Internal fixation system for pelvic posterior ring fracture

Abstract

A pelvic posterior ring fracture internal fixation system comprises a longitudinal connector, a screw and a transverse rod, and the longitudinal connector comprises a longitudinal rod, a first connecting piece and a second connecting piece; the longitudinal rod is sleeved with the first connecting piece in a sliding mode, and the first connecting piece is connected with the screw. The second connecting piece is located at the lower end of the longitudinal rod, and the transverse rod is sleeved with the second connecting piece in a sliding mode; the first connecting piece and the second connecting piece intersect on a horizontal projection plane; the two ends of the transverse rod are both in sliding connection with the rotating assembly. The rotating assembly is attached to the ilium; the rotating assembly is provided with a universal locking hole. According to the utility model, the overall anti-rotation force is improved; the traditional Chinese medicine composition can be well applied to elderly patients suffering from pelvic posterior ring injury with osteoporosis so as to cope with the elderly patients suffering from osteoporosis.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an internal fixation system for posterior pelvic ring fractures. Background Art

[0002] Pelvic fracture is the most serious injury in trauma orthopedics, mostly caused by high-energy injuries such as traffic accidents and falls from heights, and is often accompanied by damage to important surrounding nerves, blood vessels and organs, with extremely high disability and mortality rates. The pelvis serves as the mechanical conversion center between the trunk and lower limbs, and 60% of the stability of the pelvic ring comes from the posterior ring structure. Therefore, reconstructing the anatomical structure of the posterior pelvic ring is crucial to restoring the stability of pelvic fractures. However, there is still a lack of ideal internal fixation devices for posterior pelvic ring fractures, making pelvic fracture surgery more difficult and risky.

[0003] Fracture dislocation around the sacroiliac joint is the most common cause of posterior pelvic instability. Traditional fixation methods include sacroiliac screws, tension band plates, and iliopelvic fixation. Sacroiliac screw fixation is less invasive, with mild soft tissue damage and a low postoperative infection rate. However, the risk of vascular and nerve damage with sacroiliac screws is relatively high, about 2%-15%, and it cannot provide vertical stability. Especially for elderly patients with osteoporosis, screw loosening and secondary fracture displacement often occur. Tension band plates are easy to operate and have a short learning curve. They can better maintain the horizontal stability of the posterior pelvic ring, but they also cannot provide vertical stability between the spine and pelvis. Iliolumbar fixation can provide vertical and horizontal stability of the posterior pelvic ring. The disadvantages are that the operation is traumatic, the postoperative recovery time is long, and the inserted iliac screw cap protrudes, which can easily cause skin pressure irritation, and complications such as wound infection, wound effusion, and skin damage caused by internal fixation bulge. It is often necessary to bite off a 1.5 cm deep groove at the insertion point of the iliac screw to prevent the screw tail cap from protruding.

[0004] In recent years, various internal fixation devices for posterior pelvic ring fractures have been reported, such as the Chinese patent application "A minimally invasive fixator for posterior pelvic ring fractures" (application number: 201310044989.1) and the Chinese patent application "Multidimensional internal fixation device and method for treating posterior pelvic ring fractures and dislocations" (application number: 202110863588.3). They can overcome the shortcomings of traditional fixation methods to a certain extent, but there are still disadvantages such as protruding tail caps of iliac screws, risks of irritating the skin, and insufficient anti-rotational force of the screws, which cannot cope with elderly patients with osteoporosis.

[0005] Therefore, it is necessary to develop an internal fixation system for posterior pelvic ring fractures that can solve the above clinical problems. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide an internal fixation system for posterior pelvic ring fractures.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a pelvic posterior ring fracture internal fixation system, characterized in that: it includes a longitudinal connector, a screw and a transverse rod, the longitudinal connector includes a longitudinal rod, a first connecting member and a second connecting member; the first connecting member is slidably mounted on the longitudinal rod, and the first connecting member is connected to the screw;

[0008] The second connecting member is located at the lower end of the longitudinal rod, and the second connecting member is slidably mounted on the transverse rod; the first connecting member and the second connecting member intersect on a horizontal projection plane;

[0009] Both ends of the transverse rod are slidably connected to the rotating assembly;

[0010] The rotating assembly is provided with a universal locking hole.

[0011] In the above technical solution, the rotating assembly includes a vertical assembly and a horizontal assembly, the upper end of the vertical assembly is slidably connected to the transverse rod; the horizontal assembly is connected to the lower end of the vertical assembly, and the universal locking hole is located on the horizontal assembly.

[0012] In the above technical solution, the number of the longitudinal connectors is greater than or equal to 2.

[0013] In the above technical solution, there are three universal locking holes.

[0014] In the above technical solution, the screw is a sacral pedicle screw.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1) The utility model ensures lateral stability by connecting the transverse rod with the rotating assembly, and ensures longitudinal stability by connecting the transverse rod with the longitudinal connector; the good holding force of the rotating assembly cooperates with the pedicle screws longitudinally connected on the rear transverse rod to form a firm triangular fixation against longitudinal displacement, thereby improving the overall anti-rotation force; the utility model can be well applied to elderly patients with posterior pelvic ring injuries combined with osteoporosis, so as to cope with elderly patients combined with osteoporosis.

[0017] 2) The utility model can fix various crescent-shaped fractures by rotating the T-shaped rotating component according to the fracture line, and can also be applied to different pelvic posterior ring fracture and dislocation injuries such as sacral fracture and sacroiliac joint dislocation, thereby enhancing the practicality and stability of the utility model.

[0018] 3) A universal locking screw can be inserted into the rotating assembly of the utility model. According to the fracture line, a universal locking screw can be inserted into the outer plate side of the ilium to fix the ilium and sacroiliac joint, and connected with the transverse rod to form a multi-dimensional fixation, which is particularly suitable for elderly patients with osteoporosis. It not only overcomes the shortcomings of traditional sacroiliac screws that damage nerves and blood vessels due to "in-out-in", but also overcomes the risk of skin irritation of the tail cap of the iliac screw in traditional iliac-lumbar fixation, thereby reducing the probability of wound infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of Example 1.

[0020] Figure 2 It is the left view of Example 1.

[0021] Figure 3 This is a schematic diagram of the structure of Example 2.

[0022] Figure 4 This is a front view of the utility model installed on the posterior pelvic ring.

[0023] Figure 5 This is a top view of the utility model installed on the posterior pelvic ring.

[0024] Among them, 1-longitudinal connector, 11-longitudinal rod, 12-first connecting piece, 13-second connecting piece, 2-screw, 3-transverse rod, 4-rotation assembly, 41-universal locking hole, 42-vertical assembly, 43-horizontal assembly, 5-universal locking screw, 6-posterior pelvic ring. DETAILED DESCRIPTION

[0025] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0026] Referring to the attached drawings, it can be seen that: a pelvic posterior ring fracture internal fixation system comprises a longitudinal connector 1, a screw 2 and a transverse rod 3, wherein the longitudinal connector 1 comprises a longitudinal rod 11, a first connecting member 12 and a second connecting member 13; the first connecting member 12 is slidably mounted on the longitudinal rod 11, and the first connecting member 12 is connected to the screw 2;

[0027] The second connecting member 13 is located at the lower end of the longitudinal rod 11, and the second connecting member 13 can be slidably mounted on the transverse rod 3 to ensure overall longitudinal stability; the first connecting member 12 and the second connecting member 13 intersect on the horizontal projection plane to ensure three-dimensional fixation in the longitudinal and transverse directions, thereby improving the overall anti-rotation force;

[0028] Both ends of the transverse rod 3 are slidably connected to the rotating assembly 4;

[0029] The rotating assembly 4 is provided with a universal locking hole 41, and the entry angle is adjusted according to actual use conditions.

[0030] The rotating component 4 includes a vertical component 42 and a horizontal component 43, the upper end of the vertical component 42 is slidably connected to the transverse rod 3; the horizontal component 43 is connected to the lower end of the vertical component 42, and the universal locking hole 41 is located on the horizontal component 43; the rotating component 4 is T-shaped, and various crescent fractures can be fixed by rotating the rotating component 4 according to the fracture line, and it can be suitable for different pelvic posterior ring fracture and dislocation injuries such as sacral fractures and sacroiliac joint dislocations; the good holding force of the rotating component 4 combined with the rear transverse rod 3 can be well suitable for elderly patients with pelvic posterior ring injuries combined with osteoporosis.

[0031] The number of the longitudinal connectors 1 is greater than or equal to 2, and longitudinal S1 / L4 / L5 screws can be connected to the transverse rod as needed to resist longitudinal displacement, form a firm triangular fixation, and improve the overall anti-rotation force.

[0032] There are three universal locking holes 41, which can pass through the fracture line and be fixed to the sacroiliac joint to form a multi-dimensional plate-nail fixation, which is suitable for different pelvic posterior ring fracture-dislocation injuries such as sacral fracture and sacroiliac joint dislocation.

[0033] The screw 2 is a sacral pedicle screw, which reduces the difficulty of screw placement and the risk of neurovascular injury.

[0034] Example 1

[0035] like Figure 1 , Figure 2 As shown, a pelvic posterior ring fracture internal fixation system comprises a longitudinal connector 1, a screw 2 and a transverse rod 3, wherein the longitudinal connector 1 comprises a longitudinal rod 11, a first connecting member 12 and a second connecting member 13; the first connecting member 12 is slidably mounted on the longitudinal rod 11, and the first connecting member 12 is connected to the screw 2;

[0036] The second connecting member 13 is located at the lower end of the longitudinal rod 11, and the second connecting member 13 can be slidably mounted on the transverse rod 3 to ensure overall longitudinal stability; the first connecting member 12 and the second connecting member 13 intersect on the horizontal projection plane to ensure three-dimensional fixation in the longitudinal and transverse directions, thereby improving the overall anti-rotation force;

[0037] Both ends of the transverse rod 3 are slidably connected to the rotating assembly 4;

[0038] The rotating assembly 4 is an iliac bone steel plate, and the rotating assembly 4 is provided with a universal locking hole 41, and the entry angle is adjusted according to actual use conditions.

[0039] The number of the longitudinal connectors 1 is greater than or equal to 2, and the longitudinal S1 / L4 / L5 screws 2 can be connected to the transverse rod as needed to resist longitudinal displacement, form a firm triangular fixation, and improve the overall anti-rotation force.

[0040] There are four universal locking holes 41, which can pass through the fracture line and be fixed to the sacroiliac joint to form a multi-dimensional plate-nail fixation, which is suitable for different pelvic posterior ring fracture-dislocation injuries such as sacral fracture and sacroiliac joint dislocation.

[0041] The screw 2 is a sacral pedicle screw, which reduces the difficulty of screw placement and the risk of neurovascular injury.

[0042] Example 2

[0043] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that: the rotating component 4 includes a vertical component 42 and a horizontal component 43, and the upper end of the vertical component 42 is slidably connected to the transverse rod 3; the horizontal component 43 is connected to the lower end of the vertical component 42, and the universal locking hole 41 is located on the horizontal component 43, and there are three universal locking holes 41; the rotating component 4 is a T-shaped iliac steel plate, and the rotating component 4 is rotated according to the fracture line to fix various crescent fractures, and can be suitable for different pelvic posterior ring fractures and dislocation injuries such as sacral fractures and sacroiliac joint dislocations; the good holding force of the rotating component 4 combined with the rear transverse rod 3 can be well suitable for elderly patients with pelvic posterior ring injuries combined with osteoporosis. Figure 4 and Figure 5 These are the front view and top view of the utility model installed on the posterior ring of the pelvis.

[0044] Other parts not described belong to the prior art.

Claims

1. A posterior pelvic ring fracture internal fixation system, characterized in that: The invention comprises a longitudinal connector (1), a screw (2) and a transverse rod (3); the longitudinal connector (1) comprises a longitudinal rod (11), a first connecting member (12) and a second connecting member (13); the first connecting member (12) is slidably mounted on the longitudinal rod (11), and the first connecting member (12) is connected to the screw (2); The second connecting member (13) is located at the lower end of the longitudinal rod (11), and the second connecting member (13) is slidably mounted on the transverse rod (3); the first connecting member (12) and the second connecting member (13) intersect on a horizontal projection plane; Both ends of the transverse rod (3) are slidably connected to the rotating assembly (4); the rotating assembly (4) is arranged in close contact with the ilium (51); The rotating assembly (4) is provided with a universal locking hole (41).

2. The internal fixation system for posterior pelvic ring fracture according to claim 1, characterized in that: The rotating assembly (4) comprises a vertical assembly (42) and a horizontal assembly (43). The upper end of the vertical assembly (42) is slidably connected to the transverse rod (3); the horizontal assembly (43) is connected to the lower end of the vertical assembly (42), and the universal locking hole (41) is located on the horizontal assembly (43).

3. A posterior pelvic ring fracture internal fixation system according to claim 1 or 2, characterized in that: The number of the longitudinal connectors (1) is greater than or equal to 2.

4. The internal fixation system for posterior pelvic ring fracture according to claim 2, characterized in that: There are three universal locking holes (41).

5. The internal fixation system for posterior pelvic ring fracture according to claim 1 or 2, characterized in that: The screw (2) is a sacral pedicle screw.

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