Sukhupragarn Wariya, Rosenblatt William H
Department of Anesthesiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.
J Med Assoc Thai. 2011 Aug;94(8):972-7.
To evaluate oxygen flow through several transtracheal devices in native and right angle kinked states.
Eight catheter-over-needle, and two oxygen conveyance devices (Enk Flow Modulator 10 L/min flow and Manujet III Jet device 15, 30, 50 psi) were examined. Oxygen flow from each catheter was measured five times with three insufflation patterns [continuous insufflation, one second insufflation/one second pause (1:1), one second insufflation/three second pause (1:3)] in both native, and 90 degree kinked condition.
During continuous insufflation, all but the 20G catheter delivered flows of more than 7 L/m with all conveyance pressures. With a 1:1 insufflation/pause ratio, catheters smaller than 16G were able to deliver 7 L/min flow only with driving pressures of 30 and 50 psi. With a 1:3 insufflation ratio, no catheter could deliver adequate flow with 15 psi (manujet) or with the Enk Flow modulator Only the Cook catheter and 14G Ravussin were capable at 30 psi. Only the Cook Transtracheal Jet Ventilation Catheter could deliver adequate flow in kinked position, but only at 50 psi.
Needle-catheters designed for vascular access are marginally capable of effective TJV. The Cook Transtracheal Jet Ventilation catheter proved to be the most robust device in the kinked state, but only when combined with a high-pressure oxygen conveyance system.
评估几种经气管装置在自然状态和直角弯曲状态下的氧气流量。
检查了八根导管套针以及两种氧气输送装置（Enk流量调节器，流量为10L/min；Manujet III喷射装置，压力为15、30、50psi）。在自然状态和90度弯曲状态下，使用三种吹气模式[持续吹气、一秒吹气/一秒停顿（1:1）、一秒吹气/三秒停顿（1:3）]对每根导管的氧气流量进行了五次测量。
在持续吹气过程中，除20G导管外，所有导管在所有输送压力下的流量均超过7L/m。在1:1吹气/停顿比例下，小于16G的导管仅在30和50psi的驱动压力下能够输送7L/min的流量。在1:3吹气比例下，没有导管能够在15psi（Manujet）或Enk流量调节器下输送足够的流量。只有Cook导管和14G Ravussin导管在30psi时能够做到。只有Cook经气管喷射通气导管在弯曲位置能够输送足够的流量，但仅在50psi时。
设计用于血管穿刺的针导管勉强能够进行有效的经气管喷射通气。Cook经气管喷射通气导管在弯曲状态下被证明是最坚固的装置，但仅当与高压氧气输送系统结合使用时。
