Blood extracting and filtering device for department of hematology

Abstract

The invention discloses a blood extracting and filtering device for the hematology department, and belongs to the technical field of medical auxiliary instruments.The blood extracting and filtering device comprises a sterile filter cartridge, the upper end of the sterile filter cartridge is in threaded connection with a sealing upper cover, the sealing upper cover communicates with a liquid inlet pipe, and the lower end of the sterile filter cartridge is connected with a liquid discharging pipe; meanwhile, a filter assembly is arranged on the inner side of the sterile filter cartridge; the filter assembly comprises a flow guide part arranged on the inner side of the sterile filter cylinder, a primary filter screen is fixedly installed at the upper end of the flow guide part, a lower pipe part is arranged on the lower portion of the flow guide part, the outer side of the lower pipe part is sleeved with an upper seat body, the lower end of the upper seat body is fixedly connected with a purification filter element, and the lower end of the purification filter element is fixedly connected with a lower seat body. According to the blood extracting and filtering device for the hematology department, multiple filtering can be conducted on blood, the filtering and purifying effect is effectively ensured, automatic cleaning and dredging can be achieved in the blocking filtering process, and long-term effective filtering is ensured.

Description

Technical Field

[0001] This invention relates to the field of medical auxiliary device technology, specifically a blood extraction and filtration device for hematology. Background Technology

[0002] In clinical diagnosis and research in hematology, blood sample collection and filtration are crucial steps. The accuracy, efficiency, and safety of these procedures directly impact disease diagnosis, condition assessment, and treatment planning. Currently, the commonly used clinical blood collection and filtration procedures are performed in steps. First, blood is drawn using tools such as syringes or vacuum blood collection tubes. Then, the drawn blood is transferred to a dedicated filtration device (such as centrifuge tubes with primary filters or filter funnels) to remove impurities, clots, cell debris, and other interfering components. However, this step-by-step approach has several drawbacks: First, the increased contact between the blood and the external environment during multiple transfers increases the risk of introducing bacteria, dust, and other contaminants, leading to sample contamination and affecting the reliability of test results. Second, the cumbersome procedures prolong sample processing time, which, especially in emergency situations, may delay the diagnosis.

[0003] Existing technology (Chinese patent publication number: CN218475122U, publication date: 2023-02-14) discloses a blood filtration device, including a dust cover, a filter, a V-shaped tube, and a reagent cup. The reagent cup is fitted around one end of the V-shaped tube, and the inner wall of the reagent cup is screwed to the outer wall of the V-shaped tube. A filter membrane cap is fitted around the other end of the V-shaped tube. A filter is located at the end of the V-shaped tube near the filter membrane cap, and the filter membrane cap snaps into the filter. Blood enters the V-shaped tube from the reagent cup, is filtered by the filter, and then flows out. The addition of a filter at the end of the V-shaped tube utilizes physical separation to retain red blood cells and white blood cells in whole blood, without hemolysis, and with a high plasma recovery rate. This device can achieve blood filtration, rapidly separate whole blood in a short time, and has high separation efficiency. It has important application value for the detection of nutrients in blood and for certain diseases requiring timely detection, with a wide range of applications and broad application prospects.

[0004] The prior art (Chinese patent publication number: CN221932711U, publication date: 2024-11-01) discloses a filtration device for a blood perfusion machine, including a filter canister. A canister lid is threadedly connected to the upper end of the filter canister. Multiple connecting plates are fixedly connected to the inner wall of the filter canister. A moving rod is slidably connected to the middle of the upper surface of the connecting plates. A placement ring is fixedly connected to the upper end of the moving rod. A first spring is fixedly connected to the upper surface of the connecting plates, and the upper end of the first spring is fixedly connected to the placement ring. A primary filter membrane is disposed on the upper surface of the placement ring. Multiple pressing components are disposed on the lower surface of the canister lid. In this application, the primary filter membrane can be placed on the placement ring by the cooperation of the connecting plates, the moving rod, the first spring, and the placement ring. Simultaneously, the primary filter membrane placed on the placement ring can be fixed by the cooperation of the fixed rod, the sliding rod, the second spring, and the pressing block, thereby facilitating the cleaning or replacement of the primary filter membrane.

[0005] While existing blood extraction and filtration devices can extract and filter blood, they cannot automatically clean the filter structure during the blood extraction process and require manual cleaning after disassembly. This can easily lead to clogging of the filter structure, affecting blood extraction efficiency and presenting certain usage defects. Summary of the Invention

[0006] The purpose of this invention is to provide a blood extraction and filtration device for hematology, in order to solve the problems currently found in the market as described in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a blood extraction and filtration device for hematology, comprising a sterile filter cartridge, a sealing cap threadedly connected to the upper end of the sterile filter cartridge, an inlet pipe connected to the sealing cap, and a drain pipe connected to the lower end of the sterile filter cartridge, and a filtration assembly disposed on the inner side of the sterile filter cartridge; the filtration assembly includes a flow guide disposed on the inner side of the sterile filter cartridge, a primary filter screen fixedly installed at the upper end of the flow guide, and a lower tube portion disposed at the lower part of the flow guide, an upper seat body sleeved on the outer side of the lower tube portion, a purification filter element fixedly connected to the lower end of the upper seat body, and a lower seat body fixedly connected to the lower end of the purification filter element, and a sealing plug penetratingly connected to the sterile filter cartridge and the lower seat body, a pressure regulating component for driving cleaning elastically slidably disposed on the inner side of the lower tube portion, a first cleaning component connected between the primary filter screen and the pressure regulating component, and a second cleaning component for clearing blockages elastically lifted and lowered disposed on the inner side of the purification filter element.

[0008] Preferably, the sterile filter cartridge and the flow guide are coaxially arranged, the flow guide is funnel-shaped, and the primary filter is spherical. The primary filter filters the blood drawn in through the inlet tube.

[0009] Preferably, the pressure regulating component includes a sliding ring that is slidably mounted on the inner side of the lower tube, and the inner side of the sliding ring is uniformly provided with sealing diaphragms that seal against each other, and a first spring is fixedly connected between the sliding ring and the lower end of the lower tube.

[0010] Preferably, the sliding ring slides down along the lower tube under negative pressure, and when the sliding ring moves down to the lower part of the lower tube, the sealing diaphragm undergoes elastic deformation under pressure, and when the sealing diaphragm deforms, blood is transported through the inner side of the sliding ring.

[0011] Through the above technical solution, the blood drawn from the inlet tube will be filtered through the primary filter and then enter the inner side of the purification filter element through the convergence of the guide component. After filtration, it will re-enter the sterile filter cartridge and be discharged through the drain tube, thus achieving multi-stage filtration.

[0012] Preferably, the first cleaning component includes a first magnetic block fixedly mounted above the sliding ring by a bracket, a rotating shaft is rotatably disposed through the center of the primary filter, and a second magnetic sheet is sleeved on the outside of the rotating shaft, and the first magnetic block and the second magnetic sheet are magnetically attracted to each other.

[0013] Preferably, a second spring is fixedly connected between the primary filter and the second magnetic sheet, and a ball bearing is embedded in the inner wall of the through hole of the second magnetic sheet. A spiral guide groove is provided at the lower end of the rotating shaft. When the second magnetic sheet is raised or lowered, the ball bearing slides along the guide groove. A cleaning scraper is fixedly connected to the outer side of the upper end of the rotating shaft, and the cleaning scraper is attached to the upper surface of the primary filter.

[0014] Through the above technical solution, the first magnetic block and the second magnetic sheet are separated. At this time, the second magnetic sheet will move upward under the elastic force of the second spring, so that the rotating shaft drives the cleaning scraper to rotate, thereby achieving the initial cleaning of the primary filter.

[0015] Preferably, a striking rod is uniformly fixedly installed on the upper surface of the second magnetic sheet, and the striking rod strikes the lower surface of the primary filter screen during the elastic upward movement of the second magnetic sheet, and the primary filter screen achieves auxiliary cleaning of blockage through vibration.

[0016] Preferably, the second cleaning component includes an inner scraper that is slidably installed inside the purification filter element, and a third spring is fixedly connected between the upper end of the inner scraper and the upper seat body, and a pull rope is fixedly connected between the upper end of the inner scraper and the sliding ring. At the same time, during the downward movement of the sliding ring, the inner scraper moves upward under the elastic force of the third spring.

[0017] Through the above technical solution, the downward movement of the sliding ring allows the inner scraper to move upward under the elastic force of the third spring. After the blood filtration is completed, the sliding ring resets, causing it to pull the inner scraper downward synchronously via the pull rope, thereby achieving automatic cleaning of the filtered material inside the purification filter element.

[0018] Preferably, the inner scraper is attached to the inner wall of the purification filter element, and the inner scraper scrapes off the filtered material from the inner wall of the purification filter element during the downward movement of the inner scraper, and the sealing plug, the sterile filter cartridge, and the lower seat are connected by threaded seals.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the blood extraction and filtration device for hematology can perform multiple filtrations on blood, effectively ensuring the filtration and purification effect, and can automatically clean and unblock during the filtration clogging process, ensuring long-term effective filtration. The specific details are as follows: 1. Equipped with a flow guide, a pre-filter, and a purification filter cartridge, the blood drawn from the inlet pipe will pass through the pre-filter and then enter the inner side of the purification filter cartridge through the flow guide. After passing through the filter, it will re-enter the sterile filter cartridge and be discharged through the drain pipe, achieving multi-stage filtration and effectively ensuring the filtration effect of the blood.

[0020] 2. The system is equipped with a sliding ring, a first magnetic block, a rotating shaft, and a second magnetic sheet. Under negative pressure, the sliding ring moves downward, causing the first magnetic block to move downward synchronously, thus separating the first magnetic block from the second magnetic sheet. At this time, the second magnetic sheet moves upward under the elastic force of the second spring, causing the rotating shaft to drive the cleaning scraper to rotate, achieving initial cleaning of the primary filter. When the primary filter becomes clogged during subsequent use, the sliding ring moves upward due to the decrease in delivery pressure. When the first magnetic block and the second magnetic sheet approach and adhere again, the second magnetic sheet will drive the rotating shaft to rotate again, achieving automatic cleaning and anti-clogging. During the elastic upward movement of the second magnetic sheet, the striking rod strikes the lower surface of the primary filter, and the primary filter is vibrated to assist in clearing the clog.

[0021] 3. It is equipped with a sliding ring and an inner scraper. As the sliding ring moves down, the inner scraper moves up under the elastic force of the third spring. After the blood filtration is completed, the sliding ring resets, causing it to pull the inner scraper down synchronously via a pull rope, thereby achieving automatic cleaning of the filtered material inside the purification filter element.

[0022] Furthermore, when the sliding ring moves upward, it can drive the fluid movement inside the sterile filter cartridge, thereby achieving backwashing of the pre-filter and the purification filter element, which further improves the filtration effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from a bottom view; Figure 3 This is a schematic cross-sectional view of the aseptic filter cartridge of the present invention; Figure 4 This is a schematic diagram of the main cross-sectional structure of the present invention; Figure 5 This is a schematic cross-sectional view of the flow guide and primary filter of the present invention; Figure 6 This is a schematic diagram of the shaft mounting structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 This is a schematic diagram of the connection structure between the purification filter element and the inner scraper of the present invention.

[0024] In the diagram: 1. Sterile filter cartridge; 2. Sealed top cover; 3. Inlet pipe; 4. Drain pipe; 5. Flow guide; 501. Lower pipe section; 6. Primary filter screen; 7. Upper seat; 8. Purification filter element; 9. Lower seat; 10. Sealing plug; 11. Sliding ring; 12. Sealing diaphragm; 13. First spring; 14. First magnetic block; 15. Rotating shaft; 1501. Unclogging scraper; 16. Second spring; 17. Second magnetic plate; 18. Ball bearing; 19. Guide groove; 20. Striking rod; 21. Inner scraper; 22. Third spring; 23. Pull rope. Detailed Implementation

[0025] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1: Existing blood extraction and filtration devices have a simple filtration structure and cannot achieve efficient multi-stage filtration. To solve this technical problem, this example discloses the following technical content. Please refer to [link / reference]. Figures 1-5 As shown; a blood extraction and filtration device for hematology includes a sterile filter cartridge 1, a sealing cover 2 threadedly connected to the upper end of the sterile filter cartridge 1, and an inlet pipe 3 connected to the sealing cover 2. The lower end of the sterile filter cartridge 1 is connected to a drain pipe 4. A filter assembly is provided inside the sterile filter cartridge 1. The filter assembly includes a flow guide 5 disposed inside the sterile filter cartridge 1. A primary filter screen 6 is fixedly installed at the upper end of the flow guide 5. A lower tube 501 is provided at the lower part of the flow guide 5. An upper seat 7 is sleeved on the outer side of the lower tube 501. A purification filter element 8 is fixedly connected to the lower end of the upper seat 7. A lower seat 9 is fixedly connected to the lower end of the purification filter element 8. A sealing plug 10 is connected through the sterile filter cartridge 1 and the lower seat 9.

[0027] The sterile filter cartridge 1 and the flow guide 5 are coaxially arranged, and the flow guide 5 is arranged in a funnel shape. The primary filter 6 is arranged in a spherical arc shape. The primary filter 6 filters the blood drawn in by the inlet tube 3. The pressure regulating component includes a sliding ring 11 that is slidably installed inside the lower tube 501. The inner side of the sliding ring 11 is uniformly provided with sealing diaphragms 12 that are mutually sealed and fitted. A first spring 13 is fixedly connected between the sliding ring 11 and the lower end of the lower tube 501. The sliding ring 11 slides down along the lower tube 501 under negative pressure. When the sliding ring 11 moves down to the lower part of the lower tube 501, the sealing diaphragm 12 undergoes elastic deformation under pressure. When the sealing diaphragm 12 deforms, the blood is transported through the inner side of the sliding ring 11.

[0028] Turn on the blood extraction device so that blood enters the inside of the sterile filter cartridge 1 through the inlet pipe 3. At this time, the primary filter 6 can perform primary filtration of the blood. The blood will converge through the guide 5 and enter the inside of the lower tube 501. At the same time, the sliding ring 11 and the sealing diaphragm 12 move downward under the action of fluid pressure. When the sliding ring 11 can no longer move downward inside the lower tube 501, the sealing diaphragm 12 will undergo elastic deformation, so that the blood can enter the inside of the purification filter element 8 through the sliding ring 11. The blood is then filtered again by the purification filter element 8. After filtration, the blood will enter the sterile filter cartridge 1 and be discharged through the drain pipe 4, realizing multi-stage filtration.

[0029] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. Existing blood extraction and filtration devices are inconvenient for automatic cleaning and anti-clogging of the filtration mechanism. To further solve this technical problem, this example discloses the following technical content, such as... Figures 4-8 As shown; a first cleaning component is connected between the pre-filter 6 and the pressure regulating component; a second cleaning component for unclogging is elastically installed on the inner side of the purification filter element 8. The first cleaning component includes a first magnetic block 14 fixedly mounted above the sliding ring 11 via a bracket; a rotating shaft 15 is rotatably disposed through the center of the pre-filter 6; a second magnetic sheet 17 is sleeved on the outer side of the rotating shaft 15; the first magnetic block 14 and the second magnetic sheet 17 are magnetically attracted to each other; a second spring 16 is fixedly connected between the pre-filter 6 and the second magnetic sheet 17; and the second magnetic sheet... A ball bearing 18 is embedded in the inner wall of the through hole of the second magnetic sheet 17, and a spiral guide groove 19 is provided at the lower end of the rotating shaft 15. When the second magnetic sheet 17 is raised and lowered, the ball bearing 18 slides along the guide groove 19. A cleaning scraper 1501 is fixedly connected to the outer side of the upper end of the rotating shaft 15, and the cleaning scraper 1501 is attached to the upper surface of the primary filter screen 6. A knocking rod 20 is evenly fixedly installed on the upper surface of the second magnetic sheet 17. During the elastic upward movement of the second magnetic sheet 17, the knocking rod 20 knocks on the lower surface of the primary filter screen 6, and the primary filter screen 6 achieves auxiliary cleaning through vibration.

[0030] The second cleaning component includes an inner scraper 21 slidably installed inside the purification filter element 8, and a third spring 22 is fixedly connected between the upper end of the inner scraper 21 and the upper seat 7. A pull rope 23 is fixedly connected between the upper end of the inner scraper 21 and the sliding ring 11. During the downward movement of the sliding ring 11, the inner scraper 21 moves upward under the elastic force of the third spring 22. The inner scraper 21 adheres to the inner wall of the purification filter element 8, and scrapes off the filtered material from the inner wall of the purification filter element 8 during the downward movement of the inner scraper 21. The sealing plug 10, the sterile filter cartridge 1, and the lower seat 9 are threadedly sealed together.

[0031] The sliding ring 11 moves downward under negative pressure, causing the first magnetic block 14 to move downward synchronously, causing the first magnetic block 14 and the second magnetic sheet 17 to separate. At this time, the second magnetic sheet 17 moves upward under the elastic force of the second spring 16. The ball bearing 18 rolls along the spiral guide groove 19, thereby driving the rotating shaft 15 to rotate. The rotating shaft 15 drives the cleaning scraper 1501 to rotate, achieving initial cleaning of the primary filter 6. When the primary filter 6 becomes clogged during subsequent use, the sliding ring 11 moves upward due to the decrease in delivery pressure. When the first magnetic block 14 and the second magnetic sheet 17 approach and adhere again, the second magnetic sheet 17 will drive the rotating shaft 15 to rotate again, achieving automatic cleaning and anti-clogging. At the same time, during the elastic upward movement of the second magnetic sheet 17, the striking rod 20 strikes the lower surface of the primary filter 6, and the primary filter 6 achieves auxiliary cleaning through vibration.

[0032] like Figure 8 As shown, as the sliding ring 11 moves downward, the inner scraper 21 moves upward under the elastic force of the third spring 22. After the blood filtration is completed, the sliding ring 11 resets, causing it to pull the inner scraper 21 downward synchronously via the pull rope 23, thereby achieving automatic cleaning of the filtered material inside the purification filter element 8. When the sliding ring 11 moves upward, it can drive the fluid movement inside the sterile filter cartridge 1, achieving backwashing of the pre-filter 6 and the purification filter element 8, thereby further improving the filtration effect. Subsequently, the filtered material can be easily removed by rotating and unscrewing the sealing plug 10.

[0033] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A blood extraction and filtration device for hematology, comprising a sterile filter cartridge (1), wherein a sealing cover (2) is threadedly connected to the upper end of the sterile filter cartridge (1), and an inlet pipe (3) is connected to the sealing cover (2), and a drain pipe (4) is connected to the lower end of the sterile filter cartridge (1), and a filtration assembly is provided on the inner side of the sterile filter cartridge (1). Its features are, The filter assembly includes a flow guide (5) disposed inside the sterile filter cartridge (1), and a primary filter (6) is fixedly installed at the upper end of the flow guide (5). A lower tube (501) is provided at the lower part of the flow guide (5). An upper seat (7) is sleeved on the outer side of the lower tube (501). A purification filter element (8) is fixedly connected at the lower end of the upper seat (7). A lower seat (9) is fixedly connected at the lower end of the purification filter element (8). A sealing plug (10) is connected through the sterile filter cartridge (1) and the lower seat (9). A pressure regulating component for driving cleaning is elastically slidably disposed inside the lower tube (501). A first cleaning component is connected between the primary filter (6) and the pressure regulating component. A second cleaning component for clearing blockage is elastically lifted and lowered inside the purification filter element (8).

2. The blood extraction and filtration device for hematology according to claim 1, characterized in that: The sterile filter cartridge (1) and the flow guide (5) are coaxially arranged, and the flow guide (5) is arranged in a funnel shape, and the primary filter (6) is arranged in a spherical arc shape. At the same time, the primary filter (6) filters the blood drawn in by the inlet pipe (3).

3. The blood extraction and filtration device for hematology according to claim 1, characterized in that: The pressure regulating assembly includes a sliding ring (11) that is slidably mounted on the inner side of the lower tube (501), and a sealing diaphragm (12) that is mutually sealed and fitted is evenly arranged on the inner side of the sliding ring (11), and a first spring (13) is fixedly connected between the sliding ring (11) and the lower end of the lower tube (501).

4. A blood extraction and filtration device for hematology according to claim 3, characterized in that: The sliding ring (11) slides down along the lower tube (501) under negative pressure. When the sliding ring (11) moves down to the lower part of the lower tube (501), the sealing diaphragm (12) undergoes elastic deformation under pressure. When the sealing diaphragm (12) deforms, blood is transported through the inside of the sliding ring (11).

5. A blood extraction and filtration device for hematology according to claim 1, characterized in that: The first cleaning component includes a first magnetic block (14) fixedly mounted above a sliding ring (11) by a bracket. A rotating shaft (15) is rotatably disposed through the center of the primary filter (6), and a second magnetic sheet (17) is sleeved on the outside of the rotating shaft (15). The first magnetic block (14) and the second magnetic sheet (17) are magnetically attracted to each other.

6. A blood extraction and filtration device for hematology according to claim 5, characterized in that: A second spring (16) is fixedly connected between the primary filter (6) and the second magnetic sheet (17), and a ball bearing (18) is embedded in the inner wall of the through hole of the second magnetic sheet (17). A spiral guide groove (19) is opened at the lower end of the rotating shaft (15). When the second magnetic sheet (17) is raised and lowered, the ball bearing (18) slides along the guide groove (19). A cleaning scraper (1501) is fixedly connected to the outer side of the upper end of the rotating shaft (15), and the cleaning scraper (1501) is attached to the upper surface of the primary filter (6).

7. A blood extraction and filtration device for hematology according to claim 5, characterized in that: A striking rod (20) is uniformly fixed on the upper surface of the second magnetic sheet (17), and the striking rod (20) strikes the lower surface of the primary filter (6) during the elastic upward movement of the second magnetic sheet (17), and the primary filter (6) achieves auxiliary cleaning through vibration.

8. A blood extraction and filtration device for hematology according to claim 1, characterized in that: The second cleaning component includes an inner scraper (21) that is slidably installed inside the purification filter (8), and a third spring (22) is fixedly connected between the upper end of the inner scraper (21) and the upper seat (7), and a pull rope (23) is fixedly connected between the upper end of the inner scraper (21) and the sliding ring (11). At the same time, during the downward movement of the sliding ring (11), the inner scraper (21) moves upward under the elastic force of the third spring (22).

9. A blood extraction and filtration device for hematology according to claim 8, characterized in that: The inner scraper (21) is attached to the inner wall of the purification filter element (8), and the inner scraper (21) scrapes off the filtered material from the inner wall of the purification filter element (8) during the downward movement. The sealing plug (10), the sterile filter cartridge (1), and the lower seat (9) are connected by threaded seals.

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