A three-dimensional fixation brace for pelvic fracture fixation
By designing a three-dimensional fixation brace, the problem of lack of longitudinal restraint in existing pelvic fracture fixation methods is solved. It provides three-dimensional fixation, prevents pelvic internal rotation, promotes fracture healing, and avoids secondary injury.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHANJIANG SECOND HOSPITAL OF TRADITIONAL CHINESE MEDICINE
- Filing Date
- 2025-04-30
- Publication Date
- 2026-07-21
AI Technical Summary
Current methods of pelvic fracture fixation lack longitudinal restraint, which may cause internal rotation of the pelvis, affecting fracture healing and potentially causing secondary injury.
Design a three-dimensional fixation brace, including a first fixation plate and a second fixation plate, which forms a three-dimensional fixation around the patient's pelvis through fixation plates and fixation devices, providing lateral and longitudinal restraint forces to prevent axial torsion.
It achieves three-dimensional fixation of the pelvis, provides effective longitudinal restraint, prevents pelvic internal rotation, promotes fracture healing, and avoids secondary injury.
Smart Images
Figure CN224523368U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically to a three-dimensional fixation brace for fixing pelvic fractures. Background Technology
[0002] In the rehabilitation of patients with pelvic fractures, pelvic fixation is usually required. Currently, the commonly used method is to use fixation straps. However, this method has certain limitations. Due to insufficient binding force between the straps, it can only provide lateral restraint, lacking longitudinal restraint. Furthermore, during the binding process, the straps may induce axial torsion, leading to internal rotation of the pelvis. This not only hinders fracture healing but may also cause secondary injury to the patient. Utility Model Content
[0003] Therefore, this utility model provides a three-dimensional fixation brace for pelvic fracture fixation, which mainly solves the technical problem that existing fixation strap binding methods can only provide lateral restraint force and lack effective longitudinal restraint force during pelvic fixation. In addition, the fixation strap may cause axial torsion during binding, resulting in internal rotation of the pelvis. This internal rotation is not only detrimental to fracture healing, but may also cause secondary injury to the patient.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] A three-dimensional fixation brace for fixing pelvic fractures includes a first fixation plate and a second fixation plate; the first fixation plate has an inverted V-shaped first notch at the center of its bottom; the second fixation plate has an inverted V-shaped second notch at the center of its bottom; the first fixation plate has first fixation pieces on both its left and right sides; the second fixation plate has second fixation pieces on both its left and right sides; a first notch fixation piece is provided along the outer periphery of the first notch; a second notch fixation piece is provided along the outer periphery of the second notch; each of the first and second fixation pieces on both the left and right sides has at least three sets of first fixation devices; the first and second notch fixation pieces have second fixation devices on both the left and right sides; the first and second fixation devices are used to fix the first and second fixation plates together.
[0006] Preferably, the first fixing plate includes an upper lumbar fitting area, a middle buttock fitting area, and a lower left thigh root posterior fitting area and a right thigh root posterior fitting area located on the left and right sides of the first notch; the lumbar fitting area fits the patient's lumbar region; the buttock fitting area fits the patient's buttocks; the left thigh root posterior fitting area fits the patient's left thigh root posterior side; and the right thigh root posterior fitting area fits the patient's right thigh root posterior side.
[0007] Preferably, the second fixing plate includes an upper abdominal fitting area and a lower left thigh root anterior fitting area and a right thigh root anterior fitting area located on the left and right sides of the second notch; the abdominal fitting area fits against the patient's abdomen; the left thigh root anterior fitting area fits against the front of the patient's left thigh root; and the right thigh root anterior fitting area fits against the front of the patient's right thigh root.
[0008] Preferably, the posterior contact area of the left thigh root extends downward to form a first left extension area; the posterior contact area of the right thigh root extends downward to form a first right extension area; the first fixing piece on the left extends downward to the first left extension area; the first fixing piece on the right extends downward to the first right extension area; the left and right sides of the first notched fixing piece extend downward to the first left extension area and the first right extension area, respectively; the anterior contact area of the left thigh root extends downward to form a second left extension area; the anterior contact area of the right thigh root extends downward to form a second right extension area; the left side of the second fixing piece extends downward to the second left extension area; the right side of the second fixing piece extends downward to the second right extension area; the left and right sides of the second notched fixing piece extend downward to the second left extension area and the second right extension area, respectively; the first notched fixing pieces in the first left extension area and the first right extension area, and the second notched fixing pieces in the second left extension area and the second right extension area, are all provided with a third fixing device; the third fixing device is used to fix the first fixing plate and the second fixing plate together.
[0009] Optionally, the first fixing device, the second fixing device, and the third fixing device each include a binding rope and a fixing hole; the fixing hole is formed in the first fixing plate and the corresponding second fixing plate, or the first notched fixing plate and the corresponding second notched fixing plate; the binding rope passes through the fixing hole to bind the first fixing plate and the second fixing plate together.
[0010] Optionally, the first fixing device, the second fixing device, and the third fixing device are all locking devices; the locking device includes a flexible steel rope with one end fixed to the first fixing piece or the first notched fixing piece and a locking sleeve; the locking sleeve includes a fixing sleeve installed on the second fixing piece or the second notched fixing piece; the outer diameter of the flexible steel rope is adapted to the hole diameter of the fixing sleeve; multiple annular locking grooves are evenly distributed on the outer wall of the middle part of the flexible steel rope; a pair of inlay grooves are symmetrically opened on the left and right sides of the bottom of the side wall of the fixing sleeve; locking buttons are hinged to the front and rear side walls of the inlay grooves; the area above the hinge of the locking button is the locking part, and the area below is the pressing part, which has an S-shaped structure; a support piece is provided in the inlay groove outside the locking part; a spring is provided between the support piece and the locking part for pushing the locking part so that its top extends into the locking groove.
[0011] Preferably, the top of the soft steel rope is provided with a spiral anti-slip groove.
[0012] Preferably, the first fixing plate, the second fixing plate, the first left extension area, the first right extension area, the second left extension area, and the second right extension area are all made of flexible non-elastic material.
[0013] Preferably, the first fixing plate, the second fixing plate, the first left extension area, the first right extension area, the second left extension area, and the second right extension area are all provided with multiple through-holes.
[0014] This utility model has at least the following beneficial effects:
[0015] It is equipped with a first fixation plate and a second fixation plate. In use, the first fixation plate covers the patient's buttocks and the second fixation plate covers the patient's abdomen. The first fixation plate and the second fixation plate are fixed together by the first fixation device of the first fixation plate and the second fixation device of the first notch fixation plate and the second notch fixation plate, which limits and fixes the patient's pelvis. This avoids the situation where the fixation strap only has lateral restraint without longitudinal restraint. At the same time, it avoids the secondary injury to the patient caused by axial torsion when the fixation strap is tied. It has the advantage of three-dimensional fixation.
[0016] Therefore, the three-dimensional fixation brace for pelvic fracture fixation of this utility model has the advantages of limiting and fixing the patient's pelvis in the lateral and longitudinal directions, while not causing axial torsion of the pelvis, which is conducive to rehabilitation. Attached Figure Description
[0017] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.
[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0019] Figure 1 This is a left view of a three-dimensional fixation brace for fixing pelvic fractures according to the present invention.
[0020] Figure 2This is a front view of the first fixation plate of a three-dimensional fixation brace for fixing pelvic fractures according to the present invention;
[0021] Figure 3 This is a front view of the second fixation plate of a three-dimensional fixation brace for fixing pelvic fractures according to the present invention;
[0022] Figure 4 This is a schematic diagram of the structure of a three-dimensional fixation brace locking device for pelvic fracture fixation according to the present invention;
[0023] Figure 5 This is a front sectional view of a three-dimensional fixation brace locking device for pelvic fracture fixation according to the present invention.
[0024] Figure 6 This utility model relates to a three-dimensional fixation brace for fixing pelvic fractures. Figure 5 A magnified view of part A;
[0025] Figure 7 This is a schematic diagram of the locking sleeve of a three-dimensional fixation brace locking device for pelvic fracture fixation according to the present invention;
[0026] Figure 8 This is an exploded view of the locking sleeve of a three-dimensional fixation brace locking device for pelvic fracture fixation according to this utility model;
[0027] Figure 9 This is a front sectional view of the engaging sleeve of a three-dimensional fixation brace engaging device for pelvic fracture fixation according to the present invention.
[0028] Figure 10 This is a left view of the three-dimensional fixation brace for pelvic fracture fixation according to the present invention in its usage state;
[0029] Figure 11 This is a front view of the three-dimensional fixation brace for fixing pelvic fractures according to the present invention, in its usage state.
[0030] Explanation of reference numerals in the attached figures:
[0031] 1. First Fixation Plate; 101. Waist Fitting Area; 102. Hip Fitting Area; 103. Left Thigh Groin Back Fitting Area; 104. Right Thigh Groin Back Fitting Area; 105. First Left Extension Area; 106. First Right Extension Area; 107. First Fixation Piece; 108. First Notch; 109. First Notch Fixation Piece; 2. Second Fixation Plate; 201. Abdominal Fitting Area; 202. Left Thigh Groin Front Fitting Area; 203. Right Thigh Groin Front Fitting Area; 204. Second Left Extension Area ; 205, Second right extension area; 206, Second fixing piece; 207, Second notch; 208, Second notch fixing piece; 3, First fixing device; 4, Second fixing device; 5, Third fixing device; 6, Soft steel rope; 601, Slot; 602, Anti-slip groove; 7, Fixing sleeve; 701, Inlay groove; 702, Sleeve mounting platform; 8, Engaging button; 801, Pressing part; 802, Engaging part; 9, Support piece; 10, Spring; 11, Soft steel rope fixing piece; 12, Sleeve fixing piece. Detailed Implementation
[0032] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0033] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).
[0034] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.
[0035] This utility model discloses a three-dimensional fixation brace for fixing pelvic fractures, such as... Figures 1 to 3As shown, a first fixing plate 1 and a second fixing plate 2 are provided. The first fixing plate 1 and the second fixing plate 2 are preferably made of a flexible, non-elastic material, such as polyethylene. The first fixing plate 1 has an inverted V-shaped first notch 108 at the center of its bottom, and the second fixing plate 2 has an inverted V-shaped second notch 207 at the center of its bottom. The first fixing plate 1 has first fixing pieces 107 on both its left and right sides, and the second fixing plate 2 has second fixing pieces 206 on both its left and right sides. A first notch fixing piece 109 is provided along the outer periphery of the first notch 108, and a second notch fixing piece 208 is provided along the outer periphery of the second notch 207. The first fixing pieces 107 and second fixing pieces 206 on both the left and right sides are each provided with at least three sets of first fixing devices 3. In this embodiment, one set of first fixing devices 3 is provided at the top, bottom, and middle. The first notch fixing pieces 109 and second notch fixing pieces 208 are each provided with second fixing devices 4 on both their left and right sides. Thus, in use, as... Figure 10 , Figure 11 As shown, the first fixation plate 1 covers the patient's buttocks, and the second fixation plate 2 covers the patient's abdomen. The first fixation plate 1 and the second fixation plate 2 are fixed together by the first fixation device 3 and the second fixation device 4, thereby limiting and fixing the patient's pelvis. This avoids the situation where the fixation strap only provides lateral restraint without longitudinal restraint, and also avoids secondary injury to the patient caused by axial torsion when the fixation strap is tied.
[0036] Preferably, to better limit and fix the pelvis while improving comfort during use, the first fixation plate 1 includes an upper lumbar fitting area 101, a middle buttock fitting area 102, and lower left thigh root posterior fitting areas 103 and right thigh root posterior fitting areas 104 located on the left and right sides of the first notch 108. The lumbar fitting area 101 fits against the patient's lumbar region, the buttock fitting area 102 fits against the patient's buttocks, the left thigh root posterior fitting area 103 fits against the posterior side of the patient's left thigh root, and the right thigh root posterior fitting area 104 fits against the posterior side of the patient's right thigh root.
[0037] Preferably, to further limit and fix the pelvis and improve comfort during use, the second fixation plate 2 includes an upper abdominal contact area 201 and lower areas located on the left and right sides of the second notch 207, namely, a left thigh root anterior contact area 202 and a right thigh root anterior contact area 203. The abdominal contact area 201 is in contact with the patient's abdomen, the left thigh root anterior contact area 202 is in contact with the front of the patient's left thigh root, and the right thigh root anterior contact area 203 is in contact with the front of the patient's right thigh root.
[0038] Preferably, to enhance the bottom fixing force and prevent the first fixing plate 1 and the second fixing plate 2 from separating, the left thigh root posterior contact area 103 extends downward to form a first left extension area 105, and the right thigh root posterior contact area 104 extends downward to form a first right extension area 106. The left first fixing piece 107 extends downward to the first left extension area 105, and the right first fixing piece 107 extends downward to the first right extension area 106. The left and right sides of the first notch fixing piece 109 extend downward to the first left extension area 105 and the first right extension area 106, respectively. The left thigh root anterior contact area 202 extends downward to form a second left extension area 204, and the right thigh root anterior contact area 203 extends downward to form a second right extension area 205. The left second fixing piece 206 extends downward to the second left extension area 204. The right second fixing piece 206 extends downward to the second right extension area 205. The second notch fixation piece 208 extends downwards on its left and right sides to the second left extension area 204 and the second right extension area 205, respectively. The first notch fixation piece 109 in the first left extension area 105 and the first right extension area 106, and the second notch fixation piece 208 in the second left extension area 204 and the second right extension area 205 are each equipped with a third fixation device 5. In use, the third fixation device 5 fixes the first fixation plate 1 and the second fixation plate 2 together. The third fixation device 5 further enhances the bottom fixation force, preventing the first fixation plate 1 and the second fixation plate 2 from separating, thereby increasing the tightness of the pelvis.
[0039] Optionally, this application provides a preferred embodiment of the first fixing device 3, the second fixing device 4, and the third fixing device 5, specifically: the first fixing device 3, the second fixing device 4, and the third fixing device 5 all include binding ropes; fixing holes are provided in the first fixing plate 107 and its corresponding second fixing plate 206; fixing holes are also provided in the first notched fixing plate 109 and its corresponding second notched fixing plate 208. In use, the binding ropes are passed through the fixing holes to bind the first fixing plate 1 and the second fixing plate 2 together.
[0040] Optionally, this application provides another preferred embodiment of the first fixing device 3, the second fixing device 4, and the third fixing device 5, specifically as follows: Figures 4 to 9As shown, the first fixing device 3, the second fixing device 4, and the third fixing device 5 are all locking devices. Each locking device includes a flexible steel rope 6 and a locking sleeve. One end of the flexible steel rope 6 is fixed to the first fixing plate 107 or the first notched fixing plate 109. Specifically, the bottom of the flexible steel rope 6 has an insertion post with an outer diameter smaller than the outer diameter of the flexible steel rope 6. The first fixing plate 107 or the first notched fixing plate 109 has an insertion hole that matches the outer diameter of the insertion post. The insertion post passes through the insertion hole and is threadedly connected to the flexible steel rope fixing plate 11. Rotating the flexible steel rope fixing plate 11 fixes the flexible steel rope 6 to the first fixing plate 107 or the first notched fixing plate 109. The locking sleeve includes a fixing sleeve 7 installed on the second fixing plate 206 or the second notched fixing plate 208. Specifically, a raised annular sleeve mounting platform 702 is provided on the top of the fixing sleeve 7. The second fixing plate 206 or the second notched fixing plate 208 has a mounting hole that matches the outer diameter of the fixing sleeve 7. The top end of the fixing sleeve 7 passes through the mounting hole and is threaded to the sleeve fixing plate 12. By rotating the sleeve fixing plate 12, the fixing sleeve 7 is installed on the second fixing plate 206 or the second notched fixing plate 208. The outer diameter of the soft steel rope 6 matches the hole diameter of the fixing sleeve 7. Multiple annular locking grooves 601 are evenly distributed on the outer wall of the middle part of the soft steel rope 6. A pair of inlay grooves 701 are symmetrically opened on the left and right sides of the bottom of the side wall of the fixing sleeve 7. The front and rear side walls of the inlay grooves 701 are hinged with locking buttons 8. The area above the hinge of the locking button 8 is the locking part 802, and the area below is the pressing part 801, which has an S-shaped structure. A support piece 9 is provided in the inlay groove 701 on the outer side of the engaging part 802. A spring 10 is provided between the support piece 9 and the engaging part 802 to push the engaging part 802 so that its top extends into the slot 601. In use, the top of the soft steel rope 6 is inserted into the fixing sleeve 7, and the soft steel rope 6 is pulled up. The slot 602 moves the engaging part 802 back, and the soft steel rope 6 can move freely upward, so that the first fixing plate 1 and the second fixing plate 2 are fastened together. After stopping the upward pull and releasing the soft steel rope 6, the spring 10 pushes the engaging part 802, and its top extends into the slot 601, preventing the soft steel rope 6 from moving down, thereby fixing the first fixing plate 1 and the second fixing plate 2 together. When disassembly is required, the pressing part 801 is pressed down, and the top of the engaging part 802 disengages from the slot 601. The soft steel rope 6 can move freely downward, so that the first fixing plate 1 and the second fixing plate 2 are released and separated.
[0041] Preferably, in order to increase the friction when pulling the soft steel rope 6, a spiral anti-slip groove 602 is provided on the top of the soft steel rope 6.
[0042] Preferably, since the first fixation plate 1 and the second fixation plate 2 are fixed outside the patient for a long time, in order to enhance comfort, the first fixation plate 1, the second fixation plate 2, the first left extension area 105, the first right extension area 106, the second left extension area 204, and the second right extension area 205 are all provided with multiple through-ventilation holes.
[0043] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.
Claims
1. A three-dimensional fixation brace for fixing pelvic fractures, characterized in that, The system includes a first fixing plate (1) and a second fixing plate (2); the first fixing plate (1) has an inverted V-shaped first notch (108) at the center of its bottom; the second fixing plate (2) has an inverted V-shaped second notch (207) at the center of its bottom; the first fixing plate (1) has a first fixing piece (107) on both its left and right sides; the second fixing plate (2) has a second fixing piece (206) on both its left and right sides; a first notch fixing piece (109) is provided along the outer periphery of the first notch (108); a second notch fixing piece (208) is provided along the outer periphery of the second notch (207); the first fixing piece (107) and the second fixing piece (206) on both the left and right sides are provided with at least three sets of first fixing devices (3); the first notch fixing piece (109) and the second notch fixing piece (208) on both the left and right sides are provided with second fixing devices (4); the first fixing devices (3) and the second fixing devices (4) are used to fix the first fixing plate (1) and the second fixing plate (2) together.
2. A three-dimensional fixation brace for pelvic fracture fixation according to claim 1, characterized in that, The first fixing plate (1) includes an upper waist fitting area (101), a middle buttock fitting area (102), and a lower left thigh root posterior fitting area (103) and a right thigh root posterior fitting area (104) located on the left and right sides of the first notch (108); the waist fitting area (101) fits against the patient's waist; the buttock fitting area (102) fits against the patient's buttocks; the left thigh root posterior fitting area (103) fits against the patient's left thigh root posterior side; and the right thigh root posterior fitting area (104) fits against the patient's right thigh root posterior side.
3. A three-dimensional fixation brace for pelvic fracture fixation according to claim 2, characterized in that, The second fixing plate (2) includes an upper abdominal fitting area (201) and a lower left thigh root anterior fitting area (202) and a right thigh root anterior fitting area (203) located on the left and right sides of the second notch (207); the abdominal fitting area (201) fits against the patient's abdomen; the left thigh root anterior fitting area (202) fits against the front of the patient's left thigh root; and the right thigh root anterior fitting area (203) fits against the front of the patient's right thigh root.
4. A three-dimensional fixation brace for pelvic fracture fixation according to claim 3, characterized in that, The left thigh root posterior contact area (103) extends downward to form a first left extension area (105); the right thigh root posterior contact area (104) extends downward to form a first right extension area (106); the left side of the first fixing piece (107) extends downward to the first left extension area (105); the right side of the first fixing piece (107) extends downward to the first right extension area (106); the left and right sides of the first notch fixing piece (109) extend downward to the first left extension area (105) and the first right extension area (106) respectively; the left thigh root anterior contact area (202) extends downward to form a second left extension area (204); the right thigh root anterior contact area (203) extends downward to form a second right extension area (205). The second fixing piece (206) on the left extends downward to the second left extension area (204); the second fixing piece (206) on the right extends downward to the second right extension area (205); the second notch fixing piece (208) on the left and right sides extends downward to the second left extension area (204) and the second right extension area (205) respectively; the first notch fixing piece (109) in the first left extension area (105) and the first right extension area (106) and the second notch fixing piece (208) in the second left extension area (204) and the second right extension area (205) are all provided with a third fixing device (5); the third fixing device (5) is used to fix the first fixing plate (1) and the second fixing plate (2) together.
5. A three-dimensional fixation brace for pelvic fracture fixation according to claim 4, characterized in that, The first fixing device (3), the second fixing device (4) and the third fixing device (5) each include a binding rope and a fixing hole; the fixing hole is opened in the first fixing plate (107) and the corresponding second fixing plate (206), or the first notched fixing plate (109) and the corresponding second notched fixing plate (208); the binding rope passes through the fixing hole to bind the first fixing plate (1) and the second fixing plate (2) together.
6. A three-dimensional fixation brace for pelvic fracture fixation according to claim 4, characterized in that, The first fixing device (3), the second fixing device (4), and the third fixing device (5) are all locking devices; the locking device includes a soft steel rope (6) with one end fixed to the first fixing plate (107) or the first notched fixing plate (109) and a locking sleeve; the locking sleeve includes a fixing sleeve (7) installed on the second fixing plate (206) or the second notched fixing plate (208); the outer diameter of the soft steel rope (6) is adapted to the hole diameter of the fixing sleeve (7); a plurality of annular locking grooves (601) are evenly distributed on the outer wall of the middle part of the soft steel rope (6); the fixing A pair of inlay grooves (701) are symmetrically opened on the left and right sides of the bottom of the side wall of the sleeve (7); the front and rear side walls of the inlay grooves (701) are hinged with locking buttons (8); the area above the hinge of the locking button (8) is the locking part (802), and the area below is the pressing part (801), which has an S-shaped structure; a support piece (9) is provided in the inlay groove (701) outside the locking part (802); a spring (10) is provided between the support piece (9) and the locking part (802) for pushing the locking part (802) so that its top extends into the slot (601).
7. A three-dimensional fixation brace for pelvic fracture fixation according to claim 6, characterized in that, The top of the soft steel rope (6) is provided with a spiral anti-slip groove (602).
8. A three-dimensional fixation brace for pelvic fracture fixation according to claim 4, characterized in that, The first fixing plate (1), the second fixing plate (2), the first left extension area (105), the first right extension area (106), the second left extension area (204), and the second right extension area (205) are all made of flexible non-elastic material.
9. A three-dimensional fixation brace for pelvic fracture fixation according to claim 4, characterized in that, The first fixing plate (1), the second fixing plate (2), the first left extension area (105), the first right extension area (106), the second left extension area (204), and the second right extension area (205) are all provided with multiple through-hole ventilation holes.