A venous indwelling needle

Abstract

The utility model provides a kind of intravenous indwelling needle, it is related to medical puncture instrument technical field, including needle tube, needle tube is sequentially provided with insertion part, taper transition part and main part along axial direction, the outer diameter of insertion part is less than the outer diameter of main part;Cannula, the cannula coaxial sleeve is set to the outer periphery of main part, and can be axially slid relative to main part, the cannula includes taper necking portion adjacent taper transition part and catheter portion connected to one end of taper necking portion, the outer diameter of taper necking portion gradually increases towards the side close to catheter portion. Through the structural design of needle tube and cannula, while ensuring sufficient blood flow, reduce puncture wound, improve puncture success rate, reduce the risk of complication, especially suitable for clinical application of senile patient, alleviate the pain of patient, improve nursing work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of medical puncture device technology, and more specifically, to an indwelling intravenous catheter. Background Technology

[0002] Indwelling intravenous catheters, a commonly used clinical infusion tool, provide continuous intravenous therapy by placing a soft catheter in a blood vessel, greatly reducing the pain of repeated punctures for patients and improving nursing efficiency. With the increasing aging of the population, the proportion of elderly patients in clinical treatment has significantly increased. However, due to physiological characteristics such as arteriosclerosis and muscle relaxation, elderly patients face many challenges in the clinical application of indwelling intravenous catheters.

[0003] When performing invasive continuous blood pressure monitoring in elderly patients, large-gauge indwelling needles (such as 20G or 18G) are typically required to ensure sufficient blood flow. However, large-gauge needles create larger wounds during puncture, and the decreased coagulation function in elderly patients makes hemostasis difficult, increasing the risk of complications such as bleeding and hematoma at the puncture site. While smaller-gauge needles reduce the puncture wound, their smaller outer diameter reduces rigidity, making them prone to bending when puncturing hardened blood vessels due to excessive resistance, thus affecting the success rate of puncture. Furthermore, the insufficient blood flow of smaller-gauge needles cannot meet the requirements of invasive continuous blood pressure monitoring, thereby affecting the accuracy and reliability of the monitoring results. Utility Model Content

[0004] The problem this invention addresses is: how to solve the technical problem that when patients use indwelling intravenous catheters, large-diameter indwelling needles cause large puncture wounds, make hemostasis difficult, and easily lead to complications, while small-diameter indwelling needles are prone to bending and have insufficient flow, affecting the accuracy of monitoring.

[0005] To solve the above problems, this utility model provides an indwelling intravenous needle, comprising:

[0006] A needle tube, wherein an insertion part, a tapered transition part and a main body part are sequentially arranged along the axial direction, and the outer diameter of the insertion part is smaller than the outer diameter of the main body part;

[0007] A sleeve is coaxially sleeved on the outer periphery of the main body and can slide axially relative to the main body. The sleeve includes a tapered constriction portion adjacent to the tapered transition portion and a guide portion connected to one end of the tapered constriction portion. The outer radial direction of the tapered constriction portion gradually increases on the side closer to the guide portion.

[0008] Optionally, the outer surface of the tapered transition portion and the outer surface of the tapered constriction portion are both formed as a smooth, continuous curved surface.

[0009] Optionally, the end of the insertion part is provided with a needle tip hole, which communicates with the inner cavity of the needle tube.

[0010] Optionally, a blood return window is provided on the side wall of the main body, and the blood return window communicates with the needle tip hole through the inner cavity of the needle tube.

[0011] Optionally, it further includes a first fixing seat and a second fixing seat; one end of the conduit portion away from the tapered constriction portion is disposed in the first fixing seat; the second fixing seat is slidably connected to one end of the first fixing seat, and one end of the main body portion away from the tapered transition portion extends out of the conduit portion and is disposed in the second fixing seat.

[0012] Optionally, the first fixing seat has an installation cavity extending axially through both ends; the installation cavity has a fixing sleeve, the fixing sleeve includes a conical sleeve head and a sleeve connected to one end of the conical sleeve head, the outer diameter of the conical sleeve head gradually increases axially from the end near the sleeve head to the end away from the sleeve head; the end of the guide tube portion away from the conical constriction portion is sleeved and fixed to the outer peripheral wall of the sleeve head, and the inner peripheral wall of the installation cavity has a groove, the end of the conical sleeve head away from the sleeve head is engaged in the groove.

[0013] Optionally, the second fixing seat is provided with a plug block, which is slidably inserted into the end of the mounting cavity away from the sleeve, and a needle holding handle is provided on the side wall of the second fixing seat.

[0014] Optionally, an isolation plug is provided in the mounting cavity between the plug-in block and the sleeve.

[0015] Optionally, the side wall of the first fixing seat is provided with an infusion bypass that communicates with the mounting cavity. An infusion tubing is inserted into the infusion bypass. The end of the infusion tubing away from the infusion bypass is connected to a connecting connector for connecting to an infusion tube or a sealing tube. A flow stop clamp is provided on the infusion tubing.

[0016] Optionally, a sheath is connected to the outer side of one end of the first fixing seat near the catheter portion, the sheath extending toward the insertion portion and covering the exposed needle and cannula.

[0017] This invention relates to an indwelling intravenous catheter where the outer diameter of the insertion portion of the needle tube is smaller than that of the main body. This reduces trauma to the blood vessel during puncture, lowers the difficulty of puncture, and is particularly suitable for patients with hardened blood vessels, such as elderly patients, reducing the risk of bleeding and hematoma caused by large puncture wounds. The tapered transition portion of the needle tube connects the insertion portion and the main body, allowing the needle tube to smoothly transition from a smaller outer diameter to a larger outer diameter. This guides the needle tube smoothly into the blood vessel during puncture while reducing friction and damage to the blood vessel wall. The main body of the needle tube provides sufficient rigidity and support, ensuring that the needle tube will not bend due to excessive resistance during puncture, guaranteeing the stability and success rate of the puncture. The tapered constriction of the cannula is adjacent to the tapered transition portion, facilitating its insertion into the blood vessel along with the needle tube, reducing skin resistance. Furthermore, when the cannula slides axially relative to the main body, the tapered constriction portion fits tightly with the tapered transition portion, forming a good seal and preventing blood from seeping out from the gap between the needle tube and the cannula. The catheter portion of the cannula is connected to one end of the tapered constriction section. After the indwelling needle is inserted into the blood vessel, the catheter portion remains inside the blood vessel for delivering medications, etc. Its inner diameter matches the outer diameter of the main body. The large-sized catheter portion ensures that the flow rate of the medication is large enough to meet the high flow rate requirements.

[0018] Therefore, the intravenous indwelling needle of this utility model, through the structural design of the needle tube and cannula, ensures sufficient blood flow while reducing the puncture wound, improving the puncture success rate, and reducing the risk of complications. It is especially suitable for clinical application in elderly patients, alleviating their pain and improving the efficiency of nursing work. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a syringe according to one embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the needle and cannula according to one embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0022] Figure 4 This is a cross-sectional structural diagram of one embodiment of the present utility model;

[0023] Figure 5 for Figure 4 A magnified structural diagram of point A in the middle.

[0024] Explanation of reference numerals in the attached figures:

[0025] 11. Needle tube; 12. Insertion part; 13. Needle tip hole; 14. Conical transition part; 15. Main body; 16. Blood return window; 2. Cannula; 27. Conical constriction part; 28. Catheter part; 39. First fixing seat; 30. Mounting cavity; 311. Slot; 32. Fixing sleeve; 321. Conical sleeve head; 322. Sleeve; 33. Isolation plug; 34. Infusion bypass; 4. Second fixing seat; 41. Insertion block; 42. Needle holder; 5. Infusion tubing; 51. Flow stop clamp; 6. Connecting connector; 7. Sheath. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0027] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0028] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0029] like Figure 1 , Figure 2As shown in the figure, an indwelling intravenous needle provided by this utility model includes a needle tube 1, which is provided with an insertion part 11, a tapered transition part 12 and a main body part 13 in sequence along the axial direction. The outer diameter of the insertion part 11 is smaller than the outer diameter of the main body part 13. A sleeve 2 is coaxially sleeved on the outer periphery of the main body part 13 and can slide axially relative to the main body part 13. The sleeve 2 includes a tapered constriction part 21 adjacent to the tapered transition part 12 and a catheter part 22 connected to one end of the tapered constriction part 21. The outer radial direction of the tapered constriction part 21 gradually increases on the side closer to the catheter part 22.

[0030] Specifically, the indwelling intravenous catheter mainly consists of a needle tube 1 and a cannula 2. The needle tube 1 is divided axially into an insertion section 11, a tapered transition section 12, and a main body 13. The outer diameter of the insertion section 11 is smaller than that of the main body 13, allowing the insertion section 11 to enter the blood vessel more smoothly during puncture, as its relatively smaller outer diameter reduces irritation and damage to the vessel wall, lowering the difficulty of puncture. The tapered transition section 12 smoothly connects the insertion section 11 and the main body 13, avoiding sharp bends at the connection point and preventing accidental damage to the blood vessel or surrounding tissues. The relatively large outer diameter of the main body 13 provides sufficient rigidity for the needle tube 1. When puncturing hardened blood vessels in elderly patients, the larger outer diameter better withstands resistance during puncture, reducing the possibility of needle tube 1 bending and improving the success rate of puncture. The cannula 2 is coaxially fitted around the outer periphery of the main body 13 and can slide axially relative to the main body 13. The cannula 2 includes a tapered constriction 21 and a catheter portion 22. The outer diameter of the tapered constriction 21 gradually increases towards the catheter portion 22. In actual use, after the insertion portion 11 of the needle 1 successfully punctures into the patient's blood vessel, medical personnel can slide the cannula 2 axially relative to the needle 1. Due to the special design of the tapered constriction 21, during sliding, the tapered constriction 21 gradually covers the tapered transition portion 12 and part of the main body 13 of the needle 1. As it slides, the gradually increasing outer diameter of the tapered constriction 21 gradually conforms to the blood vessel wall, providing a certain degree of fixation and sealing. Subsequently, the needle 1 can be partially or completely withdrawn from the blood vessel, while the catheter portion 22 of the cannula 2 remains in the blood vessel, thereby enabling continuous infusion therapy or other medical procedures requiring catheter placement, such as invasive continuous blood pressure monitoring for elderly patients.

[0031] In this embodiment, for elderly patients, due to their decreased coagulation function, the use of large-diameter indwelling needles results in larger wounds and difficulties in hemostasis, easily leading to complications such as bleeding and hematoma at the puncture site. The indwelling needle in this embodiment has a relatively small outer diameter of the insertion portion 11 of the needle tube 1, resulting in a smaller wound during puncture, reducing the possibility of bleeding, lowering the risk of complications due to decreased coagulation function, and improving the safety of using indwelling needles in elderly patients. Elderly patients often have arteriosclerosis, leading to greater resistance during puncture. While small-diameter indwelling needles create smaller puncture wounds, the lower rigidity of the needle tube 1 makes it prone to bending due to excessive resistance when puncturing arteriosclerotic vessels, affecting the success rate. In contrast, the small outer diameter of the insertion portion 11 of the needle tube 1 in this indwelling needle facilitates initial entry into the blood vessel, while the relatively larger outer diameter of the main body 13 ensures the overall rigidity of the needle tube 1. This allows for better overcoming of resistance when puncturing arteriosclerotic vessels, reducing the occurrence of bending and thus improving the success rate. When performing invasive continuous blood pressure monitoring and other treatments on elderly patients, sufficient blood flow must be ensured. This indwelling intravenous catheter, through its well-designed cannula 1, ensures a high success rate of puncture while reducing the risk of complications. The relatively large outer diameter of the main body 13 of the cannula 1 guarantees sufficient space for the catheter portion 22 inserted into the blood vessel, meeting the blood flow requirements for invasive continuous blood pressure monitoring and thus ensuring the accuracy and reliability of the monitoring results. Furthermore, the tapered constriction 21 of the cannula 2, as it slides relative to the cannula 1, gradually increases in outer diameter, allowing it to conform to the blood vessel wall and provide good fixation, preventing displacement of the indwelling needle within the blood vessel. It also provides a certain degree of sealing, reducing the risk of blood extravasation and the entry of external bacteria into the blood vessel. This helps maintain the stability and safety of the indwelling needle within the blood vessel, prolonging the indwelling time and improving nursing efficiency.

[0032] Optionally, such as Figure 1 , Figure 2 As shown, the outer surface of the tapered transition portion 12 and the outer surface of the tapered constriction portion 21 are both formed as a smooth transition continuous curved surface.

[0033] Specifically, during puncture using an indwelling intravenous catheter, the insertion portion 11 of the needle 1 first enters the patient's blood vessel. Subsequently, the cannula 2 slides axially relative to the needle 1, causing the tapered constriction portion 21 to gradually cover the tapered transition portion 12 of the needle 1 and move closer to the blood vessel wall. Because both the outer surfaces of the tapered transition portion 12 and the tapered constriction portion 21 are formed as smooth, continuous curved surfaces, no sharp edges or abrupt changes occur when these surfaces come into contact with the blood vessel wall or other surrounding tissues during the needle 1 punctures the blood vessel and the cannula 2 slides. During puncture, the needle 1 moves within the blood vessel; the continuous curved surface design makes the friction and collision between the needle 1 and the blood vessel wall more uniform, reducing damage to the blood vessel wall caused by localized stress concentration. During the sliding of the cannula 2, the continuous curved surface of the tapered constriction portion 21 contacts and gradually conforms to the blood vessel wall; its smooth transition avoids scraping or cutting of the blood vessel wall, allowing the cannula 2 to smoothly reach the predetermined position.

[0034] In this optional embodiment, the continuous curved surface makes the contact between the needle tube 1 and the cannula 2 and the blood vessel wall more gentle during operation, avoiding the scraping and cutting of the blood vessel wall by sharp edges, thereby reducing the risk of blood vessel damage and reducing complications caused by blood vessel damage, such as thrombosis and vascular inflammation, and improving the safety of indwelling needle use.

[0035] Optionally, such as Figure 1 As shown, the end of the insertion part 11 is provided with a needle tip hole 111, which is connected to the inner cavity of the needle tube 1.

[0036] Specifically, during the puncture of a blood vessel with an indwelling intravenous catheter, the insertion part 11 of the needle tube 1 first enters the patient's blood vessel. Since the end of the insertion part 11 has a needle tip hole 111, and the needle tip hole 111 communicates with the inner lumen of the needle tube 1, when medical personnel push the indwelling needle for puncture, blood flows from the needle tip hole 111 into the inner lumen of the needle tube 1 due to the pressure in the blood vessel. This process helps medical personnel visually determine whether the needle tube 1 has successfully punctured the blood vessel; that is, when blood is seen flowing back into the inner lumen of the needle tube 1, the puncture is confirmed to be successful. Furthermore, during subsequent procedures such as intravenous infusion therapy or invasive blood pressure monitoring, the infusion fluid or the blood sample required for monitoring can smoothly enter or exit the blood vessel through the communication channel between the inner lumen of the needle tube 1 and the needle tip hole 111, thus achieving the corresponding medical function.

[0037] In this optional embodiment, the communication between the needle tip orifice 111 and the inner lumen of the needle tube 1 allows for timely observation of blood return during the puncture process. Once blood return is observed, medical personnel can confirm that the needle tube 1 has accurately entered the blood vessel, avoiding blind puncture or incomplete puncture, greatly improving the accuracy of the puncture, and reducing the pain and additional damage to the patient caused by puncture failure. Furthermore, the communication between the needle tip orifice 111 and the inner lumen of the needle tube 1 is crucial to ensuring the smooth flow of liquid or blood samples.

[0038] Optionally, such as Figure 1 As shown, a blood return window 131 is provided on the side wall of the main body 13, and the blood return window 131 is connected to the needle tip hole 111 through the inner cavity of the needle tube 1.

[0039] Specifically, during the puncture of a blood vessel with an indwelling intravenous catheter, after the needle tip 111 of the insertion part 11 of the needle tube 1 enters the blood vessel, blood flows from the needle tip 111 into the inner lumen of the needle tube 1 due to the pressure inside the blood vessel. The blood return window 131 opened on the side wall of the main body 13 is connected to the needle tip 111 through the inner lumen of the needle tube 1, so blood flows along the inner lumen to the blood return window 131. When blood reaches the blood return window 131, medical staff can visually determine whether the needle tube 1 has been successfully punctured into the blood vessel by observing whether blood appears in the blood return window 131. Once the puncture is confirmed to be successful, medical staff can continue with subsequent operations, such as pushing the cannula 2, to complete the indwelling process of the indwelling needle.

[0040] In this optional embodiment, the blood return window 131 provides medical staff with a clearer and more intuitive basis for judging the success of the puncture. Compared with relying solely on the tip of the needle 1 to observe blood return, the blood return window 131 is located in the main body 13, making it easier for medical staff to observe. Especially in some special body positions or operating environments, it can more quickly and accurately determine whether the puncture was successful, reducing repeated punctures due to misjudgment and reducing patient discomfort. Furthermore, even if there is little blood return after the needle 1 is inserted into the blood vessel, the blood can still be observed more clearly through the blood return window 131, improving the accuracy of puncture judgment. This is especially suitable for elderly patients with thinner blood vessels and slower blood return.

[0041] Optionally, such as Figure 3 , Figure 4 As shown, it also includes a first fixing seat 3 and a second fixing seat 4; one end of the conduit portion 22 away from the tapered constriction portion 21 is disposed in the first fixing seat 3; the second fixing seat 4 is slidably connected to one end of the first fixing seat 3, and one end of the main body portion 13 away from the tapered transition portion 12 extends out of the conduit portion 22 and is disposed in the second fixing seat 4.

[0042] Specifically, the end of the catheter portion 22 furthest from the conical constriction portion 21 is fixedly disposed within the first fixing seat 3, providing a stable support and fixation point for the catheter portion 22, ensuring that the catheter portion 22 will not shake or shift during indwelling. The second fixing seat 4 is slidably connected to one end of the first fixing seat 3, and the end of the main body portion 13 furthest from the conical transition portion 12 extends out of the catheter portion 22 and is disposed within the second fixing seat 4. During the puncture operation, the needle tube 1 moves forward with the operation of the medical staff, causing the first fixing seat 3 and the second fixing seat 4 to move forward synchronously. After successful puncture, the second fixing seat 4 is moved relative to the first fixing seat 3, causing the second fixing seat 4 to move away from the first fixing seat 3, thereby causing the needle tube 1 to be removed from the cannula 2, completing the indwelling of the cannula 2.

[0043] In this optional embodiment, medical personnel can more easily control the relative positions of the needle 1 and the catheter portion 22 during puncture and placement. The sliding connection between the second fixing seat 4 and the first fixing seat 3 makes the insertion and removal of the needle 1 smoother, reducing the difficulty and complexity of the operation.

[0044] Optionally, such as Figure 4 , Figure 5 As shown, the first fixing seat 3 has an installation cavity 31 extending axially through both ends; the installation cavity 31 is provided with a fixing sleeve 32, which includes a conical sleeve head 321 and a sleeve 322 connected to one end of the conical sleeve head 321. The outer diameter of the conical sleeve head 321 gradually increases axially from the end near the sleeve 322 to the end away from the sleeve 322; the end of the guide tube 22 away from the conical constriction 21 is sleeved and fixed to the outer peripheral wall of the sleeve 322. The inner peripheral wall of the installation cavity 31 is provided with a groove 311, and the end of the conical sleeve head 321 away from the sleeve 322 is engaged in the groove 311.

[0045] Specifically, during the assembly of the intravenous catheter, the end of the catheter portion 22 away from the conical constriction portion 21 is sleeved and fixed to the outer peripheral wall of the sleeve 322 of the fixing sleeve 32. Through this sleeved connection, the catheter portion 22 and the fixing sleeve 32 form a preliminary connection. The outer diameter of the conical sleeve head 321 of the fixing sleeve 32 gradually increases axially from the end near the sleeve 322 to the end away from the sleeve 322. The first fixing seat 3 has an installation cavity 31 extending axially through both ends, and the inner peripheral wall of the installation cavity 31 has a groove 311. When the fixing sleeve 32 together with the catheter portion 22 is installed into the installation cavity 31 of the first fixing seat 3, due to the special shape of the conical sleeve head 321, the conical sleeve head 321 will be squeezed by the inner wall of the installation cavity 31 during the process of pushing it into the installation cavity 31, and gradually produce elastic deformation. When the end of the conical sleeve 321 away from the sleeve 322 reaches the position of the slot 311, the conical sleeve 321 recovers part of its elastic deformation and is engaged in the slot 311, thereby realizing a stable connection between the fixed sleeve 32 and the first fixed seat 3, and thus the guide tube 22 is stably fixed in the first fixed seat 3 through the fixed sleeve 32.

[0046] In this optional embodiment, the snap-fit ​​structure between the conical sleeve 321 and the slot 311, and the sleeve-fixed connection between the catheter portion 22 and the sleeve 322, provide reliable fixation for the catheter portion 22, preventing it from loosening or shifting within the first fixing seat 3. This ensures the stability of the indwelling needle's position within the blood vessel, reduces the risk of complications such as vascular injury and extravasation caused by needle displacement, and improves the safety of indwelling needle use. Furthermore, during the production and assembly process, it is only necessary to sleeve the catheter portion 22 onto the sleeve 322, and then push the fixing sleeve 32 along with the catheter portion 22 into the mounting cavity 31 of the first fixing seat 3. The elastic deformation of the conical sleeve 321 achieves snap-fit ​​with the slot 311, making the operation simple and convenient and improving production efficiency.

[0047] Optionally, such as Figure 5 As shown, the second fixing seat 4 is provided with a plug block 41, which is slidably plugged into the end of the mounting cavity 31 away from the sleeve 322. The side wall of the second fixing seat 4 is provided with a needle holder 42.

[0048] Specifically, during the puncture procedure, medical personnel operate the needle holder 42 to move the second fixation seat 4, which in turn moves the main body 13 (needle tube 1 part) associated with the second fixation seat 4 forward, thus realizing the puncture action of the needle tube 1. After the puncture is completed, when removing the needle tube 1, the second fixation seat 4 can be slid in the opposite direction by operating the needle holder 42, thus pulling the needle tube 1 out of the catheter part 22. The needle holder 42 is located on the side wall of the second fixation seat 4, providing medical personnel with a convenient grip and force application point. Medical personnel can control the movement of the second fixation seat 4 by gripping the needle holder 42, thereby realizing the insertion and removal of the needle tube 1, improving the convenience and accuracy of the operation.

[0049] In this optional embodiment, the needle handle 42 is easy for medical staff to grip, enabling better control of the puncture force and direction, reducing shaking and deviation during the puncture process, and improving the success rate of the puncture. At the same time, the sliding insertion structure makes the insertion and withdrawal of the needle tube 1 smoother, allowing medical staff to more accurately control the position and movement speed of the needle tube 1, reducing the risk of damage to the patient's blood vessels.

[0050] Optionally, such as Figure 5 As shown, an isolation plug 33 is provided in the mounting cavity 31 between the insertion block 41 and the sleeve 322.

[0051] Specifically, the isolating plug 33 is made of natural rubber or synthetic rubber. Natural rubber has good elasticity and flexibility, allowing it to fit tightly against the inner wall of the mounting cavity 31 and provide a reliable seal. Synthetic rubber, on the other hand, can have its properties adjusted according to specific needs, such as chemical corrosion resistance and aging resistance. For example, nitrile rubber has excellent oil resistance and abrasion resistance, making it suitable for indwelling needles that need to come into contact with special medications. By designing the outer diameter of the isolating plug 33 to be slightly larger than the inner diameter of the mounting cavity 31, the friction generated by compression fixes the isolating plug 33 within the mounting cavity 31. This connection method is simple and reliable, requiring no additional fixing device.

[0052] In this optional embodiment, the isolation plug 33 can effectively prevent blood, medication, or other liquids from leaking into the space between the insertion block 41 and the sleeve 322, preventing liquid seepage and contamination of surrounding tissues, reducing the risk of infection, and ensuring patient safety. Furthermore, the isolation plug 33 isolates the space between the needle 1 and the catheter section 22, preventing external bacteria, dust, and other contaminants from entering the indwelling needle and avoiding cross-contamination.

[0053] Optionally, such as Figure 3 , Figure 4As shown, the side wall of the first fixed base 3 is provided with an infusion bypass 34 that communicates with the mounting cavity 31. An infusion tubing 5 is inserted into the infusion bypass 34. The end of the infusion tubing 5 away from the infusion bypass 34 is connected to a connecting connector 6 for connecting to an infusion tube or a sealing tube. A flow stop clamp 51 is provided on the infusion tubing 5.

[0054] Specifically, the infusion bypass 34 is connected to the mounting cavity 31 of the first fixing seat 3. After the indwelling needle is punctured and placed in the blood vessel, the infusion tube or sealing tube is connected to the infusion tubing 5 through the connecting connector 6. The medication or sealing solution enters the connecting connector 6 from the infusion tube or sealing tube, then flows into the infusion bypass 34 through the infusion tubing 5, and then enters the catheter section 22 through the mounting cavity 31, finally being delivered to the patient's blood vessel to realize the infusion or sealing operation. The flow-stopping clamp 51 is provided on the infusion tubing 5, and medical staff can control the opening and closing of the infusion tubing 5 by operating the flow-stopping clamp 51. When it is necessary to stop the infusion or sealing, the flow-stopping clamp 51 is clamped to block the passage in the infusion tubing 5, and the medication or sealing solution stops flowing; when it is necessary to continue the infusion or sealing, the flow-stopping clamp 51 is released, the infusion tubing 5 is restored to patency, and the medication or sealing solution can flow normally.

[0055] In this optional embodiment, the connector 6 simplifies and facilitates the connection and replacement of the infusion tubing or sealing tubing, allowing medical staff to complete the operation quickly, reducing patient waiting time and minimizing discomfort caused by prolonged operation. Simultaneously, the stop clamp 51 allows medical staff to control the infusion flow at any time without complicated procedures, improving operational efficiency and convenience.

[0056] Optionally, such as Figure 3 , Figure 4 As shown, a sheath 7 is connected to the outer side of the first fixing seat 3 near the catheter part 22. The sheath 7 extends toward the insertion part 11 and covers the exposed needle tube 1 and sheath 2.

[0057] Specifically, during storage, the needle tube 1 and cannula 2, which were originally exposed, are covered by a sheath 7. The sheath 7 changes the contact state between the needle tube 1 and cannula 2 and the external environment, playing a certain role in isolation and protection. It can prevent external objects, dust, bacteria, etc. from directly contacting the needle tube 1 and cannula 2, reducing the risk of infection. At the same time, it can also prevent the needle tube 1 and cannula 2 from being damaged by accidental collisions or friction, ensuring the normal use of the indwelling needle.

[0058] In this optional embodiment, the sheath 7 covers the exposed needle 1 and cannula 2, effectively preventing the invasion of external bacteria, viruses, and other microorganisms, reducing the probability of indwelling needle-related infections, protecting the patient's health, reducing the risk of complications caused by infection, and improving treatment efficacy. The sheath 7 can prevent the needle 1 and cannula 2 from directly colliding or rubbing against surrounding objects, preventing the needle 1 from bending, breaking, or the cannula 2 from being damaged.

[0059] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A type of indwelling intravenous needle, characterized in that, include: The needle tube (1) is provided with an insertion part (11), a tapered transition part (12) and a main body part (13) in sequence along the axial direction. The outer diameter of the insertion part (11) is smaller than the outer diameter of the main body part (13). The sleeve (2) is coaxially sleeved on the outer periphery of the main body (13) and can slide axially relative to the main body (13). The sleeve (2) includes a tapered constriction (21) adjacent to the tapered transition portion (12) and a conduit portion (22) connected to one end of the tapered constriction (21). The outer radial direction of the tapered constriction (21) gradually increases on the side closer to the conduit portion (22).

2. The indwelling intravenous needle according to claim 1, characterized in that, The outer surfaces of the tapered transition portion (12) and the tapered constriction portion (21) are both formed as smooth, continuous curved surfaces.

3. The indwelling intravenous needle according to claim 1, characterized in that, The insertion part (11) has a needle tip hole (111) at its end, and the needle tip hole (111) is connected to the inner cavity of the needle tube (1).

4. The indwelling intravenous needle according to claim 3, characterized in that, A blood return window (131) is provided on the side wall of the main body (13), and the blood return window (131) is connected to the needle tip hole (111) through the inner cavity of the needle tube (1).

5. The indwelling intravenous needle according to any one of claims 1-4, characterized in that, It also includes a first fixing seat (3) and a second fixing seat (4); the end of the conduit portion (22) away from the conical constriction portion (21) is disposed in the first fixing seat (3); the second fixing seat (4) is slidably connected to one end of the first fixing seat (3), and the end of the main body portion (13) away from the conical transition portion (12) extends out of the conduit portion (22) and is disposed in the second fixing seat (4).

6. The indwelling intravenous needle according to claim 5, characterized in that, The first fixing seat (3) is provided with an installation cavity (31) extending axially through both ends of the first fixing seat (3); the installation cavity (31) is provided with a fixing sleeve (32), the fixing sleeve (32) includes a conical sleeve head (321) and a sleeve (322) connected to one end of the conical sleeve head (321). The outer diameter of the conical sleeve head (321) gradually increases axially from the end near the sleeve (322) to the end away from the sleeve (322). The end of the guide tube (22) away from the conical constriction part (21) is sleeved and fixed to the outer peripheral wall of the sleeve (322). The inner peripheral wall of the installation cavity (31) is provided with a groove (311), and the end of the conical sleeve head (321) away from the sleeve (322) is engaged in the groove (311).

7. The indwelling intravenous needle according to claim 6, characterized in that, The second fixing seat (4) is provided with a plug-in block (41), which is slidably inserted into the end of the mounting cavity (31) away from the sleeve (322). The side wall of the second fixing seat (4) is provided with a needle holder (42).

8. The indwelling intravenous needle according to claim 7, characterized in that, An isolation plug (33) is provided in the mounting cavity (31) between the plug block (41) and the sleeve (322).

9. The indwelling intravenous needle according to claim 6, characterized in that, The first fixed base (3) has an infusion bypass (34) communicating with the mounting cavity (31) on its side wall. An infusion tubing (5) is inserted into the infusion bypass (34). A connecting connector (6) is connected to one end of the infusion tubing (5) away from the infusion bypass (34) for connecting to an infusion tube or a sealing tube. A flow stop clamp (51) is provided on the infusion tubing (5).

10. The indwelling intravenous needle according to claim 5, characterized in that, The first fixing seat (3) is connected to a sheath (7) on the outer side of one end near the catheter part (22). The sheath (7) extends toward the insertion part (11) and covers the exposed needle (1) and the sleeve (2).

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