Ergonomic design and evaluation of new surgical scissors

Shimomura, Yoshihiro; Shirakawa, Hironori; Sekine, Masato; Katsuura, Tetsuo; Igarashi, Tatsuo

doi:10.1080/00140139.2015.1037362

Cited by 11 publications

(5 citation statements)

References 19 publications

(31 reference statements)

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“…Berguer and Harper conducted a unidimensional evaluation using a simple rating for factors like difficulty and cutting ability during scissor use without conducting statistical analysis [ 4 , 5 ]. Shimomura et al conducted to objectively measure the fatigue experienced by surgeons when using scissors by employing electromyography to monitor muscle activity [ 13 ]. In comparison to the studies mentioned, adopting the time-intensity analysis with two-dimensional values in our research allowed us to statistically demonstrate the reproducibility of surgeons' perceptual values.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Scissor Glide Characteristics Through Surgeons' Subjective Assessment: The Application of Nitriding in Scissor Hardening Tests

Ota,

Shiozawa,

Watanabe

et al. 2024

Cureus

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Introduction: In robotic surgery, studies on providing tactile feedback to users are ongoing. However, the accuracy of the subjective sensations of surgeons, as users, has been largely unassessed. This study aimed to assess the validity of surgeons' subjective evaluations of scissors resistance through interindividual, inter-surgeon, and objective evaluations. Furthermore, in this study, we explored the possibility of using nitriding to increase the hardness of the scissors and assessed changes in subjective resistance values before and after nitriding using this approach. Method: Five surgeons conducted validation of five curved surgical scissors (145 mm; Arakawa Seisakujyo Co., Ltd., Tokyo, Japan) and assessed their subjective resistance using a scale from 0 to 10, where a rating of 10 signified significant resistance impeding the scissors' closure. The temporal changes in subjective resistance values, from maximum open to close, were graphically recorded. To demonstrate the reproducibility of subjective resistance values, the subjective resistance values of the same control scissors were measured at intervals of at least two weeks, and the correlation coefficient was calculated. To analyze the closing characteristics of subjective resistance values between different pairs of scissors, the effect of scissor type and scissor closure position was compared as two independent variables using a two-factor analysis of variance. A comparative evaluation was conducted to assess the frictional properties of scissors after nitriding, comparing the subjective assessment by surgeons with the objective assessment using a digital force gauge. Results: The correlation coefficient of subjective resistance values measured by surgeons demonstrated a high reproducibility of 0.746. A two-factor analysis of variance conducted on subjective resistance values demonstrated the presence of a primary effect for the sample factor (scissors), as well as for the position factor (closing process), with the additional observation of the interaction between these two factors. The results from the two-factor analysis of variance above provide evidence supporting the validity of the subjective resistance measurements. There was a significant increase in subjective resistance after the nitriding process. The graph of subjective resistance values and objective resistance values showed similarity. Conclusions: The surgeons' subjective assessment of scissors resistance showed high reproducibility and validity, as evidenced by distinguishable differences in scissor movement interactions and pre- and post-nitriding resistance. Further studies are warranted to expand on these findings.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Scissor Glide Characteristics Through Surgeons' Subjective Assessment: The Application of Nitriding in Scissor Hardening Tests

Ota,

Shiozawa,

Watanabe

et al. 2024

Cureus

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“…Ergonomic interventions in the surgical environment are known to maximize surgical efficiency and safety [ 8 , 9 ]. Shimomura et al designed a new handle for scissors used in surgery, evaluated its effectiveness in terms of usability, and reported that this new handle design reduced muscle strain and improved work efficiency [ 20 ]. To the best of our knowledge, there have been studies of tactile sensation and ergonomic burden reduction, but no studies to date on comfort during use.…”

Section: Discussionmentioning

confidence: 99%

A Low Mean Closing Load and a Decrease in Load Change at the Tip Increase the Comfort of Scissors

Ota,

Kaneda,

Maeda

et al. 2024

Cureus

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Introduction During surgery, surgeons intuitively recognize when they are using dull scissors and find them difficult to use. The purpose of this study was to objectively evaluate the physical characteristics of scissors and the comfort reported by surgeons to develop objective quality control standards for scissors used in surgery. Methods Sensory and measurement tests were conducted to evaluate the comfort and physical characteristics of ten pairs of Cooper scissors. As a sensory test, thirty-one volunteer surgeons opened and closed the scissors and selected three that felt comfortable and three that were uncomfortable. The results were scored. For measurement, a load was applied to the handle of the scissors. The load pressure and displacement of the width between each handle when the scissors were closed were measured. Results A strong negative correlation was found between the total comfort score and the mean load value between sensory and measurement tests (r=-0.717, p=0.0195). The correlation between the total score and the change in load at the tip showed a moderate negative correlation (r=-0.687, p=0.0282). Multiple regression analysis showed that the change in load at the tip was an independent factor affecting the total score. Conclusions Surgeons consider scissors with a low mean load required to close the scissors and a small change in load at the tip to be comfortable. The mean load on scissors and the change in load at the tip should be considered in the development of quality control standards for scissors used in surgery.

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“…With scissors being a hand tool, the ergonomic design of scissors is of importance to their ease of use [4]. Where design-based solutions are not available, manual practice is the alternative [5].…”

Section: Introductionmentioning

confidence: 99%

Review on Accessibility of Scissors for the Left-handed and Ambidextrous, and People with Fine Motor Difficulties in the Digital Era

Chan

2023

IJORAS

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There had been efforts to provide single-handed tools for small-scale and one-time work, from the industrial to the modern age. This is notable in the case of scissors. The modern era provides more options to produce scissors that fit the individual. This is made possible through 3D printing and rapid prototyping. However, accommodating the exact personal preferences of users remains a persistent problem, especially for the left-handed and ambidextrous, or those who have problems with fine motor skills. The other alternative in the digital era is coaching and instructions that are available through digital platforms for the purpose of helping people practice fine motor skills in the use of scissors. However, like other tutoring methods, their outcomes depend on the individual ability of the learners.

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Ergonomic design and evaluation of new surgical scissors

Abstract: A new scissors handle was designed that has the eye rings modified to fit the thumb and ring finger. The newly designed scissors reduced muscle load and enabled active use of the right hand. In evaluation by surgeons, task performance improved in addition to the decrease in muscle load.

Cited by 11 publications

References 19 publications

Evaluation of Scissor Glide Characteristics Through Surgeons' Subjective Assessment: The Application of Nitriding in Scissor Hardening Tests

Evaluation of Scissor Glide Characteristics Through Surgeons' Subjective Assessment: The Application of Nitriding in Scissor Hardening Tests

A Low Mean Closing Load and a Decrease in Load Change at the Tip Increase the Comfort of Scissors

Review on Accessibility of Scissors for the Left-handed and Ambidextrous, and People with Fine Motor Difficulties in the Digital Era

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