Implantable medical device system with sensor for hemodynamic stability and method of use
First Claim
1. A system for evaluating functioning of a heart of a patient in conjunction with an implantable medical device, the system comprising:
- a first sensor capable of sensing activity of a heart atrium;
a second sensor capable of sensing activity of a heart ventricle; and
a processor coupled to the first and second sensors, the processor configured for;
determining an atrial cycle time and a ventricular cycle time for a heartbeat based upon signals from the first and second sensors, generating an active ratio based upon atrial cycle time and ventricular cycle time of an active heartbeat, comparing the active ratio to a hemodynamic baseline ratio, evaluating functioning of the heart based upon the comparison.
1 Assignment
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Accused Products
Abstract
An implantable medical device system for regulating a heart of a patient. The system includes a first sensor, a second sensor, a processor, and a medical device. The first sensor is capable of sensing activity of a heart atrium. The second sensor is capable of sensing activity of a heart ventricle. The processor is coupled to the first and second sensors and is capable of determining an atrial cycle time and a ventricular cycle time based upon signals from the first and second sensors. The processor is further capable of generating a hemodynamic baseline ratio based upon an atrial cycle time and a ventricular cycle time of a hemodynamic heartbeat, as well as an active ratio based upon an atrial cycle time and a ventricular cycle time of an active heartbeat. The processor is further capable of comparing the hemodynamic baseline ratio and the active ratio, and determining a corrective action based upon this comparison. The medical device is capable of supplying a therapy to the heart and is coupled to the processor. With this configuration, the processor is configured to control desired operation of the medical device based upon the determined corrective action.
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Citations
70 Claims
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1. A system for evaluating functioning of a heart of a patient in conjunction with an implantable medical device, the system comprising:
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a first sensor capable of sensing activity of a heart atrium;
a second sensor capable of sensing activity of a heart ventricle; and
a processor coupled to the first and second sensors, the processor configured for;
determining an atrial cycle time and a ventricular cycle time for a heartbeat based upon signals from the first and second sensors, generating an active ratio based upon atrial cycle time and ventricular cycle time of an active heartbeat, comparing the active ratio to a hemodynamic baseline ratio, evaluating functioning of the heart based upon the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An implantable medical device system for regulating a heart of a patient, the system comprising:
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a first sensor capable of sensing activity of a heart atrium;
a second sensor capable of sensing activity of a heart ventricle;
a processor coupled to the first and second sensors, the processor configured for;
determining an atrial cycle time and a ventricular cycle time based upon signals from the first and second sensors, generating a hemodynamic baseline ratio based upon an atrial cycle time and a ventricular cycle time of a hemodynamic heartbeat, generating an active ratio based upon an atrial cycle time and a ventricular cycle time of an active heart beat, comparing the hemodynamic baseline ratio and the active ratio, determining a corrective action based upon the comparison of the hemodynamic baseline ratio and the active ratio; and
a medical device capable of delivering a therapy to the patient and coupled to the processor;
wherein the processor is configured to prompt desired activation of the medical device based upon the determined corrective action. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An implantable medical device system for regulating a heart of a patient, the system comprising:
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first sensing means for sensing an atrial cycle time of a heartbeat;
second sensing means for sensing a ventricular cycle time of a heartbeat;
processing means for generating an active ratio based upon the sensed atrial cycle time and the sensed ventricular cycle time of an active heartbeat;
comparing means for comparing the active ratio to a hemodynamic baseline ratio;
analyzing means for determining a corrective action based upon a comparison of the active ratio and the hemodynamic baseline ratio; and
heart therapy means for delivering a therapy to the patient based upon the determined corrective action. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
determining means for determining the hemodynamic baseline ratio.
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42. The system of claim 41, wherein the determining means includes means for establishing an atrial cycle time and a ventricular cycle time of a hemodynamic heartbeat.
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43. The system of claim 42, wherein the determining means processes information from the first and second sensing means to determine the hemodynamic baseline ratio.
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44. The system of claim 43, wherein the determining means includes means for analyzing a plurality of preliminary ratios each based upon a preliminary atrial cycle time and a preliminary ventricular cycle time for respective preliminary heartbeats.
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45. The system of claim 30, wherein the active ratio is sensed atrial cycle time/sensed ventricular cycle time.
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46. The system of claim 30, further comprising:
recording means for recording a plurality of active ratios.
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47. The system of claim 46, further comprising:
correlating means for correlating the plurality of active ratios in comparison to the hemodynamic baseline ratio.
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48. A method for applying therapy with an implantable medical device to a heart of a patient, the method comprising:
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sensing an atrial cycle time for a first heartbeat;
sensing a ventricular cycle time for the first heartbeat;
generating an active ratio for the first heartbeat based upon the sensed atrial cycle time and the sensed ventricular cycle time;
comparing the active ratio to a hemodynamic baseline ratio;
determining a corrective action based upon the comparison; and
applying a therapy to the heart to effectuate the determined corrective action. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
establishing the hemodynamic baseline ratio.
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58. The method of claim 57, wherein establishing the hemodynamic baseline ratio includes:
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determining an atrial cycle time for a hemodynamic heartbeat; and
determining a ventricular cycle time for a hemodynamic heartbeat.
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59. The method of claim 58, wherein determining an atrial cycle time for a hemodynamic heartbeat includes determining an atrial repolarization period for a hemodynamic heartbeat.
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60. The method of claim 58, wherein establishing the hemodynamic baseline ratio further includes:
determining a ratio of atrial cycle time/ventricular cycle time for a hemodynamic heartbeat.
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61. The method of claim 58, wherein establishing the hemodynamic baseline ratio further includes:
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monitoring a plurality of preliminary heartbeats;
determining an atrial cycle time for each of the preliminary heartbeats;
determining a ventricular cycle time for each of the preliminary heartbeats;
determining a preliminary ratio for each of the preliminary heartbeats, wherein each preliminary ratio is based upon the respective atrial and ventricular cycle times of the preliminary heartbeats; and
correlating the preliminary ratios to establish the hemodynamic baseline ratio.
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62. The method of claim 57, wherein the hemodynamic baseline ratio is a predetermined value.
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63. The method of claim 48, wherein comparing the active ratio to the hemodynamic baseline ratio includes identifying an instability in an atrium of the patient.
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64. The method of claim 48, wherein comparing the active ratio to a hemodynamic baseline ratio includes identifying an instability in a ventricle of the patient.
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65. The method of claim 48, wherein comparing the active ratio to the hemodynamic baseline ratio includes identifying onset of an arrhythmia.
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66. The method of claim 48, further comprising determining a plurality of active ratios based upon atrial cycle time and ventricular cycle time for a plurality of heartbeats, respectively.
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67. The method of claim 66, further comprising formulating an activity trend for the heart based upon the plurality of active ratios.
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68. The method of claim 67, further comprising determining an optimal lower rate limit for the heart based upon the activity trend.
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69. The method of claim 48, wherein applying a therapy to the heart includes delivering an electrical stimulation to the patient.
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70. The method of claim 48, wherein applying a therapy to the heart includes delivering a drug to the patient.
Specification