Measuring and testing – Vibration – Hardness or compliance
Reexamination Certificate
2005-02-15
2005-02-15
Chapman, John E. (Department: 2856)
Measuring and testing
Vibration
Hardness or compliance
C073S602000, C600S438000
Reexamination Certificate
active
06854331
ABSTRACT:
The present invention facilitates measurement of characteristic values corresponding to hardness of a material to be measured inside a living body using the response of a vibration transmission characteristic without the need to remove other tissue materials of the living body by dissecting or opening the abdomen of the living body. The present invention includes a sensor (12) made up of a transmitter and a receiver, frequency component analysis section (14) for the incident wave and reflected wave, a frequency/phase difference specification section (15) for comparing the spectral distribution of the incident wave with the spectral distribution of the reflected wave and specifying a phase difference θx, which is a difference between the phase of the incident wave and the phase of the reflected wave at each frequency fx, and a phase difference compensating operation section (16) that inputs the frequency fx and phase difference θx, performs compensating operations using a reference transmission characteristic curve which has been obtained as a reference beforehand and obtains a frequency variation df when the input phase difference θx is reduced to zero, and is characterized in that hardness of the material is calculated from df.
REFERENCES:
patent: 5921929 (1999-07-01), Goll et al.
patent: 6308715 (2001-10-01), Weissman et al.
patent: A 3-286751 (1991-12-01), None
patent: A 5-317313 (1993-12-01), None
patent: A 9-84789 (1997-03-01), None
patent: A 9-145691 (1997-06-01), None
patent: A 11-118689 (1999-04-01), None
Omata, “Measurements of the Hardness of a Soft Material with a Piezoelectric Vibrometer and Their Analysis,” Medical Electronics and Bioengineering, vol. 28, No. 1, pp. 1-8, 1990.
Omata et al., “New tactice sensor like the human hand and its applications,” Sensors and Actuators A, 35, pp. 9-15, 1992.
Kusaka et al., “Objective Evaluation of Liver Consistency to Estimate Hepatic Fibrosis and Functional Reserve for Hepatectomy” Journal of the American College of Surgeons, vol. 191, No. 1, pp. 47-53, 2000.
Chapman John E.
Nihon University
Oliff & Berridg,e PLC
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