Miniature micro-injection and sampling device

Abstract

The invention discloses a miniature micro-injection and sampling device which comprises a liquid storage device and a power device, a mounting seat is fixed at one end of the power device, the liquid storage device is detachably mounted on the mounting seat, the liquid storage device comprises a liquid storage cylinder and a piston movably arranged in the liquid storage cylinder, and the power device is used for driving the piston to do reciprocating rectilinear motion in the liquid storage cylinder; the power device is provided with a push-pull rod, one end of the push-pull rod is provided with a piston locking mechanism, the piston locking mechanism comprises a locking block and a locking reed, the end, facing the piston locking mechanism, of the piston is provided with an assembling groove with an internal thread, and the piston is locked in the assembling groove in the process that the power device drives the push-pull rod to stretch out towards the liquid storage device. The push-pull rod can push the locking block and the locking reed to extend into the assembling groove, and meanwhile the locking block can open the locking reed so that the locking reed can be clamped with the internal thread to achieve locking. The device has the injection and sampling functions, the piston and the liquid storage device can be quickly and automatically locked, and the operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection and sampling devices, in particular to a micro injection and sampling device. Background Art

[0002] In today's medical field, the accuracy and efficiency of microinjection and sampling operations play a vital role in the diagnosis and treatment of diseases and the progress of medical research. However, existing microinjection devices or microsampling devices still have obvious deficiencies in meeting these requirements.

[0003] Whether using a microinjection device for microinjection or a microsampling device for microsampling, the power device needs to be connected to the piston of the reservoir in advance. The traditional connection method is usually to install the locking piston manually, which has many defects. Common problems include slow locking speed, cumbersome operation and poor locking stability, which makes it difficult for medical staff to quickly and accurately fix the piston position during injection or sampling, and may even cause contamination. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a miniature micro-injection and sampling device to overcome the defects of the existing micro-injection and sampling device that the piston is locked manually, resulting in slow locking speed, complicated operation and poor locking stability.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a micro-micro injection and sampling device, comprising: a liquid reservoir and a power device, one end of the power device is fixed with a mounting seat, the liquid reservoir is detachably mounted on the mounting seat, the liquid reservoir comprises a liquid storage cylinder and a piston movably built in the liquid storage cylinder, and the power device is used to drive the piston to perform reciprocating linear motion in the liquid storage cylinder; the power device is provided with a push-pull rod, one end of the push-pull rod is provided with a piston locking mechanism, the piston locking mechanism comprises a locking block and a locking spring, the end of the piston facing the piston locking mechanism is provided with an assembly groove with an internal thread, in the process of the power device driving the push-pull rod to extend toward the liquid reservoir, the push-pull rod can push the locking block and the locking spring into the assembly groove, and at the same time, the locking block can stretch the locking spring so that the locking spring is engaged with the internal thread to achieve locking.

[0006] As a further improvement of the present invention, the locking spring is U-shaped, and a receiving groove is provided at one end of the push-pull rod, and the locking spring is installed in the receiving groove; the locking spring is provided with two opposite clamping springs, and the two clamping springs are provided with serrated teeth on the outer sides facing away from each other, and the locking block is located between the two clamping springs, and the locking block is used to push the two clamping springs to elastically deform in a direction away from each other, so that the teeth are engaged with the internal thread.

[0007] As a further improvement of the present invention, the two clamping springs are provided with a first inclined surface on their inner side surfaces facing each other, and the locking block is provided with two second inclined surfaces corresponding to the two first inclined surfaces one by one, and the locking block relies on the cooperation between the second inclined surface and the first inclined surface to push the two clamping springs to elastically deform in a direction away from each other.

[0008] As a further improvement of the present invention, a through hole is provided on the mounting seat, one end of the push-pull rod passes through the through hole and is connected to the piston through the piston locking mechanism; the two clamping springs are also provided with bulges on the outer sides facing away from each other, and the two bulges protrude from the outer peripheral surface of the push-pull rod. In the process of the power device driving the push-pull rod to drive the piston locking mechanism to retract, the through hole squeezes the two bulges so that the two clamping springs move toward each other, thereby causing the locking teeth to disengage from the internal thread.

[0009] As a further improvement of the present invention, a spring is installed on the locking block, and when the power device drives the push-pull rod to drive the piston locking mechanism to move toward the liquid reservoir, the locking block abuts against the piston through the spring; the locking block is provided with two elastic limiting legs distributed in an "eight" shape at the end facing away from the piston, and the push-pull rod is provided with two inclined grooves, and the two limiting legs are inserted into the two inclined grooves one by one, and when the piston is locked, the two limiting legs protrude from the corresponding inclined grooves from the outer circumferential surface of the push-pull rod.

[0010] As a further improvement of the present invention, one end of the push-pull rod is further provided with a guide groove which is distributed in a "cross" shape with the accommodating groove, and the locking block is provided with a guide block which is slidably fitted in the guide groove.

[0011] As a further improvement of the present invention, a driving device is installed on the push-pull rod, and the driving device is provided with a driving shaft. The driving shaft is fixedly connected to the locking block, and the driving device is used to drive the locking block to move axially through the driving shaft.

[0012] As a further improvement of the present invention, the mounting seat is provided with a positioning groove, and the liquid storage cylinder is installed in the positioning groove; the mounting seat is provided with locking sliders on both sides of the positioning groove, and the two locking sliders are provided with arc-shaped bayonet holes on the sides facing each other, and the liquid reservoir has two states, namely a locked state: the arc-shaped bayonet holes of the two locking sliders are just stuck on the outer peripheral wall of the liquid storage cylinder, and an unlocked state: the upper parts of the arc-shaped bayonet holes of the two locking sliders are opened in a direction away from each other, and at the same time, the lower parts of the arc-shaped bayonet holes of the two locking sliders lift up the liquid storage cylinder.

[0013] As a further improvement of the present invention, the locking slider is rotatably mounted on the mounting seat via a pin shaft, and one of the locking slider and the mounting seat is installed with a ball screw, and the other is provided with a locking groove and an unlocking groove. When the locking slider rotates around the pin shaft, the ball screw can slide from one of the locking groove and the unlocking groove to the other, thereby switching the liquid reservoir between a locked state and an unlocked state.

[0014] As a further improvement of the present invention, the power device includes a base, a motor fixed on the base, a screw connected to the motor, and a drive block sleeved on the screw, and the push-pull rod is connected to the drive block through a pull pressure sensor.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention provides a miniature micro-injection and sampling device. A piston locking mechanism is installed on a push-pull rod. When a power device drives the push-pull rod to extend toward a liquid reservoir, a locking block cooperates with a locking spring to realize rapid and automatic locking of the piston. This not only improves operating efficiency and saves time and steps for manually operating and locking the piston, so that medical staff can perform injection or sampling operations more quickly, especially in emergency situations, which can speed up the medical process. It can also enhance accuracy, ensure that the piston is accurately and automatically locked at a set position, reduce injection or sampling volume deviations caused by human operation errors, and reduce the risk of human errors. At the same time, the automatic locking can also stably fix the piston during the injection or sampling process, thereby improving safety.

[0017] 2. The present invention uses a liquid reservoir locking mechanism to quickly lock the liquid reservoir, making the installation and removal of the liquid reservoir very convenient and quick, further improving the operating efficiency, saving the time and steps of locking and unlocking the liquid reservoir, and reliably locking the liquid reservoir to prevent it from loosening;

[0018] 3. The present invention drives the screw to rotate through a motor, and the screw drives the drive block and the push-pull rod to make linear motion. Since the end of the push-pull rod is connected to the piston of the liquid reservoir through a piston locking mechanism, it can drive the liquid reservoir to achieve positive pressure injection and negative pressure sampling. At the same time, a pull pressure sensor is integrated to monitor the injection and sampling pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A stereoscopic diagram of the micro-microinjection and sampling device of the present invention;

[0020] Figure 2 This is a three-dimensional diagram of the micro-microinjection and sampling device of the present invention after removing the upper cover;

[0021] Figure 3 is a cross-sectional view of the micro-microinjection and sampling device of the present invention;

[0022] Figure 4 It is a longitudinal cross-sectional view of the push-pull rod, the piston locking mechanism and the liquid reservoir in the present invention;

[0023] Figure 5 A three-dimensional diagram of the assembly of the push-pull rod and the piston locking mechanism in the present invention;

[0024] Figure 6 It is an exploded view of the push-pull rod and the piston locking mechanism in the present invention;

[0025] Figure 7 It is a cross-sectional view of the push-pull rod, the piston locking mechanism and the piston in the present invention along the transverse direction;

[0026] Figure 8 A three-dimensional diagram of the assembly of the liquid reservoir and the mounting base in the present invention;

[0027] Fig. 9 It is an exploded view of the mounting seat and the locking slider in the present invention;

[0028] Fig.10 It is a structural schematic diagram of the liquid storage device in the present invention when it is in a locked state;

[0029] Fig.11 It is a structural schematic diagram of the liquid reservoir in the present invention when it is in an unlocked state;

[0030] Fig.12 It is a longitudinal cross-sectional view of a push-pull rod, a piston locking mechanism and a liquid reservoir in another embodiment of the present invention.

[0031] Combined with the attached drawings, the following description is given:

[0032] 1. Mounting seat; 101. Through hole; 102. Positioning groove; 2. Liquid storage cylinder; 3. Piston; 301. Internal thread; 4. Push-pull rod; 401. Accommodating groove; 402. Inclined slide groove; 403. Guide groove; 5. Locking block; 501. Second inclined surface; 502. Limiting leg; 503. Guide block; 6. Locking spring; 601. Clamping spring; 602. Clamping tooth; 603. First inclined surface; 604. Bump; 7. Spring; 8. Driving device; 801. Driving shaft; 9. Locking slider; 901. Arc bayonet; 902. Locking groove; 903. Unlocking groove; 10. Pin shaft; 11. Ball screw; 12. Base; 13. Motor; 14. Screw; 15. Driving block; 16. Pull pressure sensor; 17. Control panel; 18. Display screen; 19. Control button. DETAILED DESCRIPTION

[0033] A preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

[0034] Embodiment 1

[0035] See also Figures 1 to 3 The present invention provides a micro-micro injection and sampling device, comprising a liquid reservoir and a power device, wherein a mounting seat 1 is fixed at one end of the power device, and the liquid reservoir is detachably mounted on the mounting seat 1. The liquid reservoir comprises a liquid storage cylinder 2 and a piston 3 movably built into the liquid storage cylinder 2, wherein the opening end of the liquid storage cylinder 2 is arranged toward the power device, and the power device is used to drive the piston 3 to perform reciprocating linear motion in the liquid storage cylinder 2, so as to realize precise automatic injection of liquid medicine or automatic sampling of patient body fluids.

[0036] A push-pull rod 4 is provided inside the power device, and a piston locking mechanism is installed on one end of the push-pull rod 4 extending outward from the power device. The piston locking mechanism is used to realize rapid locking and rapid unlocking of the piston 3 .

[0037] Specifically, the piston locking mechanism includes a locking block 5 and a locking spring 6. An assembly groove with an internal thread 301 is provided at one end of the piston 3 facing the piston locking mechanism. When the power device drives the push-pull rod 4 to extend toward the liquid reservoir, the push-pull rod 4 can push the locking block 5 and the locking spring 6 into the assembly groove. At the same time, the locking block 5 can stretch the locking spring 6 so that the locking spring 6 is engaged with the internal thread 301.

[0038] The present invention installs a piston locking mechanism on the push-pull rod 4. When the power device drives the push-pull rod 4 to extend toward the liquid reservoir, the locking block 5 is used in conjunction with the locking spring 6 to quickly and automatically lock the piston 3. This can not only improve the operating efficiency and save the time and steps of manually operating to lock the piston 3, so that medical staff can perform injection or sampling operations more quickly, especially speed up the medical process in emergency situations, but also enhance accuracy, ensure that the piston is accurately and automatically locked at the set position, reduce the injection volume or sampling volume deviation caused by human operating errors, and reduce the risk of human errors. At the same time, the automatic locking can also stably fix the piston during the injection or sampling process to improve safety.

[0039] For ease of understanding, the definition is Figure 1 The needle direction of the reservoir shown in the figure is the front, and the opposite direction is the rear.

[0040] See also Figures 4 to 6 The push-pull rod 4 extends outward from the front end of the power device and is provided with a receiving groove 401 which is slightly wider than the locking spring 6 in the axial direction, and in the radial direction, the receiving groove 401 penetrates the outer peripheral surface of the push-pull rod 4. The locking spring 6 is U-shaped and is installed in the receiving groove 401; the locking spring 6 is provided with two opposite clamping springs 601 and a connecting piece integrally connected to the two clamping springs 601, the connecting piece is low against the bottom of the receiving groove 401, and is limited by a latch installed on the push-pull rod 4 to prevent the locking spring 6 from slipping out of the push-pull rod 4.

[0041] Furthermore, at the front end of the two clamping springs 601, the outer surfaces of the two clamping springs 601 facing away from each other are provided with sawtooth-shaped latching teeth 602. In a free state, the latching teeth 602 on the two clamping springs 601 protrude from the push-pull rod 4 from the upper and lower sides of the receiving groove 401. The rear end portion of the locking block 5 is located in the receiving groove 401 and between the two clamping springs 601. The locking block 5 is used to push the two clamping springs 601 to elastically deform in a direction away from each other, so that the latching teeth 602 can be engaged with the internal thread 301.

[0042] See also Figure 6 , also at the front end of the two clamping springs 601, the inner side surfaces of the two clamping springs 601 facing each other are provided with first inclined surfaces 603, and the distance between the front ends of the two first inclined surfaces 603 is greater than the distance between the rear ends. The locking block 5 is provided with wedge blocks on both the upper and lower sides, and the two wedge blocks have second inclined surfaces 501, and the two second inclined surfaces 501 are arranged opposite to the two first inclined surfaces 603 one by one and have the same inclination angle. The locking block 5 relies on the cooperation between the second inclined surface 501 and the first inclined surface 603 to realize the elastic deformation of pushing the two clamping springs 601 in the direction away from each other.

[0043] See also Figure 4 A protrusion is axially provided at the front end of the locking block 5, and a spring 7 is mounted on the protrusion. When the power device drives the push-pull rod 4 to drive the piston locking mechanism to move toward the liquid reservoir, the locking block 5 abuts against the piston 3 through the spring 7.

[0044] like Figure 7 As shown, the end of the locking block 5 facing away from the piston 3 (i.e., the rear end of the locking block 5) is provided with two elastic limiting legs 502 distributed in an "eight" shape, and the push-pull rod 4 is provided with two inclined grooves 402. The two limiting legs 502 are inserted into the two inclined grooves 402 one by one, and when the piston 3 is locked, the two limiting legs 502 protrude from the corresponding inclined grooves 402 to the outer peripheral surface of the push-pull rod 4.

[0045] See also Figure 3 The mounting seat 1 is provided with a vertical plate, which is fixed on the front end surface of the power device, and the vertical plate is provided with a through hole 101 facing the piston 3. One end of the push-pull rod 4 passes through the through hole 101 and is connected to the piston 3 through the piston locking mechanism.

[0046] In addition, in the middle part of the clamping spring piece 601, the outer surfaces of the two clamping spring pieces 601 facing away from each other are both provided with convex bumps 604. In this embodiment, the convex bumps 604 are conical, and both convex bumps 604 protrude from the outer peripheral surface of the push-pull rod 4, and the distance between the tips of the two convex bumps 604 is greater than the inner diameter of the through hole 101, so that when the power device drives the push-pull rod 4 to drive the piston locking mechanism to retract, the through hole 101 can squeeze the two convex bumps 604 to make the two clamping spring pieces 601 move toward each other, thereby making the latching teeth 602 disengage from the internal thread 301.

[0047] The locking process of the piston 3 in this embodiment is as follows:

[0048] After the liquid reservoir is installed in place, the power device drives the push-pull rod 4 to drive the piston locking mechanism to move toward the liquid reservoir, so that the locking block 5 and the locking spring 6 are both extended into the assembly groove of the piston 3. When the locking block 5 is in contact with the piston 3 through the spring 7, the locking block 5 no longer moves. As the push-pull rod 4 drives the locking spring 6 to continue to move, the two first inclined surfaces 603 of the locking spring 6 begin to fit with the two second inclined surfaces 501 of the locking block 5, and in the following process, the two clamping springs 601 of the locking spring 6 are stretched open by the locking block 5 and expand outward, so that the locking teeth 602 are engaged with the internal thread 301, thereby realizing automatic locking of the piston 3; at the same time, under the push of the push-pull rod 4, the two limiting legs 502 of the locking block 5 are elastically deformed, and protrude outward from the corresponding inclined grooves 402 of the push-pull rod 4.

[0049] It should be noted that, during the locking process of the piston 3, the end of the liquid storage cylinder 2 in the present invention is sealed by silicone rubber, and the interior of the liquid storage cylinder 2 is in a closed state. At this time, the piston 3 will not be pushed by the locking block 5, and the locking spring 6 can be smoothly engaged with the internal thread 301 of the piston 3. Only when the bidirectional needle is installed at the end of the liquid storage cylinder 2, the liquid cavity in the liquid storage cylinder 2 will be connected to the outside, and injection and sampling operations can be performed.

[0050] The unlocking process of the piston 3 in this embodiment is as follows:

[0051] The power device drives the push-pull rod 4 to drive the piston locking mechanism and the piston 3 to move toward the inside of the power device. The two limit legs 502 of the locking block 5 will first stop on the vertical plate of the mounting seat 1, and will no longer move with the push-pull rod 4. As the push-pull rod 4 drives the locking spring 6 to continue to move, the locking block 5 leaves the locking spring 6, which can provide space for the two clamping springs 601 to be retracted; then, when the two convex bumps 604 on the locking spring 6 arrive at the through hole 101, in the following process, the through hole 101 can squeeze the two convex bumps 604 so that the two clamping springs 601 move toward each other, thereby causing the latching teeth 602 to disengage from the internal thread 301, thereby achieving automatic unlocking of the piston 3.

[0052] It is worth mentioning that the front end of the push-pull rod 4 is also provided with a guide groove 403 which is distributed in a "cross" shape with the accommodating groove 401, and guide blocks 503 are provided on both sides of the left and right sides of the locking block 5. The guide blocks 503 slide in the guide groove 403 to ensure the stability of the movement of the locking block 5, thereby ensuring that it can be reliably locked and unlocked.

[0053] See also Figures 8 to 11 The mounting seat 1 is also provided with a bottom plate which is vertically distributed with the vertical plate. The front end and the rear end of the bottom plate are provided with semicircular positioning grooves 102 , and the liquid storage cylinder 2 is installed in the positioning grooves 102 .

[0054] In addition, a reservoir locking mechanism is installed on the mounting base 1, and the reservoir locking mechanism includes two locking sliders 9 respectively located on both sides of the positioning groove 102, and the two locking sliders 9 are provided with arc-shaped arc-shaped bayonet 901 on the sides facing each other. The reservoir has two states, namely, the locked state: the arc-shaped bayonet 901 of the two locking sliders 9 is just stuck on the outer peripheral wall of the reservoir 2 (such as Fig.10 As shown), and unlocked state: the upper parts of the arc-shaped bayonet 901 of the two locking sliders 9 are opened in a direction away from each other, and at the same time, the lower parts of the arc-shaped bayonet 901 of the two locking sliders 9 lift up the liquid storage cylinder 2 (as shown). Fig.11 As shown). It can be seen that the present invention uses a liquid reservoir locking mechanism to quickly lock the liquid reservoir, which is very convenient and quick to operate, improves operating efficiency, saves time and steps for locking the liquid reservoir, and can reliably lock the liquid reservoir to prevent it from loosening.

[0055] Specifically, grooves are provided on both sides of the positioning groove 102 of the mounting seat 1, and the two locking sliders 9 are rotatably installed in the two grooves on the mounting seat 1 through the pin shaft 10. At the same time, a ball screw 11 is fixed on one side wall of the groove of the mounting seat 1, and a locking groove 902 and an unlocking groove 903 that can cooperate with the ball screw 11 are provided on the locking slider 9. When the locking slider 9 rotates around the pin shaft 10, the ball screw 11 can slide from one of the locking groove 902 and the unlocking groove 903 to the other, thereby switching the liquid reservoir between the locked state and the unlocked state.

[0056] The locking process of the liquid reservoir in this embodiment is as follows:

[0057] The two locking sliders 9 are in the open state, and the ball screw 11 is in the unlocking groove 903 at this time; place the liquid reservoir in the positioning groove 102 of the mounting base 1, and press the liquid reservoir downward with force, the liquid reservoir pushes the two locking sliders 9 to rotate around their respective pin shafts 10, so that the ball screw 11 slides relatively from the unlocking groove 903 to fall into the locking groove 902, and at this time, the arc-shaped bayonet 901 of the two locking sliders 9 are just stuck on the outer peripheral wall of the liquid reservoir 2 to achieve rapid locking of the liquid reservoir.

[0058] The unlocking process of the liquid reservoir in this embodiment is as follows:

[0059] Hold the lower end parts of the two locking sliders 9 and press them diagonally downward toward the inside at the same time to push the two locking sliders 9 to rotate in opposite directions around their respective pin shafts 10, so that the ball screw 11 slides relatively from the locking groove 902 to fall into the unlocking groove 903. At this time, the upper parts of the arc-shaped bayonet 901 of the two locking sliders 9 are opened in the direction away from each other, and at the same time, the lower parts of the arc-shaped bayonet 901 of the two locking sliders 9 lift up the liquid reservoir to achieve quick unlocking of the liquid reservoir.

[0060] Of course, in other embodiments of the present invention, the ball screw 11 can also be installed on the locking slider 9, and the locking groove 902 and the unlocking groove 903 can be arranged on the groove side wall of the mounting seat 1 to cooperate with the ball screw 11 for positioning.

[0061] See also Figure 2 and Figure 3 The power device includes a base 12, a motor 13 fixed on the base 12, a screw rod 14 connected to the motor 13, and a driving block 15 sleeved on the screw rod 14. Two guide rods are also provided in the base 12. The driving block 15 is slidably fitted on the two guide rods. The push-pull rod 4 is connected to the driving block 15 through a pull pressure sensor 16.

[0062] The working principle of the micro-micro injection and sampling device of the present invention is as follows: the screw rod 14 is driven to rotate by the motor 13, and the screw rod 14 then drives the driving block 15 and the push-pull rod 4 to make linear motion. Since the end of the push-pull rod 4 is connected to the piston 3 of the liquid reservoir through the piston locking mechanism, the liquid reservoir can be driven to achieve positive pressure injection and negative pressure sampling. During this period, the movement displacement and speed of the piston 3 can be controlled by controlling the number and speed of pulses of the motor 13. At the same time, the injection or sampling speed and capacity can be accurately controlled and the pressure can be detected by using the pull pressure sensor 16 and the displacement sensor built into the power device as feedback.

[0063] It is worth mentioning that a control panel 17 is also provided on one side of the base 12, on which a display screen 18 and a plurality of control buttons 19 are installed. The display screen 18 can display the injection or sampling status in real time, including but not limited to the injection / sampling speed, capacity and pressure, and the control buttons 19 can set parameters such as speed and capacity.

[0064] Embodiment 2

[0065] The difference between this embodiment and the first embodiment is that the locking method of the piston locking mechanism is different.

[0066] Specifically, Fig.12 As shown, a driving device 8 is installed on the push-pull rod 4. The driving device 8 can be a voice coil motor or a linear motor, etc. In this embodiment, a voice coil motor is preferred, which is provided with a driving shaft 801. A center hole is provided inside the push-pull rod 4. The driving shaft 801 is slidably arranged in the center hole of the push-pull rod 4 and fixedly connected to the locking block 5. The driving device 8 is used to drive the locking block 5 to move axially through the driving shaft 801.

[0067] The locking process of the piston 3 in this embodiment is as follows: after the liquid reservoir is installed in place, the power device drives the push-pull rod 4 to drive the piston locking mechanism to move toward the liquid reservoir, so that the locking block 5 and the locking spring 6 are both extended into the assembly groove of the piston 3. After being in place, the driving device 8 drives the locking block 5 to move backward through the driving shaft 801, and the two clamping springs 601 of the locking spring 6 are stretched open by the locking block 5 and expand outward, so that the locking teeth 602 are engaged with the internal thread 301, thereby realizing automatic locking of the piston 3.

[0068] The unlocking process of the piston 3 in this embodiment is as follows: the driving device 8 drives the locking block 5 to move forward through the driving shaft 801, and the locking block 5 leaves the locking spring 6. The two clamping springs 601 of the locking spring 6 rely on their own rebound force to make the locking teeth 602 disengage from the internal thread 301, thereby realizing automatic unlocking of the piston 3.

[0069] In this embodiment, the driving device 8 is used to drive the locking block 5 to open the two clamping springs 601 of the locking spring 6. At the same time, the driving device 8 also drives the locking block 5 to leave the locking spring 6. The locking spring 6 can rely on its own resilience to make the latching tooth 602 disengage from the internal thread 301, thereby realizing automatic unlocking of the piston 3. Therefore, there is no need to set a limiting leg 502 at the rear end of the locking block 5, and there is no need to set a convex bump 604 on the locking spring 6. The remaining structures of the locking block 5 and the locking spring 6 are the same as those described in the first embodiment.

[0070] It can be seen that the micro-injection and sampling device of the present invention drives the screw rod 14 to rotate through the motor 13, and the screw rod 14 then drives the driving block 15 and the push-pull rod 4 to make linear motion. Since the end of the push-pull rod 4 is connected to the piston 3 of the liquid reservoir through the piston locking mechanism, it can drive the liquid reservoir to achieve positive pressure injection and negative pressure sampling. At the same time, the integrated pull pressure sensor can monitor the injection and sampling pressure; further, the present invention installs a piston locking mechanism on the push-pull rod 4. In the process of the power device driving the push-pull rod 4 to extend toward the liquid reservoir, the locking block 5 is used in conjunction with the locking spring 6 to achieve rapid and automatic locking of the piston 3, which can not only improve the operating efficiency, but also save manual operation to lock the piston 3. time and steps, so that medical staff can perform injection or sampling operations more quickly, especially in emergency situations, which can speed up the medical process, and can also enhance accuracy, ensure that the piston is accurately and automatically locked at the set position, reduce the injection volume or sampling volume deviation caused by human operation errors, and reduce the risk of human error. At the same time, automatic locking can also stably fix the piston during the injection or sampling process to improve safety; in addition, the present invention uses a liquid reservoir locking mechanism to quickly lock the liquid reservoir, so that the installation and removal of the liquid reservoir are very convenient and quick, further improving the operating efficiency, saving the time and steps of locking and unlocking the liquid reservoir, and the liquid reservoir can be reliably locked to prevent it from loosening.

[0071] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A micro-injection and sampling device, comprising a liquid reservoir and a power device, wherein a mounting seat (1) is fixed to one end of the power device, the liquid reservoir is detachably mounted on the mounting seat (1), the liquid reservoir comprises a liquid storage cylinder (2) and a piston (3) movably built into the liquid storage cylinder (2), and the power device is used to drive the piston (3) to perform reciprocating linear motion in the liquid storage cylinder (2); characterized in that: The power device is provided with a push-pull rod (4), one end of which is provided with a piston locking mechanism, the piston locking mechanism comprising a locking block (5) and a locking spring (6), and one end of the piston (3) facing the piston locking mechanism is provided with an assembly groove with an internal thread (301). When the power device drives the push-pull rod (4) to extend toward the liquid reservoir, the push-pull rod (4) can push the locking block (5) and the locking spring (6) into the assembly groove, and at the same time, the locking block (5) can stretch the locking spring (6) so that the locking spring (6) is engaged with the internal thread (301) to achieve locking.

2. The micro-microinjection and sampling device according to claim 1, characterized in that: The locking spring (6) is U-shaped, and a receiving groove (401) is provided at one end of the push-pull rod (4), and the locking spring (6) is installed in the receiving groove (401); the locking spring (6) is provided with two opposite clamping springs (601), and the two clamping springs (601) are provided with serrated teeth (602) on the outer sides facing away from each other, and the locking block (5) is located between the two clamping springs (601), and the locking block (5) is used to push the two clamping springs (601) to elastically deform in a direction away from each other, so that the teeth (602) are engaged with the internal thread (301).

3. The micro-microinjection and sampling device according to claim 2, characterized in that: The two clamping springs (601) are each provided with a first inclined surface (603) on their inner side surfaces facing each other, and the locking block (5) is provided with two second inclined surfaces (501) corresponding to the two first inclined surfaces (603) one by one, and the locking block (5) relies on the cooperation between the second inclined surfaces (501) and the first inclined surfaces (603) to push the two clamping springs (601) to elastically deform in a direction away from each other.

4. The micro-microinjection and sampling device according to claim 2, characterized in that: The mounting seat (1) is provided with a through hole (101), and one end of the push-pull rod (4) passes through the through hole (101) and is connected to the piston (3) through the piston locking mechanism; the two clamping springs (601) are also provided with convex bumps (604) on the outer sides facing away from each other, and the two convex bumps (604) protrude from the outer peripheral surface of the push-pull rod (4). When the power device drives the push-pull rod (4) to retract the piston locking mechanism, the through hole (101) squeezes the two convex bumps (604) so ​​that the two clamping springs (601) move toward each other, thereby causing the latching teeth (602) to disengage from the internal thread (301).

5. The micro-microinjection and sampling device according to claim 4, characterized in that: A spring (7) is installed on the locking block (5). When the power device drives the push-pull rod (4) to drive the piston locking mechanism to move toward the liquid reservoir, the locking block (5) abuts against the piston (3) through the spring (7); the locking block (5) is provided with two elastic limiting legs (502) distributed in an "eight" shape at one end facing away from the piston (3); the push-pull rod (4) is provided with two inclined grooves (402), and the two limiting legs (502) are inserted into the two inclined grooves (402) one by one. When the piston (3) is locked, the two limiting legs (502) protrude from the corresponding inclined grooves (402) to the outer peripheral surface of the push-pull rod (4).

6. The micro-microinjection and sampling device according to claim 2, characterized in that: One end of the push-pull rod (4) is also provided with a guide groove (403) which is distributed in a "cross" shape with the accommodating groove (401); the locking block (5) is provided with a guide block (503), and the guide block (503) is slidably fitted in the guide groove (403).

7. The micro-microinjection and sampling device according to claim 2, characterized in that: A driving device (8) is installed on the push-pull rod (4), and the driving device (8) is provided with a driving shaft (801). The driving shaft (801) is fixedly connected to the locking block (5), and the driving device (8) is used to drive the locking block (5) to move axially via the driving shaft (801).

8. The micro-microinjection and sampling device according to claim 1, characterized in that: The mounting seat (1) is provided with a positioning groove (102), and the liquid storage cylinder (2) is installed in the positioning groove (102); the mounting seat (1) is provided with locking sliders (9) on both sides of the positioning groove (102), and the two locking sliders (9) are provided with arc-shaped bayonet holes (901) on the sides facing each other, and the liquid storage cylinder (2) has two states, namely a locked state: the arc-shaped bayonet holes (901) of the two locking sliders (9) are just stuck on the outer peripheral wall of the liquid storage cylinder (2), and an unlocked state: the upper parts of the arc-shaped bayonet holes (901) of the two locking sliders (9) are opened in a direction away from each other, and at the same time, the lower parts of the arc-shaped bayonet holes (901) of the two locking sliders (9) lift up the liquid storage cylinder (2).

9. The micro-microinjection and sampling device according to claim 8, characterized in that: The locking slider (9) is rotatably mounted on the mounting seat (1) via a pin shaft (10), and one of the locking slider (9) and the mounting seat (1) is provided with a ball screw (11), and the other is provided with a locking groove (902) and an unlocking groove (903). When the locking slider (9) rotates around the pin shaft (10), the ball screw (11) can slide from one of the locking groove (902) and the unlocking groove (903) to the other, thereby switching the liquid reservoir between a locked state and an unlocked state.

10. The micro-microinjection and sampling device according to claim 1, characterized in that: The power device comprises a base (12), a motor (13) fixed on the base (12), a screw rod (14) connected to the motor (13), and a drive block (15) sleeved on the screw rod (14); the push-pull rod (4) is connected to the drive block (15) via a pull pressure sensor (16).

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