34results about How to "Prevent retrograde infection" patented technology

The invention discloses a urinary catheter which can adjust the opening size of the head end. The rear section is provided with an adjustment switch that can adjust the expansion and contraction of the guide wire. When inserting the catheter, the opening at the head end can be adjusted slightly smaller, and after indwelling, the opening can be adjusted larger or closed as needed. The invention adds the function of adjusting the size of the opening on the basis of the traditional urinary catheter, which facilitates drainage after the opening is enlarged, and prevents blood clots or tissue blocks from blocking the catheter; and can replace the traditional external clamping catheter by closing the opening at the head end. urinary catheter, thereby preventing retrograde infection of the urinary catheter. The invention has the advantages of simple structure, convenient manufacture and easy use.

The invention relates to the field of medical materials, in particular to a silver-loaded biliary tract stent with multiple layers of film coatings, which comprises a biliary tract stent body, wherein a multiple layers of film coatings which are alternately arranged according to chitosan nano silver layers and heparin layers are coated on the surface of the biliary tract stent body, the total layer quantity of the multiple layers of film coatings is not less than 4, and the total thickness of the multiple layers of film coatings is between 100 and 2000nm. The invention also provides a preparation method of the silver-loaded biliary tract stent with multiple layers of film coatings, which comprises the steps of: dip-coating the biliary tract stent body in a heparin solution and then dip-coating in a chitosan-loaded nano silver solution, and circularly repeating the steps. The silver-loaded biliary tract stent with multiple layers of film coatings, prepared by utilizing the preparation method disclosed by the invention, has the functions of resisting bacteria, virus and mycete; and due to the adoption of the silver-loaded biliary tract stent, the unobstructed period of the biliary tract stent can be prolonged and the inverse infection of the biliary tract can be prevented.

The invention relates to a backflow-prevention anti-blocking drainage device with a large suction amount. The drainage device comprises a liquid inlet valve body (1), a liquid inlet valve core (2), a liquid inlet valve spring (3), an upper valve cover and a lower valve cover (4 and 10), a needle cylinder piston (5), a piston rod (6), a liquid discharging valve body (7), a liquid discharging valve core (8) and a liquid discharging spring (9), wherein the liquid inlet valve core (2) only allowing a liquid to flow downwards is arranged in the liquid inlet valve body (1), and an insertion hole for a liquid inlet pipe (11) is formed in the upper left part of the liquid inlet valve body (1); the liquid discharging valve core (8) only allowing the liquid to flow leftwards is arranged in the liquid discharging valve body (7); and an insertion hole of a liquid discharging pipe (13) and a duct allowing the needle cylinder piston (5) to move leftwards and rightwards are formed in the left side and in the upper right part of the liquid discharging valve body (7) respectively. The needle cylinder piston (5) moves leftwards and rightwards continuously, so that the liquid can be drained and discharged to a container. The backflow-prevention anti-blocking drainage device with a large suction amount has the advantages as follows: smooth drainage is realized, the drainage amount is large, retrograde infection of the liquid is prevented, blocking is avoided, and continuous drainage can be realized.