Adjustable distractor with self-locking mechanism

Abstract

The utility model discloses adjustable struts with self-locking mechanism belongs to the field of medical devices, propose a kind of adjustable struts with self-locking function, realize the stepless expansion of working pipeline size, to adapt to the demand of different intraoperative scene to different size of working pipeline, while with self-locking function guarantee struts keep stable state in any position. Including the support sheet of two groups of half cylinder that are hinged by pin shaft, there is working end extending to the side of pin shaft in each group of support sheet, working end is connected to a group of connecting rod assembly, adjusting knob for adjusting the opening angle of working end is set in the side end of connecting rod assembly.

Description

Technical Field

[0001] This application belongs to the field of medical devices, and specifically proposes an adjustable retractor with a self-locking mechanism for stabilizing and retracting skin and muscle tissue during surgery. Background Technology

[0002] With the rapid development of endoscopic technology, the use of endoscopes for spinal surgery has become increasingly widespread. During percutaneous endoscopic discectomy (PED), the soft tissue is gradually expanded using a series of dilators to allow for the insertion of the working tube and to provide access for the endoscope. This process protects the soft tissue while keeping the skin and soft tissue continuously open to facilitate surgical manipulation.

[0003] Current medical technology typically uses a cylindrical working tube with a handle, which is a rigid structure with relatively fixed dimensions and shapes. When spinal fusion surgery is required, the fusion device implanted in the intervertebral space is usually larger than the working tube, necessitating the replacement with a larger working tube to protect soft tissue. This leads to issues such as repositioning of the working tube and secondary damage to the soft tissue, and also increases the complexity of the surgical procedure and the difficulty of postoperative recovery for the patient.

[0004] Drawing on this, this patent application is hereby filed. Utility Model Content

[0005] The adjustable spreader with a self-locking mechanism described in this application aims to address the shortcomings of the prior art by proposing an adjustable spreader with a self-locking function to achieve stepless expansion of the working tube size, so as to adapt to the different size requirements of the working tube in different surgical scenarios, while ensuring that the spreader remains stable in any position with the self-locking function.

[0006] To achieve the above design objective, the adjustable spreader with a self-locking mechanism includes two sets of semi-cylindrical support plates hinged by a pin. Each set of support plates has a working end extending to one side of the pin. The working end is connected to a set of linkage assemblies. An adjustment knob for adjusting the opening angle of the working end is provided on the side of the linkage assembly.

[0007] Furthermore, each set of support plates has a structure that is wider at the top and narrower at the bottom, and the two sets of support plates are closed by a pin to form a conical cylindrical structure with openings at the top and bottom.

[0008] Furthermore, each set of support pieces has an outwardly open collar structure at its top and an array of annular concave or convex grooves on its outer wall.

[0009] Furthermore, the connecting rod assembly includes a mounting base and two sets of connecting rods. The two ends of each set of connecting rods are rotatably connected to a set of working ends and one end of a nut via a set of pins. The vertical ends of the pin shaft and the two sets of screw seats are fixedly connected to the mounting base. The screws are respectively sleeved and connected to the nut and the two sets of screw seats. The nut is located between the two sets of screw seats. An adjustment knob is fixedly connected to the outer end of the screw.

[0010] Furthermore, the internal and external threads between the screw and the nut are trapezoidal threads.

[0011] In summary, the adjustable expander with a self-locking mechanism has the following advantages:

[0012] 1. This application meets the clinical requirements for minimally invasive, visualized, and safe surgery, and has high applicability to endoscopic fusion surgery and widely compatible follow-up treatment methods, which significantly improves surgical efficiency and shortens time, and reduces patient pain.

[0013] 2. This application can achieve infinite expansion of the working channel size, thereby effectively adapting to the different size requirements of the working channel in different surgical scenarios, reducing surgical operation steps and damage to the patient's soft tissue.

[0014] 3. This application can achieve stable self-locking after the tube expands the skin and muscle tissue, which is easy to operate and helps surgeons to efficiently perform the insertion of working channels and the entry and exit of endoscopes. Attached Figure Description

[0015] The design scheme of this application will now be further illustrated with reference to the following figures.

[0016] Figure 1 This is a schematic diagram of the adjustable expander with a self-locking mechanism.

[0017] Figure 2 This is a schematic diagram of the structure of support piece 2;

[0018] Figure 3 This is a schematic diagram of the connection structure between the support plate and the connecting rod assembly;

[0019] Figure 4 This is a schematic diagram of the meshing connection between the screw and the nut;

[0020] Figure 5 This is a schematic diagram illustrating the insertion of surgical instruments into the human body for surgical procedures. Detailed Implementation

[0021] Other advantages and features of this application can be derived from the following description, in which embodiments are elaborated in detail with reference to the accompanying drawings.

[0022] Example 1, as Figures 1 to 5As shown, a novel adjustable spreader with a self-locking mechanism for spinal surgery includes two sets of semi-cylindrical support plates 2 hinged together by a pin 1. Each set of support plates 2 has a working end 21 extending to one side of the pin 1. The working end 21 is connected to a set of connecting rod assemblies 4. An adjustment knob 3 is provided on the side of the connecting rod assembly 4 for adjusting the opening angle of the working end 21. By rotating the adjustment knob 3, the connecting rod assembly 4 drives the two sets of working ends 21 to open and close around the axis with the working end 21, thereby adjusting the two sets of support plates 2 to open or close relative to each other. Ultimately, the two sets of support plates 2 expand stepwise to open up the soft tissue of the human body and provide an entry and exit channel for the working tube and endoscope.

[0023] The connecting rod assembly 4 includes a mounting base 41 and two sets of connecting rods 42. The two ends of each set of connecting rods 42 are rotatably connected to a set of working ends 21 and one end of a nut 43 by a set of pins. The vertical ends of the pin 1 and the two sets of screw seats 45 are fixedly connected to the mounting base 41. The screw 44 is respectively sleeved and connected to the nut 43 and the two sets of screw seats 45. The nut 43 is located between the two sets of screw seats 45. An adjustment knob 3 is fixedly connected to the outer end of the screw 44.

[0024] The adjustment knob 3 can be manually controlled to rotate. While the screw 44 rotates on its fixed axis, the nut 43 moves along the axial direction of the screw 44. This converts the rotation of the adjustment knob 3 into the linear motion of the nut 43, which in turn causes the connecting rod 42 to move at one end, changing the position of its hinge point with the working end 21. Finally, the opening and closing of the two sets of support plates 2 are achieved through the opening and closing of the working end 21.

[0025] Furthermore, to improve the stability of the two sets of support plates 2 in their open and closed states, the internal and external threads between the screw 44 and the nut 43 are trapezoidal threads 46. That is, the self-locking performance of the connection via the trapezoidal threads 46 means that the rotational movement of the screw 44 driven by the adjusting knob 3 can only be converted into the axial movement of the nut 43; conversely, the nut 43 cannot drive the adjusting knob 3 to rotate, thus achieving the self-locking of the connecting rod assembly 4.

[0026] Each set of support plates 2 has a structure that is wider at the top and narrower at the bottom. The two sets of support plates 2 are closed by a pin 1 to form a conical cylindrical structure with openings at the top and bottom, which can provide a larger swing angle for surgical instruments during operation, thereby achieving a larger operating space.

[0027] Each set of support plates 2 has an outwardly open collar structure 23 at its top and an array of annular concave or convex grooves 22 on its outer wall. The collar structure 23 is conducive to further expanding the swing angle of the surgical instruments during the operation, while the concave or convex grooves 22 can increase the friction of the smooth surface of the support plate 2, thereby improving the stability of the retractor in the soft tissue and avoiding displacement of the retractor due to friction between the surgical instruments 5 and the retractor when they enter and exit.

[0028] like Figure 4 As shown, based on the above-mentioned adjustable retractor with a self-locking mechanism, the connecting rod assembly 4 is controlled by adjusting the knob 3 to drive the two sets of support plates 2 to open and close synchronously, thereby safely and reliably positioning the retractor in the soft tissue, and then the surgical instruments 5 can be inserted into the human body through the retractor to perform various percutaneous endoscopic lumbar discectomy operations.

[0029] In summary, the embodiments shown in the accompanying drawings are merely preferred solutions. Those skilled in the art can draw inspiration from these embodiments and directly derive other alternative structures that conform to the design concept of this utility model; all such alternative structures should fall within the scope of protection described in this application.

Claims

1. An adjustable spreader with a self-locking mechanism, characterized in that: It includes two sets of semi-cylindrical support plates hinged by a pin. Each set of support plates has a working end extending to one side of the pin. The working end is connected to a set of linkage assemblies. An adjustment knob for adjusting the opening angle of the working end is provided on the side of the linkage assembly.

2. The adjustable spreader with a self-locking mechanism according to claim 1, characterized in that: Each set of support plates has a structure that is wider at the top and narrower at the bottom. The two sets of support plates are closed by a pin to form a conical cylindrical structure with openings at the top and bottom.

3. The adjustable spreader with a self-locking mechanism according to claim 1 or 2, characterized in that: Each set of support pieces has an outwardly open collar structure at its top and an array of annular concave or convex grooves on its outer wall.

4. The adjustable spreader with a self-locking mechanism according to claim 1, characterized in that: The connecting rod assembly includes a mounting base and two sets of connecting rods. The two ends of each set of connecting rods are rotatably connected to a set of working ends and one end of a nut by a set of pins. The vertical ends of the pin shaft and the two sets of screw seats are fixedly connected to the mounting base. The screws are respectively sleeved and connected to the nut and the two sets of screw seats. The nut is located between the two sets of screw seats. An adjustment knob is fixedly connected to the outer end of the screw.

5. The adjustable spreader with a self-locking mechanism according to claim 4, characterized in that: The internal and external threads between the screw and the nut are trapezoidal threads.

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