Improving the design and operation of a finger SimulatorNameMohammad N. R. KhanCourseM.Sc. in Biomedical EngineeringModule: MEC3098 Individual Project

SupervisorDr. Andrew Naylor

Outline

Objectives

BackgroundFinger Simulator

Figure 1: Finger simulator (2)

Background

Figure 2: Finger simulator (2)

ArduinoArduino is an open-source platform. Consists of,Figure 3: Arduino Uno Board [1]

8 Channel RelayA small electronic device, uses small amount of power to control much higher amount of power.

Figure 4: 8 Channel Relay Module, photo has been taken on 20th March, 2015.

Previous ExperienceDesigning a Home Automation System by using Arduino Uno Rev3 RF receivers.

Figure 5: Sample photo was taken on 22nd February, 2014, first step of the project.

Technical ProgressReview on the simulatorLiterature review on the Arduino UNO, IDE, RelayFlow ChartExplored the utilization of Arduino UNO with relay (switch)Examined some samples with similar hardware

Flow Chart

Work To Be Done

ReferencesArduino, SparkFun Electronics, copyright 2014, Last viewed: 14th July, 2015, URL: https://learn.sparkfun.com/tutorials/what-is-an-arduino.Joyce, T. J., and A. Unsworth. "The design of a finger wear simulator and preliminary results." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 214.5 (2000): 519-526.Weightman, B. and Amis, A. A. Finger joint force predictions related to design of joint replacements. J. Biomed. Engng, 1982, 4, 197210.Joyce, T. J. and Unsworth, A. Wear of cross-linked polyethylene against itself. Proc. Instn Mech. Engrs, Part H, Journal of Engineering in Medicine, 1996, 210(H1), 1115.Tamai, K., Ryu, J., An, K. N., Linscheid, R. L., Cooney,W. P. and Chao, Y. S. Three dimensional geometric analyasis of the MCP joint. J. Hand Surg., 1988, 13A, 521531.

Questions?

In the middle of the simulator, testing is carried out in/inside the bath. The test Prosthesis is mounted between two holders in the bath. One of these holders represents the metacarpal bone, which holds stationary and the other one represents the proximal phalanx which is oscillated against the action of the tendons. Both holders have shoulders, which help to fix their locations. The metacarpal bone holder is mounted into the base of a square section cantilever. Load is measured in two directions through eight strain gauges, mounted on the cantilever. The phalanger holder is held in a clamp. The holder rotates freely through the arc and stands between a stainless steel base plate and a polymeric arc piece. A moving pulley is attached to the base plate,which represents the volar plate and the metacarpal ligaments. Also, a pneumatic cylinder is mounted on the bath along a stainless steel rod, which acted as a thumb. The pneumatic cylinder provide the flexion-extension and pinch mechanisms, which are positioned above and behind the bath. Besides, pulleys guide the tendons from the bath to the pneumatic cylinders (two), which individually provides flexion and extension. These cylinders are built on an Aluminum slider and connected by a universal coupling to the large cylinder at the rear of the framework. Along that, another pneumatic cylinder is amplified as a flexor stop fork, which is appeared across the aluminum slider. Two steel rods are mounted within a pair of bushes, which allows the movement of the light aluminum slider during the activation period of the light cylinder.