Passage of a CATHETER into the URINARY BLADDER or kidney.

Catheters inserted into the URINARY BLADDER or kidney for therapeutic or diagnostic purposes.

Inflammatory responses of the epithelium of the URINARY TRACT to microbial invasions. They are often bacterial infections with associated BACTERIURIA and PYURIA.

Catheters designed to be left within an organ or passage for an extended period of time.

Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.

Use or insertion of a tubular device into a duct, blood vessel, hollow organ, or body cavity for injecting or withdrawing fluids for diagnostic or therapeutic purposes. It differs from INTUBATION in that the tube here is used to restore or maintain patency in obstructions.