Working sheath device

Abstract

The utility model provides a working sheath device which comprises a working sheath, a first fixing component and a second fixing component, the working sheath comprises an outer-layer sheath tube and an inner-layer sheath tube, the inner-layer sheath tube is arranged in the outer-layer sheath tube, and a sheath tube head is arranged at one end of the inner-layer sheath tube; the first fixing part is matched with the inner-layer sheathing canal, and the first fixing part enters the inner-layer sheathing canal and is used for fixing the nerve navigation rod and the nerve endoscope; and the second fixing part is matched with the outer-layer sheathing canal, enters the outer-layer sheathing canal and is used for fixing the neuroendoscope. According to the working sheath device, the first fixing part is arranged, the first fixing part is arranged in the inner sheath tube, and before puncture, the first fixing part is combined with the nerve navigation rod and the nerve endoscope, so that the working sheath can perform puncture more accurately.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically to a working sheath device. Background Technology

[0002] With the development of neuroendoscopic equipment and technology, neuroendoscopic techniques have been widely applied in neurosurgery, covering all aspects of the field. Because neuroendoscopy overcomes many blind spots inherent in ordinary microscopes, it effectively improves deep light attenuation, allows for multi-angle and close-up observation, making surgeries more precise and minimizing damage to surrounding brain tissue structures, thereby achieving the best therapeutic effect.

[0003] In surgical treatments, accurate puncture of the lesion site or establishment of a surgical channel is required, such as in brain tumor or cerebral hemorrhage surgery, and spinal surgery. These surgeries necessitate precise puncture to reach the surgical site to ensure success. Currently, most surgical channels in clinical practice are simply sheath channels. Surgeons rely on experience or the guidance of a neuronavigation rod to determine the location and direction before puncture. This method cannot accurately puncture the target location of the hematoma, nor can it maximize the protection of brain tissue and cerebral blood vessels. Furthermore, due to individual differences in patient anatomy, neuronavigation may overestimate or underestimate the surgical area in some complex cases, thus affecting surgical accuracy. Neuronavigation technology relies on preoperative imaging data (such as MRI or CT) to locate the surgical or treatment target. However, due to individual differences in anatomical structure, including variations in neural pathways and surrounding structures, if the preoperative imaging data does not fully reflect these anatomical variations, navigation accuracy may be limited. Utility Model Content

[0004] This application is made to address the aforementioned problems. According to one aspect of this application, a working sheath device is provided, comprising a working sheath, a first fixing member, and a second fixing member:

[0005] The working sheath includes an outer sheath tube and an inner sheath tube, the inner sheath tube being disposed inside the outer sheath tube, and a sheath tube head being provided at one end of the inner sheath tube;

[0006] The first fixation component matches the inner sheath and enters the inner sheath to fix the neuronavigation rod and neuroendoscopy.

[0007] The second fixation component matches the outer sheath and enters the outer sheath to fix the neuroendoscopy.

[0008] In one embodiment of this application, the first fixing component is provided with a first hole and a second hole:

[0009] The first hole is located at the center of the first fixing component, and the first hole is used to place the neural navigation rod;

[0010] The second hole is located off-center from the first fixing component, and the second hole is used to place a neuroendoscopy.

[0011] In one embodiment of this application, a third hole is provided inside the second fixing component:

[0012] The third hole is located off-center from the second fixing component, and the third hole is used to place a neuroendoscopy.

[0013] In one embodiment of this application, a first threaded structure is provided on the inner wall of the inner sheath at the end away from the sheath head;

[0014] The first fixing component enters the inner sheath tube away from the head of the sheath tube by cooperating with the first threaded structure.

[0015] In one embodiment of this application, a second threaded structure is provided on the inner wall of the outer sheath at the end away from the sheath head;

[0016] The second fixing component enters the outer sheath at the end away from the sheath head by engaging with the second threaded structure.

[0017] In one embodiment of this application, the working sheath device further includes a fixing adjuster for fixing the working sheath:

[0018] The fixing adjuster includes a frame structure, fasteners, clamping structure and connector;

[0019] The frame structure is a hollow tubular shape;

[0020] Fasteners are provided on both sides of the frame structure, and the fasteners are inserted into the frame structure from both sides of the frame structure.

[0021] The frame structure is equipped with a clamping structure, which is connected to the fasteners inside the frame structure. The curvature of the clamping structure is the same as that of the outer sheath tube. After the fasteners are tightened, the clamping structure presses the outer sheath tube.

[0022] The frame structure is provided with a joint, which is used to connect an external automatic expansion device.

[0023] In one embodiment of this application, the outer wall of the outer sheath is provided with a scale, which is used to display the puncture depth of the working sheath.

[0024] In one embodiment of this application, the sheath head is streamlined in the shape of a bullet to reduce damage during puncture.

[0025] In one embodiment of this application, the length of the inner sheath is greater than the length of the outer sheath;

[0026] The sheath head of the inner sheath extends from the end of the outer sheath near the sheath head;

[0027] The end of the inner sheath away from the sheath head extends from the end of the outer sheath away from the sheath head.

[0028] In one embodiment of this application, the end of the outer sheath near the sheath head smoothly transitions to the sheath head.

[0029] The working sheath device of this application, by setting a first fixing component and placing the first fixing component inside the inner sheath, allows the working sheath to perform puncture more accurately when combined with a neuronavigation rod and a neuroendoscopy before puncture. Attached Figure Description

[0030] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain the application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0031] Figure 1 A schematic front view of a working sheath device (with the first and second fixing components not shown) according to an embodiment of this application is shown;

[0032] Figure 2 A schematic top view of the first fixing component of a working sheath device according to an embodiment of this application is shown;

[0033] Figure 3 A schematic top view of the second fixing member of the working sheath device according to an embodiment of this application is shown;

[0034] Figure 4 A schematic top view of the fixing adjuster of the working sheath device according to an embodiment of this application is shown;

[0035] Figure 5 A schematic top view of a working sheath device according to an embodiment of this application is shown.

[0036] Figure label:

[0037] 1. Working sheath; 2. First fixing component; 3. Second fixing component; 4. Fixing adjuster;

[0038] 11 Outer sheath; 12 Inner sheath; 121 Sheath head;

[0039] 21 First hole; 22 Second hole;

[0040] 31. Third hole;

[0041] 41 Frame structure; 42 Fasteners; 43 Clamping structure; 44 Joint. Detailed Implementation

[0042] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.

[0043] It should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this application to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout.

[0044] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below” or “under” the other element or feature will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0045] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprise” and / or “comprising,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0046] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms as defined in commonly used dictionaries shall be interpreted as having a meaning consistent with their meaning in the relevant field and / or the context of this specification, and not as in an ideal or overly formal sense, unless expressly defined herein.

[0047] To make the objectives, technical solutions, and advantages of this application more apparent, exemplary embodiments according to this application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of the embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. Based on the embodiments of this application described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of this application.

[0048] Therefore, in view of the aforementioned technical problems, this utility model proposes a working sheath device, referring to... Figure 1-5 This describes the working sheath device used to implement embodiments of the present invention. For example... Figure 1 , 2 As shown in Figures 1 and 3, the working sheath device includes a working sheath 1, a first fixing component 2, and a second fixing component 3.

[0049] like Figure 1 As shown, the working sheath 1 includes an outer sheath 11 and an inner sheath 12. The inner sheath 12 is disposed inside the outer sheath 11, and a sheath head 121 is provided at one end of the inner sheath 12. The inner sheath 12 can be removed from the outer sheath 11. After puncture, the inner sheath 12 can be removed from the outer sheath 11 before the surgical procedure, leaving the outer sheath 11 in the tissue for the surgical operation.

[0050] The first fixation component 2 is matched with the inner sheath 12 and enters the inner sheath 12 to fix the neuronavigation rod and neuroendoscope. The first fixation component 2 and the inner sheath 12 are detachably connected, either by insertion or thread. Before puncture, the first fixation component 2 is matched with the inner sheath 12 (at this time, the second fixation component 3 is not matched with the outer sheath 11), and the neuronavigation rod and neuroendoscope are fixed in the first fixation component 2. Through the cooperation between the neuronavigation rod and the neuroendoscope, the working sheath 1 is punctured to the designated position. From the start of puncture with the working sheath 1 to the puncture of the designated position, the working sheath 1, the neuronavigation rod, and the neuroendoscope work together to combine the puncture direction and depth with real-time observation of surrounding tissue structures, truly achieving real-time navigation-guided puncture and endoscopic observation. First, it can be adapted to the neuronavigation rod in real time, allowing for precise intraoperative hematoma puncture under navigation guidance. At the same time, the neuroendoscope can be used to observe the surrounding brain tissue and blood vessels in real time during the puncture process, avoiding important structures.

[0051] A neuronavigation rod is a positioning tool used in neurosurgery. Its main function is to synchronize the position of the patient and the guiding equipment in the operating room through optical marker tracking technology or other methods, thereby achieving precise localization of the lesion and accurate guidance for surgical procedures. This tool plays an important role in neurosurgery, significantly improving surgical precision and reducing damage to surrounding normal brain tissue and nerve function. The working sheath 1 is placed under the guidance of the neuronavigation rod, and then the neuroendoscope is inserted through the working sheath 1 for operation. The neuroendoscope is a minimally invasive tool that provides a clear surgical field, minimizing damage to normal brain tissue. The neuroendoscope is accessed through a small incision, and in conjunction with the working sheath 1, it allows for precise exploration and removal of hematomas while protecting normal brain tissue, reducing postoperative complications.

[0052] The second fixation component 3 mates with the outer sheath 11 and enters the outer sheath 11 to fix the neuroendoscope. The second fixation component 3 and the outer sheath 11 are detachably connected, either by insertion or thread. After puncture, the inner sheath 12 is removed from the outer sheath 11, and the first fixation component 2 inside the inner sheath 12 is also removed, leaving the outer sheath 11 in the tissue for surgical procedures. Before the surgical procedure, the second fixation component 3 is matched with the outer sheath 11, and the neuroendoscope is fixed inside the outer sheath 11. The neuroendoscope is used in conjunction with the working sheath 1 to remove hematoma and perform the surgery. The first fixation component 2 and the second fixation component 3 can be bolts, connected to the inner sheath 12 and the outer sheath 11 respectively through the external threads of the bolts.

[0053] According to the embodiments of the present invention, the working sheath device is provided with a first fixing component 2, which is placed inside the inner sheath tube 12. Before puncture, the first fixing component 2 is combined with the nerve navigation rod and the neuroendoscopy, which can enable the working sheath 1 to perform puncture more accurately.

[0054] like Figure 2 As shown in the embodiment of this application, the first fixing component 2 is provided with a first hole 21 and a second hole 22. The first hole 21 is located at the center of the first fixing component 2 and is used to place the neuronavigation rod. The second hole 22 is located at a non-central position of the first fixing component 2 and is used to place the neuroendoscope. Before puncture, the first fixing component 2 is placed into the inner sheath 12, and the neuronavigation rod is placed into the first hole 21. At this time, the first hole 21 is coaxially arranged with the working sheath 1 and the sheath head 121. The neuroendoscope is placed into the second hole 22. Because the second hole 22 is not located at the center of the first fixing component, the neuroendoscope is not located at the center of the working sheath 1, but at the edge of the working sheath 1. Since the neuronavigation rod needs to guide the working sheath 1, the neuronavigation rod needs to be located at the center of the working sheath 1. The first hole 21 and the second hole 22 can penetrate the first fixing component 2. The first hole 21 and the second hole 22 serve as supports to prevent the neuronavigation rod and the neuroendoscope from moving within the working sheath 1 and affecting the operation of other instruments.

[0055] like Figure 3 As shown in the embodiment of this application, a third hole 31 is provided within the second fixation component 3. The third hole 31 is located off-center from the second fixation component 3 and is used to place a neuroendoscope. After puncture and before surgical operation, since the working sheath 1 has already been punctured to the designated position, the neuronavigation rod is no longer needed for navigation. The first fixation component 2 and the inner sheath 12 are removed, leaving the outer sheath 11 in the tissue for surgical operation. The second fixation component 3 is matched with the outer sheath 11, and the neuroendoscope is placed into the third hole 31. The neuroendoscope is placed alone in the third hole 31 to avoid interference between the endoscope and surgical instruments during the operation. The second fixation component 3 can be a hollow tube, with the third hole 31 located at the edge of the second fixation component 3 for placing the neuroendoscope. The remaining space of the second fixation component 3 is used to place surgical instruments, etc.

[0056] In an embodiment of this application, a first threaded structure is provided on the inner wall of the inner sheath 12 at the end away from the sheath head 121. The first fixing member 2 enters the end of the inner sheath 12 away from the sheath head 121 by engaging with the first threaded structure. The first fixing member 2 can be a bolt, connected to the inner sheath 12 via its external thread. The external thread of the first fixing member 2 matches the first threaded structure, thereby entering the end of the inner sheath 12 away from the sheath head 121. In one embodiment, the diameter of the first fixing member 2 is smaller than the diameter of the inner sheath 12.

[0057] In an embodiment of this application, a second threaded structure is provided on the inner wall of the outer sheath 11 at the end away from the sheath head 121. The second fixing member 3 enters the end of the outer sheath 11 away from the sheath head 121 by cooperating with the second threaded structure. The second fixing member 3 can be a bolt, connected to the outer sheath 11 through the external thread of the bolt. The external thread of the second fixing member 3 matches the second threaded structure, thereby entering the end of the outer sheath 11 away from the sheath head 121. In one embodiment, the diameter of the second fixing member 3 is smaller than the diameter of the outer sheath 11.

[0058] like Figure 4 As shown in the embodiment of this application, the working sheath device further includes a fixing adjuster 4, which is used to fix the working sheath 1. The fixing adjuster 4 includes a frame structure 41, fasteners 42, a clamping structure 43, and a connector 44. The frame structure 41 is a hollow tube. Fasteners 42 are provided on both sides of the frame structure 41, and the fasteners 42 are inserted into the frame structure 41 from both sides. A clamping structure 43 is provided inside the frame structure 41, and the clamping structure 43 is connected to the fasteners 42 inside the frame structure 41. The curvature of the clamping structure 43 is the same as the curvature of the outer sheath tube 11. After the fasteners 42 are tightened, the clamping structure 43 presses the outer sheath tube 11. A connector 44 is provided on the frame structure 41, and the connector 44 is used to connect to an external automatic spreader device. The external automatic spreader device can fix the fixed adjuster 4 through the connector 44, thereby fixing the working sheath 1. The external automatic spreader can change the position of the fixed adjuster 4 and the working sheath 1, thereby realizing the multi-angle and multi-directional adjustment and fixation of the working sheath 1.

[0059] After the puncture is completed, the working sheath 1 is fixed by the fixation adjuster 4. Otherwise, during the operation, an assistant needs to hold the working sheath 1 to prevent it from moving or becoming unstable. The fastener 42 can be a bolt. As the fastener 42 rotates, it can approach or move away from the center of the frame structure 41. When the fastener 42 is away from the center of the frame structure 41, the position of the fixation adjuster 4 clamping the working sheath 1 can be adjusted to different positions on the working sheath 1. When the fastener 42 is close to the center of the frame structure 41, the end of the fastener 42 close to the clamping structure 43 squeezes the clamping structure 43, and the clamping structure 43 presses the outer sheath 11 of the working sheath 1, thereby fixing the working sheath 1. During hematoma removal, the fixation device can be used instead of the handle for manual fixation, allowing for multi-angle and multi-directional adjustment and fixation. The automatic retractor commonly used in neurology departments of hospitals is a medical device used to assist in the opening and fixation of tissues during surgery.

[0060] like Figure 5 As shown, the first fixation component 2 and the inner sheath 12 are removed, leaving the outer sheath 11 inside the tissue for surgical procedures. The second fixation component 3 is then matched with the outer sheath 11, allowing the neuroendoscope to be inserted into the third opening 31. The fixation adjuster 4 is then used to fix the outer sheath 11, and the surgical procedure can then be performed. This method allows for manual fixation without an assistant, freeing up one hand for better surgical execution.

[0061] In an embodiment of this application, a scale is provided on the outer wall of the outer sheath 11, which is used to display the puncture depth of the working sheath 1. In one embodiment, the outer sheath 11 and the inner sheath 12 of the working sheath 1 can be made of transparent material, which facilitates observation of the puncture depth of the working sheath 1 in conjunction with the scale.

[0062] In the embodiments of this application, the sheath head 121 is a streamlined bullet-shaped design to reduce damage during puncture.

[0063] In embodiments of this application, the inner sheath 12 is longer than the outer sheath 11. The sheath head 121 of the inner sheath 12 extends from the end of the outer sheath 11 near the sheath head 121. The end of the inner sheath 12 away from the sheath head 121 extends from the end of the outer sheath 11 away from the sheath head 121. The greater length of the inner sheath 12 compared to the outer sheath 11 facilitates the removal of the inner sheath 12 from the outer sheath 11.

[0064] In the embodiments of this application, the end of the outer sheath 11 near the sheath head 121 smoothly transitions to the sheath head 121, which facilitates the removal of the inner sheath 12 from the outer sheath 11.

[0065] Therefore, the working sheath device according to the embodiments of this application, by setting a first fixing component and placing the first fixing component inside the inner sheath, allows for more precise puncture by combining the first fixing component with the neuronavigation rod and neuroendoscopy before puncture. This truly achieves real-time navigation-guided puncture and endoscopic observation. Firstly, it can be adapted to the neuronavigation rod in real time, enabling precise intraoperative hematoma puncture under navigation guidance. Simultaneously, the neuroendoscopy can be used to observe the surrounding brain tissue and blood vessels during the puncture process, avoiding important structures. By setting a second fixing component, after puncture and before surgical operation, the first fixing component is removed, and the second fixing component is placed inside the outer sheath for surgery combined with the neuroendoscopy.

[0066] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0067] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed.

[0068] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0069] Similarly, it should be understood that, in order to simplify this application and aid in understanding one or more aspects of the application, various features of this application may sometimes be grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of this application. However, this approach should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, the point of application is that the corresponding technical problem can be solved with fewer features than all of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0070] Those skilled in the art will understand that, apart from the mutual exclusion of features, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus so disclosed can be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0071] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0072] It should be noted that the above embodiments are illustrative of this application and not limiting of it, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0073] The above description is merely a specific embodiment or illustration of the embodiments of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A working sheath device, characterized in that, Includes a working sheath, a first fixing component, and a second fixing component: The working sheath includes an outer sheath tube and an inner sheath tube, the inner sheath tube being disposed inside the outer sheath tube, and a sheath tube head being provided at one end of the inner sheath tube; The first fixation component matches the inner sheath and enters the inner sheath to fix the neuronavigation rod and neuroendoscopy. The second fixation component matches the outer sheath and enters the outer sheath to fix the neuroendoscopy.

2. The working sheath device as claimed in claim 1, characterized in that, The first fixing component has a first hole and a second hole: The first hole is located at the center of the first fixing component, and the first hole is used to place the neural navigation rod; The second hole is located off-center from the first fixing component, and the second hole is used to place a neuroendoscopy.

3. The working sheath device as claimed in claim 1, characterized in that, The second fixing component has a third hole: The third hole is located off-center from the second fixing component, and the third hole is used to place a neuroendoscopy.

4. The working sheath device as claimed in claim 1, characterized in that, The inner wall of the inner sheath is provided with a first thread structure at the end away from the head of the sheath. The first fixing component enters the inner sheath tube away from the head of the sheath tube by cooperating with the first threaded structure.

5. The working sheath device as claimed in claim 1, characterized in that, A second thread structure is provided on the inner wall of the outer sheath at the end away from the sheath head; The second fixing component enters the outer sheath at the end away from the sheath head by engaging with the second threaded structure.

6. The working sheath device as claimed in claim 1, characterized in that, The working sheath device further includes a fixing adjuster for fixing the working sheath: The fixing adjuster includes a frame structure, fasteners, clamping structure and connector; The frame structure is a hollow tubular shape; Fasteners are provided on both sides of the frame structure, and the fasteners are inserted into the frame structure from both sides of the frame structure. The frame structure is equipped with a clamping structure, which is connected to the fasteners inside the frame structure. The curvature of the clamping structure is the same as that of the outer sheath tube. After the fasteners are tightened, the clamping structure presses the outer sheath tube. The frame structure is provided with a joint, which is used to connect an external automatic expansion device.

7. The working sheath device as claimed in claim 1, characterized in that, The outer wall of the outer sheath is provided with a scale, which is used to display the puncture depth of the working sheath.

8. The working sheath device as claimed in claim 1, characterized in that, The sheath head is streamlined and bullet-shaped to reduce damage during puncture.

9. The working sheath device as claimed in claim 1, characterized in that, The length of the inner sheath is greater than the length of the outer sheath; The sheath head of the inner sheath extends from the end of the outer sheath near the sheath head; The end of the inner sheath away from the sheath head extends from the end of the outer sheath away from the sheath head.

10. The working sheath device as claimed in claim 1, characterized in that, The outer sheath has a smooth transition at one end near the head of the sheath.

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