Automatic air discharging system of infusion device capable of preventing blood return

Abstract

The invention discloses an automatic air discharging system of an infusion device capable of preventing blood return. The automatic air discharging system comprises a nozzle, a first air filter, a second air filter, a sealing plug and an air discharging pipe, and is characterized in that: the nozzle is located at the upper end of a dripping hopper cavity; the air discharging pipe is arranged in the dripping hopper cavity; a first end of the air discharging pipe is connected with the first air filter, and a second end of the air discharging pipe is connected with a dripping hopper wall and is provided with the sealing plug; a first waterproof air filtration membrane in the first air filter is located in a central region of a cylindrical cross section of a dripping hopper, and the highest point of the first waterproof air filtration membrane is located between 1 / 2 to 2 / 3 height of a dripping hopper pipe; and the second air filter provided with a second waterproof air filtration membraneis arranged between a lower infusion pipe and an external conical joint. According to the air discharging system and a special structure thereof, the air can be rapidly discharged automatically no matter whether the dripping hopper is in a violent shaking environment or not; when the dripping hopper is inclined or swung and air discharge is finished, the dripping speed can be persistently and well observed; and air entering the lower infusion pipe can also be automatically discharged.

Description

【Technical field】 [0001] The invention relates to an automatic exhaust system for a one-time use anti-blood infusion set, especially suitable for the anti-blood infusion set. 【technical background】 [0002] The current automatic exhaust system for preventing blood return infusion sets either installs an air filter or a filter with a sealing plug outside the side wall of the dripping funnel, or installs an extension on the dripping funnel cover and connects a dripping drip below. The air filter for the exhaust needle inside the bucket. In order to prevent the infusion solution in the drip funnel from overflowing during exhausting, the air filter membrane in the air filter must be of a water-proof type. Although they can realize the automatic and rapid exhaust of the dropping funnel under normal circumstances, when the dropping funnel is exhausted in an environment of intense vibration, a large number of air bubbles will be generated due to the infusion in the dropping funnel...

AI Technical Summary

Problems solved by technology

In this way, the drip funnel may not be able to observe the drip speed

In this way, the exhaust system without a sealing plug cannot effectively control the position of the gas-liquid interface, and this is still a defect that cannot be ignored

Even if the exhaust system has a sealing plug, the position of the gas-liquid interface can be monitored during exhausting, and the sealing plug should be plugged in time to prevent the dropping funnel from losing the function of observing the dripping speed, but the operation is not simple enough

[0004] In addition, in each of the above-mentioned exhaust systems, there is no component for removing the air entering the lower infusion tube. Once the anti-blood return infusion set is improperly operated and the lower infusion tube is inhaled, this part of the air will follow if it is not excluded. The infusion enters the vein to produce thrombus and cause harm to the human body

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