Using a Lithium Ion Battery to replace NiMH For Welch Allyn Otoscope/Opthalmascope

BATTERY Welch Allyn
72300
Panasonic
NCR18650
COST $60 CDN $15 CDN
WARRANTY 2 Years 1 Year
HOURS OF USE 1 unit 5 unit
CHARGE TIME 16 hrs 4 hrs
CHEMISTRY Nickel Cadmium Lithium Ion
VOLTAGE 3.5 V 3.6 V
mAh 620 mAh 3400 mAh
LIFE SPAN 2 yrs 10+ yrs
WIDTH x HEIGHT 1″ x 2.9″ 0.73″ x 2.57″ (18.90mm x 69.41mm)
CHARGER INTERNAL EXTERNAL

Over the years our Simulation Centre had quite the challenge of ensuring that our otscope/opthalmascope handles had enough power to endure a busy week of ear/eye skills lab. Often times batteries would fail to endure a 3 hour skills session. This would draw the ire of faculty and students alike. We could have chosen to purchase more batteries or handles but we felt that having users switch battery or handle partway through their lab would be a bit of a hassle. So in the summer of 2017 I went on a quest to look for a solution. How difficult could it be!

The current battery technology used by Welch Allyn for their handles is of bygone years. Nickel Cadmium batteries haven’t been used widely in portable electronics for a couple of decades. Lithium Ion batteries are now King. The wide use of Li-Ion over the years has seen the price come down considerably. Li-Ion batteries can be found in the Tesla, portable computers and many cordless power tools. Li-Ion batteries are cheaper, have a greater energy capacity and it has up to 5 times the lifespan of NiCd. Surely there must be a Li-Ion replacement for the 72300.

Replacing the 72300 is not that easy. Substituting one battery technology for another is not as simple as finding an equivalent battery size and plugging it in. For one, NiCd batteries have a nominal rating of 1.2 volts per cell where as Li-Ion have a nominal voltage of 3.6 volts per cell and typically max out at 4.2 volts, which is well over three times the voltage of the NiCd cell. Considering the 72300 has a voltage rating of 3.5 volts, which is almost 3x that of a NiCd cell, it would appear that the 72300 is a custom cell created by Welch Allyn, composed of three cells stacked one on top of the other in series and packaged in a cylinder resembling a elongated d-cell. With only a 0.1 volt difference between the 3.6 v, single cell Li-Ion battery and the 72300 NiCd, finding a replacement was made a little easier. More than likely the format of the 72300 is not used by other manufacturers of medical assessment handles. The 72300 is a non-standard format, it was not found in the International Electrotechnical Commission (IEC) or the American National Standards Institute (ANSI) specifications.

I scoured the internet for a replacement Li-Ion battery close in size but not bigger, since it has to fit into the handle. Many of the cylindrical Li-Ion batteries came close in length but not in width. Not only was I looking for the greatest capacity for a chosen size but one that wouldn’t produce 25 Amps if a short was accidentally made during handling. Here comes protected cells to the rescue. Protected cells are Li-Ion cells that have a control circuit attached to the end of the cell. The purpose of the circuit is to protect the cell against short circuits, over charging and over discharging.

The Panasonic NCR 18650B Lithium Ion battery was chosen for the most crucial component – the protection circuity (don’t want batteries catching fire or exploding in students or professor’s faces). The circuit limits the current to 4.875 Amps which is still a bit much for my liking but compared to the alternative there is no other option. The NCR18650 is rated at 3400 mAh, which is quite impressive for it’s size. The numerals in the part number 18650, refer to the width of 18mm and length 65.0mm. There is quite a difference in the size of the 72300 and the 18650. The 18650 is smaller by 4.3mm width-wise and 6.5mm length-wise. The most concerning of the 2 numbers being the width. The last thing I want is for the battery to be moving about inside the metal handle with the potential for a short to occur.

Panasonic Li-Ion Battery NCR 18650B Datasheet

The spring inside the cap of the handle made it easy to overcome the difference in length and secure electrical contact. However, to keep the battery from moving side to side I purchase a 1″ x 2″ PVC Riser from Home Depot. The inside diameter matched the Panasonic NCR18650 perfectly. However with most mass produced products, outside of precision components, the outside diameter varied from perfect fit to snug to completely impossible. I needed a total 16 spacers, however half of them were slightly thicker than 1″, so I sanded them down with #80 grit sand paper. Each took about a half hour of hand sanding.

Battery Assembly

Battery inside PVC Riser inside handle

INACSL 2018 Group B

INACSL 2018 Group B
Kymberley Bontinen Douglas College
Gail Brown Fanshawe College
Paula Carson South Dakota State University
Robyn Curtis Chamberlain College Of Nursing
Heather DeGrande Texas A&M University – Corpus Christi
Christy Dubert Georgia Southern University
Liesbeth Ewijk-van den Bosch Erasmus MC Zorgacademie Unit IAZ
Julie Fomenko Texas A&M University – Corpus Christi
Laura Hall Ayers Saint Gross
Valerie Herbert University of Maine
Yumi Iwamoto HBG University
Rachel Kilgore UTMB
Sema Kuguoglu Istanbul Medipol University Health
Science Faculty Division Of Nursing
YuJin Lim Langara College
Nancy Maas Northern Michigan University
P. Meima-Cramer Erasmus MC Academie
Larissa Miller Lansing Community College
Judith Reeves University Of Missouri – St. Louis
Antoinette Solans Oakton Community College
Alicia Wiese Columbus Community College

INACSL 2018 Group A

INACSL 2018 Group A
First Last Company
Ute Beffert John Abbott College
Donna Boyce Elgin Community College
Kathy Buhler Fortis College
Allyson Cooper Red River College
Elizabeth Dee John Abbott College
Marcia Donley Central Community College
Melissa Ehmke UMSL-Director NLRSC
Karen Fleming North York General Hospital
Karyn German Madison College
Becky Hawarny College of Lake Country
Paula Hutchings Hill College
Tami Jones Central Community College
Svend Haakon Kristensen Laerdal Medica Japan
Justin Laferty TriStar Health
Tiffany Losekamp USAF School Of Aerospace Medicine/JYG
Rumi Maeda Tokyo Medical And Dental University
Raquel Meyer Baycrest Centre For Learning,
Research & Innovation In Long Term Care
Betsy Reeves
Patrica Richard University Of Texas Medical Branch
School Of Nursing At Galveston
Kristina Swiercz
Margot Zemrau Grant McEwan University

INACSL 2018 Agenda June 13

Time Activity Groups Presenters/Facilitators
0800 Transportation to GBC ALL INACSL
0830 Registration & Breakfast
Introduction
ALL GBC Simulation Centre Faculty and Staff
Simulation Centre, Sally Horsfall Eaton
, School Of Nursing
0845 Presentation:

Introduction to the use of
technology in nursing simulation

ALL Paula Mistrilli: RN, PhD
Chair, BScN,Bridging and Simulation Centre
Sally Horsfall Eaton School of Nursing, George Brown College

Wendy Ellis, RN, MScN, PhD(c)

Chair, Practical Nursing, Personal Support Worker, Pathway
Program, Sally Horsfall Eaton Centre School Of Nursing
Georg Brown College

9:15 Session 1

Group A
Debriefing techniques in
Virtual Simulation (presentation)

Group B
Futuristic Family-Centered Dementia
Care – An Interactive Augmented
Reality Experience (Interactive Demonstration

Group A

Group B

Presenters:

Jennifer Lapum, RN, PhD
Associate ProfessorDaphne Cockwell School Of Nursing
Ryerson University

Michelle Hughes, RN, MEd
Professor
School of Community and Health Studies
Centennial College

Oona St. Amant, RN, PhD
Assistant Professor
Daphne Cockwell School Of Nursing

Tara McCulloch, RN, MA
Professor, Simulationist
Centennial College

Presenters:

Wendy Ellis, RN, MScN, PhD(c)
Chair, Practical Nursing, Personal Support Worker, Pathway
Program

Lorraine Betts, RN, MN, CHSE
Professor & Simulation Program Coordinator
Sally Horsfall Eaton School Of Nursing
George Brown College

Jacqueline Schmid, RN, MN, CHSE
Professor & Simulationist
Sally Horsfall Eaton School Of Nursing
George Brown College

10:15 Break ALL
10:20 Session 2

Group A

Futuristic Family-Centered
Dementia Care – An Interactive Augmented Reality Experience
(Interactive Demonstration)

Group B

Creating Virtual
Gaming Simulations: A process overview
(Presentation)

Group A

Group B

Presenters: Identified Above

Presenters: Identified Above

11:20 LUNCH and LEARN

Session 3

Exploring
Uses of Technology in a State of the Art Simulation Centre

Interactive Experiences.:

Scholarship and Research in Virtual Simulation (Poster Exhibit)

Technology Human Patient Simulators (Interactive Demonstration)

Body Interact Virtual 3D Avatar Simulator
(Demos)

Mannequin Moulage Appliques created by the GBC Simulation
Centre (Showcase)

ALL Pre-Preconference Tour Presenters:

Collaborative Faculty Researchers, Ryerson University,
Centennial College and George Brown College

Michael Eliadis MPM(cert), MEd(c), PMP
Manager, Simulation Centre

Howard Harris,
Simulation Technologist,
Simulation Centre

Barry Robinson, CD, BTech
Simulation Technologist
Simulation Centre

Sally Horsfall Eaton, School of Nursing
George Brown Colleg

12:35 Session 4

Group A
Creating Virtual Gaming
Simulations: A process overview(Presentation)

Group B
Can Virtual Gaming Simulation (VGS)
replace high-fidelity laboratory
simulations or clinical experiences? (Panel Discussion)

Group A

Group B

Presenters:

Paula Mastrilli, RN, PhD
Chair BScN, Bridging and Simulation Centre
Sally Horsfall Eaton School of Nursing
George Brown College

Marg Verkuyl, RN, MN, NP, PHC
Professor
School of Community and Health Studies

Centennial College

Presenters:Suba Sivaramalingam, RN, MSc
Professor & Simulationist
Sally Horsfall Eaton School of Nursing
George Brown College

Daria Romaniuk, RN, PhD
Associate Professor
Daphne Cockwell School of Nursing
Ryerson University

Marian Luctkar-Flude, RN, PhD
Assistant Professor
School of Nursing
Queen’s University

Jane Tyerman, RN, MSc, PhD
Professor
Trent/Fleming School of Nursing
Raquel Meyer
RN, PhD
Manager, Centre for Learning, Research & Innovation
Baycrest Hospital

1335 Session 5

Group B

Debriefing Techniques in Virtual Simulation
(Presentation)

Group A

Can Virtual Gaming Simulation (VGS)
replace high-fidelity laboratory simulations or clinical experiences?
(Panel Discussion)

Group B

Group A

Presenters: Identified Above

Presenters: Identified Above

1435 End Of Day Summary ALL Paula Mastrilli,RN, PhD
Chair BScN, Bridging and Simulation Centre
Sally Horsfall Eaton School of NursingGeorge Brown College

Wendy Ellis,
RN MScN, PhD(c) Chair, Practical Nursing, Personal
Support Worker & Pathway Program
Sally Horsfall Eaton School of Nursing
George Brown College

Michael Eliadis MPM(cert), MEd(c), PMP
Manager, Simulation Centre
Sally Horsfall Eaton, School of Nursing
George Brown College

1445 Return Transportation ALL INASCL