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FAQ Medical Devices

Medical Devices

Q. I would like to change over to a KOKEN cannula. What should I do?

A. The size of every KOKEN cannula is represented by its outer diameter. Choose one with an outer diameter that is closest to the cannula you are currently using. The outer diameter of a cannula is usually represented as O.D. xx.


Q. Various types of cannula are available. Which type should I choose?

A. Cannulas consist mainly of two types: cuffed and cuffless. Cuffed cannulas (KOKEN Neo Breath series) are indicated for those who need mechanical ventilation and those who are likely to have difficulty in swallowing. For those able to speak with laryngeal functions preserved, the combination of a fenestrated cannula (KOKEN Neo Breath Speech Type, Speech Cannula or KOKEN Tracheal Cannula PP Speech Type) and a speech valve, which allows expiratory air to pass the vocal cord, is recommended. For those with thick sputum, cannulas with an exchangeable inner tube (KOKEN Neo Breath Speech Type, KOKEN Neo Breath Double-Tube Type, KOKEN Double-Tube Tracheal Cannula and KOKEN Tracheal Cannula PP Double-Tube Type) are suitable. A Tracheal Opening Retainer or Tracheal Stoma Retainer is preferable for those in a stable condition who only require the tracheal opening to be retained. In addition, the T-Tube may be recommended for those with tracheal stenosis. Consult a specialist such as an otolaryngologist to choose an appropriate cannula.


Q. I am not sure about the differences between Tracheal Opening Retainer and Tracheal Stoma Retainer.

A. These tubes are both placed in the throat to retain the tracheal opening. Tracheal Opening Retainer is made entirely of soft silicone. On the other hand, Tracheal Stoma Retainer has a plastic part on the outer flange, to which an optional part such as a cap used in respiration training and speech (Airway Cap) or a valve for speech (One-way Valve) can be attached. This feature may possibly lead patients to complain of pain or require them to exert more effort to insert the tube into the opening. Use Tracheal Opening Retainer if you give priority to softness or Tracheal Stoma Retainer if you need to use the cap or the speech valve.


Q. Can a KOKEN cannula be connected to a mechanical ventilator or a heat & moisture exchanger ?

A. A mechanical ventilator can be connected to a KOKEN Neo Breath series cannula. A heat & moisture exchanger can be attached to a KOKEN Neo Breath series cannula, KOKEN Tracheal Cannula PP Single-Tube Type and KOKEN Tracheal Cannula PP Double-Tube Type. It can also be attached to KOKEN Tracheal Cannula PP Speech Type and Tracheal Stoma Retainer if an optional part is used.