Negative pressure self-suction type distal micro blood sampling test tube
By using a negative pressure self-aspiration blood collection device, which employs a flexible pressing structure and blood collection tube design, the problems of pain and unstable test results in peripheral blood collection devices have been solved, achieving non-invasive blood collection and stable results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PEOPLES HOSPITAL OF LONGYOU COUNTY
- Filing Date
- 2025-01-27
- Publication Date
- 2026-06-05
AI Technical Summary
Existing capillary blood collection devices can easily cause wound pain when collecting capillary blood, and the collected blood does not come into sufficient contact with the anticoagulant, resulting in unstable coagulation and test results.
The negative pressure self-aspiration blood collection method is adopted. Through the design of the flexible pressing structure and blood collection tube, the blood is fully in contact with the anticoagulant during the collection process. The reset of the flexible pressing structure ensures that the blood is evenly distributed in the test tube and avoids coagulation.
It reduces pain during the collection process, ensures sufficient contact between blood and anticoagulant to prevent clotting, and improves the stability and accuracy of test results.
Smart Images
Figure CN224320716U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of peripheral blood collection device technology, and in particular relates to a negative pressure self-aspiration peripheral micro-blood collection tube. Background Technology
[0002] Peripheral blood collection is primarily used for small-volume blood tests. It typically involves selecting sites with abundant capillaries and good circulation, especially in children. This is because children have relatively lower self-control and cooperation levels, and their blood vessels are smaller; peripheral blood collection reduces their pain and discomfort. Furthermore, it reduces blood sample contamination and improves the accuracy of test results. Currently, for routine blood tests using peripheral blood, external micro-blood collection tubes are used with self-prepared diluents. However, external micro-blood collection tubes are prone to coagulation if the blood draw is slow, and the self-prepared diluent evaporates easily after 24 hours. Increasing the diluent volume can introduce data deviations, leading to unstable and highly volatile hemoglobin results.
[0003] Currently, to address the above issues, Chinese patent literature discloses a sampling cap for peripheral blood collection [CN215605722U], comprising a test tube, a test tube cap, and a rubber stopper. The bottom outer edge of the test tube extends downwards, increasing the length of the test tube to 75mm, and a pointed-bottom ball-and-socket joint is provided in the middle of the test tube. The outer wall of the test tube near the opening is provided with a positioning disc, an externally protruding ring, and a first wedge-shaped tooth. A blood scraping flap higher than the opening is provided on the opening. The bottom outer side of the test tube is provided with a positioning notch for positioning in conjunction with a centrifuge. The inner wall of the test tube cap is provided with an externally protruding platform, a second wedge-shaped tooth, and a plunger. The plunger and the inner wall of the test tube cap form a test tube opening groove. The test tube cap above the plunger is provided with a raised edge, and a groove for fixing the rubber stopper is formed between the raised edge and the plunger. A cut is made on the central axis of the rubber stopper.
[0004] The above-mentioned technical solution uses whole blood anticoagulation tubes, which allow blood to come into direct contact with the tube wall, overcoming the shortcomings of unstable results in the past. The results are stable, reliable, and without fluctuations. A small amount of blood can be used to test various items such as complete blood count, high-sensitivity CRP, and amylase-like protein. However, scraping blood from the extremities puts pressure on the wound and causes intense pain. Utility Model Content
[0005] The purpose of this invention is to address the above-mentioned problems by providing a negative pressure self-aspirating capillary micro-blood collection tube that uses negative pressure to draw blood and allows the blood to come into contact with the tube wall coated with an anticoagulant immediately.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: This negative pressure self-aspirating capillary micro-blood collection tube includes a tube body, a first cap is provided at the tube opening of the tube body, a blood collection tube is provided on the first cap and extending through the top of the first cap, the first cap includes an annular cap wall and a cap top, the cap top includes a flexible pressing structure located on one side of the cap, the blood collection tube is located on the edge of the cap top and away from the flexible pressing structure, after the flexible pressing structure is pressed, the cap top tilts as a whole towards the flexible pressing structure and causes the blood collection tube to tilt.
[0007] In the aforementioned negative pressure self-aspirating capillary micro-blood collection tube, the top of the cap wall is higher on the side near the blood collection tube than on the side of the flexible pressing structure, and a crescent-shaped clearance notch is provided on the side of the cap wall near the flexible pressing structure.
[0008] In the aforementioned negative pressure self-aspirating capillary micro-blood collection tube, the flexible pressing structure includes a flexible pressing area on the same plane as the top surface of the cap. The flexible pressing area is elastic and deforms when compressed.
[0009] In the aforementioned negative pressure self-aspiration capillary micro-blood collection tube, the flexible pressing structure further includes an elastic sidewall located at the relief notch. The elastic sidewall is crescent-shaped, complementary to the relief notch, and its thickness is less than that of the cap wall.
[0010] In the aforementioned negative pressure self-aspiration capillary micro-blood collection tube, the elastic sidewall is corrugated, and the corrugation of the elastic sidewall is arranged in a spiral shape.
[0011] In the aforementioned negative pressure self-aspiration capillary micro-blood collection tube, the first cap is inserted into the opening of the tube body, and a second cap is fitted over the first cap, which is plugged into the tube body.
[0012] In the aforementioned negative pressure self-aspiration peripheral micro-blood collection tube, a pressure ring extending towards the first cover is provided in the middle of the second cover. The end of the pressure ring near the first cover abuts against the outer surface of the top of the cover. The pressure ring is a centrally located cylindrical shape that exposes the first cover.
[0013] In the aforementioned negative pressure self-aspiration capillary micro-blood collection tube, a support block is provided on the inner side wall of the second cap body to support the elastic side wall after the second cap body covers the first cap body, and the support block abuts against the outer side of the elastic side wall.
[0014] In the aforementioned negative pressure self-aspiration capillary micro-blood collection tube, the support block is provided with a support protrusion, which is arranged in a spiral manner in conjunction with the corrugated structure on the elastic sidewall. The outer side of the cap wall and the inner side of the second cap are provided with guide strips that are aligned with the direction of the support protrusion.
[0015] In the aforementioned negative pressure self-aspiration capillary micro-blood collection tube, the tube body is provided with a support edge that cooperates with the second cap, and a cap-shaped partition is provided inside the middle section of the tube body.
[0016] Compared with existing technologies, the advantages of this utility model are:
[0017] 1. This utility model uses a negative pressure blood collection tube to collect peripheral blood, which avoids contact and compression with the wound, reducing the patient's pain. During the collection process, the blood collection tube is formed with negative pressure, and the outlet is close to the test tube wall, so that the blood can come into contact with the anticoagulant on the test tube wall in time, effectively preventing the defect of coagulation caused by small collection volume and long residence time during the blood collection process.
[0018] 2. During the blood collection process, as the volume of the test tube increases, the flexible pressing structure resets, and the relative position of the blood collection tube opening and the test tube wall changes. This prevents blood from rushing in and only making contact with a single point on the test tube wall, which would reduce the amount of anticoagulant at that point and prevent subsequent blood from not receiving sufficient anticoagulant and thus clotting.
[0019] 3. During testing, since the blood collection tube is located at the edge of the top cover and the second cover supports the top cover to prevent it from deforming, there is no need to remove the two covers. The puncture needle can be directly inserted into the test tube for sampling, making the operation simple and convenient. Attached Figure Description
[0020] Figure 1 This is a structural schematic diagram provided by this utility model.
[0021] Figure 2 This is an exploded view provided by this utility model.
[0022] Figure 3 This is a cross-sectional view provided by this utility model.
[0023] Figure 4 This is a schematic diagram of the first cover structure provided by this utility model.
[0024] In the figure, the test tube body 1, support edge 11, first cover 2, cover wall 21, cover top 22, clearance notch 23, blood collection tube 3, flexible pressing structure 5, flexible pressing area 51, elastic sidewall 52, second cover 6, pressure ring 61, support block 62, and support protrusion 63 are shown. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0026] like Figure 1-4The negative pressure self-aspirating capillary micro-blood collection tube includes a tube body 1. A first cap 2 is provided at the opening of the tube body 1. A blood collection tube 3 is provided on the first cap 2, penetrating the top of the first cap 2. The first cap 2 includes an annular cap wall 21 and a cap top 22. The cap top 22 includes a flexible pressing structure 5 located on one side of the cap top 22. The blood collection tube 3 is located on the edge of the cap top 22 and away from the flexible pressing structure 5. When the flexible pressing structure 5 is pressed, the cap top 22 tilts towards the flexible pressing structure 5 and causes the blood collection tube 3 to tilt.
[0027] In this embodiment, after the test tube body 1 and the first cap 2 are closed, only the blood collection tube 3 is connected to the outside. When the blood at the end seals the outlet of the blood collection tube 3, a closed space is formed. When the internal space changes, the internal air pressure changes accordingly.
[0028] When peripheral blood needs to be collected, pressing the flexible pressing structure 5 reduces the relative space between the test tube body 1 and the first cap 2. When the blood collection doctor aligns the blood collection tube 3 with the blood droplet at the collection site, they slowly release the pressure applied to the flexible pressing structure 5. This increases the space between the test tube body 1 and the first cap 2, making the internal air pressure lower than the external air pressure. Blood is then drawn into the test tube body 1. This pressure difference between the inside and outside of the tube means the speed at which blood is drawn in depends on the speed at which the pressure on the flexible pressing structure 5 is released, thus providing the blood with a flow rate and ensuring timely contact between the blood and the anticoagulant on the wall of the test tube body 1.
[0029] When pressure is applied to the flexible pressing structure 5, the top (22) of the flexible pressing structure 5 tilts towards the flexible pressing structure (5) and causes the blood collection tube (3) to tilt. The blood collection tube 3 moves towards the tube opening and tube wall of the test tube body 1, further ensuring that the time for blood to come into contact with the anticoagulant on the tube wall when it is drawn into the test tube body 1 is shortened.
[0030] As the pressure on the flexible pressing structure 5 is slowly released, the bleeding port of the blood collection tube 3 moves back to its original position as the flexible pressing structure (5) resets. Simultaneously with the relative displacement of the bleeding port of the blood collection tube 3 relative to the inner wall of the test tube body 1, blood is drawn into the test tube body 1. During this process, the newly drawn blood has a different contact point with the wall of the test tube body 1 compared to the previous one, ensuring that the newly entered blood has sufficient anticoagulant in contact with it, further preventing blood clotting.
[0031] Preferably, the top of the cap 21, near the blood collection tube 3, is higher than the side of the flexible pressing structure 5, and a crescent-shaped clearance notch 23 is provided on the side of the cap 21 near the flexible pressing structure 5. When pressing the flexible pressing structure 5, the cap 21 is avoided from obstructing the movement, allowing the flexible pressing structure 5 to be pressed smoothly, thereby reducing the volume difference between the test tube body 1 and the first cap 2.
[0032] Furthermore, the flexible pressing structure 5 includes a flexible pressing area 51 on the same plane as the top surface of the cover 22. The flexible pressing area 51 is elastic and deforms when pressed. When the flexible pressing area 51 deforms, the cover 22 deforms accordingly to apply pressure, thereby causing the blood collection tube 3 to tilt.
[0033] Preferably, the flexible pressing structure 5 further includes an elastic sidewall 52 located in the relief notch 23. The elastic sidewall 52 is crescent-shaped, complementary to the relief notch 23, and its thickness is less than that of the cover wall 21. This makes it easier for the flexible pressing structure 5 to deform when pressure is applied and easier to return to its initial state when pressure is removed.
[0034] Preferably, the first cover 2 is inserted into the opening of the test tube body 1, and the first cover 2 is covered with a second cover 6, which is plugged into the test tube body 1.
[0035] Furthermore, a pressure ring 61 extending towards the first cover 2 is provided in the middle of the second cover 6. The end of the pressure ring 61 near the first cover 2 abuts against the outer surface of the top cover 22. During testing, since the blood collection tube is located at the edge of the top cover and the second cover is supported by the pressure ring 61 to prevent deformation, there is no need to remove the two covers. The puncture needle can directly puncture into the test tube for sampling. The operation is simple and convenient. The pressure ring 61 is a cylindrical part that exposes the first cover 2. The puncture needle directly punctures the second cover 6 through the pressure ring 61 and enters the test tube body 1.
[0036] Preferably, the inner sidewall of the second cover 6 is provided with a support block 62 that supports the elastic sidewall 52 after the second cover 6 is placed on the first cover 2. The support block 62 abuts against the outer side of the elastic sidewall 52. The sidewall compresses the elastic sidewall 52, further increasing the rigidity of the first cover 2 and the flexible pressing structure (5) after the second cover 6 is placed on, preventing the puncture needle from having difficulty piercing the first cover 1.
[0037] Preferably, the elastic sidewall 52 is corrugated, and the corrugation of the elastic sidewall 52 is spirally arranged. The support block 62 is provided with support protrusions, and the support protrusions 63 cooperate with the corrugated structure on the elastic sidewall 52 in a spiral arrangement. The outer side of the cover wall 21 and the inner side of the second cover 6 are provided with guide strips that run in the same direction as the support protrusions. After blood collection, the second cover 6 is aligned with the test tube body 1 and pressed against it. When the guide strips contact, the second cover rotates slightly, and the support protrusions 63 then screw into the corrugated structure on the elastic sidewall 52, providing better support when the puncture needle pierces the first cover 1.
[0038] Preferably, the test tube body 1 is provided with a support edge 11 that cooperates with the second cap 6 to prevent the second cap 6 from pressing too deeply into the first cap 1 when it covers the test tube body 1. A cap-shaped partition is provided inside the middle section of the test tube body 1. This concentrates the collected trace blood sample and makes it easier to connect with the puncture needle.
[0039] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
[0040] Although this document frequently uses terms such as test tube body 1, support edge 11, first cover 2, cover wall 21, cover top 22, clearance notch 23, blood collection tube 3, flexible pressing structure 5, flexible pressing area 51, elastic sidewall 52, second cover 6, pressure ring 61, support block 62, and support protrusion 63, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.
Claims
1. A negative pressure self-aspirating capillary micro-blood collection tube, comprising a tube body (1), wherein a first cap (2) is provided at the opening of the tube body (1), and a blood collection tube (3) is provided on the first cap (2) penetrating the top of the first cap (2), characterized in that, The first cover (2) includes an annular cover wall (21) and a cover top (22). The cover top (22) includes a flexible pressing structure (5) located on one side of the cover top (22). The blood collection tube (3) is located on the edge of the cover top (22) and away from the flexible pressing structure (5). When the flexible pressing structure (5) is pressed, the cover top (22) tilts as a whole towards the flexible pressing structure (5) and causes the blood collection tube (3) to tilt.
2. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 1, characterized in that, The top of the cover wall (21) is higher than the side of the flexible pressing structure (5) on the side near the blood collection tube (3), and a crescent-shaped clearance notch (23) is provided on the side of the cover wall (21) near the flexible pressing structure (5).
3. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 2, characterized in that, The flexible pressing structure (5) includes a flexible pressing area (51) on the same plane as the top surface of the cover (22), and the flexible pressing area (51) is elastic and deforms when pressed.
4. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 2, characterized in that, The flexible pressing structure (5) further includes an elastic sidewall (52) located in the relief notch (23), the elastic sidewall (52) being crescent-shaped and complementary to the relief notch (23), and the wall thickness of the elastic sidewall (52) being less than that of the cover wall (21).
5. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 4, characterized in that, The elastic sidewall (52) has a corrugated shape, and the corrugation of the elastic sidewall (52) is arranged in a spiral shape.
6. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 5, characterized in that, The first cover (2) is inserted into the opening of the test tube body (1), and the first cover (2) is covered with a second cover (6), which is plugged into the test tube body (1).
7. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 6, characterized in that, The second cover (6) is provided with a pressure ring (61) extending toward the first cover (2) in the middle. The end of the pressure ring (61) near the first cover (2) abuts against the outer surface of the top cover (22). The pressure ring (61) is a through cylinder that exposes the first cover (2).
8. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 7, characterized in that, The inner wall of the second cover (6) is provided with a support block (62) that supports the elastic sidewall (52) after the second cover (6) is placed on the first cover (2). The support block (62) abuts against the outer side of the elastic sidewall (52).
9. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 8, characterized in that, The support block (62) is provided with a support protrusion. The support protrusion (63) is arranged in a spiral manner with the corrugated structure on the elastic sidewall (52). The outer side of the cover wall (21) and the inner side of the second cover body (6) are provided with guide strips that are in the same direction as the support protrusion.
10. The negative pressure self-aspiration capillary micro-blood collection tube according to claim 9, characterized in that, The test tube body (1) is provided with a support edge (11) that cooperates with the second cover (6), and a cap-shaped partition is provided inside the middle section of the test tube body (1).