Patent ID: 7329238
Filing Date: 2008-02-12
Classification: A61M

Abstract:
1. A medical device, comprising: a hollow barrel; a plunger displaceable within the barrel to eject fluid from the barrel; a needle assembly, comprising: a needle carrier in the barrel that is connectable with the needle hub, means for biasing the needle carrier rearwardly; means for releasably retaining the needle carrier against the bias of the biasing means, wherein the means for releasably retaining the needle carrier comprises a pin slot that is diagonal relative to axis of the needle and wherein the means for releasably retaining the needle carrier is located within the barrel; wherein, upon pushing the rearward end of the plunger forwardly after ejection of fluid from the barrel, the plunger causes the needle carrier to rotate such that the pin moves relative to the pin slot to enable the means for releasably retaining the needle carrier to release the needle carrier, so that the biasing means displaces the needle carrier rearwardly until the sharpened tip of the needle is shielded within the barrel.