Intracranial pressure gauge
AssigneeNaganokeiki Seisakujo Company, Ltd.
InventorsIwao Sakaguchi, Kunihiko Osaka, Shigenori Hokari, Kenichi Takahashi
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Abstract
The present disclosure is directed to an intracranial pressure gauge which comprises a powerless resonance circuit composed of a coil and a condenser; a sensor equipped with a pressure-sensitive section capable, when implanted under the scalp, of changing either the inductance of the said coil or the capacitance of the said condenser in response to a change in intracranial pressure; and a grid dip meter capable of externally measuring the change in the resonance frequency of said sensor.
Claims9
An intracranial pressure gauge which comprises,
- a powerless resonance circuit composed of a coil and a condenser;
- a sensor equipped with a pressure-sensitive section including an evacuated bellows which is capable, when implanted under the scalp, of changing the inductance of the said coil in response to a change in the length of the evacuated bellows with changing intracranial pressure;
- and
- a grid dip meter capable of externally measuring the change in the resonance frequency of the said sensor.
An intracranial pressure gauge which comprises,
- a powerless resonance circuit composed of a coil containing a core member and a condenser, said core member being attached to an evacuated bellows;
- a sensor equipped with a pressure-sensitive section capable, when implanted under the scalp, to operatively permit said core to move within the said coil as the change in intracranial pressure causes the said evacuated bellows to change its length, thereby changing the inductance of the said coil;
- and
- a grid dip meter capable of externally measuring the change in the resonance frequency of the said sensor.
An intracranial pressure gauge which comprises,
- a powerless resonance circuit composed of a coil containing a core member having a cylinder section, and a condenser, said core member being attached to an evacuated bellows;
- a sensor equipped with a pressure-sensitive section capable, when implanted under the scalp, to operatively permit said cylinder section of the provided core to move within the said coil as the change in intracranial pressure causes the provided evacuated bellows to change its length, thereby changing its inductance;
- and
- a grip dip meter capable of externally measuring the change in the resonance frequency of the said sensor.
An intracranial pressure gauge which comprises,
- a powerless resonance circuit composed of a coil and a condenser;
- a sensor equipped with a pressure-sensitive section including an evacuated bellows which is capable, when implanted under the scalp, of changing the inductance of the said coil in response to a change in the length of the evacuated bellows with changing intracranial pressure conveyed via the meninges, and
- a grid dip meter capable of externally measuring the change in the resonance frequency of the said sensor.
An intracranial pressure gauge which comprises,
- a powerless resonance circuit composed of a coil and a condenser;
- a sensor equipped with a pressure-sensitive section including an evacuated bellows which is capable, when implanted under the scalp, of changing the inductance of the said coil in response to the change in the length of said evacuated bellows with changing intracranial pressure;
- a grid dip meter capable of externally measuring the change in the resonance frequency of said sensor;
- and
- a device capable of synthesizing the resonance frequency signal of the said grid dip meter and the standard frequency signal.
Dependencies are inferred from the claim text.