In this paper, the knot strengths of the seven strands which were made of polyethleneterephthalate(PET), nylon 6, polyvinyl formal fibre, polypropylene and polyethylene with differentspecification used for industrial ...In this paper, the knot strengths of the seven strands which were made of polyethleneterephthalate(PET), nylon 6, polyvinyl formal fibre, polypropylene and polyethylene with differentspecification used for industrial purposes were tested and discussed. The results of experimentshow: the knot strength loss does not only depend on the breaking elongation and the diameter ofsample, but also on the shape of the load-extension curve and twist factor of sample and other fac-tors; the range of the knot strength loss and the breaking energy loss vary in a wide range, in thepresent case. the former is from 2.7% to 58.14% and the latter from 16.36% to 78.76%. Thestrength loss of the polypropylene filament is the least among the samples investigated.展开更多
Background: Forces applied to knots used for interrupted vs. continuous closures are very different. We studied the knot strength and knot security of three knots when simulating a continuous wound closure: the square...Background: Forces applied to knots used for interrupted vs. continuous closures are very different. We studied the knot strength and knot security of three knots when simulating a continuous wound closure: the square, the sliding, and a hybrid constructed using a surgeon’s square knot followed by a sliding knot. Mate-rials and Methods: Knot holding capacity (KHC) of single-strand 1-0 polypropylene was determined by slow distraction on a horizontal testing sled of the strand that would be used to complete a continuous (“running”) closure following placement of an anchoring knot with six throws. Distraction continued until failure of the knot defined as breakage or slippage of the knot. Results: The mean and standard deviation of KHC meas-ured in pounds was determined (n = 30 for each knot): standard square 8.94 +/– 1.04;sliding 10.72 +/– 1.35;and hybrid 10.95 +/– 1.10. For each knot the relative knot security [(KHC of the knot/Tensile strength of untied strand) x 100] was calculated: standard square 69.5%;sliding 83.4%;hybrid 85.2%. Significant dif-ferences (p < 0.0001) in KHC exist between square and sliding knots (favoring sliding knots) and between square and hybrid knots (favoring hybrid knots). Hybrid and sliding knots were not statistically different. Conclusion: Sliding knots and hybrid knots are superior to square knots as anchoring knots for single-strand continuous wound closure.展开更多
文摘In this paper, the knot strengths of the seven strands which were made of polyethleneterephthalate(PET), nylon 6, polyvinyl formal fibre, polypropylene and polyethylene with differentspecification used for industrial purposes were tested and discussed. The results of experimentshow: the knot strength loss does not only depend on the breaking elongation and the diameter ofsample, but also on the shape of the load-extension curve and twist factor of sample and other fac-tors; the range of the knot strength loss and the breaking energy loss vary in a wide range, in thepresent case. the former is from 2.7% to 58.14% and the latter from 16.36% to 78.76%. Thestrength loss of the polypropylene filament is the least among the samples investigated.
文摘Background: Forces applied to knots used for interrupted vs. continuous closures are very different. We studied the knot strength and knot security of three knots when simulating a continuous wound closure: the square, the sliding, and a hybrid constructed using a surgeon’s square knot followed by a sliding knot. Mate-rials and Methods: Knot holding capacity (KHC) of single-strand 1-0 polypropylene was determined by slow distraction on a horizontal testing sled of the strand that would be used to complete a continuous (“running”) closure following placement of an anchoring knot with six throws. Distraction continued until failure of the knot defined as breakage or slippage of the knot. Results: The mean and standard deviation of KHC meas-ured in pounds was determined (n = 30 for each knot): standard square 8.94 +/– 1.04;sliding 10.72 +/– 1.35;and hybrid 10.95 +/– 1.10. For each knot the relative knot security [(KHC of the knot/Tensile strength of untied strand) x 100] was calculated: standard square 69.5%;sliding 83.4%;hybrid 85.2%. Significant dif-ferences (p < 0.0001) in KHC exist between square and sliding knots (favoring sliding knots) and between square and hybrid knots (favoring hybrid knots). Hybrid and sliding knots were not statistically different. Conclusion: Sliding knots and hybrid knots are superior to square knots as anchoring knots for single-strand continuous wound closure.
