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95 results about "PR interval" patented technology
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In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120 and 200ms in duration. The PR interval is sometimes termed the PQ interval.
Suction detection on an axial blood pump using bemf data
ActiveUS20140100413A1Increase pumping speedShorten speedControl devicesBlood pumpsPR intervalBlood pump
The presence or absence of a suction condition in an implantable blood pump is determined at least in part based on a parameter related to flow, such as a parameter related to thrust on the rotor of the pump. A local extreme of the parameter representing the minimum flow during ventricular diastole in an earlier interval is used to establish a threshold value. A value of the parameter representing the minimum flow during ventricular diastole in a later interval is compared to this threshold. If the comparison indicates a substantial decline in the minimum flow between the earlier and later intervals is associated with a suction condition. During the absence of a suction condition, the threshold is continually updated, so that the system does not indicate presence of a suction condition if the flow decreases gradually.
Owner:HEARTWARE INC
Algorithm for the automatic determination of optimal AV an VV intervals
Methods and devices for determining optimal Atrial to Ventricular (AV) pacing intervals and Ventricular to Ventricular (VV) delay intervals in order to optimize cardiac output. Impedance, preferably sub-threshold impedance, is measured across the heart at selected cardiac cycle times as a measure of chamber expansion or contraction. One embodiment measures impedance over a long AV interval to obtain the minimum impedance, indicative of maximum ventricular expansion, in order to set the AV interval. Another embodiment measures impedance change over a cycle and varies the AV pace interval in a binary search to converge on the AV interval causing maximum impedance change indicative of maximum ventricular output. Another method varies the right ventricle to left ventricle (VV) interval to converge on an impedance maximum indicative of minimum cardiac volume at end systole. Another embodiment varies the VV interval to maximize impedance change.
Owner:MEDTRONIC INC
Temporary hair removal method
InactiveUS6824542B2Stable removalEasy to operateDiagnosticsSurgical instrument detailsPR intervalSkin surface
A hand held device generates a predetermined number of pulses of light having a predetermined electromagnetic spectrum, a predetermined duration, a predetermined inter-pulse interval, and a predetermined total energy. The pulse sequence is delivered to a skin surface to temporarily remove hair. A period of time for reappearance of hair on the selected skin surface after the using of the device to remove hair from the selected skin surface is determined by counting the days to hair reappearance after a test light application. Subsequently, the device is used periodically to apply the pulses of light to the selected skin surface at intervals of shorter length than the determined period of hair regeneration, thereby temporarily maintaining the selected skin surface free of visible hair.
Owner:JAY HARVEY H
Biological information processing apparatus and biological information processing method
A biological information processing apparatus obtains a pulse wave signal indicating a pulse wave of a subject, and acceleration measured according to body motion of the subject and calculates an amount of body motion of the subject using the acceleration. By using at least one of the body motion amount and the acceleration, the apparatus approximates a heart rate of the subject and sets a parameter to be used for detection of a pulse interval using the heart rate. Then, the apparatus detects each pulse interval using a pulse waveform indicated by the pulse wave signal and the parameter.
Owner:KK TOSHIBA
Self limited rate response
Owner:MEDTRONIC INC
Optimization of AV intervals in single ventricle fusion pacing through electrogram morphology
ActiveUS8214041B2Reduced magnitudeReduce frequencyHeart stimulatorsArtificial respirationPR intervalAv interval
This document provides a simple and automatic method for determining an optimal AV interval and / or range of AV intervals for, in an exemplary embodiment, LV-only pacing. Such a method provides significant advantages for patients while reducing burdens related to post-implant follow-up by clinicians in that it greatly reduces the need for doing echocardiographic-based AV interval optimization procedures as well as providing a way to dynamically optimize AV intervals as the patient moves about their activities of daily living (ADL).
Owner:MEDTRONIC INC
Hair treatment method
InactiveUS6916316B2Easy to useClean evenlyRotary piston pumpsSurgical instrument detailsPR intervalLight energy
A hand held device generates a predetermined number of pulses of light having a predetermined electromagnetic spectrum, a predetermined duration, a predetermined inter-pulse interval, and a predetermined total energy. The pulse sequence is delivered to a skin surface to temporarily remove hair through the absorption of light energy only by endogenous chromophores of the hair. Exogenous chromophores for light absorpotion are not applied to the skin surface at any time. A period of time for reappearance of hair on the selected skin surface after the using of the device to remove hair from the selected skin surface is determined by counting the days to hair reappearance after a test light application. Subsequently, the device is used periodically to apply the pulses of light to the selected skin surface at intervals of shorter length than the determined period of hair regeneration, thereby temporarily maintaining the selected skin surface free of visible hair.
Owner:JAY HARVEY H
Implantable medical device with ventricular pacing protocol
Owner:MEDTRONIC INC
Methods and Apparatuses for Cardiac Resynchronization Therapy Mode Selection Based on Intrinsic Conduction
Systems and methods for selecting a cardiac resynchronization therapy (CRT) mode involve sensing electrocardiogram (ECG) data for a patient, identifying a PR interval from the sensed ECG data, comparing the PR interval to a threshold, and selecting a CRT mode by selecting between a synchrony optimization mode and a preload optimization mode, the selection based on the comparison of the PR interval to the threshold. A synchrony optimization mode may be selected if the parameter is less than the threshold, and may optimize CRT for fusion between a left ventricular pulse and an intrinsic wavefront. The preload optimization mode may be selected if the parameter is greater than the threshold, and may optimize CRT for fusion between respective wavefronts of the left ventricular pace and a right ventricular pace.
Owner:CARDIAC PACEMAKERS INC
Hair treatment method
A hand held device generates a predetermined number of pulses of light having a predetermined electromagnetic spectrum, a predetermined duration, a predetermined inter-pulse interval, and a predetermined total energy. The pulse sequence is delivered to a skin surface to stimulate hair growth by energizing the hair follicles. The light may be absorbed by endogenous chromophores of the dermal tissues and / or by exogenous chromophores delivered to the dermal tissues. The device is used periodically to apply the pulses of light to the selected skin surface at total energy levels per session that are much lower than the energies used in hair removal treatments.
Owner:JAY HARVEY
Hygiene compliance monitoring system
An electronic hand hygiene compliance system and award indicator that provides realtime reporting of the percent number of hand hygiene events against a programmed target number of hand hygiene events for a given functional area over a given period of time, yeilding hand hygiene compliance. The system keeps up to date compliance for an established group interval until the data is written over by compliance data for the same group interval the following day. In addition, a random hand hygiene event can be identified for a given functional area during a given period of time to trigger an alarm for encouraging hand hygiene activity for a given dispenser or group of dispensers.
Owner:GOJO IND INC
Apparatus and methods for automatic adjustment of av interval to ensure delivery of cardiac resynchronization therapy
The disclosure provides methods and apparatus of left ventricular pacing including automated adjustment of a atrio-ventricular (AV) pacing delay interval and intrinsic AV nodal conduction testing. It includes—upon expiration or reset of a programmable AV Evaluation Interval (AVEI)—performing the following: temporarily increasing a paced AV interval and a sensed AV interval and testing for adequate AV conduction and measuring an intrinsic atrio-ventricular (PR) interval for a right ventricular (RV) chamber. Thus, in the event that the AV conduction test reveals a physiologically acceptable intrinsic PR interval then storing the physiologically acceptable PR interval in a memory structure (e.g., a median P-R from one or more cardiac cycles). In the event that the AV conduction test reveals an AV conduction block condition or if unacceptably long PR intervals are revealed then a pacing mode-switch to a bi-ventricular (Bi-V) pacing mode occurs and the magnitude of the AVEI is increased.
Owner:MEDTRONIC INC
Cardiac rhythm monitoring device
The present invention is a cardiac rhythm-monitoring device, which allows patients to perform a preliminary screening for supraventricular arrhythmia. The device detects beat-to-beat heart rhythms (i.e. the R-R interval between individual heart beats) and performs a screening test to determine if there are indications of arrhythmia. The test looks for variance in the R-R interval that is outside of the normal range, either using a pre-constructed chart based upon general population studies to determine the normal range of variance or using normal distribution analysis of the patient's own heart rhythm to determine the normal range of variance for determining irregular heartbeats, and if there are multiple irregularities within the sensed time frame, the patient is warned of potential supraventricular arrhythmia. By sensing both electrical impulses form the heart and mechanical responses to the heartbeat, the device may augment its analysis.
Owner:BISCHOFF EDWARD T +1
Cardiac rhythm monitoring device
Owner:BISCHOFF EDWARD T +1
Automated polysomnographic assessment for rapid eye movement sleep behavior disorder
Methods and systems for diagnosing or assessing rapid eye movement sleep behavior disorder (RBD). Muscle tone or activity variance during rapid eye movement (REM) and non-rapid eye movement (NREM) sleep intervals of a polysomnogram are compared. A threshold based on the NREM data is used to identify a subject-specific threshold for abnormality in the REM variance. A metric that includes the percentage of REM variance exceeding the threshold relates to RBD.
Owner:MICHIGAN TECHNOLOGICAL UNIVERSITY +1
Fusion Pacing Enhancements
The disclosure provides methods and apparatus of left ventricular pacing including automated adjustment of a atrio-ventricular (AV) pacing delay interval and intrinsic AV nodal conduction testing. It includes—upon expiration or reset of a programmable AV Evaluation Interval (AVEI)—performing the following: temporarily increasing a paced AV interval and a sensed AV interval and testing for adequate AV conduction and measuring an intrinsic atrio-ventricular (PR) interval for a right ventricular (RV) chamber. Thus, in the event that the AV conduction test reveals a physiologically acceptable intrinsic PR interval then storing the physiologically acceptable PR interval in a memory structure (e.g., a median P-R from one or more cardiac cycles). In the event that the AV conduction test reveals an AV conduction block condition or if unacceptably long PR intervals are revealed then a pacing mode-switch to a bi-ventricular (Bi-V) pacing mode occurs and the magnitude of the AVEI is increased.
Owner:MEDTRONIC INC
Apparatus and methods for automatic adjustment of av interval to ensure delivery of cardiac resynchronization therapy
The disclosure provides methods and apparatus of left ventricular pacing including automated adjustment of a atrio-ventricular (AV) pacing delay interval and intrinsic AV nodal conduction testing. It includes—upon expiration or reset of a programmable AV Evaluation Interval (AVEI)—performing the following: temporarily increasing a paced AV interval and a sensed AV interval and testing for adequate AV conduction and measuring an intrinsic atrio-ventricular (PR) interval for a right ventricular (RV) chamber. Thus, in the event that the AV conduction test reveals a physiologically acceptable intrinsic PR interval then storing the physiologically acceptable PR interval in a memory structure (e.g., a median P-R from one or more cardiac cycles). In the event that the AV conduction test reveals an AV conduction block condition or if unacceptably long PR intervals are revealed then a pacing mode-switch to a bi-ventricular (Bi-V) pacing mode occurs and the magnitude of the AVEI is increased.
Owner:MEDTRONIC INC
Suction detection on an axial blood pump using BEMF data
The presence or absence of a suction condition in an implantable blood pump is determined at least in part based on a parameter related to flow, such as a parameter related to thrust on the rotor of the pump. A local extreme of the parameter representing the minimum flow during ventricular diastole in an earlier interval is used to establish a threshold value. A value of the parameter representing the minimum flow during ventricular diastole in a later interval is compared to this threshold. If the comparison indicates a substantial decline in the minimum flow between the earlier and later intervals is associated with a suction condition. During the absence of a suction condition, the threshold is continually updated, so that the system does not indicate presence of a suction condition if the flow decreases gradually.
Owner:HEARTWARE INC
Method for determining a person's sleeping phase which is favourable for waking up
ActiveUS20160007931A1Simple and reliable processGood adhesionAcoustic time signalsElectrocardiographyPR intervalAccelerometer
A pulse wave signal is registered and an occurrence of human limb movements detected during sleep using a pulse wave sensor and an accelerometer. The values of RR intervals and respiratory rate are measured at preset time intervals Δti based on pulse wave signal. Mean P1, minimal P2, and maximal P3 values of RR intervals, the standard deviation of RR intervals P4, average respiratory rate P5 and average number of limb movements P6 are determined based on the above measured values. Function value F(Δti) is determined thereafter as:F(Δti)=−K1P1−K2P2−K3P3+K4P4+K5P5+K6P6,where K1-K6 are weight coefficients characterizing the contribution of the corresponding parameter to function value F(Δti); whereat the onset and termination of sleep phase favorable to awakening is determined by increments of function F(Δti).
Owner:HEALBE
Cardiac rhythm monitoring device
The present invention is a cardiac rhythm-monitoring device, which allows patients to perform a preliminary screening for supraventricular arrhythmia. The device detects beat-to-beat heart rhythms (i.e. the R-R interval between individual heart beats) and performs a screening test to determine if there are indications of arrhythmia. The test looks for variance in the R-R interval that is outside of the normal range, either using a pre-constructed chart based upon general population studies to determine the normal range of variance or using normal distribution analysis of the patient's own heart rhythm to determine the normal range of variance for determining irregular heartbeats, and if there are multiple irregularities within the sensed time frame, the patient is warned of potential supraventricular arrhythmia. By sensing both electrical impulses form the heart and mechanical responses to the heartbeat, the device may augment its analysis.
Owner:BISCHOFF EDWARD T +1
Predicting chronic optimal A-V intervals for biventricular pacing via observed inter-atrial delay
Methods for optimizing the atrio-ventricular (A-V) delay for efficacious delivery of cardiac resynchronization therapy. In CRT devices, the programmed A-V delay starts with detection of electrical activity in the right atrium (RA). Thus, a major component of the A-V delay is the time required for inter-atrial conduction time (IACT) from the RA to the LA. This IACT can be measured during implantation as the time from the atrial lead stimulation artifact to local electrograms in a coronary sinus (CS) catheter. Assuming that the beginning of LA contraction closely corresponds with the beginning of LA electrical activity, the optimal AV delay should be related to the time between the start of RA electrical activity and the start of LA electrical activity plus the duration of LA atrial contraction. Thus ‘during atrial pacing’ the IACT measured at implantation is correlated with the echocardiographically defined optimal paced AV delay (PAV).
Owner:MEDTRONIC INC
Fusion pacing enhancements
The disclosure provides methods and apparatus of left ventricular pacing including automated adjustment of a atrio-ventricular (AV) pacing delay interval and intrinsic AV nodal conduction testing. It includes—upon expiration or reset of a programmable AV Evaluation Interval (AVEI)—performing the following: temporarily increasing a paced AV interval and a sensed AV interval and testing for adequate AV conduction and measuring an intrinsic atrio-ventricular (PR) interval for a right ventricular (RV) chamber. Thus, in the event that the AV conduction test reveals a physiologically acceptable intrinsic PR interval then storing the physiologically acceptable PR interval in a memory structure (e.g., a median P-R from one or more cardiac cycles). In the event that the AV conduction test reveals an AV conduction block condition or if unacceptably long PR intervals are revealed then a pacing mode-switch to a bi-ventricular (Bi-V) pacing mode occurs and the magnitude of the AVEI is increased.
Owner:MEDTRONIC INC
Apparatus and methods for automatic adjustment of av interval to ensure delivery of cardiac resynchronization therapy
Owner:MEDTRONIC INC
System and method for arrhythmia discrimination with atrial-ventricular dissociation
Ventricular arrhythmias are monitored and classified based upon various criteria. One criterion is PR dissociation which is determined by comparing the PR interval in a current RR cycle to a median PR value. If the current PR interval varies too far from the median, then dissociation is indicated. Often, there are multiple atrial events in a given RR interval and the PR value has been based upon the last atrial event in the cycle. An algorithm determines whether to use the last atrial event in a cycle or whether an earlier atrial event occurred and would provide a more accurate PR value.
Owner:MEDTRONIC INC
Cardiac resynchronization via left ventricular pacing
ActiveUS7558626B2Less powerSufficiently conductiveHeart stimulatorsDiagnostic recording/measuringPR intervalVentricular depolarization
The invention is directed to techniques for providing cardiac resynchronization therapy by synchronizing delivery of pacing pulses to the left ventricle with intrinsic right ventricular depolarizations. An implantable medical device measures an interval between an atrial depolarization and an intrinsic ventricular depolarization is measured. In various embodiments, the intrinsic ventricular depolarization may be an intrinsic right or left ventricular depolarization. The implantable medical device delivers pacing pulses to the left ventricle to test a plurality of pacing intervals. The pacing intervals tested may be within a range around the measured interval between the atrial depolarization and the intrinsic ventricular depolarization. One of the pacing intervals is selected based on a measured characteristic of an electrogram that indicates ventricular synchrony. For example, the pacing interval may be selected based on measured QRS complex widths and / or Q-T intervals. The implantable medical device paces the left ventricle based on the selected pacing interval.
Owner:MEDTRONIC INC
Discrimination of atrial fibrillations for an active implantable medical device, in particular a defibrillator/cardiovertor
InactiveUS6889080B2Minimize the possibilityReduce riskHeart defibrillatorsHeart stimulatorsPR intervalRR interval
An active implantable medical device, in particular a defibrillator / cardioverter, with a sophisticated discrimination of atrial fibrillations. This device is able to deliver therapy for defibrillation, cardioversion, and / or ventricular and / or atrial antitachycardiac pacing stimulation; sense the ventricular and atrial activity; identify a suspicion of and confirm the presence of episodes of tachycardia in the activity thus sensed; analyze the stability of detected RR intervals and the stability of the associated PR intervals; and, in the event of a detection of stable RR intervals and unstable PR intervals, discriminate between atrial fibrillation with fast ventricular rhythm and atrial fibrillation with ventricular tachycardia, and to control delivery of a differentiated therapy according to one case or the other. A bi-tachycardia discrimination also can be made.
Owner:SORIN CRM
Self limited rate response
Rate responsive pacing is limited in an atrial based pacing mode by the AV interval in order to avoid or minimize ventricular encroachment of atrial pacing. The AV or VA interval is used to permit rate responsiveness; modulate rate responsiveness or to determine a dynamic upper sensor rate.
Owner:MEDTRONIC INC
Stochastic stimulation in a hearing prosthesis
A hearing prosthesis configured for delivery of stochastic stimulation to a recipient. The hearing prosthesis comprises a sound pickup component configured to receive a sound signal having at least one pitch; a stochastic stimulation generator configured to generate a stochastic sequence of stimulation pulses having first and second inter-pulse intervals distributed stochastically throughout the sequence within controlled limits, the first inter-pulse interval based on the at least one pitch; and at least one stimulation channel to deliver the sequence of electrical stimulation pulses to the recipient.
Owner:COCHLEAR LIMITED
Algorithm for the automatic determination of optimal AV and VV intervals
Owner:MEDTRONIC INC
Algorithm for the automatic determination of optimal pacing intervals
Owner:MEDTRONIC INC
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