Research Papers

Skin Modeling Analysis of a Force Sensing Instrument-Assisted Soft Tissue Manipulation Device

[+] Author and Article Information
Ahmed M. Alotaibi

School of Mechanical Engineering,
Purdue University,
West Lafayette, IN 47907
e-mail: alotaib3@purdue.edu

Sohel Anwar

Department of Mechanical and Energy
Indianapolis, IN 46202
e-mail: soanwar@iupui.edu

M. Terry Loghmani

School of Health and Rehabilitation Sciences,
Indianapolis, IN 46202
e-mail: mloghman@iu.edu

1Corresponding author.

Manuscript received November 26, 2017; final manuscript received March 9, 2018; published online April 26, 2018. Assoc. Editor: Ning An.

ASME J of Medical Diagnostics 1(3), 031002 (Apr 26, 2018) (11 pages) Paper No: JESMDT-17-2052; doi: 10.1115/1.4039661 History: Received November 26, 2017; Revised March 09, 2018

Instrument-assisted soft tissue manipulation (IASTM) is a form of manual therapy which is performed with rigid cast tools. The applied force during the IASTM process has not been quantified or regulated. Nor have the angle of treatment and strokes frequency been quantified which contribute to the overall recovery process. This paper presents a skin modeling analysis used in the design of a novel mechatronic device that measures force in an IASTM application with localized pressures, similar to traditional, nonmechatronic IASTM devices that are frequently used to treat soft tissue dysfunctions. Thus, quantifiable soft tissue manipulation (QSTM) represents an advancement in IASTM. The innovative mechatronic QSTM device is based on one-dimensional (1D) compression load cells, where only four compression force sensors are needed to quantify all force components in three-dimensional (3D) space. Here, such a novel QSTM mechatronics device is simulated, analyzed, and investigated using finite element analysis (FEA). A simplified human arm was modeled to investigate the relationship between the measured component forces, the applied force, and the stress and strain distribution on the skin surface to validate the capability of the QSTM instrument. The results show that the QSTM instrument as designed is able to correlate the measured force components to the applied tool-tip force in a straight movement on the skin model.

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Fig. 2

The compression load cell (FC-08TM) [28]

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Fig. 3

CAD model of the QSTM device

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Fig. 4

(a) Sensor placements in the front cavity of the QSTM device and (b) the force sensor placement inside the device measurement cavity

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Fig. 5

Full sectional view of the QSTM device

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Fig. 6

(a) Human arm model in ANSYS and (b) skin arm meshing

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Fig. 7

(a) Quantifiable soft tissue manipulation device model in ANSYS and (b) the four load cells embedded into the front cavity of the QSTM device

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Fig. 8

(a) Meshed QSTM device and (b) meshed load cells in ANSYS

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Fig. 9

Device tail and tip for bonded connections

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Fig. 10

Device tip and skin bonded contact areas in ANSYS

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Fig. 11

The QSTM device movement constraint area in ANSYS

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Fig. 12

(a) Pencil grip of QSTM device and (b) back cover grip of QSTM device

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Fig. 13

(a) The QSTM device acceleration direction in ANSYS and (b) device displacement constraint areas in ANSYS

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Fig. 14

Bonded connection results: (a) hand pressure versus skin's equivalent stress during 12 s finite element analysis (FEA) simulation and (b) skin's maximum equivalent stress at max hand force of 120 N in ANSYS

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Fig. 15

Bonded connection results: (a) skin's maximum principal stress versus applied hand force and (b) maximum principal stress's maximum value of at hand force of 120 N in ANSYS

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Fig. 16

Bonded connection results: (a) skin total deformation versus applied hand force and (b) skin's maximum deformation (9.2811 mm) where applied force 120 N in ANSYS

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Fig. 17

Bonded connection results: maximum (a) and minimum (b) four force sensors' stress measurement versus hand force

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Fig. 18

Frictional connection results: (a) hand force versus skin's equivalent stress during 6.25 s and (b) the greatest maximum equivalent stress at hand force of 0.20 MPa in ANSYS

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Fig. 19

Frictional connection results: (a) skin's maximum principal stress versus hand pressure during 6.25 s and (b) the maxima of the maximum principal stress at hand force of 0.25 MPa (frictional connection) in ANSYS

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Fig. 20

Frictional connection results: (a) skin model deformation under hand pressure during 6.25 s and (b) skin maximum deformation (4.0012 mm) at hand force of 0.25 MPa in ANSYS

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Fig. 21

Frictional connection results: maximum (a) and minimum (b) four force sensors' stress distribution versus hand pressure during 6.25 s




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