efficiency.

[0020] By arranging the clamping plates, the first elastic plates, the support rods and the handle, the guide cylinder can be placed at the specified position of the preoperative evaluation of the patient by holding the handle, and the fixing steel plate can be clamped by the two clamping plates without the need for an assistant to pre-fix the fixing steel plate.

[0021] By setting the first storage compartment, the second storage compartment, the tension spring and the second elastic plate in the guide assembly, not only can the doctor quickly place the cannulated self-drilling screw into the second storage compartment, which is convenient for subsequent implantation of the cannulated self-drilling screw, thereby saving the operation time, but also can give the cannulated self-drilling screw a certain holding force through the elasticity of the second elastic plate, without the assistance of others, can avoid the cannulated self-drilling screw from tilting in the process of screwing the cannulated self-drilling screw, and affect the postoperative recovery of the patient.

[0022] By setting the rotating plate, the threaded column, the rotating handle, the plug-in column, the clamping column and the screw head in the guide assembly, the screw head can be aligned and inserted into the groove on the screw head of the cannulated self-drilling screw by rotating the rotating plate, and then the cannulated self-drilling screw is screwed into the patient's bone by rotating the rotating handle. This operation method is simple and convenient, which effectively improves the work efficiency of the doctor, and at the same time, the screw head can be replaced to adapt to different types of screws. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the application and, together with the description, further serve to explain the principles of the application and to enable a person skilled in the relevant art to implement and use the application.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the cancellous bone internal fixation device;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the guide assembly;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the guide cylinder, the rotating plate and the threaded column;

[0027] Figure 4 It is Figure 3 It is a schematic diagram of the three-dimensional structure of the first enlarged view of the middle A;

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the first enlarged view of the middle A;

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the first enlarged view of the middle A;

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of the first enlarged view of the middle A;

[0031] Figure 8 It is a schematic diagram of the three-dimensional structure of the first enlarged view of the middle A;

[0032] Figure 9Schematic view of cooperation of the first storage compartment and the second storage compartment for amplifying the three-dimensional structure;

[0033] Figure 10 Schematic view of cooperation of the first storage compartment, the fixed cylinder, the fixed cylinder and the second elastic plate for amplifying the three-dimensional structure;

[0034] Figure 11 Schematic view of cooperation of the second storage compartment and the sliding ring for amplifying the three-dimensional structure;

[0035] Figure 12 Schematic view of cooperation of the sliding ring and the sliding sleeve plate for amplifying the three-dimensional structure;

[0036] Figure 13 Schematic view of cooperation of the threaded column and the screw bit for amplifying the three-dimensional structure;

[0037] Figure 14 Schematic view of the rotating plate for amplifying the three-dimensional structure.

[0038] Reference signs:

[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 column; 207, square avoiding hole; 208, first avoiding groove; 209, first abutting block; 2091, inclined surface; 210, second avoiding groove; 211, circular avoiding passage; 212, first sliding groove; 3, rotating plate; 301, threaded hole; 302, rotating groove; 303, limiting column; 4, sliding sleeve plate; 401, second abutting block; 402, sliding column; 5, sliding ring; 501, connecting column; 502, second sliding protrusion; 503, circular avoiding hole; 504, inhaul cable; 505, pulling ring; 506, spanner; 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 avoiding groove; 803, rotating protrusion; 9, threaded column; 901, handle; 902, plug-in column; 903, clamping column; 904, screw bit; 905, clamping groove.

[0040] As shown in the drawings, in order to clearly realize the structure of the embodiments of the present application, specific structures and devices are marked in the drawings, but this is only for the need of illustration, and is not intended to limit the present application in the specific structure, device and environment, and those skilled in the art can adjust or modify these devices and environment according to specific needs. DETAILED DESCRIPTION

[0041] The following will describe in detail a cancellous bone internal fixation device provided by the present application in combination with the drawings and specific embodiments. It should be noted that the following embodiments are the best, preferred embodiments, and other alternative embodiments can also be implemented by those skilled in the art for some known technologies; and the drawings are only used to more specifically describe the embodiments, and are not intended to specifically limit the present application.

[0042] It should be noted that the terms "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments", etc. in the description indicate that the described embodiments can include a specific feature, structure or characteristic, but not necessarily every embodiment includes the specific feature, structure or characteristic. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it should be within the knowledge of those skilled in the related art to implement such a feature, structure or characteristic in combination with other embodiments (whether or not explicitly described).

[0043] Generally, the terms can be understood at least in part from the context in which they are used. For example, depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular or can be used to describe combinations of features, structures, or characteristics, in the plural, without necessarily dictating whether any such feature, structure, or characteristic is required, mandatory, or essential to the techniques. Additionally, the term "based on" can be understood as not necessarily of a set of exclusive factors, but, alternatively, as allowing for existence of additional factors not explicitly described.

[0044] It can be understood that the meanings of "on", "over", and "above" in the present application should be interpreted in the broadest way, so that "on" not only means "directly on" something, but also includes the meaning of "on" something with intervening features or layers therebetween, and "over" or "above" not only means the meaning of "over" or "above" something, but also can include the meaning of "over" or "above" something without intervening features or layers therebetween.

[0045] In addition, spatially relative terms such as "under", "below", "lower", "over", "upper" and the like can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein can be interpreted accordingly.

[0046] As Figures 1 to 14As shown, the embodiment of the present application provides a cancellous bone internal fixation device, which comprises a fixed steel plate 1, the fixed steel plate 1 is a square metal plate, a plurality of screw holes 102 and a plurality of positioning holes 101 are respectively arranged on the top outer wall of the fixed steel plate 1, the plurality of screw holes 102 and the plurality of positioning holes 101 are linearly arranged, wherein the screw hole 102 is a whole gourd-shaped groove, which is disclosed as prior art, and the positioning hole 101 is a trapezoidal groove with an arc, and the top of the positioning hole 101 is provided with a chamfer; a guide assembly, the guide assembly is used for guiding the hollow self-tapping screw, and the guide assembly is connected with the fixed steel plate 1.

[0047] The hollow self-tapping screw can be guided by the guide assembly, so that the hollow self-tapping screw is prevented from deviating from the specified position of the preoperative evaluation during the screwing process, thereby affecting the fixing effect on the fracture of the patient, the hollow self-tapping screw can be held during the guiding process, so that the screw head is prevented from protruding due to the inclination of the screw head, causing the skin to be irritated, thereby affecting the postoperative recovery, in addition, the guide assembly is also convenient for placing the hollow self-tapping screw, and when the hollow self-tapping screw is screwed, the doctor can place the fixed steel plate 1 at the fracture of the patient without the assistance of an assistant.

[0048] As an embodiment in the present embodiment, as shown in Figure 2 、 Figure 6 The guide assembly comprises a positioning column 206 inserted into the positioning hole 101, the positioning column 206 is made of metal, and the overall profile of the positioning column 206 is a trapezoidal column body with an arc, and the bottom end outer wall of the positioning column 206 is provided with a chamfer, since the outer wall profile of the positioning column 206 is matched with the inner wall profile of the positioning hole 101, and the positioning column 206 can be quickly inserted into the positioning hole 101 under the cooperation of the chamfer on the positioning column 206 and the chamfer on the positioning hole 101. The end of the positioning column 206 away from the fixed steel plate 1 is fixedly connected with a guide cylinder 2, the guide cylinder 2 is a metal hollow cylinder, as shown in Figure 6 The outer wall close to the bottom end of the guide cylinder 2 is symmetrically provided with a square avoiding hole 207, the square avoiding hole 207 is a square groove, which penetrates from the inner wall of the guide cylinder 2. As shown in Figure 5As shown, the inner wall of the guide cylinder 2 close to the top end is symmetrically provided with a first avoiding slot 208, which is a square slot. The inner wall of the guide cylinder 2 close to the middle part is symmetrically provided with a first sliding slot 212, which is a “convex” metal slot. The outer wall of the guide cylinder 2 close to the bottom end is symmetrically fixedly connected with two groups of first elastic plates 201, which are “C” shaped metal plates. When the first elastic plates 201 are stressed, they will deform along the bending direction. There are four first elastic plates 201 in total, which are divided into two groups. The two first elastic plates 201 in each group are respectively located at the two sides of the square avoiding hole 207 and are mirror distributed. The two first elastic plates 201 in each group are fixedly connected with the same clamping plate 202, which has two parts, i.e., a metal cuboid top and a “C” shaped metal plate bottom. The outer wall profile of the bottom of the clamping plate 202 is adapted to the outer wall profile of the two sides of the fixed steel plate 1. Therefore, the fixed steel plate 1 can be clamped by the cooperation of the two clamping plates 202. The side of the clamping plate 202 close to the guide cylinder 2 is fixedly connected with a first abutment block 209, which is a metal cuboid provided with an inclined surface 2091 at one end. The inclined surface 2091 is provided at the end of the first abutment block 209 away from the clamping plate 202. The outer wall profile of the first abutment block 209 is adapted to the inner wall profile of the square avoiding hole 207. Therefore, the first abutment block 209 can slide on the inner wall of the square avoiding hole 207. When the first abutment block 209 is stressed and moves along the inner wall of the square avoiding hole 207 away from the center axis of the guide cylinder 2, the clamping plate 202 will move away from the center axis of the guide cylinder 2. At this time, the first elastic plate 201 will be stressed and deformed along the bending direction. When the first abutment block 209 is no longer stressed, the first elastic plate 201 will restore the deformation under the action of its own elasticity and drive the clamping plate 202 to move towards the center axis of the guide cylinder 2. The first abutment block 209 will move along the inner wall of the square avoiding hole 207 towards the center axis of the guide cylinder 2 with the clamping plate 202.

[0049] As shown in the figure, Figure 2 The outer wall of the guide cylinder 2 close to the top end is fixedly connected with a support rod 203, which is a “Z” shaped metal circular tube. Figure 6As shown, the support rod 203 is symmetrically provided with a second sliding groove 205 on the outer wall near the middle part, the second sliding groove 205 is a square groove body, and the support rod 203 is provided with a circular avoiding channel 211 on the outer wall near the second sliding groove 205, the circular avoiding channel 211 is a groove body with a circular overall profile, and penetrates from the inner wall of the guide cylinder 2 to the outside. The end of the support rod 203 away from the guide cylinder 2 is fixedly connected with a handle 204, the handle 204 is a wooden cylinder with an arc at both ends, the handle 204 can be held to place the guide cylinder 2 to the designated position of the patient preoperative assessment, and the two clamping plates 202 can be used to clamp the fixed steel plate 1, so that the assistant does not need to pre-fix the fixed steel plate 1.

[0050] In this embodiment, as shown in Figure 5 , the guide cylinder 2 is provided with a second avoiding groove 210 on the inner wall near the bottom end, and the second avoiding groove 210 is a square annular groove body. As shown in Figure 4 and Figure 12 , the inner wall of the second avoiding groove 210 is slidably connected with a sliding sleeve plate 4, the sliding sleeve plate 4 is a hollow metal circular plate, the top outer wall of the sliding sleeve plate 4 is fixedly connected with two second abutting blocks 401, the two second abutting blocks 401 are symmetrically arranged about the center axis of the sliding sleeve plate 4, and the second abutting block 401 is a metal cuboid provided with an inclined surface away from the sliding sleeve plate 4, wherein the inclined surface provided on the second abutting block 401 is matched with the inclined surface 2091 provided on the first abutting block 209 mentioned above. The inclined surfaces on the first abutting block 209 and the second abutting block 401 abut together, when the sliding sleeve plate 4 slides along the inner wall of the second avoiding groove 210 towards the top of the sliding cylinder, the inclined surface on the second abutting block 401 will abut on the inclined surface 2091 of the first abutting block 209, so that the first abutting block 209 is forced to move along the inner wall of the square avoiding hole 207 towards the direction away from the center axis of the guide cylinder 2.

[0051] As shown in Figure 3 , the top outer wall of the sliding sleeve plate 4 is fixedly connected with two sliding columns 402, the two sliding columns 402 are symmetrically arranged about the center axis of the sliding sleeve plate 4, and the sliding column 402 is composed of a metal cylinder at the bottom and a metal circular plate at the top. As shown in Figure 9 and Figure 10As shown, the guide cylinder 2 is fixedly connected with a plurality of fixed cylinders 601 on the inner wall close to the second avoiding groove 210. The fixed cylinders 601 are metal cylinders, and there are four fixed cylinders 601 in total. The four fixed cylinders 601 are distributed in a circumferential array, and the ends of the four fixed cylinders 601 away from the inner wall of the guide cylinder 2 are fixedly connected with the same fixed cylinder 6. The bottom end of the fixed cylinder 6 is fixedly connected with a plurality of second elastic plates 602. There are four second elastic plates 602 in total, which are distributed in a circumferential array. The second elastic plates 602 are metal plates with a fan-shaped shape with an arc at the top end, and the overall profile is an "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 pressed, the second elastic plate 602 will deform along the bending direction under stress. 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 in a vertical state with the screw hole 102 during the screwing process.

[0052] As shown in Figure 9 and Figure 10 , the top end of the fixed cylinder 6 is fixedly connected with a first storage compartment 7. The first storage compartment 7 is a semicircular metal plate. The two side outer walls close to the top end of the first storage compartment 7 are symmetrically provided with third sliding grooves 701. The third sliding grooves 701 are "convex" straight grooves. The two side outer walls close to the bottom end of the first storage compartment 7 are symmetrically fixedly connected with limiting blocks 702. The limiting blocks 702 are metal cuboids. The side outer walls of the two limiting blocks 702 away from the fixed cylinder 6 are respectively fixedly connected with one end of a tension spring 703. The tension spring 703 is a prior art, and thus will not be described here. 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, the top outer wall of the sliding ring 5 is symmetrically provided with a circular avoiding hole 503, which is a circular groove. The inner wall profile of the circular avoiding hole 503 is matched with the outer wall profile of the sliding column 402 mentioned above. Therefore, the circular avoiding hole 503 can be sleeved 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 block 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. With the sliding of the sliding ring 5, the sliding column 402 will be displaced towards the top of the guide cylinder 2. At this time, under the driving of the sliding column 402, the sliding sleeve plate 4 will slide along the inner wall of the second avoiding groove 210 towards the top of the guide cylinder 2. Figure 8 As shown, the end of the cable 504 away from the sliding ring 5 is fixedly connected with a pulling ring 505. The pulling ring 505 is a metal ring. The inner circumferential outer wall of the pulling ring 505 is symmetrically fixedly connected with a third sliding protrusion 507. The third sliding protrusion 507 is a metal cuboid. The outer wall profile of the third sliding protrusion 507 is matched with the inner wall profile of the second sliding groove 205. Therefore, the third sliding protrusion 507 can slide on the inner wall of the second sliding groove 205. One end of a lever plate 506 is fixedly connected to the outer wall of the pulling ring 505 close to the handle 204. The lever plate 506 is a C-shaped metal plate. When the doctor holds the handle 204 with the index finger hooked on the lever plate 506 and pulls the lever plate 506, the lever plate 506 will drive the pulling 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 pulling ring 505, and the sliding ring 5 will be driven by the cable 504 to slide along the inner wall of the first sliding groove 212 towards the top of the guide cylinder 2. Such a design can pull out the second storage compartment 8 by hooking the lever plate 506. The operation is simple. It can also cooperate with the sliding column 402 to pull the sliding sleeve plate 4. The inclined surface 2091 of the second abutting block 401 is in contact with the inclined surface 2091 of the first abutting block 209, so that the first abutting block 209 is driven to move the clamping plate 202, thereby releasing the clamping of the fixed steel plate 1.

[0054] As shown, Figure 14As shown, the rotating protrusion 803 is rotatably connected with the rotating plate 3, the rotating plate 3 is a metal circular plate, two sides of the bottom outer wall of the rotating plate 3 are symmetrically and fixedly connected with limiting columns 303, the limiting column 303 is a metal cuboid, the outer wall profile of the limiting column 303 is matched with the inner wall profile of the first avoiding slot 208 mentioned above, so the limiting column 303 can be inserted into the first avoiding slot 208. A rotating slot 302 is formed in the bottom outer wall of the rotating plate 3, the rotating slot 302 is a "concave" annular groove, the inner wall profile of the rotating slot 302 is matched with the outer wall profile of the rotating protrusion 803, so the rotating protrusion 803 can rotate on the inner wall of the rotating slot 302, a plurality of anti-skid grooves are formed in the outer wall of the rotating plate 3, the anti-skid groove is a semicircular groove, such a setting can avoid the hand slipping phenomenon when rotating the rotating plate 3. A threaded hole 301 is formed in the center position of the top outer wall of the rotating plate 3, the threaded hole 301 is a circular groove with threads in the inner wall, and Figure 13As shown, the inner wall of the threaded hole 301 is screwed with a threaded column 9, the threaded column 9 is a metal cylinder with a threaded groove on the outer wall, one end of the threaded column 9 is fixedly connected with a handle 901, the handle 901 is a metal circular plate with three semicircular anti-skid grooves on the outer wall, so that the hand can be prevented from slipping when the doctor rotates the handle 901. The other end of the threaded column 9 is fixedly connected with a plug-in column 902, the plug-in column 902 is a metal cylinder, the plug-in column 902 is fixedly connected with a clamping column 903 on the outer wall, the clamping column 903 is a metal cylinder with an arc at one end, the plug-in column 902 is inserted with a screw bit 904 on the outer wall, the screw bit 904 is a hollow metal cylinder with a plum blossom-shaped metal cylinder at the bottom, and the bottom outer wall of the screw bit 904 is provided with a chamfer, which can facilitate the insertion of the screw bit 904 into the groove in the top of the hollow self-drilling screw. The outer wall of the screw bit 904 is provided with two clamping grooves 905, the clamping grooves are "L"-shaped grooves, the inner wall profile of the clamping grooves is matched with the outer wall profile of the clamping column 903, and the two clamping grooves 905 are symmetrically arranged about the center of the screw bit 904. When the doctor rotates the rotating plate 3, the threaded column 9 will be rotated by the rotating plate 3, and the screw bit 904 will also be rotated, so that the screw bit 904 is aligned and inserted into the groove on the screw head of the hollow self-drilling screw, until the limiting column 303 slides into the first avoiding groove 208, and then, when the doctor rotates the handle 901, the threaded column 9 will rotate and move towards the bottom of the guide cylinder 2, and under the limiting action of the first avoiding groove 208 on the limiting column 303, the rotating plate 3 will not rotate with the threaded column 9. At this time, the screw bit 904 will rotate and push the hollow self-drilling screw into the patient's bone, and the above structure can be rotated by rotating the rotating plate 3, so as to align and insert the screw bit 904 into the groove on the screw head of the hollow self-drilling screw, and then rotate the handle 901 to rotate the hollow self-drilling screw into the patient's bone. This operation method is simple and convenient, which effectively improves the work efficiency of the doctor, and the screw bit 904 can be replaced to adapt to different types of screws.

[0055] The working principle of the technical scheme provided by the application is as follows:

[0056] In use, the physician holds the handle 204, hooks the index finger on the lever 506 and pulls the lever 506. At this time, the lever 506 drives the pulling ring 505 to slide along the inner wall of the second sliding groove 205 towards the handle 204. The movement of the pulling ring 505 pulls the pull rope 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 column 402 away from the sliding sleeve plate 4, the metal disc at the top of the sliding column 402 blocks the sliding ring 5 from sliding out of the outer wall of the sliding column 402, but as the sliding ring 5 moves, the sliding column 402 is driven by the sliding ring 5 to displace towards the top of the guide cylinder 2, and the sliding sleeve plate 4 slides along the inner wall of the second avoiding groove 210 towards the top of the guide cylinder 2. The two second abutting blocks 401 displace with the sliding sleeve plate 4, and the inclined surface 2091 on them comes into contact with the inclined surface 2091 on the first abutting block 209. As the second abutting block 401 moves towards the top of the guide cylinder 2, the first abutting block 209 is forced to slide along the inner wall of the square avoiding hole 207 away from the central axis of the guide cylinder 2, thereby displacing the clamping plate 202. The first elastic plate 201 fixedly connected on both sides of the clamping plate 202 is forced to deform along its bending direction. At this time, the positioning column 206 on the guide cylinder 2 can be inserted into the target positioning hole 101 on the fixed steel plate 1.

[0057] At the same time, in the process of the sliding ring 5 sliding along the inner wall of the first sliding groove 212 towards the top of the guide cylinder 2, the second storage compartment 8 is driven to slide along the inner wall of the third sliding groove 701 towards the top of the guide cylinder 2. At this time, the tension spring is deformed along its bending direction under the tension. The physician can quickly place a hollow self-drilling screw into the second storage compartment 8, and then release the index finger. After the tension spring is no longer under tension, it will restore its deformation under its own elasticity and pull the second storage compartment 8 back to its original position. The sliding ring 5 will also return to its original position with the second storage compartment 8. At this time, the sliding sleeve plate 4 is no longer under tension from the sliding ring 5, and the first elastic plate 201 will restore its deformation under its own elasticity and drive the clamping plate 202 back to its original position. The two clamping plates 202 clamp the two sides of the fixed steel plate 1, and the first abutting block 209 slides along the inner wall of the square avoiding hole 207 towards the central axis of the guide cylinder 2 under the drive of the clamping plate 202, and the second abutting block 401 drives the sliding sleeve plate 4 to slide towards the bottom of the guide cylinder 2 under the pressure of the first abutting block 209.

[0058] At this time, the doctor can hold the handle 204, and the fixed steel plate 1 is abutted at the target position evaluated in advance. Then, the rotating plate 3 is rotated, the threaded column 9 is rotated by the rotating plate 3, and the screw cutter head 904 is also rotated, so that the screw cutter head 904 is aligned and inserted into the groove on the head of the hollow self-drilling screw, until the limiting column 303 slides into the first avoiding groove 208. Then, the doctor rotates the rotating handle 901, and the threaded column 9 is displaced in the direction of the bottom of the guide cylinder 2. Under the limiting action of the first avoiding groove 208 on the limiting column 303, the rotating plate 3 cannot rotate with the threaded column 9. The threaded column 9 drives the screw cutter head 904 to be displaced in the direction of the bottom of the guide cylinder 2, and the screw cutter head 904 rotates to push the hollow self-drilling screw into the patient's bone. At this time, the second elastic plate 602 is deformed along the bending direction of its inner wall under the extrusion force when the screw is rotated. The end of the second elastic plate 602 away from the fixed cylinder 601 is moved in the direction of the inner wall of the guide cylinder 2 in the process of deformation, and provides a certain holding force for the hollow self-drilling screw by relying on the elasticity of itself, so that the hollow self-drilling screw is in a vertical state with the screw hole 102 in the process of rotation.

[0059] The present application encompasses any substitutions, modifications, equivalent methods and solutions made on the essence and scope of the present application. In order to make the public have a thorough understanding of the present application, specific details are described in the following preferred embodiments of the present application, and the present application can also be fully understood without the description of these details to those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0060] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, and these improvements and refinements should be regarded as the protection scope of the present application.

Claims

1. An internal fixation device for cancellous bone, characterized in that, The device includes a fixed steel plate, on the top outer wall of which are provided a number of screw holes and a number of positioning holes. The screw holes and positioning holes are arranged in a linear array. A guide assembly is connected to the fixed steel plate and guides the hollow self-drilling screws.

2. The cancellous bone internal fixation device according to claim 1, characterized in that, The guide assembly includes a positioning post inserted into the positioning hole. One end of the positioning post is fixedly connected to a guide cylinder. Square clearance holes are symmetrically opened on the outer wall of the guide cylinder near the bottom end. A first clearance groove is symmetrically opened on the inner wall of the guide cylinder near the top end. A second clearance groove is opened on the inner wall of the guide cylinder near the bottom end. A first sliding groove is symmetrically opened on the inner wall of the guide cylinder near the middle.

3. The cancellous bone internal fixation device according to claim 2, characterized in that, 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.

4. The cancellous bone internal fixation device according to claim 2, characterized in that, 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.

5. The cancellous bone internal fixation device according to claim 2, characterized in that, 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.

6. The cancellous bone internal fixation device according to claim 5, 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.

7. The cancellous bone internal fixation device according to claim 6, 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.

8. The cancellous bone internal fixation device according to claim 7, 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.

9. The cancellous bone internal fixation device according to claim 7, 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.

10. The cancellous bone internal fixation device according to claim 9, 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.

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