Visible flashback blood collection needle

Abstract

Disclosed is a visible flashback blood collection needle, which comprises a needle holder (1) and a needle tube (2) arranged in the needle holder (1) in a penetrating manner. One end of the needle tube (2) penetrates through the needle holder (1) to form a human blood collection end (21), and the other end of the needle tube (2) penetrates through the needle holder (1) to form a puncture end (22). The puncture end (22) is sleeved with a rubber cap (3). The needle holder (1) is transparent, and a mounting cavity (11) extending inwards is formed in the end surface of the needle holder (1) proximal to the puncture end (22). The port of the mounting cavity (11) is equipped with a connecting seat (4). The rubber cap (3) is mounted on the connecting seat (4). A gap (12) enabling the mounting cavity (11) to communicate with the outside is reserved between the needle holder (1) and the connecting seat (4). The mounting cavity (11) is provided with a breathable plug (5). The breathable plug (5) abuts against the connecting seat (4) and divides the mounting cavity (11) into a blood flashback chamber (13). An opening (23) in communication with the blood flashback chamber (13) is formed on the side wall of the needle tube (2). In a successful puncture state, blood flows into the blood flashback chamber (13) from the opening (23), and the ventilation plug (5) is blocked by blood, thereby blocking the blood flashback chamber (13) and enabling blood to be seen from the outside.

Description

Visible blood collection needle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 14, 2023, with application number 202311517926.3, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of medical devices, for example, to a blood collection needle with visible blood return. Background Art

[0003] A hard-wired lancet used in the medical industry consists of a needle holder, a needle tube, a venous needle sheath, and a lancet cover. After removing the venous needle sheath, one end of the needle tube is exposed and used for venipuncture. After removing the lancet cover, the other end of the needle tube is covered with a rubber cap and used to puncture the rubber stopper on a vacuum blood collection tube. The rubber cap covers the needle tip, ensuring its hygiene and sealing. The needle pierces the cap during blood collection.

[0004] Compared to hard-wired lancets, flexible-wired lancets have a transparent connecting hose for easier observation of blood return. However, due to the larger lumen of the connecting hose, it consumes some of the vacuum in the vacuum tube, thus reducing the collection volume. Therefore, in terms of product size and collection volume, hard-wired lancets have a greater advantage.

[0005] However, in a hard-wired blood collection needle, the needle holder of the venous needle is directly connected to the needle holder of the blood collection needle, eliminating the need for a connecting hose. Therefore, blood return cannot be observed, making it impossible to promptly determine the success of the venous puncture during the actual blood collection process. If the puncture is unsuccessful, no blood enters the vacuum blood collection tube, and the puncture angle or depth of the venous needle must be immediately readjusted, increasing the patient's pain. If the puncture is successful but blood is not collected in time, blood is likely to remain in the rubber cap, and there is a risk of blood leaking through the puncture hole in the rubber cap during subsequent blood collection.

[0006] The design of the existing blood collection needle with visible blood return is generally based on the bleeding situation at the end of the blood collection needle, and inevitably there is the problem of blood accumulation in the rubber cap.

[0007] Summary of the Invention

[0008] The present application provides a visible blood return blood collection needle, which realizes the function of clearly observing the blood return, facilitates the timely blood collection operation, avoids blood accumulation in the rubber cap, and reduces the risk of blood leakage.

[0009] The syringe has a cap on its side which is adapted to fit over the needle and to guide the needle out of the way so that the needle can be inserted into the syringe.

[0010] Optionally, a positioning step is provided on the inner wall of the needle seat, and the air-permeable plug is limited by the positioning step and remains located in the middle of the installation cavity.

[0011] Optionally, the vent plug is interference fit with the needle seat and the needle tube respectively.

[0012] Optionally, the connecting seat applies axial pressure to the vent plug, so that the vent plug is tightly attached to the positioning step.

[0013] Optionally, a plurality of axial ridges are evenly distributed on the circumference of the outer surface of the connecting seat, and the plurality of axial ridges are interference fit with the inner wall of the needle seat, and a gap is formed between two adjacent axial ridges.

[0014] Optionally, the connecting seat is provided with a convex edge for clamping the rubber cap.

[0015] Optionally, the connecting seat and the needle tube are clearance-matched.

[0016] Optionally, the needle seat is provided with a first sheath for covering the human blood sampling end, and the first sheath is plugged with a second sheath for covering the puncture end.

[0017] Optionally, a plurality of clamping edges are evenly distributed on the circumference of the outer surface of the needle seat, and the plurality of clamping edges are interference fit with the inner wall of the first sheath.

[0018] Optionally, a stop edge for axially limiting the first sheath is provided on the needle seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is an exploded view of the structure of a blood collection needle with visible blood return provided in an embodiment of the present application;

[0020] FIG2 is a cross-sectional view of a blood collection needle with visible blood flashback provided in an embodiment of the present application;

[0021] FIG3 is a schematic diagram of another structure of a vent plug in a blood collection needle with visible blood return provided in an embodiment of the present application;

[0022] FIG4 is a schematic diagram of the assembly of the vent plug, the connecting seat and the needle seat of FIG3 .

[0023] In the figure: 1. Needle seat; 11. Mounting cavity; 12. Gap; 13. Blood return area; 14. Positioning step; 15. Clamping edge; 16. Stop edge; 2. Needle tube; 21. Human blood collection end; 22. Puncture end; 23. Opening; 3. Rubber cap; 4. Connecting seat; 41. Axial ridge; 42. Raised edge; 5. Vent plug; 6. First sheath; 7. Second sheath. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0025] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, a mechanical connection, an electrical connection, an indirect connection through an intermediate medium, or internal communication between two elements or an interaction between two elements. A person of ordinary skill in the art will be able to understand the meaning of the above terms in this application according to the circumstances.

[0026] In the description of the present application, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below”, and “below” a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature. The technical solution of the present application will be described below with reference to the accompanying drawings and through specific implementation methods.

[0027] Please refer to Figures 1 and 2. This embodiment provides a visible blood return blood collection needle, including a needle seat 1 and a needle tube 2 inserted into the needle seat 1. One end of the needle tube 2 passes through the needle seat 1 to form a human blood collection end 21, and the other end of the needle tube 2 passes through the needle seat 1 to form a puncture end 22. A rubber cap 3 is provided on the puncture end 22. The puncture end 22 pierces the rubber cap 5 and is drawn into the blood collection tube.

[0028] The needle hub 1 is made of transparent material (or at least the blood return area 13 is transparent), and the end face of the needle hub 1 close to the puncture end 22 is provided with an inwardly extending installation cavity 11, the port of the installation cavity 11 is equipped with a connecting seat 4, and the rubber cap 3 is installed on the connecting seat 4. A gap 12 is left between the needle hub 1 and the connecting seat 4 to connect the installation cavity 11 with the outside world. A ventilation plug 5 is provided in the installation cavity 11, which is adjacent to the connecting seat 4 and divides the installation cavity 11 into a blood return area 13. An opening 23 connected to the blood return area 13 is provided on the side wall of the needle tube 2.

[0029] In addition, considering the assembly problem of the vent plug 5, the vent plug 5 can also be designed as a structure that is directly clamped on the connecting seat 4, as shown in Figure 3, and the vent plug 5 is abutted against the inner wall of the installation cavity 11, and the installation cavity 11 is also divided into a blood return area 13 to meet the blood blocking requirements, see Figure 4 for details.

[0030] It should be noted that the material of the vent plug 5 here has pores in the initial state. When encountering blood, the pores of the vent plug 5 are solidified and blocked, or a liquid-expanding structure is adopted, so that the vent plug 5 becomes a sealing plug to prevent blood from leaking out.

[0031] When the puncture is successful, blood flows from the opening 23 into the blood return area 13, and the vent plug 5 is blocked by the blood, thereby blocking the blood return area 13 and allowing the blood to be seen by the outside world, sending a signal to start blood collection.

[0032] A positioning step 14 is provided on the inner wall of the needle seat 1 , and the vent plug 5 is limited by the positioning step 14 and remains located in the middle of the installation cavity 11 , thereby preventing the vent plug 5 from shifting and ensuring structural stability.

[0033] To ensure the subsequent sealing effect of the vent plug 5 , the vent plug 5 is interference fit with the needle seat 1 and the needle tube 2 respectively, and the connecting seat 4 applies axial pressure to the vent plug 5 so that the vent plug 5 is tightly against the positioning step 14 .

[0034] The outer surface of the connector 4 is uniformly distributed with multiple axial ridges 41. These ridges 41 form an interference fit with the inner wall of the needle hub 1, with gaps 12 formed between adjacent ridges 41. The gaps 12 are necessary to initially connect the blood return area 13 to the outside world, allowing blood to flow directly to the blood return area 13 rather than to the puncture end 22.

[0035] The connecting seat 4 is provided with a convex edge 42 for clamping the rubber cap 3 to ensure that the rubber cap 3 is reliably installed.

[0036] The connection seat 4 and the needle tube 2 are in clearance fit, so that after the blood return area 13 is closed, the blood can flow smoothly to the puncture end 22. However, it should be noted that after seeing blood in the blood return area 13, the blood collection operation should be performed immediately to avoid blood accumulation in the rubber cap 3.

[0037] In addition, the needle holder 1 is provided with a first sheath 6 that covers the human blood sampling end 21 , and the first sheath 6 is plugged with a second sheath 7 that covers the puncture end 22 , thereby protecting both ends of the needle tube 2 .

[0038] A plurality of retaining edges 15 are evenly distributed around the circumference of the outer surface of the needle hub 1 , and the retaining edges 15 are interference fit with the inner wall of the first sheath 6 .

[0039] The needle seat 1 is provided with a stop edge 16 for axially limiting the first sheath 6 , thereby ensuring that the first sheath 6 and the second sheath 7 are accurately assembled and installed.

[0040] In summary, the above-mentioned visible blood return blood collection needle has an opening in the middle of the needle tube and a vent plug is provided at the opening to connect the inner cavity of the needle tube with the outside world. When the puncture is successful, blood overflows from the opening at the first time, and the vent plug is blocked by blood, which neither causes blood leakage nor makes the blood visible, indicating that blood can be collected. It changes the existing way of returning blood from the rubber cap, thereby solving the problem of blood storage in the rubber cap.

Claims

1. A visible blood-return blood collection needle, comprising a needle seat (1) and a needle tube (2) inserted into the needle seat (1), one end of the needle tube (2) passes through the needle seat (1) to form a human blood collection end (21), and the other end of the needle tube (2) passes through the needle seat (1) to form a puncture end (22), and a rubber cap (3) is provided on the puncture end (22), wherein: The needle seat (1) is transparent, and an inwardly extending installation cavity (11) is provided on the end surface of the needle seat (1) close to the puncture end (22). The port of the installation cavity (11) is equipped with a connecting seat (4). The rubber cap (3) is installed on the connecting seat (4). A gap (12) is left between the needle seat (1) and the connecting seat (4) to connect the installation cavity (11) with the outside. A vent plug (5) is provided in the installation cavity (11). The vent plug (5) is adjacent to the connecting seat (4) and divides the installation cavity (11) into a blood return area (13). An opening (23) connected to the blood return area (13) is provided on the side wall of the needle tube (2). When the puncture is successful, blood flows from the opening (23) into the blood return area (13). The vent plug (5) is blocked by blood, thereby blocking the blood return area (13) and allowing the blood to be seen by the outside.

2. The visible blood return blood collection needle according to claim 1, wherein: A positioning step (14) is provided on the inner wall of the needle seat (1), and the vent plug (5) is limited by the positioning step (14) and maintained in the middle of the installation cavity (11).

3. The visible blood return blood collection needle according to claim 2, wherein: The vent plug (5) is interference fit with the needle seat (1) and the needle tube (2) respectively.

4. The visible blood return blood collection needle according to claim 2, wherein: The connecting seat (4) applies axial pressure to the vent plug (5), thereby causing the vent plug (5) to be in close contact with the positioning step (14).

5. The visible blood return blood collection needle according to claim 1, wherein: The outer surface of the connecting seat (4) is evenly distributed with a plurality of axial ridges (41) on its circumference. The plurality of axial ridges (41) are interference-fitted with the inner wall of the needle seat (1), and the gap (12) is formed between two adjacent axial ridges (41).

6. The visible blood return blood collection needle according to claim 1, wherein: The connecting seat (4) is provided with a convex edge (42) for clamping the rubber cap (3).

7. The visible blood flashback blood collection needle according to claim 1, wherein: The connecting seat (4) and the needle tube (2) are clearance-matched.

8. The visible blood flashback blood collection needle according to claim 1, wherein: The needle seat (1) is provided with a first sheath (6) for covering the human body blood sampling end (21), and the first sheath (6) is plugged with a second sheath (7) for covering the puncture end (22).

9. The visible blood flashback blood collection needle according to claim 8, wherein: A plurality of retaining edges (15) are evenly distributed on the circumference of the outer surface of the needle seat (1), and the plurality of retaining edges (15) are interference-fitted with the inner wall of the first sheath (6).

10. The visible blood flashback blood collection needle according to claim 8, wherein: The needle seat (1) is provided with a stop edge (16) for axially limiting the first sheath (6).

Images