REBREATHER OXYGEN RISK ALARM

• US 20100052922A1
• Filed: 05/28/2009
• Published: 03/04/2010
• Est. Priority Date: 05/28/2008
• Status: Abandoned Application

• Current Assignee: Alexander Roger Deas
• Original Assignee: Alexander Roger Deas
• Inventors: Deas, Alexander Roger
• Application Number:
  US12/473,597
• Publication Number:
  US 20100052922A1
• Time in Patent Office: Days
• US Class Current: 340/632
• CPC Class Codes: B63C 11/24 in closed circulation

Abstract

A device that indicates a hypoxia risk or hyperoxia risk, or analogue thereto, using an integral value that is reset when a user activates a switch and which integrates over time from each reset event as a function calculating the PPO2 deviation from parameters that include ambient pressure changes or derivatives thereof and physiological parameters or analogues thereof, from which a metabolic parameter is calculated.

Claims

1. An oxygen risk monitor, comprising

a PPO2 deviation calculator to calculate deviation of a PPO2 value from a PPO2 set point, for gas passing through a breathing loop;

and

a reset switch, which is user activatable and which comprises an integrator to integrate over time a function of ambient pressure changes and predefined metabolic parameters.

2. The oxygen risk monitor according to claim 1 where the integrator further integrates a parameter related to oxygen flow rate.

3. The oxygen risk monitor according to claim 1 where the integrator is used to activate an alarm by comparison with at least one of a fixed limit and a depth-related limit.

4. The oxygen risk monitor according to claim 1 further comprising a safety limit and a safety indicator display showing a parameter that is a function of a number of times the oxygen risk monitor has tripped its safety limit.

5. The oxygen risk monitor according to claim 1 wherein the metabolic parameters are adjusted to a user based on input of the user'"'"'s weight, height, age and sex.

6. The oxygen risk monitor according to claim 1 wherein a volume in a breathing loop is adjusted for the user based on input of the user'"'"'s weight, height, age and sex.

7. The oxygen risk monitor according to claim 1 which annunciates a warning, by use of one or more warning signals, when the PPO2 value may change as a result of metabolic rate and depth changes, at a smaller PPO2 variation than for a full alarm.

8. The oxygen risk monitor according to claim 3 wherein the alarm is preceded by activation of a vibrator in one of a dive mask, a dive helmet and a mouthpiece, to break the user'"'"'s attention so that the user notices the primary alarm signal.

9. The oxygen risk monitor according to claim 7 wherein the warning signals are given by one of a light and a light pattern emitting from a peripheral field display.

10. The oxygen risk monitor according to claim 7 where the warning signals comprise an automatic voice annunciation system fitted to one of the mouthpiece, the dive mask and the helmet.

11. The oxygen risk monitor according to claim 1 that is integrated with a PPO2 monitor or display such that the switch to reset the interval timer is the same switch that activates the display.

12. The oxygen risk monitor according to claim 1, further comprising a flow measurement sensor to measure an addition of gas to the breathing loop.

13. The oxygen risk monitor of claim 1, wherein the oxygen risk monitor is configured to monitor at least one of a hypoxia condition and a hyperoxia condition.

14. The oxygen risk monitor according to claim 1 wherein the metabolic parameters are adjusted to a user based on input of current flow conditions experienced by a user.

15. The oxygen risk monitor according to claim 1, further comprising a programmed device configured to adjust the metabolic parameters, wherein the programmed device is isolated from the circuit that measures and displays the PPO2, except for a shared reset switch.

16. The oxygen risk monitor according to claim 1, further comprising a programmed device configured to adjust the metabolic parameters, wherein the programmed device is isolated from the circuit that measures and displays the PPO2, except for a shared reset switch.

17. The oxygen risk monitor according to claim 1, further comprising a flow sensor to reduce a reduction in loop PPO2 deviation from metabolism when there is gas flowing in the breathing loop from an oxygen dosing device.

18. The oxygen risk monitor according to claim 1, further comprising a flow sensor to account for oxygen added to the loop when gas is flowing in the breathing loop from an oxygen dosing device.

19. The oxygen risk monitor according to claim 1, wherein the oxygen risk monitor switches itself on when water is detected using wet contacts.

20. The oxygen risk monitor according to claim 1, wherein the oxygen risk monitor is configured to count a number of failures by the user to observe a warning or an alarm.