Automatic-exhaust anti-blood-return infusion device and medical infuser thereof

Abstract

The invention discloses an automatic-exhaust anti-blood-return infusion device, which comprises a barrel, a barrel head tightly covering the barrel, a water inlet pipe, a water outlet pipe, a vertical limit frame with two open ends, a buoy and an elastic diaphragm, wherein the water inlet pipe penetrates through the barrel head and is communicated with the barrel; the water outlet pipe penetrates through the bottom of the barrel and is communicated with the barrel; the barrel head is provided with at least one vent hole which is tightly covered by a waterproof hydrophobic filter membrane; the vertical limit frame is fixed on the barrel and a gap is formed between the vertical limit frame and the inner wall of the barrel; the buoy is just clamped in the vertical limit frame, and only can move vertically; and the elastic diaphragm is tightly adhered to the bottom of the buoy, and is attached to the upper port of the water outlet pipe after the buoy sinks. The invention also discloses a medical infuser of the device. The device and the medical infuser are simple in manufacturing process, reliable in performance and convenient to use, automatically exhaust, can radically prevent blood return, and are easily molded.

Description

technical field [0001] The invention relates to an infusion device, in particular to an automatic exhausting and anti-blood-return infusion device; the invention also relates to a medical infusion device with an automatic exhausting and anti-blood-returning infusion device, belonging to the field of medical equipment. Background technique [0002] At present, many patents for infusion sets with automatic hemostasis and anti-return of blood have been published at home and abroad, most of which feature a device similar to a one-way valve at the bottom of Murphy's tube (for example: CN202010326U CN101927041ACN2666453Y CN201414965Y CN201625277U CN201643112U CN201668789U23UC7901561 CN202161624U CN2546037Y ZL94219401.2 CN201079597Y CN276374YCN201978273U CN101579549 etc.), when the liquid flows out during the infusion, the one-way valve at the bottom of Murphy's tube automatically sinks to block the water outlet of Murphy's tube, so that the liquid flowing into the lower tube stops ...

AI Technical Summary

Problems solved by technology

[0002] At present, many patents for infusion sets that automatically stop liquid and prevent blood return have been disclosed at home and abroad, most of which are characterized by: a device similar to a one-way valve is arranged at the bottom of the Murphy's tube (for example: CN202010326U CN101927041ACN2666453Y CN201414965Y CN201625277U CN201643112U CN201668783UCN108U526 CN202161624U CN2546037Y ZL94219401.2 CN201079597Y CN276374YCN276374YCN201978273U CN101579549 etc.), when the liquid medicine flows out during infusion, the one-way valve at the bottom of the Murphy's tube sinks automatically to block the outlet of the Murphy's tube, so that the downcomer enters the liquid and stops flowing. I mistakenly think that this can achieve the effect of automatic hemostasis and prevent blood return. In fact, the article "Research on the Position of the Regulator and Blood Return During Infusion" in "Southern Nursing Journal, Volume 2, Issue 1, 1995" has already explained that when this one-way After the valve closes the downcomer, the liquid below is in a state of complete weightlessness (similar to the closed state of the regulator in the article). Due to the effect of human venous pressure and the mutual diffusion of the liquid, the blood will flow back into the infusion set, so It cannot achieve the effect of preventing blood return, which will cause thrombosis more easily; if the anti-blood return effect in the true sense must be maintained when the liquid medicine is about to run out, a small amount of liquid medicine can maintain a slow infusion state; based on this Principle, the Chinese patent CN20206763U designs a two-way increase under the buoy, so that a small amount of residual liquid medicine is added after the liquid is stopped, and then the slow flow of the liquid medicine is realized through the micropores of the two-way and the fiber rope inside, and the slow infusion state is maintained. So as to achieve the effect of anti-bleeding, although the effect is very good, but the production process is complicated and the existence of foreign matter, the foreign matter is prohibited in the infusion set, this patent cannot realize the usable product; It achieves the effect of relatively automatic liquid stop, but due to the surface tension of the filter membrane, the liquid stop height of the infusion set is seriously affected, and the state of the infusion is more complicated, so the effect of automatic liquid stop is not good; at the same time, the patent sets A drainage strip introduces a small amount of residual liquid into the front end of the scalp needle through the method of rainbow suction to achieve the effect of preventing blood return. The design of this drainage strip is relatively easy, the manufacturing process is difficult to shape, the manufacturing cost is relatively expensive, and it is difficult to scale; It is difficult for a patented product to become a real practical product

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