CPR assist device with pressure bladder feedback

• US 6,616,620 B2
• Filed: 05/25/2001
• Issued: 09/09/2003
• Est. Priority Date: 05/25/2001
• Status: Expired due to Term

• Current Assignee: Zoll Circulation Incorporated (Asahi Kasei Corporation)
• Original Assignee: Revivant Corporation (Asahi Kasei Corporation)
• Inventors: Mollenauer, Kenneth H., Sherman, Darren R.
• Primary Examiner(s): DeMille, Danton D.
• Application Number:
  US09/866,377
• Publication Number:
  US 20020177793A1
• Time in Patent Office: 837 Days
• Field of Search: 601/41-44, 601/148-152, 601/143, 601/144, 128/DIG.20
• US Class Current: 601/41
• CPC Class Codes: A61H 2011/005 with belt or strap expanding and contracting around an encircled body part
• CPC Class Codes: A61H 2031/003 with alternated thorax decompression due to lateral compression
• CPC Class Codes: A61H 2201/0103 inflatable
• CPC Class Codes: A61H 2201/0176 By stopping operation
• CPC Class Codes: A61H 2201/018 By limiting the applied torque or force
• 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 2201/5012 using the internet
• CPC Class Codes: A61H 2201/5043 Displays
• CPC Class Codes: A61H 2201/5058 Sensors or detectors
• CPC Class Codes: A61H 2201/5061 Force sensors
• CPC Class Codes: A61H 2201/5064 Position sensors
• CPC Class Codes: A61H 2201/5071 Pressure sensors
• CPC Class Codes: A61H 2201/5089 Gas sensors, e.g. for oxygen or CO2
• 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 2230/207 partial O2-value
• CPC Class Codes: A61H 2230/30 Blood pressure A61H2230/04 takes precedence
• 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 31/008 : Supine patient supports or bases, e.g. improving air-way access to the lungs
• 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 16/10 : Preparation of respiratory gases or vapours
• CPC Class Codes: A61M 2205/3546 : Range
• CPC Class Codes: A61M 2230/432 : partial CO2 pressure (P-CO2)
• CPC Class Codes: A61N 1/046 : Specially adapted for shock therapy, e.g. defibrillation
• CPC Class Codes: A61N 1/0472 : Structure-related aspects
• CPC Class Codes: A61N 1/0492 : Patch electrodes A61N1/0412, A61N1/0428 take precedence
• CPC Class Codes: A61N 1/39044 : in combination with cardiopulmonary resuscitation [CPR] therapy
• CPC Class Codes: A61N 1/3968 : Constructional arrangements, e.g. casings A61N1/375 takes precedence
• CPC Class Codes: Y10S 601/06 : Artificial respiration conforming to shape of torso
• CPC Class Codes: Y10S 601/08 : Artificial respiration with computer control

Abstract

A resuscitation device for automatic compression of a victim'"'"'s chest using a compression belt which exerts force evenly over the entire thoracic cavity. The belt is constricted and relaxed through a motorized spool assembly that repeatedly tightens the belt and relaxes the belt to provide repeated and rapid chest compression.

Claims

1. A device for compressing the chest of a patient comprising:

a belt adapted to extend around the chest of the patient and fastened on the patient;

a drive spool operably connected to the belt for repeatedly tightening and loosening the belt around the chest of the patient;

a motor operably connected to the drive spool through a drive train, said motor capable of operating the drive spool repeatedly to cause the belt to tighten about the chest of the patient and loosen about the chest of the patient;

said drive train comprising a motor shaft, a gearbox with a gearbox output shaft, a first sprocket wheel mounted on the gearbox output shaft, said first sprocket wheel being connected to a second sprocket wheel mounted on the drive spool through a first chain;

a brake having a brake shaft, and a third sprocket wheel mounted therein, said third sprocket wheel being connected to a fourth sprocket wheel through a second chain, said fourth sprocket wheel being connected to the drive spool; and

a controller for controlling operation of the motor and brake, said controller programmed to operate the motor and brake to cause repeated cycles of tightening and loosening of the belt, and intermittently operating the brake to hold the belt at a threshold of tightness.

2. The device of claim 1 wherein the third sprocket wheel and fourth sprocket wheel are sized relative to each other to effect a gearing change which increases the speed of the brake shaft relative to the drive spool.

3. The device of claim 2 where the first sprocket wheel and second sprocket wheel are sized relative to each other to effect a gearing change which decreases the speed of the drive spool relative to the gearbox output shaft.

4. A device for compressing the chest of a patient comprising:

a belt adapted to extend at least partially around the chest of the patient;

a drive spool operably connected to the belt for repeatedly tightening and loosening the belt around the chest of the patient;

a brake having a brake shaft, said brake operably connected to the drive spool and capable of holding the drive spool in a tightened state about the chest of the patient;

a motor operably connected to the drive spool through a drive train, said motor capable of operating the drive spool repeatedly to cause the belt to tighten about the chest of the patient and loosen about the chest of the patient;

said drive train comprising a motor shaft, a gearbox with a gearbox output shaft, a first sprocket wheel mounted on the gearbox output shaft and a second sprocket wheel mounted on the gearbox output shaft;

said brake being connected to the first sprocket wheel through a first chain, said first chain connected to a third sprocket wheel which is connected to the brake shaft;

said drive spool being connected to the second sprocket wheel through a second chain, said second chain connected to a fourth sprocket wheel which is connected to the drive spool;

a controller for controlling operation of the motor and brake, said controller programmed to operate the motor and brake to cause repeated cycles of tightening and loosening of the belt, and intermittently operating the brake to hold the belt at a threshold of tightness.

5. The device of claim 4 wherein the first sprocket wheel and third sprocket wheel are sized relative to each other to effect a gearing change which increases the speed of the brake shaft relative to the gearbox output shaft.

6. The device of claim 5 where the second sprocket wheel and fourth sprocket wheel are sized relative to each other to effect a gearing change which decreases the speed of the drive spool relative to the gearbox output shaft.