System and A Method for Determination of an Orientation of a Biomedical Stimulation Device
The application relates to a system ( 1 ) for determination of an orientation ( 14 ) of a biomedical stimulation device ( 2 ) in respect to an object ( 20 ). The system comprises the first biomedical stimulation device ( 2 ) comprising at least two stimulator for elements ( 4 A; 4 C) and a generator ( 22 ) arranged for feeding the stimulator elements ( 4 A; 4 C) with time-varying electric signals ( 6 A; 6 C), wherein the time-varying electric signals ( 6 A; 6 C) differ by a predetermined phase. The system further comprises a sensor device ( 10 ) with a known relative position (X;α) with respect to the first biomedical stimulation device ( 2 ), arranged for sensing a sensing signal ( 8 ) from the stimulator elements ( 4 A; 4 C), wherein the sensing signal ( 8 ) is originated from the time-varying electric signals ( 6 A; 6 C) from the stimulator elements ( 4 A; 4 C) and a processor device ( 12 ) arranged for determining the orientation ( 14 ) of the first biomedical stimulation device ( 2 ) based on a sensed phase of the sensing signal ( 8 ), phases of the time-varying signals ( 6 A; 6 C) and the known relative position (X;α). Said system accurately determines the orientation, i.e. angular position, of the biomedical stimulation device in respect to the object. The orientation is also accurately determined when the biomedical stimulation device is implanted in the object. Such a system is relatively cheap. The application also relates to a method for determination of an orientation ( 14 ) of a first biomedical stimulation device ( 2 ) in respect to an object ( 20 ).
1 . A system for determination of an orientation of a first biomedical stimulation device in respect to an object, the system comprising:
the first biomedical stimulation device comprising at least two stimulator elements;
a generator arranged for feeding the stimulator elements with time-varying electric signals, wherein the time-varying electric signals mutually differ by a predetermined phase;
a sensor device with a known relative position with respect to the first biomedical stimulation device, arranged for sensing a sensing signal from the stimulator elements, wherein the sensing signal is originated from the time-varying electric signals from the stimulator elements; and
a processor device arranged for determining the orientation of the first biomedical stimulation device based on a sensed phase of the sensing signal, phases of the time-varying signals and the known relative position.
2 . The system as claimed in claim 1 , wherein the first biomedical stimulation device is implanted in the object.
3 . The system as claimed in claim 1 , wherein the first biomedical stimulation device is a first deep brain stimulation (DBS) device.
4 . The system as claimed in claim 1 , wherein the sensor device is implanted in the object.
5 . The system as claimed in claim 1 , wherein the sensor device is a second biomedical stimulation device.
6 . The system as claimed in claim 5 , wherein the second biomedical stimulation device is a second deep brain stimulation (DBS) device.
7 . The system as claimed in claim 1 , wherein the time-varying electric signals are sinusoidal patterns.
8 . A method for determination of an orientation of a first biomedical stimulation device in respect to an object, wherein the first biomedical stimulation device comprises stimulator elements, the method comprising the following steps:
feeding the stimulator elements by a generator with time-varying electric signals, wherein the time-varying electric signals mutually differ by a predetermined phase;
sensing a sensing signal from the stimulator elements by a sensor device with a known relative position with respect to the first biomedical stimulation device, wherein the sensing signal is originated from the time-varying electric signals from the stimulator elements; and
determining the orientation of the first biomedical stimulation device based on a sensed phase of the sensing signal, phases of the time-varying signals and the known relative position by a processor device.