Normal force gradient/shear force sensors and method of measuring internal biological tissue stress

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7201063
APP PUB NO 20050241409A1
SERIAL NO

10836495

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A normal force gradient/shear force sensor device and measurement method for measuring internal stresses in tissues of a person supported by a chair or bed includes a planar matrix array of peripheral normal force sensors radially spaced from central shear force sensors, comprising an electrically conductive disk located within a circular opening bordered by circumferentially spaced apart electrodes. The disk and electrodes are located between upper and lower cover sheets made of a stretchable material such as polyurethane; one cover sheet is adhered to the disk and the other sheet is adhered to a support sheet for the electrodes. Motion between the cover sheets in response to shear forces exerted on the array causes the disk to press more or less tightly against the electrodes varying electrical conductance between the disk and electrodes proportionally to the magnitude and direction of the shear force. Each normal force sensor includes an electrically conductive film pressed between row and column conductors. Measurements of conductance values of pairs of sensor, which vary proportionally to normal forces exerted on the sensor, are used to calculate a gradient vector of normal forces exerted by a body part on the sensor array, which is combined with the shear force vectors in an algorithm to calculate internal reaction shear forces, e.g., on flesh near a bony prominence.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
VISTA MEDICAL, LTD.WINNIPEG MANITOBA, CA3

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Taylor, Geoffrey L Winnipeg, Manitoba, CA 24 710

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (2)
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* 6216545 Piezoresistive foot pressure measurement 63 1995
 
VISTA MEDICAL, LTD. (2)
* 6155120 Piezoresistive foot pressure measurement method and apparatus 60 1998
* 6543299 Pressure measurement sensor with piezoresistive thread lattice 42 2001
 
KEY SAFETY SYSTEMS, INC. (1)
* 5606136 Electrical lead crossover, sensing cell with electrical lead crossover, and method for making same 7 1995
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
STRYKER CORPORATION (1)
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SEIKO EPSON CORPORATION (4)
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KCI LICENSING, INC. (25)
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* Cited By Examiner

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