Flexible traction device for pelvic fracture reduction

Abstract

The invention discloses a flexible traction device for pelvic fracture reduction. The flexible traction device comprises a translation unit, a lifting unit, a rotation unit, a traction rope winding and unwinding unit, a traction rope, a tensioning unit, a traction force monitoring unit and a bone nail clamping unit. By means of specific arrangement of the units and cooperative arrangement of the units, the problems that traditional manual traction operation is unstable, traction force is insufficient and the like are solved, damage to soft tissue is reduced, the risk of postoperative complications is reduced, stable and accurate support is provided for large traction force needed by pelvic fracture reduction, and the operation efficiency is improved. And the traction effect and the stability of the traction device are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, in particular to a flexible traction device for pelvic fracture reduction. Background Art

[0002] Pelvic fractures are a significant increase in modern society due to causes such as falls from height, traffic accidents, and stress fractures. Their incidence accounts for 3% to 8% of all fractures, and their disability and mortality rates are as high as 37% and 30% to 60%, respectively. Traditional open reduction surgery is associated with large incisions and long recovery times. Improper treatment can lead to deformity and functional impairment of the affected limb, placing a heavy burden on the patient's family and society.

[0003] After a displaced pelvic fracture, the force required for reduction is often very high due to factors such as soft tissue incarceration and locking of the fracture ends, reaching 396N to 500N or even higher along the long axis of the operating table. Compared to manual reduction, a traction device offers advantages such as smoother operation, higher precision, less intraoperative fluoroscopy, and reduced workload for the surgeon, providing greater accuracy and safety.

[0004] With increasing attention to the aforementioned technical issues, scholars at research institutes, hospitals, and universities both domestically and internationally have conducted extensive research on pelvic fracture reduction techniques in recent years, primarily focusing on improvements in surgical tools and reduction methods. Chinese invention patent publication CN 111317554A discloses a pelvic reduction traction device that, by providing multiple rotating blocks and connecting devices, enables intraoperative fixation of relevant pelvic components. However, this technical solution offers relatively small traction displacement, failing to meet broader needs. Currently, there is still a lack of a simple, user-friendly, stable, and adaptable solution for complex pelvic structures. As the core component for transmitting load during pelvic fracture reduction, improper design of the traction device can easily lead to reduction failure or secondary injury to the patient. Traditional traction methods, such as manual traction, suffer from shortcomings such as insufficient traction force, imprecise operation, and significant soft tissue damage, making them difficult to meet the reduction requirements of complex pelvic fractures. Existing rigid traction devices, while capable of providing significant traction force, are bulky, lack flexibility, and impose numerous restrictions on patient positioning, hindering widespread clinical application.

[0005] Therefore, there is an urgent need for a flexible device specifically for pelvic fracture reduction that meets the mechanical and precision requirements of pelvic fracture reduction and can achieve stable traction of pelvic fracture fragments in combination with clinical needs. Summary of the Invention

[0006] The purpose of the present invention is to provide a flexible traction device for pelvic fracture reduction to solve the above problems.

[0007] In order to solve the problems of insufficient traction force, imprecise operation, excessive occupation of surgical space resources, and damage to blood supply to the affected limb in the traction devices in the prior art, the present application provides a flexible traction device for pelvic fracture reduction.

[0008] This is specifically achieved through the following technical solutions:

[0009] A flexible traction device for pelvic fracture reduction comprises a translation unit, a lifting unit, a rotation unit, a traction rope retracting unit, a traction rope, a tensioning unit, a traction force monitoring unit and a bone screw clamping unit.

[0010] The translation unit is slidably connected to one end of the operating table and is used to drive the entire flexible traction device to move in the horizontal direction.

[0011] The lifting unit is connected to the translation unit and is used to drive the rotation unit, the tensioning unit, the traction force monitoring unit and the bone screw clamping unit to move in the vertical direction.

[0012] The rotary unit is connected to the upper part of the lifting unit and is used to realize the rotation of the tensioning unit.

[0013] The traction rope retracting and releasing unit is used for retracting and releasing the traction rope.

[0014] The traction rope includes a first traction rope and a second traction rope. The two ends of the first traction rope are respectively connected to the traction rope retracting unit and the traction force monitoring unit and are partially placed on the tensioning unit. The two ends of the second traction rope are respectively connected to the traction force monitoring unit and the bone screw clamping unit.

[0015] The tensioning unit is used to perform real-time tensioning operations on the traction rope.

[0016] The traction force monitoring unit is used to monitor and display the traction force of the traction rope in real time.

[0017] One end of the bone screw clamping unit is connected to the traction rope, and the other end clamps the bone screw located at the end of the femur and realizes the traction action on it through the traction rope.

[0018] Preferably, the tensioning unit includes a sleeve component, a pulley component and a compression spring, and the pulley component includes a pulley.

[0019] Preferably, the traction rope retracting and releasing unit includes a reduction motor assembly, a winding wheel and a second seat bearing.

[0020] Preferably, the traction force monitoring unit comprises a digital traction force measuring device.

[0021] Preferably, the starting end of the first traction rope is fixedly connected to the winding wheel and wound on the winding wheel, the first traction rope is placed on the upper part of the pulley of the tensioning unit, and the end of the first traction rope is fixedly connected to one end of the traction force monitoring unit; the other end of the traction force monitoring unit is fixedly connected to the starting end of the second traction rope, and the end of the second traction rope is fixedly connected to the traction bow of the bone screw clamping unit.

[0022] Preferably, the flexible traction device is fixed to the tail of the operating table, and the translation unit is installed on the slide rail at the tail of the operating table to drive the traction device to move in translation; the lifting unit is installed on the translation unit to drive the traction device to lift and lower perpendicular to the operating table; the rotation unit is fixed above the lifting unit to realize the rotation of the tensioning unit installed above the rotation unit; the traction rope retraction unit is installed on the translation unit for retraction of the traction rope; the traction rope is divided into a first traction rope and a second traction rope, one end of the first traction rope is fixed to the traction rope retraction unit, and the other end is fixed to one side of the digital traction force measuring device, and is tensioned by the tensioning unit; the digital traction force measuring device is located between the fracture traction device and the femur, and monitors the changes in traction force in real time; one end of the second traction rope is fixed to the other side of the digital gravity measuring device, and one end is connected to the bone screw clamping unit; the bone screw clamping unit is used to clamp the bone screw located at the end of the femur.

[0023] Preferably, the translation unit includes a slide rail connector, a support plate, a limit slot plate and a locking component; the bottom of the slide rail connector is slidably connected to the slide rail of the operating table, and a slide slot is provided on the slide rail connector. The support plate is an inverted "U"-shaped structure, and the "U"-shaped structure includes a vertical first end and a second end and a connecting plate connecting the first end and the second end; the first end of the "U"-shaped structure is clamped into the slide slot of the slide rail connector, and the second end of the "U"-shaped structure is in contact with the outer wall of the slide rail connector; the locking component is provided on the second end; the limit slot plate is fixed to the side of the support plate, and a limit slot is provided on the limit slot plate.

[0024] Preferably, the locking component includes a square clamping block, a locking bolt and a double-ball handwheel; the square clamping block is arranged between the second end of the "U"-shaped structure and the slide rail connector, the locking bolt passes through the second end and is connected to the second end by a thread, one end of the locking bolt is rotatably connected to the square clamping block, and the other end is fixedly provided with the double-ball handwheel.

[0025] Preferably, the lifting unit includes a column, a rack, a gear, a transmission component and a handwheel; the column is vertically sleeved in the limiting groove of the limiting groove plate, the rack is vertically fixed to the side of the column, and the gear is engaged with the rack through gear teeth.

[0026] Preferably, the transmission component includes a transmission shaft, a first bearing, a first seat bearing and a worm gear transmission; one end of the transmission shaft is fixedly sleeved on the inner ring of the gear, and the other end is fixedly sleeved on the inner ring of the worm gear of the worm gear transmission; the first bearing is provided on the outer sleeve of the transmission shaft between the gear and the worm gear transmission, and a first seat bearing is provided on the first bearing; the base of the first seat bearing is fixedly connected to the limiting slot plate; the worm input end of the worm gear transmission is connected to the handwheel, and the bottom of the worm gear transmission is fixedly connected to the limiting slot plate (the handwheel installed on the worm gear transmission is manually driven to drive the gear to rotate, and the gear drives the rack to move, driving the column to rise and fall).

[0027] Preferably, the rotary unit includes a second bearing, a rotating shaft, a planar thrust bearing and an end cover, the outer ring of the second bearing is fixedly connected to the top of the column, the bottom end of the rotating shaft is fixedly connected to the inner ring of the second bearing, the rotating shaft passes through the planar thrust bearing and the end cover respectively, and the top end of the rotating shaft protrudes upward from the top of the end cover, the bottom surface of the end cover is tightly pressed above the planar thrust bearing, and the bottom surface of the end cover is fixedly connected to the top of the column (for axial limitation of the rotating shaft).

[0028] Preferably, a blind hole is provided at the top end of the column, and the blind hole is used to receive the bottom end of the rotating shaft.

[0029] Preferably, the sleeve component of the tensioning unit includes a sleeve base, an outer sleeve and a sleeve frame plate, the bottom of the sleeve base is fixedly connected to the top of the rotating shaft, the sleeve frame plate includes a sleeve bottom plate, a limit plate and a slide plate, the slide plate is vertically arranged on the side, and a vertical slide groove is provided on the relative slide plate, the sleeve bottom plate is arranged at the bottom end of the slide plate, and the limit plate is arranged at the top end of the slide plate (for preventing the first traction rope from jumping the groove); the outer sleeve is vertically arranged and the bottom end is fixedly connected to the top end of the sleeve bottom plate (the pulley is installed on the pulley support using the pulley shaft for tensioning the traction rope and buffering the traction force).

[0030] Preferably, the pulley component includes a pulley support, a pulley, a pulley shaft and an inner sleeve; the pulley support is wrapped around the outside of the pulley, the inner sleeve is vertically arranged at the bottom of the pulley support, the inner sleeve is sleeved inside the outer sleeve, the compression spring is sleeved on the outside of the inner sleeve and the outer sleeve, and the top end of the compression spring is abutted against the outer bottom of the pulley support, and the bottom end is abutted against the inner bottom of the sleeve bottom plate; the pulley shaft is horizontally inserted through and fixedly connected to the center of the pulley, the pulley shaft is outwardly inserted and rotatably connected to the side wall of the pulley support, and the two ends of the pulley shaft are respectively placed in the vertical slide grooves on the oppositely arranged slide groove plates.

[0031] Preferably, the traction rope retracting unit is arranged on the translation unit.

[0032] Preferably, the reduction motor assembly and the second seat bearing of the traction rope retraction unit are fixedly arranged below the limiting slot plate, one end of the shaft of the winding wheel is connected to the output shaft of the reduction motor assembly, and the other end of the shaft is fixed to the inner ring of the second seat bearing (the traction rope is wound on the winding wheel, and the reduction motor assembly drives the traction rope to be retracted and released in forward and reverse rotation).

[0033] Preferably, the bone screw clamping unit includes a traction bow, a screw clamp, a first pin, a second pin and a small curved bow; the traction bow is a "U"-shaped structure, which is connected to the end of the second traction rope at the middle connecting plate of the "U"-shaped structure, and is connected to the two ends of the small curved bow through two or more second pins at both ends of the "U"-shaped structure. The small curved bow can rotate with the second pin as the axis and clamp the bone screw between the small curved bow and the two ends of the "U"-shaped structure. The two ends of the "U"-shaped structure are also connected to two or more sets of screw clamps through two or more first pins. The screw clamp can rotate with the first pin as the axis and clamp the outside of the small curved bow.

[0034] The beneficial technical effects of the present invention are:

[0035] 1. For specific operations such as pelvic fractures, the present invention provides a first traction rope and a second traction rope, and coordinates the specific configuration of the traction force monitoring unit and the tensioning unit to achieve the effect of rationally setting the traction force for specific individual situations under the premise of flexible traction. The device of the present invention solves the problems of unstable operation and insufficient traction force of traditional manual traction. The specific flexible traction mechanism reduces damage to soft tissue and reduces the risk of postoperative complications. It provides stable and precise support for the high traction force required for pelvic fracture reduction (up to 500N or more), thereby greatly improving the traction effect and stability of the traction device.

[0036] 2. The present invention reasonably arranges a tensioning unit cooperating with the first traction rope on the basis of setting the first traction rope, the second traction rope and the traction force monitoring unit that are specifically connected and arranged. By setting the tensioning unit at a specific position of the first traction rope between the traction rope retracting unit and the traction force monitoring unit, the tensioning and buffering traction force of the first traction rope at any time are achieved through the cooperation of the compression spring and the pulley (through the specific arrangement of the sleeve component and the pulley component), thereby enhancing the technical effect of flexible traction and further improving the stability under the premise of providing large traction force.

[0037] 3. The present invention provides a slewing unit and cooperates the slewing unit with the tensioning unit. When the position needs to be adjusted during operation, the direction of the tensioning unit can be adjusted in real time to the direction of pelvic operation under the condition that the slewing unit is rotatable. The slewing unit is a passive smooth steering, which greatly improves the fine adjustment of the working position while keeping the specific traction force unchanged, thereby avoiding the problem of damage to the relevant parts of the pelvis or traction failure due to the change of traction force at a certain moment.

[0038] 4. Based on the arrangement of various flexible traction components, specifically through the provision of a translation unit, a lifting unit, a rotation unit, and a traction rope retraction unit, the present invention allows the entire device to be installed directly at the end of the operating table, greatly saving surgical space resources. The present invention overcomes the shortcomings of traditional mechanical traction devices, such as bulk, poor flexibility, and many restrictions on patient positioning. Through the specific coordination and arrangement of the aforementioned units, the present invention achieves technical benefits such as compact structure, stable traction force, high reduction accuracy, and simple operation. Furthermore, by providing a specific bone screw clamping unit that cooperates with the traction rope, the versatility of the entire device is enhanced. The modular design and easy assembly and disassembly connection ensure the flexibility and adaptability of the device, facilitate disinfection and transportation, provide higher efficiency and convenience for implementation, further shorten the overall operation time, reduce the number of fluoroscopy times, and reduce the difficulty of operation. Furthermore, the specific bone screw clamping unit, which can be connected to the second traction rope, adopts an open design, does not block the fracture site, and leaves sufficient space for taking anteroposterior and portal radiographs during surgery, providing a better field of view and operating conditions during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is an axial schematic diagram of a flexible traction device for pelvic fracture reduction according to an embodiment of the present invention.

[0040] Figure 2 It is a structural schematic diagram of a translation unit according to an embodiment of the present invention.

[0041] Figure 3 This is a structural schematic diagram of a lifting unit according to an embodiment of the present invention.

[0042] Figure 4 for Figure 3 Schematic diagram of the internal explosion structure at point A in the middle.

[0043] Figure 5 This is a schematic structural diagram of a rotary unit according to an embodiment of the present invention.

[0044] Figure 6 for Figure 5 Schematic diagram of the internal explosion structure at point B.

[0045] Figure 7This is a schematic structural diagram of a tensioning unit according to an embodiment of the present invention.

[0046] Figure 8 This is a schematic structural diagram of a traction rope retracting and releasing unit according to one embodiment of the present invention.

[0047] Figure 9 This is a schematic structural diagram of a bone screw clamping unit according to one embodiment of the present invention.

[0048] Figure 10 for Figure 9 Schematic diagram of the structure with a partial enlargement at point C in the middle.

[0049] Among them: 1- translation unit; 2- lifting unit; 3- rotation unit; 4- tensioning unit; 5- traction rope retracting and releasing unit; 6- traction rope; 7- digital traction force measuring device; 8- bone screw clamping unit; 9- operating table; 10- slide rail; 11- first traction rope; 12- second traction rope; 13- bone screw; 14- support plate; 141- first end; 142- second end; 143- connecting plate; 144- limiting slot plate; 145- limiting slot; 15- slide rail connector; 151- slide slot; 16- square clamping block; 17- locking bolt; 18- double ball handwheel; 19- column; 191- blind hole; 20- rack; 21- gear; 22- first Bearing; 23-drive shaft; 24-first seat bearing; 25-worm gear transmission; 251-worm input end; 26-handwheel; 27-second bearing; 28-rotating shaft; 29-plane thrust bearing; 30-end cover; 31-sleeve base; 311-outer sleeve; 312-sleeve bottom plate; 32-pulley support; 321-inner sleeve; 33-compression spring; 34-pulley; 35-pulley shaft; 36-limiting plate; 37-slide plate; 371-vertical slide; 38-reduction motor assembly; 39-winding wheel; 40 second seat bearing; 41-traction bow; 42-screw clamp; 43-first pin shaft; 44-second pin shaft; 45-small curved bow. DETAILED DESCRIPTION

[0050] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0051] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of the present application herein.

[0052] In this application, when the terms "comprise" and "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and or combinations thereof. In this specification and claims, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", "far", "near" and the like indicate directions or positional relationships based on the directions shown in the drawings or the actual positional relationships in use. They are only relative terms determined for the convenience of describing the structural relationships of the various components or elements of the present disclosure. They do not specifically refer to any component or element in the present disclosure and cannot be understood as limitations on the present disclosure. They also limit the position and direction relationships during transportation and other uses. In this specification and claims, terms such as "fixed", "connected", "connected", "provided with", "equipped with" and the like should be understood in a broad sense, indicating that they can be fixedly connected, integrally connected or detachably connected; they can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in this disclosure according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0053] Example 1

[0054] This embodiment provides a flexible traction device for pelvic fracture reduction, such as Figures 1 to 7 As shown, the device includes a translation unit 1, a lifting unit 2, a rotation unit 3, a tensioning unit 4, a traction rope retracting unit 5, a traction rope 6, a digital traction force measuring device 7 and a bone screw clamping unit 8.

[0055] like Figure 1 As shown, the flexible traction device is fixed to the tail of the operating table 9, and the translation unit 1 is installed on the slide rail 10 at the tail of the operating table 9, for driving the traction device to translate; the lifting unit 2 is installed on the translation unit 1, for driving the traction device to lift and lower perpendicular to the operating table 9; the rotation unit 3 is fixed above the lifting unit 2, for realizing the rotation of the tensioning unit 4 installed above the rotation unit 3; the traction rope retraction unit 5 is installed on the translation unit 1, for retracting and releasing the traction rope 6; the traction rope 6 is divided into a first traction rope 11 and a second traction rope 12, one end of the first traction rope 11 is fixed to the traction rope retraction unit 5, and the other end is fixed to one side of the digital traction force measuring device 7, and is tensioned by the tensioning unit 4; the digital traction force measuring device 7 is located between the fracture traction device and the femur, and monitors the changes in traction force in real time; one end of the second traction rope 12 is fixed to the other side of the digital gravity measuring device 7, and one end is connected to the bone screw clamping unit 8; the bone screw clamping unit 8 is used to clamp the bone screw 13 located at the end of the femur.

[0056] like Figure 1 and Figure 2 As shown, Figure 2The center right portion is an enlarged view of the locking components. The translation unit 1 comprises a support plate 14, a slide rail connector 15, a square clamping block 16, a locking bolt 17, and a double-ball handwheel 18. The support plate 14 is secured to the slide rail connector 15 and used to mount the lifting unit 2. The slide rail connector 15 is mounted on the slide rail 10 and drives the traction device for translation. The locking bolt 17, with the square clamping block 16 attached to one end and the double-ball handwheel 18 attached to the other end, is threadedly connected to the support plate 14 and secures the translation unit 1.

[0057] like Figure 1 and Figure 3 、 Figure 4 As shown, the lifting unit 2 includes a column 19, a rack 20, a gear 21, a first bearing 22, a transmission shaft 23, a first bearing seat 24, a worm gear driver 25, and a handwheel 26. The column 19 is installed in the limit groove of the support plate 15, and the rack 20 is fixed to the side of the column 19 and meshes with the gear 21; the gear 21 and the worm gear driver 25 are connected through the transmission shaft 23, and the transmission shaft 23 is installed on the support plate 15 through the first bearing 22 and the first bearing seat 24; the handwheel 26 installed on the worm gear driver 25 is driven to drive the gear 21 to rotate, and the gear drives the rack 20 to move, driving the column 19 to rise and fall.

[0058] like Figure 1 and Figure 5 、 Figure 6 As shown, the rotary unit 3 includes a second bearing 27, a rotating shaft 28, a planar thrust bearing 29, and an end cover 30. The second bearing 27 is fixed to the top of the column 19. One end of the rotating shaft 28 is fixed to the inner ring of the second bearing 27, and the other end is equipped with the planar thrust bearing 29; the end cover 30 is tightly pressed above the planar thrust bearing 29 and fixed to the column 29 by bolts to limit the axial position of the rotating shaft 28.

[0059] like Figure 1 and Figure 7 As shown, the tensioning unit 4 includes a sleeve base 31, a pulley support 32, a compression spring 33, a pulley 34, a pulley shaft 35, a limit plate 36, and a slide plate 37. The sleeve base 31 is fixed to the top of the rotating shaft 28 by bolts, and the pulley support 32 is installed in the sleeve base 31. The compression spring 33 is sleeved on the outside of the sleeve base 31 and the pulley support 32. The pulley 34 is installed on the pulley support 32 using the pulley shaft 35 to tension the traction rope 11 and buffer the traction force; the slide plate 37 is installed on both sides of the sleeve base 31, and the pulley shaft 35 is tangent to the vertical slide groove 371 for axial limitation of the pulley 34; the limit plate 36 is installed on the top of the slide groove plate 37 to prevent the traction rope 11 from jumping.

[0060] like Figure 1 and Figure 8 As shown, the traction rope retraction unit includes a reduction motor assembly 38, a winding wheel 39, and a second seat bearing 40. The reduction motor assembly 38 and the second seat bearing 40 are fixed under the support plate 14 and fixed to the two ends of the winding wheel 39. The traction rope 11 is wound on the winding wheel 39, and the reduction motor assembly 38 drives the traction rope 11 to be retracted and released in forward and reverse directions.

[0061] like Figure 1 and Figure 9 、 Figure 10 As shown, the bone screw clamping unit 8 includes a traction bow 41, a screw clamp 42, a first pin 43, a second pin 44, and a small curved bow 45. The traction bow 41 is fixed to the end of the second traction rope 12, and the screw clamp 42 and the small curved bow 45 are installed at the end of the traction bow 41 through the first pin 43 and the second pin 44 for fixing the bone screw 13.

[0062] The working process of this embodiment is:

[0063] Before the operation, the patient's affected bone is scanned by CT to obtain image information of the patient's broken bone. The image is segmented in a computer, and the scanned CT data is used to build a 3D model on the PC using analysis software. After the patient is anesthetized for clinical surgery, the patient is placed supine on a suitable position on the operating table 9. One end of the second traction rope 12 is fixed to the other side of the digital traction force measuring device 7, and the other end is connected to the bone screw clamping unit 8. The small bow 45 in the bone screw clamping unit 8 clamps the bone screw 13 by rotating on the second pin shaft, and then the small bow 45 is clamped from the opening of the small bow 45 into the screw clamp 42 by rotating the screw clamp 42, thereby achieving efficient bone nailing of the bone screw 13. Then, by retracting and releasing the traction bow 41 and the traction rope 6, the femur is tractioned to help reduce the pelvic fracture.

[0064] The specific implementation steps are as follows: First, secure the device and perform preliminary adjustments. Secure the flexible traction device to the slide rail 10 at the rear of the operating table 9. Use the slide rail connector 15 and locking bolt 17 in the translation unit 1 to adjust the device's position on the slide rail 10, ensuring alignment with the affected femur. Use the double-ball handwheel 18 to lock the translation unit 1 to prevent movement during surgery. Subsequently, adjust the device's height using the lifting unit 2, depending on surgical requirements. Turning the handwheel 18 causes the worm gear 25 to rotate the gear 21, which engages with the rack 20, causing the column 19 to rise and fall within the retaining groove of the support plate 14 until the desired height is reached. Simultaneously, the angle of the tensioning unit 4 is adjusted using the slewing unit 3. Driven by the second bearing 27 and the planar thrust bearing 29, the rotating shaft 28 drives the tensioning unit 4 to rotate, ensuring that the direction of the traction rope 11 aligns with the femoral traction direction. Next, the pulley 34 in the tensioning unit 4, driven by the compression spring 33, buffers the traction force and maintains the tension of the traction rope 11. During surgery, a digital traction force meter 7, located between the fracture traction device and the femur, monitors changes in traction force in real time. Based on the display of the digital traction force meter 7, the reduction motor assembly 38 in the traction rope retraction unit 5 is adjusted to control the forward and reverse rotation of the winding wheel 39, thereby precisely controlling the retraction and extension of the traction rope 11 and ensuring that the traction force remains within a safe range. Finally, after the operation is completed, the traction force is gradually released, the bone screw clamping unit 8 is removed, and the traction rope 6 is retracted to its initial position. The translation unit 1 is unlocked, and the device is removed from the slide rail 10, completing the entire traction process.

[0065] Comparative Example 1

[0066] The other configurations of this comparative example are identical to those of Example 1, except that no tensioning unit is provided, and the steering is performed directly via the fixed pulley. Comparative testing using a model simulating the pelvis revealed that the traction force displayed on the digital traction force meter changed very rapidly during initial installation (lack of force buffering). Furthermore, when the model was moved slightly faster during operation, the bone screws became slightly misaligned (instantaneous excessive traction force), and upon further movement, the traction rope dropped (instantaneous traction force release). This demonstrates that the coordination of the tensioning unit, the first and second traction ropes, and the digital traction force meter of the present invention achieves the coordinated effect of constantly maintaining flexible tension on the pelvis.

[0067] Comparative Example 2

[0068] The other configurations of this comparative example are identical to those of Example 1, except that the slewing unit is not provided, and the tensioning unit is directly connected to the lifting unit. The other configurations are identical to those of Example 1. A comparative test using a model simulating a pelvis revealed that when the model is moved during operation, the traction force displayed on the digital traction force measuring device increases, demonstrating that the orientation of the tensioning unit and the traction rope are at a certain angle, resulting in an increase in traction force. Adjustment of the traction rope retracting and releasing unit is necessary, but this adjustment process wastes time and increases the traction force instability period (adjusting the traction force), thereby affecting the normal operation process and causing traction instability. This demonstrates that the coordinated coordination of the slewing unit and the tensioning unit in the present invention achieves the effect of maintaining flexible and stable traction force in real time, demonstrating the coordinated effect of the two.

[0069] Comparative Example 3

[0070] The other settings of this comparative example are the same as those of Example 1, except that no second traction rope is provided, and the other end of the digital traction force measuring device is directly connected to the bone screw clamping unit. The other settings are exactly the same as those of Example 1. A comparative test was conducted using a model simulating a pelvis, and it was found that the digital traction force measuring device blocked the line of sight between the operator and the pelvic model for nearly 50% of the time, requiring the operator to adjust the positions of various components to achieve unobstructed vision. This not only interrupted the operation process, but also may lead to adverse consequences such as misjudgment of the operation effect, thereby proving that the coordinated cooperation between the various components of the present invention is the optimal setting.

[0071] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A flexible traction device for pelvic fracture reduction, characterized in that: It includes a translation unit, a lifting unit, a rotation unit, a traction rope retracting unit, a traction rope, a tensioning unit, a traction force monitoring unit and a bone screw clamping unit; The translation unit is slidably connected to one end of the operating table and is used to drive the flexible traction device as a whole to move horizontally; The lifting unit is connected to the translation unit and is used to drive the rotation unit, the tensioning unit, the traction force monitoring unit and the bone screw clamping unit to move in the vertical direction; The rotary unit is connected to the upper part of the lifting unit and is used to realize the rotation of the tensioning unit; The traction rope retracting and releasing unit is used for retracting and releasing the traction rope; The traction rope includes a first traction rope and a second traction rope, wherein both ends of the first traction rope are respectively connected to the traction rope retracting unit and the traction force monitoring unit and are partially laid on the tensioning unit, and both ends of the second traction rope are respectively connected to the traction force monitoring unit and the bone screw clamping unit; The tensioning unit is used to perform real-time tensioning operation on the traction rope; The traction force monitoring unit is used to monitor and display the traction force of the traction rope in real time; One end of the bone screw clamping unit is connected to the second traction rope, and the other end clamps the bone screw located at the end of the femur and realizes the traction action on it through the second traction rope.

2. The flexible traction device for pelvic fracture reduction according to claim 1, characterized in that: The tensioning unit includes a sleeve component, a pulley component and a compression spring, and the pulley component includes a pulley; The traction rope retracting and releasing unit includes a reduction motor assembly, a winding wheel and a second seat bearing; The traction force monitoring unit includes a digital traction force measuring device.

3. The flexible traction device for pelvic fracture reduction according to claim 2, characterized in that: The starting end of the first traction rope is fixedly connected to the winding wheel and wound on the winding wheel, the first traction rope is placed on the upper part of the pulley of the tensioning unit, and the end of the first traction rope is fixedly connected to one end of the traction force monitoring unit; the other end of the traction force monitoring unit is fixedly connected to the starting end of the second traction rope, and the end of the second traction rope is fixedly connected to the traction bow of the bone screw clamping unit.

4. The flexible traction device for pelvic fracture reduction according to claim 1 or 3, characterized in that: The translation unit includes a slide rail connector, a support plate, a limit slot plate and a locking component; the bottom of the slide rail connector is slidably connected to the slide rail of the operating table, and a slide slot is provided on the slide rail connector. The support plate is an inverted "U"-shaped structure, and the "U"-shaped structure includes a vertical first end and a second end and a connecting plate connecting the first end and the second end; the first end of the "U"-shaped structure is clamped into the slide slot of the slide rail connector, and the second end of the "U"-shaped structure is in contact with the outer wall of the slide rail connector; the locking component is provided on the second end; the limit slot plate is fixedly connected to the side of the support plate, and a limit slot is provided on the limit slot plate; The locking component includes a square clamping block, a locking bolt and a double-ball handwheel; the square clamping block is arranged between the second end of the "U"-shaped structure and the slide rail connector, the locking bolt passes through the second end and is connected to the second end through a thread, one end of the locking bolt is rotatably connected to the square clamping block, and the other end is fixedly provided with the double-ball handwheel.

5. The flexible traction device for pelvic fracture reduction according to claim 4, characterized in that: The lifting unit includes a column, a rack, a gear, a transmission component and a handwheel; the column is vertically sleeved in the limiting groove of the limiting groove plate, the rack is vertically fixed to the side of the column, and the gear is meshed with the rack through gear teeth; The transmission component includes a transmission shaft, a first bearing, a first seat bearing and a worm gear transmission; one end of the transmission shaft is fixedly sleeved on the inner ring of the gear, and the other end is fixedly sleeved on the inner ring of the worm gear of the worm gear transmission; the first bearing is provided on the outer sleeve of the transmission shaft between the gear and the worm gear transmission, and a first seat bearing is provided on the first bearing; the base of the first seat bearing is fixedly connected to the limiting slot plate; the worm input end of the worm gear transmission is connected to the handwheel, and the bottom of the worm gear transmission is fixedly connected to the limiting slot plate.

6. The flexible traction device for pelvic fracture reduction according to claim 5, characterized in that: The rotary unit includes a second bearing, a rotating shaft, a plane thrust bearing and an end cover. The outer ring of the second bearing is fixedly connected to the top of the column, and the bottom end of the rotating shaft is fixedly connected to the inner ring of the second bearing. The rotating shaft passes through the plane thrust bearing and the end cover respectively, and the top end of the rotating shaft protrudes upward from the top of the end cover. The bottom surface of the end cover is tightly pressed above the plane thrust bearing, and the bottom surface of the end cover is fixedly connected to the top of the column.

7. The flexible traction device for pelvic fracture reduction according to claim 6, characterized in that: A blind hole is provided at the top end of the column, and the blind hole is used to receive the bottom end of the rotating shaft.

8. The flexible traction device for pelvic fracture reduction according to claim 6 or 7, characterized in that: The sleeve component of the tensioning unit includes a sleeve base, an outer sleeve and a sleeve frame plate, the bottom of the sleeve base is fixedly connected to the top end of the rotating shaft, the sleeve frame plate includes a sleeve bottom plate, a limit plate and a slide plate, the slide plate is vertically arranged on the side, a vertical slide groove is vertically penetrated on the opposite slide plate, the sleeve bottom plate is arranged at the bottom end of the slide plate, and the limit plate is arranged at the top end of the slide plate; the outer sleeve is vertically arranged and the bottom end is fixedly connected to the top end of the sleeve bottom plate; The pulley component includes a pulley support, a pulley, a pulley shaft and an inner sleeve; the pulley support is wrapped around the outside of the pulley, the inner sleeve is vertically arranged at the bottom of the pulley support, the inner sleeve is sleeved inside the outer sleeve, the compression spring is sleeved on the outside of the inner sleeve and the outer sleeve, and the top end of the compression spring is against the outer bottom of the pulley support, and the bottom end is against the inner bottom of the sleeve bottom plate; the pulley shaft is horizontally inserted through and fixedly connected to the center of the pulley, the pulley shaft is outwardly inserted and rotatably connected to the side wall of the pulley support, and the two ends of the pulley shaft are respectively placed in the vertical slide grooves on the oppositely arranged slide groove plates.

9. The flexible traction device for pelvic fracture reduction according to claim 8, characterized in that: The traction rope retracting unit is arranged on the translation unit; The reduction motor assembly and the second seat bearing of the traction rope retracting unit are fixedly arranged below the limiting slot plate, one end of the shaft of the winding wheel is connected to the output shaft of the reduction motor assembly, and the other end of the shaft is fixed to the inner ring of the second seat bearing.

10. The flexible traction device for pelvic fracture reduction according to claim 1 or 9, characterized in that: The bone screw clamping unit includes a traction bow, a screw clamp, a first pin, a second pin and a small curved bow; the traction bow is a "U"-shaped structure, which is connected to the end of the second traction rope at the middle connecting plate of the "U"-shaped structure, and is connected to the two ends of the small curved bow through two or more second pins at both ends of the "U"-shaped structure. The small curved bow can rotate with the second pin as the axis and clamp the bone screw between the small curved bow and the two ends of the "U"-shaped structure. The two ends of the "U"-shaped structure are also connected to two or more sets of screw clamps through two or more first pins. The screw clamp can rotate with the first pin as the axis and clamp the outside of the small curved bow.

Images