This study is performed to analyze various aspects of biofilms on ureteral stents in a longterm setting.

The study is performed to provide a better understanding of the influence of biofilms on ureteral stents on the entire spectrum of stent-associated morbidity in a longterm setting.

In addition, the trial is intended to give an overview of the incidence of complaints, the occurrence of complications and their economic aspects.

The influence of biofilms on the morbidity associated with longterm ureteral stenting is assessed.

Inclusion Criteria:

• Patients with longterm indwelling ureteral stent (minimum of 2 months) undergoing regular changes
• Informed consent
• responsible patients

Exclusion Criteria:

• ongoing therapy: OAB, LUTS, urinary incontinence, chronic prostatitis, chronic pelvic pain syndrome
• insufficient language skills
• cognitive limitation

Patients with longterm indwelling ureteral stent undergoing regular changes in an inpatient or outpatient setting at the department of urology of KSSG.