Calibration of in vivo blood pressure sensors
First Claim
1. An apparatus for performing an in-vivo calibration of a blood pressure sensor that is associated with a balloon of an in-vivo balloon system, comprising:
- a drive unit configured to control at least one of an inflation state and a deflation state of the balloon, the control comprising slowing a normal inflation and/or deflation process associated with cardiac assist such that the balloon transitions through a state in which a gas pressure in the balloon system is indicative of a patient'"'"'s blood pressure without suspending the inflation or deflation of the balloon; and
a processing unit configured to monitor the patient'"'"'s blood pressure by observing the gas pressure in the balloon system while simultaneously monitoring the patient'"'"'s blood pressure through the sensor, and configured to use the blood pressure readings obtained by monitoring the gas pressure to correct the blood pressure measurements obtained through the sensor.
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Accused Products
Abstract
A method for performing an in-vivo calibration of a blood pressure sensor that is associated with an in-vivo balloon system. The method involves monitoring a patient'"'"'s blood pressure by observing the system gas pressure while at the same time monitoring the patient'"'"'s blood pressure through the sensor. The blood pressure measurements obtained by monitoring the system gas pressure are used as reference, or “true,” blood pressure measurements, and an “offset” is determined between the reference blood pressure measurements and the blood pressure measurements obtained through the sensor. The offset can be stored in a memory, which may also store sensor sensitivity data. The offset and/or sensitivity data may be used to adjust future measurements obtained from the sensor, thereby generating calibrated sensor measurements.
10 Citations
20 Claims
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1. An apparatus for performing an in-vivo calibration of a blood pressure sensor that is associated with a balloon of an in-vivo balloon system, comprising:
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a drive unit configured to control at least one of an inflation state and a deflation state of the balloon, the control comprising slowing a normal inflation and/or deflation process associated with cardiac assist such that the balloon transitions through a state in which a gas pressure in the balloon system is indicative of a patient'"'"'s blood pressure without suspending the inflation or deflation of the balloon; and a processing unit configured to monitor the patient'"'"'s blood pressure by observing the gas pressure in the balloon system while simultaneously monitoring the patient'"'"'s blood pressure through the sensor, and configured to use the blood pressure readings obtained by monitoring the gas pressure to correct the blood pressure measurements obtained through the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An intra-aortic balloon pump comprising:
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a drive unit configured to communicate with an intra-aortic balloon catheter, the intra-aortic balloon catheter being connected to a balloon, the drive unit configured to control an inflation and deflation of the balloon, and the control comprising slowing a normal inflation and/or deflation process associated with cardiac assist, and a processing unit configured to monitor a patient'"'"'s blood pressure by monitoring the pressure within the balloon without suspending the inflation or deflation of the balloon. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification