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Thread: Invacare TDX SR w/ Motion Concepts UltraLow System, Vent Tray & Sip-N-Puff Head Array

  1. #1

    Invacare TDX SR w/ Motion Concepts UltraLow System, Vent Tray & Sip-N-Puff Head Array

    Who says CareCure is only a good site to learn about manual wheelchairs?

    This is probably the most-complex powerchair I have ever done. It was configured for the needs of a veteran with high quadriplegia who was ventilator dependent, had no movement in his extremities, and had only limited ability to turn his head.

    I started with an Invacare TDX SR powerbase equipped with a 3 22NF battery tray (the extra battery powers the vent). The TDX base was shipped to Motion Concepts for installation of an 18x19 UltraLow power seating system with the following features:

    - 55 degrees tilt
    - 174 degrees power recline
    - Pivot Plus power elevating legrests
    - Articulating Compact Vent Tray
    - 18.5" Seat-To-Floor
    - 18"H MaTRx Contour Back
    - Ergonomic Arm Troughs with Multiaxis Mounting Hardware
    - Swingaway Lateral Thigh Supports

    - Stealth TWB Lateral Supports

    Here is the chair when it arrived.

    My initial objectives were to clean up the wiring, relocate the attendant control, install the alternative driving system, and make space for the vent "circuit" (tubing).

    The chair is operated using an ASL109 Stealth Ultra Sip-N-Puff Head Array. With this system, the sip-n-puff straw is used to drive the chair forward or backward and proximity switches embedded in the lateral headrest pads are used to turn the chair left and right. The sip-n-puff mount was custom fabricated out of Loc-Line modular hose and relocated from the headrest to the backrest to allow the headrest to be removed and the sip-n-puff system swung out of the way for transfers.

    To switch between driving profiles, access the power seating, or operate the infrared/mouse emulation features I fabricated a "double lip" switch using two roller lever switches to replace the single push button "lip switch" that ASL provides with the system.

    I ordered the chair with Stealth's TWB laterals, but I have not had good success using them to achieve stable positioning without excess pressure. I ended up replacing them with fixed offset laterals from a MaTRx PB Elite back. Believe it or not, they could be bolted on using existing holes.

    To keep the his arms from coming out of the arm troughs when tilting, I modified the Motion Concepts Ergonomic Arm Troughs with custom elbow stops made from aluminum strapping, ABS plastic and Roho Adaptor cells. They mount in the channels underneath the arm trough and will not interfere with flipping the armrests back. I don't understand why Motion Concepts or Otto Bock haven't came out with something similar themselves since it solves a common problem, is simple, and seems to be such an obvious solution.

    I was pleased with how cleanly I was able re-reroute the electronics harnesses, but I didn't realize I would face almost as difficult a challenge routing the vent circuit. The amount of tubing is excessively long for a powerchair and can not be trimmed to length. I was especially concerned about it getting snagged on something in the surrounding environment or getting crushed in the power seating system. I fabricated the following system of hooks...

    While I wish they made a shorter circuit with black tubing, but here is the end result...

    These chairs take a lot of work, but it is rewarding when the end user is able to use it successfully and you know your efforts played a major role.
    Last edited by SCI_OTR; 11-06-2009 at 08:07 AM.

  2. #2
    Senior Member
    Join Date
    Aug 2006
    Spring Hill , Florida
    Wow SCI OTR,
    That is quite the chair. I salute you for doing such an outstanding job equipping this chair to the MAX for a fellow Veteran. I use to have a vent tray on the back of my old INVACARE Action Arrow Storm power wheelchair.It stuck out in the back aways & I was always backing into things w/the vent tray. It almost doesn't look like the original chair after you doing your magic. It is a job well done & you should be proud of your accomplishment. Hope it serves my fellow Veteran well & hope he/she will be real comfortable in it.

  3. #3
    Senior Member
    Join Date
    Aug 2007
    last house on the left
    Another WOW from me too. Amazing chair, and you really, really know your stuff.

  4. #4
    Very interesting read/look see! It's so obvious you enjoy doing your best for your patients/clients. They are fortunate. Thanks for sharing.

  5. #5
    Senior Member DaleB's Avatar
    Join Date
    Sep 2006
    Tidewater, VA
    Wowzer. I've said it before and I'm gonna say it again: You have a super cool job!

    He who hears not me but the Logos will say: All is one.

  6. #6
    Senior Member MarkPals's Avatar
    Join Date
    Jan 2007
    Butte, Montana
    That is a beautiful chair. It brings tears to my eyes. Can you tell me about what one like that would cost? You really thought of everything. Thank God for people like you.
    Veni.Vidi,Velcro...I came, I saw, I stuck around.

    Vidi, Vici, et Veni, et Veni, et Veni...

  7. #7
    Quote Originally Posted by MarkPals View Post
    Can you tell me about what one like that would cost?
    I was intrigued by this question myself. As best as I can tell, the total MSRP would come in somewhere between $36-37,000 based on the order forms. The VA is the largest purchaser of wheelchairs in the world, so the actual cost to the taxpayer is much less because of "trade discounts".

    Oh, and throw in another $50 or so if you include the Loc-Line and other materials used to fabricate custom items such as the sip-n-puff mount, double lip switch, elbow stops, and system for routing the vent circuit.

    Isn't it amazing what can be done with a little thought and a few inexpensive items from Lowes, Home Depot and RadioShack?

    Thanks to all for the compliments. It can be a lot of work, but most days it is a pretty cool job.

  8. #8
    Senior Member canuck's Avatar
    Join Date
    Mar 2003
    BC Canada
    How long would it take to do a set up like that?

  9. #9
    25-30 hours (not all of which were on the clock). It would probably take about 10 hours to duplicate it.

  10. #10
    Senior Member
    Join Date
    Aug 2007
    last house on the left
    Fortunately I don't need most of the stuff on that chair, but the footpedals intrigue me. I have never seen a set like that before and wish I could have gotten them on my tilt chair. I have size 9 shoes, so I always feel like my feet are at risk coming through doors because the toe part of my foot is just hanging over air.
    I hope the person who is getting this chair has many many miles of pleasure and adventure ahead. Your dedication and skills are awe inspiring!

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