| 摘要 |
<p>A device functioning as an epidural space location aid comprises a rotor-containing chamber fitted on to the end of a syringe vessel and with the syringe needle projecting from the end of the chamber and in fluid-flow communication via the chamber with the syringe vessel. The negative pressure experienced at the tip of the needle as it enters the epidural space of a patient, in use, is transmitted via the needle to the chamber and causes the rotor to rotate. The rotation is visible through the transparent walls of the chamber and as soon as it is seen it tells the practitioner that he has found the epidural space. The device, consisting of rotor-containing chamber with needle projecting from one end thereof, and with the other end of the device fitting on to the syringe vessel in use, may be manufactured as a self-contained unit; or it may form an inherent extension of the syringe vessel and be constructed as part of the syringe from the outset. <IMAGE></p> |
