A blood sample dispensing device
By designing a blood sample dispensing device that uses a handle, dispensing head, and operating rod to drive the piston, the problem of inaccurate blood sample dispensing after centrifugation was solved, achieving precise dispensing and reducing sample mixing, thus improving sample cleanliness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 日照市中心血站
- Filing Date
- 2025-09-12
- Publication Date
- 2026-07-10
AI Technical Summary
During the centrifugation process after whole blood collection, existing technologies struggle to automate and accurately distribute samples from plasma, white blood cells, and red blood cells. Manual operation can easily lead to sample mixing, affecting sample cleanliness.
A blood sample dispensing device was designed, including a handle, a dispensing head, an operating rod, and a piston. The piston is driven to slide within the handle by the operating rod. The device utilizes a threaded connection and a support cylinder structure to achieve precise sample aspiration and dispensing, avoiding mixing caused by shaking.
This method enables precise allocation of blood samples after centrifugation, avoiding sample mixing and improving sample cleanliness and allocation accuracy.
Smart Images
Figure CN224475025U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to brush-type products, specifically a blood sample dispensing device. Background Technology
[0002] In whole blood collection rooms, blood samples typically form a mixture in blood collection tubes containing anticoagulants. This mixture includes blood cells (such as red blood cells, white blood cells, and platelets) and all components of plasma. Centrifugation is generally required to separate the plasma, white blood cell and platelet layers, and red blood cell layers for testing. During testing, these layers need to be separated for individual analysis. Because centrifuge tubes have relatively small openings and the blood composition varies, automated sampling and distribution are not feasible. Instead, a test tube-like structure is used to manually aspirate each layer for analysis. However, hand tremors, disturbances, or operational errors during sampling and distribution can cause mixing between the separated samples, affecting the sample's cleanliness.
[0003] Moreover, during sampling, the samples that are closer to other layers at the bottom have higher requirements for sampling. Even slight shaking can cause the samples to mix, making it difficult to achieve accurate sampling. Utility Model Content
[0004] The purpose of this invention is to provide a blood sample dispensing device to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a blood sample dispensing device, comprising:
[0006] handle part;
[0007] The dispensing head is located below the handle and communicates with the inner cavity of the handle.
[0008] The piston is slidably mounted inside the handle.
[0009] The operating lever, with its bottom rotatably connected to the piston, is used to slide the piston inside the handle.
[0010] Preferably, the outer side of the operating lever is threaded, and a support cylinder is threadedly connected to the outer side of the operating lever.
[0011] Preferably, the support cylinder is fixedly installed on the top of the handle.
[0012] Preferably, the support cylinder is inserted into the top of the inner cavity of the handle, and limit holes are provided on the outer wall of the support cylinder and the top of the handle, and limit shafts are inserted into the limit holes.
[0013] Preferably, an axially arranged support bar is fixedly installed on the inner side wall of the handle, and support grooves are provided on both the piston and the support cylinder.
[0014] Preferably, a plug ring is fixedly installed at the bottom of the handle, and the large end of the dispensing head is plugged into the plug ring.
[0015] Preferably, the piston includes a rigid support body and a rubber block fixedly mounted to the bottom of the support body;
[0016] A protruding ring is fixedly installed at the bottom of the operating lever, and a groove matching the protruding ring is opened on the support body.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] This invention features a handle, a dispensing head, an operating rod, and a piston. The handle is placed on the centrifuge tube, ensuring stability and preventing shaking. The dispensing head, inserted into the blood sample, prevents sample mixing caused by shaking or jolting during sampling. The operating rod, carrying the piston, slides inside the handle, generating negative pressure, allowing the dispensing head to extract the blood sample. The design of the threaded outer side of the operating rod and the support cylinder allows for precise sampling and dispensing of the blood sample through micro-movements caused by the threaded design. Attached Figure Description
[0019] Figure 1 This is a structural diagram of the operating lever, handle, and distribution head of this utility model;
[0020] Figure 2 This is a structural diagram of the present utility model;
[0021] Figure 3 This is a cross-sectional view of the present invention;
[0022] Figure 4 This is a cross-sectional view of the present invention with a plug-in ring.
[0023] In the diagram: 1. Handle; 2. Distributor head; 3. Support bar; 4. Operating lever; 5. Support cylinder; 6. Piston; 61. Support body; 62. Rubber block; 7. Limiting shaft; 8. Insertion ring; 9. Support platform; 10. Support groove. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Please see Figures 1-4 As shown, this embodiment discloses a blood sample dispensing device, including:
[0026] The handle part 1 is a cylindrical structure with openings at the top and bottom. A protruding ring is fixedly installed on the top. A support platform 9 is provided on the outer side of the handle part 1, and a rubber anti-slip pad is fixedly installed on the inner wall of the support platform 9. When the support platform 9 is slid forcefully by hand, it can slide on the outer side of the handle part 1. However, when no hand force is applied, the support platform 9 will not slide on the outer side of the handle part 1 and will remain stationary on the outer side of the handle part 1.
[0027] Dispensing head 2 is located below handle part 1 and communicates with the inner cavity of handle part 1. One end of dispensing head 2 is a small end for drawing blood samples, and the other end is a large end for connecting to the bottom of handle part 1.
[0028] Specifically, such as Figures 1-3 As shown, the large end of the dispensing head 2 is fixed to the lower opening of the handle part 1 by adhesive bonding, or the handle part 1 and the dispensing head 2 are fixed together during injection molding. In this design, both the handle part 1 and the dispensing head 2 are single-use products, or they must be thoroughly disinfected after use. For details, please refer to the General Requirements for Medical Device Disinfectants GB 27949-2020.
[0029] Piston 6 is slidably mounted inside handle part 1;
[0030] The operating lever 4, with its bottom rotatably connected to the piston 6, is used to slide the piston 6 inside the handle portion 1. For example... Figure 1-3 As shown, the piston 6 includes a rigid support body 61 and a rubber block 62 (similar to the rubber inside the syringe) fixedly installed at the bottom of the support body 61. The rubber block 62 is elastic and in close contact with the inner wall of the handle part 1, which can achieve a relative seal between the handle part 1 and the piston 6, preventing air from entering the inner cavity of the handle part 1 from between the two.
[0031] The operating lever 4 has threads on its outer side, and a support cylinder 5 is threadedly connected to the outer side of the operating lever 4. The support cylinder 5 is glued and fixedly installed on the top of the handle part 1. The bottom of the operating lever 4 is fixedly connected to the support body 61.
[0032] Rotating the support cylinder 5 causes the operating rod 4 to move up and down, which in turn moves the piston 6 up and down. In this embodiment, the piston 6 rotates together with the operating rod 4 and moves up and down inside the handle portion 1. When the piston 6 moves upward, a negative pressure is generated inside the dispensing head 2, thereby generating suction and allowing direct aspiration of blood samples. Because the operating rod 4 and the support cylinder 5 are threadedly connected, the movement distance of the operating rod 4 when it is rotated is related to the thread pitch, allowing for more precise aspiration of the separated samples.
[0033] In this embodiment, it should be noted that the space in which the piston 6 moves upward should be smaller than the space inside the dispensing head 2, so as to avoid drawing too much sample into the handle part 1 during sampling, thereby avoiding contamination or infection of the handle part 1.
[0034] In a further embodiment, the support cylinder 5 is inserted into the top of the inner cavity of the handle portion 1. Limiting holes are provided on the outer wall of the support cylinder 5 and the top of the handle portion 1. A limiting shaft 7 is inserted into the limiting hole. In this embodiment, the limiting shaft 7 can be a pin or a bolt, as long as it can be inserted into the limiting hole to install the support cylinder 5 and the top of the handle portion 1 together. When the operating lever 4 is rotated, the support cylinder 5 will not rotate with the operating lever 4, thus enabling the axial lifting and lowering of the operating lever 4.
[0035] An axially arranged support bar 3 is fixedly installed on the inner wall of the handle part 1. Support grooves 10 are provided on the support body 61 of the piston 6, the rubber block 62, and the support cylinder 5. The support groove 10 of the rubber block 62 is in close contact with the support bar 3 to ensure that the two are sealed and airtight.
[0036] In this embodiment, the bottom of the operating lever 4 is rotatably connected to the bottom of the support body 61. Specifically, a protruding ring is fixedly installed on the bottom of the operating lever 4, and a groove matching the protruding ring is provided on the support body 61. When assembling the operating lever 4 and the support body 61, the bottom of the operating lever 4 is inserted into the groove of the support body 61, and then two semi-circular fixing rings (not shown in the figure) are glued on the top of the support body 61. The fixing rings cover the protruding ring of the operating lever 4 in the groove, thereby rotatably installing the operating lever 4 and the support body 61 together.
[0037] In this embodiment, when the operating lever 4 is rotated, the piston 6 does not rotate with the operating lever 4, but only moves axially with the operating lever 4.
[0038] This embodiment has two usage methods:
[0039] One method involves fixing the support cylinder 5 to the top of the handle part 1, i.e., the limiting shaft 7 connects the support cylinder 5 and the handle part 1 together. When the operating rod 4 rotates, it causes the piston 6 to move up and down inside the handle part 1. When the operating rod 4 rotates, the screw thread enables precise sample aspiration, especially for centrifuged blood samples. Blood samples (with anticoagulant) will be divided into: the uppermost layer, usually a pale yellow transparent liquid containing water, plasma globulins, serum proteins, inorganic salts, etc.; the middle layer, consisting of white blood cells and platelets, usually a thin white layer, mainly containing neutrophils, basophils, monocytes, etc., as well as platelets; and the lowermost layer, mainly composed of red blood cells, which is dark red.
[0040] The blood after stratification needs to be precisely drawn to avoid drawing substances from other layers. Therefore, rotating the operating lever 4 and slowly moving the piston 6 can achieve precise drawing and dispensing of the plasma sample.
[0041] The second method involves a sliding connection between the support cylinder 5 and the top of the handle 1. Specifically, the limiting shaft 7 is inserted only into the limiting hole of the handle 1, while the other part is inserted into the limiting hole of the support cylinder 5. The support cylinder 5 can slide up and down inside the handle 1. For simple blood samples (i.e., centrifuged blood), where sample distribution accuracy is not critical, the operating rod 4 can be pulled upwards. Under the action of the thread, the operating rod 4 will move the support cylinder 5 upwards, simultaneously moving the piston 6 upwards, thus achieving rapid aspiration of the blood sample.
[0042] When the operating lever 4 is pulled or pressed, the force on the support cylinder 5 is along the axial direction of the operating lever 4, and there is no relative movement between the support cylinder 5 and the operating lever 4. Under the action of the thread, there is no relative movement between the support cylinder 5 and the operating lever 4. When the operating lever 4 moves upward, the piston 6 and the support groove 10 of the support cylinder 5 are always aligned vertically. When pressed, the support groove 10 of the support cylinder 5 and the support bar 3 are always aligned and there is no offset.
[0043] To prevent the support cylinder 5 from affecting the axial pulling or pressing movement of the operating lever 4, after the limiting shaft 7 separates from the limiting hole of the support cylinder 5, the operating lever 4 can be pulled upwards slightly, and the support cylinder 5 can slide out from the handle part 1. The support cylinder 5 can be manually rotated to the top of the operating lever 4. When pressing, this can reduce or prevent the support cylinder 5 from entering the interior of the handle part 1 and affecting the movement of the operating lever 4.
[0044] When the support cylinder 5 needs to be installed inside the handle part 1, rotate the support cylinder 5 so that the support cylinder 5 moves downward on the operating rod 4 and the support groove 10 of the support cylinder 5 is aligned with the support bar 3. Then press down on the operating rod 4 to install the support cylinder 5 inside the handle part 1. Then the limiting shaft 7 can be inserted into the limiting hole of the support cylinder 5 to fix the support cylinder 5 and the handle part 1 together.
[0045] In a further embodiment, to reduce costs, the dispensing head 2 is designed as a replaceable disposable product. A connector ring 8 is fixedly installed at the bottom of the handle portion 1. The larger end of the dispensing head 2 is inserted into the connector ring 8. A rubber ring is fixedly provided on the inner wall of the connector ring 8. When the larger end of the dispensing head 2 is inserted into the connector ring 8, the rubber ring is compressed to seal the connection and prevent air from entering. Because the bottom of the dispensing head 2 is open, there is no air leakage between the connector ring 8 and the dispensing head 2 when drawing samples.
[0046] In this embodiment, the dispensing head 2 is a replaceable disposable item. When extracting different samples, it is necessary to replace the dispensing head 2 with a different one. At the same time, the handle part 1 needs to be disinfected to reduce cross-infection between samples.
[0047] The specific usage method is as follows: When using, according to the stratified blood sample (such as the position of plasma, or the lowest position), manually slide the support platform 9 forcefully so that the distance from the bottom of the support platform 9 to the middle of the plasma is exactly the same as the distance from the bottom of the dispensing head 2 to the support platform 9. Then, slowly put the dispensing head 2 into the centrifuged test tube. While the support platform 9 rests on the top of the test tube, the bottom of the dispensing head 2 is inserted into the middle of the plasma. Then, hold the support platform 9 and the handle 1 with one hand to make the handle 1 and the dispensing head 2 stable and not shake. With the other hand, slowly rotate the operating lever 4 or slowly pull the operating lever 4 upward. The operating lever 4 moves the piston 6 upward, and the handle creates negative pressure, allowing the dispensing head 2 to draw up the plasma.
[0048] When dispensing plasma, the dispensing head 2 is positioned facing the slide or testing stage. One hand holds the handle 1, while the other hand rotates the operating lever 4. The operating lever 4 moves downward, causing the piston 6 to move downward as well. This increases the internal pressure of the dispensing head 2, allowing the serum to flow out from the dispensing head 2.
[0049] When dispensing plasma onto a glass slide or testing stage, it can also be operated with one hand. During operation, the limiting shaft 7 needs to be pulled out of the limiting hole of the support cylinder 5. Then, the handle part 1 can be held with four fingers, and the top of the operating rod 4 can be pressed with the thumb. This will cause the piston 6 to move downward inside the handle part 1, thereby causing the blood sample in the dispensing head 2 to flow out.
[0050] It should be noted that the above methods can be used according to the different user habits, without too many restrictions.
[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A blood sample dispensing device, characterized in that, include: handle part(1); The dispensing head (2) is located below the handle part (1) and communicates with the inner cavity of the handle part (1); The piston (6) is slidably mounted inside the handle (1); The operating lever (4) is rotatably connected to the piston (6) at its bottom, and is used to slide the piston (6) inside the handle part (1).
2. The blood sample dispensing device according to claim 1, characterized in that: The operating lever (4) has a thread on its outer side, and a support cylinder (5) is threadedly connected to the outer side of the operating lever (4).
3. A blood sample dispensing device according to claim 2, characterized in that: The support cylinder (5) is fixedly installed on the top of the handle part (1).
4. A blood sample dispensing device according to claim 2, characterized in that: The support cylinder (5) is inserted into the top of the inner cavity of the handle part (1). Limiting holes are provided on the outer side wall of the support cylinder (5) and the top of the handle part (1), and a limiting shaft (7) is inserted into the limiting hole.
5. A blood sample dispensing device according to claim 4, characterized in that: The inner wall of the handle (1) is fixedly equipped with an axially arranged support bar (3), and the piston (6) and the support cylinder (5) are both provided with support grooves (10).
6. A blood sample dispensing device according to claim 5, characterized in that: A plug ring (8) is fixedly installed at the bottom of the handle part (1), and the large end of the dispensing head (2) is plugged into the plug ring (8).
7. A blood sample dispensing device according to claim 1, characterized in that: The piston (6) includes a rigid support (61) and a rubber block (62) fixedly mounted to the bottom of the support (61); A protruding ring is fixedly installed at the bottom of the operating lever (4), and a groove matching the protruding ring is provided on the support body (61).
8. A blood sample dispensing device according to claim 1, characterized in that: A support platform (9) is slidably mounted on the outer side of the handle part (1).