Synchronization of Repetitive Therapeutic Interventions

• US 20100222681A1
• Filed: 05/13/2010
• Published: 09/02/2010
• Est. Priority Date: 09/14/2005
• Status: Active Grant

• Current Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Original Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Inventors: Freeman, Gary A., Lisogurski, Daniel M.
• Granted Patent: US 8,858,445 B2
• Time in Patent Office: Days
• US Class Current: 600/454
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61H 2201/5007 computer controlled
• CPC Class Codes: A61H 2201/501 connected to external computer devices or networks
• CPC Class Codes: A61H 2201/5043 Displays
• CPC Class Codes: A61H 2201/5048 Audio interfaces, e.g. voice or music controlled
• CPC Class Codes: A61H 2201/5084 Acceleration sensors
• CPC Class Codes: A61H 2201/5097 wireless
• CPC Class Codes: A61H 2230/04 Heartbeat characteristics, e.g. E.G.C., blood pressure modulation
• CPC Class Codes: A61H 2230/205 partial CO2-value
• CPC Class Codes: A61H 2230/207 partial O2-value
• CPC Class Codes: A61H 2230/25 Blood flowrate, e.g. by Doppler effect
• CPC Class Codes: A61H 2230/42 Rate
• CPC Class Codes: A61H 31/00 Artificial respiration or heart stimulation, e.g. heart massage artificial respiration by treatment with gas or air, e.g. mouth-to-mouth respiration A61M16/00; applying electric currents by contact electrodes for stimulation, e.g. heart pace-makers A61N1/36 ; teaching or training models, demonstration models for medical purposes G09B23/288
• CPC Class Codes: A61H 31/005 with feedback for the user
• CPC Class Codes: A61H 31/006 Power driven
• CPC Class Codes: A61H 31/007 Manual driven
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61N 1/3625 External stimulators
• CPC Class Codes: A61N 1/3628 using sub-threshold or non-excitatory signals
• CPC Class Codes: A61N 1/39044 in combination with cardiopulmonary resuscitation [CPR] therapy
• CPC Class Codes: A61N 7/00 : Ultrasound therapy lithotripsy A61B17/22, A61B17/225; massage using supersonic vibration A61H23/00 ; using ultrasound for introducing media into the body A61M37/0092

Abstract

A medical device of the type used for assisting a user in manually delivering repetitive therapy to a patient (e.g., chest compressions or ventilations in cardiac resuscitation), the device comprising a feedback device configured to generate feedback cues to assist the user in timing the delivery of the repetitive therapy, at least one sensor or circuit element configured to detect actual delivery times, at which the user actually delivers the repetitive therapy, and a processor, memory, and associated circuitry configured to compare the actual delivery times to information representative of desired delivery times to determine cue times at which the feedback cues are generated by the feedback device.

Claims

1. An ultrasonic sensor system for measuring blood flow, the sensor system comprising

an ultrasonic probe positioned at the end of a catheter, the probe and catheter being configured to be inserted into or at the opening of the esophagus,

wherein the probe is configured to deliver and measure ultrasonic sound energy posteriorly toward the spine at approximately the cervical vertebra C3-C6, measuring the reflected ultrasound energy from both the vertebrae and blood vessels;

and

a processor, memory, and associated circuitry configured to process the output of the probe to estimate blood flow in an artery or vein by ultrasonic Doppler flow measurement.

2. The system of claim 1 wherein the sensor is combined with a cardiac resuscitation device and the estimated blood flow determined from the sensor output is used in determining the timing of feedback cues delivered to the user.

3. The system of claim 1 wherein the sensor is configured to be inserted into the esophagus and to deliver ultrasonic energy toward the cervical vertebrae to estimate blood flow in the vertebral artery.

4. An ultrasonic sensor system for measuring blood flow, the sensor system comprising

an ultrasonic probe positioned at the end of a catheter, the probe and catheter being configured to be inserted into or at the opening of the esophagus,

wherein the probe is conically shaped such that it seats against the base of the pharynx at the superior end of the esophagus in the area of the esophageal muscle and the wide end of the probe just above that in the lower pharynx,

wherein the probe is configured to deliver and measure ultrasonic sound energy laterally, and

wherein the sensor is configured to deliver ultrasonic energy in a beam directed at an upward angle to intersect the common carotid artery and internal jugular vein;

and

a processor, memory, and associated circuitry configured to process the output of the probe to estimate blood flow in an artery or vein by ultrasonic Doppler flow measurement.

5. The system of claim 4 wherein the processor is configured to process the output of the ultrasonic probe to estimate blood flow velocity for both the carotid artery and jugular vein.

6. The system of claim 5 wherein the processor is configured to calculate a pulsatile index as the difference of the peak aortic velocity and minimum diastolic velocity divided by the average velocity over one cardiac cycle.

7. The system of claim 6 wherein the processor is configured to calculate a resistance index as the difference between the peak aortic velocity and minimum diastolic velocity divided by the peak aortic velocity.