Human Factors – Measuring and Visualizing Ergonomic Improvements in Clip Appliers
Quantifying human factor ergonomic design parameters.
A clip applier is a surgical instrument used to place ligation clips, commonly used in procedures to close blood vessels or other tubular structures. Aesculap has introduced a new generation of clip appliers featuring an innovative handle geometry designed to enhance user comfort by reducing pressure points on surgeons’ hands.
Initial user feedback has been positive, highlighting the improved ergonomics. To validate these subjective impressions with objective data, Aesculap sought to quantify the ergonomic benefits of the new design. We had the opportunity to support Aesculap in our Human Factors test bench by conducting these measurements.
Identification of relevant human factors parameters – reproducing real-world usage in a controlled test environment
Our human factors experts ensured comparable conditions for different clip appliers, including previous models and competitor products. This was accomplished by a standardized test setup. This setup replicated realistic grip positions based on joint angles and engagement angles derived from actual surgical use. The measurement captured a static representation of the pressure distribution between the clip applier’s handle and the user’s hand. For this purpose, pressure-sensitive films were applied to the test participant’s hand. The force application was defined by the complete closure of a clip, representing the fulfilment of the instrument’s intended use.
Grip comfort & pressure mapping – clear insights through data visualisation
During the conceptual phase, we developed an interaction design to ensure that the companion is not overwhelmed by the controls. At the same time, all relevant information and actions must be clearly and intuitively conveyed. Optimising the human-machine interaction was crucial, allowing users to understand and follow the automated steps of the Scalamobil.
The recorded measurement data was digitized and mapped onto a 3D hand model to provide a detailed visualization of pressure distribution. The pressure values were color-coded according to established discomfort thresholds, enabling an intuitive assessment of potential strain areas. Additionally, a quantified evaluation of the pressure-exposed contact areas was conducted, allowing for a direct comparison of different handle geometries. This analysis provided objective insights into ergonomic performance and facilitated data-driven optimization of the design. The ergonomic value added to the new handle geometries becomes particularly clear when comparing the different variants.
Unlock measurable ergonomic gains
The results were compiled into a measurement report, providing a clear and structured summary of the findings. This report serves not only as a basis for further design optimization but also as a valuable tool for communicating the ergonomic benefits and improvements of the system.
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