Patent ID: 7849857

Claim:
A tracheal ventilation device for sealing a trachea in order to ventilate a pediatric patient, the device comprising: a ventilation cannula defining a hollow tube shaft defining a tip at one free end thereof; and a cuff balloon that blocks the trachea below the glottis and is traversed by the ventilation cannula, said cuff balloon being made of a flexible soft film material, said cuff balloon in a fully inflated state in which said cuff balloon is freely deployed without restriction having a fully inflated diameter (D_CUFF) being larger than when said cuff balloon is in a filled state placed in the trachea, and said cuff balloon lying with folds against the trachea, MD_MP being the spacing of mounting points of said cuff balloon on the tube shaft; wherein for tracheal tubes with shaft inner diameters (ID) between 3.0 mm and 3.5 mm the fully inflated diameter D_CUFF of said cuff balloon has a range of values that lies between straight lines D_CUFF=0.75×MD_MP+5.00 mm and D_CUFF=0.75×MD_MP+3.25 mm and the distance between the tip of the tube and a distal mounting point of the cuff balloon on the tube shaft (SP_MD) has a range of values that lies between straight lines SP_MD=2.36×ID−0.11 mm and SP_MD=2.36×ID−1.86 mm; wherein for tracheal tubes with shaft inner diameters (ID) between 4.0 mm to 5.5 mm the fully inflated diameter D_CUFF of said cuff balloon is within a range of values between the straight lines D_CUFF=0.75×MD_MP+5.20 mm and D_CUFF=0.75×MD_MP+2.50 mm and SP_MD lies within a range of values between the straight lines SP_MD=2.36×ID+0.34 mm and SP_MD=2.36×ID−2.16 mm; and wherein for tracheal tubes with an inner diameter (ID) of 6.0 mm to 7.0 mm D_CUFF has a range of values that lies between the straight lines D_CUFF=0.75×MD_MP+5.50 mm and D_CUFF=0.75×MD_MP+2.50 mm and SP_MD has a range of values between the straight lines SP_MD+2.35×ID+0.64 mm and SP_MD=2.35×ID−2.46 mm.