CN220625870U - Trace medicament sampling equipment - Google Patents

Abstract

The utility model relates to the technical field of sampling equipment, and discloses micro-medicament sampling equipment, which comprises the following components: the bottom of the sampling tube is provided with a sampling head, the top of the sampling tube is provided with a baffle, a piston is arranged in the sampling head, the top of the piston is provided with a pull rod penetrating out of the baffle, a supporting plate is arranged on the pull rod in the sampling tube, a first elastic piece is arranged between the supporting plate and the baffle, the side wall of the pull rod is provided with a rack, and the top of the sampling tube is provided with a limiting mechanism; the driving plate is hinged on the sampling tube, a second elastic piece is connected between the driving plate and the side wall of the sampling tube, the driven plate is hinged at the free end of the driving plate, a third elastic piece is arranged between the driven plate and the driving plate, a stop block is arranged on the inner side of the driving plate, which is close to the hinged position of the driven plate, a limit tooth is arranged on the driven plate, and a release plate is fixed at one end of the driving plate, which is far away from the driven plate, and the device can carry out one-hand operation through a drawing part and a limit mechanism, so that the operation convenience of the sampler is improved, the sampling precision is improved, the reliability of the whole device is high, and the cost is low.

Description

A kind of micromedicine sampling equipment

Technical field

The utility model relates to the technical field of sampling equipment, in particular to a trace pharmaceutical sampling equipment.

Background technique

Pharmacy is a health care industry that connects health science and chemical science. It is responsible for ensuring the safe and effective use of drugs; pharmacy mainly studies the source, processing, properties, effects, analysis, identification, preparation, production, storage and search of drugs. (including synthetic) new drugs; the main task is to continuously provide more effective drugs and improve drug quality, ensure drug safety, so that patients can treat or cure diseases in a way that minimizes harm and maximizes benefits; research into making drugs into appropriate dosage forms , ensuring that high-quality preparations meet the needs of medical and health work. In the process of drug preparation and research, accurately controlling the dosage of each link of the reaction and accurately extracting trace amounts of pharmaceuticals according to the experimental preset process is one of the key issues that the laboratory must solve and is a key link in determining the experimental results.

At present, when conducting pharmaceutical experiments to sample trace amounts of pharmaceuticals, the method of using an air bag with a dropper or a piston with a syringe jacket is often used for sampling. However, when these two sampling devices are actually used, it is found that the method of using the air bag with a dropper has a negative impact on the air bag. The air flow control cannot be adjusted, the amount of sample sucked into the dropper cannot be accurately controlled, and the sampling accuracy is poor. However, the sampler composed of a piston and a syringe jacket requires both hands to perform the sampling operation. One hand stabilizes the syringe and the other hand pulls the piston. The operation method is extremely inconvenient, making it difficult to control the sampling volume, and the sampling accuracy is poor. The existence of errors can easily affect the accuracy of the test results, and the pharmaceutical bottles cannot be supported during the sampling process, and it is also easy to cause the pharmaceutical bottles to tip over. Although there are some high-precision pipetting guns on the market, they are very expensive and the cost of equipping them in large quantities is high. To this end, we propose a microagent sampling device.

Utility model content

The utility model proposes a micro-amount medicine sampling equipment. The micro-amount medicine sampling equipment is provided with a pump-out component and a limiting mechanism that can be operated with one hand, thereby improving the operational convenience and sampling accuracy of the piston sampler, and the entire equipment It is a purely mechanical structure with high reliability and low cost to solve the above-mentioned shortcomings in the prior art.

The technical solution of the utility model is: a trace pharmaceutical sampling equipment, including:

The sampling tube has a sampling head at the bottom, a baffle at the top, and a piston inside. The top of the piston is equipped with a pull rod that goes out and out of the baffle. There is a support plate on the pull rod in the sampling pipe. There is a support plate between the support plate and the baffle. A first elastic member is provided, the side wall of the pull rod is provided with a rack with downward teeth, and the top of the sampling tube is provided with a limiting mechanism;

The extraction component includes: an active plate, a driven plate and a release plate. The active plate is hinged on the side wall of the sampling tube. A second elastic member is connected between the active plate and the side wall of the sampling tube. The driven plate The plate is hinged at the free end of the driving plate. There is a third elastic member between the driven plate and the driving plate. There is a stopper on the inside of the driving plate near the hinge of the driven plate. The free end of the driven plate is equipped with a rack relative to the rack. The matching teeth are inclined upward limiting teeth, and the release plate is inclined at an end of the driving plate away from the driven plate.

Preferably, the limiting mechanism includes: a semicircular plate, a threaded rod and a limiting baffle. The semicircular plate is arranged at the top of the sampling tube. A fixed block is provided on the side of the semicircular plate away from the sampling tube. The side of the semicircular plate is There is a scale mark on the edge, and the threaded rod is rotatably connected between the inner baffle and the fixed block of the semicircular plate. The end of the threaded rod passes through the fixed block, and a knob is provided at the end of the threaded rod. The limiting baffle It is arranged in a semi-circular plate, the limit baffle is provided with a threaded hole matching the threaded rod, and the end of the pull rod is provided with a pressure plate matching the limit baffle.

Preferably, the pull rod is a square rod, and the baffle is provided with a square hole for the pull rod to pass through. A cylindrical roller is rotatably connected to the inner wall of the square hole away from the rack on the pull rod. The roller fits the side wall of the pull rod.

Preferably, one end of the driven plate away from the driving plate is hinged to a limiting plate, and the side of the limiting plate away from the hinged end is provided with limiting teeth that match the rack and are inclined upward. There is a limit block between the side of the plate away from the limit teeth and the driven plate.

Preferably, the side wall of the sampling head is provided with a strip hole, the inner wall of the sampling head is provided with a slot corresponding to the strip hole, and a clamping plate is installed in the strip hole, and the clamping plate A rubber layer is provided on the side wall of the sampling head, a push plate is provided at the end of the outer clamping plate of the sampling head, and a capillary sampling tube is detachably connected to the end of the sampling head.

Preferably, the semicircular plate is provided with a chute, and the bottom of the limiting baffle is provided with a ball groove. Balls matching the chute are installed in the ball groove.

Preferably, the side of the limiting plate away from the limiting teeth is provided with two connectors, a connecting rod is provided between the connectors, and the end of the driven plate away from the driving plate is provided with a third hole for the connecting rod to pass through. A connecting hole, a connecting groove is provided in the middle of the connecting hole on the driven plate, and a torsion spring is provided on the connecting rod in the connecting groove.

Preferably, two mounting plates are symmetrically provided on the side wall of the sampling tube, the active plate is arc-shaped and hinged between the mounting plates, and a protective pad is provided on the outer wall of the active plate.

Preferably, the first elastic member is a compression spring set on the pull rod, the second elastic member is a compression spring, and the third elastic member is a tension spring.

Preferably, the bottom of the inner cavity of the sampling tube is tapered, and the bottom of the piston is a tapered piston that matches the bottom of the inner chamber of the sampling tube and is made of rubber.

Beneficial effects of this utility model:

The utility model provides a micro-amount medicine sampling device. When the micro-amount medicine sampling equipment is used, the limit mechanism is first adjusted according to the demand for the sampling volume, and then the sampling operation is performed. During sampling, the medicine bottle is supported with one hand. Hold the sampling tube with one hand, gradually extend the capillary sampling tube below the liquid level in the sampling bottle, and then pull the active plate with your hand. At this time, the active plate drives the limit plate end of the driven plate to move upward, and is set at the slave plate. The limit teeth on the upper limit plate of the moving plate mesh with the limit teeth on the pull rod to pull the pull rod to move upward and pull the piston to complete the suction of the medicine. You can repeatedly relax and press the active plate until the pull rod is limited by the limit mechanism, that is, the sampling of the medicinal liquid is completed. When it is necessary to release the medicinal solution in the sampling tube, the hand holding the sampling tube moves downward and presses the release plate. Overcoming the tension of the second elastic member, it continues to open until the limit teeth on the limit plate release the limit on the pull rod. The pull rod is under the action of the first elastic member and due to the friction of the inner wall of the piston hand sampling tube. , slowly push the piston downward through the pull rod, thereby slowly discharging trace amounts of medicine from the sampling tube to the corresponding experimental equipment. Compared with the existing sampling method of air bag plus dropper or piston plus syringe jacket, this micro-medicine sampling equipment has higher sampling accuracy and is simple and convenient to operate. It can complete the suction work of medicine with one hand and avoids the need for medicine bottles. The occurrence of tipping ensures the safety of the experiment, and the entire device has a purely mechanical structure. Compared with the expensive pipetting guns on the existing market, it has high reliability and low production cost, and is suitable for large-scale equipment during experiments. In addition, the micro-amount sampling equipment is equipped with a card plate to ensure that dripping does not occur during the pipetting process. It is also equipped with a cylindrical roller that matches the pull rod and a ball groove that matches the semi-circular plate, ensuring that the entire device runs smoothly and operates smoothly. Convenient.

Description of the drawings

Figure 1 is a schematic diagram of the front cross-sectional structure of the utility model;

Figure 2 is a schematic cross-sectional structural diagram of the front view of the extraction component of the present utility model;

Figure 3 is a schematic diagram of the detailed structure of position A of the utility model from the front view;

Figure 4 is a schematic structural diagram of a top view of the sampling tube of the present utility model;

Figure 5 is a schematic diagram of the detailed structure of position B in the front view of the present utility model;

Figure 6 is a schematic side view of the structure of the utility model;

Figure 7 is a schematic diagram of the detailed structure of the utility model at point C in side view.

Explanation of reference symbols:

1. Sampling tube; 11. Sampling head; 111. Strip hole; 112. Card plate; 12. Baffle; 121. Square hole; 122. Cylindrical roller; 13. Tie rod; 131. Support plate; 132. First elasticity 133. Rack; 14. Installation plate; 2. Pumping and extraction parts; 21. Active plate; 211. Second elastic member; 22. Followed plate; 221. Third elastic member; 222. Stopper; 223. Limiting tooth; 23. Release plate; 24. Limiting plate; 241. Limiting block; 3. Limiting mechanism; 31. Semi-circular plate; 311. Chute; 32. Threaded rod; 33. Limiting baffle; 331 , ball.

Detailed ways

A specific embodiment of the present utility model will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific embodiment.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Axis", "Radial", "Circumferential" The orientation or positional relationship indicated by "" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the technical solution of the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have specific characteristics. Orientation, construction and operation in specific orientations and therefore should not be construed as limitations of the invention.

As shown in Figures 1 to 7, a micro-agent sampling device includes:

The sampling pipe 1 has a sampling head 11 at the bottom, a baffle 12 at the top, and a piston inside. The top of the piston is provided with a pull rod 13 that goes out and out of the baffle 12. The pull rod 13 in the sampling pipe 1 is provided with a support plate. 131. A first elastic member 132 is provided between the support plate 131 and the baffle 12. A rack 133 with downward teeth is provided on the side wall of the pull rod 13. A limiting mechanism 3 is also provided on the top of the sampling tube 1. The limiting mechanism 3 limits the range of movement of the pull rod 13, so that the sampling volume of the pharmaceutical sampling equipment can be adjusted;

The pumping and discharging part 2 includes: an active plate 21, a driven plate 22 and a release plate 23. The active plate 21 is hinged on the side wall of the sampling tube 1. There is a third connection between the active plate 21 and the side wall of the sampling tube 1. Two elastic members 211. The driven plate 22 is hinged at the free end of the active plate 21. A third elastic member 221 is provided between the driven plate 22 and the active plate 21. The inner side of the active plate 21 is located near the hinge of the driven plate 22. There is a stopper 222. The arrangement of the stopper 222 prevents the driven plate 22 from being excessively bent under the action of the third elastic member 221, so that the limiting teeth 223 cannot fully mesh with the rack 133. The driven plate 22 The free end is provided with limiting teeth 223 with teeth that match the rack 133 and are inclined upward. The release plate 23 is inclined toward the side away from the sampling tube 1 and is provided at an end of the driving plate 21 away from the driven plate 22. The position teeth 223 can fit into the rack 133 and slide downward.

Further, the limiting mechanism 3 includes: a semi-circular plate 31, a threaded rod 32 and a limiting baffle 33. The semi-circular plate 31 is provided at the top of the sampling tube 1, and there is a Fixed block, the side of the semi-circular plate 31 is provided with a scale line, and the side of the scale line is provided with a corresponding scale value. The scale value indicates that the position is limited here, and the medicament can be sucked in the sampling tube 1 The threaded rod 32 is rotatably connected between the inner baffle 12 of the semicircular plate 31 and the fixed block. The end of the threaded rod 32 passes through the fixed block, and a knob is provided at the end of the threaded rod 32. The knob is provided with a knob in the circumferential direction. Anti-slip patterns are provided to prevent slipping when rotating the knob. The limit baffle 33 is arranged in the semicircular plate 31. The limit baffle 33 is provided with a threaded hole that matches the threaded rod 32. The end of the pull rod 13 The bottom is provided with a pressure plate that matches the limiting baffle 33.

Further, the pull rod 13 is a square rod, and the baffle 12 is provided with a square hole 121 for the pull rod 13 to pass through. The inner wall of the square hole 121 is rotatably connected to the side away from the rack 133 on the pull rod 13. Cylindrical roller 122. The cylindrical roller 122 is in contact with the side wall of the pull rod 13. Due to the use of the extraction part 2 during the process of lifting the pull rod 13, the driven plate 22 will produce a certain lateral movement on the pull rod 13. Pressure, the arrangement of the cylindrical roller 122 makes the upward movement of the pull rod 13 not affected by the friction of the side wall of the square hole 121, and the upward movement is smoother.

Further, one end of the driven plate 22 away from the driving plate 21 is hinged to a limiting plate 24, and the limiting plate 24 is provided with an upward limiting tooth on the side away from the hinged end that matches the rack 133. Teeth 223, the setting of the limit plate 24 can make the end of the driven plate 22 away from the driving plate 21 move up and down. The limit teeth 223 are always fully engaged with the rack 113, ensuring that the lifting rod 13 of the extraction part 2 is Stability, a limit block 241 is provided between the side of the limit plate 24 away from the limit teeth and the driven plate. The setting of the limit block 241 prevents the limit plate 24 from continuing to rotate downward. In the working state, the limit teeth 223 is difficult to mesh with the rack 113.

Further, the side wall of the sampling head 11 is provided with a strip hole 111, the inner wall of the sampling head 11 is provided with a slot corresponding to the strip hole 111, and a clamping plate 112 is installed in the strip hole 111. , a rubber layer is provided on the side wall of the clamping plate 112, a push plate is provided at the end of the outer clamping plate 112 of the sampling head 11, a capillary sampling tube is detachably connected to the end of the sampling head 11, and the clamping plate The setting of 112 prevents dripping from causing contamination during the transfer process and affecting the accuracy of the liquid amount.

Further, the semicircular plate 31 is provided with a chute 311, and the bottom of the limiting baffle 33 is provided with a ball groove. Balls 331 matching the chute 311 are installed in the ball groove. The chute 311 is installed in the ball groove. 311 and the arrangement of the ball grooves 311 and the balls 331 make the limiting baffle 33 slide more smoothly in the semicircular plate 31 after the knob is rotated.

Further, the limiting plate 24 is provided with two opposite connectors on the side away from the limiting teeth 223, and a connecting rod is provided between the connectors. The driven plate 22 is provided with a connecting rod on the end away from the active plate 21. The first connecting hole for the connecting rod to pass through, the driven plate 22 is provided with a connecting groove in the middle of the connecting hole, and a torsion spring is provided on the connecting rod in the connecting groove. The setting of the torsion spring can make the limiting plate 223 always fits the driven plate 22 downward, and cooperates more closely with the rack 133 during the working process.

Further, two mounting plates 14 are symmetrically provided on the side walls of the sampling tube 1. The active plate 21 is arc-shaped and hinged between the mounting plates 14. A protective pad is provided on the outer wall of the active plate 21. , the arc-shaped active plate 21 is more comfortable to hold, and the setting of the protective pad can not only play an anti-slip effect, but also ensure the comfort of holding.

Further, the first elastic member 132 is a compression spring set on the pull rod 13, and the second elastic member 211 is a compression spring. The first elastic member 132 may also be provided between the support plate 131 and the baffle 12. The two ends of the second elastic member 211 are respectively hinged between the sampling tube 1 and the active plate 21. The second elastic member 211 provides tension to the active plate 21 during the actual suction operation. It also provides a certain tension when discharging the medicine. The third elastic member 221 is a tension spring. The coils of the tension spring are usually close together and there is no gap. This is between the active plate 21 and the driven plate 22. To provide pulling force, the third elastic member 221 can also be replaced by a torsion spring provided between the active plate 21 and the driven plate 22. In the actual production process, it can be selected and used according to the situation without violating the working principle. .

Furthermore, the bottom of the inner cavity of the sampling tube 1 is tapered, and the bottom of the piston is a tapered shape that matches the bottom of the inner chamber of the sampling tube 1. The arrangement of the tapered shape makes the measuring range of the sampling tube 1 smaller in the early stage and the sampling accuracy is smaller. Higher, ensuring that the chemicals in the sampling tube 1 can be completely drained during the liquid discharge process. The piston is made of rubber, and there is a certain friction between the movement of the piston and the side wall of the sampling tube 1. The sampling tube 1 is Transparent material, the sampling tube 1 is provided with a volume scale mark, or the sampling tube 1 is provided with a transparent window, and the transparent window is provided with a volume scale mark. During the actual operation, the scale mark can be used as a reference to understand the sampling volume at all times. , providing reference for hand operations.

How to use this embodiment:

The utility model provides a micro-agent sampling device. When the micro-agent sampling device is used, the capillary sampling tube is first installed on the sampling head, and then the push plate is pulled outward to open the clamping plate to block the sampling head, and then the sampling head is blocked according to the The amount of drug to be sampled is rotated with the scale line on the semicircular plate as a reference. The knob drives the threaded rod to rotate. The rotation of the threaded rod drives the limit baffle to slide in the semicircular plate. When it slides to the appropriate scale line position, stop rotating the knob, and then Pharmaceutical sampling can then be carried out. When sampling, support the medicine bottle with one hand and hold the sampling tube with the other hand. Gradually extend the capillary sampling tube below the liquid level in the sampling bottle, and then pull the active plate with your hand. At this time, the active plate drives the driven plate. The end of the limit plate moves upward, and the limit teeth provided on the upper limit plate of the driven plate mesh with the limit teeth on the pull rod to pull the pull rod to move upward. The pull rod moves upward smoothly with the cooperation of the cylindrical roller, and pulls the pull rod upward. piston to complete the aspiration of the medicine.

If a trace amount of the sampling agent is pulled at one time and the pressure plate on the pull rod resists the limit baffle, the sampling work is completed. At this time, the capillary sampling tube is pulled out from the reagent bottle, and the push plate is pressed with one hand to cause the clamping plate to block the sampling head. To avoid dripping of the medicinal solution, the hand holding the sampling tube can relax the pressure on the active plate. The active plate opens to a certain range under the action of the second elastic part, and the driven plate opens to a certain range under the action of the third elastic part. , the end of the limit plate moves downward, and the teeth on the limit plate re-engage with the rack on the pull rod. When it is necessary to release the medicine in the sampling tube, pull the push plate to release the blocking of the sampling head by the clamp plate, and then The hand holding the sampling tube moves downward and presses the release plate to overcome the tension of the second elastic member so that it continues to open until the limiting teeth on the limiting plate release the limit on the pull rod, and the pull rod acts on the first elastic member downward, and due to the friction of the inner wall of the piston hand sampling tube, the piston is slowly pushed downward through the pull rod, thereby slowly discharging trace amounts of medicine from the sampling tube to the corresponding experimental equipment.

If a little more medicine is sampled, hold the active plate once and push the pull rod to move upward through transmission. If the pressure plate on the pull rod cannot withstand the limit baffle, you can quickly relax the pressure on the active plate at this time. Under the action of the third elastic member The driven plate will drive the limit plate to move downward along the rack on the pull rod. At this time, the pull rod will also slowly move downward under the action of the first elastic member and the friction between the piston and the inner wall of the sampling tube. However, when the active plate is quickly relaxed and tightened, the limit teeth on the limit plate can still engage with the rack to lift the pull rod again until the pressure plate on the pull rod contacts the limit baffle. To complete the suction of the medicine, it is enough to discharge a little more medicine in the same way as the above operation.

The above disclosures are only a few specific embodiments of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that those skilled in the art can think of should fall within the protection scope of the present utility model.

Claims (10)

1. A micromedicine sampling equipment, characterized in that it includes: The sampling tube (1) is provided with a sampling head (11) at the bottom, a baffle (12) at the top, and a piston inside. The top of the piston is provided with a pull rod (13) that goes out of the baffle (12) for sampling. A support plate (131) is provided on the inner tie rod (13) of the tube (1), a first elastic member (132) is provided between the support plate (131) and the baffle (12), and a first elastic member (132) is provided on the side wall of the tie rod (13). There is a rack (133) with downward teeth, and a limiting mechanism (3) is provided on the top of the sampling tube (1); The extraction part (2) includes: an active plate (21), a driven plate (22) and a release plate (23). The active plate (21) is hinged on the side wall of the sampling tube (1), and the active plate (21) is hinged on the side wall of the sampling tube (1). 21) is connected to the side wall of the sampling tube (1). The driven plate (22) is hinged at the free end of the active plate (21). The driven plate (22) is connected to the active plate (21). A third elastic member (221) is provided between the plates (21), a stopper (222) is provided on the inside of the driving plate (21) near the hinge of the driven plate (22), and a stopper (222) is provided on the free end of the driven plate (22). The teeth matching the rack (133) are inclined upward limiting teeth (223), and the release plate (23) is inclined at an end of the driving plate (21) away from the driven plate (22). 2. A micromedicine sampling device according to claim 1, characterized in that the limiting mechanism (3) includes: a semicircular plate (31), a threaded rod (32) and a limiting baffle (33), The semicircular plate (31) is arranged at the top of the sampling tube (1). There is a fixed block on the side of the semicircular plate (31) away from the sampling tube (1). There are scale marks on the sides of the semicircular plate (31). The threaded rod (32) is rotatably connected between the inner baffle (12) of the semicircular plate (31) and the fixed block. The end of the threaded rod (32) passes through the fixed block, and a knob is provided at the end of the threaded rod (32). The limit baffle (33) is arranged in the semicircular plate (31). The limit baffle (33) is provided with a threaded hole that matches the threaded rod (32). The end of the pull rod (13) is provided with a threaded hole. A pressure plate that matches the limit baffle (33). 3. A micromedicine sampling device according to claim 1, characterized in that the pull rod (13) is a square rod, and the baffle (12) is provided with a square hole for the pull rod (13) to pass through. (121), a cylindrical roller (122) is rotatably connected to the inner wall of the square hole (121) on the side away from the rack (133) on the pull rod (13). The cylindrical roller (122) and the pull rod (13) The side walls fit together. 4. A micromedicine sampling device according to claim 1, characterized in that one end of the driven plate (22) away from the active plate (21) is hinged to a limiting plate (24), and the limiting plate The side of (24) away from the hinged end is provided with limiting teeth (223) with teeth that match the rack (133) and tilt upward. The side of the limiting plate (24) away from the limiting teeth is between the driven plate and the side of the limiting plate (24). There are limited blocks (241) between them. 5. A kind of micromedicine sampling equipment according to claim 1, characterized in that, the side wall of the sampling head (11) is provided with a strip hole (111), and the inner wall of the sampling head (11) is provided with a strip hole (111). A clamping slot corresponding to the strip hole (111). A clamping plate (112) is installed in the strip hole (111). A rubber layer is provided on the side wall of the clamping plate (112). The sampling head (11 ) The end of the outer clamping plate (112) is provided with a push plate, and the end of the sampling head (11) is detachably connected to a capillary sampling tube. 6. A micromedicine sampling equipment according to claim 2, characterized in that a chute (311) is provided in the semicircular plate (31), and a ball is provided at the bottom of the limiting baffle (33). The ball groove is equipped with balls (331) that match the chute (311). 7. A micromedicine sampling device as claimed in claim 4, characterized in that the limiting plate (24) is provided with two connectors on a side away from the limiting teeth (223), and there are two connectors between the connectors. There is a connecting rod, and the end of the driven plate (22) away from the driving plate (21) is provided with a first connecting hole for the connecting rod to pass through. The middle position of the connecting hole on the driven plate (22) is provided with a connecting groove. A torsion spring is provided on the connecting rod in the slot. 8. A micromedicine sampling device according to claim 1, characterized in that two mounting plates (14) are symmetrically provided on the side walls of the sampling tube (1), and the active plate (21) is The arc is hinged between the mounting plates (14), and a protective pad is provided on the outer wall of the active plate (21). 9. A micromedicine sampling device according to claim 1, characterized in that the first elastic member (132) is a compression spring set on the pull rod (13), and the second elastic member (211) is a compression spring. Spring, the third elastic member (221) is a tension spring. 10. A kind of micromedicine sampling equipment as claimed in claim 1, characterized in that the bottom of the inner cavity of the sampling tube (1) is tapered, and the bottom of the piston is matched with the bottom of the inner cavity of the sampling tube (1). Tapered, the piston is made of rubber.