Method and device for measuring the intra-cranial pressure in the skull of a test subject
First Claim
1. Method of measuring an intra-cranial pressure (ICP) in the skull of a test subject, comprising the steps:
- attaching two electrodes to the skull of the test subject in such a way that the electrodes have an electrical contact with the skull;
obtaining a time curve of an electrical parameter between the two electrodes as an electrical signal (p(t));
determining an extreme value of the electrical signal following a maximum in blood pressure corresponding to a systole with a substantially uniform delay as a first amplitude value (Pmin);
obtaining a second amplitude value (P1) from the electrical signal (p(t)), where this has for the first time after the first amplitude value (Pmin) either a maximum (.P(t)=0) or a turning point (..p(t)=0);
obtaining a third amplitude value (P2) from the electrical signal after the second amplitude value;
obtaining a standardized pressure measurement value from the amplitude values (Pmin, P1, P2) for further utilization.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
23 Citations
35 Claims
-
1. Method of measuring an intra-cranial pressure (ICP) in the skull of a test subject, comprising the steps:
-
attaching two electrodes to the skull of the test subject in such a way that the electrodes have an electrical contact with the skull; obtaining a time curve of an electrical parameter between the two electrodes as an electrical signal (p(t)); determining an extreme value of the electrical signal following a maximum in blood pressure corresponding to a systole with a substantially uniform delay as a first amplitude value (Pmin); obtaining a second amplitude value (P1) from the electrical signal (p(t)), where this has for the first time after the first amplitude value (Pmin) either a maximum (.P(t)=0) or a turning point (..p(t)=0); obtaining a third amplitude value (P2) from the electrical signal after the second amplitude value; obtaining a standardized pressure measurement value from the amplitude values (Pmin, P1, P2) for further utilization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. Device for measuring an intra-cranial pressure (ICP) in the skull of a test subject, comprising:
-
at least two electrodes which are attachable to the skull of the test subject in such a way that the electrodes have an electrical contact with the skull; a measuring device for obtaining an electrical signal (p(t)) which represents a time curve of an electrical parameter between the at least two electrodes; a storage device for storing the electrical signal (p(t)); a computer device for determining an extreme value of the electrical signal (p(t)), which follows a blood pressure maximum corresponding to a systole with a substantially uniform delay, and for determining a first amplitude value (Pmin) of the extreme value and to determine a second amplitude value (P1) from the electrical signal (p(t)) at the point where the electrical signal (p(t)) has for the first time after the first amplitude value (Pmin) either a maximum ((.p(t))=0) or a turning point ((..p(t))=0), and to determine a third amplitude value (P2) from the electrical signal (p(t)) after the second amplitude value (P1), and is used to obtain a standardized pressure measurement value from the amplitude values (Pmin, P1, P2); and utilization devices selected from the group including a display device, a printer, and a writing station for writing out from data carriers. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
-
Specification