Sampling device convenient to separate

Abstract

The invention provides a sampling device convenient to separate, and relates to the technical field of medical instruments, the sampling device comprises an outer positioning fixing frame, a coaxial needle sheath piece, a coaxial needle core piece and an inner sampling needle core piece, the coaxial needle sheath piece axially penetrates through the outer positioning fixing frame in a sliding manner, the coaxial needle core piece axially slides in the coaxial needle sheath piece, and the inner sampling needle core piece axially slides in the coaxial needle sheath piece. An inner sampling needle core part axially slides on the inner side of the coaxial needle core part, a puller screw is in threaded connection with the side face of the outer positioning fixing frame, outer connecting rotating shafts are fixedly arranged on the two sides of the outer positioning fixing frame, a side communicating pipe is arranged on one side of the upper end of the coaxial needle sheath part in a communicating mode, and the side communicating pipe is fixedly communicated with a side piston pipe; and the upper end of the coaxial needle sheath piece is screwed and sealed with the upper sealing cover. The piston pipe is communicated with the inner sampling needle core part to suck air to generate suction force, the suction force of the inner sampling needle core part pulls more tumor samples to enter the inner part from the inner sampling hole, sufficient sampling is ensured, and the problems that the sampling quantity of a coaxial needle core part at each time cannot be determined, and the sampling frequency is large are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices for tumor sampling, and in particular to a sampling device that is convenient for separation. Background Art

[0002] A tumor is a mass formed by abnormal cell proliferation. Tumors are divided into benign tumors and malignant tumors, and benign tumors and malignant tumors are treated through different regimens respectively. Therefore, it is necessary to judge benign tumors and malignant tumors during tumor treatment, and benign tumors and malignant tumors are judged by analyzing the tumor samples taken.

[0003] The existing sampling device uses a coaxial needle sheath and a coaxial needle core to perform tumor sampling. The groove of the coaxial needle core is used for the access and separation process of the tumor tissue sample. The coaxial needle core moves the tumor tissue sample to the outside of the body, and the operator still needs to pick out the tumor tissue sample of the coaxial needle core with a needle. The coaxial needle core relies on the self-expansion of the tumor to be embedded in the groove of the coaxial needle core. Therefore, the number of samples taken each time by the coaxial needle core cannot be determined, and the coaxial needle core may have a situation where less tumor tissue is sampled, resulting in a need for multiple sampling times. Summary of the Invention

[0004] The embodiment of the present disclosure relates to a sampling device that is convenient for separation. After the inner sampling needle core is inserted into the tumor, the upper piston moves away from the inner sampling needle core, and the upper piston tube communicates with the inner sampling needle core to inhale and generate suction. The suction of the inner sampling needle core pulls more tumor samples into the interior through the inner sampling hole. Active control operation realizes sampling of more tumor samples, ensures sufficient sampling each time, and reduces the number of samplings. After the inner sampling needle core moves to the outside, the upper piston moves closer to the inner sampling needle core, and the upper piston tube communicates with the inner sampling needle core to exhale and generate thrust, pushing the tumor tissue sample inside the inner sampling hole outwards, facilitating the separation operation of the tumor tissue sample, and eliminating the operation of the operator picking out the sample with a needle. The outer positioning and fixing frame adjusts the sampling angle along with the coaxial needle sheath, and at the same time, the outer positioning and fixing frame fixes the sampling angle of the coaxial needle sheath, eliminating the manual assistance operation of the operator on the coaxial needle sheath, reducing the number of assisting personnel during the sampling process. The upper end of the coaxial needle sheath is sealed with the upper sealing cover, and the side piston moves to generate suction on the coaxial needle sheath. The coaxial needle sheath can adsorb the remaining tumor blood and water generated during sampling inside, avoiding the situation where the remaining tumor blood and water spread and grow new tumors towards the surrounding tissues outside the tumor.

[0005] In a first aspect of the present disclosure, a sampling device that is convenient for separation is provided, specifically including: an outer positioning fixing frame, a coaxial needle sheath member, a coaxial needle core member, and an inner sampling needle core member. The outer positioning fixing frame axially penetrates and slides with the coaxial needle sheath member. The coaxial needle core member axially slides inside the coaxial needle sheath member. The inner sampling needle core member axially slides inside the coaxial needle core member. A tightening screw is screwed on the side of the outer positioning fixing frame. Outer connecting rotating shafts are fixedly arranged on both sides of the outer positioning fixing frame. The outer connecting rotating shaft is rotationally connected to the outer connecting rotating ring. The outer connecting rotating shaft fixed in the middle of the outer connecting rotating ring is rotationally connected to the head of the telescopic rod. The rear part of the telescopic rod is slidably connected to the upper pipe fitting of the outer fixing frame. A lower fixing plate is fixed at the lower end of the outer fixing frame. A lower fixing screw is rotated at the lower end of the outer fixing frame.

[0006] In at least some embodiments, the tightening screw screwed on the head of the telescopic rod is tightened against the outer connecting rotating shaft of the outer connecting rotating ring to fix the angle of the outer connecting rotating ring. A lower fixing plate is screwed in the middle of the lower fixing screw. The tightening screw screwed on the upper part of the outer fixing frame is tightened against the telescopic rod to fix the telescopic distance between the outer fixing frame and the telescopic rod. The tightening screw screwed on the outer connecting rotating ring is tightened against the outer connecting rotating shaft of the outer positioning fixing frame.

[0007] In at least some embodiments, a side communication pipe is communicatively arranged on one side of the upper end of the coaxial needle sheath member. The side communication pipe is fixedly connected to the side piston pipe. A side piston member slides inside the side piston pipe. The upper end of the coaxial needle sheath member is screwed and sealed with an upper sealing cover. The coaxial needle sheath member is first inserted into the human body and inserted into the shallow layer position of the tumor, and a sampling operation is performed inside the coaxial needle sheath member.

[0008] In at least some embodiments, a lower sampling opening is axially penetrated and opened at the lower end of the coaxial needle core member. An upper handle is fixedly arranged at the top of the coaxial needle core member. The outer side of the coaxial needle core member slidably fits with the inner wall of the coaxial needle sheath member. The coaxial needle core member punctures deeper into the tumor, and the inner sampling needle core member moves with the coaxial needle core member during puncture.

[0009] In at least some embodiments, a lower splitting knife ring is fixedly arranged at the lower end of the inner sampling needle core member. Inner sampling holes are axially penetrated in the lower part of the inner sampling needle core member. The upper end of the inner sampling needle core member is fixedly connected to the upper piston pipe. An upper piston member axially slides inside the upper piston pipe.

[0010] In at least some embodiments, when the lower dividing cutter ring is located below the inner sampling hole and the inner sampling needle core is inside the coaxial needle core, the inner sampling hole and the lower sampling opening are aligned. When the lower dividing cutter ring is located below the lower sampling opening, the lower dividing cutter ring moves upward to divide the tumor sample inside the inner sampling hole. After the inner sampling needle core is inserted into the tumor, the upper piston moves away from the inner sampling needle core. The movement of the upper piston causes suction in the upper piston tube. The upper piston tube is connected to the inner sampling needle core to generate suction. The suction of the inner sampling needle core pulls more tumor samples into the interior through the inner sampling hole.

[0011] In at least some embodiments, when the coaxial needle sheath and the outer positioning and fixing frame penetrate, the tightening screw on the side of the outer positioning and fixing frame is in tight contact with the coaxial needle sheath, fixing the position of the coaxial needle sheath. The outer positioning and fixing frame and the outer connecting rotating ring adjust and fix the sampling angle along with the coaxial needle sheath.

[0012] In at least some embodiments, when the upper sealing cover is screwed and sealed with the coaxial needle sheath, the lower end of the side piston is in communication with the side connecting pipe and the side piston tube. When the side piston moves away from the coaxial needle sheath, suction is generated in the side piston tube. The side piston tube is connected to the coaxial needle sheath through the side connecting pipe to generate suction. The bottom end of the coaxial needle sheath can adsorb and retain residues such as tumor blood and water generated during sampling inside the coaxial needle sheath.

[0013] The present invention provides a sampling device that is convenient for separation, having the following beneficial effects: After the inner sampling needle core is inserted into the tumor, the upper piston moves away from the inner sampling needle core. The upper piston tube is connected to the inner sampling needle core to generate suction. The suction of the inner sampling needle core pulls more tumor samples into the interior through the inner sampling hole. Active control operation enables sampling of more tumor samples, ensuring sufficient sampling each time and reducing the number of samplings.

[0014] After the inner sampling needle core moves to the outside, the upper piston moves closer to the inner sampling needle core. The upper piston tube is connected to the inner sampling needle core to generate a thrust, pushing the tumor tissue sample inside the inner sampling hole outward, facilitating the separation operation of the tumor tissue sample and eliminating the operation of manually picking out the sample with a needle by personnel.

[0015] The outer positioning and fixing frame adjusts and changes the sampling angle along with the coaxial needle sheath, and at the same time fixes the sampling angle of the coaxial needle sheath, eliminating the manual assistance operation of personnel for the coaxial needle sheath and reducing the number of assisting personnel during sampling.

[0016] After sampling is completed, the upper end of the coaxial needle sheath and the upper sealing cover are sealed, and the side piston moves to generate suction against the coaxial needle sheath. The coaxial needle sheath can adsorb residues such as tumor blood and water generated during sampling inside, avoiding the situation where residues such as tumor blood and water spread and grow anew towards the surrounding tissues outside the tumor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below.

[0018] The accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] In the accompanying drawings: Figure 1 A schematic diagram showing the overall structure of the present application is shown; Figure 2 A schematic diagram showing the structure of the outer positioning and fixing frame of the present application is shown; Figure 3 A schematic diagram showing the cross-sectional structure of the side piston tube of the present application is shown; Figure 4 A schematic diagram showing the structure of the coaxial needle core member of the present application is shown; Figure 5 A schematic diagram showing the cross-sectional structure of the upper piston tube of the present application is shown; Figure 6 A schematic diagram showing the structure of the coaxial needle sheath member and the coaxial needle core member in a penetrating and sliding state of the present application is shown; Figure 7 A schematic diagram showing the structure of the inner sampling needle core member and the coaxial needle core member in a penetrating and sliding state of the present application is shown; Figure 8 A schematic diagram showing the split state of the present application is shown.

[0020] LIST OF REFERENCE NUMERALS 1. Outer positioning and fixing frame; 101. Tightening screw; 102. Outer connecting rotating shaft; 103. Telescopic rod; 104. Outer fixing frame; 105. Lower fixing plate; 106. Lower fixing screw; 107. Outer connecting rotating ring; 2. Coaxial needle sheath member; 201. Side communication pipe; 202. Side piston tube; 203. Side piston member; 204. Upper sealing cover; 3. Coaxial needle core member; 301. Lower sampling opening; 302. Upper handle; 4. Inner sampling needle core member; 401. Lower splitting knife ring; 402. Inner sampling hole; 403. Upper piston tube; 404. Upper piston member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0022] Embodiment 1: Please refer to Figures 1 to 8 : The present invention provides a sampling device that is convenient for separation, including: an outer positioning and fixing frame 1, a coaxial needle sheath member 2, a coaxial needle core member 3, and an inner sampling needle core member 4. A tightening screw 101 is screwed on the side of the outer positioning and fixing frame 1. Outer connecting rotating shafts 102 are fixedly arranged on both sides of the outer positioning and fixing frame 1. The outer connecting rotating shafts 102 are rotatably connected to an outer connecting rotating ring 107. The outer connecting rotating ring 107 is a semi-circular ring structure. The outer connecting rotating shaft 102 fixed in the middle of the outer connecting rotating ring 107 is rotatably connected to the head of a telescopic rod 103. The rear part of the telescopic rod 103 is slidably connected to the upper pipe fitting of an outer fixing frame 104. A lower fixing plate 105 is fixed at the lower end of the outer fixing frame 104. A lower fixing screw 106 is rotatably arranged at the lower end of the outer fixing frame 104. The tightening screw 101 screwed on the head of the telescopic rod 103 abuts against the outer connecting rotating shaft 102 of the outer connecting rotating ring 107 to fix the angle of the outer connecting rotating ring 107. The middle part of the lower fixing screw 106 is screwed to the lower fixing plate 105. The tightening screw 101 screwed on the upper part of the outer fixing frame 104 abuts against the telescopic rod 103 to fix the telescopic distance between the outer fixing frame 104 and the telescopic rod 103. The tightening screw 101 screwed on the outer connecting rotating ring 107 abuts against the outer connecting rotating shaft 102 of the outer positioning and fixing frame 1 to fix the angle of the outer positioning and fixing frame 1. The coaxial needle sheath member 2 axially penetrates and slides through the outer positioning and fixing frame 1. The coaxial needle sheath member 2 is a circular tube structure. A side communication pipe 201 is communicated and arranged on one side of the upper end of the coaxial needle sheath member 2. The side communication pipe 201 is fixedly communicated with a side piston pipe 202. A side piston member 203 slides inside the side piston pipe 202. The upper end of the coaxial needle sheath member 2 is screwed and sealed with an upper sealing cover 204. The coaxial needle sheath member 2 is first inserted into the human body, and the coaxial needle sheath member 2 is inserted into the shallow layer position of the tumor. Sampling operations are performed inside the coaxial needle sheath member 2. The coaxial needle sheath member 2 prevents blood and water generated by tumor sampling from flowing to the outside. Inside the coaxial needle sheath member 2, there is an axially sliding coaxial needle core member 3. The coaxial needle core member 3 has a cylindrical structure. At the lower end of the coaxial needle core member 3, there is a lower sampling opening 301 penetrating through. At the top of the coaxial needle core member 3, there is an upper handle 302 fixedly arranged. The upper handle 302 has a T-shaped structure. The upper handle 302 facilitates the pushing and pulling work with the inner sampling needle core member 4. The outer side of the coaxial needle core member 3 is in sliding fit with the inner wall of the coaxial needle sheath member 2. The coaxial needle core member 3 punctures deeper into the tumor. The inner sampling needle core member 4 moves for puncture along with the coaxial needle core member 3. Inside the coaxial needle core member 3, there is an axially sliding inner sampling needle core member 4. At the lower end of the inner sampling needle core member 4, there is a lower dividing knife ring 401 fixedly arranged. In the lower part of the inner sampling needle core member 4, there is an inner sampling hole 402 penetrating through. The upper end of the inner sampling needle core member 4 is fixedly connected and communicated with an upper piston tube 403. Inside the upper piston tube 403, there is an axially sliding upper piston member 404.

[0023] In the embodiment of the present disclosure, as Figure 1 , 5 , as shown in Figure 6, the lower dividing knife ring 401 is located at the lower side of the inner sampling hole 402. When the inner sampling needle core member 4 is inside the coaxial needle core member 3, the inner sampling hole 402 is aligned with the lower sampling opening 301. The lower dividing knife ring 401 is located at the lower side of the lower sampling opening 301. When the lower dividing knife ring 401 moves upward, it divides the tumor sample inside the inner sampling hole 402. After the inner sampling needle core member 4 is inserted into the tumor, the upper piston member 404 moves towards the side away from the inner sampling needle core member 4. The movement of the upper piston member 404 causes suction in the upper piston tube 403. The upper piston tube 403 is communicated with the inner sampling needle core member 4 to generate suction by inhalation. The suction of the inner sampling needle core member 4 pulls more tumor samples into the interior through the inner sampling hole 402, ensuring sufficient sampling each time.

[0024] In the embodiment of the present disclosure, as Figure 1 , 2 , as shown in the figure, when the coaxial needle sheath member 2 and the outer positioning and fixing frame 1 penetrate through, the tightening screw 101 on the side of the outer positioning and fixing frame 1 is in tight contact with the coaxial needle sheath member 2. The position of the coaxial needle sheath member 2 is fixed. The outer positioning and fixing frame 1 and the outer connecting rotating ring 107 adjust and fix the sampling angle along with the coaxial needle sheath member 2, eliminating the need for additional manual assistance by personnel to fix the angle of the coaxial needle sheath member 2.

[0025] In the embodiment of the present disclosure, as Figure 1 , 3As shown, when the upper sealing cover 204 and the coaxial needle sheath member 2 are screwed and sealed, the lower end of the side piston member 203 and the side communication pipe 201 and the side piston pipe 202 remain in a communicating state. The side piston member 203 moves away from the coaxial needle sheath member 2, and the side piston pipe 202 generates suction. The side piston pipe 202 communicates with the coaxial needle sheath member 2 through the side communication pipe 201 to generate suction. The bottom end of the coaxial needle sheath member 2 can adsorb and retain residues such as tumor blood and water generated during sampling inside the coaxial needle sheath member 2. The residues such as tumor blood and water move to the outside of the body along with the coaxial needle sheath member 2, avoiding the diffusion of residues such as tumor blood and water to the surrounding tissues outside the tumor, resulting in the growth of tumor cells on the surrounding tissues.

[0026] Embodiment 2: On the basis of Embodiment 1, a pulley is rotated on the upper handle 302. Through the cooperation of a pulley and a pull rope on the upper handle 302, pulling the pull rope downward is realized. The pull rope moves in an inverted U shape along the pulley, and the tail end of the pull rope pulls the inner sampling needle core member 4 to move downward. Through the downward movement of the pull rope and the tightening of the upper part of the upper handle 302, the upward movement operation of the inner sampling needle core member 4 is realized, achieving the single-handed operation of the personnel and making it more convenient for the personnel to use.

[0027] The working principle of this embodiment: During the sampling process of the tumor, the coaxial needle sheath member 2 is first inserted into the human body. The coaxial needle sheath member 2 is inserted into the shallow layer of the tumor, and sampling operations are carried out inside the coaxial needle sheath member 2. The coaxial needle sheath member 2 prevents blood and water generated during tumor sampling from flowing to the outside. The lower fixing screw 106 drives the lower fixing plate 105 to move. The lower fixing plate 105 of the outer fixing frame 104 and the lower fixing plate 105 of the lower fixing screw 106 move closer to clamp the bed cross bar in the middle for fixing operations. The outer positioning fixing frame 1 and the outer connection rotating ring 107 adjust and change the sampling angle along with the coaxial needle sheath member 2. The outer positioning fixing frame 1 and the outer connection rotating ring 107 are fixed at an angle through the tightening screw 101. The fixing of the outer positioning fixing frame 1 simultaneously fixes the sampling angle of the coaxial needle sheath member 2. The outer positioning fixing frame 1 fixes the axial position of the coaxial needle sheath member 2 through the tightening screw 101, eliminating the manual assistance of the personnel to fix the angle of the coaxial needle sheath member 2 and reducing the number of assisting personnel during the sampling process; Then, the coaxial needle core member 3 slides inside the coaxial needle sheath member 2. The coaxial needle core member 3 punctures deeper into the tumor. The inner sampling needle core member 4 moves along with the coaxial needle core member 3 during the puncture. After the inner sampling needle core member 4 is inserted into the tumor, the upper piston member 404 moves towards the side away from the inner sampling needle core member 4. The movement of the upper piston member 404 causes the upper piston tube 403 to generate suction. The upper piston tube 403 is connected to the inner sampling needle core member 4 to inhale and generate suction. The suction of the inner sampling needle core member 4 pulls more tumor samples into the interior through the inner sampling holes 402. The active control operation enables obtaining more tumor samples at one time, eliminating the need for adjusting back and forth for each sampling, ensuring sufficient sampling each time, and reducing the number of samplings. By pulling the inner sampling needle core member 4 upward, the lower splitting knife ring 401 moves upward to split the tumor samples inside the inner sampling holes 402, and the tumor samples inside the inner sampling holes 402 are retained; After the inner sampling needle core member 4 finishes sampling, the inner sampling needle core member 4 moves to the outside of the coaxial needle core member 3. The upper piston member 404 moves towards the side of the inner sampling needle core member 4 and approaches it. The movement of the upper piston member 404 causes the upper piston tube 403 to exhale towards the side of the inner sampling needle core member 4. The upper piston tube 403 is connected to the inner sampling needle core member 4 to exhale and generate a thrust force to push the tumor tissue samples inside the inner sampling holes 402 outwards, facilitating the separation operation of the tumor tissue samples and eliminating the operation of personnel picking out the samples with a needle; After sampling is completed, the upper end of the coaxial needle sheath member 2 is screwed and sealed with the upper sealing cover 204. The side piston member 203 moves away from the coaxial needle sheath member 2, and the side piston tube 202 generates suction. The side piston tube 202 is connected to the coaxial needle sheath member 2 through the side connecting tube 201 to generate suction. The bottom end of the coaxial needle sheath member 2 can adsorb and retain residues such as tumor blood and water generated during sampling inside the coaxial needle sheath member 2. The residues such as tumor blood and water move to the outside of the body along with the coaxial needle sheath member 2, avoiding the situation where the residues such as tumor blood and water spread towards the surrounding tissues outside the tumor, resulting in the growth of new tumors due to new diffusion.

[0028] In this article, the following points need to be noted: 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure. Other structures can refer to the general design.

[0029] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0030] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A sampling device for convenient separation, comprising: An external positioning fixing frame (1), a coaxial needle sheath component (2), a coaxial needle core component (3) and an internal sampling needle core component (4); characterized in that the coaxial needle sheath component (2) is axially penetrated and slidably provided on the external positioning fixing frame (1), the coaxial needle core component (3) is axially slidably provided inside the coaxial needle sheath component (2), the internal sampling needle core component (4) is axially slidably provided on the inner side of the coaxial needle core component (3), a side connecting tube (201) is connected and provided on one side of the upper end of the coaxial needle sheath component (2), the side connecting tube (201) and the side piston tube (202) are connected and fixed, a side piston component (203) is slidably provided inside the side piston tube (202), and the upper end of the coaxial needle sheath component (2) and the upper sealing cover (204) are threadedly sealed.

2. A conveniently separated sampling device according to claim 1, characterized in that: The side of the external positioning fixing frame (1) is screwed with a tightening screw (101), and both sides of the external positioning fixing frame (1) are fixedly provided with an external connecting shaft (102), the external connecting shaft (102) and the external connecting rotating ring (107) are rotatably connected, the external connecting shaft (102) fixed in the middle of the external connecting rotating ring (107) and the front end of the telescopic rod (103) are rotatably connected, the rear of the telescopic rod (103) and the upper part of the external fixing frame (104) are slidably connected, the lower end of the external fixing frame (104) is fixed with a lower fixing plate (105), and the lower end of the external fixing frame (104) is rotatably connected with a lower fixing screw (106).

3. A conveniently separated sampling device according to claim 2, characterized in that: The tightening screw (101) screwed on the head end of the telescopic rod (103) and the external connection shaft (102) of the external connection rotating ring (107) are tightened, the middle part of the lower fixing screw (106) is screwed with a lower fixing plate (105), the tightening screw (101) screwed on the upper part of the external fixing frame (104) and the telescopic rod (103) are tightened, and the tightening screw (101) screwed on the external connection rotating ring (107) and the external connection shaft (102) of the external positioning fixing frame (1) are tightened.

4. A conveniently separated sampling device according to claim 1, characterized in that: The lower end of the coaxial needle core piece (3) is penetrated by a lower sampling opening (301), the top of the coaxial needle core piece (3) is fixedly provided with an upper handle (302), and the outer side of the coaxial needle core piece (3) and the inner wall of the coaxial needle sheath piece (2) are slidably fitted.

5. A conveniently separated sampling device according to claim 4, characterized in that: A lower splitting knife ring (401) is fixedly provided at the lower end of the inner sampling needle core member (4), an inner sampling hole (402) is penetrated through the lower part of the inner sampling needle core member (4), the upper end of the inner sampling needle core member (4) is connected and fixed to the upper piston tube (403), and an upper piston member (404) is axially slidable on the inner side of the upper piston tube (403).

6. A conveniently separated sampling device according to claim 5, characterized in that: The lower split knife ring (401) is located at the lower side of the inner sampling hole (402). When the inner sampling needle core piece (4) is inside the coaxial needle core piece (3), the inner sampling hole (402) and the lower sampling opening (301) are aligned, and the lower split knife ring (401) is located at the lower side of the lower sampling opening (301).

7. A conveniently separated sampling device according to claim 2, characterized in that: When the coaxial needle sheath component (2) and the external positioning fixing frame (1) are inserted, the tightening screw (101) on the side of the external positioning fixing frame (1) and the coaxial needle sheath component (2) are in tight contact, and the position of the coaxial needle sheath component (2) is fixed.

8. The convenient separation sampling device according to claim 1, characterized in that: When the upper sealing cover (204) and the coaxial needle sheath component (2) are threadedly sealed, the lower end of the side piston component (203) and the side connecting tube (201) and the side piston tube (202) remain in a connected state.

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