A puncture integrated mechanism for venous blood sampling and indwelling needle
By designing an integrated mechanism for venous blood collection and indwelling needle insertion, the risk of aseptic contamination and pipeline blockage during simultaneous venous blood collection and indwelling needle insertion has been solved, enabling safe and convenient simultaneous venous blood collection and indwelling needle insertion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG UNIV
- Filing Date
- 2025-04-09
- Publication Date
- 2026-05-29
AI Technical Summary
When performing venous blood collection and indwelling venous catheter insertion simultaneously, the heparin cap interface needs to be removed, which poses a risk of aseptic operation contamination. In addition, the indwelling needle tubing is prone to blockage, resulting in low applicability.
An integrated puncture mechanism for venous blood collection and indwelling needle insertion was designed, comprising a needle-puncture protection shield, a steel needle, a three-way catheter seat, a long catheter, a limiting mechanism, and a flow-stopping mechanism, enabling simultaneous operation of venous blood collection and indwelling needle insertion, preventing blood clotting and blockage, and reducing wound and skin discomfort.
This allows for simultaneous venous blood collection and indwelling needle placement, reducing the risk of contamination during aseptic procedures, preventing catheter blockage, minimizing patient discomfort, and improving ease of use and safety.
Smart Images
Figure CN224291909U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically to an integrated puncture mechanism for venous blood collection and indwelling needle insertion. Background Technology
[0002] An indwelling needle, also known as a venous catheter, is a clinical infusion tool primarily composed of a stainless steel core needle, a flexible outer cannula, and a plastic needle hub. Its core components include a flexible cannula for insertion into the blood vessel, a stainless steel puncture guide needle, and a plastic hub for securing the patient externally. During use, blood can be drawn from a vein through the indwelling needle. However, current research on simultaneous blood collection and indwelling needle insertion typically involves the operator separately disconnecting the heparin cap, drawing blood with a syringe, and then injecting it into a vacuum blood collection tube; or connecting an external venous blood collection device to the heparin cap of the indwelling needle. However, venous blood collection is a highly aseptic procedure, and separate connection methods pose a risk of contamination.
[0003] To overcome the aforementioned deficiencies, existing technology (Chinese Patent No. CN208927260U, Publication Date: 2019-06-04) provides an indwelling needle comprising an indwelling tube, a blood collection component, a drug injection component, and a puncture needle component. The indwelling tube is connected to the blood collection needle hub via a blood collection tube. The blood collection needle sleeve is placed outside the blood collection needle. The indwelling tube is connected to the drug injection port via a flexible tube. The puncture needle hub is detachably connected to the indwelling tube. The puncture needle is fixedly connected to the puncture needle hub. The tip of the puncture needle penetrates the front end of the indwelling tube and is provided with a sheath. The puncture needle holder passes through the puncture needle and fits against the puncture needle hub. A slidable isolation plug is provided inside the indwelling tube. A vent is provided near the rear end of the isolation plug near the rear end of the indwelling tube, and a sealing plug is provided at the rear end of the vent. This achieves the goal of enabling the indwelling needle to not only administer intravenous fluids but also collect blood, avoiding multiple punctures for the patient and reducing the risk of infection.
[0004] The aforementioned device uses a sliding isolation plug to allow the indwelling needle to not only administer intravenous fluids but also collect blood. However, in actual use, after blood collection, blood residue remains inside the tubing. Since the connecting tubing of the indwelling needle is relatively thin, the blood residue can clot and cause blockage. Furthermore, the connecting tubing left near the indwelling needle requires additional fixation, resulting in low overall usability. Utility Model Content
[0005] The purpose of this invention is to provide an integrated puncture mechanism for venous blood collection and indwelling needle insertion, addressing the aforementioned background technology that proposes venous blood collection via indwelling needle insertion. Current research on simultaneous venous blood collection and indwelling needle insertion involves the operator separately disconnecting the heparin cap, using a syringe to aspirate blood, and then injecting it into a vacuum blood collection tube; or connecting an external venous blood collection device to the heparin cap of the indwelling needle. However, venous blood collection is a highly aseptic procedure, and separate connection methods pose a risk of contamination.
[0006] To achieve the above objectives, this utility model provides the following technical solution: an integrated puncture mechanism for venous blood collection and indwelling needle insertion, comprising an anti-puncture protective cover, a needle handle installed on the side of the anti-puncture protective cover, and a steel needle fixedly connected to the upper end of the anti-puncture protective cover; a three-way catheter seat is sleeved on the outside of the steel needle, and a sleeve is installed on the upper end of the three-way catheter seat; a needle tube sheath is sleeved on the outside of the sleeve; a long catheter is installed on the side of the three-way catheter seat, and a heparin cap is provided at one end of the long catheter; a connecting tube is installed at the bottom end of the anti-puncture protective cover, and an auxiliary blood collection mechanism for blood collection is provided at one end of the connecting tube; the auxiliary blood collection mechanism includes a mounting base, and the mounting base is connected to the other end of the connecting tube; a tube plug puncture needle is sleeved on the outside of the mounting base; an elastic limiting band is installed at the bottom end of the three-way catheter seat, and limiting mechanisms for reducing catheter position deviation are provided on both sides of the elastic limiting band.
[0007] Furthermore, the limiting mechanism includes placement grooves, which are formed on both sides of the elastic limiting band, and the positions of the placement grooves correspond to each other.
[0008] Furthermore, a hook and loop fastener is installed at the top of the placement groove on one side of the elastic limiting band, and a hook and loop fastener is installed at the bottom of the placement groove on the other side of the elastic limiting band, with the hook and loop fastener and hook and loop fastener being mutually compatible.
[0009] Furthermore, the cross-section of the placement groove is semi-circular, and the inner diameter of the placement groove is larger than the diameter of the conduit.
[0010] Furthermore, a flow-stopping mechanism is provided on the outside of the long conduit. The flow-stopping mechanism includes a flow-stopping clamp, which is sleeved on the outside of the long conduit. Both ends of the flow-stopping clamp are slidably connected with adjusting teeth, and both ends of the flow-stopping clamp are provided with limiting grooves that match the adjusting teeth. A pressing block is fixedly connected to one side between the adjusting teeth.
[0011] Furthermore, the pressing block is disposed at the upper end of the long guide tube, and the limiting groove is inclinedly disposed at both ends of the flow stop clamp.
[0012] Furthermore, both ends of the needle handle are fixedly connected to anti-slip blocks, and the anti-slip blocks are evenly distributed on the surface of the needle handle.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. By pinching the needle handle and inserting the steel needle and cannula into the blood vessel, when venous blood collection is required, the tube plug puncture needle is inserted into the vacuum blood collection tube. The connecting tube can be used to transport venous blood. When inserting the indwelling needle, venous blood collection is completed simultaneously, which can effectively reduce the discomfort caused by repeated punctures to the patient and reduce the formation of wounds. After blood collection, the steel needle and the mounting base are withdrawn simultaneously, without affecting subsequent infusion and injection of drugs.
[0015] Furthermore, a portion of saline solution is injected into the long catheter through the heparin cap to ensure the indwelling needle is unobstructed and to seal the long catheter. Injecting saline solution into the long catheter also flushes the area between the cannula and the three-way catheter holder, preventing blood from clotting and blocking the long catheter, thus facilitating subsequent infusion.
[0016] Furthermore, by using an elastic limiting band to limit the position of the long catheter, the elastic limiting band is wrapped around the wrist, which can reduce the displacement of the long catheter and reduce discomfort on the skin surface. The long catheter is placed inside the placement groove, and the arc groove of the placement groove can fit against the outside of the long catheter, thereby limiting the position of the long catheter and preventing displacement.
[0017] 2. By rotating the adjusting teeth towards the end near the heparin cap, the pressing block will be positioned downwards, allowing it to press the long catheter placed inside the stopcock. When the adjusting teeth move to the side of the limiting groove, the pressing block will thoroughly press the stopcock, effectively preventing blood backflow.
[0018] Furthermore, during intravenous infusion, adjusting the position of the pressure point can regulate the infusion rate, preventing discomfort to the patient caused by excessively rapid drug delivery. Attached Figure Description
[0019] Figure 1 This is a front view structural diagram of the present utility model.
[0020] Figure 2 This is a top sectional view of the structure of this utility model.
[0021] Figure 3 This is a schematic diagram of the limiting mechanism of this utility model.
[0022] Figure 4 This is a schematic diagram of the flow-stopping mechanism of this utility model.
[0023] Figure 5This is a schematic diagram of the structure of the steel needle and sleeve of this utility model.
[0024] Figure 6 This is a schematic diagram of the connection structure between the mounting base and the tube plug puncture needle of this utility model.
[0025] In the diagram: 1. Anti-puncture protective cover; 2. Needle handle; 3. Anti-slip block; 4. Steel needle; 5. Sleeve; 6. Heparin cap; 7. Needle tube sheath; 8. Connecting tube; 9. Mounting seat; 10. Tube plug puncture needle; 11. Elastic limiting band; 12. Placement groove; 13. Velcro rough side; 14. Velcro hook side; 15. Flow stop clip; 16. Limiting groove; 17. Adjusting teeth; 18. Pressing block; 19. Three-way catheter seat; 20. Long catheter. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] Example 1: As Figure 1 , Figure 2 , Figure 5 and Figure 6 The technical solution shown is designed to address the issue of blood collection from veins via indwelling needles. However, current research on simultaneous blood collection and indwelling needle insertion requires the operator to additionally disconnect the heparin cap, use a syringe to aspirate blood, and then inject it into a vacuum blood collection tube; or to connect an external blood collection device to the heparin cap of the indwelling needle. However, intravenous blood collection is a highly aseptic procedure, and separate interface operations pose a risk of contamination. This integrated puncture mechanism for intravenous blood collection and indwelling needles discloses a blood collection auxiliary mechanism, including a needle-puncture protection cover 1. A needle handle 2 is installed on the side of the needle-puncture protection cover 1, and a steel needle 4 is fixedly connected to the upper end of the needle-puncture protection cover 1. A three-way catheter seat 19 is sleeved on the outside of the steel needle 4, and a cannula 5 is installed on the upper end of the three-way catheter seat 19. A needle tube sheath 7 is sleeved on the outside of the cannula 5. A long catheter 20 is installed on the side of the three-way catheter seat 19, and a heparin cap 6 is provided at one end of the long catheter 20. A connecting tube 8 is installed at the bottom end of the needle-puncture protection cover 1, and an auxiliary blood collection mechanism for blood collection is provided at one end of the connecting tube 8. The auxiliary blood collection mechanism includes a mounting base 9, and the mounting base 9 is connected to the other end of the connecting tube 8. A tube plug puncture needle 10 is sleeved on the outside of the mounting base 9.
[0028] In this example, after disinfecting the patient's skin, the needle sheath 7 is separated from the indwelling needle. The needle handle 2 is pinched, and the steel needle 4 and cannula 5 are inserted into the blood vessel. When venous blood collection is required, the tube plug puncture needle 10 is inserted into the vacuum blood collection tube. The venous blood can be transported using the connecting tube 8. After blood collection, the needle handle 2 is pinched again, and the anti-puncture protective cover 1 and steel needle 4 are withdrawn from the cannula 5 and the three-way catheter seat 19. Then, a portion of normal saline is injected into the long catheter 20 through the heparin cap 6 to ensure the patency of the indwelling needle. At the same time, injecting normal saline into the long catheter 20 can also flush the area between the cannula 5 and the three-way catheter seat 19 to prevent blood from clotting and blocking the long catheter 20, facilitating subsequent infusion. Venous blood collection is completed simultaneously with the indwelling needle insertion, which can effectively reduce the discomfort caused by repeated punctures and reduce the formation of wounds. After blood collection, the steel needle 4 and the mounting seat 9 are withdrawn simultaneously without affecting subsequent infusion and drug injection.
[0029] Example 2: Figure 1 , Figure 2 , Figure 3 and Figure 5 The technical solution shown addresses the issue of the catheter on the side easily wobbling during use, requiring separate fixation with a dressing. However, prolonged adhesion of the catheter to the skin with a dressing can cause skin discomfort. This integrated puncture mechanism for venous blood collection and indwelling needle insertion discloses a limiting mechanism. An elastic limiting band 11 is installed at the bottom of the three-way catheter holder 19, and limiting mechanisms to reduce catheter positional deviation are provided on both sides of the elastic limiting band 11. The limiting mechanism includes placement grooves 12, which are located on both sides of the elastic limiting band 11, with their positions corresponding to each other. A hook and loop fastener 13 is installed at the top of the placement groove 12 on one side of the elastic limiting band 11, and a hook and loop fastener 14 is installed at the bottom of the placement groove 12 on the other side of the elastic limiting band 11, with the hook and loop fastener 13 and hook and loop fastener 14 mutually compatible. The cross-section of the placement groove 12 is semi-circular, and the inner diameter of the placement groove 12 is larger than the diameter of the catheter.
[0030] In this example, the long catheter 20 on the side of the indwelling needle is used for infusion and drug injection. Therefore, it is necessary to fix the position of the long catheter 20 with dressings or medical tape during use. However, fixing the long catheter 20 to the skin surface for a long time can cause discomfort to the patient's skin. By using an elastic limiting band 11 to limit the position of the long catheter 20, and wrapping the elastic limiting band 11 around the wrist, the displacement of the long catheter 20 can be reduced while reducing skin discomfort. The long catheter 20 is then placed inside the placement slot 12. The arc-shaped groove of the groove 12 can fit against the outside of the long catheter 20, thereby restricting the position of the long catheter 20 and preventing the long catheter 20 from shifting. At the same time, the hook and loop fasteners 13 and 14 provided on the side of the groove 12 can fit together, thereby preventing the elastic limiting band 11 from becoming loose during use. Furthermore, the surface of the elastic limiting band 11 has multiple placement grooves 12, which can be used to place and fix the long catheter 20 in different placement grooves 12 according to the size of the patient's wrist.
[0031] Example 3: Figure 1 , Figure 2 , Figure 4 and Figure 5 The technical solution shown addresses the issue of blood backflow when the indwelling needle is not in use after insertion, as well as the problems inside the indwelling needle catheter. This integrated puncture mechanism for venous blood collection and indwelling needle insertion discloses a flow-stopping mechanism. A flow-stopping mechanism is fitted around the outside of the long catheter 20. The mechanism includes a flow-stopping clamp 15, which is fitted around the outside of the long catheter 20. Adjusting teeth 17 are slidably connected to both ends of the flow-stopping clamp 15, and limiting grooves 16 matching the adjusting teeth 17 are provided at both ends of the flow-stopping clamp 15. A pressing block 18 is fixedly connected to one side between the adjusting teeth 17. The pressing block 18 is located at the upper end of the long catheter 20, and the limiting grooves 16 are inclined at both ends of the flow-stopping clamp 15. Anti-slip blocks 3 are fixedly connected to both ends of the needle handle 2, and the anti-slip blocks 3 are evenly distributed on the surface of the needle handle 2.
[0032] In this example, after prolonged insertion of the indwelling needle, blood may flow back into the long catheter 20. Prolonged blood retention inside the long catheter 20 can cause blood clotting, leading to blockage of the indwelling needle. By rotating the adjusting tooth 17 towards the end near the heparin cap 6, the pressing block 18 is positioned downwards, allowing it to press against the long catheter 20 placed inside the stop clamp 15. When the adjusting tooth 17 moves to the side of the limiting groove 16, the pressing block 18 thoroughly presses against the stop clamp 15, effectively preventing blood backflow. During infusion, adjusting the position of the pressing block 18 can regulate the infusion rate, preventing patient discomfort caused by excessively rapid drug delivery.
[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An integrated puncture mechanism for venous blood collection and indwelling needle insertion, comprising a needle puncture protection cover (1), a needle handle (2) is installed on the side of the needle puncture protection cover (1), and a steel needle (4) is fixedly connected to the upper end of the needle puncture protection cover (1). A three-way catheter seat (19) is sleeved on the outside of the steel needle (4), and a sleeve (5) is installed on the upper end of the three-way catheter seat (19). A needle tube sheath (7) is sleeved on the outside of the sleeve (5). A long catheter (20) is installed on the side of the three-way catheter seat (19), and a heparin cap (6) is provided at one end of the long catheter (20). Its features are: The bottom end of the anti-needle puncture protective cover (1) is equipped with a connecting tube (8), and one end of the connecting tube (8) is provided with an auxiliary blood collection mechanism for blood collection. The auxiliary blood collection mechanism includes a mounting base (9), and the mounting base (9) is connected to the other end of the connecting tube (8). A tube plug puncture needle (10) is sleeved on the outside of the mounting base (9). The bottom end of the three-way conduit seat (19) is equipped with an elastic limiting band (11), and both sides of the elastic limiting band (11) are provided with limiting mechanisms to reduce the positional deviation of the conduit.
2. The integrated puncture mechanism for venous blood collection and indwelling needle insertion according to claim 1, characterized in that: The limiting mechanism includes a placement groove (12), and the placement groove (12) is opened on both sides of the elastic limiting band (11), and the positions of the placement groove (12) correspond to each other.
3. The integrated puncture mechanism for venous blood collection and indwelling needle insertion according to claim 2, characterized in that: The top of the placement groove (12) on one side of the elastic limiting band (11) is equipped with a hook and loop fastener (13), and the bottom of the placement groove (12) on the other side of the elastic limiting band (11) is equipped with a hook and loop fastener (14), and the hook and loop fastener (13) and the hook and loop fastener (14) are compatible with each other.
4. The integrated puncture mechanism for venous blood collection and indwelling needle insertion according to claim 3, characterized in that: The cross-section of the placement groove (12) is semi-circular, and the inner diameter of the placement groove (12) is larger than the diameter of the conduit.
5. The integrated puncture mechanism for venous blood collection and indwelling needle according to claim 1, characterized in that: The long conduit (20) is fitted with a flow-stopping mechanism, which includes a flow-stopping clamp (15). The flow-stopping clamp (15) is fitted on the outside of the long conduit (20). Both ends of the flow-stopping clamp (15) are slidably connected with adjusting teeth (17), and both ends of the flow-stopping clamp (15) are provided with limiting grooves (16) that match the adjusting teeth (17). A pressing block (18) is fixedly connected to one side between the adjusting teeth (17).
6. The integrated puncture mechanism for venous blood collection and indwelling needle according to claim 5, characterized in that: The pressing block (18) is located at the upper end of the long guide tube (20), and the limiting groove (16) is inclinedly located at both ends of the flow stop clamp (15).
7. The integrated puncture mechanism for venous blood collection and indwelling needle insertion according to claim 6, characterized in that: Both ends of the needle handle (2) are fixedly connected to anti-slip blocks (3), and the anti-slip blocks (3) are evenly distributed on the surface of the needle handle (2).