University of Pittsburgh Senior Design – BioE 1160/1161. Redesign of a Safety Syringe. Jessica Chechak Jason Keiser Ellsworth Weatherby April 18, 2005. Problem Statement Proposed Solution Specific Aims Design Considerations Design Requirements Design Process Initial Design
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University of Pittsburgh
Senior Design – BioE 1160/1161
Redesign of a Safety Syringe
April 18, 2005
We propose the creation of a single use safety syringe that includes several categories of safer device features:
The initial design utilized a push button to retract the protective shield.
This facet was redesigned to reduce the complexity of the design and to reduce the cost of mass manufacturing.
The retractable needle mechanism was initially activated when the plunger reached the bottom of the syringe body.
This was modified to make the retractable needle mechanism user activated.
Initially the syringe was intended to be pre-filled; this modification allowed the syringe to be sold unfilled.
The protective shield was designed to allow the user to slide it up and down the syringe body without having to compress a button, thus simplifying the device.
The retractable needle is activated by a spring loaded mechanism located in the luer of the needle.
This system is triggered by a 5lb downward force on the plunger by the user after the medication has been delivered.
The protective cap remains locked into position before and after use until a force of 1lb is applied.
Final Design: Before Use
After all questions were answered “Yes” prototyping began.
Ready To Inject
Ready For Disposal
Quality Systems Considerations
Cost of Safety devices:
Cost of Post-Exposure Prophylaxis:
Frost & Sullivan (www.chetday.com/medmistakes.html)
Cost of safety devices are offset by cost of post-exposure prophylaxis and follow up in medium and high-risk scenarios
This is our initial project timeline.
We remained on schedule within a day or two of our initial project deadlines. We received our initial prototype earlier than expected. This gave us time for several redesigns to produce the final prototype.
A feature that requires the operator to activate the safety mechanism, and failure to do so leaves the operator unprotected
A safety feature that remains in effect before, during and after use, the operator does not need to "activate" the safety feature
Integrated Safety Design
The device has the safety feature included into its design and it can not be removed or inactivated. This is the preferred safety feature.
Retractable needle safety syringe