A sealed positive pressure needle-free medicine adding connector structure suitable for a remaining needle

Abstract

The application relates to a sealed positive pressure needle-free medicine adding connector structure suitable for a remaining needle and belonging to the technical field of medical devices, which comprises an infusion channel and a flow stop clamp, the infusion channel is communicated with a catheter seat and is used for conveying medicine liquid to the catheter seat; a remaining tube is communicated with the catheter seat, and the medicine liquid in the catheter seat can be conveyed to a patient's blood vessel through the remaining tube; the flow stop clamp is arranged on the infusion channel and is used for controlling the on-off of the infusion channel; the sealed positive pressure needle-free medicine adding connector structure further comprises a drum-shaped catheter, one end of the drum-shaped catheter is communicated with the infusion channel, and the other end of the drum-shaped catheter is detachably connected with a medicine liquid bottle loaded with the medicine liquid; the drum-shaped catheter can be elastically deformed in a recoverable shape through external force extrusion.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles. Background Technology

[0002] An indwelling catheter is a medical device that replaces traditional disposable infusion needles. Its purpose is to reduce pain from repeated punctures, minimize vascular damage, and significantly reduce the workload of medical staff. It is now widely used in clinical intravenous infusion, long-term drug administration, and emergency resuscitation. Structurally, an indwelling catheter typically consists of an indwelling catheter, a catheter hub, and an infusion access assembly. Specifically, the infusion access assembly includes an infusion tubing connected to the catheter hub and a stop-flow clamp attached to the tubing. In use, by connecting the bottled medication to the infusion tubing, the medication is delivered to the catheter hub and then through the indwelling catheter into the patient's blood vessel, enabling continuous and repeated infusion therapy.

[0003] However, in actual clinical practice, when the medication is about to be finished infused, medical staff usually use a clamp to close the infusion tubing, stopping the delivery of medication into the patient's blood vessels. At the moment the clamp closes, the tubing is compressed and deformed, reducing its volume and pushing any remaining medication forward into the indwelling catheter, thus preventing blood backflow for a short time. But when the clamp is reopened, the compressed tubing returns to its original shape, and the sudden increase in volume creates a momentary negative pressure inside the tubing. This can cause blood to be drawn back into the infusion tubing and indwelling catheter, resulting in blood backflow.

[0004] When a patient's blood flows back, blood cells in the blood can become trapped in the indwelling catheter. Once the indwelling catheter is blocked by blood cells, it will directly lead to obstruction or even complete interruption of the infusion route. This not only renders the indwelling needle ineffective but also requires the patient to be punctured again, increasing patient pain and the risk of vascular damage. At the same time, the blockage can easily cause complications such as local infection and phlebitis, significantly shortening the effective use time of the indwelling needle and greatly reducing the safety and reliability of clinical use. Summary of the Invention

[0005] To address the problem that the momentary negative pressure generated when the infusion tubing recovers its shape after the stop clamp is opened, leading to blood backflow, catheter blockage, and infusion interruption, requiring re-puncture, increasing patient pain and vascular damage, and easily causing infection and phlebitis, thus reducing the safety and lifespan of indwelling needles, this invention provides a sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles.

[0006] The objective of this invention can be achieved through the following technical solutions: A sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles includes an infusion passage and a flow stop clamp. The infusion passage is connected to the catheter seat and is used to deliver drug solution to the catheter seat. The flow stop clamp is disposed on the infusion passage and is used to control the opening and closing of the infusion passage. It also includes a drum-shaped catheter, one end of which is connected to the infusion passage, and the other end of which is detachably connected to a medicine bottle containing the medicine solution; the drum-shaped catheter can undergo elastic deformation that can recover its shape under external pressure.

[0007] As a preferred embodiment of the present invention, along the flow direction of the liquid medicine, the cross-sectional radius of the drum-shaped conduit first increases and then decreases, forming a structure that bulges in the middle and gradually narrows at both ends.

[0008] As a preferred embodiment of the present invention, the minimum diameter of the drum-shaped catheter is equal to the diameter of the infusion passage.

[0009] As a preferred embodiment of the present invention, the drum-shaped catheter is made of medical-grade silicone rubber.

[0010] As a preferred embodiment of the present invention, the drum-shaped conduit is provided with a plurality of elastic support rings inside, and the plurality of elastic support rings are evenly and uniformly arranged at equal intervals on the surface of the drum-shaped conduit along the setting direction of the drum-shaped conduit.

[0011] As a preferred embodiment of the present invention, it further includes a Luer connector, which is disposed at the end of the drum-shaped catheter away from the infusion passage, and the Luer connector enables quick insertion and removal connection with the medicine bottle.

[0012] As a preferred embodiment of the present invention, it further includes a hinge block, which is disposed within the infusion passage along the flow direction of the drug solution. The hinge block is located between the drum-shaped conduit and the flow stop clamp, and one end of the hinge block is hinged to the inner wall of the infusion passage.

[0013] As a preferred embodiment of the present invention, the cross-sectional shape of the hinge block is equal to the cross-sectional shape of the infusion passage.

[0014] The beneficial effects of this invention are as follows: This solution also includes a drum-shaped catheter. When medical staff reconnect the new medication bottle to the drum-shaped catheter, the medication in the bottle flows into the catheter. At this point, the medical staff squeezes the drum-shaped catheter, causing a sudden increase in hydraulic pressure in the infusion pathway connected to it. During this time, the medical staff reopens the stop clamp, reconnecting the infusion pathway to the indwelling catheter. As a result, the sudden increase in hydraulic pressure in the infusion pathway moves into the indwelling catheter, ultimately causing the medication in the indwelling catheter to move into the patient's blood vessel. This achieves the effect of directly delivering the medication in the infusion pathway into the patient's blood vessel even after the stop clamp is reopened. This solves the problem in traditional indwelling needle structures where the infusion tubing deforms and creates instantaneous negative pressure when the stop clamp is opened, leading to blood backflow, catheter blockage, and infusion interruption. This necessitates re-puncture, increasing patient pain and vascular damage, and is prone to infection and phlebitis, reducing the safety and lifespan of the indwelling needle. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a front view of a sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles according to the present invention; Figure 2 This is an internal cross-sectional view of the infusion pathway of a sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles according to the present invention.

[0017] Explanation of main symbols In the diagram: 1. Catheter seat; 2. Infusion passage; 3. Flow stop clamp; 4. Drum-shaped catheter; 5. Elastic support ring; 6. Luer connector; 7. Hinge block; 8. Restriction block. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0019] Please see Figures 1-2This embodiment provides a sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles, including an infusion passage 2 and a stop clamp 3. The infusion passage 2 is connected to a catheter seat 1 and is used to deliver medication to the catheter seat 1. The indwelling tube is connected to the catheter seat 1, and the medication located in the catheter seat 1 is delivered to the patient's blood vessel through the indwelling tube. The stop clamp 3 is set on the infusion passage 2 and is used to control the opening and closing of the infusion passage 2. It also includes a drum-shaped catheter 4, one end of which is connected to the infusion passage 2, and the other end of which is detachably connected to a medication bottle containing medication. The drum-shaped catheter 4 can undergo elastic deformation that can recover its shape under external pressure. It should be noted that in actual clinical operation, when the medication is about to be finished infusion, medical staff usually use the stop clamp 3 to close the infusion passage 2, so that the infusion passage 2 is in a closed state and the medication is stopped from being delivered to the patient's blood vessel. When the clamp 3 closes, the infusion passage 2 is compressed and deformed, reducing its lumen volume. This pushes the residual medication within the infusion passage 2 forward into the indwelling catheter, thus preventing blood backflow for a short period. However, when the clamp 3 reopens, the compressed infusion passage 2 returns to its original shape, and its lumen volume suddenly increases. This creates a momentary negative pressure inside the infusion passage 2, causing blood in the patient's blood vessels to be drawn back into the indwelling catheter, resulting in blood backflow. Based on this, in order to solve the above-mentioned problems, this solution also includes a drum-shaped catheter 4. When the medical staff reconnects the new medication bottle to the drum-shaped catheter 4, the medication in the medication bottle will flow into the drum-shaped catheter 4. At this time, the medical staff squeezes the drum-shaped catheter 4, causing a sudden increase in the hydraulic pressure of the infusion passage 2 connected to the drum-shaped catheter 4. During this period, the medical staff reopens the stop clamp 3, which reconnects the infusion passage 2 to the indwelling catheter. Therefore, the sudden increase in hydraulic pressure in the infusion passage 2 will move into the indwelling catheter, ultimately causing the medication in the indwelling catheter to move into the patient's blood vessel. This achieves the effect that after the medical staff reopens the stop clamp 3, the medication in the infusion passage 2 is still directly delivered into the patient's blood vessel. This solves the problem in the traditional indwelling needle structure where, when the stop clamp 3 is opened, the infusion tube deforms and generates instantaneous negative pressure, leading to blood backflow, indwelling catheter blockage, infusion interruption, the need for re-puncture, increased patient pain and vascular damage, easy infection and phlebitis, and reduced safety and lifespan of the indwelling needle.

[0020] Specifically, in this design, the cross-sectional radius of the drum-shaped catheter 4 first increases and then decreases along the flow direction of the medication, forming a structure that bulges in the middle and gradually narrows at both ends. First, this design makes it convenient for medical personnel to directly squeeze the drum-shaped catheter 4. Second, since the minimum diameter of the drum-shaped catheter 4 is equal to the diameter of the infusion passage 2, this setting ensures that there are no gaps or dead angles in the connection between the drum-shaped catheter 4 and the infusion passage 2, ensuring that the medication can move directly from the drum-shaped catheter 4 into the infusion passage 2.

[0021] Specifically, in order to ensure that the drum-shaped catheter 4 can recover its shape after being squeezed by medical personnel, the drum-shaped catheter 4 in this solution is made of medical-grade silicone rubber.

[0022] Furthermore, in order to improve the ability of the drum-shaped conduit 4 to recover its deformation, this solution also includes several elastic support rings 5, which are evenly and equally spaced on the surface of the drum-shaped conduit 4 along the setting direction of the drum-shaped conduit 4.

[0023] In addition, in order to connect the drum-shaped catheter 4 to the medicine bottle, this solution also includes a Luer connector 6. The Luer connector 6 is located at the end of the drum-shaped catheter 4 away from the infusion passage 2. By providing the Luer connector 6, the drum-shaped catheter 4 and the medicine bottle can be quickly plugged in and unplugged.

[0024] It should be noted that the drum-shaped catheter 4 in this design is made of elastically deformable medical material. When compressed and contracted by external force, its internal volume decreases. When the external force is removed and the drum-shaped catheter 4 recovers its deformation, the internal cavity volume of the drum-shaped catheter 4 gradually expands from the compressed small volume to the original large volume. The cavity space increases from small to large, which spontaneously creates a local negative pressure suction force inside the drum-shaped catheter 4. This negative pressure will be conducted along the infusion passage 2 towards the indwelling catheter side. On the one hand, it can easily prevent the flow of medication in the infusion passage 2 from flowing back to the drum-shaped catheter 4 side, making it difficult for the medication to be smoothly delivered to the indwelling catheter and the patient's blood vessels. On the other hand, when the negative pressure continues to be conducted towards the indwelling catheter, it can easily induce negative pressure backflow in the indwelling catheter, directly causing blood in the patient's blood vessels to flow back into the indwelling catheter and the infusion passage 2, thereby causing clinical problems such as catheter blockage, phlebitis, and the need for re-puncture. To structurally prevent the negative pressure generated by the rebound of the drum-shaped catheter 4 from spreading to the indwelling tube, this solution adds a hinge block 7 inside the infusion passage 2, along the direction of drug flow, between the drum-shaped catheter 4 and the stop clamp 3. One end of the hinge block 7 is hinged and fixed to the inner wall of the infusion passage 2, so that the hinge block 7 can freely deflect and rotate around the hinge point as the axis.

[0025] When the drum-shaped conduit 4 recovers its deformation and generates negative pressure, the negative pressure creates an adsorption and traction force on the fluid in the infusion passage 2, which acts on the hinge block 7, causing the hinge block 7 to deflect and swing towards the center of the infusion passage 2, with the hinge end on the inner wall as the fulcrum. As the hinge block 7 continues to rotate towards the center of the infusion passage 2, the flow gap between the hinge block 7 and the infusion passage 2 gradually narrows, thus reducing the effective flow cross-sectional area at the location of the hinge block 7. At this point, the narrowed gap forms a throttling damping and negative pressure barrier, essentially creating a fluid buffer barrier structure between the drum-shaped catheter 4 and the indwelling tube. The hinge block 7, through passive rotation, spontaneously reduces the flow gap, significantly weakening the conduction flux of the negative pressure generated by the rebound of the drum-shaped catheter 4 towards the indwelling tube, thus hindering the long-distance diffusion of negative pressure along the infusion pathway 2. Simultaneously, the reduced gap inhibits the backflow of medication into the drum-shaped catheter 4, locking the fluid pressure near the indwelling tube in the infusion pathway 2, preventing negative pressure traction from causing medication flow obstruction, and fundamentally eliminating the problem of poor medication delivery and blood reflux caused by the negative pressure from the deformation and rebound of the drum-shaped catheter 4.

[0026] Meanwhile, under normal infusion conditions, the drum-shaped catheter 4 has no obvious deformation or rebound, and there is no obvious negative pressure inside. The fluid thrust of the forward flow of the drug solution can slightly push the hinge block 7 open, so that the hinge block 7 and the inner wall of the passage maintain a large flow gap and do not hinder the normal and smooth flow of the drug solution. Only under the special condition that the drum-shaped catheter 4 generates rebound negative pressure, the hinge block 7 is passively deflected to narrow the gap and play a role in negative pressure isolation and protection, taking into account both the smoothness of normal infusion and the dual effect of negative pressure to prevent backflow.

[0027] Furthermore, the cross-sectional shape of the hinge block 7 is equal to the cross-sectional shape of the infusion passage 2. With this design, when the drum-shaped catheter 4 generates negative pressure, the hinge block 7 will rotate, thereby sealing the infusion passage 2 and preventing the negative pressure of the drum-shaped catheter 4 from affecting the medication in the infusion passage 2.

[0028] In addition, this solution also includes a limiting block 8, which is located inside the infusion passage 2. When the hinge block 7 seals the infusion passage 2, the end face of the hinge block 7 and the limiting block 8 are in a mating and fitting relationship, thus limiting the continued rotation of the hinge block 7.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles, characterized in that: It includes an infusion passage and a flow stop clamp. The infusion passage is connected to the catheter seat and is used to deliver medication to the catheter seat. The flow stop clamp is disposed on the infusion passage and is used to control the opening and closing of the infusion passage. It also includes a drum-shaped catheter, one end of which is connected to the infusion passage, and the other end of which is detachably connected to a medicine bottle containing the medicine solution; the drum-shaped catheter can undergo elastic deformation that can recover its shape under external pressure.

2. The sealed positive pressure needleless drug delivery connector structure for indwelling needles according to claim 1, characterized in that: Along the flow direction of the liquid medicine, the cross-sectional radius of the drum-shaped conduit first increases and then decreases, forming a structure that bulges in the middle and gradually narrows at both ends.

3. The sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles according to claim 1, characterized in that: The minimum diameter of the drum-shaped catheter is equal to the diameter of the infusion passage.

4. The sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles according to claim 1, characterized in that: The drum-shaped catheter is made of medical-grade silicone rubber.

5. The sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles according to claim 1, characterized in that: It also includes several elastic support rings, which are evenly and equidistantly arranged on the surface of the drum-shaped conduit along the setting direction of the drum-shaped conduit.

6. The sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles according to claim 1, characterized in that: It also includes a Luer connector, which is located at the end of the drum-shaped catheter away from the infusion passage, and the Luer connector enables quick insertion and removal connection with the medicine bottle.

7. The sealed positive pressure needleless drug delivery connector structure for indwelling needles according to claim 1, characterized in that: It also includes a hinge block, which is disposed in the infusion passage along the flow direction of the drug solution. The hinge block is located between the drum-shaped catheter and the flow stop clamp, and one end of the hinge block is hinged to the inner wall of the infusion passage.

8. A sealed positive pressure needleless drug delivery connector structure suitable for indwelling needles according to claim 7, characterized in that: The cross-sectional shape of the hinge block is equal to the cross-sectional shape of the infusion passage.

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