All patients will be randomized into 2 groups:~Direct puncture - patients who underwent directive puncture under ultrasound or Rg control. The number of patients is 30 people.~Non-direct puncture - patients who underwent a PCS puncture with retrograde contrast. The number of patients is 30 people.~Patients will be assigned a randomization number that matches their treatment. Block randomization using 10 blocks will be performed by a central randomization organization (www.randomize.net) using a computerized algorithm.~Primary assessed indicators:~Gender~Age~Body mass index~Localization of the stone (side, pelvis, upper anterior cup, upper posterior cup, middle anterior cup, middle posterior cup, lower anterior cup, lower posterior cup)~Density of the stone~The presence of hydronephrosis~Indicators assessed during the operation - will be assessed by the physician-researcher:~Installation of the ureteral catheter~Duration of puncture~Puncture method (ultrasound, X-ray)~The success of the insertion of a flexible guidewire into the calyceal system~Problems during dilation of the puncture course~Visualization (Excellent, Moderate, Poor)~Type of drainage (stent, nephrostomic tube) at the end of the operation Using the Visual Analogue Pain Scale (VAS), pain assessment is planned at 2 hours, 6 hours, 12 hours and 24 hours after surgery.~In the postoperative period, the patient independently controls the intake of analgesics from the NSAID group (ketorolac 100 mg) (Patient-controlled analgesia). If the patient requires analgesics, the time of taking the drug will be recorded (pain relief on demand).~Secondary Assessment: Postoperative Assessment~Complications (Clavien)~Hemoglobin level 24 hours after surgery~Creatinine level 24 hours after surgery~Assessment of Stone-Free status after surgery by performing multislice computed tomography of the kidneys and urinary tract without intravenous contrast
A single-center randomized study to evaluate the safety and effectiveness of direct puncture of the caliceal system in mini-percutaneous nephrolithotripsy.~60 patients~Inclusion criteria:~all patients aged 18 to 70 years who are planning mini-PCNL, ready to consent to the study~ASA scale 1-3~Solitary stone up to 2.5 cm~Single access to the caliceal system~Exclusion criteria:~Active infectious process~Coagulopathies~Abnormalities of the urinary system