RecruitingRenal Stones
RETRO Study (RETrograde Renal Access Outcomes)
Eligible age
18+ yrs
Accepts
All genders
Locations
2 states
Healthy volunteers
No
See if you qualify for this study
Answer a few quick questions about your location and health. Takes about a minute.
About this study
The goal of this observational study is to learn about the benefit of using RetroPerc® in obtaining renal access for percutaneous nephrolithotomy. The device is already used in routine clinical practice by urologists around the country. Participants who are already scheduled to undergo percutaneous nephrolithotomy as part of their regular care will be asked to participate.
Sponsor: University of Kansas Medical Center
You may qualify if…
- ✓ Renal stone or total linear sum of 1.5-3cm cm in maximum dimension (largest diameter in axial or coronal)--- multiple stones should be summed to determine stone size.
- ✓ Age \>=18 years of age
- ✓ Gender: both men and women included.
- ✓ Ethnic background: all ethnicities will be included in the study population and the specific ethnic diversity present in the study population will reflect the geographic distributions of the participating institutions.
- ✓ Plan for PCNL in the supine position
You may not qualify if…
- ✕ Active pregnancy
- ✕ BMI \>45
- ✕ Severe Hydronephrosis - renal pelvis diameter \> 20mm
- ✕ Flank window \< 4 cm are ineligible for puncture
- ✕ Previous ipsilateral PCNL
- ✕ Currently with "useful" nephrostomy tube on ipsilateral side
- ✕ Uncorrectable coagulopathies
- ✕ Untreated urinary tract infection
Where it's recruiting
Source: ClinicalTrials.gov · NCT07071831 · last updated 2026-05-04