US5368040A
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US
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Apparatus and method for determining a plurality of hemodynamic variables from a single, chroniclaly implanted absolute pressure sensor
Assignee: Medtronic Inc
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Filing: 1993-08-02
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Granted: 1994-11-29
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Expires: 2013-08-02
Abstract
Abstract A method and apparatus for monitoring and measuring the hemodynamic status of a patient's pulmonary pressure and right atrial pressure. The aforementioned is achieved by using an implanted absolute pressure sensor located in the right ventricle, coupled to an implantable monitoring device, which records pressure values in response to a combination of sensed electrical depolarizations of the atrium and ventricle and occurrence of first and second derivatives of the pressure signal having values less than zero.
Inventors
- 👤 James K. Carney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:07
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; A61B5/72; A61B5/7235; A61B5/7239; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36564; A61N1/3627
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
256 words
A method of pressure monitoring employing an absolute pressure sensor, which provides an output signal having an amplitude which varies according to pressure, comprising: implanting said absolute pressure sensor in said right ventricle of said patient; deriving a first derivative of said output signal; deriving a second derivative of said output signal; providing said output signal to first, second and third holding means for storing signal amplitudes; enabling said first holding means and said second holding means in response to occurrence of an R-wave; thereafter storing a first output signal amplitude in said first holding means in response to said first derivative being less than zero, wherein said first stored output signal amplitude is equal to said patient's pulmonary artery systolic pressure and, storing a second output signal amplitude in said second holding means in response to said second derivative being less than zero, wherein said second stored output value is equal to said patient's pulmonary artery diastolic pressure; enabling said third holding means in response to occurrence of a P-wave: thereafter storing a third output signal amplitude in said third holding means in response to said first derivative being less than zero, wherein said third stored output signal amplitude is equal to said patient's right atrial systolic pressure; delaying said output signal; and storing an amplitude of said delayed output signal in a fourth holding means for storing signal amplitudes in response to occurrence of said P-wave, wherein said stored amplitude of said delayed output signal is equal to said patient's right atrial diastolic pressure.
Claim 2
Independent Claim
256 words
A method of pressure monitoring employing an absolute pressure sensor, which provides an output signal having an amplitude which varies according to pressure, comprising: implanting said absolute pressure sensor in said right ventricle of said patient; deriving a first derivative of said output signal; deriving a second derivative of said output signal; providing said output signal to first, second and third holding means for storing signal amplitudes; enabling said first holding means and said second holding means in response to occurrence of an R-wave; thereafter storing a first output signal amplitude in said first holding means in response to said first derivative being less than zero, wherein said first stored output signal amplitude is equal to said patient's pulmonary artery systolic pressure and, storing a second output signal amplitude in said second holding means in response to said second derivative being less than zero, wherein said second stored output value is equal to said patient's pulmonary artery diastolic pressure; enabling said third holding means in response to occurrence of a P-wave: thereafter storing a third output signal amplitude in said third holding means in response to said first derivative being less than zero, wherein said third stored output signal amplitude is equal to said patient's right atrial systolic pressure; delaying said output signal; and storing an amplitude of said delayed output signal in a fourth holding means for storing signal amplitudes in response to occurrence of said P-wave, wherein said stored amplitude of said delayed output signal is equal to said patient's right atrial diastolic pressure.
Claim 3
Independent Claim
156 words
A method of pressure monitoring employing an absolute pressure sensor, which provides an output signal having an amplitude which varies according to pressure, comprising: implanting said absolute pressure sensor in said right ventricle of said patient; deriving a first derivative of said output signal; deriving a second derivative of said output signal; providing said output signal to first and second holding means for storing signal amplitudes; enabling said first and second holding means in response to occurrence of an R-wave; and thereafter storing a first output signal amplitude in said first holding means in response to said first derivative being less than zero, wherein said first stored output signal amplitude is equal to said patient's pulmonary artery systolic pressure and storing a second output signal amplitude in said second holding means in response to said second derivative being less than zero, wherein said second stored output value is equal to said patient's pulmonary artery diastolic pressure.
Claim 4
Independent Claim
156 words
A method of pressure monitoring employing an absolute pressure sensor, which provides an output signal having an amplitude which varies according to pressure, comprising: implanting said absolute pressure sensor in said right ventricle of said patient; deriving a first derivative of said output signal; deriving a second derivative of said output signal; providing said output signal to first and second holding means for storing signal amplitudes; enabling said first and second holding means in response to occurrence of an R-wave; and thereafter storing a first output signal amplitude in said first holding means in response to said first derivative being less than zero, wherein said first stored output signal amplitude is equal to said patient's pulmonary artery systolic pressure and storing a second output signal amplitude in said second holding means in response to said second derivative being less than zero, wherein said second stored output value is equal to said patient's pulmonary artery diastolic pressure.
Claim 5
Independent Claim
152 words
A method of pressure monitoring employing an absolute pressure sensor, which provides an output signal having an amplitude which varies according to pressure, comprising: implanting said absolute pressure sensor in said right ventricle of said patient; deriving a first derivative of said output signal; providing said output signal to a first holding means for storing signal amplitudes; enabling said first holding means in response to occurrence of a P-wave: thereafter storing a first output signal amplitude value in said first holding means in response to said first derivative value being less than zero, wherein said first stored output signal amplitude is equal to said patient's right atrial systolic pressure; delaying said output signal; and storing an amplitude of said delayed output signal in a second holding means for storing signal amplitudes in response to said P-wave, wherein said second stored output signal amplitude is equal to said patient's right atrial diastolic pressure.
Claim 6
Independent Claim
152 words
A method of pressure monitoring employing an absolute pressure sensor, which provides an output signal having an amplitude which varies according to pressure, comprising: implanting said absolute pressure sensor in said right ventricle of said patient; deriving a first derivative of said output signal; providing said output signal to a first holding means for storing signal amplitudes; enabling said first holding means in response to occurrence of a P-wave: thereafter storing a first output signal amplitude value in said first holding means in response to said first derivative value being less than zero, wherein said first stored output signal amplitude is equal to said patient's right atrial systolic pressure; delaying said output signal; and storing an amplitude of said delayed output signal in a second holding means for storing signal amplitudes in response to said P-wave, wherein said second stored output signal amplitude is equal to said patient's right atrial diastolic pressure.
Claim 7
Dependent Claim
199 words
A pressure monitoring system, comprising: an absolute pressure sensor means for providing an output signal having an amplitude which varies according to pressure, adapted to be implanted in a patient's right ventricle; means for detecting R-waves; means for detecting P-waves; means for deriving a first derivative of said output signal; means for deriving a second derivative of said output signal; first holding means coupled to said pressure sensor, enabled in response to detection of an R-wave, for thereafter storing a first output signal amplitude in response to said first derivative being less than zero; second holding means coupled to said pressure sensor, enabled in response to detection of an R-wave, for thereafter storing a second output signal amplitude in response to said second derivative being less than zero; third holding means coupled to said pressure sensor, enabled in response to detection of an P-wave, for thereafter storing a third output signal amplitude in response to said first derivative being less than zero; delay means coupled to said pressure sensor for providing a delayed output signal; and fourth holding means coupled to delay means, for storing an amplitude of said delayed output signal in response to detection of a P-wave.
Claim 8
Dependent Claim
199 words
A pressure monitoring system, comprising: an absolute pressure sensor means for providing an output signal having an amplitude which varies according to pressure, adapted to be implanted in a patient's right ventricle; means for detecting R-waves; means for detecting P-waves; means for deriving a first derivative of said output signal; means for deriving a second derivative of said output signal; first holding means coupled to said pressure sensor, enabled in response to detection of an R-wave, for thereafter storing a first output signal amplitude in response to said first derivative being less than zero; second holding means coupled to said pressure sensor, enabled in response to detection of an R-wave, for thereafter storing a second output signal amplitude in response to said second derivative being less than zero; third holding means coupled to said pressure sensor, enabled in response to detection of an P-wave, for thereafter storing a third output signal amplitude in response to said first derivative being less than zero; delay means coupled to said pressure sensor for providing a delayed output signal; and fourth holding means coupled to delay means, for storing an amplitude of said delayed output signal in response to detection of a P-wave.
Claim 9
Dependent Claim
125 words
A pressure monitoring system, comprising: an absolute pressure sensor means for providing an output signal having an amplitude which varies according to pressure, adapted to be implanted in a patient's right ventricle; means for detecting R-waves; means for deriving a first derivative of said output signal; means for deriving a second derivative of said output signal; first holding means coupled to said pressure sensor, enabled, in response to detection of an R-wave, for thereafter storing a first output signal amplitude in response to said first derivative being less than zero; and second holding means coupled to said pressure sensor, enabled in response to detection of an R-wave, for thereafter storing a second output signal amplitude in response to said second derivative being less than zero.
Claim 10
Dependent Claim
125 words
A pressure monitoring system, comprising: an absolute pressure sensor means for providing an output signal having an amplitude which varies according to pressure, adapted to be implanted in a patient's right ventricle; means for detecting R-waves; means for deriving a first derivative of said output signal; means for deriving a second derivative of said output signal; first holding means coupled to said pressure sensor, enabled, in response to detection of an R-wave, for thereafter storing a first output signal amplitude in response to said first derivative being less than zero; and second holding means coupled to said pressure sensor, enabled in response to detection of an R-wave, for thereafter storing a second output signal amplitude in response to said second derivative being less than zero.
Claim 11
Dependent Claim
117 words
A pressure monitoring system, comprising: an absolute pressure sensor means for providing an output signal having an amplitude which varies according to pressure, adapted to be implanted in a patient's right ventricle; means for detecting P-waves; means for deriving a first derivative of said output signal; first holding means coupled to said pressure sensor, enabled in response to detection of an P-wave, for thereafter storing a first output signal amplitude in response to said first derivative being less than zero; delay means coupled to said pressure sensor for providing a delayed output signal; and second holding means coupled to delay means, for storing an amplitude of said delayed output signal in response to detection of a P-wave.
Claim 12
Dependent Claim
117 words
A pressure monitoring system, comprising: an absolute pressure sensor means for providing an output signal having an amplitude which varies according to pressure, adapted to be implanted in a patient's right ventricle; means for detecting P-waves; means for deriving a first derivative of said output signal; first holding means coupled to said pressure sensor, enabled in response to detection of an P-wave, for thereafter storing a first output signal amplitude in response to said first derivative being less than zero; delay means coupled to said pressure sensor for providing a delayed output signal; and second holding means coupled to delay means, for storing an amplitude of said delayed output signal in response to detection of a P-wave.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-28 | 1998-05-30 | 1998-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-28 | 2002-05-30 | 2002-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-28 | 2006-05-30 | 2006-11-29 | $7700.00 | Window Closed / Lapsed |