Safety vein blood taking needle

Abstract

The invention relates to a safety vein blood taking needle which comprises a needle base, a puncture needle, a catheter, a blood taking needle, a sleeve, a pressing assembly, a spring, a limiting ring, a clamping head and a needle wing. The front end of the needle seat is provided with a puncture needle, and the rear end is connected with a blood taking needle through a catheter; the needle base is arranged in the sleeve, the pressing assembly is arranged on the sleeve in a penetrating mode, a protrusion is arranged on the inner wall of the sleeve, and the spring, the limiting ring and the clamping head are sequentially arranged on the outer side of the needle base from front to back. The spring sleeves the needle seat, one end of the spring abuts against the sleeve, the other end of the spring abuts against a limiting ring fixed to the outer side of the needle seat, one end of the clamping head is connected to the outer side of the needle seat, the other end of the clamping head is a free end, the front side and the rear side of the free end abut against the limiting ring and a protrusion on the inner wall of the sleeve respectively, and the free end can be separated from the protrusion on the inner wall of the sleeve under the action of the pressing assembly; and the needle wing is connected to the outer side of the needle seat and can slide back and forth along the sleeve. Compared with the prior art, the puncture needle has the advantages of being high in safety, capable of achieving puncture needle retraction through pressing, convenient to operate and the like.

Description

Technical Field

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

[0002] Venous blood collection is a common method of blood sampling, usually performed using a venous collection needle. A venous collection needle consists of a puncture needle, a catheter, and a collection needle connected in sequence. During use, a vein is punctured through the puncture needle. After successful puncture, the collection needle is inserted into a vacuum blood collection tube. Under negative pressure, blood is drawn into the blood collection tube through the puncture needle, catheter, and collection needle. After blood collection, the puncture needle is removed, and local hemostasis is achieved. However, after removal, the puncture needle is exposed to air, which can easily cause needlestick injuries and even serious consequences such as infection of healthcare workers.

[0003] Patent CN215227683 U discloses a disposable retractable anti-needle-puncture venous blood collection needle, comprising: a needle hub, a cannula, and a blood collection needle hub. A puncture needle is positioned at the front end of the needle hub, and needle wings are provided on the needle hub. The cannula is fitted onto the needle hub and has a strip-shaped hole. The needle wings are slidably disposed within the strip-shaped hole. A locking head is positioned at the front end of the needle hub, and a spring is fitted at the front end of the needle hub. The spring is located at the front end of the locking head. A through hole is provided on the cannula, and a pin is placed within the through hole to lock the locking head. This venous blood collection needle, by incorporating a spring and locking head on the needle hub, allows the locking head to move after blood collection by removing the pin. The spring's restoring force then retracts the puncture needle back into the cannula, reducing the possibility of needle puncture. However, this venous blood collection needle requires the removal of the pin to retract the puncture needle, which is inconvenient for medical personnel and poses a certain risk of it falling out. Summary of the Invention

[0004] The purpose of this invention is to provide a safe venous blood collection needle that can be retracted by pressing, thereby improving the ease of operation.

[0005] The objective of this invention can be achieved through the following technical solution: a safety-type venous blood collection needle, comprising a needle hub, a puncture needle, a catheter, a blood collection needle, a cannula, a pressing assembly, a spring, a limiting ring, a locking head, and needle wings;

[0006] The needle hub has a puncture needle at the front end and a blood collection needle at the rear end via a catheter.

[0007] The needle seat is located inside the sleeve, and a pressing component is passed through the sleeve. The inner wall of the sleeve has a protrusion, and the spring, the limiting ring and the locking head are arranged sequentially from front to back on the outer side of the needle seat.

[0008] The spring is sleeved on the outside of the needle seat, with one end abutting against the sleeve and the other end abutting against the limiting ring fixed on the outside of the needle seat. One end of the clamp is connected to the outside of the needle seat, and the other end is a free end. The front and rear sides of the free end abut against the limiting ring and the protrusion on the inner wall of the sleeve, respectively. The free end can disengage from the protrusion on the inner wall of the sleeve under the action of the pressing component.

[0009] The needle wing is connected to the outside of the needle hub and can slide back and forth along the sleeve.

[0010] Preferably, the spring is compressed when the front and rear sides of the free end abut against the limiting ring and the protrusion of the inner wall of the sleeve, respectively.

[0011] Preferably, the free end of the card head has a truncated triangular cross-section, with the front plane abutting against the limiting ring, the upper rear plane abutting against the pressing assembly, the lower rear plane connected to the needle seat via an inclined rod, and the rear plane abutting against the protrusion on the inner wall of the sleeve.

[0012] Preferably, the inner wall of the sleeve has an inwardly protruding protrusion on the rear side of the pressing assembly, and the protrusion does not interfere with the limiting ring and the spring in the radial direction of the sleeve.

[0013] Preferably, the pressing assembly includes a pressing head and a pressing rod, wherein the diameter of the pressing head is larger than that of the pressing rod;

[0014] The sleeve is provided with a through hole corresponding to the pressing rod, and the protrusion on the inner wall of the sleeve is located on the rear side below the through hole, and the pressing rod can move along the through hole and the protrusion.

[0015] More preferably, the portion of the pressing rod located on the outside of the sleeve is fitted with a pressing spring. One end of the pressing spring is connected to the pressing head, and the other end is connected to the sleeve. When the pressing head is pressed, the pressing spring is compressed, and the pressing rod moves along the through hole and the protrusion toward the axis of the sleeve.

[0016] More preferably, an activation block is provided between the pressing head and the outer wall of the sleeve, and the activation block can restrict the radial relative movement between the pressing head and the sleeve.

[0017] Preferably, the safety venous blood collection needle further includes a protective cap, which is fitted over the outside of the puncture needle and connected to the activation block. When the protective cap is removed, it can cause the activation block to detach.

[0018] Preferably, the needle wing is located on the rear side of the chuck head.

[0019] Preferably, the needle wing is fixed to the upper side of the needle seat and extends out of the sleeve.

[0020] Preferably, the sleeve is provided with a strip-shaped hole for the needle wing to pass through and slide back and forth.

[0021] Preferably, a limiting block is provided on the inner side of the sleeve, and the limiting block can interfere with the limiting ring in the radial direction of the sleeve.

[0022] More preferably, the limiting block is an annular limiting block with a needle wing and a notch for avoiding the locking head.

[0023] Preferably, the safety venous blood collection needle includes two pressing components, which are disposed opposite to each other on the cannula. The inner wall of the cannula has two corresponding protrusions, and the outer side of the needle hub has two corresponding locking heads.

[0024] Preferably, the conduit is a flexible tube.

[0025] Preferably, a pressing component is provided on the upper side of the sleeve.

[0026] Preferably, the blood collection needle is provided with a protective sleeve on its outer side.

[0027] More preferably, the rear end of the protective sleeve is provided with an opening for the passage of a vacuum blood collection tube.

[0028] More preferably, the inner diameter of the protective sleeve is larger than the outer diameter of the vacuum blood collection tube.

[0029] More preferably, the blood collection needle does not protrude from the protective sleeve.

[0030] In this invention, the front end refers to the end closest to the person whose blood is being drawn.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. This invention, through the coordinated arrangement of a pressing component, a spring, a limiting ring, and a locking head, enables the retraction of the puncture needle by pressing, improving operational convenience and facilitating operation by medical personnel;

[0033] 2. The present invention, through the coordinated design of the pressing component, the activation block and the protective cap, can ensure the safety and reliability of the venous blood collection needle during transportation, and can also activate the pressing component during use, thus taking into account the ease of operation;

[0034] 3. The present invention, through the fixed connection design at both ends of the pressing spring and / or the setting of anti-detachment protrusions, can prevent the pressing rod from detaching from the sleeve, thereby reducing the risk of falling;

[0035] 4. The present invention, through the structural design of the clamp head, can not only provide a stable limiting effect between the limiting ring and the protrusion, but also move smoothly and stably downward under the action of the pressing rod, so as to facilitate the free end to detach from the protrusion and retract the puncture needle. The structure is simple and reliable.

[0036] 5. This invention reduces the risk of exposure of the puncture needle and blood collection needle tips by using a protective cap, a retractable puncture needle design, and a protective sheath design, thereby improving safety. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the safety-type intravenous blood collection needle of the present invention;

[0038] Figure 2 This is a schematic diagram of the puncture end structure of the original state safety-type intravenous blood collection needle of the present invention;

[0039] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0040] Figure 4 This is a schematic diagram of the puncture end structure of the retracted safety type intravenous blood collection needle of the present invention;

[0041] Figure 5 This is a schematic diagram showing the location of the anti-detachment protrusions of the present invention;

[0042] Figure 6 This is a schematic diagram of the pressing component and the card head of the present invention;

[0043] Figure 7 This is a schematic diagram of the structure of the cap and activation block of the present invention;

[0044] Figure 8 This is a schematic diagram of the free end of the card head of the present invention;

[0045] Figure 9 This is a partial schematic diagram of the retracted safety type intravenous blood collection needle of the present invention;

[0046] Figure 10 This is a schematic diagram of the structure of the limiting block and the limiting ring of the present invention;

[0047] In the diagram: 1-Needle hub, 2-Puncture needle, 3-Catheter, 4-Blood collection needle, 5-Cannula, 51-Protrusion, 52-Limiting block, 6-Pressing assembly, 61-Pressing head, 62-Pressing rod, 63-Pressing spring, 64-Anti-dislodgement protrusion, 7-Spring, 8-Limiting ring, 9-Clipper, 10-Needle wing, 11-Activation block, 12-Protective cap. Detailed Implementation

[0048] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0049] Example 1

[0050] A type of safe intravenous blood collection needle, such as Figure 1 As shown, it includes a puncture end and a blood collection end connected by catheter 3. Among them, as... Figure 2 As shown, the puncture end includes a needle hub 1, a puncture needle 2, a cannula 5, a pressing assembly 6, a spring 7, a limiting ring 8, a locking head 9, and a needle wing 10.

[0051] The needle hub 1 has a puncture needle 2 at the front end and a blood collection needle 4 at the rear end connected to the blood collection end via a catheter 3.

[0052] Needle seat 1 is located inside sleeve 5, such as Figure 3 As shown, the inner wall of the sleeve 5 has a protrusion 51. The spring 7, the limiting ring 8, and the clamp 9 are arranged sequentially from front to back on the outside of the needle seat 1. The spring 7 is sleeved on the outside of the needle seat 1, with one end abutting against the inner wall of the front end of the sleeve 5 and the other end abutting against the limiting ring 8. The limiting ring 8 is fixed on the outside of the needle seat 1. One end of the clamp 9 is connected to the outside of the needle seat 1, and the other end is a free end. The front and rear sides of the free end abut against the limiting ring 8 and the protrusion 51 on the inner wall of the sleeve 5, respectively, to limit the front and rear position of the limiting ring 8. The needle wing 10 is connected to the outside of the needle seat 1 and can slide back and forth along the sleeve 5.

[0053] During blood collection, locate the patient's vein and disinfect the skin. Holding the needle wing 10, insert the tip of the puncture needle 2 into the vein. Perform venipuncture through the puncture needle 2. After successful puncture, insert the blood collection needle 4 into the vacuum blood collection tube. Under negative pressure, blood is drawn into the blood collection tube through the puncture needle 2, catheter 3, and blood collection needle 4. After blood collection is completed, holding the needle wing 10, remove the puncture needle 2 and stop the bleeding locally.

[0054] Furthermore, in this embodiment, a pressing component 6 is provided on the cannula 5. After the puncture needle 2 is removed, pressing the pressing component 6 can disengage the free end from the protrusion 51, thereby releasing the restriction on the front and rear positions of the limiting ring 8 and releasing the compressed spring 7. Figure 4 As shown, the spring 7 drives the needle seat 1 to move backward relative to the sleeve 5 through the limiting ring 8, so as to retract the puncture needle 2 into the sleeve 5.

[0055] Example 2

[0056] A safety-type venous blood collection needle includes a pressing assembly 6 comprising a pressing head 61, a pressing rod 62, and a pressing spring 63. The diameter of the pressing head 62 is larger than that of the pressing rod 62. The pressing rod 62 passes through a through hole in the cannula 5. A protrusion 51 is located below the rear side of the through hole, with its front side flush with the inner wall of the rear side of the through hole, allowing the pressing rod 62 to move smoothly along the through hole and the protrusion 51 without jamming. The pressing spring 63 is located on the portion of the pressing rod 62 exposed outside the cannula 5. When the pressing head 61 is pressed, the pressing spring 63 is compressed, and the pressing rod 62 moves along the through hole and the protrusion 51 toward the axis of the cannula 5. This causes the free end of the clamp 9 to move toward the axis of the cannula 5 until it disengages from the protrusion 51. The restriction of the free end on the front and rear positions of the limiting ring 8 is released, allowing the compressed spring 7 to be released, thus retracting the puncture needle 2 into the cannula 5. After the pressure on the pressing head 61 is released, the pressing spring 63 can drive the pressing rod 62 to return to its original position.

[0057] As a preferred technical solution, the two ends of the pressing spring 63 are connected and fixed to the pressing head 61 and the outer wall of the sleeve 5.

[0058] The rest is the same as in Example 1.

[0059] Example 3

[0060] A type of safe intravenous blood collection needle, such as Figure 5 As shown, one end of the pressing rod 62 is connected to the pressing head 61, and the other end is provided with an anti-detachment protrusion 64, which extends radially out of the pressing rod 62.

[0061] like Figure 6 As shown, the anti-detachment protrusion 64 can be locked onto the inner wall of the sleeve 5, which can prevent the pressing rod 62 from detaching from the through hole of the sleeve 5 and improve reliability.

[0062] The rest is the same as in Example 2.

[0063] Example 4

[0064] A type of safe intravenous blood collection needle, such as Figure 7 As shown, an activation block 11 is provided between the pressing head 61 and the outer wall of the cannula 5. The activation block 11 can restrict the radial relative movement between the pressing head 61 and the cannula 5, reducing the risk of the pressing assembly 6 being accidentally touched during the transportation of the venous blood collection needle.

[0065] A protective cap 12 is provided on the outside of the puncture needle 2. The protective cap 12 is detachably installed on the cannula 5 and connected to the activation block 11. The protective cap 12 can protect the puncture needle 2 during the transportation of the venous blood collection needle. When collecting blood, the protective cap 12 is removed to expose the puncture needle 2. When the protective cap 12 is removed, the activation block 11 is driven to detach, realizing the activation of the pressing component 6. Subsequently, it is convenient for the user to press the pressing component 6 to retract the puncture needle 2 into the cannula 5.

[0066] The rest is the same as in Example 3.

[0067] Example 5

[0068] A type of safe intravenous blood collection needle, such as Figure 8 As shown, the free end of the chuck 9 has an upper inclined surface 91, a front plane 92, an upper plane 93, and a rear plane 94. The upper inclined surface 91 slopes downward from back to front. The front plane 92 abuts against the limiting ring 8, the upper plane 93 abuts against the pressing rod 62, and the rear plane 94 abuts against the protrusion 51. In this embodiment, the free end of the chuck 9 is connected to the pin seat 1 via a forward-sloping rod.

[0069] The rest is the same as in Example 4.

[0070] Example 6

[0071] A type of safe intravenous blood collection needle, such as Figure 9 As shown, the sleeve 5 is provided with a strip-shaped hole for the needle wing 10 to pass through and slide back and forth, and the inner side of the sleeve 5 is provided with a limiting block 52, which can limit the backward movement of the limiting ring 8.

[0072] As a preferred technical solution, such as Figure 10 As shown, the limiting block 52 is an annular limiting block with an avoidance notch. During the process of the needle seat 1 moving backward relative to the sleeve 5, the needle wing 10 and the clamp 9 can pass through the notch.

[0073] The rest is the same as in Example 5.

[0074] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A safety-type intravenous blood collection needle, characterized in that, It includes a needle hub (1), a puncture needle (2), a catheter (3), a blood collection needle (4), a cannula (5), a pressing assembly (6), a spring (7), a limiting ring (8), a locking head (9), and a needle wing (10); The needle hub (1) has a puncture needle (2) at the front end and a blood collection needle (4) at the rear end via a catheter (3); The needle seat (1) is set inside the sleeve (5), and a pressing component (6) is passed through the sleeve (5). The inner wall of the sleeve (5) is provided with a protrusion. The spring (7), the limiting ring (8) and the clamp (9) are arranged in sequence from front to back on the outside of the needle seat (1). The spring (7) is sleeved on the outside of the needle seat (1), with one end abutting against the sleeve (5) and the other end abutting against the limiting ring (8) fixed on the outside of the needle seat (1). One end of the chuck (9) is connected to the outside of the needle seat (1), and the other end is a free end. The front and rear sides of the free end abut against the limiting ring (8) and the protrusion of the inner wall of the sleeve (5) respectively. The free end can disengage from the protrusion of the inner wall of the sleeve (5) under the action of the pressing component (6). The needle wing (10) is connected to the outside of the needle seat (1) and can slide back and forth along the sleeve (5).

2. The safety-type venous blood collection needle according to claim 1, characterized in that, The free end cross-section of the card head (9) is truncated triangular. The front plane abuts against the limiting ring (8), the upper rear plane abuts against the pressing component (6), the lower rear plane is connected to the needle seat (1) through the inclined rod, and the rear plane abuts against the protrusion of the inner wall of the sleeve (5).

3. The safety-type venous blood collection needle according to claim 1, characterized in that, The inner wall of the sleeve (5) has an inwardly protruding protrusion on the rear side of the pressing assembly (6), and the protrusion does not interfere with the limiting ring (8) and the spring (7) in the radial direction of the sleeve (5).

4. The safety-type venous blood collection needle according to claim 1, characterized in that, The pressing assembly (6) includes a pressing head (61) and a pressing rod (62), wherein the diameter of the pressing head (61) is larger than that of the pressing rod (62); The sleeve (5) is provided with a through hole corresponding to the pressing rod (62). The protrusion on the inner wall of the sleeve (5) is located below the rear side of the through hole. The pressing rod (62) can move along the through hole and the protrusion.

5. The safety-type venous blood collection needle according to claim 4, characterized in that, The pressing rod (62) located outside the sleeve (5) is fitted with a pressing spring (63). One end of the pressing spring (63) is connected to the pressing head (61), and the other end is connected to the sleeve (5). When the pressing head (61) is pressed, the pressing spring (63) is compressed, and the pressing rod (62) moves along the through hole and the protrusion toward the axis of the sleeve (5).

6. The safety-type venous blood collection needle according to claim 5, characterized in that, An activation block (11) is provided between the pressing head (61) and the outer wall of the sleeve (5). The activation block (11) can restrict the radial relative movement between the pressing head (61) and the sleeve (5).

7. The safety-type venous blood collection needle according to claim 6, characterized in that, The safety-type venous blood collection needle also includes a protective cap (12), which is fitted on the outside of the puncture needle (2) and connected to the activation block (11). When the protective cap (12) is removed, the protective cap (12) can drive the activation block (11) to detach.

8. The safety-type venous blood collection needle according to claim 1, characterized in that, The sleeve (5) is provided with a strip-shaped hole for the needle wing (10) to pass through and slide back and forth; The sleeve (5) is provided with a limiting block on the inner side, and the limiting block can interfere with the limiting ring (8) in the radial direction of the sleeve (5).

9. The safety-type venous blood collection needle according to claim 1, characterized in that, The safety-type venous blood collection needle includes two pressing components (6), which are arranged opposite to each other on the cannula (5). The inner wall of the cannula (5) is provided with two protrusions, and the outer side of the needle seat (1) is provided with two locking heads (9).

10. The safety-type venous blood collection needle according to claim 1, characterized in that, The catheter (3) is a soft tube, and the blood collection needle (4) has a protective sleeve on the outside.

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