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Invacare Force-2 User Manual Invacare

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One of the most difficult tasks facing aging manual wheelchair users is the difficulty engaging or keeping engaged the wheel locks on their wheelchairs. Having a stable, non moving, wheelchair during the transfer process is of the utmost importance to all wheelchair users. The UpStop Wheelchair Braking System is designed to reduce the occurrence of falls among manual wheelchair users when they are transferring to and from their wheelchair.


Upon receiving a patented prototype from an inventor, our Initial scope of this project included performing a preliminary market assessment including conducting a consumer panel to verify the need for the device; a preliminary business assessment including searching for competing products and technologies; an initial technical assessment of the inventors prototype; and lastly planning on how to assist in its commercialization. Through Alpha or concept generation focus groups, consumers identified the functions and features of an ideal manual wheelchair braking system. These features were used to create the Beta prototype which was then tested by wheelchair users. Therefore a complete redesign of the inventors prototype was performed prior to introducing the prototype to potential licensing entities.



Invacare Force-2 User Manual Invacare

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Whole-body shocks and vibrations experienced during manualwheelchair use can decrease an individual's comfort, increase the rateof fatigue, result in injury, and consequently limit mobility and communityparticipation. We used a wheelchair-vibration simulator to examine whetherthe seat reaction forces experienced by wheelchair users were differentiallyinfluenced by wheelchair suspension, trunk-muscle innervations, and groundspeed. We used wheelchairs instrumented with load cells and accelerometers todetermine the forces transmitted from the seat frame and the headaccelerations experienced by riders. We determined that self-selected speed,seat force, and head accelerations differed between subjects with and withouttrunk-muscle innervations and between rigid and suspension wheelchairs. Seatforce and head accelerations were greatest in the rigid-frame wheelchair andlowest in the spring-type suspension-frame wheelchairs. Those participantswithout trunk-muscle innervations preferred slower speeds than those withtrunk-muscle innervations. Forward head accelerations were greater in thosewithout than with trunk-muscle innervations. Wheelchair rear-suspensionsystems may improve wheelchair mobility function in terms of comfort athigher velocity by minimizing the seat forces and head accelerationsexperienced by the riders, especially those with higher level spinal cordinjury and diminished postural control.


Ten males who had complete SCI (American Spinal Injury AssociationA or B) and were full-time manual wheelchair users were asked to volunteer.The volunteers were classified into two functional categories: High SCI (n =5) and Low SCI (n = 5). The High SCI group (weight range: 138-176 lb [63-80kg]) were those with an SCI lesion at or above the fourth thoracic level. TheLow SCI group (weight range: 161-250 lb [73-113 kg]) were those with an SCIlesion at or below the twelfth thoracic level. The primary difference betweenthese two functional categories is the level of trunk control. Those withHigh SCI have no trunk control, while those with Low SCI have nearly intacttrunk strength with innervated abdominals and thoracic extensors but notlumbar extensors. The volunteers were recruited from the outpatient servicesat Rancho Los Amigos National Rehabilitation Center in Downey, California.Before data collection, we asked the volunteers to read and sign an informedconsent form that had been approved by the Rancho Los Amigos InstitutionalReview Board. We performed all testing at the Rehabilitation EngineeringDepartment located at Rancho Los Amigos National Rehabilitation Center.


Wheelchair suspension reduced the force and accelerationsexperienced by manual wheelchair users and may improve the function of manualwheelchair users in terms of comfort at higher speeds, especially for userswithout trunk-muscle innervations. We determined that vibration exposure maydepend on suspension configuration, trunk-muscle innervations, and speed andthat minimizing the forces transmitted to the rider is important for ridequality. However, further research is needed for a full understanding of therelationships among shocks and vibrations, comfort level, and onset ofinjury.


[5.] Cooper RA, Wolf E, Fitzgerald SG, Kelleher A, Ammer W,Boninger ML, Cooper R. Evaluation of selected sidewalk pavement surfaces forvibration experienced by users of manual and powered wheelchairs. J SpinalCord Med. 2004; 27(5):468-75. [PMID: 15648802]

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Invacare Force-2 User Manual Invacare Blenda Loveless <blendaloveless@gmail.com> - 2023-12-21 04:34 -0800

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