| 摘要 |
<p>An instrument for injecting and withdrawing fluids including an elastomeric membrane (36) in communication with the chamber (30) of the instrument from which fluids are injected or into which they are withdrawn, in which the membrane expands and contracts with increasing and decreasing pressure in the chamber, providing both a visual and a tactile indication of the pressure of injection or withdrawal, and a pressure relief.</p> |
