Synchronizing chest compression and ventilation in cardiac resuscitation

• US 9,174,064 B2
• Filed: 05/26/2011
• Issued: 11/03/2015
• Est. Priority Date: 02/16/2006
• Status: Active Grant

• Current Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Original Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Inventors: Freeman, Gary A.
• Primary Examiner(s): Thanh, Quang D
• Application Number:
  US13/116,200
• Publication Number:
  US 20110224587A1
• Time in Patent Office: 1,622 Days
• Field of Search: 601 41- 44, 601/108, 601/152, 601DIG 8- 10, 128/204.23, 128/205.19, 607/13
• US Class Current: 1/1
• CPC Class Codes: A61H 2201/0207 heated
• CPC Class Codes: A61H 2201/0214 cooled
• CPC Class Codes: A61H 2201/025 by direct air flow on the patient's body
• CPC Class Codes: A61H 2201/0257 by a heat accumulator, e.g. a sand or liquid reservoir
• CPC Class Codes: A61H 2201/0285 with Peltier elements
• CPC Class Codes: A61H 2201/10 with further special therapeutic means, e.g. electrotherapy, magneto therapy or radiation therapy, chromo therapy, infrared or ultraviolet therapy
• CPC Class Codes: A61H 2201/105 with means for delivering media, e.g. drugs or cosmetics
• CPC Class Codes: A61H 2201/107 Respiratory gas
• 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 2201/5089 Gas sensors, e.g. for oxygen or CO2
• CPC Class Codes: A61H 2230/04 Heartbeat characteristics, e.g. E.G.C., blood pressure modulation
• CPC Class Codes: A61H 2230/08 Other bio-electrical signals
• CPC Class Codes: A61H 2230/205 partial CO2-value
• CPC Class Codes: A61H 2230/207 partial O2-value
• CPC Class Codes: A61H 31/004 Heart stimulation
• CPC Class Codes: A61H 31/006 Power driven
• CPC Class Codes: A61M 16/00 Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes stimulating the respiratory movement by mechanical, pneumatic or electrical means, iron lungs combined with gas breathing means A61H31/00
• CPC Class Codes: A61M 16/0069 : the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/021 : operated by electrical means A61M16/202 – A61M16/205 take precedence
• CPC Class Codes: A61M 16/1075 : by influencing the temperature A61M16/1045 takes precedence
• CPC Class Codes: A61M 2205/3344 : Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/50 : with microprocessors or computers
• CPC Class Codes: A61M 2230/04 : Heartbeat characteristics, e.g. ECG, blood pressure modulation
• CPC Class Codes: A61N 1/39044 : in combination with cardiopulmonary resuscitation [CPR] therapy
• CPC Class Codes: A61N 1/3987 : characterised by the timing or triggering of the shock
• CPC Class Codes: Y10S 601/08 : Artificial respiration with computer control

Abstract

Apparatus for automatic delivery of chest compressions and ventilation to a patient, the apparatus including: a chest compressing device configured to deliver compression phases during which pressure is applied to compress the chest and decompression phases during which approximately zero pressure is applied to the chest a ventilator configured to deliver positive, negative, or approximately zero pressure to the airway; control circuitry and processor, wherein the circuitry and processor are configured to cause the chest compressing device to repeatedly deliver a set containing a plurality of systolic flow cycles, each systolic flow cycle comprising a systolic decompression phase and a systolic compression phase, and at least one diastolic flow cycle interspersed between sets of systolic flow cycles, each diastolic flow cycle comprising a diastolic decompression phase and a diastolic compression phase, wherein the diastolic decompression phase is substantially longer than the systolic decompression phase.

Claims

1. Apparatus for automatic delivery of chest compressions and ventilation to a patient, the apparatus comprising:

a chest compressing device configured to deliver compression phases during which pressure is applied to compress the chest and decompression phases during which approximately zero pressure is applied to the chest;

a ventilator configured to deliver positive, negative, or approximately zero pressure to the airway;

control circuitry and processor, wherein the circuitry and processor are configured to cause the chest compressing device to repeatedly deliver systolic flow cycles, each systolic flow cycle comprising a systolic decompression phase and a systolic compression phase and being configured to improve systolic circulatory flow, and

wherein the control circuitry and processor are configured to cause the ventilator to deliver a ventilation pressure during the systolic compression phase that increases in the shape of a ramp over the duration of the systolic compression phase from approximately zero pressure at the onset of the systolic compression phase to approximately a maximum pressure at or near the end of the compression phase, and transitions to a negative minimum pressure at or near the start of the decompression phase, and then increases in the shape of a ramp over the duration of the systolic decompression phase to approximately zero pressure at the end of the decompression phase.

2. The apparatus of claim 1 further comprising cooling apparatus for cooling gases delivered by the ventilator, wherein the cooling is configured to cool the lungs, heart and the pulmonary blood flow.

3. The apparatus of claim 1 wherein the slope of the ramp shape during the decompression phase is approximately the same as the slope during the compression phase.