System and method of testing a person in the performance of cardiopulmonary resuscitation

• US 4,797,104 A
• Filed: 08/03/1987
• Issued: 01/10/1989
• Est. Priority Date: 11/08/1986
• Status: Expired due to Term

• Current Assignee: Asmund S. Laerdal
• Original Assignee: Asmund S. Laerdal
• Inventors: Aamodth, Kjell, Laerdal, Tore, Eikeland, Harald
• Primary Examiner(s): Davis, Jr., Albert W.
• Application Number:
  US07/081,317
• Time in Patent Office: 526 Days
• Field of Search: 434/262, 434/265, 434/307, 434/323, 434/428, 128/695
• US Class Current: 434/265
• CPC Class Codes: A61H 2201/5043 Displays
• CPC Class Codes: A61H 31/005 with feedback for the user
• CPC Class Codes: G09B 23/288 for artificial respiration or heart massage

Abstract

In a system and a method of testing a person in the performance of cardiopulmonary resuscitation and for evaluating training exercises therein, a training device simulating a patient includes sensors for detecting various resuscitation procedures performed thereon. Parameter signals from the sensors are fed to a computer including a series of counters, a timing means and various memories, for analyzing the parameter signals and assessing whether the corresponding operations have been correctly or incorrectly performed. The values processed by the computer are then displayed on a display providing a clear moving representation of the procedures performed on the training device, the representation taking place in real time on the basis of corresponding signals from the timing means, whereby, by viewing the display, the trainee operator can directly check and if appropriate correct the resuscitation procedures he is performing. The display can display the whole of the cardiopulmonary resuscitation operation including preparatory procedures.

Claims

1. A system for testing a person in the performance of cardiopulmonary resuscitation (CPR) and for evaluating the correctness of a training exercise in CPR, including:

(a) a training device which simulates a patient, comprising at least one sensor for the output of parameter signals defining characteristic parameters for a resuscitation procedure to be carried out on the training device;

(b) a memory means for storing parameter values which define

(i) a parameter minimum value for the recognition of an operating procedure on the training device, as an attempt at a resuscitation procedure, and

(ii) upper and lower parameter limit values for the recognition of an operating procedure on the training device as a correct resuscitation procedure;

(c) a computer connected to the training device and the memory means for receiving the parameter signals from said at least one sensor, the computer being adapted to compare the parameter signals from the said at least one sensor to respective stored parameter values in the memory means thereby to detect the character of a resuscitation procedure in respect of correctness thereof, and

(d) a liquid crystal display means controlled by the computer for displaying a symbolic representation of the training device and a moving graphic representation of the parameter signals from said at least one sensor.

2. A system as set forth in claim 1 wherein said display means additionally displays the ratio between the number of correct resuscitation procedures and the number of attempts at resuscitation procedures.

3. A system as set forth in claim 1 wherein said display means additionally displays symbols representing incorrect resuscitation procedures, which symbols are actuable by way of the computer by parameter signals from said at least one sensor in response to incorrect resuscitation procedures.

4. A system as set forth in claim 1 and including a further memory means for storing parameter values defining a series of preparatory procedures, and further sensors on said training device responsive to said preparatory procedures, wherein said display means is adapted to display symbols corresponding to the performance of said preparatory procedures and respectively activatable by parameter signals from said further sensors.

5. A system as set forth in claim 1 and further including a time measuring means for measuring the beginning, end and duration of said parameter signals, and wherein at least the spacing in respect of time of said parameter signals is adapted to be displayed on said display means.

6. A system for testing a person in the performance of CPR and for evaluating the correctness of a training exercise in CPR, including:

(a) a training device for simulating a patient, having a simulation of a neck region, a chest region, air passages and a lung of a person, and including a plurality of sensors for the output of parameter signals comprising a first sensor responsive to shaking of the training device and adapted to output a consciousness signal when shaking occurs, a second sensor at the neck region responsive to feeling with the fingers of the person being tested and adapted to output a pulse signal when felt with a predetermined contact pressure, a third sensor at the air passages responsive to an open condition of the air passages and adapted to output an air passage open signal corresponding to said open condition, a fourth sensor at the chest region responsive to compression of the chest and adapted to output a compression signal when the chest region is compressed, a fifth sensor operatively associated with the lung and responsive to inflation of the lung and adapted to output a respiration signal when the lung is inflated, and a sixth sensor at the chest region responsive to the laying thereon of a hand of the person being tested and adapted to output a hand contact signal when the hand is laid on the chest;

(b) a memory means for storing parameter values which define

(i) a respective parameter minimum value in respect of recognition of operating procedures on the training device as attempts at shaking the training device, feeling the neck region, putting the air passages into the open condition, compressing the chest region and a respiration movement of the lung, and

(ii) upper and lower parameter limit values for recognition of said procedures on the training device, as correct resuscitation procedures;

(c) a computer connected to the training device and the memory means for receiving the parameter signals from said sensors and adapted to compare said parameter signals from said sensors to the respective stored parameter values in said memory means and thereby to establish the nature of a resuscitation procedure in terms of correctness;

(d) a time measuring means actuable by the respective parameter signals of the sensors and adapted to measure the period of time elapsing after the first response of the first through fifth sensors respectively, and

(e) a display means controlled by the computer and the time measuring means and adapted to display in relation to a time axis in real time mode a graphic representation of the parameter signals of the first through fifth sensors.

7. A system as set forth in claim 6 wherein the display means additionally displays the ratio between the number of correct resuscitation procedures and the number of attempts at resuscitation procedures.

8. A system as set forth in claim 6 wherein said display means additionally displays symbols representing incorrect resuscitation procedures, which symbols are actuable by way of the computer by parameter signals from said respective sensor in response to incorrect resuscitation procedures.

9. A system as set forth in claim 6 and including a further memory means for storing parameter values defining a series of preparatory procedures, and further sensors on said training device responsive to said preparatory procedures, wherein said display means is adapted to display symbols corresponding to the performance of said preparatory procedures and respectively activatable by parameter signals from said further sensors.

10. A system as set forth in claim 6 and further including a time measuring means for measuring the beginning, end and duration of said parameter signals, and wherein at least the spacing in respect of time of said parameter signals is adapted to be displayed on said display means.

11. A system as set forth in claim 6 wherein the display means is also adapted to display a symbolic representation of the training device and an analog representation of the parameter signals of the fourth and fifth sensors.

12. A system as set forth in claim 6 wherein said sixth sensor comprises a plurality of sensor units including a first group arranged in a part of the chest region in which hand contact is correct and a second group arranged outside said part of the chest region, said sixth sensor being operable to supply a hand contact signal which signals correct hand contact only when no sensor unit of said second group is activated.

13. A system as set forth in claim 12 wherein said sensor units of said second group are divided into four sub-groups which are each associated with a respective 90°

sector outside said part of the chest region in which said hand contact is correct.

14. A system as set forth in claim 13 wherein a hand contact signal can be blended into said symbolic representation of said training device on said display means, in accordance with a response by at least one said sensor unit of one of said four sub-groups at a corresponding location of said symbolic representation, as a marking means.

15. A method of testing a person in the performance of CPR and evaluating the resuscitation procedure performed by that person, using a computer, a display means and a training device which simulates a patient, and in which there is provided at least one sensor for detecting a resuscitation procedure carried out on the training device, the computer, display means and training device being coupled together, comprising the following steps:

(a) storage of parameter values which define

(i) a parameter minimum value for the recognition of an operating procedure on the training device, as an attempt at a resuscitation procedure, and

(ii) upper and lower parameter limit values for the recognition of an operating procedure on the training device as a correct resuscitation procedure;

(b) the performance of a resuscitation procedure by the person being tested on the training device and the production of parameter signals by said at least one sensor;

(c) recognition by the computer of an attempt at a resuscitation procedure and a correct resuscitation operating procedure by comparison of said parameter signal from said at least one sensor with said stored parameter values; and

(d) production of a symbolic representation of the training device and an analog moving graphic representation of the parameter signals on said display means.