Patents by Inventor Asa Uhrenius
Asa Uhrenius has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 7228172Abstract: An implantable bi-ventricular heart stimulating device and system, suitable for treating congestive heart failure, have a control circuit with first and second pacing circuits and first and second sensing circuits. The device operates with time cycles corresponding to normal heart cycles. The control circuit determines: (a) whether a signal typical of an evoked response to a pacing pulse delivered by the first pacing circuit is sensed within a first time interval and (b) whether a signal typical for an R-wave transferred from the second ventricle, or from some other part of the heart, to the first ventricle is detected within a first time window. The operation of the device depends on whether the conditions (a) and (b) are fulfilled.Type: GrantFiled: December 13, 2003Date of Patent: June 5, 2007Assignee: St. Jude Medical ABInventors: Karin Järverud, Nils Holmström, Anders Björling, Asa Uhrenius, Sven-Erik Hedberg, Göran Budgifvars, Hans Strandberg
-
Patent number: 7085602Abstract: An implantable bi-ventricular heart stimulating device (10) has a control circuit with first and second sensing circuits for respectively sensing in the two ventricles and first and second stimulation circuits for respectively stimulating the two ventricles. The control circuit determines whether a signal, sensed by said second sensing circuit, occurs essentially simultaneously with a signal sensed by the first sensing circuit. Furthermore, the control circuit determines whether a further signal is sensed by said second sensing circuit within a predetermined time interval which follows after the signal sensed by the second sensing circuit but within the same time cycle as that signal. If this occurs, the control circuit determines whether the sensed signals represent actual cardiac events, or are likely the result of far field detection.Type: GrantFiled: November 24, 2003Date of Patent: August 1, 2006Assignee: St. Jude Medical ABInventors: Sven-Erik Hedberg, Asa Uhrenius, Karin Jarverud, Hans Strandberg, Nils Holmström, Anders Björling, Göran Budgifvars
-
Patent number: 6961613Abstract: An implantable bi-ventricular heart stimulating device has a control circuit that within a time cycle, delivers pacing pulses with both first and second pacing circuits with a time gap between a pacing pulse delivered by these pacing circuits. The time gap can be such that a pacing pulse delivered by the second pacing circuits falls substantially within a first time interval in which an evoked response can be expected to a pacing pulse delivered by the first pacing circuit. The control circuit performs a temporary modification of the operation of the device such that during at least one time cycle no pacing pulse is delivered by the second pacing circuit during the first time interval.Type: GrantFiled: November 13, 2003Date of Patent: November 1, 2005Assignee: St. Jude Medical ABInventors: Anders Björling, Nils Holmström, Sven-Erik Hedberg, Asa Uhrenius
-
Publication number: 20040243187Abstract: An implantable bi-ventricular heart stimulating device (10) has a control circuit with first and second sensing circuits for respectively sensing in the two ventricles and first and second stimulation circuits for respectively stimulating the two ventricles. The control circuit determines whether a signal, sensed by said second sensing circuit, occurs essentially simultaneously with a signal sensed by the first sensing circuit. Furthermore, the control circuit determines whether a further signal is sensed by said second sensing circuit within a predetermined time interval which follows after the signal sensed by the second sensing circuit but within the same time cycle as that signal. If this occurs, the control circuit determines whether the sensed signals represent actual cardiac events, or are likely the result of far field detection.Type: ApplicationFiled: November 24, 2003Publication date: December 2, 2004Applicant: St. Jude Medical ABInventors: Sven-Erik Hedberg, Asa Uhrenius, Karin Jarverud, Hans Strandberg, Nils Holmstrom, Anders Bjorling, Goran Budgifvars
-
Publication number: 20040127951Abstract: An implantable bi-ventricular heart stimulating device and system, suitable for treating congestive heart failure, have a control circuit with first and second pacing circuits and first and second sensing circuits. The device operates with time cycles corresponding to normal heart cycles. The control circuit determines: (a) whether a signal typical of an evoked response to a pacing pulse delivered by the first pacing circuit is sensed within a first time interval and (b) whether a signal typical for an R-wave transferred from the second ventricle, or from some other part of the heart, to the first ventricle is detected within a first time window. The operation of the device depends on whether the conditions (a) and (b) are fulfilled.Type: ApplicationFiled: December 13, 2003Publication date: July 1, 2004Applicant: St. Jude Medical ABInventors: Karin Jarverud, Nils Holmstrom, Anders Bjorling, Asa Uhrenius, Sven-Erik Hedberg, Goran Budgifvars, Hans Strandberg
-
Publication number: 20040116971Abstract: An implantable bi-ventricular heart stimulating device has a control circuit that within a time cycle, delivers pacing pulses with both first and second pacing circuits with a time gap between a pacing pulse delivered by these pacing circuits. The time gap can be such that a pacing pulse delivered by the second pacing circuits falls substantially within a first time interval in which an evoked response can be expected to a pacing pulse delivered by the first pacing circuit. The control circuit performs a temporary modification of the operation of the device such that during at least one time cycle no pacing pulse is delivered by the second pacing circuit during the first time interval.Type: ApplicationFiled: November 13, 2003Publication date: June 17, 2004Applicant: St. Jude Medical ABInventors: Anders Bjorling, Nils Holmstrom, Sven-Erik Hedberg, Asa Uhrenius
-
Publication number: 20040010293Abstract: In a cardiac stimulating device and method for biventricular stimulation, the V-V interval between the stimulation pulses to the right and left ventricles is variable, and a farfield ECG obtained from measuring electrodes located outside of the heart is used for monitoring the mechanical synchronization between the right and left ventricles. The mechanical synchronization is optimized by an automatic adjustment of the V-V interval until the ORS duration is minimized.Type: ApplicationFiled: June 19, 2003Publication date: January 15, 2004Applicant: St. Jude Medical ABInventors: Nils Holmstrom, Martin Obel, Anders Bjorling, Sven-Erik Hedberg, Asa Uhrenius, Goran Budgifars
-
Publication number: 20030093126Abstract: Implantable heart stimulator comprising a pulse generating means 4 for generating stimulation pulses adapted to be applied to a heart via at least one electrode lead 6, a control means 8 with threshold search means 10 for initiating a stimulation threshold search in order to determine a stimulation threshold of heart tissue. The control means further comprises threshold search timing means 12 that generates a timing signal at same time(s) every day in order to initiate threshold searches provided that a stable condition index fulfils predetermined criteria. The stable condition index is related to the condition of the heart and is based on result from at least one heart stability test.Type: ApplicationFiled: September 25, 2002Publication date: May 15, 2003Inventors: Martin Obel, Budgifvars Goran, Asa Uhrenius
-
Patent number: 6473650Abstract: A heart stimulator has an evoked response detector for determining evoked response in the presence of polarization. The heart stimulator produces stimulation pulses of different amplitudes via a lead introduced to the heart of the patient. The evoked response detector measures an electrode signal picked up by the lead after each stimulation pulse. In order to set an evoked response threshold value, the pulse generator of the stimulator is controlled to deliver at least two stimulation pulses with different amplitudes, at least one of these stimulation pulses having a high amplitude that exceeds the stimulation threshold value. A measuring unit in the evoked response detector measures the picked up electrode signals, and a calculating unit in the evoked response detector calculates the polarization for the high stimulation amplitude and identifies a measured electrode signal for the lowest possible stimulation amplitude from the measured electrode signals.Type: GrantFiled: February 23, 2001Date of Patent: October 29, 2002Assignee: St. Jude Medical ABInventors: Berit Larsson, Asa Uhrenius, Peter Andersson, Göran Budgivars
-
Patent number: 6029088Abstract: An evoked response detector for a heart stimulator determines evoked response in the presence of polarization. The heart stimulator has a pulse generator which produces stimulation pulses of varying amplitudes, and a lead adapted for introduction into the heart of a patient is connected to the pulse generator for delivering stimulation pulses to the heart. The evoked response detector includes measuring and memory circuitry for measuring and storing the electrode signals picked up by the lead in response to the delivered stimulation pulses, at least one of these stimulation pulses having a sufficiently high amplitude for obtaining capture. Each measured electrode signal contains two signal components, one of these signal components being proportional to the amplitude of the associated stimulation pulse and the other signal component being substantially constant, independent of the associated stimulation pulse amplitude.Type: GrantFiled: September 29, 1998Date of Patent: February 22, 2000Assignee: Pacesetter ABInventors: Goran Budgifvars, Asa Uhrenius, Peter Andersson