Patent ID: 7981081

Claim:
An injection mechanism for injecting fluid into a targeted tissue layer comprising: a primary reservoir for storing fluid prior to injection and filling a secondary reservoir with a dosage amount of fluid to be injected; a secondary reservoir for receiving and holding the dosage amount of fluid to be injected from the first reservoir, wherein the secondary reservoir is in series with the primary reservoir and has a smaller cross-sectional area than the cross-sectional area of the primary reservoir; and a needle connecting portion comprising a sliding seal, a needle assembly, and a needle stop, wherein the sliding seal comprises a needle septum disposed at least partially within the secondary reservoir and having a cross-sectional area smaller than the cross-sectional area of the primary reservoir; and a patient needle disposed at least partially within the needle septum of the sliding seal, and for penetrating the skin of the patient to inject the dosage amount of fluid of the secondary reservoir in the targeted tissue layer during injection, wherein said patient needle has an exposed length of between approximately 0.5 mm and approximately 5 mm.