Central venous catheter with wall adherence preventing device for dialysis

Abstract

The invention discloses a central venous catheter with a wall adherence preventing device for dialysis. The central venous catheter comprises a catheter body, an outlet, a blood inlet and a blood outlet, an air bag which is close to the blood inlet is sleeved at a position of the upper portion of the blood inlet, the air bag comprises an air bag body and an air bag channel which is connected with the air bag body, the other end of the air bag channel extends to a position of the outlet of the upper end of the catheter to form an air vent, and the air bag body comprises at least three same air bag pouches which are uniformly distributed on a same horizontal plane. By means of the central venous catheter with the wall adherence preventing device for the dialysis, the problems that the blood inlet adheres to the wall when a dialysis catheter is placed in vein for a long time, and wall adherence can occur due to conditions of low blood pressure and the like of critically ill patients can be excellently solved, when blood flow is blocked caused by the fact that a fibrin sheath forms and wraps the tip end of the catheter, the air bag is opened to open up the fibrin sheath, thereby a part of space is reserved to enable blood to pass, the manufacturing process is simple, the cost is low, and the clinical practicability is high.

Description

technical field [0001] The invention relates to a venous catheter, in particular to a central venous catheter for dialysis. Background technique [0002] Dialysis catheters are an essential medical device during hemodialysis. Common dialysis catheters are divided into single-lumen catheters, double-lumen catheters, and triple-lumen catheters according to the number of lumens in the catheter. A typical double lumen dialysis catheter structure is as follows: figure 1 As shown, it includes a catheter body 1 , two independent outlets 2 at the upper end of the catheter body 1 , a blood outlet 3 (tip) at the lower end of the catheter body 1 and a blood inlet 4 at the lower side wall of the catheter body 1 . [0003] Some dialysis patients need to indwell a double-lumen dialysis catheter in central veins such as internal jugular vein and femoral vein for dialysis. However, after this kind of catheter has been used for a long time, sometimes it will stick to the wall, that is, th...

AI Technical Summary

Problems solved by technology

There is a laser grooving process used in catheter production, which can reduce the occurrence of wall adhesion to a certain extent, but it is still not ideal in clinical application, and the process requirements are high and the price is expensive

[0004] In addition, after the central venous catheter has been placed for a long time, a fibrin sheath will be formed between the catheter tip and the side wall, that is, between the blood outlet and the blood inlet. This fibrin sheath wraps the blood inlet of the catheter side wall (fibrin sheath It is wrapped between the inlet and the outlet, wrapped like a sock, the main problem is to block the blood inlet), resulting in the inability of the blood to be drawn out smoothly, and the blood flow is poor. How to prevent and deal with the formation of this fibrin sheath, first of all, in the After the protein sheath is formed, urokinase is used repeatedly for thrombolysis, but urokinase thrombolysis cannot dissolve the fibrin sheath, but can only dissolve some microthrombi in the fibrin sheath, thereby releasing a little space for blood to pass through

Repeated thrombolysis with urokinase also has its risks: 1. It is expensive. Thrombolysis is required before each dialysis, which takes a long time and is very troublesome, and the patient cannot afford it. 2. Urokinase has complications of systemic hemorrhage, which is life-threatening. complication of cerebral hemorrhage

The second is to use the fibrin sheath avulsion technique to pull out the fibrin sheath, but this operation is difficult, and it is not easy to carry out in general hospitals, and the operation needs to be performed under contrast, which is expensive

[0005] Thirdly, some critically ill patients often suffer from hypotension and poor vascular tone. At this time, the blood vessels are easily attached to the blood inlet of the catheter side wall after being sucked by the negative pressure on the side wall of the catheter, resulting in poor blood drainage, and thus unable to complete dialysis smoothly. , a threat to the patient's life

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