A fixation device for long bone fractures

Abstract

This invention discloses a fixation device for long bone fractures, belonging to the field of medical devices. It includes a limiting part, a base, elastic sutures, a reduction mesh sleeve, and a support adjustment rod. The limiting part is fixedly connected to the wall of the long bone shaft. The first end of the base is fixedly connected to the limiting part, and the second end of the base has an internally threaded hole extending towards the first end. The elastic suture extends from the second end of the base. Multiple elastic suture threading holes are discretely distributed on the reduction mesh sleeve. One side of the support adjustment rod is threadedly connected to the internally threaded hole, and the other side is fixedly connected to the reduction mesh sleeve. Multiple elastic sutures extending from the second end of the base pass through the fracture fragments at the bone ends and then fix the fracture fragments to the side of the reduction mesh sleeve facing the base via the aforementioned threading holes. This invention enables stable reduction of long bone fracture fragments, and only requires micro-holes for threading at the fracture ends, avoiding the trauma caused by numerous bone screw holes.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, and specifically relates to a fixation device for long bone fractures. Background Technology

[0002] Long bones are bones with a uniform medullary cavity in which the bone marrow is located. (See attached image) Figure 1 As shown, long bones consist of two ends 1 and a shaft 2. In adults, the connection between the ends and the shaft is called the epiphyseal line. Common long bones include, but are not limited to, the humerus, radius, ulna, femur, and tibia.

[0003] Currently, most fixation procedures for long bone fractures involving the bone ends rely on intramedullary nails and customized external bone plates. To fix the intramedullary nail into the diaphysis of the long bone to be reduced, two or more staggered holes are typically created in the non-fractured area distal to the intramedullary nail and / or the fractured area proximal to accommodate the bone screws. After drilling holes in the bone in the non-fractured area, the bone screws are inserted into the holes created in the intramedullary nail, thereby fixing the intramedullary nail into the diaphysis of the long bone. In addition, in the fractured area involving the bone ends, multiple bone fragments to be reduced and fixed also need to be fixed to the holes created in the intramedullary nail using bone screws.

[0004] It is evident that the above-mentioned fixation procedures for long bone fractures involving the bone ends are highly complex and time-consuming. Furthermore, they can lead to the formation of multiple pore wounds on the bone fragments in the distal non-fractured areas and / or the proximal fractured areas, resulting in a prolonged overall recovery period for the patient.

[0005] For example, Globus Medical Inc.'s patent US11931083B2 discloses a proximal humeral stabilization system, wherein, as attached... Figure 2-3 As shown, the intramedullary nail 250 includes an upper part 252 and a lower part 254. Both the upper part 252 and the lower part 254 are provided with multiple through holes 256. Fasteners 230 can pass through the corresponding openings 220 in the bone plate 210 and through the corresponding through holes 256 in the upper part 252 and the lower part 254 of the intramedullary nail 250 to complete the positioning. Although patent US11931083B2 achieves the positioning of the intramedullary nail 250 in the intramedullary cavity and the fixation of the fracture fragments, it uses a large number of fasteners 230.

[0006] Therefore, there is an urgent need to develop a fixation device for long bone fractures to solve the technical problems of the current fixation procedures for long bone fractures involving the bone ends, which are highly complex and time-consuming, and also result in multiple holes and wounds on the bone fragments in the distal non-fracture area and / or proximal fracture area, leading to a prolonged overall recovery period for patients. Summary of the Invention

[0007] The purpose of this invention is to provide a fixation device for long bone fractures, in order to solve at least one of the technical problems of the current fixation procedures for long bone fractures involving the bone ends, which are characterized by high complexity and long operation time, and also result in the formation of multiple bone screw holes in the non-fractured areas and the fracture fragments at the fracture ends of the long bone, thus prolonging the overall recovery period for patients.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A fixation device for long bone fractures, the fixation device comprising:

[0010] A limiting part, wherein the limiting part is fixedly connected to the wall of the bone shaft cavity of the long bone;

[0011] The base has a first end and a second end disposed opposite to each other. The first end is fixedly connected to a limiting part, and the second end has an internal threaded hole extending toward the first end.

[0012] Elastic sutures, wherein one end of multiple elastic sutures is fixed to the base and the other end extends from the second end of the base;

[0013] A reset mesh sleeve, wherein multiple elastic suture thread holes are discretely distributed on the reset mesh sleeve;

[0014] A support adjustment rod is provided, one side of which is threadedly connected to an internal threaded hole, and the other side is fixedly connected to a reset mesh sleeve; wherein...

[0015] The fracture site of the long bone involves the bone end. Multiple elastic sutures extending from the second end of the base pass through the bone end fracture fragments and then fix the bone end fracture fragments to the side of the reduction mesh facing the base through several suture holes. The tension of the multiple elastic sutures is adjusted and locked so that the bone end fracture fragments are pressed into the position to be reduced by the reduction mesh.

[0016] Furthermore, the limiting part includes:

[0017] The shell has a semi-closed cylindrical cavity, and the shell has several through slots along its circumference;

[0018] The mounting component is located in a cylindrical cavity and is fixedly connected to the shell;

[0019] A rotating shaft, which passes through the mounting component and is rotatably connected to the mounting component;

[0020] The abutting blade has one end fixed to the circumferential surface of the rotating shaft, and the other end movably disposed in or protruding from the through-slot.

[0021] Furthermore, the cylindrical cavity has internal threads on the side of its wall facing the base, and is closed on the side away from the base.

[0022] The first end of the base is provided with a first external thread, which matches the internal thread. The base and the limiting part are connected by a threaded seal through the first external thread and the internal thread.

[0023] Furthermore, the support adjustment rod includes a first rod segment, a second rod segment, and a third rod segment arranged in sequence. The first rod segment is used to drive the limiting part to be fixedly connected to the bone shaft cavity wall of the long bone. The second rod segment is provided with a second external thread that mates with the internal threaded hole. The length of the third rod segment extending from the second end can be adjusted by the screwing action of the second external thread and the internal threaded hole.

[0024] Furthermore, the outer diameter of the third rod segment is smaller than the minor diameter of the internal threaded hole, and the length of the third rod segment is greater than the length of the internal threaded hole. The distance between the first rod segment and the limiting part can be adjusted by translating the third rod segment along the opening direction of the internal threaded hole.

[0025] Furthermore, both the internal threaded hole and the rotating shaft are located on the axis of the cylindrical cavity, and the end face of the rotating shaft facing the base has a groove, into which the outer periphery of the first rod segment can be embedded; wherein,

[0026] When the outer periphery of the first rod segment is embedded in the groove, the first rod segment can be twisted from the outside of the second end to cause the rotating shaft to rotate, thereby causing the abutting blade to extend out from the through strip and be fixedly connected to the bone shaft cavity wall of the long bone.

[0027] Furthermore, the repositioning mesh sleeve is a flexible sheet that can be implanted into the human body. The flexible sheet has a solid portion and a mesh portion surrounding and connected to the outer periphery of the solid portion. The solid portion is fixedly connected to the support adjustment rod.

[0028] The threading holes are located in the area between adjacent mesh holes on the reset mesh sleeve.

[0029] Furthermore, the solid portion is enclosed by a metal sheet core, the material of which is selected from titanium, titanium alloy, stainless steel or cobalt-chromium alloy.

[0030] Furthermore, the length of the third rod segment extending from the second end is adjusted by the screwing action of the second external thread and the internal thread hole to correspond to the position to be reset when the bone fragment is pressed by the repositioning mesh.

[0031] Furthermore, the limiting part also includes an anti-reverse rotation component, which is a ratchet and pawl structure. The ratchet is disposed on the surface of the rotating shaft, and the pawl is disposed on the wall surface of the cylindrical cavity.

[0032] The present invention has the following beneficial effects:

[0033] This invention provides a fixation device for long bone fractures, comprising a limiting part, a base, an elastic suture, a reduction mesh, and a support adjustment rod; the base has a first end and a second end disposed opposite to each other, the first end being fixedly connected to the limiting part, and the second end having an internally threaded hole extending toward the first end; the support adjustment rod comprises a first rod segment, a second rod segment, and a third rod segment arranged sequentially, the first rod segment being used to drive the limiting part to be fixedly connected to the bone shaft wall of the long bone, the second rod segment having a second external thread that mates with the internally threaded hole, and the third rod segment being adjustable in length extending from the second end by the screwing action of the second external thread and the internally threaded hole;

[0034] The third rod segment, through the screwing action of the second external thread and the internal thread hole, adjusts the length extending from the second end to correspond to the position to be reduced where the fracture fragment is pressed by the reduction mesh sleeve. Then, the reduction mesh sleeve is fixedly connected to the support adjustment rod. Finally, multiple elastic sutures extending from the second end of the base pass through the fracture fragment and then through several suture holes to fix the fracture fragment to the side of the reduction mesh sleeve facing the base. The tension of the multiple elastic sutures is adjusted and locked to press the fracture fragment into the position to be reduced by the reduction mesh sleeve. The fixation device for long bone fractures of the present invention is simple and efficient to operate, provides good fixation of the fracture fragment, and avoids the trauma caused by numerous bone screw holes. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the long bone structure involved in the background technology of this invention;

[0036] Figure 2 This is a schematic diagram illustrating the technical solutions related to the background technology of this invention;

[0037] Figure 3 This is a schematic diagram illustrating the technical solutions related to the background technology of this invention;

[0038] Figure 4 This is a three-dimensional structural diagram of a fixation device for long bone fractures according to an embodiment of the present invention;

[0039] Figure 5 Schematic diagram of fractures at the bone ends, bone ends, and bone shafts of long bones;

[0040] Figure 6This is a three-dimensional schematic diagram of the limiting part of a fixation device for long bone fractures according to an embodiment of the present invention;

[0041] Figure 7 This is a three-dimensional schematic diagram of the rotating shaft and the contact blade of the limiting part of the fixation device for long bone fractures according to an embodiment of the present invention;

[0042] Figure 8 This is a left view of the rotation axis and the contact blade of the limiting part of the fixation device for long bone fractures according to an embodiment of the present invention;

[0043] Figure 9 This is a three-dimensional schematic diagram of the base of a fixation device for long bone fractures according to an embodiment of the present invention;

[0044] Figure 10 These are the front and left views of the support adjustment rod of the fixation device for long bone fractures according to an embodiment of the present invention;

[0045] Figure 11 for Figure 6 A sectional view along the AA direction;

[0046] Figure 12 for Figure 9 BB direction sectional view;

[0047] Figure 13 This is a schematic diagram of the elastic suture stitches of a fixation device for long bone fractures according to an embodiment of the present invention. Detailed Implementation

[0048] The various aspects of the present invention will be further described in detail below.

[0049] Unless otherwise defined or stated, all technical and scientific terms used herein have the same meaning as are familiar to a user skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention.

[0050] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For users skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0051] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The drawings only show components relevant to this application and are not drawn according to the actual number, shape, and size of the components in the actual implementation. In the actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex. For example, the thickness of the elements in the drawings may be exaggerated for clarity. Example

[0052] See appendix Figure 1-12 The present invention provides a fixation device for long bone fractures, the fixation device comprising:

[0053] A limiting part, wherein the limiting part is fixedly connected to the wall of the bone shaft cavity of the long bone;

[0054] The base 4 has a first end and a second end that are disposed opposite to each other. The first end is fixedly connected to the limiting part, and the second end has an internal threaded hole 41 extending toward the first end.

[0055] Elastic sutures 5, one end of multiple elastic sutures 5 is fixed to the base 4, and the other end extends from the second end of the base 4;

[0056] A reset mesh sleeve 6, on which multiple elastic stitching thread 5 thread holes 61 are discretely distributed;

[0057] A support adjustment rod 7 is provided, one side of which is threadedly connected to an internal threaded hole 41, and the other side is fixedly connected to a reset mesh sleeve 6; wherein...

[0058] The fracture site of the long bone involves the bone end. Multiple elastic sutures 5 extending from the second end of the base 4 pass through the bone end fracture fragments and then fix the bone end fracture fragments to the side of the reduction mesh sleeve 6 facing the base 4 through several suture holes 61. The tension of the multiple elastic sutures 5 is adjusted and locked so that the bone end fracture fragments are pressed into the position to be reduced by the reduction mesh sleeve 6.

[0059] It should be noted that the fixation device for long bone fractures described herein is suitable for long bone fractures involving bone ends. There are many methods for classifying bone end injuries, the most commonly used being the Salter-Harris classification. This classification, based on the mechanism of bone end injury, divides bone end injuries on X-rays into five types, with appendices... Figure 5 The five types of fractures shown from left to right are: end fracture, end fracture, and shaft fracture. The fixation device for long bone fractures of the present invention is particularly suitable for the fixation of end fractures.

[0060] In a preferred embodiment, the elastic suture 5 is a non-absorbable elastic suture, such as polyester braided suture or ultra-high strength nylon suture. Polyester braided suture or ultra-high strength nylon suture possesses excellent tensile strength and toughness, with a breaking strength 3-5 times that of ordinary absorbable sutures. It can maintain stable fixation of the fracture ends for a long time, and has a high elastic recovery rate, allowing it to adapt to minor bone movements during early functional exercises and preventing suture breakage. It is suitable for use in long bone fracture scenarios. One end of the elastic suture 5 is intercepted by a hole 42 at the second end of the base 4, and the other end extends out of the hole 42. Specifically, one end of the elastic suture 5 can be intercepted by the hole 42 by knotting or other means.

[0061] In a preferred embodiment, the repositioning mesh sleeve 6 is a flexible sheet material that can be implanted into the human body. The material of the repositioning mesh sleeve 6 is selected from one or more combinations of polyethylene terephthalate, polypropylene, polyethylene, polylactic acid, polyglycolic acid, polycaprolactone, chitosan, silk fibroin, polytetrafluoroethylene, polyetheretherketone, natural fibers, high-density polyethylene, and ultra-high molecular weight polyethylene. Therefore, the repositioning mesh sleeve 6 not only possesses excellent biocompatibility but also ideal mechanical strength.

[0062] In a preferred embodiment, the limiting part, the base 4, and the support adjustment rod 7 are all made of biocompatible materials. Furthermore, the support adjustment rod 7 is made of a biocompatible metallic material, such as titanium or a titanium alloy.

[0063] As a preferred embodiment, see Appendix Figure 6 , 11 The limiting part includes:

[0064] The housing 31 has a semi-closed cylindrical cavity and a number of through slots along its circumference.

[0065] Mounting component 32, which is located in a cylindrical cavity and is fixedly connected to the housing 31;

[0066] A rotating shaft 33 is inserted into the mounting component and rotatably connected to the mounting component.

[0067] The abutting blade 34 has one end fixed to the circumferential surface of the rotating shaft 33, and the other end movably disposed in or protruding from the through slot.

[0068] In a preferred embodiment, the mounting component 32 is a bearing, which is disposed on the wall of a cylindrical cavity, and the rotating shaft 33 is disposed inside the bearing, thereby realizing the rotational connection between the rotating shaft 33 and the bearing. Preferably, there are multiple mounting components 32, thereby ensuring the working stability of the rotating shaft 33.

[0069] In a preferred embodiment, the limiting part further includes an anti-reverse rotation component 37, which is a ratchet and pawl structure. The ratchet is disposed on the surface of the rotating shaft 33, and the pawl is disposed on the cylindrical cavity wall.

[0070] As a preferred embodiment, see Appendix Figure 7-8 The contact blade 34 is in the shape of a curved cuboid. A plurality of curved cuboid contact blades 34 are spaced apart along the circumferential surface of the rotation axis 33, forming a blade group. Specifically, each blade group has at least three curved cuboid contact blades 34. The cross-section of each curved cuboid contact blade 34 along the circumferential direction of the rotation axis 33 is approximately a curved rectangle. The two long sides of the curved rectangle are both arcs. The tangent along the rotation axis 33 at the contact position between any long side of the curved rectangle and the tangent along the arc forms a first included angle β, which is an acute angle.

[0071] It should be noted that after the limiting part is delivered to the predetermined position within the cavity of the long bone shaft, the rotating shaft 33 is driven to rotate, causing the other end of the contact blade 34 to extend from the through-slit and abut against the wall of the bone shaft cavity. Thus, the present invention can achieve non-invasive fixation of the limiting part without causing additional damage to the long bone.

[0072] In a preferred embodiment, the other end of each pair of adjacent contacting blades 34 in each blade assembly, away from the rotation axis 33, is connected to an elastic band 35. The elastic band 35 can be made of silicone or TPU material. When the contacting blades 34 contact the wall of the bony cavity, the elastic band is under tension, and at this time, the length of the elastic band 35 is less than its maximum tensile length. The use of the elastic band 35 can significantly improve the overall stability of the blade assembly structure and enhance the contact and fixation effect with the bony cavity wall.

[0073] In a preferred embodiment, the number of blade groups is no less than two. This significantly enhances the static friction between the limiting portion and the bone cavity wall, improving the effectiveness of the limiting portion as an anchoring component in fixing long bone fractures.

[0074] As a preferred embodiment, as shown in the appendix Figure 6 , 9 As shown, the cylindrical cavity has an internal thread 36 on the side of its wall facing the base 4, and is closed on the side away from the base 4.

[0075] The first end of the base 4 is provided with a first external thread 43, which matches the internal thread 36. The base 4 and the limiting part are connected by a threaded seal through the first external thread 43 and the internal thread 36.

[0076] As a preferred embodiment, as shown in the appendix Figure 10 As shown, the support adjustment rod 7 includes a first rod segment 71, a second rod segment 72, and a third rod segment 73 arranged in sequence. The first rod segment 71 is used to drive the limiting part to be fixedly connected to the bone shaft cavity wall of the long bone. The second rod segment 72 is provided with a second external thread 74 that mates with the internal threaded hole 41. The third rod segment 73 can be adjusted to extend from the second end by the screwing action of the second external thread 74 and the internal threaded hole 41.

[0077] In a preferred embodiment, both the internal threaded hole 41 and the rotating shaft 33 are disposed on the axis of the cylindrical cavity. The end face of the rotating shaft 33 facing the base 4 has a groove 35, into which the outer periphery of the first rod segment 71 can be embedded; wherein,

[0078] Adjust the first rod segment 71 so that its outer periphery is embedded in the groove 35. Twisting the first rod segment 71 from the outside of the second end can cause the rotating shaft 33 to rotate, thereby causing the contact blade 34 to extend out of the through strip and be fixedly connected to the bone shaft cavity wall of the long bone.

[0079] It should be noted that the outer periphery shape of the groove 35 and the first rod segment 71 can be rectangular, regular polygonal, cross-shaped, etc. (Appendix) Figure 6 , 10 An example is shown where the outer periphery of the groove 35 and the first rod segment 71 is rectangular.

[0080] In a preferred embodiment, the outer diameter of the third rod segment 73 is smaller than the minor diameter of the internal threaded hole 41, and the length of the third rod segment 73 is greater than the length of the internal threaded hole 41. The distance between the first rod segment 71 and the limiting part can be adjusted by translating the third rod segment 73 along the opening direction of the internal threaded hole 41. The sum of the lengths of the first rod segment 71 and the second rod segment 72 is less than the distance from the first end to the second end of the base 4. The length of the second rod segment 72 is not less than the length of the internal threaded hole 41. Therefore, after the third rod segment 73 of the supporting adjusting rod 7 extends from the first end of the base 4 through the internal threaded hole 41 to the second end of the base 4, the aforementioned operations of forming a threaded seal connection between the base 4 and the limiting part via the first external thread 43 and the internal thread 36, and of conveying the limiting part to a predetermined position within the long bone shaft cavity and using the first rod segment 71 to drive the limiting part to be fixedly connected to the shaft cavity wall of the long bone, can be performed.

[0081] In a preferred embodiment, the reset mesh sleeve 6 has a solid portion 8 and a mesh portion surrounding and connected to the outer periphery of the solid portion, the solid portion 8 being fixedly connected to the support adjustment rod 7; wherein, the threading hole 61 is located in the area between adjacent mesh holes on the reset mesh sleeve 6.

[0082] In a preferred embodiment, the diameter of the thread-through hole 61 ranges from 1.5mm to 2.5mm, providing sufficient space for the elastic suture 5 to be threaded through. Preferably, the diameter of the thread-through hole 61 ranges from 1.6mm to 2.4mm; more preferably, from 1.7mm to 2.3mm; even more preferably, from 1.8mm to 2.2mm; even more preferably, from 1.9mm to 2.1mm; and even more preferably, from 2.0mm.

[0083] In a preferred embodiment, the solid portion 8 is wrapped with a metal sheet core, the material of which is selected from titanium, titanium alloy, stainless steel or cobalt-chromium alloy.

[0084] It should be noted that the solid part 8 is provided with a through hole, and the portion of the through hole located in the metal sheet sandwich is provided with an internal thread. The end of the third rod segment 73 facing away from the second rod segment 72 is provided with an external thread that mates with the internal thread of the metal sheet sandwich. After the third rod segment 73 passes through the through hole provided in the solid part 8, it can be further fixed by bolts or closed nuts. Thus, the operator can complete the fixation of the third rod segment 73 and the solid part 8 after the third rod segment 73 extends a suitable length beyond the second end of the base 4. It is particularly important that after the third rod segment 73 is fixed to the solid part 8, the solid part 8 needs to be located at the position to be reduced of the bone end fracture fragment. Here, the solid part 8 can serve as a stable anchor point for the bone end fracture fragment at the position to be reduced. In actual operation, the third rod segment 73 can also penetrate through one bone end fracture fragment, thereby providing mechanical support for the remaining bone end fracture fragments.

[0085] In a preferred embodiment, the third rod segment 73, under the screwing action of the second external thread 74 and the internal thread hole 41, adjusts the length extending from the second end to correspond to the position to be reset when the bone fragment is pressed by the repositioning mesh.

[0086] In the actual use of fixation devices for long bone fractures, the following steps can be followed:

[0087] 1. A predetermined number of polyester (Polyester) braided elastic sutures or ultra-high strength nylon elastic sutures are set according to the fixation requirements of long bone fractures. One end of the elastic suture is knotted, and the other end extends out from the hole 42 opened at the second end of the base 4. The knotted end of the elastic suture is intercepted by the hole 42.

[0088] 2. Extend the third rod section 73 of the support adjustment rod 7 from the first end of the base 4 through the internal thread hole 41 to the second end of the base 4. Adjust the third rod section 73 on the outside of the second end and embed the outer periphery of the first rod section 71 into the groove 35 provided on the end face of the rotating shaft 33 facing the base 4.

[0089] 3. The base 4 and the limiting part are fixedly connected by a threaded seal through the first external thread 43 and the internal thread 36. The limiting part is transported to the predetermined position in the inner cavity of the long bone shaft and the limiting part is driven by the first rod segment 71, so that the rotating shaft 33 rotates, causing the other end of the abutting blade 34 to extend out from the through strip and abut against the wall of the bone shaft cavity, thus completing the fixed connection between the limiting part and the inner cavity of the long bone shaft at the predetermined position.

[0090] 4. Based on the position to be reduced corresponding to the fracture fragment at the bone end, adjust the length of the third rod segment 73 extending from the second end under the screwing action of the second external thread 74 and the internal thread hole 41. Pass the end of the third rod segment 73 with the external thread through the bone end with the through hole and the solid part 8, and fix the relative position of the bone end, the solid part 8 and the third rod segment 73 with bolts or closed nuts.

[0091] 5. Using the solid part 8 as the anchor point, the bone end fracture fragments and elastic sutures are sequentially connected from the middle to the periphery. Specifically, taking the bone end fracture fragment closest to the solid part 8 at the position to be reduced as an example, micro-holes are made on the bone end fracture fragment. The elastic sutures extending from the hole 42 at the second end of the base 4 are sequentially passed through the micro-holes and the threading holes 61 on the reduction mesh sleeve 6. To enhance the connection effect between the bone end fracture fragment and the reduction mesh sleeve 6, the elastic sutures can pass through the bone end fracture fragment again through other threading holes 61 after passing through the threading hole 61 for the first time. After passing through the threading hole 61 for the i-th time, the tension of the elastic suture 5 is manually adjusted and locked by knotting, so that the bone end fracture fragment is pressed into the position to be reduced by the reduction mesh sleeve 6. The i-th number is odd and i≥3; Appendix Figure 13 The case where i=3 is shown;

[0092] The knot locking can be accomplished by the suture pusher disclosed in Chinese patent CN219289558U, or a similar knotter, which will not be described in detail here.

[0093] 6. Perform the operation of step 5 on the remaining bone fragments in sequence, and use the parachute-shaped reduction net 6 to press all the bone fragments into the position to be reduced.

[0094] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fixation device for long bone fractures, characterized in that, The fixing device includes: A limiting part is fixedly connected to the inner wall of the diaphysis cavity of the long bone; The base has a first end and a second end disposed opposite to each other. The first end is fixedly connected to a limiting part, and the second end has a hole and an internal threaded hole extending toward the first end. Elastic sutures, wherein one end of multiple elastic sutures is intercepted by the hole to be fixed to the base, and the other end extends out of the hole; A flexible repositioning mesh sleeve, wherein the flexible repositioning mesh sleeve is a flexible sheet material that can be implanted into the human body, and multiple elastic suture thread holes are discretely distributed on the flexible repositioning mesh sleeve; A support adjustment rod is provided, with one side threadedly connected to an internal threaded hole and the other side fixedly connected to a flexible reset mesh sleeve; wherein... The support adjustment rod includes a first rod segment, a second rod segment, and a third rod segment arranged in sequence. The first rod segment is used to drive the limiting part to be fixedly connected to the inner wall of the bone shaft cavity of the long bone. The second rod segment is provided with a second external thread that mates with the internal threaded hole. The length of the third rod segment extending from the second end can be adjusted by the screwing action of the second external thread and the internal threaded hole. The fracture site of the long bone involves the bone end. Multiple elastic sutures extending from the second end of the base pass through the bone end fracture fragments and then fix the bone end fracture fragments to the side of the flexible reduction mesh facing the base through several suture holes. The tension of the multiple elastic sutures is adjusted and locked to press the bone end fracture fragments into the position to be reduced by the flexible reduction mesh.

2. The fixation device for long bone fractures according to claim 1, characterized in that: The limiting part includes: The shell has a semi-closed cylindrical cavity, and the shell has several through slots along its circumference; The mounting component is located in a cylindrical cavity and is fixedly connected to the shell; A rotating shaft, which passes through the mounting component and is rotatably connected to the mounting component; The abutting blade has one end fixed to the circumferential surface of the rotating shaft, and the other end movably disposed in or protruding from the through-slot.

3. The fixation device for long bone fractures according to claim 2, characterized in that: The cylindrical cavity has internal threads on the side of its wall facing the base, and is closed on the side away from the base. The first end of the base is provided with a first external thread, which matches the internal thread. The base and the limiting part are connected by a threaded seal through the first external thread and the internal thread.

4. A fixation device for long bone fractures according to claim 3, characterized in that: The outer diameter of the third rod segment is smaller than the minor diameter of the internal threaded hole, and the length of the third rod segment is greater than the length of the internal threaded hole. The distance between the first rod segment and the limiting part can be adjusted by translating the third rod segment along the opening direction of the internal threaded hole.

5. A fixation device for long bone fractures according to claim 4, characterized in that: Both the internal threaded hole and the rotating shaft are located on the axis of the cylindrical cavity. The end face of the rotating shaft facing the base has a groove, and the outer periphery of the first rod segment can be embedded in the groove. When the outer periphery of the first rod segment is embedded in the groove, the rotating shaft can be rotated by twisting the first rod segment from the outside of the second end, thereby causing the abutting blade to extend out from the through strip and be fixedly connected to the bone shaft cavity wall of the long bone.

6. A fixation device for long bone fractures according to claim 5, characterized in that: The flexible sheet has a solid portion and a mesh portion that surrounds and connects to the outer periphery of the solid portion. The solid portion is fixedly connected to the support adjustment rod. The threading hole is located in the area between adjacent mesh holes on the reset mesh sleeve.

7. A fixation device for long bone fractures according to claim 6, characterized in that: The solid part is enclosed by a metal sheet core, the metal sheet core being made of any one of titanium, titanium alloy, stainless steel or cobalt-chromium alloy.

8. A fixation device for long bone fractures according to claim 7, characterized in that: The length of the third rod segment extending from the second end is adjusted by the screwing action of the second external thread and the internal thread hole to correspond to the position to be reset when the bone fragment is pressed by the repositioning mesh.

9. A fixation device for long bone fractures according to claim 8, characterized in that: The limiting part also includes an anti-reverse rotation component, which is a ratchet and pawl structure. The ratchet is disposed on the surface of the rotating shaft, and the pawl is disposed on the wall of the cylindrical cavity.

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