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Ma Z, Gao M, Na D, Li Y, Tan L, Yang K. Study on a biodegradable antibacterial Fe-Mn-C-Cu alloy as urinary implant material. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 103:109718. [PMID: 31349483 DOI: 10.1016/j.msec.2019.05.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 04/13/2019] [Accepted: 05/02/2019] [Indexed: 11/30/2022]
Abstract
Biodegradable Fe based alloys have been investigated for fracture fixation and cardiovascular support to overcome complications of permanent implants. This study was focused on the development of a new Fe-Mn-C-Cu alloy with antibacterial and anti-encrustation properties as a urinary implant material. The microstructure and mechanical properties of the alloy were studied. The degradation behavior, antibacterial and anti-encrustation properties were evaluated by immersion test, antibacterial test and encrustation test, respectively. The results showed that Fe-Mn-C-Cu alloy was a non-magnetic, biodegradable, anti-bacterial and anti-encrustation alloy that could inhibit the biofilm and stone formations on its surface through the dual effects of degradation and Cu ions release. The study revealed the preliminary mechanisms of anti-infection and anti-encrustation for Fe-Mn-C-Cu alloy due to the continuous release of Cu2+ ions, which provides a new idea for application of biodegradable Fe-based material and the treatment of urinary tract infections and stones in the urinary system.
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Affiliation(s)
- Zheng Ma
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
| | - Ming Gao
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China; School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, China
| | - Di Na
- First Affiliated Hospital of China Medical University, Department of Surgical Oncology, China
| | - Yangde Li
- Dongguan Eontech Co., Ltd, Dongguan 523662, China
| | - Lili Tan
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China.
| | - Ke Yang
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China.
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Abstract
PURPOSE OF REVIEW There has been a rapid and widespread adoption of the robotic surgical system with a lag in the development of a comprehensive training and credentialing framework. A literature search on robotic surgical training techniques and benchmarks was conducted to provide an evidence-based road map for the development of a robotic surgical skills for the novice robotic surgeon. RECENT FINDINGS A structured training curriculum is suggested incorporating evidence-based training techniques and benchmarks for progress. This usually involves sequential progression from observation, case assisting, acquisition of basic robotic skills in the dry and wet lab setting along with achievement of individual and team-based non-technical skills, modular console training under supervision, and finally independent practice. Robotic surgical training must be based on demonstration of proficiency and safety in executing basic robotic skills and procedural tasks prior to independent practice.
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Affiliation(s)
- Ashwin N. Sridhar
- Department of Urology, University College London Hospital NHS Trust, London, UK
- Division of Surgery and Cancer, University College London, London, UK
| | - Tim P. Briggs
- Department of Urology, University College London Hospital NHS Trust, London, UK
| | - John D. Kelly
- Department of Urology, University College London Hospital NHS Trust, London, UK
- Division of Surgery and Cancer, University College London, London, UK
| | - Senthil Nathan
- Department of Urology, University College London Hospital NHS Trust, London, UK
- Division of Surgery and Cancer, University College London, London, UK
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Abstract
In the past 10 years, laparoscopy has been challenged by robotic surgery; nevertheless, laparoscopic techniques are subject to continuous change. Ultrahigh definition is the next development in video technology, it delivers fourfold more detail than full high definition resulting in improved fine detail, increased texture, and an almost photographic emulsion of smoothness of the image. New 4K ultrahigh-definition technology might remove the current need for the use of polarized glasses. New devices for laparoscopy include advanced sealing devices, instruments with six degrees of freedom, ergonomic platforms with armrests and a chest support, and camera holders. A manually manipulated robot-like device is still at the experimental stage. Robot-assisted surgery has substantially revolutionized laparoscopy, increasing its distribution; however, robot-assisted surgery is associated with considerable costs. All technical improvements of laparoscopic surgery are extremely valuable to further simplify the use of classical laparoscopy.
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Roth B, Birkhäuser FD, Thalmann GN, Zehnder P. Novel prototype sewing device, EndoSew®, for minimally invasive surgery: an extracorporeal ileal conduit construction pilot study in 10 patients. BJU Int 2013; 112:959-64. [PMID: 23496430 DOI: 10.1111/j.1464-410x.2012.11599.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
UNLABELLED WHAT'S KNOWN ON THE SUBJECT? AND WHAT DOES THE STUDY ADD?: The EndoSew(®) prototype was first tested in a porcine model several years ago. The investigators found it both simple to master and reliable, its greatest advantage being a 2.4-fold time saving compared with straight laparoscopic suturing. In addition to that publication, there is a single case report describing the performance of an open EndoSew(®) suture to close parts (16 cm) of an ileal neobladder. The time for suturing the 16 cm ileum was 25 min, which is in line with our experience. The knowledge on this subject is limited to these two publications. We report on the first consecutive series of ileal conduits performed in humans using the novel prototype sewing device EndoSew(®). The study shows that the beginning and the end of the suture process represent the critical procedural steps. It also shows that, overall, the prototype sewing machine has the potential to facilitate the intracorporeal suturing required in reconstructive urology for construction of urinary diversions. OBJECTIVE To evaluate the feasibility and safety of the novel prototype sewing device EndoSew(®) in placing an extracorporeal resorbable running suture for ileal conduits. PATIENTS AND METHODS We conducted a prospective single-centre pilot study of 10 consecutive patients undergoing ileal conduit, in whom the proximal end of the ileal conduit was closed extracorporeally using an EndoSew(®) running suture. The primary endpoint was the safety of the device and the feasibility of the sewing procedure which was defined as a complete watertight running suture line accomplished by EndoSew(®) only. Watertightness was assessed using methylene blue intraoperatively and by loopography on postoperative days 7 and 14. Secondary endpoints were the time requirements and complications ≤30 days after surgery. RESULTS A complete EndoSew(®) running suture was feasible in nine patients; the suture had to be abandoned in one patient because of mechanical failure. In three patients, two additional single freehand stitches were needed to anchor the thread and to seal tiny leaks. Consequently, all suture lines in 6/10 patients were watertight with EndoSew(®) suturing alone and in 10/10 patients after additional freehand stitches. The median (range) sewing time was 5.5 (3-10) min and the median (range) suture length was 4.5 (2-5.5) cm. There were no suture-related complications. CONCLUSIONS The EndoSew(®) procedure is both feasible and safe. After additional freehand stitches in four patients all sutures were watertight. With further technical refinements, EndoSew(®) has the potential to facilitate the intracorporeal construction of urinary diversions.
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Affiliation(s)
- Beat Roth
- Department of Urology, University of Bern, Bern, Switzerland
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Blute Jr ML, George A, Herati A, Srinivasian A, Vira MA, Kavoussi LR, Richstone L. Intracorporeal neobladder reconstruction: pressure-flow urodyamic studies in cadaveric orthotopic neobladders. BJU Int 2011; 109:434-6. [DOI: 10.1111/j.1464-410x.2011.10403.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Roosen A, Woodhouse CRJ, Wood DN, Stief CG, McDougal WS, Gerharz EW. Animal models in urinary diversion. BJU Int 2011; 109:6-23. [PMID: 21917109 DOI: 10.1111/j.1464-410x.2011.10494.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We set out to critically assess the value of animal experimentation in urinary diversion through intestinal segments, as some authors question the effectiveness of animal research, criticising the methodological quality, lack of standardization, inadequate reporting and the few systematic reviews in this field. Based on a comprehensive MEDLINE literature search (MeSH database; search terms: urinary diversion, urinary reservoirs, continent, rat, dog, animal models) we retrieved and evaluated all full-length papers published in English, German, French, and Spanish languages from 1966 to 2011 reporting the use of animal models in the setting of urinary diversion. Studies were stratified according to the addressed research question. Within each category species, gender, number of animals, age at procedure, type of diversion, mortality, length of follow-up, experimental procedure and outcome were recorded and tabulated. In all, 159 articles were judged to be relevant and while there are numerous animal models only a few have been used in more than one study. Animals were used for the systematic study of new surgical techniques (93 articles) or metabolic and functional consequences of urinary reconstruction (66 articles). For the latter purpose, the most often used animal is the rat, whereas the dog model is preferred for technical experimentation. In many studies, the validity of the model is at least questionable. Animal experiments have repeatedly been conducted addressing the same question, often with striking discrepancies in outcome. Animal studies were even performed after a surgical technique had been pioneered in humans. The use of animal models in urinary diversion is far from standardized rendering the results less than ideal for comparison across studies. Due to differences in anatomy and physiology, the applicability of findings in animal experiments to clinical urology is limited. Continued effort is needed to optimise the use of animal models in experimental urology.
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Affiliation(s)
- Alexander Roosen
- Department of Urology, Ludwig-Maximilians University Medical School, Munich, Germany.
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Schuster TK, Jacobs BL, Gayed BA, Averch TD. Preliminary Experience with Laparoscopic Ureteropelvic Junction Release in the Treatment of Ureteropelvic Junction Obstruction. J Endourol 2010; 24:393-6. [DOI: 10.1089/end.2009.0194] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Tina K. Schuster
- Department of Urology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Bruce L. Jacobs
- Department of Urology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Bishoy A. Gayed
- Department of Urology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Timothy D. Averch
- Department of Urology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
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Durak E, Hruby GW, Okhunov Z, Sprenkle P, Mirabile G, Marruffo F, Landman J. Complete ileal neobladder intracorporeal construction with standard sutured technique and novel technology. J Urol 2010; 183:1227-31. [PMID: 20096862 DOI: 10.1016/j.juro.2009.11.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2009] [Indexed: 11/25/2022]
Abstract
PURPOSE We compared the surgical efficacy and efficiency of a completely suture based procedure with a novel entero-urethral anastomosis device and an EndoGIA stapler to create an ileal neobladder. MATERIALS AND METHODS Two groups of 7 pigs each were survived for 8 weeks. In group 1 the neobladder was constructed using a U-shaped segment of ileum sealed with the stapler. The entero-urethral anastomosis was created with a novel sutureless anastomosis device. All other procedures were completed with standard intracorporeal suturing techniques. In group 2 animals completely intracorporeal sutured technique was used. Total procedure, and enteroenteric, ileal neobladder, uretero-enteric and entero-urethral anastomosis times were recorded. Cystograms done immediately postoperatively, at 2 weeks and at sacrifice to evaluate the newly constructed system were rated from 0-no leakage to 3-severe leakage. RESULTS In group 1 vs 2 the overall procedure, and enteroenteric, ileal neobladder, uretero-enteric and entero-urethral anastomoses were completed in 285.3, 32.3, 58.8, 54.2 and 5.5 vs 350.1, 29.9, 139.1, 58.0 and 46.3 minutes, respectively. In groups 1 and 2 the average postoperative cystogram rating was 0.83 and 1.6, respectively (p = 0.63). At 2 weeks and at sacrifice cystograms showed no extravasation in either group. The overall surgical procedure, pouch creation and entero-urethral anastomosis were statistically briefer in group 1 (p = 0.036, 0.01 and 0.039, respectively). Average survival in groups 1 and 2 was 30 (range 4 to 56) and 41 days (range 1 to 56), respectively (p = 0.36). All animals had voiding complications within 1 week after ureteral and urethral catheters were removed. One neobladder ruptured in group 1. CONCLUSIONS Combining stapled ileal neobladder construction and the entero-urethral anastomosis device significantly decreases operative time, pouch creation and urethral anastomoses.
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Affiliation(s)
- Evren Durak
- Department of Urology, Columbia University Medical Center, New York, New York, USA
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Abstract
PURPOSE OF REVIEW The present review aims to update new techniques of pelvic exenteration including minimal invasive surgery, and discuss other aspects of this radical surgery, including worldwide differences. RECENT FINDINGS Major advances are made since the first description of pelvic exenteration and the operation is still under evolution. Explorative laparoscopy prior to exenteration is a valuable alternative to laparotomy to elect candidates for pelvic exenteration. There are considerable differences with respect to indications, contraindications, preoperative staging and adjuvant therapy after exenteration in different countries. Advances in laparoscopic instruments also led to the laparoscopic exenteration. The main limiting step of the operation is urinary diversion. New techniques of laparoscopic-assisted and robotic-assisted techniques of urinary diversion have been reported that decrease the operation time. Vascularized muscle flaps are preferred by many surgeons to fill the empty pelvis and provide an acceptable vaginal reconstruction. J-pouch seems to be a safer technique than end-to-end coloanal anastomosis for bowel reconstruction. Developments in the bioengineering tissue for pelvic reconstruction are required. SUMMARY Laparoscopy has the advantages of decreased blood loss, improved convalescence, lower incidence of wound infection and incisional hernia, short recovery periods, rapid return of bowel function, better pain control and improved cosmetics compared with laparotomy for pelvic exenteration. Magnification and improved visualization permits en-bloc dissection of tumor and good anastomosis technique. New techniques of urinary diversion, orthotopic neobladder and coloanal are promising.
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Ramirez-Backhaus M, Hellawell G, Melo M, Covita A, Stolzenburg JU. Teaching laparoscopy to residents: How can we select good candidates? Curr Urol Rep 2009; 10:106-11. [DOI: 10.1007/s11934-009-0020-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Current World Literature. Curr Opin Obstet Gynecol 2009; 21:101-9. [DOI: 10.1097/gco.0b013e3283240745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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