A central venous catheter

Abstract

The utility model discloses a central venous catheter, including the catheter, the lower end of catheter is provided with the insertion end, the upper end sealed catheter lower end on the insertion end, the lower end lateral wall of catheter is provided with the closed valve that reduces to form the thickness, the thinnest place of closed valve is provided with the opening, the closed valve one -way open, the opening pressure intensity of closed valve is 100mmHg corresponding pressure intensity. The application is through the closed catheter lower end, and the closed valve of one -way conduction is arranged in the lower end lateral wall of catheter, when injecting medicine, the medicine pressure intensity is greater than the opening pressure intensity of closed valve, the closed valve opens at this time, and the medicine enters human body vein, because human body vein pressure intensity is far less than 100mmHg corresponding pressure intensity, and the closed valve will not open reversely, i.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a central venous catheter. Background Technology

[0002] Intravenous infusion techniques have undergone significant changes in recent years, evolving from the use of stainless steel needles, indwelling needles, and central venous catheters to the widely used peripherally implanted central venous catheters (PICCs). PICCs involve inserting a catheter into a vein in the arm, directly reaching a large vein near the heart. This avoids direct contact between medication and the arm's veins. Furthermore, the rapid blood flow in large veins quickly dilutes the medication, preventing irritation to the blood vessels. Therefore, PICCs effectively protect the veins of the upper limb, reduce the incidence of phlebitis, alleviate patient pain, and improve the patient's quality of life.

[0003] Because existing catheters are left in the body for a long time, the areas on the inner wall of the catheter that come into contact with blood may become adhered due to the deposition of blood components, leading to narrowing of the channel or complete blockage of the catheter orifice, which may affect the normal progress of infusion, blood transfusion or other treatments. Utility Model Content

[0004] This invention provides a central venous catheter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A central venous catheter includes a catheter, an insertion end at the lower end of the catheter, an upper end of the insertion end sealing the lower end of the catheter, a closure valve formed by reducing the thickness of the lower end sidewall of the catheter, and an opening at the thinnest part of the closure valve.

[0007] The closed valve opens in one direction only;

[0008] The opening pressure of the closed valve is the pressure corresponding to 100 mmHg.

[0009] Preferably, the lower end of the insertion end is pointed.

[0010] Preferably, the upper end of the catheter is connected to a connecting end.

[0011] Preferably, the catheter is provided with a fixing wing, and the fixing wing has suture holes at both ends, the suture holes being through holes.

[0012] Preferably, a fastener is fixedly connected to the fixed wing, and the conduit is inserted into the fastener.

[0013] Preferably, the fastener includes a fastening shell, a sealing plate is fixedly connected to the upper end of the fastening shell, an inner cylinder is provided between the sealing plate and the fastening shell, the inner cylinder is fixedly connected inside the fastening shell, a fastening rod is slidably connected to the fastening shell, the fastening rod is L-shaped, the short side of the fastening rod is located in the inner cylinder, a fastening sleeve is fixedly connected to the long side of the fastening rod, a roller is rotatably connected inside the fastening sleeve, and a guide tube is inserted between the roller and the side wall of the fastening shell.

[0014] Preferably, a first elastic element is provided between the short side of the fastening rod and the side wall of the inner cylinder, and the two ends of the first elastic element are fixedly connected to the fastening rod and the inner cylinder, respectively.

[0015] Preferably, a connecting slide rod is slidably inserted into the sealing plate, a rotating block is fixedly connected to the upper end of the connecting slide rod, a second elastic element is provided between the rotating block and the sealing plate, the second elastic element is sleeved on the connecting slide rod, and the two ends of the connecting slide rod abut against the rotating block and the sealing plate respectively;

[0016] A fastening platform is fixedly connected to the lower end of the connecting slide rod;

[0017] The lower surface of the sealing plate is provided with a lifting groove.

[0018] Preferably, the cross-section of the fastening platform is an inverted trapezoid.

[0019] Preferably, the upper surface of the fastening platform is rectangular;

[0020] The shape of the lifting groove matches the shape of the upper surface of the fastening platform.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] This application involves sealing the lower end of the catheter and setting a one-way closure valve on the side wall of the lower end of the catheter. When the drug is injected, the drug pressure is greater than the opening pressure of the closure valve. At this time, the closure valve opens, and the drug enters the human vein. Since the pressure of the human vein is much less than the pressure corresponding to 150 mmHg, the closure valve will not open in the opposite direction, thus forming a one-way closure condition. The human vein blood will not enter the catheter from the closure valve, will not accumulate in the catheter and form adhesions, and will not cause narrowing of the channel or complete blockage of the catheter orifice. It will not affect the normal progress of infusion, blood transfusion or other treatments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0024] Figure 2 For the present utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0025] Figure 3This is a schematic diagram of the closed-lobe distribution structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the fastener structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the mating structure of the fastening shell and fastening rod of this utility model;

[0028] Figure 6 A schematic diagram showing the structure of the conduit in the fastener according to this utility model;

[0029] Figure 7 This is a schematic diagram of the lifting groove structure of this utility model.

[0030] In the diagram: 1. Conduit; 2. Fixing wing; 3. Suture hole; 4. Fastener; 5. Connecting end; 6. Insertion end; 7. Closing flap; 8. Sealing plate; 9. Fastening shell; 10. Inner cylinder; 11. Fastening rod; 12. First elastic element; 13. Fastening sleeve; 14. Roller; 15. Fastening platform; 16. Connecting slide rod; 17. Second elastic element; 18. Rotating block; 19. Lifting groove. Detailed Implementation

[0031] In this utility model, the terms "first," "second," etc., are used for descriptive purposes only and do not specifically refer to any order or sequence, nor are they intended to limit the utility model. They are merely used to distinguish protective components or operations described with the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0032] Example 1

[0033] Please see Figures 1-3 A central venous catheter includes a catheter 1, an insertion end 6 at the lower end of the catheter 1, an upper end of the insertion end 6 sealing the lower end of the catheter 1, and a closure valve 7 formed by reducing the thickness of the lower sidewall of the catheter 1, with an opening at the thinnest part of the closure valve 7.

[0034] The closing petal 7 opens in one direction only.

[0035] The opening pressure of the closed flap 7 is the pressure corresponding to 100 mmHg.

[0036] The lower end of the insertion end 6 is pointed.

[0037] The upper end of the conduit 1 is connected to a connecting end 5.

[0038] The catheter 1 is provided with a fixing wing 2, and the fixing wing 2 is provided with suture holes 3 at both ends. The suture holes 3 are through holes.

[0039] The working principle and beneficial effects of the above scheme are as follows:

[0040] This application involves sealing the lower end of catheter 1 and placing a unidirectional closure valve 7 on the side wall of the lower end of catheter 1. During drug injection (the pressure at a drug level of 1500mm corresponds to 110mmHg), the drug pressure is greater than the opening pressure of the closure valve 7. At this time, the closure valve 7 opens, and the drug enters the body's veins. Because the body's venous pressure (central venous pressure reflects right atrial pressure and total blood volume, with a normal value of 2-8mmHg; pressure in superficial veins of the limbs, such as the veins on the back of the hand and foot, with a normal range of 5-15mmHg; prolonged standing may cause lower limb venous pressure to rise to 20-30mmHg); upper / When the inferior vena cava is obstructed, the venous pressure distal to the obstruction can rise to 20-50 mmHg; in the case of acute thrombosis, the venous pressure in the affected limb can reach 30-60 mmHg; in the case of complete venous occlusion, theoretically the venous pressure can be close to the diastolic pressure of the corresponding artery (e.g., the diastolic pressure of the lower limb artery is about 80 mmHg), which is much less than the pressure corresponding to 100 mmHg. The closure valve 7 will not open in reverse, thus forming a one-way patency condition. Human venous blood will not enter catheter 1 from the closure valve 7, will not deposit in the catheter and form adhesions, and will not cause narrowing of the channel or complete blockage of the catheter orifice. It will not affect the normal progress of infusion, blood transfusion or other treatments.

[0041] The fixed wing 2 allows the catheter 1 to be stably fixed to the human skin.

[0042] Example 2

[0043] Please see Figures 4-7 Based on Embodiment 1, a fastener 4 is fixedly connected to the fixed wing 2, and the conduit 1 is inserted into the fastener 4.

[0044] The fastener 4 includes a fastening shell 9, a sealing plate 8 is fixedly connected to the upper end of the fastening shell 9, an inner cylinder 10 is provided between the sealing plate 8 and the fastening shell 9, the inner cylinder 10 is fixedly connected inside the fastening shell 9, a fastening rod 11 is slidably connected to the fastening shell 9, the fastening rod 11 is L-shaped, the short side of the fastening rod 11 is located in the inner cylinder 10, a fastening sleeve 13 is fixedly connected to the long side of the fastening rod 11, a roller 14 is rotatably connected inside the fastening sleeve 13, and the guide tube 1 is inserted between the roller 14 and the side wall of the fastening shell 9.

[0045] A first elastic element 12 is provided between the short side of the fastening rod 11 and the side wall of the inner cylinder 10, and the two ends of the first elastic element 12 are respectively fixedly connected to the fastening rod 11 and the inner cylinder 10.

[0046] A connecting slide rod 16 is slidably inserted into the sealing plate 8. A rotating block 18 is fixedly connected to the upper end of the connecting slide rod 16. A second elastic element 17 is provided between the rotating block 18 and the sealing plate 8. The second elastic element 17 is sleeved on the connecting slide rod 16. The two ends of the connecting slide rod 16 abut against the rotating block 18 and the sealing plate 8, respectively.

[0047] The lower end of the connecting slide rod 16 is fixedly connected to a fastening platform 15;

[0048] The lower surface of the sealing plate 8 is provided with a lifting groove 19;

[0049] The fastening platform 15 has an inverted trapezoidal cross-section;

[0050] The upper surface of the fastening platform 15 is rectangular;

[0051] The shape of the lifting groove 19 matches the shape of the upper surface of the fastening table 15.

[0052] The working principle and beneficial effects of the above scheme are as follows:

[0053] After a single injection of the drug solution is completed, the catheter 1 needs to be sealed. Pressing the rotating block 18 moves the fastening platform 15 down through the connecting slide rod 16, compressing the second elastic element 17, so that the fastening platform 15 is inserted between multiple sets of fastening rods 11, so that the short sides of the multiple sets of fastening rods 11 squeeze the first elastic element 12, and the long sides of the multiple sets of fastening rods 11 move outward, so that the gap between the roller 14 and the side wall of the fastening shell 9 is reduced, and the multiple sets of rollers 14 clamp the catheter 1, thus completing the sealing of the catheter 1.

[0054] Furthermore, after pressing the rotating block 18 to make it protrude out of the lifting groove 19, it is necessary to rotate the rotating block 18 so that the upper edge of the rotating block 18 engages with the outer side of the lifting groove 19 to prevent the lifting groove 19 from moving upward under the action of the second elastic member 17.

[0055] The roller 14 makes the movement of the guide tube 1 within the fastening housing 9 smoother, and facilitates the adjustment of the position of the fixing wing 2 and the fastener 4 on the guide tube 1.

[0056] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A central venous catheter, characterized in that, The catheter includes an insertion end at its lower end, an upper end of which seals the lower end of the catheter, and a closure valve formed by reducing its thickness on the side wall of the lower end of the catheter. The thinnest part of the closure valve has an opening. The closed valve opens in one direction only; The opening pressure of the closed valve is the pressure corresponding to 100 mmHg.

2. A central venous catheter according to claim 1, characterized in that, The lower end of the insertion point is pointed.

3. A central venous catheter according to claim 1, characterized in that, The upper end of the catheter is connected to a connector.

4. A central venous catheter according to claim 1, characterized in that, The catheter is equipped with a fixing wing, and there are suture holes at both ends of the fixing wing. The suture holes are through holes.

5. A central venous catheter according to claim 4, characterized in that, A fastener is fixedly connected to the fixed wing, and the conduit is inserted into the fastener.

6. A central venous catheter according to claim 5, characterized in that, The fastener includes a fastening shell, a sealing plate is fixedly connected to the upper end of the fastening shell, an inner cylinder is provided between the sealing plate and the fastening shell, the inner cylinder is fixedly connected inside the fastening shell, a fastening rod is slidably connected to the fastening shell, the fastening rod is L-shaped, the short side of the fastening rod is located in the inner cylinder, the long side of the fastening rod is fixedly connected to a fastening sleeve, a roller is rotatably connected inside the fastening sleeve, and a guide tube is inserted between the roller and the side wall of the fastening shell.

7. A central venous catheter according to claim 6, characterized in that, A first elastic element is provided between the short side of the fastening rod and the side wall of the inner cylinder, and the two ends of the first elastic element are fixedly connected to the fastening rod and the inner cylinder, respectively.

8. A central venous catheter according to claim 7, characterized in that, A connecting slide rod is slidably inserted into the sealing plate. A rotating block is fixedly connected to the upper end of the connecting slide rod. A second elastic element is provided between the rotating block and the sealing plate. The second elastic element is sleeved on the connecting slide rod. The two ends of the connecting slide rod abut against the rotating block and the sealing plate, respectively. A fastening platform is fixedly connected to the lower end of the connecting slide rod; A lifting groove is provided on the lower surface of the sealing plate.

9. A central venous catheter according to claim 8, characterized in that, The fastening platform has an inverted trapezoidal cross-section.

10. A central venous catheter according to claim 8, characterized in that, The upper surface of the fastening platform is rectangular; The shape of the lifting groove matches the shape of the upper surface of the fastening platform.

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