A puncture kit for central venous catheterization
By designing a puncture kit that includes a cannula, connecting tube, clamp, and screw, the problem of the lack of fixation device for central venous puncture needles is solved, the puncture success rate is improved, the operation is simplified, and patient suffering is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN ZHONGSHENG XIANGHE SANITARY MATERIALS CO LTD
- Filing Date
- 2025-02-28
- Publication Date
- 2026-07-17
AI Technical Summary
The lack of fixation devices in existing central venous puncture needles leads to poor guidewire insertion, reduces the success rate of puncture, and may cause patient pain and complications.
A puncture kit was designed, comprising a cannula, a central venous puncture needle, a connecting tube, a clamp, a guide rod, a spring, and a screw. The screw drives the ball to compress the clamp, achieving stable clamping and releasing of the puncture needle and improving the puncture success rate.
It improves the success rate of central venous puncture, simplifies the procedure, reduces patient suffering and the risk of complications, and is flexible and cost-effective.
Smart Images
Figure CN224505531U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a puncture kit for central venous catheterization. Background Technology
[0002] Central venous catheterization is a commonly used clinical technique for protecting veins and performing hemodynamic monitoring, intravenous infusion, and chemotherapy in critical and emergency situations. However, current central venous catheters lack proper fixation devices when they reach the correct position, leading to difficulties in guidewire insertion, reduced success rates, and repeated punctures that cause patient pain and complications. Utility Model Content
[0003] In view of the above situation and to overcome the defects of the existing technology, the purpose of this utility model is to provide a puncture kit for central venous catheterization, which effectively solves the problem of low puncture success rate.
[0004] The technical solution includes a cannula, a central venous puncture needle inserted inside the cannula, a connecting tube fixed to the tail end of the cannula, a first clamp block slidably connected above the central venous puncture needle inside the connecting tube, a second clamp block fixed below the central venous puncture needle inside the connecting tube, multiple guide rods evenly fixed on the upper surface of the second clamp block, the multiple guide rods being distributed on both sides of the central venous puncture needle, a spring sleeved on the guide rod, the spring being located between the first clamp block and the second clamp block, a screw threadedly connected to the connecting tube, the screw being parallel to the guide rod, a ball fixed at the bottom end of the screw inside the connecting tube, the ball contacting the upper surface of the first clamp block, and a knob fixed at the top end of the screw outside the connecting tube.
[0005] Preferably, the connecting tube is fixed with a connector that is perpendicular to the central venous puncture needle, and the connector is connected to the cannula needle via a tube.
[0006] Preferably, the outer surface of the knob is provided with anti-slip texture.
[0007] Preferably, the diameter of the sphere is not greater than the diameter of the screw.
[0008] Preferably, a limiting block is installed at the upper end of the guide rod above the first clamping block.
[0009] Preferably, both the first clamp and the second clamp are provided with an arc-shaped groove corresponding to the central venous puncture needle.
[0010] Preferably, the central venous puncture needle is fitted with a needle handle located outside the connecting tube.
[0011] This utility model has an ingenious structure. The screw drives the ball to squeeze the first clamping block while the position of the second clamping block remains unchanged. This achieves the clamping of the central venous puncture needle by the first and second clamping blocks, improving the success rate of puncture. Reversing the screw resets the spring, and the first clamping block moves away from the central venous puncture needle, thus releasing the needle. The structure is flexible, the operation is simple, the cost is low, and it is safe and reliable. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the front view of this utility model.
[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the connecting pipe, the first clamping block, and the second clamping block in this utility model.
[0014] Figure 3 This is a schematic diagram of the three-dimensional structure of the screw and ball in this utility model.
[0015] Reference numerals: 1. Cannula; 2. Central venous puncture needle; 3. Connecting tube; 4. First clamp; 5. Second clamp; 6. Guide rod; 7. Spring; 8. Screw; 9. Ball; 10. Knob; 11. Connector; 12. Limiting block; 13. Arc groove; 14. Needle handle. Detailed Implementation
[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0017] Depend on Figures 1 to 3 A puncture kit for central venous catheterization is provided, comprising a cannula 1, a central venous puncture needle 2 inserted inside the cannula 1, a connecting tube 3 fixed to the tail end of the cannula 1, a first clamp 4 slidably connected above the central venous puncture needle 2 inside the connecting tube 3, a second clamp 5 fixed below the central venous puncture needle 2 inside the connecting tube 3, a plurality of guide rods 6 evenly fixed on the upper surface of the second clamp 5, the plurality of guide rods 6 being distributed on both sides of the central venous puncture needle 2, a spring 7 sleeved on the guide rods 6, the spring 7 being located between the first clamp 4 and the second clamp 5, a screw 8 threadedly connected to the connecting tube 3, the screw 8 being parallel to the guide rods 6, a ball 9 fixed at the bottom end of the screw 8 inside the connecting tube 3, the ball 9 contacting the upper surface of the first clamp 4, and a knob 10 fixed at the top end of the screw 8 outside the connecting tube 3.
[0018] The connecting tube 3 is fixed with a connector 11 that is perpendicular to the central venous puncture needle 2. The connector 11 is connected to the cannula needle 1 via a pipe.
[0019] To facilitate the rotation of the knob 10, the outer surface of the knob 10 is provided with anti-slip texture.
[0020] To facilitate the insertion of the ball 9 into the connecting pipe 3 and to aid in installation, the diameter of the ball 9 is no greater than the diameter of the screw 8.
[0021] To prevent the guide rod 6 from detaching from the first clamping block 4, a limiting block 12 located above the first clamping block 4 is installed on the upper end of the guide rod 6.
[0022] To prevent damage to the central venous puncture needle 2 during the clamping process, both the first clamping block 4 and the second clamping block 5 are provided with arc-shaped grooves 13 corresponding to the central venous puncture needle 2.
[0023] The central venous puncture needle 2 is fitted with a needle handle 14 located outside the connecting tube 3.
[0024] In use, the connector 11 can be connected to devices such as syringes and infusion sets. Holding the needle handle 14, a suitable central venous puncture needle 2 is passed through the connecting tube 3 and inserted into the cannula 1. A gap exists between the first clamping block 4 and the central venous puncture needle 2. The arc-shaped groove 13 of the second clamping block 5 supports the lower half of the central venous puncture needle 2, maintaining its stability and facilitating its passage through the connecting tube 3. When the central venous puncture needle 2 reaches the appropriate docking position, the knob 10 is rotated. The knob 10 drives the screw 8 to spiral downwards on the connecting tube 3. The screw 8 drives the ball 9 to spiral downwards synchronously. The ball 9 then connects with the first... The small contact area of clamp 4 reduces friction between ball 9 and first clamp 4. Ball 9 rotates and presses down on first clamp 4, and first clamp 4 slides down in guide rod 6. Spring 7 is in a compressed state, and the position of second clamp 5 remains unchanged. Thus, first clamp 4 clamps and fixes central venous puncture needle 2. The threaded connection has self-locking properties, simple structure, flexible operation, and high stability. After the puncture process is completed, reverse knob 10, screw 8 drives ball 9 away from first clamp 4, and first clamp 4 resets under the action of spring 7. Central venous puncture needle 2 is removed, cannula 1 is left in the blood vessel, and then guide wire is inserted to improve the accuracy of guide wire insertion.
[0025] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.
Claims
1. A puncture kit for central venous catheterization, comprising a trocar (1) into which a central venous puncture needle (2) is inserted, and a connecting tube (3) fixed to the tail end of the trocar (1), characterized in that, The connecting tube (3) is slidably connected to a first clamp (4) located above the central venous puncture needle (2). The connecting tube (3) is fixed to a second clamp (5) located below the central venous puncture needle (2). Multiple guide rods (6) are evenly fixed on the upper surface of the second clamp (5). The multiple guide rods (6) are distributed on both sides of the central venous puncture needle (2). A spring (7) is sleeved on the guide rod (6). The spring (7) is located between the first clamp (4) and the second clamp (5). A screw (8) is threaded onto the connecting tube (3). The screw (8) is parallel to the guide rod (6). A ball (9) located inside the connecting tube (3) is fixed at the bottom end of the screw (8). The ball (9) is in contact with the upper surface of the first clamp (4). A knob (10) located outside the connecting tube (3) is fixed at the top end of the screw (8).
2. The puncture kit for central venous catheterization according to claim 1, wherein The connecting tube (3) is fixed with a connector (11) that is perpendicular to the central venous puncture needle (2). The connector (11) is connected to the cannula needle (1) through a pipe.
3. The puncture kit for central venous catheterization according to claim 1, wherein The outer surface of the knob (10) is provided with anti-slip texture.
4. The puncture kit for central venous catheterization according to claim 1, wherein The diameter of the sphere (9) is not greater than the diameter of the screw (8).
5. The puncture kit for central venous catheterization according to claim 1, wherein The guide rod (6) has a limiting block (12) installed at its upper end, which is located above the first clamping block (4).
6. The puncture kit for central venous catheterization according to claim 1, wherein Both the first clamp (4) and the second clamp (5) are provided with arc-shaped grooves (13) corresponding to the central venous puncture needle (2).
7. The puncture kit for central venous catheterization according to claim 1, wherein The central venous puncture needle (2) is fitted with a needle handle (14) located outside the connecting tube (3).