Device for needle-free injection, useful e.g. for subcutaneous or intramuscular administration, includes injection unit having a spring element that activates a propelling element to deliver medium

摘要

Injection device (A) for needle-free injection of a medium (3) includes an injection unit (1) with a spring element (6) which drives a propelling element (7) for delivery of (3). The new feature is that when the spring is under tension, the device is constructed so that parts having no function as regards the spring element are (essentially) free of spring tension.