Abstract: A hand-held power injector is provided for injecting liquid, such as contrast media, into the vascular system of a mammal. The device comprises a pistol-shaped housing which encloses a battery-powdered D.C. motor for constant-rate delivery of liquid from a syringe. In a particular embodiment the hand-help power injector includes an engagement feature connecting the syringe and the power injector which prevents inadvertent activation of the power injector.

Abstract: An anti-clockspringing mechanism for a web-roll comprises a unitary lock member having a cylindrical body rotatably mounted in a sidewall of the cartridge. A flange on a web-spool on which the web-roll is wound is provided with an annular lip having alternately spaced lugs and notches. The body has a handle on one side thereof extending toward the exterior of the cartridge, and a lock member on the opposite side of the body extending into the interior cavity of the cartridge. The lock member is in alignment with a sector of the annular lip and lies in the plane of the annular lip. The lock member further comprises at least one shoulder projecting from the opposite side of the body.

Abstract: Disclosed herein is a carrier for a data storage disk. Such carrier comprises means for releasably capturing a disk so that it may be removed by a suitable disk release mechanism and used at a location spaced from the carrier, thereby avoiding any potential for disk damage due to contact with the carrier during disk rotation, and avoiding the need to precisely locate the carrier with a disk drive unit. Preferably, the carrier features enabling disk release are located so the disk release can be effected by the same disk-releasing mechanism no matter which of four different orientations the disk carrier has when inserted into the disk drive unit.