Rigid expander

Abstract

The utility model discloses a rigid expander which comprises an inner tube and an outer tube which are sleeved together in a clearance mode, a threaded rod is arranged at the rear end of the inner tube, a handle ring capable of rotating freely is sleeved at the rear end of the outer tube in a limiting mode, and internal threads matched with the threaded rod are arranged on the inner side of the handle ring. A plurality of blades are movably arranged in the circumferential direction between the front end of the inner pipe and the front end of the outer pipe, and when the inner pipe and the outer pipe generate axial relative displacement, the blades expand in the radial direction or close in the radial direction; according to the scheme, the front end of the spine dilator can conduct radial dilation, so that soft tissue blocking the operation visual field in the channel is pushed aside, medical staff do not need to spend a large amount of time to clean the soft tissue blocking the visual field, the operation difficulty is lowered, the operation efficiency is improved, and postoperative pain caused by unnecessary soft tissue cleaning is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a rigid expander. Background Technology

[0002] Unilateral biportal endoscopy (UBE) is a minimally invasive spinal endoscopic surgery performed on the same side of the spine through two channels. UBE requires establishing an endoscopic observation channel and an instrumentation channel. The observation channel typically uses a 0° or 30° endoscope, while the instrumentation channel can utilize conventional spinal surgery and sports medicine instruments such as curettes, drills, arthroscopic radiofrequency ablation tips, laminectomy forceps, nucleus pulposus forceps, and nerve retractors. Specialized UBE instruments and consumables can also be used to perform central spinal canal decompression, bilateral nerve root and lateral recess decompression, and intervertebral fusion.

[0003] During a UBE procedure, the endoscope is inserted into the body through the observation channel, and the surgical instruments are inserted through the operating channel. The operator uses these instruments to perform procedures such as ablation and resection of the surgical site under the endoscopic view. A common problem in this process is that it is difficult to locate the instruments under endoscopic visualization. This is because the endoscopic observation channel is generally narrow, and a large amount of soft tissue often obstructs the view at the exit point. Locating the instruments requires a significant amount of time to clear this obstructing soft tissue, which increases unnecessary surgical trauma and prolongs the procedure, reducing its efficiency.

[0004] Therefore, there is an urgent need for an expander to clear away soft tissues that obstruct the surgical field of vision within the surgical channel, in order to shorten the operation time and improve the efficiency of the operation. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a rigid expander that solves the problem of high surgical difficulty and low efficiency caused by soft tissue obstructing the endoscopic field of view.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A rigid expander is provided, comprising an inner tube and an outer tube that are sleeved together with a gap. A threaded rod is provided at the rear end of the inner tube, and a freely rotatable handle ring is provided at the rear end of the outer tube. An internal thread that mates with the threaded rod is provided on the inner side of the handle ring. Several blades are circumferentially movable between the front ends of the inner tube and the front ends of the outer tube. When the inner tube and the outer tube undergo axial relative displacement, the blades expand radially or close radially.

[0008] Furthermore, the outer tube has several axially extending notches on its front end, and a first annular fixing seat is provided at the front end of the notches. The first annular fixing seat has several first protrusions on its front end, which correspond to the front end positions of the notches. The inner tube has a second annular fixing seat fitted on its front end, and the second annular fixing seat has several second protrusions on its front end. The second protrusions protrude from the notches. One end of each blade is pivotally connected to the second protrusions. The first protrusions are connected to the blades via connecting rods, and the two ends of the connecting rods are pivotally connected to the middle of the first protrusions and the blades, respectively.

[0009] Furthermore, the spacing between adjacent blades during radial contraction is set.

[0010] Furthermore, a retaining ring is provided at the rear end of the outer tube, an annular groove is provided on the outer side of the retaining ring, and an annular protrusion is provided on the inner side of the handle ring to cooperate with the annular groove.

[0011] Furthermore, the front end of the inner tube slides through the first annular fixed seat.

[0012] Furthermore, the blades are beveled curved plates.

[0013] Furthermore, both the inner and outer tubes are hollow tubes with openings at both ends.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The front end of the spinal expander in this solution can be radially expanded, thereby clearing away soft tissues that obstruct the surgical field of vision within the channel. This eliminates the need for medical staff to spend a lot of time clearing away soft tissues that obstruct the field of vision, thereby reducing the difficulty of the surgery, improving the efficiency of the surgery, and reducing postoperative pain caused by unnecessary soft tissue clearing.

[0016] 2. When using this method, after the blades at the front end of the spinal expander are kept closed and inserted into the human body, the medical staff rotates the handle ring, thereby driving the outer tube to move backward along the axis, so that the first protrusion gradually approaches the second protrusion, thereby expanding the blades radially through the connecting rod, thereby opening up the soft tissue in the channel. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rigid expander during blade expansion.

[0018] Figure 2 This is a schematic diagram of the rigid expander when the blades are closed.

[0019] Figure 3 This is a schematic diagram of the inner tube.

[0020] Figure 4 This is a schematic diagram of the outer tube.

[0021] Figure 5 This is a schematic diagram of the handle ring structure.

[0022] Among them, 1. Inner tube, 2. Outer tube, 3. Threaded rod, 4. Handle ring, 5. Blade, 6. Notch, 7. First annular fixing seat, 8. First protrusion, 9. Second annular fixing seat, 10. Second protrusion, 11. Connecting rod, 12. Snap ring, 13. Annular snap groove, 14. Annular protrusion. Detailed Implementation

[0023] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0024] like Figures 1 to 5 As shown, the rigid expander of this scheme includes an inner tube 1 and an outer tube 2 that are fitted together with a gap. Both the inner tube 1 and the outer tube 2 are hollow tubes with openings at both ends, providing an entry channel for the endoscope. A threaded rod 3 is provided at the rear end of the inner tube 1, and a freely rotatable handle ring 4 is fitted at the rear end of the outer tube 2. Specifically, a retaining ring 12 is provided at the rear end of the outer tube 2, and an annular groove 13 is provided on the outer side of the retaining ring 12. An annular protrusion 14 that mates with the annular groove 13 is provided on the inner side of the handle ring 4, and the freely rotatable handle ring 4 is axially limited by the annular groove 13. An internal thread that mates with the threaded rod 3 is provided on the inner side of the handle ring 4.

[0025] The outer tube 2 has three axially extending notches 6 on its front end. The front end of the three notches 6 is provided with a first annular fixing seat 7. The first annular fixing seat 7 is provided with three first protrusions 8 on its front end, which are respectively corresponding to the front end positions of the three notches 6. The front end of the inner tube 1 is fitted with a second annular fixing seat 9. The second annular fixing seat 9 is provided with three second protrusions 10 on its front end. The three second protrusions 10 protrude from the three notches 6 respectively. The three second protrusions 10 are pivotally connected to one end of the three blades 5 respectively. The three first protrusions 8 are connected to the three blades 5 respectively through a connecting rod 11. The two ends of the connecting rod 11 are pivotally connected to the middle of the first protrusions 8 and the blades 5 respectively.

[0026] The working principle of this solution will be explained in detail below:

[0027] When using this method, after the blade 5 at the front end of the rigid expander is kept closed and inserted into the human body, the medical staff rotates the handle ring 4, thereby driving the outer tube 2 to move backward along the axis, so that the first protrusion 8 gradually approaches the second protrusion 10, thereby radially opening the blade 5 through the connecting rod 11, thereby clearing away the soft tissue in the channel that is blocking the surgical field of vision. This eliminates the need for the medical staff to spend a lot of time clearing the soft tissue that is blocking the field of vision, thereby reducing the difficulty of the operation, improving the efficiency of the operation, and reducing postoperative pain caused by unnecessary soft tissue clearing. Similarly, when the blade 5 needs to be closed, the handle ring 4 can be rotated in the opposite direction.

[0028] Specifically, during operation, an endoscope sheath is inserted into the inner tube 1. The threaded rod 3 is provided with a corresponding threaded hole. A set screw can be passed through the threaded hole to fix the endoscope sheath to the inner tube 1, so that medical personnel can hold the sheath to limit and fix the inner tube 1. Then, by rotating the handle ring 4, the outer tube 2 can be moved forward and backward axially.

[0029] As an optional implementation, the gap between two adjacent blades 5 during radial contraction is set so that soft tissue can be effectively prevented from getting stuck between the blades 5 during the process of the three blades 5 from the expanded state to the closed state, thereby ensuring the safety of the operation.

[0030] As an optional implementation, the front end of the inner tube 1 is slidably mounted on the first annular fixed seat 7, which helps to improve the stability and reliability of the axial displacement of the inner tube 1.

[0031] As an optional implementation, the blade 5 is a chamfered arc-shaped plate, so that the three blades 5 can form an approximate tubular structure when closed, thereby reducing the radial dimension of the blade 5 when closed to a certain extent, which is beneficial for the front end of the spinal expander to extend into the surgical site of the human body.

Claims

1. A rigid expander, characterized in that, The device includes an inner tube and an outer tube that are fitted together with a gap. The rear end of the inner tube is provided with a threaded rod, and the rear end of the outer tube is limited by a freely rotatable shank ring. The inner side of the shank ring is provided with an internal thread that mates with the threaded rod. Several blades are movably arranged circumferentially between the front ends of the inner tube and the front ends of the outer tube. When the inner tube and the outer tube undergo axial relative displacement, the blades expand radially or close radially.

2. The rigid expander according to claim 1, characterized in that, The outer tube has several axially extending notches on its front end. A first annular fixing seat is provided at the front end of the notches. The first annular fixing seat has several first protrusions on its circumference, each corresponding to the front end position of the notches. The inner tube is fitted with a second annular fixing seat at its front end. The second annular fixing seat has several second protrusions on its circumference. The second protrusions protrude from the notches. One end of each blade is pivotally connected to the second protrusions. The first protrusions are connected to the blades via connecting rods. The two ends of the connecting rods are pivotally connected to the middle of the first protrusions and the blades, respectively.

3. The rigid expander according to claim 2, characterized in that, The spacing between two adjacent blades during radial contraction is set.

4. The rigid expander according to claim 1, characterized in that, The outer tube has a retaining ring at its rear end, an annular groove on its outer side, and an annular protrusion on its inner side that engages with the annular groove.

5. The rigid expander according to claim 1, characterized in that, The front end of the inner tube is slidably mounted on the first annular fixed seat.

6. The rigid expander according to claim 1, characterized in that, The blade is a chamfered arc-shaped plate.

7. The rigid expander according to claim 1, characterized in that, Both the inner and outer tubes are hollow tubes with openings at both ends.

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