IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
Design and Analysis of Video Type Disposal Laryngoscope Lingaraj Angadi1, Manu H C2, Somanagouda Goudra3, Jaikumar V T4, Dr.P B Shetty5 UG Student, Department of Mechanical Engineering, NMIT Bangalore, Karnataka, India1-4 Professor, Department of Mechanical Engineering, NMIT Bangalore, Karnataka, India 5
Abstract Laryngoscopy is a medical device which is used to examination and visualization of larynx by destructing the upper airway structure and it is also used for tracheal intubation and air way management in modern anesthesia. This paper present design and analysis of video type disposal laryngoscope. It has I-shaped curved and it act as cantilever beam when intubation. Analysis can be calculated by using numerical and FEM methods. Key words: laryngoscope, intubation, cost video laryngoscopes as new intubation
1. Introduction
devices to assist in difficult airway Video [1-2] laryngoscopy presents a new approach for the management of the difficult and rescue airway. There is little available
evidence
to
compare
the
management. indicate
Clinical superiority
[3-8]
studies
of
video
laryngoscopes relative to conventional direct laryngoscopy in selected patients.
performance features of these devices in true difficult laryngoscopy. The incidence of difficult
direct
intubation in the
They are therefore an important addition
intensive care unit (ICU) is estimated to be
to the armamentarium of any clinician
as high as 20%. Recent advances in video-
performing endotracheal intubation. We
technology have led to the development of IDL - International Digital Library
1|P a g e
Copyright@IDL-2017
IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
present practical video laryngoscopes with
packed and at the end of this cannel has
respect to design, clinical efficacy, and
transparent glass to view the larynx.
safety aspects .This video type disposal laryngoscope has low cost. It has deposal type laryngoscope because to prevent
Software used for designing: CATIA V5 Isometric view
antigen from pre patient. It contains the Ishaped curved beam because; in one channel anastheologist insert the camera and
other
channel
for
inserting
endotracheal tube. This is used for
Fig 3.1 Isometric view
inserting endotracheal tube and also for Side view
examines the larynx.
2. Objectives
It has low cost
disposal
and
video
type
laryngoscope
simple design and light weight
It has corrosion resistance material
Fig 3.2 Side view
4. Material selection ABS (Acrylonitrile-Butadine-styrine)
3. Design
Acrylonitrile Butadiene Styrene (ABS)
It has I-shaped curved beam here two
is
an
channels are present in one channel for
amorphous polymer. “Thermoplastic”
inserting endotracheal (ET) tube and other
(as opposed to “thermo set”) has to do
channel for holding the camera. Fillet
with the way the material responds to
given to all sharp edges. It contains cap for
heat. Thermoplastics become liquid
holding purpose. Camera channel fully
(i.e. have a “glass transition”) at a certain
IDL - International Digital Library
2|P a g e
opaque
thermoplastic
temperature (221
and
degrees Copyright@IDL-2017
IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
Fahrenheit in the case of ABS plastic). Density
D1505
g/cc
1.03
Tensile Strength @Yield
D638
psi
>6000
Elongation @ Break
D638
%
40
Flexural Modulus
D790
psi
300,000
Flexural Yield Strength
D790
psi
10,700
Durometer
D785
R scale
102
Izod Impact
D256
2 ft lbs/in
7.7
Vicat Softening Temp.
D1525
°F
219°
Heat Deflection Temp. 66 psi
D648
°F
201°
Flammability
UL94
UL94
HB
ABS is a low cost engineering plastic that is easy to machine and fabricate. ABS is an ideal material for structural applications when impact resistance, strength, and stiffness are required. It is widely
used
for
machining
pre-
production prototypes since it has excellent dimensional stability and is easy to paint and glue. Natural (beige) ABS
and
black
ABS
are
FDA
compliant for use in food processing applications. The following physical property information is based on typical values of the base acrylonitrilebutadiene-styrene resin.
Excellent impact resistance
Good machinability
Excellent aesthetic qualities
Easy to paint and glue
Good strength and stiffness
Low cost
Let Mb = Applied bending moment r i = Inner radius of curved beam
Table 4.1 Properties of ABS material ro = Outer radius of curved beam
[9]
rc= Radius of centroidal axis Property
ASTM Test Method
Units
Nominal Value
rn = Radius of neutral axis cl = Central line of curvature
IDL - International Digital Library
3|P a g e
Copyright@IDL-2017
IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
5. Theoretical analysis using numerical method
Total area A= a1+a2+a3 A = (30*2.5) + (15*4) + (30*2.5) A= 210 mm2 Length of the centroidal axis from their reference line AB đ?‘‹=
đ?‘Ž1đ?‘‹1+đ?‘Ž2đ?‘‹2+đ?‘Ž3đ?‘‹3
đ?‘‹=
đ?‘Ž1+đ?‘Ž2+đ?‘Ž3 75∗1.25 + 60∗10 +(75∗18.75) 210
đ?‘‹ = 10 mm Radius of centroidal axis rc= ri +đ?‘‹ rc= 40+10 rc = 50 mm Fig5.1: Centroidal axis
Radius of Neutral axis rn = rn =
đ??´ đ?‘?đ?‘– ln
đ?‘&#x;đ?‘– +đ?‘Žđ?‘– đ?‘&#x;đ?‘–
30 ln
65 40
+đ?‘?2 ln
đ?‘&#x;0−đ?‘Ž 0 đ?‘&#x;đ?‘– +đ?‘Žđ?‘–
+đ?‘?0 ln
đ?‘&#x;đ?‘œ đ?‘&#x;0−đ?‘Ž 0
210 +4 ln
57 .5 42 .5
+30 ��
60 57 .5
rn = 48.80mm Distance of neutral axis from central axis e = r c - rn e = 50 – 48.803 = 1.197 mm Distance of inner radius from neutral axis Fig 5.2: Cross section of I-beam Area calculation of “I� beam,
ci = rn – ri ci = 48.803 – 4
IDL - International Digital Library
4|P a g e
Copyright@IDL-2017
IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017

ci = 8.803 mm
Importing CATIA design file in IGS
Distance of outer radius from neutral axis co = ro –rn c0= 60- 48.803

Select structural

Define element type

Define material model and gave
co = 11 .197 mm
young’s modulus and poisons
Bending moment
ratio
Mb = F* L Mb = 35*70 Mb = 2450 N-m. Combined stress at inner fibre ď łbi =
đ??šđ?‘‘ đ??´

Meshing

Apply boundary condition

Solve

Result
Displacement: external force 35N
đ?‘€đ?‘? đ??śđ?‘–
+đ??´
35
đ?‘’ đ?‘&#x;đ?‘– 2450 ∗8.803
ď łbi = 210 + 210 ∗1.197 ∗40 ď łbi = 2.310 N/mm2 Combined stress at outer fiber ď łbo =
đ??šđ?‘‘ đ??´ 35
-
đ?‘€đ?‘? đ??ś0
Fig 6.1 Displacement
đ??´ đ?‘’ đ?‘&#x;0 2450 ∗11.197
ď łbo = 210 - 210 ∗1.197∗60
Normal stress: External force 35N
ď łbo = -1.652 N/mm2 Max Stress = 2.310 N/mm2
6. Analysis using finite element method (FEM) Software used for analysis: ANSYS16
Fig 6.2: Normal stress
Steps involved IDL - International Digital Library
5|P a g e
Copyright@IDL-2017
IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
Max stress: 2.5 MPa
[2] Flores AS, Garber SM, Niesen AD,
So error = 8%
Long TR, Lynch JJ, Wass CT, Clinical
7. Fabrication of prototype and final assembly
the prototype and it suitable for ABS material.3D printing means the action or process of making a physical object from a three-dimensional digital model, typically by laying down many thin layers of a material in succession. In 3D printing first import the geometry from the design software in STP or STL format. Injection process
laryngoscope: a case series venturing beyond the normal airway. J Clin Anesth
3D printing [10] is best for manufacturing
molding
application of a novel video camera
has
suitable
for
production level.
2010; [3] Peterson GN, Domino KB, Caplan RA, Posner KL, Lee LA, Cheney FW. Management of the difficult airway: a closed claims analysis. Anesthesiology 2005;103:33–9. [4] Cooper GM, McClure JH. Anaesthesia chapter
from saving
reviewing
maternal
pregnancy
safer.
mothers’ deaths
Br
to
J
lives: make
Anaesth
2008;100:17–22. [5] Andruszkiewicz P, Dec M, Kan´ski A,
Conclusion
Becler R. Fibreoptic intubation in awake
We propose that smartphone can be
patients.
accurate enough to classify laryngoscope’s
2010;42(4):194–6.
light as adequate to perform laryngoscopy.
[6] Benumof JL. Management of the
Our conclusion is that ABS material and
difficult
smartphone has more flexible and low cost
emphasis on awake tracheal intubation.
for video type laryngoscope.
Anesthesiology 1991;75:1087–110.
Anestezjol
adult
airway
Intens
with
Ter
special
[7] Flores AS, Garber SM, Niesen AD,
References
Long TR, Lynch JJ, Wass CT, Clinical
[1] Stephen R Collins MD, Direct and
application of a novel video camera
Indirect Laryngoscopy: Equipment and
laryngoscope: a case series venturing
Techniques. IDL - International Digital Library
6|P a g e
Copyright@IDL-2017
IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
beyond the normal airway. J Clin Anesth 2010; [8]Lai HY, Chen IH, Chen A, Hwang FY, Lee Y,The use of the GlideScope for tracheal
intubation
in
patients
with
ankylosing spondylitis. Br J Anaesth 2006 [9] plastic international sheet, rod , tube, film ,cut to size [10] Fabricated: The New World of 3D Printing (ebook) by Hod Lipson
IDL - International Digital Library
7|P a g e
Copyright@IDL-2017