A fracture-enhancing internal fixation screw

Abstract

The present invention provides a fracture-enhancing internal fixation screw, belonging to the field of medical devices. It includes a screw body and a screwing cap fixedly connected to the top end of the screw body. An auxiliary screw fixation assembly for enhancing the fixation stability of the screw body is arranged at the upper end inside the screw body, and a drug-carrying and releasing assembly is arranged at the lower end inside the screw body. By setting the auxiliary screw fixation assembly, in the initial stage of fracture healing, after the absorbable part is decomposed and absorbed, and after removing the connecting cross bar on the screw body, the control rod can be used to drive the auxiliary rod body and the top threaded section to drill into the inner wall of the screw hole of the fracture, and then the top threaded sections on both sides and the auxiliary rod body are used to assist in fixing the screw body, improving the fixation stability of the screw body, avoiding the problem that the anti-rotation ability of the screw body is reduced and the stability is low after removing the connecting cross bar in the early stage of fracture healing, and ensuring the fixation effect of the screw body on the fracture site after removing the connecting cross bar in the early stage of fracture healing.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly to a fracture-enhancing internal fixation screw. Background Art

[0002] The screw internal fixation technique for treating fractures has a history of a hundred years. From ordinary screws to screws with different pitches and screw rods, to hollow screws, hip screws, expansion screws, double-threaded screws, locking screws, micro-motion screws, and even screws for specific parts (such as pedicle screws, etc.), or screws made of special materials (such as absorbable screws, etc.), they can be described as in various forms and with different variations. It can be used alone or as an essential component in combination with various other fixation systems (such as the plate-screw system or the intramedullary nail system, etc.).

[0003] The existing fracture internal fixation screws have low holding power, and the stability of the screws needs to be improved, which affects the healing of broken bones. Secondly, in the actual use process, simply fixing and healing the fracture ends with screws has a poor effect. Usually, drug treatment is also required to promote fracture healing. However, the current fracture internal fixation drug-assisted treatment means cannot continuously administer drugs during the action process, or the traditional oral and injection drug administrations have slow and irregular absorption, are easily affected by the gastrointestinal and blood states, and may also trigger a series of immune reactions in the body, and finally the achieved effect is minimal, resulting in low healing efficiency during the fracture healing treatment process. And because the drug concentration acts on each part equally, it cannot specifically treat the affected area, leading to low treatment efficiency. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a fracture-enhancing internal fixation screw.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A fracture-enhancing internal fixation screw, comprising a screw main body and a screwing cap fixedly connected to the top end of the screw main body. An auxiliary screw fixation assembly for enhancing the fixing stability of the screw main body is arranged at the upper end inside the screw main body, and a drug-loading and releasing assembly is arranged at the lower end inside the screw main body.

[0007] The auxiliary screw fixing assembly includes an annular absorbable part embedded in the upper end of the outer cylindrical surface of the screw body, and a fixing cavity opened in the upper end of the screw body; a control rod rotatably penetrates through the middle position inside the screw body, and a first bevel gear is fixedly connected to the outer surface of the part of the control rod located inside the fixing cavity. Both side walls of the screw body symmetric about the fixing cavity are rotatably connected with turntables. One end of each turntable is fixedly connected with an installation cylinder body. One end of each installation cylinder body is fixedly connected with a second bevel gear, and the two second bevel gears are both meshed and connected with the first bevel gear; a length extension assembly is arranged inside each installation cylinder body, and an auxiliary rod body is movably connected through the length extension assembly. One end of each auxiliary rod body is fixedly connected with a top threaded section.

[0008] Optionally, the length extension assembly includes a pressing spring arranged inside the installation cylinder body and fixedly connected with the second bevel gear at one end. One end of the pressing spring is fixedly connected with a top plate, and the top plate is slidably connected inside the installation cylinder body. An expansion rod is also fixedly connected between the top plate and the second bevel gear, and the expansion rod is located inside the pressing spring; a rotation assembly is arranged at one end of the top plate and the auxiliary rod body is rotatably connected through the rotation assembly. One end inside the installation cylinder body is also fixedly connected with a transmission plate. A cross transmission groove is opened on the transmission plate, and the auxiliary rod body penetrates through the cross transmission groove. A cross limit strip is also arranged on the outer cylindrical surface of the auxiliary rod body corresponding to the cross transmission groove.

[0009] Optionally, during the operation of the entire auxiliary screw fixing assembly, the pressing spring is in a compressed state.

[0010] Optionally, the rotation assembly includes a rotation groove opened inside the top plate. One end of the auxiliary rod body is fixedly connected with a rotation circular plate, and the auxiliary rod body is rotatably connected with the top plate by using the rotation groove and the rotation circular plate.

[0011] Optionally, the length of the cross limit strip is equal to the length of the top threaded section. When the absorbable part blocks the ejection of the top threaded section in the initial state, one end of the cross limit strip just extends into the cross transmission groove.

[0012] Optionally, a fine thread is arranged on the outer surface of the absorbable part, and both the fine thread and the absorbable part are made of polylactic acid material.

[0013] Optionally, the drug-loading and releasing assembly includes a receiving cavity opened at the lower end inside the screw body. Two elastic drug-loading bins are symmetrically and fixedly connected to the side wall of the receiving cavity, and a first one-way valve is arranged between each of the two elastic drug-loading bins and the screw body. The control rod extends to the bottom of the receiving cavity and is rotatably connected with the bottom of the receiving cavity. A straight gear is fixedly connected to the outer surface of the part of the control rod located in the receiving cavity. A driving rack is fixedly connected to one side of each of the two elastic drug-loading bins, and the two driving racks are both meshed and connected with the straight gear;

[0014] It also includes an auxiliary release component disposed at the middle position inside the screw body.

[0015] Optionally, the periphery of the elastic drug-loading chamber is a component made of elastic film material, and the side connected to the spur gear is a component made of rigid plastic material.

[0016] Optionally, the auxiliary release component includes a movable cavity opened at the middle position inside the screw body. The control rod movably penetrates and extends into the movable cavity, and a lead screw section is provided on the outer surface of the part of the control rod located inside the movable cavity. A corrugated sleeve is fixedly connected to the bottom of the movable cavity. The upper end of the corrugated sleeve is fixedly connected with a ball nut ring, and the ball nut ring is in screw drive with the lead screw section. A second one-way valve is provided between the lead screw section and the elastic drug-loading chamber.

[0017] Optionally, fine threads are also provided on the upper end of the outer cylindrical surface of the screw body near the lower end of the absorbable part, and coarse threads are provided on the lower end of the outer cylindrical surface of the screw body.

[0018] The technical solution provided by the present invention has at least the following beneficial effects compared with the prior art:

[0019] In the above solution, by setting the auxiliary screw fixing component, in the early stage of pelvic healing, the absorbable part is digested and absorbed by the human body. After removing the connecting cross bar on the screw body, the control rod can be used to drive the auxiliary rod body and the top thread section to drill into the inner wall of the screw hole of the pelvis, and then the top thread sections on both sides and the auxiliary rod body are used to assist in fixing the screw body, improving the fixing stability of the screw body, avoiding the problem that the anti-rotation ability of the screw body is reduced and the stability is low after removing the connecting cross bar in the early stage of pelvic healing, and ensuring the fixing effect of the screw body on the fracture site after removing the connecting cross bar in the early stage of fracture healing.

[0020] By setting the rotating component, after the top thread section completely drills into the inner walls of both sides of the screw hole, at this time, pressing the spring pushes the top plate to move outward to both sides, and the auxiliary rod body also moves outward to both sides, so that the cross-shaped limiting strip fixedly connected to the auxiliary rod body disengages from the engagement with the cross-shaped transmission groove. At this time, when the control rod rotates and continues to drive the second bevel gear to rotate through the first bevel gear, since the cross-shaped limiting strip disengages from the engagement with the cross-shaped transmission groove at this time, and the auxiliary rod body rotates in the rotating groove through the rotating circular plate, when the second bevel gear continues to rotate, it cannot continue to drive the auxiliary rod body and the top thread section to rotate and drill, so that when the staff cannot check the drilling depth, the device can automatically stop drilling after drilling a certain depth, avoiding causing greater damage to the anterior ring of the pelvis.

[0021] By setting up a drug-loading and releasing component inside the screw body, before driving the screw body into the human body, inject liquid medicine into the elastic drug-loading chamber first. After removing the connecting crossbar in the early stage of pelvic healing, when rotating the control rod, the spur gear fixedly connected to the control rod will rotate synchronously. When the spur gear rotates, it will drive two driving racks to move towards both sides and continuously and slowly squeeze the elastic drug-loading chamber. (It should be noted that the four sides of the elastic drug-loading chamber are made of elastic film material components, and the side connected to the spur gear is made of rigid plastic material components), so that the liquid medicine injected into the elastic drug-loading chamber overflows from the first one-way valve and slowly and evenly enters the human body, avoiding the problems that the efficacy of traditional injection or oral administration is easily affected by the gastrointestinal tract and blood, and can treat the affected area specifically, improving the treatment efficiency.

[0022] By setting up an auxiliary releasing component, when the control rod rotates, the lead screw section will rotate synchronously. The ball nut ring is in screw drive with the lead screw section. When the lead screw section rotates, the ball nut ring will move downward and compress the corrugated sleeve downward. Nitrogen is filled inside the corrugated sleeve. When the corrugated sleeve is compressed, the internal nitrogen is injected into the elastic drug-loading chamber through the second one-way valve, so that when the side of the elastic drug-loading chamber made of rigid plastic material just contacts the side wall of the accommodating cavity, with the extrusion of nitrogen, the liquid medicine inside the elastic drug-loading chamber can be fully discharged from the second one-way valve to the fracture affected area. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0024] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 For the present invention Figure 1 is a cross-sectional structural schematic diagram;

[0026] Figure 3 For the present invention Figure 2 is an enlarged structural schematic diagram of the auxiliary screw fixing component in the present invention;

[0027] Figure 4 is a partial three-dimensional structural schematic diagram of the auxiliary screw fixing component of the present invention;

[0028] Figure 5 For the present invention Figure 4 is an enlarged structural schematic diagram of the rotating component in the present invention;

[0029] Figure 6 For the present invention Figure 2 is an enlarged structural schematic diagram of the drug-loading and releasing component in the present invention;

[0030] Figure 7 It is a schematic top sectional view of the drug-loading and releasing component of the present invention;

[0031] Figure 8 For the present invention Figure 2 is an enlarged schematic view of the auxiliary releasing component in the present invention.

[0032] [Reference numerals]

[0033] 1. Screw main body; 2. Screw cap; 3. Coarse thread; 4. Fine thread;

[0034] 5. Auxiliary screw fixing component; 51. Absorbable part; 52. Fixed cavity; 53. Control rod; 54. First bevel gear; 55. Second bevel gear; 56. Pressing spring; 57. Top plate; 58. Transmission plate;

[0035] 59. Rotating component; 591. Rotating groove; 592. Rotating circular plate;

[0036] 510. Cross transmission groove; 511. Cross limiting strip; 512. Telescopic rod; 513. Auxiliary rod body; 514. Top thread section; 515. Turntable; 516. Installation cylinder;

[0037] 6. Drug-loading and releasing component; 61. Elastic drug-loading bin; 62. Driving rack; 63. First one-way valve; 64. Straight gear; 65. Accommodating cavity;

[0038] 7. Auxiliary releasing component; 71. Moving cavity; 72. Ball nut ring; 73. Corrugated sleeve; 74. Lead screw section; 75. Second one-way valve.

[0039] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present invention to this specific structure, device and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments. Detailed implementation manners

[0040] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0041] It should be noted that in the specification, the mention of "an embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. indicates that the described embodiments may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. Additionally, when combining embodiments to describe a specific feature, structure or characteristic, implementing such feature, structure or characteristic in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0042] Generally, terms can be understood at least in part from their use in context. For example, at least in part depending 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 can be used to describe a combination of features, structures or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather can alternatively, at least in part depending on the context, allow for the existence of other factors that may not be explicitly described.

[0043] It can be understood that the meanings of "on", "above", and "over" in the present invention should be interpreted in the broadest manner, such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0044] Furthermore, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. are used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the drawings. Spatial relative terms are intended to cover different orientations in the use or operation of the device other than the orientation depicted in the drawings. The device can be oriented in other ways, and the spatial relative descriptive terms used herein can be correspondingly interpreted similarly.

[0045] As Figures 1 to 8 shown, an embodiment of the present invention provides a fracture-enhancing internal fixation screw, including a screw body 1 and a screwing cap 2 fixedly connected to the top end of the screw body 1; an auxiliary screw fixing assembly 5 for enhancing the fixing stability of the screw body 1 is provided at the upper end inside the screw body 1, and a drug-loading and releasing assembly 6 is provided at the lower end inside the screw body 1.

[0046] The auxiliary screw fixing assembly 5 includes an annular absorbable part 51 embedded in the upper end of the outer cylindrical surface of the screw body 1, and a fixing cavity 52 opened in the upper end of the screw body 1; a control rod 53 is rotatably penetrated through the middle position inside the screw body 1, and a first bevel gear 54 is fixedly connected to the outer surface of the part of the control rod 53 located inside the fixing cavity 52. On both side walls of the screw body 1 symmetric about the fixing cavity 52, turntables 515 are rotatably connected. One end of each turntable 515 is fixedly connected with a mounting cylinder 516. One end of each mounting cylinder 516 is fixedly connected with a second bevel gear 55, and the two second bevel gears 55 are meshed with the first bevel gear 54; a length extension assembly is arranged inside each mounting cylinder 516, and an auxiliary rod body 513 is movably connected through the length extension assembly. One end of each auxiliary rod body 513 is fixedly connected with a top thread section 514.

[0047] As Figures 2 to 4 shown, the length extension assembly includes a pressing spring 56 arranged inside the mounting cylinder 516 and fixedly connected with the second bevel gear 55 at one end. One end of the pressing spring 56 is fixedly connected with a top plate 57, and the top plate 57 is slidably connected inside the mounting cylinder 516. An expansion rod 512 is also fixedly connected between the top plate 57 and the second bevel gear 55, and the expansion rod 512 is located inside the pressing spring 56; a rotating assembly 59 is arranged at one end of the top plate 57 and the auxiliary rod body 513 is rotatably connected through the rotating assembly 59. One end inside the mounting cylinder 516 is also fixedly connected with a transmission plate 58. A cross transmission groove 510 is opened on the transmission plate 58, and the auxiliary rod body 513 penetrates through the cross transmission groove 510. A cross limit strip 511 is also arranged on the outer cylindrical surface of the auxiliary rod body 513 corresponding to the cross transmission groove 510.

[0048] During the whole working process of the auxiliary screw fixing assembly 5, the pressing spring 56 is in a compressed state.

[0049] During use, first drive the screw body 1 into the anterior pelvic ring fracture site by turning the screw cap 2. Then, use the screw cap 2 to cooperate with the connecting cross bar to penetrate and connect different screw bodies 1 to form an internal fixation frame. After the early healing of the anterior pelvic ring, remove the connecting cross bar and leave the screw body 1 in place for a long time. The anti-rotation ability of the screw body 1 itself becomes weaker, and without the limiting effect of the cross bar on the screw body 1, the stability of the screw body 1 will also decrease. To solve the above problems, by setting the auxiliary screw fixing component 5, when the connecting cross bar is removed after the early healing of the anterior pelvic ring fracture, the absorbable part 51 on the screw body 1 that was previously implanted into the body is absorbed by the human body and disappears. At this time, the auxiliary rod body 513 and the top threaded section 514 are pressed against the inner wall of the screw hole on the anterior pelvic ring under the extrusion of the pressing spring 56. Then, a wrench can be used to rotate the control rod 53. When the control rod 53 rotates, it will drive the first bevel gear 54 fixedly connected to it to rotate. When the first bevel gear 54 rotates, the two second bevel gears 55 meshing with it will rotate accordingly. When the two second bevel gears 55 rotate, they will drive the mounting cylinder 516 and the turntable 515 fixedly connected to them to rotate on the inner wall of the fixed cavity 52. When the mounting cylinder 516 and the turntable 515 rotate, they will drive the transmission plate 58 fixedly connected to the mounting cylinder 516 to rotate. At this time, the cross-shaped limiting strip 511 on the auxiliary rod body 513 is engaged inside the cross-shaped transmission groove 510, so it will drive the auxiliary rod body 513 to rotate, and with the continuous extrusion force of the pressing spring 56, drill into the inner wall of the bone of the screw hole using the top threaded section 514. During the drilling process, the pressing spring 56 will slowly elongate and push the top plate 57 to send the auxiliary rod body 513 and the top threaded section 514 outwards, so that the top threaded section 514 can drill into the anterior pelvic ring for a certain distance, improving the fixing stability.

[0050] In the present invention, by setting the auxiliary screw fixing component 5, in the early stage of pelvic healing, the absorbable part 51 is digested and absorbed by the human body. After removing the connecting cross bar on the screw body 1, the control rod 53 can be used to drive the auxiliary rod body 513 and the top threaded section 514 to drill into the inner wall of the screw hole of the pelvis, and then use the top threaded sections 514 on both sides and the auxiliary rod body 513 to assist in fixing the screw body 1, improving the fixing stability of the screw body 1, avoiding the problems of reduced anti-rotation ability and low stability of the screw body 1 after removing the connecting cross bar in the early stage of pelvic healing, and ensuring the fixing effect of the screw body 1 on the fracture site after removing the connecting cross bar in the early stage of fracture healing.

[0051] As Figure 5 shown, the rotation assembly 59 includes a rotation groove 591 formed inside the top plate 57. One end of the auxiliary rod body 513 is fixedly connected to a rotation circular plate 592. The auxiliary rod body 513 is rotationally connected to the top plate 57 by means of the rotation groove 591 and the rotation circular plate 592.

[0052] As Figure 4As shown, the length of the cross-shaped limiting strip 511 is equal to the length of the top threaded section 514. When the absorbable part 51 blocks the ejection of the top threaded section 514 in the initial state, one end of the cross-shaped limiting strip 511 just extends into the cross-shaped transmission groove 510.

[0053] By adopting the above technical solution, the auxiliary screw fixing assembly 5 can be used to drill the top threaded section 514 and the auxiliary rod body 513 into the inner wall of the screw hole of the pelvis. However, during the operation, the operator cannot view the drilling depth. To avoid drilling too deep and causing a decrease in the blood circulation effect at the fracture site, the present invention sets a rotating assembly 59. After the top threaded section 514 completely drills into the inner walls of both sides of the screw hole, at this time, pressing the spring 56 pushes the top plate 57 to move outward on both sides, and the auxiliary rod body 513 also moves outward on both sides, causing the cross-shaped limiting strip 511 fixedly connected to the auxiliary rod body 513 to disengage from the engagement with the cross-shaped transmission groove 510. At this time, when the control rod 53 rotates and continues to drive the second bevel gear 55 to rotate through the first bevel gear 54, since the cross-shaped limiting strip 511 disengages from the engagement with the cross-shaped transmission groove 510 at this time, and the auxiliary rod body 513 rotates inside the rotating groove 591 through the rotating circular plate 592, when the second bevel gear 55 continues to rotate, it cannot continue to drive the auxiliary rod body 513 and the top threaded section 514 to rotate and drill. Therefore, when the staff cannot view the drilling depth, the device can automatically stop drilling after drilling a certain depth, avoiding causing greater damage to the anterior ring of the pelvis.

[0054] As Figure 2 、 Figure 6 and Figure 7 As shown, the drug-loading and releasing assembly 6 includes a receiving cavity 65 opened at the lower end inside the screw body 1. Two elastic drug-loading chambers 61 are symmetrically and fixedly connected to the side wall of the receiving cavity 65, and a first one-way valve 63 is provided between each of the two elastic drug-loading chambers 61 and the screw body 1. The control rod 53 extends to the bottom of the receiving cavity 65 and is rotatably connected to the bottom of the receiving cavity 65. A spur gear 64 is fixedly connected to the outer surface of the part of the control rod 53 located in the receiving cavity 65. A driving rack 62 is fixedly connected to one side of each of the two elastic drug-loading chambers 61, and both driving racks 62 are meshed with the spur gear 64.

[0055] It further includes an auxiliary releasing assembly 7 arranged at the middle position inside the screw body 1.

[0056] As Figure 6 and Figure 7 As shown, the periphery of the elastic drug-loading chamber 61 is a component made of elastic film material, and the side connected to the spur gear 64 is a component made of rigid plastic material.

[0057] The current drug-assisted treatment methods for internal fixation of fractures cannot continuously administer drugs during the action process. Or, the absorption of traditional oral and injection drugs is slow, irregular, and easily affected by the gastrointestinal and blood states. It may also trigger a series of immune reactions in the body, and ultimately the achieved effect is minimal, resulting in low healing efficiency during the fracture healing treatment process. And because the drug concentration acts on each part equally and cannot specifically treat the affected area, the treatment efficiency is low. In the present invention, a drug-loading and releasing component 6 is arranged inside the screw body 1. Before driving the screw body 1 into the human body, a liquid drug is first injected into the elastic drug-loading chamber 61. When the connecting cross bar is removed in the early stage of pelvic healing and the control rod 53 is rotated, the spur gear 64 fixedly connected to the control rod 53 will be driven to rotate. When the spur gear 64 rotates, it will drive the two driving racks 62 to move towards both sides and continuously and slowly squeeze the elastic drug-loading chamber 61. (It should be noted that the periphery of the elastic drug-loading chamber 61 is a component made of elastic film material, and the side connected to the spur gear 64 is a component made of rigid plastic material), so that the liquid medicine injected into the elastic drug-loading chamber 61 overflows from the first one-way valve 63 and slowly and evenly enters the human body, avoiding the problem that the drug effect is easily affected by the gastrointestinal and blood in the traditional injection or oral method, and can specifically treat the affected area, improving the treatment efficiency.

[0058] As Figure 2 and Figure 8 shown, the auxiliary release component 7 includes a movable cavity 71 opened at the middle position inside the screw body 1. The control rod 53 movably penetrates and extends into the movable cavity 71, and a lead screw section 74 is provided on the outer surface of the part of the control rod 53 located inside the movable cavity 71. A corrugated sleeve 73 is fixedly connected to the bottom of the movable cavity 71. A ball nut ring 72 is fixedly connected to the upper end of the corrugated sleeve 73, and the ball nut ring 72 is in screw drive with the lead screw section 74. A second one-way valve 75 is provided between the lead screw section 74 and the elastic drug-loading chamber 61.

[0059] When the drug-loading release component 6 works, and the two driving racks 62 move towards both sides and continuously and slowly squeeze the elastic drug-loading chamber 61, since the accommodating cavity 65 is of a cylindrical structure, the periphery of the elastic drug-loading chamber 61 is made of an elastic film material component, and the side connected to the spur gear 64 is made of a rigid plastic material component. After the driving rack 62 is pushed to a certain extent, due to the obstruction of the cylindrical structure, the side of the elastic drug-loading chamber 61 made of the rigid plastic material component cannot be completely attached to the side wall of the accommodating cavity 65, resulting in insufficient extrusion of the liquid medicine. In the present invention, by providing an auxiliary release component 7, when the control rod 53 rotates, the lead screw section 74 will be driven to rotate synchronously. The ball nut ring 72 is in screw drive with the lead screw section 74. When the lead screw section 74 rotates, the ball nut ring 72 will move downward and compress the corrugated sleeve 73 downward. The corrugated sleeve 73 is filled with nitrogen. When the corrugated sleeve 73 is compressed, the nitrogen inside is injected into the elastic drug-loading chamber 61 through the second one-way valve 75, so that when the side of the elastic drug-loading chamber 61 made of the rigid plastic material component just contacts the side wall of the accommodating cavity 65, with the extrusion of nitrogen, the liquid medicine inside the elastic drug-loading chamber 61 can be fully discharged from the second one-way valve 75 to the fracture affected area.

[0060] As Figure 1 and Figure 2 shown, the outer surface of the absorbable part 51 is provided with fine-pitch threads 4. The fine-pitch threads 4 and the absorbable part 51 are both made of polylactic acid material components, which can be better absorbed by the human body, and the final products are water and carbon dioxide, which are harmless to the human body.

[0061] The upper end of the outer cylindrical surface of the screw body 1 near the lower end of the absorbable part 51 is also provided with fine-pitch threads 4, and the lower end of the outer cylindrical surface of the screw body 1 is provided with coarse-pitch threads 3.

[0062] The working process of the technical solution of the present invention is as follows:

[0063] First, the screw body 1 is nailed into the anterior pelvic ring fracture site by turning the screw cap 2. Then, the screw cap 2 is used in cooperation with the connecting cross bar to penetrate and connect different screw bodies 1 to form an internal fixation frame. After the early healing of the anterior pelvic ring, the connecting cross bar is removed, and the screw body 1 is left in the body for a long time. The anti-rotation ability of the screw body 1 itself becomes weak, and without the limiting effect of the cross bar on the screw body 1, the stability of the screw body 1 will also decrease. To solve the above problems, by setting the auxiliary screw fixing component 5, when the connecting cross bar is removed after the early healing of the anterior pelvic ring fracture, the absorbable part 51 on the screw body 1 previously implanted into the body is absorbed by the human body and disappears. At this time, the auxiliary rod body 513 and the top thread section 514 are pressed against the inner wall of the screw hole on the anterior pelvic ring under the extrusion of the compression spring 56. Then, the control rod 53 can be rotated by using a wrench. When the control rod 53 rotates, the first bevel gear 54 fixedly connected to it will rotate. When the first bevel gear 54 rotates, the two second bevel gears 55 meshing with it will rotate accordingly. When the two second bevel gears 55 rotate, they will drive the installation cylinder body 516 and the turntable 515 fixedly connected to them to rotate on the inner wall of the fixed cavity 52. When the installation cylinder body 516 and the turntable 515 rotate, they will drive the transmission plate 58 fixedly connected to the installation cylinder body 516 to rotate. At this time, the cross limit strip 511 on the auxiliary rod body 513 is engaged in the cross transmission groove 510, so the auxiliary rod body 513 will be driven to rotate, and with the continuous extrusion force of the compression spring 56, the top thread section 514 will drill into the inner wall of the bone of the screw hole. During the drilling process, the compression spring 56 will slowly elongate and push the top plate 57 to send the auxiliary rod body 513 and the top thread section 514 outwards, so that the top thread section 514 can drill into the anterior pelvic ring for a certain distance, improving the fixation stability.

[0064] By setting the rotation component 59, after the top thread section 514 completely drills into the inner walls of both sides of the screw hole, at this time, the compression spring 56 pushes the top plate 57 to move outwards to both sides, and the auxiliary rod body 513 also moves outwards to both sides, causing the cross limit strip 511 fixedly connected to the auxiliary rod body 513 to disengage from the engagement with the cross transmission groove 510. At this time, when the control rod 53 rotates and continues to drive the second bevel gear 55 to rotate through the first bevel gear 54, since the cross limit strip 511 has disengaged from the engagement with the cross transmission groove 510 at this time, and the auxiliary rod body 513 rotates in the rotation groove 591 through the rotation circular plate 592, when the second bevel gear 55 continues to rotate, it cannot continue to drive the auxiliary rod body 513 and the top thread section 514 to rotate and drill. Thus, when the staff cannot view the drilling depth, the device can automatically stop drilling after drilling a certain depth, avoiding causing greater damage to the anterior pelvic ring.

[0065] The present invention covers any alternatives, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention even without the description of these details. In addition, well-known methods, processes, procedures, components, and circuits are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0066] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A fracture-enhancing internal fixation screw, comprising a screw body and a screwing cap fixedly connected to the top end of the screw body, characterized in that: An auxiliary screw fixing component for enhancing the fixing stability of the screw body is provided at the upper end inside the screw body, and a drug-loading and releasing component is provided at the lower end inside the screw body; The auxiliary screw fixing component includes an annular absorbable part embedded in the upper end of the outer cylindrical surface of the screw body, and a fixing cavity opened at the upper end inside the screw body; a control rod is rotatably penetrated through the middle position inside the screw body, and a first bevel gear is fixedly connected to the outer surface of the part of the control rod located inside the fixing cavity. The side walls of the screw body symmetrically about the fixing cavity are both rotatably connected with turntables. One end of each turntable is fixedly connected with an installation cylinder body. One end of each installation cylinder body is fixedly connected with a second bevel gear, and both second bevel gears are meshed and connected with the first bevel gear; a length extension component is arranged inside each installation cylinder body, and an auxiliary rod body is movably connected through the length extension component. One end of each auxiliary rod body is fixedly connected with a top thread section; The drug-loading and releasing component includes a receiving cavity opened at the lower end inside the screw body. Two elastic drug-loading bins are symmetrically fixedly connected to the side wall of the receiving cavity, and a first one-way valve is provided between both elastic drug-loading bins and the screw body. The control rod extends to the bottom of the receiving cavity and is rotatably connected to the bottom of the receiving cavity. A spur gear is fixedly connected to the outer surface of the part of the control rod located in the receiving cavity. A driving rack is fixedly connected to one side of each of the two elastic drug-loading bins, and both driving racks are meshed and connected with the spur gear; It further includes an auxiliary releasing component arranged at the middle position inside the screw body; The periphery of the elastic drug-loading bin is a component made of elastic film material, and the side connected to the spur gear is a component made of hard plastic material; The auxiliary releasing component includes a movable cavity opened at the middle position inside the screw body. The control rod movably penetrates and extends into the movable cavity, and a lead screw section is provided on the outer surface of the part of the control rod located in the movable cavity. A corrugated sleeve is fixedly connected to the bottom of the movable cavity. A ball nut ring is fixedly connected to the upper end of the corrugated sleeve, and the ball nut ring is in screw drive with the lead screw section. A second one-way valve is provided between the lead screw section and the elastic drug-loading bin.

2. The fracture-enhancing internal fixation screw according to claim 1, wherein: The length extension component includes a pressing spring arranged inside the installation cylinder body and having one end fixedly connected to the second bevel gear. One end of the pressing spring is fixedly connected to a top plate, and the top plate is slidably connected inside the installation cylinder body. An expansion rod is further fixedly connected between the top plate and the second bevel gear, and the expansion rod is located inside the pressing spring; a rotating component is provided at one end of the top plate and the auxiliary rod body is rotatably connected through the rotating component. A transmission plate is further fixedly connected to one end inside the installation cylinder body. A cross transmission groove is opened on the transmission plate, and the auxiliary rod body penetrates through the cross transmission groove. A cross limiting strip is further provided on the outer cylindrical surface of the auxiliary rod body corresponding to the cross transmission groove.

3. The fracture-enhancing internal fixation screw according to claim 2, wherein: During the operation of the entire auxiliary screw fixing component, the pressing spring is in a compressed state.

4. The fracture-enhancing internal fixation screw according to claim 2, characterized in that: The rotating component includes a rotating groove opened inside the top plate. One end of the auxiliary rod body is fixedly connected with a rotating circular plate, and the auxiliary rod body is rotatably connected to the top plate by means of the rotating groove and the rotating circular plate.

5. The fracture-enhancing internal fixation screw according to claim 2, characterized in that: The length of the cross-shaped limiting strip is equal to the length of the top threaded section. When the absorbable part blocks the ejection of the top threaded section in the initial state, one end of the cross-shaped limiting strip just extends into the cross-shaped transmission groove.

6. The fracture-enhancing internal fixation screw according to claim 1, characterized in that: The outer surface of the absorbable part is provided with fine-pitch threads, and both the fine-pitch threads and the absorbable part are made of polylactic acid.

7. The fracture-enhancing internal fixation screw according to claim 1, characterized in that: Fine-pitch threads are also provided on the upper end of the outer cylindrical surface of the screw body near the lower end of the absorbable part, and coarse-pitch threads are provided on the lower end of the outer cylindrical surface of the screw body.

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