Fetal monitoring system and method

• US 5,954,663 A
• Filed: 05/20/1997
• Issued: 09/21/1999
• Est. Priority Date: 05/22/1996
• Status: Expired due to Fees

• Current Assignee: Midas Medical Technologies Limited
• Original Assignee: Midas Medical Technologies Limited
• Inventors: Gat, Yigal
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US08/859,146
• Time in Patent Office: 854 Days
• Field of Search: 610/453, 610/511, 610/588, 610/591, 128/903, 128/904
• US Class Current: 600/511
• CPC Class Codes: A61B 5/0011 Foetal or obstetric data
• CPC Class Codes: A61B 5/4356 Assessing uterine contractions A61B5/033 takes precedence
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: G16H 50/30 for calculating health indices; for individual health risk assessment

Abstract

A system and method for monitoring the condition of at least one fetus is provided. The fetal monitoring system includes a plurality of fetal well-being sensors, each of which detects signals during a monitoring period. The system also includes at least one interface unit, a central processing unit connected to the interface unit and a monitoring unit connected to the central processing unit. The interface unit is connected to the fetal well-being sensor for transmitting the detected signals. The central processing unit includes means for receiving and processing the signals . The monitoring unit enables the medical staff to monitor the transmitted and processed signals.

Claims

1. A system for monitoring the condition of a fetus, the system comprising:

(a) a plurality of sensors each of said sensors being deployable so as to generate an output indicative of a physiological parameter;

(b) a processing unit associated with all of said sensors, said processing unit being configured;

(i) to process said outputs to derive at least one calculated parameter related to fetal well-being, and

(ii) to apply fetal well-being test criteria to said at least one calculated parameter to identify occurrence of an alarm condition; and

(c) a monitoring unit associated with said processing unit, said monitoring unit being responsive to identification of an alarm condition to generate an alarm signal,

wherein said fetal well-being test criteria include at least one multiple-level threshold test wherein an alarm condition is identified both when a first of said at least one calculated parameter passes a first threshold level for in excess of a first time period and when said first calculated parameter passes a second threshold level differing from said first threshold for in excess of a second time period longer than said first time period.

2. The system as in claim 1, wherein said first calculated parameter is a score based on at least fetal heart rate variability.

3. The system as in claim 2, wherein said second time period is at least about 1/2 hour.

4. The system as in claim 2, wherein said processor unit is configured to derive said score of fetal heart rate variability based upon measurements taken during a sliding window of about 5 minutes.

5. The system as in claim 1, further comprising a user input device associated with said processor unit for inputting data associated with a medical treatment being administered, said processor unit being responsive to said data to change said fetal well-being test criteria applied to said at least one calculated parameter.

6. The system as in claim 1, wherein said processor unit includes a database of fetal heart rate patterns indicative of fetal distress, said processor unit being further configured to employ said database in application of said fetal well-being test criteria.

7. The system as in claim 1, wherein said monitoring unit is further configured to display said sensor outputs.

8. The system as in claim 7, further comprising an archiving unit associated with said processor unit, said archiving unit including data storage means and being configured to maintain a record of said sensor outputs, the system being further configured to assume a replay mode in which said record of said sensor outputs is read from said archiving unit and displayed by said monitoring unit.

9. The system as in claim 1, wherein said plurality of sensors are referred to as a first plurality of sensors and are deployable so as to generate an output indicative of a physiological parameter relating to a first fetus, the system further comprising a second plurality of sensors similar to said first plurality of sensors, each sensor of said second plurality of sensors being deployable so as to generate an output indicative of a physiological parameter relating to a second fetus, wherein said processor unit is additionally associated with said second plurality of sensors and is further configured to process outputs from said second plurality of sensors.

10. A system for monitoring the condition of at least one fetus, the system comprising:

(a) a plurality of sensors each of said sensors being deployable so as to generate an output indicative of a physiological parameter;

(b) a processing unit associated with all of said sensors, said processing unit being configured;

(i) to process said outputs to derive at least one calculated parameter related to fetal well-being, and

(ii) to apply fetal well-being test criteria to said at least one calculated parameter to identify occurrence of an alarm condition;

(c) a monitoring unit associated with said processing unit, said monitoring unit being responsive to identification of an alarm condition to generate an alarm signal; and

(d) a user input device associated with said processor unit for inputting data associated with a medical treatment being administered,

wherein said processor unit is responsive to said data to change said fetal well-being test criteria applied to said at least one calculated parameter.

11. A system for monitoring the condition of at least one fetus, the system comprising:

(a) a plurality of sensors each of said sensors being deployable so as to generate an output indicative of a physiological parameter, said plurality of sensors including a fetal heart activity sensor;

(b) a processing unit associated with all of said sensors, said processing unit including a database of fetal heart rate patterns indicative of fetal distress, said processor unit being configured;

(i) to process said outputs to derive at least a measured fetal heart rate pattern, and

(ii) to compare said measured fetal heart rate pattern with said fetal heart rate patterns indicative of fetal distress to identify occurrence of an alarm condition; and

(c) a monitoring unit associated with said processing unit, said monitoring unit being responsive to identification of an alarm condition to generate an alarm signal.

12. A system for monitoring the condition of a fetus, the system comprising:

(a) a plurality of sensors each of said sensors being deployable so as to generate an output indicative of a physiological parameter;

(b) a processing unit associated with all of said sensors, said processing unit being configured;

(i) to process said outputs to derive at least one calculated parameter related to fetal well-being, and

(ii) to apply fetal well-being test criteria to said at least one calculated parameter to identify occurrence of an alarm condition;

(c) a monitoring unit associated with said processing unit configured to display said sensor outputs, said monitoring unit being responsive to identification of an alarm condition to generate an alarm signal; and

(d) an archiving unit associated with said processor unit, said archiving unit including data storage means and being configured to maintain a record of said sensor outputs,

wherein the system is further configured to assume a replay mode in which said record of said sensor outputs is read from said archiving unit and displayed by said monitoring unit.