Device and method for obtaining a portion of tissue from a living being

Abstract

The application discloses a kind of biological partial tissue acquisition device and method, biological partial tissue acquisition device includes outer catheter, inner catheter and at least one cutting edge, inner catheter is movably nested in outer catheter, and at least one gap part is opened on the outer wall of inner catheter;Cutting edge is preformed into set shape, and the first end of cutting edge is set in gap part, and cutting edge can be switched between storage state and expansion state;When cutting edge is in storage state, cutting edge is housed in the inner cavity of outer catheter with inner catheter, and the second end of cutting edge is coplanar with the outer wall of inner catheter;When cutting edge is in expansion state, cutting edge restores to set shape, and the second end of cutting edge protrudes from the outer wall of inner catheter.The biological partial tissue acquisition device can sample more biological samples with smaller diameter inner catheter, thereby improving the use effect of biological partial tissue acquisition device.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of biological partial tissue acquisition device and method, belong to medical instrument field. BACKGROUND

[0002] The patent with disclosure number CN110301945A discloses a medical clinical tumor biopsy sampling device, comprising a sampling adsorption cylinder, a sampling tube is arranged at the bottom of the sampling adsorption cylinder, and the sampling tube is in communication with the inside of the sampling adsorption cylinder, a sampling cutting device is arranged at the bottom end of the sampling tube, movable rods are slidably installed on the top of both sides of the sampling tube along the vertical direction, and steel wires are fixedly connected to the bottom of the two movable rods.

[0003] The medical clinical tumor biopsy sampling device moves the blades on the two cutting bodies inward at the same time and cuts and samples the lesions to reduce the work difficulty of medical personnel, however, the overall structure of the medical clinical tumor biopsy sampling device is relatively complex, and the overall size is relatively large, which makes it difficult to sample some small or hidden tissues, and the use effect is not good. SUMMARY

[0004] The primary technical problem to be solved by the present application is to provide a biological partial tissue acquisition device.

[0005] Another technical problem to be solved by the present application is to provide a biological partial tissue acquisition method.

[0006] To achieve the above technical purposes, the present application adopts the following technical solutions:

[0007] A biological partial tissue acquisition device, comprising:

[0008] An outer catheter;

[0009] An inner catheter movably nested in the outer catheter, and at least one notch part is formed on the outer wall of the inner catheter and in communication with the inner cavity of the inner catheter;

[0010] At least one cutting blade, the cutting blade is pre-formed into a set shape, and the first end of the cutting blade is arranged in the notch part, and the cutting blade can be switched between a storage state and an expanded state;

[0011] When the cutting blade is in the storage state, the cutting blade is stored in the inner cavity of the outer catheter together with the inner catheter, and the second end of the cutting blade is coplanar with the outer wall of the inner catheter; when the cutting blade is in the expanded state, the cutting blade returns to the set shape, and the second end of the cutting blade protrudes from the outer wall of the inner catheter.

[0012] Preferably, the cutting edge is symmetric about a center line, the center line is an arc, and in a projection of a radial section of the inner catheter, the center line is tangent to a center axis of the inner catheter.

[0013] Preferably, an extension line of the cutting edge from the second end to the first end forms a first included angle with a generatrix of the inner catheter, and the extension line forms a second included angle with a longitudinal section of the inner catheter, wherein the longitudinal section of the inner catheter passes through both the center axis of the inner catheter and the generatrix of the inner catheter.

[0014] Preferably, a plurality of the notch portions are formed on the outer wall of the inner catheter, and the plurality of the notch portions are uniformly distributed around the circumference of the outer wall of the inner catheter. A plurality of the cutting edges are provided, and each of the cutting edges corresponds to one of the notch portions.

[0015] Preferably, the top portions of the plurality of the notch portions are located in the same plane.

[0016] Preferably, the top portions of the plurality of the notch portions are located in different planes and are helically distributed around the circumference of the outer wall of the inner catheter.

[0017] Preferably, the cutting edge is integrally formed with the inner catheter.

[0018] Preferably, the first end of the cutting edge is detachably mounted in the notch portion of the inner catheter.

[0019] Preferably, the cutting edge is curved clockwise or counterclockwise around the center axis of the inner catheter, so that the cutting edge is curved.

[0020] A method for obtaining a part of tissue of a living body by using the obtaining device, comprising the following steps:

[0021] The inner catheter is reversely rotated around the axis of the outer catheter until the cutting edge and the inner catheter are accommodated in the inner cavity of the outer catheter, at this time, the obtaining device is in a storage state; the inner catheter can be translated along the axis of the outer catheter until the first end of the cutting edge extends out of the inner cavity of the outer catheter, at this time, the obtaining device is in an expanded state; the inner catheter can be positively rotated around the axis of the outer catheter when the first end of the cutting edge extends out of the inner cavity of the outer catheter, at this time, the obtaining device is in a rotating state; the obtaining device can be switched between the storage state, the expanded state and the rotating state, wherein the directions of the positive rotation and the reverse rotation are opposite;

[0022] The head of the outer catheter is inserted into the tissue to be biopsied, and the outer catheter is fixed;

[0023] The inner conduit is rotated in the forward direction along the axial direction of the outer conduit until the first end of the cutting blade extends out from the inner cavity of the outer conduit, so that the acquisition device switches from the retracted state to the expanded state;

[0024] Continue to rotate the inner catheter around the axial direction of the outer catheter in the forward direction, so that the acquisition device switches from the expanded state to the rotated state, thereby using the cutting blade to cut the tissue to be biopsied;

[0025] The biological tissue cut by the cutting blade is aspirated out of the body through the notch under the cutting blade; or the biological tissue cut by the cutting blade is translated along the axis of the outer catheter along with the inner catheter until the inner catheter and the biological tissue are contained in the outer catheter and taken out of the body along with the outer catheter, thus completing the sampling process.

[0026] The present invention has the following technical effects: by setting a cutting edge on the inner catheter, the biological sample obtained is larger or more (greater than the diameter of the puncture needle tract), but the diameter of the biopsy needle used for sampling is smaller, resulting in a smaller wound. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the device for obtaining partial tissues of a biological organism provided by the present invention in its unused state;

[0028] Figure 2 This is a three-dimensional structural diagram of the device for obtaining partial tissues of an organism provided by the present invention in use.

[0029] Figure 3 This is a schematic diagram of the first included angle α;

[0030] Figure 4 This is a schematic diagram of the second included angle β;

[0031] Figure 5 This is a schematic diagram of the internal catheter and the cutting blade;

[0032] Figure 6 This is a diagram illustrating the use of a device for obtaining parts of a biological organism's tissues.

[0033] Figure 7 This is a diagram illustrating another application scenario for a device used to obtain parts of a living organism's tissues.

[0034] Figure 8 This is another structural diagram of the internal catheter and cutting blade;

[0035] Figure 9 This is another structural diagram of the internal catheter and cutting blade.

[0036] In the accompanying drawings, the reference numerals indicate:

[0037] 1. Outer cannula; 2. Inner cannula; 21. Notch; 211. Protrusion; 3. Cutting edge; 31. First end; 32. Second end; 33. Blade; 34. Back of blade; 311. Groove; 4. Guide wire. Detailed Implementation

[0038] The technical content of the present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0039] Example 1:

[0040] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a device for obtaining a part of a biological tissue, such as a biopsy needle or puncture needle for sampling or internal resection, comprising: an external catheter 1, an internal catheter 2, and at least one cutting blade 3.

[0041] The inner conduit 2 is movably nested within the outer conduit 1, and at least one notch 21 communicating with the inner cavity of the inner conduit 2 is provided on the outer wall of the inner conduit 2; the cutting blade 3 is pre-formed into a predetermined shape, and the first end 31 of the cutting blade 3 is disposed within the notch 21, from... Figure 2 As can be seen, the second end 32 of the cutting blade 3 is located outside the outer wall of the inner conduit 2 and has a set distance from the outer wall of the inner conduit 2.

[0042] Reference Figure 3 and Figure 4 As shown, the extension line from the second end 32 of the cutting blade to the first end 31 forms a first angle α with the generatrix of the inner conduit 2. The second end 32 of the cutting blade 3 is coplanar with the outer wall of the inner conduit 2, and the second end 32 of the cutting blade 3 protrudes from the outer wall of the inner conduit 2, thereby causing the cutting blade 3 to fold outward relative to the outer wall of the inner conduit 2. The first angle α is 5-45°. At the same time, this extension line forms a second angle β with the longitudinal section of the inner conduit 2, thereby causing the cutting blade 3 to be in a bent state. The second angle β is 5-45°. The generatrix of the inner conduit passes through the first end 31 of the cutting blade, and the longitudinal section of the inner conduit passes through both the central axis of the inner conduit and the generatrix of the inner conduit 2.

[0043] Reference Figure 1 and Figure 2 As shown, the shape of the cutting blade 3 is symmetrical about the centerline, which is an arc, and in the projection of the radial section of the inner conduit 2, the centerline is tangent to the central axis of the inner conduit 2. The cutting blade 3 can switch between a retracted state and an expanded state. When the cutting blade 3 is in the retracted state, the cutting blade 3 and the inner conduit 2 are together housed within the inner cavity of the outer conduit 1 (i.e., Figure 1 (as shown in the diagram); when the cutting edge 3 is in the expanded state, the cutting edge 3 returns to the set shape (i.e., Figure 2 (The state shown).

[0044] The biological tissue acquisition device in this embodiment is mainly used for sampling tumor or lesion tissue for medical testing. Taking the sampling of tissue to be biopsied as an example, the inner catheter 2 and the cutting blade 3 are pre-accommodated within the outer catheter 1. In specific use, firstly, the head of the outer catheter 1 is inserted into the tissue to be biopsied 10 and fixed in place. Then, the inner catheter 2 is rotated forward along the axis of the outer catheter 1. As the inner catheter 2 extends further, the cutting blade 3 gradually returns to its set shape after being no longer compressed. Next, the inner catheter 2 continues to rotate, causing it to drive the cutting blade 3 deeper into the tissue to be biopsied, and the cutting blade 3 is used to cut the tissue 10. Finally, the biological tissue cut by the cutting blade 3 is aspirated out of the body through the notch 21 under the cutting blade 3, completing the sampling process. Therefore, by setting the cutting blade 3 on the inner catheter 2, more biological samples can be sampled using an inner catheter 2 with a smaller diameter.

[0045] In the above embodiments, the external catheter 1 is a slender, round tube with a pointed tip. The external catheter 1 is made of stainless steel, has a size of 1-5 mm, and is designed to have appropriate rigidity so that its tip can be used to insert into the tumor or lesion tissue. However, the material and size of the external catheter 1 are not limited, and can be selected according to specific needs.

[0046] Reference Figure 5 As shown, the inner catheter 2 is a slender cylindrical tube with a pointed tip. The inner diameter of the inner catheter 2 is 1 mm, and its length is 100 mm, which facilitates insertion into the tissue to be biopsied. The outer diameter of the inner catheter 2 is smaller than the inner diameter of the outer catheter 1, allowing the inner catheter 2 to be inserted into the lumen of the outer catheter 1. At the same time, the lumen of the inner catheter 2 is used to insert the guide wire 4. After the tip of the outer catheter 1 is inserted into the tissue to be biopsied 10 and the outer catheter 1 is fixed, the guide wire 4 is first inserted into the predetermined position of the tissue to be biopsied 10. Then, the inner catheter 2 rotates and advances along the guide wire 4 to guide the inner catheter 2.

[0047] Continue to refer to Figure 5 As shown, the cutting edge 3 is a metal sheet with a predetermined shape, which can be selected as needed, such as a rectangle, triangle, arc, semicircle, or other shapes. The cutting edge 3 is located close to the tip of the inner conduit 2, with a distance of 1-5 mm between the cutting edge 3 and the tip of the inner conduit 2. Specifically, in this embodiment, the cutting edge 3 is approximately parallelogram-shaped, and the second end 32 of the cutting edge 3 is bent counterclockwise around the central axis of the inner conduit 2, thus making the cutting edge 3 curved. (Refer to...) Figure 5In the orientation of the inner catheter 2, the side to the right of the cutting edge 3 is the blade 33, and the side to the left of the cutting edge 3 is the back of the blade 34. At the same time, the distance from the side where the blade 33 is located to the central axis of the inner catheter 2 should be greater than the distance from the side where the back of the blade 34 is located to the central axis of the inner catheter 2. This makes the side where the blade 33 is located slightly higher than the side where the back of the blade 34 is located. As a result, when the inner catheter 2 rotates counterclockwise, the side where the blade 33 is located will be subject to the resistance of the surrounding tissue to be biopsied, thus generating a cutting force. At the same time, when the inner catheter 2 rotates clockwise, because the side where the blade 33 is located is slightly higher, the cutting edge 3 can retract to the notch 21 under the slight pressure of the inner catheter 2 and the outer catheter 1. This achieves the effect of cutting when the inner catheter 2 rotates counterclockwise and retracting when it rotates clockwise.

[0048] Reference Figure 6 and Figure 7 As shown, in practical use, after the outer catheter 1 is inserted into and fixed to the tissue to be biopsied, the inner catheter 2 rotates counterclockwise. As the inner catheter 2 moves along the axial direction of the outer catheter 1, the blade 33 of the cutting edge 3 cuts the tissue 10 to be biopsied, ultimately forming a cylindrical cutting cavity 20 within the tissue 10. This cutting cavity 20 contains the cut tissue. The cut tissue is then aspirated out of the body to complete the sampling operation. After sampling, the inner catheter 2 rotates clockwise, causing the cutting edge 3 to retract to the notch 21 under slight pressure from the inner catheter 2 and the outer catheter 1. Once the inner catheter 2 and the cutting edge 3 are completely contained within the outer catheter 1, the outer catheter 1 can be withdrawn, thus completing the retraction operation of the entire device.

[0049] One embodiment involves removing the tissue to be biopsied 10 via aspiration. In another embodiment, if the outward angle of the cutting edge 33 is relatively large, i.e. Figure 3 When the α angle is large, the cutting blade 3 will cut off a relatively large piece of the tissue to be biopsied 10. For large pieces of tissue to be biopsied 10, sampling by aspiration is difficult. The large piece of tissue to be biopsied 10 can be removed from the body along with the inner catheter 2, thus completing the sampling process. Furthermore, it should be noted that whether the tissue to be biopsied 10 will be cut into a large piece is related to the number of rotations of the cutting blade 3. The fewer the rotations, the greater the likelihood of the tissue to be biopsied 10 being in a large piece shape; conversely, the tissue to be biopsied 10 may be mashed into a paste, which can be sampled by aspiration. Specific selection can be made according to the required sampling situation to meet different medical testing needs.

[0050] It is easy to understand that, in another embodiment, the second end 32 of the cutting blade 3 can also be bent clockwise around the central axis of the inner guide tube 2, and the setting direction of the blade and the back of the blade can be adjusted accordingly, so that the inner guide tube 2 can cut when it rotates clockwise and retract when it rotates counterclockwise.

[0051] In the above embodiment, preferably, the shape of the notch 21 matches the shape of the cutting blade 3. That is, the notch 21 is an arc-shaped notch similar to a parallelogram opened along the outer wall of the inner conduit 2, so that the cutting blade 3 can completely retract into the notch 21 under the squeezing force of the inner conduit 2 and the outer conduit 1. This reduces the gap between the inner conduit 2 and the outer conduit 1, prevents the inner conduit 2 from shaking, and ensures the stability of the inner conduit 2 moving within the outer conduit 1.

[0052] In the above embodiments, preferably, the cutting blade 3 and the inner conduit 2 are integrally formed. Specifically, the inner conduit 2 with the cutting blade 3 can be directly formed by injection molding, or the inner conduit 2 can be produced first, and then the cutting blade 3 can be cut into the outer wall of the inner conduit 2 according to a set shape, so that the integrity and stability of the cutting blade 3 and the inner conduit 2 are better.

[0053] Reference Figure 8 As shown, in another embodiment, the cutting blade 3 and the inner conduit 2 can also be made into a separate structure. Then, the first end 31 of the cutting blade 3 can be detachably installed in the notch 21 of the inner conduit 2. For example, a protrusion 211 can be formed in the notch 21 of the inner conduit 2, and correspondingly, a groove 311 can be formed on the end face of the first end 31 of the cutting blade 3. When the cutting blade 3 needs to be used, the groove 311 of the cutting blade can be directly engaged with the protrusion 211 in the notch 21. When the cutting blade 3 needs to be disassembled or replaced, the groove 311 and the protrusion 211 can be separated. This improves the flexibility of using the cutting blade 3 and the inner conduit 2.

[0054] Example 2:

[0055] Based on Example 1, referring to Figure 5 As shown, the outer wall of the inner conduit 2 has multiple notches 21, which are evenly distributed around the periphery of the outer wall of the inner conduit 2. There are multiple cutting blades 3, and each cutting blade 3 corresponds to each notch 21.

[0056] Specifically, in this embodiment, there are three notches 21, and the tops of the three notches 21 are located in the same plane. This results in the three notches 21 being distributed in a ring around the periphery of the outer wall of the inner catheter 2. The angle formed by two adjacent notches 21 and the central axis of the inner catheter 2 is 120°. Correspondingly, there are also three cutting blades 3. Thus, the cooperation of the three notches 21 and the three cutting blades 3 improves the cutting effect on the biopsy tissue. It is readily understood that in other embodiments, the notches 21 and cutting blades 3 may be two, four, five, or more; this is not limited here.

[0057] Example 3:

[0058] Based on Example 1, referring to Figure 9 As shown, the outer wall of the inner conduit 2 has multiple notches 21. The tops of the multiple notches 21 are located in different planes and are spirally distributed around the periphery of the outer wall of the inner conduit 2. There are multiple cutting blades 3, and each cutting blade 3 corresponds to each notch 21.

[0059] Specifically, in this embodiment, there are three notches 21. However, unlike in Embodiment 2, the tops of the three notches 21 in this embodiment are located in different planes. That is, the three notches 21 are spaced apart along the axial direction of the inner catheter 2, thus creating a spiral-like upward structure. This expands the cutting range in the axial direction, thereby improving the cutting effect on the biopsy tissue.

[0060] Example 4:

[0061] This embodiment also provides a system for obtaining partial tissues of an organism, which includes the device for obtaining partial tissues of an organism in any of the embodiments one to three.

[0062] Specifically, the biological tissue acquisition system may also include an external catheter fixation device, a suction device, and other electronically controlled devices. The external catheter fixation device is used to fix the external catheter 1 after it is inserted into the tissue to be biopsied. The suction device is used to aspirate the tissue to be biopsied cut off by the cutting blade 3 to the outside of the body, completing the sampling. The electronically controlled devices are used for circuit control or mechanical control to improve the degree of automation. In this embodiment, the external catheter fixation device, suction device, and other electronically controlled devices are not specifically limited and can be adaptively selected or adjusted according to actual needs.

[0063] Example 5:

[0064] This embodiment also provides a method for obtaining a portion of biological tissue using the acquisition device in any of the embodiments 1 to 3, specifically including the following steps:

[0065] S10. The inner tube 2 is rotated in the opposite direction around the axis of the outer tube 1 (clockwise rotation around the axis of the outer tube 1 in this embodiment) until the cutting blade 3 and the inner tube 2 are housed together in the inner cavity of the outer tube 1. At this time, the acquisition device is in the storage state. The inner tube 2 can be translated along the axis of the outer tube 1 (rotational forward movement in this embodiment, or direct translation) until the first end of the cutting blade 3 extends out from the inner cavity of the outer tube 1. At this time, the acquisition device is in the expansion state. With the first end of the cutting blade 3 extending out from the inner cavity of the outer tube 1, the inner tube 2 can be rotated in the forward direction around the axis of the outer tube 1. At this time, the acquisition device is in the rotation state. The acquisition device can switch between the storage state, the expansion state, and the rotation state, wherein the directions of forward rotation and reverse rotation are opposite.

[0066] S20. Insert the head of the external catheter 1 into the tissue to be biopsied 10 and fix the external catheter 1.

[0067] S30. Rotate the inner tube 2 in the forward direction (i.e., counterclockwise) along the axial direction of the outer tube 1 until the first end of the cutting blade 3 extends out of the inner cavity of the outer tube 1, so that the acquisition device switches from the storage state to the expansion state.

[0068] S40. Continue to rotate the inner catheter 2 in the forward direction (i.e., counterclockwise) around the axis of the outer catheter 1 so that the acquisition device switches from the expansion state to the rotation state, thereby using the cutting blade 3 to cut the tissue to be biopsied 10.

[0069] S50. The biological tissue cut by the cutting blade 3 is aspirated out of the body through the notch 21 under the cutting blade 3; or the biological tissue cut by the cutting blade 3 is translated along the axis of the outer catheter along with the inner catheter 2 (in this embodiment, it is rotated and retracted clockwise around the axis of the outer catheter 1) until the inner catheter 2 and the biological tissue are housed together in the outer catheter 1 and taken out of the body along with the outer catheter 1, thus completing the sampling process.

[0070] The biological tissue acquisition device provided by this invention, in practical use, involves pre-accommodating an inner catheter and a cutting blade within an outer catheter. The head of the outer catheter is then inserted into the tissue to be biopsied and fixed in place. Next, the inner catheter is rotated forward along the axial direction of the outer catheter. As the inner catheter extends, the cutting blade gradually returns to its predetermined shape after being compressed. Then, the inner catheter continues to rotate, causing it to carry the cutting blade deeper into the tissue to be biopsied, where it is used to cut the tissue. Finally, the biological tissue cut by the cutting blade is aspirated out of the body using a suction device or removed from the body along with the inner catheter, completing the sampling process. Therefore, by incorporating a cutting blade into the inner catheter, more biological samples can be collected using a smaller diameter inner catheter. This device is applicable to the biopsy or internal resection of partial tissue from humans or animals such as pets.

[0071] The present invention has been described in detail above. Any obvious modifications made to this invention by those skilled in the art without departing from its essential content will constitute an infringement of the patent rights of this invention and will incur corresponding legal liability.

Claims

1. A device for obtaining a portion of a biological tissue, characterized in that, include: External catheter; An inner catheter is movably nested inside the outer catheter, and at least one notch is provided on the outer wall of the inner catheter to communicate with the inner lumen of the inner catheter, so as to form a sampling channel for aspirating samples. At least one cutting edge, the cutting edge being pre-formed into a predetermined shape, and the first end of the cutting edge being disposed within the notch portion, the cutting edge being switchable between a retracted state and an expanded state; the cutting edge is bent clockwise or counterclockwise around the central axis of the inner conduit to make the cutting edge curved, and the shape of the cutting edge is symmetrical about the center line, the center line being an arc, and in the projection of the radial section of the inner conduit, the center line is tangent to the central axis of the inner conduit; the extension line from the second end of the cutting edge to the first end forms a first angle with the generatrix of the inner conduit, and the extension line forms a second angle with the longitudinal section of the inner conduit, wherein the longitudinal section of the inner conduit passes through both the central axis of the inner conduit and the generatrix of the inner conduit; When the cutting blade is in the retracted state, the cutting blade and the inner conduit are housed together in the inner cavity of the outer conduit, and the second end of the cutting blade is coplanar with the outer wall of the inner conduit; when the cutting blade is in the expanded state, the cutting blade returns to the set shape, and the second end of the cutting blade protrudes from the outer wall of the inner conduit. When the external catheter is inserted into and fixed to the tissue to be biopsied, the internal catheter rotates and drives the cutting blade to move along the axial direction of the external catheter to cut the tissue to be biopsied and form a cylindrical cutting cavity in the tissue to be biopsied. Thus, by continuously aspirating the cut tissue to be biopsied out of the body, the continuous sampling operation is completed. Once the external catheter is inserted into and fixed to the tissue to be biopsied, the internal catheter rotates and drives the cutting blade to move along the axial direction of the external catheter to cut the tissue to be biopsied, forming a large piece of tissue to be biopsied; thereby, by retracting the internal catheter, the large piece of tissue to be biopsied is collected into the sampling channel, and then the acquisition device is retracted as a whole to complete a single sampling operation.

2. The acquisition device as described in claim 1, characterized in that: The outer wall of the inner conduit has multiple notches, which are evenly distributed around the periphery of the outer wall of the inner conduit. There are multiple cutting blades, and each cutting blade corresponds to one of the notches.

3. The acquisition device as described in claim 2, characterized in that: The tops of the multiple notches are located in the same plane.

4. The acquisition device as described in claim 2, characterized in that: The tops of the multiple notches are located in different planes and are spirally distributed around the periphery of the outer wall of the inner conduit.

5. The acquisition device as described in claim 1, characterized in that: The cutting blade is integrally formed with the inner catheter.

6. The acquisition device as described in claim 1, characterized in that: The first end of the cutting blade is detachably installed inside the notch of the inner conduit.

Images