Sack clamp venous indwelling needle with dual-pressure function

Abstract

The invention provides a sack clamp venous indwelling needle with dual-pressure function, which comprises an indwelling hose, an indwelling hose seat, a sack tube cap, a puncture needle tube and a puncture needle tube seat. The venous indwelling needle is characterized in that after infusion is completed and a connecting steel needle is removed, the indwelling hose seat is clamped by pressing the upper wall on the indwelling hose seat, so that the sac tube cap is flattened and deformed by extrusion of the roof and the pressure plate on the indwelling hose seat, and forms positive pressure in accordance with the direction of infusion; when the next infusion is started, the clamping state on the indwelling hose seat is opened, and negative pressure opposite to the direction of infusion is generated when the sac tube cap is restored by means of the characteristics of the sac tube cap; and the space variation generated by flattening and deformation of the sac tube cap is more than the internal space volume of the indwelling hose, and more than the volume of the connecting steel needle. Therefore, non-heparin tube sealing can be realized by utilizing the positive pressure, and whether the indwelling hose is plugged or not can be verified by utilizing the negative pressure.

Description

Technical field: [0001] The invention relates to a medical device for infusion of liquid, in particular to a sac card vein indwelling device with dual pressure function for infusion of liquid into the blood vessel during the venipuncture process and the indwelling period in the blood vessel after the puncture Needle. Background technique: [0002] Infusion can transport almost all medicinal liquids into the human body through blood vessels to achieve the purpose of treating and preventing diseases. In clinical practice, long-term infusion therapy of puncturing the blood vessels of patients is often used due to periodic treatment plans, such as chemotherapy for tumors, treatment of cardiovascular and cerebrovascular diseases, and poor conditions of blood vessels (hardening and fragility) in children and the elderly. Increase the difficulty of puncture and increase the pain of the patient being punctured, and may even be damaged by multiple punctures of the superficial blood ...

AI Technical Summary

Problems solved by technology

[0003] One is: in the process of using the indwelling needle for infusion, because most of them are connected by needles, when the connecting needle is pulled out, a certain negative pressure will inevitably be formed in the inner cavity of the indwelling needle, which will cause blood backflow into the indwelling needle tube and blood vessels. indwelling needle

Blood coagulation will occur to form emboli, which will block the indwelling needle channel and destroy the indwelling needle channel. When it is used next time, heparin must be used to seal the tube, which will virtually increase the financial burden of the patient.

[0004] The second is to increase the labor intensity of medical staff. In the process of using heparin to lock tubes, medical personnel need to follow certain operating procedures and considerable technical training. At the same time, some patients with blood clotting mechanism disorders cannot use it due to the risk of hemolysis and bleeding. Anticoagulant, its application is limited

Chinese patent: CN200620080001.2 discloses another method for automatically preventing blood reflux and overflow, which is to set a conductive support in the tail cavity of the indwelling needle seat, rubber seal the liquid flow channel, and use the conductive support (sleeve) in the Under the action of external force (infusion set or syringe or catheter socket), it penetrates and conducts again, but it does not explain how to break away from the infusion set and other sockets, and how to seal the structure again, so this technical solution only Can meet the only one-time use of the indwelling needle and the liquid line interface

[0006] At present, there is no known technology of such a simple and functional venous indwelling needle disclosed

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