Section 2 Medical Devices

*Medical Robotics - New Achievements*

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**8**

**11**

**1. Introduction**

**Chapter 2**

*and Matthaeus Grasl*

for intensive care ventilation is shown.

**Abstract**

CFD Analysis of Flow

Characteristics in a Jet

Laryngoscope and the

Different Application Forms of

The superimposed high-frequency jet ventilation is a jet ventilation technique

that allows the surgeon to operate in a system open to the outside endoscopic surgery in the area of the vocal cord level. Although the clinical application is uncomplicated, the possible mechanisms of the gas flow in the jet laryngoscope are largely unknown. In the performed calculations for this work, the CFD software package Fluent is used with the preprocessor GAMBIT. After creating the geometry and networking of the jet laryngoscope in the preprocessor GAMBIT, the boundary conditions and input parameters in the solver are defined. This is followed by iterative calculation using Fluent and the tabulation of results. Ventilation is provided by an electronic respirator specially developed for the endoscope. There is a bidirectional gas flow in the jet laryngoscope. The free jet characteristics of the jet beam can be confirmed. Entrainment depends on pressure and on the gas velocity. The arrangement of the nozzles enables jet ventilation in stenosis. CFD analysis enables the representation of a continuous progress of the pressure as well as the representation of the continuous profile of the velocity in the investigated endoscope. Additionally the practical application

**Keywords:** jet ventilation, superimposed high-frequency jet ventilation (SHFJV),

Jet ventilation in medicine means the administration of small to the smallest gas volumes (1–2 ml/kilogram per body weight) with a high frequency from a nozzle or special adaptors to ventilate a patient. This ventilation is used in surgical surgery as well as in intensive care medicine. In contrast to the dynamics of a sustained flight jet beam, the jet stream in medical application is only supposed to expand the

computational fluid dynamics (CFD), laryngeal stenosis, jet respirator,

combined high-frequency jet ventilation, flow behavior

Superimposed Jet Ventilation

*Alexander Aloy, Simon Hell, Andreas Nowak* 

#### **Chapter 2**
