Positive-pressure continuous liquid supply device, venous indwelling needle and central venous catheter

Abstract

The invention belongs to the field of medical instruments, and relates to a positive-pressure continuous liquid supply device. The positive-pressure continuous liquid supply device comprises a positive-pressure liquid storage bag and a joint, wherein the positive-pressure liquid storage bag is made of elastic material; a one-way medicine adding opening and a medicine outlet are formed in the positive-pressure liquid storage bag; the medicine outlet is connected with the joint through a flow limiting tube. The positive-pressure continuous liquid supply device can provide continuous positive pressure and realize continuous liquid supply; during the liquid supply process, the output speed and output amount of medical liquid can be limited through the flow limiting tube to guarantee the fact that the infusion time (namely the liquid supply time) for injecting medical liquid through the positive-pressure liquid storage bag is within the planned time range; the device is suitable for medical instruments requiring intravenous indwelling, and is wide in application range. The invention further relates to a venous indwelling needle provided with the positive-pressure continuous liquid supply device and a central venous catheter provided with the positive-pressure continuous liquid supply device. The venous indwelling needle and the central venous catheter have the effects of the positive-pressure continuous liquid supply device, and further have the advantages of being capable of preventing reverse flow of blood, preventing thrombus, avoiding sealing tube, and avoiding flushing tube.

Description

technical field [0001] The invention relates to a positive pressure continuous liquid supply device, a venous indwelling needle and a central venous catheter, belonging to the field of medical devices. Background technique [0002] Disposable venous indwelling needles and central venous catheters used clinically in clinical units of various domestic medical institutions require venous indwelling. [0003] Taking the traditional venous indwelling needle as an example, the working process of the venous indwelling medical device is explained as follows: The traditional venous indwelling needle mainly consists of a heparin cap, a protective cap, an infusion tee, a PVC hose, a water-stop clip, a puncture needle seat, and an indwelling needle. It consists of a cannula seat, a hemostat, a puncture needle, an indwelling needle sleeve, and an indwelling needle sheath. The disposable venous indwelling needle uses the sharpness of the puncture needle to smoothly puncture the skin and ...

AI Technical Summary

Problems solved by technology

However, in the actual application process, the blood often enters the indwelling needle sleeve due to the movement of the patient and the infiltration of blood. It is easy to cause blood to form embolism in the blocked blood vessel during circulation, which will bring great harm to the patient and even threaten life

At present, in order to prevent blood coagulation, patients can be injected with heparin sodium and other anticoagulant drugs, but patients who are allergic to heparin sodium and other anticoagulant drugs cannot use it; normal saline can also be used for locking the tube, but the locking time is limited and requires Repeated tube sealing, in addition, improper operation by nurses can easily cause tube blockage

Now, there are positive pressure connector devices on the market, as well as techniques such as placing fine fibers in the tube for drainage, but the positive pressure formed by these is one-time, and it is completely released within 10 seconds. It cannot provide continuous positive pressure, and it is still easy. Blocking the tube, how to solve the coagulation in the tube to prevent blood clots is a difficult problem to be solved at present

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