FINGER 2.0 Thumb Rehabilitation Mechanical Design

The goal of the project is to complete and refine the mechanical design of the added 5-bar thumb module system to allow the new FINGER 2.0 rehabilitation robot to be used for both left handed and right handed finger dexterity and movement for post stroke victims.

=Problem Definition= Mitigate the joint slop and looseness to allow the FINGER 2.0 to be as effective as possible in making accurate movement assists to help regain finger dexterity.

Design a new baseplate and left sided thumb module to allow FINGER 2.0 to be used for both left and right hand impaired stroke victim rehabilitation.

Check final form, fit, and function of FINGER 2.0 to ensure comfortability and ease of use for both rehabilitation patients, as well as medical professionals who will be operating the robot.

Background
Over 800,000 people suffer from a stroke in the United States every year alone. Of the survivors, over 2/3 experience long-term impairment of the affected upper-extremity. The use of robotic rehabilitation can automate the repetitive and difficult process of conventional physical therapy that comes after a patient has experienced a stroke. Robotic therapy can also serve as a scientific instrument for quantifying the recovery process and provide insight that is often unavailable with conventional physical therapy.

The original FINGER 1.0 sought to maximize controller fidelity and minimize mechanical impedance. It did so by having only one degree-of-freedom, high controller fidelity, and low friction joints and bearings. It only assisted with middle and pointer finger rehabilitation by utilizing a 8-bar mechanism and having the user make a common grasping motion. FIGNER 1.0 controlled the orientation and position of the middle phalanx of each finger.

FINGER 2.0 was designed before being assigned to our group. It differs from FINGER 1.0 because it also incorporates the thumb in the rehabilitation process. It consists of a spherical 5-bar mechanism that translates a normally 2 dimensional path to 3 dimensional space. The thumb module has 5 links, all attached at both ends to other links. Two actuators allow the system to take input from the user and manipulate that data into a position to help the patient regain their finger dexterity and natural grasping movements. The original mechanism is very well designed, but has some issues that our team has been tasked with redesigning.

Deliverables
For this project, our deliverables will be two prototypes of the FINGER 2.0 robot. Pre-existing geometry and structure were provided at the start of the project. The goal of prototypes one and two are to increase the overall rigidity and precision of the mechanism. Both prototypes will be capable of operation by both right and left-handed users.

Prototype one will focus on the joints between links to simultaneously reduce tolerance and friction. This will be done by combining machined connections with 3D printed links to create precise geometry. Prototype two will focus on the links themselves to reduce the flex of individual members in the system. This will be done by combining different materials, print in-fills, and link geometries to minimize the flex of the links while operated.

Specifications
=Design Considerations=

=Project Learning=

=Final Design=

=Validation=

=Team Members=

=Additional Documentation=

Project Schedule



Meeting Minutes

Presentations



Client Interview