Development of an ergonomic four-finger-push manual pipette design

Area of Science:

• Ergonomics
• Human Factors Engineering
• Occupational Health

Background:

• Traditional pipettes often require awkward hand and wrist postures, contributing to discomfort and potential work-related musculoskeletal disorders (WMSDs).
• Existing pipette designs may not adequately consider hand anatomy and anthropometry, leading to suboptimal user experience and increased risk factors.

Purpose of the Study:

• To develop and evaluate novel pipette designs operated by four fingers, incorporating hand anatomy and anthropometry.
• To compare the ergonomic performance of the new pipette designs against traditional thumb-push pipettes.

Main Methods:

• Evaluated muscle activity, wrist posture (flexion, radial/ulnar deviation), and subjective discomfort ratings for upper extremities.
• Conducted user preference tests comparing the four-finger pipette designs with a traditional thumb-push pipette.

Main Results:

• The four-finger ergonomic pipette design demonstrated significant reductions in muscle exertion (25% aspiration, 35% dispensing) and awkward wrist posture (33% reduction).
• Participants reported decreased perceived discomfort in the wrist, hand, and lower arm when using the new designs.
• A strong user preference (9 out of 10 participants) was observed for the new pipette designs over the traditional model.

Conclusions:

• The developed four-finger pipette design effectively mitigates ergonomic risk factors associated with pipette use.
• This ergonomic innovation has the potential to reduce pain and the incidence of WMSDs in laboratory and clinical settings.
• The findings support the adoption of anthropometrically-informed designs for laboratory tools to enhance user well-being.