A k-wire positioning device
By using the insertion and exit limiting mechanisms of the Kirschner wire positioning device, combined with C-arm scanning markers, accurate positioning and stable puncture of the Kirschner wire in the treatment of patellar fractures are achieved, solving the problem of patellar injury caused by repeated Kirschner wire insertions and improving rehabilitation outcomes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUINING CENT HOSPITAL
- Filing Date
- 2025-03-13
- Publication Date
- 2026-07-21
AI Technical Summary
In the treatment of patellar fractures, inaccurate insertion or exit of Kirschner wires can lead to repeated insertions, causing patellar damage and affecting the rehabilitation outcome.
A Kirschner wire positioning device is adopted, including an insertion positioning mechanism and an exit limiting mechanism, which are connected by a telescopic positioning frame. The positioning cylinder and the needle channel structure ensure the straight insertion and stable exit of the Kirschner wire, and the precise positioning is achieved by combining the C-arm scanning mark point.
It improves the accuracy of Kirschner wire insertion and exit, reduces the need for multiple insertions, lowers the risk of patellar injury, reduces the number of times the C-arm is used, and reduces radiation exposure.
Smart Images
Figure CN224523223U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of knee surgery assistance technology, specifically, a Kirschner wire positioning device. Background Technology
[0002] Patellar fractures are a common type of intra-articular fracture in clinical practice. Due to the lever effect of the patella during knee flexion and extension and its protective function on the femoral trochlea, anatomical reduction and stable fixation are crucial for restoring knee joint function. Kirschner wire tension band fixation is a classic surgical procedure for treating patellar fractures. It involves longitudinally penetrating the fracture fragment with Kirschner wires combined with circumferential compression from steel wires, effectively counteracting separation stress at the fracture ends and promoting fracture healing.
[0003] However, in current techniques for patellar fracture localization using Kirschner wires, inaccurate insertion can easily lead to multiple insertions of the Kirschner wire, resulting in repeated damage to the patella and affecting the patient's subsequent rehabilitation and prognosis. Utility Model Content
[0004] The purpose of this invention is to provide a Kirschner wire positioning device that allows the Kirschner wire to be accurately inserted and stably exited during patellar fracture treatment, thereby solving the problem of significant patellar damage caused by repeated Kirschner wire insertions due to inaccurate insertion or exit positions during existing surgeries.
[0005] To solve the above problems, the present invention adopts the following technical means: A Kirschner wire positioning device includes an insertion positioning mechanism located at the proximal end and an exit limiting mechanism located at the distal end, wherein the insertion positioning mechanism and the exit limiting mechanism are connected by a telescopic positioning frame. The insertion positioning mechanism includes a first cylindrical shell connected to the telescopic positioning frame. The first cylindrical shell has a positioning cylinder threaded through both ends and coaxially threaded. The positioning cylinder has a first needle channel coaxially constructed inside. The side wall of the first cylindrical shell has a first through groove communicating with its inner cavity along its axis. The side wall of the positioning cylinder has a second through groove communicating with the first needle channel along its axis. The insertion limiting mechanism has a through second needle channel, and the side wall of the insertion limiting mechanism has a third through groove that communicates with the second needle channel.
[0006] Preferably, the widths of the first through groove, the second through groove, and the third through groove are the same as the outer diameter of the Kirschner wire.
[0007] Furthermore, an elastic positioning tube is fitted to the arc-shaped wall opposite to the first needle channel and the second through groove. The elastic positioning tube is coaxially arranged with the second needle channel, and the first needle channel is off-axis arranged with respect to the elastic positioning tube. Specifically, the axis of the first needle channel is parallel to the axis of the elastic positioning tube, and the axis of the first needle channel is closer to the second through groove than the axis of the elastic positioning tube. An exit through groove is constructed along the axis of the side of the elastic positioning tube facing the second through groove. The inner diameter of the elastic positioning tube is the same as the inner diameter of the Kirschner wire. The width of the exit through groove is smaller than the outer diameter of the Kirschner wire. The tube walls of the elastic positioning tube on both sides of the exit through groove are separated from the inner wall of the first needle channel.
[0008] Furthermore, the outer wall of the positioning cylinder is provided with external threads, which are intermittently arranged at the position of the second through groove, and the inner wall of the first cylinder shell is provided with internal threads, which are intermittently arranged at the position of the first through groove.
[0009] Furthermore, the positioning cylinder has a first conical cylinder coaxially arranged at one end facing the through-limiting mechanism. The conical end of the first conical cylinder is disposed away from the positioning cylinder, and the conical end face of the first conical cylinder has a plurality of first serrations arranged around its axis.
[0010] Furthermore, a turntable is coaxially mounted on the outer wall of the end of the positioning cylinder away from the through-limiting mechanism, and the turntable is disconnected at the position of the second through slot.
[0011] Furthermore, the insertion limiting mechanism includes a second cylindrical shell connected to the telescopic positioning frame. The second cylindrical shell has a second conical cylinder coaxially formed at one end facing the first cylindrical shell. The second needle channel coaxially penetrates the second cylindrical shell and the second conical cylinder. The third through groove is provided through the side wall of the second cylindrical shell and the second conical cylinder.
[0012] Furthermore, the second conical cylinder has a plurality of second serrations around its axis on the end face facing the first cylinder shell.
[0013] Furthermore, the telescopic positioning frame includes a first L-plate connected to the top surface of the first cylindrical shell and a second L-plate connected to the top surface of the through-limiting mechanism. The horizontal section of the second L-plate is constructed with a horizontally penetrating insertion groove. A sliding plate that slides into the insertion groove is installed at the end of the horizontal section of the first L-plate. A threaded rod is constructed on the sliding plate, and a clamping nut is threaded on the threaded rod. The clamping nut abuts against the horizontal section of the second L-plate.
[0014] This utility model has the following beneficial effects during use: During the surgery, the patient's patella is first scanned using a C-arm optics system. The locations where Kirschner wires need to be inserted and exited are marked. Then, the telescopic positioning frame is adjusted so that the end of the insertion positioning mechanism facing the exit limiting mechanism coincides with the proximal marking point on the patella, and the end of the exit limiting mechanism facing the insertion positioning mechanism coincides with the distal marking point on the patella. The length of the telescopic positioning frame is adjusted to position the patella within the clamping state of the insertion positioning and exit limiting mechanisms. Simultaneously, the positioning cylinder is rotated, both to continue moving towards the patella, further increasing clamping stability, and to offset the second through slot on the positioning cylinder from the first through slot on the first cylinder shell. After the entire device is assembled, the Kirschner wire is inserted into the first needle channel from the positioning cylinder, passing through the proximal end of the patella. Under the limiting effect of the first needle channel, the Kirschner wire maintains a straight insertion during insertion, ensuring its exit from the distal marker point of the patella. Once the Kirschner wire exits from the distal marker point, it enters the second needle channel within the exit limiting mechanism. The second needle channel limits the distal exit section of the Kirschner wire, improving its stability and preventing bending during puncture, which could affect the puncture effect. Simultaneously, the reduced number of insertions effectively decreases the frequency of C-arm use, reducing radiation exposure for patients and medical staff. After the puncture is completed, the positioning cylinder is rotated to move it away from the patella, reducing the clamping effect of the insertion positioning mechanism and the exit limiting mechanism on the patella. At the same time, the first and second through slots are connected and completely overlapped, so that the Kirschner wire in the first needle path can be withdrawn from the connected first and second through slots. At the same time, the Kirschner wire exiting from the distal end of the patella can be withdrawn from the third through slot of the exit limiting mechanism. This allows the entire Kirschner wire positioning device to be quickly separated from the Kirschner wire after use, avoiding cumbersome disassembly that could affect the subsequent surgical process. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model.
[0016] Figure 2 for Figure 1 A frontal view of the structure.
[0017] Figure 3 for Figure 1 A side view structural diagram.
[0018] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of AA.
[0019] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of BB.
[0020] Among them, 100-insertion positioning mechanism, 110-first cylindrical shell, 120-positioning cylinder, 130-first needle path, 140-first through groove, 150-second through groove, 160-elastic positioning tube, 170-exit through groove, 180-external thread, 190-first conical cylinder, 1100-first sawtooth, 1110-turntable, 200-insertion limiting mechanism, 210-second needle path, 220-third through groove, 230-second cylindrical shell, 240-second conical cylinder, 250-second sawtooth, 300-telescopic positioning frame, 310-first L plate, 320-second L plate, 330-insertion groove, 340-slide plate, 360-threaded rod, 370-compression nut. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.
[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0023] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.
[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] Please refer to Figures 1 to 5 As shown, a Kirschner wire positioning device includes an insertion positioning mechanism 100 located at the proximal end and an exit limiting mechanism 200 located at the distal end. The insertion positioning mechanism 100 and the exit limiting mechanism 200 are connected by a telescopic positioning frame 300. The insertion positioning mechanism 100 includes a first cylindrical shell 110 connected to the telescopic positioning frame 300. The first cylindrical shell 110 has a positioning cylinder 120 threaded through both ends and coaxially threaded. The positioning cylinder 120 has a first needle channel 130 coaxially constructed inside. The side wall of the first cylindrical shell 110 has a first through groove 140 communicating with its inner cavity along its axis. The side wall of the positioning cylinder 120 has a second through groove 150 communicating with the first needle channel 130 along its axis. The insertion limiting mechanism 200 has a through second needle channel 210, and the side wall of the insertion limiting mechanism 200 has a third through groove 220 that communicates with the second needle channel 210.
[0028] In this way, during the surgery, the patient's patella is first scanned using a C-arm, and the positions where the Kirschner wire needs to be inserted and exited are marked. Then, by adjusting the telescopic positioning frame 300, the end of the insertion positioning mechanism 100 facing the exit limiting mechanism 200 is aligned with the proximal marking point of the patella, and the end of the exit limiting mechanism 200 facing the insertion positioning mechanism 100 is aligned with the distal marking point of the patella. The length of the telescopic positioning frame 300 is adjusted so that the patella is clamped by the insertion positioning mechanism 100 and the exit limiting mechanism 200. At the same time, the positioning cylinder 120 is rotated, which on the one hand, allows the positioning cylinder 120 to continue moving towards the patella, further increasing the clamping stability, and on the other hand, sets the second through groove 150 on the positioning cylinder 120 to be offset from the first through groove 140 on the first cylinder shell 110. After the entire device is assembled, the Kirschner wire is inserted into the first needle path 130 from the positioning cylinder 120. It is then inserted along the first needle path 130 from the proximal end of the patella. Under the limiting effect of the first needle path 130, the Kirschner wire maintains a straight insertion during insertion, ensuring it exits from the distal marker point of the patella. After the Kirschner wire exits from the distal marker point of the patella, it enters the second needle path 210 within the exit limiting mechanism 200. The second needle path 210 limits the distal exit section of the Kirschner wire, improving its exit stability and preventing bending during puncture, which would affect the puncture effect. After the puncture is completed, by rotating the positioning cylinder 120, on the one hand, the positioning cylinder 120 is moved away from the patella, reducing the clamping effect of the insertion positioning mechanism 100 and the exit limiting mechanism 200 on the patella. On the other hand, the first through groove 140 and the second through groove 150 are connected and completely overlapped. In this way, the Kirschner wire located in the first needle channel 130 can be withdrawn from the connected first through groove 140 and second through groove 150. At the same time, the Kirschner wire exiting section located at the distal end of the patella can be withdrawn from the third through groove 220 of the exit limiting mechanism 200. Thus, after the entire Kirschner wire positioning device is used, it can be quickly separated from the Kirschner wire, avoiding the cumbersome disassembly that would affect the subsequent surgical process.
[0029] Furthermore, in order to facilitate the normal passage of the Kirschner wire through the first through slot 140, the second channel, and the third channel, the width of the first through slot 140, the second through slot 150, and the third through slot 220 is the same as the outer diameter of the Kirschner wire.
[0030] Furthermore, in order to ensure proper positioning of the Kirschner wire within the first needle track 130 and prevent it from moving back and forth in the second through groove 150 after entering the first needle track 130, thus affecting its normal insertion, an elastic positioning tube 160 is fitted to the arc-shaped walls of the first needle track 130 and the second through groove 150. The elastic positioning tube 160 is coaxially arranged with the second needle track 210, while the first needle track 130 and the elastic positioning tube 160 are off-axis. Specifically, the axis of the first needle track 130 is off-axis with the elastic positioning tube 160. The axes of the positioning tube 160 are parallel, and the axis of the first needle channel 130 is closer to the second through groove 150 than the axis of the elastic positioning tube 160. The elastic positioning tube 160 has an exit through groove 170 along its axis on the side facing the second through groove 150. The inner diameter of the elastic positioning tube 160 is the same as the inner diameter of the Kirschner wire. The width of the exit through groove 170 is smaller than the outer diameter of the Kirschner wire. The tube walls of the elastic positioning tube 160 on both sides of the exit through groove 170 are separated from the inner wall of the first needle channel 130.
[0031] In this way, the Kirschner wire can be inserted into the elastic positioning tube 160 through the exit groove 170, thereby making the Kirschner wire stably fixed in the first needle channel 130, and can move along the axial direction of the elastic positioning tube 160 without affecting the normal insertion of the Kirschner wire.
[0032] Furthermore, the outer wall of the positioning cylinder 120 is provided with an external thread 180, which is intermittently provided at the position of the second through groove 150, and the inner wall of the first cylinder shell 110 is provided with an internal thread, which is intermittently provided at the position of the first through groove 140.
[0033] In order to better position the positioning cylinder 120 against the skin at the patella and prevent the positioning cylinder 120 from shaking unexpectedly during the insertion of the Kirschner wire, a first conical cylinder 190 is coaxially constructed at the end of the positioning cylinder 120 facing the insertion limiting mechanism 200. The conical end of the first conical cylinder 190 is disposed away from the positioning cylinder 120, and a plurality of first serrations 1100 are constructed around its axis on the conical end face of the first conical cylinder 190.
[0034] In this way, by using the first saw tooth 1100 to contact the patient's skin, the relative displacement between the entire positioning cylinder 120 and the patient's skin is limited.
[0035] Furthermore, a turntable 1110 is coaxially mounted on the outer wall of the end of the positioning cylinder 120 away from the through-limiting mechanism 200, and the turntable 1110 is disconnected at the position of the second through groove 150.
[0036] The rotation of turntable 1110 facilitates medical staff to rotate positioning cylinder 120, thereby adjusting the position of positioning cylinder 120.
[0037] Furthermore, similar to the aforementioned description, in order to ensure closer contact between the insertion limiting mechanism 200 and the skin at the distal end of the patient's patella, and to prevent accidental relative movement between the insertion limiting mechanism 200 and the patient's skin, the insertion limiting mechanism 200 includes a second cylindrical shell 230 connected to the telescopic positioning frame 300. The end of the second cylindrical shell 230 facing the first cylindrical shell 110 is coaxially constructed with a second conical cylinder 240. The second needle channel 210 coaxially passes through the second cylindrical shell 230 and the second conical cylinder 240. The third through groove 220 is provided through the sidewalls of the second cylindrical shell 230 and the second conical cylinder 240.
[0038] Furthermore, the second conical cylinder 240 has a plurality of second serrations 250 around its axis on the end face facing the first cylindrical shell 110.
[0039] More specifically, for the telescopic positioning frame 300, the telescopic positioning frame 300 includes a first L-plate 310 connected to the top surface of the first cylindrical shell 110 and a second L-plate 320 connected to the top surface of the through-limiting mechanism 200. The horizontal section of the second L-plate 320 is constructed with a horizontally penetrating insertion groove 330. The end of the horizontal section of the first L-plate 310 is equipped with a sliding plate 340 that slides into the insertion groove 330. A threaded rod 360 is constructed on the sliding plate 340. A clamping nut 370 is threadedly installed on the threaded rod 360. The clamping nut 370 abuts against the horizontal section of the second L-plate 320.
[0040] In this way, after loosening the clamping nut 370, the distance between the first L plate 310 and the second L plate 320 can be adjusted, allowing the first L plate 310 and the second L plate 320 to move relative to each other, thereby adjusting the distance between the insertion positioning mechanism 100 and the exit limiting mechanism 200. After the distance adjustment is completed, the clamping nut 370 is locked, so that it is tightly pressed against the second L plate 320, which can fix the first L plate 310 and the second L plate 320 in position, thereby keeping the distance between the insertion positioning mechanism 100 and the exit limiting mechanism 200 stable.
[0041] 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 Kirschner wire positioning device, characterized in that, It includes an insertion positioning mechanism (100) located at the proximal end and an exit limiting mechanism (200) located at the distal end, wherein the insertion positioning mechanism (100) and the exit limiting mechanism (200) are connected by a telescopic positioning frame (300); The insertion positioning mechanism (100) includes a first cylindrical shell (110) connected to the telescopic positioning frame (300). The first cylindrical shell (110) has a positioning cylinder (120) threaded through both ends and coaxially threaded. The positioning cylinder (120) has a first needle channel (130) coaxially constructed inside. The side wall of the first cylindrical shell (110) has a first through groove (140) communicating with its inner cavity along its axis. The side wall of the positioning cylinder (120) has a second through groove (150) communicating with the first needle channel (130) along its axis. The insertion limiting mechanism (200) has a through second needle channel (210), and the side wall of the insertion limiting mechanism (200) has a third through groove (220) that communicates with the second needle channel (210).
2. The Kirschner wire positioning device according to claim 1, characterized in that, The widths of the first through groove (140), the second through groove (150), and the third through groove (220) are the same as the outer diameter of the Kirschner wire.
3. The Kirschner wire positioning device according to claim 1, characterized in that, An elastic positioning tube (160) is fitted to the arc-shaped wall opposite to the first needle channel (130) and the second through groove (150). The elastic positioning tube (160) is coaxially arranged with the second needle channel (210). The first needle channel (130) and the elastic positioning tube (160) are off-axis arranged. An exit through groove (170) is constructed along the axis of the side of the elastic positioning tube (160) facing the second through groove (150). The inner diameter of the elastic positioning tube (160) is the same as the inner diameter of the Kirschner wire. The width of the exit through groove (170) is smaller than the outer diameter of the Kirschner wire. The tube walls of the elastic positioning tube (160) on both sides of the exit through groove (170) are separated from the inner wall of the first needle channel (130).
4. The Kirschner wire positioning device according to claim 1, characterized in that, The outer wall of the positioning cylinder (120) is provided with an external thread (180), which is intermittently provided at the position of the second through groove (150). The inner wall of the first cylinder shell (110) is provided with an internal thread, which is intermittently provided at the position of the first through groove (140).
5. The Kirschner wire positioning device according to claim 1, characterized in that, The positioning cylinder (120) has a first conical cylinder (190) coaxially arranged at one end facing the through-limiting mechanism (200). The conical end of the first conical cylinder (190) is disposed away from the positioning cylinder (120), and the conical end face of the first conical cylinder (190) is constructed with a plurality of first serrations (1100) around its axis.
6. The Kirschner wire positioning device according to claim 1, characterized in that, A turntable (1110) is coaxially mounted on the outer wall of the end of the positioning cylinder (120) away from the through-limiting mechanism (200), and the turntable (1110) is disconnected at the position of the second through groove (150).
7. The Kirschner wire positioning device according to claim 1, characterized in that, The insertion limiting mechanism (200) includes a second cylindrical shell (230) connected to the telescopic positioning frame (300). The second cylindrical shell (230) has a second conical cylinder (240) coaxially constructed at one end facing the first cylindrical shell (110). The second needle channel (210) coaxially passes through the second cylindrical shell (230) and the second conical cylinder (240). The third through groove (220) is provided through the side wall of the second cylindrical shell (230) and the second conical cylinder (240).
8. A Kirschner wire positioning device according to claim 7, characterized in that, The end face of the second conical cylinder (240) facing the first cylindrical shell (110) is constructed with a plurality of second serrations (250) around its axis.
9. A Kirschner wire positioning device according to claim 1, characterized in that, The telescopic positioning frame (300) includes a first L-plate (310) connected to the top surface of the first cylindrical shell (110) and a second L-plate (320) connected to the top surface of the through-limiting mechanism (200). The horizontal section of the second L-plate (320) is constructed with a horizontally penetrating insertion groove (330). The end of the horizontal section of the first L-plate (310) is equipped with a sliding plate (340) that slides into the insertion groove (330). A threaded rod (360) is constructed on the sliding plate (340). A clamping nut (370) is threaded on the threaded rod (360). The clamping nut (370) abuts against the horizontal section of the second L-plate (320).