2results about How to "Prevent elution" patented technology

The application relates to the technical field of medical devices, in particular to a balloon for vascular access intervention, which comprises an outer catheter, a cleaning pipe and a telescopic hose, one end of the outer catheter is provided with a guide wire connecting port, the cleaning pipe is arranged on the guide wire connecting port, and a guide head is fixedly connected to the end of the outer catheter far from the guide wire connecting port; medicine is smeared into a medicine applying groove, the medicine in the medicine applying groove will be attached to the inner wall of the blood vessel of a patient after the balloon body is inflated, covers the wound, avoids the elution of the medicine when the balloon body moves, and improves the use rate of the medicine.

This invention discloses a method for preparing a cross-shaped nanostructured PtCu alloy catalyst and its application, belonging to the field of electrocatalysis and fuel cell technology. The method involves sequentially adding an aqueous solution of chloroplatinic acid and a copper chloride solution to a reaction vessel, followed by the addition of a reducing agent and a dispersant. The mixture is then fully dissolved by ultrasound and stirring, and after homogenization, heated under an inert atmosphere. After the reaction, the catalyst is centrifuged, washed, and freeze-dried to obtain a PtCu alloy catalyst with a cross-shaped nanostructure. This invention uses an aqueous phase system, avoiding the use of macromolecular organic solvents, thus fundamentally solving the problems of the synthesized product being easily encapsulated by organic matter and the active sites being difficult to expose in traditional methods. Furthermore, the nanostructured catalyst obtained through aqueous phase synthesis has a clean surface, allowing for full exposure of the catalytic active centers and effective contact with the reactants, thereby significantly improving the electrocatalytic performance of the catalyst.