Resuscitator regulator with carbon dioxide detector

• US 6,123,075 A
• Filed: 10/03/1996
• Issued: 09/26/2000
• Est. Priority Date: 10/15/1991
• Status: Expired due to Fees

• Current Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Original Assignee: Mallinckrodt Incorporated (Mallinckrodt plc)
• Inventors: Kirk, Gilbert M.
• Primary Examiner(s): Lewis, Aaron J.
• Application Number:
  US08/725,153
• Time in Patent Office: 1,454 Days
• Field of Search: 128/200.24, 128/202.22, 128/204.198, 128/205.13, 128/205.23, 128/205.25, 128/205.28, 128/201.28, 128/202.27-203.11 , 128/203.28, 128/203.29, 128/205.17, 128/205.24, 128/206.12, 128/206.15, 128/207.12, 128/207.16, 128/719, 137/908, 73/864.63, 73/23.3, 73/23.42
• US Class Current: 128/205.13
• CPC Class Codes: A61M 16/0078 Breathing bags
• CPC Class Codes: A61M 16/0084 self-reinflatable by elasticity, e.g. resuscitation squeeze bags
• CPC Class Codes: A61M 16/0816 Joints or connectors
• CPC Class Codes: A61M 16/1065 in the expiratory path
• CPC Class Codes: A61M 16/12 by mixing different gases
• CPC Class Codes: A61M 16/22 Carbon dioxide-absorbing devices ; Other means for removing carbon dioxidecartridges with absorbing substances for respiratory apparatus A62B19/00
• CPC Class Codes: A61M 2016/0413 with detectors of CO2 in exhaled gases
• CPC Class Codes: A61M 2205/7536 allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes
• CPC Class Codes: A61M 2230/432 partial CO2 pressure (P-CO2)

Abstract

A resuscitator is provided with an integral carbon dioxide detector for indicating the presence of carbon dioxide in a patient. The carbon dioxide detector is a conventional pH sensitive chromogenic compound that is positioned in the breathing circuit to permit a rapid indication.

Claims

1. A resuscitation device with an integral carbon dioxide detector assembly, comprising:

a flexible bag having an inlet and an outlet;

a one way valve coupled to the flexible bag outlet;

a frame having generally vertical sides and positioned over the one way valve;

an indicator strip surrounding the generally vertical sides of the frame;

an inhalation port for passing fresh gas flow, the inhalation port positioned such that the fresh gas flow passes through the indicator element thereby cleansing the indicator element; and

an exhalation port positioned such that exhaled gas flow passes through the indicator strip thereby causing a chemical reaction in the indicator strip in response to carbon dioxide present in the exhaled gas flow.

2. The device of claim 1, further comprising:

a viewing window for visually detecting the chemical reaction in the indicator strip.

3. The device of claim 1, further comprising:

a filter for trapping foreign matter in an exhaled gas flow.

4. The device of claim 1, further comprising:

a housing, the housing containing the inhalation port and exhalation port, the housing further containing the one way valve, the frame, and the indicator strip.

5. The device of claim 1, wherein the exhalation port includes a one way valve.

6. The device of claim 1, further comprising:

a cap for sealing the inhalation port to prevent the indicator strip from excessive exposure to carbon dioxide when the resuscitation device is not in use.

7. A regulator for use with a breathing apparatus, comprising:

an airtight housing including an inlet for providing fresh gas flow to the regulator, an inhalation port for passing fresh gas flow, and an exhalation port for passing stale gas flow;

an indicator assembly within the air tight housing including;

a one way valve adjacent to the inlet;

a frame having generally vertical sides over the one way valve;

an indicator strip surrounding the generally vertical sides of the frame, the indicator strip changing color in response to a carbon dioxide concentration level in excess of an atmospheric carbon dioxide concentration level; and

wherein the airtight housing and indicator assembly minimize a stale air space in the regulator and locate the indicator assembly in a breathing circuit of the regulator.

8. The regulator of claim 7, wherein the exhalation port includes a one way valve.

9. The regulator of claim 7, further comprising:

a window for visually detecting a change in color of the indicator strip.

10. The regulator of claim 7, further comprising:

a sealing unit for providing an airtight seal for the inhalation port thereby minimizing exposure of the indicator assembly to carbon dioxide when the regulator is not in use.

11. The regulator of claim 7, further comprising an absorber coupled to the sealing unit for absorbing any carbon dioxide existing within the airtight housing after the sealing unit is attached to the inhalation port.

12. The regulator of claim 7, wherein the indicator assembly is positioned within the exhalation port.

13. A resuscitation device, comprising:

a flexible bag for providing fresh gas flow;

an airtight regulator housing having an inlet coupled to the flexible bag, an inhalation port for passing fresh gas flow, and an exhalation port for passing stale gas flow;

an integral indicator assembly located within the airtight housing, the integral indicator assembly further located between the inhalation port and the exhalation port, the integral indicator assembly including;

a one way valve adjacent to the inlet;

an indicator strip surrounding the one way valve; and

wherein the integral indicator assembly minimizes a stale airspace within the airtight regulator housing.

14. The device of claim 13, wherein the integral indicator assembly further comprises a frame positioned over the one way valve, the frame providing support for the indicator strip.

15. The device of claim 14, further comprising a filter cap on top of the frame, the filter cap preventing liquid and solid materials from fouling the indicator strip.

16. The device of claim 13, wherein the airtight regulator housing includes a window for viewing the indicator strip.

17. The device of claim 13, wherein the exhalation port includes a one way valve.

18. The regulator of claim 13, further comprising:

a sealing unit for providing an airtight seal for the inhalation port thereby minimizing exposure of the indicator assembly to carbon dioxide when the regulator is not in use.

19. The regulator of claim 18, further comprising an absorber coupled to the sealing unit for absorbing any carbon dioxide existing within the airtight housing after the sealing unit is attached to the inhalation port.

20. The regulator of claim 13, wherein the indicator assembly is positioned within the exhalation port.

21. The device of claim 13, wherein the integral indicator assembly is located within a breathing circuit of the resuscitation device.

22. A method of detecting carbon dioxide in exhaled gases, comprising:

providing a flexible bag having an inlet and an outlet;

providing a one way valve coupled to the flexible bag outlet;

providing a frame having generally vertical sides and positioned over the one way valve;

providing an indicator strip surrounding the generally vertical sides of the frame;

providing an inhalation port for passing fresh gas flow, the inhalation port positioned such that the fresh gas flow passes through the indicator strip thereby cleansing the indicator strip;

providing an exhalation port positioned such that exhaled gas flow passes through the indicator strip thereby causing a chemical reaction in the indicator strip in response to carbon dioxide present in the exhaled gas flow;

supplying fresh gas through the inhalation port;

collecting exhaled gas from a patient;

directing the exhaled gas to the exhalation port;

exposing the indicator strip to the exhaled gas while the exhaled gas is enroute to the exhalation port, the distance between the inhalation port and the exhalation portion minimized in order to reduce a volume of stale air in the regulator, the exhaled gas causing a chemical reaction in the indicator strip in response to carbon dioxide being present in the exhaled gas;

exhausting the exhaled gas through the exhalation port; and

determining the respiratory status of the patient by viewing a color of the indicator strip.