A device for exposure and distraction of posterior lumbar spine surgery

Abstract

The present invention discloses a device for exposure and distraction during posterior lumbar surgery, comprising a first end fixing member, a universal connection mechanism, a main retractor, and a second end fixing member; the first end fixing member, one end of which is connected to one end of the universal connection mechanism; the universal connection mechanism, which is provided with two connection ends, and the head of each end can rotate in multiple planes and multiple angles. The main retractor is provided to be directly or indirectly connected to the other end on the side of the universal connection mechanism; the second end fixing member is provided at the end of the head of the main retractor. The main retractor is connected to the second end fixing member through its head end, and its tail end is connected to the first end fixing member through a series of connections, thereby achieving stability and exerting its distraction effect.

Description

Technical Field

[0001] The present invention relates to the technical field of posterior lumbar surgery, in particular to an exposure and distraction device used in posterior lumbar surgery. Background Art

[0002] In recent years, the number of patients suffering from low back and leg pain has increased year by year, seriously affecting people's physical health. Lumbar degenerative diseases such as lumbar disc herniation, lumbar spinal stenosis, and lumbar spondylolisthesis are common causes of low back and leg pain. Although most low back and leg pain can be relieved in the early stages through conservative treatments such as medication, physical therapy, and rest. However, if the patient's condition progresses and they experience a decrease in lower limb muscle strength, cauda equina syndrome, or symptoms that seriously affect their work and life, surgical treatment is often required. Posterior lumbar interbody fusion is currently a commonly used surgical treatment for lumbar degenerative diseases. During lumbar surgery, the doctor will make an incision along the longitudinal axis of the spine, then separate and expose the soft tissues of the waist and back, and then use retractors or distraction devices to distract the tissues on both sides of the spine to obtain a satisfactory surgical field of view, making it easier for the doctor to perform the operation.

[0003] Existing surgical field expansion devices are often connected to the operating table via a fixing device or are directly and freely supported in the soft tissue within the incision. Free expansion devices are prone to displacement during surgery. The surgical procedure may also cause the patient's position relative to the operating table to shift slightly. Traditional expansion devices fixed to the operating table may also shift on the patient, affecting the stability of the surgical field. During surgery, the expansion system is unstable and easily deviates from the surgical target, affecting surgical operation and surgical safety. Summary of the Invention

[0004] The purpose of the present invention is to provide a stable distraction device for posterior lumbar spine surgery, obtain a more stable operating field of view, facilitate surgical operation, and improve surgical efficiency and safety. The posterior lumbar distraction system is directly fixed to the patient's lumbar vertebral body through a special fixing device.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: comprising a first end fixing member, a universal connection mechanism, a main retractor hook and a second end fixing member;

[0006] a first end fixing member, one end of which is connected to one end of the universal connection mechanism;

[0007] The universal connection mechanism is provided with two connection ends, and the head of each end can rotate in multiple planes and at multiple angles.

[0008] A main retractor hook is directly or indirectly connected to the other end of the universal connection mechanism;

[0009] The second end fixing piece is arranged at the end of the head of the main retractor.

[0010] As a preference, it further comprises a working frame, a plurality of cross connection structures, and an auxiliary retractor;

[0011] The working frame is a rectangular frame, which is arranged between the universal connecting machine and the main hook. One side of the working frame is connected to the other end of the universal connecting mechanism. A cross connecting structure is provided on the opposite side of the working frame away from the universal connecting mechanism, and the main hook is connected to the cross connecting structure; the auxiliary hook is fixed to the working frame on the opposite side of the main hook through the cross connecting structure, and the main hook and the auxiliary hook can rotate at multiple planes and angles relative to the working frame.

[0012] Preferably, the first end fixing member comprises:

[0013] A T-shaped connecting rod, the vertical portion of which is connected to one end of the universal connecting mechanism via a thread;

[0014] Pedicle screws are arranged on both sides of the crossbar of the T-shaped connecting rod.

[0015] Preferably, the second end fixing member is a ball and socket joint, which is arranged at the head end of the main retractor; the screw has a sphere on the side of its tail, and the ball and socket joint at the head end of the main retractor is cooperatively connected with the spherical part of the screw.

[0016] Preferably, it further comprises a light source socket, which is arranged at the corner of the main hook.

[0017] Preferably, two more auxiliary hooks are included, which are connected through two cross structures and are arranged on the remaining two sides of the working frame.

[0018] Preferably, the T-shaped connecting rod and the pedicle screw constitute a detachable structure.

[0019] Compared with the existing technology, the beneficial effects of the present invention are: the distraction device used for posterior lumbar surgery exposure adopts the mutual cooperation between multiple mechanisms, has strong functionality, and uses direct fixation of a rigid structure to distract the lumbar surgical operation port, and fixes the distraction system to the patient's lumbar spine by connecting with screws placed on the lumbar vertebral body, avoiding instability of the channel system during the operation, resulting in deviation of the surgical target, and after the operation is completed, the pedicle screws fixed during the operation can be used to reduce the operation time.

[0020] 1. In the present invention, the pedicle screws are distributed at two places on the T-shaped connecting rod, with the first end fixing piece serving as the fixing piece on the upper side of the lumbar vertebra. The coccyx of the two pedicle screws fixed on one side of the lumbar vertebra is connected and fixed to the two ends of the horizontal bar part of the inverted "T" rod. The tail of the vertical rod of the T rod is connected to one end of the universal connection mechanism through a thread. The other end of the universal connection mechanism is connected to the threaded part of the working frame. By utilizing the multi-plane and multi-angle rotation functions of the heads at both ends of the universal connection mechanism, the mismatch between the T rod angle and the physiological lordosis angle of the lumbar spine can be avoided, which can cause difficulties in connecting the device and adjusting the position of the working frame. When the operation is completed, the T-shaped connecting rod is directly removed from the pedicle screw, and then the connecting rod of the normal pedicle screw is installed to avoid repeated screw placement of the lumbar pedicles and improve the convenience of using the distraction device.

[0021] 2. In the present invention, a screw is connected to a ball-and-socket joint by a ball attached to the side of the screw tail and a ball-and-socket joint at the head end of the main retractor. The screw with the ball is inserted into the pedicle on the other side of the lumbar vertebral body in the same intervertebral segment. The head end of the main retractor is connected to the screw via a ball-and-socket joint. The tail end of the main retractor is connected to the working frame via a cross connection structure and is located on both sides of the working frame in a relative relationship with the universal connection mechanism. One side of the working frame is fixed to one side of the lumbar vertebra via a universal connection mechanism, a T-rod, and two pedicle screws, while the other side of the working frame in a relative relationship is fixed to the other side of the lumbar vertebra via a cross connection structure, the main retractor, and the screw with the ball. In this way, the three screws that are not in a straight line can provide a planar fixation, which can stably fix the working frame above the lumbar incision. The working frame is a rectangular frame connected by four cross bars. Auxiliary retractors can be installed on the other three cross bars except for the one on which the main retractor is installed through the cross connection structure. In addition, during the operation and assembly process, the working frame can be disassembled and the auxiliary hook is not installed. By connecting one end of the universal connection mechanism to the vertical rod of the T-rod and the other end to the tail of the main hook, the pulling effect of the main hook can be stabilized to perform simple expansion, thereby improving the adaptability and convenience of the expansion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the top view of the structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the first end fixing member of the present invention;

[0025] Figure 4 This is a schematic diagram of the assembly structure of the first embodiment of the present invention;

[0026] Figure 5This is a schematic diagram of the assembly structure of the second embodiment of the present invention.

[0027] In the figure: 1. First end fixing member; 101. T-shaped connecting rod; 102. Pedicle screw; 103. Threaded arm; 2. Working frame; 3. Universal connection mechanism; 4. Cross connection structure; 5. Main retractor; 6. Second end fixing member; 601. Ball and socket joint; 602. Sphere; 603. Screw; 7. Auxiliary retractor; 8. Light source socket. DETAILED DESCRIPTION

[0028] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] like Figure 1-3As shown, the present invention provides a technical solution: a device for exposure and distraction during posterior lumbar spine surgery, comprising: a first end fixture 1, with a universal connection mechanism 3 disposed on an outer side of the first end fixture 1; the first end fixture 1 comprising: a T-shaped connecting rod 101 disposed on an outer side of a working frame 2; pedicle screws 102 disposed on both sides of the outer side of the T-shaped connecting rod 101; and a threaded arm 103 disposed at one end of the T-shaped connecting rod 101. The T-shaped connecting rod 101 is threadedly connected to the universal connection mechanism 3 via the threaded arm 103, and the T-shaped connecting rod 101 and the pedicle screws 102 form a detachable structure. The pedicle screws 102 are distributed at two locations on the T-shaped connecting rod 101. The first end fixing part 1 is used as the fixing part at the upper end of the lumbar vertebra, and the universal connecting mechanism 3 is used as a connecting part to adjust the connection angle between the T-shaped connecting rod and the working frame to make the working frame horizontal, and to fix the working frame to one side of the lumbar vertebral body to ensure the stability of the support during the operation. When the operation is completed, the T-shaped connecting rod 101 is directly disassembled and removed, and a normal pedicle screw connecting rod is installed to avoid repeated screw placement in the lumbar vertebra, thereby improving the convenience of using the distraction device.

[0031] like Figure 4As shown, the present invention provides a technical solution: a device for exposing and distracting the posterior lumbar spine surgery, wherein the working frame 2 is a rod-shaped rectangular frame, which is arranged on one side of the outside of the universal connection mechanism 3; the cross connection structure 4 is arranged on the two sides of the outside of the working frame 2; the main retractor 5 is arranged at one end of the cross connection structure 4; the auxiliary retractor 7 is arranged on the cross connection structure on the opposite side of the main retractor; the second fixing member 6 is arranged at a place at the head end of the main retractor 5; and the light source socket 8 is arranged at the corner of the main retractor 5. The working frame 2 is movably connected to the main retractor 5 by the cross connection structure 4, and the cross connection structure 4 is arranged at two places of the working frame. The second end fixing member 6 includes: a ball and socket joint 601, which is arranged at the head end of the main retractor 5; a sphere 602, which is arranged on the inner side of the ball and socket joint 601; and a screw 603, which is arranged on the outer side of the sphere 602. The ball-and-socket joint 601 and the main retractor 5 form a connection, and the main retractor 5 and the light source socket 8 form a fixed structure. The screw 603 forms a ball-and-socket joint connection through the sphere 602 and the ball-and-socket joint 601. The rigid working frame 2 is used as the operating space for the operation to avoid the operation being affected by the loosening of the working frame 2 during the operation. At the other end, the working frame 2 uses a cross connection structure 4 to adjust the angle of the main retractor 5 with the main retractor 5, so that the port of the main retractor 5 faces downward, and the port is connected to the second end fixing member 6. After the installation is completed, the ball-and-socket joint is used for connection, and the angle of the bottom screw 603 can be adjusted to facilitate fixation on one side of the lumbar spine. When the entire expansion width needs to be adjusted, the main retractor 5 is directly adjusted horizontally in the cross connection structure 4. One side of the working frame 2 is secured to one side of the lumbar vertebra via a universal connector 3, a T-rod, and two pedicle screws. The other side of the working frame, in a relative position, is secured to the other side of the lumbar vertebra via a cross-connection structure 4, a main retractor 5, and a spherical screw 603. These three screws define a plane defined by three points, allowing the working frame to be stably fixed above the lumbar incision, ensuring a stable surgical corridor. Furthermore, during assembly, the working frame 2 can be disassembled, and the auxiliary retractor 7 can be omitted. The universal connector is directly connected to the tail end of the main retractor 5 to stabilize the main retractor's retraction action, improving the adaptability and convenience of the distraction device.

[0032] like Figure 5As shown, the present invention provides a technical solution: a distraction device for posterior lumbar spine surgical exposure. One side of a universal connection mechanism 3 is connected to the tail end of a main retractor 5. The head end of the main retractor 5 is provided with a second end fixing member 6. The second end fixing member 6 includes: a ball and socket joint 601, which is arranged at the head of the main retractor 5; a ball 602, which is arranged on the inner side of the ball and socket joint 601; and a screw 603, which is arranged on the outer side of the ball 602. The other side of the universal connection mechanism 3 is connected to a first end fixing member 1. The first end fixing member 1 includes: a T-shaped connecting rod 101, pedicle screws 102, which are arranged on both sides of the outer side of the T-shaped connecting rod 101; and a threaded arm 103, which is arranged at one end of the T-shaped connecting rod 101. The T-shaped connecting rod 101 is threadedly connected to the universal connection mechanism 3 through the threaded arm 103, and the T-shaped connecting rod 101 and the pedicle screw 102 form a detachable structure. The pedicle screws 102 are distributed at two locations on the T-shaped connecting rod 101 .

[0033] In summary, the distraction device for exposing the lumbar posterior approach surgery, when in use, first insert two pedicle screws 102 into the pedicle on one side of the lumbar vertebral body of the surgical segment, and insert the screw 603 into the pedicle on the other side of the lumbar vertebral body of the same segment. Then the cross bar 2 sides at the bottom end of the T-shaped connecting rod 101 are connected and fixed with the pedicle screws 102. The tail of the T-shaped connecting rod 101 has an M5 threaded hole, which is connected to the M5 thread of one end of the universal connecting mechanism 3, and the M5 thread of the other end of the universal connecting mechanism 3 is connected to the protrusion on one side of the working frame 2, and the inside of the protrusion is also an M5 threaded hole for mosaic installation. Afterwards, the ball and socket joint 601 at the head end of the main retractor 5 is connected to the ball portion 602 at the tail end of the screw 603 to form a ball and socket joint. Then the main retractor 5 is connected to the working frame 2 through the cross connection structure 4. After adjusting the working frame to the ideal position, lock the universal connecting mechanism 3, and after adjusting the main retractor to the ideal traction angle, lock the cross connecting structure 4. Use the cross connecting structure 4 to install the auxiliary retractor 7 on the cross bar of the working frame 2 on the opposite side of the main retractor 5. You can also add auxiliary retractors to the remaining two cross bars of the working frame 2 through the cross connecting structure 4 as needed. This means that the entire distraction device has been completely fixed in the ideal position to obtain a stable surgical field of view. When the operation is completed, directly remove the T-shaped connecting rod 101 from the pedicle screw 102, and install a normal pedicle screw connecting rod in the pedicle screw 102, eliminating the need to re-screw. It is also very convenient to replace the screw 603 with a conventional pedicle screw.

[0034] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A device for exposure and distraction during posterior lumbar spine surgery, characterized by: It comprises a first end fixing member (1), a working frame (2), a universal connection mechanism (3), a plurality of cross connection structures (4), a main retractor (5), an auxiliary retractor (7) and a second end fixing member (6); A universal connection mechanism is provided with two connection ends; a first end fixing member (1), one end of the first end fixing member (1) is connected to one end of the universal connection mechanism (3); A main draw hook (5) is indirectly connected to the other end of the universal connection mechanism; the main draw hook (5) is an L-shaped structure; The second end fixing member (6) is a ball-and-socket joint member (601) which is arranged at the head end of the main retractor (5); a screw (603) is provided with a sphere on the side of its tail, and the ball-and-socket joint member (601) is partially connected to the sphere (602) of the screw (603); The working frame (2) is a rectangular frame, which is arranged between the universal connection mechanism (3) and the main hook (5). One side of the working frame (2) is connected to the other end of the universal connection mechanism (3). A cross connection structure (4) is provided on the side of the working frame (2) away from the universal connection mechanism (3), and the main hook (5) is connected to the cross connection structure (4); the auxiliary hook (7) is fixed to the working frame (2) on the opposite side of the main hook (5) through the cross connection structure, and the main hook (5) and the auxiliary hook (7) can rotate at multiple angles and multiple planes relative to the working frame.

2. The device for exposure and distraction during posterior lumbar spine surgery according to claim 1, characterized in that: The first end fixing member (1) comprises: A T-shaped connecting rod (101), the vertical portion of which is connected to one end of the universal connecting mechanism (3) via a thread (103); Pedicle screws (102) are arranged on both sides of the crossbar of the T-shaped connecting rod (101).

3. The device for exposure and distraction during posterior lumbar spine surgery according to claim 1, characterized in that: It also includes a light source socket (8), which is arranged at the corner of the main draw hook (5).

4. The device for exposure and distraction during posterior lumbar spine surgery according to claim 1, characterized in that: It also includes two cross connection structures (4), which are arranged on the remaining two sides of the working frame (2).

5. The device for exposure and distraction during posterior lumbar spine surgery according to claim 2, characterized in that: The T-shaped connecting rod (101) and the pedicle screw (102) form a detachable structure.

6. The device for exposure and distraction during posterior lumbar spine surgery according to claim 4, characterized in that: Auxiliary hooks are provided on the two cross connection structures (4).

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