Valve for use with inhalation/exhalation respiratory phase detection circuit

• US 5,630,411 A
• Filed: 09/18/1995
• Issued: 05/20/1997
• Est. Priority Date: 01/12/1993
• Status: Expired due to Term

• Current Assignee: Nellcor Puritan Bennett LLC (Medtronic Plc)
• Original Assignee: Nellcor Puritan Bennett Incorporated (Medtronic Plc)
• Inventors: Holscher, Russell L.
• Primary Examiner(s): Lewis, Aaron J.
• Application Number:
  US08/529,670
• Time in Patent Office: 610 Days
• Field of Search: 128/204.18, 128/204.21, 128/204.23, 128/205.24, 137/862, 137/863
• US Class Current: 128/205.24
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/0677 Gas-saving devices therefor
• CPC Class Codes: A61M 16/20 Valves specially adapted to medical respiratory devices
• CPC Class Codes: A61M 16/204 used for inhalation control
• CPC Class Codes: A61M 16/205 used for exhalation control
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: H03K 5/088 modified by switching, e.g. by a periodic signal or by a signal in synchronism with the transitions of the output signal

Abstract

An apparatus for controlling the pressure of a respiratory gas delivered to a patient includes a phase detection circuit for determining the inhalation and exhalation phases of a patient'"'"'s respiratory cycle. More particularly, a valving apparatus for controlling air flow within the breathing circuit which is connected to the phase detection circuit.

Claims

1. A valve for controlling air flow within a respiratory circuit, the valve comprising:

a valve base;

a valve element cover secured to said valve base, said valve element cover having an inlet tube configured to connect to a source of air and an outlet tube configured to be placed in fluid communication with an airway of a patient; and

a rotatable valve element, said rotatable valve element configured to rotate between a closed position, an open position and intermediate positions between the open and closed positions, said rotatable valve element and said valve base forming at least one exhaust port;

wherein said rotatable valve element blocks access from the inlet tube to both the outlet tube and the exhaust port and wherein the outlet tube is in fluid communication with the exhaust port when said rotatable valve element is configured in the closed position.

2. The valve of claim 1, wherein said rotatable valve element comprises a rotatable frusto-conically shaped hub, attached to a support ring, a plurality of pie-shaped support bodies located between said hub and said support ring, and a plurality of rectangularly shaped valve fingers spaced around the periphery of said hub and extending upwardly therefrom, said hub, support ring and support bodies defining said plurality of exhaust ports.

3. The valve of claim 2, wherein said plurality of support bodies are configured to gradually obstruct air flow through said at least one exhaust port, and said valve fingers are configured to gradually permit air flow through said outlet tube as said hub is rotated in relation to said valve base.

4. The valve of claim 2, wherein said hub is connected to a rotatable motor shaft, said motor shaft is controlled by a breath phase detection circuit to rotate said rotatable valve element in relation to breathing phases of a patient.

5. The valve of claim 2, in which said exhaust port is a recess substantially trapezoidal in shape to provide more precise control of gas.

6. A valve for controlling air flow within a respiratory circuit, the valve comprising:

a valve base having a plurality of recesses;

a valve cover secured to said valve base, said valve cover configured with an inlet tube, an outlet tube, and a plurality of first valve fingers extending away from the inlet tube; and

a valve element rotatably disposed on said valve base and rotatably disposed within said valve cover,

said valve element having a plurality of exhaust ports configured to register with the recesses of said valve base as the valve element is rotated,

said valve element further having a plurality of second valve fingers having spaces therebetween, wherein rotation of the valve element causes the second valve fingers or spaces to move into registration with the first valve fingers to open or close fluid communication from the inlet tube to the outlet tube and to the exhaust ports.