Capacitive extensometer particularly suited for measuring in vivo bone strain
First Claim
Patent Images
1. A capacitive extensometer adapted to be inserted into the bone of a mammal system for sensing the in vivo strain of said bone, said extensometer comprising:
- (a) three pins adapted to be inserted into said bone; and
(b) six (6) capacitive sensors mounted across said three pins and each providing a variable capacitance whose value is varied by the strain to which said bone is subjected, wherein said six (6) capacitive sensors are grouped into pairs with each pair being arranged on a five (5) sided member having a sensor face along which said pair is attached and spaced apart from each other.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides for in vivo measurements of the principal strain magnitudes and directions, and maximum shear strain that occurs in a material, such as human bone, when it is loaded (or subjected to a load). In one embodiment the invention includes a capacitive delta extensometer arranged with six sensors in a three piece configuration, with each sensor of each pair spaced apart from each other by 120 degrees.
-
Citations
7 Claims
-
1. A capacitive extensometer adapted to be inserted into the bone of a mammal system for sensing the in vivo strain of said bone, said extensometer comprising:
-
(a) three pins adapted to be inserted into said bone; and (b) six (6) capacitive sensors mounted across said three pins and each providing a variable capacitance whose value is varied by the strain to which said bone is subjected, wherein said six (6) capacitive sensors are grouped into pairs with each pair being arranged on a five (5) sided member having a sensor face along which said pair is attached and spaced apart from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification