Needle retreating type negative pressure blood sampling pen
By designing a needle-removable negative pressure blood collection pen, the structure of the pen cap, trigger and blood collection needle is used to achieve safe needle removal after blood collection and avoid secondary stab wounds, solving the problem that existing blood collection pens are difficult to safely remove needle removal and secondary stab wounds.
Patent Information
- Application Number
- CN202421756430.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-24
AI Technical Summary
The existing blood collection pen is difficult to safely withdraw the needle after blood collection is completed, which can easily cause needle stabbing. Moreover, due to the instability after spring triggering, it is easy to cause secondary stabbing.
A needle-removable negative pressure blood collection pen was designed, and the needle-removable structures were set up to achieve safe needle-removal by setting up a pen cap, trigger and blood collection needle. After the blood collection is completed, the pen cap twists the reverse direction, causing the arc block to drive the blood collection needle to lower it, avoiding the stab wound caused by the blood collection needle alone. At the same time, secondary stabbing is avoided through the release of spring C and the attraction of magnetic blocks.
The safe needle removal function of the blood collection pen is realized, which avoids needle stabbing, and avoids secondary stabbing through a stable triggering mechanism, improving the safety of blood collection.
Smart Images
Figure CN222929764U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of blood collection, in particular to a retractable needle-type negative pressure blood collection pen. Background Art
[0002] The lancing pen is a pen-shaped blood collection device that is used in conjunction with a disposable sterile lancing needle. It is a manual ejection-assisted blood collection device for collecting peripheral blood samples from the human body. The existing painless negative pressure lancing pen assists in blood collection through an ejection structure inside the lancing pen, but the lancing pen with this structure does not have a needle withdrawal function. When in use, the lancing needle is inserted into the needle holder, and the lancing needle needs to be pulled out after the blood collection is completed. The needle is relatively sharp, and it needs to be pulled out forcefully when removing it, which can easily cause punctures and infections.
[0003] In the existing blood collection pen, the blood collection needle is inserted from the pen into the human skin to cause bleeding. In the prior art, a spring is often used to trigger the blood collection needle, and two springs are used to restrain the base so that the blood collection needle is located within the limit and triggered. However, the spring is elastic and will be squeezed or released in the same direction again after being compressed once, which may easily cause secondary punctures and cannot ensure the stability of the spring after being triggered. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides a retractable needle-type negative pressure blood collection pen, which has the advantages of easy needle retraction and triggering a stable needle, and solves the problems raised by the above-mentioned background technology.
[0005] The utility model provides the following technical solution: a retractable needle-type negative pressure blood collection pen, comprising a pen barrel, a pen column and a pen cover, wherein the pen barrel is internally slidably sleeved with the pen column, the bottom outer circle of the pen barrel is threadedly sleeved with the pen cover, the pen barrel is internally slidably sleeved with a trigger, and the trigger is internally slidably sleeved with a blood collection needle.
[0006] Preferably, a slide groove is provided inside the pen barrel, the pen column is slidably sleeved inside the slide groove, a cavity A is provided inside the pen barrel at the slide groove, a cavity B is provided at the bottom of the pen barrel, and a fixed block is fixedly installed at the opening of cavity A at the top of the pen barrel.
[0007] Preferably, a finger groove is provided on the top of the pen column, and the finger groove is adapted for the fingertips. A card block is provided inside the A cavity of the pen column, and a cylinder is fixedly installed between the inner wall of the pen column and the top of the card block. A hole for accommodating the sliding of the cylinder is provided inside the fixed block, and a spring A is fixedly connected between the bottom of the fixed block and the top of the card block.
[0008] Preferably, a needle holder is fixedly installed inside the pen barrel within the B cavity. A magnetic block A is fixedly installed on the inner circle of the bottom of the needle holder. A clamping seat is fixedly installed on the top of the needle holder. A clamping ring is fixedly installed on the top wall of the clamping seat. A connecting piece is fixedly installed on the outer circle of the needle holder at the bottom of the pen barrel. An extrusion column is slidably installed at the position of the clamping seat on one side of the pen barrel. A card slot is opened between the A cavity and the B cavity, and the card slot is opened on the inner circle of the clamping ring. A threaded groove is opened on the outer circle of the connecting piece. A thread is opened on the inner circle of the pen cap. The thread is adapted to the threaded groove. The pen cap is threadedly sleeved on the outer circle of the connecting piece. The inside of the pen cap is fixedly installed with arc-shaped blocks evenly in a circular ring shape, and there are intervals between the arc-shaped blocks. The arc-shaped blocks form a hollow circle in the middle of the inside of the pen cap.
[0009] Preferably, the trigger is slidably sleeved inside the needle holder and the clamping seat. A magnetic block C is provided on the outer circle of the trigger. The magnetic block C attracts the magnetic block A with opposite polarity. A fixing column is fixedly installed on the top of the trigger. A hole for the fixing column to slide is opened inside the needle holder and the clamping seat. A magnetic block D is fixedly installed on the top of the fixing column. The magnetic block D attracts the magnetic block B with opposite polarity. A spring B is fixedly connected between the bottom of the magnetic block D and the bottom wall of the A cavity. A spring C is fixedly connected between the top of the trigger and the top wall of the inner cavity of the needle holder.
[0010] Preferably, the blood collection needle is movably connected to the inside of the trigger. A rubber ring is provided on the inner wall of the trigger. A circular groove is opened on the outer circle of the blood collection needle.
[0011] Compared with the prior art, the present utility model has the following beneficial effects:
[0012] 1. For this retractable needle negative pressure blood collection pen, by setting structures such as a pen cap, a trigger, and a blood collection needle, safe needle retraction is achieved. Twist the pen cap in the reverse direction to separate the pen cap from the pen barrel. Insert the blood collection needle into the inside of the trigger. Rotate the pen cap in the forward direction at the bottom of the pen barrel so that the pen cap spirally rises on the outer circle of the bottom of the pen barrel. Due to the spiral rise of the pen cap, the arc-shaped blocks deform and rise following the pen cap, and then the arc-shaped blocks return to the original state and are stuck on the outer circle of the circular groove. After blood collection, when the blood collection needle needs to be withdrawn, twist the pen cap on the outer circle of the connecting piece in the reverse direction to spiral down. The arc-shaped blocks are stuck at the bottom of the circular groove. Twist the pen cap forcefully so that the arc-shaped blocks drive the blood collection needle to descend together, avoiding stabbing caused by removing the blood collection needle alone, and achieving the effect of safe needle retraction.
[0013] 2. The retractable needle negative pressure blood collection pen can avoid secondary stabbing by setting up structures such as a pen barrel, a pen cap, and a blood collection needle. Since spring C is compressed, spring C needs to be released, driving the trigger and the blood collection needle to move towards the opening of the pen cap, so that the needle at the end of the blood collection needle stabs the skin. Due to the negative pressure in the cavity, a blood spot quickly appears on the stabbed skin. When the release of spring C is completed, due to the spring elasticity, it will move in the reverse direction, preventing spring C and spring B from stabbing the needle out again. When the trigger moves downward again, magnet C will be attracted by magnet A and stop at magnet A, achieving the effect of avoiding secondary stabbing of the skin. Description of the Drawings
[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model;
[0015] Figure 2 It is a cross-sectional view of the overall structure of the present utility model;
[0016] Figure 3 It is an exploded cross-sectional view of the overall structure of the present utility model;
[0017] Figure 4 is Figure 2 the enlarged view of part A in
[0018] Figure 5 It is a cross-sectional view of the pen column structure of the present utility model.
[0019] In the figure: 1. Pen barrel; 11. Slide groove; 12. Fixed block; 13. Needle seat; 131. Magnet A; 14. Card holder; 141. Snap ring; 15. Connector; 16. Extrusion column; 17. Card slot; 2. Pen column; 21. Finger groove; 22. Clamping block; 221. Z-shaped block; 222. Magnet B; 23. Cylinder; 24. Spring A; 3. Pen cap; 31. Arc-shaped block; 4. Trigger; 41. Magnet C; 42. Magnet D; 421. Fixed column; 43. Rubber ring; 5. Blood collection needle; 51. Round groove. Detailed Implementation Modes
[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0021] Please refer to Figures 1 - 5, A retractable needle negative pressure blood collection pen, comprising a pen barrel 1, a pen column 2, and a pen cap 3. The pen column 2 is slidably sleeved inside the pen barrel 1. The outer ring of the bottom of the pen barrel 1 is threadedly sleeved with the pen cap 3. A trigger 4 is slidably sleeved inside the pen barrel 1. A blood collection needle 5 is slidably sleeved inside the trigger 4. A chute 11 is provided inside the pen barrel 1. The pen column 2 is slidably sleeved inside the chute 11. An A cavity is provided inside the pen barrel 1 at the position of the chute 11. A B cavity is provided at the bottom of the pen barrel 1. A fixed block 12 is fixedly installed at the opening of the A cavity at the top of the pen barrel 1. A finger groove 21 is provided at the top of the pen column 2. The finger groove 21 is adapted to the finger pulp. A clamping block 22 is provided inside the pen column 2 in the A cavity. A cylinder 23 is fixedly installed between the inner wall of the pen column 2 and the top of the clamping block 22. A hole for the cylinder 23 to slide is provided inside the fixed block 12. A spring A 24 is fixedly connected between the bottom of the fixed block 12 and the top of the clamping block 22.
[0022] Please refer to Figures 1 - 4 , A needle seat 13 is fixedly installed inside the B cavity of the pen barrel 1. A magnetic block A 131 is fixedly installed on the inner ring of the bottom of the needle seat 13. A clamping seat 14 is fixedly installed at the top of the needle seat 13. A clamping ring 141 is fixedly installed on the top wall of the clamping seat 14. A connecting piece 15 is fixedly installed on the outer ring of the bottom of the pen barrel 1 at the position of the needle seat 13. An extrusion column 16 is slidably installed on one side of the pen barrel 1 at the position of the clamping seat 14. A card slot 17 is provided between the A cavity and the B cavity, and the card slot 17 is provided inside the inner ring of the clamping ring 141. A thread groove is provided on the outer ring of the connecting piece 15. A thread is provided on the inner ring of the pen cap 3. The thread is adapted to the thread groove. The pen cap 3 is threadedly sleeved on the outer ring of the connecting piece 15. Arc-shaped blocks 31 are fixedly installed inside the pen cap 3 in a circular ring shape and evenly. There are intervals between the arc-shaped blocks 31. The arc-shaped blocks 31 form a hollow circle in the middle of the inside of the pen cap 3.
[0023] Please refer to Figures 1 - 4 , The trigger 4 is slidably sleeved inside the needle seat 13 and the clamping seat 14. A magnetic block C 41 is provided on the outer ring of the trigger 4. The magnetic block C 41 and the magnetic block A 131 attract each other with opposite polarities. A fixed column 421 is fixedly installed at the top of the trigger 4. A hole for the fixed column 421 to slide is provided inside the needle seat 13 and the clamping seat 14. A magnetic block D 42 is fixedly installed at the top of the fixed column 421. The magnetic block D 42 and the magnetic block B 222 attract each other with opposite polarities. A spring B is fixedly connected between the bottom of the magnetic block D 42 and the bottom wall of the A cavity. A spring C is fixedly connected between the top of the trigger 4 and the top wall of the inner cavity of the needle seat 13. The blood collection needle 5 is movably connected inside the trigger 4. A rubber ring 43 is provided on the inner wall of the trigger 4. When the rubber ring 43 contacts the blood collection needle 5, the friction force increases, so that the blood collection needle 5 is fixed inside the trigger 4. A circular groove 51 is provided on the outer ring of the blood collection needle 5.
[0024] Please refer to Figures 1 - 5, twist the pen cap 3 in the reverse direction to disengage the pen cap 3 from the pen barrel 1. Insert the blood collection needle 5 into the interior of the trigger 4. Due to the restriction of the rubber ring 43, the blood collection needle 5 is fixed inside the trigger 4. Rotate the pen cap 3 in the forward direction at the bottom of the pen barrel 1 so that the pen cap 3 spirally ascends on the outer circle at the bottom of the pen barrel 1. The arc-shaped block 31 first touches the bottom of the blood collection needle 5 and will not touch the needle tip. Due to the spiral ascent of the pen cap 3, the arc-shaped block 31 deforms and ascends with the pen cap 3. Subsequently, the arc-shaped block 31 returns to its original state and gets stuck outside the circular groove 51. The arc-shaped block 31 will not affect the needle tip piercing the skin. After blood collection, it is necessary to withdraw the blood collection needle 5 to avoid cross-infection caused by reusing the needle tip. Twist the pen cap 3 in the reverse direction on the outer circle of the connecting piece 15 to spiral down. The arc-shaped block 31 gets stuck at the bottom of the circular groove 51. Twist the pen cap 3 forcefully so that the arc-shaped block 31 drives the blood collection needle 5 to descend together to avoid being stabbed when removing the blood collection needle 5 alone.
[0025] Please refer to Figures 1 - 5 , after placing the blood collection needle 5 inside the trigger 4, press the pen column 2 with the pulp of the finger so that the clamping block 22 snaps into the interior of the clamping seat 14. The clamping ring 141 will engage with the Z-shaped block 221. When a "click" sound is heard, it means the engagement is completed. Place the finger pulp to be blood-collected under the pen cap 3 to block the outlet under the pen cap 3. Press the extrusion column 16. The extrusion column 16 will squeeze the clamping block 22, causing the clamping block 22 to deform and making the clamping block 22 in misaligned contact with the clamping seat 14, releasing the contact restriction. The clamping block 22 slides upward due to the strong pulling force of the spring A 24. Since the interior of the clamping block 22 and the A cavity is in a sealed state, all the air inside the cavity will be pumped out, creating a negative pressure state inside the A cavity and the B cavity, causing the finger pulp to be adsorbed at the opening of the pen cap 3 and making the skin suck out a small bump state at the opening of the pen cap 3. Due to the opposite-sex attraction between the magnet B 222 and the magnet D 42, it will drive the trigger 4 and the blood collection needle 5 to slide upward simultaneously. When the magnet B 222 moves away from the magnet D 42 and the magnet D 42 is detached from the magnetic attraction of the magnet B 222, since the spring C is compressed, the spring C needs to be released, driving the trigger 4 and the blood collection needle 5 to move towards the opening of the pen cap 3, causing the needle tip at the end of the blood collection needle 5 to pierce the skin. Due to the negative pressure inside the cavity, a blood spot quickly appears on the pierced skin. When the spring C has completed its release, due to the spring force, it will move in the reverse direction to prevent the spring C and the spring B from stabbing the needle tip out again. When the trigger 4 moves downward again, the magnet C 41 will be attracted by the magnet A 131 and stop at the magnet A 131 to avoid the skin being stabbed a second time.
[0026] Working principle: Twist the pen cap 3 in the reverse direction to separate the pen cap 3 from the pen barrel 1. Insert the blood collection needle 5 into the inside of the trigger 4. Due to the restriction of the rubber ring 43, the blood collection needle 5 is fixed inside the trigger 4. Rotate the pen cap 3 in the forward direction at the bottom of the pen barrel 1 so that the pen cap 3 spirally ascends on the outer circle at the bottom of the pen barrel 1. Due to the spiral ascent of the pen cap 3, the arc-shaped block 31 deforms and ascends following the pen cap 3. Subsequently, the arc-shaped block 31 returns to its original state and gets stuck outside the circular groove 51. Press the pen column 2 with the finger pulp to make the clamping block 22 snap into the inside of the clamping seat 14. The clamping ring 141 engages with the Z-shaped block 221. When a "click" sound is heard, it means the engagement is completed. Place the finger pulp to be blood-collected under the pen cap 3 to block the outlet under the pen cap 3. Next, press the extrusion column 16. The extrusion column 16 will squeeze the clamping block 22 to deform, causing the clamping block 22 to be in misaligned contact with the clamping seat 14. The clamping block 22 slides upward due to the strong pulling force of the spring A 24. Since the inside of the clamping block 22 and the A cavity is in a sealed state, all the air inside the cavity will be pumped away, creating a negative pressure state inside the A cavity and the B cavity, causing the finger pulp at the opening of the pen cap 3 to be sucked into a small bag state. Due to the opposite-sex attraction between the magnetic block B 222 and the magnetic block D 42, it will drive the trigger 4 and the blood collection needle 5 to slide upward simultaneously. When the magnetic block B 222 moves away from the magnetic block D 42 and disengages from the magnetic attraction of the magnetic block B 222, the spring C drives the trigger 4 and the blood collection needle 5 to move towards the opening of the pen cap 3, causing the needle tip at the end of the blood collection needle 5 to pierce the skin. Due to the negative pressure inside the cavity, a blood spot quickly appears on the pierced skin. When the spring C finishes releasing, due to the spring elasticity, it will move in the reverse direction to prevent the spring C and the spring B from piercing the needle out again. When the trigger 4 moves downward again, the magnetic block C 41 will be attracted by the magnetic block A 131 and stop at the magnetic block A 131 to prevent the skin from being stabbed again. After blood collection, the needle needs to be withdrawn to avoid cross-infection caused by reusing the needle. Twist the pen cap 3 in the reverse direction on the outer circle of the connecting piece 15 to spiral down. The arc-shaped block 31 gets stuck at the bottom of the circular groove 51. Twist the pen cap 3 forcefully to make the arc-shaped block 31 drive the blood collection needle 5 to descend together, avoiding stabbing when removing the blood collection needle 5 alone.
Claims
1. A retractable needle type negative pressure blood collection pen, comprising a pen holder (1), a pen column (2), and a pen cover (3), characterized in that: The pen barrel (1) is internally slidably sleeved with a pen column (2), the outer circle of the bottom of the pen barrel (1) is threadedly sleeved with a pen cap (3), the pen barrel (1) is internally slidably sleeved with a trigger (4), and the trigger (4) is internally slidably sleeved with a blood collection needle (5).
2. The retractable needle negative pressure blood collection device according to claim 1, characterized in that: The pen barrel (1) is provided with a slide groove (11) inside, the pen column (2) is slidably sleeved inside the slide groove (11), the pen barrel (1) is provided with a cavity A at the slide groove (11), the bottom of the pen barrel (1) is provided with a cavity B, and a fixing block (12) is fixedly installed at the top of the pen barrel (1) at the opening of cavity A.
3. A retractable needle type negative pressure blood collection device according to claim 2, characterized in that: The top of the pen column (2) is provided with a finger groove (21), and the finger groove (21) is adapted to fit the fingertips; the pen column (2) is provided with a clamping block (22) inside the A cavity; a cylinder (23) is fixedly installed between the inner wall of the pen column (2) and the top of the clamping block (22); a hole for accommodating the cylinder (23) to slide is provided inside the fixed block (12); and a spring A (24) is fixedly connected between the bottom of the fixed block (12) and the top of the clamping block (22).
4. The retractable needle negative pressure blood collection device according to claim 3, characterized in that: The interior of the pen holder (1) is located in cavity B and is fixedly installed with a needle seat (13); the inner ring of the bottom of the needle seat (13) is fixedly installed with a magnetic block A (131); the top of the needle seat (13) is fixedly installed with a clamping seat (14); the top wall of the clamping seat (14) is fixedly installed with a clamping ring (141); the bottom of the pen holder (1) is located in the outer ring of the needle seat (13) and is fixedly installed with a connecting piece (15); one side of the pen holder (1) is located at the clamping seat (14) and is slidably installed with an extrusion column (16); and between the cavity A and the cavity B. A clamping groove (17) is provided, and the clamping groove (17) is located in the inner circle of the clamping ring (141); a thread groove is provided on the outer circle of the connecting piece (15); a thread is provided on the inner circle of the pen cap (3); the thread is matched with the thread groove; the pen cap (3) is threadedly sleeved on the outer circle of the connecting piece (15); the interior of the pen cap (3) is in a circular ring shape and arc blocks (31) are evenly fixedly installed, and there are intervals between the arc blocks (31); the arc blocks (31) are located in the middle of the interior of the pen cap (3) to form a hollow circle.
5. The retractable needle negative pressure blood collection device according to claim 4, characterized in that: The trigger (4) is slidably sleeved inside the needle seat (13) and the card seat (14); a magnetic block C (41) is provided on the outer ring of the trigger (4); the magnetic block C (41) and the magnetic block A (131) are attracted to each other by opposite charges; a fixing column (421) is fixedly installed on the top of the trigger (4); holes for accommodating the sliding of the fixing column (421) are provided inside the needle seat (13) and the card seat (14); a magnetic block D (42) is fixedly installed on the top of the fixing column (421); the magnetic block D (42) and the magnetic block B (222) are attracted to each other by opposite charges; a spring B is fixedly connected between the bottom of the magnetic block D (42) and the bottom wall of the A cavity; and a spring C is fixedly connected between the top of the trigger (4) and the top wall of the inner cavity of the needle seat (13).
6. The retractable needle negative pressure blood collection device according to claim 5, characterized in that: The blood collection needle (5) is movably connected to the inside of the trigger (4), the inner wall of the trigger (4) is provided with a rubber ring (43), and the outer ring of the blood collection needle (5) is provided with a circular groove (51).