Active antenna for medical telemetry monitoring systems
First Claim
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1. An active antenna assembly for receiving transmitted rf signals representing physiological conditions of a patient, comprising:
- a housing;
at least one passive reception element within said housing for receiving transmitted rf signals;
first amplifying means within said housing for amplifying the rf signals received by the reception element;
combining means within said housing for combining rf signals which have been amplified by said first amplifying means with rf signals from a second antenna assembly;
first connector means adapted for connecting an output of said combining means to a cable for carrying rf signals; and
second connector means adapted for connecting a cable carrying rf signals from an output of a second antenna assembly to said combining means.
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Abstract
A telemetry system and associated antenna for monitoring the physiological condition of hospitalized patients. The antenna consists of two separate sections. The first is the antenna pre-amp section and contains passive receiving antenna elements integrated with a transistor amplifier. The second section provides the required circuitry that allows cascading of additional active antennas. Monitoring a number of patients may be accomplished from a receiver located in a central location. The antennas are small for suitability within a hospital environment, yet offer superior signal/noise performance.
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Citations
19 Claims
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1. An active antenna assembly for receiving transmitted rf signals representing physiological conditions of a patient, comprising:
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a housing; at least one passive reception element within said housing for receiving transmitted rf signals; first amplifying means within said housing for amplifying the rf signals received by the reception element; combining means within said housing for combining rf signals which have been amplified by said first amplifying means with rf signals from a second antenna assembly; first connector means adapted for connecting an output of said combining means to a cable for carrying rf signals; and second connector means adapted for connecting a cable carrying rf signals from an output of a second antenna assembly to said combining means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A telemetry system for monitoring the physiological condition of patients having transmitters for generating rf signals corresponding to a physiological condition, comprising:
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a plurality of antenna assemblies, each of said assemblies including at least one passive reception element for receiving rf signals, first amplifying means for amplifying the rf signals received by the reception element, and combining means for combining rf signals which have been amplified by said first amplifying means with rf signals from another antenna assembly; each of said antenna assemblies being connected in series by means of cables connecting respective inputs and outputs of the combining means of the respective antenna assemblies; a receiver connected to the output of the combining means of one of the antenna assemblies; and a power supply means connected to the output of the combining means of one of said antenna assemblies such that the required operating voltage for each of the series connected antenna assemblies is provided by said power source via the cables connecting the respective combining means. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification