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1. US6146336 - Method and device for measuring the intra-cranial pressure in the skull of a test subject

Office
United States of America
Application Number 09125652
Application Date 19.01.1999
Publication Number 6146336
Publication Date 14.11.2000
Grant Number 6146336
Grant Date 14.11.2000
Publication Kind A
IPC
A61B 5/00
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
A61B 5/0205
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
02Measuring pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography; Heart catheters for measuring blood pressure
0205Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
A61B 5/03
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
03Measuring fluid pressure within the body other than blood pressure, e.g. cerebral pressure
A61B 5/05
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
05Measuring for diagnosis by means of electric currents or magnetic fields
A61B 5/053
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
05Measuring for diagnosis by means of electric currents or magnetic fields
053Measuring electrical impedance or conductance of a portion of the body
CPC
A61B 5/053
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes
05Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
053Measuring electrical impedance or conductance of a portion of the body
A61B 5/0205
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes
02Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
0205Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
A61B 5/031
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes
03Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; ; Measuring pressure in body tissues or organs
031Intracranial pressure
A61B 5/4884
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes
48Other medical applications
4884inducing physiological or psychological stress, e.g. applications for stress testing
Applicants Nicolet Biomedical Inc.
Inventors Paulat Klaus
Agents Westman, Champlin & Kelly, P.A.
Priority Data 19606687 22.02.1996 DE
Title
(EN) Method and device for measuring the intra-cranial pressure in the skull of a test subject
Abstract
(EN)

In order to detect the intra-cranial pressure in the skull of a test subject it is proposed to attach to the skull at least two electrodes in such a way that they have an electrical contact with the skull. Via a measuring device, the time curve of an electrical resistance and/or of a capacitance between the two electrodes is obtained as an electrical signal (p(t)). An extreme value of the electrical signal, following a blood pressure maximum according to a systole with a substantially uniform delay, is determined as a first amplitude value. A second amplitude value is obtained from the electrical signal (p(t)). This value is accepted at a point where the electrical signal has for the first time after the first amplitude value either a maximum or a turning point. A third amplitude value is obtained from the electrical signal after the second amplitude value. A standardized pressure measurement value is obtained from the amplitude values for further utilization. By means of this type of measurement it is possible to establish the intra-cranial pressure of a test subject in a simple, rapid and cost-effective manner, and to observe it even over lengthy periods, without thereby stressing the test subject.

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