| 摘要 |
<p>IMPROVED HYPODERMIC SYRINGE An improvement for use with a particular type of hypodermic syringe having a non-retractable stopper located ahead of the drive piston so that the position of the non retractable stopper indicates the extent to which the drive piston has been advanced. The improvement is a substantially opaque sleeve, or coating applied to the transparent tubular body of the syringe, or a substantiallv opaque section of the tubular body itself, that is postioned to obstruct the user's view of the non-retractable stopper when the latter is in its original position as supplied by the manufacturer. The front end of the sleeve, coating, or section coincides axially with the front end o so that any forward movement of the non-retractable stopper will expose to view a portion of the non-retractable stopper.</p> |
