| 摘要 |
The instant invention consists of an inner cannula of hosing amenable to transport of a liquid coupled with an outer cannula of hosing amenable to transport of a gas. As respects one embodiment, affixed to outer walling of the inner cannula and to inner walling of the outer cannula are rigid struts, typically three or four, at 120 DEG or right angles with respect to one another at various points along the respective lengths of the cannulae that serve to maintain separation of the cannulae from one another at times when the inner cannula is filled with a liquid and the outer cannula is filled with a gas under pressure. A second embodiment is strut free. Each cannula has an ingress end whereat a liquid is introduced into the inner cannula and whereat a gas is introduced into the outer cannula. Each cannula likewise has an egress end whereat the liquid is expelled typically from a nozzle thereat located and the gas is amenable to discharge via the opening of a valve component of the instant invention likewise thereat located. Moreover, the instant invention is characterized by the presence of alarm modalities serving to alert a user thereof to the fact of an unanticipated rise or drop in intercannular gas pressure. |
