Patent ID: 7449009
Filing Date: 2008-11-11
Classification: A61M

Abstract:
1. A device for needle-free injection of a medium into the tissue of a human or an animal, comprising a needle-free injection device comprising a first chamber accommodating a pre-injection medium for production of a high-pressure jet of the pre-injection medium for producing an injection channel by means of a high pressure and a small volume, and a main injection device comprsing a second chamber accommodating a medium to be injected, the second chamber medium being injected with a great volume and a low pressure in comparison with the volume and pressure of the pre-injection device; wherein a nozzle intended to be set onto the skin is connected with the chamber of the pre-injection device and with the outlet of the main injection device by way of a kick-back valve, and wherein a pressure-production device that is connected with the chamber of the pre-injection device is configured to produce a high-pressure jet from the nozzle that penetrates the tissue, whereby the chamber of the pre-injection device has a volume sized exclusively for producing an injection channel in the tissue, and the chamber of the main injection device ha a volume intended for the medium to be injected; wherein the pre-injection device further comprises a piston; and whrein a membrane is part of the piston, with which the chamber of the injection medium is connected, wherein a pusher is located inside the piston, and wherein when the pressure in the chamber increases, said membrane is deflected in the direction of the pusher to activate the trigger by the way of the pusher.