Expandable scraping device for tissue in intervertebral space under endoscope

Abstract

The invention discloses an expandable scraping device for tissues in intervertebral space under an endoscope, and belongs to the technical field of spine endoscopes. The upper outer cylinder sleeves the outer side of the working sleeve, and a gap is formed between the upper outer cylinder and the working sleeve; the multi-petal lower outer cylinder surrounds the outer side of the working sleeve and is located on the lower side of the upper outer cylinder, the lower outer cylinder is hinged to the upper outer cylinder through a telescopic rod, and a gap is formed between the lower outer cylinder and the working sleeve; the plurality of expansion mechanisms are arranged corresponding to the plurality of lower outer cylinders, are arranged between the working sleeve and the corresponding lower outer cylinders, and are used for changing the distance between the working sleeve and the lower outer cylinders; the scraping structure is arranged on the side face of the lower outer cylinder and used for scraping cartilage end plates and nucleus pulposus tissue in the intervertebral space. The scraping structure is arranged on the lower outer cylinder, tissue in the intervertebral space is scraped, efficiency is high, and consumed time is short.

Description

Technical Field

[0001] The present invention belongs to the technical field of spinal endoscopy, and in particular relates to an expandable scraping device for tissue in the intervertebral space under endoscopy. Background Art

[0002] During spinal endoscopic surgery, the surrounding soft tissue is pushed aside by the working cannula to further expose the surgical field for endoscopic operation. The instrument channel, camera system, light source system and water inlet and outlet channels of the spinal endoscope are long rod-shaped coaxial structures. During operation, the spinal endoscope tube is extended along the working cannula to the tube opening. During the entire operation, the spinal endoscope needs to use the working cannula as a fulcrum and protective sheath to complete the safe and precise operation of the endoscopic instruments. However, in current operations, the working cannula is hand-held by the surgeon or assistant, especially the surgeon. An operation often takes 1-2 hours, or even longer. During the entire endoscopic precise operation, the control of the working cannula and avoiding the channel being too deep to damage the nerve structure are extremely challenging to the physical strength and endurance of both the surgeon and the assistant. Excessive fatigue can easily cause the working cannula to slip out of control to the deep surface, posing a potential huge risk to the spinal cord and nerve roots in front of the tube opening.

[0003] During fusion and internal fixation surgery to treat spinal disorders, tissue within the intervertebral space must first be removed with a curette, including the nucleus pulposus of the intervertebral disc and the cartilage endplates on both sides, until punctate bleeding appears on the vertebral bone surface. Autologous bone and fusion devices (cages) are then inserted. Due to the small diameter of the endoscope channel, a curette with a larger working surface cannot be used, resulting in inefficient and time-consuming tissue removal within the intervertebral space. Summary of the Invention

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

[0005] An expandable scraping device for endoscopically removing tissue in an intervertebral space, comprising:

[0006] Working casing;

[0007] an upper outer cylinder, the upper outer cylinder being rotatably sleeved on the outer side of the working sleeve, with a gap being provided between the upper outer cylinder and the working sleeve;

[0008] A multi-petal lower outer cylinder, the multi-petal lower outer cylinder surrounds the outside of the working sleeve and is located on the lower side of the upper outer cylinder. The lower outer cylinder and the upper outer cylinder are hingedly connected by a telescopic rod, and a gap is provided between the lower outer cylinder and the working sleeve;

[0009] A plurality of expansion mechanisms, each of which is provided corresponding to the multi-petal lower outer tube and is provided between the working sleeve and the corresponding lower outer tube, for changing the distance between the working sleeve and the lower outer tube;

[0010] The scraping structure is arranged on the side of the lower outer tube and is used to scrape the cartilage end plates and nucleus pulposus tissue in the intervertebral space.

[0011] Furthermore, the working sleeve and the corresponding parts of the lower outer cylinder are provided with a first external thread and a second external thread, the first external thread and the second external thread have opposite rotation directions, and the working sleeve is provided with a first movable ring and a second movable ring, the first movable ring is provided with a first internal thread that cooperates with the first external thread, and the second movable ring is provided with a second internal thread that cooperates with the second external thread.

[0012] Furthermore, each of the expansion mechanisms comprises:

[0013] a first connecting rod, wherein a first end of the first connecting rod is hingedly connected to the first movable ring;

[0014] a second connecting rod, a first end of the second connecting rod being hinged to the second movable ring;

[0015] A fixed block is fixedly connected to the corresponding lower outer cylinder, and the second end of the first connecting rod and the second end of the second connecting rod are both hinged to the fixed block.

[0016] Furthermore, the multi-petal lower outer cylinder includes three petals or four petals, and three or four of the plurality of expansion mechanisms are correspondingly provided.

[0017] Furthermore, the scraping structure includes:

[0018] A plurality of through hole groups, wherein the plurality of through hole groups are arranged at intervals along the length direction of the lower outer cylinder, and the plurality of through holes in each through hole group are arranged at intervals along the circumference direction of the lower outer cylinder;

[0019] Multiple scrapers are arranged corresponding to multiple through holes, and the bottom edges of the multiple scrapers are connected to the opening edges of the corresponding through holes. The enclosed space formed by the outer surface of the scraper and the wall of the lower outer cylinder is opened, and the openings of the multiple scrapers are all located on the same side.

[0020] Furthermore, two adjacent groups of through-holes are arranged in a staggered manner.

[0021] Furthermore, the through hole is a semicircular or rectangular hole.

[0022] Beneficial effects: The present invention provides a scraping structure on the lower outer cylinder to scrape the tissue in the intervertebral space, which is highly efficient and time-saving, and is a good helper for current endoscopic spinal fusion surgeons.

[0023] The present invention changes the distance between the lower outer cylinder and the working sleeve according to different intervertebral spaces, so that the scraping structure can always contact the upper and lower cartilage end plates of the intervertebral space, thereby improving the adaptability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of an expandable scraper device for endoscopic intervertebral space tissue according to the present invention when the lower outer cylinder is not expanded;

[0025] Figure 2 This is a schematic diagram of the lower outer cylinder of an expandable scraper device for endoscopic intervertebral space tissue according to the present invention when expanded;

[0026] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged view at point A in the middle;

[0027] Figure 4 This is a bottom view schematic diagram of the present invention in an unopened state;

[0028] Figure 5 It is a bottom view schematic diagram of the present invention in the opened state.

[0029] Among them, 1. Spinal endoscope; 2. Working sleeve; 3. Upper outer cylinder; 4. Lower outer cylinder; 5. Scraper; 6. First outer thread; 7. Second outer thread; 8. First movable ring; 9. Second movable ring; 10. First connecting rod; 11. Second connecting rod; 12. Fixed block; 13. Telescopic rod; 14. Handle. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0033] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Example 1

[0036] refer to Figure 1-Figure 5 , an expandable scraping device for endoscopic intervertebral space tissue, comprising:

[0037] Working casing 2;

[0038] The upper outer cylinder 3 is rotatably sleeved on the outer side of the working sleeve 2, with a gap being provided between the upper outer cylinder 3 and the working sleeve 2;

[0039] In specific implementation, an annular groove is provided on the upper outer cylinder 3 , and a convex block corresponding to the annular groove is provided on the working sleeve 2 , so that the upper outer cylinder 3 and the working sleeve 2 will not move up and down.

[0040] The multi-petal lower outer cylinder 4 surrounds the outside of the working sleeve 2 and is located on the lower side of the upper outer cylinder 3. The lower outer cylinder 4 and the upper outer cylinder 3 are hingedly connected by a telescopic rod 13. A gap is provided between the lower outer cylinder 4 and the working sleeve 2.

[0041] Multiple expansion mechanisms are provided corresponding to the multi-petal lower outer tube 4 and are provided between the working sleeve 2 and the corresponding lower outer tube 4 to change the distance between the working sleeve 2 and the lower outer tube 4;

[0042] The scraping structure is arranged on the side surface of the lower outer tube 4 and is used to scrape the cartilage end plates and nucleus pulposus tissue in the intervertebral space.

[0043] The present invention provides a scraping structure on the lower outer cylinder to scrape the tissue in the intervertebral space, which is highly efficient and time-saving.

[0044] In this embodiment, the corresponding parts of the working sleeve 2 and the lower outer tube 4 are provided with a first external thread 6 and a second external thread 7, and the first external thread 6 and the second external thread 7 have opposite rotation directions. The working sleeve 2 is provided with a first movable ring 8 and a second movable ring 9. The first movable ring 8 is provided with a first internal thread that cooperates with the first external thread 6, and the second movable ring 9 is provided with a second internal thread that cooperates with the second external thread 7.

[0045] In this embodiment, each expansion mechanism includes:

[0046] a first connecting rod 10, a first end of the first connecting rod 10 being hinged to the first movable ring 8;

[0047] A second connecting rod 11, a first end of the second connecting rod 11 is hinged to the second movable ring 9;

[0048] The fixing block 12 is fixedly connected to the corresponding lower outer cylinder 4 , and the second end of the first connecting rod 10 and the second end of the second connecting rod 11 are both hinged to the fixing block 12 .

[0049] In this embodiment, one end of the working sleeve 2 is provided with two handles 14 symmetrically arranged at 180°.

[0050] During specific implementation, according to different intervertebral disc spaces, the medical staff fixes the upper outer tube 3 with one hand and rotates the handle 14 of the working sleeve 2 with the other hand. By rotating the handle 14 of the working sleeve 2 forward or reversely, the first movable ring 8 and the second movable ring 9 are driven to move closer or farther away, thereby causing the lower outer tube 4 to expand outward or retract inward, thereby changing the distance between the lower outer tube and the working sleeve, so that the scraping structure can always contact the upper and lower cartilage end plates of the intervertebral disc space, thereby improving the adaptability of the device.

[0051] Preferably, the length of the lower outer cylinder 4 is about 40 mm.

[0052] In this embodiment, the multi-petal lower outer cylinder 4 includes three petals or four petals, and three or four expansion mechanisms are correspondingly provided.

[0053] In this embodiment, the scraping structure includes:

[0054] Multiple through hole groups, the multiple through hole groups are spaced apart along the length direction of the lower outer tube 4, and the multiple through holes in each through hole group are spaced apart along the circumference direction of the lower outer tube 4;

[0055] Multiple scrapers 5 are arranged corresponding to the multiple through holes, and the bottom edges of the multiple scrapers 5 are connected to the opening edges of the corresponding through holes. The enclosed space formed by the outer surface of the scraper 5 and the wall of the lower outer tube 4 is formed into an opening, and the openings of the multiple scrapers 5 are all located on the same side.

[0056] During specific implementation, the opening is arc-shaped or polygonal.

[0057] In this embodiment, two adjacent groups of through holes are arranged in a staggered manner, so that the scraping device can perform all-round treatment on the intervertebral space when rotating.

[0058] In this embodiment, the distance between two adjacent through hole groups is 2-3 mm.

[0059] In this embodiment, the distance between two adjacent through holes in each through hole group is 1.5-3 mm.

[0060] In this embodiment, the through hole is a semicircular or rectangular hole.

[0061] In this embodiment, the diameter or side length of each through hole is 2-4 mm.

[0062] In this embodiment, the outer diameter of the endoscope outer sleeve generally has three diameter designs: 7.5 mm is matched with 3.7 / 6.3 mm endoscopes; 8.5 mm is matched with 4.3 / 7.0 mm endoscopes; and 11.5 mm is matched with 10.0 / 7.1 endoscopes.

[0063] In this embodiment, after combining with different opening heights, the lower outer tube 4 of each spinal endoscope 1 can have different specifications, and the intervertebral space can be expanded step by step and the intervertebral tissue can be scraped. The spinal endoscope 1 has an original outer diameter of the lower outer tube 4 plus the height of the opening, and the outer diameter is 8.5mm to 15.5mm, which can meet the treatment requirements of intervertebral spaces of different heights.

[0064] During specific implementation, when fusing the intervertebral space, it is necessary to scrape off the cartilage end plates and nucleus pulposus tissue inside the space. In order to facilitate the operation under the spinal endoscope 1, multiple scrapers are provided on the surface of the lower outer tube 4. The working sleeve 2 and the lower outer tube 4 scrape off the tissue in the space through the scraping structure while protecting the spinal endoscope 1.

[0065] During specific implementation, in order to place the device minimally invasively into the intervertebral space and perform subsequent tissue scraping steps, it is inserted into the intervertebral space through an endoscope in an unexpanded state. When inserted through the skin and muscle soft tissue, it is rotated in the opposite direction of the opening to avoid damage to the tissue. The working sleeve is then rotated to expand the three-leaf or four-leaf flap of the device so that it can contact the upper and lower cartilage end plates of the intervertebral space. When scraping the space, the device is rotated in the direction of the opening to scrape the tissue in the intervertebral space.

[0066] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An expandable scraping device for endoscopic intervertebral space tissue, characterized in that: include: Working casing; an upper outer cylinder, the upper outer cylinder being rotatably sleeved on the outer side of the working sleeve, with a gap being provided between the upper outer cylinder and the working sleeve; A multi-petal lower outer cylinder, the multi-petal lower outer cylinder surrounds the outside of the working sleeve and is located on the lower side of the upper outer cylinder. The lower outer cylinder and the upper outer cylinder are hingedly connected by a telescopic rod, and a gap is provided between the lower outer cylinder and the working sleeve; A plurality of expansion mechanisms, each of which is provided corresponding to the multi-petal lower outer tube and is provided between the working sleeve and the corresponding lower outer tube, for changing the distance between the working sleeve and the lower outer tube; The scraping structure is arranged on the side of the lower outer tube and is used to scrape the cartilage end plates and nucleus pulposus tissue in the intervertebral space.

2. The expandable scraping device for endoscopic intervertebral space tissue according to claim 1, characterized in that: The working sleeve and the corresponding parts of the lower outer cylinder are provided with a first external thread and a second external thread, and the first external thread and the second external thread have opposite rotation directions. The working sleeve is provided with a first movable ring and a second movable ring, and the first movable ring is provided with a first internal thread that cooperates with the first external thread, and the second movable ring is provided with a second internal thread that cooperates with the second external thread.

3. The expandable scraping device for endoscopic intervertebral space tissue according to claim 2, characterized in that: Each of the expansion mechanisms comprises: a first connecting rod, wherein a first end of the first connecting rod is hingedly connected to the first movable ring; a second connecting rod, a first end of the second connecting rod being hinged to the second movable ring; A fixed block is fixedly connected to the corresponding lower outer cylinder, and the second end of the first connecting rod and the second end of the second connecting rod are both hinged to the fixed block.

4. The expandable scraping device for endoscopic intervertebral space tissue according to claim 1, characterized in that: The multi-petal lower outer tube includes three petals or four petals, and three or four of the plurality of expansion mechanisms are correspondingly provided.

5. The expandable scraping device for endoscopic intervertebral space tissue according to claim 1, characterized in that: The scraping structure comprises: A plurality of through hole groups, wherein the plurality of through hole groups are arranged at intervals along the length direction of the lower outer cylinder, and the plurality of through holes in each through hole group are arranged at intervals along the circumference direction of the lower outer cylinder; Multiple scrapers are arranged corresponding to multiple through holes, and the bottom edges of the multiple scrapers are connected to the opening edges of the corresponding through holes. The enclosed space formed by the outer surface of the scraper and the wall of the lower outer cylinder is opened, and the openings of the multiple scrapers are all located on the same side.

6. The expandable scraping device for endoscopic intervertebral space tissue according to claim 5, characterized in that: Two adjacent groups of through-holes are arranged in a staggered manner.

7. The expandable scraping device for endoscopic intervertebral space tissue according to claim 6, characterized in that: The through hole is a semicircular or rectangular hole.

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