Sealing tube and indwelling catheter

Abstract

The application relates to the technical field of medical equipment, and provides a plugging tube and an indwelling catheter. The plugging tube comprises a main tube body, one end of the main tube body is a liquid injection end provided with a liquid injection port, the other end of the main tube body is an insertion end used for inserting a venous catheter, the insertion end is connected with a baffle, the baffle is provided with a mounting port at the insertion end, and the side wall of the main tube body is provided with a flushing port; an air bag is fixedly connected to one side of the baffle away from the liquid injection end, the air bag can be inserted into the venous catheter along the insertion end when the air bag is contracted, and the air bag is used for plugging an opening of the distal end of the venous catheter when the air bag is inflated; an air guide tube is arranged in the main tube body, one end of the air guide tube is connected with the air bag and seals the mounting port, and the other end of the air guide tube extends to the liquid injection end to form an inflation port; a plugging assembly is mounted on the liquid injection end and can be connected with the venous catheter to seal the space between the main tube body and the venous catheter and the liquid injection port. The air bag and the plugging assembly can stably close the two ends of the venous catheter, leakage of liquid medicine and backflow of blood are avoided, and therefore the plugging effect is improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a sealing tube and an indwelling catheter. Background Technology

[0002] In the procedure of locking the catheter after indwelling venous catheter placement, the clinical routine is to inject heparin sodium or low concentration anticoagulant into the catheter lumen to prevent blood stasis and clotting by utilizing the anticoagulant properties of the drug (i.e., the "heparin locking method").

[0003] However, when anticoagulant drugs are injected into the venous catheter, some of the drugs can easily be injected into the patient's body through the venous catheter. When the patient's position changes or limbs move, the venous catheter is prone to internal pressure fluctuations due to bending or compression, which can cause the fluid in the venous catheter to be squeezed into the patient's body and blood in the blood vessels to be drawn into the venous catheter, affecting the sealing effect. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a sealing tube and an indwelling catheter.

[0005] The first aspect of this application provides a sealing tube, comprising:

[0006] The main body has an injection end with an injection port at one end and an insertion end for inserting a venous catheter at the other end. The insertion end is connected to a baffle, and the baffle forms an installation port at the insertion end. The side wall of the main body is provided with a flushing port.

[0007] An air bladder is fixedly connected to the side of the baffle facing away from the injection end. When the air bladder contracts, it can be inserted into the venous catheter along with the insertion end. When the air bladder expands, it is used to block the opening at the distal end of the venous catheter.

[0008] An air guide tube is disposed in the main tube body, one end of which is connected to the airbag through the mounting port and the mounting port is sealed, and the other end extends to the liquid injection end to form an inflation port.

[0009] A sealing assembly is installed on the injection end and can be connected to the venous catheter to seal the space between the main body and the venous catheter, as well as the injection port.

[0010] Optionally, the sealing assembly includes a retaining cap and a sealing cap;

[0011] The fixing cap has a recessed groove on one side to form a receiving groove. The bottom of the receiving groove is provided with a clearance through hole. The receiving groove is used to receive the proximal end of the venous catheter. The side wall of the receiving groove can be sealed to the venous catheter. The main body is placed in the clearance through hole and sealed to the hole wall of the clearance through hole so that the fixing cap seals the opening of the proximal end of the venous catheter.

[0012] The sealing cap is installed on the side of the fixing cap facing away from the insertion end and seals the injection port.

[0013] Optionally, the main body is threadedly connected to the clearance through hole to seal the space between the main body and the hole wall of the clearance through hole.

[0014] Optionally, the sidewall of the receiving groove is provided with an internal thread, which is used to engage with the thread on the proximal end of the venous catheter.

[0015] Optionally, one side of the sealing cap is recessed to form a sealing groove, and the fixing cap is inserted into the sealing groove and sealed to the side wall of the sealing groove, so as to form a sealed space between the injection end and the bottom of the sealing groove to seal the injection port.

[0016] Optionally, the air duct is equipped with a one-way valve, which can prevent the gas in the airbag from being discharged through the inflation port.

[0017] Optionally, the axis of the flushing port is inclined relative to the axis of the main body towards the insertion end.

[0018] Optionally, both the main body and the air guide tube are plastic tubes.

[0019] Optionally, when the airbag inflates, the radial dimension of the airbag along the main body gradually decreases in the direction away from the baffle.

[0020] A second aspect of this application provides an indwelling catheter, including a venous catheter and an occlusion catheter as described in any of the preceding claims;

[0021] The venous catheter is hollow inside, with one end of the venous catheter having a first opening at the distal end and the other end having a second opening at the proximal end. The insertion end of the main tube is inserted into the venous catheter through the second opening, and the balloon is positioned at the first opening. The sealing assembly is connected to the venous catheter and the main tube to seal the injection port and the second opening.

[0022] The technical solution provided in this application has the following advantages compared with the prior art:

[0023] The occlusion catheter provided in this application has a balloon at the insertion end of the main body. After the venous catheter is inserted into the main body, the balloon inflates to seal the distal opening of the venous catheter. Anticoagulant drugs can be injected into the venous catheter through the injection port and flushing port. The occlusion component, installed at the injection end, not only seals the injection port but also seals the gap between the main body and the venous catheter. The main body and the occlusion component work together to form a sealed space within the venous catheter, where the medication remains, thus completing the occlusion process. When medication is injected into the venous catheter through the main body, the balloon prevents the medication from entering the blood vessel. When the venous catheter is bent or kinked, the main body is supported between the balloon and the occlusion component, allowing the balloon and the occlusion component to stably seal both ends of the venous catheter, preventing medication leakage and blood backflow, thereby improving the occlusion effect. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front sectional view of the occlusion tube and the venous catheter assembled according to the embodiments of this application;

[0027] Figure 2 This is a front sectional view of the main body described in the embodiment of this application;

[0028] Figure 3 This is a front sectional view of the main body after the venous catheter has been inserted, as described in the embodiments of this application;

[0029] Figure 4 This is a front sectional view of the sealing assembly described in an embodiment of this application;

[0030] Figure 5 This is a top view of the fixing cap described in the embodiment of this application;

[0031] Figure 6 This is a front cross-sectional view of the sealing cap described in the embodiment of this application.

[0032] Among them, 1. Main body; 11. Injection end; 111. Injection port; 12. Insertion end; 13. Baffle; 131. Installation port; 14. Flushing port; 2. Airbag; 3. Air tube; 31. Inflation port; 32. One-way valve; 4. Sealing assembly; 41. Fixing cap; 411. Receiving groove; 412. Clearance through hole; 42. Sealing cap; 421. Sealing groove; 5. Intravenous catheter; 51. Distal end; 511. First opening; 52. Proximal end; 521. Second opening. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0035] Reference Figures 1 to 6 As shown, the first aspect of this application provides a sealing tube, including a main body 1, an airbag 2, an air guide tube 3, and a sealing component 4; one end of the main body 1 is an injection end 11 with an injection port 111, and the other end is an insertion end 12 for inserting a venous catheter 5. The insertion end 12 is connected to a baffle 13, and the baffle 13 forms an installation port 131 at the insertion end 12. The side wall of the main body 1 is provided with a flushing port 14; the airbag 2 is fixedly connected to the side of the baffle 13 facing away from the injection end 11. When the airbag 2 contracts, it can be inserted into the venous catheter 5 along with the insertion end 12. When the airbag 2 expands, it is used to seal the opening of the distal end 51 of the venous catheter 5; the air guide tube 3 is disposed in the main body 1, one end of which is connected to the airbag 2 through the installation port and seals the installation port, and the other end extends to the injection end 11 to form an inflation port 31; the sealing component 4 is installed on the injection end 11 and can be connected to the venous catheter 5 to seal the space between the main body 1 and the venous catheter 5 and the injection port 111.

[0036] Specifically, the venous catheter 5 is a tube placed inside a vein, which can remain in the human body for a long time, facilitating the delivery of drugs into the vein. One end of the venous catheter 5 is inside the vein, and the other end is exposed on the body surface. The end of the venous catheter 5 used for insertion into the human body is the distal end 51, and the end exposed on the body surface is the proximal end 52. Medical personnel inject drugs into the venous catheter 5 through the proximal end 52, allowing the drugs to enter the human body through the distal end 51 of the venous catheter 5.

[0037] The aforementioned main tube 1 can be a slender, hollow plastic tube with an outer diameter smaller than the inner diameter of the venous catheter 5, so that the main tube 1 can be inserted into the venous catheter 5. The length of the main tube 1 is designed according to clinical needs, as long as the main tube 1 is inserted into the venous catheter 5 and the insertion end 12 of the main tube 1 can be moved to the opening of the distal end 51 of the venous catheter 5.

[0038] The main tube 1 is a hollow tube structure with openings at both ends. One end of the main tube 1 is the injection end 11, and its opening serves as the injection port 111. The injection port 111 is a circular opening with a diameter adapted to a syringe interface, such as a standard Luer interface. Anticoagulant drugs or saline can be injected into the interior of the main tube 1 through the injection port 111. The other end of the main tube 1 is the insertion end 12 for inserting the intravenous catheter 5. A baffle 13 is connected to the insertion end 12. The baffle 13 can be partially spaced from the inner wall of the main tube 1 to form an installation port 131, which communicates with the internal space of the main tube 1. Alternatively, the baffle 13 can cover the opening of the main tube 1 at the insertion end 12, and the baffle 13 can have a through hole as the installation port 131.

[0039] The aforementioned flushing port 14 is located on the side wall of the main tube body 1, that is, the flushing port 14 is located between the insertion end 12 and the injection end 11. The flushing port 14 can be located near the insertion end 12, so that after the main tube body 1 is inserted into the venous catheter 5, the flushing port 14 is located inside the venous catheter 5.

[0040] The aforementioned airbag 2 can be made of medical silicone rubber. When it contracts, it fits tightly against the baffle 13 and becomes a flat strip. When it expands, it becomes conical or spherical. The maximum diameter of the airbag 2 after expansion is slightly larger than the inner diameter of the opening of the distal end 51 of the venous catheter 5, so that the airbag 2 can tightly abut against the inner wall of the opening of the distal end 51 of the venous catheter 5 after expansion, so that the airbag 2 can block the opening of the distal end 51 of the venous catheter 5.

[0041] The aforementioned air guide tube 3 can be a slender plastic tube with an inner diameter smaller than that of the main body 1. One end of the air guide tube 3 is sealed to the airbag 2 through the mounting port 131, and the other end extends to the injection end 11 to form an inflation port 31. The inflation port 31 can be connected to a syringe or air pump, allowing the syringe or air pump to inflate the airbag 2 through the inflation port 31. Alternatively, a sealant can be provided between the air guide tube 3 and the inner wall of the mounting port 131 to seal the mounting port 131; or the air guide tube 3 can be tightly abutted against the inner wall of the mounting port 131 to seal the mounting port 131.

[0042] The aforementioned sealing component 4 may include an elastic block, with a first protrusion in the middle of the elastic block and a first annular protrusion on the outer side of the first protrusion; the elastic block can cover the injection port 111, the first protrusion is inserted into the injection port 111 and abuts against the inner wall of the main tube 1, so that the first protrusion seals the injection port 111; the first annular protrusion can be inserted into the space between the main tube 1 and the venous catheter 5, and the first annular protrusion abuts against the outer wall of the main tube 1 and the inner wall of the venous catheter 5, so that the first annular protrusion seals the space between the main tube 1 and the venous catheter 5.

[0043] Alternatively, the occlusion component 4 can include a fixation cap and an occlusion cap, made of medical-grade ABS plastic. The fixation cap is connected to the proximal end 52 of the intravenous catheter 5 via threads or clips, so that the fixation cap is positioned between the main tube body 1 and the intravenous catheter 5, and the fixation cap is sealed to the outer wall of the main tube body 1 and the inner wall of the intravenous catheter 5. The occlusion cap is connected to the fixation cap and can close the injection port 111.

[0044] Injection port 111 can inject medication into the main tube 1, while flushing port 14 can drain medication from the main tube 1. After the balloon 2 is inflated, it can block the opening of the distal end 51 of the venous catheter 5. The sealing component 4 can form a sealed space between the main tube 1 and the venous catheter 5, so that the medication can remain in the sealed space and the catheter can be sealed.

[0045] The occlusion tube provided in this embodiment has a balloon 2 at the insertion end 12 of the main body 1. After the insertion end 12 of the main body 1 is inserted into the venous catheter 5, the balloon 2 inflates to seal the opening of the distal end 51 of the venous catheter 5. Anticoagulant drugs can be injected into the venous catheter 5 through the injection port 111 and the flushing port 14. The occlusion component 4 is installed at the injection end 11, which can seal both the injection port 111 and the gap between the main body 1 and the venous catheter 5, so that the main body 1 and the occlusion component 4 cooperate to form a closed space in the venous catheter 5, and the drug solution is retained in the closed space to complete the occlusion. When the drug solution is injected into the venous catheter 5 through the main body 1, the balloon 2 prevents the drug solution from entering the blood vessel. When the venous catheter 5 is bent or kinked, the main body 1 is supported between the balloon 2 and the occlusion component 4, so that the balloon 2 and the occlusion component 4 can stably seal both ends of the venous catheter 5, avoid drug solution leakage and blood backflow, thereby improving the occlusion effect.

[0046] In specific use, the occlusion tube provided in this embodiment is as follows: after the main tube body 1 is inserted into the venous catheter 5, the insertion end 12 moves to the opening of the distal end 51 of the venous catheter 5, and the balloon 2 is inflated through the inflation port 31. After the balloon 2 expands, it can block the opening of the distal end 51 of the venous catheter 5. The anticoagulant is injected into the main tube body 1 through the injection port 111 and flows from the flushing port 14 to the space between the main tube body 1 and the venous catheter 5, so that the drug flushes the venous catheter 5. After flushing the venous catheter 5, the occlusion component 4 is connected to the injection end 11, so that the occlusion component 4 blocks the injection port 111 and forms a sealed space between the main tube body 1 and the venous catheter 5. The anticoagulant is stored in the sealed space as the occlusion fluid to complete the occlusion operation.

[0047] When intravenous catheter 5 is needed for infusion, the occlusion assembly 4 is removed from the main tube 1, the medication between the main tube 1 and the intravenous catheter 5 is extracted, the gas in the balloon 2 is then extracted, the main tube 1 is pulled out of the intravenous catheter 5, the medication is infused into the intravenous catheter 5, and the medication is discharged through the opening at the distal end 51 of the intravenous catheter 5.

[0048] Reference Figure 1 and Figures 4 to 6 As shown, in some embodiments, the occlusion assembly 4 includes a fixing cap 41 and an occlusion cap 42; one side of the fixing cap 41 is recessed to form a receiving groove 411, and the bottom of the receiving groove 411 is provided with a clearance through hole 412. The receiving groove 411 is used to receive the proximal end 52 of the venous catheter 5. The side wall of the receiving groove 411 can be sealed to the venous catheter 5. The main body 1 is placed in the clearance through hole 412 and is sealed to the hole wall of the clearance through hole 412 so that the fixing cap 41 seals the opening of the proximal end 52 of the venous catheter 5; the occlusion cap 42 is installed on the side of the fixing cap 41 facing away from the insertion end 12 and seals the injection port 111.

[0049] With this configuration, when the fixation cap 41 is not installed, the medication entering the venous catheter 5 through the main tube 1 can be discharged through the proximal end 52 of the venous catheter 5 to flush it. After the fixation cap 41 is installed on the proximal end 52 of the venous catheter 5, the infusion port 111 remains open, allowing anticoagulant drugs to be introduced into the venous catheter 5 through the main tube 1, ensuring that pure medication remains in the venous catheter 5. Furthermore, when the occlusion cap 42 is not installed, the communication between the main tube 1 and the venous catheter 5 balances the air pressure, reducing the resistance to removing the fixation cap 41.

[0050] Specifically, the fixing cap can be a cylindrical block with a recessed side along the axial direction to form a receiving groove 411. The bottom of the receiving groove 411 is circular to fit the shape of the venous catheter 5. The inner diameter of the receiving groove 411 is slightly larger than the outer diameter of the proximal end 52 of the venous catheter 5, so that the proximal end 52 of the venous catheter 5 can be inserted into the receiving groove 411.

[0051] The proximal end 52 of the standard model intravenous catheter 5 has external threads on its outer wall. Alternatively, internal threads can be provided on the side wall of the receiving groove 411. The internal threads mate with the external threads to create a sealed connection between the side wall of the receiving groove 411 and the outer wall of the intravenous catheter 5. Alternatively, after the proximal end 52 of the intravenous catheter 5 is inserted into the receiving groove 411, sealant can be applied between the receiving groove 411 and the outer wall of the intravenous catheter 5 to create a sealed connection between the side wall of the receiving groove 411 and the intravenous catheter 5.

[0052] The bottom of the aforementioned receiving groove 411 is provided with a clearance through hole 412, which penetrates the fixing cap 41. The diameter of the clearance through hole 412 matches the diameter of the main pipe body 1, allowing the main pipe body 1 to pass through the clearance through hole 412. Optionally, the wall of the clearance through hole 412 can be threaded, and the outer wall of the main pipe body 1 near the injection end 11 can also be threaded, allowing the main pipe body 1 to be threadedly connected to the clearance through hole 412 for a sealed connection. Alternatively, a sealing ring can be provided between the main pipe body 1 and the clearance through hole 412, fitted onto the main pipe body 1 and abutting against the inner wall of the clearance through hole 412 for a sealed connection.

[0053] The sidewall of the aforementioned receiving groove 411 is sealed to the outer wall of the venous catheter 5, and the main body 1 is sealed to the clearance through hole 412, so that the fixing cap 41 forms a sealed space at the opening of the proximal end 52 of the venous catheter 5, thereby sealing the opening of the proximal end 52 of the venous catheter 5 with the fixing cap 41.

[0054] The aforementioned sealing cap 42 can be a plate structure, and is connected to the fixing cap 41 by adhesive bonding to seal the injection port 111. Alternatively, the sealing cap 42 can have a groove, into which the fixing cap 41 is inserted, and the sidewall of the groove is sealed to the outer wall of the fixing cap 41, so that the sealing cap 42 forms a sealed space at the injection port 111 to seal the injection port 111.

[0055] Reference Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the main body 1 is threadedly connected to the clearance through hole 412 to seal the space between the main body 1 and the hole wall of the clearance through hole 412.

[0056] This configuration allows the drive cap 41 to rotate relative to the main tube body 1, enabling it to move towards the intravenous catheter 5 while simultaneously sealing with the main tube body 1, thus improving the stability of the seal between the cap 41 and the main tube body 1. The threaded connection provides excellent sealing strength and stability, preventing the main tube body 1 from accidentally dislodging during operation.

[0057] Specifically, the outer wall of the main pipe body 1 is provided with external threads, and the inner wall of the clearance through hole 412 is provided with matching internal threads. After tightening, the main pipe body 1 and the fixing cap 41 form a rigid connection. The tight fit between the external and internal threads can prevent liquid from passing through the space between the main pipe body 1 and the clearance through hole 412, so as to seal the connection between the main pipe body 1 and the clearance through hole 412.

[0058] Reference Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the sidewall of the receiving groove 411 is provided with internal threads, which are used to engage with the threaded connection on the proximal end 52 of the venous catheter 5.

[0059] This design ensures that the proximal opening 52 of the intravenous catheter is completely sealed, preventing blood reflux or drug leakage. The threaded structure allows caregivers to quickly fix or remove the fixation cap 41 by rotating it, improving clinical efficiency.

[0060] Specifically, the sidewall of the receiving groove 411 is machined with internal threads, the thread length of which covers the sidewall of the receiving groove 411, and the pitch of the internal thread matches the external thread of the proximal end 52 of the venous catheter 5. During the process of inserting the proximal end 52 of the venous catheter 5 into the receiving groove 411, the driving cap 41 rotates relative to the venous catheter 5, thereby enabling the internal thread to engage with the external thread.

[0061] After the proximal end 52 of the venous catheter is screwed into the receiving groove 411, the axial force generated by the thread engagement ensures that the opening of the proximal end 52 of the venous catheter fits tightly against the bottom of the receiving groove 411, preventing fluid leakage from the proximal end. After the thread is tightened, there is no relative rotation between the fixing cap 41 and the venous catheter 5, preventing the connection from becoming loose due to patient movement.

[0062] When the wall of the clearance through hole 412 is threaded, the thread direction of the wall of the clearance through hole 412 can be the same as that of the internal thread of the side wall of the receiving groove 411, so that the fixing cap 41 rotates in one direction relative to the venous catheter 5, so that the main body 1 can be threadedly connected to the wall of the clearance through hole 412, and the receiving groove 411 can be threadedly connected to the venous catheter 5 simultaneously.

[0063] Since the through hole 412 is located at the bottom of the receiving groove 411, the threaded area on the main body 1 can be larger than the threaded area on the receiving groove 411 in the axial direction. This allows the fixing cap 41 to be threadedly connected to the main body 1 first, and then to the intravenous catheter 5, ensuring that when the fixing cap 41 is threadedly connected to the intravenous catheter 5, it is also threadedly connected to the main body 1. Alternatively, after the intravenous catheter 5 is inserted into the main body 1, the threaded area on the main body 1 can be located outside the proximal end 52 of the intravenous catheter 5, ensuring that when the fixing cap 41 is threadedly connected to the intravenous catheter 5, it is also threadedly connected to the main body 1.

[0064] Reference Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, one side of the sealing cap 42 is recessed to form a sealing groove 421, and the fixing cap 41 is inserted into the sealing groove 421 and sealed to the side wall of the sealing groove 421 to form a sealed space between the injection end 11 and the bottom of the sealing groove 421 to seal the injection port 111.

[0065] With this configuration, the sealing groove 421 accommodates the fixing cap 41, which can protect the fixing cap 41 and prevent foreign objects from directly colliding with the fixing cap 41.

[0066] Specifically, the sealing cap 42 can be a cylindrical cover with a recessed sealing groove 421 on one side. The shape of the sealing groove 421 matches the shape of the fixing cap 41. An annular sealing ring can be provided on the side wall of the sealing groove 421. After the fixing cap 41 is inserted into the sealing groove, the annular sealing ring is deformed by pressure and closely abuts against the outer wall of the fixing cap 41, so that the annular sealing ring seals the gap between the fixing cap 41 and the side wall of the sealing groove 421.

[0067] Alternatively, the fixing cap 41 can be threaded on the radial outer wall of the main body 1, and the side wall of the sealing groove 421 can be threaded. After the fixing cap 41 is inserted into the sealing groove 421, the sealing cap 42 is driven to rotate relative to the fixing cap 41, so that the sealing cap 42 and the fixing cap 41 can be connected.

[0068] Reference Figure 1 and Figure 2 As shown, in some embodiments, a one-way valve 32 is provided in the air duct 3, which can prevent the gas in the airbag 2 from being discharged through the inflation port 31.

[0069] With this configuration, the one-way valve 32 prevents the balloon 2 from contracting due to pressure fluctuations within the venous catheter, ensuring a long-lasting occlusion effect.

[0070] Specifically, the one-way valve 32 can be either a duckbill valve or an umbrella valve, made of silicone, and installed in the middle of the air duct 3. The opening pressure of the one-way valve 32 can be selected as 5-10 kPa, allowing gas to flow only from the inflation port 31 to the airbag 2 and preventing reverse gas flow.

[0071] Multiple silicone pads can be installed on the inner wall of the aforementioned air duct 3, forming a one-way valve 32. After installing the one-way valve 32, when it is necessary to expel gas from the airbag 2, a rigid tube can be inserted into the air duct 3 to open the one-way valve 32.

[0072] When pressure is applied through the inflation port 31, the one-way valve 32 is pushed open by the airflow, allowing gas to enter the airbag 2 and inflate it. After inflation stops, when the pressure inside the airbag 2 is higher than that in the air tube 3, the one-way valve 32 automatically closes to prevent gas backflow and maintain the inflated state of the airbag 2.

[0073] Reference Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the axis of the flushing port 14 is inclined toward the insertion end 12 relative to the axis of the main body 1.

[0074] With this design, after the anticoagulant is injected through the injection port 111, some of the liquid is sprayed out obliquely through the inclined flushing port 14, flowing spirally along the inner wall of the venous catheter 5 to flush away residual blood on the catheter wall, thus improving the flushing effect. Furthermore, the inclined design ensures that the medication avoids the opening at the distal end 51 of the venous catheter 5, preventing the medication from directly impacting the balloon 2 and affecting the stability of the seal.

[0075] Specifically, the axis of the flushing port 14 can be angled at 45° with the axis of the main body 1, so that the opening of the flushing port 14 faces the insertion end 12. When the liquid flows out of the main body 1 through the flushing port 14, the flow direction of the liquid is at a 45° angle with the main body 1, causing the liquid to tilt and impact the venous catheter 5, ensuring that the liquid can flush the inner wall of the venous catheter 5 near the distal end 51. The distance between the flushing port 14 and the end of the insertion end 12 can be selected to be 10mm to 15mm, ensuring that the liquid flowing out of the flushing port 14 can cover the inner wall of the distal end 51 of the venous catheter 5.

[0076] Reference Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, both the main body 1 and the air duct 3 are plastic tubes.

[0077] With this design, the plastic tube is inexpensive to manufacture and easy to cut and trim, allowing the main tube 1 and the air tube 3 to be adapted to intravenous catheters 5 of different lengths.

[0078] Specifically, the main tube 1 can be made of transparent medical-grade polyvinyl chloride (PVC) or polyethylene (PE), which has a certain degree of flexibility to avoid damaging blood vessels during puncture. The airway 3 is made of the same material as the main tube 1.

[0079] The plastic tube can be cut and slit. In order to ensure that the balloon 2 can block the opening of the distal end 51 of the venous catheter 5, the length of the main tube 1 will be greater than the length of the venous catheter 5. After the main tube 1 is inserted into the venous catheter 5, the part of the main tube 1 and the air tube 3 outside the venous catheter 5 is too long, which affects the installation of the sealing component 4. At this time, the excessive part of the main tube 1 and the air tube 3 can be removed with a blade or scissors.

[0080] Reference Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, when the airbag 2 inflates, the radial dimension of the airbag 2 along the main body 1 gradually decreases in the direction away from the baffle 13.

[0081] With this configuration, by changing the depth at which the conical balloon 2 is inserted into the opening of the venous catheter 5, the conical balloon 2 can be adapted to openings of different sizes, making the balloon 2 compatible with venous catheters 5 of different inner diameters and reducing specification matching requirements.

[0082] Specifically, after the balloon 2 is inflated, it becomes conical. When the balloon 2 is inflated, the tip of its conical balloon 2 is inserted into the opening of the distal end 51 of the venous catheter 5, so that the side wall of the conical balloon 2 gradually fits into the inner wall of the opening of the distal end 51. The depth of the main tube 1 inserted into the venous catheter 5 can be changed so that the conical balloon 2 can abut against the side wall of the opening of the distal end 51 of different sizes, so that the balloon 2 can adapt to the venous catheter 5 with the distal end 51 opening of different sizes.

[0083] Reference Figures 1 to 6 As shown, a second aspect of this application provides an indwelling catheter, including a venous catheter 5 and a blocking tube as described in any of the preceding claims; the venous catheter 5 is hollow inside, and one end of the venous catheter 5 is a distal end 51 with a first opening 511, and the other end is a proximal end 52 with a second opening 521. The insertion end 12 of the main tube body 1 is inserted into the venous catheter 5 through the second opening 521, and the balloon 2 is disposed at the first opening 511. The blocking component 4 is connected to the venous catheter 5 and the main tube body 1 to seal the injection port 111 and the second opening 521.

[0084] Specifically, the venous catheter 5 is a hollow tube structure with a distal end 51 and a proximal end 52 at its two ends. The lumen of the venous catheter 5 forms a first opening 511 at the distal end 51 and a second opening 521 at the proximal end 52. The distal end 51 is used to insert into a blood vessel, allowing medical staff to administer drugs into the venous catheter 5 through the second opening 521, and the drugs can enter the blood vessel through the first opening 511.

[0085] The insertion end 12 of the main tube 1 can be inserted into the interior of the venous catheter 5 through the second opening 521, and the balloon 2 is positioned at the first opening 511. Inflating the balloon 2 can seal the first opening 511. The sealing component 4 is sealed between the inner wall of the proximal end 52 of the venous catheter 5 and the main tube 1, and the sealing component 4 seals the injection port 111, thus sealing the proximal end 52 of the venous catheter 5.

[0086] When the sealing assembly 4 includes a fixing cap 41 and a sealing cap 42, the sidewall of the receiving groove 411 can be threadedly connected to the outer wall of the proximal end 52, so that the fixing cap 41 seals the gap between the main body 1 and the second opening 521.

[0087] By using the occlusion tube as described above in the receiving tube, the balloon 2 blocks the first opening 511, and the main tube 1 and the occlusion component 4 cooperate to block the second opening 521. When flushing the venous catheter 5, the medication can be prevented from entering the blood vessel through the first opening 511. After the catheter is sealed, when the venous catheter 5 is bent, the main tube 1, the balloon 2, and the occlusion component 4 ensure that both ends of the venous catheter 5 are in a closed state to prevent medication leakage or blood backflow.

[0088] In specific use, the occlusion tube and indwelling catheter provided in this application embodiment are used such that the insertion end 12 of the main tube body 1 is inserted into the venous catheter 5 through the second opening 521, the insertion end 12 is moved to the first opening 511, the fixing cap 41 is put on the main tube body 1, and the air bag 2 is inflated through the inflation port 31. After the air bag 2 expands, it abuts against the inner wall of the first opening 511, so that the air bag 2 seals the first opening 511.

[0089] Anticoagulant is injected into the main tube 1 through the injection port 111 and flows from the flushing port 14 to the space between the main tube 1 and the venous catheter 5, flushing the inner wall of the venous catheter 5 before flowing out through the second opening 521. The fixing cap 41 is rotated so that the main tube 1 is threadedly connected to the clearance through hole 412 and the receiving groove 411 is threadedly connected to the proximal end 52 of the venous catheter 5. Then, the main tube 1 and the air tube 3 are cut on the side of the fixing cap 41 facing away from the insertion end 12. The fixing cap 41 is inserted into the sealing groove 421 so that the fixing cap 41 is threadedly connected to the sealing groove, thereby making the fixing cap 41, the sealing cap 42 and the main tube 1 cooperate to seal the second opening 521. The balloon 2 seals the first opening 511 to complete the tube sealing operation.

[0090] When intravenous catheter 5 is needed for infusion, rotate the occlusion cap 42 to separate the occlusion cap 42 from the fixation cap 41, rotate the fixation cap 41 to separate the fixation cap 41 from the main tube body 1 and the intravenous catheter 5, degas the balloon 2 to return the balloon 2 to the contracted state, and pull the main tube body 1 out of the intravenous catheter 5; deliver the medication to the intravenous catheter 5 through the second opening 521.

[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sealing tube, characterized in that, include: The main body (1) has an injection end (11) with an injection port (111) at one end and an insertion end (12) for inserting a venous catheter (5) at the other end. The insertion end (12) is connected to a baffle (13), and the baffle (13) forms an installation port (131) on the insertion end (12). The side wall of the main body (1) is provided with a flushing port (14). An airbag (2) is fixedly connected to the side of the baffle (13) facing away from the injection end (11). When the airbag (2) contracts, it can be inserted into the venous catheter (5) along with the insertion end (12). When the airbag (2) expands, it is used to block the opening of the distal end (51) of the venous catheter (5). An air guide tube (3) is installed inside the main body (1). One end is connected to the airbag (2) through the mounting port and the mounting port is sealed. The other end extends to the injection end (11) to form an inflation port (31). A sealing assembly (4) is installed on the injection end (11) and can be connected to the venous catheter (5) to seal the space between the main body (1) and the venous catheter (5) and the injection port (111).

2. The sealing tube according to claim 1, characterized in that, The sealing assembly (4) includes a fixing cap (41) and a sealing cap (42); The fixing cap (41) has a recessed groove (411) on one side, and the bottom of the groove (411) is provided with a clearance through hole (412). The groove (411) is used to accommodate the proximal end (52) of the venous catheter (5). The side wall of the groove (411) can be sealed to the venous catheter (5). The main body (1) is placed in the clearance through hole (412) and sealed to the hole wall of the clearance through hole (412) so that the fixing cap (41) seals the opening of the proximal end (52) of the venous catheter (5). The sealing cap (42) is installed on the side of the fixing cap (41) facing away from the insertion end (12) and seals the injection port (111).

3. The sealing tube according to claim 2, characterized in that, The main body (1) is threadedly connected to the clearance through hole (412) to seal the space between the main body (1) and the hole wall of the clearance through hole (412).

4. The sealing tube according to claim 2, characterized in that, The receiving groove (411) has an internal thread on its side wall, which is used to engage with the thread on the proximal end (52) of the venous catheter (5).

5. The sealing tube according to claim 2, characterized in that, The sealing cap (42) has a recessed side forming a sealing groove (421). The fixing cap (41) is inserted into the sealing groove (421) and is sealed to the side wall of the sealing groove (421) to form a closed space between the injection end (11) and the bottom of the sealing groove (421) to seal the injection port (111).

6. The sealing tube according to claim 1, characterized in that, The air duct (3) is equipped with a one-way valve (32), which can prevent the gas in the airbag (2) from being discharged through the inflation port (31).

7. The sealing tube according to claim 1, characterized in that, The axis of the flushing port (14) is inclined toward the insertion end (12) relative to the axis of the main body (1).

8. The sealing tube according to claim 1, characterized in that, Both the main body (1) and the air duct (3) are plastic tubes.

9. The sealing tube according to claim 1, characterized in that, When the airbag (2) inflates, the radial dimension of the airbag (2) along the main body (1) gradually decreases in the direction away from the baffle (13).

10. An indwelling catheter, characterized in that, Includes an intravenous catheter (5) and an occlusion tube as described in any one of claims 1 to 9; The venous catheter (5) is hollow inside, and one end of the venous catheter (5) is a distal end (51) with a first opening (511) and the other end is a proximal end (52) with a second opening (521). The insertion end (12) of the main tube (1) is inserted into the venous catheter (5) through the second opening (521), and the balloon (2) is disposed at the first opening (511). The sealing component (4) is connected to the venous catheter (5) and the main tube (1) to seal the injection port (111) and the second opening (521).

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