Blood collector with negative pressure device

Abstract

The invention discloses a hemostix with a negative pressure device, which comprises an internal sealing shell, the internal sealing shell is provided with an outward blood collection inlet for collecting blood, a negative pressure chamber is formed in the internal sealing shell, the external part of the internal sealing shell is sleeved with a shell playing a protection role, and the side edge of the internal sealing shell is connected with an insertion tube; a blood collection tube is connected to the insertion tube in a sleeving mode, a large button capable of being repeatedly pressed is arranged at the end, located on the other side opposite to the blood collection inlet, of an inner sealing shell of the insertion tube, an air one-way valve is connected to the side edge of the insertion tube, a blood collection mechanism is rotationally arranged in the inner sealing shell of the insertion tube, and a coil spring is arranged at the upper end of the blood collection mechanism; a plurality of excitation locks are arranged on an internal sealing shell, after the excitation locks are opened, a large button which is repeatedly pressed can generate negative pressure in the internal sealing shell, and then sampled blood is adsorbed and drained, so that the sampled blood flows into the blood collection tube through an insertion tube.

Description

Technical Field

[0001] This invention relates to the field of blood collection devices, and particularly to a blood collection device with a negative pressure device. Background Technology

[0002] Traditional blood collection devices have many shortcomings in medical blood collection: lack of safety protection, simple triggering structure that is easy to accidentally touch and cause scratches, lack of negative pressure system leading to low blood collection efficiency (low bleeding volume), and traditional blood collection devices require professional operation. In order to address the above problems, the inventor has designed a blood collection device with multiple protection functions and negative pressure suction, which allows patients to collect blood at home. Summary of the Invention

[0003] The main objective of this invention is to address the problems of inadequate safety protection, simple trigger structure leading to accidental injury, and low blood collection efficiency due to the lack of a negative pressure system.

[0004] To address the above problems, this invention proposes a blood collection device with a negative pressure mechanism, comprising: The internal sealed housing has an outward-facing blood collection inlet, and a negative pressure chamber is formed inside the internal sealed housing. The outer casing is a sealed inner shell that is fitted onto an outer shell to provide protection. The insertion tube is connected to the side of the inner sealed shell, and a blood collection tube is sleeved on the insertion tube. A large button is located at the end of the internal sealed housing and on the opposite side of the blood collection inlet, which can be pressed repeatedly. An air check valve, with an air check valve connected to the side of its connector; The blood collection mechanism has a rotating internal sealed housing with a coil spring at the top. The trigger lock has multiple trigger locks installed on its internal sealed housing; When the trigger lock is opened, repeatedly pressing the large button will generate negative pressure inside the inner sealed housing, which will then attract and drain the sampled blood, allowing the sampled blood to flow into the blood collection tube through the insertion tube.

[0005] In one embodiment, a pressing spring is provided inside the accommodating cavity formed by the inner sealed housing and the large button, which provides a reset force to the large button after repeated pressing.

[0006] In one embodiment, a pressure plate is slidably provided inside the internal sealing housing.

[0007] In one embodiment, the trigger lock includes trigger lock II, which is housed inside the inner sealing housing and located at the bottom of the pressure plate. The inner sealing housing has a through groove corresponding to trigger lock II, so that trigger lock II can be pressed down inside the through groove. The bottom sides of the through groove have slots corresponding to trigger lock II, so that trigger lock II will be engaged inside the slots when pressed to the bottom position.

[0008] In one embodiment, the trigger lock includes trigger lock I, and a side plate is provided on the side of the internal sealed housing, with trigger lock I inserted into the inside of the side plate; The side plate and the inside of the trigger lock I have through holes, and the small button is inserted into the inside of the through hole. Pressing it inward can penetrate into the inside of the inner sealed housing.

[0009] In one embodiment, an activation latch is rotatably provided inside the inner sealed housing and on the side of the blood collection mechanism. The bottom of the activation latch is hooked onto the blood collection mechanism, and a limit post is provided at the upper end of the activation latch near the side of the blood collection mechanism.

[0010] In one embodiment, the blood collection mechanism includes a turntable with a rotatable shaft inside. A blade facing the blood collection inlet is provided inside the turntable and sleeved on the shaft. An inclined plate is provided on the back of the turntable, and one end of a coil spring is coupled to the inclined plate. The blood collection mechanism is rotatably disposed inside the inner sealed housing via the shaft.

[0011] In one embodiment, the small button includes a linkage, one end of which is provided with a pressing handle, and the other end of which is provided with a beveled protrusion and a compression groove. When the beveled protrusion is compressed, it will retract inward through the compression groove. When the beveled protrusion is compressed into the inner sealed housing, it cannot be pulled out due to the obstruction of the side of the beveled protrusion.

[0012] In one embodiment, the air check valve includes a cylindrical housing with an exhaust port connected to one side and an exhaust pipe connected to the other side. The air check valve is connected to the exhaust pipe and the connector pipe. A spring is provided inside the cylindrical housing, with a support seat at one end and a rubber plug at the other end.

[0013] In one embodiment, an adhesive layer is provided on the bottom of the housing. Beneficial effects

[0014] The technical solution of this invention uses a multi-level linkage structure of pressure plate, trigger lock I, trigger lock II, and trigger latch. It is necessary to press the pressure plate to lock the coil spring and align the through hole in sequence, press the small button to unlock the trigger latch, and release the blood collection mechanism to avoid accidental blade ejection caused by accidental triggering, thereby improving the safety of use.

[0015] The technical solution of this invention, trigger lock II, achieves position locking after the pressure plate is pressed down through the interlocking design of through slot and slot, avoiding spring rebound. Trigger lock I uses spring support to abut against the pressure plate. Under normal conditions, it clamps the small button by overlapping through hole. The small button is only allowed to be triggered after the pressure plate is pressed down, forming double safety protection.

[0016] The technical solution of this invention uses a rotary blood collection mechanism, in which a coil spring drives the rotary table to rotate the blade. The depth of the blade's downward stroke is strictly controlled within 1-2 millimeters, which satisfies the blood flow required for blood collection while avoiding excessive damage to the patient's skin, thus balancing blood collection efficiency and user comfort.

[0017] The technical solution of this invention utilizes an integrated negative pressure generation structure that combines a large button mechanical drive with an air one-way valve flow control. Repeated pressing of the large button enables active exhaust and passive negative pressure circulation within the negative pressure chamber. When the large button is pressed, the internal space of the sealed housing is compressed, increasing the pressure and driving the rubber plug of the air one-way valve to overcome the spring force and detach from the exhaust pipe, quickly expelling gas from the chamber. When the large button automatically resets under the action of the pressing spring, the chamber space expands, forming negative pressure. This pressure precisely seals the exhaust pipe, preventing external air backflow. Simultaneously, the negative pressure creates an adsorption force that further promotes blood collection. This design requires no additional power source. Through the adaptive linkage of the mechanical structure, it achieves rapid generation, stable maintenance, and directional transmission of negative pressure, ensuring efficient and smooth flow of blood into the blood collection tube under negative pressure. Furthermore, the negative pressure intensity can be flexibly adjusted by the pressing frequency to adapt to different blood collection scenarios. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the blood collection device of the present invention; Figure 2 This is a three-dimensional schematic diagram of the blood collection device of the present invention; Figure 3 This is a schematic diagram of a partial cross-sectional structure of the blood collection device of the present invention; Figure 4 This is a schematic diagram of the full-section structure of the blood collection device of the present invention; Figure 5 This is a schematic diagram of the blood collection device of the present invention with the outer shell removed; Figure 6 This is a schematic diagram of the internal structure of the blood collection device of the present invention; Figure 7 This is a schematic diagram of the internal structure of the blood collection device of the present invention; Figure 8 This is a schematic diagram of the blood collection mechanism of the present invention; Figure 9 This is a schematic diagram of the small button structure of the present invention; Figure 10 This is a three-dimensional structural diagram of the air check valve of the present invention; Figure 11 This is a schematic diagram of the full cross-sectional structure of the air check valve of the present invention; Figure 12 This is a three-dimensional schematic diagram of the blood collection device of the present invention.

[0020] The annotations in the attached figures are explained as follows: 1. Large button; 2. Outer casing; 3. Blood collection tube; 4. Small button; 41. Press handle; 42. Connecting rod; 43. Angled protrusion; 44. Extrusion groove; 5. Insertion tube; 6. Negative pressure chamber; 7. Blood collection inlet; 8. Blood flow guidance notch; 9. Blood collection mechanism; 91. Inclined plate; 92. Rotating shaft; 93. Turntable; 94. Blade; 10. Coil spring; 11. Pressure plate; 12. Trigger lock; 13. Press spring; 14. Trigger lock II; 15. Sealing ring; 16. Air check valve; 161. Cylindrical housing; 162. Exhaust port; 163. Exhaust pipe; 164. Rubber plug; 165. Spring; 166. Support base; 17. Internal sealed housing; 18. Anti-detachment hook; 19. Side plate; 20. Trigger lock I; 21. Limiting post; 22. Adhesive layer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] To achieve the above-mentioned objectives of the invention, such as Figure 1-12As shown, the present invention provides a blood collection device with a negative pressure device, including an inner sealed housing 17 and an outer shell 2. The outer shell 2, which serves as a protective sleeve, is fitted over the inner sealed housing 17. The inner sealed housing 17 has an outward-facing blood collection inlet 7 for blood collection. A negative pressure chamber 6 is formed inside the inner sealed housing 17. A connector 5 is connected to the side of the inner sealed housing 17. A blood collection tube 3 is sleeved on the connector 5. A large button 1 that can be repeatedly pressed is provided at the end of the inner sealed housing 17 and on the opposite side of the blood collection inlet 7. An air check valve 16 is connected to the side of the connector 5. A blood collection mechanism 9 is rotatably arranged inside the inner sealed housing 17. A coil spring 10 is provided at the upper end of the blood collection mechanism 9. Multiple trigger locks are provided on the inner sealed housing 17. In this embodiment, when blood collection is required, the blood collection tube 3 is positioned downwards, and the bottom of the outer shell 2 is tightly attached to the arm of the patient requiring blood collection. Then, by pressing, each trigger lock is opened. When the trigger lock is opened, the blood collection mechanism 9 can cut the patient's arm. Then, the large button 1, which is pressed repeatedly, will generate negative pressure inside the inner sealed shell 17, thereby adsorbing and draining the sampled blood, allowing the sampled blood to flow into the blood collection inlet 7, and then flow into the inside of the blood collection tube 3 through the insertion tube 5.

[0023] As a further improvement, a blood flow guiding notch 8 is provided between the blood collection inlet 7 and the insertion tube 5. Blood enters the blood collection inlet 7 and flows into the interior of the insertion tube 5 through the blood flow guiding notch 8, and is then collected through the blood collection tube 3. The blood flow guiding notch 8 has a triangular cross-section. This design allows the blood to flow into the interior of the insertion tube 5 more effectively, avoiding excessive blood contamination of the contact surface and preventing excessive blood loss and waste.

[0024] Preferably, when the patient's arm is cut, the deepest point of the blood collection mechanism 9 is about 1-2 millimeters, which will not cause great harm to the patient and can ensure the normal progress of blood collection.

[0025] like Figure 3 , 4 As shown, a pressing spring 13 is provided inside the accommodating cavity formed by the internal sealed housing 17 and the large button 1. The pressing spring 13 provides a reset force to the large button 1 through repeated pressing. In this way, through repeated pressing, the pressing spring 13 gives the large button 1 an upward reset force, so that the pressed large button 1 can rebound upward and reset.

[0026] like Figure 2 , 3As shown in Figures 4, 5, and 6, the internal sealed housing 17 is equipped with a sliding pressure plate 11. Pressing the pressure plate 11 downwards can press the activation lock, thereby opening the activation lock. The downward pressing of the pressure plate 11 will also compress the coil spring 10, thereby tightening the coil spring 10, which can drive the blood collection mechanism 9 to rotate when the blood collection device is used.

[0027] Specifically, the trigger lock includes trigger lock II 14, which is housed inside the inner sealing housing 17 and located at the bottom of the pressure plate 11. The inner sealing housing 17 has a through groove corresponding to trigger lock II 14, allowing trigger lock II 14 to be pressed down inside the through groove. The bottom sides of the through groove have slots corresponding to trigger lock II 14, and trigger lock II 14 will be engaged inside the slots when pressed to the bottom position. This allows trigger lock II 14 and pressure plate 11 to be fixed to the bottom when pressed down, thereby preventing them from rebounding and resetting.

[0028] Additionally, it should be noted that the bottom of the trigger lock II 14 is fixedly connected to the pressure plate 11. Therefore, after the trigger lock II 14 is locked in position, the pressure plate 11 can also be locked in position.

[0029] like Figure 7 As shown, the trigger lock also includes trigger lock I20. A side plate 19 is provided on the side of the inner sealing housing 17. The trigger lock I20 is inserted into the inside of the side plate 19. The side plate 19 and trigger lock I20 have through holes. The small button 4 is inserted into the through hole and can penetrate into the inside of the inner sealing housing 17 when pressed inward. Thus, when the pressure plate 11 is pressed down, it will drive trigger lock I20 to move downward, thereby locking trigger lock I20 in the pressed position, so that the through hole on trigger lock I20 completely coincides with the through hole on the side plate 19. When the pressure plate 11 is not pressed, the through hole on the trigger lock I20 and the through hole on the side plate 19 are partially overlapped. The sides of the through holes of the two will clamp the small button 4, so that the small button 4 cannot be pressed inward. When the two overlap, the space between them allows the small button 4 to be pressed inward.

[0030] It should also be noted that the side plate 19 has a cavity inside to accommodate the trigger lock I 20. The trigger lock I 20 is inserted into the cavity of the side plate 19, and a spring is elastically provided at the bottom. The spring provides an upward supporting force. Then, the top of the trigger lock I 20 abuts against the pressure plate 11. When the pressure plate 11 is pressed down, the trigger lock I 20 will overcome the elastic force of the spring and move downward.

[0031] like Figure 3 , 4As shown, an activation latch 12 is rotatably installed inside the internal sealed housing 17 and located on the side of the blood collection mechanism 9. The bottom of the activation latch 12 is hooked onto the blood collection mechanism 9, and a limiting post 21 is provided at the upper end of the activation latch 12 near the side of the blood collection mechanism 9. Thus, when the activation latch 12 is not pressed inward, the upper end of the activation latch 12 will be located outside the limiting post 21, and the limiting post 21 will block the activation latch 12, so that the bottom of the activation latch 12 can be tightly hooked onto the blood collection mechanism 9, thereby blocking the blood collection mechanism 9. When the small button 4 is pressed inward, the small button 4 will squeeze the activation latch 12 inward, so that the activation latch 12 passes over the limiting post 21, and the lower end of the activation latch 12 will disengage from the blood collection mechanism 9. Then, the blood collection mechanism 9 will rotate under the action of the coil spring 10, thereby piercing the skin of the patient and realizing blood sampling.

[0032] It should also be noted that the limiting post 21 has a certain degree of elasticity. When not in use, it can block the trigger latch 12. When the small button 4 is pressed hard, the limiting post 21 will deform, thereby allowing the trigger latch 12 to pass over the limiting post 21 and trigger the blood collection action.

[0033] like Figure 8 As shown, the blood collection mechanism 9 includes a turntable 93, inside which is a rotatable shaft 92. Inside the turntable 93 and sleeved on the shaft 92, there is a blade 94 facing the blood collection inlet 7. On the back of the turntable 93, there is an inclined plate 91, one end of which is coupled to the inclined plate 91. The blood collection mechanism 9 is rotatably disposed inside the inner sealed housing 17 via the shaft 92. Thus, the trigger latch 12 is attached to the bottom of the turntable 93. When the trigger latch 12 is rotated by external force and disengages from the turntable 93 of the blood collection mechanism 9, the turntable 93 will lose its limiting restraint. At this time, the coil spring 10 will return to its original state under its own elastic force. At this time, one end of the return coil spring 10 presses the inclined plate 91. The pressed inclined plate 91 will drive the turntable 93 to rotate, which in turn drives the blade 94 to rotate, so that the rotating blade 94 can cut the skin of the blood collection patient, thereby realizing the blood collection sampling work.

[0034] like Figure 9 As shown, the small button 4 includes a connecting rod 42, one end of which is provided with a pressing handle 41, and the other end of which is provided with a sloping protrusion 43 and a pressing groove 44. When the sloping protrusion 43 is pressed, it will retract inward through the pressing groove 44. When the sloping protrusion 43 is pressed into the inner sealing housing 17, it cannot be pulled out due to the obstruction of the side of the sloping protrusion 43.

[0035] like Figure 11 As shown, the air check valve 16 includes a cylindrical housing 161, with an exhaust port 162 connected to one side of the cylindrical housing 161 and an exhaust pipe 163 connected to the other side of the cylindrical housing 161. The air check valve 16 is connected to the insertion pipe 5 through the exhaust pipe 163. A spring 165 is provided inside the cylindrical housing 161. A support seat 166 is provided at one end of the spring 165, and a rubber plug 164 is provided at the other end. Thus, when the large button 1 is pressed down, the space inside the inner sealing housing 17 will shrink, thereby increasing the pressure inside the inner sealing housing 17. At this time, the increased pressure will overcome the elastic force of the spring 165, thereby causing the rubber plug 164 to move out from the inside of the exhaust pipe 163, and the gas inside the inner sealing housing 17 will be discharged through the cylindrical housing 161 and the exhaust port 162. Moreover, the support 166 is a rigid structure, and there is a gap between the support 166 and the exhaust port 162, so it will not affect the gas discharge. When the large button 1 moves upward, the pressure inside its inner sealed housing 17 decreases. At this time, the reduced pressure creates a negative pressure inside the inner sealed housing 17, which in turn attracts the rubber stopper 164 to be firmly inserted into the exhaust pipe 163, thereby sealing the inside of the exhaust pipe 163 and preventing external gas from entering the inner sealed housing 17. The negative pressure generated inside the inner sealed housing 17 at this time will attract the blood from the patient's cut wound, allowing the blood to flow out more quickly, thus enabling the sampling process.

[0036] As a further improvement, a sealing ring 15 is fitted onto the small button 4. The sealing ring 15 is a rubber ring structure with a snap-fit ​​groove on its outer circumference. The sealing ring 15 is snapped onto the outer shell 2 through the snap-fit ​​groove, thereby preventing air leakage between the small button 4 and the outer shell 2, and thus maintaining the sealing performance of the inner sealing shell 17 to the greatest extent.

[0037] As a further improvement, a sealing ring 15 is fitted onto the large button 1. The sealing ring 15 is a rubber ring structure. An annular groove is opened around the outer side of the large button 1. The sealing ring 15 is fitted into the inside of the annular groove. The sealing ring 15 achieves a seal between the outer shell 2 and the large button 1, thereby preventing air leakage between the two and maximizing the sealing performance of the inner sealing shell 17.

[0038] As a further improvement, anti-detachment hooks 18 are provided on both sides of the lower end of the large button 1, and a corresponding groove is provided on the inner wall of the outer shell 2. The anti-detachment hooks 18 can slide up and down inside the groove on the inner wall of the outer shell 2. By setting the anti-detachment hooks 18, the large button 1 is prevented from falling out of the inner shell 2 when the spring 13 is reset, so that the large button 1 can be pressed repeatedly.

[0039] As another implementation method, such as Figure 12 The outer shell 2 and the bottom of the inner sealed shell 17 are provided with an adhesive layer 22, and the outside of the adhesive layer 22 is covered with a release film. In this way, when using the blood collection device, the release film can be torn off in advance to expose the adhesive layer 22, and then the blood collection device can be attached to the arm through the adhesive layer 22. Through this setting, the entire blood collection device can be more firmly fixed to the arm, avoiding accidental slippage of the blood collection device from the arm.

[0040] Working principle: Connect the blood collection tube 3 to the insertion tube 5 on the side of the inner sealing shell 17, with the blood collection tube 3 facing down. Then, tightly attach the bottom of the outer shell 2 of the inner sealing shell 17 to the patient's blood collection site (such as the arm) to complete the basic positioning and component assembly before blood collection. First, press down the pressure plate 11 that is slidably disposed inside the inner sealing housing 17 using the large button 1. When the pressure plate 11 moves down, it drives the excitation lock II 14, which is fixedly connected at the bottom, to press down along the corresponding through groove of the inner sealing housing 17 until the excitation lock II 14 is engaged in the slot at the bottom of the through groove, thereby locking the position of the pressure plate 11. At the same time, the pressure plate 11 squeezes the coil spring 10 to compress it, and the downward movement of the pressure plate 11 also pushes the excitation lock I 20 in the side plate 19 cavity of the inner sealing housing 17 to overcome the bottom spring force and move downward, so that the through hole on the excitation lock I 20 and the through hole on the side plate 19 are completely overlapped (when not pressed, the two through holes partially overlap and clamp the small button 4). At this time, the small button 4 inserted in the through hole can be pressed inward. The inclined protrusion 43 of the small button 4 is compressed through the squeezing groove 44 and penetrates into the inner sealing housing 17, squeezing the excitation lock buckle 12 rotatably set in the inner sealing housing 17, so that it passes over the limit post 21 and releases the bottom of the excitation lock buckle 12 from the blood collection mechanism 9. After the turntable 93 of the blood collection mechanism 9 is freed from the restraint of the trigger lock 12, the compressed coil spring 10 returns to its original position under its own elastic force. One end of the spring presses against the inclined plate 91 on the back of the turntable 93, causing the turntable 93 to rotate around the rotating shaft 92. The blade 94 inside the turntable 93 facing the blood collection inlet 7 rotates accordingly, cutting the patient's skin with a downward cutting depth of 1-2 mm. When the large button 1 at the end of the inner sealing housing 17 is pressed repeatedly, the space of the inner accommodating chamber of the inner sealing housing 17 shrinks and the pressure increases, which overcomes the elastic force of the spring 165 in the air check valve 16 and pushes the rubber plug 164 out of the exhaust pipe 163. The gas is discharged through the cylindrical housing 161 and the exhaust port 162 of the air check valve 16. When the large button 1 moves upward under the restoring force of the pressing spring 13, the internal space of the inner sealed housing 17 expands and the pressure decreases to form a negative pressure, which adsorbs the rubber plug 164 to block the exhaust pipe 163 and prevents external air from entering. Negative pressure is conducted to the blood collection inlet 7, which draws in blood from the patient's wound. The blood then flows into the blood collection inlet 7, and is guided through the triangular blood flow guiding notch 8 between the blood collection inlet 7 and the insertion tube 5 to the insertion tube 5, and finally flows into the blood collection tube 3 to complete the blood collection.

[0041] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A lancing device with a negative pressure device, characterized in that It includes: The internal sealed shell (17) is provided with a blood sampling inlet (7) outwardly opened for blood sampling, and a negative pressure chamber (6) is formed in the internal sealed shell (17); The shell (2) is sleeved outside the internal sealed shell (17) to play a protective role; The plug-in pipe (5) is connected to the side of the internal sealed shell (17), and the blood sampling tube (3) is sleeved on the plug-in pipe (5); The large button (1) is arranged at the end of the internal sealed shell (17) and located on the opposite side of the blood sampling inlet (7), and the large button (1) can be repeatedly pressed; The air one-way valve (16) is connected to the side of the plug-in pipe (5); The blood sampling mechanism (9) is rotatably arranged in the internal sealed shell (17), and the upper end of the blood sampling mechanism (9) is provided with a coil spring (10); The internal sealed shell (17) is provided with a plurality of trigger locks; When the trigger lock is opened, the repeatedly pressed large button (1) generates negative pressure in the internal sealed shell (17), thereby adsorbing and draining the sampled blood, so that the sampled blood flows into the internal sealed shell (17) through the plug-in pipe (5).

2. A lancing device with a negative pressure device as defined in claim 1, characterized in that The accommodating cavity formed by the internal sealed shell (17) and the large button (1) is provided with a pressing spring (13), which provides a reset force for the repeatedly pressed large button (1).

3. A lancing device with a negative pressure device as defined in claim 2, characterized in that The internal sealed shell (17) is slidably provided with a pressing plate (11).

4. A lancing device with a negative pressure device as defined in claim 3, characterized in that The trigger lock includes a trigger lock II (14), which is arranged in the internal sealed shell (17) and located at the bottom position of the pressing plate (11). The internal sealed shell (17) is provided with a through slot corresponding to the trigger lock II (14), so that the trigger lock II (14) can be pressed downward in the through slot. The bottom of the through slot is provided with a clamping groove corresponding to the trigger lock II (14), and the trigger lock II (14) is clamped in the clamping groove when pressed to the bottom position.

5. A lancing device with a negative pressure device as defined in claim 4, characterized in that The trigger lock includes a trigger lock I (20), and the side of the internal sealed shell (17) is provided with a side plate (19), and the trigger lock I (20) is inserted into the internal sealed shell (17). The side plate (19) and the trigger lock I (20) are provided with a through hole, the small button (4) is inserted into the through hole, and the small button (4) can be pressed inward to penetrate into the internal sealed shell (17).

6. A lancing device with a negative pressure device as defined in claim 5, characterized in that The internal sealed shell (17) is rotatably provided with a trigger lock buckle (12) at the side of the blood sampling mechanism (9), the bottom of the trigger lock buckle (12) is hung on the blood sampling mechanism (9), and the upper end of the trigger lock buckle (12) is provided with a limiting column (21) close to the side of the blood sampling mechanism (9).

7. A lancing device with a negative pressure device as defined in claim 6, characterized in that The blood sampling mechanism (9) comprises a rotating disc (93), the inside of the rotating disc (93) is provided with a rotatable rotating shaft (92), the inside of the rotating disc (93) and the rotating shaft (92) are sleeved and provided with a blade (94) towards the blood sampling inlet (7), the back of the rotating disc (93) is provided with an inclined plate (91), one end of the coil spring (10) is coupled and arranged on the inclined plate (91), and the blood sampling mechanism (9) is arranged in the inside of the internal sealed shell (17) through the rotating shaft (92).

8. A lancing device with a negative pressure device as defined in claim 1, wherein, The small button (4) comprises a connecting rod (42), one end of the connecting rod (42) is provided with a pressing handle (41), the other end of the connecting rod (42) is provided with an inclined convex (43), and a pressing groove (44) is formed, so that when the inclined convex (43) is pressed, it is inwards retracted through the pressing groove (44), and when the inclined convex (43) is pressed into the internal sealed shell (17), it cannot be pulled out due to the blockage of the side of the inclined convex (43).

9. A lancing device with a negative pressure device as in claim 1, wherein, The air one-way valve (16) comprises a cylindrical shell (161), one side of the cylindrical shell (161) is connected with an exhaust port (162), the other side of the cylindrical shell (161) is connected with an exhaust pipe (163), the air one-way valve (16) is communicated with the plug-in pipe (5) through the exhaust pipe (163). The inside of the cylindrical shell (161) is provided with a spring (165), one end of the spring (165) is provided with a supporting seat (166), and the other end of the spring (165) is provided with a rubber plug (164).

10. A lancing device with a negative pressure device as in claim 1, wherein, The bottom of the shell (2) is provided with a sticking layer (22).

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