Automatic exhaust and transfusion device and special blood-return-preventing liquid filter thereof

Abstract

The invention discloses an automatic exhaust and transfusion device, which comprises a bottle stopper puncture device, an upper catheter, a Murphy tube, a lower catheter with a regulator, a Ruhr joint and a venous scalp needle, wherein a blood-return-preventing liquid filter is arranged above or under the Murphy tube; and the blood-return-preventing liquid filter is used as follows: after most liquid flows away, liquid in the lower catheter continues to flow at a slow speed to enter into the blood vessels of a human body to generate a positive pressure state to the blood vessels of the human body. The blood-return-preventing liquid filter comprises an upper filter cover, a water storage tank, a lower filter cover and a base, wherein the upper filter cover and the lower filter cover are fixedly connected with the base, and a liquid-blocking filtering membrane is installed in the base; a support with a tank cavity is arranged above the liquid-blocking filtering membrane, and a leakage hole is formed in the middle of the bottom of the tank cavity of the support; the support is connected with the base, and a water leakage hole is formed in the bottom of the water storage tank; and a blood-return-preventing filtering membrane is fixedly arranged on the bottom of the tank cavity of the support. The automatic exhaust and transfusion device has the advantages of simple process, convenience in use and reliable function, and the working efficiency of medical personnel can be increased.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an automatic exhaust infusion device and a special blood return preventing liquid medicine filter. Background technique [0002] At present, there are two kinds of liquid medicine filters for existing infusion sets. One is a filter for a disposable infusion set, which is a straight filter. The upper connecting pipe is perpendicular to the upper filter cover, and the lower connecting pipe is perpendicular to the lower filter cover , generally placed in front of the venous needle of the infusion set, can only filter particles above 15 microns, the filter membrane is round, and the diameter is generally relatively small, generally not greater than 12.5mm; the other is a precision filter, which can filter 5 microns The above particles generally require a large enough filtration area, generally greater than 350mm2. Because the area is too large, in order to facilitate assembly...

AI Technical Summary

Problems solved by technology

[0003] At present, when the liquid in the infusion bottle of the existing infusion set has finished flowing, the liquid in the infusion set continues to flow until the venous pressure of the human body is balanced with the gravity of the medicine in the infusion set. The blood immediately flows into the catheter of the infusion set under the action of venous pressure. This phenomenon not only causes the panic of the patient, but also makes the nurse spend a lot of time re-exhausting, etc., and even causes rapid formation of thrombus, causing disputes between doctors and patients, etc.; in order to solve the above 问题,中国专利CN202113398U、CN201939817U、CN201912530U、CN201871070U、CN201759918U、CN201727806U、CN201727789U、CN201701561U、CN201668789U、CN201643241U、CN201643132U、CN201625277U、CN201414971Y、CN201414966Y、CN201414965Y、CN2666453Y、CN102309798A、CN101927041A、CN202151451U、CN202010326U、CN102294065A等类似专利,其 Either the principle of buoy blockage is used, or the principle of surface tension and gravity balance of the liquid filter membrane automatically seals the liquid medicine in the infusion set at a certain position of the infusion set, so that the liquid medicine below this position stops After flowing, the effect of automatic hemostasis is achieved. It is mistakenly thought that the gravity of the medicinal liquid below this position will generate positive pressure on the blood in the blood vessel to achieve the function of preventing blood return. In fact, this is not the case. When this position is automatically closed, The medicinal liquid below it is already in a state of complete weightlessness (losing gravity). At this time, the blood in the blood vessels of the human body connected to the infusion tube has the "diffusion effect" of the liquid itself, coupled with the effect of venous pressure, causing the blood to quickly dissipate. Backflow into the infusion tube, therefore, these patented products do not have the function of preventing blood return at all, thus failing to really solve the problem of doctor-patient disputes caused by blood return; Similar to the patent, either a drainage strip is used to introduce a small amount of residual liquid in the Murphy's tube into the front end of the scalp needle through the method of siphon suction to achieve the effect of preventing blood return, or it slowly leaks in through the tiny leakage hole. The blood vessels achieve the effect of preventing blood return. However, in actual use, there are several problems in using the drainage line to prevent blood return. First, the production process is relatively complicated, and the drainage line is a foreign body, which is objectionable when used in an infusion set. The second is through drainage because the liquid medicine flows from a low place to a high place through the drainage line. Due to the uncontrollable drainage line, the drainage effect is not good and the pass rate is not high. liquid gravity Therefore, sometimes it can’t help but be ideal, and the success rate of the product is not high; at the same time, in the actual use of products that use direct leakage hole leakage to achieve the anti-blood return function, due to the inaccurate control and production of the pore size, the leakage The flow rate of the liquid medicine cannot be controlled, and the tension of the liquid is too large due to the small diameter of the leakage hole, which either makes the residual liquid flow quickly or prevents the residual liquid from flowing, so that the product cannot achieve true anti-bleeding effect

To sum up, these two anti-bleed products are difficult to be reliable

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