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Laminar Air Flow

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Moderator 

Dr. Surendra U Kamath

Dr. Anup Kumar

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•  An air flow in which entire body of airwithin a confined area moves with

• uniform velocity

•  along parallel flow

•  with minimum air turbulence.

DF!"!#!$"

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 A%%L!&A#!$"

  laminar air flows have a variety of applicationssuch as '

• (uality control labs of pharmaceutical

Industries • (uality control labs of food processing

industries 

• (uality control labs of micro circuit and

electronic assembly and manufacturingapplications.

• Deoxy Ribonucleic Acid Thermo cycling 

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 A%%L!&A#!$"

• )eneral Laboratory applications inBiotechnology 

• )eneral Laboratory applicationsMicrobiology 

• )eneral Laboratory applications Tissue

ulture • )eneral Laboratory applications !enetic

engineering

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*here are we concerned

about+.

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,!S#$-

• Laminar flow

ventilation was first

pioneered by "ir

#ohn harnley  in the 

/012s

*, D$ * "D

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*, D$ * "D

LAM!"A- A!- FL$*

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$IT%RAT&R%

%'ID%(%"

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• $idwell)s Trial • incidence of 3oint

sepsis at reoperation

was 425 less

body e6haust suitsfurther reduced to

745.

the incidence of sepsis

282.115

 

the British Medical Journal in /097

vertical laminar flow

ventilation

performed better than

hori:ontal ventilation

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More recent literature

• *olton and Ridgway

•  Fit:;erald• van !riethuysen et al +,,- 

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• D!-

-LA#!$"S,

!%

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#-A"SM!SS!$" &&L !" $#"usceptible *osts

&lientsService providers

 Ancillary Staff 

&ommunity members

Reservoirs

%eople*ater and solutions

!nstruments and other items

>uipment

Soil and air 

laces of exit-espiratory? ;enitourinary?

and vascular systems

)astrointestinal tract

S@in

Mucous membranes

%lacenta

laces of entry

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Types of air supply

Air is supplied to the operating theatre by/

• /. %lenum entilation

• 7. Laminar Flow entilation BUltra

&lean entilation

• 0. 1all Mounted Air onditioners• 2. 3ree4standing Air onditioners

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%L"UM "#!LLA#!$"

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LAM!"A- A!- FL$*

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%L"UM "#!LLA#!$" S LAF

• /18 72 &,A")S

C,-

• 428/42cfuCM

• !"F!$" -A# !"&LA" SU-)-

45

• E228422C,-

• /$ &FUCM

• !"F!$" -A#

/5

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#%S $F LAM!"A- A!- FL$*

•'%RTIAL

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,$-!G$"#AL LAF

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 ADA"#A)

• 'ertical $aminar  3low &lean -oom

Space has the additional advantage over

the ,ori:ontal System in that

• particles are removed by ;ravity as well as

by airflow. #his is particularly important in

the case of heavy

• particles that can fall out and settle? via a

,ori:ontal 3low System

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D!SADA"#A)

• D&-ASS -SA#AL!# $F

$%-A#!") -$$M

• L!),# A"D (U!%M"# &$M !" #,

*A

• M$M"# $F %-S$"AL !" $U#-

 A-A %US,S A!-

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H%$""#!AL

LAF

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• Laminar air flow systems contains three

basic elements I

• a blower?

•  a hi;h efficiency air filter?

•  and a plenum.

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,%A F!L#-S

•  A highefficiencyparticulate air  

or *%A•  00.0J5 of

airborne 

particles 2.micrometers Bm in diameter

http://en.wikipedia.org/wiki/Particulatehttp://en.wiktionary.org/wiki/airbornehttp://en.wikipedia.org/wiki/Micrometrehttp://en.wikipedia.org/wiki/Micrometrehttp://en.wiktionary.org/wiki/airbornehttp://en.wikipedia.org/wiki/Particulate

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!uided Airflow 'entilation

"ystem 

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 ADA"#A)S

• #his novel desi;n maintains a lar;e sterile :one at a much lower operatin; cost ascompared to other conventional ventilation systems and minimi:es infection rate inthe $-.

• %rovides a directional? stable and sterile airflow Bvertical? hori:ontal and dia;onal tocreate a clearly defined sterile :one for the sur;ery and instrument tray areas.

•  Accommodates between / I 74 air chan;es per hour  B72 air chan;es is commonlyused.

• Double8wall e6haust system located at low level helps to reduce turbulences by;uidin; contaminated air out of $- while enhancin; the coolin; effect within $- inhot climate.

•  Allows fle6ibility of optimal patient positionin; for different operatin; postures? whichoptimi:es e>uipment placement and staff er;onomics.

• -e>uires a lower airflow rate? /922 mCh? to achieve stable and sterile environment incomparison with other conventional laminar airflow BLAF systems re>uirin; 0222

mCh.• Maintains a constant bacteria count of 2.4 cfuCm? which is effective in infectioncontrol? Bmeasured at a distance of 22 mm from wound site? independent ofpersonnel activities over lar;e wor@in; area in the $-.

• 125 8 J25 reduction in ener;y

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• &,A-"L

S#UD!S

• S&A"D!"A!A"

=UK S#UD!S

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