Directional valve

• US 6,536,433 B1
• Filed: 04/14/2000
• Issued: 03/25/2003
• Est. Priority Date: 04/27/1999
• Status: Expired due to Term

• Current Assignee: Maquet Critical Care AB (Getinge AB)
• Original Assignee: Siemens Elema AB
• Inventors: Cewers, Göran
• Primary Examiner(s): Lewis, Aaron J.
• Assistant Examiner(s): PATEL, MITAL B
• Application Number:
  US09/550,114
• Time in Patent Office: 1,075 Days
• Field of Search: 128/205.24, 128/204.18, 128/204.21, 128/204.23, 251/129.1
• US Class Current: 128/205.24
• 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: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2016/0042 in the expiratory circuit
• CPC Class Codes: F16K 31/0675 Electromagnet aspects, e.g. electric supply therefor
• CPC Class Codes: F16K 31/082 using a electromagnet and a permanent magnet

Abstract

A directional valve for respiratory devices has a valve body and a valve seat whose contact surface with the valve body is primarily horizontal. In order to enhance and reinforce the directional valve'"'"'s operation, the valve body contains a ferromagnetic material, preferably permanently magnetized, a coil is magnetically couplable to the valve body, a source of current is connected to the coil, and a control unit controls the source of current in order to regulate current through the coil to magnetically couple the coil to the valve body, in one or both of the closing and opening directions.

Claims

1. A directional valve for a respiratory device, said directional valve comprising:

a valve body containing ferromagnetic material;

a valve seat having a valve opening surrounded by a substantially horizontal contact surface on which said valve body loosely rests, said valve body being forced to move in an opening direction to open said valve opening exclusively by a fluid flow in one direction through said valve opening, and to move in a closing direction to close said valve opening exclusively due to said fluid flow ceasing or changing to a direction opposite said one direction;

at least one coil which is magnetically couplable to said valve body;

a current source connected to said coil; and

a control unit which regulates said current source to control a current through said coil to magnetically couple said coil to said valve body in at least one of said closing direction, to tightly close said valve opening, and said opening direction, to promote opening of said valve opening.

2. A directional valve as claimed in claim 1 wherein said control unit regulates said current through said coil to magnetically couple said coil to said valve body in each of said closing direction and said opening direction.

3. A directional valve as claimed in claim 1 wherein said ferromagnetic material is permanently magnetized.

4. A directional valve as claimed in claim 1 further comprising an inductive sensor which senses a position of said valve body, and wherein said control unit is connected to said inductive sensor and regulates said current source dependent on said position of said valve body.

5. A directional valve as claimed in claim 1 wherein movement of said valve body generates a voltage across said coil, and further comprising a sensor which senses said voltage due to said movement of said valve body, said control unit being connected to said sensor and regulating said current source dependent on said movement of said valve body.

6. A directional valve as claimed in claim 1 wherein deformation of said valve body generates a voltage across said coil, and further comprising a sensor which senses said voltage due to said deformation of said valve body, said control unit being connected to said sensor and regulating said current source dependent on said deformation of said valve body.

7. A directional valve as claimed in claim 1 further comprising an inductive sensor which measures a change in inductance in said coil caused by deformation of said valve body, and wherein said control unit is connected to said inductive sensor and regulates said current source dependent on said deformation of said valve body.

8. A directional valve as claimed in claim 1 wherein said valve seat has an inlet side and an outlet side, and further comprising a first pressure gauge which measures an inlet pressure at said inlet side and a second pressure gauge which measures an outlet pressure at said outlet side, and wherein said control unit is connected to said first pressure gauge and to said second pressure gauge and determines a pressure gradient between said inlet pressure and said outlet pressure, and wherein said control unit regulates said current source dependent on said pressure gradient.

9. A directional valve as claimed in claim 1 further comprising a flow meter which measures a flow through said valve opening, and wherein said control unit is connected to said flow meter and regulates said current source dependent on said flow.

10. A directional valve for a respiratory device, said directional valve comprising:

a valve body containing ferromagnetic material;

a valve seat having a valve opening surrounded by a substantially horizontal contact surface for said valve body, said valve body being disposed to move in a closing direction to close said valve opening and in an opening direction to open said valve opening;

a first coil which is magnetically couplable to said valve body, said first coil being disposed at a first side of said valve body and said valve opening;

a first current source connected to said first coil for producing a first current in said first coil;

a second coil which is magnetically couplable to said valve body, said second coil being disposed at a second side of said valve body and said opening opposite to said first side;

a second current source connected to said second coil for producing a second current in said second coil; and

a control unit connected to said first current source and to said second current source for regulating said first current and said second current to magnetically couple at least one of said first and second magnetic coils to said valve body in said opening direction and to magnetically couple at least one of said first and second coils to said valve body in said closing direction.