I-form arteriovenous indwelling needle with positive pressure function

Abstract

The invention provides a type I AV vein detained needle having positive pressure function which comprises a puncture needle, a puncture needle seat, a vein detained needle hose, a nail head, a vein detained needle seat, a connecting tube, a positive pressure spring, a sealing cap, a seal ring, a piston, a seal ring piston, and a positive pressure casing. The positive valve structure in the form of the piston and the conventional I-shaped detained needle are organically combined by adopting the structural design of a cross channel (when the puncture needle is present) and a T-shaped channel (when infusion and retention are carried out) arranged in the piston. A liquid channel during infusion comprises an inner cavity between a pair of arc plates on the piston and between the piston and the middle part of a positive pressure casing, a T shaped channel on the piston, the connecting tube, the nail head and the vein detained needle hose. An air channel can be several gaps at lower section of the positive pressure casing. The piston moves in upper and lower directions in the positive pressure casing, and a positive pressure is generated by the difference between the upper section diameter and the lower section diameter of the piston, and upward stroke thereof. The type I AV vein detained needle has small volume and light weight, and is easily fixed and carried, which facilitates popularization.

Description

technical field [0001] The invention relates to a medical instrument for infusion of liquid, in particular to an arteriovenous indwelling device with positive pressure function for infusion of liquid into the blood vessel during the arteriovenous puncture process and the intravascular indwelling period after the puncture. Needle. Background technique [0002] Infusion can transfer almost all medicinal liquids into the human body through blood vessels to achieve the purpose of treating and preventing diseases. In clinical practice, arteriovenous indwelling needle (tube) technology has been widely used in order to avoid the damage of blood vessels caused by multiple punctures and reduce the pain of patients, and also to reduce the operating intensity of nurses. The arteriovenous indwelling needle of clinical use is mostly made up of heparin (sealing) cap, puncture needle, puncture needle holder, indwelling needle flexible pipe, indwelling needle holder, indwelling needle prot...

AI Technical Summary

Problems solved by technology

This not only increases the operating procedures of medical staff, but also increases the financial burden of patients, and because some patients with blood coagulation mechanism disorders cannot use anticoagulants due to the risk of hemolysis and bleeding, their application is limited;

[0005] The third is: in the process of infusion and anticoagulant sealing of indwelling needles, acupuncture connections are required, which not only increases the workload and labor intensity of nurses, but also increases the risk of accidental injury of medical staff by needles

Chinese patent: CN200620080001.2 discloses another method for automatically preventing blood reflux and overflow, which is to install a sealing plug and a conducting bracket in the tail cavity of the indwelling needle seat, the rubber sealing plug seals the liquid flow channel, and the conducting bracket ( Sleeve) penetrates the sealing plug under the action of external force (infusion set or syringe or catheter socket), and conducts again, but it does not explain how the conductive support is separated from the sealing plug after the socket of the infusion set is pulled out, and is sealed again Therefore, this product can only meet the one-time use of the indwelling needle and the liquid pipeline interface

[0008] 1. In the process of pulling out the puncture needle after successful vascular puncture, it cannot effectively prevent the blood from spilling out of the needle channel, which may cause pollution or cross infection;

[0009] 2. The puncture needle tip protection device is incomplete or unreasonable

As in the above-mentioned published patent, the needle tube is made of an enlarged ball, although it is enough to limit the shedding of the protective sleeve, but there is resistance or obstacles in the process of inserting the needle tube into the indwelling needle hose and the needle seat

[0010] 3. There is no positive pressure device to prevent coagulation, and heparin is required for anti-coagulation sealing tubes;

[0011] 4. If there is no needle-free connection device, acupuncture connection is required to ensure the need for re-infusion;

However, because the generation of its positive pressure function relies on the structure of the stent and the balloon, the implementation of this technical solution is not conducive to the popularization of the grassroots due to the complex structure and high cost.

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