Device for preventing blood return and infusion device for preventing blood return

Abstract

The invention belongs to the field of medical devices, and discloses a device for preventing blood return. The disclosed device for preventing blood return comprises a check chamber, a liquid inlet pipe, a liquid outlet pipe, a liquid blocking plate, a liquid passing hole and an elastic valve, wherein the middle part of the check chamber protrudes outwards into a columnar shape and is provided with the liquid blocking plate, the liquid blocking plate is provided with the liquid passing hole and a valve fixing bracket, the elastic valve is fixed to the valve fixing bracket to cover the liquid passing hole, divides the check chamber into two cavities without air circulation, and elastically deforms as medicine liquid flows out to open in one direction so as to ensure the normal flow of the medicine liquid, and when the pressure difference disappears, the elastic valve can recover in time to block the liquid passing hole. The invention also discloses an infusion device for preventing blood return. By using the device for preventing blood return and the infusion device for preventing blood return, the design defects and risks in the prior art can be effectively avoided. On one hand, the pressure on families of patients and medical staff, and other hand, the health of patients is ensured. Moreover, the device has the advantages of simple structure, low cost, safety and reliability,and at the same time, the device has no pollution to the environment, which is conducive to environmental protection, so the device has great application and promotion significance.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to an anti-blood return device and an anti-blood return infusion set. Background technique [0002] At present, the infusion method commonly used in hospitals is gravity infusion. Due to the gravity of the medicinal liquid itself, the hydraulic pressure of the medicinal liquid is higher than that of the human veins, ensuring that the medicinal liquid enters the patient's blood. However, when the fluid pressure is lower than the venous pressure during the infusion or when the liquid medicine is infused or self-stopped, if the flow rate regulator is not closed in time or the needle is pulled out, the patient's venous blood will flow back into the infusion tube, resulting in Hemorrhage phenomenon. Once the blood returns, it will frighten the patient and cause the patient's worry and uneasiness, and it will cause the blood flowing back into the infusion set to coagulate int...

AI Technical Summary

Problems solved by technology

In this solution, the periphery of the elastic barrier is connected to the inner wall of the liquid inlet. Obviously, in order to ensure the circulation of the liquid medicine, the periphery of the barrier is partially but not completely fixed on the inner wall of the liquid inlet. At this time, it is necessary to deform the barrier sheet through pressure so that the unfixed edge of the barrier sheet leaves the liquid opening to form a gap to ensure the passage of the liquid medicine. Obviously, in this scheme, since part of the edge of the barrier sheet is fixed on the liquid inlet On the inner wall, the elastic deformation of the unfixed edge requires greater pressure. Such a greater pressure will also cause a large area of ​​deformation in the middle of the barrier. Since the liquid medicine slowly flows into the human body during the infusion process, the water column pressure and When the pressure difference of the venous pressure is small, the generated force is difficult to cause the effective elastic deformation of the barrier sheet. In order to have a more obvious deformation of the barrier sheet, it is necessary to increase the flow rate, which has a certain risk in clinical application; When the difference disappears, because the recovery of the large area of ​​deformation in the center of the barrier sheet will cause a certain amount of liquid medicine to be backfilled, there is also a risk of a small amount of blood returning

[0006] In summary, there are obvious defects and risks in the clinical application of the anti-reflection solutions in the prior art. In view of this, how to improve the structure of the anti-reflux infusion connector in the prior art to overcome the above-mentioned defects is an important issue. An unresolved technical problem in the field

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