Patent US5003983A successfully refreshed from Google Patents.
US5003983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cardiac monitoring system
Assignee: Cortec Inc
•
Filing: 1988-08-25
•
Granted: 1991-04-02
•
Expires: 2008-08-25
Abstract
Abstract A cardiac monitor system reads an EKG signal and conditions the EKG waveform in a manner that accentuates the information on ST segment location, within the waveform. ST segment location is used to modulate pulse width of a generated square wave permitting fast and accurate access to information regarding ST segment elevation and depression.
Inventors
- 👤 Robert P. Dingwall
- 👤 Howard T. Bellin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:34
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/358
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
83 words
An apparatus for monitoring and converting an EKG waveform comprising electrical sensors for detecting said EKG waveform, a signal conditioning means in communication with said electrical sensors for inverting all negative portions of said detected EKG waveform, a pulse generator means including a low pass filter means for generating pulses having pulse width modulated by a change in location of a ST segment of said EKG waveform, and a comparator means for determining the amount of ST segment deviation from a normal value.
Claim 2
Independent Claim
83 words
An apparatus for monitoring and converting an EKG waveform comprising electrical sensors for detecting said EKG waveform, a signal conditioning means in communication with said electrical sensors for inverting all negative portions of said detected EKG waveform, a pulse generator means including a low pass filter means for generating pulses having pulse width modulated by a change in location of a ST segment of said EKG waveform, and a comparator means for determining the amount of ST segment deviation from a normal value.
Claim 3
Dependent Claim
25 words
In an apparatus as in claim 1, further comprising output means including an alarm for indicating if said ST segment deviation has exceeded pre-selected limits.
Claim 4
Dependent Claim
119 words
In a system for monitoring a heart for the detection of abnormalities is an EKG signal apparatus comprising: (a) signal acquisition means for detecting signal; (b) signal conditioning means in communication with said signal acquisition means and comprising: means for receiving said detected EKG signal; signal adjustment means for normalizing said detected EKG signal; and a signal inverting means for converting said normalized EKG signal into a DC signal; and (c) pulse modulating means in communication with said signal conditioning means and comprising: means for receiving said DC signal; low pass filter means for processing said DC signal; and pulse generating means generating an output pulse, wherein said output pulse is pulse width modulated by said processed DC signal.
Claim 5
Dependent Claim
119 words
In a system for monitoring a heart for the detection of abnormalities is an EKG signal apparatus comprising: (a) signal acquisition means for detecting signal; (b) signal conditioning means in communication with said signal acquisition means and comprising: means for receiving said detected EKG signal; signal adjustment means for normalizing said detected EKG signal; and a signal inverting means for converting said normalized EKG signal into a DC signal; and (c) pulse modulating means in communication with said signal conditioning means and comprising: means for receiving said DC signal; low pass filter means for processing said DC signal; and pulse generating means generating an output pulse, wherein said output pulse is pulse width modulated by said processed DC signal.
Claim 6
Dependent Claim
25 words
The apparatus of claim 3, wherein said signal adjustment means further comprises an automatic gain control circuit with feedback control of said detected EKG signal.
Claim 7
Dependent Claim
31 words
The apparatus of claim 4, wherein said signal inverting means further comprises an inverting amplifier in parallel with a standard amplifier, wherein each amplifier is in series with a separate diode.
Claim 8
Dependent Claim
16 words
The apparatus of claim 5, wherein said pulse generating means comprises a gated pulse generating amplifier.
Claim 9
Dependent Claim
29 words
The apparatus of claim 6, wherein said gated pulse generating amplifier is adapted to receive a set point value, and compare said received C signal to said point value.
Claim 10
Dependent Claim
37 words
The apparatus of claim 7, wherein said gated pulse generating amplifier generates a pulse when said DC signal exceeds said set point value, and terminates said pulse when said DC signal drops below said set point value.
Claim 11
Dependent Claim
15 words
The apparatus of claim 8, wherein said gated pulse generating amplifier generates a square wave.
Claim 12
Independent Claim
83 words
A method for detecting ST segment deviation comprising the steps of: a) detecting an EKG waveform; b) conditioning the EKG waveform by inverting all negative portions of said waveform to positive values and passing said inverted EKG waveform through a low pass filter; c) generating a pulse wherein said pulse is modulated by the change in ST segment location of said EKG waveform; and d) comparing said generated puls with a pulse modulated by an EKG waveform having a normal ST segment location.
Claim 13
Independent Claim
83 words
A method for detecting ST segment deviation comprising the steps of: a) detecting an EKG waveform; b) conditioning the EKG waveform by inverting all negative portions of said waveform to positive values and passing said inverted EKG waveform through a low pass filter; c) generating a pulse wherein said pulse is modulated by the change in ST segment location of said EKG waveform; and d) comparing said generated puls with a pulse modulated by an EKG waveform having a normal ST segment location.
Claim 14
Dependent Claim
19 words
The method of claim 10, wherein said conditioning the EKG waveform includes normalizing the gain in said EKG waveform.
Claim 15
Dependent Claim
28 words
The method of claim 10 further comprising the step of collecting plural pulses and determining an ST deviation based on time averaged changes in the pulses as generated.
References Cited (Backward Citations)
US3267934A
Cited
US3554187A
Cited
US3822696A
Cited
US3858034A
Cited
US3868567A
Cited
US3927663A
Cited
US4172459A
Cited
US4473078A
Cited
US4546776A
Cited
US4754762A
Cited
DE3633983A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |