A convenient high-rigidity healthy side pelvis fixing device

Abstract

The application discloses a convenient high-rigidity healthy-side pelvis fixing device, which comprises a support assembly and a support chain device. The three-fold hole position plates of the support assembly are specifically arranged, and the overall arrangement of the components of the support chain device is matched, so that the device has the characteristics of high structural rigidity, quick and convenient operation, strong adaptability, high flexibility, good compatibility and the like.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a convenient and highly rigid fixation device for the healthy side of the pelvis. Background Technology

[0002] Pelvic fractures are very serious bone injuries, usually caused by high-energy violence such as falls from heights and traffic accidents. Pelvic fractures are often complex, anatomically divided into the healthy pelvis (the side without a fracture) and the affected pelvis (the side with the fracture). Because the pelvis is surrounded by abundant soft tissues such as muscles, the forces generated by soft tissue deformation after a fracture affect the shape and stability of the fractured hemipelvis. During closed reduction of pelvic fractures, the affected pelvis is often connected to the output end of the reduction device or reduction robot, while the healthy pelvis is usually fixed to the operating table using a healthy fixation device. However, existing healthy pelvic fixation devices generally suffer from insufficient overall rigidity, poor flexibility, inconvenient adjustment, and even interference with fluoroscopy and the surgeon's intraoperative manipulation. These shortcomings not only make the surgeon's operation inconvenient and reduce surgical efficiency but also affect the fixation effect of the healthy pelvis, thus affecting the reduction accuracy, increasing the patient's recovery period and medical risks.

[0003] Chinese invention patent announcement CN115634033B discloses a fracture reduction mechanism for minimally invasive surgery of pelvic fractures. It discloses a healthy side fixation component, which supports the healthy side of the pelvis through the setting of components such as support sliders and support vertical shafts. However, this technical solution focuses on the portability of the overall reduction mechanism, which ensures operability, but the rigidity, stability and coordination of the mechanism need to be improved.

[0004] Therefore, there is an urgent need for a high-rigidity and easy-to-operate contralateral pelvic fixation device. This device should meet the following key requirements: high rigidity to ensure the stability of the contralateral pelvis fixation; adjustability to adapt to different patients' anatomical structures and screw placement positions; ease of operation, with a design that allows for quick and simple installation and removal by surgeons, reducing surgical time and patient discomfort; and stability, ensuring the fixation mechanism provides sufficient stability to prevent displacement of the contralateral pelvis during reduction, thus providing a reliable fulcrum for the reduction of the fractured hemipelvis. Such a design will help improve reduction accuracy, optimize the surgical procedure, and ultimately improve patient treatment outcomes and rehabilitation experience. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a convenient and high-rigidity fixation device for the healthy side pelvis.

[0006] A convenient and high-rigidity fixation device for the healthy side of the pelvis, comprising a support assembly and a support chain device.

[0007] The support assembly is used to fix the support assembly to the side of the operating table and to fix multiple branch devices. The support assembly includes a support unit for fixing the support assembly to the side of the operating table and a three-fold hole plate for fixing multiple branch devices. The three-fold hole plate includes a first side plate, a middle plate and a second side plate, which are perpendicular to the bed board of the operating table and connected to each other. The middle plate is located between the first side plate and the second side plate, and the included angle between the first side plate and the middle plate is α, and the included angle between the second side plate and the middle plate is β, satisfying 25°<α<38° and 25°<β<38°. The first side plate, the middle plate and the second side plate are provided with multiple frustum-shaped through holes. The diameter of the through holes facing the inside of the operating table (i.e., the inside of the three-fold hole plate) is larger than the diameter of the side away from the operating table (i.e., the outside of the three-fold hole plate). The through holes on the first side plate and the second side plate are arranged in an elliptical shape, and the through holes on the middle plate are arranged in a circular shape with multiple centers coinciding.

[0008] The branch device includes a branch locking assembly, a telescopic adjustment assembly, a rotation adjustment assembly, and an anti-dropping assembly.

[0009] One end of the branch locking assembly is connected to the telescopic adjustment assembly, and the other end extends into the through holes of the first side plate, the middle plate, and the second side plate, respectively, for connecting the branch device to the three-fold hole plate.

[0010] The other end of the telescopic adjustment component is connected to the rotation adjustment component, and is used to adjust the length of the branch chain device.

[0011] The other end of the rotation adjustment component is connected to the anti-drop component and is used to adjust the angle between the end of the branch device and the holding screw.

[0012] The other end of the anti-dislodgement component is connected to the holding screw, which is used to clamp the holding screw and connect it to the healthy side of the pelvis.

[0013] Preferably, three sets of the branch chain device are provided, respectively disposed on the first side plate, the middle plate, and the second side plate.

[0014] Preferably, the through holes on the first side plate and the second side plate are arranged in an elliptical shape, and the diameter of the ellipse in the vertical direction is larger than the diameter in the horizontal direction.

[0015] Preferably, the through holes on the first side plate and the second side plate are arranged in an elliptical shape, and the ratio between the diameter of the ellipse in the vertical direction and the diameter in the horizontal direction is (1.8~4.5):(0.9~1.1).

[0016] Preferably, α and β are equal or unequal, and the first side plate and the second side plate are closer to the operating table board relative to the middle plate (i.e., both the first side plate and the second side plate are folded inward rather than outward relative to the middle plate).

[0017] Preferably, the support unit of the bracket assembly includes at least two locking screws, at least two locking handles, at least two clamping blocks, at least one U-shaped support, and at least two support blocks. The U-shaped support is a horizontally placed "U" shape, including an upper horizontal plate, a lower horizontal plate, and a connecting vertical plate. The opening of the "U" shape can be inserted into the operating table board through the side of the operating table. The upper horizontal plate above the operating table is vertically provided with the three-fold hole plate. The support block is also provided between one or both sides of the three-fold hole plate and the upper horizontal plate. The support block is used to strengthen the connection between the three-fold hole plate and the upper horizontal plate and prevent the connection angle between the two from changing. The locking screw is provided with external threads and passes through the lower horizontal plate through an internal threaded through hole. The top of the locking screw is rotatably connected to the clamping plate provided between the lower horizontal plate and the operating table board. The bottom of the locking screw is provided with the locking handle.

[0018] Preferably, each of the branch locking components includes at least one ball joint, at least one conical seat, and at least one anti-loosening nut; the outer surface of the middle section of the conical seat matches the inner surface size and shape of the through hole of the frustum structure, and the conical seat penetrates the through hole of the frustum structure; the larger diameter end of the conical seat is located on the inner side of the three-fold hole plate and has a spherical hole inside, which is used to accommodate the ball joint (providing three rotational degrees of freedom for the branch unit, and as a passive pair, it can move slightly when subjected to impact to reduce the impact damage to the healthy pelvis); the smaller diameter end of the conical seat is located on the outer side of the three-fold hole plate and the anti-loosening nut is screwed on the outside.

[0019] Preferably, each telescopic adjustment assembly includes at least one ball joint connector, at least one telescopic cylinder, at least one spring collet, at least one locking nut, and at least one telescopic rod; one end of the ball joint connector is connected to the ball joint of the branch locking assembly, and the other end is connected to the telescopic cylinder; the telescopic cylinder is hollow inside to receive the telescopic rod, an elastic collet is provided between the telescopic cylinder and the telescopic rod, and the locking nut is sleeved on the outside of the elastic collet and the telescopic rod; the beginning end of the telescopic rod can pass through the locking nut and the spring collet and extend into the telescopic cylinder; the locking nut tightens with the telescopic cylinder to tightly abut the elastic collet against the telescopic rod, thereby fixing the relative displacement of the telescopic rod and the telescopic cylinder (the telescopic rod can change its extension length according to the position of the holding screw, in conjunction with the telescopic cylinder, to adjust the length of the branch unit).

[0020] Preferably, the telescopic rod includes a rod-shaped part and a toothed part. The rod-shaped part is located at the beginning of the telescopic rod, and the toothed part is located at the end of the telescopic rod. The rod-shaped part is connected to the outer circumference of the toothed part. A tooth is provided on the edge of one bottom surface of the toothed part, and a central hole is provided at the center of the toothed part.

[0021] Preferably, each of the rotation adjustment components includes at least one needle nut, at least one needle clamp, at least one end gear plate, and at least one slotted bolt; the needle nut cooperates with the needle clamp to clamp the holding screw (by inserting the holding screw into the needle clamp and tightening the needle nut to lock the holding screw, the holding screw being connected to the bone being worked on via threads); the end gear plate is fixed to the side of the needle clamp via its back, and teeth are provided at the surface edge of the end gear plate, the teeth of the end gear plate being able to mesh with the teeth of the column teeth (for adjusting the angle between the end of the branch unit and the holding screw, and locking the rotation of the end of the branch unit by meshing the teeth on the surface of the end gear plate with the teeth of the column teeth of the telescopic rod), a through hole is provided at the axis of the end gear plate, and a circumferential groove is provided near the tail end of the slotted bolt, the slotted bolt being able to pass through the axis hole and the through hole and abut against the side of the needle clamp.

[0022] Preferably, each of the anti-drop components includes at least one compression spring and at least one anti-drop rod; the anti-drop rod includes a rod cap end, a long rod portion, and a stepped shaft end, with both ends of the long rod portion connected to the rod cap end and the stepped shaft end, respectively; grooves are provided on the back of the end gear plate and the side of the needle clamp, and after the end gear plate and the needle clamp are fixed together, the opposing grooves form an anti-drop rod receiving groove that can accommodate the anti-drop rod, the diameter of the outer edge of the anti-drop rod receiving groove is smaller than the diameter of the center portion, and the anti-drop rod receiving groove and the end gear plate... The through holes are perpendicular to each other; the compression spring is sleeved on the outside of the anti-loosening rod and is housed together with the anti-loosening rod in the anti-loosening rod receiving groove. The bottom of the compression spring abuts against the upper surface of the axial step end of the anti-loosening rod, and the lower surface of the outer edge of the anti-loosening rod receiving groove of the compression spring abuts against the lower surface of the outer edge of the anti-loosening rod receiving groove. The outer diameter of the axial step end of the anti-loosening rod is less than or equal to the width of the circumferential groove of the slotted bolt (the compression spring and the anti-loosening rod form a self-locking mechanism to prevent the slotted bolt from falling off and to ensure the locking effect of the rotary adjustment component).

[0023] The beneficial technical effects of this invention are as follows:

[0024] 1. This invention is specifically designed for a fixation device for the healthy pelvis. Adapted to the specific structure, position, and conditions of the healthy pelvis, it utilizes a three-fold hole plate with a unique three-fold structure. The angles between the three folds and the arrangement of the through holes allow for the selection of appropriate hole positions to install the support chain device. The first and second side plates are angled relative to the middle plate, causing the outer two folds to fold inwards, bringing the support chain device closer to the holding screw and shortening its length. This increases the overall structural rigidity of the device, facilitating easier connection between the support chain device and the corresponding holding screw. The support chain device extending from three angles allows for more convenient and efficient connection to the healthy pelvis, ensuring that the telescopic adjustment components of multiple support chain devices can be adjusted relatively minimally to achieve fixation of the pelvis in three dimensions. Furthermore, it enhances the rigidity of the fixation device for the healthy pelvis. Compared with existing pelvic fixation devices for the healthy side, this device solves the problems of low rigidity, poor adaptability, and inconvenient operation of existing devices. This invention features high overall structural rigidity, quick and convenient operation, strong adaptability, high flexibility, and good compatibility.

[0025] 2. This invention, by setting through holes with a frustum structure on the three-fold hole plate, allows the support device to be more securely fixed to the support assembly. Since the support device needs to rotate frequently, the through holes and the components that mate with them are prone to wear. If other through holes were used, wear would lead to a loose fit. However, by setting through holes with a frustum structure that is larger on the inside and smaller on the outside, even with minor wear, simply tightening the anti-loosening nut will maintain a highly stable connection. Combined with the support assembly specifically designed in this invention, the overall high-rigidity installation on the side of the operating table ensures the stability of the device and prevents displacement of the healthy pelvis during repositioning. The device exhibits good overall stability and high structural rigidity.

[0026] 3. This invention, by integrating the branch devices that cooperate with specific support components, makes the device easy to operate and highly adaptable as a whole. The support components allow for a wide range of movement, improving the overall adaptability of the device. Each branch device employs ball joints, telescopic adjustment components, and rotary adjustment components, providing a wide range of spatial positions for the holding screw clamp to accommodate different types of pelvic fractures in patients. The ball joints provide a wide range of rotation angles for each branch; the telescopic adjustment components allow for quick adjustment of the branch length and locking; the rotary adjustment components allow for quick adjustment of the connection between the pin clamp and the holding screw and locking. The design of the ball joints and adjustment components improves the ease of operation, allowing users to quickly and easily install and disassemble the device, reducing operation time and patient discomfort.

[0027] By employing specific support components in conjunction with multiple sets of branch chain devices, the device achieves high flexibility. Even with only one or two branches locked, the pelvis remains mobile, allowing the user to adjust the position of the healthy pelvis within a small range based on the placement of the first two pins, thus improving surgical efficiency. When all three branches are locked, the device's overall degrees of freedom are zero, achieving complete fixation of the healthy pelvis. The device also boasts high compatibility. The relatively flexible design of its components significantly enhances its versatility, enabling it to be used in conjunction with other surgical instruments and equipment, facilitating combined use during procedures. Attached Figure Description

[0028] Figure 1 This is an isometric schematic diagram of a convenient and high-rigidity fixation device for the healthy side pelvis according to the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of a support assembly according to one embodiment.

[0030] Figure 3 This is a schematic diagram of the structure of a branch locking component according to one embodiment.

[0031] Figure 4 for Figure 3 A partial cross-sectional view of the junction at point A.

[0032] Figure 5 This is a schematic diagram of the combination and explosion of the telescopic adjustment assembly in one embodiment.

[0033] Figure 6 This is a schematic diagram of the structure of a rotary adjustment assembly according to one embodiment.

[0034] Figure 7 This is an exploded structural diagram of a rotary adjustment assembly according to one embodiment.

[0035] Figure 8 This is a cross-sectional structural diagram of an anti-detachment component according to one embodiment.

[0036] Among them: 1-bracket assembly, 2-branch locking assembly, 3-telescopic adjustment assembly, 4-rotation adjustment assembly, 5-anti-drop assembly, 6-holding screw, 7-operating table board;

[0037] 8-Locking screw, 9-Locking handle, 10-Clamping block, 11-U-shaped support, 111-Upper horizontal plate, 112-Lower horizontal plate, 113-Connecting vertical plate; 12-Support block, 13-Three-fold hole plate; 131-First side plate; 132-Middle plate; 133-Second side plate; 134-Through hole;

[0038] 14-Spherical hinge, 15-Conical seat, 16-Anti-loosening nut;

[0039] 17-Spherical hinge connector, 18-Telescopic cylinder, 19-Spring collet, 20-Locking nut, 21-Telescopic rod, 211-Rod-shaped part, 212-Pinky tooth part;

[0040] 22-Pin nut, 23-Pin clamp, 24-End toothed disc, 25-Slotted bolt, 251-Circumferential groove;

[0041] 26-Anti-drop rod, 261-Rod cap end, 262-Long rod section, 263-Shaft step end, 264-Anti-drop rod receiving groove, 27-Compression spring. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Any equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are within the scope of protection of the present invention.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0044] In this application, 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. In this specification and claims, terms such as "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "side," "bottom," "far," and "near," indicating orientation or positional relationships, are based on the orientation shown in the drawings or actual usage positional relationships. They are merely relational terms determined for the convenience of describing the structural relationships of the components or elements of this disclosure and do not specifically refer to any component or element in this disclosure. They should not be construed as limitations on this disclosure, nor as limitations on positional and orientational relationships during transportation and other uses. In this specification and claims, terms such as "fixed," "connected," "linked," "equipped with," "enclosed," and "configured," should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this disclosure can be determined according to the specific circumstances and should not be construed as limitations on this disclosure.

[0045] Example 1

[0046] This embodiment provides a retractable, multi-degree-of-freedom contralateral pelvic fixation device, such as... Figures 1 to 7As shown, the device includes a support assembly 1 and a chain device, the chain device including a chain locking assembly 2, a telescopic adjustment assembly 3, a rotation adjustment assembly 4, and an anti-fall-off assembly 5.

[0047] like Figure 1 As shown, the healthy pelvic fixation device is installed on the side of the operating table 7. The entire device moves using the support assembly 1, which also serves to install the branch chain device, move along the side of the operating table 7, and raise and lower perpendicular to the top surface of the operating table 7. The healthy pelvic fixation device has three branch chain devices. Before locking, each branch chain device has multiple degrees of freedom; after locking, multiple branch chain devices mutually constrain each other, forming a rigid structure with the healthy pelvis, firmly fixing the healthy pelvis to the operating table 7. The branch chain locking assembly 2 is fixed to the support assembly and is used to install the telescopic adjustment assembly 3, providing three rotational degrees of freedom to the end of the branch chain device. The telescopic adjustment assembly 3 is fixed to the branch chain locking assembly 2, providing telescopic functionality to the branch chain device. The rotation adjustment assembly 4 is installed at the left end of the telescopic adjustment assembly 2 and is used to adjust the angle between the end of the branch chain device and the holding screw 6. All components of the branch chain device work together to adjust the position of the end of the branch chain device for quick and stable clamping of the holding screw 6.

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, the support assembly 1 includes a locking screw 8, a locking handle 9, a clamping block 10, a U-shaped support 11, a support block 12, and a three-fold hole plate 13. The locking screw 8, by rotating the locking handle 9, causes the clamping block 10 to press against the bottom surface of the operating table 7; the U-shaped support 11 presses against the top and sides of the operating table 7, working in conjunction with the clamping block 10 to ensure the stability of the healthy pelvic fixation device; the support block 12 enhances the strength and stability of the three-fold hole plate 13; the three sides of the three-fold hole plate 13 are machined with tapered holes (i.e., through holes of a frustum structure), such as... Figure 1 and Figure 2 As shown, the tapered holes on both sides are distributed in an elliptical pattern, and the vertical diameter of the ellipse is 3.75 times the horizontal diameter. The tapered holes on the middle surface are distributed in a circular pattern, used to install the support device and provide movement along the side of the operating table 7 and lifting perpendicular to the top surface of the operating table 7. The included angle between the first side plate and the middle plate of the three-fold hole plate 13, as well as the included angle between the middle plate and the second side plate, are both inwardly folded at 30°, which can reduce the length of the support device, thereby reducing the lever arm and improving the rigidity of the support device.

[0049] like Figure 1 , Figure 3 and Figure 4As shown, the branch locking assembly 2 includes a ball joint 14, a conical seat 15, and a lock nut 16. The ball joint 14 is installed in the conical seat 15, providing three rotational degrees of freedom for the branch device. As a passive pair, it can move slightly under impact to reduce damage to the healthy pelvis. The conical seat 15 is used for mounting the branch device to the three-fold hole plate 13. The conical surface of the conical seat 15 can fit tightly with the conical hole surface of the three-fold hole plate 13 to ensure the stability of the branch device. The lock nut 16 is used to fix the branch locking assembly 2.

[0050] like Figure 1 and Figure 5 As shown, the telescopic adjustment assembly 3 includes a ball joint connector 17, a telescopic cylinder 18, a spring clamp 19, a locking nut 20, and a telescopic rod 21. The ball joint connector 17 is mounted on the ball joint 14 and is used to mount the telescopic cylinder 18; the telescopic cylinder 18 is mounted on the ball joint connector 17 and provides telescopic space for the telescopic rod 21; the spring clamp 19 cooperates with the locking nut 20 to lock the telescopic rod 21; the telescopic rod 21 can change its extension length according to the position of the holding screw and in conjunction with the telescopic cylinder 18 to adjust the length of the branch chain device.

[0051] like Figure 1 and Figure 6 , Figure 7 As shown, the rotation adjustment assembly 4 includes a needle nut 22, a needle clamp 23, an end gear plate 24, and a slotted bolt 25. The needle nut 22 cooperates with the needle clamp 23 to clamp the holding screw 6; the end gear plate 24 is mounted on the surface of the needle clamp 23 and cooperates with the slotted bolt 25 and the telescopic rod 21 to adjust the angle between the end of the branch device and the holding screw 6, and the locking of the rotation of the end of the branch device is completed by the meshing of the teeth on the surface of the end gear plate 24 and the teeth on the surface of the telescopic rod 21.

[0052] like Figure 1 and Figure 8 As shown, the anti-drop component 5 includes a compression spring 26 and an anti-drop rod 27. The compression spring 26 and the anti-drop rod 27 form a self-locking mechanism, which is installed between the end gear plate 24 and the needle clamp 23 to prevent the slotted bolt 25 from falling off and to ensure the locking effect of the rotary adjustment component 4.

[0053] The specific implementation steps of this embodiment are as follows: First, according to the actual position requirements, the support assembly 1 is installed on the side of the operating table board 7. By rotating the locking handle 9 in conjunction with the locking screw 8, the clamping block 10 is pressed against the bottom surface of the operating table board 7, thereby fixing the support assembly 1 to the operating table board 7 and ensuring the stability of the healthy pelvic fixation device. Then, the support device, which is composed of the support locking assembly 2, the telescopic adjustment assembly 3, the rotation adjustment assembly 4, and the anti-drop assembly 5, is assembled. Appropriate holes are selected on the three-fold hole plate 13. The conical seat 15 in the support locking assembly 2 is inserted into the through holes of the frustum structure on the first side plate, the middle plate, and the second side plate, respectively. The anti-loosening nut 16 is tightened to complete the fixation of the support. Then, the needle clamp 23 in the rotation adjustment assembly 4 is assembled with the holding screw 6. The position of the needle clamp 23 in the holding screw 6 and the position of the telescopic rod 21 in the telescopic cylinder 18 are adjusted. First, rotate the end gear plate 24 to ensure that the teeth of the end gear plate 24 mesh with the teeth of the telescopic rod 21. Then, screw in the slotted bolt 25. The anti-drop rod 26 in the anti-drop assembly 5 is first lifted up. After the slotted bolt 25 is tightened, the bottom of the anti-drop rod 26 enters the slot of the slotted bolt 25, completing the self-locking (locking angle position) of the rotation adjustment assembly. Next, tighten the pin nut 22 in the rotation adjustment assembly 4 (locking and holding screw 6 position) and the locking nut 20 in the telescopic adjustment assembly 3 (locking length position) to complete the locking of the single branch device. Finally, repeat the locking steps of the first branch device on the second branch device to complete the locking of the second branch device. Fine-tune the final position of the healthy pelvis and the branch device, and then repeat the locking steps of the first branch device to complete the locking of the third branch device, thus completing the fixation of the healthy pelvis.

[0054] Through the specific design of this embodiment, the following advantages are achieved: 1) Excellent structural stability: The overall rigidity of the device is significantly improved by the inward folding design on both sides of the three-fold hole plate and the layout of the branch device as needed; 2) Convenient and efficient operation: The various adjustment components work together to quickly adjust the position of the end of the branch device, so as to quickly and stably clamp the holding screw; 3) Strong adaptability: The length and angle of the branch can be flexibly adjusted to meet the fixation needs of different patients' healthy pelvis; 4) Flexible use: It supports step-by-step locking. After locking one or two branches, the position of the pelvis can still be adjusted, which is convenient for adjusting the position of the pelvis according to the actual situation during the operation; 5) Good compatibility: It can be used in conjunction with conventional surgical instruments to improve surgical efficiency.

[0055] Comparative Example 1

[0056] The other settings in this comparative example are the same as in Example 1, except that a straight plate is used instead of a three-fold hole plate. After the support chain device is snapped and screwed onto the conical hole on the straight plate, a comparative operation is performed using a simulated pelvis. It is found that the elongation of the support chain device at the edge is more than twice that of the middle support chain device. Furthermore, after locking, the simulated pelvis is moved forcefully, and the straight plate is found to slide slightly. This proves that the specific three-fold plate set in this invention can accurately match the pelvis, significantly reducing the length difference between the three support chain devices and improving the rigidity of the fixation.

[0057] Comparative Example 2

[0058] The other settings in this comparative example are the same as in Example 1, except that the included angle between the first side plate and the middle plate, and between the second side plate and the middle plate, of the three-fold hole plate is set to 60°. After the support chain device is snapped and screwed onto the conical holes on each plate, a comparative operation is performed using a simulated pelvis. It is found that the three support chain devices have relatively small degrees of freedom of rotation. When fixing the simulated pelvis holding screw, it takes almost twice as long to fix them to the holding screw and achieve pelvis fixation. This proves that the specific three-fold plate set in this invention can accurately match the pelvis, and the specific angle setting improves the degree of freedom and thus improves work efficiency.

[0059] Comparative Example 3

[0060] The other settings in this comparative example are the same as in Embodiment 1, except that the arrangement of the conical holes on the first and second side plates is not elliptical, but rather a circular arrangement with multiple centers coinciding with the middle plate. Other settings are the same as in Embodiment 1. A comparative operation using a simulated pelvis revealed that to maintain the stability of the three support devices and ensure their lengths are not significantly different, with α and β both set to 30°, the installation positions on the first and second side plates generally need to be maintained at the outer circular position at the top and the middle circular position on the side. Positions at other locations result in relatively longer lengths for the support devices on the sides, affecting rigidity. Furthermore, the excessive number of through holes in the first and second side plates reduces the overall rigidity of the three-fold hole plate, thus affecting the durability and stability of the overall device. This demonstrates that when the angle between the first and second side plates and the middle plate is set in this invention, an elliptical arrangement of the conical holes on the first and second side plates is the optimal setting to ensure rigidity and stability, and the two arrangements also have a close coordinated effect.

[0061] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Technical effects that are not compared can be explained by textual description. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

[0062] 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 implemented 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 exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A convenient and high-rigidity fixation device for the healthy side of the pelvis, characterized in that, Includes support components and branching devices; The support assembly is used to fix the support assembly to the side of the operating table and to fix multiple branch devices. The support assembly includes a support unit for fixing the support assembly to the side of the operating table and a three-fold hole plate for fixing multiple branch devices. The three-fold hole plate includes a first side plate, a middle plate and a second side plate, which are perpendicular to the bed board of the operating table and are connected to each other in sequence. The included angle between the first side plate and the middle plate is α and the included angle between the second side plate and the middle plate is β, satisfying 25°<α<38° and 25°<β<38°. The first side plate, the middle plate and the second side plate are provided with multiple frustum-shaped through holes. The diameter of the through holes facing the operating table is larger than the diameter of the side away from the operating table. The through holes on the first side plate and the second side plate are arranged in an elliptical shape, and the through holes on the middle plate are arranged in a circular shape with multiple concentric circles. The branch chain device includes a branch chain locking assembly, a telescopic adjustment assembly, a rotation adjustment assembly, and an anti-drop-off assembly; One end of the branch locking assembly is connected to the telescopic adjustment assembly, and the other end extends into the through holes of the first side plate, the middle plate and the second side plate respectively, for connecting the branch device to the three-fold hole plate. The other end of the telescopic adjustment component is connected to the rotary adjustment component, and is used to adjust the length of the branch chain device; The other end of the rotary adjustment component is connected to the anti-drop component and is used to adjust the angle between the end of the branch device and the holding screw. The other end of the anti-dislodgement component is connected to the holding screw, which is used to clamp the holding screw and connect it to the healthy side of the pelvis.

2. The convenient and high-rigidity contralateral pelvic fixation device according to claim 1, characterized in that, The branching device is provided in three sets, which are respectively installed on the first side plate, the middle plate, and the second side plate.

3. The convenient and high-rigidity contralateral pelvic fixation device according to claim 1 or 2, characterized in that, The through holes on the first and second side plates are arranged in an elliptical shape, and the diameter of the ellipse in the vertical direction is larger than its diameter in the horizontal direction.

4. The convenient and high-rigidity contralateral pelvic fixation device according to claim 1 or 2, characterized in that, α and β may be equal or unequal, and the first and second side plates are closer to the operating table board than the middle plate; The through holes on the first and second side plates are arranged in an elliptical shape, and the ratio between the diameter of the ellipse in the vertical direction and the diameter in the horizontal direction is (1.8~4.5):(0.9~1.1).

5. The convenient and high-rigidity contralateral pelvic fixation device according to claim 1 or 2, characterized in that, The support unit of the bracket assembly includes a locking screw, a locking handle, a clamping block, a U-shaped support, and a support block. The U-shaped support is a horizontal "U" shape, including an upper horizontal plate, a lower horizontal plate, and a connecting vertical plate. The opening of the "U" shape can be inserted into the operating table board through the side of the operating table. The upper horizontal plate above the operating table is vertically provided with the three-fold hole plate. The support block is also provided between one or both sides of the three-fold hole plate and the upper horizontal plate. The support block is used to strengthen the connection between the three-fold hole plate and the upper horizontal plate and prevent the connection angle between the two from changing. The locking screw is provided with external threads and passes through the lower horizontal plate through an internal threaded through hole. The top of the locking screw is rotatably connected to the clamping plate provided between the lower horizontal plate and the operating table board. The bottom of the locking screw is provided with the locking handle.

6. The convenient and high-rigidity contralateral pelvic fixation device according to claim 5, characterized in that, The chain locking assembly includes a ball joint, a conical seat, and a lock nut. The outer surface of the middle section of the conical seat matches the inner surface size and shape of the through hole of the frustum structure, and the conical seat penetrates the through hole of the frustum structure. The larger diameter end of the conical seat is located on the inner side of the three-fold hole plate and has a spherical hole inside, which is used to accommodate the ball joint. The smaller diameter end of the conical seat is located on the outer side of the three-fold hole plate and the lock nut is screwed on the outside.

7. The convenient and high-rigidity contralateral pelvic fixation device according to claim 1 or 6, characterized in that, The telescopic adjustment assembly includes a ball joint connector, a telescopic cylinder, a spring collet, a locking nut, and a telescopic rod. One end of the ball joint connector is connected to the ball joint of the branch chain locking assembly, and the other end is connected to the telescopic cylinder. The telescopic cylinder is hollow inside to receive the telescopic rod. An elastic collet is provided between the telescopic cylinder and the telescopic rod. The locking nut is sleeved on the outside of the elastic collet and the telescopic rod. The beginning end of the telescopic rod can pass through the locking nut and the spring collet and extend into the telescopic cylinder. The locking nut tightens with the telescopic cylinder to tightly abut the elastic collet against the telescopic rod, thereby fixing the relative displacement of the telescopic rod and the telescopic cylinder.

8. The convenient and high-rigidity contralateral pelvic fixation device according to claim 7, characterized in that, The telescopic rod includes a rod-shaped part and a toothed part. The rod-shaped part is located at the beginning of the telescopic rod, and the toothed part is located at the end of the telescopic rod. The outer circumference of the rod-shaped part and the toothed part are connected. A tooth is provided on the edge of one bottom surface of the toothed part, and a central hole is provided at the axis of the toothed part.

9. The convenient and high-rigidity contralateral pelvic fixation device according to claim 8, characterized in that, The rotary adjustment assembly includes a needle nut, a needle clamp, an end gear plate, and a slotted bolt. The needle nut cooperates with the needle clamp to clamp the holding screw. The end gear plate is fixed to the side of the needle clamp via its back. Teeth are provided at the edge of the end gear plate, and the teeth of the end gear plate can mesh with the teeth of the column teeth. A through hole is provided at the center of the end gear plate. The slotted bolt has a circumferential groove near its tail end. The slotted bolt can pass through the center hole and the through hole and abut against the side of the needle clamp.

10. The convenient and high-rigidity contralateral pelvic fixation device according to claim 9, characterized in that, The anti-dropping component includes a compression spring and an anti-dropping rod. The anti-dropping rod includes a rod cap end, a long rod portion, and a stepped shaft end, with both ends of the long rod portion connected to the rod cap end and the stepped shaft end, respectively. Grooves are provided on the back of the end gear plate and the side of the needle clamp. After the end gear plate and the needle clamp are fixed together, the corresponding grooves form an anti-dropping rod receiving groove that can accommodate the anti-dropping rod. The diameter of the outer edge of the anti-dropping rod receiving groove is smaller than the diameter of the center portion, and the anti-dropping rod receiving groove is perpendicular to the through hole of the end gear plate. The compression spring is sleeved on the outside of the anti-dropping rod and is housed together with the anti-dropping rod in the anti-dropping rod receiving groove. The bottom of the compression spring abuts against the upper surface of the stepped shaft end of the anti-dropping rod, and the lower surface of the outer edge of the anti-dropping rod receiving groove of the compression spring abuts against it. The outer diameter of the stepped shaft end of the anti-dropping rod is less than or equal to the width of the circumferential groove of the slotted bolt.

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