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Breakage and deformation characteristics of hypodermic devices under static and dynamic loading
1Agricultural and Biosystems Engineering Department, College of Agriculture, Iowa State University, Ames 50011-3080, USA.
Objective:
To characterize the strength and limitations of hypodermic needles to reduce the risk of leaving broken needles in the flesh of animals.
Sample Population:
Skin of porcine cadavers. Procedure-Stainless steel needles of various gauges combined with aluminum and plastic hubs were subjected to standard test-stand conditions to compare strength under various loading regimens. A device that simulated animal motion was constructed to test breakage characteristics during animal movement.
Results:
Needles and needle/hub assemblies were resilient to needle breakage, except when bent needles were straightened and a load reapplied. Needle gauge and length drastically affected strength. For 16-and 20-gauge needles, a 1.0-in needle was 1.6 times stronger than a 1.5-in needle. Adding animal movement for 20-gauge, 1.5-in needles resulted in a 40% increase in hub failures for plastic, compared to aluminum hub needles.
Conclusions And Clinical Relevance:
Findings of this study are important considerations for meat packers to address in their Hazard Analysis and Critical Control Points plans.