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Functional analysis of a sterilizer
Renata Bertocchi
Open Source for
Biomedical Engineering - OS4BME
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
Lack of hygienic condition:
35.3 million people living with HIV/AIDS worldwide
in 2012
1.6 million people died of AIDS-related illnesses
worldwide in 2012
More than 780,000 people die every year due to
the consequences of hepatitis B
Ebola: over 4,500 deaths in ten months
WHO Data
Functional analysis of a sterilizer
Main blood diseases vectors:
Surgical tools
Dentist tools
Podiatrist tools
Functional analysis of a sterilizer
“An estimated 4,100 children under the age of five die
each day from diarrhea globally. Malnutrition, due
to dirty water, inadequate sanitation, and hygiene,
is estimated to lead to death in an additional 2,350
children under the age of five each day.”
WHO data
Functional analysis of a sterilizer
Water crisis caused by:
Climate change
World population growth
Bad management
Functional analysis of a sterilizer
Water crisis (2008)
Functional analysis of a sterilizer
Water crisis (2025)
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
UV radiation
Functional analysis of a sterilizer
UV radiation: brief history
All started in 1672 with Isaac Newton’s decomposition of light
Functional analysis of a sterilizer
UV radiation: brief history
Functional analysis of a sterilizer
UV radiation: brief history
Functional analysis of a sterilizer
UV radiation
Functional analysis of a sterilizer
UV radiation inactivation
Functional analysis of a sterilizer
UVC uses
Air sterilization (typically in cellular culture
systems)
Water sterilization (aquriums and bioreactors)
Surface sterilization (surgical rooms, surgical tools)
Functional analysis of a sterilizer
UVC uses
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
UVC material interaction
Absorption can cause an increase of temperature which
can damage material like polymers.
Functional analysis of a sterilizer
UVC material interaction
Polymers tend to
lose their properties
because the
presence of
impurities causes
photodegradation.
Functional analysis of a sterilizer
UVC material interaction
Even if penetration is very
negligible (75 µm), UV
irradiation can degrade
wood surfaces more than
visible light.
Material containing
cellulose is generally
bleached
Functional analysis of a sterilizer
UVC material interaction
Glass has nearly zero
transmission level
Glass solarization
Textiles generally
lose their colours
exciting cromophores
Functional analysis of a sterilizer
UVC material interaction
Transparent material to UVC are mainly soft glass
(Sodium-Barium), quartz glass, Teflon
Metal are generally UV stable, some of them have
good reflective coefficient (Aluminium)
Functional analysis of a sterilizer
Material choice and dimensioning
Aluminium Dimensions
- ρ = 70-80% - lamp size
- low cost - surgical tools
dimensions
- low weight
Functional analysis of a sterilizer
Material choice and dimensioning
Aluminium
1) 2) 3)
- cheap - less processing - ready-to-use
- need of processing - round angles - round angles
- big quantities - big quantities - expensive
Functional analysis of a sterilizer
Dimensioning: 3D-modelling
Functional analysis of a sterilizer
blue print
Functional analysis of a sterilizer
3D printed parts
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
UVC LED
- power output
- shape
- viewing angle
- cost
Functional analysis of a sterilizer
The lamp
- size
- power
- shape
- useful life
Functional analysis of a sterilizer
Modelling the system
k = 2*10-4
m2
/J
Functional analysis of a sterilizer
Modelling the system
Functional analysis of a sterilizer
Modelling the system
Aluminium ρ = 70-
80%
Functional analysis of a sterilizer
Modelling the system
µController
Functional analysis of a sterilizer
Modelling the system
Arduino is
Open-source
Easy to use
Low cost
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
Projecting an UVC Sterilizer:
Analysis of real needs
Analysis of physical principles
The Project
Mechanics
Electronics
Software
Functional analysis of a sterilizer
Modelling the system
Arduino (www.arduino.cc) uses
a simple Integrated Development
Environment (IDE) allowing all
kinds of users to write programs
using a language similar to C/C++.
Functional analysis of a sterilizer
Modelling the system
Functional analysis of a sterilizer
Finally...
We have a surface sterilization system safe and low-
cost, capable of sterilize surgical tools in 1 h (30 min
per part).
Sterilization: regulations &
standards
Case of study: UVC sterilizer
UVC is an emerging method of sterilization and
there is not a precise regulation to observe. This
implies more caution and a long research for articles
and footprints of who has already work on it.
Sterilization: regulations &
standards
About sterilization of health care products...
Over 60 ISO rules!!!
Sterilization: regulations &
standards
Case of study: UVC sterilizer
Radiation
Sterilization: regulations &
standards
Case of study: UVC sterilizer – gluing the pieces...
Choosing is fundamental
- to save time in consulting
- ISO rules are not free...
Functional analysis of a sterilizer
About water sterilization
Functional analysis of a sterilizer
About water sterilization
“At sufficiently high doses, all waterborne enteric
pathogens are inactivated by UV radiation.” WHO
Functional analysis of a sterilizer
About water sterilization
Problems:
- filtration
- flux
- UVC interaction with glass
Functional analysis of a sterilizer
References:
1. Many data from www.who.inc
2. Scientific America, some articles about water crisis
3. Ultraviolet Germicidal Irradiation Handbook - UVGI
for Air and Surface Disinfection. Kowalski,
Wladyslaw
4. www.arduino.cc
5. www.wikipedia.org
6. Philips lamp catalogue and Omron µSwitch catalogue
Functional analysis of a sterilizer
Thank you for yourThank you for your
attention!attention!

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2014 12-22 - functional analysis of a sterilizer (rb)

  • 1. Functional analysis of a sterilizer Renata Bertocchi Open Source for Biomedical Engineering - OS4BME
  • 2. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 3. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 4. Functional analysis of a sterilizer Lack of hygienic condition: 35.3 million people living with HIV/AIDS worldwide in 2012 1.6 million people died of AIDS-related illnesses worldwide in 2012 More than 780,000 people die every year due to the consequences of hepatitis B Ebola: over 4,500 deaths in ten months WHO Data
  • 5. Functional analysis of a sterilizer Main blood diseases vectors: Surgical tools Dentist tools Podiatrist tools
  • 6. Functional analysis of a sterilizer “An estimated 4,100 children under the age of five die each day from diarrhea globally. Malnutrition, due to dirty water, inadequate sanitation, and hygiene, is estimated to lead to death in an additional 2,350 children under the age of five each day.” WHO data
  • 7. Functional analysis of a sterilizer Water crisis caused by: Climate change World population growth Bad management
  • 8. Functional analysis of a sterilizer Water crisis (2008)
  • 9. Functional analysis of a sterilizer Water crisis (2025)
  • 10. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 11. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 12. Functional analysis of a sterilizer UV radiation
  • 13. Functional analysis of a sterilizer UV radiation: brief history All started in 1672 with Isaac Newton’s decomposition of light
  • 14. Functional analysis of a sterilizer UV radiation: brief history
  • 15. Functional analysis of a sterilizer UV radiation: brief history
  • 16. Functional analysis of a sterilizer UV radiation
  • 17. Functional analysis of a sterilizer UV radiation inactivation
  • 18. Functional analysis of a sterilizer UVC uses Air sterilization (typically in cellular culture systems) Water sterilization (aquriums and bioreactors) Surface sterilization (surgical rooms, surgical tools)
  • 19. Functional analysis of a sterilizer UVC uses
  • 20. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 21. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 22. Functional analysis of a sterilizer UVC material interaction Absorption can cause an increase of temperature which can damage material like polymers.
  • 23. Functional analysis of a sterilizer UVC material interaction Polymers tend to lose their properties because the presence of impurities causes photodegradation.
  • 24. Functional analysis of a sterilizer UVC material interaction Even if penetration is very negligible (75 µm), UV irradiation can degrade wood surfaces more than visible light. Material containing cellulose is generally bleached
  • 25. Functional analysis of a sterilizer UVC material interaction Glass has nearly zero transmission level Glass solarization Textiles generally lose their colours exciting cromophores
  • 26. Functional analysis of a sterilizer UVC material interaction Transparent material to UVC are mainly soft glass (Sodium-Barium), quartz glass, Teflon Metal are generally UV stable, some of them have good reflective coefficient (Aluminium)
  • 27. Functional analysis of a sterilizer Material choice and dimensioning Aluminium Dimensions - ρ = 70-80% - lamp size - low cost - surgical tools dimensions - low weight
  • 28. Functional analysis of a sterilizer Material choice and dimensioning Aluminium 1) 2) 3) - cheap - less processing - ready-to-use - need of processing - round angles - round angles - big quantities - big quantities - expensive
  • 29. Functional analysis of a sterilizer Dimensioning: 3D-modelling
  • 30. Functional analysis of a sterilizer blue print
  • 31. Functional analysis of a sterilizer 3D printed parts
  • 32. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 33. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 34. Functional analysis of a sterilizer UVC LED - power output - shape - viewing angle - cost
  • 35. Functional analysis of a sterilizer The lamp - size - power - shape - useful life
  • 36. Functional analysis of a sterilizer Modelling the system k = 2*10-4 m2 /J
  • 37. Functional analysis of a sterilizer Modelling the system
  • 38. Functional analysis of a sterilizer Modelling the system Aluminium ρ = 70- 80%
  • 39. Functional analysis of a sterilizer Modelling the system µController
  • 40. Functional analysis of a sterilizer Modelling the system Arduino is Open-source Easy to use Low cost
  • 41. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 42. Functional analysis of a sterilizer Projecting an UVC Sterilizer: Analysis of real needs Analysis of physical principles The Project Mechanics Electronics Software
  • 43. Functional analysis of a sterilizer Modelling the system Arduino (www.arduino.cc) uses a simple Integrated Development Environment (IDE) allowing all kinds of users to write programs using a language similar to C/C++.
  • 44. Functional analysis of a sterilizer Modelling the system
  • 45. Functional analysis of a sterilizer Finally... We have a surface sterilization system safe and low- cost, capable of sterilize surgical tools in 1 h (30 min per part).
  • 46. Sterilization: regulations & standards Case of study: UVC sterilizer UVC is an emerging method of sterilization and there is not a precise regulation to observe. This implies more caution and a long research for articles and footprints of who has already work on it.
  • 47. Sterilization: regulations & standards About sterilization of health care products... Over 60 ISO rules!!!
  • 48. Sterilization: regulations & standards Case of study: UVC sterilizer Radiation
  • 49. Sterilization: regulations & standards Case of study: UVC sterilizer – gluing the pieces... Choosing is fundamental - to save time in consulting - ISO rules are not free...
  • 50. Functional analysis of a sterilizer About water sterilization
  • 51. Functional analysis of a sterilizer About water sterilization “At sufficiently high doses, all waterborne enteric pathogens are inactivated by UV radiation.” WHO
  • 52. Functional analysis of a sterilizer About water sterilization Problems: - filtration - flux - UVC interaction with glass
  • 53. Functional analysis of a sterilizer References: 1. Many data from www.who.inc 2. Scientific America, some articles about water crisis 3. Ultraviolet Germicidal Irradiation Handbook - UVGI for Air and Surface Disinfection. Kowalski, Wladyslaw 4. www.arduino.cc 5. www.wikipedia.org 6. Philips lamp catalogue and Omron µSwitch catalogue
  • 54. Functional analysis of a sterilizer Thank you for yourThank you for your attention!attention!