Safe blood taking needle

Abstract

The utility model relates to the technical field of medical instruments, in particular to a safety type blood taking needle which comprises a needle head, a needle rod, a needle tube, a sleeve, a spring, a piston, a limiting plate and a buckle, the two ends of the needle rod are fixedly communicated with the needle head and the needle tube respectively, and the needle rod is arranged on the inner side of the sleeve in a sliding mode in the axis direction of the sleeve. A piston is coaxially fixed to the outer side of the end, close to the needle head, of the needle rod, the piston and the inner wall of the sleeve are dynamically sealed, a spring is arranged between the end, close to the needle head, of the inner side of the sleeve and the piston in a compressed mode, and a limiting plate is fixedly installed in the middle of the inner side of the sleeve. The side face of the end, away from the needle head, of the needle rod is dynamically sealed with the inner side wall of the through hole, at least one air hole is formed in the surface of the limiting plate, and a buckle is fixedly arranged at the end, away from the needle head, of the needle rod and selectively limited and fixed to the tail end, away from the needle head, of the sleeve. The needle retraction speed can be adjusted, and the feeling of medical staff can be improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a safe blood collection needle. Background Technology

[0002] With the development of medical technology, safety blood collection needles, as a widely used medical device in the blood collection process, have been widely adopted in various hospitals and clinics because they can effectively avoid needlestick injuries and improve the safety of medical staff and patients. Retractable blood collection needles typically consist of a needle tube, a needle tip, and a retraction mechanism. Their basic working principle is that after blood collection, the retraction device automatically and safely retrieves the needle tip, avoiding needle exposure and thus reducing the risk of cross-infection.

[0003] Existing retractable lancets include those that retract manually and those that retract using pneumatic pressure or a spring. Manual retraction is relatively difficult, while pneumatic or spring-driven retraction has a fixed and unadjustable speed, often resulting in retraction that is too fast or too slow. Too fast a retraction speed may cause pain or discomfort to the patient after blood collection, and may even lead to skin damage; while too slow a retraction speed prolongs the blood collection process, affecting the doctor's efficiency. Furthermore, the impact during retraction can cause the lancet to recoil, increasing patient discomfort, especially in children or elderly patients.

[0004] Therefore, how to optimize the retraction speed and reduce the patient's pain while ensuring blood collection efficiency has become an urgent problem to be solved. Utility Model Content

[0005] In view of this, this utility model proposes a safer blood collection needle with a more reasonable structural design, which aims to reduce the speed of needle retraction and thus reduce skin damage to the person receiving the needle.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a safe blood collection needle, including: a needle tip, a needle rod, a needle tube, a sleeve, a spring, a piston, a limiting plate, and a buckle. The two ends of the needle rod are respectively fixedly connected to the needle tip and the needle tube. The needle rod is slidably disposed inside the sleeve along the axial direction. A piston is coaxially fixed to the outer side of the end of the needle rod near the needle tip. The piston and the inner wall of the sleeve are dynamically sealed. The spring is compressed and disposed between the end of the sleeve near the needle tip and the piston. The limiting plate is fixedly installed in the middle of the inner side of the sleeve. A through hole is opened in the middle of the limiting plate. The side of the needle rod located at the end of the piston away from the needle tip is dynamically sealed with the inner wall of the through hole. At least one vent hole is opened on the surface of the limiting plate. A buckle is also fixedly disposed at the end of the needle rod away from the needle tip. The buckle can be selectively limited and fixed to the end of the sleeve away from the needle tip.

[0007] In the above embodiments, the needle, needle shaft, and needle tube are all hollow tubular structures. After the needle is inserted into the blood vessel, the blood flows through the needle, needle shaft, and needle tube in sequence. The blood flowing out of the needle tube eventually enters the blood collection container through a catheter.

[0008] In some embodiments, a connecting block is also included, which is fixedly connected between the needle bar and the needle tube. The buckle is installed on the side of the connecting block away from the needle bar, and the connecting block and the sleeve are slidably engaged at the opening at the end away from the needle tip.

[0009] In some embodiments, a check block is also included, which is fixedly installed on the side of the connecting block near the needle bar. The check block can be selectively slid to the inside of the opening at the end of the sleeve away from the needle tip and engage with the opening of the sleeve.

[0010] In some implementations, when the check valve is engaged and fixed with the sleeve opening, the tip of the needle is located inside the sleeve.

[0011] In some embodiments, an adjusting paddle is also included. The adjusting paddle is coaxially rotatably mounted on the side of the limiting plate away from the piston. The surface of the adjusting paddle has a vent window. During the rotation of the adjusting paddle, the cross-sectional area of ​​the vent window and the vent hole can be changed.

[0012] In some embodiments, the number of vent holes is at least two, and the multiple vent holes are distributed at intervals along the circumference of the limiting plate.

[0013] In some embodiments, the outer surface of the sleeve is provided with an adjustment window along the circumference, and at least a portion of the adjustment lever is embedded in the adjustment window and can slide within the adjustment window.

[0014] In some embodiments, a handle is also included, which is fixedly disposed on the side of the sleeve.

[0015] The present invention has the following advantages over the prior art:

[0016] The safety blood collection needle provided by this utility model uses a spring to drive the needle to retract while utilizing the sealing effect of the sealed cavity formed between the piston and the limiting plate, along with the vent hole for slow pressure relief. This avoids skin traction or tearing caused by the needle being quickly pulled out of the patient's body surface due to the rapid rebound of the spring, greatly reducing the patient's pain. At the same time, the slow rebound method also reduces the operational difficulty for medical staff administering the needle. The needle can be pulled out by releasing the buckle. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an isometric view of the safety blood collection needle of this utility model;

[0019] Figure 2 This is an isometric half-sectional view of the safety blood collection needle of this utility model;

[0020] Figure 3 This is a cross-sectional view of the retracted state of the safety blood collection needle of this utility model;

[0021] Figure 4 This is an isometric view of the sleeve portion of the safety blood collection needle of this utility model;

[0022] Figure 5 This is an isometric view of the adjusting lever portion of the safety blood collection needle of this utility model.

[0023] In the diagram: 1-Needle, 2-Needle bar, 3-Needle tube, 4-Sleeve, 5-Spring, 6-Piston, 7-Limiting plate, 8-Snap fastener, 9-Connecting block, 10-Check block, 11-Adjusting lever, 12-Handle, 71-Ventilation hole, 41-Adjusting window, 111-Ventilation window. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] like Figure 1 As shown, combined with Figure 2-5 The present invention relates to a safety blood collection needle, comprising: a needle tip 1, a needle rod 2, a needle tube 3, a sleeve 4, a spring 5, a piston 6, a limiting plate 7, and a buckle 8. The two ends of the needle rod 2 are respectively fixedly connected to the needle tip 1 and the needle tube 3. The needle rod 2 is slidably disposed inside the sleeve 4 along the axial direction. The piston 6 is coaxially fixed to the outer side of the end of the needle rod 2 near the needle tip 1. The piston 6 is dynamically sealed to the inner wall of the sleeve 4. The spring 5 is coaxially compressed between the end of the sleeve 4 near the needle tip 1 and the piston 6. The limiting plate 7 is fixedly installed in the middle of the inner side of the sleeve 4. A through hole is opened in the middle of the limiting plate 7. The side of the needle rod 2 located at the end of the piston 6 away from the needle tip 1 is dynamically sealed to the inner wall of the through hole. At least one vent hole 71 is opened on the surface of the limiting plate 7. A buckle 8 is also fixedly disposed at the end of the needle rod 2 away from the needle tip 1. The buckle 8 can be selectively fixed to the end of the sleeve 4 away from the needle tip 1.

[0029] In the above embodiments, the sleeve 4 is a cylindrical structure with openings at both ends. The two ends converge inwards to form certain limiting structures, used to limit the needle 1 and the latch 8, respectively. When the latch 8 engages with the opening at the end of the sleeve 4, the piston 6 approaches the inner side of the opening near the needle 1. At this time, the spring 5 is compressed. When blood collection is complete and the needle needs to be removed, the latch 8 is manually released, and the spring 5 is released. Because a relatively sealed cavity is formed between the piston 6, the limiting plate 7, the needle rod 2, and the inner wall of the sleeve 4, the spring 5 is still subjected to the reaction force of the piston 6 under air pressure. Therefore, the spring 5 cannot immediately extend. At this time, the gas in the relatively sealed cavity is released through the vent 71 under pressure, causing the piston 6 to gradually release as the amount of gas in the cavity decreases, ultimately achieving the purpose of slowly retracting the needle. When the spring 5 is fully extended, the needle 1 can be retracted into the sleeve 4, thus preventing the needle from causing harm to other personnel and improving safety.

[0030] In some embodiments, a connecting block 9 is also included, which is fixedly connected between the needle bar 2 and the needle tube 3. The buckle 8 is installed on the side of the connecting block 9 away from the needle bar 2, and the connecting block 9 and the sleeve 4 are slidably engaged with the opening at the end away from the needle tip 1.

[0031] In the above embodiments, the connecting block 9 serves two purposes: firstly, it supports the buckle 8; secondly, it limits the rotation angle of the needle bar connected to it. When the opening shape of the sleeve 4 near the connecting block 9 is similar to the cross-sectional shape of the connecting block 9, the rotation angle can be limited. The buckle includes at least one elastic piece. The elastic piece can move elastically along the radial direction of the sleeve 4. The surface of the elastic piece is provided with a groove for engaging with the constricted edge of the opening of the sleeve 4. When the elastic piece moves elastically inward, the groove disengages from the constricted edge of the opening of the sleeve 4, thereby allowing the spring 5 to release its elastic force and extend.

[0032] In some embodiments, a check block 10 is also included. The check block 10 is fixedly installed on one side of the connecting block 9 near the needle bar 2. The check block 10 can be selectively slid to the inside of the opening of the sleeve 4 away from the needle 1 and engage with the opening of the sleeve 4.

[0033] In the above embodiments, the check block 10 is used to engage and fix the needle 1 with the opening and closing edge of the sleeve 4 after the needle 1 retracts, thereby preventing the needle 1 from extending out of the outside of the sleeve 4 again. The check block 10 also includes at least one elastic piece. During the retraction of the needle 1, the elastic piece first moves inward along the radial direction of the sleeve 4 and then pops out. After popping out, the elastic piece abuts against the outer surface of the opening and closing edge of the sleeve 4, thereby preventing the needle 1 from extending out again. It should be understood that the check block 10 also includes a clamping stop, which is used to engage with the elastic piece of the check block 10 to clamp and fix the opening and closing edge of the sleeve 4.

[0034] In some embodiments, when the check block 10 is engaged and fixed with the opening of the sleeve 4, the end of the needle 1 is located inside the sleeve 4.

[0035] In the above embodiments, the size of the needle 1 is designed such that when the check block 10 is engaged and fixed with the opening and closing edge of the sleeve 4, the needle 1 is located inside the sleeve 4. This allows the needle 1 to completely avoid contact with the outside world after it is retracted, thereby avoiding harm to medical personnel.

[0036] In some embodiments, an adjusting lever 11 is also included. The adjusting lever 11 is coaxially rotatably mounted on the side of the limiting plate 7 away from the piston 6. A ventilation window 111 is provided on the surface of the adjusting lever 11. During the rotation of the adjusting lever 11, the cross-sectional area of ​​the ventilation window 111 communicating with the ventilation hole 71 can be changed.

[0037] In the above embodiments, in order to adapt to the different rebound speed requirements of the needle 1, a rotatable adjustment lever 11 is provided on the side of the limiting plate 7 away from the piston 6. The adjustment lever can be adjusted by manual rotation. During the rotation, the cross-sectional area of ​​the connection between the vent window 111 and the vent hole 71 can be changed, thereby changing the air output. The change in air output will change the movement speed of the piston 6, thereby realizing the adjustment of different rebound speeds.

[0038] In some embodiments, the number of vent holes 71 is at least two, and the plurality of vent holes 71 are distributed at intervals along the circumference of the limiting plate 7.

[0039] In the above embodiments, multiple vent holes 71 can work with vent windows 111 to achieve different speed adjustments, which is beneficial to improving adjustment accuracy.

[0040] In some embodiments, an adjustment window 41 is provided on the outer surface of the sleeve 4 in the circumferential direction, and at least a portion of the adjustment lever 11 is embedded in the adjustment window 41 and can slide within the adjustment window 41.

[0041] In the above embodiments, the adjustment window 41 provides a convenient channel for manual access to the adjustment lever 11, thereby enabling manual adjustment from the outside of the sleeve 4.

[0042] In some embodiments, a handle 12 is also included, which is fixedly disposed on the side of the sleeve 4.

[0043] In the above embodiments, the handle 12 is used to push and pull the sleeve 4, thereby facilitating the needle insertion or removal operation, and also facilitating the fixing of the angle and position of the sleeve 4.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A safety blood collection needle, characterized in that, include: The device consists of a needle (1), a needle bar (2), a needle tube (3), a sleeve (4), a spring (5), a piston (6), a limiting plate (7), and a buckle (8). The two ends of the needle bar (2) are fixedly connected to the needle (1) and the needle tube (3), respectively. The needle bar (2) is slidably disposed inside the sleeve (4) along the axial direction of the sleeve (4). A piston (6) is coaxially fixed to the outer side of the end of the needle bar (2) near the needle (1). The piston (6) is dynamically sealed to the inner wall of the sleeve (4). The spring (5) is compressed and disposed inside the sleeve (4) near the needle (1). Between the end near the needle (1) and the piston (6), a limiting plate (7) is fixedly installed in the middle of the inner side of the sleeve (4). A through hole is opened in the middle of the limiting plate (7). The side of the needle rod (2) located at the end of the piston (6) away from the needle (1) is dynamically sealed with the inner wall of the through hole. At least one vent hole (71) is opened on the surface of the limiting plate (7). A buckle (8) is also fixedly provided at the end of the needle rod (2) away from the needle (1). The buckle (8) can be selectively limited and fixed at the end of the sleeve (4) away from the needle (1).

2. The safety blood collection needle as described in claim 1, characterized in that, It also includes a connecting block (9), which is fixedly connected between the needle bar (2) and the needle tube (3). The buckle (8) is installed on the side of the connecting block (9) away from the needle bar (2). The connecting block (9) and the sleeve (4) are slidably engaged at the end away from the needle tip (1).

3. The safety blood collection needle as described in claim 2, characterized in that, It also includes a check block (10), which is fixedly installed on the side of the connecting block (9) near the needle bar (2). The check block (10) can be selectively slid to the inside of the opening of the sleeve (4) away from the needle (1) and engage with the opening of the sleeve (4).

4. The safety blood collection needle as described in claim 3, characterized in that, When the check block (10) is engaged and fixed with the opening of the sleeve (4), the end of the needle (1) is located inside the sleeve (4).

5. The safety blood collection needle as described in claim 1, characterized in that, It also includes an adjustment lever (11), which is coaxially mounted on the side of the limiting plate (7) away from the piston (6). The surface of the adjustment lever (11) is provided with a ventilation window (111). During the rotation of the adjustment lever (11), the cross-sectional area of ​​the ventilation window (111) and the ventilation hole (71) can be changed.

6. The safety blood collection needle as described in claim 5, characterized in that, The number of vents (71) is at least 2, and the multiple vents (71) are distributed at intervals along the circumference of the limiting plate (7).

7. The safety blood collection needle as described in claim 5, characterized in that, An adjustment window (41) is provided on the outer surface of the sleeve (4) in the circumferential direction. At least a part of the adjustment lever (11) is embedded in the adjustment window (41) and can slide in the adjustment window (41).

8. The safety blood collection needle as described in claim 1, characterized in that, It also includes a handle (12), which is fixedly mounted on the side of the sleeve (4).

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