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Bijan Najafi - One of the best experts on this subject based on the ideXlab platform.
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accuracy and durability of semmes weinstein Monofilaments what is the useful service life
Diabetes Research and Clinical Practice, 2012Co-Authors: Lawrence A Lavery, David E Lavery, Javier Lafontaine, Manish Bharara, Bijan NajafiAbstract:OBJECTIVE: To evaluate the accuracy and effective service life of commercially available Semmes-Weinstein Monofilaments with repetitive loading. METHODS: We obtained 6 brands of Semmes-Weinstein Monofilaments (SWM) from commercial vendors identified from the Internet and the federal registry. Five Monofilaments of each brand were subjected to repeat loading cycles, allowed to rest over night and loaded again the next day. First, sets of five Monofilaments were loaded 25 times for each of five days. Then sets of five Monofilaments were subjected to 200 loading cycles a day for 15 days. A testing jig ensured each SWM was loaded perpendicular to a digital pressure plate. The buckling force was measured via the pressure plate to determine failure loads. Several statistical techniques were used to examine the behavior of the Monofilaments over repeated loadings: time series analysis, ANOVA and nonparametric comparisons of load distributions. RESULTS: The Monofilaments tested were neither precise nor accurate. The plasticity of filaments increased with repeated loadings resulting in lower bending forces. Individual and average bending forces varied widely both within and between Monofilament brands. All Monofilaments showed a typical material failure pattern. Initially the bending force was high but rapidly decreased and then leveled out at levels 1-2g lower than the starting values. After resting over night, the initial bending force was again high but usually not as high as the previous day and bending forces decreased and then leveled out. Most Monofilaments did not start at the accepted 10-g buckling force but varied by up to 30% (p<0.01). At best, Monofilaments starting at the accepted 10±1g buckling force would remain within a usable range (9-11g) for 7-9 days or to evaluate 70-90 patients. CONCLUSION: Commercially available SWM have significant variability within and between devices from different manufacturers. Their actual bending force varies widely from their designated 10g value. When used they have a short service life where the instrument is within 10% of their initial bending force which is not usually the stated 10g of force.
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Accuracy and durability of Semmes-Weinstein Monofilaments: what is the useful service life?
Diabetes Research and Clinical Practice, 2012Co-Authors: Lawrence A Lavery, David E Lavery, Javier Lafontaine, Manish Bharara, David C. Lavery, Bijan NajafiAbstract:OBJECTIVE: To evaluate the accuracy and effective service life of commercially available Semmes-Weinstein Monofilaments with repetitive loading. METHODS: We obtained 6 brands of Semmes-Weinstein Monofilaments (SWM) from commercial vendors identified from the Internet and the federal registry. Five Monofilaments of each brand were subjected to repeat loading cycles, allowed to rest over night and loaded again the next day. First, sets of five Monofilaments were loaded 25 times for each of five days. Then sets of five Monofilaments were subjected to 200 loading cycles a day for 15 days. A testing jig ensured each SWM was loaded perpendicular to a digital pressure plate. The buckling force was measured via the pressure plate to determine failure loads. Several statistical techniques were used to examine the behavior of the Monofilaments over repeated loadings: time series analysis, ANOVA and nonparametric comparisons of load distributions. RESULTS: The Monofilaments tested were neither precise nor accurate. The plasticity of filaments increased with repeated loadings resulting in lower bending forces. Individual and average bending forces varied widely both within and between Monofilament brands. All Monofilaments showed a typical material failure pattern. Initially the bending force was high but rapidly decreased and then leveled out at levels 1-2g lower than the starting values. After resting over night, the initial bending force was again high but usually not as high as the previous day and bending forces decreased and then leveled out. Most Monofilaments did not start at the accepted 10-g buckling force but varied by up to 30% (p
David E Lavery - One of the best experts on this subject based on the ideXlab platform.
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accuracy and durability of semmes weinstein Monofilaments what is the useful service life
Diabetes Research and Clinical Practice, 2012Co-Authors: Lawrence A Lavery, David E Lavery, Javier Lafontaine, Manish Bharara, Bijan NajafiAbstract:OBJECTIVE: To evaluate the accuracy and effective service life of commercially available Semmes-Weinstein Monofilaments with repetitive loading. METHODS: We obtained 6 brands of Semmes-Weinstein Monofilaments (SWM) from commercial vendors identified from the Internet and the federal registry. Five Monofilaments of each brand were subjected to repeat loading cycles, allowed to rest over night and loaded again the next day. First, sets of five Monofilaments were loaded 25 times for each of five days. Then sets of five Monofilaments were subjected to 200 loading cycles a day for 15 days. A testing jig ensured each SWM was loaded perpendicular to a digital pressure plate. The buckling force was measured via the pressure plate to determine failure loads. Several statistical techniques were used to examine the behavior of the Monofilaments over repeated loadings: time series analysis, ANOVA and nonparametric comparisons of load distributions. RESULTS: The Monofilaments tested were neither precise nor accurate. The plasticity of filaments increased with repeated loadings resulting in lower bending forces. Individual and average bending forces varied widely both within and between Monofilament brands. All Monofilaments showed a typical material failure pattern. Initially the bending force was high but rapidly decreased and then leveled out at levels 1-2g lower than the starting values. After resting over night, the initial bending force was again high but usually not as high as the previous day and bending forces decreased and then leveled out. Most Monofilaments did not start at the accepted 10-g buckling force but varied by up to 30% (p<0.01). At best, Monofilaments starting at the accepted 10±1g buckling force would remain within a usable range (9-11g) for 7-9 days or to evaluate 70-90 patients. CONCLUSION: Commercially available SWM have significant variability within and between devices from different manufacturers. Their actual bending force varies widely from their designated 10g value. When used they have a short service life where the instrument is within 10% of their initial bending force which is not usually the stated 10g of force.
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Accuracy and durability of Semmes-Weinstein Monofilaments: what is the useful service life?
Diabetes Research and Clinical Practice, 2012Co-Authors: Lawrence A Lavery, David E Lavery, Javier Lafontaine, Manish Bharara, David C. Lavery, Bijan NajafiAbstract:OBJECTIVE: To evaluate the accuracy and effective service life of commercially available Semmes-Weinstein Monofilaments with repetitive loading. METHODS: We obtained 6 brands of Semmes-Weinstein Monofilaments (SWM) from commercial vendors identified from the Internet and the federal registry. Five Monofilaments of each brand were subjected to repeat loading cycles, allowed to rest over night and loaded again the next day. First, sets of five Monofilaments were loaded 25 times for each of five days. Then sets of five Monofilaments were subjected to 200 loading cycles a day for 15 days. A testing jig ensured each SWM was loaded perpendicular to a digital pressure plate. The buckling force was measured via the pressure plate to determine failure loads. Several statistical techniques were used to examine the behavior of the Monofilaments over repeated loadings: time series analysis, ANOVA and nonparametric comparisons of load distributions. RESULTS: The Monofilaments tested were neither precise nor accurate. The plasticity of filaments increased with repeated loadings resulting in lower bending forces. Individual and average bending forces varied widely both within and between Monofilament brands. All Monofilaments showed a typical material failure pattern. Initially the bending force was high but rapidly decreased and then leveled out at levels 1-2g lower than the starting values. After resting over night, the initial bending force was again high but usually not as high as the previous day and bending forces decreased and then leveled out. Most Monofilaments did not start at the accepted 10-g buckling force but varied by up to 30% (p
Robert Vetrecin - One of the best experts on this subject based on the ideXlab platform.
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a study on in vitro degradation behavior of a poly glycolide co l lactide Monofilament
Acta Biomaterialia, 2008Co-Authors: Meng Deng, Dennis D. Jamiolkowski, Gavin Chen, Daniel Burkley, Jack Zhou, Yunmei Xu, Robert VetrecinAbstract:Abstract The in vitro degradation behaviors of a poly(glycolide- co - l -lactide) 90/10 Monofilament were investigated in phosphate buffer solution at pH 7.4 over a temperature range of 27.5–47.5 °C. The property changes of the Monofilament with time at different temperatures were evaluated by tensile mechanical test, gel permeation chromatography analysis, and image techniques (optical microscopy, scanning electron microscopy and atomic force microscopy). The interrelationships among material properties, in vitro time and experimental conditions were explored. The results showed that the polymer Monofilament gradually lost its tensile strength and molecular weight with increasing in vitro time. The hydrolytic degradation of the Monofilaments followed a first order behavior. Higher temperatures accelerated the degradation process significantly. It was found that for a given tensile breaking strength retention (BSR), the dependence of degradation time on temperature could be illustrated by an Arrhenius-type equation, from which the activation energy was derived. Further analysis indicated that there are well-defined relationships between molecular weight and tensile strength, which could be illustrated mathematically. Finally, the microscopic evaluation of the Monofilament samples revealed visible changes in morphology on the surface and cross-section area during degradation process. The results from atomic force microscopy showed that the surface roughness of the Monofilament tended to increase with the in vitro time.
Lawrence A Lavery - One of the best experts on this subject based on the ideXlab platform.
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accuracy and durability of semmes weinstein Monofilaments what is the useful service life
Diabetes Research and Clinical Practice, 2012Co-Authors: Lawrence A Lavery, David E Lavery, Javier Lafontaine, Manish Bharara, Bijan NajafiAbstract:OBJECTIVE: To evaluate the accuracy and effective service life of commercially available Semmes-Weinstein Monofilaments with repetitive loading. METHODS: We obtained 6 brands of Semmes-Weinstein Monofilaments (SWM) from commercial vendors identified from the Internet and the federal registry. Five Monofilaments of each brand were subjected to repeat loading cycles, allowed to rest over night and loaded again the next day. First, sets of five Monofilaments were loaded 25 times for each of five days. Then sets of five Monofilaments were subjected to 200 loading cycles a day for 15 days. A testing jig ensured each SWM was loaded perpendicular to a digital pressure plate. The buckling force was measured via the pressure plate to determine failure loads. Several statistical techniques were used to examine the behavior of the Monofilaments over repeated loadings: time series analysis, ANOVA and nonparametric comparisons of load distributions. RESULTS: The Monofilaments tested were neither precise nor accurate. The plasticity of filaments increased with repeated loadings resulting in lower bending forces. Individual and average bending forces varied widely both within and between Monofilament brands. All Monofilaments showed a typical material failure pattern. Initially the bending force was high but rapidly decreased and then leveled out at levels 1-2g lower than the starting values. After resting over night, the initial bending force was again high but usually not as high as the previous day and bending forces decreased and then leveled out. Most Monofilaments did not start at the accepted 10-g buckling force but varied by up to 30% (p<0.01). At best, Monofilaments starting at the accepted 10±1g buckling force would remain within a usable range (9-11g) for 7-9 days or to evaluate 70-90 patients. CONCLUSION: Commercially available SWM have significant variability within and between devices from different manufacturers. Their actual bending force varies widely from their designated 10g value. When used they have a short service life where the instrument is within 10% of their initial bending force which is not usually the stated 10g of force.
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Accuracy and durability of Semmes-Weinstein Monofilaments: what is the useful service life?
Diabetes Research and Clinical Practice, 2012Co-Authors: Lawrence A Lavery, David E Lavery, Javier Lafontaine, Manish Bharara, David C. Lavery, Bijan NajafiAbstract:OBJECTIVE: To evaluate the accuracy and effective service life of commercially available Semmes-Weinstein Monofilaments with repetitive loading. METHODS: We obtained 6 brands of Semmes-Weinstein Monofilaments (SWM) from commercial vendors identified from the Internet and the federal registry. Five Monofilaments of each brand were subjected to repeat loading cycles, allowed to rest over night and loaded again the next day. First, sets of five Monofilaments were loaded 25 times for each of five days. Then sets of five Monofilaments were subjected to 200 loading cycles a day for 15 days. A testing jig ensured each SWM was loaded perpendicular to a digital pressure plate. The buckling force was measured via the pressure plate to determine failure loads. Several statistical techniques were used to examine the behavior of the Monofilaments over repeated loadings: time series analysis, ANOVA and nonparametric comparisons of load distributions. RESULTS: The Monofilaments tested were neither precise nor accurate. The plasticity of filaments increased with repeated loadings resulting in lower bending forces. Individual and average bending forces varied widely both within and between Monofilament brands. All Monofilaments showed a typical material failure pattern. Initially the bending force was high but rapidly decreased and then leveled out at levels 1-2g lower than the starting values. After resting over night, the initial bending force was again high but usually not as high as the previous day and bending forces decreased and then leveled out. Most Monofilaments did not start at the accepted 10-g buckling force but varied by up to 30% (p
Sidney Weinstein - One of the best experts on this subject based on the ideXlab platform.
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fifty years of somatosensory research from the semmes weinstein Monofilaments to the weinstein enhanced sensory test
Journal of Hand Therapy, 1993Co-Authors: Sidney WeinsteinAbstract:Abstract In this paper, the author's long history with somatosensation is overviewed with special emphasis on the creation of objective tests of sensibility. Objective testing is discussed using numerous examples from the author's experiences. The creation of the Semmes-Weinstein Monofilaments is discussed. Tests employing the Semmes-Weinstein Monofilaments, two-point discrimination, and point localization are discussed with reference to the fact that these tests reflect specific differences between the central and peripheral nervous systems. Towards that end, contrasts are made between the Semmes-Weinstein esthesiometer and both the two-point discrimination and the point-localization tests. A new enhancement of the original Semmes-Weinstein Monofilament test, the Weinstein Enhanced Sensory Test * (WEST * ), is introduced. Advantages of the WEST are discussed.
