Project 3 - Design and Development of Disposable Syringe (Medical Technology)

A syringe is a simple reciprocating pump consisting of a plunger (though in modern syringes, it is actually a piston) that fits tightly within a cylindrical tube called a barrel. The plunger can be linearly pulled and pushed along the inside of the tube, allowing the syringe to take in and expel liquid or gas through a discharge orifice at the front (open) end of the tube. The open end of the syringe may be fitted with a hypodermic needle, a nozzle or tubing to direct the flow into and out of the barrel. Syringes are frequently used in clinical medicine to administer injections, infuse intravenous therapy into the bloodstream, apply compounds such as glue or lubricant, and draw/measure liquids. There are also prefilled syringes (disposable syringes marketed with liquid inside).

The global disposable syringes market size was valued at USD 13.45 billion in 2021 and is expected to expand at a compound annual growth rate (CAGR) of 6.12% from 2022 to 2030. The growth is attributed to the growing prevalence of chronic disorders, increasing adoption of safety syringes, and a growing number of surgeries globally. For instance, according to Mölnlycke Health Care AB in 2021, 70 million surgical procedures are performed every year in Europe.

A single-use disposable syringe. In the syringe, a reservoir is formed of two sheets of thermoplastic material having expanded central portions that form a pair of convex domes. Both of the domes are compressible, and a connecting member spaces apart the domes. In response to complete compression of both of the central portions together, the reservoir substantially collapses and each of the domes becomes concave to prevent the reservoir from being reformed and to prevent reuse of the syringe. After partial compression of both of the central portions together and partial collapse of the reservoir, the central portions expand to reform the reservoir and draw fluid into the reservoir, thereby aspirating a hypodermic needle.

Workbreakdown Structure:

Disposable Syringe Design (Solidworks):

Applications:

Patent:

1. A syringe comprising means making it possible to make the plunger integral with the end of the plunger stem during the first filling, and to cause the disconnection between these element during a refilling attempt.-->US5085638A
2. Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle using emptying means to expel or eject media, e.g. pistons, deformation of the ampoule, or telescoping of the ampoule by telescoping of ampoules or carpules with the syringe body -->US2478844A
3. Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle using emptying means to expel or eject media, e.g. pistons, deformation of the ampoule, or telescoping of the ampoule by compression of deformable ampoule or carpule wall.-->US2771879A
4. Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle using emptying means to expel or eject media, e.g. pistons, deformation of the ampoule, or telescoping of the ampoule by telescoping of ampoules or carpules with the syringe body->US2497562A