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Disposable syringe with needle, with parts labelled: plunger, barrel, needle adaptor, needle hub, needle bevel, needle shaft According to the World Health Organization, about 90% of the medical syringes are used to administer drugs, 5% for vaccinations and 5% for other uses such as blood transfusions.
Development of the fully disposable hypodermic needle was spurred on in the 1950s for several reasons. The Korean War created blood shortages and in response disposable, sterile syringes were developed for collecting blood. The widespread immunization against polio during the period required the development of a fully disposable syringe system ...
Auto Disable (AD) syringes are designed as a single use syringe, with an internal mechanism blocking the barrel once depressed so it cannot be depressed again. The other type of syringe with a re-use prevention feature is the breaking plunger syringe. An internal mechanism cracks the syringe when the plunger is fully depressed to prevent ...
In syringes, plungers are constrained to linear motion as they are pulled and pushed within an outer tube or "barrel." The plunger allows the syringe to take in or expel fluid through an orifice at the open end of the barrel. In disposable syringes, the plunger is often made of plastic with a rubber tip that seals between itself and the barrel.
Researchers developed a new jet injection design by combining the drug reservoir, plunger and nozzle into a single-use disposable cartridge. The cartridge is placed onto the tip of the jet injector and, when activated, a rod pushes the plunger forward. This device is known as a disposable-cartridge jet injector (DCJI). [2]
As opposed to low dead space syringes, high dead space syringes are conventional needle and syringe designs. The term "high dead space" refers to the fluid remaining within the needle and between the syringe hub and the plunger. This space can be as high as 84 micro liters in conventional syringes. [2]
After this, Jalón worked on other designs, notably improvements on the disposable syringe, which was also a success. [13] His model had a plunger less prone to stick, made of plastic instead of glass, and with thin walls making disposal easier. [ 14 ]
The plunger is depressed to both draw up and dispense the liquid. Normal operation consists of depressing the plunger button to the first stop while the pipette is held in the air. The tip is then submerged in the liquid to be transported and the plunger is released in a slow and even manner. This draws the liquid up into the tip.
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