Please assess the completion status of the following clinical trial:

Trial Title: Clinical Evaluation of BackStop in Patients Undergoing Ureteroscopic Lithotripsy

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: SINGLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* patient with solitary ureteral stone ranging from 5mm to 15mm diameter~* able to tolerate general anesthesia~* clinical indication for treatment by ureteroscopic lithotripsy~* must be willing and able to participate in any follow-up visits~* provide informed consent~* have a CT scan demonstrating the stone~Exclusion Criteria:~* patients undergoing extracorporeal shock wave lithotripsy (ESWL) or any other extracorporeal or percutaneous lithotripsy procedure as primary procedure~* any co-morbidity or condition that would necessitate exclusion of patient (physician opinion)~* renal or ureteral anatomical abnormality~* multiple stones in the indicated ureter~* stones in the indicated kidney~* patient is immunocompromised~* multiple organ dysfunction syndrome~* has an absolute or relative solitary kidney mass~* \>= Stage 3 chronic kidney disease~* bilateral ureteral obstructing stones~* staghorn calculi~* impaction of several stone fragments (Steinstrasse)~* uncorrected coagulopathy/thrombocytopenia~* urethral and/or ureteral stricture~* reconstructive urinary surgery

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- BackStop (Type: EXPERIMENTAL): Patients randomized to the Experimental arm will receive the BackStop gel during their ureteroscopic lithotripsy to prevent retrograde migration of stones or stone fragments.
- Control (Type: NO_INTERVENTION): Patients randomized to the control group will not use any devices to prevent retrograde migration of stones and stone fragments during their ureteroscopic lithotripsy.

Based on this trial design, predict the completion outcome and termination type (if applicable).