Medication is delivered by depressing the unit reservoir.
After the dose is expressed, the collapsed reservoir and a one-way valve inhibit refill, making it impossible to reuse the syringe. Because the drug is premeasured, accuracy of the dose is assured. Who would have thought that packaging could make such a global impact. Every aspect of this device is a bridge between design and the task at hand. It consists of a molded piece of plastic filled under sterile conditions with the solution to be administered.