1. Today's meeting
2. What we know about the electrical system and what we don't know
3. This week's assignments
4. Next week's meeting
5. M-HEAL Design Weekend (Feb. 6th and 7th)
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1. Today's Meeting:
Today we did a rough paper design of the gamma prototype. We decided to go with a mechanism similar to the first joint on the beta prototype, except using a bike wheel instead of the shower drain (and now the peg goes into the wheel radially from the rim instead of through the edge). We also decided to go with a simple cross design for the base, forgoing the golf push cart design brought up last week (due to its complexity and non-mission-critical advantages). Mike will be posting drawings of what we discussed, so don't worry if you can't picture it from my (poor) description. We also discussed what we need to figure out to get the specs for the electrical system. What we discussed is in the next section.
2. What we know about the electrical system and what we don't know
Here are questions that need answering:
What surgeries do we want this to be used for and how long do they take?
Are we targeting places that only need a lamp during blackouts or places that don't have lamps?
How do handcrank charging systems work (specifically)?
How long would it take to charge up the battery with a handcrank? How long hooked up to a bike?
How can one prevent equipment damage from power surges from the grid?
Do we need to charge from the wall?
Should we incorporate solar cells?
What is our target price?
What is our target brightness?
(Let me know if there are any questions brought up today that I forgot to list)
What we do know (relevant to the questions above):
Something similar to our alpha prototype was built in Fort Portal, Uganda for ~$40
FDA spec for a minor surgical lamp is 850 lumens for a 6" spot at 36"
Our current lamp is 810 lumens and has about a 6" spot at 36"
Our current lamp uses 26 W at 3.5 V
We decided that ideally the lamp would work just off the handcrank (assuming we can get reasonable crank times)
3. This week's assignments
Mike H: Post drawings of current gamma prototype design, give me Kelly's email address (assuming she wants on the email list)
Mike W: Talk to AAPD and East Quad Bike Coop (http://www.eqbc.org/) about getting bikes (talk to Carl to figure out best method to procure bikes)
Carl: Look for bikes on Craigslist (talk with Mike W to figure out best method to procure bikes)
Patrick: Learn how handcrank generators work, talk to girlfriend about preventing power surges
Elliot: Look through Abigail's website (http://empowerdesign.org/) and thesis (http://deepblue.lib.umich.edu/handle/2027.42/63801) for info on handcranks
Selvan: Get back to me about the penta-chart, do a quick write up on the tiers of Uganda's healthcare system and anything else you've looked into this past week
Naroo: Get back to me about the penta-chart
Phil, Mustafa: Get info on what surgeries are done and how long they take
Anita, Brian, Geeti: Let me know if you still want to be involved in the project
Steve: Talk to ATC about using their LEDs
Post what you have on the blog by Friday. If you're having a hard time with what you're supposed to do email me by Thursday and post something on the blog, so we can figure out how to collectively help you get it done.
4. Next week's meeting
Next week plan on meeting at 8pm on Sunday in the LBME project room once again. The meeting will be focused on big picture stuff so we can develop some good specs to design the electrical portion of the lamp.
5. M-HEAL Design Weekend
Feb. 6th and 7th is M-HEAL Design Weekend. We'll be working on the lamp from ~11am Saturday until ~6pm on Sunday (don't worry, you get to go home to sleep). Try to clear your schedule so you can be there.
As always, let me know if you have any concerns, questions, problems, or ideas.
Keep up the good work!
Steve
Mike H: Post drawings of current gamma prototype design, give me Kelly's email address (assuming she wants on the email list)
Mike W: Talk to AAPD and East Quad Bike Coop (http://www.eqbc.org/) about getting bikes (talk to Carl to figure out best method to procure bikes)
Carl: Look for bikes on Craigslist (talk with Mike W to figure out best method to procure bikes)
Patrick: Learn how handcrank generators work, talk to girlfriend about preventing power surges
Elliot: Look through Abigail's website (http://empowerdesign.org/) and thesis (http://deepblue.lib.umich.edu/handle/2027.42/63801) for info on handcranks
Selvan: Get back to me about the penta-chart, do a quick write up on the tiers of Uganda's healthcare system and anything else you've looked into this past week
Naroo: Get back to me about the penta-chart
Phil, Mustafa: Get info on what surgeries are done and how long they take
Anita, Brian, Geeti: Let me know if you still want to be involved in the project
Steve: Talk to ATC about using their LEDs
Post what you have on the blog by Friday. If you're having a hard time with what you're supposed to do email me by Thursday and post something on the blog, so we can figure out how to collectively help you get it done.
4. Next week's meeting
Next week plan on meeting at 8pm on Sunday in the LBME project room once again. The meeting will be focused on big picture stuff so we can develop some good specs to design the electrical portion of the lamp.
5. M-HEAL Design Weekend
Feb. 6th and 7th is M-HEAL Design Weekend. We'll be working on the lamp from ~11am Saturday until ~6pm on Sunday (don't worry, you get to go home to sleep). Try to clear your schedule so you can be there.
As always, let me know if you have any concerns, questions, problems, or ideas.
Keep up the good work!
Steve
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