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 Title: |
US4459995:
Indicating device for use in a device for measuring and indicating changes in resistance of a living body
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Conners, Ron; Los Angeles, CA
McCormick, John; Grass Valley, CA
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| Assignee: |
Hubbard; Lafayette R., Sussex, United Kingdom
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| Published / Filed: |
1984-07-17
/ 1981-09-22
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| Application Number: |
US1981000304594
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| IPC Code: |
Advanced:
G01R 1/30;
G01R 17/10;
Core:
G01R 1/00;
G01R 17/00;
IPC-7:
A61B 5/05;
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| U.S. Class: |
Current:
600/547;
324/154.R;
324/692;
Original:
128/734;
324/154.R;
324/062;
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| Field of Search: |
128/734-735,723,693
324/015,62,154 R,154 PB,151 R,151 A
336/208
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| Priority Number: |
| 1979-03-08 |
US1979000018727 |
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| Abstract: |
In accordance with the invention there is provided an electrical resistance measuring indicating device including a bridge network having on one side thereof a first resistance arm connected to a second resistance arm and on the other side thereof, first voltage arm connected to a second voltage arm, there being between the junction of the first and second resistance arms and the junction of the first and second arms are transisterized amplifier circuit and an undamped indicating means responsive to changes in the balance of the bridge networks so as to indicate or measure the resistance or variation in resistance of a subject such as a body are part connected to the network across one of the resistance arms. The indicating means includes a moving coil meter which includes a metal frame of zero conductivity having a meter coil wound thereon and an indicating needle coupled to the frame.
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| Attorney, Agent or Firm: |
Koda and Androlia ;
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| Primary / Asst. Examiners: |
Cohen, Lee S.; Sykes, Angela D.
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
PRIOR APPLICATIONS
This is a continuation-in-part of Ser. No. 18,727 filed on Mar. 8, 1979 which is now abandoned.
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| Family: |
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First Claim:
Show all 6 claims |
We claim:
1. A device for indicating changes in resistance of a living body comprising a bridge network having on one side therof a first resistance arm connected in series with a second resistance arm, and on another side thereof a first voltage arm connected in series with a second voltage arm, there being connected in series between the junction of the first and second resistance arms and the first and second voltage arms a transistorized amplifier circuit and current indicating means showing the changes in balance of said bridge network, two electrodes adapted to be connected to a living body, one of said electrodes being electrically connected to a terminal of one of said resistance arms, whereby said living body is adapted to be connected across said one of the resistance arms, a range control device comprising a potentiometer connected in parallel with said first voltage arm, said potentiometer having a sliding contact electrically connected to a terminal of said first voltage arm, the other of said electrodes being electrically connected to said sliding contact, a variable resistance electrically connected to said one electrode and the junction of the first and second resistance arms, said variable resistance being adjustable to enable a balance to be established in an initial setting of the bridge network, said amplifier circuit comprising a transistor emitter follower and cascaded second and third transistors connected to the output of said emitter follower, the collector of said second transistor being connected to the emitter of said transistor emitter follower and the current indicating means comprising an uncritically damped moving coil meter electrically connected between the collector of the third transistor and the first voltage arm, said uncritically damped moving coil meter consisting of an iron cylinder pivotally supporting a metal frame with zero conductivity having a meter coil wound thereon and an indicator needle fixed to said frame, a sensitivity control branch connected across the second voltage arm and comprising two series-connected resistors, at least one of which is variable, the junction of said series-connected resistors being connected to the emitter of said second transistor, said electrodes being connected directly to the base of the transistor emitter follower, and a resistive negative feedback branch connecting the output of the amplifier circuit to the base of the transistor emitter follower.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 13 U.S. patent(s) that reference this one
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