Safety venous indwelling needle with needleless interface positive-pressure closing valve

Abstract

The invention discloses a safety venous indwelling needle with a needleless interface positive-pressure closing valve, comprising a puncture needle, a puncture needle seat and a handle, wherein, the puncture needle is formed into a puncture needle protection assembly by a puncture protection sleeve, a spring, a plunger latch and an escapement clamp; a venous indwelling needle is formed by an indwelling needle soft tube, a puncture needle guide tube, an indwelling needle seat and a sealing plug; a needless interface positive-pressure closing valve is formed by a shell, a piston, a seal ring, a spring, a connecting soft tube and a base; the positive-pressure closing valve and a liquid out plug separated structure do not involve the indwelling needle, are easy to operate, can reduce pain, and avoid the indwelling needle from taking off; the puncture needle protection sleeve can protect the puncture needle before and after the use of the indwelling needle, has the advantages of without added length, small and exquisite volume, good hand feel, accurate control, high puncture precision, and convenience for puncture operation and the like, can automatically retract to protect the puncture needle, can avoid acupuncture injury on medical workers, has positive pressure closing function, can prevent venous blood flowing back and overflowing, prevent blood from being polluted and avoid the blood from forming blocking in the indwelling needle, does not need heparin tube closing and other operation, has needless connection function, and can avoid needle injury, improve working efficiency and protect the safety of medical workers and patients.

Description

technical field [0001] The invention relates to a medical device for infusion of liquid, in particular to a positive pressure airtight valve with a needle-free interface for infusion of liquid into blood vessels during arteriovenous puncture and during the indwelling period in blood vessels after puncture safe arteriovenous indwelling catheter. 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, blood vessels are often punctured multiple times for infusion therapy due to periodic treatment plans. When chemotherapy for tumors, treatment of cardiovascular and cerebrovascular diseases, and poor puncture conditions for blood vessels (hardening and fragility) in children and the elderly, the blood vessels are damaged due to multiple punctures, or the patient does not cooperate, which will increase the pain of the patient and the...

AI Technical Summary

Problems solved by technology

[0003] One is: there is a safety risk for users and surrounding personnel: since the metal puncture needle needs to penetrate the indwelling needle, its length is longer than that of ordinary puncture needles. After the puncture is pulled out, there is no protection on the outside, which is likely to cause medical staff and future medical waste. Handlers are injured by needles, and there is a risk of nosocomial infection caused by viruses contained in blood stains remaining on needle tubes

[0004] The second is: there is a safety risk to the patient and the surrounding personnel: since the indwelling needle base has the same structure as the ordinary puncture needle base, there is no measure or device to prevent blood backflow (reflux), so that after the puncture needle is pulled out, the blood will flow back and pollute the environment (medical staff and the surrounding population) human body, forming a safety risk; moreover, in the process of repeated infusion with the indwelling needle, the action of pulling out the infusion connector after each infusion will inevitably form a certain negative pressure in the inner cavity of the indwelling needle, which will cause Cause blood backflow into the indwelling needle tube, blood coagulation will occur, and embolus will be formed. When it is used again, because the indwelling needle channel is blocked, it needs to be punctured again, which will affect the treatment and increase the labor of medical staff; moreover, if the embolus enters the blood vessel, then It will enter different tissues or organs of the human body with the blood flow, causing embolism of blood vessels in the tissue or organ, and can cause ischemia and necrosis of the organ in serious cases, with very serious and dangerous consequences

[0005] The third is: increase the labor intensity of medical care, the operation is cumbersome, and after the embolism occurs, it needs to be punctured again, which will increase the pain and burden of the patient and limit its application

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 and sealed again after the socket of the infusion set is pulled out Therefore, this solution can only meet the one-time use of the indwelling needle and the liquid pipeline interface

Chinese patent: CN200510051051.8 discloses a method of safely indwelling the needle, which is to make an enlarged needle body at the front end of the puncture needle, so as to limit the slipping of the needle tip protection sleeve on the needle body in the front section of the needle tip, and protect the needle tip solution; because it only protects the needle tip, and the needle body is still exposed, the blood stains on the needle body are still a serious source of infection for medical staff

Its advantage is that it overcomes the problem of embolism caused by venous return and shields the needle tip, avoiding the risk of needle stick injury. However, there are also some shortcomings: that is, although the puncture needle tip is shielded, the puncture needle body is still exposed, which is different from the needle tip. B.Braun's technical protection scheme also has the risk of blood stains on the needle body contaminating the human body

[0007] Chinese patents CN200620076287.7 and CN200720018504.0 disclose two kinds of indwelling needles with positive pressure airtight valves. Although they solve the blood backflow phenomenon when the puncture needle is pulled out, they cannot solve the problem of needle stick injury

[0008] None of the technical solutions disclosed above solves the fundamental problems existing in the indwelling needle at present, or there are certain inconveniences and deficiencies in the clinical operation process:

[0009] 1. In the process of pulling out the puncture needle after successful vascular puncture, it cannot effectively prevent blood from spilling out of the needle channel, which may cause contamination or cross-infection risks

[0010] 2. The puncture needle tip protection device is not perfect 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

[0011] 3. After the socket of the indwelling needle is plugged into the socket of the infusion set or syringe or liquid infusion device for infusion, after the socket is pulled out, the negative pressure of the blood in the blood vessel due to the pullout of the socket will cause the blood to flow back, and the blood will flow into the indwelling needle and become soft. The tube coagulates and the indwelling needle is blocked, resulting in inability to re-infusion. In severe cases, the blood clot falls off and enters the blood vessel. With the blood flow, it will cause venous embolism in small blood vessels, causing ischemic necrosis of some tissues or organs, and causing serious consequences.

[0012] 4. The front-end protection scheme of the metal clip and protective cap can only protect the needle tip and eliminate needle stick injuries, but it cannot completely shield the needle body, and there is a risk of blood stain contamination

[0013] 5. The method of adding a complete protective sleeve at the end of the puncture needle seat (the side of the sheath tube is slit, which is beneficial to the withdrawal of the puncture needle), although the puncture needle can be completely protected, but due to the increase in product volume and length, the The puncture needle body and the sheath tube interfere with the clinical operation process, increase the product packaging volume and increase the product cost, especially the bad hand feeling and inconvenient operation, which affect the puncture accuracy

However, because the puncture needle protection scheme uses a spring to release the elastic force of the protective sleeve and shield the puncture needle, there is also the risk of contamination of others by the blood-stained body fluid contaminated by the needle tube body. Therefore, this scheme can only prevent needle sticks damage, but cannot achieve real and thorough safety protection

Images