A structure for transferring and dispensing blood from a blood collection tube without opening the cap

Abstract

This invention discloses a structure for transferring and dispensing blood from a blood collection tube without opening the cap, belonging to the field of medical auxiliary device technology. It includes a syringe, a first piston rod, and a second piston rod. The pistons of the first and second piston rods slide freely left and right within the syringe. A blood collection tube is connected to the top of the syringe, with the connection point between the blood collection tube and the syringe forming the upper opening. A first through-hole is provided above the syringe, and a steel needle a is placed inside the first through-hole, leading into the blood collection tube. A second through-hole is also provided next to the first through-hole above the syringe, and a steel needle b is placed inside the second through-hole, leading to the atmosphere. A third through-hole is provided below the syringe tube, connecting to the lower opening. This invention simply achieves a fixed-volume liquid dispensing process without spatial changes, eliminating the need for pipettes and pipette tips, and also eliminating the "capping" step of the blood collection tube, allowing for direct operation. It can dispense small, quantitative amounts of blood from the blood collection tube, is simple and convenient, and is suitable for situations where specific indicators need to be tested immediately.

Description

Technical Field

[0001] This invention belongs to the field of medical auxiliary device technology, specifically relating to a structure for transferring and distributing blood from a blood collection tube without opening the cap. Background Technology

[0002] After blood is collected from a blood collection tube, it needs to be transferred and separated during experimental procedures. Typically, the method for separating the liquid can be similar to that of a pipette, where a certain volume is pre-filled, and then the liquid is transferred out. However, this requires a large container to hold the liquid, such as the tube after the cap is removed. Alternatively, a pump-like method can be used, similar to a syringe pump, which advances liquid at a controlled rate, for a specified length or time, resulting in a controlled volume of liquid expelled. Another method is similar to a peristaltic pump, which uses time and rotation speed to control the amount of liquid dispensed.

[0003] The above operations require centralized operation using large laboratory equipment such as "capped centrifuges". Therefore, it is advisable to process a batch of blood collection tubes in bulk. This is suitable for large central laboratories, but it has its limitations in more flexible situations, such as when specific test samples or indicators are tested on demand. Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses a structure for transferring and distributing blood from a blood collection tube without opening the cap. This structure can transfer blood from a single blood collection tube and distribute it when necessary. It is convenient to combine with other microfluidic chip modules, such as gate valves, check valves, reservoirs, pumps, etc., to achieve low-cost detection on microfluidic chips or microstructures.

[0005] To achieve the above objectives, the specific technical solution of this application is as follows:

[0006] A structure for transferring and dispensing blood from a blood collection tube without opening the cap includes a syringe, a first piston rod, and a second piston rod. The first and second piston rods are coaxially arranged opposite each other on both sides of the syringe, and the pistons of the first and second piston rods slide freely left and right inside the syringe. A blood collection tube is connected to the top of the syringe, with the connection between the blood collection tube and the syringe forming an upper opening. A first through hole is provided above the syringe, and a steel needle a is provided inside the first through hole, leading into the blood collection tube. A second through hole is also provided next to the first through hole above the syringe, and a steel needle b is provided inside the second through hole, leading to the atmosphere. A third through hole is provided below the syringe tube, connecting to the lower opening.

[0007] Based on the above technical features, the first piston push rod is further provided with a first limiting block, which is located inside the syringe. When the first limiting block contacts the syringe, the piston of the first piston push rod is located just below the upper opening of the syringe.

[0008] Based on the above technical features, the second piston push rod is further provided with a second limiting block, which is located outside the syringe. When the second limiting block contacts the syringe, the piston of the second piston push rod is located just below the upper opening of the syringe.

[0009] Based on the above technical features, the first piston push rod is further provided with a third limiting block, which is located outside the syringe. When the third limiting block contacts the syringe, the piston of the first piston push rod is located just above the lower opening of the syringe.

[0010] Based on the above technical features, the second piston push rod is further provided with a fourth limiting block, which is located inside the syringe. When the fourth limiting block contacts the syringe, the piston of the second piston push rod is located just above the lower opening of the syringe.

[0011] Based on the above technical features, preferably, the syringe is made of transparent PVC material.

[0012] Compared with the prior art, the beneficial effects of this application are as follows:

[0013] This application features a simple structure that enables the precise dispensing of liquid in fixed volumes. It eliminates the need for instruments like pipettes and pipette tips, as well as the need to remove the caps from blood collection tubes. It allows for direct operation and enables the dispensing of small, quantitative amounts of blood from blood collection tubes. It is simple, convenient, and suitable for situations where specific indicators need to be tested on demand. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the initial state of a structure for transferring and distributing blood from a blood collection tube without opening the cap, according to the present invention.

[0015] Figure 2 This is a schematic diagram of the liquid distribution state of a structure for transferring and distributing blood from a blood collection tube without opening the cap according to the present invention;

[0016] Figure 3 This is a schematic diagram of the completed liquid dispensing state of a structure for transferring and dispensing blood from a blood collection tube without opening the cap according to the present invention.

[0017] Figure 4 This is a three-dimensional structural diagram of a structure for transferring and distributing blood from a blood collection tube without opening the cap, according to the present invention.

[0018] List of identifiers in attached diagrams:

[0019] 1. Syringe; 101. First through hole; 102. Second through hole; 103. Third through hole; 2. First piston rod; 3. Second piston rod; 4. Blood collection tube; 5. Steel needle a; 6. Steel needle b; 7. Upper opening; 8. Lower opening; 9. First limiting block; 10. Second limiting block; 11. Third limiting block; 12. Fourth limiting block. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 1-4 The present invention will be further illustrated by the following specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] It should be noted that the terms "up", "down", "left", "right", "front" and "back" used in the following description refer to the directions in the attached diagram, while the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0022] like Figure 1-4 As shown, a structure for transferring and distributing blood from a blood collection tube without opening the cap includes a syringe 1, a first piston rod 2 and a second piston rod 3. The first piston rod 2 and the second piston rod 3 are coaxially arranged opposite each other on both sides of the syringe 1, and the pistons of the first piston rod 2 and the second piston rod 3 can slide freely left and right inside the syringe 1.

[0023] A blood collection tube 4 is detachably connected to the top of the syringe 1, and the connection between the blood collection tube 4 and the syringe 1 is the upper opening 7. A first through hole 101 is provided above the syringe 1, and a steel needle a5 is disposed within the first through hole 101, the steel needle a5 leading into the blood collection tube 4. A second through hole 102 is also provided next to the first through hole above the syringe 1, and a steel needle b6 is disposed within the second through hole 102, the steel needle b6 leading to the atmosphere. A third through hole 103 is provided below the syringe tube 1, and the third through hole 103 connects to the lower opening 8.

[0024] Furthermore, the first piston push rod 2 is provided with a first limiting block 9, which is located inside the syringe 1. When the first limiting block 9 contacts the syringe 1, the piston of the first piston push rod 2 is located just below the upper opening 7 of the syringe.

[0025] Furthermore, the second piston push rod 3 is provided with a second limiting block 10, which is located outside the syringe 1. When the second limiting block 10 contacts the syringe 1, the piston of the second piston push rod 3 is located just below the upper opening 7 of the syringe.

[0026] Furthermore, the first piston push rod 2 is provided with a third limiting block 11, which is located outside the syringe. When the third limiting block contacts the syringe, the piston of the first piston push rod is located above the lower opening 8 of the syringe.

[0027] Furthermore, the second piston push rod 3 is provided with a fourth limiting block 12, which is located inside the syringe 1. When the fourth limiting block 12 contacts the syringe 1, the piston of the second piston push rod 3 is located just above the lower opening 8 of the syringe.

[0028] Preferably, the first limiting block 9, the second limiting block 10, the third limiting block 11, and the fourth limiting block 12 are ring structures.

[0029] Preferably, the syringe 1 is made of a transparent material to facilitate observation of the liquid collection and separation process.

[0030] Working principle:

[0031] The initial state is that the first and second piston rods are aligned and positioned below the upper opening of the syringe. At this point, the blood collection tube is inserted into the upper opening of the syringe through the steel needle a, ensuring an airtight seal. During use, first pull the second piston rod to the right, stopping it above the lower right opening of the syringe. The volume between the upper and lower openings of the syringe is now filled with the liquid drawn from the blood collection tube. If the first piston rod is then pushed to the right, since it has already passed the upper opening and the steel needle b beside it, it is no longer in contact with external air pressure, and the liquid trapped in the middle is squeezed out from the lower opening of the syringe. This continues until the first and second piston rods meet, at which point the collected liquid is exhausted, completing one dispensing cycle. The volume of liquid dispensed in one cycle is the cross-sectional area of ​​the syringe multiplied by the length between the upper and lower openings. Then, the first and second piston rods can be moved simultaneously to the left, returning to the starting point below the upper opening of the syringe. This dispensing process can then be repeated.

[0032] In summary, the structure disclosed in this application for transferring and distributing blood from a blood collection tube without opening the cap simply achieves the process of dispensing liquid in a fixed volume without spatial changes. It eliminates the need for instruments such as pipettes and pipette tips, and also eliminates the "removal" step of the blood collection tube, allowing for direct operation. It can dispense small amounts of blood from the blood collection tube in a fixed quantity, which is simple and convenient, and suitable for situations where specific indicators need to be tested on demand.

[0033] It should be noted that the accompanying drawings merely illustrate the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A structure for transferring and distributing blood from a blood collection tube without opening the cap, characterized in that: The syringe includes a syringe (1), a first piston rod (2) and a second piston rod (3). The first piston rod (2) and the second piston rod (3) are coaxially arranged on both sides of the syringe. The pistons of the first piston rod and the second piston rod slide freely left and right inside the syringe. A blood collection tube (4) is connected to the top of the syringe. The connection between the blood collection tube (4) and the syringe (1) is the upper opening (7). A first through hole (101) is provided above the syringe. A steel needle a (5) is provided in the first through hole and leads into the blood collection tube. A second through hole (102) is also provided next to the first through hole above the syringe. A steel needle b (6) is provided in the second through hole and leads to the atmosphere. A third through hole (103) is provided below the syringe and is connected to the lower opening (8).

2. The structure for transferring and distributing blood from a blood collection tube without opening the cap as described in claim 1, characterized in that: The first piston push rod (2) is provided with a first limiting block (9). The first limiting block (9) is located inside the syringe (1). When the first limiting block contacts the syringe, the piston of the first piston push rod is located just below the upper opening (7) of the syringe.

3. The structure for transferring and distributing blood from a blood collection tube without opening the cap as described in claim 1, characterized in that: The second piston push rod (3) is provided with a second limiting block (10). The second limiting block (10) is located outside the syringe (1). When the second limiting block contacts the syringe, the piston of the second piston push rod is located just below the upper opening (7) of the syringe.

4. The structure for transferring and distributing blood from a blood collection tube without opening the cap as described in claim 1, characterized in that: The first piston push rod (2) is provided with a third limiting block (11). The third limiting block (11) is located outside the syringe (1). When the third limiting block contacts the syringe, the piston of the first piston push rod is located above the lower opening (8) of the syringe.

5. The structure for transferring and distributing blood from a blood collection tube without opening the cap according to claim 1, characterized in that: The second piston push rod (3) is provided with a fourth limiting block (12), which is located inside the syringe (1). When the fourth limiting block contacts the syringe, the piston of the second piston push rod is located above the lower opening (8) of the syringe.

6. The structure for transferring and distributing blood from a blood collection tube without opening the cap according to claim 1, characterized in that: The syringe (1) is made of transparent material.

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