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Cost-Reduced Version Of A Plastic Three-Piece Luer-Lock Needle Adapter
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RVN is a Medical Product Design Engineer, Plastics Product Development Consultant, Biomedical Engineer with world-class expertise in plastics product design involving injection, extrusion, rotation, and blow-molding, vacuum and thermal forming methods
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This consultant was approached to come up with a cost-reduced version of a plastic three-piece luer-lock needle adapter. The three-piece version was assembled using ultra-sonic means and the parts required precise fitments in order to mate with other manufacturers luer fitments. A two-piece version was submitted but soon failed due to the precise issue. The two-piece unit also had the continued cost-ineffective requirement of ultra-sonic attachment.
This consultant experimented with changing materials and eventually discovered an interesting phenomenon that is simple and obvious at the same time. In injection molding shrinkage of the parts is inevitable upon release from the hot mold. By using this predictable event one can mold two parts simultaneously in the same mold and by cooling one part quicker, be able to slide the hotter (slower chance unit to shrink) larger cylindrical locking unit easily over the cooler luer adapter part before it has a chance to shrink completely keeping it securely fastened in place eliminating the need to ultra-sonically weld the parts. This sounds all very simple but the truth is, at least six prototype hand mold were made before production tools were attempted. Much tweeking was required but the ultimate product was achieved and at a significant cost savings.
Read other articles by this KKAI Associate:
Design of Printed Circuit Board Customized Housing
| Medical Product Design Engineer, Plastics Product Development Consultant, Biomedical Engineer, plastics product design involving injection, extrusion, rotation, and blow-molding, vacuum and thermal forming methods | |
| Resume of BZU | mechanical engineer, metallurgical engineer, metallurgist, advanced materials processing consultant, production engineer, research and development consultant, powder metallurgy consultant, engineering failure analysis, accident investigation, accident reconstruction, specialist, forensic analysis expert, patent infringement, expert witness testimony, engineering consulting services |
| Resume of LGC | packaging engineer, engineering failure analysis, accident reconstruction consultant, specialist, forensic analysis investigation expert witness testimony, engineering consulting services |
| Resume of NSL | mechanical engineer, applied mathematics, quality assurance engineer, manager, engineering, engineering failure analysis, accident reconstruction consultant, specialist, forensic analysis investigation expert witness testimony, engineering consulting services |
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Kevin Kennedy & Associates, Inc.
Rapid Response Engineering® Solutions
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