Portable pressure transducer, pneumotach for use therewith, and associated methods

• US 7,654,146 B2
• Filed: 02/12/2007
• Issued: 02/02/2010
• Est. Priority Date: 05/07/2001
• Status: Expired due to Term

• Current Assignee: RIC INVESTMENTS LLC (Respironics Incorporated)
• Original Assignee: RIC INVESTMENTS LLC (Respironics Incorporated)
• Inventors: Kofoed, Scott A., Durst, Kevin, Orr, Joseph A.
• Primary Examiner(s): Caputo; Lisa M
• Assistant Examiner(s): JENKINS, JERMAINE L
• Application Number:
  US11/705,561
• Publication Number:
  US 20070261498A1
• Time in Patent Office: 1,086 Days
• Field of Search: 73700-756
• US Class Current: 73/700
• CPC Class Codes: A61B 5/087 Measuring breath flow
• CPC Class Codes: G01L 13/00 Devices or apparatus for measuring differences of two or more fluid pressure values

Abstract

A system for sensing respiratory pressure includes a portable pressure transducer configured to be carried by or proximate to a respiratory conduit, such as a breathing circuit or a nasal canula. The portable pressure transducer may removably couple with a pneumotach, in the form of an airway adapter, disposed along the respiratory conduit. The pneumotach may include two pressure ports positioned at opposite sides of an obstruction, which partially blocks flow through a primary conduit of the pneumotach. Corresponding sample conduits of the portable pressure transducer removably couple with the pressure ports. The pressure ports may have sealing elements which are configured to seal against piercing members of the sample conduits upon introduction of the piercing members therethrough. Upon removal of the piercing members, the sealing elements substantially reseal. Methods for using the system are also disclosed.

Claims

1. A method for monitoring a pressure of an individual'"'"'s respiration, comprising:

providing a respiratory conduit in fluid communication with an airway of an individual;

positioning an airway adapter at a location along the respiratory conduit, wherein the airway adapter includes a flow resisting portion adapted to create a pressure change across the flow resisting portion, wherein the airway adapter comprises a housing having a first end, a second end, and a gas flow passage defined between the first end and the second end, and wherein positioning the airway adapter along the respiratory conduit includes attaching a first portion of the respiratory conduit to the first end and attaching a second portion of the respiratory conduit to the second end;

providing a transducer comprising a housing and a pressure sensing system contained in the housing;

assembling the transducer on the airway adapter; and

measuring and outputting a signal indicative of the pressure change across the flow resisting portion via the pressure sensing system wherein the pressure sensing system measures the pressure change across the flow resisting portion by monotoring a mechanical displacement of a component of a differential pressure sensor having at least one side in fluid communication with the gas flow passage.

2. The method of claim 1, further comprising communicating the signal to a remote monitor via a hardwired or wireless communication between the pressure sensing system and a processor in the remote monitor.

3. The system of claim 1, further comprising calculating a respiratory pressure parameter, a respiratory flow parameter, a respiratory volume parameter, a respiratory gas parameter, a blood gas parameter, a blood flow parameter, or any combination thereof based at least partially on the signal.

4. The method of claim 1, further comprising:

coupling a gas monitoring system to the airway adapter; and

monitoring at least one constituent of gas passing through the airway adapter via the gas monitoring system.

5. The method of claim 1, wherein assembling the respiratory measurement transducer on the airway adapter includes providing fluid communications between a first side and a second side of the flow resisting portion and the pressure sensing system to measure the pressure change across the flow resisting portion.

6. The method of claim 1, wherein the pressure sensing system measures the pressure change across the flow resisting portion by monitoring a mechanical displacement of a component of a differential pressure sensor having at least one side in fluid communication with the gas flow passage.

7. A method for monitoring a pressure of an individual'"'"'s respiration, comprising:

providing a respiratory conduit in fluid communication with an airway of an individual;

positioning an airway adapter at a location along the respiratory conduit, wherein the airway adapter includes a flow resisting portion adapted to create a pressure change across the flow resisting portion;

providing a transducer comprising a housing and a pressure sensing system contained in the housing;

assembling the respiratory measurement transducer on the airway adapter; and

measuring and outputting a signal indicative of the pressure change across the flow resisting portion via the pressure sensing system, wherein assembling the respiratory measurement transducer on the airway adapter includes providing fluid communications between a first side and a second side of the flow resisting portion and the pressure sensing system to measure the pressure change across the flow resisting portion, wherein the airway adapter includes a first pressure port in fluid communication with a first side of the flow resisting portion, and a second pressure port in fluid communication with a second side of the flow resisting portion, and wherein assembling the transducer on the airway adapter includes piercing a protecting covering provided over the first pressure port, the second pressure port, or both.

8. The method of claim 7, further comprising communicating the signal to a remote monitor via a hardwired or wireless communication between the pressure sensing system and a processor in the remote monitor.

9. The method of claim 7, further comprising calculating respiratory pressure parameter, a respiratory flow parameter, a respiratory volume parameter, a respiratory gas parameter, a blood gas parameter, a blood flow parameter, or any combination thereof based at least partially on the signal.

10. The method of claim 7, wherein the transducer includes a first pressure port in fluid communication with the pressure sensing system, and a second pressure port in fluid communication with the pressure sensing system, and wherein assembling the transducer on the airway adapter includes piercing a protective covering provided over the first pressure port, the second pressure port, or both.

11. The method of claim 10, wherein the airway adapter includes a first external structure having a first configuration, wherein the housing of the transducer includes a second structure having a second configuration adapted for mating engagement with the first structure, and wherein assembling the transducer on the airway adapter includes engaging the first structure with the second structure.

12. The method of claim 7, wherein the airway adapter comprises a housing having a first end, a second end, and a gas flow passage defined between the first end and the second end, and wherein positioning an airway adapter at a location along the respiratory conduit includes attaching a first portion of the respiratory conduit to the first end and attaching a second portion of the respiratory conduit to the second end.

13. The method of claim 7, further comprising:

coupling a gas monitoring system to the airway adapter; and

monitoring at least one constituent of gas passing through the airway adapter via the gas monitoring system.

14. The method of claim 7, wherein the pressure sensing system measures the pressure change across the flow resisting portion by monitoring a mechanical displacement of a component of a differential pressure sensor having at least one side in fluid communication with a gas flow passage in the airway adapter.

15. A method for monitoring a pressure of an individual'"'"'s respiration, comprising:

providing a respiratory conduit in fluid communication with an airway of an individual;

positioning an airway adapter at a location along the respiratory conduit, wherein the airway adapter includes a flow resisting portion adapted to create a pressure change across the flow resisting portion, wherein the airway adapter comprises a housing having a first end, a second end, and a gas flow passage defined between the first end and the second end, and wherein positioning the airway adapter along the respiratory conduit includes attaching a first portion of the respiratory conduit to the first end and attaching a second portion of the respiratory conduit to the second end;

providing a transducer comprising a housing and a pressure sensing system contained in the housing;

assembling the transducer on the airway adapter; and

measuring and outputting a signal indicative of the pressure change across the flow resisting portion via the pressure sensing system, wherein the airway adapter includes a first pressure port in fluid communication with a first side of the flow resisting portion, and a second pressure port in fluid communication with a second side of the flow resisting portion, and wherein assembling the respiratory measurement transducer on the airway adapter includes piercing a protective covering provided over the first pressure port, the second pressure port, or both.

16. A method for monitoring a pressure of an individual'"'"'s respiration, comprising:

providing a respiratory conduit in fluid communication with an airway of an individual;

positioning an airway adapter at a location along the respiratory conduit, wherein the airway adapter includes a flow resisting portion adapted to create a pressure change across the flow resisting portion, wherein the airway adapter comprises a housing having a first end, a second end, and a gas flow passage defined between the first end and the second end, and wherein positioning the airway adapter along the respiratory conduit includes attaching a first portion of the respiratory conduit to the first end and attaching a second portion of the respiratory conduit to the second end;

providing a transducer comprising a housing and a pressure sensing system contained in the housing;

assembling the transducer on the airway adapter; and

measuring and outputting a signal indicative of the pressure change across the flow resisting portion via the pressure sensing system, wherein the transducer includes a first pressure port in fluid communication with the pressure sensing system, and a second pressure port in fluid communication with the pressure sensing system, and wherein assembling the transducer on the airway adapter includes piercing a protective covering provided over the first pressure port, the second pressure port, or both.