High-resolution medical monitoring apparatus particularly useful for electrocardiographs

• US 6,807,443 B2
• Filed: 04/30/2002
• Issued: 10/19/2004
• Est. Priority Date: 05/01/2001
• Status: Expired due to Term

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Cheetah Medical, Inc. (Baxter International Inc.)
• Inventors: Keren, Hanan
• Primary Examiner(s): MANUEL, GEORGE C
• Application Number:
  US10/134,380
• Publication Number:
  US 20020198460A1
• Time in Patent Office: 903 Days
• Field of Search: 600/509, 600/534, 600/536, 607/28, 607/29, 128/901, 128/902
• US Class Current: 600/509
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/308 for electrocardiography [ECG]

Abstract

Medical monitoring apparatus to be used in an environment including electrical supply lines of a particular line frequency, for monitoring a particular body activity and for producing an electrical output signal corresponding to the monitored body activity includes: a first filter network connected to receive the electrical output signal and tuned to the line frequency for rejecting the line frequency component of the electrical output signal; a second filter network connected to receive the output of the first filter network and also tuned to the line frequency for rejecting the line frequency component of the electrical output signal; and a high impedance coupling between the first and second filter networks.

Claims

1. Medical monitoring apparatus to be used in an environment including electrical supply lines of a particular line frequency, for monitoring a particular body activity and for producing an electrical output signal corresponding to the monitored body activity;

said apparatus, comprising;

a first filter network connected to receive said electrical output signal and tuned to said line frequency for rejecting the line frequency component of said electrical output signal;

a second filter network connected to receive the output of said first filter network and also tuned to said line frequency for rejecting the line frequency component of said electrical output signal;

and a high impedance coupling between said first and second filter networks.

2. The apparatus according to claim 1, wherein at least one of said filter networks includes:

a first capacitor and a second capacitor connected in series with each other to ground;

and an operational amplifier having one input connected from a point between the second capacitor and ground, an output connected to a point between the first and second capacitors, and a second input connect to said output of the operational amplifier.

3. The apparatus according to claim 2, wherein both of said filter networks include said first capacitor, said second capacitor, said operational amplifier, and the electrical connections therebetween.

4. The apparatus according to claim 1, wherein said high impedance coupling between the first and second filter networks is an electrical resistor network.

5. The apparatus according to claim 1, wherein said high impedance coupling between said first and second filter networks is a buffer amplifier.

6. The apparatus according to claim 1, wherein the monitoring apparatus monitors electrocardiograph signals accompanying heart activity.

7. Medical monitoring apparatus to be used in an environment of electrical supply lines of a particular line frequency, for monitoring a particular body activity and for producing an electrical output signal corresponding to the monitored body activity;

said apparatus, including a filter network connected to receive said electrical output signal and tuned to said line frequency for rejecting the line frequency component of said electrical output signal;

said filter network comprising;

a first capacitor and a second capacitor connected in series with each other to ground;

and an operational amplifier having one input connected from a point between the second capacitor and ground, an output connected to a point between the first and second capacitors, and a second input connect to said output of the operational amplifier.

8. The apparatus according to claim 7, wherein the monitoring apparatus monitor electrocardiograph signals accompanying heart activity.