High-pressure-resistant multi-cavity anti-reflux central venous catheter for critical emergency treatment

Abstract

The invention discloses a high-pressure-resistant multi-cavity anti-reflux central venous catheter for critical emergency treatment, and relates to the technical field of medical instruments, the high-pressure-resistant multi-cavity anti-reflux central venous catheter comprises a connecting seat, one end of the connecting seat is communicated with a catheter, the other end of the connecting seat is communicated with a main tube and a branch tube, and the main tube and the branch tube are both communicated with the catheter; the liquid stopping assembly is installed in the end, away from the connecting base, of the guide pipe; the connector is installed at the ends, away from the connecting base, of the main pipe and the branch pipe and used for being connected with external infusion equipment. By operating the in-vitro control part, the liquid stopping bag body in the catheter can be instantaneously expanded, an infusion cavity is blocked from the inside, the blocking point is close to the heart, the pressure stabilizing time is greatly shortened, the central venous pressure is measured more quickly, and the reading is more accurate.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically a high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care. Background Technology

[0002] Central venous catheters are key devices for intensive care, rapid infusion, long-term chemotherapy, and central venous pressure monitoring. Current central venous catheters typically consist of an inserted catheter segment and an external proximal connector with multiple branch tubes and connectors to enable multi-path infusion.

[0003] However, existing central venous catheters face several challenges in clinical application: First, when central venous pressure monitoring is required, the regulating valve on the external infusion line must be closed. This occlusion point is far from the heart, and the compliance of the tubing and the inertia of the fluid column can lead to slow pressure reading response and reduced accuracy. Second, blood reflux at the catheter tip can easily cause thrombotic blockage of the lumen. In addition, most catheter chambers have a single function, making it difficult to simultaneously meet the needs of rapid high-pressure infusion and multi-drug combination therapy.

[0004] To address the above problems, this invention provides a high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care, thereby solving the aforementioned issues. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care, comprising: A connector, one end of which is connected to a conduit, and the other end of which is connected to a main pipe and a branch pipe, and both the main pipe and the branch pipe are connected to the conduit; The liquid-stopping assembly is installed inside the end of the conduit away from the connector. A connector is installed at the end of the main pipe and branch pipe away from the connector seat for connection to an external infusion device.

[0006] Furthermore, preferably, the catheter has two independent chambers inside, including a main infusion chamber and at least one auxiliary infusion chamber, and the catheter is made of medical-grade polyurethane.

[0007] Furthermore, preferably, a three-way valve is installed inside the end of the main infusion chamber and the auxiliary infusion chamber away from the connecting seat. The three-way valve includes three leaflets, and the center of the three leaflets intersects to form a closed line. It is configured to open outward under positive fluid pressure, automatically close under no pressure, and open inward under external negative pressure.

[0008] Furthermore, preferably, the compressive strength of the outer wall of the catheter is greater than the compressive strength of the main infusion cavity and the auxiliary infusion cavity.

[0009] Further, preferably, the liquid-stopping component includes: A cavity is formed inside the conduit; Two sealing components are configured and installed inside the cavity, respectively fitted onto the outer walls of the main infusion cavity and the auxiliary infusion cavity; The inlet pipe is fixed inside the conduit and is connected to the sealing assembly by multiple branch pipes; A normally closed capsule is fitted onto the outer wall of the inlet tube and is fixedly connected to the conduit.

[0010] Further, preferably, the enclosure component includes: Two liquid-stopping bladders are configured and symmetrically fixed within the cavity; A sealing plate is fixed on one side of the two liquid-stopping bladders that are close to each other, and the width of the sealing plate is greater than the diameter of the main infusion chamber and the auxiliary infusion chamber. Multiple limiting balls are configured and fixed on one side of the two closed plates that are close to each other, and do not contact the main infusion chamber and the auxiliary infusion chamber.

[0011] Furthermore, preferably, the stop-fluid balloon includes a closure section and a transfer section, the closure section being sleeved with the main infusion chamber and the auxiliary infusion chamber, the transfer section communicating with the closure section, and one end of the transfer section exposing the catheter.

[0012] Furthermore, preferably, the initial state of the normally closed cyst is to squeeze the inlet tube to close it.

[0013] Furthermore, preferably, the initial state of the stop-fluid bladder is that the inner wall of the closed segment slightly compresses the main infusion chamber and the auxiliary infusion chamber, and at this time the internal liquid pressure is lower than the internal liquid pressure of the normally closed bladder.

[0014] Furthermore, preferably, the liquid filling the inside of the stop-fluid sac and the normally closed sac is sterile physiological saline.

[0015] Compared with the prior art, the present invention provides a high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care, which has the following beneficial effects: 1. By operating the external control components, the stop-fluid balloon inside the catheter can be expanded instantly, blocking the infusion lumen from the inside. This blocking point is close to the heart, which greatly shortens the pressure stabilization time, making central venous pressure measurement faster and reading more accurate.

[0016] 2. The liquid-stopping assembly maintains the initial compression closure of the inlet tube through the normally closed bladder, and forms a stable self-locking system by setting the pressure difference between the liquid-stopping bladder and the normally closed bladder. The system only unlocks and allows liquid to flow into the liquid-stopping bladder to complete the blockage when external pressure is applied to the normally closed bladder.

[0017] 3. The stop-fluid component is driven by an independent fluid circuit and is completely isolated from the main infusion pathway. The driving fluid is sterile saline. Even if the capsule ruptures in a very small probability, there is no safety risk if a small amount of saline enters the blood circulation, and the infusion function of the catheter core is not affected.

[0018] 4. The catheter has a high-pressure resistant main infusion chamber and an independent auxiliary infusion chamber, which can simultaneously perform rapid infusion (or high-pressure angiography) and continuous drug administration. The three-way valve at the end can effectively prevent blood backflow and reduce the risk of catheter blockage. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a high-pressure resistant, multi-lumen anti-reflux central venous catheter for critical care; Figure 2 A schematic diagram of the radial cross-sectional structure of a high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care; Figure 3 for Figure 2 Schematic diagram of section AA; Figure 4 A schematic diagram of the three-way valve status of a high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care; Figure 5 for Figure 2 Schematic diagram of the BB section; Figure 6 This is a schematic diagram showing the measurement status of a high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care. In the diagram: 1. Connector; 2. Catheter; 3. Stopping assembly; 4. Main tube; 5. Branch tube; 6. Connector; 31. Main infusion chamber; 32. Auxiliary infusion chamber; 33. Three-way valve; 34. Closure assembly; 35. Inlet tube; 36. Normally closed bladder; 37. Cavity; 38. Branch tube; 341. Stopping bladder; 342. Closure segment; 343. Transfer segment; 344. Closure plate; 345. Limiting ball. Detailed Implementation

[0020] Reference Figures 1-6 This invention provides a technical solution: a high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care, comprising: The connecting seat 1 has a conduit 2 connected to one end and a main pipe 4 and a branch pipe 5 connected to the other end, and both the main pipe 4 and the branch pipe 5 are connected to the conduit 2. The liquid-stopping component 3 is installed inside the end of the conduit 2 away from the connector 1; The connector 6 is installed at the end of the main pipe 4 and the branch pipe 5 away from the connector seat 1, and is used to connect to an external infusion device.

[0021] It should be noted that the catheter 2 is provided with graduations.

[0022] In this embodiment, the catheter 2 has two independent chambers inside, including a main infusion chamber 31 and at least one auxiliary infusion chamber 32, and the catheter 2 is made of medical-grade polyurethane.

[0023] It is important to note that catheter 2 is made of medical-grade polyurethane material, which has good biocompatibility, flexibility and high pressure resistance. It has two independent and parallel chambers co-extruded internally: a main infusion chamber 31 with a larger cross-sectional area and an auxiliary infusion chamber 32 with a smaller cross-sectional area. The wall of the main infusion chamber 31 is reinforced with materials and can withstand pressures greater than 300 psi, making it suitable for rapid infusion in critical care or high-pressure contrast agent injection. The auxiliary infusion chamber 32 is used for routine infusion, nutritional support or chemotherapy drug infusion to achieve combined treatment.

[0024] Preferably, a three-way valve 33 is installed inside the end of the main infusion chamber 31 and the auxiliary infusion chamber 32 away from the connecting seat 1. The three-way valve 33 includes three leaflets, and the center of the three leaflets intersects to form a closed line. It is configured to open outward under positive fluid pressure, close automatically in the absence of pressure, and open inward under external negative pressure.

[0025] In other words, when no fluid is injected, the three-way valve 33 is in a closed state, such as... Figure 4 As shown in Figure a, when fluid is injected, the three-way valve 33 is in the outward-opening state, as... Figure 4 As shown in Figure b, when blood is drawn, the three-way valve 33 is in the inward-opening state, as... Figure 4 As shown in Figure c.

[0026] In addition, the compressive strength of the outer wall of the catheter 2 is greater than the compressive strength of the main infusion chamber 31 and the auxiliary infusion chamber 32.

[0027] In other words, the compressive strength of the outer wall of catheter 2 is designed to be greater than that of the internal chamber, so as to ensure that the outer wall of catheter 2 is not easily deformed when under pressure.

[0028] In a preferred embodiment, the liquid-stopping component 3 includes: Cavity 37 is formed inside the conduit 2; Two sealing components 34 are configured and installed in the cavity 37, and respectively sleeved on the outer walls of the main infusion cavity 31 and the auxiliary infusion cavity 32; The inlet pipe 35 is fixed inside the conduit 2 and is connected to the sealing assembly 34 by multiple branch pipes 38; The normally closed capsule 36 is fitted onto the outer wall of the inlet tube 35 and is fixedly connected to the catheter.

[0029] It should be noted that the inlet pipe 35 is connected to the liquid supply device on the outer wall, and extends out of the conduit 2 and is equipped with a control valve (not shown in the figure) for filling the closed assembly 34 with liquid.

[0030] In a preferred embodiment, the enclosure component 34 includes: Two liquid-stopping bladders 341 are configured and symmetrically fixed within the cavity 37; A sealing plate 344 is fixed on one side of the two liquid-stopping bladders 341 that are close to each other, and the width of the sealing plate 344 is greater than the diameter of the main infusion chamber 31 and the auxiliary infusion chamber 32. Multiple limiting balls 345 are configured and fixed on the side of the two closed plates 344 that are close to each other, and do not contact the main infusion chamber 31 and the auxiliary infusion chamber 32.

[0031] In other words, by injecting liquid into the stop-fluid bladder 341 to make it expand, it can push the two sealing plates 344 closer to each other, thereby squeezing the main infusion chamber 31 and the auxiliary infusion chamber 32. The sealing plates 344 can be limited by the limiting ball 345, thereby avoiding excessive squeezing of the main infusion chamber 31 and the auxiliary infusion chamber 32. The squeezing force is sufficient to keep the main infusion chamber 31 and the auxiliary infusion chamber 32 in a closed state.

[0032] Preferably, the stop-fluid balloon 341 includes a closure section 342 and a transfer section 343. The closure section 342 is sleeved with the main infusion chamber 31 and the auxiliary infusion chamber 32. The transfer section 343 communicates with the closure section 342, and one end of the transfer section 343 exposes the catheter 2.

[0033] It should be noted that the height of the stop-fluid bladder 341 is higher than the height of the sealing plate 344. That is, when the two stop-fluid bladders 341 expand, the two sealing plates 344 close. At this time, the position of the stop-fluid bladder 341 above the sealing plate 344 can contact the outer wall of the main infusion chamber 31 and the auxiliary infusion chamber 32, thereby facilitating the transmission of pressure fluctuations.

[0034] The closure section 342 is used to compress the main infusion chamber 31 and the auxiliary infusion chamber 32 to close them. One end of the transmission section 343 exposes the outer wall of the catheter 2. Its function is to transmit the pressure fluctuations in the blood vessel through the capsule wall to the liquid column in the blocked main infusion chamber 31 and auxiliary infusion chamber 32, thereby transmitting the pressure fluctuations to the external sensor through the liquid column.

[0035] It is important to note that placing the sensor externally can effectively prevent damage. Due to the complex composition of blood, electrochemical corrosion and protein deposition may occur, leading to signal drift and failure. In other words, the optimal solution is to use an internal stop-fluid bladder 341 for blocking and an externally placed sensor. Furthermore, by blocking the blood bladder 341 close to the heart, the pressure stabilization time is greatly shortened, reducing the pressure fluctuation time of the fluid column in the main infusion chamber 31 and the auxiliary infusion chamber 32, making central venous pressure measurement faster and readings more accurate.

[0036] In addition, the initial state of the normally closed bladder 36 is to squeeze the inlet tube 35 to close it.

[0037] Preferably, the initial state of the stop-fluid bladder 341 is such that the inner wall of the closed section 342 is in contact with the main infusion chamber 31 and the auxiliary infusion chamber 32, and at this time the liquid pressure inside it is lower than the liquid pressure inside the normally closed bladder 36.

[0038] In other words, the initial state (i.e., the natural state) of the normally closed cyst 36 exerts radial pressure on the inlet tube 35, causing it to close. Figure 3 The normally closed bladder 36 is filled with sterile saline and maintains a certain initial pressure P1. The stop-fluid bladder 341 is also filled with sterile saline. In its initial state, the inner wall of the closed segment 342 adheres to the outer walls of the main infusion chamber 31 and the auxiliary infusion chamber 32, without compression. At this time, the fluid pressure inside the stop-fluid bladder 341 is P0, and P0 <P1( Figure 3 Due to the pressure difference (P1>P0) and the physical compression of the inlet pipe 35 by the normally closed bladder 36, the system is in a stable self-locking state. The liquid in the stop bladder 341 cannot flow back, which facilitates the rapid expansion and closure of the main infusion chamber 31 and the auxiliary infusion chamber 32 by the stop bladder 341.

[0039] In addition, the fluid inside the stop sac 341 and the normally closed sac 36 is filled with sterile physiological saline.

[0040] In practice, catheter 2 is percutaneously inserted into the patient's central vein. The markings on catheter 2 help with positioning. The connector 1 at the proximal end of catheter 2 is fixed to the skin. The main tube 4 and branch tube 5 are connected to different infusion devices through connectors 6. During infusion, the fluid flows to the main infusion chamber 31 or the auxiliary infusion chamber 32. The pressure causes the leaflets of the three-way valve 33 to open outward, allowing the fluid to enter the blood vessel. When the infusion is stopped, the leaflets close automatically, effectively preventing blood reflux.

[0041] When central venous pressure needs to be measured, normal saline is injected into the inlet tube 35 via an external fluid supply device. Figure 6The injection pressure causes the inlet tube 35 to exert pressure on the normally closed bladder 36, deforming it and thus putting the inlet tube 35 in a connected state. At this time, physiological saline flows into the stop bladder 341 through the inlet tube 35. The two stop bladders 341 expand due to the inflow of liquid, and their closed sections 342 approach each other, squeezing and pushing the sealing plate 344, thereby squeezing the main infusion chamber 31 and the auxiliary infusion chamber 32, making their lumens completely closed. Figure 6 At this point, the pressure fluctuations within the blood vessel are transmitted through the transmission segment 343, which exposes the position of catheter 2. This is coupled to the stationary fluid column within the blocked lumen (main infusion chamber 31 and auxiliary infusion chamber 32) and conducted to the external sensor, thereby obtaining an accurate central venous pressure reading. After the measurement is completed, the saline solution in the stop bladder 341 is withdrawn, the normally closed bladder 36 returns to its original state, and the infusion tube 35 is re-closed, completing the self-locking process.

[0042] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care, characterized in that, include: The connecting seat (1) has a conduit (2) connected to one end and a main pipe (4) and a branch pipe (5) connected to the other end, and both the main pipe (4) and the branch pipe (5) are connected to the conduit (2); A liquid-stopping assembly (3) is installed inside the end of the conduit (2) away from the connector (1); A connector (6) is installed at the end of the main pipe (4) and branch pipe (5) away from the connector (1) for connection to an external infusion device.

2. The critical care emergency high-pressure resistant multi-lumen anti-reflux central venous catheter according to claim 1, characterized in that, The catheter (2) has two independent chambers inside, including a main infusion chamber (31) and at least one auxiliary infusion chamber (32), and the catheter (2) is made of medical grade polyurethane.

3. The critical care emergency high-pressure resistant multi-lumen anti-reflux central venous catheter according to claim 2, characterized in that, Both the main infusion chamber (31) and the auxiliary infusion chamber (32) are equipped with a three-way valve (33) at the end away from the connecting seat (1). The three-way valve (33) includes three leaflets, and the center of the three leaflets intersects to form a closed line. It is configured to open outward under positive fluid pressure, close automatically in the absence of pressure, and open inward under external negative pressure.

4. The critical care emergency high-pressure resistant multi-lumen anti-reflux central venous catheter according to claim 2, characterized in that, The compressive strength of the outer wall of the catheter (2) is greater than that of the main infusion chamber (31) and the auxiliary infusion chamber (32).

5. A high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care according to claim 2, characterized in that, The liquid-stopping component (3) includes: A cavity (37) is formed inside the conduit (2); Two sealing components (34) are configured to be installed in the cavity (37) and respectively fitted onto the outer walls of the main infusion chamber (31) and the auxiliary infusion chamber (32); The inlet pipe (35) is fixed inside the conduit (2) and is connected to the sealing assembly (34) by multiple branch pipes (38); The normally closed capsule (36) is fitted onto the outer wall of the inlet tube (35) and is fixedly connected to the catheter.

6. A high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care according to claim 5, characterized in that, The enclosure component (34) includes: Two stop-fluid bladders (341) are configured and symmetrically fixed in the cavity (37); A sealing plate (344) is fixed on one side of the two liquid-stopping bladders (341) that are close to each other, and the width of the sealing plate (344) is greater than the diameter of the main infusion chamber (31) and the auxiliary infusion chamber (32); The limiting ball (345) is configured in multiple ways and fixed on one side of the two closed plates (344) that are close to each other, and does not contact the main infusion chamber (31) and the auxiliary infusion chamber (32).

7. A high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care as described in claim 6, characterized in that, The stop-fluid balloon (341) includes a closure section (342) and a transfer section (343). The closure section (342) is connected to the main infusion chamber (31) and the auxiliary infusion chamber (32). The transfer section (343) is connected to the closure section (342) and one end of the transfer section exposes the catheter (2).

8. A high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care according to claim 6, characterized in that, The initial state of the normally closed sac (36) is to squeeze the inlet tube (35) to close it.

9. A high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care according to claim 7, characterized in that, The initial state of the stop-fluid bladder (341) is that the inner wall of the closed segment (342) slightly squeezes the main infusion chamber (31) and the auxiliary infusion chamber (32), and at this time the liquid pressure inside is lower than the liquid pressure inside the normally closed bladder (36).

10. A high-pressure resistant multi-lumen anti-reflux central venous catheter for critical care according to claim 8, characterized in that, The fluid inside the stop sac (341) and normally closed sac (36) is sterile saline.

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