Internal fixation screw for enhancing fracture

Abstract

The invention provides an internal fixation screw for fracture enhancement, and belongs to the field of medical instruments. Comprising a screw body and a screw cap fixedly connected to the top end of the screw body, an auxiliary screw fixing assembly used for enhancing the fixing stability of the screw body is arranged at the upper end in the screw body, and a medicine carrying releasing assembly is arranged at the lower end in the screw body. By arranging the auxiliary screw fixing assembly, in the early stage of fracture healing, after the absorbable part is decomposed and absorbed and the connecting cross rod on the screw body is taken out, the control rod can be used for driving the auxiliary rod body and the top threaded section to drill into the inner wall of a fracture screw hole; the screw body is fixed in an auxiliary mode through the top threaded sections on the two sides and the auxiliary rod body, the fixing stability of the screw body is improved, the problems that in the early stage of fracture healing, after the connecting cross rod is taken out, the screw body is reduced in anti-screwing-out capacity and low in stability are solved, and it is guaranteed that the screw body cannot be screwed out after the connecting cross rod is taken out in the early stage of fracture healing. And the screw main body has a fixing effect on a fracture part.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and more particularly to a fracture enhancement internal fixation screw. Background Art

[0002] Screw internal fixation technology has a history of 100 years in treating fractures, from ordinary screws to screws with different pitches and screws, to hollow screws, hip screws, expansion screws, double-threaded screws, locking screws, micro-motion screws, and even some screws used in specific parts (such as pedicle screws, etc.), or screws made of special materials (such as absorbable screws, etc.), which can be said to be in various forms and variations. It can be used alone or as an indispensable equipment in conjunction with various other fixation systems (such as screw plate systems or intramedullary nail systems, etc.).

[0003] The existing fracture internal fixation screws have low holding force, and the stability of the screws needs to be improved, which affects the healing of broken bones. Secondly, in actual use, the fracture ends are only fixed and healed by screws, and the effect is poor. Usually, drug treatment is also required to promote fracture healing. However, the current fracture internal fixation drug-assisted treatment methods cannot continuously administer drugs during the action process, or traditional oral and injection administration are absorbed slowly and irregularly, and are easily affected by gastrointestinal and blood conditions. They may also stimulate a series of immune responses in the body, and the final effect is minimal, resulting in low healing efficiency during fracture healing treatment. In addition, since the concentration of the drug acts on each part in the same way, the affected part cannot be treated in a targeted manner, resulting in low treatment efficiency. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a fracture enhancement internal fixation screw.

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

[0006] A fracture enhancement internal fixation screw, comprising a screw body and a screw cap fixedly connected to the top of the screw body, an auxiliary screw fixing component for enhancing the fixing stability of the screw body is arranged at the upper end of the screw body, and a drug-loaded release component is arranged at the lower end of the screw body;

[0007] The auxiliary screw fixing assembly includes an annular absorbable portion embedded in the upper end of the outer circumferential surface of the screw body, and a fixed cavity opened at the upper end of the screw body; a control rod is rotatably penetrated through the middle position inside the screw body, and the first bevel gear is fixedly connected to the outer surface of the control rod located inside the fixed cavity, and the side walls of the screw body symmetrically about the fixed cavity are rotatably connected to a turntable, one end of the turntable is fixedly connected to the mounting cylinder, one end of the mounting cylinder is fixedly connected to the second bevel gear, and the two second bevel gears are meshed with the first bevel gear; a length extension assembly is provided inside the mounting cylinder, and the auxiliary rod body is movably connected through the length extension assembly, and one end of the auxiliary rod body is fixedly connected to the top threaded section.

[0008] Optionally, the length extension component includes a pressing spring arranged in the mounting cylinder and having one end fixedly connected to the second bevel gear, one end of the pressing spring is fixedly connected to the top plate, and the top plate is slidably connected to the inside of the mounting cylinder, a telescopic rod is also fixedly connected between the top plate and the second bevel gear, and the telescopic rod is located inside the pressing spring; a rotating component is provided at one end of the top plate and is rotatably connected to the auxiliary rod body through the rotating component, one end of the inside of the mounting cylinder is also fixedly connected to a transmission plate, a cross transmission groove is provided on the transmission plate, and the auxiliary rod body passes through the cross transmission groove, and a cross limit strip is also provided on the outer circumference of the auxiliary rod corresponding to the cross transmission groove.

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

[0010] Optionally, the rotating assembly includes a rotating groove opened inside the top plate, one end of the auxiliary rod body is fixedly connected to the rotating circular plate, and the auxiliary rod body is rotatably connected to the top plate via the rotating groove and the rotating circular plate.

[0011] Optionally, the length of the cross limit strip is equal to the length of the top thread segment, and when the absorbent portion blocks the top thread segment from popping out in the initial state, one end of the cross limit strip just extends into the cross transmission groove.

[0012] Optionally, the outer surface of the absorbable part is provided with a fine thread, and the fine thread and the absorbable part are both components made of polylactic acid.

[0013] Optionally, the drug-loading release assembly includes a receiving chamber opened at the lower end of the screw body, the side wall of the receiving chamber is symmetrically connected to two elastic drug-loading chambers, and a first one-way valve is provided between the two elastic drug-loading chambers and the screw body, the control rod extends to the bottom of the receiving chamber and is rotatably connected to the bottom of the receiving chamber, the outer surface of the control rod located in the receiving chamber is fixedly connected to a spur gear, one side of the two elastic drug-loading chambers is fixedly connected to a driving rack, and the two driving racks are meshed with the spur gear;

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

[0015] Optionally, the elastic drug loading chamber is surrounded by elastic film material components, and the side fixedly connected to the spur gear is a hard plastic material component.

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

[0017] Optionally, a fine thread is also provided at the upper end of the outer circumferential surface of the screw body near the lower end of the absorbable part, and a coarse thread is provided at the lower end of the outer circumferential surface of the screw body.

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

[0019] In the above scheme, by setting an auxiliary screw fixing component, in the early stage of pelvic healing, the absorbable part is digested and absorbed by the human body. After the connecting cross bar on the screw body is taken out, 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 pelvis, and then the top threaded sections on both sides and the auxiliary rod body are used to assist in fixing the screw body, thereby improving the fixation stability of the screw body and avoiding the problem of reduced anti-rotation ability and low stability of the screw body after the connecting cross bar is taken out in the early stage of pelvic healing. This ensures the fixation effect of the screw body on the fracture after the connecting cross bar is taken out in the early stage of fracture healing.

[0020] By setting a rotating component, after the top threaded section is completely drilled into the inner walls of the side surfaces on both sides of the screw hole, the pressing spring pushes the top plate to move outward to both sides, and the auxiliary rod body moves outward to both sides, so that the cross limit strip fixed on the auxiliary rod body is disengaged from the engagement with the cross transmission groove. At this time, when the control rod is rotated and continues to drive the second bevel gear to rotate through the first bevel gear, since the cross limit strip is disengaged from the engagement with the cross transmission groove at this time, and the auxiliary rod body rotates inside 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 threaded section to rotate and drill. Therefore, when the staff cannot check the drilling depth, the device can automatically stop drilling after drilling to a certain depth, thereby avoiding greater damage to the anterior pelvic ring.

[0021] By arranging a drug-loading release component inside the screw body, liquid medicine is first injected into the elastic drug-loading chamber before the screw body is nailed into the human body. After the connecting cross bar is removed in the early stage of pelvic healing, when the control rod is rotated, the spur gear fixedly connected to the control rod will be synchronously driven to rotate. When the spur gear rotates, the two driving racks will be driven to move to both sides, and the elastic drug-loading chamber will be continuously and slowly squeezed (it should be noted that the elastic drug-loading chamber is surrounded by elastic film material components, and the side fixed to the spur gear is a hard plastic material component), so that the drug liquid injected into the elastic drug-loading chamber overflows from the first one-way valve and slowly and evenly enters the human body, avoiding the problem that the efficacy of the drug is easily affected by the gastrointestinal tract and blood in traditional injection or oral administration, and can treat the affected area in a targeted manner, thereby improving the treatment efficiency.

[0022] By setting up an auxiliary release component, when the control rod rotates, the screw segment will be driven to rotate synchronously, and the ball nut ring and the screw segment are spirally transmitted. When the screw segment rotates, the ball nut ring will move downward and compress the corrugated sleeve downward. The inside of the corrugated sleeve is filled with nitrogen. 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 one side of the hard plastic material component of the elastic drug loading chamber is in contact with the side wall of the accommodating cavity, the extrusion of nitrogen can fully discharge the internal drug liquid of the elastic drug loading chamber from the second one-way valve to the fracture site. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0025] Figure 2 For the present invention Figure 1 A schematic diagram of the cross-sectional structure of;

[0026] Figure 3 For the present invention Figure 2 An enlarged structural diagram of the auxiliary screw fixing assembly;

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

[0028] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of the rotating assembly;

[0029] Figure 6 For the present invention Figure 2 Schematic diagram of the enlarged structure of the drug-loaded release component;

[0030] Figure 7 It is a schematic diagram of the top cross-sectional structure of the drug-loaded release component of the present invention;

[0031] Figure 8 For the present invention Figure 2 Schematic diagram of the enlarged structure of the auxiliary release component.

[0032] [Reference Signs]

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

[0034] 5. Auxiliary screw fixing assembly; 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 assembly; 591, rotating slot; 592, rotating circular plate;

[0036] 510, cross transmission groove; 511, cross limit strip; 512, telescopic rod; 513, auxiliary rod body; 514, top threaded section; 515, turntable; 516, installation cylinder;

[0037] 6. Drug-carrying release assembly; 61. Elastic drug-carrying chamber; 62. Driving rack; 63. First one-way valve; 64. Spur gear; 65. Accommodating chamber;

[0038] 7. Auxiliary release assembly; 71. Active chamber; 72. Ball nut ring; 73. Bellows sleeve; 74. Screw section; 75. Second one-way valve.

[0039] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0040] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0041] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0042] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

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

[0044] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0045] like Figures 1 to 8 As shown, an embodiment of the present invention provides a fracture enhanced internal fixation screw, including a screw body 1 and a screw cover 2 fixedly connected to the top of the screw body 1; the upper end of the screw body 1 is provided with an auxiliary screw fixing component 5 for enhancing the fixing stability of the screw body 1, and the lower end of the screw body 1 is provided with a drug-loaded release component 6.

[0046] The auxiliary screw fixing assembly 5 includes an annular absorbable portion 51 embedded in the upper end of the outer circumferential surface of the screw body 1, and a fixed cavity 52 opened at 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 the first bevel gear 54 is fixedly connected to the outer surface of the control rod 53 located inside the fixed cavity 52, and the side walls of the screw body 1 symmetrical on both sides with respect to the fixed cavity 52 are rotatably connected with a turntable 515, one end of the turntable 515 is fixedly connected to the mounting cylinder 516, one end of the mounting cylinder 516 is fixedly connected to the 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 the mounting cylinder 516, and the auxiliary rod body 513 is movably connected through the length extension assembly, and one end of the auxiliary rod body 513 is fixedly connected to the top threaded section 514.

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

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

[0049] When in use, the screw body 1 is first nailed into the fracture of the anterior pelvic ring by tightening the cover 2, and then the screw cover 2 is used to cooperate with the connecting cross bar to penetrate and connect different screw bodies 1 to form an internal fixator. After the early healing of the anterior pelvic ring, the connecting cross bar is taken out and the screw body 1 is retained for a long time. The anti-rotation ability of the screw body 1 itself becomes weaker, and the limiting effect of the cross bar on the screw body 1 is missing, and the stability of the screw body 1 will also be reduced. In order to solve the above problems, an auxiliary screw fixing component 5 is provided. After the early healing of the anterior pelvic ring fracture, when the connecting cross bar is taken out, the absorbable part 51 on the screw body 1 previously inserted 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 squeezing action of the pressing spring 56, and then the control rod 53 can be rotated with a wrench. When the control rod 53 rotates, it will drive the first bevel gear 54 fixed thereto. When the first bevel gear 54 rotates, the two second bevel gears 55 meshing therewith rotate accordingly. When the two second bevel gears 55 rotate, the mounting cylinder 516 and the turntable 515 fixed thereto will be driven to rotate on the inner wall of the fixed cavity 52. ​​When the mounting cylinder 516 and the turntable 515 rotate, the transmission plate 58 fixedly connected to the mounting cylinder 516 will be driven 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 pressing spring 56, the top threaded section 514 is used to drill into the inner wall bone of the screw hole. During the drilling process, the pressing spring 56 will slowly extend and push the top plate 57 to send the auxiliary rod body 513 and the top threaded section 514 outward, so that the top threaded section 514 can drill into the anterior ring of the pelvis for a distance, thereby improving the stability of the fixation.

[0050] The present invention sets an auxiliary screw fixing assembly 5. In the early stage of pelvic healing, the absorbable part 51 is digested and absorbed by the human body. After the connecting cross bar on the screw body 1 is taken out, 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 the top threaded sections 514 on both sides and the auxiliary rod body 513 are used to auxiliary fix the screw body 1, thereby improving the fixing stability of the screw body 1 and avoiding the problem that the anti-rotation ability of the screw body 1 is reduced and the stability is low after the connecting cross bar is taken out in the early stage of pelvic healing. This ensures the fixing effect of the screw body 1 on the fracture after the connecting cross bar is taken out in the early stage of fracture healing.

[0051] like Figure 5 As shown, the rotating assembly 59 includes a rotating groove 591 opened inside the top plate 57, one end of the auxiliary rod body 513 is fixedly connected to the rotating circular plate 592, and the auxiliary rod body 513 is rotatably connected to the top plate 57 via the rotating groove 591 and the rotating circular plate 592.

[0052] like Figure 4As shown, the length of the cross limiting strip 511 is equal to that of the top thread segment 514 . When the absorbent portion 51 blocks the top thread segment 514 from popping out in the initial state, one end of the cross limiting strip 511 just extends into the cross transmission groove 510 .

[0053] By adopting the above technical solution, the auxiliary screw fixing component 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 operation, the operator cannot check the drilling depth. In order to avoid drilling too deep and causing a decrease in the blood circulation effect at the fracture site, the present invention provides a rotating component 59. After the top threaded section 514 is completely drilled into the inner walls of the sides of the screw hole, the pressing spring 56 pushes the top plate 57 to move outward on both sides, and the auxiliary rod body 513 moves outward on both sides, so that the cross limit bar 511 fixedly connected to the auxiliary rod body 513 is separated from the cross transmission The second bevel gear 514 is engaged 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, the cross limit bar 511 is disengaged from the cross transmission groove 510, and the auxiliary rod body 513 rotates inside the rotating groove 591 through the rotating circular plate 592. Therefore, 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 check the drilling depth, the device can automatically stop drilling after drilling to a certain depth, thereby avoiding greater damage to the anterior pelvic ring.

[0054] like Figure 2 , Figure 6 and Figure 7 As shown, the drug-loading release component 6 includes a accommodating chamber 65 opened at the lower end of the inner part of the screw body 1, and the side walls of the accommodating chamber 65 are symmetrically fixedly connected to two elastic drug-loading chambers 61, and a first one-way valve 63 is provided between the two elastic drug-loading chambers 61 and the screw body 1, and the control rod 53 extends to the bottom of the accommodating chamber 65 and is rotatably connected to the bottom of the accommodating chamber 65, and the outer surface of the control rod 53 located in the accommodating chamber 65 is fixedly connected with a spur gear 64, and one side of the two elastic drug-loading chambers 61 is fixedly connected with a driving rack 62, and the two driving racks 62 are meshedly connected with the spur gear 64.

[0055] It also includes an auxiliary release component 7 which is arranged at a middle position inside the screw body 1 .

[0056] like Figure 6 and Figure 7 As shown, the elastic drug loading chamber 61 is surrounded by elastic film material components, and the side fixedly connected to the spur gear 64 is a hard plastic material component.

[0057] The current drug-assisted treatment methods for fracture internal fixation cannot continuously administer drugs during the course of action, or the traditional oral administration and injection administration are absorbed slowly and irregularly, and are easily affected by the gastrointestinal and blood conditions, and may also stimulate a series of immune responses in the body, and the final effect is minimal, resulting in low healing efficiency during fracture healing treatment. In addition, since the concentration of the drug acts on each part in the same way, the affected part cannot be treated in a targeted manner, resulting in low treatment efficiency. The present invention arranges a drug-loaded release component 6 inside the screw body 1, and before the screw body 1 is nailed into the human body, liquid drugs are first injected into the elastic drug-loaded chamber 61, and the connecting cross bar is removed in the early stage of pelvic healing. After that, when 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 to both sides and continuously and slowly squeeze the elastic drug loading chamber 61 (it should be noted that the elastic drug loading chamber 61 is surrounded by elastic film material components, and the side fixedly connected to the spur gear 64 is a hard plastic material component), so that the drug liquid 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 efficacy of the drug is easily affected by the gastrointestinal tract and blood in traditional injection or oral administration, and can treat the affected area in a targeted manner, thereby improving the treatment efficiency.

[0058] like Figure 2 and Figure 8 As shown, the auxiliary release assembly 7 includes an active cavity 71 opened in the middle position inside the screw body 1, the control rod 53 movably extends into the active cavity 71, and the outer surface of the control rod 53 located inside the active cavity 71 is provided with a screw segment 74, and a corrugated sleeve 73 is fixedly connected to the bottom of the active cavity 71, and the upper end of the corrugated sleeve 73 is fixedly connected to a ball nut ring 72, and the ball nut ring 72 is spirally driven with the screw segment 74, and a second one-way valve 75 is provided between the screw segment 74 and the elastic drug loading chamber 61.

[0059] When the drug-carrying release assembly 6 works, the two driving racks 62 are used to move to both sides and continuously and slowly squeeze the elastic drug-carrying chamber 61. Since the accommodating chamber 65 is a cylindrical structure, the elastic drug-carrying chamber 61 is surrounded by elastic film material components, and the side fixed to the spur gear 64 is a hard plastic material component. After the driving rack 62 is pushed to a certain extent, due to the obstruction of the cylindrical structure, one side of the hard plastic material component of the elastic drug-carrying chamber 61 cannot be completely fitted with the side wall of the accommodating chamber 65, resulting in insufficient extrusion of the drug liquid. The present invention provides an auxiliary release assembly 7, when the control rod 53 rotates When the screw segment 74 moves, it will synchronously drive the screw segment 74 to rotate, and the ball nut ring 72 and the screw segment 74 are spirally transmitted. When the screw segment 74 rotates, the ball nut ring 72 will move downward and compress the corrugated sleeve 73 downward. The inside of the corrugated sleeve 73 is filled with nitrogen. When the corrugated sleeve 73 is compressed, the internal nitrogen is injected into the elastic drug loading chamber 61 through the second one-way valve 75, so that one side of the hard plastic material component of the elastic drug loading chamber 61 is in contact with the side wall of the accommodating cavity 65. With the extrusion of nitrogen, the internal drug liquid of the elastic drug loading chamber 61 can be fully discharged from the second one-way valve 75 to the fracture site.

[0060] like Figure 1 and Figure 2 As shown, the outer surface of the absorbable part 51 is provided with a fine thread 4, and the fine thread 4 and the absorbable part 51 are both components made of polylactic acid, 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 circumferential surface of the screw body 1 is also provided with a fine thread 4 near the lower end of the absorbable portion 51 , and the lower end of the outer circumferential surface of the screw body 1 is provided with a coarse thread 3 .

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

[0063] First, the screw body 1 is nailed into the fracture of the anterior pelvic ring by tightening the cover 2, and then the screw cover 2 is used to cooperate with the connecting cross bar to penetrate and connect different screw bodies 1 to form an internal fixator. After the early healing of the anterior pelvic ring, the connecting cross bar is taken out and the screw body 1 is retained for a long time. The anti-rotation ability of the screw body 1 itself becomes weaker, and the limiting effect of the cross bar on the screw body 1 is missing, and the stability of the screw body 1 will also be reduced. In order to solve the above problems, an auxiliary screw fixing component 5 is provided. After the early healing of the anterior pelvic ring fracture, when the connecting cross bar is taken out, the absorbable part 51 on the screw body 1 previously inserted 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 squeezing action of the pressing spring 56, and then the control rod 53 can be rotated with a wrench. When the control rod 53 rotates, it will drive the first bevel gear 54 fixed thereto to rotate. When the first bevel gear 54 rotates, the two second bevel gears 55 meshing therewith rotate accordingly. When the two second bevel gears 55 rotate, the mounting cylinder 516 and the turntable 515 fixed thereto will be driven to rotate on the inner wall of the fixed cavity 52. ​​When the mounting cylinder 516 and the turntable 515 rotate, the transmission plate 58 fixedly connected to the mounting cylinder 516 will be driven 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 pressing spring 56, the top threaded section 514 is used to drill into the inner wall bone of the screw hole. During the drilling process, the pressing spring 56 will slowly extend and push the top plate 57 to send the auxiliary rod body 513 and the top threaded section 514 outward, so that the top threaded section 514 can drill into the anterior ring of the pelvis for a distance, thereby improving the stability of the fixation.

[0064] By setting the rotating assembly 59, after the top threaded section 514 is completely drilled into the inner walls of the side surfaces of the screw hole, the pressing spring 56 pushes the top plate 57 to move outward on both sides, and the auxiliary rod body 513 moves outward on both sides, so that the cross limit strip 511 fixedly connected to the auxiliary rod body 513 is disengaged from the clamping connection 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 is disengaged from the clamping connection with the cross 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 check the drilling depth, the device can automatically stop drilling after drilling to a certain depth, thereby avoiding greater damage to the anterior pelvic ring.

[0065] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fracture enhancement internal fixation screw, comprising a screw body and a screw cap fixedly connected to the top of the screw body, characterized in that: An auxiliary screw fixing component for enhancing the fixing stability of the screw body is arranged at the upper end of the screw body, and a drug-loaded release component is arranged at the lower end of the screw body; The auxiliary screw fixing assembly includes an annular absorbable portion embedded in the upper end of the outer circumferential surface of the screw body, and a fixed cavity opened at the upper end of the screw body; a control rod is rotatably penetrated through the middle position inside the screw body, and the first bevel gear is fixedly connected to the outer surface of the control rod located inside the fixed cavity, and the side walls of the screw body symmetrically about the fixed cavity are rotatably connected to a turntable, one end of the turntable is fixedly connected to the mounting cylinder, one end of the mounting cylinder is fixedly connected to the second bevel gear, and the two second bevel gears are meshed with the first bevel gear; a length extension assembly is provided inside the mounting cylinder, and the auxiliary rod body is movably connected through the length extension assembly, and one end of the auxiliary rod body is fixedly connected to the top threaded section.

2. The fracture enhancement internal fixation screw according to claim 1, characterized in that: The length extension component includes a pressing spring arranged in the mounting cylinder and one end of which is fixedly connected to the second bevel gear. One end of the pressing spring is fixedly connected to the top plate, and the top plate is slidably connected to the inside of the mounting cylinder. A telescopic rod is also fixedly connected between the top plate and the second bevel gear, and the telescopic rod is located inside the pressing spring; a rotating component is provided at one end of the top plate and is rotatably connected to the auxiliary rod body through the rotating component. One end of the inside of the mounting cylinder is also fixedly connected to a transmission plate, a cross transmission groove is provided on the transmission plate, and the auxiliary rod body passes through the cross transmission groove, and a cross limit strip is also provided on the outer circumference of the auxiliary rod corresponding to the cross transmission groove.

3. The fracture enhancement internal fixation screw according to claim 2, characterized in that: During the entire operation of the auxiliary screw fixing assembly, the pressing spring is in a compressed state.

4. The fracture enhancement internal fixation screw according to claim 2, characterized in that: The rotating assembly comprises a rotating groove opened inside the top plate, one end of the auxiliary rod body is fixedly connected to the rotating circular plate, and the auxiliary rod body is rotatably connected to the top plate via the rotating groove and the rotating circular plate.

5. The fracture enhancement internal fixation screw according to claim 2, characterized in that: The length of the cross limit strip is equal to the length of the top thread segment. When the absorbent portion blocks the top thread segment from popping out in the initial state, one end of the cross limit strip just extends into the cross transmission groove.

6. The fracture enhancement 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 components made of polylactic acid.

7. The fracture enhancement internal fixation screw according to claim 1, characterized in that: The drug-loading release assembly includes a receiving chamber opened at the lower end of the screw body, the side wall of the receiving chamber is symmetrically connected to two elastic drug-loading chambers, and a first one-way valve is provided between the two elastic drug-loading chambers and the screw body, the control rod extends to the bottom of the receiving chamber and is rotatably connected to the bottom of the receiving chamber, the outer surface of the control rod located in the receiving chamber is fixedly connected to a spur gear, one side of the two elastic drug-loading chambers is fixedly connected to a driving rack, and the two driving racks are meshed with the spur gear; It also includes an auxiliary release component which is arranged at the middle position inside the screw body.

8. The fracture enhancement internal fixation screw according to claim 7, characterized in that: The elastic drug loading chamber is surrounded by elastic film material components, and the side fixedly connected to the spur gear is a hard plastic material component.

9. The fracture enhancement internal fixation screw according to claim 7, characterized in that: The auxiliary release component includes an active cavity opened in the middle position inside the screw body, the control rod movably extends into the active cavity, and the outer surface of the control rod located inside the active cavity is provided with a screw section, a corrugated sleeve is fixedly connected to the bottom of the active cavity, the upper end of the corrugated sleeve is fixedly connected to a ball nut ring, and the ball nut ring is spirally transmitted with the screw section, and a second one-way valve is provided between the screw section and the elastic drug loading chamber.

10. The fracture enhancement internal fixation screw according to claim 1, characterized in that: The upper end of the outer circumferential surface of the screw body is also provided with a fine thread close to the lower end of the absorbable part, and the lower end of the outer circumferential surface of the screw body is provided with a coarse thread.

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