Limb‑O™ Breathing Circuit

Inhalation and Exhalation Limb in One Tube 

Limb‑O is a breath­ing cir­cuit con­sist­ing of a sin­gle tube that func­tions as both the inhala­tion and exha­la­tion limb. The lumen of the tube is divid­ed in half by a mem­brane, allow­ing heat trans­fer that, accord­ing to the man­u­fac­tur­er’s research, heats the inhaled air by 6.2°C at a flow rate of 4 L/min. Main­tain­ing an appro­pri­ate and sta­ble patient tem­per­a­ture is cru­cial in pre­vent­ing unin­tend­ed hypother­mia. Stud­ies indi­cate that the use of Limb‑O in anes­thetized patients result­ed in a tem­per­a­ture increase of 1°C above ambi­ent tem­per­a­ture after 5 min­utes and 2°C after 70 min­utes com­pared to con­ven­tion­al dual-limb cir­cuits [1]. Giv­en the impor­tance of pre­vent­ing unin­tend­ed hypother­mia and the poten­tial risks asso­ci­at­ed with it, we invite you to read an arti­cle on this top­ic.

Weight Reduction of the Syste  

Elim­i­nat­ing one limb reduces the sys­tem’s weight by 25% com­pared to equiv­a­lent dual-limb sys­tems and by 34% com­pared to coax­i­al sys­tems (man­u­fac­tur­er data). The flat mem­brane sur­face divid­ing the lumen of the cir­cuit in half also results in low­er flow resis­tance val­ues com­pared to a ful­ly cor­ru­gat­ed tube.

Wide Range of Configurations 

Limb‑O breath­ing cir­cuits come in a sin­gle size that can be used for infants (>4.5 kg), chil­dren, and adults, and are avail­able in var­i­ous lengths and configurations—designed for use with ven­ti­la­tors or anes­the­sia machines. The avail­able lengths of Limb‑O cir­cuits allow for prod­uct cus­tomiza­tion to meet spe­cif­ic needs. Limb‑O ver­sions with an inte­grat­ed cap­nom­e­try line or in a set with an HME elec­tro­sta­t­ic fil­ter are also avail­able. 

[1] Kalani, S., Khan­del­w­al, V., & Gup­ta, S. (2018). Com­par­i­son of Lim­bO TM Cir­cuit with Con­ven­tion­al Dual Limb Cir­cuit in Con­trolled Ven­ti­la­tion.