A 3D-printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach

Abstract

The present invention provides a 3D-printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach, belonging to the field of medical device technology. It includes a positioning needle, the outer side of which is slidably connected to a hollow cone head, the inner side of which is provided with a positioning groove, the outer side of which is fixedly connected to a protrusion, and the hollow cone head is connected to an expansion component for expanding and limiting the entrance to the surgical area. The present invention provides a reamer and a retractor. The reamer is inserted into the incision, the reamer is sleeved on the outer side of the handle, slid down to the outer side of the reamer and inserted into the incision to expand the incision. The retractor is sleeved on the outer side of the reamer and slides downward into the incision to further expand the incision. When inserted into the incision, the center points of the retractors on both sides are aligned with the two ends of the incision, so that the retractor, the reamer and the incision are matched, thereby facilitating the insertion of the retractor into the incision and reducing the difficulty of inserting the retractor into the incision.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a 3D-printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach. Background Art

[0002] Lumbar fusion surgery has developed to treat neurological symptoms caused by lumbar degenerative diseases. Current surgical techniques have open and minimally invasive variations, allowing near-circumferential access to the lumbar spine. Over the past 20 years, the expansion of surgical tools and implants has, to a certain extent, promoted the increase in the rate of lumbar fusion surgery, among which the rate of lumbar revision has increased proportionally. During the operation, it is necessary to expand the surgical entrance with a retractor or dilator to avoid tissue, reveal the surgical range, and facilitate exploration and operation. The current retractor has the problem of requiring more steps to complete the expansion when expanding the surgical entrance, and in minimally invasive surgery, due to the small incision, the insertion of the retractor or dilator is also more troublesome. Therefore, the present application provides a 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach to meet the needs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach to solve the problem that the existing retractors are cumbersome to operate and use.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A 3D-printed titanium lumbar intervertebral retractor for minimally invasive transforaminal access includes a positioning pin with a hollow cone head slidably connected to its outer side. The hollow cone head has a positioning slot defined on its inner side and a bump fixedly connected to its outer side. The hollow cone head is connected to an expansion assembly that expands and limits the entrance to the surgical area.

[0006] Optionally, the expansion assembly includes a hole-expanding member sleeved on the outside of the protrusion, a limiting groove is provided on the inner side of the hole-expanding member, and the protrusion is slidably connected to the inner side of the limiting groove.

[0007] Optionally, the number of the reaming pieces is set to two, the two reaming pieces are arranged in a close-fitting shape, the inner walls of the two reaming pieces are respectively hinged with connecting rods, the two connecting rods are respectively fixedly connected to the two ends of the elastic piece, and the ends of the two connecting rods away from the reaming pieces are simultaneously sleeved with shaft columns.

[0008] Optionally, a retractor is slidably connected to the outer side of the hole expanding member, and a side connecting plate is fixedly connected to the outer side of the retractor.

[0009] Optionally, a transmission member is slidably connected to the interior of the side connecting plate, the transmission member is slidably connected to the interior of the retracting member, and one end of the transmission member is fixedly connected to an inserting rod member.

[0010] Optionally, the top end of the positioning needle is fixedly connected to a handle, the outer side of the positioning needle is fixedly connected to a water drop convex bead, and the inner side of the hollow cone head is provided with a limiting groove adapted to the water drop convex bead.

[0011] Optionally, one end of the side connecting plate is hinged with a movable rod, the outer side of the movable rod is sleeved with a shell, the interior of the shell is rotatably connected to a first screw, and the first screw is threadedly connected to the movable rod.

[0012] Optionally, one end of the first screw is fixedly connected to a rotating handle.

[0013] Optionally, a first handle is fixedly connected to one side of the shell, and a second handle is fixedly connected to one end of the first handle.

[0014] Optionally, a turntable is rotatably connected to one side of the shell, a second screw is threadedly connected to the inner side of the turntable, the second screw is slidably connected to the inside of the shell, one end of the second screw is fixedly connected to a resistance seat, one side of the resistance seat is fixedly connected to a positioning rod, and the positioning rod is slidably connected to the inside of the shell.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] In the above scheme, by setting up a hole-expanding piece and a retractor, when the retractor is used, it is positioned by inserting the positioning needle into the incision in the surgical area, and then the hole-expanding piece is sleeved on the outside of the handle, slid down to the outside of the positioning needle and inserted into the incision, thereby expanding the incision. The retractor is sleeved on the outside of the hole-expanding piece and slid downward into the incision to further expand the incision. When inserted into the incision, the center points of the retractors on both sides are aligned with the two ends of the incision, so that the retractor is matched with the hole-expanding piece and the incision, thereby facilitating the retractor to be inserted into the incision and reducing the difficulty of inserting the retractor into the incision.

[0017] By setting a first screw and a rotating handle, the first screws on both sides are rotated at the same time by rotating the rotating handle, thereby causing the movable rods on both sides to move outward at the same time, and then driving the retraction members on both sides to expand outward through the side connecting plates. At this time, the transmission member slides inside the side connecting plates. When the transmission member slides to the farthest distance inside the side connecting plates, the vertical section of the transmission member contacts the side connecting plates, and a limit is formed at this time. The movement of the side connecting plates can drive the transmission member to move, thereby causing the connecting rod to stretch, and at the same time the elastic member is deformed, causing the reaming members on both sides to expand outward, thereby realizing retraction of the incision and internal tissues. In this way, when retracting the incision, only the rotating handle needs to be turned to complete the multi-directional traction of the incision, reducing the operating steps and improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the invention.

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the 3D-printed titanium lumbar intervertebral retractor used for minimally invasive transforaminal approach;

[0020] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0021] Figure 3 Partial anatomical view of the 3D-printed titanium lumbar intervertebral retractor used for minimally invasive transforaminal approach;

[0022] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part B;

[0023] Figure 5 Schematic diagram of the three-dimensional structure of the bump;

[0024] Figure 6 A cross-sectional view of the local structure of a 3D-printed titanium lumbar intervertebral retractor used for minimally invasive transforaminal approach.

[0025] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of part D;

[0026] Figure 8 This is a schematic diagram of the top-down stereoscopic structure of the 3D-printed titanium lumbar intervertebral retractor used for minimally invasive transforaminal approach.

[0027] Reference numerals:

[0028] 1. Positioning needle; 2. Hollow cone head; 3. Bump; 4. Expanding member; 5. Limiting groove; 6. Pull-out member; 7. Connecting rod; 8. Elastic member; 9. Side connecting plate; 10. Transmission member; 11. Inserting rod member; 12. Handle; 13. Water drop bead; 14. Movable rod; 15. Housing; 16. First screw; 17. Turning handle; 18. First grip; 19. Second grip; 20. Turntable; 21. Second screw; 22. Contact seat; 23. Positioning rod; 24. Shaft column; 25. Positioning groove.

[0029] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0030] The following, combined with the accompanying drawings and specific embodiments, describes in detail a 3D-printed titanium lumbar intervertebral retractor for minimally invasive transforaminal access provided by the present invention. It is also noted that, for the sake of completeness, the following embodiments are best and preferred, and those skilled in the art may employ alternative implementations for known techniques. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0031] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0032] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0033] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0034] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0035] like Figures 1 to 4As shown, an embodiment of the present invention provides a 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach, including a positioning needle 1. The positioning needle 1 is a cylinder with a tapered bottom end. A hollow cone head 2 is slidably connected to the outer side of the positioning needle 1. The hollow cone head 2 is hollow conical, and the larger end is connected to the smaller end. The minimum inner diameter of the hollow cone head 2 is larger than the maximum outer diameter of the handle 12. A positioning groove 25 is provided on the inner side of the hollow cone head 2, and a bump 3 is fixedly connected to the outer side of the hollow cone head 2. The expansion component is connected to the hollow cone head 2, and the expansion component includes a reamer 4 sleeved on the outside of the protrusion 3. The reamer 4 is set in a semicircular arc shape, and the bottom end is adapted to the larger end of the hollow cone head 2. The number of reamer 4 is set to two, and the two reamer 4 are arranged in a fitting shape. The two reamer 4 that fit each other are combined into a hollow cylinder, and when connected to the hollow cone head 2, they can be inserted into the incision to stretch the incision and the internal tissue of the incision outward, thereby achieving the purpose of pulling the incision and the internal tissue apart. A limiting groove 5 is provided on the inner side of the reamer 4, and the limiting groove 5 is set in an L shape, which is divided into a horizontal slide groove and a vertical slide groove. The horizontal slide groove is connected to the vertical slide groove, and the inner contour of the horizontal slide groove is consistent with the protrusion 3 The vertical slide groove is adapted to the thickness of the protrusion 3 and the top is in an open state. The protrusion 3 is slidably connected to the inner side of the limiting groove 5, and the outer side of the hole expansion member 4 is slidably connected to the retractor 6. The retractor 6 has an arc-shaped outline as a whole, and the two sides and the bottom end of the retractor 6 are inclined inwardly to fit the hole expansion member 4, so that when the retractor 6 is sleeved on the outer wall of the hole expansion member 4, the two sides and the bottom end of the retractor 6 can transition to the hole expansion member 4, and then when in use, the bottom end of the retractor 6 can contact the edge of the incision opened by the hole expansion member 4, and as it continues to descend, it enters the interior of the incision, thereby expanding the incision and internal tissue again. The expansion component is used to expand and limit the entrance to the surgical area.

[0036] By setting the expansion piece 4 and the retractor 6, in the initial state, the positioning needle 1, the hollow cone head 2 and the retractor 6 are separated, wherein the hollow cone head 2 is combined with the protrusion 3. When the retractor is used, the independent positioning needle 1 is inserted into the incision of the surgical area for positioning, and then the expansion piece 4 is sleeved on the outside of the handle 12 and slid downward on the outside of the positioning needle 1, so that the hollow cone head 2 contacts the surgical incision and extends into the interior of the incision, thereby expanding the incision. It should be noted that the shaft columns 24 on both sides need to be aligned with the protruding side of the handle 12, that is, Figure 2The state shown facilitates the subsequent removal of the hollow cone head 2. After the incision is expanded by the reaming member 4, the retractor 6 is sleeved on the outside of the reaming member 4 and slid downward into the incision to further expand the incision. Since the retractors 6 on both sides are arranged in a semi-arc shape, when sleeved on the outside of the reaming member 4, the corners of the retractors 6 are arranged in a smooth transition shape toward the reaming member 4. When inserted into the incision, the center points of the retractors 6 on both sides are aligned with the two ends of the incision, so that the retractors 6, the reaming member 4 and the incision are matched, thereby facilitating the insertion of the retractor 6 into the incision and reducing the difficulty of inserting the retractor 6 into the incision. After the retractor 6 is inserted into the appropriate position of the incision, the retractor 6 can stop sliding downward, at which time the initial expansion of the surgical incision is completed.

[0037] like Figure 2 As shown, the inner walls of the two expansion members 4 are hinged with connecting rods 7 respectively, and the two connecting rods 7 are fixedly connected to the two ends of the elastic member 8 respectively. The elasticity of the elastic member 8 limits the connecting rods 7 on both sides, so that the connecting rods 7 on both sides are kept in a contracted state, so that the expansion members 4 on both sides contact each other, and the ends of the two connecting rods 7 away from the expansion member 4 are simultaneously sleeved with a shaft column 24, and the shaft column 24 is hollow. The shaft column 24 is used to make one end of the connecting rods 7 on both sides located at the same center point, so that they can rotate about the center point of the shaft column 24. The shaft column 24 is used to limit one end of the connecting rods 7 on both sides, so that the connecting rods 7 on both sides are combined into connecting rods, and at the same time, the elastic member 8 is used to make them contract, so that the expansion members 4 on both sides can fit each other. At the same time, the inner walls of the expansion members 4 on both sides are provided with two groups of connecting rods (connecting rods 7, elastic member 8, shaft column 24) formed by the above combination, and the other group of connecting rods is set Figure 2 The opposing positions of the connecting rods shown in the figure can achieve a stable fit of the reaming members 4 on both sides. When the shaft columns 24 on both sides are displaced outward at the same time, the two sets of connecting rods will be stretched at the same time, thereby enabling the reaming members 4 on both sides to expand outward. The outside of the retractor 6 is fixedly connected to a side connecting plate 9, and an L-shaped sliding groove is provided inside the side connecting plate 9, wherein the contour of the sliding groove on the larger side is adapted to the outer contour of the horizontal section of the transmission member 10, and the width of the sliding groove on the smaller side is greater than the width of the vertical section of the transmission member 10. The inside of the side connecting plate 9 is slidably connected to the transmission member 10, and the transmission member 10 is L-shaped (such as Figure 8As described above, it is divided into a horizontal section and a vertical section. The horizontal section extends into the interior of the retraction member 6 and is connected to the plug member 11. The vertical section is installed in the interior of the side connecting plate 9. When the plug member 11 is plugged into the shaft column 24, if the handle 17 is rotated at this time, the first screw 16 is rotated so that the movable rod 14 slides to one side along the first screw 16 under the limit of the shell 15, thereby driving the side connecting plate 9 and the retraction member 6 to move horizontally to one side, and when the vertical section is limited, the side connecting plate 9 can simultaneously drive the vertical section to slide horizontally outward. The transmission member 10 is slidably connected to the inside of the retraction member 6. When the vertical section of the transmission member 10 is driven by the side connecting plate 9, the transmission member 10 slides horizontally inside the retraction member 6 at the same time. One end of the transmission member 10 is fixedly connected to the plug member 11. The plug member 11 includes a large column and a small column. The large column is connected to the transmission member 10. The outer diameter of the large column is larger than the outer diameter of the shaft column 24. The small column is arranged at the bottom of the large column. The outer diameter of the small column is smaller than the inner diameter of the shaft column 24, so that the small column can be inserted into the inner side of the shaft column 24.

[0038] By setting the connecting rod 7 and the side connecting plate 9, when the distraction piece 6 matches the incision and extends into the incision, it is necessary to ensure that the center point of the insertion rod piece 11 is aligned with the center point of the shaft column 24, so that the insertion rod piece 11 can be inserted into the inner side of the shaft column 24. After the insertion rod piece 11 is inserted into the inner side of the shaft column 24, the distraction piece 6 can stop sliding downward, and the distraction piece 6 and the hole expansion piece 4 are assembled. Since the retractor 6 has entered the interior of the incision at this time, the retractor 6 is driven by the connecting plate 9 to move outward, thereby expanding the incision and realizing the retraction of the incision and internal tissues. At the same time, after the incision and internal tissues are retracted to a certain extent, at this time, the distance between the retractors 6 on both sides can make the hole expander 4 slide outward on the inner side of the retractors 6 on both sides, and at this time the side connecting plate 9 can limit the transmission member 10, so that the rod member 11 can drive the shaft column 24 to slide to the outside of the hole expander 4, prompting the connecting rods 7 on both sides to stretch, so that the hole expanders 4 on both sides expand outward, thereby completing the complete retraction of the incision and internal tissues, so that the surgical range can be fully exposed, and the hole expanders 4 on both sides are used to fill the gap between the retractors 6 on both sides, thereby avoiding the small contact area with the incision and internal tissues, resulting in some tissues not being pulled and protruding, blocking the surgical field of view.

[0039] like Figure 2 and Figure 5As shown, the top of the positioning needle 1 is fixedly connected to a handle 12, which enables the doctor to better grasp it, thereby facilitating the disassembly and removal of the positioning needle 1 and the hollow cone head 2. The handle 12 is in the shape of a flat sheet, and the two sides protruding outward are aligned with the shaft columns 24 on both sides, so that the reamer 4 can be positioned. The outer side of the positioning needle 1 is fixedly connected to a water droplet bead 13, which is set in a smooth water droplet shape, so that when the positioning needle 1 is inserted into the incision, the water droplet bead 13 will not affect the incision and the internal tissue. At the same time, the top of the water droplet bead 13 is set in a flat shape, so that when it enters the positioning groove 25 of the hollow cone head 2, it can fit with it to achieve a mutual limiting effect. The inner side of the hollow cone head 2 is provided with a positioning groove 25 that is compatible with the water droplet bead 13.

[0040] By providing the handle 12 and the water-drop convex bead 13, when the reamer 4 is sleeved on the outside of the positioning needle 1, the shaft column 24 is aligned with the two outwardly protruding sides of the handle 12, thereby sleeved on the outside of the reamer 4 by the retractor 6, and the small column of the inserting rod 11 is assembled with the shaft column 24. Before the incision is retracted, the handle 12 is pulled upward to allow the water-drop convex bead 13 to enter the limit groove of the hollow cone head 2. The reamer 4 is manually fixed, and the handle 12 is rotated clockwise to cause the water-drop convex bead 13 to drive the hollow cone head 2 to rotate. The protrusion 3 is initially located in the horizontal groove of the limit groove 5. As the hollow cone head 2 moves, it gradually moves toward the vertical groove and finally enters the vertical groove. Since the top of the vertical chute is in an open state, the handle 12 is pulled upward to make the protrusion 3 slide upward along the vertical chute of the limiting groove 5. Since the top of the vertical chute is in an open state, when the protrusion 3 slides out of the vertical chute, it can separate from the limiting groove 5. At this time, the protrusion 3 loses the limit of the limiting groove 5. After the protrusion 3 loses the limit, the hollow cone head 2 can be separated from the reaming pieces 4 on both sides. By pulling up the handle 12, the positioning needle 1 and the hollow cone head 2 are removed, thereby completing the simultaneous disassembly of the positioning needle 1 and the hollow cone head 2. By removing the hollow cone head 2, the bottom end of the reaming piece 4 is exposed, thereby improving the visual range. After that, the reaming pieces 4 on both sides can be expanded outwards to increase the retraction range.

[0041] like Figure 6 and Figure 8As shown, the side connecting plate 9 is hingedly connected to a movable rod 14 at one end away from the retractor 6. The side connecting plate 9 is L-shaped, and the movable rod 14 is hinged, so that the movable rod 14 can be flipped upward to a comfortable operating angle according to actual conditions. The outer side of the movable rod 14 is sleeved with a shell 15. The shell 15 is a hollow structure, and a groove for the movable rod 14 to slide is opened on the side close to the side connecting plate 9. The surface of the shell 15 is opened with a long hole, through which the position of the movable rod 14 can be observed, so as to judge the distance that the movable rod 14 can continue to slide in the shell 15. The interior of the shell 15 is rotatably connected to a first screw 16. The first screw 16 is provided in two, and the thread rotation directions of the two first screws 16 are opposite. One end of the first screw 16 is inserted into the movable rod 14, and the movable rod 14 is provided with a thread groove adapted to the first screw 16. When the first screw 16 rotates, the movable rod 14 can slide to one end along the first screw 16 under the limit of the shell 15. The two first screws 16 are fixedly connected to the two ends of the rotating handle 17 respectively. One side of the shell 15 is fixedly connected to the first handle 18, and one end of the first handle 18 is fixedly connected to the second handle 19.

[0042] The insert rod 11 is inserted into the inner side of the shaft column 24, and the distraction piece 6 and the hole expansion piece 4 are assembled. By setting the first screw 16 and the rotating handle 17, when the hole expansion piece 4 and the distraction piece 6 on both sides are expanded outward, thereby distracting the incision, the first screws 16 on both sides are rotated at the same time by rotating the rotating handle 17, and under the limit of the housing 15, the movable rods 14 on both sides are simultaneously displaced outward along the first screws 16 on both sides. When the movable rods 14 are displaced, the side connecting plates 9 are driven to displace synchronously, and then the side connecting plates 9 are displaced. The connecting plate 9 drives the retractors 6 on both sides to slide outward, thereby expanding the incision and internal tissue. At this time, the side connecting plate 9 slides on the outside of the transmission member 10, and the reamer members 4 on both sides remain in contact with each other under the action of the elastic members 8 on both sides. When the side connecting plate 9 slides to contact the vertical section of the transmission member 10, the movement of the side connecting plate 9 can drive the transmission member 10 to move, thereby causing the shaft column 24 to be forced to move outward, causing the reamer members 4 on both sides to expand outward, thereby achieving retraction of the incision and internal tissue. The deformation of the elastic member 8 can cause the connecting rod 7 to return to a contracted state after it is no longer subjected to outward force, thereby restoring the reamer members 4 on both sides to fit together. When retracting the incision, it is only necessary to turn the handle 17 to complete the multi-directional traction of the incision, reducing the number of operating steps and improving the convenience of use. And because the movable rod 14 can be flipped upward, it can be flipped to a comfortable angle during operation for easy operation. A first handle 18 and a second handle 19 are provided on the shell 15, which can have two holding methods during operation. The holding method is that the ring finger and the little finger are located on the outside of the first handle 18 or the second handle 19, and the other three fingers are placed on the outside of the shell 15. By flexibly selecting the first handle 18 and the second handle 19, the holding method can be changed, thereby adapting to a variety of hand shapes and holding habits, and increasing comfort during operation.

[0043] like Figure 7 As shown, the shell 15 is rotatably connected to a turntable 20 on one side away from the second handle 19, and a second screw 21 is provided on the turntable 20. One end of the second screw 21 is connected to the internal thread of the shell 15, and the other end of the second screw 21 is fixedly connected to a resistance seat 22. One side of the resistance seat 22 is fixedly connected to a positioning rod 23. The positioning rod 23 can limit the resistance seat 22 to keep the resistance seat 22 sliding to avoid rotation. The positioning rod 23 is horizontally slidably connected to the inside of the shell 15.

[0044] By setting the interference seat 22, after the operation is completed, the shell 15 is flipped downward to make the movable rod 14 rotate downward ninety degrees with the connection with the connecting plate 9 as the center, so that the movable rod 14 is perpendicular to the connecting plate 9, and the turntable 20 is rotated to make the second screw 21 drive the interference seat 22 to descend. After the interference seat 22 contacts the isolation pad and other objects on the surface of the patient's body, the movable rod 14 can be kept in the current state to avoid the shell 15 being too heavy, causing the expansion piece 4 and the retractor 6 to tilt to one side and affect the normal progress of the operation.

[0045] The workflow of the technical solution provided by the present invention is as follows:

[0046] Insert the positioning needle 1 into the incision of the surgical area for positioning, then sleeve the reamer 4 on the outside of the handle 12 and slide it downward to the outside of the positioning needle 1, so that the hollow cone head 2 contacts the surgical incision and enters the interior of the incision, thereby expanding the incision. It should be noted that the shaft columns 24 on both sides must be aligned with the protruding sides of the handle 12, that is, Figure 8In the state shown, the retractor 6 is sleeved on the outside of the reamer 4 so that the center points of the retractors 6 on both sides are aligned with the two ends of the surgical incision, so that the retractor 6 is matched with the reamer 4 and the surgical incision. Since the size of the reamer 4 is smaller than the size of the surgical incision, when the reamer 4 enters the incision, it stretches the incision, and the reamer 4 does not completely fit with the two ends of the incision. At this time, the retractor 6 is lowered and inserted into the incision through the two ends of the incision. The shape of the retractor 6 can reduce the contact area with the incision and avoid contact with the center position of the incision, so that it does not need to contact the incision position that is in close contact with the reamer 4, thereby facilitating the retractor 6 to be inserted into the surgical incision and reducing the difficulty of the retractor 6 to be inserted into the surgical incision. After the insertion rod 11 is inserted into the inner side of the shaft column 24, the retractor 6 stops sliding downward. At this time, the retractor 6 and the reamer 4 are assembled. The incision and internal tissue are stretched open by the retractor 6 and the reamer 4, thereby completing the initial expansion of the surgical incision. By pulling the handle 12 upward, the water drop convex bead 13 can enter the positioning groove 25 of the hollow cone head 2. At this time, by manually fixing the reamer 4 and turning the handle 12 clockwise, the water drop convex bead 13 can drive the hollow cone head 2 is rotated, the protrusion 3 slides on the inner side of the limiting groove 5 and stops at the vertical groove. At this time, the handle 12 is pulled upward. Since the top of the vertical groove is in an open state, the protrusion 3 can slide out along the vertical groove of the limiting groove 5, thereby separating the hollow cone head 2 from the reaming members 4 on both sides. At this time, the positioning needle 1 and the hollow cone head 2 can be taken out at the same time, thereby completing the simultaneous disassembly of the positioning needle 1 and the hollow cone head 2. By taking out the hollow cone head 2, the visual range is improved. By rotating the handle 17, the first screws 16 on both sides rotate at the same time, thereby causing the movable rods 14 on both sides to move outward at the same time, and then driving the retractors 6 on both sides to expand outward through the side connecting plates 9. At this time, the transmission member 10 slides inside the side connecting plates 9, and the hole-expanding members 4 on both sides remain in a fitted state under the action of the elastic members 8 on both sides. When the transmission member 10 slides to the farthest distance inside the side connecting plates 9, the vertical section of the transmission member 10 contacts the side connecting plates 9, and a limit is formed at this time. The movement of the side connecting plates 9 can drive the transmission member 10 to move, thereby causing the connecting rod 7 to stretch, and at the same time the elastic member 8 is deformed, causing the hole-expanding members 4 on both sides to expand outward, thereby realizing retraction of the incision and internal tissues, reducing the operating steps and improving the convenience of use. In addition, the present application can use 3D printing technology to manufacture the hole-expanding member 4 and the retractor 6 using titanium alloy as raw material, so that they can fully match the surgical plan and improve the success rate of the operation.

[0047] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. While specific details are described in detail in the preferred embodiments of the present invention to provide a thorough understanding of the present invention, those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach, characterized in that: It includes a positioning needle, the outer side of which is slidably connected to a hollow cone head, the inner side of which is provided with a positioning groove, the outer side of which is fixedly connected to a bump, and the hollow cone head is connected to an expansion component for expanding and limiting the entrance to the surgical area; The expansion assembly includes a hole expansion member sleeved on the outside of the protrusion; The number of the reaming members is set to two, and the two reaming members are arranged in a close-fitting shape. The inner walls of the two reaming members are respectively hinged with connecting rods, and the two connecting rods are respectively fixedly connected to the two ends of the elastic member. The ends of the two connecting rods away from the reaming members are simultaneously sleeved with shaft columns; the elasticity of the elastic member limits the connecting rods on both sides, so that the connecting rods on both sides are kept in a contracted state, so that the reaming members on both sides contact each other; The outer side of the hole expansion member is slidably connected to a retractor, and the outer side of the retractor is fixedly connected to a side connecting plate; The side connecting plate is internally slidably connected to a transmission member, the transmission member is slidably connected to the inside of the retractor, and one end of the transmission member is fixedly connected to an insertion rod member; One end of the side connecting plate is hinged with a movable rod, the outer side of the movable rod is sleeved with a shell, the interior of the shell is rotatably connected with a first screw rod, and the first screw rod is arranged in a threaded connection with the movable rod.

2. The 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach according to claim 1, characterized in that: A limiting groove is provided on the inner side of the hole expanding member, and the protrusion is slidably connected to the inner side of the limiting groove.

3. The 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach according to claim 1, characterized in that: The top end of the positioning needle is fixedly connected with a handle, the outer side of the positioning needle is fixedly connected with a water drop convex bead, and the inner side of the hollow cone head is provided with a limiting groove adapted to the water drop convex bead.

4. The 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach according to claim 1, characterized in that: One end of the first screw is fixedly connected to a rotating handle.

5. The 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach according to claim 1, characterized in that: A first handle is fixedly connected to one side of the shell, and a second handle is fixedly connected to one end of the first handle.

6. The 3D printed titanium lumbar intervertebral retractor for minimally invasive transforaminal approach according to claim 1, characterized in that: A turntable is rotatably connected to one side of the shell, a second screw is threadedly connected to the inner side of the turntable, the second screw is slidably connected to the inside of the shell, one end of the second screw is fixedly connected to a resistance seat, one side of the resistance seat is fixedly connected to a positioning rod, and the positioning rod is slidably connected to the inside of the shell.

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