STUDI VARIASI JENIS MATERIAL TALI PADA MODIFIKASI ALAT PENGUKURAN TORSI POMPA SENTRIFUGAL

The focus of this research is to analyze variations in the type of rope material and size as a link for measuring the force on a centrifugal pump, namely to find out the type of material and the size of the rope that is suitable to minimize the loss of force contained in the wire. To find out the type of calculation and comparison of the values for various types of material. From the tensile test that has been done, the highest UTS (Ultimate Tensille Stress) value was obtained in a polypropylene monofilament rope specimen with a stress value of 602.17 kgf with 382.14% elongation. The highest stress calculation value data was obtained by the Polypropylene monofilament rope specimen with a value of 738,85 at elongation to 360%. The highest modulus of elasticity obtained by Nylon rope was 4,564 . This shows that the modulus of elasticity is inversely proportional to the stress value, which was the stress value of nylon straps that was the highest compared to other specimens but had the highest elastic modulus value among other specimens.

ON INVESTIGATION OF TENSILE STRENGTH OF COMMERCIAL SYNTHETIC NON-ABSORBABLE SUTURE MADE FROM OF BLUE POLYPROPYLENE MONOFILAMENT

Objective: The purpose of this research is to investigate the tensile strength of commercial synthetic non-absorbable suture made from blue polypropylene monofilament that commonly used in surgery.Methods: The commercial synthetic non-absorbable made from blue polypropylene monofilament was prepared for this purpose. The ASTM C1557-03 was used as a standard the method for analysis. For accuracy of the measurement, the diameter of the sutures was measured using optical microscope. The tensile strength, strain at failure, and modulus elasticity of the sutures were measured following instruction from the standard test method. The graph strain versus stress was provided.Results: Results show that that the average tensile strength of five valid tested samples is about 875.812 MPa. The average strain is found about 0.282. The average of modulus of elasticity is 4026.069 MPa.Conclusion: It is concluded that the sutures of commercial synthetic non-absorbable suture made from blue polypropylene monofilament having linier elastic as well as plastic properties. The average tensile strength of five valid tested samples is about 875.812 MPa. The average strain at failure is found about 0.282. The average of modulus of elasticity is 4026.069 MPa.

Comparative Study for Application of Polypropylene Monofilament Light Mesh, Polypropylene Monofilament Heavy Mesh and Self Gripping Polypropylene Mesh in Patients with Inguinal Hernia Surgically Treated with Lichtenstein Technique

Background / Objective. In our clinical study we have compared the results of intraoperative and postoperative period in patients with inguinal hernia treated operatively with Lichtenstein technique, where one of three different polypropylene meshes has been applied: polypropylene monofilament light mesh, polypropylene monofilament heavy mesh and self gripping polypropylene mesh. Follow up period have been one year. Methods. This study represents randomized, retrospective-prospective, comparative clinical study where 243 patients have been divided into three groups depends of prosthetic mesh that was applied with Lichtenstein technique. We have evaluated the connection between types of used mesh with some of followed parameters: postoperative pain intensity, postoperative patient mobilization, postoperative surgical site occurrences, duration of hospitalization, chronic pain, filling of foreign body in inguinal area and development of recurrences. Results. Patients with applied self gripping polypropylene mesh have significantly lowest pain, lowest hospital stay and lowest duration of surgical procedure than other two groups of patients. In term of chronic pain, only statistically significance we confirmed between the groups of heavy monofilament mesh and self griping polypropylene mesh, where higher number of patients from group with monofilament polypropylene light mesh reported chronic pain. In our study we confirmed that working status and patient age have significant influence on the intensity of postoperative pain in all three patients group. There is no statistical correlation between type of the mesh and surgical site occurrence rate. Conclusion. Patients with applied self gripping polypropylene mesh have significantly lowest pain, lowest hospital stay, lowest duration of surgical procedure and less number of patients experienced feeling of “foreign body” in their groin than other two groups of patients.

Success of Custommade Transobturator Slings Prepared From Conventional Polypropylene Mesh in the Treatment of Stress Urinary Incontinence in Women

Objective: To observe the outcome of the transobturator tape, using custommade slings prepared from conventional polypropylene mesh in women in management of SUI. Materials and Methods: This prospective observational study was carried out from June 2010 to April 2015 among 35 patients who underwent the TOT procedure using handmade (polypropylene monofilament) slings; and complete at least the 12 month follow up period. Medical history, demographic characteristics, body mass indexes (BMI), menopausal status of patients, operation time, cost of sling, success of operation and complications were recorded. Before the operation, all patients were confirmed SUI through physical examination, urinalysis, urodynamic studies and ultrasonography. Placement of the sling to the midurethra was done in manner as described by Delorme. All the data were analyzed. Results: There were 35 patients with mean age 51.23 ± 5.63years, BMI 26.14 ± 3.70 kg/m². Twenty of the patients post were menopausal. The cost of the sling was 1200 BDT (15 USD). The success rate of TOT 12 months after surgery and at the last follow up was 91.5% and 88.6% respectively. Postoperative obstruction was noted in 2 patients, vaginal extrusion occurred in one case, de novo urgency and urinary tract infection (UTI) occurred in 2 patients. All of them were managed successfully with conservative treatments. There was no other early or late postoperative complication. There was significant improvement of the QoL and statistically no significant decrease in the Q max during the follow up period. Conclusion: Custommade mesh is a reasonable option in TOT surgery with good efficacy and cost effectiveness and complication like vaginal extrusion is also minimum. Bangladesh Journal of Urology, Vol. 18, No. 2, July 2015 p.49-55

Morphological indicators of subcutaneous implantation of monofilament mesh

Hernias are a significant, non-infectious animal condition. In productive animals, failure to provide surgical treatment leads to premature rejection and potential loss of their productive longevity. In small pets, this becomes a social problem for pet owners related to the keeping and death of affected animals. The aim of this study was to study the histological parameters of tissues during implantation of monofilament mesh in cattle for periods up to four months. The study was conducted on eight bulls of the Black Motley breed, divided into two groups of four animals. In the first group, four bulls received a subcutaneous implant of hernioplasty mesh made of polypropylene monofilament (Herniamesh S.R.I. Via CiRie 22 / A, San Maruro Torinese, Torino, Italy) in the area of the lateral soft abdominal wall on the right and left sides. In the second group, four bulls received implants in the middle third of the neck to the right and left sides. Thus, the subject of research was 16 wounds with implanted mesh. A sterile piece monofilament mesh, 1x2 cm in size and folded in half along the longitudinal side, was inserted vertically into the formed hypodermic pocket on the right side of the wound, in which it was possible to freely place the specified mesh. During the course of the study, Polycon No. 4 thread with intermittent knotted seams was used, and three sutures were applied. To ensure fixation of the mesh, it was stitched centrally. The material for histological studies was taken by biopsy at one, two, three and four months after implantation. Tissue was embedded in paraffin blocks, and sections were stained with haematoxylin-eosin and picrofuchsin according to Van Gieson. The results indicated that after subcutaneous implantation of monofilament mesh in the neck and abdominal wall in cattle, wound healing occurs by primary intention. It was revealed that from the beginning of the histological study to one month, the monofilament mesh is first overgrown with loose connective tissue. By the end of the study, after four months, this is sequentially differentiated into dense connective tissue. No significant differences were observed between the abdominal wall and neck area as sites of implantation, and morphological processes in both sites proceeded in the same way. Thus, the conducted studies allow us to conclude that monofilament mesh is a suitable material for closing the hernial ring in cattle, where it is not possible to use their own tissues for these purposes.

Mechanical Properties of Polypropylene Warp-Knitted Hernia Repair Mesh with Different Pull Densities

The medical polypropylene monofilament with a diameter of 0.10 mm was used as the material. Four different pull densities and two different warp run-ins were set up on the electronic traverse high-speed Tricot warp knitting machine, with the gauge of E28. The raw material was used to knit four variations of single bar plain knitted fabrics with 1 in-1 miss setting. Each variation required eight samples. The mechanical properties of the above 32 warp-knitted fabric samples are tested, including their tensile stress (in both vertical and horizontal directions), tearing stress (in both vertical and horizontal directions) and bursting stress. The results obtained shows that the relationship between the vertical, the horizontal stress, and the pull density are not monotonic. The tensile stress in the vertical direction firstly decreases and then increases with an increase of the pull density; however, the tensile stress in the horizontal direction firstly increases and then slightly decreases with an increase of the pull density; again the vertical tensile stress of all fabrics was always higher than the horizontal tensile stress. The bursting stress has a positive linear relation to the pull density. The vertical tearing stresses of four samples were greater than the horizontal tearing stress.

Physico-Mechanical Performance Evaluation of Large Pore Synthetic Meshes with Different Textile Structures for Hernia Repair Applications

This paper studied the relationship between the textile structure of warp knitted hernia repair meshes and their physico-mechanical properties to solve the problem of hernia patch application evaluation and clear the mechanism of hernia patch structure-performance for clinical application. Six different prototypes of large pore meshes were fabricated, including four kinds of meshes with different pore shapes: H (hexagonal), D (diamond), R (round) and P (pentagonal); and two kinds of meshes with inlays: HL (hexagonal with inlays) and DL (diamond with inlays), using the same medical grade polypropylene monofilament. All meshes were designed with the same walewise density and coursewise density. Then the influence of other structural parameters on the physico-mechanical properties of the meshes was analysed. The physico-mechanical properties of these meshes tested meet the requirements of hernia repair, except mesh DL, whose tear resistance strength (12.93 ± 2.44 N in the transverse direction) was not enough. Mesh R and P demonstrated less anisotropy, and they exhibited similar physico-mechanical properties. These four kinds of meshes without inlays demonstrated similar ball burst strength properties, but mesh HL and DL exhibited better ball burst strength than the others. All in all, uniform structures are expected to result in less anisotropy, and meshes with inlays, to some extent, possess higher mechanical properties. And the ratio of open loop number to closed loop number in a repetition of weave of fabric has marked effect on the physico-mechanical properties. Thus we can meet the demands of specific patients and particular repair sites by designing various meshes with appropriate textile structures.