Abstract:
BACKGROUND:Stents are used abundantly to maintain ureteral patency. The majority are plastic tubes that adjust easily to upper urinary-tract motion. Recently, a coiled-wire lumenless stent was introduced (ZebraStent, Neo Medical, Munich, Germany) to facilitate expulsion of stone fragments after lithotripsy. Its metal core is composed of Nitinol, with the soft J ends being of titanium. The thin shape considerably increases the extraluminal space. The ZebraStent stretches the ureter and also provides a surface for the fragments to glide along. In our 18-month experience with the ZebraStent, two of them fractured along the shaft. We sought to learn whether this complication resulted from a defect in stent design or from material fatigue secondary to constant movement. MATERIALS AND METHODS:Our model is powered by an electric motor that produces a constant displacement similar to stent movements in vivo. The whole ZebraStent is embedded in a 37 degrees C waterbath to simulate physiological conditions within the ureter. We used an average displacement of 16 mm. The average frequency of ventilatory-cycle simulation was 20 times that in vivo, allowing us to collect data in a shorter time. RESULTS:All 10 stents broke within the proximal Nitinol shaft at the equivalent of 4 to 6 months (125-179 days). CONCLUSIONS:Our preliminary results show that all stents break after the equivalent of 4 or more months. The fact that this occurs in the homogenous proximal Nitinol shaft rather than at the welding point between the shaft and the titanium curl implies that breakage is secondary to material fatigue and not design error. Extensive testing is under way to confirm material fatigue as the cause of breakage. We hope to determine a safe dwelling time for these stents, which at the moment should not exceed 3 months.
journal_name
J Endouroljournal_title
Journal of endourologyauthors
Bafaloukas N,Birch M,Buchholz Ndoi
10.1089/end.2006.9862subject
Has Abstractpub_date
2008-02-01 00:00:00pages
389-92issue
2eissn
0892-7790issn
1557-900Xjournal_volume
22pub_type
杂志文章abstract:BACKGROUND AND PURPOSE:Whereas ureteroscopic lithotripsy is more efficacious than SWL in treating lower-ureteral stones, the same has not been universally said of its ability to treat proximal ureteral stones. Because failed proximal lithotripsy is often attributable to the complications associated with stone migration...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2004.18.862
更新日期:2004-11-01 00:00:00
abstract:PURPOSE:To assess the feasibility and report early outcomes of robot-assisted anatrophic nephrolithotomy (RAN) as a treatment modality for patients with complex staghorn calculi. PATIENTS AND METHODS:In this single-center prospective study, seven consecutive patients underwent RAN for complex staghorn calculi. After d...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2013.0597
更新日期:2014-03-01 00:00:00
abstract:PURPOSE:The purpose of this study was to assess the extent of the increased intracranial pressure (ICP) resulting from CO2 pneumoperitoneum and steep Trendelenburg positioning using ultrasonographic measurement of optic nerve sheath diameter (ONSD) in patients undergoing robot-assisted laparoscopic radical prostatectom...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2014.0019
更新日期:2014-07-01 00:00:00
abstract:: Objective: To determine if radiologically diagnosed nonalcoholic fatty liver disease (NAFLD) is an independent risk factor for nephrolithiasis using data from National Health and Nutrition Examination Survey III (NHANES III). Patients and Methods: ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2020.0486
更新日期:2020-12-01 00:00:00
abstract:PURPOSE:Laparoscopic surgery for large renal lesion or kidneys with chronic inflammation has proved to be technically challenging. Hand-assisted laparoscopic surgery might be useful in these complex cases, as it provides surgeons the benefits of tactile feedback, digital retraction, and facilitated dissection of the re...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2004.18.770
更新日期:2004-10-01 00:00:00
abstract:BACKGROUND AND PURPOSE:Functional losses near 20% are seen in the operated kidney during partial nephrectomy. Resected healthy margins are small and ischemia time limited in the modern era. We hypothesize that reconstruction following tumor resection is modifiable and a significant cause of renal function injury. MATE...
journal_title:Journal of endourology
pub_type: 杂志文章,评审
doi:10.1089/end.2016.0055
更新日期:2016-05-01 00:00:00
abstract::The identification of calcium-binding proteins in urine and kidney stones has led to a closer look at the role of matrix proteins in urolithiasis. We analyzed five struvite stones for protein content and identified two bands (8 and 14 KDa) that were confirmed by gel electrophoresis and amino acid sequencing to be calg...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.1994.8.95
更新日期:1994-04-01 00:00:00
abstract::Using ureterorenoscopes with unidirectional flow, the urologist faces a conflict between a good view on one hand and high pressure in the ureter and the pelvic collecting system of the kidney on the other hand. The ureterorenoscope designed by Gelet, which has continuous (bidirectional) flow and separate irrigation an...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.1997.11.337
更新日期:1997-10-01 00:00:00
abstract:OBJECTIVE:Accurate tumor staging in renal cancer is critical for prognostic projections, follow-up schedules, clinical trials and potential systemic therapies. We studied patients undergoing laparoscopic radical nephrectomy (LRN) to determine the extent of upstaging on histopathology evaluation and correlated the clini...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2008.0399
更新日期:2008-10-01 00:00:00
abstract:BACKGROUND AND PURPOSE:The management of urolithiasis in patients with a solitary kidney is challenging for endourologists. This study was aimed at evaluating the safety and efficacy of retrograde intrarenal surgery (RIRS) in the treatment of such patients with renal stones. PATIENTS AND METHODS:Between January 2010 a...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2014.0295
更新日期:2014-11-01 00:00:00
abstract::Two women with symptomatic stone-filled caliceal diverticula were treated by a retroperitoneoscopic approach. With a three-port technique, the diverticulum was marsupialized, the calculi removed, the cavity fulgurated, and perirenal fat inserted. The patients had no morbidity and remain stone and symptom free. They re...
journal_title:Journal of endourology
pub_type: 杂志文章,评审
doi:10.1089/end.2004.18.672
更新日期:2004-09-01 00:00:00
abstract:: Purpose: Transparently reported, high-quality randomized controlled trials (RCTs) play a critical role in guiding evidence based clinical practice and informing evidence-based guidelines in patients with nephrolithiasis. Prior studies have found reporting quality to be low...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2019.0649
更新日期:2020-04-01 00:00:00
abstract:: Purpose: To examine gas bubbles generated by two laser lithotripsy devices, a pulsed thulium solid-state laser and a holmium:yttrium-aluminum-garnet (Ho:YAG) device, and their possible effects in lithotripsy. Materials and Methods: ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2020.0526
更新日期:2020-12-22 00:00:00
abstract::We identified 40 patients (25 men and 15 women) who developed calculi composed totally or partially of sulfonamides (acetylsulfamethoxazole, sulfadiazine, and acetylsulfisoxazole) between 1980 and 1987. The incidence of sulfonamide stones is less than 1% of stones. Patient characteristics were determined from question...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.1994.8.401
更新日期:1994-12-01 00:00:00
abstract:BACKGROUND AND PURPOSE:Although the evidence is sparse, most urologists advise the insertion of a safety guide wire (SGW) alongside the ureteroscope whenever performing ureteroscopy (URS). The aim of the study was to compare the results of ureteroscopic treatment for ureteral stones at the Oslo University Hospital (OUH...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2013.0248
更新日期:2013-10-01 00:00:00
abstract:BACKGROUND AND PURPOSE:Patients with spinal neuropathy are at an increased risk for urolithiasis. Data on percutaneous nephrolithotomy (PCNL) in this population are limited. Our objective is to review our experience in managing stones with PCNL in patients with spinal neuropathy. PATIENTS AND METHODS:Twenty-one patien...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2012.0344
更新日期:2012-12-01 00:00:00
abstract:BACKGROUND AND PURPOSE:Conical blunt trocar insertion may eliminate the need for fascial closure (FC) in transperitoneal laparoscopic renal surgery. This concept applies to 12-mm blunt trocar placement through muscular parts of the abdominal wall, relying on muscle splitting and eventual muscle retraction when the troc...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/089277902753483718
更新日期:2002-02-01 00:00:00
abstract::Vesicoureteral reflux (VUR) in the animal model for experimental purposes can be created either by open transvesical or endoscopic techniques. The concept of reflux creation is the same for both techniques: incision of the roof of the intramural portion of the ureter at the 12 o'clock position. The open method has the...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.1998.12.41
更新日期:1998-02-01 00:00:00
abstract:BACKGROUND AND PURPOSE:There have been several reports of rhabdomyolysis occurring after prolonged laparoscopic procedures in the flank position. Accordingly, we evaluated interface pressures between the skin and three commonly used operating room table surfaces. The aim of our study was to determine if pressure change...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2008.0047
更新日期:2008-06-01 00:00:00
abstract:PURPOSE:Partial nephrectomy has been established as a standard of care for T(1a) renal tumors. Laparoscopic partial nephrectomy (LPN) has been described as more difficult to perform than open partial nephrectomy (OPN). We compare our series of LPN and OPN. PATIENTS AND METHODS:From October 2002 to January 2006, 76 LPN...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2007.0300
更新日期:2008-05-01 00:00:00
abstract:BACKGROUND AND PURPOSE:There is no uniform consensus regarding the anatomic factors that influence the clearance rate of caliceal stones after SWL, as different authors have studied various independent factors separately. We correlated both favorable and unfavorable factors into a formula to predict the clearance rate....
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2006.20.248
更新日期:2006-04-01 00:00:00
abstract:BACKGROUND AND PURPOSE:The introduction of radiofrequency ablation (RFA) into other fields of surgery has fueled the interest to study its application in small renal masses (SRM). Some controversies remain, however, regarding its oncologic efficacy. We review technical factors and tissue characteristics that influence ...
journal_title:Journal of endourology
pub_type: 杂志文章,评审
doi:10.1089/end.2009.0677
更新日期:2010-05-01 00:00:00
abstract:: Purpose: To review the literature on optimal methods of drainage for obstructive urolithiasis in adult patients, comparing percutaneous nephrostomy (PCN) with retrograde ureteral catheterization (Double J [JJ]) regarding success of procedure, efficacy, complications, quali...
journal_title:Journal of endourology
pub_type: 杂志文章,评审
doi:10.1089/end.2019.0309
更新日期:2019-10-01 00:00:00
abstract:BACKGROUND AND PURPOSE:As life expectancy continues to increase, we will be faced with the need to counsel older patients on the risks and benefits of undergoing surgery. It is clear that laparoscopic renal surgery has significant benefits over open renal surgery. However, contemporary data on whether these benefits ca...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2007.9885
更新日期:2007-11-01 00:00:00
abstract:PURPOSE:Telemedicine has become a common method for the transmission of images and patient data across long distances. Our goal was to assess the efficiency and accuracy of Photomailer MD software, a store-and-forward telemedicine system, in the urologic setting. METHODS:Photomailer MD software was loaded on two compu...
journal_title:Journal of endourology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1089/end.1999.13.141
更新日期:1999-04-01 00:00:00
abstract:PURPOSE:Pretreating a pig kidney with 500 low-energy shock waves (SWs) before delivering a clinical dose of SWs (2000 SWs, 24 kV, 120 SWs/min) has been shown to significantly reduce the size of the hemorrhagic lesion produced in that treated kidney, compared with a protocol without pretreatment. However, since the time...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2016.0087
更新日期:2016-09-01 00:00:00
abstract:BACKGROUND AND PURPOSE:The role of volumetric estimation is becoming increasingly important in the staging, management, and prognostication of benign and cancerous conditions of the kidney. We evaluated the use of three-dimensional reconstruction volume (3DV) in determining renal parenchymal volumes (RPV) and renal tum...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2013.0796
更新日期:2014-06-01 00:00:00
abstract:: Introduction: Miniaturization of percutaneous nephrolithotomy (mPCNL) was proposed to decrease postoperative bleeding, as there is decreased parenchymal injury compared with standard percutaneous nephrolithotomy (SPCNL). Published randomized controlled trials (RCTs) evalua...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2020.0533
更新日期:2020-10-12 00:00:00
abstract:PURPOSE:This report describes a new animal model for research on the parameters of shockwave delivery and the mechanisms of shockwave action in SWL. MATERIALS AND METHODS:Female pigs (approximately 45 kg) were anesthetized for creation of an upper pole peripheral caliceal access. The tract was dilated with a 30F Nephr...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/089277902320913215
更新日期:2002-10-01 00:00:00
abstract:BACKGROUND AND PURPOSE:We have previously shown that men tolerate office flexible cystoscopy better when they simultaneously view the monitor during their procedure. We sought to demonstrate similar effects of distraction on women undergoing rigid office cystoscopy. PATIENTS AND METHODS:100 consecutive women underwent...
journal_title:Journal of endourology
pub_type: 杂志文章,随机对照试验
doi:10.1089/end.2008.0076
更新日期:2008-12-01 00:00:00