External positioning and guiding device for pelvic fracture channel screws

Abstract

This application discloses an external positioning and guiding device for pelvic fracture channel screws. This application achieves a first repositioning of the lesion location through a percutaneous positioning guide plate with multiple spaced positioning perforations and multiple first positioning tubes connected to the base body, each equipped with a positioning and guiding component. The first positioning tubes pass through corresponding positioning perforations, abutting against the patient's iliac bone, thus achieving a second repositioning of the lesion location. Multiple first positioning pins pass through corresponding first positioning tubes and connect to the patient's iliac bone, achieving stable connection and limitation of the base body based on dual positioning, preventing base body displacement. Finally, by connecting the positioning guide tubes to the base body and passing the channel screws through the positioning guide tubes, connecting the affected and healthy iliac bones, the channel screws are positioned and oriented.

Description

Technical Field

[0001] This application relates to the field of orthopedic medical device technology, and more specifically, to an external positioning and guiding device for a pelvic fracture channel screw. Background Technology

[0002] Because pelvic fractures are adjacent to many important tissues and organs, traditional pelvic fracture surgery involves cutting into the tissues near the fracture and directly visualizing the injured area for fixation and reduction. This is complex and can easily damage important blood vessels and nerves. Therefore, traditional pelvic fracture surgery is difficult, time-consuming, involves a lot of bleeding, and carries high risks, posing a significant challenge to both the surgeon and the patient.

[0003] Currently, minimally invasive positioning combined with channel screw fixation is gradually becoming the mainstream treatment for pelvic fracture fixation and reduction. In existing minimally invasive treatments, an attachment positioning structure needs to be placed on the side of the guide plate facing the iliac bone (i.e., the inner side of the guide plate). This attachment positioning structure positions the guide plate by contacting the surface of the iliac bone. However, this positioning method still suffers from a large incision area and unstable positioning, and it is not external positioning. Therefore, it increases the surgical difficulty for the surgeon and prolongs the patient's recovery period. Thus, the existing positioning method needs further improvement. Summary of the Invention

[0004] The main objective of this application is to provide an external positioning and guiding device for pelvic fracture channel screws, so as to solve the problem that the implantation of channel screws in the prior art requires in-body positioning.

[0005] This application provides an external positioning and guiding device for pelvic fracture channel screws, the device comprising:

[0006] A percutaneous positioning guide plate is configured to have multiple positioning perforations spaced apart. The percutaneous positioning guide plate has a first surface and a second surface. The first surface is in contact with the skin surface on the ventral side of the pelvis, and the second surface is away from the skin surface on the ventral side of the pelvis. The multiple positioning perforations penetrate the percutaneous positioning guide plate in a direction from the second surface to the first surface.

[0007] The positioning and guiding assembly includes a base frame body, multiple first positioning tubes, multiple first positioning pins, and a positioning guide tube. The multiple first positioning tubes are respectively connected to the base frame body. Each first positioning tube passes through a corresponding positioning perforation, and the end of each first positioning tube away from the base frame body abuts against the iliac bone. The multiple first positioning pins pass through a first positioning tube and are connected to the iliac bone. The positioning guide tube is connected to the base frame body.

[0008] A channel screw passes through the positioning guide tube and connects to the affected iliac bone and the healthy iliac bone.

[0009] Furthermore, the transdermal positioning guide plate includes a guide plate body and multiple positioning posts, the multiple positioning posts being respectively connected to the second surface of the guide plate body, and each positioning post and the guide plate body together form a positioning perforation.

[0010] Furthermore, the percutaneous positioning guide plate is constructed with three positioning perforations, and at least some of the positioning perforations are oriented differently.

[0011] Furthermore, the positioning guide assembly includes three first positioning tubes, each of which has a first abutting surface. Each first abutting surface abuts against the iliac bone, and the contour of each first abutting surface matches the outer contour of the corresponding iliac bone.

[0012] Furthermore, two of the first positioning pins are respectively connected to the iliac bone corresponding to the anterior superior iliac spine, and the other first positioning pin is connected to the iliac bone corresponding to the anterior inferior iliac spine.

[0013] Furthermore, the transdermal positioning guide plate is also configured to form multiple first avoidance zones;

[0014] The positioning and guiding assembly also includes multiple second positioning tubes and multiple second positioning pins. The multiple second positioning tubes are respectively connected to the base body and correspond to a first avoidance area. Each second positioning pin passes through a second positioning tube and is connected to the iliac bone.

[0015] Furthermore, the positioning guide assembly includes three second positioning tubes, and at least some of the second positioning tubes have different orientations.

[0016] Furthermore, the base frame body includes a first frame, the first frame includes a first positioning frame, a second positioning frame and a third positioning frame, the first positioning frame and the second positioning frame are connected in an alternating manner, and the first part and the second part of the second positioning frame are located on both sides of the first positioning frame, the third positioning frame is connected to one end of the first positioning frame, and is located on the same side of the first positioning frame together with the first part or the second part.

[0017] The first positioning frame has three first positioning tubes spaced apart, and the first part, the second part and the third positioning frame are each provided with a second positioning tube.

[0018] Furthermore, the first positioning tube is located at the connection between the first positioning frame and the second positioning frame.

[0019] Furthermore, the three second positioning pins are respectively inclinedly connected to the iliac bone, and the two second positioning pins on the second positioning frame are respectively connected to the iliac bones on both sides of the anterior superior iliac spine, and the second positioning pin on the third positioning frame is connected to the iliac bone on the side of the anterior superior iliac spine close to the anterior inferior iliac spine.

[0020] Furthermore, each of the first positioning tubes has a first end and a second end, the first end of each of the first positioning tubes passes through the positioning perforation and abuts against the iliac bone, and the second end of each of the first positioning tubes extends out of the first positioning frame.

[0021] The base frame body also includes a second frame and at least two positioning connecting pipes. The positioning guide pipe and the two positioning connecting pipes are respectively connected to the second frame, and the at least two positioning connecting pipes are respectively sleeved on the second end of a first positioning pipe.

[0022] Furthermore, the second frame, the positioning guide tube, the third positioning frame, and one of the first and second parts are located on the same side of the first positioning frame.

[0023] Furthermore, the positioning guide assembly also includes multiple third positioning tubes and multiple limiting members. Each of the third positioning tubes passes through a second positioning tube and abuts against the iliac bone. Each of the limiting members is threaded into a second positioning tube and abuts against the third positioning tube in the corresponding second positioning tube.

[0024] Each of the second positioning tubes contains a third positioning tube and a limiting member, which together form a positioning guide channel. Each of the second positioning pins passes through a positioning guide channel and connects to the iliac bone.

[0025] Furthermore, each of the third positioning tubes has a second abutting surface, each second abutting surface abutting against the iliac bone, and the contour of each second abutting surface matches the outer contour of the corresponding iliac bone.

[0026] Furthermore, each of the second positioning tubes has a second positioning hole, the second positioning hole including a limiting hole and a threaded hole, the limiting hole being close to the transcutaneous positioning guide plate and the limiting hole restricting the rotation of the third positioning tube, the threaded hole being away from the transcutaneous positioning guide plate, and the limiting member being threadedly connected in the threaded hole.

[0027] Furthermore, the limiting hole restricts the third positioning tube from passing through in a specified orientation, so that each of the second abutting surfaces abuts against the corresponding iliac bone in a preset contact surface.

[0028] Furthermore, the connection between the limiting hole and the threaded hole has a limiting surface facing the threaded hole. When the end face of the limiting member entering the third end of the threaded hole abuts against the limiting surface, the third positioning tube passing through the limiting hole is positioned at a designated position.

[0029] Furthermore, the limiting member also has a fourth end, which is opposite to the third end. The fourth end has a limiting portion, which limits the threaded hole to one end away from the limiting hole when the end face of the third end of the limiting member abuts the limiting surface.

[0030] Furthermore, the transdermal positioning guide plate also has a second avoidance area;

[0031] The channel screw passes sequentially through the positioning guide tube and the second clearance area, and connects to the affected iliac bone and the healthy iliac bone.

[0032] Furthermore, after the channel screw is connected to the affected and healthy iliac bones, the percutaneous positioning guide plate and the positioning guide assembly will be removed.

[0033] This application constructs a plurality of spaced positioning perforations on the percutaneous positioning guide plate, with each perforation penetrating the percutaneous positioning guide plate along the direction from the second surface to the first surface. Multiple first positioning tubes, provided with the positioning guide assembly, are respectively connected to the base body. This allows for a first repositioning of the lesion location via the percutaneous positioning guide plate. Each first positioning tube passes through a corresponding positioning perforation, so that each first positioning tube abuts against the patient's iliac bone, thereby achieving a second repositioning of the lesion location. Furthermore, by passing multiple first positioning needles through corresponding first positioning tubes and connecting them to the patient's iliac bone, a dual positioning effect is achieved. Based on this, a stable connection and limiting of the percutaneous positioning guide plate, the main body of the base frame, and the first positioning tube are achieved, preventing the main body of the base frame from deviating. By connecting the positioning guide tube to the main body of the base frame and passing the channel screw through the positioning guide tube, and connecting the patient's affected iliac bone and the healthy iliac bone, the positioning and orientation of the channel screw is achieved. Only multiple first positioning tubes and multiple first positioning pins are used to enter the patient's body, avoiding the large-area wounds found in existing technologies, and avoiding the need for the surgeon to gradually correct the implantation trajectory of the channel screw under years of clinical experience and multiple scans of fluoroscopy during the operation. This reduces the difficulty of the operation, improves the efficiency of the operation, and improves the efficiency of the patient's wound recovery. Attached Figure Description

[0034] Figure 1This is a schematic diagram of the connection between the device and the pelvis in one embodiment of this application.

[0035] Figure 2 This is a schematic diagram of the apparatus in one embodiment of this application.

[0036] Figure 3 This is a schematic diagram of a percutaneous positioning guide plate in one embodiment of this application.

[0037] Figure 4 This is a schematic diagram of a positioning guide component in one embodiment of this application.

[0038] Figure 5 This is a cross-sectional view of a channel screw passing through the pelvis in one embodiment of this application.

[0039] Figure 6 This is a cross-sectional view showing the connection between the second frame and the first frame in one embodiment of this application.

[0040] Figure 7 This is a cross-sectional view of the second positioning pin passing through the second positioning frame in one embodiment of this application.

[0041] Figure 8 for Figure 7 Enlarged diagram of point A in the middle.

[0042] Figure 9 This is a cross-sectional view of the first frame in one embodiment of this application.

[0043] Figure 10 This is a cross-sectional view of a portion of the structure of the positioning guide component in one embodiment of this application.

[0044] Figure 11 for Figure 10 Enlarged diagram of point B in the middle.

[0045] The above figures include the following reference numerals:

[0046] Device 100, percutaneous positioning guide plate 10, guide plate body 11, positioning post 12, positioning perforation 13, first surface 14, second surface 15, first clearance area 16, second clearance area 17, positioning guide assembly 20, base frame body 21, first frame 211, first positioning frame 2111, second positioning frame 2112, first part 21121, second part 21122, third positioning frame 2113, second frame 212, positioning connecting pipe 213, First positioning tube 22, First end 221, Second end 222, First abutting surface 223, First positioning pin 23, Positioning guide tube 24, Second positioning tube 25, Second positioning hole 251, Limiting hole 2511, Threaded hole 2512, Limiting surface 2513, Second positioning pin 26, Third positioning tube 27, Second abutting surface 271, Limiting member 28, Third end 281, Fourth end 282, Positioning guide channel 29, Channel screw 30. Detailed Implementation

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0050] Please see Figure 1-4As shown, this application provides an external positioning and guiding device 100 for a pelvic fracture channel screw. The device 100 includes a percutaneous positioning guide plate 10, a positioning and guiding component 20, and a channel screw 30. The percutaneous positioning guide plate 10 and the positioning and guiding component 20 are respectively used for first repositioning and second repositioning of the channel screw 30, so that the channel screw 30 can accurately connect the patient's healthy iliac bone and the affected iliac bone according to a preset implantation trajectory.

[0051] Please see Figure 3 As shown, the percutaneous positioning guide plate 10 is constructed with a plurality of positioning perforations 13, which are spaced apart. The percutaneous positioning guide plate 10 has a first surface 14 and a second surface 15. The first surface 14 is in contact with the ventral skin surface of the pelvis and is made by 3D printing based on the contour of the patient's ventral skin surface, so as to accurately match the contour of the patient's ventral skin surface and thus achieve the first repositioning. The second surface 15 is away from the ventral skin surface of the pelvis, and the plurality of positioning perforations 13 penetrate the percutaneous positioning guide plate 10 in the direction from the second surface 15 to the first surface 14.

[0052] Please see Figure 2-4 As shown, the positioning and guiding assembly 20 includes a base frame body 21, multiple first positioning tubes 22, multiple first positioning pins 23, and a positioning guide tube 24. The multiple first positioning tubes 22 are respectively connected to the base frame body 21, each first positioning tube 22 passing through a corresponding positioning perforation 13, and the end of each first positioning tube 22 away from the base frame body 21 abutting against the iliac bone. The multiple first positioning pins 23 pass through a first positioning tube 22 and connect to the iliac bone. The positioning guide tube 24 is connected to the base frame body 21. The base frame body 21 is manufactured using 3D printing technology to ensure structural strength and precision while also ensuring good biocompatibility, avoiding rejection between the base frame body 21 and the patient's body tissues.

[0053] Please see Figure 1 As shown, the channel screw 30 passes through the positioning guide tube 24 and connects to the affected iliac bone and the healthy iliac bone, thereby fixing the affected iliac bone to the patient's healthy iliac bone through the channel screw 30.

[0054] This application constructs a plurality of spaced positioning perforations 13 on the percutaneous positioning guide plate 10, with each positioning perforation 13 penetrating the percutaneous positioning guide plate 10 along the direction from the second surface 15 to the first surface 14. Multiple first positioning tubes 22 of the positioning guide assembly 20 are respectively connected to the base body 21. This allows for a first repositioning of the lesion location via the percutaneous positioning guide plate 10. Each first positioning tube 22 passes through a corresponding positioning perforation 13, so that each first positioning tube 22 abuts against the patient's iliac bone, thereby achieving a second repositioning of the lesion location. Furthermore, multiple first positioning needles 23 pass through corresponding first positioning tubes 22 and connect to the patient's iliac bone, thereby achieving a second repositioning of the lesion location. Based on repositioning, a stable connection and limiting of the percutaneous positioning guide plate 10, the base frame body 21, and the first positioning tube 22 are achieved, preventing the base frame body 21 from deviating. By connecting the positioning guide tube 24 to the base frame body 21 and passing the channel screw 30 through the positioning guide tube 24, and connecting the patient's affected and healthy iliac bones, the positioning and orientation of the channel screw 30 are achieved. Only multiple first positioning tubes 22 and multiple first positioning pins 23 are used to enter the patient's body, avoiding the large-area wounds found in existing technologies and avoiding the need for the surgeon to gradually correct the implantation trajectory of the channel screw 30 under multiple scans and fluoroscopy based on years of clinical experience during the operation. This reduces the difficulty of the operation, improves the efficiency of the operation, and improves the efficiency of the patient's wound recovery.

[0055] In addition, by scanning the patient's ventral pelvic skin in advance to obtain the patient's ventral pelvic skin data, and after reconstructing the patient's skin model in three dimensions, the percutaneous positioning guide plate 10 that matches the patient's ventral pelvic skin is prepared based on the skin model using 3D printing technology.

[0056] Please see Figure 3 As shown in the embodiment of this application, the percutaneous positioning guide plate 10 includes a guide plate body 11 and multiple positioning posts 12. The multiple positioning posts 12 are respectively connected to the second surface 15 of the guide plate body 11, and each positioning post 12 and the guide plate body 11 together form a positioning perforation 13.

[0057] Furthermore, each of the positioning posts 12 is opposite to the first surface 14. Therefore, when the percutaneous positioning guide plate 10 is placed on the ventral side of the patient's pelvis, each of the positioning posts 12 will not enter the patient's body, thus further reducing the number of incisions made on the ventral side of the patient.

[0058] By setting multiple positioning posts 12, the length of each positioning perforation 13 can be effectively extended, thereby effectively improving the positioning and limiting effect of the percutaneous positioning guide plate 10 on each of the first positioning tubes 22. This allows each of the first positioning tubes 22 to abut against the iliac bone along a specified path, and on this basis, allows each of the first positioning needles 23 to accurately enter the patient's body and connect to the specified position on the iliac bone.

[0059] Please see Figure 2-3 As shown in the embodiments of this application, the percutaneous positioning guide plate 10 is constructed with three positioning perforations 13, and at least some of the positioning perforations 13 have different orientations. Because the three positioning perforations 13 have different orientations, the three first positioning tubes 22 connected to the base body 21 enter the patient's body and abut against the iliac bone at different positions, thereby enabling effective positioning of the channel screw 30 implantation trajectory based on multi-angle positioning and simultaneous abutment, and improving positioning accuracy.

[0060] Please see Figure 2-4 As shown in the embodiments of this application, the positioning guide component 20 includes three first positioning tubes 22, each of the first positioning tubes 22 having a first abutting surface 223, each of the first abutting surfaces 223 abutting against the iliac bone, and the contour of each first abutting surface 223 matching the outer contour of the corresponding iliac bone.

[0061] Since each of the first positioning tubes 22 enters the patient's body in a different orientation, the contact surface of each first positioning tube 22 against the iliac bone is also different. Therefore, based on the pre-planning of the implantation path of each first positioning tube 22 and the scanning and determination of the iliac bone to determine the outer contour of the iliac bone, and by setting the contour of the first contact surface 223 of each first positioning tube 22 to match the outer contour of the corresponding iliac bone, it can be ensured that each first positioning tube 22 can accurately enter the patient's body along its respective implantation path and fit against the corresponding iliac bone surface, thereby ensuring the accuracy and precision of positioning. Furthermore, the large contact area between the first contact surface 223 and the iliac bone can also ensure the stability of the contact between each first positioning tube 22 and the iliac bone.

[0062] Please see Figure 5-6As shown in the embodiments of this application, two first positioning pins 23 are respectively connected to the iliac bone corresponding to the anterior superior iliac spine, and another first positioning pin 23 is connected to the iliac bone corresponding to the anterior inferior iliac spine. By connecting each first positioning pin 23 to different positions on the iliac bone, each first positioning pin 23 can connect to the iliac bone from different angles, thereby ensuring that each first positioning pin 23, under the limitation of the positioning guide component 20 and the percutaneous positioning guide plate 10, and under the connection with the iliac bone, can position the base body 21 in a designated position, thereby enabling the positioning guide tube 24 to be positioned in a designated position, and thus enabling the channel screw 30 to be accurately connected to the affected iliac bone and the healthy iliac bone according to the preset implantation path under the positioning of the positioning guide tube 24.

[0063] Please see Figure 3 As shown in the embodiments of this application, the percutaneous positioning guide plate 10 is further configured with a plurality of first avoidance zones 16, which are spaced apart; the positioning guide assembly 20 also includes a plurality of second positioning tubes 25 and a plurality of second positioning pins 26, the number of the second positioning tubes 25 and the second positioning pins 26 being the same as the number of the first avoidance zones 16 and corresponding one-to-one. The plurality of second positioning tubes 25 are respectively connected to the base body 21 and each corresponds to a first avoidance zone 16, and each second positioning pin 26 passes through a second positioning tube 25 and connects to the iliac bone.

[0064] By setting multiple first avoidance zones 16, the implantation of the corresponding second positioning pin 26 can be positioned within a small range through each first avoidance zone 16; in addition, by setting multiple second positioning tubes 25 to guide the corresponding second positioning pin 26 through, each second positioning pin 26 can connect with the iliac bone according to a preset path, thereby achieving further positioning and fixation of the base frame body 21, so that the base frame body 21 can more stably position the channel screw 30.

[0065] Furthermore, multiple second positioning tubes 25 are integrally connected to the base frame body 21 using 3D printing technology, thereby enabling the second positioning tubes 25 and the base frame body 21 to maintain a preset connection position, so that each second positioning tube 25 can be passed through the corresponding second positioning pin 26 along a preset orientation, and thus enabling each second positioning pin 26 to pass through the corresponding second positioning tube 25 along a preset path and connect with the iliac bone.

[0066] Please see Figure 2-6As shown in the embodiments of this application, the positioning guide component 20 includes three second positioning tubes 25, and at least some of the second positioning tubes 25 have different orientations. By setting at least some of the second positioning tubes 25 to have different orientations, each second positioning tube 25 can guide the corresponding second positioning pin 26 to connect with the iliac bone along different orientations, thereby enabling the base body 21 to achieve more connections with different angles with the iliac bone, and thus enabling the base to be positioned more stably and accurately at the designated position.

[0067] Furthermore, the three second positioning tubes 25 are arranged in different orientations.

[0068] Please see Figure 4 As shown in the embodiments of this application, the base frame body 21 includes a first frame 211, the first frame 211 includes a first positioning frame 2111, a second positioning frame 2112 and a third positioning frame 2113. The first positioning frame 2111, the second positioning frame 2112 and the third positioning frame 2113 are all double-layer structures, so that the first positioning frame 2111, the second positioning frame 2112 and the third positioning frame 2113 all have reliable structural strength.

[0069] The first positioning frame 2111 and the second positioning frame 2112 are connected in an alternating manner, and the first part 21121 and the second part 21122 of the second positioning frame 2112 are located on both sides of the first positioning frame 2111. The third positioning frame 2113 is connected to one end of the first positioning frame 2111 and is located on the same side of the first positioning frame 2111 together with the first part 21121 or the second part 21122.

[0070] The first positioning frame 2111 has three first positioning tubes 22 spaced apart, and the first part 21121, the second part 21122 and the third positioning frame 2113 are respectively provided with a second positioning tube 25.

[0071] By distributing three first positioning tubes 22 on the first positioning frame 2111 and three second positioning tubes 25 on the second positioning frame 2112 and the third positioning frame 2113, the three first positioning needles 23 and the three second positioning needles 26 can be spaced apart and connected to different positions on the iliac bone. This design not only facilitates needle insertion by the surgeon, but also allows the base frame body 21 to be positioned at different designated positions by each of the first positioning needles 23 and each of the second positioning needles 26.

[0072] Please see Figure 4-5As shown in the embodiment of this application, a first positioning tube 22 is located at the connection between the first positioning frame 2111 and the second positioning frame 2112. Therefore, the first positioning pin 23 corresponding to the first positioning tube 22 can serve as a positioning reference.

[0073] In the embodiments of this application, three second positioning pins 26 are respectively inclinedly connected to the iliac bone, and two second positioning pins 26 located on the second positioning frame 2112 are respectively connected to the iliac bones on both sides of the anterior superior iliac spine, and one second positioning pin 26 located on the third positioning frame 2113 is connected to the iliac bone on the side of the anterior superior iliac spine close to the anterior inferior iliac spine. Therefore, the three second positioning pins 26 can extend approximately in the same geometric center direction, thereby enabling the three second positioning pins 26 to restrain each other, and thus enabling the three second positioning pins 26 to position the base frame body 21 in a designated position.

[0074] In the embodiments of this application, each of the first positioning tubes 22 has a first end 221 and a second end 222, the first end 221 of each of the first positioning tubes 22 passes through the positioning perforation 13 and abuts against the iliac bone, and the second end 222 of each of the first positioning tubes 22 extends out of the first positioning frame 2111.

[0075] Please see Figure 6-7 As shown, the base frame body 21 also includes a second frame 212 and at least two positioning connecting pipes 213. The positioning guide pipe 24 and the two positioning connecting pipes 213 are respectively connected to the second frame 212, and at least two positioning connecting pipes 213 are respectively sleeved on the second end 222 of a first positioning pipe 22. The second frame 212 has a double-layer structure to ensure reliable structural strength.

[0076] By setting the second frame 212, the first frame 211 can be positioned in a designated position by the three first positioning pins 23 and the three second positioning pins 26 before the second frame 212 is connected to the first frame 211. This makes the positioning operation of the first frame 211 simpler, and the separate setting of the second frame 212 and the first frame 211 facilitates the 3D printing preparation of the base frame body 21.

[0077] Please see Figure 4As shown in the embodiment of this application, the second frame 212, the positioning guide tube 24, the third positioning frame 2113, and one of the first part 21121 and the second part 21122 are located on the same side of the first positioning frame 2111. This allows the first frame 211 to be stably supported and positioned on the side closest to the second frame 212 by a second positioning pin 26 corresponding to one of the first part 21121 and the second part 21122, and a second positioning pin 26 corresponding to the third positioning frame 2113. This ensures that the second frame 212 can be stably connected to the first frame 211, and that the positioning guide tube 24 is stably positioned at the specified position.

[0078] In the embodiments of this application, the positioning guide component 20 further includes multiple third positioning tubes 27 and multiple limiting members 28. Each of the third positioning tubes 27 passes through a second positioning tube 25 and abuts against the iliac bone. Each of the limiting members 28 is threaded into a second positioning tube 25 and abuts against the corresponding third positioning tube 27 in the second positioning tube 25.

[0079] Please see Figure 7-9 As shown, a third positioning tube 27 and a limiting member 28 in each of the second positioning tubes 25 are used to form a positioning guide channel 29. Each of the second positioning pins 26 passes through a positioning guide channel 29 and connects to the iliac bone.

[0080] By setting the third positioning tube 27 and the limiting member 28, each second positioning pin 26 can accurately pass through the corresponding positioning guide channel 29 and be stably connected to the iliac bone. At the same time, by setting the third positioning tube 27, each second positioning pin 26 can achieve preliminary positioning by abutting against the iliac bone through the third positioning tube 27 before connecting with the iliac bone, thereby further improving the accuracy of the connection between each second positioning pin 26 and the corresponding position of the iliac bone.

[0081] Please see Figure 4 As shown in the embodiments of this application, each of the third positioning tubes 27 has a second abutting surface 271, each second abutting surface 271 abutting against the iliac bone, and the contour of each second abutting surface 271 matches the outer contour of the corresponding iliac bone.

[0082] Since each of the third positioning tubes 27 enters the patient's body in a different orientation, the contact surface of each third positioning tube 27 against the iliac bone is also different. Therefore, based on the pre-planning of the implantation path of each third positioning tube 27 and the scanning and determination of the iliac bone to determine its outer contour, and by setting the contour of the second contact surface 271 of each third positioning tube 27 to match the outer contour of the corresponding iliac bone, it can be ensured that each third positioning tube 27 can accurately enter the patient's body along its respective implantation path and fit against the corresponding iliac bone surface. This ensures the accuracy and precision of the positioning. Furthermore, the larger contact area between the second contact surface 271 and the iliac bone ensures the stability of the contact between each third positioning tube 27 and the iliac bone, thereby improving the accuracy of the position of the second positioning needle 26 connecting to the iliac bone through the third positioning tube 27.

[0083] Please see Figure 8-9 As shown in the embodiments of this application, each of the second positioning tubes 25 has a second positioning hole 251, which includes a limiting hole 2511 and a threaded hole 2512. The limiting hole 2511 is close to the percutaneous positioning guide plate 10 and can restrict the rotation of the third positioning tube 27, so that each of the third positioning tubes 27 can pass through the second positioning tube 25 in a preset direction and orientation, thereby allowing each of the second abutment surfaces 271 to fit against the corresponding iliac bone outer contour. The threaded hole 2512 is away from the percutaneous positioning guide plate 10, and the limiting member 28 is threadedly connected in the threaded hole 2512 so that the limiting member 28 can limit the third positioning tube 27.

[0084] In an embodiment of this application, the limiting hole 2511 restricts the third positioning tube 27 from passing through in a specified orientation so that each of the second abutting surfaces 271 abuts against the corresponding iliac bone in a preset contact surface.

[0085] The limiting hole 2511 restricts the insertion of each third positioning tube 27 into the second positioning hole 251, thus preventing the third positioning tube 27 from passing through the second positioning hole 251 in the wrong orientation.

[0086] Please see Figure 9 As shown in the embodiment of this application, the connection between the limiting hole 2511 and the threaded hole 2512 has a limiting surface 2513 facing the threaded hole 2512. When the end face of the third end 281 of the limiting member 28 entering the threaded hole 2512 abuts against the limiting surface 2513, the third positioning tube 27 passing through the limiting hole 2511 is positioned at a designated position.

[0087] Please see Figure 7-11 As shown, when the limiting member 28 is threaded into the threaded hole 2512 and cannot rotate, the end face of the third end 281 of the limiting member 28 enters the second positioning hole 251 and abuts against the limiting surface 2513. The third positioning tube 27 is pushed to the designated position in the limiting hole 2511, and the second abutting surface 271 of the third positioning tube 27 abuts against the corresponding iliac bone.

[0088] In an embodiment of this application, the limiting member 28 further has a fourth end 282, which is opposite to the third end 281. The fourth end 282 has a limiting portion, which limits the end of the threaded hole 2512 away from the limiting surface 2511 when the end face of the third end 281 of the limiting member 28 abuts against the limiting surface 2513.

[0089] By setting the limiting part at the fourth end 282 to limit the position of the limiting member 28 entering the threaded hole 2512, and cooperating with the mutual limiting of the third end 281 and the limiting surface 2513, the limiting member 28 can be doubly limited while also allowing for a direct judgment of whether the threaded connection is in place, thereby improving the efficiency of the operator's judgment.

[0090] Please see Figure 3 As shown in the embodiments of this application, the percutaneous positioning guide plate 10 also has a second avoidance area 17; the channel screw 30 passes sequentially through the positioning guide tube 24 and the second avoidance area 17, and connects with the affected iliac bone and the healthy iliac bone. By setting the second avoidance area 17, the daily trajectory of the channel screw 30 can be positioned within a small range to avoid the channel screw 30 deviating significantly from the implantation trajectory.

[0091] In the embodiments of this application, after the channel screw 30 is connected to the affected and healthy iliac bones, the percutaneous positioning guide plate 10 and the positioning guide assembly 20 are removed. Specifically, compared to the prior art where the percutaneous positioning guide plate 10 and positioning structure cannot be directly disassembled after the channel screw 30 is implanted, this application not only facilitates the quick removal of the percutaneous positioning guide plate 10 and the positioning guide assembly 20, but also reduces the amount of medical equipment carried by the patient, facilitating patient movement.

[0092] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0093] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0094] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An external positioning and guiding device for pelvic fracture channel screws, characterized in that, include: A percutaneous positioning guide plate is configured to have multiple positioning perforations spaced apart. The percutaneous positioning guide plate has a first surface and a second surface. The first surface is in contact with the skin surface on the ventral side of the pelvis, and the second surface is away from the skin surface on the ventral side of the pelvis. The multiple positioning perforations penetrate the percutaneous positioning guide plate in a direction from the second surface to the first surface. A positioning and guiding assembly includes a base frame body, multiple first positioning tubes, multiple first positioning pins, and a positioning guide tube. The multiple first positioning tubes are respectively connected to the base frame body. Each first positioning tube passes through a corresponding positioning hole, and the end of each first positioning tube away from the base frame body abuts against the iliac bone. The multiple first positioning pins pass through a first positioning tube and are connected to the iliac bone. The positioning guide tube is connected to the base frame body. The base frame body includes a first frame, which includes a first positioning frame, a second positioning frame, and a third positioning frame. The first positioning frame and the second positioning frame are staggered, and the first part and the second part of the second positioning frame are located on both sides of the first positioning frame. The third positioning frame is connected to one end of the first positioning frame and is located on the same side of the first positioning frame together with the first part or the second part. A channel screw passes through the positioning guide tube and connects to the affected iliac bone and the healthy iliac bone.

2. The external positioning and guiding device for pelvic fracture channel screws according to claim 1, characterized in that, The transdermal positioning guide plate includes a guide plate body and multiple positioning posts. The multiple positioning posts are respectively connected to the second surface of the guide plate body, and each positioning post and the guide plate body together form a positioning perforation.

3. The external positioning and guiding device for pelvic fracture channel screws according to claim 1, characterized in that, The percutaneous positioning guide plate is constructed with three positioning perforations, and at least some of the positioning perforations are oriented differently.

4. The external positioning and guiding device for pelvic fracture channel screws according to claim 3, characterized in that, The positioning guide assembly includes three first positioning tubes, each of which has a first abutting surface. Each first abutting surface abuts against the iliac bone, and the contour of each first abutting surface matches the outer contour of the corresponding iliac bone.

5. The external positioning and guiding device for pelvic fracture channel screws according to claim 4, characterized in that, Two of the first positioning pins are connected to the iliac bone corresponding to the anterior superior iliac spine, and the other first positioning pin is connected to the iliac bone corresponding to the anterior inferior iliac spine.

6. The external positioning and guiding device for pelvic fracture channel screws according to claim 1, characterized in that, The transdermal positioning guide plate is also configured to form multiple first avoidance zones; The positioning and guiding assembly also includes multiple second positioning tubes and multiple second positioning pins. The multiple second positioning tubes are respectively connected to the base body and correspond to a first avoidance area. Each second positioning pin passes through a second positioning tube and is connected to the iliac bone.

7. The external positioning and guiding device for pelvic fracture channel screws according to claim 6, characterized in that, The positioning guide assembly includes three second positioning tubes, and at least some of the second positioning tubes are oriented differently.

8. The external positioning and guiding device for pelvic fracture channel screws according to claim 7, characterized in that, The first positioning frame has three first positioning tubes spaced apart, and the first part, the second part and the third positioning frame are each provided with one second positioning tube.

9. The external positioning and guiding device for pelvic fracture channel screws according to claim 8, characterized in that, One of the first positioning tubes is located at the connection between the first positioning frame and the second positioning frame.

10. The external positioning and guiding device for pelvic fracture channel screws according to claim 8, characterized in that, The three second positioning pins are respectively inclined to be connected to the iliac bone, and the two second positioning pins on the second positioning frame are respectively connected to the iliac bones on both sides of the anterior superior iliac spine, and the second positioning pin on the third positioning frame is connected to the iliac bone on the side of the anterior superior iliac spine close to the anterior inferior iliac spine.

11. The external positioning and guiding device for pelvic fracture channel screws according to claim 8, characterized in that, Each of the first positioning tubes has a first end and a second end, the first end of each of the first positioning tubes passes through the positioning perforation and abuts against the iliac bone, and the second end of each of the first positioning tubes extends out of the first positioning frame. The base frame body also includes a second frame and at least two positioning connecting pipes. The positioning guide pipe and the two positioning connecting pipes are respectively connected to the second frame, and the at least two positioning connecting pipes are respectively sleeved on the second end of a first positioning pipe.

12. The external positioning and guiding device for pelvic fracture channel screws according to claim 11, characterized in that, The second frame, the positioning guide tube, the third positioning frame, and one of the first and second parts are located on the same side of the first positioning frame.

13. The external positioning and guiding device for pelvic fracture channel screws according to claim 6, characterized in that, The positioning and guiding assembly also includes multiple third positioning tubes and multiple limiting members. Each of the third positioning tubes passes through a second positioning tube and abuts against the iliac bone. Each of the limiting members is threaded into a second positioning tube and abuts against the third positioning tube in the corresponding second positioning tube. Each of the second positioning tubes contains a third positioning tube and a limiting member, which together form a positioning guide channel. Each of the second positioning pins passes through a positioning guide channel and connects to the iliac bone.

14. The external positioning and guiding device for pelvic fracture channel screws according to claim 13, characterized in that, Each of the third positioning tubes has a second abutting surface, each second abutting surface abutting against the iliac bone, and the contour of each second abutting surface matches the outer contour of the corresponding iliac bone.

15. The external positioning and guiding device for pelvic fracture channel screws according to claim 14, characterized in that, Each of the second positioning tubes has a second positioning hole, which includes a limiting hole and a threaded hole. The limiting hole is close to the transcutaneous positioning guide plate and can restrict the rotation of the third positioning tube. The threaded hole is away from the transcutaneous positioning guide plate and the limiting member is threadedly connected in the threaded hole.

16. The external positioning and guiding device for pelvic fracture channel screws according to claim 15, characterized in that, The limiting hole restricts the third positioning tube from passing through in a specified orientation so that each of the second abutting surfaces abuts against the corresponding iliac bone in a preset contact surface.

17. The external positioning and guiding device for pelvic fracture channel screws according to claim 15, characterized in that, The connection between the limiting hole and the threaded hole has a limiting surface facing the threaded hole. When the end face of the limiting member entering the third end of the threaded hole abuts against the limiting surface, the third positioning tube passing through the limiting hole is positioned at a designated position.

18. The external positioning and guiding device for pelvic fracture channel screws according to claim 17, characterized in that, The limiting member also has a fourth end, which is opposite to the third end. The fourth end has a limiting part, which limits the threaded hole to one end away from the limiting hole when the end face of the third end of the limiting member abuts the limiting surface.

19. The external positioning and guiding device for pelvic fracture channel screws according to claim 1, characterized in that, The transdermal positioning guide plate also has a second avoidance zone; The channel screw passes sequentially through the positioning guide tube and the second clearance area, and connects to the affected iliac bone and the healthy iliac bone.

20. The external positioning and guiding device for pelvic fracture channel screws according to claim 1, characterized in that, After the channel screw is connected to the affected and healthy iliac bones, the percutaneous positioning guide plate and the positioning guide assembly will be removed.

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