Arterial puncture cannulation needle

Abstract

This utility model relates to the field of medical consumables technology and provides an arterial puncture catheterization needle, including a puncture needle and a needle core. The puncture needle includes a needle sheath and a needle tip that fixes the front end of the needle sheath. A central tube is located inside the needle sheath. One end of the needle core has a positioning sleeve, and a positioning core is located at the center of the positioning sleeve. The end face of the positioning sleeve matches the gap between the central tube and the needle sheath. The diameter of the positioning core matches the inner diameter of the central tube. First wing blocks are located on both sides of the outer periphery of the needle sheath, and corresponding second wing blocks are located on both sides of the outer periphery of the needle core. The first wing blocks have through holes, and the second wing blocks have corresponding insertion rods. The positioning core, central tube, positioning sleeve, and needle sheath are in adjacent contact, increasing the contact area and ensuring the stability of the insertion. Furthermore, both the puncture needle and the needle core have wing blocks, and the two sets of wing blocks are also connected through through holes and insertion rods, further improving the stability of the insertion. At the same time, the symmetrical arrangement of the wing blocks facilitates the doctor's handheld puncture operation.

Description

Technical Field

[0001] This utility model belongs to the field of medical consumables technology, and in particular relates to an arterial puncture catheterization needle. Background Technology

[0002] Arterial catheterization is a medical tool used to establish arterial access, primarily for continuous monitoring of arterial blood pressure, frequent collection of arterial blood samples (such as blood gas analysis), or special treatments (such as blood purification).

[0003] Arterial puncture and catheterization typically employs the Seldinger technique, the principle and steps of which are as follows:

[0004] Artery puncture: A puncture needle with a core is used to penetrate the skin and arterial wall to enter the arterial lumen (see blood return).

[0005] Guidewire insertion: Remove the needle core and insert the soft guidewire into the artery through the hollow puncture needle.

[0006] Withdraw the puncture needle: Leave the guidewire in the artery and withdraw the puncture needle.

[0007] Insert the catheter along the guidewire: Push the catheter along the guidewire into the artery, and finally withdraw the guidewire, leaving the catheter in the artery.

[0008] Connection tubing: The catheter tip is connected to a pressure sensor or heparinized flushing device for continuous blood pressure monitoring or to prevent thrombosis.

[0009] Before the above procedure, the needle core is directly inserted into the puncture needle. Then, the doctor carefully inserts the needle tip into the artery until fresh blood flows from the tip of the needle core, indicating that the insertion is complete. Because it is directly inserted into the cavity of the puncture needle, the needle core is prone to loosening from the puncture needle during the overall insertion process, affecting subsequent procedures. Furthermore, the cylindrical handle of the puncture needle is inconvenient for the doctor to hold and manipulate. Utility Model Content

[0010] In view of the above problems, the purpose of this utility model is to provide an arterial puncture catheterization needle, which aims to solve the technical problems of unstable connection and inconvenient operation of existing arterial puncture catheterization needles.

[0011] The present invention adopts the following technical solution:

[0012] The arterial puncture catheterization needle includes a puncture needle and a needle core. The puncture needle includes a needle sheath and a needle tip that fixes the front end of the needle sheath. The needle sheath contains a central tube. One end of the needle core has a positioning sleeve. The positioning sleeve has a positioning core at its center. The end face of the positioning sleeve matches the gap between the central tube and the needle sheath. The diameter of the positioning core matches the inner diameter of the central tube. The needle sheath has first wing blocks on both sides of its outer periphery, and the needle core has corresponding second wing blocks on both sides of its outer periphery. The first wing blocks have through holes, and the second wing blocks have corresponding insertion rods.

[0013] Furthermore, the central tube protrudes from the end face of the needle sleeve, and the gap depth between the positioning core and the positioning sleeve matches the length of the central tube.

[0014] Furthermore, the positioning core has an inner needle tube at its center. After the puncture needle and needle core are inserted, the inner needle tube is inserted into the needle head, and the outer diameter of the inner needle tube matches the inner diameter of the needle head.

[0015] Furthermore, the top of the needle core has an extension tube, and the center of the positioning core has a guide hole that communicates directly with the extension tube, and the guide hole is connected to the inner needle tube.

[0016] Furthermore, the front end of the needle sheath also has a fixing sleeve, the needle is fixed to the front end of the fixing sleeve, the bottom surface of the inner cavity of the fixing sleeve is a conical surface, and the diameter of the fixing sleeve is smaller than the diameter of the needle sheath.

[0017] Furthermore, the surfaces of the needle core and needle sleeve have friction strips.

[0018] The beneficial effects of this utility model are as follows: This utility model improves the structural design of the puncture needle and the needle core. The needle sheath of the puncture needle includes a central tube, and the needle core is designed with a positioning sleeve and a positioning core. After the needle core is inserted into the needle sheath, the positioning core, the central tube, the positioning sleeve, and the needle sheath are in adjacent contact, which increases the contact area and ensures the stability of the insertion. There is no need to design a locking structure, which makes it easy to remove the needle core directly. On the other hand, both the puncture needle and the needle core have wing blocks. The two sets of wing blocks are also connected by perforations and insertion rods, which further improves the stability of the insertion. At the same time, the wing blocks are symmetrical from left to right, which also facilitates the doctor's hand-held puncture operation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional arterial puncture catheterization needle provided in this embodiment of the utility model. Figure 1 ;

[0020] Figure 2 This is a three-dimensional arterial puncture catheterization needle provided in this embodiment of the utility model. Figure 2 ;

[0021] Figure 3 This is a cross-sectional view of the arterial puncture catheterization needle provided in this embodiment of the present invention;

[0022] Figure 4 yes Figure 3 A magnified view of a portion of the image. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0025] like Figure 1-4 As shown, the arterial puncture catheterization needle provided in this embodiment includes a puncture needle 1 and a needle core 2. The puncture needle 1 includes a needle sleeve 3 and a needle tip 4 that fixes the front end of the needle sleeve. The needle sleeve 3 contains a central tube 31. One end of the needle core 2 has a positioning sleeve 21. The center of the positioning sleeve 21 has a positioning core 22. The end face of the positioning sleeve 21 matches the gap between the central tube 31 and the needle sleeve 3. The diameter of the positioning core 22 matches the inner diameter of the central tube 31. The needle sleeve 3 has first wing blocks 32 on both sides of its outer periphery, and the needle core 2 has corresponding second wing blocks 23 on both sides of its outer periphery. The first wing block 32 has a through hole 33, and the second wing block 23 has a corresponding insertion rod 24.

[0026] In the initial product packaging, the needle core is inserted into the needle sheath of the puncture needle. In this embodiment, the two are directly connected by a plug-in method, without the need for a locking structure, making the insertion and removal of the needle core simple. Compared to the plug-in method of existing products, in this structure, the needle sheath of the puncture needle includes a central tube, and the needle core is designed with a positioning sleeve and a positioning core. After the needle core is inserted into the needle sheath, the positioning core, central tube, positioning sleeve, and needle sheath are in adjacent contact, increasing the contact area and ensuring the stability of the insertion.

[0027] Specifically, such as Figure 4 As shown, after the needle core is inserted, the positioning core 22 is located inside the central tube 31, which in turn is located inside the positioning sleeve 21, which is in turn located inside the needle sheath 3. This creates multiple contact surfaces. By adjusting the dimensional fit, the needle core can be stably inserted and assembled into the needle sheath. Both the puncture needle and the needle core have wing blocks, which are relatively thick. The two sets of wing blocks are connected via perforations and insertion rods, further improving the stability of the connection. The symmetrical arrangement of the wing blocks also facilitates the doctor's hand-held puncture operation. During the puncture operation, the two sets of wing blocks can be assembled into a single unit. The doctor can hold the wing block portion and insert it obliquely downwards into the patient's artery. The thickness of the wing blocks also improves the doctor's grip. Furthermore, as shown in the illustration, the surfaces of the needle core 2 and the needle sheath 3 have friction strips 6, further increasing the friction with the hand and facilitating operation.

[0028] Moreover, when removing the needle core, you can hold the two sets of wing blocks with your left and right hands respectively, and pull out the needle core directly, which is relatively simple to operate.

[0029] When needle 4 is inserted, since needle 4 is internally connected to the positioning core 22, if the puncture is complete, a certain amount of blood will enter the positioning core from the needle and finally leak out from the top of the positioning core, i.e., bleeding. As a specific structural feature, the positioning core 22 has an inner needle tube 25 at its center. After the puncture needle and needle core are inserted, the inner needle tube 25 is inserted into the needle 4, and the outer diameter of the inner needle tube 25 matches the inner diameter of the needle 4. The top of the needle core 2 also has an extension tube 5, and the center of the positioning core 22 has a guide hole 26 that communicates directly with the extension tube 5. The guide hole 26 communicates with the inner needle tube 25. Because the inner needle tube is inserted into the needle, the blood in the needle can flow into the inner needle tube along the needle, then be guided to the guide hole 26 in the needle core, and finally drain out from the extension tube 5. The extension tube can be connected to a thin flexible tube to drain the blood to other locations, preventing blood from dripping onto the doctor's hands and increasing the risk of contamination. The purpose of setting up the inner needle tube is to facilitate blood entering the needle core.

[0030] Furthermore, the front end of the needle sheath 3 also has a fixing sleeve 34, to which the needle 4 is fixed. The bottom surface of the inner cavity of the fixing sleeve 34 is a conical surface 35, and the diameter of the fixing sleeve 34 is smaller than the diameter of the needle sheath 3. As mentioned in the background, after puncture, the needle core must first be removed, then the guidewire is inserted into the puncture needle and advanced into the artery along the needle tip. Finally, the puncture needle is withdrawn, leaving the guidewire in the artery, and the catheter is inserted along the guidewire. The function of the conical surface 35 is to facilitate the guidewire's entry into the needle tip (the needle tip has a sufficient inner diameter to facilitate guidewire insertion) and prevent it from getting stuck at the needle tip end.

[0031] Finally, as shown in the diagram, the central tube 31 protrudes from the end face of the needle sleeve 3. The gap depth between the positioning core 22 and the positioning sleeve 21 matches the length of the central tube 31, which further increases the contact area and improves insertion stability. In addition, during the insertion of the guidewire, a small amount of blood may leak out. By lengthening the central tube, blood can be prevented from flowing into the gap between the central tube and the needle sleeve as much as possible.

[0032] 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 and improvements 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. An arterial puncture catheterization needle, comprising a puncture needle and a needle core, characterized in that, The puncture needle includes a needle sheath and a needle tip that fixes the front end of the needle sheath. The needle sheath contains a central tube, and one end of the needle core has a positioning sleeve. The positioning sleeve has a positioning core at its center. The end face of the positioning sleeve matches the gap between the central tube and the needle sheath. The diameter of the positioning core matches the inner diameter of the central tube. The needle sheath has first wing blocks on both sides of its outer periphery, and the needle core has corresponding second wing blocks on both sides of its outer periphery. The first wing blocks have through holes, and the second wing blocks have corresponding insertion rods.

2. The arterial puncture catheterization needle as described in claim 1, characterized in that, The central tube protrudes from the end face of the needle sleeve, and the gap depth between the positioning core and the positioning sleeve matches the length of the central tube.

3. The arterial puncture catheterization needle as described in claim 2, characterized in that, The positioning core has an inner needle tube at its center. After the puncture needle and needle core are inserted, the inner needle tube is inserted into the needle head, and the outer diameter of the inner needle tube matches the inner diameter of the needle head.

4. The arterial puncture catheterization needle as described in claim 3, characterized in that, The top of the needle core also has an extension tube, and the center of the positioning core has a guide hole that communicates directly with the extension tube, and the guide hole is connected to the inner needle tube.

5. The arterial puncture catheterization needle as described in claim 4, characterized in that, The needle sheath also has a fixing sleeve at its front end, and the needle is fixed to the front end of the fixing sleeve. The bottom surface of the inner cavity of the fixing sleeve is a conical surface, and the diameter of the fixing sleeve is smaller than the diameter of the needle sheath.

6. The arterial puncture catheterization needle as described in claim 5, characterized in that, The surfaces of the needle core and needle sheath have friction strips.

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