Retractable blood taking needle
By designing a retractable blood collection needle, a locking ring and locking structure are used to automatically retract the needle tip into the outer shell, solving the problem of the needle tip being exposed after use and improving safety and convenience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHINVA ANDE HEALTHCARE APP CO LTD
- Filing Date
- 2025-01-06
- Publication Date
- 2026-05-15
AI Technical Summary
Existing blood collection needles pose a safety hazard due to exposed needle tips after use, which may lead to puncture wounds and cross-infection. Furthermore, there is a safety risk of improper handling during the retrieval process.
Design a retractable blood collection needle that retracts the needle hub and needle tip into the outer shell by sliding a locking ring, and uses a locking structure and an anti-dislodgement structure to lock the needle tip inside the outer shell to prevent the needle tip from being exposed.
It effectively prevents needle stick injuries and cross-infection, and ensures that the needle tip does not protrude after use, thus improving safety and ease of operation.
Smart Images
Figure CN224235413U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a retractable blood collection needle, belonging to the field of blood collection needle technology. Background Technology
[0002] Blood collection needles, as medical tools for collecting blood samples, may carry pathogens after use, and their sharp tips are also dangerous. Therefore, after blood collection, they are collected as hazardous medical waste in special sharps containers and then handed over to a medical waste disposal center for harmless treatment. However, in the actual collection and subsequent processing, there is still a possibility of personnel being pricked, causing cross-infection. In addition, some medical institutions have improper operating procedures during the collection of blood collection needles, resulting in the exposure of discarded needles, posing a serious safety hazard. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a retractable blood collection needle that can retract the needle into the outer shell to prevent the needle from being exposed, thereby eliminating safety hazards such as needle stick injuries and cross-infection.
[0004] The retractable blood collection needle of this utility model includes a needle tip, a protective cap, a needle hub, and a flexible tube. It also includes a housing. The rear of the needle hub is installed inside the housing and connected to the flexible tube. The other end of the flexible tube extends from the rear of the housing. The front of the needle hub extends from the top of the housing and is fitted with the needle tip. At least two spring slots are provided at the front of the housing, and a limiting spring is formed in each spring slot. A guide boss is provided on the inner side of the movable end of the limiting spring. A locking ring is fitted around the outer periphery of the housing corresponding to the limiting spring. External force can push the locking ring to move back and forth along the housing. The locking ring can lock the limiting spring in the spring slot and limit the needle hub through the guide boss. After the locking ring disengages from the limiting spring, the needle hub can move backward (applying a backward force to the needle hub pushes the guide boss, causing the guide boss to cause the movable end of the limiting spring to expand outward, thus eliminating the limiting effect). The housing has a locking structure that can lock the needle tip inside the housing. The rear of the housing has an anti-dislodgement structure to prevent the needle hub from detaching from the housing.
[0005] In the initial state, the locking ring is located outside the limiting spring, locking the limiting spring in the spring groove. The guide protrusion on the inner side of the moving end of the limiting spring abuts against the lower end of the needle hub, preventing the needle hub from moving downward and ensuring that the needle hub and needle do not shift during blood collection. After the blood collection operation is completed, slide the locking ring to disengage it from the limiting spring. Then, use external force (such as pulling the tubing backward) to retract the needle hub and needle until the needle is completely retracted into the housing. The locking structure locks the position of the needle hub, and the anti-dislodgement structure prevents the needle hub from coming out of the rear of the housing. Finally, the needle hub and needle are locked inside the housing, achieving the purpose of preventing needle exposure and eliminating safety hazards such as needle stick injuries and cross-infection.
[0006] The locking structure described in this utility model is mainly used to position the needle holder. It has many structural forms. It can be a downward-opening spring piece designed on the inner wall of the rear part of the shell. When the needle holder moves backward to the position of the spring piece, it squeezes the spring piece and continues to move backward until it passes the spring piece. Then the squeezing force acting on the spring piece disappears and the spring piece resets, locking the position of the needle holder behind the spring piece. Other structural forms can also be used.
[0007] The locking structure in this utility model adopts the following preferred embodiment:
[0008] The locking structure includes a compression spring. A mounting ring is formed on the outer periphery of the needle holder at the rear of the needle seat, with the rear end of the needle seat serving as a spring seat. The compression spring is fitted onto the mounting ring. The upper end of the mounting ring abuts against the inner top of the outer casing. When the locking ring disengages from the limiting spring, the external force applied to the guide boss disappears. The compression spring, under its own elastic force, automatically pushes the needle holder backward, causing the needle to retract into the outer casing. The elastic force of the compression spring is continuously applied to the needle holder, thus locking the needle inside the outer casing. This locking structure allows the needle holder to be automatically pushed backward by the compression spring's own elastic force, eliminating the need for manual pulling of the tubing and making operation more convenient.
[0009] Preferably, a groove is formed on the outer periphery of the spring seat corresponding to the guide boss; when the locking ring locks the limiting spring in the spring slot, the guide boss is located in the groove, thereby limiting the needle seat. More preferably, the groove is an annular groove formed on the circumference of the spring seat.
[0010] Preferably, when the needle seat moves backward, it contacts the guide boss, and at least one of the contact surfaces is a guide slope, so that when the needle seat moves backward, it can push the guide boss and the movable end of the limiting spring to open outward.
[0011] Preferably, the slots of each spring are evenly distributed on the outer shell, so that the needle seat is subjected to uniform force, which is more stable, especially when the needle seat retracts into the outer shell.
[0012] Preferably, the anti-detachment structure is a cap installed at the rear end of the outer casing. The cap and the rear end of the outer casing can be connected as one piece by threads or assembled as one piece by interference fit.
[0013] Preferably, the outer periphery of the locking ring has an anti-slip structure for easy operation. The anti-slip structure can take various forms, such as a raised ring, anti-slip groove, anti-slip dot, or anti-slip texture.
[0014] The advantages of this utility model compared with the prior art are:
[0015] This utility model has a clever and reasonable structural design. It uses a sliding locking ring to disengage the needle from the limiting spring, and then uses external force to drive the needle seat and needle to retract until the needle is completely retracted into the shell. The locking structure locks the position of the needle seat, and the anti-dislodgement structure prevents the needle seat from coming out of the rear of the shell. Finally, the needle seat and needle are locked inside the shell, which can prevent the needle from being exposed and eliminate safety hazards such as needle puncture and cross-infection. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 in its initial state;
[0017] Figure 2 yes Figure 1 AA cross-section view;
[0018] Figure 3 This is a schematic diagram of the needle holder structure in Embodiment 1;
[0019] Figure 4 This is a schematic diagram of the outer shell structure in Embodiment 1;
[0020] Figure 5 yes Figure 4 BB cross-section;
[0021] Figure 6 This is a schematic diagram of the structure of Embodiment 2 in its initial state;
[0022] Figure 7 This is a schematic diagram of the needle holder structure in Example 2.
[0023] In the diagram: 1. Protective cap; 2. Outer shell; 3. Spring slot; 4. Locking ring; 5. Protruding ring; 6. Limiting spring; 7. Cap; 8. Hose; 9. Guide boss; 10. Needle seat; 11. Compression spring; 12. Assembly ring; 13. Spring seat; 14. Slot; 15. Needle. Detailed Implementation
[0024] The embodiments of this utility model will be further described below with reference to the accompanying drawings:
[0025] Example 1:
[0026] like Figure 1-5As shown, the retractable blood collection needle in this embodiment includes a needle tip 15, a protective cap 1, a needle seat 10, a tubing 8, and a housing 2. The rear of the needle seat 10 is installed inside the housing 2 and connected to the tubing 8. The other end of the tubing 8 extends out from the rear of the housing 2. The front of the needle seat 10 extends out from the top of the housing 2 and is fitted with the needle tip 15. Two spring slots 3 are formed at the front of the housing 2, and a limiting spring 6 is formed in each spring slot 3. A guide protrusion 9 is provided on the inner side of the movable end of the limiting spring 6. A locking ring 4 is fitted around the outer periphery of the housing 2 corresponding to the limiting spring 6, which can be locked by external force. Ring 4 moves back and forth along the outer shell 2; locking ring 4 can lock the limiting spring 6 in the spring groove 3 and limit the needle seat 10 through the guide boss 9; after locking ring 4 disengages from limiting spring 6, needle seat 10 can move backward (applying a backward force to needle seat 10, which pushes guide boss 9, causing guide boss 9 to drive the movable end of limiting spring 6 to open outward, and the limiting effect is eliminated); the outer shell 2 is provided with a locking structure that can lock the needle 15 inside the outer shell 2; the rear of the outer shell 2 is provided with an anti-dislodgement structure to prevent needle seat 10 from coming out of the outer shell 2.
[0027] The locking structure in this embodiment includes a compression spring 11, and an assembly ring 12 is opened on the outer periphery of the rear part of the needle seat 10 corresponding to the compression spring 11. The rear end of the needle seat 10 becomes a spring seat 13, and the compression spring 11 is fitted on the assembly ring 12. The upper end of the assembly ring 12 abuts against the inner top of the outer shell 2.
[0028] The usage process of the retractable blood collection needle described in this embodiment is as follows:
[0029] In the initial state, the locking ring 4 is located outside the limiting spring 6, locking the limiting spring 6 in the spring groove 3. The guide boss 9 on the inner side of the movable end of the limiting spring 6 abuts against the lower end of the needle seat 10, preventing the needle seat 10 from moving downward. Blood collection is performed in this state, and the needle seat 10 and the needle 15 will not be displaced during the blood collection process. After the blood collection operation is completed, the locking ring 4 is slid upward to disengage the locking ring 4 from the limiting spring 6. At this time, the external force applied to the guide boss 9 disappears, and the compression spring 11 automatically pushes the needle seat 10 backward under its own elastic force, and drives the needle 15 to completely retract into the outer shell 2. Moreover, the elastic force of the compression spring 11 will always be applied to the needle seat 10, thereby locking the needle 15 inside the outer shell 2. The needle holder 10 is locked in position by a locking structure, and the needle holder 10 is prevented from coming out of the rear of the outer shell 2 by an anti-dislodgement structure. In the end, the needle holder 10 and the needle 15 are locked inside the outer shell 2, which achieves the purpose of preventing the needle 15 from being exposed and eliminates safety hazards such as needle puncture and cross-infection.
[0030] In this embodiment:
[0031] When the needle seat 10 moves backward, it contacts the guide boss 9. At least one of the contact surfaces of the two is a guide slope. In this embodiment, the contact surfaces of the rear end of the needle seat 10 and the guide boss 9 are both guide slopes. When the needle seat 10 moves backward, it can easily push the guide boss 9 and the movable end of the limiting spring 6 outward.
[0032] Each spring slot 3 is evenly distributed on the outer shell 2, so that the needle seat 10 is subjected to uniform force, especially when the needle seat 10 retracts into the outer shell 2, it is more stable.
[0033] The anti-detachment structure is a cap 7 installed at the rear end of the outer shell 2. The cap 7 and the rear end of the outer shell 2 are assembled together by interference fit.
[0034] The outer periphery of the locking ring 4 has an anti-slip structure, which is a raised ring 5.
[0035] Example 2:
[0036] like Figure 6-7 As shown, the structure of the retractable blood collection needle in this embodiment is basically the same as that in Embodiment 1, except for the structure of the needle holder 10: In this embodiment, a slot 14 is formed on the outer periphery of the spring seat 13 at the rear of the needle holder 10, corresponding to the guide boss 9. The slot 14 is an annular groove formed on the circumference of the spring seat 13. When the locking ring 4 locks the limiting spring 6 in the spring slot 3, the guide boss 9 is located in the slot 14, thereby limiting the needle holder 10. The usage process of the retractable blood collection needle in this embodiment is also the same as that in Embodiment 1, and will not be described again here.
Claims
1. A retractable blood collection needle, comprising a needle tip (15), a protective cap (1), a needle hub (10), and a flexible tube (8), characterized in that: The device is equipped with a housing (2), the rear of the needle holder (10) is installed inside the housing (2) and connected to a hose (8), the other end of the hose (8) extends out from the rear of the housing (2), and the front end of the needle holder (10) extends out from the top of the housing (2) and is fitted with a needle (15); The front part of the outer shell (2) has at least two spring slots (3) and a limiting spring (6) is formed in each spring slot (3). The inner side of the movable end of the limiting spring (6) is provided with a guide boss (9). A locking ring (4) is fitted around the outer periphery of the outer shell (2) corresponding to the limiting spring (6). The locking ring (4) can be pushed to move back and forth along the outer shell (2) by external force. The locking ring (4) can lock the limiting spring (6) in the spring groove (3) and limit the needle seat (10) through the guide boss (9). After the locking ring (4) is separated from the limiting spring (6), the needle seat (10) can move backward. The housing (2) is provided with a locking structure that can lock the needle (15) inside the housing (2); The rear of the outer casing (2) is provided with an anti-detachment structure to prevent the needle seat (10) from detaching from the outer casing (2).
2. The retractable blood collection needle according to claim 1, characterized in that: The locking structure includes a compression spring (11), and an assembly ring (12) is opened on the outer periphery of the rear part of the needle seat (10) corresponding to the compression spring (11). The rear end of the needle seat (10) becomes a spring seat (13), and the compression spring (11) is fitted on the assembly ring (12). The upper end of the assembly ring (12) abuts against the inner top of the outer shell (2).
3. The retractable blood collection needle according to claim 1 or 2, characterized in that: The corresponding guide boss (9) has a slot (14) on the outer periphery of the spring seat (13); when the locking ring (4) locks the limiting spring (6) in the spring slot (3), the guide boss (9) is located in the slot (14) to limit the needle seat (10).
4. The retractable blood collection needle according to claim 3, characterized in that: The slot (14) is an annular groove formed on the circumference of the spring seat (13).
5. The retractable blood collection needle according to claim 1, characterized in that: When the needle seat (10) moves backward, it contacts the guide boss (9), and at least one of the contact surfaces is a guide slope.
6. The retractable blood collection needle according to claim 1, characterized in that: Each spring slot (3) is evenly distributed on the outer shell (2).
7. The retractable blood collection needle according to claim 1, 2, 5 or 6, characterized in that: The anti-detachment structure is a cap (7) installed at the rear end of the outer shell (2).
8. The retractable blood collection needle according to claim 7, characterized in that: The cap (7) and the rear end of the outer shell (2) are connected by threads or assembled as one unit by interference fit.
9. The retractable blood collection needle according to claim 1, 2, 5 or 6, characterized in that: The outer periphery of the locking ring (4) has an anti-slip structure.
10. The retractable blood collection needle according to claim 9, characterized in that: The anti-slip structure is a raised ring (5), an anti-slip groove, an anti-slip protrusion, or an anti-slip texture.