Intermittent oxygen delivery system and cannula

• US 5,099,836 A
• Filed: 01/17/1990
• Issued: 03/31/1992
• Est. Priority Date: 10/05/1987
• Status: Expired due to Term

• Current Assignee: Technology Holding Company II (Teleflex Incorporated)
• Original Assignee: Hudson Respiratory Care, Inc. (Teleflex Incorporated)
• Inventors: Rowland, Robert O., Loescher, Thomas C.
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Lacyk, J. P.
• Application Number:
  US07/467,308
• Time in Patent Office: 804 Days
• Field of Search: 128/204.18, 128/204.21, 128/204.22, 128/204.23, 128/204.26, 128/206.18, 128/207.13, 128/207.18
• US Class Current: 128/204.23
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/0666 Nasal cannulas or tubing devices for improving normal breathing through the nose A61F5/08; nose filters A62B23/06; outside holding devices A61M25/02
• CPC Class Codes: A61M 16/0677 Gas-saving devices therefor
• CPC Class Codes: A61M 16/0858 Pressure sampling ports
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0027 pressure meter

Abstract

An improved system for delivering oxygen on demand to a user comprises a pressure transducer for sensing pressures during the breathing cycle of a user and for creating an electrical signal proportional to said sensed pressures, an electronic amplifier for amplifying the signal to at least 10,000 times the original signal strength, electronic filters for regulating the amplitude of the signal and for correcting the point of the signal where expiration stops and inspiration begins to correspond to zero respiratory pressure, an on/off switching circuit and cooperating valve drive circuit for switching to an on condition in response to a preselected first pressure and to an off condition in response to a preselected second pressure, and a valve driven by the valve drive circuit means for directing oxygen from an oxygen source to a user.

Claims

1. A nasal cannula comprising:

an elongated hollow tubular cannula body having a single port at each opposite end thereof, each port for being attached to or receiving a single tube, respectively, and

a single pair of nasal tubes integral with and extending from said cannula body, each of said nasal tubes having a first port at an end thereof and a second port on an exterior sidewall thereof, and an internal divider wall extending across the interior of each of said nasal tubes and defining a first passageway extending between the hollow cannula body and said first port and a second passageway extending between said first port and said second port.

2. A nasal cannula comprising:

an elongated tubular cannula body having a gas supply port at a first end thereof and a pressure sensing port at a second end thereof,

a pair of nasal tubes extending from said cannula body and having an outlet port at the end thereof opposite said cannula body, and

a wall member secured in said cannula body and forming a first and a second chamber therein, said wall member extending into each nasal tube to form a first and a second passageway therein, wherein said first chamber is in communication with said first passageway and said second chamber is in communication with said second passageway.