System for transcutaneous monitoring of intracranial pressure
First Claim
1. A system for retrieving biometric data from an organism comprising:
- an intracorporeal device configured to be sealed within the organism;
an extracorporeal device configured to be outside the organism;
a freespace optical data channel established between the intracorporeal device and the extracorporeal device;
a freespace electromagnetic power transmission channel established from the extracorporeal device to the intracorporeal device;
the intracorporeal device further comprising;
an electrically excited reference oscillator;
an electrically excited variable oscillator configured to be in contact with a fluid of the organism;
an optical transmitter coupled to the freespace optical data channel and adapted to transmit an encoded version of a signal related to biometric data that is generated by comparing a reference signal from the reference oscillator to a variable frequency from the variable oscillator;
a transducer crystal electrically connected to the electrically excited variable oscillator; and
,the optical transmitter positioned to transmit the encoded version of the signal to the freespace optical data channel by emitting radiation through the transducer crystal.
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Abstract
A system for measuring and converting to an observer intelligible form an internal physiological parameter of a patient. The invention allows transcutaneous telemetry of intracranial pressure via a system which includes a patient implanted sensor module and an external processing module, optically coupled to the sensor module via an external coupling module. A sensor within the sensor module transduces the measured pressure and a near infrared emitter transmits the telemetry when interrogated by the external coupling module. A set of tuned inductor-crystal circuits comprised in part of a cylindrical crystal oscillator whose resonant frequency is sensed by a dipper circuit arrangement is provided. Power for the sensor module is derived inductively through rectification of a transcutaneously-applied high-frequency alternating electromagnetic field generated within the external coupling module. A computer within the processing module calculates the physiological parameter from the telemetry signal and represents this data in numerical, graphical, or analog format.
47 Citations
22 Claims
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1. A system for retrieving biometric data from an organism comprising:
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an intracorporeal device configured to be sealed within the organism; an extracorporeal device configured to be outside the organism; a freespace optical data channel established between the intracorporeal device and the extracorporeal device; a freespace electromagnetic power transmission channel established from the extracorporeal device to the intracorporeal device; the intracorporeal device further comprising; an electrically excited reference oscillator; an electrically excited variable oscillator configured to be in contact with a fluid of the organism; an optical transmitter coupled to the freespace optical data channel and adapted to transmit an encoded version of a signal related to biometric data that is generated by comparing a reference signal from the reference oscillator to a variable frequency from the variable oscillator; a transducer crystal electrically connected to the electrically excited variable oscillator; and
,the optical transmitter positioned to transmit the encoded version of the signal to the freespace optical data channel by emitting radiation through the transducer crystal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification